Battery pack and electronic equipment

Abstract

The utility model provides a battery pack. The battery pack comprises a box body, a battery cell stacking body, a heat-conducting structural adhesive and an output electrode structure, and the battery cell stacking body is formed by stacking a plurality of soft package battery cells and is arranged in the box body. The soft package battery cell comprises a main body part and an electrode lead-out part which extends outwards from at least one end of the main body part; and the heat-conducting structural adhesive is directly adhered between the battery cell stacking body and the box body. And the output pole structure is arranged in the box body and comprises an output pole piece fixing seat and a pair of output pole pieces. The output pole piece fixing seat is provided with an insulating separation part, and the pair of output pole pieces are arranged on the output pole piece fixing seat and located on the two opposite sides of the insulating separation part, so that the lap joint faces of the pair of output pole pieces on the two sides are arranged in a back-to-back mode. Part of the electrode lead-out parts form a pair of output electrode lead-out parts, and the pair of output electrode lead-out parts extend outwards in the extension direction of the main body part and are directly attached and welded to the lap joint surfaces of the corresponding pair of output electrode sheets, so that the process steps are simplified, and the production efficiency is improved.

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 different 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. In the prior art, the output pole lead-out part needs to be bent and pressed onto the output pole bar with a tooling roller, and then the two are welded and fixed, resulting in low production efficiency. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery pack, which simplifies the process steps of welding the output electrode lead-out portion to the overlapping surface of the output electrode tab, thereby facilitating improving production efficiency.

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the utility model provides a battery pack, which includes a box, a battery cell stack, a thermally conductive structural adhesive and an output pole structure. The battery cell stack is formed by stacking a plurality of soft-pack battery cells and is arranged in the box. The soft-pack battery cell includes a main body and an electrode lead-out portion extending outward from at least one end of the main body. The electrode lead-out portions of at least two adjacent soft-pack battery cells are directly overlapped and welded and fixed. The thermally conductive structural adhesive is directly bonded between the battery cell stack and the box. The output pole structure is arranged in the box, including an output pole bar fixing seat and a pair of output pole bars. The output pole bar fixing seat has an insulating partition, and a pair of output pole bars are arranged on the output pole bar fixing seat and located on two opposite sides of the insulating partition, so that the overlapping surfaces of a pair of output pole bars on both sides are arranged opposite to each other. Among them, part of the electrode lead-out portion is formed as a pair of output pole lead-out portions, and a pair of output pole lead-out portions extend outward along the extension direction of the main body and are directly welded with the overlapping surfaces of the corresponding pair of output pole bars.

[0006] According to the battery pack provided by the first aspect of the utility model, since a pair of output pole lead parts extend outwardly along the extension direction of the main body and are directly welded to the overlapping surfaces of the corresponding pair of output pole tabs, the process steps of welding the output pole lead parts to the overlapping surfaces of the output pole tabs are simplified, which is conducive to improving production efficiency. In addition, since a pair of output pole tabs are arranged on the output pole tab fixing seat and are located on the opposite sides of the insulating partition, the overlapping surfaces of the pair of output pole tabs on both sides are arranged opposite to each other. In this way, when a pair of output pole lead parts are respectively welded to the overlapping surfaces of a pair of output pole tabs, the pair of output pole lead parts are separated and not easy to overlap together, and the output pole lead parts can be welded and fixed to the output pole tabs without bending, which not only improves the reliability of the electrical connection, but also improves the production efficiency.

[0007] As the battery pack of the preferred technical solution of the utility model, the thickness direction of the output pole piece where the overlap surface is located is parallel to the stacking direction of the soft-pack battery cells in the battery cell stack.

[0008] According to the preferred technical solution, since the thickness direction of the output pole piece where the lap joint is located is parallel to the stacking direction of the soft-pack battery cells in the battery cell stack, the lap joint is basically parallel to the extension direction of the main body. After the output pole lead-out portion extends outward from the main body, it can be directly welded to the lap joint surface without being rolled and bent, which is beneficial to simplify the process steps and improve production efficiency.

[0009] As a battery pack of the preferred technical solution of the present utility model, the box body includes a beam structure, and the output pole structure is directly fixed on the beam structure or fixed on the beam structure through a connecting structure.

