A soft-pack battery

Abstract

The utility model provides a kind of soft package battery, soft package battery includes: electric core main body, soft shell, flow guide part and hot melt adhesive;Soft shell is sealed and covered in the outside of electric core main body, and includes at least one adhesive portion;One end of flow guide part is electrically connected with the electric core body in soft shell, and the other end passes through adhesive portion and extends to the outside of soft shell;Hot melt adhesive is at least covered in the area of flow guide part extending to adhesive portion, and makes flow guide part and soft shell seal bonding;Wherein, flow guide part includes fuse portion, hot melt adhesive is covered in the outer periphery of fuse portion, and area overlapping region is formed between fuse portion, hot melt adhesive and adhesive portion.The utility model can solve the technical problem that soft package battery cannot realize directional pressure relief when thermal runaway occurs.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a soft-pack battery. Background Technology

[0002] In existing technologies, pouch batteries typically use aluminum-plastic film as the encapsulation shell. Due to the material properties of the aluminum-plastic film and the thin and lightweight design of pouch batteries, it is difficult to incorporate standard explosion-proof valves like hard-shell batteries. When a pouch battery experiences thermal runaway due to abuse conditions such as overcharging or internal short circuits, a large amount of gas is instantly generated inside, causing a sharp increase in pressure and temperature. At this point, pressure relief can only rely on the tearing of the heat-sealed edges (i.e., adhesive parts) around the aluminum-plastic film encapsulation shell. However, the pressure relief channel formed in this way has a random position and direction, constituting non-directional pressure relief. This can lead to high-temperature, flammable projectiles directly impacting adjacent pouch batteries or critical components within the battery module, thereby accelerating and amplifying the propagation of thermal runaway and creating significant safety hazards. Summary of the Invention

[0003] This invention provides a pouch battery to solve the technical problem that pouch batteries cannot achieve directional pressure relief when thermal runaway occurs.

[0004] This utility model provides a soft-pack battery, which includes: a cell body, a soft shell, a current-conducting portion, and hot melt adhesive; the soft shell is sealed and covered outside the cell body and includes at least one adhesive portion; one end of the current-conducting portion is electrically connected to the cell body inside the soft shell, and the other end extends through the adhesive portion to the outside of the soft shell; the hot melt adhesive covers at least the area of ​​the current-conducting portion extending to the adhesive portion, and seals and bonds the current-conducting portion to the soft shell; wherein, the current-conducting portion includes a fusible portion, the hot melt adhesive covers the outer periphery of the fusible portion, and an area of ​​overlap is formed between the fusible portion, the hot melt adhesive, and the adhesive portion.

[0005] In one embodiment of the present invention, the flow guiding portion further includes a first flow guiding section and a second flow guiding section disposed on both sides of the fuse portion. The first flow guiding section is electrically connected to the battery cell body, and the first flow guiding section and the second flow guiding section are respectively welded to the fuse portion. The second flow guiding section extends at least partially to the outside of the soft shell.

[0006] In one embodiment of this utility model, along the bonding direction between the guide portion and the soft shell, the projection of the overlapping area covers the projection of the fused portion.

[0007] In one embodiment of the present invention, the end of the fused portion near the first flow guide section extends through the adhesive portion into the soft shell, and the end of the fused portion near the second flow guide section is located in the area of ​​area overlap.

[0008] In one embodiment of the present invention, at least one end of the second flow guide section near the fusion section is covered with hot melt adhesive and extends into the area of ​​the adhesive section to be sealed and bonded to the soft shell.

[0009] In one embodiment of the present invention, the end of the fused portion near the second guide section extends through the adhesive portion into the soft shell, and the end of the fused portion near the first guide section is located in the area overlap region.

[0010] In one embodiment of the present invention, at least one end of the first guide section near the fusion section is covered with hot melt adhesive and extends into the area of ​​the adhesive section to bond with the soft shell.

[0011] In one embodiment of this utility model, along the arrangement direction of the battery cell body and the current guiding part, the width of the adhesive part is 5-7 mm, the width of the hot melt adhesive is 8-10 mm, and the width of the hot melt adhesive covers the width of the adhesive part.

[0012] In one embodiment of the present invention, along the width direction of the adhesive portion, one end of the hot melt adhesive passes through the adhesive portion and extends to the outside of the soft shell, and the width dimension of the hot melt adhesive located outside the soft shell is 0.5 to 1.5 mm.

