Battery pack

Abstract

The present application discloses a battery pack. The battery pack comprises: a lower housing, formed having a heat dissipation part; a battery cell module, disposed in the lower housing; a heat conduction assembly, comprising a heat conduction flexible component, the heat conduction flexible component having a thermally conductive connection with the battery cell module, and being in contact with the heat dissipation part. In the battery pack of the present application, the heat conduction assembly comprises the heat conduction flexible component, the heat conduction flexible component performs thermally conductive connection with the battery cell module, and heat generated by the battery cell module can be rapidly conducted to the heat conduction flexible component. Additionally, the heat conduction flexible component can elastically deform, and the heat conduction flexible component can effectively contact the heat dissipation part of the lower housing, ensuring tight contact between the heat conduction flexible component and the heat dissipation part, thereby reliably transmitting to the heat dissipation part heat conducted to the heat conduction flexible component, and ultimately rapidly dissipating heat from the lower housing.

Description

A battery pack Technical Field

[0001] The present application relates to the technical field of battery packs, and more specifically to a battery pack.

[0002] Background of the Invention

[0003] Electronic terminal products such as drones, vacuum cleaners, and power tools have high power requirements. During startup operations (such as takeoff and landing, hovering, acceleration and deceleration), lithium-ion batteries must discharge at high rates. This discharge process releases a large amount of heat, causing the battery to heat up. High temperatures can seriously affect battery performance, lifespan, and safety. Furthermore, electronic terminal products are compact and highly sensitive to energy and weight, making commonly used cooling methods such as fans and water cooling difficult to apply directly. Therefore, it is necessary to implement targeted heat dissipation design for lithium-ion batteries in electronic terminal products to improve their stability.

[0004] Summary of the Invention

[0005] In view of this, the present application provides a battery pack that solves the problem that the thermal conductive components of the battery pack have a complex structure, large weight and volume, and are difficult to be directly applied to battery packs of electronic terminal products of different types and application scenarios.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A battery pack includes: a lower shell formed with a heat dissipation portion; a battery cell module arranged inside the lower shell; a heat conduction component including a heat-conducting flexible member; the heat-conducting flexible member is thermally connected to the battery cell module and abuts the heat dissipation portion.

[0008] In the battery pack provided by the present application, a heat-conducting component is provided, which includes a heat-conducting flexible part that can undergo elastic deformation. On the one hand, the heat-conducting flexible part is heat-conductingly connected to the battery cell module, so that the heat generated by the battery cell module can be quickly conducted to the heat-conducting flexible part; on the other hand, the heat-conducting flexible part can undergo elastic deformation and can fully abut against the heat dissipation part of the lower shell, ensuring the tightness of the contact between the heat-conducting flexible part and the heat dissipation part, so that the heat conducted to the heat-conducting flexible part can be reliably transferred to the heat dissipation part, and finally the heat is dissipated to the outside of the lower shell, thereby realizing the rapid discharge of heat inside the battery pack and preventing the battery pack from having a high temperature during charging and discharging, which may cause safety problems; at the same time, the heat-conducting component of the present application has a simple and compact structure, and fits tightly with the assembly between the battery cell module and the heat dissipation part of the lower shell. It has a small weight and volume, and can be directly applied to battery packs of electronic terminal products of different types and application scenarios, effectively improving the stability of the electronic terminal products.

[0009] BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0011] FIG1 is an exploded view of the battery pack of the present application.

[0012] FIG2 is a schematic structural diagram of the battery pack of the present application.

[0013] FIG3 is a side view of the battery pack of the present application.

[0014] FIG4 is a cross-sectional view taken along line VV in FIG3 .

[0015] FIG5 is a schematic diagram of the heat dissipation transfer structure of the battery pack of the present application.

[0016] FIG6 is a schematic structural diagram of the heat-conducting connector of the present application.

[0017] FIG7 is a schematic structural diagram of the thermally conductive flexible component of the present application.

[0018] FIG8 is a cross-sectional view of the thermally conductive flexible member of the present application.

[0019] FIG9 is a front view of the heat dissipation portion of the present application.

[0020] FIG10 is a top view of the heat dissipation portion of the present application.

[0021] FIG11 is a schematic structural diagram of the heating element of the present application.

[0022] FIG12 shows a folded heating element of the present application.

[0023] FIG13 is a schematic structural diagram of the heating core inside the heating element of the present application.

[0024] FIG14 is a schematic structural diagram of an adhesive member provided on the front side of the heating member of the present application.

[0025] FIG15 is a schematic structural diagram of an adhesive member provided on the reverse side of the heating member of the present application.

[0026] 16 to 25 are schematic diagrams 1 to 10 of the assembly steps of the heating element, the thermally conductive connecting element, and the battery cell unit of the present application.

[0027] Figure 26 is a schematic diagram of the assembly of the semi-finished core unit of the battery pack of this application, the tab welding plate, and the tab isolation foam.

[0028] FIG27 is a schematic diagram of the assembly structure and the control circuit board, wires, and connector terminals in FIG26 of the present application.

[0029] FIG28 is a schematic diagram of the assembly structure and the auxiliary foam component in FIG27 of the present application.

[0030] Figure 29 is a schematic diagram of the assembly of the battery core unit, upper shell and lower shell of the present application.

[0031] FIG30 is an exploded view of the battery pack of the present application in another state.

[0032] In Figures 1 to 30:

[0033] 1. Lower shell; 2. Cell module; 3. Thermal conductive flexible parts; 4. Thermal conductive connectors; 5. Heating element; 6. Tab welding plate; 7. Control circuit board; 8. Tab isolation foam; 9. Insulation sheet; 10. Positive wire; 11. Negative wire; 12. Signal cable; 13. Connector terminal; 14. Control circuit board screw; 15. Connector terminal screw; 16. Rear auxiliary foam; 17. Left auxiliary foam; 18. Right auxiliary foam; 19. Bottom auxiliary foam; 20. Upper shell; 21. Battery pack core unit semi-finished product; 2 2. Battery pack core unit; 101. Heat dissipation unit; 102. Mounting port; 201. Cell; 202. Cell isolation foam; 501. Heating area; 502. Connection area; 503. Insulation coating; 504. Heating core; 505. Electrical connector; 506. Temperature switch; 507. Adhesive; 601. Guide hole; 1011. Body; 1012. Heat dissipation fin; 301. Thermally conductive coating; 302. Thermally conductive flexible core; 303. Second thermally conductive adhesive layer; 401. Abutment; 402. First portion; 403 , second part; 404, first thermally conductive adhesive layer; 5017, first positioning hole; 5026, through hole; 5041, electrical connection end; 10111, second positioning hole; 2011, first battery cell; 2012, second battery cell; 2013, third battery cell; 2014, fourth battery cell; 2015, fifth battery cell; 2016, sixth battery cell; 2017, seventh battery cell; 2018, eighth battery cell; 2019, ninth battery cell; 20110, tenth battery cell; 2011 1. Eleventh battery cell; 20112. Twelfth battery cell; 4011. First thermally conductive connector; 4012. Second thermally conductive connector; 4013. Third thermally conductive connector; 5011. First heating zone; 5012. Second heating zone; 5013. Third heating zone; 5014. Fourth heating zone; 5015. Fifth heating zone; 5016. Sixth heating zone; 5021. First connection zone; 5022. Second connection zone; 5023. Third connection zone; 5024. Fourth connection zone; 5025. Fifth connection zone.

