Battery and insulation structure thereof

Abstract

The application relates to the technical field of power batteries, and provides a battery and an insulation structure thereof. The battery insulation structure is used for isolating a cover plate and a pole group. The cover plate is in a strip shape, and a pole column is used for being connected with a tab of the pole group. The battery insulation structure comprises a structure body. The structure body comprises a main body part conforming to the cover plate, a bending part arranged at two ends of the main body part in a length direction, and a protection part arranged on each end bending part. Each end protection part can be folded to the main body part through the bending part and is connected with the main body part. The connected protection part can be arranged on one side of the pole column and abuts against the tab. The length L1 of the bending part in the width direction of the main body part and the width L2 of the protection part satisfy the relationship L1=(0.25-0.5)L2. The battery insulation structure can effectively avoid the short circuit problem of the pole group caused by the reverse insertion of the tab, can effectively guarantee the safety performance and normal work of the battery, and can improve the safety of the battery.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a battery and its insulation structure. Background Technology

[0002] In battery manufacturing, the welding process between the tabs and the cover plate is a crucial step in ensuring the electrical connection performance of the battery. Currently, after welding the tabs and cover plate, there is a common problem of inconsistent tab shapes and scattered distribution, making it easy for the tabs to be inserted backwards into the electrode assembly during battery assembly. Once the tabs are inserted backwards into the electrode assembly, it will directly cause a short circuit in the electrode assembly, which not only seriously affects the safety performance of the battery product and may cause safety accidents such as overheating, fire, or even explosion, but also significantly reduces the battery's charge and discharge performance and lifespan, greatly limiting the improvement of battery product quality and reliability. Utility Model Content

[0003] In view of this, the present invention aims to propose a battery insulation structure to improve the safety performance of the battery.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery insulation structure for isolating a cover plate from an electrode assembly, wherein the cover plate is elongated and an electrode post passing through the cover plate is used to connect with the electrode tabs of the electrode assembly. The structure includes a main body, which is conformed to the cover plate, a bent portion at both ends of the main body in the length direction, and a protective portion on each of the bent portions. The protective portion at each end can be folded onto the main body through the bent portion and connected to the main body. The connected protective portion can block one side of the electrode post and abut against the electrode tab. The length L1 of the bent portion in the width direction of the main body portion and the width L2 of the protective portion satisfy the following condition: L1 = (0.25 - 0.5)L2.

[0005] Furthermore, the structural body is integrally formed, and the bent portion protrudes towards the protective portion on the side closer to the main body. The bent portion has a hollowed-out hole.

[0006] Furthermore, the perforated hole extends along the width direction of the main body portion; and / or, The main body has notches located on both sides of the length of the bent portion.

[0007] Furthermore, the length M1 of the perforated hole is between 2.5mm and 8mm, and the width M2 of the perforated hole is between 0.8mm and 3.0mm.

[0008] Furthermore, the structural body is integrally formed, and at least one side of the bent portion has a glue-reducing groove, and the bent portion can be bent through the glue-reducing groove; The depth h of the adhesive reduction groove and the thickness H of the bending portion satisfy the following relationship: h = (1 / 3 - 1 / 2)H.

[0009] Furthermore, at least one of the protective parts is provided with a heat-fusion section between it and the main body part, the heat-fusion section heat-fuses the protective part and the main body part together.

[0010] Furthermore, the hot-melt section includes a hot-melt column disposed on the main body portion and a hot-melt hole disposed on the protective portion; The protective part has a protrusion protruding to one side of the main body, and the hot-melt hole is provided on the protrusion.

[0011] Furthermore, the hot-melt hole includes a first hole and a second hole that are connected to each other, wherein the diameter of the first hole is smaller than the diameter of the second hole; The hot-melt column is adapted to the first hole, and the hot-melt column has an exposed portion that is exposed to the second hot-melt hole, and the exposed portion fills the second hole after hot melting.

[0012] Furthermore, the depth P of the hot-melt hole is between 1.2 mm and 5.0 mm; and / or, The inner diameter d of the first hole and the inner diameter D of the second hole satisfy the following condition: Dd = (0.5-3) mm.

[0013] Compared with the prior art, this utility model has the following advantages: (1) The battery insulation structure described in this utility model can limit the position of the electrode tab by allowing the protective part to be placed on one side of the electrode post after bending and abutting against the electrode tab, thereby preventing the electrode tab from being inserted into the electrode group in reverse. This can effectively avoid the short circuit problem of the electrode group caused by the electrode tab being inserted in reverse, effectively ensure the safety performance and normal operation of the battery, and thus improve the safety of the battery.

