Insulation structure, battery cell and battery device

Abstract

The invention discloses an insulation structure, a battery monomer and a battery device, the insulation structure is used for the battery monomer, the battery monomer comprises a shell and a battery cell arranged in the shell, the insulation structure comprises an insulation film and a support body, the insulation film is configured to be suitable for wrapping the battery cell, the support body and the insulation film are integrally formed, and the support body is arranged in the shell. The supporting body is suitable for supporting the bottom of the battery cell. According to the insulation structure disclosed by the invention, the support body and the insulation film are integrally formed, so that the production process of the battery monomer can be simplified, the assembly efficiency can be improved, the battery monomer is wrapped by the insulation film and the battery monomer is stably supported by the support body, the direct contact between the battery cell and the shell can be avoided, and the electrochemical corrosion of the shell and the friction damage of the battery cell are reduced; the safety of the battery monomers is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an insulating structure, a battery cell, and a battery device. Background Technology

[0002] Sustainable energy plays a vital role in today's society, and lithium-ion batteries, as a core product in the new energy field, are widely used in all aspects of social production and daily life. Therefore, the cycle life and safety of lithium-ion batteries have become important reference indicators. Currently, one of the existing measures to ensure battery safety is to use insulating films and base plates to protect the battery cell pack. The insulating film prevents the cell pack from direct contact with the battery's aluminum casing, preventing casing corrosion or cell short circuits caused by electrochemical reactions; the base plate supports the cell, buffering damage from external impacts and vibrations, reducing safety risks caused by cell deformation under stress, and thus improving battery safety and lifespan. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an insulating structure that simplifies the battery cell manufacturing process, improves assembly efficiency, reduces electrochemical corrosion of the casing, and ensures the safety of the battery cell.

[0004] The present invention also proposes a battery cell having the above-mentioned insulating structure.

[0005] The present invention also proposes a battery device having the above-mentioned battery cells.

[0006] According to a first aspect of the invention, an insulating structure is used for a battery cell, the battery cell including a housing and a cell disposed within the housing, the insulating structure including: an insulating film and a support, the insulating film being configured to enclose the cell, the support being integrally formed with the insulating film, the support being adapted to support the bottom of the cell.

[0007] According to the insulation structure of the present invention, by integrally molding the support body and the insulating film, the production process of the battery cell is simplified, the assembly efficiency is improved, and direct contact between the cell and the casing is avoided, thereby reducing electrochemical corrosion of the casing and frictional damage to the cell and ensuring the safety of the battery cell.

[0008] In some embodiments, the support body is a rectangular plate shape, and the insulating film has a first film segment and a second film segment extending beyond the support body in the width direction. The first film segment and the second film segment are respectively arranged on both sides of the support body in the width direction, and the first film segment and the second film segment are configured to at least cover both sides of the cell in the thickness direction.

[0009] In some embodiments, along the length of the support, the two side edges of the support extend beyond the two side edges of the first membrane segment and the second membrane segment, respectively, and the first membrane segment and the second membrane segment are adapted to cover the two side surfaces of the battery cell in the thickness direction, respectively; or, along the length of the support, the two side edges of the first membrane segment and the second membrane segment extend beyond the two side edges of the support, and the portions of the first membrane segment and the second membrane segment extending beyond the support are adapted to cover the two side surfaces of the battery cell in the length direction.

[0010] In some embodiments, the support body is a hollow plate shape, the inner side of the support body defines a cavity, the support body has a first wall and a second wall arranged opposite to each other in the thickness direction, the first wall has a first through hole communicating with the cavity, and the second wall has a second through hole communicating with the cavity.

[0011] In some embodiments, the equivalent diameters of the first via and the second via are 0.2 mm to 0.5 mm.

[0012] In some embodiments, the first through hole and the second through hole are offset from each other along the length of the support.

[0013] In some embodiments, the number of first through holes is multiple, and the multiple first through holes constitute multiple first hole groups. Each first hole group includes multiple first through holes spaced apart along the width direction of the support body, and the multiple first hole groups are spaced apart along the length direction of the support body. The number of second through holes is multiple, and the multiple first through holes constitute multiple second hole groups. Each second hole group includes multiple second through holes spaced apart along the width direction of the support body, and the multiple second hole groups are spaced apart along the length direction of the support body.

[0014] In some embodiments, the cavity is further provided with a baffle rib, which is located between adjacent first through holes and second through holes in the length direction of the support.

[0015] In some embodiments, in the thickness direction of the support, one end of the baffle is connected to one of the first wall and the second wall, and the other end of the baffle is spaced apart from the other of the first wall and the second wall.

[0016] In some embodiments, the number of the baffles is multiple, and the multiple baffles include a first rib and a second rib. The first rib is connected to the first wall and extends toward the second wall, and the second rib is connected to the second wall and extends toward the first wall. The first rib and the second rib are provided between adjacent first through holes and second through holes. The first rib and the second rib are arranged at intervals in the length direction of the support body. The first rib is disposed close to the first through hole, and the second rib is disposed close to the second through hole.

[0017] In some embodiments, in the thickness direction of the support, the side edge of the first rib facing the second wall extends beyond the side edge of the second rib facing the first wall.

[0018] In some embodiments, the width of the baffle rib in the thickness direction of the support body is 0.5mm-0.8mm; and / or, the length of the baffle rib in the width direction of the support body is 60mm-70mm; and / or, the thickness of the baffle rib in the length direction of the support body is 0.2mm-0.3mm.

[0019] In some embodiments, the thickness of the support is 0.8 mm to 1.5 mm; and / or the thickness of the insulating film is 0.2 mm to 0.3 mm.

