Lower plastic and battery

Abstract

The utility model provides a kind of lower plastic and battery, lower plastic includes main part and extension, main part is long strip shape with the battery cover plate, the both ends of the length direction of main part are equipped with extension, and the width L1 of main part is greater than the width L2 of extension, and the carding portion is equipped between each extension and main part.And pole post is used to connect with the lug of pole group, each extension can be bent relative to main part, and is connected by the carding portion and main part, and the extension after carding is abutted on the side of lug back to battery cover plate.The lower plastic of the utility model can effectively prevent the occurrence of pole group short circuit problem, and is beneficial to improve the safety and reliability of battery product.The width L1 of main part is greater than the width L2 of extension, which can effectively prevent short circuit caused by too small gap between lug and battery shell.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a plastic material and a battery. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, the welding of the tabs to the battery cover is a critical process in battery assembly, and its welding quality directly affects the battery's electrical performance and safety. Currently, after the welding process of the tabs to the battery cover is completed, there is a common technical problem that the tabs are of inconsistent shapes and are relatively scattered, making it easy for the tabs to be inserted backwards into the electrode assembly during subsequent assembly. If the tab is inserted backwards into the electrode assembly, it will directly cause a short circuit inside the electrode assembly, resulting in localized overheating inside the battery, which greatly threatens the safety and reliability of the battery product. Utility Model Content

[0003] In view of this, the present invention aims to provide a lower plastic layer to improve battery safety.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A type of plastic is applied to a battery cover plate through which terminal posts are inserted, the battery cover plate being elongated; The lower plastic includes a main body and an extension. The main body is a long strip shaped to conform to the battery cover. The extension is provided at both ends of the main body along its length. The width L1 of the main body is greater than the width L2 of the extension. A snap-fit ​​part is provided between each extension and the main body. The pole post is used to connect with the tab of the pole group. Each of the extension portions can be bent relative to the main body and is connected to the main body through the snap-fit ​​part. After snapping, the extension portion abuts against the side of the tab that is away from the battery cover.

[0005] Furthermore, the main body and the extension are integrally formed, and the main body has a plate and a connecting rib protruding to one side in the thickness direction of the plate. The connecting rib is connected to the extension portion, and a glue-reducing groove is provided at the connection between the two.

[0006] Furthermore, the length L3 of the connecting rib in the width direction of the main body portion and the width L2 of the extension portion satisfy the following condition: L3 = (0.35 - 0.6)L2.

[0007] Furthermore, the snap-fit ​​portion includes a buckle provided on the main body portion and a snap-fit ​​hole provided on the extension portion. The extension portion is provided with a snap-fit ​​protrusion protruding towards one side of the main body portion, and the snap-fit ​​hole is provided at the snap-fit ​​protrusion and penetrates the extension portion. The extended portion, after being snapped in, abuts against the main body portion via the snap-in protrusion.

[0008] Furthermore, the buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the main body and a snap-fit ​​block protruding radially outward from the connecting block. The buckle is engaged with the extension portion via the snap-fit ​​block.

[0009] Furthermore, the snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected to each other, wherein the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole; The connecting block is inserted into the first card hole, the snap-fit ​​block is snapped into the second card hole, and the end of the snap-fit ​​block away from the connecting block is recessed relative to the extension portion.

[0010] Compared with the prior art, this utility model has the following advantages: (1) The lower plastic of this utility model allows the extended portion of the lower plastic to be bent relative to the main body and to be engaged with the main body via a snap-fit ​​part. The engaged extended portion abuts against the side of the tab facing away from the battery cover, thus physically limiting the tab. This design restricts the movement space of the tab, effectively preventing the tab from being inserted backwards into the electrode assembly during subsequent assembly, thereby effectively preventing short circuits in the electrode assembly and improving the safety and reliability of the battery product. Moreover, the width L1 of the main body is greater than the width L2 of the extended portion, which effectively avoids bending space of the tab and prevents short circuits caused by insufficient gap between the tab and the battery casing.

[0011] (2) Molding the main body and the extension part as a single unit can improve production efficiency. By setting connecting ribs, the strength and rigidity of the connection between the main body and the extension part can be enhanced. At the same time, it is also convenient to form a flat space between the extension part and the main body to accommodate the electrode tab after bending, which can prevent excessive compression of the electrode tab. The setting of the rubber reduction groove makes the connection between the connecting rib and the extension part have a certain degree of flexibility. When the extension part is bent relative to the main body part, the rubber reduction groove can provide a certain deformation space for the connection, avoiding bending difficulties or damage to the connection due to excessive rigidity. This makes the bending operation of the extension part smoother and ensures a stable contact effect between the extension part and the electrode tab after snapping.