[0013] In one embodiment of this utility model, the width of the fuse portion is 2-4 mm along the arrangement direction of the battery cell body and the current-conducting portion.

[0014] In one embodiment of the present invention, the two ends of the fusible part are welded to the first guide section and the second guide section respectively, and the material of the fusible part is any one of aluminum alloy, tin alloy and zinc alloy.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a soft-pack battery. The current-conducting part of the soft-pack battery includes a fusible part, and hot melt adhesive covers the outer periphery of the fusible part. An overlapping area is formed between the fusible part, the hot melt adhesive, and the adhesive part. When the pressure and temperature inside the soft-pack battery rise due to thermal runaway, the heat on the current-conducting part will preferentially concentrate on the fusible part, causing it to melt rapidly. The melting of the fusible part directly weakens the structural support it provides in the adhesive part, making this overlapping area the weakest area in terms of mechanical strength in the entire soft-pack packaging structure. Under internal pressure, the rupture will preferentially start from this weak area and extend to the entire installation position of the current-conducting part and the adhesive part, ultimately forming a controllable and directional pressure relief channel in the circumference of the soft shell. This design guides the pressure relief path through a preset weak point, achieving directional pressure relief. It can effectively prevent high-temperature jets from randomly impacting adjacent cells or key components, thereby suppressing the spread of thermal runaway and improving the overall safety of the battery module. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the overall structure of a soft-pack battery according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0020] Figure 3 This is a schematic diagram showing the arrangement position between the guide portion and the hot melt adhesive in one embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the bonding position between the adhesive part, the guide part and the hot melt adhesive in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the overall structure of the guide section provided in one embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram showing the arrangement position between the hot melt adhesive and the melting part in one embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the overlapping area in one embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the overlapping area in another embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the overlapping area in another embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram showing the width dimensions of the adhesive portion, the fusion portion, and the hot melt adhesive in one embodiment of this utility model.

[0028] The attached figures are labeled as follows:

[0029] 100. Soft-pack battery; 10. Battery cell body; 20. Soft shell; 21. Adhesive part; 22. Receiving cavity; 30. Current guiding part; 31. Fusible part; 32. First current guiding section; 33. Second current guiding section; 40. Hot melt adhesive; 50. Area overlap area. Detailed Implementation

[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0033] Please see Figures 1 to 10 This invention provides a pouch battery 100. The current-guiding portion 30 of the pouch battery 100 includes a fusible portion 31. Hot melt adhesive 40 covers the outer periphery of the fusible portion 31, and an overlapping area 50 is formed between the fusible portion 31, the hot melt adhesive 40, and the adhesive portion 21. When the pressure and temperature inside the pouch battery 100 rise due to thermal runaway, the heat on the current-guiding portion 30 will preferentially concentrate on the fusible portion 31, causing it to melt rapidly. The melting of the fusible portion 31 directly weakens the structural support it provides in the adhesive portion 21, making the overlapping area 50 the weakest area in terms of mechanical strength in the entire pouch 20 encapsulation structure. Under internal pressure, rupture will preferentially begin in this weak area and extend to the entire mounting position of the current-guiding portion 30 and the adhesive portion 21, ultimately forming a controllable and directional pressure relief channel in the circumference of the pouch 20. This design guides the pressure relief path through pre-set weak points, achieving directional pressure relief. It can effectively prevent high-temperature ejected materials from randomly impacting adjacent cells or critical components, thereby suppressing the spread of thermal runaway and improving the overall safety of the battery module.

[0034] Please see Figures 1 to 4The soft-pack battery 100 provided by this utility model includes a cell body 10, a soft shell 20, a current-conducting portion 30, and hot melt adhesive 40. The soft shell 20 covers the outside of the cell body 10 and includes at least one adhesive portion 21. The soft shell 20 includes, but is not limited to, a conventional aluminum-plastic film structure. Specifically, the soft shell 20 includes a receiving cavity 22 and an adhesive portion 21 disposed on the outer periphery of the receiving cavity 22, and the cell body 10 is installed in the receiving cavity 22. Both the receiving cavity 22 and the cell body 10 are approximately flat cuboid structures, and the length direction of the receiving cavity 22 is consistent with the length direction of the cell body 10, such as... Figure 1 As shown on the X-axis. The width direction of the receiving cavity 22 is consistent with the width direction of the cell body 10, as shown in the figure. Figure 1 As shown on the Y-axis.

