Battery and cover plate isolation structure thereof

Abstract

The application relates to the technical field of power batteries, and provides a battery and a cover plate isolation structure thereof. The battery cover plate isolation structure comprises a cover plate body and an isolation protection piece; the isolation protection piece comprises an inner lining plate attached to the cover plate body along the length direction of the battery and a protection plate connected to one end of the inner lining plate through a bendable connecting part; the bendable connecting part is bent, the protection plate can be buckled on the side of the inner lining plate away from the cover plate body, and the protection plate can be clamped and fixed on the cover plate body; the inner lining plate is provided with a pole post via hole for a pole post on the cover plate body to pass through, and a protection cavity is formed on the protection plate; a tab led out by a pole group can be arranged in an isolation space formed between the protection plate and the inner lining plate to be welded with the bottom of the pole post, and the protection cavity is arranged corresponding to the welding position of the pole post and the tab. The battery cover plate isolation structure can prevent welding slag from falling into the pole group or the welding protrusion from piercing the pole group, so that reliable isolation protection is formed between the cover plate body and the pole group.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery and its cover plate isolation structure. 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, this application aims to provide a battery cover isolation structure so as to form a reliable isolation and protection between the cover body and the electrode assembly.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery cover plate isolation structure includes a cover plate body and an isolation protective component; the isolation protective component includes an inner liner plate attached to the cover plate body along the length direction of the battery, and a protective plate connected to one end of the inner liner plate via a bendable connecting portion; by bending the connecting portion, the protective plate can be fastened to the side of the inner liner plate opposite to the cover plate body, and the protective plate can be snapped and fixed to the cover plate body; the inner liner plate is provided with a terminal post through hole for the terminal post on the cover plate body to pass through, and a protective cavity is formed on the protective plate; a terminal tab led out from the terminal group can be inserted into the isolation space formed between the protective plate and the inner liner plate to be welded to the bottom of the terminal post, and the protective cavity is provided corresponding to the welding position of the terminal post and the terminal tab.

[0007] Furthermore, the periphery of the electrode through hole is formed with a flange protruding towards the protective plate. When the protective plate is fastened to the inner liner, the electrode tab that passes through the isolation space is pressed against the protective plate by the flange.

[0008] Furthermore, the bottom of the protective cavity protrudes towards the electrode assembly and abuts against the electrode assembly.

[0009] Furthermore, the protective cavity has multiple spacer holes spaced apart on its sidewall, and the cavity wall panel of the protective cavity is connected to the protective plate body by connecting ribs located between the spacer holes.

[0010] Furthermore, the protective plate is provided with a snap-fit ​​post, and a snap-fit ​​groove is provided on the cover plate body corresponding to the snap-fit ​​post; the end of the snap-fit ​​post is provided with a snap head, and when the protective plate is fastened to the inner lining plate, the snap head passes through the inner lining plate and is snapped into the corresponding snap-fit ​​groove.

[0011] Furthermore, the inner lining plate is provided with a through hole for the snap-fit ​​post to pass through, and a boss protruding towards one side of the protective plate is formed at the through hole, and the through hole is opened on the boss; when the protective plate is fastened to the inner lining plate, the boss abuts against the protective plate.

[0012] Furthermore, the cover plate body is provided with an explosion-proof valve mounting hole in the middle, and the inner liner plate is provided with an explosion-proof valve clearance groove corresponding to the explosion-proof valve mounting hole; the protective plate includes a middle connecting section corresponding to the explosion-proof valve clearance groove, and a tab protective section corresponding to the two pole post through holes respectively, and the protective cavity is provided on the tab protective section; a set of snap-fit ​​posts are provided at the position between the middle connecting section and the tab protective section, and at the end of the protective plate away from the connecting part.

[0013] Furthermore, the connecting portion includes a lower extension plate extending from the end of the inner liner plate toward the side where the protective plate is fastened, and a bent plate connecting the end of the lower extension plate and the protective plate, wherein the bent plate is provided with a thinning groove extending through the width direction of the battery.

[0014] Furthermore, the thinning groove is located on the side of the bending plate opposite to the bending direction, the bending position on the bending plate is formed at the bottom of the thinning groove, and the plate thickness at the bending position is between 0.15mm and 0.4mm.

