Battery pack and electric device

Abstract

The utility model 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 of 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 utility model also discloses an electric device comprising the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a battery pack, and also to an electric device including the above battery pack. Background Art

[0002] Due to its excellent high-rate discharge characteristics, low heat generation, high safety, light weight and other characteristics, soft-pack battery cells are increasingly used in products such as power tools, vacuum cleaners, floor washers, and drones. The working conditions and application scenarios of garden tool batteries and power tool batteries are complex, and high mechanical reliability is required. How to improve the space utilization rate of soft-pack batteries, increase the capacity, reduce the weight while taking into account mechanical safety has become a problem to be solved.

[0003] In current battery packs, due to different connection objects of the battery tabs, it is often necessary to prepare two or even more specifications of battery cells, which results in very high costs, including not only manufacturing costs but also assembly costs.

[0004] In summary, how to effectively solve the problem of relatively high costs of current battery packs is an urgent problem for those skilled in the art at present. Summary of the Utility Model

[0005] In view of this, the first object of the utility model is to provide a battery pack, which can effectively solve the problem of relatively high costs of current battery packs. The second object of the utility model is to provide an electric device including the above battery pack.

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

[0007] A battery pack, comprising:

[0008] A battery cell group, including a plurality of battery cells arranged in parallel, and a tab is arranged on the electrode side of each of the plurality of battery cells; on the electrode side, among the tabs: a part of the tabs are internal connection tabs, and another part of the tabs are external connection tabs; the internal connection tabs between adjacent battery cells are in electrical contact with each other.

[0009] An electronic control board, located on the electrode side of the battery cell group, and a first electrical connection row is provided on the electronic control board, and the first electrical connection row has a protruding portion protruding towards the battery cell group, and the protruding portion is in conductive contact with the external connection tab.

[0010] In the above battery pack, for the first electrical connection row connecting the external connection tabs, instead of using a straight plate structure, a protruding portion is provided and protrudes towards the battery cell group to connect the external connection tabs, so that the external connection tabs can be in electrical contact with the corresponding first electrical connection row without the need to be extended due to the height limitation of the internal connection tabs. Compared with a battery cell having a longer tab provided separately, the cost increase due to the extension of the first electrical connection row is very small. Moreover, when assembling various specifications of battery cells, the assembly cost is very high because they need to be assembled in sequence, while the assembly cost of battery cells of the same specification is significantly lower. Therefore, by providing the protruding portion to avoid the extension of the external connection tabs, battery cells of the same specification can be effectively realized, so that the assembly difficulty can be effectively reduced and the assembly cost can be effectively reduced. In summary, the battery pack can effectively solve the problem of relatively high cost of the current battery pack.

[0011] In some technical solutions, the external connection tab is the tab in the outermost battery cell; along the direction away from the battery cell body, the extension lengths of the internal connection tab and the external connection tab are the same.

[0012] In some technical solutions, the first electrical connection row further includes a base portion, the base portion is located on the side of the plate body of the electronic control board away from the battery cell group, and the protruding portion includes an electrical connection portion and an intermediate connection portion; the electrical connection portion is located on the side of the plate body of the electronic control board close to the battery cell group and connects the external connection tab; both ends of the intermediate connection portion are integrally formed and connected to the base portion and the electrical connection portion respectively.

[0013] In some technical solutions, in the direction of the orientation of the electrode side, the contact position where two adjacent internal connection tabs are in electrical contact with each other is set at the same height as the electrical connection portion; the bent portion of the external connection tab is stacked on the side of the electrical connection portion away from the core body of the battery cell group and is in conductive contact therebetween.

[0014] In some technical solutions, there is at least one electrical connection row, at least one of the electrical connection rows is the first electrical connection row, and at least one of the electrical connection rows includes a suspended section and a pressing section; the suspended section is suspended on the side of the plate body of the electronic control board away from the battery cell group, and electrical components are arranged in the gap between the suspended section and the plate body of the electronic control board, and the pressing section is in contact with the plate body of the electronic control board.

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

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

[0017] In some technical solutions, in the direction of the juxtaposition of the battery cells, on one side of the battery cell group, there are provided the signal connection row, the charging connection row, the first pole connection row, and the second pole connection row. One of the first pole connection row and the second pole connection row is connected to the positive output copper row of the electronic control board, and the other is connected to the negative output copper row of the electronic control board; the signal connection row, the charging connection row, the first pole connection row, and the second pole connection row are all connected to the corresponding ports of the external terminal.

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

[0019] In some technical solutions, the inner connection ends on the signal connection row, the charging connection row, the first pole connection row, and the second pole connection row are inserted into the corresponding electrical connection rows on the electronic control board, and the side surface of the inner connection end is an embossed surface, and the embossed surface is soldered to the corresponding electrical connection row of the electronic control board.

[0020] In some technical solutions, an electrical connection piece is further included. The electrical connection piece includes a connecting plate portion, a shrinking portion, and a fastening portion arranged in sequence. At the edge of the electronic control board, there is a voltage signal acquisition solder pad that fits with the fastening portion; the fastening portion is arranged parallel to the connecting plate portion and is located on the side of the electronic control board away from the battery cell group; the cross-section of the shrinking portion is smaller than the cross-section of the connecting plate portion and smaller than the cross-section of the fastening portion; the internal connection pole ears all form bending portions; the connecting plate portion is in electrical contact with two of the internal connection pole ears that are in conductive contact; along the direction of the electrode side, the connecting plate portion, the bending portion of one of the internal connection pole ears, and the bending portion of the other internal connection pole ear are stacked in sequence.

