Battery packs and electronic devices

Abstract

The utility model relates to the field of batteries, and specifically to a battery pack and an electronic device. The battery pack includes a box, a battery cell stack, a tape and a thermally conductive structural adhesive, wherein the box has an installation space, the battery cell stack is arranged in the installation space, the battery cell stack includes a plurality of soft-pack batteries, the soft-pack batteries include a side seal, the tape is attached to and wraps the side seal, the tape separates the side seal from the thermally conductive structural adhesive, and at least a portion of the thermally conductive structural adhesive is directly bonded between the tape and the box. By attaching and wrapping the side seal with the tape, the thermally conductive structural adhesive can be prevented from penetrating into the soft-pack battery through the side seal, thereby ensuring the electrical insulation and withstand voltage performance of the battery pack.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, and in particular to a battery pack and an electronic device. Background Art

[0002] In electric vehicles or energy storage systems that require large capacity and high voltage output, it is usually necessary to connect multiple battery cells in series and / or in parallel to form a battery module, and then connect the battery modules in series and / or in parallel to form a battery pack, and further use the battery pack as an energy system for powering electric vehicles or as an energy storage system. As a solution to improve energy density, the CTP (cell to pack) type battery pack omits the step of forming battery modules from battery cells, and directly integrates the battery cells into a battery pack, thereby eliminating the structural parts and electrical connectors required to form the battery module, so that the space left for the battery cells themselves can be increased.

[0003] At present, common battery cells are divided into cylindrical cells, square-shell cells and soft-pack cells according to their structures. CTP battery packs using square-shell cells have been widely promoted and used, but soft-pack cells still face a series of problems in the process of integration into CTP battery packs because they are not easy to withstand external impacts and have poor assembly properties.

[0004] In some solutions of using soft-pack battery cells to form a CTP type battery pack, the battery stack formed by stacking soft-pack battery cells can be directly bonded and fixed to the box body by a thermally conductive structural adhesive. However, in the prior art, the electrical insulation withstand voltage performance of the battery pack obtained by this direct bonding solution is not as good as expected. Summary of the invention

[0005] Side sealing part In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a battery pack for solving the problem of poor electrical insulation and withstand voltage performance of the battery pack in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the first aspect of the utility model provides a battery pack, including a box body, a battery cell stack, tape and a thermally conductive structural adhesive, wherein the box body has an installation space, the battery cell stack is arranged in the installation space, the battery cell stack includes a plurality of soft-pack battery cells, the soft-pack battery cells include a side sealing portion, the tape is attached to and wraps the side sealing portion, the tape separates the side sealing portion from the thermally conductive structural adhesive, and at least a portion of the thermally conductive structural adhesive is directly bonded between the tape and the box body.

[0007] According to the battery pack provided by the first aspect of the utility model, by sticking and wrapping the side sealing part with tape, the thermal conductive structural adhesive can be prevented from penetrating into the interior of the soft-pack battery cell through the side sealing part, thereby ensuring the electrical insulation and voltage resistance performance of the battery pack.

[0008] Optionally, the box body includes a lower shell, the lower shell includes a lower shell bottom plate and a beam structure, the beam structure is arranged at the outer edge and / or the middle of the lower shell bottom plate to enclose an installation space, at least a portion of the thermal conductive structural adhesive is directly bonded between the lower shell bottom plate and the tape, the soft-pack battery cell includes a main body and a pole ear extending from the end of the main body in the length direction of the main body, the battery pack also includes foam glue, the foam glue is arranged between the pole ear, the main body and the beam structure, and the tape is adhered to the side seal portion on the non-pole ear side of the soft-pack battery cell.

[0009] Wrapping the ends of the soft-pack battery cells with foam glue can reduce the risk of heat transfer between different soft-pack battery cells during thermal runaway and improve safety performance.

[0010] Optionally, the tape is U-shaped, covering the end face of the soft-pack battery cell corresponding to the side seal portion and at least a portion of the two side faces of the soft-pack battery cell. By pasting the tape in the above manner, the position that may be immersed in the thermal conductive structural adhesive can be more comprehensively sealed, and the side seal portion can be more completely separated from the thermal conductive structural adhesive. Moreover, the end face of one side of the grouped battery cell stack can be made smoother, which is convenient for bonding with the thermal conductive structural adhesive. Pasting the tape in a manner that covers both side faces also makes the structure more stable, which can improve the reliability of tape pasting.