[0020] According to a second aspect of the present invention, a battery cell includes: a housing defining a receiving cavity; a battery cell disposed within the receiving cavity; and an insulating structure according to a first aspect of the present invention, wherein the insulating structure is disposed within the receiving cavity, a support is disposed between the battery cell and the bottom wall of the receiving cavity, and an insulating film is wrapped around the outside of the battery cell.

[0021] According to the present invention, the battery cell is manufactured by integrally molding the support body and the insulating film, which simplifies the battery cell production process, improves assembly efficiency, avoids direct contact between the cell and the casing, reduces electrochemical corrosion of the casing and frictional damage to the cell, and ensures the safety of the battery cell.

[0022] The battery device according to a third aspect of the present invention includes a battery cell according to a second aspect of the present invention.

[0023] According to the battery device of the present invention, by integrally molding the support body and the insulating film, the production process of the battery cell is simplified, the assembly efficiency is improved, and direct contact between the cell and the casing is avoided, thereby reducing electrochemical corrosion of the casing and frictional damage to the cell and ensuring the safety of the battery cell.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an insulation structure according to some embodiments of the present invention; Figure 2 This is a schematic diagram of the insulation structure according to other embodiments of the present invention; Figure 3 yes Figure 1 A partial structural diagram of the support shown; Figure 4 yes Figure 3 The front view of the support shown.

[0026] Figure label: 100. Insulation structure; 10. Support structure; 11. Cavity; 111. Reinforcing rib; 1111. First protruding rib; 1112. Second protruding rib; 12. First wall; 121. First through hole; 122. First hole group; 13. Second wall; 131. Second through hole; 132. Second hole group; 20. Insulating film; 21. First film segment; 22. Second film segment. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following is for reference. Figures 1-4 An insulating structure 100 according to an embodiment of the first aspect of the present invention is described.

[0029] like Figure 1 As shown, according to a first aspect embodiment of the present invention, an insulating structure 100 is used for a battery cell, the battery cell including a housing and a cell disposed within the housing, the insulating structure 100 including: an insulating film 20 and a support 10.

[0030] Specifically, the insulating film 20 is configured to wrap the battery cell, and the support 10 is integrally formed with the insulating film 20 and is adapted to support the bottom of the battery cell.

[0031] like Figure 1As shown, the insulating film 20 is used to wrap the surface of the battery cell. It can be made of materials such as PP (polypropylene), PE (polyethylene), PET (polyester), and PVC (polyvinyl chloride). After the insulating film 20 wraps the battery cell, it can prevent the battery cell from directly contacting the casing, so as to play the role of insulation protection, prevent electrochemical corrosion, and reduce frictional damage between the battery cell and the casing.

[0032] like Figure 1 As shown, the material of the support body 10 is the same as that of the insulating film 20. The support body 10 and the insulating film 20 are integrally formed. The support body 10 is arranged at the bottom of the battery cell to directly support the weight of the battery cell and prevent the bottom of the battery cell from directly contacting the bottom wall of the casing. The shape of the support body 10 is adapted to the contour of the bottom of the battery cell. For example, the shape of the support body 10 can be a rectangular plate, a square plate, an arc plate, an irregular plate, etc. Figure 1 As shown, the support body 10 is in the shape of a rectangular plate. The length and width dimensions of the support body 10 are matched with the length and width dimensions of the bottom of the battery cell to prevent the battery cell from shaking inside the casing due to dimensional deviations of the support body 10.

[0033] In this embodiment, the insulating film 20 and the support 10 can be made of PP material. PP material is odorless and non-toxic, with low density and light weight, good temperature resistance, and can adapt to temperature changes during battery cell operation. It also has good toughness, is not easily brittle, and possesses strong chemical stability and corrosion resistance. Furthermore, it has good insulation properties, meeting the insulation requirements of the battery cell. Using the same PP material for both the insulating film 20 and the support 10 allows for integral molding, fully utilizing the insulation and corrosion resistance properties of the PP film. Combined with the supporting and buffering function of the support 10, this avoids direct contact between the battery cell and the casing, provides stable support for the battery cell, and improves the safety performance of the battery cell. By integrally molding the support 10 and the insulating film 20, production steps can be reduced, improving the assembly efficiency of the battery cell. Simultaneously, the integrated structure of the support 10 and the insulating film 20 eliminates gaps between them, increasing the structural strength of the insulation structure 100 and enhancing the stability and reliability of the battery cell.

[0034] According to the embodiment of the present invention, the insulation structure 100, by integrally forming the support body 10 and the insulating film 20, can simplify the battery cell production process and improve assembly efficiency. By using the insulating film 20 to wrap the battery cell and the support body 10 to stably support the battery cell, direct contact between the cell and the casing can be avoided, reducing electrochemical corrosion of the casing and frictional damage to the cell, and ensuring the safety of the battery cell.

[0035] In some embodiments of the present invention, such as Figures 1-4 As shown, the support 10 can be a rectangular plate shape, and the insulating film 20 can have a shape in the width direction of the support 10 (e.g., Figure 1The first membrane segment 21 and the second membrane segment 22 (shown in the front-back direction) extend beyond the support 10. The first membrane segment 21 and the second membrane segment 22 are respectively arranged on both sides of the support 10 in the width direction, and the first membrane segment 21 and the second membrane segment 22 are configured to at least cover the cell in the thickness direction (e.g., in the front-back direction). Figure 1 The two sides of the surface shown in the up-down direction.

[0036] In some examples, such as Figure 1 As shown, the support 10 is a rectangular plate, which is easy to process, has a high material utilization rate, and can be adapted to the structure of most square battery cells, making it highly versatile. The first film segment 21 and the second film segment 22 of the insulating film 20 extend beyond the edge of the support 10 in the width direction, covering at least the front and rear surfaces of the battery cell to form a tightly fitted insulating protective layer, while reducing electrochemical corrosion caused by direct contact between the battery cell side and the casing.

