A battery

Abstract

This invention discloses a battery, relating to the field of battery manufacturing technology. The encapsulation film includes a main body and an encapsulation part. The encapsulation part includes a top sealing edge and a first side sealing edge. The top sealing edge includes a second sealing edge and a first sealing edge and a third sealing edge connected to both ends of the second sealing edge. The main body includes a first side surface and a second side surface and a third side surface perpendicularly disposed at both ends of the first side surface. The first side surface is connected to the first sealing edge, the second side surface is connected to the second sealing edge, and the third side surface is in contact with the first side sealing edge. The end of the first sealing edge away from the second sealing edge is connected to the first side sealing edge. The length L1 of the first sealing edge in a second direction, the width L2 of the first sealing edge, and the width L3 of the second sealing edge satisfy the following: when L1≤L3+L2, the transition sealing edge has an open / closed structure; when L1>L3+L2, at least one of the first sealing edge, the transition sealing edge, and the second sealing edge has an open / closed structure. By releasing concentrated stress, the safety and reliability of the battery are improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a battery. Background Technology

[0002] Lithium-ion batteries possess excellent performance characteristics such as high energy storage, strong output, long lifespan, low self-consumption, and high safety, and are widely used in consumer electronic devices such as smartphones and wearable devices. Their technological advantages are particularly prominent in high-end applications that require high energy density and special form factors. As the internal space of consumer electronics products becomes increasingly compact, the requirements for battery energy density and space utilization are constantly increasing. Traditional rectangular cells cannot fully utilize the irregular space inside devices, prompting the development of non-standard shaped pouch cells (i.e., irregularly shaped pouch cells) to flexibly adapt to irregular battery compartment designs and more efficiently utilize the irregular space inside devices, thereby increasing battery capacity while maintaining the overall size of the device.

[0003] To fully utilize the internal height of consumer electronics devices, the top seal of irregularly shaped battery cells is often folded over, effectively reducing the length of the battery and achieving efficient use of internal space. However, the top seal of irregularly shaped batteries typically has a recessed section. During the folding process, this recessed section is prone to stress concentration due to the abrupt change in geometry. When the folding force exceeds the yield limit of the aluminum-plastic film, the top seal may warp, tear, or deform. This not only causes the aluminum-plastic film's encapsulation structure to fail, leading to battery leakage and severely impacting battery reliability, but also, during charging and discharging, the recessed section may expand locally under cyclic stress, causing the aluminum-plastic film's seal to fail, weakening the sealing effect of the encapsulation interface, and thus threatening battery safety.

[0004] Therefore, how to improve the reliability and safety of irregularly shaped batteries while adapting to irregularly shaped spaces is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a battery in which a notch structure is set according to the length of the top sealing edge of the encapsulation film, which can prevent structural failure of the top sealing edge during bending and prevent the sealing edge from failing due to cyclic stress. While improving energy density, it can also improve the safety and reliability of the battery, and solve the technical problem of decreased reliability and safety of existing batteries due to the bending and deformation of the top sealing edge.

[0006] To achieve the above objectives, the present invention provides a battery, including an encapsulation film and a battery cell. The encapsulation film includes a main body and an encapsulation part, and the battery cell is disposed inside the main body. The encapsulation part includes a top sealing edge and a first side sealing edge, and the end face of the main body away from the top sealing edge is the bottom of the battery cell.

[0007] The top sealing edge includes a second sealing edge and a first sealing edge and a third sealing edge that are respectively connected to both ends of the second sealing edge. The second sealing edge extends along a first direction, and the first sealing edge extends along a second direction. The first direction and the second direction are set at an angle. The connection between the first sealing edge and the second sealing edge constitutes a transition sealing edge.

[0008] The main body includes a first side and a second side and a third side respectively located at both ends of the first side; the first side is connected to the first edge seal, the second side is connected to the second edge seal, and the third side is attached to the first edge seal; the end of the first edge seal away from the second edge seal is connected to the first edge seal.

[0009] The main body also includes a fourth side connected to the third sealing edge; the vertical distance from the bottom of the cell to the fourth side is greater than the vertical distance from the bottom of the cell to the first side.

[0010] The length L1 of the first edge seal is the vertical distance from the third side to the second side in the second direction; the width L2 of the first edge seal is the vertical distance from the edge of the first edge seal away from the first side to the first side; the width L3 of the second edge seal is the minimum vertical distance from the edge of the second edge seal away from the second side to the second side.

[0011] The following conditions must be met between L1, L2, and L3:

[0012] When L1≤L3+L2, the transition sealing edge is provided with an open-cut structure;

[0013] When L1>L3+L2, at least one of the first edge seal, transition edge seal, and second edge seal has an open / closed structure.

[0014] In some embodiments, L2 and L3 satisfy the condition: L3>L2>2mm.

[0015] In some embodiments, the notch structure includes a first notch, and the first sealing edge is provided with a first notch, the first notch extending from the edge of the first sealing edge away from the first side surface toward the direction closer to the first side surface;

[0016] The vertical distance from the side edge of the first notch closest to the second sealing edge to the second side edge in the second direction is L4. When L1>L3+L2, L4, L2 and L3 satisfy: L3≤L4≤L3+2*L2.

[0017] In some embodiments, the width of the first notch in the second direction is A1, where A1 satisfies: 0.5mm ≤ A1 ≤ 2mm;

[0018] And / or, the depth of the first notch in the first direction is A2, and A2 and L2 satisfy: A2≥L2-2mm, where, where, the units of A2 and L2 are both mm.

[0019] In some embodiments, the notch structure includes a second notch provided on the second sealing edge, the second notch extending from the edge of the second sealing edge away from the second side surface along a second direction toward the direction closer to the second side surface;

[0020] The width of the second notch in the first direction is A3, and A3 satisfies: 0.5mm≤A3≤2mm;

[0021] And / or, the depth of the second notch in the second direction is A4, and A4 satisfies L3: A4≥L3-2mm, where the units of A4 and L3 are both mm.

[0022] In some embodiments, the notch structure includes a third notch disposed at the transition seal edge;

[0023] The edge of the first sealing edge away from the first side intersects with the edge of the second sealing edge away from the second side to form a transition edge. The third notch extends from the transition edge toward the main body. The third notch includes the first side and the second side, the first side intersects with the first sealing edge, and the second side intersects with the second sealing edge. The width A5 of the third notch is the minimum distance from the first side to the second side, and A5 satisfies: 0.5mm≤A5≤2mm. And / or, the first side and the second side are connected through the third side, and the minimum distance from the transition edge to the third side is A6, and A6 satisfies: A6≥2mm.

[0024] In some embodiments, the transition edge banding is a rounded edge banding;

[0025] The notch structure includes a third notch located on the arc-shaped edge, which includes an inner edge and an outer edge. The third notch extends from the inner edge toward the main body. The radius of the inner edge is R1, and the radius of the outer edge is R2. R1 and R2 satisfy the condition: R1 < R2.

[0026] The third notch includes a first side and a second side located on both sides of the center line of the arc sealing edge, and the first side and the second side are connected by the third side; along the radial direction of the arc sealing edge, the radial distance D from the inner edge to the outer edge satisfies: D>2mm.

