Battery cover plate assembly and battery

Abstract

The utility model relates to new energy battery technical field, concretely provides a battery cover plate assembly and battery, the battery cover plate assembly of the utility model includes the cover plate body, and is located at the insulating piece of the cover plate body one side to pole group, wherein, the insulating piece includes the cover plate gasket and the protective pad of integrative connection, the cover plate gasket is attached to the cover plate body, the protective pad is reversibly connected in the one side of cover plate gasket width direction, and has the buckling state of buckling in the side of cover plate gasket opposite to the cover plate body, the hot melt connecting portion is equipped on the protective pad, and the hot melt portion is correspondingly provided on the cover plate gasket, under the buckling state, the hot melt connecting portion can hot melt solid connection on the hot melt portion, and make the protective pad form the isolation between the welding part of pole post and pole group, the battery cover plate assembly of the utility model guarantees the buckling connection reliability of protective pad on the cover plate gasket, thereby can form the firm and reliable isolation protection to the welding part of the pole lug and pole post of battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery cover assembly. Additionally, this utility model also relates to a battery. Background Technology

[0002] With the development of new energy technologies, lithium-ion batteries, as a typical example, are widely used in new energy vehicles due to their excellent energy storage and safety.

[0003] During battery manufacturing, the electrode assembly located inside the battery casing needs to have tabs extended from it. These tabs, of the same polarity, are then welded to terminals on the cover plate to establish electrical connection between the battery and external electrical components. The welding of the tabs to the terminals is one of the key processes in battery production, and its quality directly affects the battery's safety and reliability.

[0004] In an electrode assembly, the separator is a crucial component for isolating the positive and negative electrodes. If there are protrusions or fallen weld slag at the welding points of the tabs and terminals, these could puncture the electrode assembly, posing a significant risk to the safe operation of the separator and electrodes. For example, if the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, creating a short circuit. The high temperatures generated by this short circuit can trigger a chain reaction inside the battery, leading to electrolyte decomposition, electrode material decomposition, and ultimately thermal runaway. Thermal runaway can not only damage the battery but also threaten the safety of the vehicle, personnel, and the surrounding environment. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery cover assembly to provide a solid isolation and protection for the welding parts of the battery's tabs and terminals.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery cover assembly includes a cover body and an insulating member disposed on the side of the cover body facing the electrode assembly; the insulating member includes an integrally connected cover gasket and a protective gasket, the cover gasket being attached to the cover body and having an electrode post through hole for the electrode post on the cover body to pass through; the protective gasket is rotatably connected to one side of the cover gasket in the width direction and has a fastened state fastened to the side of the cover gasket facing away from the cover body; The protective pad is provided with a heat-fusion connection part, and the cover plate liner is correspondingly provided with a heat-fusion part; in the fastened state, the heat-fusion connection part can be heat-fused and fixed to the heat-fusion part, so that the protective pad forms an isolation between the welding part of the pole post and the pole group.

[0007] Furthermore, along the length of the cover plate body, two pole posts are spaced apart on the cover plate body, and two pole post through holes are provided corresponding to the pole posts; the protective pad has pole post protective sections corresponding to the two pole post through holes, and a middle connecting section connecting the two pole post protective sections.

[0008] Furthermore, the pole protection section includes a central region directly opposite the pole through hole, and an outer extension region surrounding the central region; the hot-melt connection portion is disposed in the outer extension region.

[0009] Furthermore, the pole protection section is connected to the cover plate liner by a bendable connecting rib, and the outer extension area is provided with two heat-fusion connection parts at intervals; both heat-fusion connection parts are provided at the end of the pole protection section away from the connecting rib, and a channel is formed between the two heat-fusion connection parts for the pole tab to pass through to the middle area.

[0010] Furthermore, a protrusion is formed around the through hole of the pole post on the side of the cover plate gasket facing the protective pad; in the fastened state, the pole lug that passes between the cover plate gasket and the pole post protective section is clamped between the protrusion and the pole post protective section.