[0012] (3) By ensuring that the length of the connecting rib in the width direction of the main body and the width of the extension part satisfy the ratio L3 = (0.35 - 0.6)L2, the stress can be more reasonably distributed during the bending process of the extension part. The width L1 of the main body and the width L2 of the extension part should satisfy: L1 = L2 + (2.0 - 6.0) mm. This size range not only better avoids the bending space of the tabs, preventing short circuits caused by excessively small gaps between the tabs and the battery casing, but also better ensures the contact area between the extension part and the tabs, guaranteeing the fixing effect of the tabs. This effectively prevents the tabs from being inserted backwards into the electrode assembly, reducing the risk of short circuits and improving the safety and reliability of the battery during use.

[0013] (4) By making the snap-fit ​​part include a snap fastener on the main body and a snap-fit ​​hole on the extension part, the structure is simple and easy to design and implement. By setting a snap-fit ​​protrusion on the extension part and setting the snap-fit ​​hole at the snap-fit ​​protrusion, and the extension part after snapping abutting against the main body through the snap-fit ​​protrusion, the structural strength at the snap-fit ​​hole can be improved, which is conducive to ensuring the snap-fit ​​strength between the extension part and the main body. Moreover, the abutting between the snap-fit ​​protrusion and the main body can improve the firmness of the extension part, thereby improving the fixing effect of the electrode ear.

[0014] (5) By making the snap fastener include multiple sub-snap fasteners spaced circumferentially along the snap-fit ​​hole, and making each sub-snap fastener include a connecting block and a snap-fit ​​block, when the snap fastener is snapped into the snap-fit ​​hole, the multiple snap-fit ​​blocks can easily shift together towards the center line of the snap fastener, so that the snap fastener can be smoothly snapped into the snap-fit ​​hole, thereby simplifying the snap-fit ​​process and improving assembly efficiency. Moreover, after the snap-fit ​​is completed, each snap-fit ​​block is reset under the action of its respective sub-connecting block, so that the snap fastener can be firmly snapped into the snap-fit ​​hole, thereby improving the reliability of the snap-fit.

[0015] (6) By making the snap-fit ​​hole include a first snap-fit ​​hole and a second snap-fit ​​hole, and the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole, the connecting block can play a preliminary positioning role after being inserted into the first snap-fit ​​hole. When the snap-fit ​​block is snapped into the second snap-fit ​​hole, a radial limit is formed, which can effectively prevent the buckle from coming out axially or radially. Setting the second snap-fit ​​hole to a larger diameter can provide a larger snap-fit ​​space for the snap-fit ​​block, which can increase the contact area between the two and thus improve the snap-fit ​​firmness between the extension part and the main body part.

[0016] Another objective of this invention is to provide a battery comprising a battery casing and an electrode assembly disposed within the battery casing, the battery casing having a lower plastic layer as described above.

[0017] Furthermore, the electrode assembly consists of two units disposed within the battery casing, and each electrode assembly has a tab at both ends; the electrode post consists of two units spaced apart along the length of the battery cover. The tabs at the same end of the two electrode groups are connected to the same electrode post, and the extension portions at each end abut against the two tabs at the corresponding ends.

[0018] Furthermore, the two ends of the battery cover in the width direction are respectively separated from the corresponding electrode group by a first preset distance G, and the first preset distance G satisfies: 1.0mm≤G≤3.5mm.

[0019] Furthermore, the extended portion covers the tab, and the two ends of the extended portion along its length are respectively at a second preset distance H from the corresponding end of the tab, and the second preset distance H is not less than 5mm.

[0020] Compared with the prior art, this utility model has the following advantages: (1) The battery of this application, by setting the lower plastic as described above, can effectively prevent the tabs from being inserted into the electrode group in reverse during subsequent assembly, thereby effectively preventing the short circuit problem of the electrode group and improving the safety and reliability of the battery.

[0021] (2) By setting two electrode groups and connecting the tabs at the same end of the two electrode groups to the same terminal post, and having the extended portion abut against the two tabs at the corresponding ends, the fixing area and constraint force of the lower plastic on the tabs can be increased, which can effectively prevent the tabs from shifting or being inserted backwards, further reducing the risk of short circuit in the electrode group and greatly improving the safety performance of the battery. Moreover, since the extended portion abuts against two tabs at the same time, there is no need to set up a complex fixing structure for each tab separately, making the internal structure of the battery more compact.