[0010] According to the preferred technical solution, since the output pole structure is directly fixed on the beam structure or fixed on the beam structure through a connecting structure, it is beneficial to reduce the space occupied by the output pole structure and the fixing structure used to fix the output pole structure in the box body, thereby increasing the space left for the soft-pack battery cell itself in the box body.

[0011] As a battery pack of the preferred technical solution of the utility model, each output pole piece includes: a plate-shaped body, and an output connection portion formed by bending and extending the end of the plate-shaped body, and the overlap surface is formed on the plate-shaped body. The insulating partition includes: a first partition and a second partition located below the first partition, a pair of plate-shaped bodies are separated and arranged on two opposite walls of the second partition, and a pair of output connection portions are separated and arranged on both sides of the first partition.

[0012] According to the preferred technical solution, since the first partition of the insulating partition separates a pair of output connection parts, and the second partition of the insulating partition separates a pair of plate-like bodies, the insulation reliability of the insulating partition is improved. In addition, since the pair of plate-like bodies are separated and arranged on two opposite wall surfaces of the second partition, the second partition not only plays a role in separating the pair of plate-like bodies, but also plays a role in supporting and fixing the pair of plate-like bodies, which is conducive to simplifying the output pole structure and reducing the volume and weight of the output pole structure.

[0013] As the preferred technical solution of the battery pack of the utility model, the output pole piece fixing seat includes a first support portion with a nut member embedded therein, and the first support portion is located between the first partition portion and the second partition portion. The output connection portion is supported on the first support portion and is connected and fixed to the first support portion in a manner of overlapping the nut member.

[0014] According to the preferred technical solution, since the output pole piece fixing seat includes a first supporting portion with a nut member embedded therein, the output connecting portions of a pair of output pole pieces can be more easily connected and fixed to the output pole piece fixing seat by using the nut member.

[0015] As the battery pack of the preferred technical solution of the utility model, the output pole piece fixing seat also includes a second support portion connected and fixed to the insulating partition portion, and the second support portion is isolated and arranged between the output pole piece and the main body portion. The second support portion is integrally formed with the insulating partition portion.

[0016] According to the preferred technical solution, since the output pole piece fixing seat includes two supporting parts, the output pole piece can be fixed more stably. Since the second supporting part and the insulating partition are integrally formed, the manufacturing process of the output pole piece fixing seat can be simplified, and it is beneficial to improve the assembly accuracy between the output pole piece and the output pole piece fixing seat.

[0017] As a battery pack of the preferred technical solution of the utility model, the second supporting portion includes a baffle perpendicular to the lead-out direction of the output pole lead-out portion, and the insulating partition portion is located in the middle of a side surface of the baffle facing away from the main body portion.

[0018] According to the preferred technical solution, since the second support portion located between the output pole piece and the main body includes a baffle, wear of the main body caused by possible contact between the output pole piece and the main body can be prevented. In addition, since the baffle is provided, the output pole piece is not easy to contact the electrode lead-out portion of other nearby soft-pack batteries, which is conducive to improving the reliability of the electrical connection.

[0019] As a battery pack of the preferred technical solution of the utility model, a pair of through holes for the output lead-out portion to pass through is opened on the baffle, and the pair of through holes are respectively arranged on both sides of the insulating partition.

[0020] According to the preferred technical solution, a pair of separated through holes makes it difficult for a pair of output pole lead-out parts to contact each other, which is beneficial to improving the reliability of the electrical connection.

[0021] The battery pack as the preferred technical solution of the utility model further includes: foam glue. The box body includes a beam structure, and the foam glue is filled between the beam structure, the main body and the electrode lead-out part.

[0022] According to the preferred technical solution, the foamed glue is filled between the beam structure, the main body and the electrode lead-out part, which can fix the battery cell stack and increase the rigidity and strength of the battery pack. On the other hand, it can isolate the adjacent electrode lead-out parts to achieve electrical insulation between the electrode lead-out parts and between the electrode lead-out parts and the box body. At the same time, it can also reduce the risk of heat transfer between different soft-pack battery cells during thermal runaway.