[0014] By ensuring that the length L1 of the bent portion in the width direction of the main body and the width L2 of the protective portion satisfy L1 = (0.25 - 0.5)L2, the bent portion can be guaranteed to have a reasonable stress-bearing area. During the bending process of the protective portion, this dimensional ratio allows the bent portion to bear a more uniform stress distribution, avoiding the problems of being too long and difficult to bend, or being too short and lacking strength.

[0015] (2) By making the structure body integrally formed, the structural stability and production efficiency can be improved. By setting hollow holes on the bending part, it is not only conducive to lightweight design, but also the hollow holes can effectively alleviate the stress concentration phenomenon at the bending point during the bending process, making the bending operation smoother and effectively reducing the risk of the bending part breaking or cracking due to excessive stress.

[0016] (3) Extending the perforated hole along the width of the main body can further facilitate bending of the bending part. By providing notches on both sides of the bending part in the main body, the material constraint in the connection area between the bending part and the main body can be reduced, making the bending part more flexible when bending, requiring less bending force, and reducing the risk of material fatigue or damage due to excessive bending.

[0017] (4) Limit the length M1 of the cutout hole to 2.5mm - 8mm and the width M2 to 0.8mm - 3.0mm. This can prevent the cutout hole area from being too small and making it difficult to bend the bent part, and at the same time prevent the cutout hole area from being too large and making it difficult to ensure the structural strength of the bent part.

[0018] (5) By setting the adhesive reduction groove in the bending part, the material thickness at the bending point can be reduced, the force required for bending can be reduced, which is conducive to bending of the bending part, and at the same time, it can better maintain the connection between the bending part and the main body. Setting the relationship between the depth h of the adhesive reduction groove and the thickness H of the bending part as h=(1 / 3 - 1 / 2)H can ensure that while ensuring bending performance, the bending part also has sufficient strength, and will not cause insufficient structural strength due to excessive adhesive reduction, thus affecting the overall performance of the insulation structure.

[0019] (6) By setting a heat-fusion part between the protective part and the main body, this integrated connection can effectively prevent the parts from loosening due to vibration, etc., and help ensure that the protective part will not fall off when it is in contact with the tab for a long time, thereby further eliminating the structural hidden danger of the tab being inserted backwards.

[0020] (7) The hot-melt part includes a hot-melt column on the main body and a hot-melt hole on the protective part. The structure is simple and easy to design and implement. By setting a protrusion on the protective part and placing the hot-melt hole on the protrusion, the contact area between the hot-melt hole and the hot-melt column can form a locally thickened structure, which can improve the connection between the protective part and the main body.

[0021] (8) The hot-melt hole includes a first hole and a second hole that are connected, and the diameter of the first hole is smaller than that of the second hole, so that the hot-melt hole can form a stepped hole. Before hot-melting, the hot-melt column is press-fitted with the first hole to achieve initial positioning. After hot-melting, the exposed molten material fills the second hole to form a locking protrusion, which can effectively prevent the protective part from twisting and loosening during battery vibration.

[0022] (9) Setting the depth H of the hot-melt hole between 1.2mm and 5.0mm can avoid excessive hot melting while ensuring the bonding strength. The inner diameter d of the first hole and the inner diameter D of the second hole should satisfy: Dd = (0.5-3)mm. This range allows for more controllable flow of the hot-melt material, effectively preventing insufficient filling due to a small difference in hole diameter or material overflow due to a large difference in hole diameter. Another objective of this utility model is to provide a battery, wherein the battery casing is provided with the battery insulation structure described above.