[0037] In some embodiments of the present invention, such as Figure 1 As shown, in the length direction of the support 10 (e.g.) Figure 1 In the left-right direction shown, the two side edges of the support 10 extend beyond the two side edges of the first membrane segment 21 and the second membrane segment 22, respectively. The first membrane segment 21 and the second membrane segment 22 are adapted to cover the two side surfaces of the battery cell in the thickness direction, respectively. Alternatively, in the length direction of the support 10, the two side edges of the first membrane segment 21 and the second membrane segment 22 extend beyond the two side edges of the support 10, and the portions of the first membrane segment 21 and the second membrane segment 22 that extend beyond the support 10 are adapted to cover the two side surfaces of the battery cell in the length direction.

[0038] For example, such as Figure 1 As shown, the two sides of the support 10 can extend beyond the two sides of the first membrane segment 21 and the second membrane segment 22, respectively. The first membrane segment 21 and the second membrane segment 22 are suitable for covering the two sides of the cell in the thickness direction, respectively. When the two sides of the support 10 extend beyond the insulating film 20, it can enhance the bottom support force and structural strength of the insulating structure 100, better support the cell, avoid deformation of the insulating structure 100 due to cell pressure during long-term use, and effectively constrain the position of the first membrane segment 21 and the second membrane segment 22, avoid the insulating film 20 from side offset and curling, ensure the positional stability of the insulating structure 100, thereby improving the structural stability and safety protection capability of the battery cell. It is suitable for scenarios with high requirements for the support strength of the insulating structure 100.

[0039] For example, such as Figure 2As shown, in the left-right direction of the support body 10, the two side edges of the first membrane segment 21 and the second membrane segment 22 extend beyond the two side edges of the support body 10. The portions of the first membrane segment 21 and the second membrane segment 22 extending beyond the support body 10 are suitable for covering the two side surfaces of the battery cell in the length direction, while the portions not extending beyond the support body 10 cover the two side surfaces of the battery cell in the thickness direction. This forms a fully enclosed protective structure for the side surfaces of the battery cell, eliminating the need for additional side insulation components and simplifying the assembly process of the battery cell. Simultaneously, it effectively isolates the battery cell from contact with other components, reducing the risk of short circuits. Furthermore, the larger contact area and higher adhesion between the insulating film 20 and the battery cell further disperse the stress generated during battery cell operation, reducing damage caused by deformation, extending the cycle life of the battery cell, and enhancing safety and reliability. This is suitable for scenarios with high requirements for lightweight and integrated battery cells.

[0040] In some examples, such as Figure 2 As shown, along the length of the support 10, the distance by which the two side edges of the first membrane segment 21 and the second membrane segment 22 extend beyond the two side edges of the support 10 can be 30mm-50mm. For example, the extension distances of the first membrane segment 21 and the second membrane segment 22 can be 30mm, 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, etc. If the extension distance is less than 30mm, the two side surfaces along the length of the cell may not be completely covered, posing a risk of contact between the cell and other components. If the extension distance is greater than 50mm, the insulating film 20 material is wasted, and wrinkles and stacking of the insulating film 20 may occur during assembly, affecting the compactness of the internal structure of the battery cell. By setting the extension distance within the range of 30mm-50mm, the complete protection of the side surfaces along the length of the cell by the insulating film 20 can be ensured, while also taking into account cost and assembly convenience, adapting to the size requirements of most square cells, and improving the versatility of the insulation structure 100.

[0041] In some embodiments of the present invention, such as Figures 1-4 As shown, the support body 10 can be a hollow plate shape, with a cavity 11 defined inside. The support body 10 has a first wall 12 and a second wall 13 arranged opposite each other in the thickness direction. The first wall 12 has a first through hole 121 communicating with the cavity 11, and the second wall 13 has a second through hole 131 communicating with the cavity 11. The support body 10 is a hollow plate-shaped body with a cavity 11 defined inside. The support body 10 includes a first wall 12 and a second wall 13 in the thickness direction. The first wall 12 is closer to the battery cell, and the second wall 13 is closer to the bottom wall of the casing.

[0042] In this embodiment, the first wall 12 and the second wall 13 are respectively provided with a first through hole 121 and a second through hole 131 communicating with the cavity 11. Electrolyte is provided inside the housing. The electrolyte can enter the cavity 11 through the second through hole 131 and then permeate to the bottom of the cell through the first through hole 121, achieving uniform distribution of the electrolyte at the bottom of the cell. By making the support body 10 a hollow plate shape and providing the first through hole 121 and the second through hole 131, the flow and wetting of the electrolyte at the bottom of the cell can be promoted, the cell activation time can be shortened, the weight of the support body 10 can be reduced, the amount of material used can be reduced, the production cost can be lowered, and the battery cell can be made lighter.

[0043] In some embodiments of the present invention, such as Figures 1-4 As shown, the equivalent diameters of the first via 121 and the second via 131 can be 0.2mm-0.5mm. The shapes of the first via 121 and the second via 131 can be circular, elliptical, square, etc., for example, as shown... Figure 1 As shown, both the first through-hole 121 and the second through-hole 131 can be circular holes. The equivalent diameters of the first through-hole 121 and the second through-hole 131 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. When the equivalent diameter is less than 0.2mm, the electrolyte flow resistance increases, which may lead to insufficient wetting of the bottom of the cell and affect the electrochemical performance of the battery cell. When the equivalent diameter is greater than 0.5mm, the structural strength of the support 10 decreases, making it difficult to support the weight of the cell, and the electrode powder of the battery cell is prone to fall to the bottom of the casing through the first through-hole 121 and the second through-hole 131, increasing the risk of corrosion. By setting the equivalent diameters of the first through-hole 121 and the second through-hole 131 within the range of 0.2mm-0.5mm, the structural strength of the support 10 can be ensured while ensuring smooth electrolyte flow, and the falling of electrode powder can be prevented.