[0035] The number of adhesive portions 21 provided on the outer periphery of the receiving cavity 22 is not limited. For example, in one embodiment, the receiving cavity 22 may have adhesive portions 21 on both sides in the length and width directions, that is, a total of four adhesive portions 21 are provided around the soft shell 20, forming a four-sided sealing structure. In another embodiment, the receiving cavity 22 is a hollow cavity structure with openings at both ends in the length direction before encapsulation, and the adhesive portions 21 are only provided on both sides in the length direction of the receiving cavity 22, that is, only two adhesive portions 21 are provided on the outer periphery of the soft shell 20.

[0036] It should be noted that, in this embodiment, there are multiple ways to achieve a seal at the adhesive portion 21 for the receiving cavity 22. For example, an adhesive can be applied to the adhesive portion 21 to form a seal through bonding; alternatively, a heat sealing device can be used to heat the adhesive portion 21, causing its material to melt and bond, thereby achieving a seal at that location.

[0037] Please see Figures 7 to 9 One end of the current-guiding portion 30 is electrically connected to the cell body 10 inside the soft shell 20, and the other end extends out of the soft shell 20 through the adhesive portion 21 at the corresponding position. The current-guiding portion 30 can be a conductive metal sheet, and the portion of the current-guiding portion 30 extending into the soft shell 20 can be electrically connected to the cell body 10 by welding. Specifically, the current-guiding portion 30 is electrically connected to the positive or negative electrode tab of the cell body 10. By realizing the electrical connection between the cell body 10 and the outside through the current-guiding portion 30, the current of the cell body 10 can be led out to the outside of the soft-pack battery 100, thereby realizing the charging and discharging of the soft-pack battery 100.

[0038] The cell body 10 can be an electrode stack or an electrode winding. Specifically, the cell body 10 includes a positive electrode, a negative electrode, and a separator. The positive and negative electrodes have opposite polarities. The separator is disposed between the positive and negative electrodes to separate them. The cell body 10 can adopt a winding structure, that is, the positive electrode, separator, and negative electrode are stacked and wound to form an electrode winding body; or, the cell body 10 can adopt a stacked structure, that is, the positive electrode, separator, and negative electrode are stacked sequentially to form an electrode stack. A positive electrode tab is formed at one end of the cell body 10 along its length, and a negative electrode tab is formed at the other end of the cell body 10 along its length. Two current-conducting portions 30 are correspondingly provided, one of which is connected to the positive electrode tab, and the other is connected to the negative electrode tab.

[0039] Please see Figures 7 to 9 The hot melt adhesive 40 covers at least the area from the flow guide 30 to the adhesive portion 21, sealing and bonding the flow guide 30 to the soft shell 20. Specifically, during the edge sealing process of the soft shell 20, the hot melt adhesive 40 melts and bonds with the adhesive portion 21 under high temperature and pressure, thereby fixing the flow guide 30 covered within the hot melt adhesive 40 to the adhesive portion 21, achieving a sealed and fixed installation between the flow guide 30 and the soft shell 20. The specific type and composition of the hot melt adhesive 40 can adopt the type and composition used for sealing and fixing the flow guide 30 in the existing soft-pack battery 100, which will not be elaborated here.

[0040] Please see Figures 5 to 7 The current-conducting part 30 includes a fuse part 31. When the pouch battery 100 experiences abnormal overheating or a severe short circuit, the fuse part 31 can prevent the occurrence or spread of thermal runaway by actively melting the current path, thereby improving the safety of the pouch battery 100.

[0041] The specific structure of the fuse element 31 can take various forms depending on design requirements. For example, in one embodiment, the fuse element 31 can be formed with a narrowed structure, such as a "neck" or "V-groove," at a specific location in the flow guide 30 through processing techniques such as stamping. This structure reduces the cross-sectional area, making it the weakest link in the conductive path with the highest resistance and fastest heat accumulation, thus allowing it to melt first under overcurrent conditions and achieve circuit protection. In another embodiment, the fuse element 31 can also be implemented by providing a "perforation" structure in the flow guide 30. The perforated area locally reduces the mechanical strength and heat capacity of the material, causing it to melt preferentially over other parts under overcurrent or overheating conditions. In addition, in other embodiments, a low-melting-point metal material can be used as a connecting piece, integrated into a specific section of the flow guide 30. The melting point of this connecting piece is lower than that of the main material of the flow guide 30 (such as aluminum or nickel), enabling it to melt first under abnormal temperature rise conditions, thereby forming a reliable fuse element 31.