[0023] The battery of this application, by setting the battery insulation structure as described above, can effectively prevent the tabs from being inserted into the electrode assembly in reverse, thereby effectively preventing the occurrence of short circuit problems in the electrode assembly and improving the safety and reliability of the battery. 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 battery insulation structure described in an embodiment of the present invention; Figure 2 This is a schematic diagram of the battery insulation structure described in an embodiment of the present invention from another perspective; Figure 3 This is a schematic diagram of the battery insulation structure described in an embodiment of the present invention from another perspective. Figure 4 for Figure 3 Sectional view of line AA in the middle; Figure 5 for Figure 4 Enlarged view of section B; Figure 6 for Figure 4 Enlarged view of section C; Figure 7 This is an assembly diagram of the battery insulation structure and cover plate described in an embodiment of the present utility model; Figure 8 for Figure 7 A schematic diagram of the structure shown from another perspective; Figure 9This is an assembly diagram of the battery insulation structure, cover plate, and electrode assembly described in this embodiment of the invention, before the electrode tabs are bent. Figure 10 This is an assembly diagram of the battery insulation structure, cover plate, and electrode assembly described in this embodiment of the utility model. Figure 11 for Figure 10 A schematic diagram of the structure shown from another perspective; Figure 12 for Figure 11 Sectional view of the DD line; Figure 13 for Figure 12 Enlarged view of section E in the middle; Figure 14 This is another structural diagram of the battery insulation structure described in this utility model embodiment when a protective cavity is provided; Figure 15 This is an assembly diagram of the battery insulation structure with a protective cavity, cover plate, and electrode assembly as described in this embodiment of the utility model. Figure 16 for Figure 15 A schematic diagram of the structure shown from another perspective; Figure 17 for Figure 16 Sectional view of the middle FF line; Figure 18 This is a schematic diagram of another structure of the battery insulation structure described in this utility model embodiment; Figure 19 This is an assembly diagram of another structure of the battery insulation structure described in this embodiment of the present utility model and the cover plate; Figure 20 for Figure 18 Enlarged view of section G in the middle; Figure 21 This is a cross-sectional view of another structure of the battery insulation structure described in this embodiment of the present invention; Figure 22 for Figure 21 Enlarged view of section I.

[0025] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Structural body; 201. Main body; 2011. Hot melt column; 2012. Through hole; 2013. Notch; 202. Protective part; 2021. Hot melt hole; 20211. First hole; 20212. Second hole; 2022. Protrusion; 2023. Protective cavity; 2024. Notch; 203. Bending section; 2031. Hole opening; 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 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] The welding process between tab 4 and cover plate 1 is a crucial step in ensuring the stability of the battery's electrical connection. However, due to factors such as fluctuations in welding process parameters and insufficient precision of tooling fixtures, the tab 4 often exhibits varying shapes and a chaotic spatial arrangement after welding. The loosely distributed tab 4 is prone to positional misalignment during battery stacking and packaging operations, causing it to be inserted upside down into the electrode assembly 5. Once this happens, the tab 4 will directly connect the positive and negative terminals of the battery, forming a low-resistance path and triggering a short circuit within the electrode assembly 5. The large current generated during the short circuit will cause a rapid increase in localized temperature inside the battery, potentially leading to thermal runaway and catastrophic consequences such as battery fire or explosion.

[0031] Therefore, an embodiment of the first aspect of this application provides a battery insulation structure for isolating a cover plate 1 from an electrode assembly 5. The cover plate 1 is elongated, and electrode posts 3 passing through the cover plate 1 are used to connect with electrode tabs 4 of the electrode assembly 5. The battery insulation structure includes a structural body 2, which includes a main body portion 201 conforming to the cover plate 1, bent portions 203 at both ends along the length of the main body portion 201, and protective portions 202 on each bent portion 203.

[0032] Furthermore, each end protection portion 202 can be folded onto the main body portion 201 via the bending portion 203 and connected to the main body portion 201. The connected protection portion 202 can be positioned on one side of the pole post 3 and abut against the pole tab 4. The length L1 of the bending portion 203 in the width direction of the main body portion 201 and the width L2 of the protection portion 202 satisfy the following relationship: L1 = (0.25 - 0.5)L2.

[0033] Therefore, by allowing the protective part 202 to be positioned on one side of the terminal post 3 and abut against the tab 4 after bending, the position of the tab 4 can be restricted, preventing the tab 4 from being inserted into the electrode group 5 in reverse. This effectively avoids the short circuit problem of the electrode group 5 caused by the tab 4 being inserted in reverse, effectively ensuring the safety performance and normal operation of the battery, thereby improving the safety of the battery.

[0034] By ensuring that the length L1 of the bent portion 203 in the width direction of the main body 201 and the width L2 of the protective portion 202 satisfy L1 = (0.25 - 0.5) L2, the bent portion 203 can be guaranteed to have a reasonable stress-bearing support area. During the bending process of the protective portion 202, this dimensional ratio allows the bent portion 203 to bear a more uniform stress distribution, avoiding the problems of being too long and difficult to bend, or being too short and insufficient support.

