Battery pack and electric device

Abstract

The present invention discloses a battery pack, which comprises: a battery cell group, which comprises a plurality of battery cells arranged in parallel, and the plurality of battery cells are provided with tabs on the electrode side of the battery cell group; on the electrode side, one part of the tabs are internal connection tabs, and the other part of the tabs are external connection tabs; the internal connecting tabs between the adjacent battery cells are in electric contact; the electric control board is located on the electrode side of the battery cell group, a first electric connection bar is arranged on the electric control board, the first electric connection bar is provided with a protruding part protruding towards the battery cell group, and the protruding part is in conductive contact with the external connection tab. According to the battery cell, the protruding part is arranged, so that the extension of the external connecting tab is avoided, the battery cell with a unified specification can be effectively realized, the assembly difficulty can be effectively reduced, and the assembly cost can be effectively reduced. Therefore, the problem of high cost of the current battery pack can be effectively solved. The invention also discloses an electric device comprising the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and more specifically, to a battery pack, and also to an electrical device comprising the battery pack. Background Art

[0002] Soft-pack batteries are increasingly used in power tools, vacuum cleaners, floor scrubbers, drones and other products due to their excellent high-rate discharge characteristics, low heat generation, high safety and light weight. Garden tool batteries and power tool batteries have complex working conditions and application scenarios and require higher mechanical reliability. How to improve the space utilization of soft-pack batteries, increase capacity, and reduce weight while taking into account mechanical safety has become a problem that needs to be solved.

[0003] Current battery packs often require two or even more specifications of battery cells due to the different connection objects of the battery tabs. This results in very high costs, including not only manufacturing costs but also assembly costs.

[0004] In summary, how to effectively solve the current problem of high battery pack costs is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the first object of the present invention is to provide a battery pack, which can effectively solve the problem of relatively high cost of current battery packs. The second object of the present invention is to provide an electrical device including the above-mentioned battery pack.

[0006] In order to achieve the above first object, the present invention provides the following technical solutions:

[0007] A battery pack, comprising:

[0008] A battery cell group comprises a plurality of battery cells arranged in parallel, wherein the plurality of battery cells are all provided with tabs on the electrode side of the battery cell group; on the electrode side, among the tabs: a portion of the tabs are internal connection tabs, and another portion of the tabs are external connection tabs; the internal connection tabs of adjacent battery cells are in electrical contact with each other;

[0009] The electric control board is located at the electrode side of the battery cell group. The electric control board has a first electrical connection row. The first electrical connection row has a protrusion protruding toward the battery cell group. The protrusion is in conductive contact with the external connection tab.

[0010] In the above-mentioned battery pack, for the first electrical connection row connected to the external connection pole ear, a straight plate structure is no longer adopted, but a protrusion is provided, and it protrudes toward the battery cell group to connect the external connection pole ear, so that the external connection pole ear does not need to be extended due to the height limit of the internal connection pole ear, and can achieve electrical contact with the corresponding first electrical connection row. Compared with the single provision of a battery cell with a longer pole ear, the additional cost of extending the first electrical connection row is very small. Moreover, when assembling battery cells of various specifications, the assembly cost is very high because they need to be assembled in sequence, while the assembly cost of battery cells of uniform specifications is significantly lower. Therefore, a protrusion is provided to avoid the extension of the external connection pole ear, which can effectively achieve battery cells of uniform specifications, thereby effectively reducing the difficulty of assembly and effectively reducing the assembly cost. In summary, the battery pack can effectively solve the problem of relatively high cost of current battery packs.

[0011] In some technical solutions, the external connecting electrode lug is the electrode lug located in the battery cell on the outside; along the direction away from the battery cell body, the extended length of the internal connecting electrode lug is consistent with the extended length of the external connecting electrode lug.

[0012] In some technical schemes, the first electrical connection row also includes a base portion, the base portion is located on the side of the board body of the electric control board away from the battery cell group, and the protrusion includes an electrical connection portion and an intermediate connection portion; the electrical connection portion is located on the side of the board body of the electric control board close to the battery cell group and connected to the external connection ear; the two ends of the intermediate connection portion are respectively integrally connected to the base portion and the electrical connection portion.

[0013] In some technical schemes, in the orientation direction of the electrode side, the contact positions where the two connected internal connecting ears are in electrical contact with each other are arranged at the same height as the electrical connection part; the bent portion of the external connecting ear is overlapped on the side of the electrical connection part away from the battery cell group body and there is conductive contact between them.

[0014] In some technical schemes, there is at least one electrical connection row, at least one of which is a first electrical connection row, and at least one of which includes a suspended section and a pressed-down section; the suspended section is suspended on the side of the electric control board body away from the battery cell group, electrical components are arranged in the gap between the suspended section and the electric control board body, and the pressed-down section is in contact with the electric control board body.

[0015] In some technical solutions, at least one of the downward pressing sections is a slot-shaped section, and both ends of at least one of the slot-shaped sections are respectively connected to the suspended sections; at least electrical components are arranged inside the slot-shaped section; and the electrical connecting bar is a copper bar.

[0016] In some technical solutions, an external terminal is included, a signal module and a charging module are integrated on the electric control board, the external terminal is electrically connected to the signal module through a signal connection bus, and the external terminal is electrically connected to the charging module through a charging connection bus.

[0017] In some technical schemes, in the parallel direction of the battery cells, the signal connection bar, the charging connection bar, the first pole connection bar, and the second pole connection bar are provided on one side of the battery cell group, one of the first pole connection bar and the second pole connection bar is connected to the positive output copper bar of the electric control board, and the other is connected to the negative output copper bar of the electric control board; the signal connection bar, the charging connection bar, the first pole connection bar, and the second pole connection bar are all connected to the ports corresponding to the external terminals.

[0018] In some technical solutions, the signal connection bar, the charging connection bar, the first pole connection bar, and the second pole connection bar are fixed by a polyimide film; the second pole connection bar includes an internal connection segment and an external connection segment that are disconnected, and a fuse is arranged between the internal connection segment and the external connection segment.

[0019] In some technical solutions, the internal connection ends on the signal connection bar, the charging connection bar, the first pole connection bar, and the second pole connection bar are plugged into the corresponding electrical connection bars on the electrical control board, and the side surfaces of the internal connection ends are embossed surfaces, which are soldered to the corresponding electrical connection bars on the electrical control board.