[0021] In some technical solutions, the thickness T of the electrical connection piece satisfies 0.12 mm ≤ T ≤ 0.3 mm; the width W of the shrinking portion in the direction of the bending line satisfies 0.7 mm ≤ W ≤ 2.5 mm; the electrical connection piece is a nickel sheet.

[0022] In some technical solutions, at least one set of adjacent battery cells is provided with a first buffer pad, and the first buffer pad forms a closed cavity; the first buffer pad is annular, the annular edge of the first buffer pad is in sealed contact with the two adjacent battery cells on both sides, and the cavity at the center of the ring of the first buffer pad is the closed cavity.

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

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

[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 receiving cavity, the battery cell group is located in the receiving cavity, a heat conducting potting glue is filled between the battery cell group and the receiving cavity, a heat dissipation structure is embedded in the bracket, one side of the heat dissipation structure faces the receiving 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 electronic control board has a serrated structure, and each tooth of the serrated structure is respectively provided with a voltage signal acquisition pad, and the voltage signal acquisition pad is connected to an electrical connection piece.

[0028] In some technical solutions, on the direction of the electrode side facing, an opening matching the size of the battery cell group is formed on the corresponding side wall of the receiving cavity, and a chamfer is formed at the edge of the opening.

[0029] In some technical solutions, in the direction in which the battery cell tabs are arranged in parallel, the gap L between the battery cell group and the wall of the receiving cavity: L ≤ 2 mm; the hardness H of the potting glue: Shore A 35 degrees ≤ H ≤ Shore A 85 degrees.

[0030] In order to achieve the second above-mentioned purpose, the present invention further provides an electrical device. The electrical device includes any one of the above battery packs and includes a housing, and the battery pack is located in the housing. Since the above battery pack has the above technical effects, the electrical device having the battery pack should also have corresponding technical effects. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 Explosion structure schematic diagram of the battery pack provided by the embodiment of the present invention;

[0033] Figure 2 Structure schematic diagram of the battery pack provided by the embodiment of the present invention;

[0034] Figure 3 Explosion structure schematic diagram of the combined structure of the battery cell group and the electronic control board provided by the embodiment of the present invention;

[0035] Figure 4 For Figure 3 Enlarged structure schematic diagram at position A in

[0036] Figure 5 Structure schematic diagram of the combined structure of the battery cell group and the electronic control board provided by the embodiment of the present invention;

[0037] Figure 6 For Figure 5 Enlarged structure schematic diagram at position B in

[0038] Figure 7 Structure schematic diagram of the second buffer pad and the outer layer structure assembly provided by the embodiment of the present invention;

[0039] Figure 8 For Figure 7 Enlarged structure schematic diagram at position C in

[0040] Figure 9 Structure schematic diagram of the pre-bent electrical connection piece provided by the embodiment of the present invention;

[0041] Figure 10 Structure schematic diagram of the electrical connection piece provided by the embodiment of the present invention;

[0042] Figure 11 Structure schematic diagram of the connection row group provided by the embodiment of the present invention;

[0043] Figure 12 Structure schematic diagram of the combined structure of the connection row group and the external terminal provided by the embodiment of the present invention;

[0044] Figure 13 Structure schematic diagram of the bracket provided by the embodiment of the present invention;

[0045] Figure 14 Schematic structural diagram of an adjacent electrical connection piece combination provided by an embodiment of the present utility model.

[0046] The markings in the accompanying drawings are as follows:

[0047] Cell group 1; electronic control board 2; bracket 3, external terminal 4, connection row group 5, electrical connection piece 6, lamp board 7;

[0048] Cell 11, tab 12, first buffer pad 13, heat conducting sheet 14, second buffer pad 15, outer structure 16, buffer strip 17;

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

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

[0051] Protruding part 221, base part 222, electrical connection part 223, intermediate connection part 224, suspended section 225, pressing section 226, groove section 227;

[0052] Tooth part 231, groove part 232;

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

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

[0055] Inner connection section 541, outer connection section 542, fuse 543;

[0056] Connection board part 61, contraction part 62, fastening part 63. Detailed implementation manners

[0057] An embodiment of the present utility model discloses a battery pack, which can effectively solve the problem of relatively high cost of the current battery pack.

[0058] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0059] Please refer to Figures 1 - 14 , Figure 1 which is an exploded structural diagram of the battery pack provided by an embodiment of the present utility model; Figure 2Schematic diagram of the structure of the battery pack provided by the embodiment of the present utility model; Figure 3 Exploded schematic diagram of the combined structure of the battery cell group and the electronic control board provided by the embodiment of the present utility model; Figure 4 For Figure 3 Enlarged schematic diagram at position A in Figure 5 Schematic diagram of the combined structure of the battery cell group and the electronic control board provided by the embodiment of the present utility model; Figure 6 For Figure 5 Enlarged schematic diagram at position B in Figure 7 Schematic diagram of the structure of the second buffer pad and the outer layer structure assembly provided by the embodiment of the present utility model; Figure 8 For Figure 7 Enlarged schematic diagram at position C in Figure 9 Schematic diagram of the structure of the pre-bent electrical connection piece provided by the embodiment of the present utility model; Figure 10 Schematic diagram of the structure of the electrical connection piece provided by the embodiment of the present utility model; Figure 11 Schematic diagram of the structure of the connection row group provided by the embodiment of the present utility model; Figure 12 Schematic diagram of the combined structure of the connection row group and the external terminal provided by the embodiment of the present utility model; Figure 13 Schematic diagram of the structure of the bracket provided by the embodiment of the present utility model; Figure 14 Schematic diagram of the structure of the combined adjacent electrical connection pieces provided by the embodiment of the present utility model.