[0035] Based on the above overall introduction, specifically, as an exemplary structural form, combined with Figures 1 to 13 As shown, the main body 201 and the cover plate 1 are rectangular shapes that conform to the shape of the object. Furthermore, as... Figure 1 As shown, the terminals 3 are generally two that are spaced apart along the length of the cover plate 1. Therefore, the structural body 2 is provided with two through holes 2012 that correspond one-to-one with the terminals 3. The terminals 3 pass through the through holes 2012 and are then welded to the tabs 4. The structural body 2 is usually sandwiched between the terminals 3 and the cover plate 1 and can be made of the insulating material commonly used in existing batteries. No specific limitation is made here.

[0036] In some exemplary embodiments, the structural body 2 is integrally molded. This arrangement avoids the complex processes and assembly errors caused by assembling multiple parts, reduces connection steps and the number of parts, and makes the plastic manufacturing process more efficient. In addition, the width L1 of the main body 201 is greater than the width L2 of the protective part 202, which can effectively avoid the bending space of the tab 4 and prevent short circuits caused by the insufficient gap between the tab 4 and the battery casing.

[0037] In some of the exemplary implementations, combined with Figure 4 and Figure 5 As shown, at least one side of the bent portion 203 in the thickness direction has a glue-reducing groove K, the bent portion 203 can be bent through the glue-reducing groove K, and the depth h of the glue-reducing groove K and the thickness H of the bent portion 203 satisfy: h = (1 / 3 - 1 / 2) H.

[0038] Here, by providing a reducing groove K on the bent portion 203, the bent portion 203 can have a certain degree of flexibility. When the protective portion 202 is folded relative to the main body portion 201, the reducing groove K can provide a certain deformation space. This effectively avoids bending difficulties or damage to the connection due to excessive rigidity, making the folding operation of the protective portion 202 smoother, while ensuring the stability of the contact effect between the protective portion 202 and the tab 4 after snapping. Setting the ratio of the depth of the reducing groove K to the thickness of the bent portion 203 between 1 / 3 and 1 / 2 allows the bent portion 203 to be easily bent during assembly, while also being able to withstand the pressure of the tab 4 during use without failure.

[0039] In specific implementation, such as Figure 2 As shown, one end of the main body 201 has a connecting protrusion protruding along its thickness direction, and the bent portion 203 is specifically connected to this connecting protrusion. Furthermore, as... Figure 5 As shown, the bent portion 203 is a rectangle extending along the width direction of the main body portion 201. A glue-reducing groove K is provided at the end of the bent portion 203 connected to the main body portion 201, and is located on one side of the bent portion 203 in the thickness direction. Furthermore, the bent portion 203 is located at the middle of the main body portion 201 in the width direction, while the glue-reducing groove K extends through the bent portion 203 along its length direction. The ratio of the depth of the glue-reducing groove K to the thickness of the bent portion 203 can be, for example, 1 / 3, 5 / 12, 1 / 2, or other values.

[0040] It should be noted that, in addition to, Figure 5 As shown, a glue-reducing groove K is provided on one side of the bent portion 203, or glue-reducing groove K can be provided on both sides of the bent portion 203 in the thickness direction. In this case, the ratio of the sum of the depths of the glue-reducing grooves K on both sides to the thickness of the bent portion 203 can be set between 1 / 3 and 1 / 2.

[0041] In some exemplary embodiments, at least one protective portion 202 is provided with a heat-fusion section between it and the main body portion 201, which heat-fuses the protective portion 202 and the main body portion 201 together. Here, by heat-fusing the protective portion 202 and the main body portion 201 together, a better connection strength can be achieved compared to traditional mechanical connections (such as snap-fit ​​or adhesive bonding). Furthermore, this integrated connection avoids loosening of components due to vibration or temperature changes, ensuring that the protective portion 202 will not detach during long-term contact with the tab 4, fundamentally eliminating the structural hazard of the tab 4 being inserted upside down. Moreover, this connection method effectively avoids positional deviations caused by manual assembly, reducing the risk of short circuits caused by assembly errors.

