Battery pack and vehicle

Abstract

The battery pack comprises a battery cell group and a sampling assembly, the battery cell group comprises a plurality of first battery cells and a plurality of second battery cells, and first positive pole columns of the first battery cells are electrically connected with first battery cell shells of the first battery cells; the sampling assembly comprises a circuit board, a plurality of first metal sheets and a plurality of second metal sheets, the first metal sheets are electrically connected with the circuit board and the first battery cell shell respectively, and the second metal sheets are electrically connected with the circuit board and the second positive pole of the second battery cell respectively; all the first metal sheets and all the second metal sheets are located on the same side of the circuit board in the width direction of the circuit board. In the embodiment of the utility model, all the first metal sheets and all the second metal sheets are positioned on the same side of the circuit board along the width direction, and only one side of the circuit board needs to be provided with a connecting structure for connecting the first metal sheets and the second metal sheets, so that the width of the circuit board can be reduced, and the arrangement of the circuit board is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially, relate to a kind of battery pack and vehicle. BACKGROUND

[0002] In electric vehicle, the voltage of multiple cells in single column cell group is usually collected by sampling device, and the sampling device includes flexible printed circuit (FPC) and multiple nickel sheets. The flexible printed circuit is arranged between the positive pole and the negative pole of the cell, and is electrically connected to the positive pole of the cell through the nickel sheet.

[0003] Since the positive pole and the negative pole of the two adjacent cells in the single column cell group are opposite, in order to realize the electrical connection between the flexible printed circuit and the positive pole of each cell, the nickel sheet is arranged on both sides of the flexible printed circuit, and the connecting structure for connecting the nickel sheet arranged on the flexible printed circuit is correspondingly arranged on both sides of the flexible printed circuit.

[0004] However, the width of the above-mentioned flexible printed circuit is large, which is not conducive to the arrangement of the flexible printed circuit. SUMMARY

[0005] The utility model provides a kind of battery pack and vehicle, to at least solve the technical problem that the width of flexible printed circuit for voltage collection of single column cell group in prior art is large, which is not conducive to the arrangement of the flexible printed circuit.

[0006] In the first aspect of the utility model, a battery pack is first provided, which includes a cell group and a sampling assembly. The cell group includes a plurality of first cells and a plurality of second cells. The first cells and the second cells are arranged alternately. The first positive pole of the first cell is electrically connected to the first cell shell of the first cell.

[0007] The sampling assembly includes a circuit board, a plurality of first metal sheets and a plurality of second metal sheets. The first metal sheets are electrically connected to the circuit board and the first cell shell respectively. The second metal sheets are electrically connected to the circuit board and the second positive pole of the second cell respectively. All the first metal sheets and all the second metal sheets are located on the same side of the circuit board along its width direction.

[0008] Optionally, the first cell includes a fuse, and the first positive pole is electrically connected to the first cell shell through the fuse.

[0009] Optionally, the fuse includes a fuse body and two conductive wires connected to both ends of the fuse body. The surface of the conductive wire is covered with an insulating layer.

[0010] Optionally, the first cell shell comprises a first main shell and a first cover plate, the first main shell is connected with the first cover plate and is conductive, the first positive pole is electrically connected with the first cover plate or the first main shell, and the first metal sheet is electrically connected with the first cover plate at the first end portion away from the circuit board.

[0011] Optionally, the battery pack further comprises an insulating support between the circuit board and the cell group.

[0012] The insulating support is provided with a notch, and the first end portion of the first metal sheet passes through the notch and is electrically connected with the first cover plate.

[0013] Optionally, the circuit board comprises a circuit board body and a plurality of cantilever arms, the first metal sheet is electrically connected with the cantilever arm at the second end portion of the circuit board, and / or the second metal sheet is electrically connected with the cantilever arm at the second end portion of the circuit board.

[0014] The cantilever arm is spaced apart from the circuit board body along the width direction of the circuit board, the first end of the cantilever arm along the length direction of the circuit board is connected with the circuit board body, and the second end of the cantilever arm opposite to the first end is at least partially spaced apart from the circuit board body.

[0015] Optionally, the second end portion of the cantilever arm is spaced apart from the circuit board body, and the second end portion of the cantilever arm is connected with the circuit board body.

[0016] The width of the portion of the second end of the cantilever arm connected with the circuit board body is less than or equal to 1 mm.

[0017] Optionally, the battery pack further comprises a bus bar group, and a plurality of cells of the cell group are electrically connected through the bus bar group.