[0022] (3) By maintaining a first preset distance of 1.0mm≤G≤3.5mm between the two ends of the battery cover plate and the corresponding electrode assembly in the width direction, a safe gap between the bent electrode tab and the battery casing can be ensured, preventing the risk of short circuit caused by contact with the battery casing. If the distance is too small, the electrode tab may collide hard with the battery cover plate due to installation errors or changes in internal battery pressure, resulting in electrode tab damage or even short circuit; if the distance is too large, the electrode tab will shake more inside the battery, which may lead to the risk of it being inserted backwards into the electrode assembly. This distance range ensures that the electrode tab moves within a limited space, which can avoid excessive contact damage between the electrode tab and the battery cover plate, and prevent electrode tab displacement from causing a short circuit, thus significantly improving battery safety.

[0023] (4) By ensuring that the second preset distance H between the extension portion and the tab is not less than 5mm, the contact area between the extension portion and the tab can be increased, ensuring the coverage effect on the tab and enhancing the fixing effect on the tab. Moreover, the larger contact area can disperse external forces and prevent the tab from shifting due to vibration, squeezing and other factors during battery use, effectively avoiding short circuits caused by the tab being inserted backward into the electrode assembly, thus improving the safety performance of the battery from the root. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the application structure of the lower plastic described in the embodiments of this application; Figure 2 This is an assembly diagram of the lower plastic and the electrode assembly as described in the embodiments of this application; Figure 3 for Figure 2 A schematic diagram of the structure shown from another perspective; Figure 4 for Figure 3 Sectional view of the DD line; Figure 5 for Figure 3 Sectional view of the middle EE line; Figure 6 for Figure 5 Enlarged view of section F in the middle; Figure 7 This is an assembly diagram of the lower plastic and the electrode tab before bending, as described in the embodiments of this application; Figure 8 for Figure 7 Enlarged view of section J in the middle; Figure 9 This is a schematic diagram of the second structure of the lower plastic as described in the embodiments of this application; Figure 10 This is an assembly diagram of the second structure of the lower plastic and the electrode assembly described in the embodiments of this application; Figure 11 for Figure 10 A schematic diagram of the structure shown from another perspective; Figure 12 This is a schematic diagram of the application structure of the lower plastic before the extension portion is bent, as described in the embodiments of this application; Figure 13 for Figure 11 A cross-sectional view of the MM line; Figure 14 This is a schematic diagram of the lower plastic material described in the embodiment of this application from another perspective before the extended portion is bent. Figure 15 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a first-view perspective; Figure 16 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a second perspective; Figure 17 for Figure 12 Enlarged view of section A; Figure 18 for Figure 15 Enlarged view of section B; Figure 19 for Figure 16 A cross-sectional view of the CC line; Figure 20 This is an assembly diagram of the lower plastic and the electrode assembly as described in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures: 1. Battery cover; 2. Lower plastic; 201. Main body; 2011. Buckle; 20111. Sub-buckle; 201111. Connecting block; 201112. Snap-fit ​​block; 2012. Through hole; 202. Extension portion; 2021. Snap-fit ​​hole; 202111. First snap-fit ​​hole; 202112. Second snap-fit ​​hole; 2022. Snap-fit ​​protrusion; 2023. Protective cavity; 2024. Notch; 203. Connecting bar; 2031. First part; 2032. Second part; 3. Pole post; 4. Polar ears; 5. Pole group; K, Glue Reduction Groove. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0027] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, 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 simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] 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, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Currently, after the welding process of tab 4 to the battery cover is completed, there is a common technical problem where the tab 4 has an inconsistent shape and a relatively scattered distribution. This phenomenon not only results in irregular appearance of tab 4, but more importantly, it makes tab 4 very prone to being inserted backwards into the electrode assembly during subsequent assembly. Once tab 4 is inserted backwards into the electrode assembly, it will directly cause an internal short circuit in the electrode assembly, resulting in localized overheating inside the battery, which greatly threatens the safety and reliability of the battery product. At the same time, a short circuit in the electrode assembly will significantly reduce the battery's charging and discharging efficiency and lifespan, leading to a significant decline in battery performance.

[0031] Therefore, an embodiment of the first aspect of this application provides a lower plastic material applied to a battery cover 1 on which the terminal post 3 is inserted. The battery cover 1 is elongated. The lower plastic material 2 includes a main body portion 201 and an extension portion 202. The main body portion 201 is elongated and conforms to the shape of the battery cover 1. Extension portions 202 are provided at both ends of the main body portion 201 in the length direction. The width L1 of the main body portion 201 is greater than the width L2 of the extension portion 202. A snap-fit ​​portion is provided between each extension portion 202 and the main body portion 201.

