Pouch battery structure and battery pack fixing structure thereof

Abstract

The utility model relates to a kind of soft package battery structure and its battery pack fixing structure, soft package battery includes electric core and packing bag, electric core includes electrode assembly and tab, packing bag is equipped with electric core cavity, electrode assembly is built-in in electric core cavity, tab is stretched to the outside of packing bag from electrode assembly, the edge of packing bag is equipped with edge sealing to form sealed space in packing bag interior, packing bag middle part is equipped with partition seal in the side close to electric core cavity, partition seal and the edge of adjacent enclosure region form air bag, gap is left between partition seal and the edge close to electric core cavity to form air hole, air hole is communicated with electric core cavity and air bag.Gas bag is equipped with annular seal in middle area hollow, or air bag is divided into multiple air bags, which are communicated, and form a gap between adjacent air bags, which is open on one side.The design of the gas bag can improve the long cycle and safety performance of the soft package battery. The design of the annular seal or the gap provides a suitable and uniform restraining force during the assembly of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a soft-pack battery structure and its battery pack fixing structure. Background Technology

[0002] With the increasing demand for long-cycle and high-safety batteries from the new energy industry, pouch batteries, due to their flexible packaging, lightweight design, uniform heat dissipation, and low cost, have become an important research direction in fields requiring long-cycle and high-safety applications, such as medical implants, portable power tools, robots, large-scale energy storage devices, and home backup power supplies. In these electronic devices, pouch batteries require power supply solutions with long cycle life, adaptability to irregular shapes, and high safety. However, limitations in the packaging structure materials of pouch batteries have resulted in lower safety performance and longer cycle life compared to batteries with metal casings.

[0003] Pouch batteries typically consist of a battery cell and a packaging bag covering the cell. During normal use, pouch batteries produce gas. Over time, this gas can accumulate and cause the battery to bulge. Once bulging occurs, the battery's cycle performance decreases rapidly. If the gas continues to increase, the outer packaging may rupture, leading to electrolyte leakage and posing a significant safety hazard. To address the bulging problem caused by gas in pouch batteries, current technologies often use air vents in the packaging bag to release the gas.

[0004] During use, to meet voltage / capacity requirements, multiple individual cells are connected in series or parallel to form a battery pack. The battery pack is formed by stacking multiple pouch cells and applying a certain constraint to ensure battery performance. When forming a battery pack for pouch cells with air pockets, it is necessary to consider the rationality of the fixed points of the constraint force, and to provide a suitable and uniform constraint force to the battery pack without affecting the function of the air pockets. This case arises from this need. Utility Model Content

[0005] This utility model first discloses a soft-pack battery structure, which can prevent the battery from bulging during use and facilitate the provision of appropriately sized and uniform constraint force when forming the battery pack.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A soft-pack battery structure includes a battery cell and a packaging bag. The battery cell includes an electrode assembly and tabs. The packaging bag has a battery cell cavity, in which the electrode assembly is built. The tabs extend from the electrode assembly to the outside of the packaging bag. A sealing edge is provided around the edge of the packaging bag to form a sealed space inside the packaging bag. A partition seal is provided in the middle of the packaging bag on the side adjacent to the battery cell cavity. The partition seal and the adjacent sealing edge form an air bag. A gap is left between the partition seal and the sealing edge near the battery cell cavity to form an air hole, which connects the battery cell cavity and the air bag. An annular seal is provided inside the air bag, and the middle area of ​​the annular seal is hollowed out.

[0008] Furthermore, the sealing edge is divided into a first sealing edge, a second sealing edge, a third sealing edge, and a fourth sealing edge. The first sealing edge is opposite to the third sealing edge, and the second sealing edge is opposite to the fourth sealing edge. A portion of the first sealing edge, a portion of the second sealing edge, a portion of the third sealing edge, and the partition seal together enclose the cell cavity. The partition seal, another portion of the first sealing edge, the fourth sealing edge, and another portion of the third sealing edge together enclose and form an air bag. The electrode tab extends from one side of the first sealing edge to the outside of the packaging bag. One end of the partition seal is connected to the third sealing edge, and a gap is left between the other end of the partition seal and the first sealing edge to form an air hole. A ring seal is set between the partition seal and the fourth sealing edge.