[0011] Furthermore, a slag receiving groove is formed in the central region, and the slag receiving groove is provided corresponding to the welding part of the pole post; holes are opened on the side wall of the slag receiving groove, and there is a gap between the holes and the bottom of the slag receiving groove.

[0012] Furthermore, the cover plate body between the two pole posts is provided with an explosion-proof valve mounting hole, and a through hole is provided on the cover plate gasket corresponding to the explosion-proof valve mounting hole, and a through hole is provided on the middle connecting section.

[0013] Furthermore, the insulating component is integrally injection molded from plastic material.

[0014] Furthermore, the protective pad is provided with a boss, and the hot-melt connection part includes a hot-melt hole provided on the boss. The hot-melt part includes a hot-melt column provided on the cover plate liner. The hot-melt column is inserted and hot-melt fixed in the hot-melt hole.

[0015] Compared with the prior art, this utility model has the following advantages: (1) The battery cover assembly of this utility model has a bendable insulating component on the cover body. The protective pad on the insulating component has a snap-fit ​​state that can be snapped onto the cover liner, and also has an unfolded state that is at a certain angle to the cover liner. In the unfolded state, the tabs led out from the electrode group can be welded onto the electrode post. Then the protective pad is snapped into the snap-fit ​​state. The cover liner can form a reliable insulating isolation between the cover body and the tabs. The protective pad covers the welding part between the electrode post and the tabs, ensuring the isolation and protection effect between the welding part and the electrode group. It can prevent welding slag from falling into the electrode group or the welding protrusion from piercing the electrode group. The cover liner and the protective pad are connected by heat fusion, which ensures the reliability of the snap-fit ​​connection of the protective pad on the cover liner. Thus, it can form a stable and reliable isolation and protection for the welding part of the battery tabs and electrode post.

[0016] (2) Two poles are spaced apart on the cover plate body, which is compatible with the case where most batteries are usually configured with two poles, positive and negative; correspondingly, two pole through holes are provided on the cover plate liner, which can allow the bottom of the two poles to pass through the inner side of the cover plate liner respectively; furthermore, the protective pad is set as a middle connecting section and pole protection sections located on both sides of the middle connecting section. The two pole protection sections can respectively cover and protect the welding parts at the bottom of the two poles, and the middle connecting section can form a good connection between the two pole protection sections.

[0017] (3) The pole protection section is divided into two parts: the middle area and the outer extension area. When the middle area is directly opposite the pole through hole, the outer extension area can extend to the outer edge of the pole through hole, thus more reliably covering the welding part of the pole and the electrode ear; and the hot melt connection part is set in the outer extension area, which can avoid the hot melt connection part and the hot melt part from interfering with the pole, electrode ear, etc., and provides good space conditions for the electrode ear to pass between the cover plate gasket and the protective gasket.

[0018] (4) A bendable connecting rib is provided between each pole protection section and the cover gasket. This not only ensures the integral structure of the protective pad and the cover gasket, but also allows the protective pad to be accurately fastened to the cover gasket by bending the connecting rib after the electrode lug and pole are welded. For each pole protection section, two hot-melt connection parts are provided at intervals, and both hot-melt connection parts are located on the side of the pole protection section away from the connecting rib. After the hot-melt connection parts are fixed to the corresponding hot-melt parts, the two hot-melt connection points, together with the connecting rib, will form a triangular three-point connection, which can greatly improve the connection reliability between the pole protection section and the cover gasket, and further improve the stability and reliability of the isolation space formed between the cover gasket and the pole protection section for the connection of the electrode lug and pole.

[0019] (5) A ring-shaped protrusion is provided at the edge of the pole hole on the cover plate liner. After the protective pad is fastened to the cover plate liner, the gap between the pole protection section and the protrusion is just enough for the pole ear to pass through. The protrusion and the pole protection section can better clamp and fix the pole ear that passes through them in the vertical direction.