[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, and 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. The control board is also called a BMS board (BATTERY MANAGEMENT SYSTEM board).

[0061] In some embodiments, the battery cell group 1 can include a plurality of battery cells 11 arranged in parallel. The parallel direction is generally the thickness direction of the battery cell 11. For the convenience of description, the parallel direction here is called the parallel direction of the battery cell 11.

[0062] A plurality of battery cells 11 are all provided with tabs 12 on the electrode side of the battery cell group 1. Generally, the tabs 12 of each battery cell 11 are all arranged on one side. For the convenience of description, this side is called the electrode side. Generally, an electrode is provided on one side in the longitudinal direction of the battery cell 11. Therefore, the electrode side is parallel to the thickness direction of the battery cell 11, that is, the orientation direction of the electrode side is perpendicular to the parallel direction of the battery cell 11. Generally, two tabs 12 are provided between one battery cell 11, one is a positive tab, and the other is a negative tab 12. The parallel direction of the two tabs 12 is generally the horizontal direction, and the parallel direction of the tabs 12, the orientation direction of the electrode side, and the parallel direction of the battery cell 11 are perpendicular to each other pairwise.

[0063] Among all the tabs 12 on the electrode side, the tabs 12 are mainly divided into two parts. One part of the tabs 12 is the internal connection tabs 121, and the other part of the tabs 12 is the external connection tabs 122. The main difference between these two parts of the tabs 12 lies in the connection relationship, and their structures 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, there are only two external connection tabs 122, namely the external positive connection tab 12 and the external negative connection tab 12. When all the battery cells 11 are divided into multiple modules, more external connection tabs 122 are correspondingly set. For example, when divided into two modules, there are four external connection tabs 122 at this time, that is, two external positive connection tabs 12 and two external negative connection tabs 12. Generally, one module is provided with one external positive connection tab 12 and one external negative connection tab 12.

[0064] The internal connection tabs 121 of adjacent battery cells 11 are in electrical contact with each other to achieve the electrical connection between adjacent battery 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 the battery cells 11 as an example, the internal connection positive tabs of adjacent battery cells 11 are in conductive contact.

[0065] Taking the series connection of the battery cells 11 as a module as an example, along the parallel direction of the battery cells 11, between adjacent battery cells 11, the internal connection positive tab of the previous battery cell 11 is in conductive contact with the internal connection negative tab of the next battery cell 11. Among 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 internal connection positive tab and the external connection negative tab, while the two tabs 12 of the other outermost battery cell 11 are respectively the internal connection negative tab and the external connection positive tab.

[0066] Different from the internal connection tabs 121, the external connection tabs 122 are used for external connection, and at least one external connection tab 122 is used to connect with the first electrical connection row 22 provided on the electronic control board 2. Generally, at least two first electrical connection rows 22 are provided on the electronic control board 2. One of them is the first positive electrical connection row, and the other is the 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] Among them, the electronic 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 orientation direction of the electrode side, the electronic control board 2 and the electrode side are arranged in parallel. And the first electrical connection row 22 has a protruding portion 221 protruding towards the battery cell group 1. 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 means that two contact surfaces are in contact with each other to achieve electrical connection.

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

[0069] In the battery pack provided in this embodiment, for the first electrical connection row 22 connecting the external connection tab 122, a straight plate structure is no longer adopted, but a protruding part 221 is provided and protrudes towards the battery cell group 1 to connect the external connection tab 122, so that the external connection tab 122 can be in electrical contact with the corresponding first electrical connection row 22 without the need to be extended due to the height limitation of the internal connection tab 121. Compared with a battery cell 11 with a relatively long tab 12 provided separately, the cost increase due to the extension of the first electrical connection row 22 is very small. Moreover, when assembling various specifications of battery cells 11, since they need to be assembled in sequence, the assembly cost is very high, while the assembly cost of a battery cell group 1 with a unified specification is significantly lower. Therefore, by providing the protruding part 221 and avoiding the extension of the external connection tab 122, battery cells 11 with a unified specification can be effectively realized, so that the assembly difficulty can be effectively reduced and the assembly cost can be effectively reduced. In summary, this battery pack can effectively solve the problem of relatively high cost of the current battery pack.

[0070] In some embodiments, as described above, each battery cell 11 is connected in series in sequence, and the external connection tab 122 is the tab 12 in the outermost battery cell 11. Specifically, as described above, among the two outermost battery cells 11 along the juxtaposed direction of the battery cells 11, the two tabs 12 of one outermost battery cell 11 are respectively an internal connection positive tab and an external connection negative tab, while the two tabs 12 of the other outermost battery cell 11 are respectively an internal connection negative tab and an external connection positive tab.