[0027] In some embodiments, the third edge is abutted against the fourth side;

[0028] And / or, when L1≤L3+L2, the first edge is bent towards the direction of the first side to form the first arc segment, and the length Z1 of the first arc segment in the second direction is the vertical distance from the edge of the first arc segment away from the second edge to the edge of the second edge away from the second side in the second direction; Z1, L1 and L3 satisfy: Z1= L1-L3;

[0029] And / or, when L1>L3+L2, the first sealing edge bends towards the direction closer to the first side to form a first bent segment. The first bent segment includes a first straight segment that is in contact with the first side and a first arc segment that is connected to the end of the first straight segment that is close to the second sealing edge. The length Z2 of the first arc segment in the second direction is the vertical distance in the second direction from the edge of the first arc segment that is connected to the first straight segment to the edge of the second sealing edge that is away from the second side. Z2 satisfies: 1.5mm≤Z2≤5mm.

[0030] In some embodiments, an insulating buffer block is fixed on the side of the first arc segment away from the first side.

[0031] In some embodiments, the device further includes a first insulating layer, a second insulating layer, a third insulating layer, and a fourth insulating layer disposed sequentially along a second direction;

[0032] The first insulating layer covers the outside of the first straight section, and both ends of the first insulating layer extend along the first direction to both sides of the main body.

[0033] The second insulating layer covers the outside of the insulating buffer block, and both ends of the second insulating layer extend along the first direction to both sides of the main body.

[0034] The third insulating layer covers the second sealing edge, and both ends of the third insulating layer extend to the second side along the second direction;

[0035] The fourth insulating layer covers the outside of the third sealing edge, and both ends of the fourth insulating layer extend along the first direction to both sides of the main body.

[0036] Compared with the prior art, the present invention optimizes the structure of the battery encapsulation film. The optimized encapsulation film includes a main body and an encapsulation part. The main body contains a battery cell, and the encapsulation part includes a top sealing edge and a first side sealing edge. The end face of the main body away from the top sealing edge is the bottom of the battery cell.

[0037] The top sealing edge has an irregular structure, including a second sealing edge and a first sealing edge and a third sealing edge that are respectively connected to both ends of the second sealing edge. The second sealing edge extends along a first direction, and the first sealing edge extends along a second direction. The first direction and the second direction are set at an angle. The connection between the first sealing edge and the second sealing edge constitutes a transition sealing edge.

[0038] The main body includes a first side and a second side and a third side respectively disposed at both ends of the first side; the first side is connected to the first sealing edge, the second side is connected to the second sealing edge, and the third side is attached to the first sealing edge; the end of the first sealing edge away from the second sealing edge is connected to the first sealing edge; the main body also includes a fourth side connected to the third sealing edge; the vertical distance from the bottom of the battery cell to the fourth side is greater than the vertical distance from the bottom of the battery cell to the first side.

[0039] The length L1 of the first edge seal is the vertical distance from the third side to the second side in the second direction; the width L2 of the first edge seal is the vertical distance from the edge of the first edge seal away from the first side to the first side; the width L3 of the second edge seal is the minimum vertical distance from the edge of the second edge seal away from the second side to the second side.

[0040] The following conditions must be met between L1, L2, and L3: when L1≤L3+L2, the transition edge has an open / closed structure; when L1>L3+L2, at least one of the first edge, the transition edge, and the second edge has an open / closed structure.

[0041] To improve battery energy density, the overall height of the battery is reduced by bending the top seal edge, thereby minimizing the ineffective space in the first direction. However, during the bending process, the transition seal edge is prone to stress concentration due to structural abruptness. To address this, the present invention incorporates a notched structure based on the length of the first seal edge, effectively releasing concentrated stress during bending and reducing the risk of deformation such as warping or tearing of the top seal edge. This effectively prevents battery leakage due to encapsulation failure of the encapsulation membrane structure, thus improving battery reliability. Furthermore, during battery charging and discharging, the notched structure also reduces the risk of local expansion of the recessed section of the top seal edge due to cyclic stress, preventing a decrease in the encapsulation strength of the encapsulation membrane and effectively improving the sealing effect of the encapsulation interface, thereby further enhancing battery safety.

[0042] In summary, the present invention sets an open-cell structure based on the length of the top sealing edge of the encapsulation film, thereby improving the energy density while enhancing the safety and reliability of the battery. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a transition sealing edge with a notch structure provided in a specific embodiment of the present invention;

[0045] Figure 2 for Figure 1 A schematic diagram showing the third edge seal being attached to the fourth side.

[0046] Figure 3 for Figure 1 A schematic diagram showing that the first edge of the middle seal has an open-cut structure;

[0047] Figure 4 for Figure 1A schematic diagram showing that the transition edge sealing is a rounded edge sealing;

[0048] Figure 5 for Figure 1 A schematic diagram showing the notched structure in the middle transition edge banding;

[0049] Figure 6 A schematic diagram showing the first notch in the first edge sealing section;

[0050] Figure 7 for Figure 6 A schematic diagram showing the dimensions of the first notch in the middle;

[0051] Figure 8 A schematic diagram showing a second notch for the second edge sealing;

[0052] Figure 9 for Figure 8 A schematic diagram showing the dimensions of the second notch;

[0053] Figure 10 for Figure 5 Enlarged view of a portion of the transition edge banding A;

[0054] Figure 11 for Figure 10 A schematic diagram showing the dimensions of the third gap in the middle;

[0055] Figure 12 A schematic diagram showing that the first edge banding, transition edge banding, and second edge banding all have open-ended structures;

[0056] Figure 13 This is a schematic diagram showing the radius dimensions of the transition edge and the curved side surface;

[0057] Figure 14 This is a schematic diagram showing the radial distance between the third notch and the arc-shaped side surface;

[0058] Figure 15 This is a diagram showing the state when the first edge is bent toward the first side.

[0059] Figure 16 for Figure 15 Another schematic diagram;

[0060] Figure 17 for Figure 15 A schematic diagram showing the dimensions of the first circular arc segment;

[0061] Figure 18 for Figure 15 Another dimensional diagram of the first arc segment in the middle;

[0062] Figure 19 for Figure 15 A schematic diagram showing that the first arc segment in the middle is equipped with an insulating buffer block;

[0063] Figure 20 for Figure 19 A schematic diagram of an insulating buffer block covered with a second insulating layer;

[0064] Figure 21 for Figure 19 A schematic diagram showing that the first straight section and the insulating buffer block are respectively covered with a first insulating layer and a second insulating layer;

[0065] Figure 22 This is a schematic diagram showing the distribution of the first, second, third, and fourth insulating layers;

[0066] Figure 23 for Figure 22 Exploded view.

[0067] The attached figures are labeled as follows:

[0068] 1. Encapsulation film; 2. Electrode; 3. Open-cell structure; 4. Insulating buffer block; 5. First insulating layer; 6. Second insulating layer; 7. Third insulating layer; 8. Fourth insulating layer; and 9. Protective plate.