[0034] Modes for Carrying Out the Invention

[0035] The present application provides a battery pack.

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] As shown in Figure 1-30, a battery pack includes a lower housing 1, a cell module 2, and a thermally conductive assembly. Lower housing 1 is formed with a heat dissipation portion 101. Cell module 2 is disposed within lower housing 1. The thermally conductive assembly includes a thermally conductive flexible member 3. Thermally conductive flexible member 3 is thermally connected to cell module 2 and abuts against heat dissipation portion 101.

[0038] By setting up the thermally conductive flexible part 3, on the one hand, the thermally conductive flexible part 3 is thermally connected to the battery module 2, and the heat generated by the battery module 2 can be quickly conducted to the thermally conductive flexible part 3; on the other hand, the thermally conductive flexible part 3 can undergo elastic deformation and can be well abutted against the heat dissipation part 101 of the lower shell 1, ensuring the tightness of the contact between the thermally conductive flexible part 3 and the heat dissipation part 101, and then the heat conducted to the thermally conductive flexible part 3 can be reliably transferred to the heat dissipation part 101, and finally the heat is dissipated to the outside of the lower shell, thereby realizing the rapid discharge of heat from the inside of the battery pack, preventing the battery pack from having a high temperature during charging and discharging, which causes safety problems.

[0039] Furthermore, the heat-conducting component of the present application has a simple and compact structure, and fits tightly between the battery cell module 2 and the heat dissipation portion 101 of the lower shell 1. Moreover, it has a small weight and volume, and can be directly applied to battery packs of electronic terminal products of different types and application scenarios, thereby effectively improving the stability of the electronic terminal products.

[0040] Referring to Figures 6 and 30 , in certain embodiments of the present application, a battery cell module 2 includes a plurality of sequentially arranged battery cells 201. A thermally conductive assembly includes a thermally conductive connector 4. The thermally conductive connector 4 wraps around the battery cells 201 and includes an abutment portion 401 parallel to the direction in which the battery cells 201 are arranged. The thermally conductive flexible member 3 abuts between the abutment portion 401 and the heat dissipation portion 101.

[0041] It should be noted that the thermally conductive connector 4 wraps around at least a portion of the battery cells 201; multiple thermally conductive connectors 4 are arranged in sequence along the arrangement direction of the battery cells 201. Accordingly, the thermally conductive flexible member 3 has a certain size, and only one thermally conductive flexible member 3 is provided to ensure that the abutting portion 401 of each thermally conductive connector 4 abuts against the thermally conductive flexible member 3; alternatively, the number of thermally conductive flexible members 3 provided is the same as the number of thermally conductive connectors 4 provided, and the abutting portion 401 of each thermally conductive connector 4 abuts against the thermally conductive flexible member 3 located opposite it.

[0042] The thermally conductive connector 4 wraps around the battery cell 201, thereby achieving a thermally conductive connection between the thermally conductive connector 4 and the battery cell 201. The two are tightly connected and assembled quickly and easily, ensuring that the thermally conductive connector 4 does not occupy a large volume space of the battery pack.

[0043] There is a gap distance between the heat dissipation part 101 of the lower shell 1 and the thermally conductive connecting part 4; since the thermally conductive flexible part 3 has a certain degree of softness, the thickness of the thermally conductive flexible part 3 is controlled so that its thickness is greater than the above-mentioned gap distance, thereby achieving interference assembly of the thermally conductive flexible part 3 within the above-mentioned gap distance. Not only is the assembly convenient and fast, but it also achieves a tight fitting connection effect between the thermally conductive flexible part 3 and the abutting part 401 of the thermally conductive connecting part 4 and the heat dissipation part 101 of the lower shell 1.

[0044] The thermally conductive connector 4 is wrapped between the battery cells 201, transferring the heat generated by the battery cells 201 to the thermally conductive connector 4. The thermally conductive flexible member 3 abuts the thermally conductive connector 4, transferring the heat from the thermally conductive connector 4 to the thermally conductive flexible member 3. The thermally conductive flexible member 3 abuts the heat dissipation portion 101, further transferring the heat from the thermally conductive flexible member 3 to the heat dissipation portion 101. Finally, the heat dissipation portion 101 transfers the heat to the outside of the lower housing 1 through external air convection, thermal radiation, and other methods, ultimately rapidly reducing the internal temperature of the battery pack.

[0045] Referring to FIG. 6 , in certain embodiments of the present application, the thermal connector 4 includes an integrally connected first portion 402, an abutting portion 401, and a second portion 403. The first portion 402 and the second portion 403 are perpendicular to the arrangement direction of the battery cells 201. The first portion 402, the abutting portion 401, and the second portion 403 define a receiving space; the battery cells 201 are disposed within the receiving space.

[0046] It should be noted that the heat-conducting connector 4 is a foldable sheet structure; when it is assembled with the battery cell 201 , it is folded.

[0047] The edge of the abutting portion 401 adjacent to the first portion 402 is a first folding edge; the edge of the abutting portion 401 adjacent to the second portion 403 is a second folding edge.

[0048] At least one battery cell 201 is stacked on the first portion 402 ; then the thermally conductive connector 4 is folded along the first folding edge and the second folding edge to fold the second portion 403 back onto the battery cell 201 .

[0049] As mentioned above, the first part 402, the abutting part 401, and the second part 403 form a U-shaped folding structure, and the battery cell 201 is located in the accommodating space surrounded by the U-shaped folding structure. The battery cell 201 is wrapped by the thermal conductive connector 4, thereby realizing the thermal connection between the battery cell 201 and the thermal conductive connector 4 conveniently and quickly.

[0050] Please refer to FIG. 6 . In some embodiments of the present application, a first thermally conductive adhesive layer 404 is disposed on both the first portion 402 and the second portion 403 .

[0051] It should be noted that the first thermally conductive adhesive layer 404 can be made of thermally conductive double-sided adhesive or thermally conductive hot melt adhesive.

[0052] By arranging the first thermally conductive adhesive layer 404 on the first part 402 and the second part 403, the first part 402 and the battery cell 201 are fully and tightly fitted, and the second part 403 and the battery cell 201 are fully and tightly fitted, thereby achieving a fixed connection between the thermally conductive connector 4 and the battery cell 201; and utilizing the excellent thermal conductivity of the first thermally conductive adhesive layer 404 to quickly and fully conduct the heat on the battery cell 201 to the thermally conductive connector 4.

[0053] Furthermore, the heat-conducting connecting member 4 is a graphite sheet; the thickness of the graphite sheet is 0.1 mm-1.0 mm.

[0054] Please refer to FIG. 6 , where it should be noted that the length dimension H of the graphite sheet does not exceed the length dimension of the battery cell 201 .

[0055] The thickness of the graphite sheet is related to the required thermal conductivity. The thicker the graphite sheet, the better the thermal conductivity.