[0071] In some embodiments, along the direction away from the body of the battery cell 11, the extension lengths of the internal connection tab 121 and the external connection tab 122 can be made the same. 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 to form a unified specification. However, during specific connection, due to different bending positions, there may be some deviations.

[0072] In some embodiments, generally speaking, the electronic control board 2, that is, the BMS board, mainly includes a board body 21, electrical components, electrical connection rows, and some connection ends, etc. The board body 21 is a printed circuit board and is connected with a plurality of electrical components with different functions. The specific circuit connection relationship of the BMS board will not be elaborated here, and reference can be made to the existing technology for details.

[0073] In some embodiments, generally, the first electrical connection row 22 further includes a base portion 222, and the base portion 222 is used to connect with the connection end of the electronic control board 2 and / or the board body 21 of the electronic control board 2. The base portion 222 is located on the side of the board body 21 of the electronic control board 2 away from the battery cell group 1. And the protruding portion 221 includes an electrical connection portion 223 and an intermediate connection portion 224; the electrical connection portion 223 is located on the side of the board body 21 of the electronic control board 2 close to the battery cell group 1 and is connected to the external connection tab 122; both ends of the intermediate connection portion 224 are integrally formed and connected to the base portion 222 and the electrical connection portion 223 respectively, that is, the connection portion passes through the board body 21. It should be noted that the integrally formed connection refers to an integral structure, rather than welding or screw connection. Generally, the first electrical connection row 22 is an integral structure. Therefore, when forming the above structure, it can be on a flat strip board, and by means of stamping and bending, etc., to form the above-mentioned base portion 222, intermediate connection portion 224 and electrical connection portion 223.

[0074] In some embodiments, in the direction of the electrode side, the contact position where two adjacent internal connection tabs 121 are in electrical contact with each other is set at the same height as the electrical connection portion 223, that is, the electrical connection portion 223 is set at the same height as the contact position where two adjacent internal connection tabs 121 are in electrical contact with each other. Through the above setting, the electrical contact position of the internal connection tab 121 is set at the same height as the electrical contact position of the external connection tab 122. In this way, on the single battery cell 11, the internal connection tab 121 and the external connection tab 122 can have a better unified specification, that is, adopt the same structure. This enables, when assembling the battery cell group 1, according to the connection relationship, some of the tabs 12 are internal connection tabs 121 and some of the tabs 12 are external connection tabs 122.

[0075] In some embodiments, the external connection tab 122 forms a bent portion 123, and the bent portion 123 of the external connection tab 122 is stacked 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 therebetween. That is, the external connection tab 122 needs to extend from the side of the electrical connection portion 223 facing the battery cell to the side of the electrical connection portion 223 away from the battery cell and be bent to form the bent portion 123 to be stacked on the side of the electrical connection portion 223 away from the battery cell, and then they can be soldered to each other. Since the side of the electrical connection portion 223 away from the battery cell faces the outside, the soldering operation is convenient.

[0076] In some embodiments, for the intermediate fold line between the electrical connection portion 223 and the intermediate connection portion 224 and the fold line at the bent portion 123 of the external connection tab 122: when they are parallel, the intermediate connection portion 224 can be provided only on one side of the electrical connection portion 223; when they are perpendicular, it is preferably provided with intermediate connection portions 224 on both sides of the electrical connection portion 223 to improve the support strength.

[0077] In some embodiments, there is at least one electrical connection row, and the electrical connection row is a copper row, wherein at least one electrical connection row is the first electrical connection row 22 described above. At least one connection row includes a suspended section 225 and a pressing section 226. This electrical connection row may be the first electrical connection row 22 or may not be the first electrical connection row 22, such as the second electrical connection row that will appear later.

[0078] The suspended section 225 is suspended on the side of the board body 21 of the electronic 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 electronic control board 2, and electrical components are arranged in the gap therebetween. By suspending the suspended section 225 to form a gap, more electrical components can be arranged on the board body 21, which is convenient for the electronic control board 2 to integrate more circuit modules, reducing the occupied area of the electrical connection row on the board body 21 of the electronic control board 2 or reducing the interference area.

[0079] The pressing section 226 is in contact with the board body 21 of the electronic control board 2 and is in contact with the board body 21 of the electronic control board 2 on the side away from the battery cell group 1, which can effectively prevent the board body 21 of the electronic control board 2 from deforming and can effectively extend the service life. For some relatively long electrical connection rows, the pressing section 226 is generally arranged at the middle position and both ends of the electrical connection row to make the distribution more uniform. At the same time, through the suspended section 225 and the pressing section 226, the strength of the entire electrical connection row can also be increased. The pressing section 226 can be a plate structure or a groove structure.

[0080] In some embodiments, it is preferably that at least one pressing section 226 is a groove section 227 here, and the two ends in the groove width direction of at least one groove section 227 are respectively connected to the suspended section 225. By providing the groove section 227, the occurrence of a variable cross-section structure is avoided, so that the groove section 227 and the suspended section 225 are of the same width. The two ends in the groove width direction of at least one groove section 227 are respectively connected to the suspended section 225, which can have a groove section 227 arranged in the middle to achieve better electrical connection. In addition, further, electrical components can be arranged inside some or all of the groove sections 227, that is, electrical components are arranged in the grooves of the groove section 227, especially the electrical components to be electrically connected to the electrical connection row. At this time, the electrical component is electrically connected to the bottom of the groove section 227.