[0032] The pole post 3 is used to connect with the tab 4 of the pole group 5. Each extension part 202 can be bent relative to the main body part 201 and is connected to the main body part 201 by a snap-fit ​​part. After snap-fit, the extension part 202 abuts against the side of the tab 4 that is away from the battery cover plate 1.

[0033] Therefore, by allowing the extension portion 202 of the lower plastic 2 to bend relative to the main body portion 201 and to snap into the main body portion 201 via a snap-fit ​​part, the snap-fit ​​extension portion 202 abuts against the side of the tab 4 facing away from the battery cover plate 1, thus physically limiting the tab 4. This arrangement restricts the movement space of the tab 4, effectively preventing the tab 4 from being inserted backwards into the electrode assembly 5 during subsequent assembly, thereby effectively preventing short circuits in the electrode assembly 5 and improving the safety and reliability of the battery product. Moreover, the width L1 of the main body portion 201 is greater than the width L2 of the extension portion 202, effectively avoiding bending space for the tab 4 and preventing short circuits caused by excessively small gaps between the tab 4 and the battery casing.

[0034] Based on the above overall introduction, specifically, as an exemplary structural form, combined with Figures 1 to 20 As shown, similar to existing technologies, the lower plastic component, in addition to the aforementioned battery cover 1, terminal post 3, and lower plastic component 2, typically also includes an upper plastic component disposed between the terminal post 3 and the other side of the battery cover 1, and a sealing element disposed between the battery cover 1 and the terminal post 3. Furthermore, the specific structure of the terminal post 3, the mounting method of the terminal post 3 and the lower plastic component 2 on the battery cover 1, and the structure and material of the upper plastic component and the sealing element can all refer to existing structures; this embodiment does not make any improvements in these aspects.

[0035] In specific implementation, it can be as follows: Figure 16 As shown, the width L1 of the main body 201 and the width L2 of the extension 202 satisfy the following condition: L1 = L2 + (2.0-6.0) mm. This dimensional range not only effectively avoids the bending space of the tab 4, preventing short circuits caused by excessively small gaps between the tab 4 and the battery casing, but also ensures a good contact area between the extension 202 and the tab 4, guaranteeing the fixing effect of the tab 4. This effectively prevents the tab 4 from being inserted backwards into the electrode assembly 5, reducing the risk of short circuits and improving the safety and reliability of the battery during use.

[0036] In addition, in some of the feasible implementations, such as Figure 1 As shown, the terminals 3 are generally two terminals spaced apart along the length of the battery cover 1. The tabs 4 and extensions 202 on the electrode assembly 5 are correspondingly arranged one-to-one with the two terminals 3, and the two tabs 4 are welded to the two terminals 3 one-to-one. The lower plastic 2 is usually sandwiched between the terminals 3 and the battery cover 1. Its specific structure can be found in existing technologies. This embodiment focuses on describing the structure of the lower plastic 2. Furthermore, the lower plastic 2 can be made of the insulating material commonly used in existing batteries, and no specific limitation is made here.

[0037] In some of the exemplary implementations, combined with Figure 1 , Figure 15 and Figure 18As shown, the main body 201 and the extension 202 are integrally formed. The main body 201 has a plate and a connecting rib 203 protruding to one side in the thickness direction of the plate. The connecting rib 203 is connected to the extension 202, and a reducing groove K is provided at the connection between the two. Here, by integrally forming the main body 201 and the extension 202, the complex process and assembly errors caused by assembling multiple parts are avoided, the connection process and the number of parts are reduced, and the plastic manufacturing process can be made more efficient.

[0038] By providing a reducing groove K at the connection between the connecting rib 203 and the extension portion 202, the connection between the connecting rib 203 and the extension portion 202 can have a certain degree of flexibility. When the extension portion 202 is bent relative to the main body portion 201, the reducing groove K can provide a certain deformation space at the connection. This effectively avoids bending difficulties or damage to the connection due to excessive rigidity, making the bending operation of the extension portion 202 smoother, while ensuring a stable contact effect between the extension portion 202 and the tab 4 after snapping.

[0039] In specific implementation, combined with Figure 14 and Figure 15 As shown, two terminals 3 are located at both ends of the battery cover plate 1 along its length. Correspondingly, through holes 2012, corresponding to the terminals 3, are provided at both ends of the main body 201 along its length. Furthermore, the two electrode groups 5 can be simultaneously connected to the tabs 4 of the two electrode groups 5, meaning it can be used in a dual-cell battery.