[0018] The bus bar group comprises a plurality of first bus bars, the first bus bar is electrically connected with the first negative pole of the first cell and the second positive pole of the second cell, the plurality of first bus bars are located on the same side of the circuit board as the second metal sheet, and the second end portion of the second metal sheet away from the circuit board is welded with the portion of the first bus bar electrically connected with the second positive pole.

[0019] Optionally, the first end portion of the first metal sheet away from the circuit board is welded with the first cell shell.

[0020] In the second aspect of the embodiment of the utility model, a vehicle comprising the battery pack is also provided.

[0021] In the embodiment of the utility model, first positive pole post and first electric core shell are electrically connected, first metal sheet and first electric core shell are electrically connected, so that first metal sheet is electrically connected with first positive pole post through first electric core shell, and the arrangement of first metal sheet electrically connected with first electric core shell is not affected by the position of first positive pole post, so that first metal sheet can be arranged on the same side with second metal sheet.

[0022] In the embodiment of the utility model, all first metal sheets and all second metal sheets are located on the same side of the circuit board along the width direction of the circuit board, only one side of the circuit board needs to be provided with the connecting structure for connecting the first metal sheet and the second metal sheet, the sampling assembly adopts the single-side sampling mode, compared with the double-side sampling, the width of the circuit board can be reduced, and the arrangement of the circuit board is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below.

[0024] Figure 1 The structural schematic diagram of the battery pack, the sampling assembly, the busbar group, the insulating support and the electric core group provided in the embodiment of the utility model are shown in the embodiment of the utility model.

[0025] Figure 2 The connection schematic diagram of the first metal sheet and the second metal sheet in the battery pack provided in the embodiment of the utility model is shown in the embodiment of the utility model.

[0026] Figure 3 The structural schematic diagram of the first electric core in the battery pack provided in the embodiment of the utility model is shown in the embodiment of the utility model. Figure 1 ;

[0027] Figure 4 The structural schematic diagram of the first electric core in the battery pack provided in the embodiment of the utility model is shown in the embodiment of the utility model. Figure 2 .

[0028] Reference signs:

[0029] 1-sampling assembly, 11-circuit board, 111-circuit board main body, 112-cantilever, 113-first gap, 12-first metal sheet, 13-second metal sheet, 2-busbar group, 21-first busbar, 211-first part, 212-second part, 22-second busbar, 23-third busbar, 3-insulating support, 4-electric core group, 41-first electric core, 411-first positive pole post, 412-first negative pole post, 413-first electric core shell, 4131-first cover plate, 4132-first main shell, 414-fuse, 42-second electric core. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present utility model will be described below with reference to the drawings in the embodiments of the present utility model.

[0031] The embodiments of the present utility model are only used for explaining the present utility model and are not used for limiting the scope of the present utility model. The present utility model is described in a more specific manner with reference to the drawings in the following paragraphs by way of example. It should be noted that the drawings are all in a very simplified form and all use non-precise proportions, and are only used for the purpose of conveniently and clearly assisting in the description of the embodiments of the present utility model.

[0032] In the related art, since the positive and negative poles of the two adjacent battery cells in the single-column battery cell group are opposite, in order to realize the electrical connection between the flexible circuit board and the positive pole of each battery cell, the nickel sheet is arranged on both sides of the flexible circuit board, and the connecting structure for connecting the nickel sheet arranged on the flexible circuit board is correspondingly arranged on both sides of the flexible circuit board. However, the width of the above-mentioned flexible circuit board is large, which is not conducive to the arrangement of the flexible circuit board. For example, for a battery pack of a high-voltage platform, the number of battery cells in the single-column battery cell group is large, the width for wiring on the flexible circuit board is large, and in addition to the width of the connecting structure on both sides, the width of the flexible circuit board is large, and in the case that the distance between the positive pole and the negative pole of the battery cell is limited, the arrangement space of the flexible circuit board is insufficient.

[0033] In order to solve the above-mentioned problems, the embodiments of the present utility model provide a battery pack and a vehicle, and the above-mentioned battery pack and vehicle will be described in detail.