[0020] (6) A slag receiving groove is set in the middle area of ​​the pole protection section, which can form a relatively spacious space under the pole to accommodate the welding protrusion of the pole lug and the pole, and can also receive foreign objects such as welding slag formed by welding, preventing foreign objects from entering the pole assembly.

[0021] (7) An explosion-proof valve mounting hole is provided in the middle position between the two poles on the cover plate body, providing good installation conditions for the explosion-proof valve on the cover plate body. Corresponding to the explosion-proof valve mounting hole on the cover plate body, a through hole is provided on the cover plate gasket, and a through hole is provided on the middle connecting section between the two pole protection sections, forming a smooth exhaust channel between the pole group and the explosion-proof valve; once an abnormal situation such as a short circuit occurs inside the battery, the generated high-pressure gas can be smoothly discharged to the outside of the battery through the through hole, the through hole and the explosion-proof valve, which can effectively reduce the risk caused by battery abnormality.

[0022] (8) The plastic integral injection molding process of the insulating parts not only has good insulation and isolation performance, but also has mature and reliable processing technology; furthermore, the cover gasket and protective gasket are designed as sheet, which not only ensures the isolation performance of the insulating parts, but also has the advantages of saving raw materials and reducing the space occupied by the insulating parts inside the battery.

[0023] (9) By setting a boss on the protective pad and setting the hot melt connection part in the form of a hot melt hole on the boss, when the hot melt column on the cover plate liner is inserted into the hot melt hole, the hot melt column can be heated and hot melted to be fixed to the hot melt hole; at the same time, since the boss is clamped between the cover plate liner and the pole protection section, by reasonably setting the height of the boss, a suitable gap height between the cover plate liner and the pole protection section can be defined, thereby providing a suitable gap height dimension for the installation of the pole tab.

[0024] Another objective of this invention is to provide a battery having the battery cover assembly described herein. The battery of this invention possesses the technical advantages of the aforementioned battery cover assembly. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this utility model. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the insulating component described in this embodiment of the utility model; Figure 2 This is a schematic diagram of the structure of the other side of the insulating component described in this embodiment of the utility model; Figure 3 This is a schematic diagram of the overall structure of the battery cover assembly described in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the other side of the battery cover assembly described in this embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the insulating component with a slag receiving groove on the pole protection section according to an embodiment of the present utility model; Figure 6 for Figure 5 A magnified view of the area shown in section A; Figure 7 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 8 for Figure 7 The front view of the battery shown; Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure of the part shown in BB; Figure 10 This is a three-dimensional structural diagram of the battery described in this embodiment of the present invention, showing the battery cover assembly being fastened to the battery casing. Figure 11 for Figure 10 A schematic diagram of the cross-sectional structure of the part shown in CC.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate body; 10. Pole post; 11. Insulating sleeve; 12. Explosion-proof valve mounting hole; 2. Battery casing; 3. Electrode assembly; 30. Electrode tabs; 4. Cover gasket; 40. Pole post through hole; 41. Protrusion; 42. Hot melt column; 43. Through hole; 5. Protective pad; 50. Pole post protective section; 500. Central area; 501. Outer area; 502. Slag receiving groove; 503. Hole; 504. Boss; 505. Hot melt hole; 51. Central connecting section; 510. Through hole; 6. Connecting reinforcement bars. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] In the description of this utility model, it should be stated 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. 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). Specifically, as shown in the accompanying drawings, the X direction is the length direction of the battery, and the Y direction is the width direction of the battery.

[0029] 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.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1 This embodiment relates to a battery cover assembly for sealing the top opening of the battery casing 2, thereby providing robust isolation and protection for the welded joints of the battery tabs 30 and terminals 10; one exemplary structure is as follows: Figure 1 , Figure 2 and Figure 3 As shown.