[0040] Meanwhile, two extension portions 202 are respectively provided at both ends of the main body portion 201 along its length, corresponding to two through holes 2012, and a vent is provided between the two through holes 2012. This vent corresponds to the explosion-proof valve on the battery cover plate 1. In addition, each extension portion 202 is also generally rectangular to provide a larger contact area with the tab 4, thereby further improving the fixing effect of the tab 4.

[0041] In some feasible embodiments, the length L3 of the connecting rib 203 in the width direction of the main body 201 and the width L2 of the extension 202 satisfy the following condition: L3 = (0.35-0.6)L2. This arrangement allows the connecting rib 203 to reasonably distribute stress during the bending process of the extension 202. If the connecting rib 203 is too short, it will be difficult to sufficiently distribute stress, easily leading to damage at the connection due to stress concentration; if it is too long, it may affect the bending flexibility of the extension 202 and the compactness of the overall structure. This dimensional ratio ensures that the connecting rib 203 can effectively buffer bending stress while facilitating normal bending of the extension 202, thereby improving the structural reliability of the lower plastic during long-term use and reducing the risk of component damage due to stress problems.

[0042] Specific implementation, such as Figure 15 As shown, the connecting rib 203 can be located at the middle of the length of the extension portion 202 and extend along the length of the extension portion 202, so that the extension portion 202 and the main body portion 201 have good connection strength. Furthermore, the adhesive reduction groove K extends through the length of the connecting rib 203 to facilitate the bending of the extension portion 202 relative to the main body portion 201.

[0043] Among them, such as Figure 18 As shown, the connecting rib 203 includes a first portion 2031 disposed on the main body portion 201, and a second portion 2032 extending to one side of the first portion 2031. The aforementioned adhesive-reducing groove K is specifically disposed on the second portion 2032. Furthermore, the second portion 2032 is disposed at the end of the first portion 2031 away from the main body portion 201, and is a plate-like structure of uniform thickness extending outward from the main body portion 201 to connect with the extension portion 202, and also facilitates bending.

[0044] In some feasible embodiments, the snap-fit ​​portion includes a snap fastener 201 on the main body portion 201 and a snap-fit ​​hole 2021 on the extension portion 202. The extension portion 202 has a snap-fit ​​protrusion 2022 protruding towards one side of the main body portion 201. The snap-fit ​​hole 2021 is located at the snap-fit ​​protrusion 2022 and passes through the extension portion 202. Moreover, after snapping, the extension portion 202 abuts against the main body portion 201 through the snap-fit ​​protrusion 2022.

[0045] Here, by including a latch 2011 on the main body 201 and a latching hole 2021 on the extension 202, the structure is simple and easy to design and implement. Moreover, after the extension 202 is latched to the main body 201, the latch 2011 can be exposed on the outside, thereby facilitating the operation of the latch 2011 to separate the extension 202 from the main body 201, which is convenient for later maintenance and assembly.

[0046] By providing a snap-fit ​​protrusion 2022 on the extension portion 202 and setting a snap-fit ​​hole 2021 at the snap-fit ​​protrusion 2022, and by having the extension portion 202, after snapping, abut against the main body portion 201 through the snap-fit ​​protrusion 2022, the structural strength at the snap-fit ​​hole 2021 can be improved, which helps to ensure the snap-fit ​​strength between the extension portion 202 and the main body portion 201. Moreover, the abutment between the snap-fit ​​protrusion 2022 and the main body portion 201 can improve the firmness of the extension portion 202, thereby improving the fixing effect on the tab 4.

[0047] In specific implementation, combined with Figure 14 and Figure 15As shown, the snap-fit ​​hole 2021 is located at the end of the extension portion 202 away from the connecting rib 203. This design prevents the end of the extension portion 202 away from the connecting rib 203 from warping, thereby ensuring the fixing effect of the electrode lug 4. Furthermore, a snap-fit ​​hole 2021 is only provided in the middle of the extension portion 202 along its length, and the buckle 2011 is correspondingly provided with each snap-fit ​​hole 2021. Additionally, in conjunction with... Figure 6 and Figure 19 As shown, the snap-fit ​​protrusion 2022 is, for example, configured as a cylinder.

[0048] It should be noted that, in addition to placing the buckle 2011 on the main body 201 and the snap-fit ​​hole 2021 on the extension 202, the buckle 2011 can also be placed on the extension 202 and the snap-fit ​​hole 2021 on the main body 201. Furthermore, the number of snap-fit ​​holes 2021 is not limited to the one shown in the figure; their position and number can be adjusted according to design requirements. And besides making the snap-fit ​​protrusion 2022 cylindrical, making it rectangular or irregular in shape is also feasible.