[0034] In the first aspect, with reference to Figures 1 to 4 The battery pack provided by the embodiments of the present utility model comprises a battery cell group 4 and a sampling assembly 1, the battery cell group 4 comprises a plurality of first battery cells 41 and a plurality of second battery cells 42, the first battery cells 41 and the second battery cells 42 are arranged alternately, the first positive pole 411 of the first battery cell 41 is electrically connected with the first battery cell shell 413 of the first battery cell 41, the sampling assembly 1 comprises a circuit board 11 and a plurality of metal sheets, the plurality of metal sheets comprises a plurality of first metal sheets 12 and a plurality of second metal sheets 13, the first metal sheets 12 are respectively electrically connected with the circuit board 11 and the first battery cell shell 413, the second metal sheets 13 are respectively electrically connected with the circuit board 11 and the second positive pole of the second battery cell 42, and all the first metal sheets 12 and all the second metal sheets 13 are located on the same side of the circuit board 11 along the width direction of the circuit board 11.

[0035] Among them, the battery cell group 4 comprises a plurality of battery cells arranged in sequence, and the arrangement direction of the plurality of battery cells can refer to Figure 1The direction of the middle A arrow is shown. One sampling assembly 1 is used for collecting the voltage information of the plurality of battery cells of one battery cell group 4. Along the arrangement direction of the plurality of battery cells, the plurality of battery cells includes a plurality of first battery cells 41 and a plurality of second battery cells 42 arranged alternately, the first battery cells 41 and the second battery cells 42 are adjacent, and the positive and negative poles of the first battery cells 41 and the second battery cells 42 are opposite.

[0036] The first battery cell shell 413 is electrically connected with the first positive pole post 411, so that the first battery cell shell 413 is positively charged. The first positive pole post 411 can be electrically connected with the first battery cell shell 413 through a fuse 414, a conductive wire, a conductive sheet, etc. As an example, the second battery cell 42 is the same as the first battery cell 41 in structure, and the second positive pole post of the second battery cell 42 is also electrically connected with the second battery cell shell of the second battery cell 42. As another example, the second battery cell 42 is different from the first battery cell 41 in that the second positive pole post of the second battery cell 42 is not electrically connected with the second battery cell shell of the second battery cell 42.

[0037] The second positive pole post of the second battery cell 42 is not electrically connected with the second battery cell shell of the second battery cell 42.

[0038] The circuit board 11 is specifically a flexible circuit board, the width direction of the circuit board 11 is perpendicular to the arrangement direction of the plurality of battery cells of the battery cell group 4, and the width direction of the circuit board 11 can be referred to as the direction of the middle B arrow. Figure 1 The direction of the middle B arrow is shown. The material of the first metal sheet 12 and the second metal sheet 13 can be nickel, copper, etc. The second metal sheet 13 can be electrically connected with the second positive pole post of the second battery cell 42 through the first bus sheet 21. The connection mode of the first metal sheet 12 with the circuit board 11 and the first battery cell shell 413 can be welding, riveting, screw connection, etc. The connection mode of the second metal sheet 13 with the circuit board 11 and the first bus sheet 21 can be welding, riveting, screw connection, etc.

[0039] The circuit board 11 is electrically connected with the battery management unit. A plurality of independent sampling lines are arranged on the circuit board 11, each sampling line is used for collecting the voltage information of different battery cells, and the first metal sheet 12 and the second metal sheet 13 are electrically connected with the sampling lines. The circuit board 11 collects the voltage information of the first battery cell 41 through the first metal sheet 12 and collects the voltage information of the second battery cell 42 through the second metal sheet 13. As an example, a negative reference sampling line can also be arranged on the circuit board 11, the negative reference sampling line is electrically connected with the negative pole of the most edge battery cell of the battery cell group 4 through a third metal sheet, and the third metal sheet is located on the same side as the first metal sheet 12 and the second metal sheet 13. As another example, the battery management unit can be directly connected with the negative pole of the most edge battery cell of the battery cell group 4 through a wire.

[0040] In the embodiment, the first positive pole 411 is electrically connected with the first battery shell 413, and the first metal sheet 12 is electrically connected with the first battery shell 413, so that the first metal sheet 12 is electrically connected with the first positive pole 411 through the first battery shell 413. The arrangement of the first metal sheet 12 electrically connected with the first battery shell 413 is not affected by the position of the first positive pole 411, so that the first metal sheet 12 can be arranged on the same side as the second metal sheet 13.

[0041] In the embodiment, all the first metal sheets 12 and all the second metal sheets 13 are located on the same side of the circuit board 11 along the width direction of the circuit board 11. Only one side of the circuit board 11 needs to be provided with the connecting structure for connecting the first metal sheet 12 and the second metal sheet 13. The sampling assembly 1 adopts a single-side sampling mode, which can reduce the width of the circuit board 11 and facilitate the arrangement of the circuit board 11 compared with a double-side sampling mode.