[0042] In some of the exemplary implementations, such as Figure 6 As shown, the heat-fusion section includes a heat-fusion pillar 2011 provided on the main body portion 201 and a heat-fusion hole 2021 provided on the protective portion 202. Furthermore, the protective portion 202 has a protrusion 2022 protruding towards one side of the main body portion 201, and the heat-fusion hole 2021 is provided on the protrusion 2022. By including the heat-fusion pillar 2011 and the heat-fusion hole 2021 in the heat-fusion section, the cooperation between the heat-fusion pillar 2011 and the heat-fusion hole 2021 can form a mechanical pre-positioning structure, allowing for quick alignment between the heat-fusion hole 2021 on the protrusion 2022 and the heat-fusion pillar 2011 of the main body portion 201 before heat fusion.

[0043] After hot melting, the molten plastic material forms a "barb"-shaped locking structure in the gap between the hot-melt holes and the hot-melt pillars, which can effectively prevent the protective part 202 from shifting under the contact force of the tabs 4, especially suitable for the severe vibration scenarios of high-energy-density batteries. By setting the protrusions 2022 on the protective part 202, the contact area between the hot-melt hole 2021 and the hot-melt pillar 2011 can form a locally thickened structure, which can improve the connection between the protective part 202 and the main body 201.

[0044] In specific implementation, such as Figure 1 and Figure 2 As shown, a heat-fusion section is provided between each protective part 202 and the main body part 201, and the heat-fusion pillar 2011 is located at the middle of the main body part 201 in the width direction. The protrusion 2022 is located on the side of the protective part 202 away from the bending part 203. This arrangement effectively suppresses warping deformation of the protective part 202. Furthermore, the protrusion 2022 is cylindrical, and the cross-sections of the heat-fusion pillar 2011 and the heat-fusion hole 2021 are both circular.

[0045] It should be noted that the number and position of the hot melt pillars 2011 and hot melt holes 2021 are not limited to the one shown in the figure, and their number and arrangement can be adjusted according to requirements. For example, the hot melt pillars 2011 can be set as multiple pillars spaced apart in the width direction of the main body 201, or they can be further set as multiple pillars spaced apart along the length direction of the main body 201. In addition, besides providing hot melt sections between each protective part 202 and the main body 201, a hot melt section can also be provided between only one protective part 202 and the main body 201, while the other protective part 202 is connected to the main body 201 by snap-fit ​​or welding.

[0046] In some of the exemplary implementations, such as Figure 6 and Figure 13 As shown, the hot-melt hole 2021 includes a first hole 20211 and a second hole 20212 that are connected to each other. The diameter of the first hole 20211 is smaller than the diameter of the second hole 20212. Moreover, the hot-melt column 2011 is adapted to the first hole 20211. The hot-melt column 2011 has an exposed portion that is exposed in the second hot-melt hole 2021. After hot-melting, the exposed portion fills the second hole 20212 and is flush with the protective portion 202.

[0047] This design allows the hot-melt hole 2021 to be a stepped hole, enabling the hot-melt column 2011 to be initially positioned by an interference fit with the first hole 20211 before hot-melting. After hot-melting, the molten material of the exposed part fills the second hole 20212 to form a "mushroom head" shaped locking protrusion, which can effectively prevent the protective part 202 from twisting and loosening during battery vibration.

[0048] In some exemplary embodiments, the depth P of the hot-melt hole 2021 is between 1.2mm and 5.0mm. This setting avoids excessive hot-melting while ensuring bonding strength, and also effectively prevents structural bulkiness due to an excessively deep hot-melt hole 2021 or connection failure due to an excessively shallow hot-melt hole 2021. In specific implementations, the depth P of the hot-melt hole 2021 can be set to 1.2mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, or other values.

[0049] In some exemplary embodiments, the inner diameter d of the first hole 20211 and the inner diameter D of the second hole 20212 satisfy the condition: Dd = (0.5-3) mm. Setting the inner diameter d of the first hole 20211 and the inner diameter D of the second hole 20212 within this range allows for more controllable flow of the hot-melt material, effectively preventing insufficient filling due to an excessively small difference in hole diameter, or material overflow due to an excessively large difference in hole diameter. In specific implementations, for example, the difference between the inner diameter d of the first hole 20211 and the inner diameter D of the second hole 20212 can be set to 0.5 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, or other values.

[0050] In some of the exemplary implementations, combined with Figures 14 to 17 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 protective part 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 piercing the separator and causing a short circuit in the battery, and improving the safety performance of the battery.