[0044] In some embodiments of the present invention, such as Figures 1-4 As shown, the first through-hole 121 and the second through-hole 131 can be staggered along the length of the support 10. The first through-hole 121 and the second through-hole 131 have no overlapping area along the length of the support 10. By staggering the first through-hole 121 and the second through-hole 131, the path of the electrode powder can be extended. Even if a small amount of powder enters the cavity 11 through the first through-hole 121, it is difficult for it to fall into the shell through the second through-hole 131, effectively avoiding electrochemical corrosion of the shell caused by electrode powder shedding. Simultaneously, it can increase the residence time of the electrolyte in the cavity 11, allowing the electrolyte to fully contact the bottom of the battery cell and improving the wetting effect.

[0045] In some embodiments of the present invention, such as Figures 1-4As shown, there can be multiple first through holes 121, and multiple first through holes 121 can form multiple first hole groups 122. Each first hole group 122 includes multiple first through holes 121 spaced apart along the width direction of the support body 10, and the multiple first hole groups 122 are spaced apart along the length direction of the support body 10. There can also be multiple second through holes 131, and multiple first through holes 121 can form multiple second hole groups 132. Each second hole group 132 includes multiple second through holes 131 spaced apart along the width direction of the support body 10, and the multiple second hole groups 132 are spaced apart along the length direction of the support body 10.

[0046] In some examples, such as Figures 1-4 As shown, the number of first through holes 121 can be multiple. For example, there can be 4, 6, 8, 9, 10, 12, 15, 16, 20 or more first through holes 121. Multiple first through holes 121 arranged at intervals along the width direction of the support 10 can form a first hole group 122. The number of first through holes 121 in a first hole group 122 can be 2, 3, 4, 5 or more. The number of first hole groups 122 can be two, three, four, five or more. Multiple first hole groups 122 are arranged at intervals along the length direction of the support 10, such as... Figure 1 As shown, there are 16 first vias 121. Every four first vias 121 are arranged at intervals in the front-to-back direction to form a first hole group 122. There are four groups of first hole groups 122, which are arranged at intervals in the left-to-right direction. By grouping the first vias 121, electrolyte can enter the bottom of the cell from multiple positions simultaneously, ensuring uniform wetting. It also facilitates processing and positioning. The regular arrangement of the first hole groups 122 allows for mass production of the first vias 121, resulting in neater and more aesthetically pleasing vias and improved processing efficiency.

[0047] In some examples, such as Figures 1-4 As shown, the number of second vias 131 can be multiple. For example, there can be 4, 6, 8, 9, 10, 12, 15, 16, 20 or more second vias 131. Multiple second vias 131 arranged at intervals along the width direction of the support 10 can form a second hole group 132. The number of second vias 131 in a second hole group 132 can be 2, 3, 4, 5 or more. The number of second hole groups 132 can be two, three, four, five or more. Multiple second hole groups 132 are arranged at intervals along the length direction of the support 10. Figure 1As shown, there are 16 second vias 131. Every four second vias 131 are arranged at intervals in the front-to-back direction to form a second via group 132. There are four groups of second vias 132, which are arranged at intervals in the left-to-right direction. By grouping the second vias 131, electrolyte can enter the cavity 11 simultaneously from multiple locations, ensuring uniform distribution of the electrolyte within the cavity 11. This also facilitates machining and positioning. The regular arrangement of the second via groups 132 allows for mass production of the second vias 131, resulting in neater and more aesthetically pleasing vias and improved processing efficiency.

[0048] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, a baffle 111 may also be provided within the cavity 11. Along the length of the support 10, the baffle 111 is positioned between adjacent first through holes 121 and second through holes 131. The baffle 111 extends along the width of the support 10, and its length is the same as the width of the support 10. It is arranged between the first through hole 121 and the second through hole 131. The shape of the baffle 111 can be a long strip plate, a trapezoidal plate, an irregular plate, etc., for example, as shown... Figure 3 As shown, the baffle 111 is a long strip-shaped plate extending in the front-to-back direction, which is easy to process. By setting the baffle 111 in the cavity 11, the electrode powder can be further prevented from moving from the first through hole 121 to the second through hole 131, thus preventing the powder from falling into the shell, effectively preventing electrochemical corrosion, and guiding the flow direction of the electrolyte in the cavity 11, so that the electrolyte flows along both sides of the baffle 111, improving the flow uniformity. At the same time, the baffle 111 is equivalent to a reinforcing rib in the cavity 11, enhancing the structural strength of the support 10.

[0049] In some embodiments of the present invention, such as Figure 3 and Figure 4As shown, in the thickness direction of the support 10, one end of the baffle 111 can be connected to one of the first wall 12 and the second wall 13, and the other end of the baffle 111 is spaced apart from the other of the first wall 12 and the second wall 13. For example, one end of the baffle 111 can be connected to the first wall 12 and the other end can be spaced apart from the second wall 13, or one end of the baffle 111 can be connected to the second wall 13 and the other end can be spaced apart from the first wall 12. By arranging the other end of the baffle 111 at intervals with the first wall 12 or the second wall 13, a gap can be left between the baffle 111 and the first wall 12 or the second wall 13. The electrolyte can flow smoothly in the cavity 11 through the gap, avoiding the baffle 111 from obstructing the flow of electrolyte. In addition, arranging the other end of the baffle 111 at intervals with the first wall 12 or the second wall 13 can also give the baffle 111 a certain elastic deformation capability. The baffle 111 forms an elastic buffer structure. When the battery cell is subjected to external impact, the baffle 111 can undergo slight elastic deformation to absorb the impact energy, effectively buffer the impact on the battery cell, and improve the structural reliability.