[0011] Optionally, the tape is L-shaped, covering the end surface of the soft-pack battery cell corresponding to the side seal portion and at least a portion of one side surface of the soft-pack battery cell. By sticking the tape in the above manner, on the one hand, the side seal portion can be fixed more stably, and on the other hand, compared with the solution of U-shaped tape covering both sides at the same time, the amount of tape used can also be reduced, saving costs.

[0012] Optionally, the adhesive tape is matched and attached to the end surface of the soft-pack battery cell corresponding to the side sealing portion. By attaching the adhesive tape in a matching and attached manner to the end surface, less adhesive tape can be used, and additional gaps between the soft-pack battery cells due to attaching the adhesive tape can be avoided.

[0013] Optionally, the width of the side covered by the tape is D1, D1≤6mm. The width of the side covered by the tape should not be too wide. Experiments have found that a tape with a width of less than 6mm can effectively control costs and effectively improve the strength and stability of the adhesive.

[0014] Optionally, along the length direction of the soft-pack battery cell, the end of the tape extends to a position 1-5 mm beyond the edge of the main body. Using a tape of a specified length slightly longer than the main body can, on the one hand, leave a certain margin of error for the location of the tape, and on the other hand, avoid the need for an additional cutting process due to the tape being too long, thereby improving the production efficiency of the tape.

[0015] Optionally, the main body includes a plastic film, the plastic film is an aluminum-plastic film, the side sealing portion has a folding structure, and the tape is attached to and wrapped around the folding structure. By attaching the tape to the folding structure and taking targeted measures for the position that is easily immersed in the thermal conductive structural adhesive, the amount of tape used can be effectively reduced while ensuring the effect of preventing the thermal conductive structural adhesive from being immersed.

[0016] Optionally, the thickness of the tape is T, 30≤T≤85μm. The thickness of the tape should not be too thin or too thick. Too thick tape will affect the thermal conductivity, while too thin tape is easily damaged, affecting the strength of bonding and fixing the battery cell stack. Tape with a thickness within the range of 30≤T≤85μm can solve the above problems.

[0017] The second aspect of the present invention further provides an electronic device having the battery pack provided by the first aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded diagram of the schematic structure of a battery pack in some embodiments of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of a battery cell stack in some embodiments of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of a soft-pack battery cell in some embodiments of the present invention.

[0021] Figure 4 It is a front view of a schematic structural diagram of a portion of a battery cell stack in the first embodiment.

[0022] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0023] Figure 6 It is a front view of a schematic structural diagram of a portion of a battery cell stack in the second embodiment.

[0024] Figure 7 for Figure 6 A partial enlarged view of point B in the middle.

[0025] Figure 8 It is a front view of a schematic structural diagram of a portion of a battery cell stack in the third embodiment.

[0026] Fig. 9 for Figure 8 A partial enlarged view of point C in the middle.

[0027] Reference numerals:

[0028] 100-battery pack; 1-box; 10-installation space; 101-first installation space; 102-second installation space; 11-top plate; 12-lower shell; 120-bottom plate of lower shell; 121-beam structure; 122-side beam; 123-middle beam; 2-cell stack; 20-soft-pack cell; 201-main plane; 202-ear; 203-main body; 204-plastic film; 205-side; 206-side sealing part; 207-tape; 208-end face; 21-side plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] <Terms and Explanations>

[0031] The term "electronic device" in the present disclosure should be understood in a broad sense, and may refer not only to computers, mobile phones, PDAs, etc., but also to electric vehicles, energy storage power stations, and other electricity-consuming or electricity-storing devices.

[0032] Spatially relative terms such as "upper", "lower", "bottom", "top", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the drawings. It should be understood that the spatially relative terms may also include different orientations of the device in use and operation in addition to the orientation shown in the drawings.

[0033] The term "and / or" includes any and all combinations of the associated listed items.