[0032] Overall, the battery cover assembly includes a cover body 1 and an insulating component disposed on the side of the cover body 1 facing the electrode assembly 3. The insulating component includes an integrally connected cover gasket 4 and a protective pad 5. The cover gasket 4 is attached to the cover body 1 and has an electrode post through-hole 40 for the electrode post 10 on the cover body 1 to pass through. The protective pad 5 is rotatably connected to one side of the cover gasket 4 in the width direction and has a snap-fit ​​state on the side of the cover gasket 4 facing away from the cover body 1. The protective pad 5 has a heat-fusion connection portion, and the cover gasket 4 has a corresponding heat-fusion portion. In the snap-fit ​​state, the heat-fusion connection portion can be heat-fused and fixed to the heat-fusion portion, thereby isolating the protective pad 5 between the welding area of ​​the electrode post 10 and the electrode assembly 3.

[0033] 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 above-mentioned hot-melt part and hot-melt connection part can adopt various structural forms suitable for plug-in hot-melt bonding, such as columnar or plate-shaped parts; the insulating parts can be made of materials with insulating properties such as rubber or plastic. The specific arrangement sequence and assembly method of the pole post 10 and the insulating parts on the cover plate body 1 can also be flexibly adjusted. For the parts required for the implementation of the overall solution but not involved in the above-mentioned overall setup, reasonable and flexible design can be carried out by referring to mature setup methods in the field and the actual situation during implementation. 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 many 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.

[0034] The number of pole posts 10 on the cover plate body 1 is usually two, positive and two negative, but there are also cases where multiple positive and negative pole posts 10 are provided; the pole post through holes 40 on the cover plate gasket 4 should be set accordingly to the arrangement of the pole posts 10 on the cover plate body 1. To accommodate the typical configuration of the pole posts 10 on the cover plate body 1, in this embodiment, as... Figure 2 As shown, in the length direction of the cover plate body 1, two pole posts 10 are provided at intervals on the cover plate body 1, and two pole post through holes 40 are provided corresponding to the pole posts 10; the protective pad 5 has pole post protective sections 50 corresponding to the two pole post through holes 40, and a middle connecting section 51 connecting the two pole post protective sections 50.

[0035] Two terminals 10 are spaced apart on the cover plate body 1, which is compatible with the typical configuration of positive and negative terminals 10 in most batteries. Correspondingly, two terminal through holes 40 are provided on the cover plate liner 4, allowing the bottom of each terminal 10 to pass through the inner side of the cover plate liner 4. Furthermore, the protective pad 5 is configured as a central connecting section 51 and terminal protection sections 50 located on both sides of the central connecting section 51. The two terminal protection sections 50 can respectively cover and protect the welding parts at the bottom of the two terminals 10, while the central connecting section 51 can form a good connection between the two terminal protection sections 50. The folding design of the cover plate liner 4 and the protective pad 5, when the protective pad 5 is unfolded, makes the entire insulating component a regular rectangle, which is convenient for the standardized stacking and storage of multiple insulating components, and also facilitates the use of integrated molding process to manufacture the insulating component.

[0036] Typically, an explosion-proof valve is installed in the middle of the cover plate body 1, between the two pole posts 10. Therefore, in this embodiment, an explosion-proof valve mounting hole 12 is provided on the cover plate body 1 between the two pole posts 10, and a through hole 43 is provided on the cover plate gasket 4 corresponding to the explosion-proof valve mounting hole 12. At the same time, multiple through holes 510 are provided on the middle connecting section 51 of the protective pad 5. The explosion-proof valve mounting hole 12 located in the middle of the cover plate body 1 between the two pole posts 10 provides good installation conditions for the explosion-proof valve on the cover plate body 1. Correspondingly, a through hole 43 is provided on the cover plate gasket 4 for the explosion-proof valve mounting hole 12 on the cover plate body 1, and a through hole 510 is provided on the middle connecting section 51 between the two pole protection sections 50, forming a smooth exhaust channel between the pole group 3 and the explosion-proof valve; once an abnormal situation such as a short circuit occurs inside the battery, the generated high-pressure gas can be smoothly discharged to the outside of the battery through the through hole 510, the through hole 43 and the explosion-proof valve, which can effectively reduce the risk caused by battery abnormality.