[0050] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, there can be multiple ribs 111. The multiple ribs 111 include a first rib 1111 and a second rib 1112. The first rib 1111 is connected to the first wall 12 and extends toward the second wall 13. The second rib 1112 is connected to the second wall 13 and extends toward the first wall 12. The first rib 1111 and the second rib 1112 can be provided between adjacent first through holes 121 and second through holes 131. The first rib 1111 and the second rib 1112 are arranged at intervals in the length direction of the support body 10. The first rib 1111 is set close to the first through hole 121, and the second rib 1112 is set close to the second through hole 131.

[0051] In some examples, such as Figure 3 and Figure 4 As shown, the number of first protruding ribs 1111 matches the number of first through holes 121. There can be multiple first protruding ribs 1111; for example, there can be 2, 4, 6, 8, or more. Figure 3 As shown, there are four first ribs 1111. The upper end of each first rib 1111 is connected to the first wall 12 and extends downward toward the second wall 13. The lower end of each first rib 1111 is spaced apart from the second wall 13. The number of second ribs 1112 matches the number of the second through holes 131 groups. There can be multiple second ribs 1112; for example, there can be two, four, six, eight, or more second ribs 1112. Figure 3As shown, there are four second ribs 1112. The lower end of the second rib 1112 is connected to the second wall 13 and extends upward toward the first wall 12. The upper end of the second rib 1112 is arranged at intervals with the first wall 12.

[0052] In some examples, such as Figure 3 and Figure 4 As shown, the first rib 1111 and the second rib 1112 extend along the width direction of the support body 10 and are arranged at intervals along the length direction of the support body 10. The first rib 1111 is arranged near the first through hole 121 on both sides of the first through hole 121, and the second rib 1112 is arranged near the second through hole 131 on both sides of the second through hole 131. For example, as... Figure 3 As shown, four first ribs 1111 extend in the front-back direction and are arranged at intervals on both sides of the first through hole 121 in the left-right direction, and four second ribs 1112 extend in the front-back direction and are arranged at intervals on both sides of the second through hole 131 in the left-right direction.

[0053] In this embodiment, by setting the first protruding rib 1111, a preliminary barrier can be formed near the first through hole 121, intercepting the powder entering the cavity 11 on the side of the first protruding rib 1111 near the first through hole 121, reducing the movement of powder towards the second through hole 131. By setting the second protruding rib 1112, a second barrier can be formed near the second through hole 131. Even if a small amount of powder crosses the first protruding rib 1111, it will be intercepted by the second protruding rib 1112, further reducing the risk of powder falling.

[0054] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, in the thickness direction of the support 10, the edge of the first rib 1111 facing the second wall 13 may extend beyond the edge of the second rib 1112 facing the first wall 12. For example, as... Figure 4 As shown, in the vertical direction, the lower edge of the first rib 1111 is lower than the upper edge of the second rib 1112. The first rib 1111 and the second rib 1112 form an overlapping area. Even if powder enters the cavity 11, it cannot pass through the space between the first rib 1111 and the second rib 1112, thus blocking the path of the powder to the second through hole 131 and avoiding electrochemical corrosion caused by powder falling off the electrode. At the same time, it enhances the overall structural strength of the retaining rib 111. The overlapping area of ​​the first rib 1111 and the second rib 1112 allows the first rib 1111 and the second rib 1112 to support each other when under force, thereby improving the deformation resistance of the retaining rib 111.

[0055] In some examples, such as Figure 3 and Figure 4As shown, in the thickness direction of the support body 10, the distance between the edge of the first rib 1111 facing the second wall 13 and the edge of the second rib 1112 facing the first wall 12 can be 0.2mm-0.5mm. For example, in the thickness direction of the support body 10, the distance between the edges of the first rib 1111 and the second rib 1112 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. When the overlap height is less than 0.2mm, there is still a risk of powder passing through; when the overlap height is greater than 0.5mm, it excessively occupies the space of the cavity 11, increasing the resistance to electrolyte flow. By setting the distance between the edge of the first rib 1111 and the edge of the second rib 1112 in the thickness direction of the support body 10 within the range of 0.2mm-0.5mm, the powder can be completely blocked while ensuring smooth electrolyte flow.

[0056] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the width of the baffle 111 in the thickness direction of the support 10 can be 0.5mm-0.8mm. For example, the width of the baffle 111 in the thickness direction of the support 10 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc. By setting the width of the baffle 111 in the thickness direction of the support 10 within the range of 0.5mm-0.8mm, the baffle 111 can have a sufficient blocking area to cover most of the cavity 11, preventing powder from bypassing the baffle 111 and not affecting the electrolyte flow, while also improving the structural strength of the baffle 111.

[0057] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the length of the baffle 111 in the width direction of the support 10 can be 60mm-70mm. For example, the length of the baffle 111 in the width direction of the support 10 can be 60mm, 61mm, 62mm, 64mm, 65mm, 66mm, 68mm, 70mm, etc. The length of the baffle 111 in the width direction of the support 10 is greater than the length of the first hole group 122 and the second hole group 132, thus forming a complete shield for the first hole group 122 and the second hole group 132, preventing powder from passing through the first hole group 122 and the second hole group 132 and causing electrochemical corrosion. By setting the length of the baffle 111 within the range of 60mm-70mm, it can be ensured that the baffle 111 can completely block the powder.