[0015] Compared with related technologies, this application has the following advantages: (1) The battery cover plate isolation structure of this application provides an isolation and protection component on the inner side of the cover plate body. The isolation and protection component is designed as two parts: an inner liner plate and a protective plate that can be snapped together. When assembling the battery, the inner liner plate can be attached to the inner side of the cover plate body first. Then, the tabs led out from the electrode group are welded to the corresponding electrode posts. The connection between the inner liner plate and the protective plate is then bent to snap the protective plate onto the inner liner plate. The protective plate and the cover plate body are fixed together by snapping. At the same time, the inner liner plate is reliably clamped and fixed between the cover plate body and the protective plate. In this way, the inner liner plate can form a reliable insulation isolation between the cover plate body and the tabs. The protective plate covers the welding part between the electrode post and the tabs and isolates the electrode group from the tabs welded to the bottom of the electrode post. This ensures the isolation and protection effect between the welding part and the electrode group and prevents welding slag from falling into the electrode group or welding protrusions from piercing the electrode group. Thus, a reliable isolation and protection is formed between the cover plate body and the electrode group.

[0016] Meanwhile, a protective cavity is set on the protective plate, which can form a relatively spacious space under the pole post to accommodate the welding protrusions of the pole lug and pole post, and can also bear foreign objects such as welding slag formed by welding, preventing foreign objects from entering the pole assembly.

[0017] (2) By setting a flange of suitable height, when the protective plate is fastened to the inner liner, the electrode tabs inserted in the isolation space are pressed firmly onto the protective plate by the flange, preventing the electrode tabs from moving at will and improving the stability of the electrode tab arrangement. This avoids the electrode tabs being pulled on the welded parts of the electrode post due to the positional play of the electrode group relative to the cover plate body, which could cause detachment or open circuit.

[0018] (3) The abutting fit between the protective cavity and the top of the electrode assembly allows the protective cavity to form a good elastic support effect between the electrode assembly and the cover plate body, which can effectively prevent the electrode assembly from moving inside the battery casing during battery vibration.

[0019] (4) By opening spacer holes on the sidewall of the protective cavity, connecting ribs can be formed between the spacer holes, so that the cavity wall of the protective cavity is connected to the plate body of the protective plate only through the aforementioned connecting ribs. With the help of the elastic deformation properties of the connecting ribs, the protective cavity has a better elastic deformation capability, which is conducive to further improving the elastic support effect between the bottom of the protective cavity and the electrode assembly. At the same time, by setting the spacer holes, not only is it helpful to reduce the weight of the isolation protective component, but also when the electrolyte is injected into the electrode assembly through the electrode post through the through hole, the electrolyte can also enter the electrode assembly inside the battery casing through the protective cavity and the spacer holes on its sidewall.

[0020] (5) By setting a slot on the cover plate body and setting a snap-fit ​​post on the protective plate, the snap-fit ​​post can be snapped into the slot after passing through the inner liner plate. The assembly method is convenient and efficient, and can ensure the reliability of the connection between the protective plate and the cover plate body. In turn, the inner liner plate is firmly clamped and fixed to the cover plate body, so that the structural stability of the entire battery cover plate isolation structure is more excellent.

[0021] (6) Based on the need for the snap-fit ​​post to penetrate the inner lining plate, a boss is set at the position where the perforation is made above the inner lining plate, which can improve the structural strength at the perforation position; at the same time, the boss and the protective plate abut against each other, and the height of the boss can limit the height of the isolation space between the inner lining plate and the protective plate, providing good space guarantee for the installation of the electrode tab in the isolation space.

[0022] (7) The protective plate is designed as three parts: a central connecting section and two tab protection sections located on both sides of the central connecting section. The two tab protection sections can respectively cover and protect the bottom of the two pole posts. The protective cavity is then set on the tab protection section, which effectively accommodates the welding part between the bottom of the pole post and the tab. In view of the distribution of the connecting part and the protective cavity on the protective plate, a set of snap-fit ​​posts is set at the free end of the protective plate and at the connection position of the central connecting section and the tab protection section. This ensures that there is a set of connecting structures (connecting part or snap-fit ​​posts) on both sides of the protective cavity, which not only ensures the structural stability of the part where the protective cavity is located, but also facilitates the tab to pass through the isolation space between the inner liner and the protective plate from both sides of the width direction of the protective plate.

[0023] (8) A bendable connecting part is provided between the inner lining plate and the protective plate, so that the entire isolation and protection component is an integral structure with both unfolded and snap-fit ​​states, which is convenient for storage and retrieval. When performing the snap-fit ​​operation of the protective plate on the inner lining plate, the operation can be easily completed by bending the connecting part, so as to achieve accurate snap-fit ​​positioning of the protective plate on the inner lining plate. By providing a thinning groove on the bending plate of the connecting part, the bending operation of the connecting part is made easier, and it is easy to form a bending position at the bottom of the thinning groove.