[0069] Main body 11 and encapsulation part 12;

[0070] First side 111, second side 112, third side 113, fourth side 114 and arc side 115;

[0071] Top sealing edge 121, first side sealing edge 122 and bottom of battery cell 123;

[0072] First edge sealing 1211, second edge sealing 1212 and third edge sealing 1213, transition edge sealing 1214, transition edge 1215 and first bending section 1216;

[0073] The first straight segment 12161 and the first circular segment 12162;

[0074] First gap 31, second gap 32 and third gap 33;

[0075] First side 301, second side 302 and third side 303. Detailed Implementation

[0076] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0078] This invention discloses a battery, including an encapsulation film 1 and a battery cell. The encapsulation film 1 includes a main body 11 and an encapsulation part 12. The battery cell is disposed inside the main body 11. The main body 11 provides a stable space for the battery cell, ensuring that the battery cell is evenly wrapped inside the main body 11. The encapsulation part 12 extends outward from the outer side of the main body 11 to achieve edge sealing.

[0079] As attached Figure 1 As shown, the encapsulation part 12 includes a top sealing edge 121 and a first side sealing edge 122, wherein the top sealing edge 121 and the bottom of the cell 123 are respectively disposed at both ends of the cell along a first direction.

[0080] As attached Figures 1 to 5 As shown, the top sealing edge 121 includes a second sealing edge 1212 and a first sealing edge 1211 and a third sealing edge 1213 respectively connected to both ends of the second sealing edge 1212. The second sealing edge 1212 extends along a first direction, and the first sealing edge 1211 extends along a second direction. The first direction and the second direction are set at an angle. Preferably, the first direction and the second direction are perpendicular, so that the first sealing edge 1211, the second sealing edge 1212 and the third sealing edge 1213 are perpendicularly intersecting each other on the XOY plane. This provides conditions for subsequently setting the notch structure 3 according to the length of the first sealing edge 1211. During the bending process, the stress is guided to be distributed and transferred between different sealing edges, avoiding excessive stress concentration in a single sealing edge and reducing the risk of encapsulation deformation or failure caused by excessive local stress.

[0081] The tab 2 of the battery cell extends from the third sealing edge 1213 along the first direction, so that the tab 2 can avoid the transition sealing edge 1214 formed at the connection between the first sealing edge 1211 and the second sealing edge 1212, thereby avoiding the tab 2 being directly in the stress concentration position. This helps to disperse the local traction effect on the top sealing edge 121 when the tab 2 is led out, and reduces the risk of sealing edge deformation or damage caused by the pull of the tab 2.

[0082] As attached Figures 1 to 5 As shown, the connection between the first sealing edge 1211 and the second sealing edge 1212 forms a transition sealing edge 1214. The transition sealing edge 1214 is recessed towards the main body 11, providing a deformation buffer area for bending operations within a limited space. When the top sealing edge 121 is bent by external force, the transition sealing edge 1214 can guide the stress to achieve a controllable distribution at the corner, avoiding stress concentration at sharp edges and reducing the risk of cracks or tears in the top sealing edge 121 during bending, thereby improving the deformation adaptability of the top sealing edge 121 and the mechanical reliability of the packaging structure.

[0083] As attached Figures 1 to 5 As shown, the main body 11 includes a first side surface 111 and a second side surface 112 and a third side surface 113 respectively perpendicularly disposed at both ends of the first side surface 111. The first side surface 111 is connected to the first sealing edge 1211, providing a direct fixing point for the top sealing edge 121 in the area near the first side sealing edge 122, ensuring that the first sealing edge 1211 can effectively transfer stress to the main body 11 when bent. The second side surface 112 is connected to the second sealing edge 1212, so that the second sealing edge 1212 maintains continuous surface contact with the main body 11 during its extension along the first direction, thereby enhancing the bonding area and connection strength between the top sealing edge 121 and the main body 11.

[0084] As attached Figure 1 As shown, the main body 11 also includes a fourth side surface 114 connected to the third sealing edge 1213; the vertical distance from the bottom 123 of the battery cell to the fourth side surface 114 is greater than the vertical distance from the bottom 123 of the battery cell to the first side surface 111. (See attached diagram) Figures 1 to 4 As shown, the third side 113 is attached to the first side sealing edge 122, which can effectively reduce the space occupied by the first side sealing edge 122 outside the battery, prevent the sealing edge from lifting or expanding outward, and improve the structural compactness of the battery. It can also enhance the connection strength between the encapsulation part 12 and the main body part 11. When the battery is subjected to vibration or impact, the bonding interface can provide continuous support and constraint, reduce the risk of sealing failure caused by the sealing edge lifting or opening, and improve the mechanical stability and sealing reliability of the encapsulation part 12.

[0085] As attached Figures 1 to 5 As shown, the end of the first sealing edge 1211 away from the second sealing edge 1212 is connected to the first side sealing edge 122, realizing the closed connection between the top sealing edge 121 and the side sealing edge at the transition sealing edge 1214, forming a continuous encapsulation path. This can effectively avoid the occurrence of sealing edge breakage or unsealed gaps at the intersection of the main body 11 and the third side 113, thereby improving the sealing continuity and stress resistance of the encapsulation part 12.

[0086] As attached Figure 3 and 4As shown, the length L1 of the first sealing edge 1211 is the vertical distance from the third side 113 to the second side 112 in the second direction; the width L2 of the first sealing edge 1211 is the vertical distance from the edge of the first sealing edge 1211 away from the first side 111 to the first side 111; the width L3 of the second sealing edge 1212 is the minimum vertical distance from the edge of the second sealing edge 1212 away from the second side 112 to the second side 112. Specifically, L1 represents the lateral span of the first sealing edge 1211 extending from the first side sealing edge 122 to the second side 112, L3 represents the protruding width of the second sealing edge 1212 relative to the second side 112, and L2 represents the longitudinal height of the first sealing edge 1211 relative to the first side 111. The three parameters L1, L2, and L3 are independent of each other and can all be measured. This provides an accurate basis for setting the open-cell structure 3 based on the numerical comparison results between L1 and L3 and L2. This allows the arrangement of the open-cell structure 3 to no longer rely on empirical estimation, but to make quantitative decisions based on calculable geometric conditions. This improves the operability of the encapsulation structure optimization and avoids the problem of improper setting of the open-cell structure 3 due to subjective judgment differences.

[0087] The following conditions must be met between L1, L2, and L3:

[0088] When L1≤L3+L2, it means that the geometric space of the transition edge 1214 is relatively compact. In this case, the transition edge 1214 is provided with a notch structure 3, which can concentrate and release the stress generated during bending in a limited space, and avoid excessive stress accumulation at the transition edge 1214 due to insufficient space. This effectively reduces the risk of cracks or tears at the transition edge 1214 and improves the reliability of the packaging structure under compact geometric conditions.

[0089] When L1 > L3 + L2, at least one of the three edge bandings 1211, transition edge banding 1214, and second edge banding 1212 has a notch structure 3, as shown in the attached figure. Figures 6 to 12 As shown, based on the actual geometric shape and stress analysis results, the optimal notch position or combination is selected so that the arrangement of the notch structure 3 can flexibly adapt to different size ratios. When L1 is large, to avoid the problem of insufficient stress release caused by confining the notch structure 3 to a single area of ​​the transition edge 1214, it is permissible to select one or more notch structures 3 in the three areas of the first edge 1211, the transition edge 1214, and the second edge 1212, according to the specific stress distribution characteristics. This achieves effective stress dispersion and release, preventing stress concentration or deformation risks in other areas due to the single placement of the notch structure 3.