[0081] In some embodiments, the battery pack generally further includes an external terminal 4. A signal module and a charging module are integrated on the electronic control board 2. The external terminal 4 is electrically connected to the signal module through a signal connection row 51, and the external terminal 4 is electrically connected to the charging module through a charging connection row 52. By integrating the signal module and the charging module on the electronic control board 2 without separately providing a corresponding circuit board, the structure is made more compact. In addition, through the setting of the above-mentioned suspended section 225, more space is provided on the electronic control board 2, so that the above-mentioned signal module and circuit module can be integrated.

[0082] In some embodiments, in the direction of juxtaposition of the battery cells 11, on one side of the battery cell group 1, the above-mentioned signal connection row 51, the above-mentioned charging connection row 52, the first pole connection row 53, and the second pole connection row 54 may be provided. One of the first pole connection row 53 and the second pole connection row 54 is connected to the positive output copper row of the electronic control board 2, and the other is connected to the negative output copper row of the electronic control board 2. 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 connected to the corresponding ports of the external terminal 4, that is, they are connected between the external terminal 4 and the electronic control board 2. Generally, a lamp board 7 is provided on the other side of the battery cell group 1 as an indicator light. Among them, 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 connected to the corresponding ports of the external terminal 4, and laser welding is preferably used.

[0083] In some embodiments, in order to facilitate the setting 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. 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 electronic control board 2, and the external connection section 542 is used to connect to the external terminal 4.

[0084] In some embodiments, in order to facilitate the fixing of the signal connection row 51, the charging connection row 52, the first pole connection row 53, and the second pole connection row 54 through a PI film (polyimide film 55). Specifically, the PI film may be located on the side of each connection row close to the battery cell group 1 to achieve an insulating effect. Specifically, the signal connection row 51, the charging connection row 52, the first pole connection row 53, the second pole connection row 54, and the PI film may be combined to form a connection row group 5.

[0085] In some embodiments, the inner 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 into the corresponding connection rows on the electronic control board 2. For example, plugging into the first connection row 22 as described above. Specifically, the inner 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 connection rows on the electronic control board 2. Further, the side surface of the inner connection end 57 can be an embossed surface 56, and the embossed surface 56 is soldered to the corresponding connection row.

[0086] In some embodiments, preferably here, the signal connection row 51 and the charging connection row 52 are located on 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 respective ports of the external terminal 4 are arranged side by side in the electrode side facing direction. And preferably the second pole connection row 54 is located on the outermost side to form the largest L-shaped structure to facilitate the setting of the fuse 543 as described above.

[0087] In some embodiments, the battery pack generally further includes an electrical connection piece 6, which can be understood as a voltage signal acquisition connection piece, with one end connected to the internal connection tab 121 and the other end 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 circuit boards and make the structure more compact.

[0088] In some embodiments, specifically, the electrical connection piece 6 can include a connecting plate portion 61, a shrinking portion 62, and a fastening portion 63 arranged in sequence. The shrinking portion 62 is a connection structure between the connecting plate portion 61 and the fastening portion 63, and can also be called a connection neck or a connection strip. The fastening portion 63 is used for electrical connection with the electronic control board 2, and the connecting plate portion 61 is used for connection with the internal connection tab 121.

[0089] In some embodiments, the edge of the electronic control board 2 can have voltage signal acquisition pads 24 that fit with the fastening portion 63. The fastening portion 63 is arranged parallel to the connecting plate portion 61 and is located on the side of the electronic control board 2 away from the battery cell group 1. That is, a plurality of voltage signal acquisition pads 24 are sequentially arranged along the edge extension direction at the edge portion, and each voltage signal acquisition pad 24 abuts against the corresponding fastening portion 63. The fastening portion 63 and the voltage signal acquisition pad 24 are welded to complete the electrical connection. To facilitate the connection, the fastening portion 63 can be in a sheep's horn shape, and of course, it can also be a general square structure.

[0090] In some embodiments, the cross-section of the contraction part 62 can be made smaller than that of the connection plate part 61 and smaller than the cross-section of the fastening part 63. When the thickness is the same, it can also be that the width of the contraction part 62 is smaller than the width of the connection plate part 61 and smaller than the width of the fastening part 63. Through the above arrangement, the contraction part 62 forms an easily bendable structure to facilitate bending here, such as bending into a U-shaped structure, and both ends of the U-shaped structure are respectively connected to the connection plate part 61 and the fastening part 63.

[0091] In some embodiments, the internal connection tabs 121 can all form bending parts 123; the bending parts 123 of the internal connection tabs 121 are stacked to achieve electrical contact. And the stacking direction is consistent with the electrode side facing direction. And the connection plate part 61 among them is in electrical contact with two internally connected tabs 121 that are in conductive contact. Specifically, along the electrode side facing direction, the connection plate part 61, the bending part 123 of one internal connection tab 121, and the bending part 123 of the other internal connection tab 121 can be stacked in sequence. Generally, a buffer strip 17 is provided between the connection plate part 61 and the body of the battery cell 11. A foam or other buffer structure can also be used. The buffer strip 17 straddles the battery cell bodies on both sides.

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

[0093] In some embodiments, at least one first buffer pad 13 can be provided between adjacent battery cells 11. A buffering effect is formed between adjacent battery cells 11 through the first buffer pad 13. The first buffer pad 13, or other buffer pads (such as the second buffer pad 15 mentioned later), can all be foam, or can be a silica gel pad, etc.