[0024] (9) The thinning groove is set on the side of the bending plate opposite to the bending. When bending the bending plate, the thinning groove is more likely to deform and crack, so that the bending plate can be folded at the bending position, so that the protective plate can be smoothly fastened to the inner lining plate. Through the thinning groove, the thickness of the plate at the bending position at the bottom of the thinning groove is controlled within a suitable thickness range, ensuring good connection performance and bendability at the bending position.

[0025] Another objective of this application is to provide a battery having the battery cover isolation structure described in this application. The battery of this application possesses the technical advantages of the aforementioned battery cover isolation structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the isolation and protection component described in an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shows the structure of the other side of the isolation and protective component. 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 structure of the isolation and protective component with another configuration structure described in this embodiment of the present invention, assembled on the battery cover plate; Figure 6 for Figure 5 The diagram shows the structure of the isolation and protective components 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 shown is a structural schematic of the battery after the battery cover assembly and electrode assembly are completed. Figure 10 for Figure 7 The diagram shown is a structural schematic of the battery after the battery cover, insulating protective 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; Explanation of reference numerals in the attached figures: 1. Cover plate body; 10. Pole post; 11. Insulating sleeve; 12. Explosion-proof valve mounting hole; 13. Slot; 2. Electrode group; 20. Electrode ear; 3. Connecting part; 30. Lower extension plate; 31. Bending plate; 310. Thinning groove; 311. Bending slope; 312. Bending position; 4. Inner liner plate; 40. Through hole for pole post; 41. Flange; 42. Boss; 420. Perforation; 421. Chamfer; 43. Explosion-proof valve clearance groove; 430. Vent hole; 5. Protective plate; 50. Middle connecting section; 500. Through hole; 51. Electrode protection section; 52. Protective cavity; 520. Connecting rib; 521. Spacing hole; 53. Snap-fit ​​post; 530. Clip head. 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 battery 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 battery's vertical direction (also known as the height direction), horizontal direction (also known as the width direction), and front-back direction (also known as the length direction). At the same time, the length, width, and height directions of the cover body, protective plate, and inner lining plate of the isolation protective component are also consistent with those of the battery. Specifically, as shown in the accompanying drawings, the X direction is the battery's front-back direction (length direction), the Y direction is the battery's horizontal direction (width direction), and the Z direction is the battery's vertical direction (height direction).

[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 application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0033] The first aspect of this application provides a battery cover isolation structure, which is applied in scenarios such as the protection and insulation of the electrode group 2 and the cover body 1 in a battery; and, the isolation protection component of this embodiment, by utilizing its innovative structural design, can form a reliable isolation protection between the electrode group 2 and the terminal post 10 of 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 isolation and protective component, one exemplary structure of which is as follows: Figure 1 , Figure 2 and Figure 3 As shown.

[0036] Overall, the battery cover isolation structure includes a cover body 1 and an isolation protective component. The isolation protective component includes an inner liner 4 attached to the cover body 1 along the length of the battery, and a protective plate 5 connected to one end of the inner liner 4 via a bendable connecting part 3. Furthermore, by bending the connecting part 3, the protective plate 5 can be fastened to the side of the inner liner 4 facing away from the cover body 1, and the protective plate 5 can be snapped and fixed to the cover body 1. The inner liner 4 has a terminal through-hole 40 for the terminal post 10 on the cover body 1 to pass through, and a protective cavity 52 is formed on the protective plate 5. A tab 20 leading from the electrode assembly 2 can pass through the isolation space formed between the protective plate 5 and the inner liner 4 to be welded to the bottom of the terminal post 10. The protective cavity 52 is provided corresponding to the welding position of the terminal post 10 and the tab 20.

[0037] Based on the above overall design concept, by setting an isolation and protective component on the inner side of the cover body 1, and designing the isolation and protective component as two parts, an inner liner 4 and a protective plate 5, which can be snapped together, when assembling the battery, the inner liner 4 can be first attached to the inner side of the cover body 1, then the electrode tabs 20 led out from the electrode group 2 can be welded to the corresponding electrode posts 10, and then the connection between the inner liner 4 and the protective plate 5 can be bent to snap the protective plate 5 onto the inner liner 4. The protective plate 5 and the cover body 1 are fixed together by snapping, while the inner liner 4... It is reliably clamped and fixed between the cover plate body 1 and the protective plate 5; in this way, the inner liner plate 4 can form a reliable insulating isolation between the cover plate body 1 and the electrode ear 20, while the protective plate 5 covers the welding part between the electrode post 10 and the electrode ear 20 and isolates the electrode group 2 from the electrode ear 20 welded to the bottom of the electrode post 10, ensuring the isolation and protection effect between the welding part and the electrode group 2, preventing welding slag from falling into the electrode group 2 or the welding protrusion from piercing the electrode group 2, thereby forming a reliable isolation and protection between the cover plate body 1 and the electrode group 2.