[0051] In some exemplary embodiments, a notch 2024 is provided on the protective portion 202 at the edge of the opening end of the protective cavity 2023, and this notch 2024 is used for the flow of electrolyte. In specific implementations, such as... Figure 14 As shown, the protective cavity 2023 is rectangular, and multiple notches 2024 are provided at intervals on each edge of the protective cavity 2023.

[0052] In some of the exemplary implementations, such as Figure 17 As shown, the depth of the protective cavity 2023 is less than the distance between the protective part 202 after the electrode tab 4 is bent and the electrode group 5, thereby creating a certain gap between the protective cavity 2023 and the electrode group 5.

[0053] 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 made equal to the distance between the protective portion 202 and the electrode assembly 5 after the tab 4 is bent, 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 risk 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.

[0054] It is worth noting that, regarding the battery insulation structure of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 13 As shown, the lower battery insulation structure includes a main body portion 201 conforming to the cover plate 1, bent portions 203 provided at both ends of the main body portion 201 in the length direction, and protective portions 202 provided on each end bent portion 203.

[0055] The structural body 2 is integrally formed, with a glue-reducing groove K on one side of the bent portion 203, allowing the bent portion 203 to be bent through the glue-reducing groove K. Additionally, each protective portion 202 is provided with a hot-melt hole 2021, and each end of the main body 201 is provided with a hot-melt column 2011. The hot-melt hole 2021 includes a first hole 20211 and a second hole 20212 that are connected, with the diameter of the first hole 20211 being smaller than the diameter of the second hole 20212. Each protective portion 202 is hot-melted to the main body 201 through the hot-melt column 2011 and the hot-melt hole 2021.

[0056] The battery insulation structure of this embodiment, by adopting the above structure, allows the protective part 202 to abut against the side of the tab 4 facing away from the cover plate 1 when it is installed on the cover plate 1, forming a physical barrier structure. This effectively ensures that the shape of the tab 4 remains unchanged before and after the electrode assembly 5 is assembled, and can better prevent the tab 4 from being inserted backwards into the electrode assembly 5, thus avoiding a short circuit in the battery and improving battery safety. Moreover, the protective part 202 and the main body part 201 are connected by a heat-fused part, which provides a good connection strength between the two.

[0057] The second aspect of this application also provides a battery insulation structure, the overall structure of which is the same as the battery insulation structure of the first aspect, the main difference being that the structure of the bent portion 203 is different.

[0058] Combination Figures 14 to 18 As shown, the structural body 2 is integrally formed, with the bent portion 203 protruding towards the protective portion 202 on the side closer to the main body 201. The bent portion 203 has a perforated hole 2031. By integrally forming the structural body 2, assembly errors and connection gaps caused by splicing multiple components can be effectively avoided, greatly improving the overall integrity and stability of the structure. This makes the insulation structure less prone to loosening or detachment due to vibration, external impact, or other factors during long-term use, effectively ensuring its isolation effect on the cover plate 1 and the electrode group 5, thereby reducing the probability of battery short circuits and other malfunctions. Simultaneously, integral forming helps simplify the production process, reduce parts processing and assembly steps, improve production efficiency, and reduce production costs.

[0059] The hollow holes 2031 provided on the bent portion 203 not only reduce the weight of the bent portion 203, achieving a lightweight design while ensuring structural strength meets usage requirements, but also help improve battery energy density. Furthermore, during the bending process, the hollow holes 2031 effectively alleviate stress concentration at the bend, making the bending operation smoother and reducing the risk of breakage or cracking of the bent portion 203 due to excessive stress, thus improving product yield.

[0060] In some of the exemplary implementations, such as Figure 16 As shown, the perforated hole 2031 extends along the width direction of the main body 201 to more effectively disperse the stress generated during bending. In a specific implementation, as... Figure 14 and Figure 16 As shown, for example, the bent portion 203 is located in the middle of the width direction of the main body portion 201, and the perforated hole 2031 is also located in the middle of the bent portion 203, and is designed as a long strip extending along the length direction of the bent portion 203. This ensures the connection strength between the protective portion 202 and the main body portion 201 while significantly increasing the toughness of the bent portion 203, facilitating the folding of the protective portion 202 relative to the main body portion 201.