[0020] In some technical schemes, an electrical connecting sheet is also included, which includes a connecting plate portion, a contraction portion and a buckle portion arranged in sequence, and a voltage signal collection pad that matches the buckle portion is provided at the edge of the electric control board; the buckle portion is arranged in parallel with the connecting plate portion and is located on the side of the electric control board away from the battery cell group; the cross-section of the contraction portion is smaller than the cross-section of the connecting plate portion and smaller than the cross-section of the buckle portion; the internal connecting ears all form a bending portion; the connecting plate portion is in electrical contact with the two internal connecting ears that are in conductive contact with each other; along the direction of the electrode side, the connecting plate portion, the bending portion of one internal connecting ear and the bending portion of another internal connecting ear are stacked in sequence.

[0021] In some technical solutions, the thickness T of the electrical connection sheet is: 0.12mm≤T≤0.3mm; the width W of the contraction portion along the bending line is 0.7mm≤W≤2.5mm; and the electrical connection sheet is a nickel sheet.

[0022] In some technical schemes, a first buffer pad is arranged between at least one group of adjacent battery cells, and the first buffer pad forms a closed cavity; the first buffer pad is ring-shaped, and the ring edge of the first buffer pad is in sealing contact with the battery cells on both sides, and the cavity in the ring center of the first buffer pad is the closed cavity.

[0023] In some technical schemes, a thermally conductive sheet is arranged between at least one group of adjacent battery cells, and the thermally conductive sheet is in thermal contact with the battery cells on both sides; the first buffer pads and the thermally conductive sheets are alternately arranged in the gaps between each adjacent battery cell; at least one group of two adjacent thermally conductive sheets are connected on the outside of the battery cell group to form a cylindrical structure.

[0024] In some technical solutions, second buffer pads are provided on both sides of the battery cell group along the parallel direction of the battery cells, and the side of the second buffer pad away from the battery cell group is covered with an outer layer structure with a friction coefficient lower than that of the second buffer pad.

[0025] In some technical solutions, the outer layer structure is a release film.

[0026] In some technical solutions, a bracket is further included, the bracket is provided with a accommodating cavity, the battery cell group is located in the accommodating cavity, the battery cell group and the accommodating cavity are filled with heat-conducting potting glue, the bracket is embedded with a heat dissipation structure, one side of the heat dissipation structure faces the accommodating cavity to contact the potting glue, and the other side faces the outside of the bracket and is provided with heat dissipation fins.

[0027] In some technical solutions, the edge of the electric control board has a sawtooth structure, and each tooth of the sawtooth structure is respectively provided with a voltage signal collection pad, and the voltage signal collection pad is connected to the electrical connection sheet.

[0028] In some technical solutions, in the direction of the electrode side, the corresponding side wall of the accommodating cavity forms an opening with a size matching that of the battery cell group, and the edge of the opening is chamfered.

[0029] In some technical solutions, in the parallel direction of the battery cell tabs, the gap L between the battery cell group and the cavity wall of the accommodating cavity is: L≤2mm; the hardness H of the potting glue is: Shore A35 degrees≤H≤Shore A85 degrees.

[0030] In order to achieve the second objective, the present invention further provides an electrical device, which includes any of the above-mentioned battery packs and a housing, wherein the battery pack is located inside the housing. Since the above-mentioned battery pack has the above-mentioned technical effects, the electrical device having the battery pack should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of a battery pack provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of an exploded structure of a battery cell group and an electric control board combination structure provided by an embodiment of the present invention;

[0035] Figure 4 for Figure 3 The enlarged structural diagram at A in the middle;

[0036] Figure 5 A schematic diagram of the structure of a battery cell group and an electric control board combination structure provided by an embodiment of the present invention;

[0037] Figure 6 for Figure 5 The enlarged structural diagram at B in the middle;

[0038] Figure 7 A schematic structural diagram of a second buffer pad and an outer layer structure assembly provided in an embodiment of the present invention;

[0039] Figure 8 for Figure 7 The enlarged structural diagram at C in the middle;

[0040] Fig. 9 A schematic diagram of the structure of the electrical connecting sheet before bending provided by an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of the structure of an electrical connecting sheet provided in an embodiment of the present invention;

[0042] Fig.11 A schematic diagram of the structure of a connection bank group provided in an embodiment of the present invention;

[0043] Fig.12 A schematic structural diagram of a connection bank group and an external terminal combination structure provided by an embodiment of the present invention;

[0044] Fig.13 A schematic diagram of the structure of a bracket provided in an embodiment of the present invention;

[0045] Fig.14A schematic structural diagram of a combination of adjacent electrical connection sheets provided in an embodiment of the present invention.

[0046] The following are marked in the accompanying drawings:

[0047] Battery cell group 1; electric control board 2; bracket 3, external terminal 4, connection row group 5, electric connection sheet 6, lamp board 7;

[0048] Battery cell 11, tab 12, first buffer pad 13, thermal conductive sheet 14, second buffer pad 15, outer layer structure 16, buffer strip 17;

[0049] Internal connection tab 121, external connection tab 122, bending portion 123;

[0050] Board body 21, first electrical connection row 22, sawtooth structure 23, voltage signal collection pad 24;

[0051] The protruding portion 221, the base portion 222, the electrical connection portion 223, the middle connection portion 224, the suspended section 225, the pressing section 226, and the groove section 227;

[0052] The tooth portion 231 and the groove portion 232;

[0053] Heat dissipation structure 31, accommodating cavity 32, chamfer 33;

[0054] Signal connection bar 51, charging connection bar 52, first pole connection bar 53, second pole connection bar 54, polyimide film 55, embossed surface 56, internal connection terminal 57;

[0055] Internal section 541, external section 542, fuse 543;

[0056] The connecting plate portion 61 , the contraction portion 62 , and the buckling portion 63 . DETAILED DESCRIPTION

[0057] The embodiment of the present invention discloses a battery pack, which can effectively solve the problem of relatively high cost of current battery packs.

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] See also Figure 1-Figure 14 , Figure 1 A schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a battery pack provided by an embodiment of the present invention; Figure 3 A schematic diagram of an exploded structure of a battery cell group and an electric control board combination structure provided by an embodiment of the present invention; Figure 4 for Figure 3 The enlarged structural diagram at A in the middle; Figure 5 A schematic diagram of the structure of a battery cell group and an electric control board combination structure provided by an embodiment of the present invention; Figure 6 for Figure 5 The enlarged structural diagram at B in the middle; Figure 7 A schematic diagram of the structure of a second buffer pad and an outer layer structure assembly provided in an embodiment of the present invention; Figure 8 for Figure 7 The enlarged structural diagram at C in the middle; Fig. 9 A schematic diagram of the structure of the electrical connecting sheet before bending provided by an embodiment of the present invention; Fig.10 A schematic diagram of the structure of an electrical connecting sheet provided in an embodiment of the present invention; Fig.11 A schematic diagram of the structure of a connection bank group provided in an embodiment of the present invention; Fig.12 A schematic structural diagram of a connection bank group and an external terminal combination structure provided by an embodiment of the present invention; Fig.13 A schematic diagram of the structure of a bracket provided in an embodiment of the present invention; Fig.14 A schematic structural diagram of a combination of adjacent electrical connection sheets provided in an embodiment of the present invention.