[0038] It should be noted that, based on the above-mentioned 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 inner lining plate 4 and the protective plate 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 various methods such as thinning and opening holes. The specific arrangement sequence and assembly method of the isolation and protective components on the cover plate body 1, and the fastening and fixing of the protective plate 5 on the inner lining plate 4, can also be flexibly adjusted. For the parts required for the implementation of the overall solution but not involved in the above overall setup, reasonable and flexible designs can be made by referring to mature setting 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 above-mentioned combinations and variations. 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 above-mentioned combinations and variations, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this utility model.

[0039] Specifically, such as Figure 2 , Figure 3 , Figure 4As shown, in some preferred exemplary embodiments, the periphery of the electrode through-hole 40 is formed with a flange 41 protruding towards the protective plate 5. When the protective plate 5 is fastened to the inner liner 4, the electrode lug 20 passing through the isolation space is pressed against the protective plate 5 by the flange 41. By setting the flange 41 to a suitable height, when the protective plate 5 is fastened to the inner liner 4, the electrode lug 20 passing through the isolation space is pressed against the protective plate 5 by the flange 41, preventing the electrode lug 20 from moving freely and improving the stability of the electrode lug 20's arrangement position. This also prevents the electrode lug 20 from being pulled against the welded part of the electrode post 10 due to positional play of the electrode assembly 2 relative to the cover plate body 1, which could cause detachment or open circuit.

[0040] Continue as Figure 5 , Figure 6 As shown, in this embodiment, a protective cavity 52 is formed on the protective plate 5 corresponding to the through hole 40 of the electrode post. The protective cavity 52 is positioned directly opposite the welding area of ​​the electrode post 10 and the tab 20. When the battery cover isolation structure is provided on the battery casing, the bottom of the protective cavity 52 protrudes towards the electrode assembly 2 and abuts against the electrode assembly 2. The protective cavity 52 on the protective plate 5 can form a relatively spacious space below the electrode post 10 to accommodate the welding protrusion of the tab 20 and the electrode post 10. It can also bear foreign objects such as welding slag formed during welding, preventing foreign objects from entering the electrode assembly 2. Furthermore, the abutting fit between the protective cavity 52 and the top of the electrode assembly 2 allows the protective cavity 52 to form a good elastic support effect between the electrode assembly 2 and the cover body 1, which can effectively prevent the electrode assembly 2 from moving inside the battery casing during battery vibration.

[0041] Specifically, in this embodiment, the protective cavity 52 has multiple spacer holes 521 spaced apart on its sidewalls. The cavity wall of the protective cavity 52 is connected to the protective plate 5 via connecting ribs 520 located between the spacer holes 521. By opening spacer holes 521 on the sidewalls at both ends of the protective cavity 52 along its length, connecting ribs 520 can be formed between the spacer holes 521. This allows the cavity wall of the protective cavity 52 to be connected to the protective plate 5 via the connecting ribs 520. Utilizing the elastic deformation properties of the connecting ribs 520, the protective cavity 52 possesses better elastic deformation capabilities, which is beneficial for further improving the elastic support effect between the bottom of the protective cavity 52 and the electrode assembly 2. Simultaneously, the spacer holes 521 not only help reduce the weight of the isolation and protective components, but also allow the electrolyte to enter the electrode assembly 2 inside the battery casing through the protective cavity 52 and the spacer holes 521 on its sidewalls when electrolyte is injected into the electrode assembly 2 via the electrode post through-hole 40.

[0042] Of course, the protective cavity 52 can be reasonably set according to the number of pole posts 10 and pole tabs 20; preferably, for each pole post 10, two protective cavities 52 can be set at intervals on the protective plate 5 along the width direction of the protective plate 5.

[0043] In addition, combined Figures 7 to 11 As shown, in some preferred exemplary embodiments, a gap is left between the spacer hole 521 on the sidewall of the protective cavity 52 and the bottom of the protective cavity 52. ​​By maintaining a certain gap between the bottom of the protective cavity 52 and the spacer hole 521, the protective cavity 52 has a certain net depth h, which reduces the risk of welding slag, foreign objects, etc. in the protective cavity 52 falling into the electrode group 2 through the spacer hole 521.