[0009] Furthermore, the sealing edge is divided into a fifth sealing edge, a sixth sealing edge, a seventh sealing edge, and an eighth sealing edge. The fifth sealing edge is opposite to the seventh sealing edge, and the sixth sealing edge is opposite to the eighth sealing edge. The electrode tab extends from one side of the fifth sealing edge to the outside of the packaging bag. The two sides of the battery cell cavity are respectively provided with partition seals. The middle part of the fifth sealing edge, the partition seals on both sides, and the middle part of the seventh seal together enclose the battery cell cavity. A part of the fifth sealing edge, a part of the sixth sealing edge, a part of the seventh sealing edge, and a partition seal on one side together enclose to form a first air bag. The other part of the fifth sealing edge, the other part of the eighth sealing edge, the other part of the seventh sealing edge, and a partition seal on the other side together enclose to form a second air bag. One end of each partition seal on both sides is connected to the seventh sealing edge, and the other end of each partition seal on both sides leaves a gap with the fifth sealing edge to form an air hole. Both the first air bag and the second air bag are provided with annular seals.

[0010] Furthermore, the sealing edge is divided into a ninth sealing edge, a tenth sealing edge, an eleventh sealing edge, a twelfth sealing edge, a thirteenth sealing edge, and a fourteenth sealing edge. The ninth sealing edge is opposite to the eleventh sealing edge, the tenth sealing edge is opposite to the thirteenth sealing edge, the thirteenth sealing edge is shorter than the tenth sealing edge, the eleventh sealing edge and the thirteenth sealing edge are connected by an L-shaped twelfth sealing edge, and the ninth sealing edge and the thirteenth sealing edge are connected by an L-shaped fourteenth sealing edge. The twelfth sealing edge and the fourteenth sealing edge are axially symmetrical to each other. The partition seal is set on one side of the cell cavity. The electrode tab extends from one side of the ninth sealing edge to the outside of the packaging bag. The partition seal, a part of the twelfth sealing edge, the thirteenth sealing edge, and a part of the fourteenth sealing edge together form an air bag. One end of the partition seal is connected to the twelfth sealing edge, and a gap is left between the other end of the partition seal and the fourteenth sealing edge to form an air hole. The two sides of the outside of the air bag are respectively formed with clearance notches.

[0011] Based on the above-mentioned soft-pack battery structure, this utility model also discloses a battery pack fixing structure, including multiple soft-pack battery structures, a first support plate, a second support plate, a screw, and a nut. Through holes are provided at both opposite ends of the first support plate and both opposite ends of the second support plate. Multiple soft-pack battery structures are stacked sequentially to form a battery pack. The tabs of each soft-pack battery structure in the battery pack face the same direction. A first support plate is provided on one side of the battery pack, and a second support plate is provided on the other side. The first and second support plates clamp and fix the battery pack. The first and second support plates are connected by a screw, and nuts are fitted at both ends of the screw. The screw on at least one side of the first and second support plates passes through the annular seal hole of each soft-pack battery structure.

[0012] This utility model also discloses another soft-pack battery structure, the specific technical solution of which is as follows:

[0013] A soft-pack battery structure includes a battery cell and a packaging bag. The battery cell includes an electrode assembly and tabs. The packaging bag has a battery cell cavity, in which the electrode assembly is built. The edge of the packaging bag is sealed to form a sealed space inside the packaging bag. A partition seal is provided in the middle of the packaging bag on the side adjacent to the battery cell cavity. The partition seal and the adjacent sealing edge form multiple interconnected air bags. The sealing edges between adjacent air bags are curved, forming a clearance gap with only one side open on the outside of the sealing edges between adjacent air bags. A gap is left between the partition seal and the sealing edge near the battery cell cavity to form an air hole, which connects the battery cell cavity and the air bag.