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

[0095] In some embodiments, the first buffer pad 13 is annular. For example, it can be in a square shape or a circular ring shape. Both sides of the ring edge of the first buffer pad 13 are in sealed contact with the two sides of the battery cells 11 respectively, so that the cavity at the center of the ring of the first buffer pad 13 is a closed cavity. The cavity at the center of the ring is mainly formed by surrounding with the ring edge and is blocked by the battery cells 11 on both sides. Specifically, it is preferably to make the first buffer pad 13 in a square ring structure, that is, both the outer contour and the inner contour form a square, or it can also be called a return structure.

[0096] In some embodiments, it is preferably that at least one group of adjacent battery cells 11 is provided with a heat conducting sheet 14, and the adjacent heat conducting sheets 14 are in heat conducting contact with the battery cells 11 on both sides, so that the heat of the battery cells 11 close to both sides of the heat conducting sheet 14 can be conducted out 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 preferably that both sides of the heat conducting sheet 14 are provided with adhesive to adhere to the corresponding battery cells 11 and improve the convenience of installation at the same time.

[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, therefore, the first buffer pad 13 and the heat conducting sheet 14 can be alternately arranged at the gaps between each adjacent battery cells 11. The gaps between each adjacent corresponding battery cells 11 refer to the gaps between each gap. Here, the gap refers to the gap between adjacent battery cells 11.

[0098] For example, along the juxtaposed direction of the battery cells 11, there are the first to eighth battery cells 11. A first heat conducting sheet 14 can be provided between the first battery cell 11 and the second battery cell 11, a second heat conducting sheet 14 can be provided between the third battery cell 11 and the fourth battery cell 11, a third heat conducting sheet 14 can be provided between the fifth battery cell 11 and the sixth battery cell 11, and a fourth heat conducting sheet 14 can be provided between the seventh battery cell 11 and the eighth battery cell 11. And the first buffer pad 13 is provided 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 provided between the eighth battery cell 11 and the ninth battery cell 11, and the fifth heat conducting sheet 14 is provided between the ninth battery cell 11 and the tenth battery cell 11.

[0099] In some embodiments, at least two adjacent heat-conducting sheets 14 are connected to each other outside the battery cell group 1 to form a cylindrical structure in combination. Of course, it is also possible that two adjacent heat-conducting sheets 14 are connected to each other outside the battery cell group 1 to form a cylindrical structure in combination. As described above, along the direction of the juxtaposition of the tab 12, both sides of the first heat-conducting sheet 14 and both sides of the second heat-conducting sheet 14 are connected to form a cylindrical structure, and both sides of the third heat-conducting sheet 14 and both sides of the fourth heat-conducting sheet 14 are connected to form a cylindrical structure. That is, the depth direction of the cylindrical structure is the direction facing the electrode side.

[0100] In some embodiments, if adjacent heat-conducting sheets 14 are connected by an intermediate heat-conducting sheet 14, the intermediate heat-conducting sheet 14 is located outside the battery cell group 1 and can be in heat-conducting contact with the heat-dissipating structure 31 on the bracket 3 to directly transfer heat to the heat-dissipating 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 connected end to end in sequence to form a cylindrical structure.

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

[0102] In some embodiments, an outer layer structure 16 with a coefficient of friction lower than that of the second buffer pad 15 is covered on the side of the second buffer pad 15 away from the battery cell group 1. When installing, generally, after the battery cell group 1 is assembled, at least after the battery cells 11, the first buffer pad 13, the second buffer pad 15, the heat-conducting sheet 14 and other structures are assembled to form a whole, and then this main body is placed into the accommodation cavity 32 from the opening of the accommodation cavity 32. Due to the compact structure, it is difficult to avoid contact between the outer wall of the whole and the inner wall of the accommodation cavity 32. When the outer layer structure 16 with a smaller coefficient of friction is attached to the outside of the second buffer pad 15, compared with the contact between the second buffer pad 15 and the inner wall of the accommodation cavity 32, the contact between the outer layer structure 16 and the inner wall of the accommodation cavity 32 has less resistance. So that the whole is convenient to put in. For the convenience of distinction, the first buffer pad 13 can also be called the internal buffer pad, and the second buffer pad 15 can also be called the external buffer pad. The second buffer pad 15 can also be of an annular structure, with one side in sealed contact with the battery cell 11 and the other side in sealed contact with the outer layer structure 16 to form a closed cavity in the middle to prevent the potting cavity from entering; of course, the second buffer pad 15 can also be directly of a plate structure.

[0103] In some embodiments, the outer layer structure 16 can be a plastic film, and of course, it can also be a plastic plate. Here, it is preferably that the outer layer structure 16 is a release film.

[0104] In some embodiments, the battery cell group 1 can be located within the accommodation cavity 32 of the bracket 3, and a heat-conductive potting adhesive is filled between the battery cell group 1 and the accommodation cavity 32. If there is also a gap between the battery cell group 1 and the intermediate heat-conducting sheet 14, then this gap should also be filled with the potting adhesive. The potting adhesive can fix various structures at the accommodation cavity 32, such as fixing the first buffer pad 13, the second buffer pad 15, the electronic control board 2, the battery cell 11, etc. As described above, the bracket 3 can be in a box structure, with the bracket 3 having an opening on one side. As shown in the attached drawing, there is an opening at the upper part, and the electronic control board 2 covers the opening.