[0042] It should be noted that in the embodiment, the connecting structure for connecting the first metal sheet 12 and the second metal sheet 13 on the circuit board 11 can be the cantilever 112.

[0043] In some embodiments, referring to Figure 3 and Figure 4 , the first battery 41 includes a fuse 414, and the first positive pole 411 is electrically connected with the first battery shell 413 through the fuse 414.

[0044] In the embodiment, the first battery shell 413 includes a first main shell 4132 and a first cover plate 4131, the first cover plate 4131 includes a first metal body and a first insulating piece, one end of the fuse 414 is electrically connected with the first positive pole 411, and the other end of the fuse 414 is electrically connected with the first metal body of the first cover plate 4131 or the first main shell 4132. The connection mode of the fuse 414 with the first positive pole 411 and the first battery shell 413 can be welding. Through the arrangement of the fuse 414, the electrical connection between the first positive pole 411 and the first battery shell 413 can be actively disconnected in the case of short circuit of the first battery shell 413, thereby improving safety.

[0045] In some embodiments, the fuse 414 includes a fuse main body and two conductive wires connected to both ends of the fuse main body, and the surface of the conductive wire is covered with an insulating layer. The insulating layer can be made of a high-temperature-resistant and corrosion-resistant material. Through the arrangement of the insulating layer, short circuit or abnormal current caused by accidental contact between the internal conductive structure of the battery and the conductive wire can be avoided.

[0046] In some embodiments, referring to Figure 3 and Figure 4The first cell shell 413 includes a first main shell 4132 and a first cover plate 4131. The first main shell 4132 is connected to the first cover plate 4131 and is electrically conductive. The first positive pole 411 is electrically connected to the first cover plate 4131 or the first main shell 4132. The first end of the first metal sheet 12 away from the circuit board 11 is electrically connected to the first cover plate 4131. In this embodiment, the first cover plate 4131 is located closer to the first metal sheet 12. The first metal sheet 12 is electrically connected to the first cover plate 4131, which can reduce the size of the first metal sheet 12 and shorten the electrical transmission path.

[0047] The first cover plate 4131 includes a first metal body and a first insulating piece. The first positive pole 411 is electrically connected to the first metal body of the first cover plate 4131 or the first main shell 4132. The first end of the first metal sheet 12 away from the circuit board 11 is electrically connected to the first metal body. The first metal body and the first main shell 4132 can be made of aluminum.

[0048] As an example, referring to Figure 3 , the first positive pole 411 is electrically connected to the first metal body of the first cover plate 4131. As another example, referring to Figure 4 , the first positive pole 411 is electrically connected to the first main shell 4132. In this example, the first metal body is connected to the first main shell 4132 and is electrically conductive. The first metal body and the first main shell 4132 can be connected by welding, bonding, or the like. The first metal sheet 12 is electrically connected to the first positive pole 411 through the first metal body and the first main shell 4132.

[0049] In some embodiments, referring to Figure 1 and Figure 2 , the battery pack further includes an insulating support 3 located between the circuit board 11 and the cell group 4. The insulating support 3 has a notch through which the first end of the first metal sheet 12 is electrically connected to the first cover plate. The insulating support 3 is located between the circuit board 11 and the cell group 4, which can achieve electrical insulation between the circuit board 11 and the cell group 4. Through the notch in the insulating support 3, the first metal sheet 12 can pass through the notch and be directly connected to the first cover plate without the need for additional electrical connection structures.

[0050] In some embodiments, referring to Figure 2, the circuit board 11 comprises a circuit board body 111 and a plurality of cantilevers 112, the first metal sheet 12 is electrically connected to the cantilevers 112 near the second end of the circuit board 11, and / or the second metal sheet 13 is electrically connected to the cantilevers 112 near the second end of the circuit board 11; along the width direction of the circuit board 11, the cantilevers 112 are spaced apart from the circuit board body 111, the first end of the cantilevers 112 along the length direction of the circuit board 11 is connected to the circuit board body 111, and the second end opposite to the first end of the cantilevers 112 is at least partially spaced apart from the circuit board body 111.