[0090] As a preferred embodiment, when L1>L3+L2, only the first sealing edge 1211 is provided with the notch structure 3, as shown in the attached figure. Figure 6 As shown.

[0091] As a preferred embodiment, when L1>L3+L2, only the second sealing edge 1212 is provided with the notch structure 3, as shown in the attached figure. Figure 8 As shown.

[0092] As a preferred embodiment, when L1>L3+L2, only the transition sealing edge 1214 is provided with a notch structure 3, as shown in the attached figure. Figure 10 As shown.

[0093] In a preferred embodiment, when L1>L3+L2, both the first sealing edge 1211 and the transition sealing edge 1214 are provided with a notch structure 3.

[0094] In a preferred embodiment, when L1>L3+L2, both the transition edge 1214 and the second edge 1212 are provided with a notch structure 3.

[0095] In a preferred embodiment, when L1>L3+L2, both the first sealing edge 1211 and the second sealing edge 1212 are provided with a notch structure 3.

[0096] In a preferred embodiment, when L1>L3+L2, the first sealing edge 1211, the transition sealing edge 1214, and the second sealing edge 1212 are all provided with a notch structure 3, as shown in the attached figure. Figure 12 As shown.

[0097] By setting L1>L3+L2 and employing diverse notch arrangement schemes, precise intervention can be achieved for stress concentration in different areas when L1 is relatively large. Specifically, when stress is mainly concentrated in a specific area, the notch structure 3 is set only in that area to avoid excessive notching and damage to the packaging strength. When the stress distribution is more dispersed or there is high stress in multiple areas, the notch structure 3 is set simultaneously in two or three areas to achieve comprehensive stress release. The flexible arrangement of the notch structure 3 ensures the effectiveness of stress release while maintaining the sealing integrity of the packaging part 12 while ensuring the reliability of the packaging structure, thereby further improving the adaptability of packaging structure optimization. The notch structure 3 can be a U-shaped notch or a semi-circular notch, but is not limited to these.

[0098] To improve the energy density of the battery, the overall height of the battery is reduced by bending the top sealing edge 121, thereby reducing the ineffective space in the first direction. However, during the bending process of the top sealing edge 121, the abrupt structural change can easily lead to stress concentration. Therefore, this invention incorporates a notched structure 3 based on the length of the first sealing edge 1211, effectively releasing concentrated stress during bending and reducing the risk of deformation such as warping or tearing of the top sealing edge 121. This effectively prevents battery leakage due to structural failure of the encapsulation portion 12 of the encapsulation film 1, thus improving battery reliability. Furthermore, during battery charging and discharging, the notched structure 3 also reduces the risk of local expansion of the recessed section of the top sealing edge 121 due to cyclic stress, preventing a decrease in the encapsulation strength of the encapsulation film 1 and effectively improving the sealing effect of the encapsulation interface, thereby further enhancing battery safety.

[0099] In summary, the present invention sets the notch structure 3 according to the length dimension of the top sealing edge 121 of the encapsulation film 1, which improves the energy density while enhancing the safety and reliability of the battery.

[0100] As a preferred embodiment, as shown in the appendix Figure 4 As shown, since the battery cell is prone to expansion in the recessed area, a differentiated width design between the first sealing edge 1211 and the second sealing edge 1212 is achieved by setting L2 and L3 to satisfy: L3>L2>2mm, balancing packaging reliability and bending feasibility. The second sealing edge 1212 adopts a wider design to enhance the packaging strength of the easily expandable area and prevent leakage problems caused by local expansion; while the first sealing edge 1211 adopts a narrower design, which is beneficial to the bending operation of the top sealing edge 121 and reduces the difficulty of implementing the bending process.

[0101] As a preferred embodiment, as shown in the appendix Figure 6 As shown, the notch structure 3 includes a first notch 31. The first sealing edge 1211 is provided with a first notch 31. The first notch 31 extends from the edge of the first sealing edge 1211 away from the first side surface 111 towards the side surface 111, allowing the first notch 31 to penetrate into the interior of the first sealing edge 1211 along a first direction. During bending, it provides directional deformation space for stress release of the first sealing edge 1211, guiding stress to concentrate and dissipate at the end of the first notch 31, thereby reducing the risk of the edge of the first sealing edge 1211 warping or tearing due to stress overload. At the same time, the first notch 31 is arranged from the edge of the first sealing edge 1211 away from the first side surface 111, avoiding excessive weakening of the connection root between the first sealing edge 1211 and the first side surface 111, maintaining the connection strength between the first sealing edge 1211 and the main body 11 while achieving stress release.

[0102] As attached Figure 3As shown, the vertical distance from the side of the first notch 31 near the second sealing edge 1212 to the second side surface 112 in the second direction is L4. When L1>L3+L2, L4, L2 and L3 satisfy: L3≤L4≤L3+2*L2. When the first sealing edge 1211 is long, by limiting the length range of L4, the first notch 31 is set close to the transition sealing edge 1214, so that the first notch 31 is close to the stress concentration area. Thus, during the bending process, the first notch 31 can effectively intervene in the stress distribution of the transition sealing edge 1214, guide the stress to concentrate and dissipate to the end of the first notch 31, and avoid insufficient stress release or the transition sealing edge 1214 still having a high risk of cracking due to the first notch 31 being far away from the transition sealing edge 1214. By limiting the range of L4, this invention can ensure that the first notch 31 is not too close to the second sealing edge 1212 and thus not be excessively weakened, and also prevent the first notch 31 from deviating from the transition sealing edge 1214 and thus losing effective intervention against stress concentration, thereby achieving a balance between stress release effect and structural strength protection.

[0103] As a preferred embodiment, as shown in the appendix Figure 7 As shown, the width of the first notch 31 in the second direction is A1, and A1 satisfies: 0.5mm≤A1≤2mm; and / or, the depth of the first notch 31 in the first direction is A2, and A2 and L2 satisfy: A2≥L2-2mm, where, and, where, the units of A2 and L2 are both mm.

[0104] This invention, by limiting the dimensions of the width A1 and depth A2 of the first notch 31, avoids situations where A1 and A2 are too small, resulting in insufficient deformation space within the first sealing edge 1211 and causing stress concentration at the edge of the first sealing edge 1211 during bending, thus preventing inadequate stress release. Conversely, it avoids situations where A1 and A2 are too large, leading to excessive weakening of the first sealing edge 1211 and reducing the risk of leakage due to structural failure under stress or long-term use. By limiting the dimensions of width A1 and depth A2, this invention ensures that the first notch 31 effectively promotes bending stress release while maintaining sufficient structural strength and sealing reliability of the first sealing edge 1211.

[0105] As a preferred embodiment, as shown in the appendix Figure 8As shown, the notch structure 3 includes a second notch 32 located on the second edge 1212. The second notch 32 extends from the edge of the second edge 1212 away from the second side surface 112 along a second direction toward the side surface 112, so that the second notch 32 penetrates deep into the interior of the second edge 1212 along the second direction. During bending, it provides directional deformation space for stress release of the second edge 1212, guiding stress to concentrate and dissipate at the end of the second notch 32, thereby reducing the risk of the edge of the second edge 1212 warping or tearing due to stress overload. At the same time, the second notch 32 is arranged starting from the edge away from the second side surface 112, avoiding excessive weakening of the root area connecting the second edge 1212 and the second side surface 112, which is beneficial to maintain the connection strength between the second edge 1212 and the main body 11 while achieving stress release.