[0037] As mentioned above, the cover gasket 4 and the protective pad 5 can be made of various materials such as rubber and plastic; for example, polypropylene can be used. In this embodiment, the insulating component is integrally injection molded from plastic material. Integral injection molding of the insulating component not only provides excellent insulation performance but also offers a mature and reliable processing technology. Furthermore, designing both the cover gasket 4 and the protective pad 5 as sheet-like components not only ensures the insulation performance of the insulating component but also saves raw materials and reduces the space occupied by the insulating component inside the battery.

[0038] In addition, such as Figure 3 , Figure 4 As shown, the pole protection section 50 of this embodiment includes a central region 500 directly opposite the pole through hole 40, and an outer extension region 501 located around the central region 500; the heat-fusion connection is disposed in the outer extension region 501. Dividing the pole protection section 50 into two parts, the central region 500 and the outer extension region 501, when the central region 500 is directly opposite the pole through hole 40, the outer extension region 501 can extend outward to the outer edge of the pole through hole 40, thereby more reliably covering the welding part between the pole 10 and the tab 30; furthermore, by disposing of the heat-fusion connection in the outer extension region 501, interference between the heat-fusion connection and the pole 10, tab 30, etc., can be avoided, providing good space conditions for the tab 30 to pass through between the cover gasket 4 and the protective gasket 5.

[0039] Based on the above configuration, in this embodiment, the pole protection section 50 is connected to the cover plate gasket 4 by a bendable connecting rib 6, and two heat-fusion connection parts are provided at intervals in each extension region 501; both heat-fusion connection parts are provided at the end of the pole protection section 50 away from the connecting rib 6, and a channel is formed between the two heat-fusion connection parts for the electrode tab 30 to pass through to the middle region 500.

[0040] A bendable connecting rib 6 is provided between each pole protection section 50 and the cover gasket 4. This not only ensures the integral structure of the protective pad 5 and the cover gasket 4, but also allows the protective pad 5 to be accurately fastened to the cover gasket 4 by bending the connecting rib 6 after the pole lug 30 and pole 10 are welded. There are various options for the specific design of the connecting rib 6. For example, the connecting rib 6 can be designed as a plate with a thinned center, using a thinning groove in the center to facilitate bending. Alternatively, the connecting rib 6 can be designed as a very thin plate structure, utilizing the deformation properties of the material itself to achieve bending. Or, a long hole can be made in the center of the plate-shaped connecting rib 6, located at the bending point. Utilizing the weakened structural strength at the location of the long hole, the connecting rib 6 can also be made easy to bend.

[0041] For each pole post protection section 50, two heat-fusion connection parts are provided at intervals on it, and both heat-fusion connection parts are located on the side of the pole post protection section 50 away from the connecting rib 6. After the heat-fusion connection parts are fixed to the corresponding heat-fusion parts, the two heat-fusion connection points, together with the connecting rib 6, will form a triangular distribution of three-point connection, which can greatly improve the connection reliability between the pole post protection section 50 and the cover plate gasket 4, and further improve the stability and reliability of the isolation space formed between the cover plate gasket 4 and the pole post protection section 50 for connecting the pole tab 30 and the pole post 10. At the same time, the channel formed between the two heat-fusion connection points can be passed through the pole tab 30, and the two heat-fusion connection points can limit the passage of the pole tab 30 in the length direction of the cover plate gasket 4.

[0042] As mentioned above, the cover gasket 4 can be a sheet structure, and of course, the side facing the protective pad 5 can be designed as a neat flat surface; however, in this embodiment, it is still as... Figure 4 As shown, a protrusion 41 is formed on the side of the cover plate gasket 4 facing the protective pad 5 around the electrode post through hole 40; in the snap-fit ​​state, the electrode lug 30, which passes between the cover plate gasket 4 and the electrode post protective section 50, is clamped between the protrusion 41 and the electrode post protective section 50.