[0044] Regarding the specific arrangement 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 inner lining plate 4 can be made in the connecting part 3. In this way, when the connecting part 3 is bent, the position of the elongated hole can be bent smoothly, thereby allowing the protective plate 5 to be smoothly fastened onto the inner lining plate 4. However, in this embodiment, as... Figure 3 and Figure 4 As shown, the inner liner plate 4 and the protective plate 5 are connected by a bendable connecting part 3. The connecting part 3 includes a lower extension plate 30 extending from the end of the inner liner plate 4 toward the side where the protective plate 5 is fastened, and a bent plate 31 connecting the end of the lower extension plate 30 and the protective plate 5. The bent plate 31 has a thinning groove 310 extending through the width of the inner liner plate 4. The bendable connecting part 3 between the inner liner plate 4 and the protective plate 5 makes the entire isolation and protection component a single structure with both unfolded and fastened states, facilitating storage and retrieval. When fastening the protective plate 5 onto the inner liner plate 4, the operation can be conveniently completed through the bent connecting part 3, achieving accurate fastening and positioning of the protective plate 5 onto the inner liner plate 4. In use, the protective plate 5 is unfolded from the inner liner plate 4 to facilitate the welding of the tab 20 and the post 10. After welding, the protective plate 5 is fastened onto the inner liner plate 4 to complete the assembly of the battery cover isolation structure at the top opening of the battery casing. By providing a thinning groove 310 on the bending plate 31 of the connecting part 3, the bending operation of the connecting part 3 is made easier, and a bending position 312 that is easy to bend is formed at the bottom of the thinning groove 310.

[0045] For the specific arrangement of the connecting part 3, there are naturally many different structural schemes to choose from; for example, the thinning groove 310 can adopt different shapes, depths, and placement positions. In this embodiment, such as Figure 4As shown, in some preferred exemplary embodiments, the thinning groove 310 is located on the side of the bent plate 31 opposite to the bending direction, and the bending position 312 on the bent plate 31 is formed at the bottom of the thinning groove 310. The plate thickness T at the bending position 312 is between 0.15mm and 0.4mm. By placing the thinning groove 310 on the side of the bent plate 31 opposite to the bending direction, the thinning groove 310 is more likely to deform and crack when the bent plate 31 is bent, thereby completing the folding operation of the bent plate 31 at the bending position 312, so that the protective plate 5 can be smoothly fastened to the inner lining plate 4. Through the thinning groove 310, the plate thickness at the bending position 312 at the bottom of the thinning groove 310 is controlled within a suitable thickness range, ensuring good connection performance and bendability at the bending position 312.

[0046] Based on the above configuration, the connecting part 3 may preferably adopt the following specific structural scheme.

[0047] The thinning groove 310 is a groove with an inverted triangular cross-section. A bending position 312 is formed at the bottom of the thinning groove 310. The width dimension W1 between the bending position 312 and the lower extension plate 30 is set to 0.3mm-4.5mm, and the width dimension W2 between the bending position 312 and the protective plate 5 is set to 0.35mm-4.8mm. This ensures a smooth transition in the bending area after the connecting part 3 is bent, stabilizes the product manufacturing process, and prevents defects such as shrinkage from reducing the reliability of the product.

[0048] The thickness t of the lower extension plate 30 is set to 0.6mm-2.8mm to ensure the connection strength of the product and prevent the tab 20 from collapsing due to deformation of the isolation protective component during bending and after bending. The thickness T1 of the protective plate 5 connected to the connecting part 3 is set between 0.5mm-1.8mm to ensure the strength of the protective plate 5, so that the tab 20 can be firmly fixed in the defined position in the isolation space. The height H of the lower extension plate 30 is set to 2.0mm-8mm, and preferably the net height of the lower extension plate 30 (i.e., height H minus the thickness of the inner lining plate 4) is kept consistent with the height of the boss 42 described below, so that it can jointly define the height dimension of the isolation space with the boss 42; in this way, the isolation space can provide a reasonable height space for the tab 20 to pass through in the isolation space. In this case, a flange 41 protruding towards the protective plate 5 can be provided at the edge of the pole hole 40 on the inner liner plate 4. The flange 41 is used to press the pole tab 20 against the protective plate 5, making the position of the pole tab 20 more stable.