[0105] The potting adhesive can conduct heat. Specifically, a heat-conductive medium can be incorporated, such that not only can the battery cells 11 conduct heat through the potting adhesive, but also between the heat-conducting sheet 14 and the external structure, and between the battery cells 11 and the external structure can conduct heat through the heat-conducting sheet 14. It should be noted that generally, after the whole is placed into the accommodation cavity 32, the fluid potting adhesive is poured in, and after the potting adhesive cures, the fixation of the structure can be achieved. The pouring method of the potting adhesive can also refer to the prior art.

[0106] In some embodiments, the bracket 3 can be embedded with a heat-dissipating structure 31. One side of the heat-dissipating structure 31 faces the accommodation cavity 32 to contact the potting adhesive, and the other side faces the outside of the bracket 3 and is provided with heat-dissipating fins. The structure of the heat-dissipating fins is not limited, as long as it is convenient for external heat dissipation. When the heat-conducting sheet 14 is provided, the heat-conducting sheet 14 can abut against the heat-dissipating structure 31. For example, with the above-mentioned intermediate heat-conducting sheet 14, the intermediate heat-conducting sheet 14 abuts against the heat-dissipating structure 31, so that the heat can be directly transferred out. The heat-dissipating structure 31 can be, for example, a heat-dissipating aluminum sheet. Generally, on both sides of the bracket 3 in the direction of the juxtaposed tabs 12 of the battery cells 11, heat-dissipating structures 31 are provided.

[0107] In some embodiments, the edge of the electronic control board 2 can have a serrated structure 23, which can also be called a wavy structure or a waveform structure. The serrated structure 23 includes alternately arranged tooth portions 231 and groove portions 232. The tooth portions 231 can be square, triangular, or trapezoidal structures, which are not limited. When the tooth portion 231 is square, the serrated structure 23 can be called a square wave structure at this time; when the tooth portion 231 is a triangular structure with an arc transition, the serrated structure 23 can be called a sine wave structure at this time.

[0108] In some embodiments, each tooth portion 231 of the serrated structure 23 can be respectively provided with a voltage signal acquisition pad 24. Preferably, one voltage signal acquisition pad 24 is respectively provided to be connected to the electrical connection piece 6. Preferably, they are arranged in one-to-one correspondence, that is, through the protruding tooth portions 231, the corresponding voltage signal acquisition pads 24 are carried. Specifically, on both sides of the electronic control board 2 in the direction of the juxtaposed tabs 12 of the battery cells 11, the edge portions are both in a serrated structure 23 to be correspondingly arranged with the electrical connection pieces 6 on both sides.

[0109] The groove portions 232 of the zigzag structure 23 are 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 two battery cells 11 and is arranged staggeredly along the juxtaposed direction of the tabs 12 of the battery cells 11, at this time, on one side of the electronic control board 2, the distance between the centers of adjacent tooth portions 231 is exactly the distance between the centers of two battery cells 11. Therefore, groove portions 232 are provided here, which is more convenient for injecting glue into the recessed portion formed between adjacent battery cells 11. This enables the gap between the battery cell group 1 and the cavity wall of the accommodating cavity 32 to be smaller, and at this time, the distance between the edge portion of the battery cell 11 and the cavity wall of the accommodating cavity 32 can be only used for exhausting gas or guiding a small amount of glue. Furthermore, through the above settings, the size of the entire battery pack can be made smaller.

[0110] In some embodiments, preferably, on the electrode side facing direction, an opening sized to match the battery cell group 1 is formed in the corresponding side wall of the accommodating cavity 32 as a pick-and-place opening, and a chamfer 33 can be formed at the edge of the opening. Preferably, a round chamfer 33 is used, and of course, a straight chamfer 33 can also be used.

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

[0112] Of course, in the juxtaposed direction of the battery cells 11, the gap L between the battery cell group 1 and the cavity wall of the accommodating cavity 32: 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 this plane and the cavity wall of the accommodating cavity 32 is used for calculation.

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

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

[0116] In some embodiments, for the convenience of understanding the structure, the juxtaposed direction of the battery cells 11 can be defined as the first direction, that is, the X direction; the juxtaposed direction of the tabs 12 of the battery cells 11 can be defined as the second direction, that is, the Y direction; and the electrode side facing direction can be defined as the third direction, that is, the Z direction.

[0117] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0118] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can 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, Comprising: A battery cell group (1), including a plurality of battery cells (11) arranged in parallel, and a tab (12) is arranged on the electrode side of each of the plurality of battery cells (11); on the electrode side, among the tabs (12): a part of the tabs (12) are internal connection tabs (121), and another part of the tabs (12) are external connection tabs (122); the internal connection tabs (121) between adjacent battery cells (11) are in electrical contact with each other. An electronic control board (2), located on the electrode side of the battery cell group (1), and a first electrical connection row (22) is provided on the electronic control board (2), and the first electrical connection row (22) has a protruding portion (221) protruding towards the battery cell group (1), and the protruding portion (221) is in conductive contact with the external connection tab (122).

2. The battery pack according to claim 1, wherein The external connection tab (122) is the tab in the outermost battery cell (11); along the direction away from the body of the battery cell (11), the extension lengths of the internal connection tab (121) and the external connection tab (122) are the same.