[0043] A ring of protrusions 41 are provided at the edge of the electrode through hole 40 on the cover plate gasket 4. After the protective pad 5 is fastened onto the cover plate gasket 4, the gap between the electrode protective section 50 and the protrusions 41 is just wide enough for the electrode tab 30 to pass through. The protrusions 41 and the electrode protective section 50 can better clamp and fix the electrode tab 30 passing through them in the vertical direction. Furthermore, based on the setting of the protrusions 41, the thickness of the edge of the electrode through hole 40 is increased, and a groove can be set on the side of the cover plate gasket 4 facing the cover plate body 1, so that the corresponding locking protrusions on the cover plate body 1 can engage and cooperate, allowing the cover plate gasket 4 to fit and be fixed more reliably on the cover plate body 1.

[0044] The pole protection section 50 on the protective pad 5 can also be designed as a neat flat surface, such as... Figure 4 As shown. Or, as... Figure 5 As shown, a recessed slag-receiving groove 502 can be formed in the middle region 500 of the pole post protection section 50, corresponding to the welding part of the pole post 10; and a hole 503 is provided on the side wall of the slag-receiving groove 502, while a gap is left between the hole 503 and the bottom of the slag-receiving groove 502. The slag-receiving groove 502 in the middle region 500 of the pole post protection section 50 can form a relatively spacious space below the pole post 10 to accommodate the welding protrusion of the electrode tab 30 and the pole post 10, and can also receive foreign objects such as welding slag formed during welding, preventing foreign objects from entering the electrode assembly 3.

[0045] like Figure 6 As shown, in the case of a slag receiving groove 502, the side wall of the slag receiving groove 502 in this embodiment has a hole 503, and there is a gap between the hole 503 and the bottom of the slag receiving groove 502. The hole 503 on the side wall of the slag receiving groove 502 not only helps to reduce the weight of the protective component, but also allows the electrolyte to enter the electrode assembly 3 of the battery through the slag receiving groove 502 and the hole 503 on its side wall when electrolyte is injected into the electrode assembly 3 through the electrode post through-hole 40. Furthermore, the gap between the hole 503 and the bottom of the slag receiving groove 502 reduces the risk of welding slag, foreign objects, etc., in the slag receiving groove 502 falling into the electrode assembly 3 through the hole 503. In practical implementation, multiple holes 503 can be evenly distributed along the edge of the slag receiving groove 502. A connecting rib will be formed between two adjacent holes 503. With the help of the elastic deformation performance of the connecting rib, when the bottom of the slag receiving groove 502 abuts against the electrode group 3, the slag receiving groove 502 forms a good elastic support between the electrode group 3 and the protective pad 5.

[0046] Continue to refer to Figure 6As shown, the gap H between the bottom of the hole 503 and the slag receiving groove 502, i.e., the effective depth of the slag receiving groove 502, can be flexibly set within a reasonable range. Preferably, the total depth of the slag receiving groove 502 can be set between 1.5mm and 8.5mm, such as 1.5mm, 4mm, 6mm, 8.5mm, etc. The depth of the slag receiving groove 502 is limited here so that the slag receiving groove 502 can better accommodate the protrusions or welding slag at the welding parts of the electrode tab 30 and the electrode post 10, so as to better reduce the risk of welding slag piercing the diaphragm. In a further preferred embodiment, the effective depth of the slag receiving groove 502 can be set between 0.3mm and 8mm, such as 0.3mm, 4mm, 6mm, 8mm, etc.