[0049] In some exemplary embodiments, the snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap-fit ​​hole 2021. Each sub-snap fastener 20111 has a connecting block 201111 connected to the main body portion 201, and a snap-fit ​​block 201112 protruding radially outward from the connecting block 201111 along the snap fastener 2011. The snap fastener 2011 is snapped onto the extension portion 202 by the snap-fit ​​block 201112.

[0050] At this point, when the snap fastener 2011 is engaged in the snap-fit ​​hole 2021, the multiple snap-fit ​​blocks 201112 can easily shift towards the center line of the snap fastener 2011, allowing the snap fastener to smoothly engage in the snap-fit ​​hole 2021, thereby simplifying the snap-fit ​​process and improving assembly efficiency. Furthermore, after the snap-fit ​​is completed, each snap-fit ​​block 201112 resets under the action of its respective connecting block 201111, ensuring that the snap fastener 2011 is securely engaged in the snap-fit ​​hole 2021, thus improving the reliability of the snap-fit.

[0051] In specific implementation, combined with Figure 17As shown, four individual snap fasteners 20111 are evenly distributed circumferentially along the snap-fit ​​hole 2021, and both the snap-fit ​​block 201112 and the connecting block 201111 are fan-shaped. This design can evenly distribute the external force on the extension part 202 to the main body part 201, avoiding local stress concentration. Compared to a smaller number of individual snap fasteners 20111, the four individual snap fasteners 20111 form a stable support structure. When the electrode tab 4 is subjected to force and shifts, each individual snap fastener 20111 can jointly provide a reaction force, effectively suppressing the loosening or deformation of the extension part 202, thereby enhancing the overall strength and reliability of the snap-fit ​​structure and reducing the risk of the electrode tab 4 being inserted backwards.

[0052] It should be noted that, in addition to the four evenly distributed snap fasteners 20111 shown in the figure, the number can also be three or five, or other quantities. Furthermore, besides evenly distributing multiple snap fasteners 20111 along the circumference of the snap-fit ​​holes 2021, they can also be distributed unevenly according to design requirements.

[0053] In some exemplary embodiments, the snap-fit ​​hole 2021 includes a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112 that are connected to each other, wherein the diameter of the first snap-fit ​​hole 202111 is smaller than the diameter of the second snap-fit ​​hole 202112. Furthermore, the connecting block 201111 is inserted into the first snap-fit ​​hole 202111, and the snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112, with one end of the snap-fit ​​block 201112 recessed relative to the extension portion 202.

[0054] By making the snap-fit ​​hole 2021 include a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112, and the diameter of the first snap-fit ​​hole 202111 is smaller than that of the second snap-fit ​​hole 202112, the connecting block 201111 can play a preliminary positioning role after being inserted into the first snap-fit ​​hole 202111. When the snap-fit ​​block 201112 is engaged in the second snap-fit ​​hole 202112, a radial limit is formed, which can effectively prevent the buckle 2011 from disengaging axially or radially. Furthermore, setting the second snap-fit ​​hole 202112 to have a larger diameter provides a larger snap-fit ​​space for the snap-fit ​​block 201112, increasing the contact area between the two and thus improving the snap-fit ​​strength between the extension portion 202 and the main body portion 201.

[0055] In some embodiments, combined Figure 9 and Figure 13 As shown, corresponding to the through hole 2012 on the main body 201, a protective cavity 2023 with an open end is further formed on each extension 202. Furthermore, the protective cavity 2023 is recessed to the side away from the main body 201, which can better accommodate the welding slag at the welding position of the tab 4, thereby reducing the risk of welding slag puncturing the separator and causing a short circuit in the battery, and improving the safety performance of the battery.

[0056] In some exemplary embodiments, a notch 2024 is provided on the extension 202 at the edge of the opening end of the protective cavity 2023, the notch 2024 being for the flow of electrolyte. In specific implementations, such as... Figure 17 As shown, the protective cavity 2023 is rectangular, and multiple notches 2024 are provided at intervals on each edge of the protective cavity 2023.

[0057] In some of the exemplary implementations, such as Figure 13 As shown, the depth of the protective cavity 2023 is less than the distance between the extension portion 202 of the bent tab 4 and the pole group 5, thereby creating a certain gap between the protective cavity 2023 and the pole group 5.

[0058] In some exemplary embodiments, the opening area of ​​the notch 2024 can be relatively large to give the protective cavity 2023 a certain degree of elasticity. Furthermore, the depth of the protective cavity 2023 is equal to the distance between the extended portion of the bent tab 4 and the electrode assembly 5, so that the protective cavity 2023 abuts against the electrode assembly 5. Therefore, when the electrode assembly 5 shakes up and down, the protective cavity 2023 can buffer the shaking of the electrode assembly 5, achieving the purpose of protecting the electrode assembly 5. This can solve the risks of the tab 4 tearing and the separator puncturing due to the shaking of the electrode assembly 5, and further improve the safety performance of the battery.