[0106] As a preferred embodiment, the present invention simultaneously provides a first notch 31 and a second notch 32, enabling different sealing areas to release their respective bending stresses. This avoids the problem of excessive weakening of the local structure or insufficient stress release caused by concentrating all stress release on a single notch. Specifically, the first notch 31 guides stress release within the first sealing edge 1211, and the second notch 32 guides stress release within the second sealing edge 1212. The two work together to form a distributed stress release network in multiple sealing areas, thereby further improving the bending resistance reliability and structural integrity of the encapsulation structure during bending.

[0107] As a preferred embodiment, as shown in the appendix Figure 9 As shown, the width of the second notch 32 in the first direction is A3, which satisfies the condition: 0.5mm ≤ A3 ≤ 2mm. This avoids the second notch 32 becoming too narrow (less than 0.5mm, thus reducing the difficulty of subsequent processing and assembly) and also avoids the second notch 32 becoming too wide (more than 2mm, thus preventing a decrease in the structural strength of the second edge seal 1212). Controlling A3 within the range of 0.5mm to 2mm reduces the processing and assembly difficulty of the second notch 32 while improving the structural strength of the second edge seal 1212. The depth of the second notch 32 in the second direction is A4, which satisfies the condition: A4 ≥ L3 - 2 mm, where the units of A4 and L3 are both mm. By limiting the depth A4 of the second notch 32, a decrease in the stiffness of the second edge seal 1212 due to an excessively large A4 is prevented.

[0108] This invention, by limiting the dimensions of the width A3 and depth A4 of the second notch 32, avoids both situations where A3 and A4 are too small, resulting in insufficient deformation space within the second sealing edge 1212 and causing stress concentration at the edge of the second sealing edge 1212 during bending, leading to inadequate stress release, and situations where A3 and A4 are too large, resulting in excessive weakening of the second sealing edge 1212, thus reducing the risk of leakage due to structural failure of the second sealing edge 1212 under stress or long-term use. By limiting the dimensions of the width A3 and depth A4, this invention ensures that the second notch 32 effectively promotes bending stress release while maintaining sufficient structural strength and sealing reliability of the second sealing edge 1212.

[0109] As a preferred embodiment, as shown in the appendix Figure 10 As shown, the notch structure 3 includes a third notch 33 located at the transition sealing edge 1214.

[0110] The edge of the first sealing edge 1211 away from the first side surface 111 intersects with the edge of the second sealing edge 1212 away from the second side surface 112 to form a transition edge 1215. The third notch 33 extends from the transition edge 1215 toward the main body 11, allowing the third notch 33 to penetrate deep into the interior of the transition sealing edge 1214 along the centerline. During bending, the third notch 33 provides directional deformation space for the stress-concentrated area of ​​the transition sealing edge 1214, guiding the stress to concentrate and dissipate at the end of the third notch 33, thereby effectively reducing the risk of cracks or tears at the transition sealing edge 1214 due to stress overload. At the same time, the arrangement of the third notch 33 starting from the transition edge 1215 and extending along the centerline can evenly release the stress on both sides of the transition sealing edge 1214, avoiding uneven stress distribution due to notch offset. While achieving stress release, it effectively maintains the connection strength of the transition sealing edge 1214 area.

[0111] As attached Figure 11As shown, the third notch 33 includes a first side 301 and a second side 302, which are respectively located on both sides of the centerline of the transition sealing edge 1214. The first side 301 intersects with the first sealing edge 1211, and the second side 302 intersects with the second sealing edge 1212. Specifically, the first side 301 intersects with the first sealing edge 1211 at an angle, and the second side 302 intersects with the second sealing edge 1212 at an angle. The width A5 of the third notch 33 is the minimum distance from the first side 301 to the second side 30. A5 satisfies the condition: 0.5mm ≤ A5 ≤ 2mm. This avoids the third notch 33 becoming too narrow due to A5 < 0.5mm, providing sufficient directional deformation space at the transition edge 1214 and preventing stress concentration and cracking at the edge of the transition edge 1214 due to insufficient stress guidance and dissipation at the end of the third notch 33. It also avoids excessive removal of effective material from the transition edge 1214 area due to A5 > 2mm, which would weaken the structural strength of the transition edge 1214, reduce the connection stiffness between the first edge 1211 and the second edge 1212 at the corner, and even lead to seal failure. By limiting A5 to the range of 0.5mm to 2mm, both stress release efficiency and structural strength are balanced.

[0112] As attached Figure 11 As shown, the first side 301 and the second side 302 are connected by the third side 303. The minimum distance from the transition edge 1215 to the third side 303 is A6, which satisfies the condition: A6 ≥ 2mm. This ensures that the third notch 33 has sufficient depth to fully penetrate the stress concentration area along the centerline of the transition edge 1214, providing ample space to accommodate the large plastic deformation generated during bending. This guides the stress to be transferred to the bottom of the third notch 33 and dissipates it evenly, preventing local overload of stress near the transition edge 1215. Simultaneously, it avoids A6 being too small, resulting in the third notch 33 being too shallow and unable to reach the stress concentration area inside the transition edge 1214, leading to limited stress release and potentially brittle fracture or fatigue cracking at the corner edge during use or bending. By setting A6 ≥ 2mm, the crack resistance and reliability of the transition edge 1214 are improved.

[0113] By limiting the width A5 and depth A6 of the third notch 33, the third notch 33 can smoothly guide the stress on both sides of the transition seal 1214 to concentrate and dissipate along the side to the bottom, effectively avoiding abrupt stress changes at the tip or notch root of the transition seal 1214. This effectively reduces the risk of cracking while maximizing the structural integrity and sealing reliability of the transition seal 1214.

[0114] As a preferred embodiment, as shown in the appendix Figure 12As shown, the third notch 33 extends from the edge of the first sealing edge 1211 away from the first side surface 111 towards the side surface 111, and the side edge of the third notch 33 near the second sealing edge 1212 coincides with the side edge of the second sealing edge 1212 away from the second side surface 112; wherein, the third notch 33 includes a first side surface 301 and a second side surface 302 arranged opposite to each other along the second direction, and the second side surface 302 coincides with the side edge of the second sealing edge 1212 away from the second side surface 112, forming a non-open notch structure 3, so that the third notch 33 can achieve stress release while using the edge of the second sealing edge 1212 as the natural boundary of the notch, without the need to additionally cut off the material of the second sealing edge 1212, thereby reducing unnecessary weakening of the structural strength of the second sealing edge 1212. Meanwhile, the third notch 33 extends from the first edge 1211 towards the first side 111, which can provide targeted intervention for stress concentration in the area between the first edge 1211 and the transition edge 1214. The overlapping design of the second side 302 and the edge of the second edge 1212 ensures a smooth transition between the third notch 33 and the second edge 1212, avoiding the generation of new stress abrupt points on the second edge 1212 side, thereby achieving a balance between stress release and structural integrity.