[0047] For the specific design of the heat-fusion section and the heat-fusion connection section, there are naturally many different structural options available; for example, the heat-fusion section can be designed as an insert plate, and the heat-fusion connection section can be designed as an insert joint. In this embodiment, as... Figure 5 , Figure 6 As shown, the protective pad 5 is provided with a boss 504, and the hot-melt connection part includes a hot-melt hole 505 provided on the boss 504. The hot-melt part includes a hot-melt column 42 provided on the cover plate liner 4. The hot-melt column 42 is inserted and hot-melted to be fixed in the hot-melt hole 505. By providing a boss 504 on the protective pad 5 and setting the hot-melt connection part in the form of a hot-melt hole 505 located on the boss 504, when the hot-melt column 42 on the cover plate liner 4 is inserted into the hot-melt hole 505, the hot-melt column 42 can be heated and hot-melted to be fixed in the hot-melt hole 505. At the same time, since the boss 504 is sandwiched between the cover plate liner 4 and the pole post protection section 50, by reasonably setting the height of the boss 504, a suitable gap height between the cover plate liner 4 and the pole post protection section 50 can be defined, thereby providing a suitable gap height dimension for the insertion of the electrode tab 30.

[0048] In summary, the battery cover assembly of this embodiment, by providing a bendable insulating component on the cover body 1, has a protective pad 5 on the insulating component that, in addition to having a snap-fit ​​state that can be fastened to the cover pad 4, also has an unfolded state that forms a certain angle with the cover pad 4. In the unfolded state, the tabs 30 led out from the electrode group 3 can be welded to the terminal post 10. After that, the protective pad 5 is snapped into the snap-fit ​​state. The cover pad 4 can form a reliable insulating isolation between the cover body 1 and the tabs 30. The protective pad 5 covers the welding area between the terminal post 10 and the tabs 30, ensuring the isolation and protection effect between the welding area and the electrode group 3, and preventing welding slag from falling into the electrode group 3 or welding protrusions from piercing the electrode group 3. The cover pad 4 and the protective pad 5 are connected by heat fusion, ensuring the reliability of the snap-fit ​​connection of the protective pad 5 on the cover pad 4, thereby forming a stable and reliable isolation and protection for the welding area between the battery tabs 30 and the terminal post 10.

[0049] Example 2 This embodiment relates to a battery, which has the battery cover assembly provided in Embodiment 1; an exemplary structure of the battery is as follows: Figures 7 to 11 As shown.

[0050] When using the battery cover assembly of this utility model in a battery, the insulating component must first be installed on the cover body 1 pre-installed with the terminal post 10; an insulating sleeve 11 is fitted on the terminal post 10 to achieve insulation isolation between the terminal post 10 and the cover body 1.

[0051] After that, as Figure 7 As shown, the battery cover assembly is placed on the open side of the battery housing 2, and the tabs 30 leading out from the electrode group 3 inside the battery housing 2 are arranged and attached to the bottom of the terminal post 10 for welding. At this time, as shown... Figure 7 , Figure 8 and Figure 9 As shown, the connecting rib 6 is not yet bent, and the protective pad 5 is in the unfolded state, providing ample space for the welding operation of the electrode lug 30 and the electrode post 10.

[0052] Without the battery cover assembly of this invention, the multiple tabs 30, due to their varying shapes and lengths and their dispersed location, are easily inserted upside down into the electrode assembly 3, causing a short circuit inside the electrode assembly 3 and affecting the product's safety and performance. With the protective component of this invention, each tab 30 corresponding to each electrode post 10 can be neatly arranged between two hot-melt posts 42 and attached to the bottom of the electrode post 10 to complete the welding operation.

[0053] like Figure 10 and Figure 11 As shown, after welding is completed, the connecting rib 6 is bent to fasten the protective pad 5 onto the cover plate liner 4, forming an isolation space between the pole post protective section 50 and the cover plate liner 4 to accommodate the welded part. Since the hot melt column 42 is hot melt fixed to the corresponding hot melt hole 505, the connection strength is reliable, thus the protective pad 5 is firmly fastened to the cover plate liner 4. With the help of the channel formed between the two hot melt fixed points, and the clamping and restraining effect of the protrusion 41 and the pole post protective section 50, a good standard restraint effect is formed on the pole lug 30 inserted therein. At this time, the pole post protective section 50 clamps and fixes the pole lug 30 to the cover plate liner 4 in the form of pressure lifting, and the pole lug 30 will no longer bend or deform, or even be inserted upside down into the pole group 3.