[0060] In some embodiments, a battery pack is provided, mainly including a battery cell group 1, a control board, a bracket 3, etc. The bracket 3 can also be called a box body, wherein the bracket 3 is provided with a receiving cavity 32, the battery cell group 1 is placed in the receiving cavity 32, and the control board is located at the opening of the receiving cavity 32, wherein the control board is also called a BMS board (BATTERY MANAGEMENT SYSTEM, battery management system board).

[0061] In some embodiments, the battery cell group 1 may include a plurality of battery cells 11 arranged in parallel, wherein the parallel direction is generally the thickness direction of the battery cells 11 . For the convenience of description, the parallel direction is referred to as the parallel direction of the battery cells 11 .

[0062] Multiple battery cells 11 are all arranged with pole ears 12 on the electrode side of the battery cell group 1. Generally speaking, the pole ears 12 of each battery cell 11 are arranged on one side. For the convenience of description, this side is called the electrode side. Generally, an electrode is arranged on one side of the longitudinal direction of the battery cell 11, so the electrode side is parallel to the thickness direction of the battery cell 11, that is, the direction of the electrode side is perpendicular to the parallel direction of the battery cells 11. Generally, two pole ears 12 are arranged between a battery cell 11, one is a positive pole ear, and the other is a negative pole ear 12. The parallel direction of the two pole ears 12 is generally a transverse direction, and the parallel direction of the pole ears 12, the direction of the electrode side, and the parallel direction of the battery cells 11 are arranged perpendicular to each other.

[0063] Among all the pole ears 12 on the electrode side, there are mainly two parts of pole ears 12, one part of the pole ears 12 is the internal connection pole ear 121, and the other part of the pole ears 12 is the external connection pole ear 122. The two parts of the pole ears 12 are mainly different in connection relationship, and the structure can be the same or different. Generally, all the battery cells 11 are connected in series and / or in parallel to form a module, then only two external connection pole ears 122 are correspondingly provided, namely the external positive connection pole ear 12 and the external negative connection pole ear 12; and when all the battery cells 11 are divided into multiple modules, more external connection pole ears 122 are correspondingly provided at this time, such as when they are divided into two modules, four external connection pole ears 122 are provided at this time, namely two external positive connection pole ears 12 and two external negative connection pole ears 12. Generally, one module is provided with one external positive connection pole ear 12 and one external negative connection pole ear 12.

[0064] The internal connection tabs 121 of adjacent cells 11 are in electrical contact with each other to achieve electrical connection between adjacent cells 11. Among the internal connection tabs 121, one part is the internal connection positive tab, and the other part is the internal connection negative tab. Taking the parallel connection of cells 11 as an example, the internal connection positive tabs of adjacent cells 11 are in conductive contact.

[0065] Taking the battery cells 11 connected in series as a module as an example, along the parallel direction of the battery cells 11, between adjacent battery cells 11, the internally connected positive electrode ear of the previous battery cell 11 is in conductive contact with the internally connected negative electrode ear of the next battery cell 11. Among the two outermost battery cells 11 along the parallel direction of the battery cells 11, the two electrode ears 12 of one outermost battery cell 11 are respectively the internally connected positive electrode ear and the externally connected negative electrode ear, while the two electrode ears 12 of the other outermost battery cell 11 are respectively the internally connected negative electrode ear and the externally connected positive electrode ear.

[0066] Different from the internal connection tab 121, the external connection tab 122 is used to communicate with the outside, and at least one external connection tab 122 is used to connect to the first electrical connection row 22 provided on the electric control board 2. Generally, at least two first electrical connection rows 22 are provided on the electric control board 2, one of which is a first positive electrical connection row, and the other is a first negative electrical connection row. The first positive electrical connection row is electrically connected to the external positive connection tab 12, and the first negative electrical connection row is electrically connected to the external negative connection tab 12.

[0067] The electric control board 2 is located on the electrode side of the battery cell group 1 and is arranged in parallel with the electrode side, that is, along the direction of the electrode side, the electric control board 2 and the electrode side are arranged in parallel. The first electrical connection row 22 has a protruding portion 221 protruding toward the battery cell group 1, wherein the protruding portion 221 is in conductive contact with the external connection tab 122 to achieve electrical connection between the first electrical connection row 22 and the external connection tab 122. The electrical contact refers to the two contact portions being face-to-face against each other to achieve electrical connection.

[0068] The first electrical connection row 22 protrudes toward the battery cell group 1, which means protruding toward the main body of the battery cell group 1, and can also be considered as protruding toward the core part of the battery cell 11, and the protruding direction is the opposite direction of the electrode side surface direction. The protrusion 221 can be formed in the form of an L-shaped bending portion 123 or a groove-shaped bending portion 123, so it can be understood as sinking toward the battery cell 11, and can also be called a sinking structure.

[0069] In the battery pack provided in this embodiment, the first electrical connection row 22 connected to the external connection pole ear 122 no longer adopts a straight plate structure, but is provided with a protrusion 221, and protrudes toward the battery cell group 1 to connect the external connection pole ear 122, so that the external connection pole ear 122 does not need to be extended due to the height limit of the internal connection pole ear 121, and can achieve electrical contact with the corresponding first electrical connection row 22. Compared with a battery cell 11 with a longer pole ear 12 provided alone, the cost increased by extending the first electrical connection row 22 is very small. Moreover, when assembling battery cells 11 of various specifications, the assembly cost is very high because they need to be assembled in sequence, while the assembly cost of a battery cell group 1 of uniform specifications is significantly lower. Therefore, the protrusion 221 is provided to avoid the extension of the external connection pole ear 122, which can effectively achieve uniform specifications of the battery cell 11, thereby effectively reducing the difficulty of assembly and effectively reducing the assembly cost. In summary, the battery pack can effectively solve the problem of relatively high cost of current battery packs.

[0070] In some embodiments, as described above, the battery cells 11 are connected in series in sequence, wherein the external connection tabs 122 are the tabs 12 in the battery cells 11 located on the outside. Specifically, as described above, in the two outermost battery cells 11 along the parallel direction of the battery cells 11, the two tabs 12 of one outermost battery cell 11 are respectively the internally connected positive tab and the externally connected negative tab, while the two tabs 12 of the other outermost battery cell 11 are respectively the internally connected negative tab and the externally connected positive tab.