[0034] <Battery Pack>

[0035] refer to Figure 1 In some embodiments of the present invention, a battery pack 100 used as a power battery pack for an electric vehicle is provided. The battery pack 100 is a CTP type battery pack, including a box 1 and a battery cell stack 2. Two groups of battery cell stacks 2 can be placed in one box 1, and each group of battery cell stacks 2 is formed by stacking a plurality of soft-pack battery cells 20 along the thickness direction of the soft-pack battery cells 20. Figure 2 It is a schematic structural diagram of one group of battery cell stacks 2.

[0036] Figure 2 Schematic diagram of the structure of the battery cell stack 2. Figure 1 and Figure 2A plurality of soft-pack battery cells 20 are arranged side by side with the main planes 201 (ie, two opposite sides with larger areas of the soft-pack battery cells 20 ) corresponding to each other, thereby forming a battery cell stack 2 .

[0037] Side plates 21 are provided on both sides of the cell stack 2. The side plates 21 apply a pre-tightening force inward along the stacking direction of the soft-pack cells 20 to the cell stack 2, which can squeeze to reduce the gap between the soft-pack cells 20 and make the soft-pack cells 20 stacked together more compactly.

[0038] After compacting the battery cell stack 2, the battery cell stack 2 is placed into a box (placed inside the box 1). The bottom of the box 1 can be coated with a thermally conductive structural adhesive (not shown) in some areas. Using the thermally conductive structural adhesive, the battery cell stack 2 can be directly bonded to the box 1 as a whole.

[0039] The box body 1 is formed by covering the top plate 11 on the lower shell 12. The lower shell 12 includes a lower shell bottom plate 120 and a beam structure 121. The lower shell bottom plate 120 is a rectangular panel, which is the same size and shape as the top plate 11 and is arranged at the bottom of the lower shell 12. The beam structure 121 is vertically arranged between the top plate 11 and the lower shell bottom plate 120, and includes a side beam 122 and a middle beam 123. Among them, the side beam 122 is arranged at the outer edge of the lower shell bottom plate 120, in a rectangular frame shape, and together with the top plate 11 and the bottom plate, encloses the installation space 10. The middle beam 123 is arranged in the middle of the lower shell bottom plate 120, and divides the installation space 10 inside the box body 1 into a first installation space 101 and a second installation space 102, wherein the first installation space 101 is used to install a group of battery cell stacks 2, and the second installation space 102 is used to install another group of battery cell stacks 2. In some embodiments, an electrical connection component may be provided at the middle beam 123 to electrically connect the two groups of battery cell stacks 2 to each other, and to supply power to the electric vehicle via output electrodes provided at the side beams 122 .

[0040] In order to fix the battery stack 2 more stably, foam glue (not shown) can be filled between the two ends of the battery stack 2 along the length direction of the soft-pack battery 20 and the beam structure 121. Figure 3 ), the main body 203 (see Figure 3 ) and the beam structure 121. By wrapping both ends of the soft-pack battery cell 20 in the length direction with foam glue, the risk of heat propagation between different soft-pack battery cells 20 during thermal runaway can be reduced, thereby improving safety performance.

[0041] <Soft pack battery>

[0042] In some embodiments, the structure of a single soft-pack battery cell 20 is as follows: Figure 3As shown, the soft-pack battery cell 20 includes a main body 203 and a tab 202, wherein the main body includes a plastic film 204 and a bare battery cell. The bare battery cell is a long strip structure formed by positive and negative electrode films, a separator, an electrolyte, etc. The plastic film 204 can be, for example, an aluminum-plastic film or a polymer film, which is wrapped around the outside of the main body 203. The plastic film 204 is sealed at at least one side 205 in the width direction of the bare battery cell by, for example, heat sealing to form a side sealing portion 206 (see FIG. 2 ). Figure 5 ), thereby sealing the bare cell inside the plastic film 204, protecting the bare cell and preventing electrolyte leakage. Optionally, the length-to-width ratio of the main body 203 is greater than 2, or the length-to-width ratio of the main body 203 is greater than 3, or the length-to-width ratio of the main body 203 is greater than 4.