[0042] It should be noted that the fuse 31 can be provided on the current-conducting portion 30 connected to the negative electrode tab of the battery cell body 10, or it can be provided on the current-conducting portion 30 connected to the positive electrode tab of the battery cell body 10, or it can be provided on both the positive and negative electrode tabs of the current-conducting portion 30 connected to the battery cell body 10. This embodiment does not limit this.

[0043] Please see Figures 7 to 9 Hot melt adhesive 40 covers the outer periphery of the fused portion 31, and an overlapping area 50 is formed between the fused portion 31, the hot melt adhesive 40, and the adhesive portion 21 (e.g., Figures 7 to 9 The area defined by the dashed box). Specifically, along the bonding direction of the adhesive portion 21 (e.g., Figure 7 As shown on the Z-axis, there is an overlapping area between the projections of the fused portion 31, the hot melt adhesive 40, and the adhesive portion 21. This overlapping area is the aforementioned area overlap region 50. The specific form of the area overlap region 50 is not limited. For example, along the adhesive direction of the adhesive portion 21, the projections of both the fused portion 31 and the hot melt adhesive 40 may fall completely within the projection of the adhesive portion 21. Alternatively, the projection of the hot melt adhesive 40 may fall completely within the projection of the adhesive portion 21, while the projection of the fused portion 31 may partially fall within the area of ​​the adhesive portion 21.

[0044] In this embodiment, the current-guiding portion 30 of the pouch battery 100 includes a fusible portion 31, and hot melt adhesive 40 covers the outer periphery of the fusible portion 31. An overlapping area 50 is formed between the fusible portion 31, the hot melt adhesive 40, and the adhesive portion 21. With this configuration, when the internal pressure and temperature of the pouch battery 100 increase due to thermal runaway, the heat on the current-guiding portion 30 will preferentially concentrate on the fusible portion 31, causing it to melt rapidly. The melting of the fusible portion 31 directly weakens the structural support it provides in the adhesive portion 21, making the overlapping area 50 the weakest area in terms of mechanical strength in the entire pouch 20 encapsulation structure. Under internal pressure, rupture will preferentially begin in this weak area and extend to the entire mounting position of the current-guiding portion 30 and the adhesive portion 21, ultimately forming a controllable and directional pressure relief channel in the circumference of the pouch 20. This design guides the pressure relief path through pre-set weak points, achieving directional pressure relief. This effectively prevents high-temperature ejected materials from randomly impacting adjacent cells or critical components, thereby suppressing the spread of thermal runaway and improving the overall safety of the battery module.

[0045] Please see Figure 5 and Figure 7In one embodiment of this utility model, the current guiding portion 30 further includes a first current guiding section 32 and a second current guiding section 33 disposed on both sides of the fuse portion 31. The first current guiding section 32 is electrically connected to the battery cell body 10, and the first current guiding section 32 and the second current guiding section 33 are respectively welded to the fuse portion 31. The second current guiding section 33 extends at least partially outside the soft shell 20. Specifically, along the arrangement direction of the battery cell body 10 and the current guiding portion 30 (e.g., ... Figure 7 (As shown on the W-axis), the first current-guiding section 32 is disposed close to the battery cell body 10 and is electrically connected to the corresponding side tab of the battery cell body 10. The electrical connection method includes, but is not limited to, welding connection. The fusible part 31 is disposed on the side of the first current-guiding section 32 away from the battery cell body 10, and the second current-guiding section 33 is disposed on the side of the fusible part 31 away from the first current-guiding section 32. The two sides of the fusible part 31 are welded to the first current-guiding section 32 and the second current-guiding section 33, respectively. The side of the second current-guiding section 33 away from the fusible part 31 can extend completely outside the soft shell 20, that is, to the outside of the adhesive part 21, or it can extend partially outside the soft shell 20. The size of the exposed area of ​​the second current-guiding section 33 is only required to meet the connection requirements between the current-guiding part 30 and the external electrical connector.

[0046] Of course, in other embodiments, the two sides of the fuse portion 31 can also be electrically connected to the first guide section 32 and the second guide section 33 by means of conductive adhesive bonding or mechanical pressing.