[0071] In some embodiments, the extension length of the internal connection tab 121 and the extension length of the external connection tab 122 can be made consistent along the direction away from the body of the battery cell 11. That is, when the battery cell 11 leaves the factory, the internal connection tab 121 and the external connection tab 122 have the same shape and size, so as to form a unified specification. However, during the specific connection, there may be some deviations due to different bending positions.

[0072] In some embodiments, generally speaking, the electric control board 2, i.e., the BMS board, mainly includes a board body 21, electrical components, an electrical connection row, and some connection terminals, etc. The board body 21 is a printed circuit board, connected with a plurality of electrical components with different functions. The specific circuit connection relationship of the BMS board is not described here, and the specifics can be referred to the prior art.

[0073] In some embodiments, the first electrical connection row 22 generally further includes a base portion 222, which is used to connect with the connection end of the electric control board 2 and / or the board body 21 of the electric control board 2. The base portion 222 is located on the side of the board body 21 of the electric control board 2 away from the battery group 1. The protrusion 221 includes an electrical connection portion 223 and an intermediate connection portion 224; wherein the electrical connection portion 223 is located on the side of the board body 21 of the electric control board 2 close to the battery group 1 and connected to the external connection pole ear 122; the two ends of the intermediate connection portion 224 are respectively connected with the base portion 222 and the electrical connection portion 223 in an integral molding, that is, the connection portion passes through the board body 21. It should be noted that the integral molding connection refers to an integral structure, not a welding or screw connection. Generally, the first electrical connection row 22 is an integral structure, so when forming the above structure, it can be a flat strip plate, and the above base portion 222, the intermediate connection portion 224 and the electrical connection portion 223 are formed by means such as stamping and bending.

[0074] In some embodiments, in the orientation direction of the electrode side, the contact position where two connected internal connecting pole ears 121 are in electrical contact with each other is set at the same height as the electrical connecting portion 223, that is, the electrical connecting portion 223 and the contact position where the two connected internal connecting pole ears 121 are in electrical contact with each other are set at the same height. Through the above arrangement, the electrical contact position of the internal connecting pole ear 121 is set at an elevation with the electrical contact position of the external connecting pole ear 122. In this way, on the battery cell 11 monomer, the internal connecting pole ear 121 and the external connecting pole ear 122 can be better unified in specifications, that is, the same structure is adopted. This allows that when the battery cell group 1 is assembled, according to the connection relationship, part of the pole ears 12 are internal connecting pole ears 121, and part of the pole ears 12 are external connecting pole ears 122.

[0075] In some embodiments, the external connecting ear 122 forms a bending portion 123, and the bending portion 123 of the external connecting ear 122 is superimposed on the side of the electrical connection portion 223 away from the battery cell group 1 and is in conductive contact therebetween, that is, the external connecting ear 122 needs to extend from the electrical connection portion 223 toward the side of the battery cell, away from the side of the battery cell, and bend to form the bending portion 123, so as to be superimposed on the side of the electrical connection portion 223 away from the battery cell, and then they can be connected to each other by soldering. Since the side of the electrical connection portion 223 away from the battery cell faces outward, the welding operation is convenient.

[0076] In some embodiments, for the middle fold line between the electrical connection part 223 and the intermediate connection part 224, and the fold line at the bending part 123 of the external connection ear 122: when they are parallel, the intermediate connection part 224 can be provided only on one side of the electrical connection part 223; and when they are vertical, the intermediate connection part 224 is preferably provided on both sides of the electrical connection part 223 to improve the supporting strength.

[0077] In some embodiments, there is at least one electrical connection bar, which is a copper bar, and at least one of the electrical connection bars is the first electrical connection bar 22. At least one of the connection bars includes a suspended section 225 and a pressed section 226, and the electrical connection bar may be the first electrical connection bar 22, or may not be the first electrical connection bar 22, such as the second electrical connection bar described later.

[0078] The suspended section 225 is suspended on the side of the board body 21 of the electric control board 2 away from the battery cell group 1, so that a gap is formed between the suspended section 225 and the board body 21 of the electric control board 2, and electrical components are arranged in the gap. The gap is formed by suspending the suspended section 225, so that more electrical components can be arranged on the board body 21, so that the electric control board 2 can integrate more circuit modules, reduce the area occupied by the electrical connection row on the board body 21 of the electric control board 2, or reduce the interference area.

[0079] The pressing section 226 abuts against the board body 21 of the electric control board 2, and abuts against the side of the board body 21 of the electric control board 2 away from the battery cell group 1, which can effectively avoid the deformation of the board body 21 of the electric control board 2, so as to effectively extend the service life. For some longer electrical connection rows, the pressing section 226 is generally arranged in the middle and both ends of the electrical connection row to make the distribution more uniform. At the same time, the strength of the entire electrical connection row can also be increased by the suspended section 225 and the pressing section 226. The pressing section 226 can be a plate structure or a groove structure.

[0080] In some embodiments, it is preferred that at least one of the pressing sections 226 is a slot section 227, and at least one slot section 227 is connected to a suspended section 225 at both ends of the slot width direction. The slot section 227 is arranged to avoid the appearance of a variable cross-section structure, so that the slot section 227 and the suspended section 225 are arranged with equal width. At least one slot section 227 is connected to a suspended section 225 at both ends of the slot width direction, so that the slot section 227 can be arranged in the middle to achieve better electrical connection. In addition, further, electrical components can be arranged inside some or all of the slot sections 227, that is, electrical components can be arranged in the slot of the slot section 227, especially electrical components to be electrically connected to the electrical connection row, and at this time, the electrical components are electrically connected to the bottom of the slot section 227.

[0081] In some embodiments, the battery pack generally further includes an external terminal 4, and the electric control board 2 therein is integrated with a signal module and a charging module, the external terminal 4 is electrically connected to the signal module via a signal connection row 51, and the external terminal 4 is electrically connected to the charging module via a charging connection row 52. By integrating the signal module and the charging module on the electric control board 2, there is no need to separately provide a corresponding circuit board, making the structure more compact. In addition, by providing the above-mentioned suspended section 225, more space is provided on the electric control board 2, so that the above-mentioned signal module and circuit module can be integrated.