[0049] In addition, as before Figure 4As shown, there is a height difference between the bottom of the lower extension plate 30 and the lower surface of the protective plate 5. Specifically, taking the bending position 312 as the boundary, the height difference H1 between the bending position 312 and the lower surface of the protective plate 5, and the height difference H2 between the bending position 312 and the bottom of the lower extension plate 30, are preferably set to 0.2mm-3.2mm. This ensures that after bending the plate 31, the bending slopes 311 on both sides of the bending position 312 are tightly fitted together, and the end of the protective plate 5 overlaps the bottom of the lower extension plate 30. This provides good support for the end of the protective plate 5 from the lower extension plate 30, ensuring the connection strength between the protective plate 5 and the connecting part 3, and fully guaranteeing the compaction and fixation of the electrode lug 20 between the protective plate 5 and the inner lining plate 4.

[0050] Continue as Figures 6 to 11 As shown, in some preferred exemplary embodiments, the protective plate 5 of this embodiment is provided with a snap-fit ​​post 53, and a snap-fit ​​groove 13 is provided on the cover plate body 1 corresponding to the snap-fit ​​post 53. The end of the snap-fit ​​post 53 is provided with a snap head 530. When the protective plate 5 is fastened to the inner liner plate 4, the snap head 530 passes through the inner liner plate 4 and is snapped into the corresponding snap groove 13. By providing a snap groove 13 on the cover plate body 1 and a snap-fit ​​post 53 on the protective plate 5, the snap-fit ​​post 53 can pass through the inner liner plate 4 and snap its snap head 530 into the snap groove 13. The assembly method is convenient and efficient, and can ensure the reliability of the connection between the protective plate 5 and the cover plate body 1. In addition, the inner liner plate 4 is also firmly clamped and fixed to the cover plate body 1, so that the structural stability of the entire battery cover isolation structure is better.

[0051] Furthermore, in some preferred exemplary embodiments, the inner liner plate 4 of this embodiment has a through hole 420 for the snap-fit ​​post 53 to pass through, and a boss 42 protruding towards the protective plate 5 is formed at the through hole 420. The through hole 420 is formed on the boss 42. When the protective plate 5 is fastened to the inner liner plate 4, the boss 42 abuts against the protective plate 5. Based on the need for the snap-fit ​​post 53 to pass through the inner liner plate 4, the boss 42 is provided at the position where the through hole 420 is opened above the inner liner plate 4, which can improve the structural strength at the position of the through hole 420. At the same time, the boss 42 abuts against the protective plate 5, and the height of the boss 42 and the aforementioned lower extension plate 30 can limit the height of the isolation space between the inner liner plate 4 and the protective plate 5, providing good space guarantee for the insertion of the tab 20 in the isolation space. In addition, a chamfer 421 can be provided at the end of the through hole 420 to facilitate the snap-fit ​​post 53 to be smoothly inserted into the through hole 420.

[0052] In practical applications, the cover plate body 1 typically has two poles 10 spaced apart. An insulating sleeve 11 is fitted over the pole 10, forming an insulating barrier between the pole 10 and the cover plate body 1. An explosion-proof valve is installed between the two poles 10. Therefore, in this embodiment, an explosion-proof valve mounting hole 12 is provided in the middle of the cover plate body 1. Corresponding to the explosion-proof valve mounting hole 12, an explosion-proof valve clearance groove 43 is provided on the inner liner plate 4, 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 plate 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, a flange 41 is provided around the perimeter of the pole hole 40, with a slot or similar structure on the flange 41, and a corresponding locking protrusion is provided on the cover plate body 1, to better position and install the inner liner plate 4 when it is attached to the cover plate body 1.

[0053] Continue as Figure 5 , Figure 6 As shown, in some preferred exemplary embodiments, the cover plate body 1 is provided with an explosion-proof valve mounting hole 12 in the middle, and the inner liner plate 4 is provided with an explosion-proof valve clearance groove 43 corresponding to the explosion-proof valve mounting hole 12; the protective plate 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 post through holes 40 respectively, and a protective cavity 52 is provided on the tab protection section 51; a set of snap-fit ​​posts 53 are 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 plate 5 away from the connecting part 3.