[0054] In summary, by adopting the battery cover assembly of this utility model, the shape of the tab 30 is well standardized and maintained before and after the electrode assembly 3 is assembled, which plays a role in fixing and shaping the tab 30. A stable and reliable isolation and protection is formed between the welding part of the electrode assembly 3 and the bottom of the terminal post 10. The tab 30 will not be inserted backward into the electrode assembly 3, and there will be no situation where welding slag punctures or falls into the electrode assembly 3, which reduces the probability of battery short circuit and improves battery safety performance.

[0055] 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 assembly, characterized in that: Includes a cover plate body and an insulating member disposed on the side of the cover plate body facing the electrode group; The insulating component includes an integrally connected cover plate gasket and a protective gasket. The cover plate gasket is attached to the cover plate body, and the cover plate gasket is provided with a pole post through hole for the pole post on the cover plate body to pass through. The protective pad is rotatably connected to one side of the cover plate liner in the width direction and has a fastening state that is fastened to the side of the cover plate liner facing away from the cover plate body. The protective pad is provided with a heat-fusion connection part, and the cover plate liner is correspondingly provided with a heat-fusion part; in the fastened state, the heat-fusion connection part can be heat-fused and fixed to the heat-fusion part, so that the protective pad forms an isolation between the welding part of the pole post and the pole group.

2. The battery cover assembly according to claim 1, characterized in that: Along the length of the cover plate body, two pole posts are spaced apart on the cover plate body, and two pole post through holes are provided corresponding to the pole posts; The protective pad has pole protection sections corresponding to the two pole through holes, and a middle connecting section connecting the two pole protection sections.

3. The battery cover assembly according to claim 2, characterized in that: The pole protection section includes a central region directly opposite the pole through hole, and an outer extension region surrounding the central region; the hot-melt connection portion is disposed in the outer extension region.

4. The battery cover assembly according to claim 3, characterized in that: The pole protection section is connected to the cover plate gasket by a bendable connecting rib, and the outer extension area is provided with two heat-melt connection parts at intervals; Both of the aforementioned heat-fusion connection portions are located at the end of the pole protection section away from the connecting rib, and a channel is formed between the two aforementioned heat-fusion connection portions for the pole lug to pass through to the central region.

5. The battery cover assembly according to claim 4, characterized in that: A protrusion is formed around the through hole of the pole post on the side of the cover plate gasket facing the protective pad; in the fastened state, the pole lug that passes between the cover plate gasket and the pole post protective section is clamped between the protrusion and the pole post protective section.

6. The battery cover assembly according to claim 3, characterized in that: The central region is formed with a slag receiving groove, which is provided corresponding to the welding part of the pole post; the side wall of the slag receiving groove is provided with holes, and there is a gap between the holes and the bottom of the slag receiving groove.

7. The battery cover assembly according to claim 2, characterized in that: An explosion-proof valve mounting hole is provided on the cover plate body between the two pole posts. Corresponding to the explosion-proof valve mounting hole, a through hole is provided on the cover plate gasket, and a through hole is provided on the middle connecting section.

8. The battery cover assembly according to claim 1, characterized in that: The insulating component is integrally injection molded from plastic material.

9. The battery cover assembly according to any one of claims 1 to 8, characterized in that: The protective pad is provided with a boss, and the hot-melt connection part includes a hot-melt hole provided on the boss. The hot-melt part includes a hot-melt column provided on the cover plate liner. The hot-melt column is inserted and hot-melt fixed in the hot-melt hole.

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

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