[0043] The two ends of the soft-pack battery cell 20 in the length direction respectively have two lead-out parts, which include a pole ear 202 extending from the inside of the plastic film 204 and fixed to the plastic film 204 by hot melting by heating the pole ear glue to seal the opening through which the pole ear 202 extends to prevent electrolyte leakage through this opening.

[0044] In this embodiment, the plastic film 204 is sealed by heat sealing at both sides 205 of the width direction end of the main body 203 to form a side sealing portion 206. In order to further seal the side sealing portion 206 and prevent the thermal conductive structural adhesive from penetrating into the soft-pack battery cell 20 from the side sealing portion 206 when the thermal conductive structural adhesive is pasted, in this embodiment, an insulating tape 207 is pasted on both side sealing portions 206 of the plastic film 204 of each soft-pack battery cell 20.

[0045] The tape 207 attached to the side seal 206 is configured to extend along the length direction of the soft-pack battery 20. In some embodiments, the length of the tape 207 can be substantially equal to or slightly longer than the length of the soft-pack battery 20, so as to wrap the side seal 206 of the entire soft-pack battery 20 in the length direction. In this way, the tape 207 can wrap the side seal 206 more comprehensively, and even if the thermal conductive structural adhesive covers a larger area when flattened, the tape 207 can more reliably seal the plastic film 204 at the side seal 206 to prevent the thermal conductive structural adhesive from penetrating therefrom.

[0046] <First Embodiment>

[0047] The specific sticking form of the tape 207 can be adjusted as needed. Figure 4 and Figure 5 The form of the adhesive tape 207 provided in the first embodiment of the present invention is shown. Figure 5 yes Figure 4 A partial enlarged view of point A in the middle. Figure 4 And below Figure 6 and Figure 8 In the figures, several soft-pack battery cells 20 are briefly shown as an example, and the number of soft-pack battery cells 20 actually stacked in the battery cell stack 2 can be much larger than that shown in the figures.

[0048] In the first embodiment of the present invention, the adhesive tape 207 can be pasted corresponding to the side sealing portion 206 and wrap the side sealing portion 206 .

[0049] refer to Figure 4 and Figure 5 In this embodiment, at both ends of the bare cell in the width direction, two plastic films 204 (or two corresponding ends formed by folding a plastic film 204) are tightly attached to the end surface 208 at the side edge 205 of the bare cell and then closed to seal the edge. The two overlapping plastic films 204 are tightly attached and fixed by a heat sealing process to complete the edge sealing and form a side sealing portion 206.

[0050] In some embodiments of the present invention, the side seal portion 206 has a hem structure formed by folding once or multiple times. Figure 5 The side seal portion in this embodiment has a hem structure formed by folding twice.

[0051] Specifically, when the two plastic films 204 are closed together to be closely attached to the end surface 208 at the side edge 205 of the bare cell, they usually continue to extend along the width direction of the main body 203, which increases the width of the soft-pack cell 20. By bending the side sealing portion 206 to one side near the end surface 208 of the main body 203 during the heat sealing process, the width of the soft-pack cell 20 can be reduced, thereby reducing the space occupied by the stacked cell 2.

[0052] Furthermore, for the side sealing portion 206 that has been bent to one side, it can also be folded a second time, that is, the end of the folded edge structure bent to one side is folded back to overlap with a part of the folded edge structure, so as to further reduce the extension distance of the side sealing portion 206 in the thickness direction of the soft-pack battery cell 20 and prevent it from extending to a position beyond the main plane 201 of the soft-pack battery cell 20. In this way, when the soft-pack battery cells 20 are stacked, interference between adjacent soft-pack battery cells 20 due to the abutment of the side sealing portions 206 can be avoided.

[0053] In the first embodiment of the present invention, the tape 207 is pasted on the two side surfaces of the folding structure. Specifically, the surfaces on both sides of the fold formed by the secondary folding are covered, and the tape 207 still only covers the side sealing portion 206, and does not cover the plastic film 204 at the end surface 208. By pasting the tape 207 in the above manner, the use of the tape 207 can be effectively reduced, saving costs. At the same time, because the main positions that may be immersed in the thermal conductive structural adhesive have been specifically covered by the tape 207, it is still possible to effectively ensure the effect of preventing the thermal conductive structural adhesive from being immersed, thereby improving the electrical insulation and withstand voltage performance of the battery pack 100.