[0061] In some of the exemplary implementations, such as Figure 16 As shown, the length M1 of the perforated hole 2031 is between 2.5mm and 8mm, and the width M2 is between 0.8mm and 3.0mm. By limiting the length M1 of the perforated hole 2031 to 2.5mm-8mm and the width M2 to 0.8mm-3.0mm, it is possible to prevent the perforated hole 2031 from being too small, which would make it difficult to bend the bending part 203, and at the same time, it is possible to prevent the perforated hole 2031 from being too large, which would be detrimental to ensuring the structural strength of the bending part 203. Moreover, the perforated hole 2031 can effectively alleviate the stress concentration of the bending part 203, effectively preventing material cracking due to excessive stress, ensuring that the bending part 203 maintains its structural integrity during repeated bending or long-term use, and extending the service life of the insulation structure.

[0062] It should be noted that, in addition to setting the perforated hole 2031 as a single elongated strip, it can also be set as multiple holes spaced apart along the length of the continuous bending portion 203.

[0063] In some of the exemplary implementations, such as Figure 16As shown, the main body 201 has notches 2013 on both sides of the bending portion 203 along its length. By providing the notches 2013, the material constraint in the connection area between the bending portion 203 and the main body 201 can be reduced, making the bending portion 203 more flexible when bent and requiring less bending force. This design not only facilitates processing and forming during production, improving production efficiency, but also reduces the risk of material fatigue or damage due to excessive bending, ensuring that the insulation structure maintains good performance after multiple bending operations.

[0064] In addition, this embodiment also relates to a battery, the battery casing of which is provided with a battery insulation structure as described above.

[0065] The battery in this embodiment, by setting the battery insulation structure as described above, can have good safety, and at the same time, it can effectively prevent the tab 4 from falling, reduce the space occupied by the tab 4, and thus have good space utilization.

[0066] 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 battery insulation structure for isolating a cover plate from an electrode assembly, the cover plate being elongated, and an electrode post passing through the cover plate for connection with the electrode tabs of the electrode assembly, characterized in that: The structure includes a main body that conforms to the cover plate, bent portions at both ends of the main body along its length, and protective portions on each bent portion. Each protective portion can be folded onto the main body through the bent portion and connected to the main body. The connected protective portion can block one side of the pole post and abut against the pole tab. The length L1 of the bent portion in the width direction of the main body portion and the width L2 of the protective portion satisfy the following condition: L1 = (0.25 - 0.5)L2.

2. The battery insulation structure according to claim 1, characterized in that: The structure body is integrally formed, and the bent portion protrudes towards the protective portion on the side closer to the main body. The bent portion has a hollowed-out hole.

3. The battery insulation structure according to claim 2, characterized in that: The perforated hole extends along the width direction of the main body portion; and / or, The main body has notches located on both sides of the length of the bent portion.

4. The battery insulation structure according to claim 3, characterized in that: The length M1 of the perforated hole is between 2.5mm and 8mm, and the width M2 of the perforated hole is between 0.8mm and 3.0mm.

5. The battery insulation structure according to claim 1, characterized in that: The main body of the structure is integrally formed, and at least one side of the bent portion in the thickness direction has a glue-reducing groove, and the bent portion can be bent through the glue-reducing groove. The depth h of the adhesive reduction groove and the thickness H of the bending portion satisfy the following relationship: h = (1 / 3 - 1 / 2)H.

6. The battery insulation structure according to any one of claims 1 to 5, characterized in that: At least one of the protective parts is provided with a heat-fusion section between the protective part and the main body part, the heat-fusion section heat-fuses the protective part and the main body part together.

7. The battery insulation structure according to claim 6, characterized in that: The hot-melt section includes a hot-melt column disposed on the main body and a hot-melt hole disposed on the protective section; The protective part has a protrusion protruding to one side of the main body, and the hot-melt hole is provided on the protrusion.

8. The battery insulation structure according to claim 7, characterized in that: The hot-melt hole includes a first hole and a second hole that are connected to each other, wherein the diameter of the first hole is smaller than the diameter of the second hole; The hot-melt column is adapted to the first hole, and the hot-melt column has an exposed portion that is exposed in the second hole, and the exposed portion fills the second hole after hot melting.

9. The battery insulation structure according to claim 8, characterized in that: The depth P of the hot-melt hole is between 1.2 mm and 5.0 mm; and / or, The inner diameter d of the first hole and the inner diameter D of the second hole satisfy the following condition: Dd = (0.5-3) mm.

10. A battery, characterized in that: The battery casing is provided with the battery insulation structure as described in any one of claims 1 to 9.

Images