[0023] 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

[0024] Figure 1 It is a schematic diagram of the structure of the battery pack in some embodiments of the present utility model;

[0025] Figure 2 It is a schematic diagram of the structure of a battery cell stack in some embodiments of the present utility model;

[0026] Figure 3 is a partial top view of a battery cell stack in some embodiments of the present invention;

[0027] Figure 4 yes Figure 2 A partial enlarged view of the middle A area;

[0028] Figure 5 It is a schematic diagram of the structure of the output pole piece in some embodiments of the utility model;

[0029] Figure 6 It is a structural schematic diagram (stereoscopic diagram) of the output pole structure in some embodiments of the utility model;

[0030] Figure 7 It is a structural schematic diagram (front view) of the output pole structure in some embodiments of the utility model.

[0031] Reference numerals:

[0032] 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 battery cell; 201-main body; 202-electrode lead-out part; 202a-output pole lead-out part; foam glue 29; 3-output pole structure; 31-output pole piece fixing seat; 311-insulating partition; 3111-first partition; 3112-second partition; 312-first support part; 3121-nut member; 313-second support part; 3132-baffle; 3133-perforation; 32-output pole piece; 321-lap surface; 322-plate-shaped main body; 323-output connection part. DETAILED DESCRIPTION

[0033] 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.

[0034] <Terms and Explanations>

[0035] 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 electricity-consuming or electricity-storing equipment such as electric vehicles and energy storage power stations.

[0036] The term "x-axis direction" in the present disclosure refers to the length direction of the soft-pack battery cell, the "y-axis direction" refers to the stacking direction of the soft-pack battery cell, and the "z-axis direction" refers to the direction perpendicular to the plane defined by the x-axis and the y-axis. The term "upper" in the present disclosure refers to the direction away from the bottom plate of the lower shell in the z-axis direction, and "lower" refers to the direction close to the bottom plate of the lower shell in the z-axis direction.

[0037] <Battery Pack>

[0038] 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.

[0039] Continue to refer Figure 1The 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 matches the size and shape of 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 is enclosed together with the top plate 11 and the bottom plate to form an installation space 10. The middle beam 123 is arranged in the middle of the lower shell bottom plate 120, and the installation space 10 inside the box body 1 is divided 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, a pair of output electrode lead portions 202a of each of the two groups of battery cell stacks 2 can be fixed at the middle beam 123 and the two groups of battery cell stacks 2 can be electrically connected to each other, and then power can be supplied to the outside of the battery pack 100 via the output electrode structure 3 set at the side beam 122.

[0040] Figure 2 Schematic diagram of the structure of a group of battery cell stacks 2. Figure 1 and Figure 2 , multiple soft-packed cells 20 are arranged side by side in a manner that the main body 201 (i.e., the part composed of two opposite side surfaces with larger area of ​​the soft-packed cells 20) correspond to each other, thereby forming a cell stack 2. After the cell stack 2 is compressed, the cell stack 2 is put into a box (placed inside the box 1), and the bottom of the box 1 can be coated with a thermal conductive structural adhesive (not shown) in a partial area. The thermal conductive structural adhesive can be used to directly bond the entire cell stack 2 to the box 1.

[0041] Figure 3 It is a partial top view of the battery cell stack 2. Figure 2 and Figure 3 The soft-pack battery cell 20 further includes an electrode lead-out portion 202 extending outward from at least one end of the main body portion 201 , and at least some of the electrode lead-out portions 202 of two adjacent soft-pack battery cells 20 are directly overlapped and welded to fix.

[0042] Continue to refer Figure 3 The foam glue 29 is filled between the side beam 122, the main body 201 and the electrode lead-out portion 202. Figure 3Only a schematic diagram of the structure of one end of the soft-pack battery cell 20 is shown, but specifically, the foam glue 29 can be filled at both ends of the length direction of the soft-pack battery cell 20, that is, between the side beam 122 and the battery cell stack 2 formed by stacking the soft-pack battery cells 20, and between the middle beam 123 of the box body and the battery cell stack 2. The foam glue 29 is poured between the soft-pack battery cell 20 and the side beam 122, and the middle beam 123 of the box body. After foaming and curing, the gap between the battery cell stack 2 and the side beam 122, and the gap between the battery cell stack 2 and the middle beam 123 of the box body will be filled with the foam glue 29.