[0054] <Second Embodiment>

[0055] Figure 6 and Figure 7 The form of the adhesive tape 207 provided in the second embodiment of the present invention is shown. Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0056] In the second embodiment of the present invention, when the pasting is completed, the tape 207 is U-shaped, that is, the tape 207 covers the end surface 208 of the soft-pack battery 20 corresponding to the side sealing portion 206 (the end surface 208 can refer to Figure 5 , Figure 6 , Figure 7 The middle end surface 208 is invisible because it is covered by the tape 207 , and covers at least a portion of the two side surfaces (ie, the main body plane 201 ) of the soft-pack battery cell 20 .

[0057] In this embodiment, a relatively wide tape 207 is used. Specifically, the width of the tape 207 is greater than the thickness of the soft-pack battery cell 20, and it is pasted on the end of the side 205 of the soft-pack battery cell 20 in a manner corresponding to the center of the soft-pack battery cell 20. This way of pasting the tape 207, on the one hand, can more comprehensively seal the position that may be immersed in the thermal conductive structural adhesive, and separate the side seal 206 from the thermal conductive structural adhesive more completely. On the other hand, the side seal 206 can be reliably constrained to a position close to the end face 208 of the soft-pack battery cell 20 to prevent the side seal 206 from interfering with the stacking process of the soft-pack battery cell 20 or interfering with the process of pasting the battery cell stack 2 to the box 1. Moreover, this way of pasting the tape 207 can make one side end face of the grouped battery cell stack 2 smoother, which is convenient for bonding with the thermal conductive structural adhesive. Pasting the tape 207 in a manner that covers at least a portion of the two sides is also more stable, which can improve the reliability of the pasting of the tape 207.

[0058] <Third Embodiment>

[0059] Figure 8 and Fig. 9The form of the adhesive tape 207 provided in the third embodiment of the present utility model is shown. Fig. 9 yes Figure 8 A partial enlarged view of point C in the middle.

[0060] In the third embodiment of the present invention, when the adhesive tape 207 is pasted, it is L-shaped, that is, the adhesive tape 207 covers the end surface 208 of the soft-pack battery cell 20 corresponding to the side sealing portion 206, and only covers at least a portion of one side surface of the soft-pack battery cell 20. In particular, the adhesive tape 207 covers the side surface of the folding structure in the bending direction. Fig. 9 For example, the side sealing portion 206 of the soft-pack battery cell 20 on the left is bent to the right, and accordingly, the tape 207 only covers at least a portion of the right side surface of the soft-pack battery cell 20 on the left; the side sealing portion 206 of the soft-pack battery cell 20 on the right is bent to the left, and accordingly, the tape 207 only covers at least a portion of the left side surface of the soft-pack battery cell 20 on the right.

[0061] By pasting the tape 207 in the above manner, on the one hand, the side sealing portion 206 can be fixed more stably, and on the other hand, compared with the second embodiment, the amount of tape 207 can be effectively reduced, thereby reducing the gap between the soft-pack battery cells 20, so that the soft-pack battery cells 20 can be stacked more densely.

[0062] The second embodiment and the third embodiment respectively show the embodiments in which the tape 207 covers at least a portion of both side surfaces and at least a portion of a single side surface. In some other embodiments of the utility model, the tape 207 may also only cover the end surface 208 of the soft-pack battery cell 20 corresponding to the side sealing portion 206, but not cover the side surfaces of the soft-pack battery cell 20. This method can further reduce the amount of tape 207 used, and does not introduce additional gaps between the soft-pack battery cells 20, further improving the compactness of the stacking of the soft-pack battery cells 20.

[0063] In the second and third embodiments, the tape 207 covers at least a portion of at least one side of the soft-pack battery cell 20. Figure 3 , the width of the side covered by the tape 207 is D1, D1≤6mm. The width of the side covered by the tape 207 should not be too wide. If it exceeds a certain range, even if more tape 207 is used, the improvement of the bonding strength or stability is limited. Experiments have found that the tape 207 with a width of less than 6mm can effectively control the cost and effectively improve the bonding strength and stability.