[0056] The width J of the first portion 402 or the second portion 403 of the graphite sheet requiring adhesive is not greater than the width of the battery cell 201 .

[0057] The width I of the adhesive-free abutment portion 401 of the graphite sheet is related to the sum of the thicknesses of all the battery cells 201 that the graphite sheet can wrap. For example, in some embodiments, each graphite sheet wraps two battery cells 201, and a layer of cell isolation foam 202 is placed between the two battery cells 201. In this case, I ≥ the sum of the thicknesses of the two battery cells 201 + the thickness of the cell isolation foam 202.

[0058] It should be further explained that the thermally conductive connecting member 4 may also be made of other high thermal conductive materials besides graphite sheets.

[0059] Please refer to FIG. 8 . In certain embodiments of the present application, the thermally conductive flexible member 3 includes a thermally conductive coating layer 301 and a thermally conductive flexible core 302 disposed inside the thermally conductive coating layer 301 .

[0060] The thermally conductive flexible member 3 of the present application has a simple structure; the thermally conductive coating layer 301 increases the strength of the outer surface of the thermally conductive flexible member 3 ; and the thermally conductive flexible core 302 realizes the softness and deformability of the thermally conductive flexible member 3 .

[0061] Please refer to FIG. 7 . In some embodiments of the present application, a second thermally conductive adhesive layer 303 is provided on a side of the thermally conductive flexible member 3 opposite to the abutting portion 401 .

[0062] It should be noted that the second thermally conductive adhesive layer 303 may be made of thermally conductive double-sided adhesive or thermally conductive hot melt adhesive.

[0063] By arranging a second thermally conductive adhesive layer 303 on the thermally conductive flexible part 3, the thermally conductive flexible part 3 and the abutting portion 401 of the thermally conductive connecting part 4 are fully and tightly fitted, thereby achieving a fixed connection between the thermally conductive flexible part 3 and the thermally conductive connecting part 4; and utilizing the excellent thermal conductivity of the second thermally conductive adhesive layer 303, the heat on the thermally conductive connecting part 4 is quickly and fully conducted to the thermally conductive flexible part 3.

[0064] Furthermore, the thermally conductive flexible member 3 is made of graphite foam, wherein the thermally conductive coating layer 301 is a graphite sheet coating layer, and the thermally conductive flexible core 302 is made of thermally conductive foam, and the thermally conductive foam is made of PU foam.

[0065] Please refer to Figures 7-8. It should be noted that along the length of the battery cell, the length of the graphite sheet covering is slightly greater than or equal to the length of the thermally conductive foam, ensuring that the graphite sheet covering completely covers the thermally conductive foam. Furthermore, along the circumference of the thermally conductive foam, the graphite sheet covering covers at least one circumference of the thermally conductive foam. The thickness of the graphite sheet covering is 0.1 mm; the thickness of the thermally conductive foam is positively correlated with the gap between the heat dissipation portion 101 and the abutment portion 401 of the graphite sheet.

[0066] The length direction of the battery cell is the direction indicated by the arrow in FIG7 .

[0067] Along the length direction of the battery cell, the length dimension L of the graphite foam does not exceed the length dimension of the battery cell. The ratio of the length of the graphite foam to the length dimension of the battery cell is in the range of 1 / 6-11 / 12.

[0068] The width M of the graphite foam is greater than or equal to the width I of the thermally conductive connector 4 .

[0069] The assembled structure of the cell module 2 and the thermally conductive connector 4 forms the semi-finished battery pack core unit 21. The thickness of the graphite foam is related to the gap between the heat sink 101 and the abutment portion 401 of the graphite sheet after the semi-finished battery pack core unit is installed in the lower housing 1. The thickness of the graphite foam is generally greater than this gap. This means that an interference fit is employed to ensure a tight connection between the graphite sheet and the heat sink 101.

[0070] Furthermore, the thermally conductive coating layer 301 and the thermally conductive flexible core 302 are connected and fixed via a third thermally conductive adhesive layer.

[0071] Specifically, a third thermally conductive adhesive layer is coated on the circumference of the thermally conductive flexible core 302, and the thermally conductive coating layer 301 is adhered to the third thermally conductive adhesive layer. The coating thickness of the third thermally conductive adhesive layer is 0.05 mm to 1 mm.

[0072] It should be noted that the third thermally conductive adhesive layer is made of thermally conductive hot melt adhesive.

[0073] Limiting the thickness of the thermally conductive hot melt adhesive within the above range can ensure a secure fixation effect between the graphite sheet coating and the thermally conductive foam, avoid waste of the thermally conductive hot melt adhesive, and effectively ensure the thermal transfer effect of the graphite foam.

[0074] As described above, the thermally conductive coating layer 301 and the thermally conductive flexible core 302 are integrally connected, ensuring that the structure of the thermally conductive flexible member 3 is more stable and reliable during operation of the battery pack.

[0075] Furthermore, the thermally conductive flexible part 3 uses graphite foam only as an example of heat transfer in the embodiment of the present application; in addition to the graphite foam in this example scheme, other high-performance thermally conductive materials can also be used between the heat dissipation part 101 and the thermally conductive connector 4 or the battery module 2, such as: high thermal conductivity silicone sheet, thermal conductive filler, thermal conductive double-sided tape, phase change thermal conductive material, thermal conductive glue, thermal conductive potting glue, etc. as heat transfer medium.

[0076] Referring to Figures 1-3 , in some embodiments of the present application, a mounting opening 102 is provided on the side wall of the lower housing 1 ; a heat sink is provided at the mounting opening 102 ; and the heat sink forms the heat dissipation portion 101 .

[0077] It should be noted that the heat sink is generally made of copper, aluminum, or other metal materials with good thermal conductivity. The surface of the heat sink is treated with acid-resistant aluminum or anodized to increase radiation performance and thus improve the heat dissipation efficiency of the heat sink. The lower shell 1 is a plastic shell that serves as a protective unit for the battery pack. The heat sink is the heat dissipation unit of the battery pack and is integrally molded with the lower shell 1 by injection molding. The lower shell 1 is made of plastic material with the heat sink partially embedded to reduce the weight of the lower shell 1.

[0078] Please refer to Figure 9. The length dimension O of the heat sink is smaller than the length dimension of the lower shell 1; the width dimension P of the heat sink is smaller than the width dimension of the lower shell 1. As above, the heat sink can be placed in the lower shell 1 and injection molded into one piece.

[0079] The heat sink and the lower housing 1 are assembled using an integrated in-mold injection molding process to meet IP protection requirements such as waterproofing. Other methods such as hot melt, screws, glue, and double-sided tape can also be used for assembly.

[0080] Referring to Figures 9-10 , in some embodiments, the heat dissipation portion 101 includes a body 1011 and a plurality of heat dissipation fins 1012 formed on the body 1011 and arranged in sequence.

[0081] Furthermore, a second positioning hole 10111 is opened on the main body 1011 ; a plurality of second positioning holes 10111 are arranged circumferentially along the edge of the main body 1011 .