[0051] Preferably, the first metal sheet 12 is electrically connected to the cantilevers 112 near the second end of the circuit board 11, and the second metal sheet 13 is electrically connected to the cantilevers 112 near the second end of the circuit board 11. The design of the cantilevers 112 allows the first metal sheet 12 and the second metal sheet 13 to move in the expansion direction of the battery cell. Along the width direction of the circuit board 11, the cantilevers 112 are spaced apart from the circuit board body 111 by the first gap 113. Along the length direction of the circuit board 11, the second end of the cantilevers 112 is at least partially spaced apart from the circuit board body 111 by the second gap. The length direction of the circuit board 11 is parallel to the arrangement direction of the plurality of battery cells of the battery cell group 4.

[0052] The battery cell will expand after long-term use. In this embodiment, after the battery cell expands, the first metal sheet 12 and the second metal sheet 13 can move synchronously in the expansion direction of the battery cell, and the cantilevers 112 correspondingly deform, which can avoid the first metal sheet 12 and the second metal sheet 13 being subjected to pulling force after the battery cell expands, and ensure the stability of the electrical connection of the two end portions of the first metal sheet 12 and the second metal sheet 13.

[0053] Along the width direction of the circuit board 11, the sum of the width of the cantilevers 112 and the width of the first gap 113 is about 11 mm. In this embodiment, only one side of the circuit board 11 needs to be provided with the cantilevers 112, compared with providing the cantilevers 112 on both sides, one side of the cantilevers 112 can be removed, and the width of the circuit board 11 can be reduced by 11 mm.

[0054] In some embodiments, the second end portion of the cantilevers 112 is spaced apart from the circuit board body 111, and the second end portion of the cantilevers 112 is connected to the circuit board body 111; along the width direction of the circuit board 11, the width of the portion of the second end of the cantilevers 112 connected to the circuit board body 111 is less than or equal to 1 mm.

[0055] The width of the part of the second end of the cantilever 112 spaced apart from the circuit board body 111 is greater than the width of the part of the second end of the cantilever 112 connected to the circuit board body 111. In the embodiment, the second end of the cantilever 112 is connected to the circuit board body 111, and the width of the connection is less than or equal to 1 mm. On the one hand, the processing and manufacturing of the circuit board 11 are facilitated. On the other hand, the part of the second end of the cantilever 112 connected to the circuit board body 111 is easily disconnected after the expansion of the battery cell.

[0056] In some embodiments, the second end of the cantilever 112 is entirely spaced apart from the circuit board body 111.

[0057] In some embodiments, referring to Figure 1 and Figure 2 , the battery further includes a bus bar group 2, and the plurality of battery cells of the battery cell group 4 are electrically connected through the bus bar group 2. The bus bar group 2 includes a plurality of first bus bars 21, the first bus bars 21 electrically connect the first negative pole 412 of the first battery cell 41 and the second positive pole of the second battery cell 42, the plurality of first bus bars 21 and the second metal sheet 13 are located on the same side of the circuit board 11, and the first end of the second metal sheet 13 away from the circuit board 11 is welded to the part of the first bus bar 21 electrically connected to the second positive pole.

[0058] The bus bar group 2 includes a plurality of bus bars, the material of the bus bar can be aluminum, and the connection mode of the bus bar and the pole of the battery cell can be welding. The bus bar is also connected to the insulating support 3, and the connection mode of the bus bar and the insulating support 3 can be clamping, riveting, etc. The first bus bar 21 electrically connects the first negative pole 412 of the first battery cell 41 and the second positive pole of the next second battery cell 42. The bus bar group 2 further includes a third bus bar 23, and the third bus bar 23 is electrically connected to the first positive pole 411 of the rightmost first battery cell 41. The bus bar group 2 further includes a plurality of second bus bars 22, and the second bus bars 22 electrically connect the second negative pole of the second battery cell 42 and the first positive pole 411 of the next first battery cell 41.

[0059] The first bus bar 21 includes a first part 211 and a second part 212, the first part 211 is electrically connected to the first negative pole 412 of the first battery cell 41, and the second part 212 is electrically connected to the second positive pole of the next second battery cell 42. The first end of the second metal sheet 13 is welded to the second part 212. In the embodiment, the second metal sheet 13 is electrically connected to the second positive pole of the second battery cell 42 through the first bus bar 21, and no additional electrical connection structure is needed.

[0060] In some embodiments, the first end of the first metal sheet 12 away from the circuit board 11 is welded to the first battery cell shell 413, which can improve the reliability of the electrical connection of the first end of the first metal sheet 12.