[0058] In some examples, the two ends of the baffle 111 extend along the width direction of the support 10 and are spaced apart from the two side walls of the cavity 11. The baffle 111 and the side wall of the cavity 11 have a small buffer space reserved, which can adapt to the thermal expansion and contraction caused by temperature fluctuations when the battery cell is working. This avoids the baffle 111 from being directly squeezed by the side wall of the cavity 11, which could lead to the baffle 111 breaking or deforming, or the side wall of the cavity 11 being damaged. While ensuring the protective effect of the powder, it also takes into account the structural adaptability. It is suitable for scenarios where the temperature of the battery cell working environment changes greatly and there are certain requirements for the structural deformation tolerance of the baffle 111.

[0059] In some examples, the two ends of the baffle 111 extend along the width direction of the support 10 to the two side walls of the cavity 11 and connect with the side walls. The baffle 111 achieves complete coverage of the cavity 11, fundamentally eliminating the possibility of powder seeping through the gap between the baffle 111 and the side walls of the cavity 11. This is suitable for battery scenarios where powder protection accuracy is required. At the same time, the close fit between the baffle 111 and the side walls of the cavity 11 can also enhance the overall structural rigidity of the support 10. The baffle 111, as a reinforcing rib, shares the external force with the side walls of the cavity 11, reducing the bending deformation of the support 10 in the width direction and improving the stability of the insulation structure 100.

[0060] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the thickness of the baffle 111 along the length of the support 10 can be 0.2mm-0.3mm. For example, the thickness of the baffle 111 along the length of the support 10 can be 0.2mm, 0.21mm, 0.22mm, 0.24mm, 0.25mm, 0.26mm, 0.28mm, 0.3mm, etc. Along the length of the support 10, if the thickness of the baffle 111 is less than 0.2mm, the baffle 111 will lack strength and be easily bent and deformed. If the thickness of the baffle 111 is greater than 0.3mm, it will increase the resistance to electrolyte flow. By setting the thickness of the baffle 111 within the range of 0.2mm-0.3mm, it can be ensured that the baffle 111 has sufficient structural strength, is not easily deformed, and reduces the resistance to electrolyte flow.

[0061] In some embodiments of the present invention, such as Figures 1-4As shown, the thickness of the support 10 can be 0.8mm-1.5mm. For example, the thickness of the support 10 can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. The thickness of the support 10 can be determined by the weight of the battery cell and the internal space of the casing. When the battery cell is heavy, the support 10 is thicker to ensure support strength; when the internal space of the casing is small, the support 10 is thinner to avoid occupying too much space. By setting the thickness of the support 10 within the range of 0.8mm-1.5mm, stable support can be ensured, preventing bending deformation, avoiding excessive occupation of the internal space of the casing, and ensuring the energy density of the battery cell.

[0062] In some embodiments of the present invention, such as Figures 1-4 As shown, the thickness of the insulating film 20 can be 0.2mm-0.3mm. For example, the thickness of the insulating film 20 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, etc. If the thickness of the insulating film 20 is less than 0.2mm, the structural strength of the insulating film 20 is insufficient, and it is prone to damage during the wrapping or assembly of the battery cell, leading to insulation failure. If the thickness is greater than 0.3mm, the flexibility of the insulating film 20 is reduced, making it difficult for the insulating film 20 to adhere tightly to the surface of the battery cell, and it also increases the overall thickness of the battery cell, affecting the energy density of the battery cell. By setting the thickness of the insulating film 20 within the range of 0.2mm-0.3mm, it is possible to ensure that the insulating film 20 has reliable insulation performance and mechanical strength, while also taking into account good flexibility, tightly wrapping the battery cell, avoiding excessive space occupation, and ensuring the energy density and structural stability of the battery cell.

[0063] In some examples, such as Figure 1 As shown, the first membrane segment 21 and the second membrane segment 22 are respectively connected to the two side surfaces of the support body 10 in the width direction, and in the thickness direction of the support body 10, the first membrane segment 21 and the second membrane segment 22 are disposed close to the upper surface of the support body 10. The end edge of the first membrane segment 21 and the second membrane segment 22 connected to the support body 10 is flush with the upper surface of the support body 10. The connection position of the first membrane segment 21 and the second membrane segment 22 with the support body 10 is integrally formed to form a smooth transition support surface, which is tightly attached to the bottom of the battery cell. The arrangement of the first membrane segment 21 and the second membrane segment 22 close to the upper surface of the support body 10 can shorten the distance that the first membrane segment 21 and the second membrane segment 22 extend to both sides in the thickness direction of the battery cell, and the insulating film 20 directly wraps the side of the battery cell.

[0064] The following describes a battery cell according to a second aspect of the present invention.

[0065] A battery cell according to a second aspect of the present invention includes: a casing, a cell, and an insulation structure 100 according to the first aspect of the present invention described above.

[0066] Specifically, the housing defines a receiving cavity; the battery cell is disposed within the receiving cavity; the insulating structure 100 is disposed within the receiving cavity; the support 10 is disposed between the battery cell and the bottom wall of the receiving cavity; and the insulating film 20 is wrapped around the outside of the battery cell.

[0067] In some examples, the housing defines a receiving cavity. The housing can be made of materials such as aluminum, steel, or composite plastic. The size of the receiving cavity matches the overall size of the battery cell and insulation structure 100 to ensure smooth assembly of the battery cell while avoiding excessive gaps that could cause the battery cell to wobble.