[0064] Continue to refer Figure 3, along the length direction of the soft-pack battery cell 20, the end of the tape 207 extends beyond the edge of the main body 203. Specifically, the width of the tape 207 beyond the edge of the main body 203 is D2, 1≤D2≤5mm. Using a tape 207 of a specified length slightly longer than the main body 203 can, on the one hand, leave a certain margin of error for the location of pasting the tape 207, and on the other hand, avoid the need for an additional cutting process due to the excessive length of the tape 207, thereby improving the production efficiency of pasting the tape 207.

[0065] In the above embodiment of the utility model, preferably, the thickness of the tape 207 is T, 30≤T≤85μm. The thickness of the tape 207 should not be too thin or too thick. An overly thick tape 207 will affect the thermal conductivity, while an overly thin tape 207 will be easily damaged due to insufficient strength, affecting the strength of the adhesive fixing battery cell stack 2. The tape 207 with a thickness within the range of 30≤T≤85μm can solve the above problems.

[0066] With reference to the first to third embodiments of the present invention, in the embodiments of the present invention, the side seal 206 is separated from the thermally conductive structural adhesive by means of the adhesive tape 207. After assembly, the thermally conductive structural adhesive will be directly bonded between the adhesive tape 207 and the box body 1, thereby effectively solving the problem of the thermally conductive structural adhesive penetrating into the soft-pack battery cell 20 via the side seal 206, and improving the electrical insulation withstand voltage performance of the battery pack 100. The adhesive tape 207 may completely wrap the side seal 206, or may partially wrap the side seal 206, for example, only wrap the side seal 206 at a position where it may contact the thermally conductive structural adhesive, which is not limited in the embodiments of the present invention.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, wherein the box body has an installation space; A battery cell stack is arranged in the installation space, the battery cell stack includes a plurality of soft-pack battery cells, and the soft-pack battery cells have side sealing portions; Adhesive tape, adhered to and wrapped the side sealing part; The heat-conducting structural adhesive is separated from the side sealing portion by the adhesive tape, and at least a portion of the heat-conducting structural adhesive is directly bonded between the adhesive tape and the box body.

2. The battery pack according to claim 1, characterized in that: The box body includes a lower shell, and the lower shell includes a lower shell bottom plate and a beam structure. The beam structure is arranged at the outer edge and / or the middle of the lower shell bottom plate to enclose and form the installation space. At least a portion of the thermal conductive structural adhesive is directly bonded between the lower shell bottom plate and the tape.

3. The battery pack according to claim 2, characterized in that: The soft-pack battery cell includes a main body and a tab extending from an end of the main body in a length direction of the main body, and the adhesive tape is attached to the side sealing portion of the non-tab side of the soft-pack battery cell.

4. The battery pack according to claim 3, characterized in that: The battery pack further includes a foam glue, and the foam glue is arranged between the tab, the main body and the beam structure.

5. The battery pack according to claim 1, wherein: The adhesive tape is U-shaped and covers the end surface of the soft-pack battery cell corresponding to the side sealing portion and at least a portion of two side surfaces of the soft-pack battery cell.

6. The battery pack according to claim 1, wherein: The adhesive tape is L-shaped and covers an end surface of the soft-pack battery cell corresponding to the side sealing portion and at least a portion of one side surface of the soft-pack battery cell.

7. The battery pack according to claim 1, characterized in that: The adhesive tape is matched and bonded to the end surface of the soft-pack battery core corresponding to the side sealing portion.

8. The battery pack according to claim 5 or 6, characterized in that: The width of the tape covering the side surface is D1, and D1≤6mm.

9. The battery pack according to claim 3, characterized in that: Along the length direction of the soft-pack battery core, the end of the tape extends to a position 1-5 mm beyond the edge of the main body.

10. The battery pack according to claim 1, wherein: The side sealing portion has a folded edge structure, and the adhesive tape is attached to and wraps the folded edge structure.

11. The battery pack according to claim 1, wherein: The thickness of the adhesive tape is T, 30≤T≤85 μm.

12. An electronic device, characterized in that: A battery pack as claimed in any one of claims 1 to 11.

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