[0043] In the above manner, the foam glue 29 can fix the battery cell stack 2 and increase the rigidity and strength of the soft-pack CTP battery pack 100, and can isolate the electrode lead-out parts 202 to achieve electrical insulation between the electrode lead-out parts 202 and between the electrode lead-out parts 202 and the box 1. At the same time, it can also reduce the risk of heat transfer between different soft-pack battery cells 20 during thermal runaway.

[0044] <Output pole structure>

[0045] Figure 4 yes Figure 2 A partial enlarged view of area A in the middle. Figure 2 and Figure 4 The output pole structure 3 is arranged at the end of the battery cell stack 2 in the x-axis direction and is located inside the box body 1. The output pole structure 3 includes an output pole tab fixing seat 31 and a pair of output pole tabs 32. The output pole tab fixing seat 31 has an insulating partition 311, and a pair of output pole tabs 32 are arranged on the output pole tab fixing seat 31 and are located on two opposite sides of the insulating partition 311, so that the overlapping surfaces 321 of the pair of output pole tabs 32 on both sides are arranged opposite to each other. Among them, part of the electrode lead-out portion 202 is formed as a pair of output pole lead-out portions 202a, and the pair of output pole lead-out portions 202a extend outward along the extension direction of the main body 201 and are directly welded to the overlapping surfaces 321 of the corresponding pair of output pole tabs 32.

[0046] Specifically, a pair of output pole tabs 32 are arranged on both sides of the insulating partition 311 along the y-axis direction, so that the overlapping surfaces 321 of the pair of output pole tabs 32 are respectively arranged in opposite directions on the y-axis. A pair of output pole lead portions 202a extend outwardly along the x-axis direction and are directly welded to the overlapping surfaces 321 of the corresponding pair of output pole tabs 32.

[0047] Although Figure 4 Only the state on one side of the insulating partition 311 is shown, but it can be understood that Figure 4 A similar state also occurs on the other side of the insulating partition 311 not shown.

[0048] By making a pair of output pole lead parts 202a extend outward along the extension direction of the main body 201 and directly welded to the corresponding overlapped surfaces 321 of a pair of output pole tabs 32, the process steps of welding the output pole lead parts 202a to the overlapped surfaces 321 of the output pole tabs 32 are simplified, which is conducive to improving production efficiency. In addition, by making a pair of output pole tabs 32 be arranged on the output pole tab fixing seat 31 and located on the opposite sides of the insulating partition 311, the overlapped surfaces 321 of the pair of output pole tabs 32 on both sides are arranged opposite to each other, so that when a pair of output pole lead parts 202a are respectively welded to the overlapped surfaces 321 of a pair of output pole tabs 32, the pair of output pole lead parts 202a are separated and not easily overlapped together, and the reliability of the electrical connection is improved.

[0049] It should be noted here that the "partial electrode lead portion 202 is formed into a pair of output pole lead portions 202a" mentioned above includes the case where the partial electrode lead portion 202 directly serves as the output pole lead portion 202a, and the case where the output pole lead portion 202a is formed by extending the partial electrode lead portion 202.

[0050] In some preferred embodiments, reference Figure 4 , the thickness direction of the output pole tab 32 where the overlap surface 321 is located is parallel to the stacking direction (y-axis direction) of the soft-pack battery cells 20 in the battery cell stack 2. In other words, the overlap surface 321 on the output pole tab 32 for bonding with the output pole lead-out portion 202a is parallel to the lead-out direction (x-axis direction) of the output pole lead-out portion 202a. In this way, the output pole lead-out portion 202a can be directly welded to the overlap surface 321 without rolling and bending after extending outward from the main body 201, which is conducive to simplifying the process steps and improving production efficiency.

[0051] It should be understood that the "parallel to" mentioned above is not limited to the situation of being completely parallel. As long as the thickness direction of the output pole tab 32 where the lap joint surface 321 is located is substantially parallel to the stacking direction of the soft-pack battery cells 20 in the battery cell stack 2, the technical effect of the output pole lead portion 202a being directly welded to the lap joint surface 321 without rolling and bending can be achieved. For example, in other embodiments, there may be a small angle between the lap joint surface 321 and the x-axis direction.