[0082] Providing second positioning holes 10111 in the heat sink body 1011 not only allows the heat sink to be positioned within the injection mold of the lower housing 1, but also ensures a tight connection between the lower housing 1 and the heat sink after the plastic injection molding solidifies, preventing the heat sink from falling and enhancing its stability. The number of second positioning holes 10111 can be increased or decreased depending on actual needs.

[0083] Please refer to FIG. 10 . In certain embodiments of the present application, along the direction in which the heat dissipating fins 1012 extend outward relative to the body 1011 , the thickness R of the body 1011 is greater than 1.2 mm.

[0084] Furthermore, along the sequential arrangement direction of the heat dissipating fins 1012 , the heat dissipating fins 1012 have a thickness dimension; along the direction in which the heat dissipating fins 1012 extend outward relative to the body 1011 , the thickness dimension of the heat dissipating fins 1012 gradually decreases.

[0085] A good heat sink 1012 thickness design must be thick at the heat source part and gradually thinner at the outward extending part; in this way, the heat sink can absorb enough heat from the heat source part and quickly transfer it to the surrounding thinner parts.

[0086] Along the direction in which the heat dissipating fins 1012 extend outward relative to the body 1011, the heat dissipating fins 1012 have a length dimension Q. Q is determined according to the required heat dissipation capacity. Generally speaking, the larger the Q, the stronger the heat dissipation capacity.

[0087] Furthermore, along the sequential arrangement direction of the heat dissipating fins 1012 , the thickness dimension S of the heat dissipating fins 1012 is greater than 1.5 mm.

[0088] Furthermore, the end of the heat dissipation fin 1012 away from the body 1011 is arc-shaped, and the arc angle U thereof is 5°-8°.

[0089] Furthermore, along the sequential arrangement direction of the heat dissipating fins 1012 , the spacing distance T between adjacent heat dissipating fins 1012 is greater than 4 mm.

[0090] As described above, a balance is achieved between the thickness dimension R of the main body 1011 and the length dimension Q of the heat sink 1012; it avoids the thickness dimension S of the heat sink 1012 being too small and the length dimension Q of the heat sink 1012 being too large, which makes it difficult for the arc-shaped end of the heat sink 1012 to transfer heat, so that the heat sink can maximize the heat dissipation efficiency within a certain volume size.

[0091] Referring to Figures 11-12 , in certain embodiments of the present application, a battery module 2 includes a plurality of stacked battery cells 201. The battery pack includes a heating element 5. The heating element 5 forms a plurality of folded spaces along the direction in which the battery cells 201 are arranged. The battery cells 201 are arranged within these folded spaces.

[0092] When the battery pack is at a low temperature, the heating element 5 can generate uniform heat energy and transfer it to the battery cell 201, so that the battery pack is maintained within a certain suitable temperature range and the reaction activity of the internal chemical substances of the battery pack is improved.

[0093] Referring to Figures 11-12, in certain embodiments of the present application, the heating element 5 includes a plurality of heating zones 501 arranged at intervals and a connection zone 502 located between two adjacent heating zones 501. The edge of the connection zone 502 adjacent to the heating zone 501 is a folded edge; the heating element 5 is folded along the folded edge. The plurality of heating zones 501 in the folded heating element 5 are arranged sequentially along the arrangement direction of the battery cells 201, and the connection zone 502 is parallel to the arrangement direction of the battery cells 201. A through hole 5026 is formed in the heating element 5; the folded edge is located at the edge of the through hole 5026 or passes through the through hole 5026.

[0094] It should be noted that the folding edge is located at the edge of the through hole 5026 or passes through the through hole 5026, which means that the through hole 5026 happens to be opened in the connection area 502, and along the spacing direction of the multiple heating zones 501, the width of the through hole 5026 happens to be the same as the width of the connection area 502; or, the opening area of ​​the through hole 5026 exceeds the connection area 502, and the two edges of the through hole 5026 happen to fall into the two heating zones 501 adjacent to the connection area 502, that is, along the spacing direction of the multiple heating zones 501, the width of the through hole 5026 is greater than the width of the connection area 502.

[0095] It should be further explained that the spacing arrangement direction of the plurality of heating zones 501 is as shown in the direction of the arrows in FIG. 14 .

[0096] In the folded heating element 5, the connection area 502 and the two adjacent heating areas 501 enclose a folded space; the heating element 5 forms multiple folded spaces arranged in an S-shaped direction, as shown in Figures 12 and 30. Multiple battery cells 201 are arranged in the multiple folded spaces.

[0097] To ensure that each battery cell 201 is in direct contact with the heating zone 501, preferably one or two battery cells 201 are arranged in each folding space. Furthermore, in the folded heating element 5, battery cells 201 are also arranged on the sides of the heating zones 501 at both ends, away from the folding space.

[0098] Referring to FIG. 12 , in some embodiments, a through hole 5026 is opened in the connection region 502 .

[0099] When the heating element 5 is folded and arranged in sequence along the folding edge of the connecting area 502 in an S-shaped direction, due to the presence of the through hole 5026 on the connecting area 502, the material size of the heating element 5 at the folding edge is effectively reduced, thereby effectively reducing the stress of the heating film at the folding edge (the folding edge is the bending corner of the heating element 5), facilitating folding and assembly, and realizing the continuous bending operation of the heating element 5; and avoiding the heating area 501 from being arched under the action of the stress, ensuring the fitting effect between the heating area 501 and the surface of the battery cell 201, and being able to transfer heat to the battery cell 201 well; at the same time, the through hole 5026 opened reduces the self-gravity of the heating element 5, ensuring the energy density of the battery pack.

[0100] Preferably, the through hole 5026 is opened in the central area of ​​the connection area 502.

[0101] As described above, the uniform force effect of the folded edges on both sides of the connection area 502 is ensured, thereby ensuring the consistency and stability of the assembly of the heating element 5 and the battery cell 201.

[0102] In some embodiments of the present application, corners of the through hole 5026 are chamfered.

[0103] Furthermore, the through hole 5026 is a rectangular through hole; and the corners of the through hole 5026 are rounded.

[0104] As described above, the disadvantage of stress concentration at the corners of the through hole 5026 is avoided, thereby avoiding the disadvantage of the heating element 5 being pulled by external force and the corners of the through hole 5026 being easily torn.

[0105] Please refer to Figures 14-15 . In certain embodiments of the present application, adhesive members 507 are provided on both the front and back sides of the heating zone 501 .

[0106] It should be noted that the adhesive member 507 is a double-sided tape adhered to the heating member 5 .

[0107] By providing double-sided tape, the tight fit between the heating element 5 and the battery cell 201 can be ensured, thereby efficiently transferring the heat generated by the heating element 5 to the battery cell 201; at the same time, it also makes the connection of the entire battery cell module 2 more secure, thereby enhancing the strength of the overall structure.

[0108] Furthermore, the thickness of the double-sided tape is 0.03mm-0.07mm. Preferably, the thickness of the double-sided tape is 0.05mm, or as small as possible, so that the size of the assembled battery pack can be small, which is more in line with the application scenario requirements.

[0109] Furthermore, in addition to double-sided tape, the adhesive member 507 may also be made of hot melt adhesive.

[0110] 14-15 , further, along the length direction of the battery cell 201 , the heating area 501 includes a first end and a second end. Double-sided tape is adhered to the heating area 501 at intervals near the first end and near the second end.