[0115] The width of the third notch 33 is A5, which is the vertical distance from the first side 301 to the second side 302 in the second direction. A5 satisfies: 0.5mm ≤ A5 ≤ 2mm. This avoids the third notch 33 being too narrow due to A5 < 0.5mm, providing sufficient directional deformation space on the first sealing edge 1211 side. This prevents the stress on the first sealing edge 1211 and transition sealing edge 1214 from being insufficiently dissipated during bending, thus avoiding the risk of stress concentration at the edge of the first sealing edge 1211 and causing cracks. It also avoids the first sealing edge 1211 being excessively cut off due to A5 > 2mm, which would weaken the structural strength of the first sealing edge 1211. At the same time, it avoids the third notch 33 being too wide in non-structural situations, which would cause adverse tension on the edge of the second sealing edge 1212. By limiting A5 to the range of 0.5 to 2mm, the structural integrity of the transition sealing edge 1214 between the first sealing edge 1211 and the second sealing edge 1212 is maintained while effectively releasing the stress on the first sealing edge 1211 side.

[0116] The first side 301 and the second side 302 are connected by the third side 303. The depth of the third notch 33 is A6, which is the maximum distance from the edge of the first sealing edge 1211 away from the first side 111 to the third side 303 in the first direction. A6 satisfies: A6≥2mm, ensuring that the third notch 33 has sufficient depth to fully penetrate the stress concentration area from the edge of the first sealing edge 1211 towards the first side 111. This provides sufficient space to accommodate the deformation generated on the first sealing edge 1211 side during bending, guides the stress to be transferred to the bottom of the third notch 33 and dissipates it evenly, and avoids local overload of stress near the edge of the first sealing edge 1211. Since the third notch 33 is an asymmetrical structure and the edges of the second side 302 and the second sealing edge 1212 coincide, the sufficient depth A6 also ensures that the stress release path smoothly transitions from the first sealing edge 1211 side to the edge of the second sealing edge 1212, preventing abrupt changes or reconcentration of stress at the overlapping boundary due to the third notch 33 being too shallow. By setting A6 ≥ 2mm, the third notch 33 of the asymmetric design is ensured to have sufficient depth, thereby improving the reliability of its stress release.

[0117] By limiting the width A5 and depth A6 of the third notch 33, and combining it with the asymmetrical design where the edges of the second side 302 and the second sealing edge 1212 overlap, the concentrated stress in the first sealing edge 1211 and the corner area can be released in a targeted manner. At the same time, the edge of the second sealing edge 1212 is used as a natural boundary to avoid additional material removal. Under the premise of effectively reducing the risk of cracking, the structural strength and sealing reliability of the first sealing edge 1211 and the second sealing edge 1212 are effectively maintained.

[0118] In a preferred embodiment, the third notch 33 extends from the edge of the second sealing edge 1212 away from the second side surface 112 toward the side surface 112, and the side edge of the third notch 33 near the first sealing edge 1211 coincides with the side edge of the first sealing edge 1211 away from the first side surface 111. The third notch 33 includes a first side edge 301 and a second side edge 302 arranged opposite to each other along a first direction. The first side edge 301 coincides with the side edge of the first sealing edge 1211 away from the first side surface 111. While achieving stress relief, the third notch 33 can utilize the edge of the first sealing edge 1211 as the natural boundary of the notch, without the need to additionally cut off the material of the first sealing edge 1211, thereby reducing unnecessary weakening of the structural strength of the first sealing edge 1211. Meanwhile, the third notch 33 extends from the second edge 1212 towards the second side 112, enabling targeted intervention for stress concentration in the area between the second edge 1212 and the transition edge 1214; while the overlapping design of the first side 301 and the first edge 1211 ensures a smooth transition between the third notch 33 and the first edge 1211, avoiding the generation of new stress abrupt change points on the first edge 1211 side, thereby achieving a balance between stress release and structural integrity.

[0119] The width of the third notch 33 is A5, which is the vertical distance from the first side 301 to the second side 302 in the first direction. A5 satisfies: 0.5mm≤A5≤2mm. This avoids the third notch 33 being too narrow due to A5 <0.5mm, making it difficult for the third notch 33 to provide sufficient directional deformation space on the second sealing edge 1212 side. This avoids the risk of stress concentration at the edge of the first sealing edge 1211 and the transition sealing edge 1214 during bending, which could lead to cracks. It also avoids the second sealing edge 1212 being excessively cut off due to A5 >2mm, which would weaken the structural strength of the first sealing edge 1211. At the same time, it avoids the third notch 33 being too wide under the asymmetrical structure, which would cause adverse tension on the edge of the first sealing edge 1211. By limiting A5 to the range of 0.5 to 2 mm, the structural integrity of the transition edge 1214 between the first edge 1211 and the second edge 1212 is maintained while effectively releasing the lateral stress of the first edge 1211.

[0120] The first side 301 and the second side 302 are connected by the third side 303. The depth of the third notch 33 is A6, which is the maximum distance from the edge of the first sealing edge 1211 away from the first side 111 to the third side 303 in the second direction. A6 satisfies: A6≥2mm, ensuring that the third notch 33 has sufficient depth to fully penetrate from the edge of the first sealing edge 1211 into the stress concentration area of ​​the transition sealing edge 1214 in the second direction, providing sufficient space to accommodate the deformation generated during bending, guiding the stress to be transmitted to the bottom of the third notch 33 and dissipating it evenly, and avoiding local overload of stress near the edge of the first sealing edge 1211 or the edge of the second sealing edge 1212. Since the first side 301 of the third notch 33 coincides with the edge of the first sealing edge 1211, and the notch extends from the second sealing edge 1212 towards the second side 112, a sufficient depth A6 ensures that the stress release path smoothly transitions from the second sealing edge 1212 through the corner area to the edge of the first sealing edge 1211, preventing stress from abruptly changing or re-concentrating at the overlapping boundary due to the third notch 33 being too shallow. By setting A6 ≥ 2mm, the third notch 33 of the asymmetrical design is ensured to have sufficient depth, thereby improving the reliability of its stress release.

[0121] By limiting the width A5 and depth A6 of the third notch 33, and combining it with the asymmetrical design where the edges of the first side 301 and the first sealing edge 1211 overlap, the concentrated stress in the second sealing edge 1212 and the corner area can be released in a targeted manner. At the same time, the edge of the first sealing edge 1211 is used as a natural boundary to avoid additional material removal. Under the premise of effectively reducing the risk of cracking, the structural strength and sealing reliability of the first sealing edge 1211 and the second sealing edge 1212 are effectively maintained.

[0122] As a preferred embodiment, as shown in the appendix Figure 13 As shown, the transition edge 1214 provides a smooth transition to the starting position of the arc edge for the third notch 33, avoiding the risk of cracking caused by stress abrupt changes at the starting end of the third notch 33. This helps to maintain the structural integrity and sealing reliability of the transition edge 1214 while achieving stress release.

[0123] As attached Figure 14 As shown, the notch structure 3 includes a third notch 33 located on the arc-shaped edge. The third notch 33 includes an inner edge and an outer edge, which are coaxially distributed along the center line of the arc-shaped edge. The third notch 33 extends from the inner edge along the center line of the arc-shaped edge towards the main body 11, so that the third notch 33 provides directional deformation space for the stress concentration area during bending, guides the stress to concentrate and dissipate at the end of the third notch 33, and avoids insufficient stress release due to the offset of the third notch 33.