[0059] It is worth noting that, regarding this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still... Figures 1 to 20 As shown, the lower plastic 2 includes a main body 201 and an extension 202, which are integrally formed. The main body 201 has a plate body and a connecting rib 203 protruding to one side in the thickness direction of the plate body. The connecting rib 203 is connected to the extension 202, and a reducing groove K is provided at the connection point. Furthermore, the width L1 of the main body 201 is greater than the width L2 of the extension 202, and the length L3 of the connecting rib 203 in the width direction of the main body 201 satisfies the following condition between the length L3 of the connecting rib 203 in the width direction of the main body 201 and the width L2 of the extension 202: L3 = (0.35 - 0.6)L2.

[0060] The snap-fit ​​portion includes a snap fastener 2011 provided on the main body portion 201 and a snap-fit ​​hole 2021 provided on the extension portion 202. The snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap-fit ​​hole 2021. Each sub-snap fastener 20111 has a connecting block 201111 connected to the main body portion 201 and a snap-fit ​​block 201112 protruding radially outward from the connecting block 201111. The snap fastener 2011 is snapped onto the extension portion 202 by the snap-fit ​​block 201112.

[0061] The snap-fit ​​hole 2021 includes a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112 that are connected to each other. The diameter of the first snap-fit ​​hole 202111 is smaller than the diameter of the second snap-fit ​​hole 202112. The connecting block 201111 is inserted into the first snap-fit ​​hole 202111, and the snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112. The end of the snap-fit ​​block 201112 away from the connecting block 201111 is recessed relative to the extension portion 202.

[0062] In the preferred embodiment of the upper and lower plastics, the specific configuration and arrangement of each structure in the lower plastic 2 can still be found in the descriptions of the above exemplary embodiments, and the beneficial effects brought about by its design can also be found in the descriptions of the above exemplary embodiments.

[0063] An embodiment of the second aspect of this application provides a battery, including a battery housing and an electrode assembly disposed within the battery housing, the battery housing having the aforementioned lower plastic.

[0064] In some exemplary implementations, combined with Figures 2 to 8 As shown, there are two electrode groups 5 located inside the battery casing, and each electrode group 5 has a tab 4 at both ends. There are two pole posts 3 spaced apart along the length of the battery cover plate 1. Furthermore, the tabs 4 at the same end of the two electrode groups 5 are connected to the same pole post 3, and the extension portions 202 at each end abut against the two tabs 4 at the corresponding ends.

[0065] By setting two electrode groups 5 and two terminal posts 3, the space inside the battery casing can be fully utilized, avoiding space waste caused by unreasonable layout of electrode groups 5 and terminal posts 3. Furthermore, by simultaneously abutting the two tabs 4 with the extension portion 202, the internal structure of the battery can be made more compact, which not only facilitates the miniaturization and thinning of the battery, but also allows for the inclusion of more active material within the same battery casing size, thereby increasing the battery's energy density.

[0066] In specific implementation, such as Figure 4 As shown, since the battery cover 1 is generally elongated, the two electrode groups 5 in this embodiment are arranged side by side along the width direction of the battery cover 1 and abut against each other, thereby further improving the compactness of the internal structure of the battery. Moreover, the cross-section of each electrode group 5 is an elongated strip, and its length is slightly smaller than that of the battery cover 1, so as to make full use of the space inside the battery casing and improve the energy density of the battery.

[0067] In some exemplary implementations, such as Figure 4 As shown, the two ends of the battery cover plate 1 in the width direction are respectively separated from the corresponding pole group 5 by a first preset distance G, and the first preset distance G satisfies: 1.0mm≤G≤3.5mm.

[0068] By maintaining a first preset distance of 1.0mm ≤ G ≤ 3.5mm between the two ends of the battery cover plate 1 in the width direction and the corresponding terminal group 5, a safe gap between the bent tab 4 and the battery casing can be ensured, preventing the risk of short circuit due to contact with the battery casing. If the distance is too small, the tab 4 may contact the battery cover plate 1 due to installation errors or changes in internal battery pressure, leading to damage to the tab 4 or even a short circuit; if the distance is too large, the tab 4 will move more inside the battery, increasing the risk of it being inserted backwards into the terminal group 5. This distance range ensures that the tab 4 moves within a limited space, avoiding excessive contact damage between the tab 4 and the battery cover plate 1, and preventing the tab 4 from shifting and causing a short circuit, thus significantly improving battery safety.