[0082] In some embodiments, in the parallel direction of the battery cells 11, the signal connection bar 51, the charging connection bar 52, the first pole connection bar 53, and the second pole connection bar 54 can be provided on one side of the battery cell group 1, wherein one of the first pole connection bar 53 and the second pole connection bar 54 is connected to the positive output copper bar of the electric control board 2, and the other is connected to the negative output copper bar of the electric control board 2. The signal connection bar 51, the charging connection bar 52, the first pole connection bar 53, and the second pole connection bar 54 are all connected to the ports corresponding to the external terminal 4, that is, connected between the external terminal 4 and the electric control board 2. Generally, a light board 7 is provided on the other side of the battery cell group 1 as an indicator light. The signal connection bar 51, the charging connection bar 52, the first pole connection bar 53, and the second pole connection bar 54 are all connected to the ports corresponding to the external terminal 4, preferably by laser welding.

[0083] In some embodiments, in order to facilitate the installation of the fuse 543, the second pole connection row 54 may include an internal connection section 541 and an external connection section 542 that are disconnected, and a fuse 543 is provided between the internal connection section 541 and the external connection section 542. The internal connection section 541 is connected to the electric control board 2, and the external connection section 542 is used to connect to the external terminal 4.

[0084] In some embodiments, the signal connection bar 51, the charging connection bar 52, the first pole connection bar 53, and the second pole connection bar 54 are fixed by a PI film (polyimide film 55) for convenience. Specifically, the PI film can be located on the side of each connection bar close to the battery cell group 1 to achieve an insulating effect. Specifically, the signal connection bar 51, the charging connection bar 52, the first pole connection bar 53, the second pole connection bar 54, and the PI film can be combined to form a connection bar group 5.

[0085] In some embodiments, the internal connection ends 57 on the signal connection row 51, the charging connection row 52, ​​the first pole connection row 53, and the second pole connection row 54 are used for plugging with the corresponding electrical connection row on the electric control board 2. For example, plugging with the above-mentioned first electrical connection row 22. Specifically, the internal connection ends 57 on the charging connection row 52, ​​the first pole connection row 53, and the second pole connection row 54 can all form jacks to facilitate the insertion of the ends of the corresponding electrical connection rows on the electric control board 2. Further, the side surface of the internal connection end 57 can be an embossed surface 56, and the embossed surface 56 is soldered to the corresponding electrical connection row.

[0086] In some embodiments, it is preferred that the signal connection row 51 and the charging connection row 52 are located at the first pole connection row 53 and the second pole connection row 54. And the signal connection row 51, the charging connection row 52, ​​the first pole connection row 53, and the second pole connection row 54 are all bent into an L-shaped structure, so that the ports of the external terminal 4 are arranged in parallel in sequence along the electrode side direction. And it is preferred that the second pole connection row 54 is located at the outermost side to form the largest L-shaped structure, so as to facilitate the arrangement of the above-mentioned fuse 543.

[0087] In some embodiments, the battery pack generally also includes an electrical connecting plate 6, which can be understood as a voltage signal acquisition connecting plate, one end of which is connected to the internal connecting pole ear 121, and the other end is connected to the voltage signal acquisition port on the electronic control board 2. At this time, the voltage signal acquisition module is integrated on the electronic control board 2 to reduce the use of the circuit board and make the structure more compact.

[0088] In some embodiments, the electrical connection sheet 6 may include a connection plate portion 61, a contraction portion 62, and a buckle portion 63 arranged in sequence. The contraction portion 62 is a connection structure between the connection plate portion 61 and the buckle portion 63, and may also be referred to as a connection neck or a connection strip. The buckle portion 63 is used to electrically connect to the electric control board 2, and the connection plate portion 61 is used to connect to the internal connection tab 121.

[0089] In some embodiments, the edge of the electric control board 2 may be provided with a voltage signal collection pad 24 that matches the buckle portion 63, and the buckle portion 63 is arranged in parallel with the connecting plate portion 61 and is located on the side of the electric control board 2 away from the battery cell group 1. That is, a plurality of voltage signal collection pads 24 are sequentially arranged along the edge extension direction, and each voltage signal collection pad 24 is abutted against the corresponding buckle portion 63, and the buckle portion 63 and the voltage signal collection pad 24 are welded and connected to complete the electrical connection. In order to facilitate the connection, the buckle portion 63 can be made into a horn shape, and of course it can also be a general square structure.

[0090] In some embodiments, the cross section of the contraction portion 62 can be smaller than the cross section of the connecting plate portion 61 and smaller than the cross section of the buckle portion 63. When the thickness is the same, the width of the contraction portion 62 can also be smaller than the width of the connecting plate portion 61 and smaller than the width of the buckle portion 63. Through the above arrangement, the contraction portion 62 forms an easy-to-bend structure to facilitate bending at this location, such as a U-shaped structure, with the two ends of the U-shaped structure connected to the connecting plate portion 61 and the buckle portion 63 respectively.

[0091] In some embodiments, the internal connecting lugs 121 can all form a bent portion 123; the bent portions 123 of the internal connecting lugs 121 are stacked to achieve electrical contact. And the stacking direction is consistent with the direction of the electrode side. The connecting plate portion 61 is in electrical contact with the two internal connecting lugs 121 that are in conductive contact. Specifically, the connecting plate portion 61, the bent portion 123 of an internal connecting lug 121, and the bent portion 123 of another internal connecting lug 121 can be stacked in sequence along the direction of the electrode side. Generally, a buffer strip 17 is provided between the connecting plate portion 61 and the body of the battery cell 11, and foam or other buffer structures may also be used. The buffer strip 17 rides on the body of the battery cell 11 on both sides.

[0092] In some embodiments, the thickness of the electrical connection sheet 6 can be 0.12mm≤T≤0.3mm (millimeter), where "≤" in the context means less than or equal to; the width W of the contraction portion 62: 0.7mm≤W≤2.5mm. The width of the contraction portion 62 refers to the width of the contraction portion 62 along the bending line, which is perpendicular to the thickness direction and perpendicular to the parallel direction of the contraction portion 62 and the connecting plate portion 61. Specifically, the width of the contraction portion 62 can be one-fifth to one-third of the width of the connecting plate portion 61, and preferably about one-quarter of the width of the connecting plate portion 61. The electrical connection sheet 6 is preferably an integral structural member, which can be a copper sheet or a nickel sheet.

[0093] In some embodiments, a first buffer pad 13 may be provided between at least one group of adjacent battery cells 11. The first buffer pad 13 provides a buffering effect between adjacent battery cells 11. The first buffer pad 13 or other buffer pads (such as the second buffer pad 15 mentioned later) may be foam or silicone pad.