[0014] Furthermore, the sealing edge is divided into a fifteenth sealing edge, a sixteenth sealing edge, a seventeenth sealing edge, an eighteenth sealing edge, a nineteenth sealing edge, and a twentieth sealing edge. The fifteenth sealing edge is opposite to the seventeenth sealing edge, and the sixteenth sealing edge is opposite to the eighteenth sealing edge. The electrode tab extends from one side of the fifteenth sealing edge to the outside of the packaging bag. A portion of the fifteenth sealing edge, a portion of the sixteenth sealing edge, a portion of the seventeenth sealing edge, and the partition seal together enclose the cell cavity. The eighteenth sealing edge is divided into multiple segments with intervals. Adjacent segments of the eighteenth sealing edge are connected by two nineteenth sealing edges and one twentieth sealing edge. The twentieth sealing edge is curved and close to the partition seal with a gap between them.

[0015] Based on the above-mentioned soft-pack battery structure, this utility model also discloses a battery pack fixing structure, including multiple soft-pack battery structures, a first support plate, a second support plate, a screw, and a nut. Through holes are provided at both opposite ends of the first support plate and both opposite ends of the second support plate. Multiple soft-pack battery structures are stacked sequentially to form a battery pack. The tabs of each soft-pack battery structure in the battery pack face the same direction. A first support plate is provided on one side of the battery pack, and a second support plate is provided on the other side. The first and second support plates clamp and fix the battery pack. The first and second support plates are connected by a screw, and nuts are fitted at both ends of the screw. The screw on at least one side of the first and second support plates passes through the clearance notch of each soft-pack battery structure.

[0016] The pouch battery structure designed in this invention forms an air bag on the packaging bag. This allows gas generated in the cell cavity during normal use of the pouch battery to be released into the air bag through air holes, preventing gas generation from affecting the normal operation of the pouch battery and improving its long-cycle and safety performance. Furthermore, this invention considers the needs of pouch battery pack assembly. A combination of support plate, screw, and nut provides the necessary constraint force to the battery pack. This support assembly structure can also adjust the magnitude of the constraint force as needed. By providing a perforated annular seal or clearance notch in the area where the air bag is located, this invention allows for the screw to pass through, thereby reducing the size of the support plate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the soft-pack battery structure in Example 1;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the soft-pack battery structure in Example 2;

[0020] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0021] Figure 5 This is a schematic diagram of the soft-pack battery structure in Example 3;

[0022] Figure 6 for Figure 5 Enlarged view at point C;

[0023] Figure 7 This is a schematic diagram of the soft-pack battery structure in Example 4;

[0024] Figure 8 for Figure 7 Enlarged view at point D;

[0025] Figure 9 for Figure 7 Enlarged view at point E in the middle;

[0026] Figure 10 This is a state diagram of the soft-pack battery in Example 1 after the first support plate is installed when forming the battery pack;

[0027] Figure 11 for Figure 10 A structural diagram of the other side;

[0028] Figure 12 To be Figure 11 This is a diagram showing the state after the second support plate has been installed.

[0029] Figure label:

[0030] 1. Electrode tab; 2. Cell cavity; 3. Air bag; 4. First sealing edge; 5. Second sealing edge; 6. Third sealing edge; 7. Fourth sealing edge; 8. Partition seal; 9. Circular seal; 10. Air hole; 11. Fifth sealing edge; 12. Sixth sealing edge; 13. Seventh sealing edge; 14. Eighth sealing edge; 15. Ninth sealing edge; 16. Tenth sealing edge; 17. Eleventh sealing edge; 18. Twelfth sealing edge; 19. Thirteenth sealing edge; 20. Fourteenth sealing edge; 21. Relief notch; 22. Fifteenth sealing edge; 23. Sixteenth sealing edge; 24. Seventeenth sealing edge; 25. Eighteenth sealing edge; 26. Nineteenth sealing edge; 27. Twentieth sealing edge; 28. First support plate; 29. ​​Screw; 30. Second support plate; 31. Nut. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0032] Example 1: As Figure 1 and Figure 2As shown, the soft-pack battery structure of this embodiment includes a battery cell and a packaging bag. The battery cell includes an electrode assembly and tabs 1. A battery cell cavity 2 is located near the left side of the packaging bag. The electrode assembly is housed within the battery cell cavity 2, with the tabs 1 extending from the electrode assembly to the outside of the packaging bag. The packaging bag is cut into a rectangular shape, and a sealing edge is provided around its four edges to create a sealed space inside the bag. Wherein, as... Figure 1 As shown, the surrounding edges are divided into a first edge 4, a second edge 5, a third edge 6, and a fourth edge 7. The tab 1 extends from one side of the first edge to the outside of the packaging bag. The first edge 4 is opposite to the third edge 6, and the second edge 5 is opposite to the fourth edge 6. The cell cavity 2 is located near the left side of the first edge 4, and a partition seal 8 is formed at the right edge of the cell cavity 2. The bottom end of the partition seal 8 is connected to the third edge 6, and a gap is left between the top end of the partition seal 8 and the first edge 4 to form an air hole 10. The first edge 4, the second edge 5, the third edge 6, and the partition seal 8 together enclose the cell cavity 2. The partition seal 8, the first edge 4, the fourth edge 7, and the third edge 6 together form an air bag 3. The air hole 10 connects the cell cavity 2 to the inside of the air bag 3. When the soft-pack battery is in use, the gas generated in the cell cavity 2 can be discharged into the air bag 3 through the air hole 10. In this embodiment, an annular seal 9 is also provided in the area where the air bag 3 is located. The packaging bag inside the annular seal 9 needs to be removed to form a perforated hole. In this embodiment, the annular seal 9 is located on the side close to the partition seal 8, which is more conducive to reducing the lateral width of the support plate.

[0033] Based on the soft-pack battery structure described in this embodiment, this embodiment also discloses a battery pack fixing structure, such as... Figures 10 to 12 As shown, the battery pack includes multiple pouch battery structures, a first support plate 28, a second support plate 30, a screw 29, and a nut 31. Both the first support plate 28 and the second support plate 30 are rectangular, with through holes near their left and right edges. Multiple pouch batteries are stacked sequentially to form a battery pack, with the tabs 1 of each pouch battery structure facing the same direction. There are two ways to arrange the pouch battery structures in the battery pack: the first is to have the front faces of each pouch battery structure facing the same direction, so that the annular seals 9 of each pouch battery structure correspond; the second is to arrange the pouch battery structures alternately on their front and back sides, meaning that the annular seals 9 of adjacent pouch battery structures do not correspond. The first support plate 28 is placed at the front end of the battery pack, and the second support plate 30 is placed at the rear end of the battery pack, so that the first support plate 28 and the second support plate 30 clamp the battery pack. The through holes at the right ends of the first support plate 28 and the second support plate 30 must correspond to the annular seals 9 of the pouch batteries. Screws 29 are inserted into the through holes at both ends of the first support plate 28 and the second support plate 30, and finally nuts 31 are fitted onto both ends of the screws 29 for fixation. Figure 11As shown, when the first arrangement is adopted, the screw 29 on the side away from the annular seal 9 is located on the outside of the battery pack, while the screw 29 on the side closer to the annular seal 9 passes through the perforated hole of the annular seal 9 of each pouch battery in sequence. When the second arrangement is adopted, the screws 29 on both sides pass through the perforated hole of the annular seal 9 of each pouch battery.