[0111] The above arrangement can, on the one hand, reduce the area of ​​consumables and lower costs; on the other hand, it can make the heating element 5 fit closely with the battery cell as much as possible to provide heat conduction efficiency; after the battery cell 201 is charged and discharged for a cycle, the battery cell 201 will expand and become larger. Usually, the middle part of the battery cell 201 will bulge first. If the double-sided tape is adhered to the middle position of the battery cell 201, it will affect the expansion of the battery pack and there is a safety risk. Therefore, the double-sided tape is only adhered to the two ends of the position interval of the battery cell 201; and under the premise of ensuring a tight connection, its size is as small as possible.

[0112] Please refer to FIG. 11 . In certain embodiments of the present application, a first positioning hole 5017 is formed on the heating element 5 , so that when the heating element 5 is assembled with the battery cell 201 , the first positioning hole 5017 is aligned with a positioning point of an assembly jig.

[0113] It should be noted that the first positioning hole 5017 passes through the heating element 5 ; the first positioning hole 5017 is provided in the heating zone 501 ; and there are multiple first positioning holes 5017 , forming three positioning portions arranged in a triangle.

[0114] Preferably, starting from the starting end of the folded arrangement of the heating element 5, the first heating zone of the heating element 5 is the first heating zone, and the second heating zone 501 is the second heating zone. The first positioning hole 5017 is opened in the second heating zone.

[0115] The assembly jig has positioning protrusions formed at the locating points that mate with the first positioning holes 5017. During assembly, a battery cell 201 is first placed on the assembly jig. The first heating zone of the heater 5 is then placed on the surface of the battery cell 201. At this point, the first positioning holes 5017 in the second heating zone of the heater 5 are aligned with the locating points on the assembly jig, ensuring precise placement of the heater 5 and accurate assembly between the heater 5 and the battery cell 201.

[0116] Furthermore, the heating element 5 is a heating film; the thickness of the heating film ranges from 0.13 mm to 0.5 mm.

[0117] Since the heating power is related to the thickness of the heating film, a heating film with a suitable thickness is selected according to the required heating temperature.

[0118] Please refer to Figures 13 and 11. In certain embodiments of the present application, the heating element 5 includes an insulating coating 503, a heating core 504, an electrical connector 505, and a temperature switch 506. The heating core 504 is disposed in the insulating coating 503 and is covered by the insulating coating 503, and the heating core 504 includes an electrical connection end 5041. The electrical connector 505 is electrically connected to the electrical connection end 5041 and passes through the insulating coating 503. The temperature switch 506 is connected to the electrical connector 505; when the temperature is higher than the first set value, the temperature switch 506 is disconnected, the heating element 5 stops working, and no longer heats; when the temperature is lower than the second set value, the temperature switch 506 is closed, and the heating element 5 starts working and heating.

[0119] It should be noted that the insulating coating 503 is generally made of PI covering film (polyimide) or PET covering film (high-temperature resistant polyester), which is a soft and flexible insulating substrate that wraps the heating core 504 for the purpose of isolation and insulation protection.

[0120] The heating core 504 has two electrical connection terminals 5041, one positive and one negative. Correspondingly, two electrical connectors 505 are provided, one positive and one negative. A relief hole is provided in the insulating coating 503, positioned opposite the electrical connection terminals 5041 to facilitate electrical connection between the positive and negative electrical connectors, and between the positive and negative electrical connectors. The heating current is then supplied to the heating core 504 via the positive and negative electrical connectors.

[0121] The heating core 504 includes multiple heating parts that provide heat; the multiple heating parts are arranged one-to-one with the multiple heating areas 501. The connection area 502 is an area that does not provide heat, but wiring needs to be arranged in the connection area 502 to connect the multiple heating parts in series.

[0122] It should be noted that the temperature switch is composed of a heat-conducting plastic shell, a bimetallic element with silver alloy contacts welded to it, a conductive bracket, an insulating fixing seat, a static contact piece, and a heat-resistant wire. When the current passes through the bimetallic element with impedance and encounters abnormal operation, as the current increases or the ambient temperature rises to the first set value, the bimetallic element quickly operates, the silver alloy contact opens, disconnects the static contact piece, and cuts off the charging circuit of the heating element 5; when the ambient temperature cools to the second set value, the silver alloy contact of the bimetallic element automatically closes and connects to the static contact piece, connecting the charging circuit of the heating element 5, restoring normal working state, and playing a role in thermal protection of the battery pack. Furthermore, the second set value of the temperature is within the safe operating temperature range of the battery pack.

[0123] By setting the temperature switch 506, the temperature of the battery pack during charging and discharging can be controlled within the suitable working range of the battery pack, that is, between the second set value and the first set value, thereby improving the electrical performance, safety and life of the battery pack.

[0124] Furthermore, the first set value is greater than the second set value; the first set value does not exceed 60°C; and the second set value is not less than 15°C.

[0125] Preferably, the first set value is 60° C.; the second set value is 15° C.; that is, the suitable operating temperature range of the battery pack during charging and discharging is 15° C.-60° C.

[0126] Please refer to FIG. 11 . In some embodiments of the present application, the electrical connection end 5041 is formed in the connection region 502 .

[0127] The electrical connection end 5041 of the heating core 504 is formed in the connection area 502, so that the electrical connection module of the folded heating element 5 can be integrated at the end of the heating element 5 and located outside the folding space, which is not only convenient for connection with an external power supply, but also does not interfere with the folding setting of the heating element 5, nor does it affect the close fitting effect between the heating area 501 and the surface of the battery cell 201; at the same time, it does not occupy the area of ​​the heating part of the heating core 504, thereby ensuring the comprehensive and uniform heating effect of the heating area 501 on the battery cell 201.

[0128] Preferably, counting from the starting end of the folded setting of the heating element 5, the first connection area 502 of the heating film is the first connection area; the two electrical connection ends 5041 of the heating core 504 are both formed in the first connection area.

[0129] In certain embodiments of the present application, the heating core 504 is a heating resistance wire.

[0130] Please refer to FIG13 , where it should be noted that only one heating resistor wire is used in the heating film of the present application. Both the leading end and the trailing end of the heating resistor wire are electrical connection terminals 5041 .

[0131] The head end of the heating resistance wire is fixed in the first connection area; then the heating resistance wire is folded and arranged in different heating parts in sequence, and finally ensures that the tail end of the heating resistance wire can return to and be fixed in the first connection area; the fixed position of the head end of the heating resistance wire is opposite to the fixed position of the tail end of the heating resistance wire.

[0132] Heating resistor wires are generally made of SUS304 (stainless steel), copper, or alloys. According to the electric heat rate formula: P = RI^2, and the resistance law formula: R = ρL / S, where ρ is the resistivity of the material of the heating resistor wire, L is the length of the heating resistor wire, and S is the cross-sectional area of ​​the heating resistor wire; therefore, if you want the heating temperature of heating zone 501 to be higher, you can reduce the cross-sectional area of ​​the heating resistor wire. Therefore, by controlling the cross-sectional area of ​​the heating resistor wire, you can regulate the heating temperature of heating zone 501, so that the heating temperature of heating element 5 on battery module 2 can be evenly distributed.