[0054] The protective plate 5 is designed with three parts: a central connecting section 50 and two tab protection sections 51 located on either side of the central connecting section 50. The two tab protection sections 51 can respectively cover and protect the bottom of the two pole posts 10. The protective cavity 52 is then placed on the tab protection section 51, which effectively accommodates the welding part between the bottom of the pole post 10 and the tab 20. Regarding the distribution of the connecting part 3 and the protective cavity 52 on the protective plate 5, a set of snap-fit ​​posts 53 is provided at the free end of the protective plate 5 and at the connection position between the central connecting section 50 and the tab protection section 51. This ensures that there is a connection structure (connecting part 3 or snap-fit ​​post 53) on both sides of the protective cavity 52, guaranteeing the structural stability of the area where the protective cavity 52 is located and facilitating the tab 20 to pass through from both sides of the width direction of the protective plate 5 into the isolation space between the inner liner plate 4 and the protective plate 5.

[0055] In summary, the battery cover isolation structure of this embodiment, by providing an isolation and protective component on the inner side of the cover body 1, and designing the isolation and protective component as two parts, an inner liner 4 and a protective plate 5, which can be snapped together, allows for battery assembly. First, the inner liner 4 is attached to the inner side of the cover body 1. Then, the tabs 20 leading from the electrode group 2 are welded to the corresponding terminals 10. Next, the connection between the inner liner 4 and the protective plate 5 is bent to snap the protective plate 5 onto the inner liner 4. The protective plate 5 and the cover body 1 are thus fixed together via a snap-fit ​​mechanism, simultaneously ensuring the inner liner 4 is properly seated. The liner 4 is reliably clamped and fixed between the cover plate body 1 and the protective plate 5. In this way, the inner liner 4 can form a reliable insulating barrier between the cover plate body 1 and the electrode lug 20, while the protective plate 5 covers the welding area between the electrode post 10 and the electrode lug 20 and isolates the electrode group 2 from the electrode lug 20 welded to the bottom of the electrode post 10. This ensures the isolation and protection effect between the welding area 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 reliable isolation and protection between the cover plate body 1 and the electrode group 2.

[0056] A second aspect of this utility model provides a battery, which includes the isolation and protective component provided in the first aspect; an exemplary structure of the battery is as follows: Figures 7 to 11 As shown.

[0057] When using the battery cover isolation structure of Embodiment 1, after the welding of the tabs 20 and the fastening and fixing of the protective plate 5 to the inner liner plate 4 are completed, the overall cross-sectional structure of the battery is as follows: Figure 10 and Figure 11 As shown, due to the thinning groove 310, the connecting part 3 is folded at the bending part located at the bottom of the thinning groove 310. After folding, the bending plates 31 on both sides of the bending part are attached together. Due to the presence of the lower extension plate 30 and the boss 42 at the hot-melt structure, the isolation space for accommodating the electrode tab 20 between the inner liner plate 4 and the protective plate 5 is well defined, and the height of the isolation space is consistent with the net height of the lower extension plate 30 and the height of the boss 42. In the specific dimensional settings of the hot-melt structure in this embodiment, the net height of the boss 42 is 0.8mm-3.2mm, and the net height of the lower extension plate 30 at the connecting part 3 is also set to 0.8mm-3.2mm. After the protective plate 5 is fastened to the inner liner plate 4, it can be ensured that the protective plate 5 presses the electrode tab 20 tightly.

[0058] like Figure 11As shown, the protective plate 5 has a protective cavity 52 located directly below the tab 20. Multiple spacer holes 521 are spaced apart at intervals on the top of the sidewall of the protective cavity 52. ​​The spacing between the spacer holes 521 and the bottom of the protective cavity 52, i.e., the net depth h of the protective cavity 52, can be flexibly set within a reasonable range. Preferably, the total depth of the protective cavity 52 can be set between 1.5mm and 8.5mm, such as 1.5mm, 4mm, 6mm, 8.5mm, etc. A reasonable depth of the protective cavity 52 can better accommodate protrusions or weld slag at the welding points of the 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 h of the protective cavity 52 can be set between 0.3mm and 8mm, such as 0.3mm, 4mm, 6mm, 8mm, etc.

[0059] like Figure 11 As shown, after the protective plate 5 is fastened, the snap-fit ​​post 53 passes through the through hole 420, and the snap-fit ​​head 530 of the snap-fit ​​post 53 is heat-fused and fixed to the snap-fit ​​groove 13 on the cover plate body 1. The snap-fit ​​groove 13 can adopt a structure with a larger internal size, making it more difficult for the snap-fit ​​post 53 to come out of the snap-fit ​​groove 13. By heating, the snap-fit ​​head 530 is melted, and then the melted snap-fit ​​head 530 is pressed into the snap-fit ​​groove 13. Due to the deformation caused by heat pressure, the radial dimension of the snap-fit ​​head 530 increases, completely filling the entire snap-fit ​​groove 13, thereby effectively preventing the snap-fit ​​post 53 from detaching from the cover plate body 1, making the heat-fused connection firm and reliable.