[0034] Example 2: As Figure 3 and Figure 4 As shown, this embodiment is structurally similar to Embodiment 1, with the main difference being that the cell cavity 2 in this embodiment is located in the middle of the packaging bag, and partition seals 8 are formed on both the left and right sides of the cell cavity 2, thus forming an air bag 3 on each of the left and right sides of the cell cavity 2. This embodiment focuses on explaining the differences; for details not specifically explained, please refer to Embodiment 1. Figure 3 As shown, the surrounding edges are divided into a fifth edge 11, a sixth edge 12, a seventh edge 13, and an eighth edge 14. The tab 1 extends from the fifth edge 11 to the outside of the packaging bag. The fifth edge 11 is opposite to the seventh edge 13, and the sixth edge 12 is opposite to the eighth edge 14. The bottom ends of the two side partition seals 8 are connected to the seventh edge 13, and the top ends of the two side partition seals 8 are separated from the fifth edge 11 to form air holes 10. The fifth edge 11, the seventh edge 13, and the two side partition seals 8 together enclose the battery cell cavity 2, and the air holes 10 connect the battery cell cavity 2 to the inside of the air bag 3. In this embodiment, annular seals 9 are provided in the areas where the two air bags 3 are located. The packaging bag inside the annular seal 9 needs to be removed to form a hollow hole. The annular seals 9 on both sides of the battery cell cavity 2 are located on the side close to the partition seal 8.

[0035] Based on the soft-pack battery structure described in this embodiment, this embodiment also discloses a battery pack fixing structure, which is similar to the battery pack fixing structure given in Embodiment 1. This embodiment only describes the differences; for details not specifically described, please refer to Embodiment 1. Reference Figures 10 to 12 As shown, in this embodiment, the annular seals 9 on the left and right sides of the battery pack correspond to each other, and the screws 29 at both ends of the first support plate 28 and the second support plate 30 need to pass through the corresponding annular seal 9 of each soft pack battery.

[0036] Example 3: As Figure 5 and Figure 6 As shown, this embodiment is structurally similar to Embodiment 1, with the main difference being that the longitudinal length of the air bag 3 in this embodiment is different from that of the cell cavity 2. Specifically, the air bag 3 is located in the middle of the right side of the cell cavity 2, allowing the upper and lower parts of the air bag 3 to form a clearance notch 21 respectively. This embodiment focuses on explaining the differences; for details not specifically explained, please refer to Embodiment 1. Figure 5As shown, the four sides are sealed with edge banding: edge 15 (ninth), edge 16 (tenth), edge 17 (eleventh), edge 18 (twelfth), edge 19 (thirteenth), and edge 20 (fourteenth). Edge 15 and edge 17 are opposite each other, and edge 16 and edge 19 are opposite each other. Edge 19 is shorter than edge 16. Edge 17 and edge 19 are connected by an L-shaped edge 18, and edge 15 and edge 19 are connected by an L-shaped edge 20. Edges 18 and 20 are symmetrical about each other vertically. The tab 1 extends from one side of edge 15 to the outside of the packaging bag. The bottom of the partition seal 8 is connected to edge 18, and a gap is left between the top of the partition seal 8 and edge 20 to form an air hole 10, which connects the battery cell cavity 2 and the inside of the air bag 3. An annular seal 9 is set in the area where the air bag 3 is located. The packaging bag inside the annular seal 9 needs to be removed to form a perforated hole. The annular seal 9 is set on the side close to the partition seal 8. Since the thirteenth sealing edge 19 is relatively short, the upper and lower parts of the air bag 3 formed in this embodiment naturally form concave clearance notches 21.

[0037] Based on the soft-pack battery structure described in this embodiment, the battery pack fixing structure disclosed in this embodiment is similar to the battery pack fixing structure given in Embodiment 1. This embodiment only describes the differences; for details not specifically described, please refer to Embodiment 1. Reference Figures 10 to 12 As shown, in this embodiment, the arrangement of the soft-pack battery structure can also adopt the two methods given in Embodiment 1. However, for the column of screws 29 corresponding to the end where the annular seal 9 is located, the screws 29 corresponding to the annular seal 9 pass through the hollow hole of the annular seal 9, and the screws 29 corresponding to the relief notch 21 can pass out from the relief notch 21.