[0133] In some embodiments, the electrical connector 505 is a connecting wire.

[0134] It should be noted that the connecting wire is generally made of extra-soft silicone wire; its material is soft and easy to assemble and weld with the electrical connection end 5041 of the heating core 504.

[0135] Furthermore, the electrical connector 505 can also be replaced with an FPC connecting board; the FPC connecting board is electrically connected to the control circuit board 7 to connect to the external circuit through the control circuit board 7 to provide heating current for the heating core 504.

[0136] In some embodiments, an insulating protective layer is provided at the connection between the electrical connector 505 and the electrical connection terminal 5041. A first insulating protective layer is provided at the weld between the positive connecting wire and the head end of the heating resistor wire; a second insulating protective layer is provided at the weld between the negative connecting wire and the tail end of the heating resistor wire.

[0137] As described above, short circuit contact between two adjacent electrical connectors 505 , ie, the positive electrode connecting wire and the negative electrode connecting wire, can be avoided.

[0138] Furthermore, insulating glue is applied to the electrical connection between the electrical connector 505 and the electrical connection end 5041 ; the insulating glue is cured to form an insulating protective layer.

[0139] Please refer to Figure 11, where it should be noted that the width dimension of the heating zone 501 is A; the width dimension of the connecting zone 502 is B; the length dimension of the heating element 5, the length dimension of the heating zone 501, and the length dimension of the connecting zone 502 are all the same, which is C.

[0140] The length C of the heating zone 501 does not exceed the length of the battery cell 201 ; the width A of the heating zone 501 does not exceed the width of the battery cell 201 .

[0141] Furthermore, the width B of the connection area 502 is greater than or equal to the sum of the thicknesses of all the battery cells 201 and all the battery cell isolation foams 202 that can be accommodated in the folding space.

[0142] As mentioned above, it can be ensured that the size of the heating element 5 does not extend beyond the edge of the battery cell 201, thereby ensuring the energy density of the battery pack; and it can be ensured that the folded space formed by the folding of the heating element 5 is just adapted to the number of battery cells 201 that need to be accommodated, thereby ensuring the assembly adaptability of the heating element 5 and the battery cell 201.

[0143] In certain embodiments of the present application, the heating zones 501 of the heating element 5 have different heating powers. Because the battery module 2 is composed of multiple stacked battery cells 201, the center battery cell 201 receives greater heat than the battery cells 201 on the sides. To ensure uniform heating, the heating powers of the different heating zones 501 of the heating element 5 are designed to be inconsistent. Generally, the heating power of the heating zones 501 at the ends of the heating element 5 is greater than the heating power of the heating zone 501 in the center area of ​​the heating element 5.

[0144] It should be noted that the heating element 5 includes six heating zones 501 spaced apart. The sum of the heating powers of the heating zones 501 at both ends of the heating element 5 is E; the sum of the heating powers of the four heating zones 501 in the middle region of the heating element 5 is F. Therefore, the heating power E / 2 of the heating zones 501 at the edges of the heating element 5 is greater, while the heating power F / 4 of the heating zones 501 in the middle region of the heating element 5 is less.

[0145] The connection area 502 does not need to heat the battery cell 201, but wiring needs to be arranged in this area to connect multiple adjacent heating areas 501 in series; the heating power of the wiring of each connection area 502 is G; control G to satisfy G=E / 2-F / 4.

[0146] Three thermally conductive connectors 4 are selected; according to the assembly sequence, the three thermally conductive connectors 4 are respectively a first thermally conductive connector 4011 , a second thermally conductive connector 4012 , and a third thermally conductive connector 4013 .

[0147] A heating element 5 with 6 heating zones 501 is selected; in accordance with the assembly order, the heating element 5 includes a first heating zone 5011, a first connecting zone 5021, a second heating zone 5012, a second connecting zone 5022, a third heating zone 5013, a third connecting zone 5023, a fourth heating zone 5014, a fourth connecting zone 5024, a fifth heating zone 5015, a fifth connecting zone 5025, and a sixth heating zone 5016.

[0148] The above-mentioned thermal conductive connector 4, heating element 5 and 12 battery cells 201 are assembled. According to the assembly order, the 12 battery cells 201 are respectively the first battery cell 2011, the second battery cell 2012, the third battery cell 2013, the fourth battery cell 2014, the fifth battery cell 2015, the sixth battery cell 2016, the seventh battery cell 2017, the eighth battery cell 2018, the ninth battery cell 2019, the tenth battery cell 20110, the eleventh battery cell 20111 and the twelfth battery cell 20112.

[0149] Please refer to Figures 16-25 , the assembly steps of the three thermally conductive connectors 4 , the heating element 5 and the twelve battery cells 201 are as follows:

[0150] Step 1: First, position the first battery cell 2011 on the assembly jig; Step 2: Align the first positioning hole 5017 on the heating element 5 (as shown in Figure 11) with the positioning point on the assembly jig, and adhere the back of the first heating zone 5011 to the first battery cell 2011; Step 3: Adhere the first portion 402 of the first thermally conductive connector 4011 to the front of the first heating zone 5011 (steps 1-3, as shown in Figure 16); Step 4: Overlay the second battery cell 2012 on the first portion 402 of the first thermally conductive connector 4011; Step 5: Apply the battery cell isolation foam 202 to the surface of the second battery cell 2012; Step 6: Overlay the third battery cell 2013 (steps 4-6, as shown in Figure 17) ; Step 7: Fold the two folded edges of the abutting portion 401 of the first heat-conducting connector 4011 in sequence, so that the second portion 403 of the first heat-conducting connector 4011 is folded back to the surface of the third battery cell 2013; Step 8: Fold the two folded edges of the first connecting area 5021 in sequence, so that the heating element 5 is folded back to the surface of the second portion 403 of the first heat-conducting connector 4011. At this time, the front side of the second heating area 5012 is adhered to the surface of the second portion 403 of the first heat-conducting connector 4011; Step 9: Overlay the fourth battery cell 2014 on the back side of the second heating area 5012 (steps 7-9, as shown in Figure 18); Step 10: Apply the battery cell isolation foam 202 on the surface of the fourth battery cell 2014; Step 11: Overlay Add the fifth battery cell 2015; Step 12: Fold the two folded edges of the second connecting area 5022 in sequence, so that the heating element 5 is folded back to the surface of the fifth battery cell 2015. At this time, the back of the third heating area 5013 is bonded to the fifth battery cell 2015 (steps 10-12, as shown in Figure 19); Step 13: Bond the first part 402 of the second thermally conductive connector 4012 to the front of the third heating area 5013; Step 14: Stack the sixth battery cell 2016 on the first part 402 of the second thermally conductive connector 4012; Step 15: Apply the battery isolation foam 202 on the surface of the sixth battery cell 2016 (steps 13-15, as shown in Figure 20); Step 16: Overlay the seventh battery cell 201 7; Step 17: Fold the two folded edges of the abutting portion 401 of the second thermally conductive connector 4012 in sequence so that the second portion 403 of the second thermally conductive connector 4012 is folded back to the surface of the seventh battery cell 2017; Step 18: Fold the two folded edges of the third connecting area 5023 in sequence so that the heating element 5 is folded back to the surface of the second portion 403 of the second thermally conductive connector 4012. At this time, the front side of the fourth heating area 5014 is bonded to the surface of the second portion 403 of the second thermally conductive connector 4012 (steps 16-18, as shown in Figure 21); Step 19: Overlay the eighth battery cell 2018 on the back side of the fourth heating area 5014; Step 20: Apply the battery cell isolation foam 202 to the surface of the eighth battery cell 2018;Step 21: Overlay the ninth battery cell 2019 (steps 19-21, as shown in FIG22); Step 22: Fold the two folded edges of the fourth connecting area 5024 in sequence, so that the heating element 5 is folded back to the surface of the ninth battery cell 2019. At this time, the back of the fifth heating area 5015 is bonded to the ninth battery cell 2019; Step 23: Bond the first part 402 of the third thermally conductive connector 4013 to the front of the fifth heating area 5015; Step 24: Overlay the tenth battery cell 20110 on the first part 402 of the third thermally conductive connector 4013 (steps 22-24, as shown in FIG23); Step 25: Apply the battery cell isolation foam 202 on the surface of the tenth battery cell 20110; Step 26: Overlay the eleventh battery cell 20111 Step 27: Fold the two folded edges of the contact portion 401 of the third thermally conductive connector 4013 in sequence so that the second portion 403 of the third thermally conductive connector 4013 is folded back onto the surface of the eleventh battery cell 20111 (Steps 25-27, as shown in FIG. 24 ). Step 28: Fold the two folded edges of the fifth connecting area 5025 in sequence so that the heating element 5 is folded back onto the surface of the second portion 403 of the third thermally conductive connector 4013. At this time, the front side of the sixth heating area 5016 is bonded to the surface of the second portion 403 of the third thermally conductive connector 4013. Step 29: Overlay the twelfth battery cell 20112 on the back side of the sixth heating area 5016, thus completing the assembly of the heating element 5 and the twelve battery cells 201 (Steps 28-29, as shown in FIG. 25 ).