[0047] The specific materials of the fuse section 31, the first current-conducting section 32, and the second current-conducting section 33 are not limited and can be adapted according to the performance and safety requirements of the pouch battery 100. For example, in one embodiment, the first current-conducting section 32 and the second current-conducting section 33 can be made of conventional metal materials used for battery tabs, such as aluminum, nickel, or nickel-plated copper strips. To achieve precise overcurrent or overheat protection, the fuse section 31 is preferably made of a metal material with a melting point lower than that of the materials of the first current-conducting section 32 and the second current-conducting section 33, such as aluminum alloy, tin alloy, or zinc alloy.

[0048] Furthermore, in other embodiments, the fuse section 31, the first guide section 32, and the second guide section 33 can also be made of the same material. In this case, to ensure the fusing performance of the fuse section 31, the thickness of the fuse section 31 can be reduced or perforated, etc.

[0049] The current guiding section 30 structure used in this embodiment employs a segmented design, allowing the fuse section 31 to be designed and material-selected as an independent component. This structure enables flexible selection of the material (such as a low-melting-point alloy) for the fuse section 31 based on the specific safety requirements of the pouch battery model 100, and precise control of its geometric dimensions (such as thickness and width), thereby accurately matching the required fusing current value and trigger temperature threshold. Compared to traditional one-piece molding solutions where fusing parameters are limited by a single material, this segmented structure offers superior adaptability and accuracy in overcurrent and overheat protection.

[0050] Please see Figure 7 In one embodiment of this invention, along the bonding direction between the flow guide 30 and the soft shell 20, the projection of the overlapping area 50 covers the projection of the fuse part 31. This arrangement ensures that the entire fuse part 31 is located within the overlapping area 50. When the soft-pack battery 100 experiences thermal runaway and the fuse part 31 overheats and melts, a large structurally weak area can be formed at the adhesive part 21 corresponding to the overlapping area 50. This allows for the rapid formation of a pressure relief channel at the corresponding adhesive part 21, enabling timely pressure relief. Therefore, this design improves pressure relief efficiency, further suppresses the spread of thermal runaway, and enhances the overall safety of the soft-pack battery 100.

[0051] Please see Figure 8 In one embodiment of this utility model, along the arrangement direction of the battery cell body 10 and the current guiding section 30, the end of the fuse portion 31 near the first current guiding section 32 extends through the adhesive section 21 into the soft shell 20, that is, the fuse portion 31 is at least partially exposed in the receiving cavity 22 of the soft shell 20. The end of the fuse portion 31 near the second current guiding section 33 is located in the area overlap region 50.

[0052] In the above structure, since one end of the fusible link 31 extends directly into the interior of the soft shell 20, a solid channel penetrating the sealed interface can be formed. When the soft-pack battery 100 experiences thermal runaway, causing an increase in internal pressure, the high-temperature gas and its products will directly impact and surround the fusible link 31. At the instant the fusible link 31 melts due to heat, a gap is formed at its penetration point, allowing the high-pressure gas inside to rapidly rush in and precisely act on the structurally weak area corresponding to the overlapping area 50. The concentrated gas pressure applied to the inner surface of this weak area causes the pressure relief port to quickly tear and form along a preset path, creating a directional pressure relief channel consistent with the shape of the overlapping area 50. This structural design can effectively avoid the risk of disorderly accumulation and random breakage of pressure in the receiving cavity 22 of the soft shell 20, thereby shortening the pressure relief response time and improving the reliability and timeliness of the thermal runaway protection of the soft-pack battery 100.

[0053] Based on the above embodiments, further, in one embodiment of this utility model, please refer to... Figure 8The second flow guide section 33, at least partially covered with hot melt adhesive 40 at one end near the fuse portion 31, extends into the area of ​​the adhesive portion 21 and is sealed and bonded to the adhesive portion 21 of the soft shell 20. By covering the end of the second flow guide section 33 near the fuse portion 31 with hot melt adhesive 40 and extending into the area of ​​the adhesive portion 21, the connection between the second flow guide section 33 and the fuse portion 31 is effectively fixed within the adhesive portion 21. This structure can significantly enhance the mechanical stability of the connection, reduce the risk of tensile stress and structural deformation caused by vibration, deformation, or internal pressure changes of the soft-pack battery 100, thereby reducing the possibility of connection failure and ensuring that the flow guide section 30 maintains stable electrical connection and structural integrity during long-term use.