[0038] Example 4: Figures 7 to 9As shown, the main difference between this embodiment and embodiments 1 to 3 above is that the outer edge of the air bag 3 in this embodiment has a certain curvature. The curved edge divides the air bag 3 into multiple interconnected air bags 3, and a clearance gap 21 is formed between adjacent air bags 3. The edge of this embodiment is divided into a fifteenth edge 22, a sixteenth edge 23, a seventeenth edge 24, an eighteenth edge 25, a nineteenth edge 26, and a twentieth edge 27. The fifteenth edge 22 is opposite to the seventeenth edge 24, and the sixteenth edge 23 is opposite to the eighteenth edge 25. The tab 1 extends from the fifteenth edge 22 to the outside of the packaging bag. The eighteenth edge 25 is divided into multiple segments, and adjacent segments of the eighteenth edge 25 are connected by two nineteenth edges 26 and one twentieth edge 27, wherein the twentieth edge 27 is curved. The bottom of the partition seal 8 is connected to the seventeenth seal edge 24, and a gap is left between the top of the partition seal 8 and the fifteenth seal edge 22 to form an air hole 10. Although the air bags 3 are divided into multiple vertically, a gap is also left between the twentieth seal edge 27 and the partition seal 8 between adjacent air bags 3 to form an air hole 10, so that the interiors of all air bags 3 are interconnected.

[0039] Based on the soft-pack battery structure described in this embodiment, the battery pack fixing structure disclosed in this embodiment can still refer to Embodiment 1 and... Figures 10 to 12 Unlike Embodiment 1, in this embodiment, the screw 29 near the partition seal 8 passes through the clearance notch 21. Unless otherwise specified, the same applies to Embodiment 1.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soft-pack battery structure, comprising a battery cell and a packaging bag, wherein the battery cell includes an electrode assembly and tabs, the packaging bag has a battery cell cavity, the electrode assembly is built into the battery cell cavity, the tabs extend from the electrode assembly to the outside of the packaging bag, and a sealing edge is provided around the edge of the packaging bag to form a sealed space inside the packaging bag, characterized in that: The packaging bag has a partition seal on the side adjacent to the cell cavity. The partition seal and the adjacent sealing edge form an air bag. There is a gap between the partition seal and the sealing edge near the cell cavity to form an air hole. The air hole connects the cell cavity and the air bag. There is an annular seal inside the air bag. The middle area of ​​the annular seal is hollowed out.

2. The soft-pack battery structure according to claim 1, characterized in that: The sealing edge is divided into a first sealing edge, a second sealing edge, a third sealing edge, and a fourth sealing edge. The first sealing edge is opposite to the third sealing edge, and the second sealing edge is opposite to the fourth sealing edge. A part of the first sealing edge, a part of the second sealing edge, a part of the third sealing edge, and a partition seal together enclose the cell cavity. The partition seal, another part of the first sealing edge, the fourth sealing edge, and another part of the third sealing edge together enclose and form an air bag. The electrode tab extends from one side of the first sealing edge to the outside of the packaging bag. One end of the partition seal is connected to the third sealing edge, and a gap is left between the other end of the partition seal and the first sealing edge to form an air hole. A ring seal is set between the partition seal and the fourth sealing edge.

3. The soft-pack battery structure according to claim 1, characterized in that: The sealing edge is divided into a fifth sealing edge, a sixth sealing edge, a seventh sealing edge, and an eighth sealing edge. The fifth sealing edge is opposite to the seventh sealing edge, and the sixth sealing edge is opposite to the eighth sealing edge. The electrode tab extends from one side of the fifth sealing edge to the outside of the packaging bag. The two sides of the battery cell cavity are respectively provided with partition seals. The middle part of the fifth sealing edge, the partition seals on both sides, and the middle part of the seventh sealing edge together enclose the battery cell cavity. A part of the fifth sealing edge, a part of the sixth sealing edge, a part of the seventh sealing edge, and a partition seal on one side together enclose to form a first air bag. The other part of the fifth sealing edge, the other part of the eighth sealing edge, the other part of the seventh sealing edge, and a partition seal on the other side together enclose to form a second air bag. One end of each partition seal on both sides is connected to the seventh sealing edge, and the other end of each partition seal on both sides leaves a gap with the fifth sealing edge to form an air hole. Both the first air bag and the second air bag are provided with annular seals.