[0151] Through the above assembly steps, a semi-finished battery pack core unit 21 is obtained, which includes an integrally structured battery cell module 2, three folded heat-conducting connectors 4, and a folded heating element 5.

[0152] Referring to Figures 26-27 and 30 , in certain embodiments of the present application, the battery pack includes a tab welding plate 6 ; the tab welding plate 6 is located above the battery cell module 2 . The tab welding plate 6 is provided with a guide hole 601 ; the electrical connector 505 of the heating element 5 passes through the guide hole 601 .

[0153] It should be noted that the tab welding plate 6 is provided with tab holes arranged at intervals; a welding platform is formed between adjacent tab holes; and a nickel brick is provided on the welding platform.

[0154] After the heating element 5 and the battery cell 201 are assembled to form the semi-finished battery core unit 21, a tab welding plate 6 is placed above the semi-finished battery core unit 21 (i.e., above the battery cell module 2). The tabs in the battery cell module 2 are inserted through the tab holes of the tab welding plate 6. The tabs are then folded flat and aligned with the nickel bricks on the welding platform of the tab welding plate 6, and then connected using laser or resistance welding.

[0155] The electrical connector 505 on the heating element 5 is passed through the guide hole 601 , which plays a fixing role in leading the electrical connector 505 outward.

[0156] Furthermore, an insulating sheet 9 is applied on the tab welding plate 6. The purpose of the insulating sheet 9 is to prevent the tab welding point from contacting other objects and causing a short circuit.

[0157] Tab isolation foam 8 is provided and inserted into the spaces between adjacent tabs in the plurality of battery cells 201. Tab isolation foam 8 is located at the bottom of tab welding plate 6. The provision of tab isolation foam 8 not only isolates the tabs, but also prevents the risk of tab contact and short circuit due to external vibrations. It also supports the tab welding plate 6, preventing the risk of short circuit due to contact between the tab welding plate 6 and the battery cells 201, and also strengthens the overall fixing effect.

[0158] Referring to FIG. 27 and FIG. 30 , in certain embodiments of the present application, the battery pack includes a control circuit board 7 . The electrical connector 505 of the heating element 5 is electrically connected to the control circuit board 7 .

[0159] It should be noted that the tab welding plate 6 is welded to the control circuit board 7 using a signal cable 12 ; its purpose is to collect and feedback the working condition information of the battery module 2 .

[0160] The electrical connector 505 is electrically connected to the control circuit board 7, which can avoid setting up complex and lengthy connection lines on the heating element 5 to connect with the external circuit. The electrical connector 505 can be electrically connected to the external circuit through the control circuit board 7, thereby powering the heating element 5.

[0161] Furthermore, a positive electrode wire 10 and a negative electrode wire 11 are welded to the tab welding plate 6; the positive electrode wire 10 is welded to the positive electrode welding position of the tab welding plate 6, and the negative electrode wire 11 is welded to the negative electrode welding position of the tab welding plate 6; the purpose is to enable the battery module 2 to be charged and discharged normally.

[0162] Connector terminals 13 are welded on the control circuit board 7 and serve as ports for external connection.

[0163] Please refer to Figures 28 and 30. A protective component is provided on the outer surface of the battery cell module 2. The protective component is an auxiliary foam component applied to the outer surface of the battery cell module 2. The auxiliary foam component includes rear auxiliary foam 16, left auxiliary foam 17, right auxiliary foam 18, and bottom auxiliary foam 19. The provision of the protective component prevents the assembly assembly from being punctured or scratched by the lower housing 1 when it is installed. It also provides a cushioning and shock-absorbing effect, preventing the battery pack from being subjected to external vibrations, which could result in the battery cell module 2 being punctured or scratched by the lower housing 1.

[0164] Furthermore, a notch is dug in the upper left corner of the rear auxiliary foam 16 to accommodate the temperature switch on the heating element 5. The temperature switch is located on the side of the battery module 2, and the thickness of the rear auxiliary foam 16 can protect the temperature switch from being squeezed by the lower housing 1.

[0165] Install the control circuit board screws 14 on the control circuit board 7; finally, assemble the thermally conductive flexible member 3 into the lower shell 1, aligning the thermally conductive flexible member 3 with the abutment portion 401 of the thermally conductive connector 4, thereby completing the assembly of the battery pack core unit 22.

[0166] The above description is merely an embodiment of the present application, and the battery pack core unit 22 built into the battery pack of the present application may have various modifications and variations.

[0167] Referring to Figures 29-30, the control circuit board 7 is securely connected to the upper housing 20 via the control circuit board screws 14. The completed battery pack core unit is inserted into the lower housing 1, and the connector terminal screws 15 are inserted through the upper housing 20. The connector terminals 13 are securely attached to the upper housing 20 via the connector terminal screws 15. Finally, the upper housing 20 is placed over the lower housing 1 and connected via laser welding, ultrasonic welding, gluing, or other methods. This completes the assembly of the entire battery pack.

[0168] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0169] It should also be noted that in the device of the present application, each component can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as equivalent solutions of the present application.