[0054] Please see Figure 9 In one embodiment of the present invention, the end of the fused portion 31 near the second guide section 33 extends through the adhesive portion 21 into the soft shell 20, and the end of the fused portion 31 near the first guide section 32 is located within the area overlap region 50.

[0055] With the above structure, one end of the fusible link 31 can extend directly outside the soft shell 20. When the fusible link 31 melts due to heat, a fusible channel can be formed between the adhesive part 21 and the outside of the soft shell 20, achieving communication between the overlapping area 50 and the outside of the soft shell 20. This structure allows high-pressure gas accumulated in the overlapping area 50 to be quickly discharged to the outside of the soft shell 20 through this fusible channel, achieving timely pressure relief. This shortens the pressure relief response time and improves the reliability and timeliness of the thermal runaway protection of the soft-pack battery 100.

[0056] Based on the previous embodiment, please continue to refer to... Figure 9 In one embodiment of this utility model, the end of the first flow guiding section 32 near the fusible part 31 is at least partially covered with hot melt adhesive 40, and extends into the area of ​​the adhesive part 21 to bond with the adhesive part 21 of the soft shell 20. By covering the end of the first flow guiding section 32 near the fusible part 31 with hot melt adhesive 40 and extending into the area of ​​the adhesive part 21, the connection between the first flow guiding section 32 and the fusible part 31 is effectively fixed within the area of ​​the adhesive part 21. This structure can significantly enhance the mechanical stability of the connection, reduce the risk of tensile stress and structural deformation caused by vibration, deformation or internal pressure changes of the soft-pack battery 100, thereby reducing the possibility of connection failure and ensuring that the flow guiding part 30 maintains stable electrical connection and structural integrity during long-term use.

[0057] Please see Figure 10In one embodiment of this utility model, along the arrangement direction of the battery cell body 10 and the current guiding portion 30, the width of the adhesive portion 21 is 5-7 mm, for example, 5 mm, 6 mm, or 7 mm. The width of the hot melt adhesive 40 is 8-10 mm, for example, 8 mm, 9 mm, or 10 mm. For ease of description, the width of the adhesive portion 21 is marked as L1, and the width of the hot melt adhesive 40 is marked as L2. The width of the hot melt adhesive 40 covers the width of the adhesive portion 21. Specifically, under the condition that the width of the hot melt adhesive 40 covers the width of the adhesive portion 21, the width of the hot melt adhesive 40 can be equal to the width of the adhesive portion 21, that is, the boundaries of the two are aligned in the width direction. The width of the hot melt adhesive 40 can also be greater than the width of the adhesive portion 21. In this case, the hot melt adhesive 40 can extend beyond the width boundary of the adhesive portion 21 on one or both sides, extending to the outside of the width direction of the adhesive portion 21.

[0058] In this embodiment, by setting the width of the hot melt adhesive 40 to cover the width of the adhesive portion 21, it is ensured that the flow guide portion 30 is completely covered by the hot melt adhesive 40 throughout the entire area penetrating the adhesive portion 21. This design ensures that all contact interfaces between the flow guide portion 30 and the soft shell 20 within the adhesive portion 21 are sealed and protected by the hot melt adhesive 40, thereby effectively enhancing the structural sealing of the flow guide portion 30 penetration location, preventing electrolyte leakage or intrusion of external contaminants, and thus improving the long-term reliability of the soft-pack battery 100 package.

[0059] Please see Figure 10 In one embodiment of this utility model, along the width direction of the adhesive portion 21, one end of the hot melt adhesive 40 passes through the adhesive portion 21 and extends to the outside of the soft shell 20, and the width dimension of the hot melt adhesive 40 outside the soft shell 20 is 0.5 to 1.5 mm, for example, it can be 0.5 mm, 1.0 mm, or 1.5 mm. For ease of description, this width dimension is marked as L3. By extending the hot melt adhesive 40 to the outside of the soft shell 20, it can be ensured that the guide portion 30 is completely covered in the edge area of ​​the adhesive portion 21 in the width direction. This design helps to eliminate potential leakage paths at the sealing interface edge of the adhesive portion 21, so that the guide portion 30 and the adhesive portion 21 form a continuous and complete sealing interface throughout the contact area, improving the sealing reliability of both. At the same time, if the width dimension of the hot melt adhesive 40 outside the soft shell 20 is less than 0.5 mm, it is difficult to ensure the sealing effect at the outer edge of the adhesive portion 21. If the width of the hot melt adhesive 40 outside the soft shell 20 exceeds 1.5 mm, it will result in excessive use of the hot melt adhesive 40, which will not only increase the overall weight of the soft-pack battery 100 but also waste the hot melt adhesive 40 and increase sealing costs. In this embodiment, by limiting the width of the hot melt adhesive 40 outside the soft shell 20 to the range of 0.5 to 1.5 mm, the sealing effect of the guide portion 30 and the adhesive portion 21 at the outer edge position can be balanced with the reasonable amount of hot melt adhesive 40 used.