[0061] As an example, with reference to Figure 1 , by Figure 1 The right side points to the left side, and the plurality of battery cells of the battery cell group 4 are sequentially the first battery cell, the second battery cell, the third battery cell, the fourth battery cell, the fifth battery cell, the sixth battery cell, the seventh battery cell, the eighth battery cell, and the ninth battery cell. Among them, the first battery cell, the third battery cell, the fifth battery cell, the seventh battery cell, and the ninth battery cell are the first battery cell 41, and the second battery cell, the fourth battery cell, the sixth battery cell, and the eighth battery cell are the second battery cell 42.

[0062] The third bus bar 23 is electrically connected with the positive pole of the first battery cell, the first bus bar 21 corresponding to the position of the third bus bar 23 is electrically connected with the negative pole of the first battery cell and the positive pole of the second battery cell, the second bus bar 22 corresponding to the first bus bar 21 is electrically connected with the negative pole of the second battery cell and the positive pole of the third battery cell, and so on, so that the nine battery cells are electrically connected through the bus bar group 2.

[0063] In the second aspect, the utility model provides a kind of vehicle, and vehicle includes the battery pack provided in the first aspect.Therefore, the vehicle also has the beneficial effects of the above-mentioned battery pack, which will not be repeated here.

[0064] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the listed element.

[0065] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present. When an element is referred to as being "set up on" another element, it can be directly set up on the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0066] The various embodiments in the specification are described in a relevant manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0067] The above only describes the preferred embodiments of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

[0068] The battery pack and vehicle provided by the utility model are described in detail, the principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment is only used to help understand the structure and core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will have changes, and the above is not understood as the limitation of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises a cell group and a sampling assembly, the cell group comprises a plurality of first cells and a plurality of second cells, the first cells and the second cells are arranged alternately, a first positive pole of the first cell is electrically connected with a first cell shell of the first cell; The sampling assembly comprises a circuit board, a plurality of first metal sheets and a plurality of second metal sheets, the first metal sheets are electrically connected with the circuit board and the first cell shell respectively, the second metal sheets are electrically connected with the circuit board and a second positive pole of the second cell respectively, all the first metal sheets and all the second metal sheets are located on the same side of the circuit board along the width direction of the circuit board.

2. The battery pack of claim 1, wherein, The first cell comprises a fuse, the first positive pole is electrically connected with the first cell shell through the fuse.

3. The battery pack of claim 2, wherein, The fuse comprises a fuse main body and two conductive wires connected to both ends of the fuse main body, the surface of the conductive wire is covered with an insulating layer.

4. The battery pack of any one of claims 1 to 3, wherein, The first cell shell comprises a first main shell and a first cover plate, the first main shell is connected with the first cover plate and is conductive, the first positive pole is electrically connected with the first cover plate or the first main shell, the first end of the first metal sheet away from the circuit board is electrically connected with the first cover plate.

5. The battery pack of claim 4, wherein, The battery pack further comprises an insulating support, the insulating support is located between the circuit board and the cell group; A notch is formed on the insulating support, the first end of the first metal sheet passes through the notch and is electrically connected with the first cover plate.

6. The battery pack of any one of claims 1 to 5, wherein, The circuit board comprises a circuit board main body and a plurality of cantilevers, the second end of the first metal sheet close to the circuit board is electrically connected with the cantilever, and / or the second end of the second metal sheet close to the circuit board is electrically connected with the cantilever; Along the width direction of the circuit board, the cantilever is spaced apart from the circuit board main body, the first end of the cantilever along the length direction of the circuit board is connected with the circuit board main body, and the second end of the cantilever opposite to the first end is at least partially spaced apart from the circuit board main body.

7. The battery pack of claim 6, wherein, The second end of the cantilever is partially spaced apart from the circuit board main body, and the second end of the cantilever is connected with the circuit board main body; Along the width direction of the circuit board, the width of the part of the second end of the cantilever connected with the circuit board main body is less than or equal to 1mm.

8. The battery pack of any one of claims 1-7, wherein, The battery pack further comprises a bus bar group, a plurality of cells of the cell group are electrically connected through the bus bar group; The bus bar group comprises a plurality of first bus bars, the first bus bars electrically connect the first negative pole of the first cell and the second positive pole of the second cell, a plurality of the first bus bars are located on the same side of the circuit board as the second metal sheets, and the first end of the second metal sheet away from the circuit board is welded with the part of the first bus bar electrically connected with the second positive pole.

9. The battery pack of any one of claims 1-7, wherein, The first end of the first metal sheet away from the circuit board is welded with the first cell shell.

10. A vehicle characterized by comprising: The battery pack comprises the battery pack of any one of claims 1 to 9.

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