4. The soft-pack battery structure according to claim 1, characterized in that: The sealing edge is divided into the ninth, tenth, eleventh, twelfth, thirteenth, and fourteenth sealing edges. The ninth and eleventh sealing edges are opposite each other, and the tenth and thirteenth sealing edges are opposite each other. The thirteenth sealing edge is shorter than the tenth sealing edge. The eleventh and thirteenth sealing edges are connected by an L-shaped twelfth sealing edge, and the ninth and thirteenth sealing edges are connected by an L-shaped fourteenth sealing edge. The twelfth and fourteenth sealing edges are axially symmetrical to each other. The partition seal is set on one side of the cell cavity. The electrode tab extends from the ninth sealing edge to the outside of the packaging bag. The partition seal, a part of the twelfth sealing edge, the thirteenth sealing edge, and a part of the fourteenth sealing edge together form an air bag. One end of the partition seal is connected to the twelfth sealing edge, and a gap is left between the other end of the partition seal and the fourteenth sealing edge to form an air hole. The two sides of the outside of the air bag are respectively formed with clearance notches.

5. A battery pack fixing structure, characterized in that: The battery pack includes multiple soft-pack battery structures as described in any one of claims 1-4, a first support plate, a second support plate, a screw, and a nut. Both opposite ends of the first support plate and both opposite ends of the second support plate are provided with through holes. Multiple soft-pack battery structures are stacked sequentially to form a battery pack. The tabs of each soft-pack battery structure in the battery pack face the same direction. A first support plate is provided on one side of the battery pack, and a second support plate is provided on the other side. The first and second support plates clamp and fix the battery pack. The first and second support plates are connected by a screw, and nuts are fitted at both ends of the screw. The screw on at least one side of the first and second support plates passes through the annular seal perforation of each soft-pack battery structure.

6. A soft-pack battery structure, comprising a battery cell and a packaging bag, wherein the battery cell includes an electrode assembly and tabs, the packaging bag has a battery cell cavity, the electrode assembly is built into the battery cell cavity, and a sealing edge is provided around the edge of the packaging bag to form a sealed space inside the packaging bag, characterized in that: The packaging bag has a partition seal on the side adjacent to the cell cavity. The partition seal and the adjacent sealing edge form multiple connected air bags. The sealing edge between adjacent air bags is curved, so that the sealing edge between adjacent air bags forms a clearance gap with only one side open. There is a gap between the partition seal and the sealing edge near the cell cavity to form an air hole, which connects the cell cavity and the air bag.

7. A soft-pack battery structure according to claim 6, characterized in that: The sealing edge is divided into the fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, and twentieth sealing edges. The fifteenth sealing edge is opposite to the seventeenth sealing edge, and the sixteenth sealing edge is opposite to the eighteenth sealing edge. The electrode tab extends from one side of the fifteenth sealing edge to the outside of the packaging bag. A portion of the fifteenth sealing edge, a portion of the sixteenth sealing edge, a portion of the seventeenth sealing edge, and the partition seal together enclose the cell cavity. The eighteenth sealing edge is divided into multiple segments with intervals. Adjacent segments of the eighteenth sealing edge are connected by two nineteenth sealing edges and one twentieth sealing edge. The twentieth sealing edge is curved and close to the partition seal with a gap between them.

8. A battery pack fixing structure, characterized in that: The battery pack includes multiple soft-pack battery structures as described in claim 6 or 7, a first support plate, a second support plate, a screw, and a nut. Both opposite ends of the first support plate and both opposite ends of the second support plate have through holes. Multiple soft-pack battery structures are stacked sequentially to form a battery pack. The tabs of each soft-pack battery structure in the battery pack face the same direction. A first support plate is provided on one side of the battery pack, and a second support plate is provided on the other side. The first and second support plates clamp and fix the battery pack. The first and second support plates are connected by a screw, and nuts are fitted at both ends of the screw. The screw on at least one side of the first and second support plates passes through a clearance notch in each soft-pack battery structure.

Images