[0094] In some embodiments, the first buffer pad 13 can form a closed cavity to prevent the potting compound from entering. By setting up a closed space, the use of potting compound can be effectively reduced while providing buffering, and a good weight reduction effect can be achieved.

[0095] In some embodiments, the first buffer pad 13 is annular, such as a square frame or a circular ring. The two sides of the ring edge of the first buffer pad 13 are in sealing contact with the battery cells 11 on both sides, so that the cavity in the center of the ring of the first buffer pad 13 is a closed cavity, wherein the cavity in the center of the ring is mainly formed by the ring edge and blocked by the battery cells 11 on both sides. Specifically, it is preferred that the first buffer pad 13 has a square ring structure, that is, the outer contour and the inner contour are both square, which can also be called a round structure.

[0096] In some embodiments, it is preferred that a heat conducting sheet 14 is provided between at least one group of adjacent battery cells 11, and the adjacent heat conducting sheets 14 are in thermal contact with the battery cells 11 on both sides, so that the heat of the battery cells 11 adjacent to each other on both sides of the heat conducting sheet 14 can be conducted away by the heat conducting sheet 14. Specifically, the heat conducting sheet 14 can be a graphite sheet, a metal sheet, or other heat conducting sheets 14 with high thermal conductivity. For the convenience of installation, it is preferred that adhesive is provided on both sides of the heat conducting sheet 14 to adhere to the corresponding battery cells 11 and improve the convenience of installation.

[0097] In some embodiments, considering that the heat conducting sheet 14 can conduct heat to the battery cells 11 on both sides at the same time, the gaps between adjacent battery cells 11 can be alternately provided with first buffer pads 13 and the heat conducting sheet 14. The gaps between adjacent corresponding battery cells 11 refer to the gaps between each gap, and the gap here refers to the gaps between adjacent battery cells 11.

[0098] For example, along the parallel direction of the battery cells 11, there are the first to eighth battery cells 11, and the first thermal conductive sheet 14 is arranged between the first battery cell 11 and the second battery cell 11, the second thermal conductive sheet 14 is arranged between the third battery cell 11 and the fourth battery cell 11, the third thermal conductive sheet 14 is arranged between the fifth battery cell 11 and the sixth battery cell 11, and the fourth thermal conductive sheet 14 is arranged between the seventh battery cell 11 and the eighth battery cell 11. A first buffer pad 13 is arranged between the second battery cell 11 and the third battery cell 11, between the fourth battery cell 11 and the fifth battery cell 11, and between the sixth battery cell 11 and the seventh battery cell 11. When there are the ninth battery cell 11 and the tenth battery cell 11, the first buffer pad 13 is arranged between the eighth battery cell 11 and the ninth battery cell 11, and the fifth thermal conductive sheet 14 is arranged between the ninth battery cell 11 and the tenth battery cell 11.

[0099] In some embodiments, at least one group of two adjacent thermal conductive sheets 14 are connected on the outside of the battery cell group 1 to form a cylindrical structure. Of course, two adjacent thermal conductive sheets 14 can also be connected on the outside of the battery cell group 1 to form a cylindrical structure. As mentioned above, along the parallel direction of the pole ear 12, both sides of the first thermal conductive sheet 14 and both sides of the second thermal conductive sheet 14 are connected to form a cylindrical structure, and both sides of the third thermal conductive sheet 14 and both sides of the fourth thermal conductive sheet 14 are connected to form a cylindrical structure. That is, the depth direction of the cylindrical structure is the direction of the electrode side.

[0100] In some embodiments, adjacent heat conducting sheets 14 are connected by an intermediate heat conducting sheet 14, and the intermediate heat conducting sheet 14 is located outside the battery cell group 1 and can be in thermal contact with the heat dissipation structure 31 on the bracket 3 to directly transfer heat to the heat dissipation structure 31 on the bracket 3. At this time, one heat conducting sheet 14, one intermediate heat conducting sheet 14, another heat conducting sheet 14, and another intermediate heat conducting sheet 14 are sequentially connected end to end to form a cylindrical structure.

[0101] In some embodiments, along the parallel direction of the battery cells 11, second buffer pads 15 are provided on both sides of the battery cell group 1, and the second buffer pads 15 are located between the battery cell group 1 and the cavity wall of the accommodating cavity 32 of the bracket 3 for buffering. As mentioned above, the second buffer pad 15 can also be a foam structure.

[0102] In some embodiments, the side of the second buffer pad 15 away from the battery cell group 1 is covered with an outer layer structure 16 with a friction coefficient lower than that of the second buffer pad 15. During installation, the battery cell group 1 is generally assembled, at least the battery cell 11, the first buffer pad 13, the second buffer pad 15, the heat conductive sheet 14 and other structures are assembled to form a whole, and then the main body is placed into the accommodating cavity 32 from the opening of the accommodating cavity 32. Due to the compact structure, it is difficult to avoid the outer wall of the whole from contacting the cavity wall of the accommodating cavity 32. When the outer layer structure 16 with a smaller friction coefficient is attached to the outside of the second buffer pad 15, the outer layer structure 16 contacts the cavity wall of the accommodating cavity 32, and the resistance between them is smaller than that between the second buffer pad 15 and the cavity wall of the accommodating cavity 32. So that the whole is easy to put in. For the convenience of distinction, the first buffer pad 13 can also be called an internal buffer pad, and the second buffer pad 15 can also be called an external buffer pad. The second buffer pad 15 may also be an annular structure, with one side in sealing contact with the battery cell 11 and the other side in sealing contact with the outer layer structure 16, so that a closed cavity is formed in the middle to prevent the potting cavity from entering; of course, the second buffer pad 15 may also be a plate-type structure directly.

[0103] In some embodiments, the outer layer structure 16 can be a plastic film, or a plastic plate. Preferably, the outer layer structure 16 is a release film.

[0104] In some embodiments, the battery cell group 1 can be located in the accommodating cavity 32 of the bracket 3, and the battery cell group 1 and the accommodating cavity 32 are filled with heat-conducting potting glue. If there is also a gap between the battery cell group 1 and the intermediate thermal conductive sheet 14, the gap should also be filled with potting glue. The potting glue can fix various structures at the accommodating cavity 32, such as the first buffer pad 13, the second buffer pad 15, the electric control board 2, the battery cell 11, etc. As mentioned above, the bracket 3 can be a box structure, and the bracket 3 is open on one side, as shown in the figure, and is open at the top, and the electric control board 2 covers the opening.