[0068] In some examples, the battery cell is housed within a cavity. The battery cell can be a wound cell, a laminated cell, a square cell, a pouch cell, or other structural forms. The tabs of the battery cell need to be led out from the top of the housing and connected to the external circuit. An insulating and sealing structure needs to be provided between the tabs and the housing to prevent short circuits or electrolyte leakage.

[0069] In some examples, the insulating structure 100 is disposed within the receiving cavity, the support 10 is disposed between the battery cell and the bottom wall of the receiving cavity, directly supporting the battery cell, the bottom of the support 10 is in contact with the bottom wall of the housing, and the insulating film 20 is wrapped around the outside of the battery cell, covering the sides and bottom of the battery cell.

[0070] According to the embodiments of the present invention, the battery cell is integrally formed with the support 10 and the insulating film 20, which simplifies the battery cell production process, improves assembly efficiency, avoids direct contact between the cell and the casing, reduces electrochemical corrosion of the casing and frictional damage to the cell, and ensures the safety of the battery cell.

[0071] The following describes a battery device according to an embodiment of the third aspect of the present invention.

[0072] A battery device according to a third aspect of the present invention includes a battery cell according to the second aspect of the present invention described above.

[0073] According to the battery device of the present invention, by integrally molding the support body 10 and the insulating film 20, the production process of the battery cell is simplified, the assembly efficiency is improved, and direct contact between the cell and the casing is avoided, thereby reducing electrochemical corrosion of the casing and frictional damage to the cell and ensuring the safety of the battery cell.

[0074] The specific processing method of the insulation structure 100 in the above embodiments is described in detail below.

[0075] The support body 10 and the insulating film 20 are injection molded together using the same material. First, a mold is prepared. Based on the rectangular hollow plate structure of the support body 10, the first through hole 121 and the second through hole 131 are staggered and the dimensions of the first film segment 21 and the second film segment 22 of the insulating film 20 are customized into an integrated injection mold. This makes the first film segment 21 and the second film segment 22 extend beyond the support body 10 in the width direction and extend beyond the two sides of the first film segment 21 and the second film segment 22 in the length direction of the support body 10.

[0076] The raw materials are then pretreated, melted, and plasticized to form a homogeneous melt. Next, injection molding is performed to ensure structural stability. After demolding, the molded parts undergo dimensional inspection; qualified parts are considered finished insulation structures.

[0077] The following reference Figures 1-4 A battery device according to a specific embodiment of the present invention is described.

[0078] The battery device includes a battery cell, which includes a casing, a battery cell, and an insulating structure 100. The casing defines a receiving cavity, and the battery cell and the insulating structure 100 are disposed within the receiving cavity. The bottom of the battery cell is in contact with the insulating structure 100, and tabs extend from the top of the battery cell. The insulating structure 100 includes a support body 10 and an insulating film 20. The support body 10 and the insulating film 20 are integrally formed. The support body 10 is disposed between the battery cell and the bottom wall of the receiving cavity, and is adapted to support the bottom of the battery cell. The insulating film 20 wraps around the outside of the battery cell.

[0079] Specifically, such as Figure 3 As shown, the support body 10 is a rectangular hollow plate, and the thickness of the support body 10 is in the range of 0.8mm-1.5mm. A cavity 11 is defined within the inner side of the support body 10. The support body 10 has a first wall 12 and a second wall 13 arranged opposite each other in the vertical direction. The first wall 12 has a first through hole 121 communicating with the cavity 11, and the second wall 13 has a second through hole 131 communicating with the cavity 11. The equivalent diameters of the first through hole 121 and the second through hole 131 are in the range of 0.2mm-0.5mm. There are 16 first through holes 121, forming four groups of first hole groups 122. Each group of first hole groups 122 includes four first through holes 121 spaced apart in the front-back direction. The four groups of first hole groups 122 are spaced apart in the left-right direction. There are also 16 second through holes 131, forming four groups of second hole groups 132. Each group of second hole groups 132 includes four second through holes 131 spaced apart in the front-back direction. The four groups of second hole groups 132 are spaced apart in the left-right direction. The first hole groups 122 and the second hole groups 132 are staggered in the left-right direction.

[0080] like Figure 4As shown, a baffle 111 is provided inside the cavity 11. In the left-right direction, the baffle 111 is located between adjacent first through holes 121 and second through holes 131. The baffle 111 includes a first protruding rib 1111 and a second protruding rib 1112. The first protruding rib 1111 is connected to the first wall 12 and extends downward toward the second wall 13. The second protruding rib 1112 is connected to the second wall 13 and extends upward toward the first wall 12. The first protruding rib 1111 and the second protruding rib 1112 are arranged at intervals in the left-right direction. The first protruding rib 1111 is arranged near the first through hole 121 on the left and right sides of the first through hole 121. The second protruding rib 1112 is arranged near the second through hole 131 on the left and right sides of the second through hole 131. In the up-down direction, the lower edge of the first protruding rib 1111 extends beyond the upper edge of the second protruding rib 1112 by a distance within the range of 0.2mm-0.5mm. The width of the retaining rib 111 in the vertical direction is in the range of 0.5mm-0.8mm, the length in the front-back direction is in the range of 60mm-70mm, and the thickness in the left-right direction is in the range of 0.2mm-0.3mm.

[0081] like Figure 1 As shown, the insulating film 20 wraps around the surface of the battery cell and has a first film segment 21 and a second film segment 22 that extend beyond the support body 10 in the front-back direction. The first film segment 21 and the second film segment 22 are respectively arranged on both sides in the front-back direction, which are suitable for covering the front and back sides of the battery cell respectively. In the left-right direction, the two sides of the support body 10 extend beyond the two sides of the first film segment 21 and the second film segment 22 respectively.