3. The battery pack according to claim 1, characterized in that, The first electrical connection row (22) further includes a base portion (222), the base portion (222) is located on the side of the board body (21) of the electronic control board (2) away from the battery cell group (1), and the protruding portion (221) includes an electrical connection portion (223) and an intermediate connection portion (224); the electrical connection portion (223) is located on the side of the board body (21) of the electronic control board (2) close to the battery cell group (1) and is connected to the external connection tab (122); both ends of the intermediate connection portion (224) are integrally formed and connected to the base portion (222) and the electrical connection portion (223) respectively.

4. The battery pack according to claim 3, wherein In the direction of the orientation of the electrode side, the contact position where two adjacent 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 stacked 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 therebetween.

5. The battery pack according to claim 1, characterized in that, There is at least one electrical connection row, at least one of the electrical connection rows is the first electrical connection row (22), and at least one of the electrical connection rows includes a suspended section (225) and a pressing section (226); the suspended section (225) is suspended on the side of the board body (21) of the electronic control board (2) away from the battery cell group (1), and electrical components are arranged in the gap between the suspended section (225) and the board body of the electronic control board (2), and the pressing section (226) abuts against the board body of the electronic control board.

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

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

8. The battery pack according to claim 7, wherein In the direction of the parallel arrangement of the battery cells, on one side of the battery cell group, there are provided the signal connection row (51), the charging connection row (52), the first pole connection row (53), and the second pole connection row (54). One of the first pole connection row (53) and the second pole connection row (54) is connected to the positive output copper row of the electronic control board (2), and the other is connected to the negative output copper row of the electronic control board (2); 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 connected to the corresponding ports of the external terminal (4).

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

10. The battery pack according to claim 8, wherein, 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 inserted into the corresponding electrical connection rows on the electronic control board (2), and the side surface of the internal connection end (57) is an embossed surface (56), and the embossed surface (56) is soldered to the corresponding electrical connection row of the electronic control board (2).

11. The battery pack according to claim 1, wherein It further includes an electrical connection piece (6). The electrical connection piece (6) includes a connecting plate portion (61), a shrinking portion (62), and a fastening portion (63) which are arranged in sequence. At the edge of the electronic control board (2), there is a voltage signal acquisition solder pad (24) which fits with the fastening portion. The fastening portion (63) is arranged parallel to the connecting plate portion (61) and is located on the side of the electronic control board (2) away from the battery cell group (1); the cross-section of the shrinking portion (62) is smaller than the cross-section of the connecting plate portion (61) and smaller than the cross-section of the fastening portion (63); the internal connection tabs (121) all form bending portions (123); the connecting plate portion (61) is in electrical contact with two of the internal connection tabs (121) which are in conductive contact; along the direction of the electrode side, the connecting plate portion (61), the bending portion of one internal connection tab (121), and the bending portion of the other internal connection tab (121) are stacked in sequence.

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

13. The battery pack according to claim 1, characterized in that, At least one set of first buffer pads (13) are arranged between adjacent ones of the battery cells (11), and the first buffer pads (13) form a closed cavity; the first buffer pads (13) are annular, the annular edges of the first buffer pads (13) are in sealed contact with the battery cells (11) on both sides, and the cavity at the center of the annulus of the first buffer pads (13) is the closed cavity.

14. The battery pack according to claim 13, wherein At least one set of heat conducting sheets (14) are arranged between adjacent ones of the battery cells (11), and the heat conducting sheets (14) are in heat conducting contact with the battery cells (11) on both sides; the first buffer pads (13) and the heat conducting sheets (14) are alternately arranged in the gaps between adjacent battery cells (11); at least one set of two adjacent heat conducting sheets (14) are connected to each other outside the battery cell group (1) to form a cylindrical structure in combination.

15. The battery pack according to claim 1, wherein, Along the direction in which the battery cells (11) are arranged side by side, second buffer pads (15) are arranged on both sides of the battery cell group (1), and an outer layer structure (16) with a friction coefficient lower than that of the second buffer pads (15) covers the side of the second buffer pads (15) away from the battery cell group (1).

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 1-11, characterized in that, It further includes a bracket (3), the bracket (3) is provided with a receiving cavity (32), the battery cell group (1) is located in the receiving cavity (32), a potting adhesive capable of conducting heat is filled between the battery cell group (1) and the receiving cavity (32), a heat dissipation structure (31) is embedded in the bracket (3), one side of the heat dissipation structure (31) faces the receiving cavity (32) to contact the potting adhesive, and the other side faces the outside of the bracket (3) and is provided with heat dissipation fins.

18. The battery pack according to claim 17, characterized in that, The edge of the electronic control board (2) has a serrated structure (23), and a voltage signal acquisition pad (24) is arranged on each tooth part (231) of the serrated structure (23), and the voltage signal acquisition pad (24) is connected to an electrical connection piece (6).

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

20. The battery pack according to claim 18, characterized in that, In the direction in which the tabs (12) of the battery cells (11) are arranged side by side, the gap L between the battery cell group (1) and the wall of the receiving cavity (32): L≤2mm; the hardness H of the potting adhesive: Shore A 35 degrees ≤ H ≤ Shore A 85 degrees.

21. An electrical device, comprising a housing, characterized in that, It further includes a battery pack according to any one of claims 1-20; the battery pack is located in the housing.

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