[0124] As attached Figure 13As shown, the radius of the inner edge is R1, and the radius of the outer edge is R2. R1 and R2 satisfy the condition: R1 < R2, which creates a geometric gradient in the radial direction of the transition seal 1214 region, with a tighter outer edge and a gentler inner edge. A smaller R1 helps maintain the overall compactness of the outer side of the transition seal 1214, facilitating a reliable sealing fit with the battery casing. A larger R2 makes the inner arc side 115 smoother, effectively reducing local stress concentration caused by abrupt curvature changes during bending of the main body 11. By defining the relationship between R1 and R2, a gradual curvature transition is ensured in the stress transmission path from the top seal 121 to the main body 11, preventing stress from abruptly accumulating at a certain interface. This optimizes the stress distribution within the encapsulation film 1 while ensuring the integrity of the external sealing boundary.

[0125] Meanwhile, as attached Figure 14 As shown, the third notch 33 includes a first side 301 and a second side 302 located on both sides of the center line of the arc-shaped edge. The first side 301 and the second side 302 are connected by the third side 303. Along the radial direction of the arc-shaped edge, the radial distance D from the inner edge to the outer edge satisfies: D>2mm. This ensures that the bottom of the third notch 33 does not excessively penetrate the wall of the arc-shaped edge, avoiding direct damage to the main body 11 due to the excessive depth of the third notch 33, effectively preventing electrolyte leakage. It also provides a material barrier of sufficient thickness between the bottom of the third notch 33 and the arc-shaped side 115, ensuring a safe distance between the bottom of the third notch 33 and the arc-shaped side 115. This allows the peak stress generated during bending to be fully released at the end of the third notch 33, preventing stress transfer to the arc-shaped side 115 and causing secondary cracking.

[0126] By defining R1, R2, and D, and combining a third notch 33 extending along the centerline, this invention optimizes the stress distribution path from a geometric perspective and provides deformation space for stress release from a structural perspective, ensuring the long-term reliability of the electrolyte seal and improving the sealing performance and bending resistance of the transition seal 1214.

[0127] As a preferred embodiment, as shown in the appendix Figures 15-16 As shown, the main body 11 also includes a fourth side 114 connected to the third sealing edge 1213. The third sealing edge 1213 and the fourth side 114 are attached to each other, which can not only make the third sealing edge 1213 fit tightly against the fourth side 114, but also enhance the sealing tightness of the base area of ​​the tab 2, prevent electrolyte leakage from the gap of the tab 2, and improve the sealing reliability of the battery, but also make room for the optimization of the packaging structure by shortening the length of the cell, which is conducive to improving the energy density of the battery.

[0128] As attached Figure 18As shown, when L1≤L3+L2, the first sealing edge 1211 is bent towards the first side 111 to form the first arc segment 12162. The length Z1 of the first arc segment 12162 in the second direction is the vertical distance from the edge of the first arc segment 12162 away from the second sealing edge 1212 to the edge of the second sealing edge 1212 away from the second side 112 in the second direction. Z1, L1 and L3 satisfy: Z1= L1-L3. By controlling the relationship between the length of the first arc segment 12162 after bending and the original size, the problem of excessive bending or insufficient bending caused by improper length control during the bending process is avoided, thereby improving the compactness and assembly accuracy of the overall structure.

[0129] As attached Figure 17 As shown, when L1>L3+L2, the first sealing edge 1211 bends towards the first side 111 to form a first bent segment 1216. The first bent segment 1216 includes a first straight segment 12161 that is in contact with the first side 111 and a first arc segment 12162 that is connected to the end of the first straight segment 12161 that is close to the second sealing edge 1212. The length Z2 of the first arc segment 12162 in the second direction is the vertical distance from the edge of the first arc segment 12162 connected to the first straight segment 12161 to the edge of the second sealing edge 1212 away from the second side 112 in the second direction. Z2 satisfies: 1.5mm≤Z2≤5mm. The length of the first arc segment 12162 after bending is limited to avoid the first sealing edge 1211 from rebounding after bending due to Z2 being too small, which would cause the first sealing edge 1211 to tear. It can also avoid the battery occupying space due to Z2 being too large, which is beneficial to improving the energy density of the battery. This invention limits Z2 to a range of 1.5mm to 5mm, which ensures the stability of the sealing structure after the first sealing edge 1211 is bent, while effectively reducing the occupation of the effective space of the battery, thus achieving a balance between improving bending reliability and energy density.

[0130] As a preferred embodiment, as shown in the appendix Figure 17 As shown, the first straight section 12161 and the first side 111 are fixed by adhesive application, which can effectively reduce the stress concentration between the first sealing edge 1211 and the second sealing edge 1212 after bending, and at the same time reduce the risk of the first sealing edge 1211 rebounding due to the first straight section 12161 not being firmly fixed, thereby improving the stability and reliability of the first sealing edge 1211 structure after bending.

[0131] As a preferred embodiment, as shown in the appendix Figure 19As shown, an insulating buffer block 4 is fixed on the side of the first arc segment 12162 away from the first side surface 111. This block absorbs residual stress generated during bending and subsequent use of the first arc segment 12162, reducing the risk of deformation or warping of the sealing edge due to stress rebound. It also prevents accidental contact between the first arc segment 12162 and the battery interior, avoiding the risk of short circuits. Thus, it enhances the stability of the first sealing edge 1211 and strengthens the electrical safety of the battery. The insulating buffer block 4 is preferably made of foam, but is not limited to this.

[0132] As a preferred embodiment, the top sealing edge 121 is wrapped in sections with adhesive tape, as shown in the attached diagram. Figures 20 to 23 As shown, the battery also includes a first insulating layer 5, a second insulating layer 6, a third insulating layer 7, and a fourth insulating layer 8 arranged sequentially along a second direction; the first insulating layer 5 covers the outside of the first straight section 12161, and both ends of the first insulating layer 5 extend along the first direction to both sides of the main body 11; the second insulating layer 6 covers the outside of the insulating buffer block 4, and both ends of the second insulating layer 6 extend along the first direction to both sides of the main body 11; the third insulating layer 7 covers the outside of the second sealing edge 1212, and both ends of the third insulating layer 7 extend along the second direction to the second side surface 112; the fourth insulating layer 8 covers the outside of the protective plate 9 provided on the third sealing edge 1213, and both ends of the fourth insulating layer 8 extend along the first direction to both sides of the main body 11.

[0133] The first insulating layer 5, the second insulating layer 6, the third insulating layer 7, and the fourth insulating layer 8 independently wrap the first straight section 12161, the first arc section 12162, the second sealing edge 1212, and the third sealing edge 1213, respectively, achieving precise insulation protection for different sections of the top sealing edge 121. Compared to a single integral wrapping, the segmented design not only enhances the connection between the top sealing edge 121 and the main body 11, achieving effective mechanical fixation, but also avoids wrinkling, uneven stretching, or poor local adhesion of the wrapping layer due to differences in deformation or structural height of different sealing edges, thereby improving the adhesion quality and reliability of the insulation wrapping. The first insulating layer 5, the second insulating layer 6, the third insulating layer 7, and the fourth insulating layer 8 can all be adhesive tape, but are not limited to this.