[0069] In practice, the first preset distance G between the two electrode groups 5 and the corresponding ends of the battery cover 1 can be set to 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, or other values. Of course, in addition to setting the first preset distance G between the two electrode groups and the corresponding ends of the battery cover to the same value, it can also be set to different values ​​within the above range according to design requirements.

[0070] In some exemplary implementations, combined with Figure 7 and Figure 8 As shown, the extension portion 202 is a long strip extending along the length direction of the main body portion 201, and both ends of the extension portion 202 are respectively at a second preset distance H from the corresponding ends of the tab 4, and the second preset distance H is not less than 5mm. This configuration increases the contact area between the extension portion 202 and the tab 4, ensuring the coverage effect of the tab 4 and enhancing the fixing effect of the tab 4. Moreover, the larger contact area can disperse external forces and prevent the tab 4 from shifting due to vibration, compression, or other factors during battery use, effectively preventing the tab 4 from being inserted backwards into the electrode assembly 5 and causing a short circuit, thus fundamentally improving the safety performance of the battery.

[0071] In specific implementation, for example, the length of the extension portion 202 can be set between 18mm and 50mm, while the width of the tab 4 can be set between 7mm and 45mm. At the same time, it is sufficient to ensure that the distance between each end of the extension portion 202 and the tab 4 on one side is not less than 5mm.

[0072] The battery in this embodiment, by setting the lower plastic as described above, can have better safety and better space utilization.

[0073] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A type of plastic material applied to a battery cover plate through which terminals are inserted, the battery cover plate being elongated, characterized in that: The lower plastic includes a main body and an extension. The main body is a long strip shaped to conform to the battery cover. The extension is provided at both ends of the main body along its length. The width L1 of the main body is greater than the width L2 of the extension. A snap-fit ​​part is provided between each extension and the main body. The pole post is used to connect with the tab of the pole group. Each of the extension portions can be bent relative to the main body and is connected to the main body through the snap-fit ​​part. After snapping, the extension portion abuts against the side of the tab that is away from the battery cover.

2. The lower plastic according to claim 1, characterized in that: The main body and the extension are integrally formed. The main body has a plate and a connecting rib protruding to one side in the thickness direction of the plate. The connecting rib is connected to the extension portion, and a glue-reducing groove is provided at the connection between the two.

3. The lower plastic according to claim 2, characterized in that: The connecting rib satisfies the following relationship between its length L3 in the width direction of the main body and its width L2 in the extension portion: L3 = (0.35 - 0.6)L2; and / or, The width L1 of the main body and the width L2 of the extension satisfy the following condition: L1 = L2 + (2.0 - 6.0) mm.

4. The lower plastic according to claim 1, characterized in that: The snap-fit ​​portion includes a buckle provided on the main body and a snap-fit ​​hole provided on the extension portion. The extension portion is provided with a snap-fit ​​protrusion protruding to one side of the main body, and the snap-fit ​​hole is provided at the snap-fit ​​protrusion and penetrates the extension portion. The extended portion, after being snapped in, abuts against the main body portion via the snap-in protrusion.

5. The lower plastic according to claim 4, characterized in that: The buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the main body and a snap-fit ​​block protruding radially outward from the connecting block. The buckle is engaged with the extension portion via the snap-fit ​​block.

6. The lower plastic according to claim 5, characterized in that: The snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected to each other, wherein the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole; The connecting block is inserted into the first card hole, the snap-fit ​​block is snapped into the second card hole, and the end of the snap-fit ​​block away from the connecting block is recessed relative to the extension portion.

7. A battery, characterized in that: It includes a battery housing and an electrode assembly disposed within the battery housing, the battery housing having a lower plastic layer as described in any one of claims 1 to 6.

8. The battery according to claim 7, characterized in that: The electrode assembly consists of two electrodes disposed within the battery casing, and each electrode assembly has a tab at both ends. The electrode post consists of two electrodes spaced apart along the length of the battery cover plate. The tabs at the same end of the two electrode groups are connected to the same pole post, and the extension portions at each end abut against the two tabs at the corresponding ends.

9. The battery according to claim 8, characterized in that: The two ends of the battery cover in the width direction are respectively separated from the corresponding electrode group by a first preset distance G, and the first preset distance G satisfies: 1.0mm≤G≤3.5mm.

10. The battery according to claim 7, characterized in that: The extended portion is a long strip extending along the length direction of the main body portion; The two ends of the extension portion along its length are respectively at a second preset distance H from the corresponding ends of the electrode tab, and the second preset distance H is not less than 5mm.

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