[0052] In some preferred embodiments, the box includes a beam structure 121, and the output pole structure 3 is directly fixed on the beam structure 121 or fixed on the beam structure 121 through a connecting structure. In this way, it is helpful to reduce the occupation of the space in the box 1 by the output pole structure 3 and the fixing structure for fixing the output pole structure 3, so that the space reserved for the soft-pack battery cell 20 in the box 1 can be increased. Specifically, depending on whether the output pole structure 3 is used to fix the middle output pole lead-out portion 202a located between two battery cell stacks 2, or to fix the total output pole lead-out portion 202a located at the side beam 122 of the box 1, the output pole structure 3 can be directly fixed on the side beam 122 or fixed on the side beam 122 through a connecting structure, or can be directly fixed on the middle beam 123 or fixed on the middle beam 123 through a connecting structure.

[0053] Of course, in other embodiments, the output pole structure 3 may also be fixed on other connection structures inside the box 1 .

[0054] In some preferred embodiments, reference Figure 5 Each output pole piece 32 includes: a plate-shaped body 322, and an output connection portion 323 formed by bending and extending the end of the plate-shaped body 322, and a lap joint surface 321 is formed on the plate-shaped body 322. Figure 6 to Figure 7 The output pole piece fixing seat 31 includes an insulating partition portion 311 , a first supporting portion 312 and a second supporting portion 313 .

[0055] Specifically, the insulating partition 311 includes a first partition 3111 and a second partition 3112 located below the first partition 3111. A pair of plate-like bodies 322 are separated and arranged on two opposite walls of the second partition 3112, and a pair of output connection parts 323 are separated and arranged on both sides of the first partition 3111. By setting the first partition 3111 and the second partition 3112, the insulation reliability of the insulating partition 311 can be improved. In addition, since the pair of plate-like bodies 322 are separated and arranged on two opposite walls of the second partition 3112, the second partition 3112 not only plays a role in separating the pair of plate-like bodies 322, but also plays a role in supporting and fixing the pair of plate-like bodies 322, which is conducive to simplifying the output pole structure 3 and reducing the volume and weight of the output pole structure 3. Figure 6 to Figure 7 In the illustrated embodiment, the first partition 3111 and the second partition 3112 are integrally formed. In other embodiments, the first partition 3111 and the second partition 3112 may also be structural members that are manufactured separately and then assembled.

[0056] Specifically, the first support portion 312 is located between the first partition portion 3111 and the second partition portion 3112, and a pair of nut members 3121 are pre-buried therein. A pair of output connection portions 323 are supported on the first support portion 312, and are connected and fixed to the first support portion 312 by overlapping the nut members 3121. In some embodiments, a bolt can be passed through an opening on the output connection portion 323 and cooperate with the nut member 3121, so that the output connection portion 323 is connected and fixed to the first support portion 312. Through the above-mentioned connection method, the output connection portion 323 of the output pole piece 32 can be easily connected and fixed to the output pole piece fixing seat 31. Figure 6 to Figure 7 In the illustrated embodiment, the middle portion of the upper plate portion of the first support portion 312 bulges upward to form the first partition portion 3111. In other embodiments, the first partition portion 3111 may also be in other forms, such as a convex strip or a convex block connected to the upper plate portion of the first support portion 312.

[0057] Specifically, the second support portion 313 is isolated and disposed between the output pole piece 32 and the main body 201, and is used to be connected and fixed with the insulating partition portion 311. Figure 6 to Figure 7 In the illustrated embodiment, the second support portion 313 is formed as a baffle 3132 disposed perpendicular to the x-axis direction. By disposing the baffle 3132 between the output pole piece 32 and the main body 201, wear of the main body 201 caused by possible contact between the output pole piece 32 and the main body 201 can be prevented. In addition, due to the provision of the baffle 3132, the output pole piece 32 will not contact the electrode lead-out portion 202 of other nearby soft-pack battery cells 20, which is conducive to improving the reliability of the electrical connection.