[0134] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0135] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A battery, characterized in that, The device includes an encapsulation film (1) and a battery cell. The encapsulation film (1) includes a main body (11) and an encapsulation part (12). The battery cell is disposed inside the main body (11). The encapsulation part (12) includes a top sealing edge (121) and a first side sealing edge (122). The end face of the main body (11) away from the top sealing edge (121) is the bottom (123) of the battery cell. The top sealing edge (121) includes a second sealing edge (1212) and a first sealing edge (1211) and a third sealing edge (1213) respectively connected to both ends of the second sealing edge (1212). The second sealing edge (1212) extends along the first direction, and the first sealing edge (1211) extends along the second direction. The first direction and the second direction are set at an angle. The connection between the first sealing edge (1211) and the second sealing edge (1212) constitutes a transition sealing edge (1214). The main body (11) includes a first side surface (111) and a second side surface (112) and a third side surface (113) respectively disposed at both ends of the first side surface (111); the first side surface (111) is connected to the first edge seal (1211), the second side surface (112) is connected to the second edge seal (1212), and the third side surface (113) is attached to the first side edge seal (122); the end of the first edge seal (1211) away from the second edge seal (1212) is connected to the first side edge seal (122); The main body (11) also includes a fourth side (114) connected to the third sealing edge (1213); the vertical distance from the bottom of the battery cell (123) to the fourth side (114) is greater than the vertical distance from the bottom of the battery cell (123) to the first side (111); The length L1 of the first sealing edge (1211) is the vertical distance from the third side surface (113) to the second side surface (112) in the second direction; the width L2 of the first sealing edge (1211) is the vertical distance from the edge of the first sealing edge (1211) away from the first side surface (111) to the first side surface (111); the width L3 of the second sealing edge (1212) is the minimum vertical distance from the edge of the second sealing edge (1212) away from the second side surface (112) to the second side surface (112); The following conditions are satisfied between L1, L2, and L3: When L1≤L3+L2, the transition sealing edge (1214) is provided with a notch structure (3). When L1>L3+L2, at least one of the first sealing edge (1211), the transition sealing edge (1214) and the second sealing edge (1212) is provided with a notch structure (3).

2. The battery according to claim 1, characterized in that, The condition L2 and L3 satisfy: L3>L2>2mm.

3. The battery according to claim 1, characterized in that, The notch structure (3) includes a first notch (31), and the first sealing edge (1211) is provided with the first notch (31). The first notch (31) extends from the edge of the first sealing edge (1211) away from the first side surface (111) in a direction close to the first side surface (111). The vertical distance from the side of the first notch (31) near the second sealing edge (1212) to the second side surface (112) in the second direction is L4. When L1>L3+L2, the following conditions are met between L4, L2 and L3: L3≤L4≤L3+2*L2.

4. The battery according to claim 3, characterized in that, The width of the first notch (31) in the second direction is A1, and A1 satisfies: 0.5mm≤A1≤2mm; And / or, the depth of the first notch (31) in the first direction is A2, and A2 and L2 satisfy: A2≥L2-2mm, where, where the units of A2 and L2 are both mm.

5. The battery according to claim 1, characterized in that, The notch structure (3) includes a second notch (32) provided on the second sealing edge (1212), the second notch (32) extending from the edge of the second sealing edge (1212) away from the second side surface (112) along the second direction toward the second side surface (112); The width of the second notch (32) in the first direction is A3, wherein A3 satisfies: 0.5mm≤A3≤2mm; And / or, the depth of the second notch (32) in the second direction is A4, and A4 satisfies the following condition with respect to L3: A4≥L3-2mm, where the units of A4 and L3 are both mm.

6. The battery according to claim 1, characterized in that, The notch structure (3) includes a third notch (33) located on the transition seal (1214). The edge of the first sealing edge (1211) away from the first side surface (111) intersects with the edge of the second sealing edge (1212) away from the second side surface (112) to form a transition edge (1215). The third notch (33) extends from the transition edge (1215) toward the main body (11). The third notch (33) includes a first side surface (301) and a second side surface (302). The first side surface (301) intersects with the first sealing edge (1211). The second side (302) intersects with the second sealing edge (1212); the width A5 of the third notch (33) is the minimum distance from the first side (301) to the second side (302), and A5 satisfies: 0.5mm≤A5≤2mm; and / or, the first side (301) and the second side (302) are connected by the third side (303), and the minimum distance from the transition edge (1215) to the third side (303) is A6, and A6 satisfies: A6≥2mm.

7. The battery according to claim 1, characterized in that, The transition edge seal (1214) is a rounded edge seal; The notch structure (3) includes a third notch (33) provided on the arc-shaped edge, the arc-shaped edge including an inner edge and an outer edge, the third notch (33) extending from the inner edge toward the main body (11); the radius of the inner edge is R1, and the radius of the outer edge is R2; R1 and R2 satisfy the following condition: R1 < R2; The third notch (33) includes a first side (301) and a second side (302) located on both sides of the center line of the arc sealing edge. The first side (301) and the second side (302) are connected by the third side (303). Along the radial direction of the arc sealing edge, the radial distance D from the inner edge to the outer edge satisfies: D>2mm.

8. The battery according to claim 1, characterized in that, The third edge seal (1213) is attached to the fourth side surface (114); And / or, when L1≤L3+L2, the first sealing edge (1211) bends towards the first side surface (111) to form a first arc segment (12162), and the length Z1 of the first arc segment (12162) in the second direction is the vertical distance in the second direction from the edge of the first arc segment (12162) away from the second sealing edge (1212) to the edge of the second sealing edge (1212) away from the second side surface (112); Z1, L1 and L3 satisfy: Z1=L1-L3; And / or, when L1>L3+L2, the first sealing edge (1211) bends towards the first side (111) to form a first bent segment (1216), the first bent segment (1216) includes a first straight segment (12161) that is in contact with the first side (111) and a first arc segment (12162) that is connected to the end of the first straight segment (12161) that is close to the second sealing edge (1212); the length Z2 of the first arc segment (12162) in the second direction is the vertical distance from the edge of the first arc segment (12162) that is connected to the first straight segment (12161) to the edge of the second sealing edge (1212) that is away from the second side (112) in the second direction, and Z2 satisfies: 1.5mm≤Z2≤5mm.

9. The battery according to claim 8, characterized in that, An insulating buffer block (4) is fixed on the side of the first arc segment (12162) away from the first side surface (111).

10. The battery according to claim 9, characterized in that, It also includes a first covering insulation layer (5), a second covering insulation layer (6), a third covering insulation layer (7) and a fourth covering insulation layer (8) arranged sequentially along the second direction; The first covering insulation layer (5) covers the first straight section (12161), and both ends of the first covering insulation layer (5) extend along the first direction to both sides of the main body (11); The second covering insulation layer (6) covers the outside of the insulating buffer block (4), and both ends of the second covering insulation layer (6) extend along the first direction to both sides of the main body (11); The third covering insulation layer (7) covers the second sealing edge (1212), and both ends of the third covering insulation layer (7) extend to the second side surface (112) along the second direction. The fourth covering insulation layer (8) covers the third sealing edge (1213), and both ends of the fourth covering insulation layer (8) extend along the first direction to both sides of the main body (11).

Images