[0060] This solution incorporates a novel battery cover isolation structure, adding a protective plate 5. The protective plate 5 is securely fastened to the inner liner plate 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 plate 5 and the inner liner plate 4, ensuring the consistency of the tab 20 after bending and preventing the risk of the tab 20 and the terminal post 10 being inserted backwards into the electrode group 2, thus improving the safety of the product.

[0061] 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 isolation structure, characterized in that: The device includes a cover body (1) and an isolation and protective component; the isolation and protective component includes an inner liner (4) attached to the cover body (1) along the length of the battery, and a protective plate (5) connected to one end of the inner liner (4) via a bendable connecting part (3); by bending the connecting part (3), the protective plate (5) can be fastened to the side of the inner liner (4) facing away from the cover body (1), and the protective plate (5) can be snapped and fixed on the cover body (1); The inner liner plate (4) is provided with a pole through hole (40) for the pole (10) on the cover plate body (1) to pass through, and a protective cavity (52) is formed on the protective plate (5); the pole lug (20) led out from the pole group (2) can be inserted into the isolation space formed between the protective plate (5) and the inner liner plate (4) to be welded to the bottom of the pole (10), and the protective cavity (52) is provided corresponding to the welding part of the pole (10) and the pole lug (20).

2. The battery cover isolation structure according to claim 1, characterized in that: The periphery of the pole through hole (40) is formed with a flange (41) protruding towards the protective plate (5). When the protective plate (5) is fastened to the inner liner (4), the pole lug (20) passing through the isolation space is pressed onto the protective plate (5) by the flange (41).

3. The battery cover isolation structure according to claim 1, characterized in that: The bottom of the protective cavity (52) protrudes toward the pole group (2) and abuts against the pole group (2).

4. The battery cover isolation structure according to claim 3, characterized in that: The protective cavity (52) has a plurality of spacer holes (521) spaced apart on its side wall. The cavity wall panel of the protective cavity (52) is connected to the plate body of the protective plate (5) by connecting ribs (520) located between the spacer holes (521).

5. The battery cover isolation structure according to claim 1, characterized in that: The protective plate (5) is provided with a snap-fit ​​post (53), and a slot (13) is provided on the cover plate body (1) corresponding to the snap-fit ​​post (53); the end of the snap-fit ​​post (53) is provided with a snap head (530), and when the protective plate (5) is fastened to the inner lining plate (4), the snap head (530) passes through the inner lining plate (4) and is snapped into the corresponding slot (13).

6. The battery cover isolation structure according to claim 5, characterized in that: The inner lining plate (4) is provided with a through hole (420) through which the snap-fit ​​post (53) passes, and a boss (42) protruding towards the side of the protective plate (5) is formed at the through hole (420). The through hole (420) is opened on the boss (42). When the protective plate (5) is fastened to the inner lining plate (4), the boss (42) abuts against the protective plate (5).

7. The battery cover isolation structure according to claim 5, characterized in that: The cover plate body (1) is provided with an explosion-proof valve mounting hole (12) in the middle, and the inner lining plate (4) is provided with an explosion-proof valve clearance groove (43) corresponding to the explosion-proof valve mounting hole (12). The protective plate (5) includes a middle connecting section (50) corresponding to the explosion-proof valve relief groove (43) and a tab protection section (51) corresponding to the two pole through holes (40) respectively. The protective cavity (52) is provided on the tab protection section (51). A set of snap-fit ​​posts (53) are provided at the position between the middle connecting section (50) and the tab protection section (51) and at the end position of the protective plate (5) away from the connecting part (3).

8. The battery cover isolation structure according to any one of claims 1 to 7, characterized in that: The connecting part (3) includes a lower extension plate (30) extending from the end of the inner liner plate (4) toward the side where it is fastened to the protective plate (5), and a bent plate (31) connecting the end of the lower extension plate (30) and the protective plate (5), and the bent plate (31) is provided with a thinning groove (310) that runs through the width direction of the battery.

9. The battery cover isolation structure according to claim 8, characterized in that: The thinning groove (310) is located on the side of the bending plate (31) opposite to the bending direction. The bending position (312) on the bending plate (31) is formed at the bottom of the thinning groove (310). The plate thickness T of the bending position (312) is between 0.15mm and 0.4mm.

10. A battery, characterized in that: The battery is provided with a battery cover isolation structure as described in any one of claims 1 to 9.

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