[0170] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0171] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0172] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include: The lower housing (1) is formed with a heat dissipation portion (101); A battery cell module (2) is arranged inside the lower housing (1); The heat-conducting component comprises a heat-conducting flexible component (3); the heat-conducting flexible component (3) is heat-conductingly connected to the battery core module (2) and abuts against the heat dissipation portion (101).

2. The battery pack according to claim 1, characterized in that: The battery cell module (2) comprises a plurality of battery cell monomers (201) arranged in sequence; the heat conductive component further comprises a heat conductive connector (4); the heat conductive connector (4) wraps each battery cell monomer (201) among the plurality of battery cell monomers (201); The heat-conducting connecting member (4) comprises an abutting portion (401); the abutting portion (401) is parallel to the sequential arrangement direction of the battery cell monomers (201); and the heat-conducting flexible member (3) abuts between the abutting portion (401) and the heat dissipation portion (101).

3. The battery pack according to claim 2, characterized in that: The heat-conducting connecting piece (4) comprises a first portion (402), the abutting portion (401), and a second portion (403) which are integrally connected; The first portion (402) and the second portion (403) are perpendicular to the sequential arrangement direction of the battery cell monomers (201); The first portion (402), the abutting portion (401), and the second portion (403) form a containing space; the battery cell (201) is arranged in the containing space.

4. The battery pack according to claim 3, characterized in that: A first heat-conducting adhesive layer (404) is disposed on both the first part (402) and the second part (403); and / or, The heat-conducting connecting piece (4) is a graphite sheet; the thickness of the graphite sheet is 0.1 mm-1.0 mm.

5. The battery pack according to any one of claims 2 to 4, characterized in that: The thermally conductive flexible member (3) comprises a thermally conductive coating layer (301) and a thermally conductive flexible core (302) arranged inside the thermally conductive coating layer (301).

6. The battery pack according to claim 5, characterized in that: A second heat-conducting adhesive layer (303) is provided on the side of the heat-conducting coating layer (301) opposite to the abutting portion (401); and / or, The heat-conductive coating layer (301) is a graphite sheet coating layer; the heat-conductive flexible core (302) is a heat-conductive foam; and / or, The thermally conductive flexible core (302) is coated with a third thermally conductive adhesive layer on its circumference; the thermally conductive coating layer (301) is adhered to the third thermally conductive adhesive layer.

7. The battery pack according to any one of claims 1 to 6, characterized in that: A mounting opening (102) is provided on the side wall of the lower housing (1); a heat sink is provided at the mounting opening (102); and the heat sink forms the heat dissipation portion (101); and / or, The heat dissipation portion (101) comprises a main body (1011) and a plurality of heat dissipation fins (1012) formed on the main body (1011) and arranged in sequence.

8. The battery pack according to claim 7, characterized in that: Along the direction in which the plurality of heat dissipation fins (1012) extend outwardly relative to the body (1011), the body (1011) has a thickness dimension; the thickness dimension of the body (1011) is greater than 1.2 mm; and / or, Along the sequential arrangement direction of the plurality of heat dissipation fins (1012), each heat dissipation fin (1012) in the plurality of heat dissipation fins (1012) has a thickness dimension; along the direction in which the heat dissipation fins (1012) extend outwardly relative to the body (1011), the thickness dimension of the heat dissipation fins (1012) gradually decreases; and / or, The end of each heat dissipation fin (1012) in the plurality of heat dissipation fins (1012) away from the body (1011) is arc-shaped, and the arc angle is 5°-8°; and / or, Along the sequential arrangement direction of the plurality of heat dissipation fins (1012), each heat dissipation fin (1012) in the plurality of heat dissipation fins (1012) has a thickness dimension; the thickness dimension of the heat dissipation fin (1012) is greater than 1.5 mm; and / or, Along the sequential arrangement direction of the plurality of heat dissipation fins (1012), the spacing distance between adjacent heat dissipation fins (1012) in the plurality of heat dissipation fins (1012) is greater than 4 mm.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery cell module (2) comprises a plurality of battery cell units (201) arranged in a stacked manner; The battery pack comprises a heating element (5); along the sequential arrangement direction of the plurality of battery cells (201), the heating element (5) forms a plurality of folding spaces; The plurality of battery cell units (201) are arranged in the plurality of folding spaces.

10. The battery pack according to claim 9, characterized in that: The heating element (5) comprises a plurality of heating zones (501) arranged at intervals and a connecting zone (502) located between two adjacent heating zones (501); The plurality of heating areas (501) are sequentially arranged along the arrangement direction of the plurality of battery cell monomers (201), and the connection area (502) is parallel to the arrangement direction of the plurality of battery cell monomers (201); Wherein, the edge of the connecting area (502) adjacent to the multiple heating areas (501) is a folded edge; a through hole (5026) is provided on the heating element (5); and the folded edge is located at the edge of the through hole (5026) or passes through the through hole (5026).

11. The battery pack according to claim 10, characterized in that: The corners of the through hole (5026) are chamfered; and / or, The front and back surfaces of each heating zone (501) in the plurality of heating zones (501) are provided with adhesive members (507); and / or, Along the length direction of each battery cell (201) in the plurality of battery cells (201), each heating zone (501) in the plurality of heating zones (501) comprises a first end and a second end; adhesive members (507) are arranged at intervals near the first end and near the second end of the heating zone (501); and / or, The heating element (5) is provided with a first positioning hole (5017); and / or, The heating element (5) is a heating film; the thickness of the heating film is 0.13 mm-0.5 mm.

12. The battery pack according to claim 10 or 11, characterized in that: The heating element (5) comprises: Insulating coating (503); A heating core (504) is disposed in the insulating coating layer (503) and includes an electrical connection end (5041); An electrical connector (505) electrically connected to the electrical connection end (5041); A temperature switch (506) is connected to the electrical connector (505); when the temperature is higher than a first set value, the temperature switch (506) is disconnected and the heating element (5) stops heating; when the temperature is lower than a second set value, the temperature switch (506) is closed and the heating element (5) starts heating.

13. The battery pack according to claim 12, characterized in that: The heating core (504) is a heating resistance wire; and / or, The electrical connection end (5041) is formed in the connection area (502); and / or, The electrical connector (505) is a connecting wire; and / or, An insulating protective layer is provided at the connection between the electrical connector (505) and the electrical connection end (5041).

14. The battery pack according to claim 12 or 13, characterized in that: The battery pack comprises a tab welding plate (6); the tab welding plate (6) is located above the battery cell module (2); a guide hole (601) is provided on the tab welding plate (6); the electrical connector (505) passes through the guide hole (601); and / or, The battery pack comprises a control circuit board (7); the electrical connector (505) is electrically connected to the control circuit board (7).

15. The battery pack according to any one of claims 10 to 14, characterized in that: The through hole (5026) is opened in the connection area (502), and along the spacing arrangement direction of the multiple heating areas (501), the width of the through hole (5026) is the same as the width of the connection area (502); or, the opening area of ​​the through hole (5026) exceeds the connection area (502), and the two edges of the through hole (5026) fall into two heating areas (501) adjacent to the connection area (502), respectively.

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