[0105] The potting glue can conduct heat, and specifically, a heat-conducting medium can be added, so that not only the battery cells 11 can be heat-conducted by the potting glue, but also the heat-conducting sheet 14 and the external structure, and the battery cells 11 and the external structure can be heat-conducted through the heat-conducting sheet 14. It should be noted that generally, after the whole is placed in the accommodating cavity 32, the fluid potting glue is poured in, and the potting glue is solidified to fix the structure. The method of pouring the potting glue can also refer to the existing technology.

[0106] In some embodiments, the bracket 3 can be embedded with a heat dissipation structure 31, and one side of the heat dissipation structure 31 faces the accommodating cavity 32 to contact the potting glue, and the other side faces the outside of the bracket 3 and is provided with heat dissipation fins. The heat dissipation fin structure is not limited, and it is based on the convenience of external heat dissipation. When a heat conductive sheet 14 is provided, the heat conductive sheet 14 can be abutted against the heat dissipation structure 31. For example, if there is an intermediate heat conductive sheet 14, the intermediate heat conductive sheet 14 is abutted against the heat dissipation structure 31 to directly transfer heat out. The heat dissipation structure 31 can be, for example, a heat dissipation aluminum sheet. Generally, in the parallel direction of the battery cell 11 and the tabs 12, heat dissipation structures 31 are provided on both sides of the bracket 3.

[0107] In some embodiments, the edge of the electric control board 2 may have a sawtooth structure 23, which may also be called a wave-shaped structure or a waveform structure. The sawtooth structure 23 includes teeth 231 and grooves 232 that are alternately arranged. The teeth 231 may be a square, triangular or trapezoidal structure, which is not limited. When the teeth 231 is a square, the sawtooth structure 23 may be called a square wave structure; when the teeth 231 is a triangular structure with an arc transition, the sawtooth structure 23 may be called a sine wave structure.

[0108] In some embodiments, each tooth portion 231 of the sawtooth structure 23 may be provided with a voltage signal collection pad 24, preferably one voltage signal collection pad 24, to connect with the electrical connection sheet 6. Preferably, they are arranged one by one, that is, the extended tooth portion 231 correspondingly carries each voltage signal collection pad 24. Specifically, in the parallel direction of the tabs 12 of the battery cell 11, the edge portions of both sides of the electric control board 2 may be in a sawtooth structure 23, so as to correspond to the electrical connection sheets 6 on both sides.

[0109] The groove portion 232 of the sawtooth structure 23 is aligned with the gap between the cavity wall of the accommodating cavity 32 and the battery cell group 1, so that each groove portion 232 serves as a glue injection port, and the injected glue directly enters the gap. Since the voltage signal acquisition pad 24 is located between the two battery cells 11, and is staggered along the parallel direction of the tabs 12 of the battery cells 11, at this time, on one side of the electric control board 2, the distance between the centers of adjacent tooth portions 231 is exactly the distance between the centers of the two battery cells 11. Therefore, the groove portion 232 is provided here, which makes it more convenient to inject glue into the recessed portion between adjacent battery cells 11, which makes the gap between the battery cell group 1 and the cavity wall of the accommodating cavity 32 smaller, and at this time, the distance between the edge of the battery cell 11 and the cavity wall of the accommodating cavity 32 can only be used for exhaust, or a small amount of glue conduction. Furthermore, through the above arrangement, the size of the entire battery pack can be made smaller.

[0110] In some embodiments, preferably in the electrode side direction, the corresponding side wall of the accommodating cavity 32 forms an opening of a size matching the battery cell group 1 as a take-in and put-out opening, and a chamfer 33 can be formed at the edge of the opening, preferably a round chamfer 33, of course, a straight chamfer 33 can also be used.

[0111] In some embodiments, in the parallel direction of the tabs 12 of the battery cells 11, the gap between the battery cell group 1 and the wall of the accommodating cavity 32 can be between 0 mm and 2 mm, that is, the gap L between the battery cell group 1 and the wall of the accommodating cavity 32: L≤2 mm.

[0112] Of course, in the parallel direction of the battery cells 11 , the gap L between the battery cell group 1 and the wall of the accommodating cavity 32 can be set to L≤2 mm.

[0113] Since the side surface of the battery cell group 1 is not a complete side surface, the outermost position should be constructed as a plane, and the distance between the plane and the cavity wall of the accommodating cavity 32 is calculated.

[0114] In some embodiments, the hardness H of the cured potting glue can be set to: Shore A 35 degrees ≤ H ≤ Shore A 85 degrees.

[0115] In some embodiments, the battery cell 11 may be a soft-pack battery cell 11 , or may be other sheet-shaped or plate-shaped battery cells 11 .

[0116] In some embodiments, to facilitate understanding of the structure, the parallel direction of the battery cells 11 can be the first direction, namely the X direction; the parallel direction of the battery cell 11 and the tabs 12 can be the second direction, namely the Y direction; and the electrode side direction can be the third direction, namely the Z direction.

[0117] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0118] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that: include: A battery cell group (1) comprises a plurality of battery cells (11) arranged in parallel, wherein each of the plurality of battery cells (11) is provided with a pole lug (12) on an electrode side of the battery cell group (1); on the electrode side, among the pole lugs (12): a portion of the pole lugs (12) are internal connection pole lugs (121), and another portion of the pole lugs (12) are external connection pole lugs (122); and the internal connection pole lugs (121) of adjacent battery cells (11) are in electrical contact with each other; An electric control board (2) is located on the electrode side of the battery cell group (1), the electric control board (2) having a first electrical connection row (22), the first electrical connection row (22) having a protruding portion (221) protruding toward the battery cell group (1), the protruding portion (221) being in conductive contact with the external connection tab (122).

2. The battery pack according to claim 1, characterized in that: The external connection pole lug (122) is the pole lug located in the outer battery cell (11); along a direction away from the battery cell (11) body, the extended length of the internal connection pole lug (121) is consistent with the extended length of the external connection pole lug (122).

3. The battery pack according to claim 1, characterized in that: The first electrical connection row (22) further comprises a base portion (222), the base portion (222) being located on a side of the plate body (21) of the electrical control board (2) away from the battery cell group (1), the protruding portion (221) comprising an electrical connection portion (223) and an intermediate connection portion (224); the electrical connection portion (223) being located on a side of the plate body (21) of the electrical control board (2) close to the battery cell group (1) and connected to the external connection lug (122); and the intermediate connection portion (224) having two ends respectively being integrally formed and connected to the base portion (222) and the electrical connection portion (223).

4. The battery pack according to claim 3, characterized in that: In the orientation direction of the electrode side, the contact position where the two connected internal connection tabs (121) are in electrical contact with each other is arranged at the same height as the electrical connection portion (223); the bent portion (123) of the external connection tab (122) is overlapped on the side of the electrical connection portion (223) away from the core body of the battery cell group (1) and is in conductive contact with each other.