[0058] An insulating partition 311 is provided in the middle of a side surface of the baffle 3132 facing away from the main body 201, and through holes 3133 are respectively provided on both sides of the insulating partition 311. The through hole 3133 has a length extending in the z-axis direction, and its length extending in the z-axis direction is greater than the width of the output pole lead-out portion 202a in the z-axis direction, so that the sheet-shaped output pole lead-out portion 202a can be passed through the through hole 3133. Since a pair of output pole lead-out portions 202a are respectively passed through a pair of through holes 3133, it is not easy for the pair of output pole lead-out portions 202a to contact each other, which is conducive to improving the reliability of electrical connection.

[0059] Although the second support portion 313 is described above by taking the baffle 3132 as an example, the present application is not limited thereto, and any support component having an isolation function is within the technical scope of the present application.

[0060] It should be noted that, although in the embodiment introduced above, the battery pack 100 is a power battery pack 100 of an electric vehicle, in other embodiments of the present invention, the battery pack 100 is not limited to application in this limited scenario, and can also be used in other suitable electronic devices, and the present application does not impose any restrictions on this.

[0061] 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: Box; A battery cell stack is formed by stacking a plurality of soft-pack battery cells and is disposed in the box, wherein the soft-pack battery cell comprises: a main body and an electrode lead-out portion extending outward from at least one end of the main body, wherein the electrode lead-out portions of at least two adjacent soft-pack battery cells are directly overlapped and welded to be fixed; Thermally conductive structural adhesive, the thermally conductive structural adhesive is directly bonded between the battery cell stack and the box; An output pole structure is arranged in the box, and the output pole structure comprises: an output pole piece fixing seat and a pair of output pole pieces, the output pole piece fixing seat has an insulating partition, and the pair of output pole pieces are arranged on the output pole piece fixing seat and located on two opposite sides of the insulating partition, so that the overlapping surfaces of the pair of output pole pieces on the two sides are arranged opposite to each other; Among them, part of the electrode lead-out parts is formed into a pair of output pole lead-out parts, and the pair of output pole lead-out parts extend outward along the extension direction of the main body and are directly welded to the overlapping surfaces of the corresponding pair of output pole tabs.

2. The battery pack according to claim 1, characterized in that: The thickness direction of the output electrode sheet at the portion where the overlap surface is located is parallel to the stacking direction of the soft-pack battery cells in the battery cell stack.

3. The battery pack according to claim 1, characterized in that: The box body comprises a beam structure, and the output pole structure is directly fixed on the beam structure or fixed on the beam structure through a connecting structure.

4. The battery pack according to claim 2, characterized in that: Each of the output pole pieces comprises: a plate-shaped body, and an output connection portion formed by bending and extending the end of the plate-shaped body, and the overlap surface is formed on the plate-shaped body. The insulating partition includes: a first partition and a second partition located below the first partition, a pair of the plate-like bodies are separately arranged on two opposite wall surfaces of the second partition, and a pair of the output connection parts are separately arranged on both sides of the first partition.

5. The battery pack according to claim 4, characterized in that: The output pole piece fixing seat includes a first support portion with a nut member embedded therein, the first support portion is located between the first partition portion and the second partition portion, the output connecting portion is supported on the first support portion and is connected and fixed to the first support portion in a manner of overlapping the nut member.

6. The battery pack according to claim 4, characterized in that: The output pole piece fixing seat includes a second supporting portion connected and fixed to the insulating partition portion, and the second supporting portion is isolated and arranged between the output pole piece and the main body portion. The second supporting portion and the insulating partition portion are integrally formed.

7. The battery pack according to claim 6, characterized in that: The second supporting portion includes a baffle that is perpendicular to the lead-out direction of the output pole lead-out portion, and the insulating partition portion is located at a middle portion of a side surface of the baffle that faces away from the main body portion.

8. The battery pack according to claim 7, characterized in that: The baffle is provided with a pair of through holes for the output pole lead-out portion to pass through, and the pair of through holes are disposed on both sides of the insulating partition portion.

9. The battery pack according to any one of claims 1 to 8, characterized in that: Also includes: The box body comprises a beam structure, and the foamed glue is filled between the beam structure, the main body and the electrode lead-out part.

10. An electronic device, characterized in that: A battery pack as claimed in any one of claims 1 to 9.

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