[0060] Please see Figure 10 In one embodiment of this utility model, along the arrangement direction of the battery cell body 10 and the current-conducting part 30, the width of the fuse part 31 is 2-4 mm, for example, it can be 2 mm, 3 mm, or 4 mm. For ease of description, the width of the fuse part 31 is marked as L4. Under the premise that the thickness of the fuse part 31 is constant, its width directly affects the fusing performance: when the width is less than 2 mm, it may cause the current-conducting part 30 to have excessively high resistance, uneven current distribution, and local overheating under normal operating conditions; when the width is greater than 4 mm, the excessive cross-sectional area will disperse the heat generated by the current and slow down the fusing response speed. This embodiment limits the width of the fuse part 31 to the range of 2-4 mm, which ensures both the conductivity efficiency during normal operation and the rapid accumulation of heat during overcurrent or overheating, accurately triggering the fusing action.

[0061] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A soft-pack battery, characterized in that, include: Battery cell body; A soft shell, which is sealed to the outside of the battery cell body, and includes at least one adhesive portion; A flow guide, one end of which is electrically connected to the battery cell body inside the soft shell, and the other end extends through the adhesive portion to the outside of the soft shell; Hot melt adhesive is used to cover at least the area where the flow guide extends to the adhesive portion, and to seal and bond the flow guide to the soft shell. The flow guide includes a fusion cut-off portion, the hot melt adhesive covers the outer periphery of the fusion cut-off portion, and an area of ​​overlap is formed between the fusion cut-off portion, the hot melt adhesive, and the adhesive portion.

2. The soft-pack battery according to claim 1, characterized in that, The flow guiding portion further includes a first flow guiding section and a second flow guiding section disposed on both sides of the fuse portion. The first flow guiding section is electrically connected to the battery cell body. The first flow guiding section and the second flow guiding section are respectively welded to the fuse portion. The second flow guiding section extends at least partially to the outside of the soft shell.

3. The soft-pack battery according to claim 2, characterized in that, Along the bonding direction between the flow guide and the soft shell, the projection of the overlapping area covers the projection of the fused portion.

4. The soft-pack battery according to claim 2, characterized in that, The end of the fused portion near the first flow guide section penetrates the adhesive portion and extends into the soft shell, while the end of the fused portion near the second flow guide section is located within the area overlap region.

5. The soft-pack battery according to claim 4, characterized in that, The second guide section is at least partially covered with the hot melt adhesive at one end near the fused portion, and extends into the area of ​​the adhesive portion to seal and bond with the soft shell.

6. The soft-pack battery according to claim 4, characterized in that, The end of the fused portion near the second flow guide section extends through the adhesive portion and into the soft shell, while the end of the fused portion near the first flow guide section is located within the area overlap region.

7. The soft-pack battery according to claim 6, characterized in that, The first guide section is at least partially covered with the hot melt adhesive at one end near the fused portion, and extends into the area of ​​the adhesive portion to bond with the soft shell.

8. The soft-pack battery according to claim 1, characterized in that, Along the arrangement direction of the battery cell body and the current guiding part, the width of the adhesive part is 5-7 mm, the width of the hot melt adhesive is 8-10 mm, and the width of the hot melt adhesive covers the width of the adhesive part.

9. The soft-pack battery according to claim 8, characterized in that, Along the width direction of the adhesive portion, one end of the hot melt adhesive passes through the adhesive portion and extends to the outside of the soft shell, and the width of the hot melt adhesive outside the soft shell is 0.5 to 1.5 mm.

10. The soft-pack battery according to claim 1, characterized in that, Along the arrangement direction of the battery cell body and the current-conducting part, the width of the fuse part is 2 to 4 mm.

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