5. The battery pack according to claim 1, characterized in that: At least one electrical connection row is provided, at least one of the electrical connection rows is a first electrical connection row (22), and at least one of the electrical connection rows comprises a suspended section (225) and a pressed-down section (226); the suspended section (225) is suspended on a side of the electric control board (2) body (21) away from the battery cell group (1), electrical components are arranged in a gap between the suspended section (225) and the electric control board (2) body, and the pressed-down section (226) is in contact with the electric control board body.

6. The battery pack according to claim 5, characterized in that: At least one of the pressing-down sections (226) is a slot-shaped section (227), and both ends of at least one of the slot-shaped sections (227) are respectively connected to the suspended sections (225); at least one of the slot-shaped sections (227) has electrical components arranged inside; and the electrical connection bar is a copper bar.

7. The battery pack according to claim 1, characterized in that: It comprises an external terminal (4), a signal module and a charging module are integrated on the electric control board (2), the external terminal (4) is electrically connected to the signal module via a signal connection row (51), and the external terminal (4) is electrically connected to the charging module via a charging connection row (52).

8. The battery pack according to claim 7, characterized in that: In the parallel direction of the battery cells, one side of the battery cell group is provided with the signal connection bar (51), the charging connection bar (52), the first pole connection bar (53), and the second pole connection bar (54); one of the first pole connection bar (53) and the second pole connection bar (54) is connected to the positive pole output copper bar of the electric control board (2), and the other is connected to the negative pole output copper bar of the electric control board (2); the signal connection bar (51), the charging connection bar (52), the first pole connection bar (53), and the second pole connection bar (54) are all connected to ports corresponding to the external terminals (4).

9. The battery pack according to claim 8, characterized in that: The signal connection bar (51), the charging connection bar (52), the first pole connection bar (53), and the second pole connection bar (54) are fixed by a polyimide film (55); the second pole connection bar (54) comprises an internal connection section (541) and an external connection section (542) which are disconnected, and a fuse (543) is provided between the internal connection section (541) and the external connection section (542).

10. The battery pack according to claim 8, characterized in that: The internal connection ends (57) on the signal connection bar (51), the charging connection bar (52), the first pole connection bar (53), and the second pole connection bar (54) are plugged into corresponding electrical connection bars on the electric control board (2), and the side surfaces of the internal connection ends (57) are embossed surfaces (56), and the embossed surfaces (56) are solder-connected to the corresponding electrical connection bars on the electric control board (2).

11. The battery pack according to claim 1, characterized in that: The invention also comprises an electrical connection sheet (6), the electrical connection sheet (6) comprising a connection plate portion (61), a contraction portion (62) and a buckle portion (63) arranged in sequence; a voltage signal acquisition pad (24) matching with the buckle portion is provided at the edge of the electric control board (2); the buckle portion (63) is arranged in parallel with the connection plate portion (61) and is located on a side of the electric control board (2) away from the battery cell group (1); the cross section of the contraction portion (62) is smaller than the cross section of the connection plate portion (61) and smaller than the cross section of the buckle portion (63); the internal connection lugs (121) all form a bent portion (123); the connection plate portion (61) is in electrical contact with two internal connection lugs (121) in conductive contact with each other; and along the electrode side direction, the connection plate portion (61), the bent portion of one internal connection lug (121) and the bent portion of another internal connection lug (121) are stacked in sequence.

12. The battery pack according to claim 11, characterized in that: The thickness T of the electrical connection sheet (6) is 0.12 mm ≤ T ≤ 0.3 mm; the width W of the contraction portion along the bending line is 0.7 mm ≤ W ≤ 2.5 mm; and the electrical connection sheet is a nickel sheet.

13. The battery pack according to claim 1, characterized in that: A first buffer pad (13) is provided between at least one group of adjacent battery cells (11), and the first buffer pad (13) forms a closed cavity; the first buffer pad (13) is ring-shaped, the ring edge of the first buffer pad (13) is in sealing contact with the battery cells (11) on both sides, and the cavity at the center of the ring of the first buffer pad (13) is the closed cavity.

14. The battery pack according to claim 13, characterized in that: A heat conducting sheet (14) is provided between at least one group of adjacent battery cells (11), and the heat conducting sheet (14) is in thermal contact with the battery cells (11) on both sides; the first buffer pads (13) and the heat conducting sheets (14) are alternately provided in the gaps between the adjacent battery cells (11); and at least one group of two adjacent heat conducting sheets (14) are connected on the outside of the battery cell group (1) to form a cylindrical structure.

15. The battery pack according to claim 1, characterized in that: Along the parallel direction of the battery cells (11), second buffer pads (15) are provided on both sides of the battery cell group (1), and a side of the second buffer pad (15) away from the battery cell group (1) is covered with an outer layer structure (16) having a friction coefficient lower than that of the second buffer pad (15).

16. The battery pack according to claim 15, characterized in that: The outer layer structure (16) is a release film.

17. The battery pack according to any one of claims 1 to 11, characterized in that: The invention also comprises a bracket (3), the bracket (3) being provided with a receiving cavity (32), the battery cell group (1) being located in the receiving cavity (32), a heat-conducting potting glue being filled between the battery cell group (1) and the receiving cavity (32), a heat dissipation structure (31) being embedded in the bracket (3), the heat dissipation structure (31) having one side facing the receiving cavity (32) so as to contact the potting glue, and the other side facing the outside of the bracket (3) and being provided with heat dissipation fins.

18. The battery pack according to claim 17, characterized in that: The edge of the electric control board (2) has a sawtooth structure (23), each tooth portion (231) of the sawtooth structure (23) is respectively provided with a voltage signal collection pad (24), and the voltage signal collection pad (24) is connected to the electrical connection sheet (6).

19. The battery pack according to claim 18, characterized in that: In the direction of the electrode side, the corresponding side wall of the accommodating cavity (32) forms an opening whose size matches that of the battery cell group (1), and a chamfer (33) is formed along the edge of the opening.

20. The battery pack according to claim 18, characterized in that: In the parallel direction of the tabs (12) of the battery cells (11), the gap L between the battery cell group (1) and the cavity wall of the accommodating cavity (32) is: L≤2mm; the hardness H of the potting glue is: Shore A35 degrees≤H≤Shore A85 degrees.

21. An electrical device, comprising a housing, characterized in that: It also includes a battery pack as described in any one of claims 1-20; the battery pack is located in the shell.

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