[0082] According to the battery device of the present invention, the integral molding of the support body 10 and the insulating film 20 reduces the number of steps in the production of battery cells and improves assembly efficiency. Furthermore, the staggered arrangement of the cavity 11 of the support body 10 with the first through hole 121 and the second through hole 131 promotes electrolyte flow, achieving good wetting of the battery cell and preventing electrochemical corrosion caused by electrode powder shedding. The baffle 111 further enhances the anti-corrosion effect and improves the structural strength and buffering capacity of the support body 10, better protecting the battery cell from external impacts. The insulating film 20 effectively isolates the battery cell from the casing, reducing the risk of short circuits and ultimately improving the safety and service life of the battery device.

[0083] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An insulating structure (100) for a battery cell, said battery cell comprising a housing and a cell disposed within said housing, characterized in that, The insulating structure (100) includes an insulating film (20) and a support (10), the insulating film (20) being configured to enclose the battery cell, the support (10) being integrally formed with the insulating film (20), and the support (10) being adapted to support the bottom of the battery cell.

2. The insulation structure (100) according to claim 1, characterized in that, The support (10) is a rectangular plate shape, and the insulating film (20) has a first film segment (21) and a second film segment (22) extending beyond the support (10) in the width direction. The first film segment (21) and the second film segment (22) are respectively arranged on both sides of the support (10) in the width direction, and the first film segment (21) and the second film segment (22) are configured to at least cover both sides of the cell in the thickness direction.

3. The insulation structure (100) according to claim 2, characterized in that, Along the length of the support (10), the two side edges of the support (10) extend beyond the two side edges of the first membrane segment (21) and the second membrane segment (22), respectively, and the first membrane segment (21) and the second membrane segment (22) are adapted to cover the two side surfaces of the battery cell in the thickness direction, respectively; or, Along the length of the support (10), the two side edges of the first membrane segment (21) and the second membrane segment (22) extend beyond the two side edges of the support (10), and the portions of the first membrane segment (21) and the second membrane segment (22) extending beyond the support (10) are adapted to cover the two side surfaces of the battery cell along the length.

4. The insulation structure (100) according to claim 2, characterized in that, The support body (10) is a hollow plate shape. The inner side of the support body (10) defines a cavity (11). The support body (10) has a first wall (12) and a second wall (13) arranged opposite to each other in the thickness direction. The first wall (12) is provided with a first through hole (121) communicating with the cavity (11), and the second wall (13) is provided with a second through hole (131) communicating with the cavity (11).

5. The insulation structure (100) according to claim 4, characterized in that, The equivalent diameters of the first via (121) and the second via (131) are 0.2 mm to 0.5 mm.

6. The insulation structure (100) according to claim 4, characterized in that, The first through hole (121) and the second through hole (131) are offset from each other in the length direction of the support (10).

7. The insulation structure (100) according to claim 6, characterized in that, The number of first through holes (121) is multiple, and the multiple first through holes (121) constitute multiple first hole groups (122). Each first hole group (122) includes multiple first through holes (121) spaced apart along the width direction of the support (10), and the multiple first hole groups (122) are spaced apart along the length direction of the support (10). The number of second vias (131) is multiple, and the multiple second vias (131) constitute multiple second hole groups (132). Each second hole group (132) includes multiple second vias (131) spaced apart along the width direction of the support (10), and the multiple second hole groups (132) are spaced apart along the length direction of the support (10).

8. The insulation structure (100) according to claim 6, characterized in that, The cavity (11) is also provided with a baffle (111), and the baffle (111) is located between the adjacent first through hole (121) and the second through hole (131) in the length direction of the support (10).

9. The insulation structure (100) according to claim 8, characterized in that, In the thickness direction of the support (10), one end of the baffle (111) is connected to one of the first wall (12) and the second wall (13), and the other end of the baffle (111) is spaced apart from the other of the first wall (12) and the second wall (13).

10. The insulation structure (100) according to claim 8, characterized in that, The number of the retaining ribs (111) is multiple, and the multiple retaining ribs (111) include a first rib (1111) and a second rib (1112). The first rib (1111) is connected to the first wall (12) and extends toward the second wall (13), and the second rib (1112) is connected to the second wall (13) and extends toward the first wall (12). The first rib (1111) and the second rib (1112) are provided between adjacent first through hole (121) and second through hole (131). The first rib (1111) and the second rib (1112) are arranged at intervals along the length of the support (10). The first rib (1111) is located near the first through hole (121), and the second rib (1112) is located near the second through hole (131).

11. The insulation structure (100) according to claim 10, characterized in that, In the thickness direction of the support (10), the side edge of the first rib (1111) facing the second wall (13) extends beyond the side edge of the second rib (1112) facing the first wall (12).

12. The insulation structure (100) according to claim 8, characterized in that, In the thickness direction of the support (10), the width of the baffle (111) is 0.5mm-0.8mm; and / or, in the width direction of the support (10), the length of the baffle (111) is 60mm-70mm; and / or, in the length direction of the support (10), the thickness of the baffle (111) is 0.2mm-0.3mm.

13. The insulating structure (100) according to any one of claims 1-12, characterized in that, The thickness of the support (10) is 0.8 mm to 1.5 mm; and / or the thickness of the insulating film (20) is 0.2 mm to 0.3 mm.

14. A single battery cell, characterized in that, include: A housing that defines a receiving cavity; The battery cell is disposed within the receiving cavity; According to any one of claims 1-13, the insulating structure (100) is disposed in the receiving cavity, the insulating film (20) wraps around the outside of the battery cell, and the support (10) is disposed between the battery cell and the bottom wall of the receiving cavity.

15. A battery device, characterized in that, Includes the battery cell according to claim 14.

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