Battery cell assembly, battery module and battery pack

Abstract

The utility model belongs to a battery cell assembly, a battery module and a battery pack in the technical field of power batteries. The battery cell assembly comprises a plurality of battery cells which are stacked into an odd-number sequence battery cell group and an even-number sequence battery cell group; the connector is provided with an even sequence interface group and an odd sequence interface group; the plurality of first sampling pieces are provided with first connecting positions and first sampling positions connected with the even-number sequence battery cell groups; the first flexible circuit board is provided with a plurality of first etching lines, and the input ends and the output ends of the first etching lines are respectively connected with the first connecting positions and the even-number sequence interface groups; the plurality of second sampling pieces are provided with second connecting positions and second sampling positions connected with the odd number sequence battery cell groups; the second flexible circuit board is provided with a plurality of second etching lines, the input ends and the output ends of the second etching lines are connected with the second connecting positions and the odd-number-sequence interface sets respectively, and the second sampling pieces at least stride across the second etching lines corresponding to the second sampling pieces. The compatibility is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a battery core assembly, a battery module and a battery pack. Background Art

[0002] Currently, in the power system of new energy vehicles, the collected voltage signals of the battery cells are transmitted to the battery management system (BMS) for diagnosis and control through a flexible printed circuit (FPC). To facilitate the collection of the voltage of the battery cells, the input end of the flexible printed circuit board is connected to the corresponding battery cells through multiple sampling elements, and the output end of the flexible printed circuit board is connected to the interface of the connector of the battery management system. Because the connector is limited by the difficulty of winding the internal loop, there are certain requirements for the voltage difference between adjacent interfaces. In addition, in order to be compatible with the sampling requirements of different battery modules, the interface order of the connector is generally set according to the AFE (Active Front End, analog front end, the input end of the processing chain, the circuit for analog signal processing) sequence, which is difficult to change with the voltage change of the battery cell. Therefore, in order to adapt to the connection requirements, the internal loop of the flexible printed circuit board is prone to cross-over problems. In order to avoid the crossover of internal circuits in flexible circuit boards, double-sided flexible circuit boards are generally used at present. Two layers of flexible circuits are laminated together to form conductive circuits between different layers. The conductive circuits between two different layers need to add via structures to achieve connection and are covered with protective film on both sides, which increases the wiring density per unit area. The etching circuits are more complicated, the process is relatively cumbersome, and the control is difficult. In addition, the cost is high and the manufacturability is poor, which is not conducive to the cost control of power batteries. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a battery cell assembly, a battery module and a battery pack to solve the problem of difficulty in connecting the flexible circuit board and the connector in the interface sequence corresponding to each other in the prior art, so as to simplify the structure, process and reduce costs.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a battery cell assembly, comprising:

[0005] A plurality of battery cells, wherein the plurality of battery cells are stacked and arranged to form an odd-numbered battery cell group and an even-numbered battery cell group;

[0006] A connector having an even-numbered interface group and an odd-numbered interface group distributed in two layers, wherein the multiple interfaces of the even-numbered interface group and the multiple interfaces of the odd-numbered interface group are arranged in descending order or ascending order along a first direction;

[0007] A plurality of first sampling components, each of the first sampling components having a first connection position and a first sampling position connected to the even-numbered sequence battery cell group;

[0008] a first flexible circuit board having a plurality of first etching lines, wherein input ends of the plurality of first etching lines are connected to corresponding first connection bits, output ends of the plurality of first etching lines are arranged in the same order as the even-numbered interface group and are connected thereto, and the first connection bits and the first sampling bits are located on the same side of the first etching lines;

[0009] a plurality of second sampling components, each of the second sampling components having a second connection position and a second sampling position connected to the odd-numbered battery cell group;

[0010] A second flexible circuit board is provided, wherein the second flexible circuit board has a plurality of second etched lines, wherein input ends of the plurality of second etched lines are connected to corresponding second connection bits, output ends of the plurality of second etched lines are arranged in the same order as and connected to the odd-numbered interface group, and the second sampling element at least spans the corresponding second etched line to distribute the second connection bits and the second sampling bits on both sides of the second etched line.

[0011] Optionally, a first crack-stopping groove is provided on the first flexible circuit board, and at least a portion of the first crack-stopping groove is located between the first connection position and the first etching line.

[0012] Optionally, the first crack-stopping groove is in a U-shaped structure with its opening facing the first connecting position and the first sampling position.

[0013] Optionally, the first connection position is welded and fixed to the input end of the first etching line, and the area of ​​the first flexible circuit board located inside the first crack-stopping groove is used to form a pad placement position.

[0014] Optionally, a second crack-stopping groove is provided on the second flexible circuit board, and at least a portion of the second crack-stopping groove is located between the second connection position and the second etching line.

[0015] Optionally, the second crack-stopping groove is in a U-shaped structure with its opening facing the second connecting position.

[0016] Optionally, the second connection position is fixed to the input end of the second etching line by welding, and the area of ​​the second flexible circuit board located inside the second crack-stopping groove is used to form a pad placement position.

[0017] Optionally, the first flexible circuit board has a first insulating film, and the thickness of the first insulating film at a portion overlapping with the first sampling piece is greater than the thickness of the remaining portions of the first insulating film; the first flexible circuit board has a second insulating film, and the thickness of the second insulating film at a portion overlapping with the second sampling piece is greater than the thickness of the remaining portions of the second insulating film.

[0018] Optionally, the first connection positions of multiple first sampling members are located on the same horizontal plane and aligned in the extension direction of the first flexible circuit board; the second connection positions of multiple second sampling members are located on the same horizontal plane and aligned in the extension direction of the second flexible circuit board.

[0019] Optionally, the first flexible circuit board and the second flexible circuit board both extend along the stacking direction of the multiple battery cells, the first flexible circuit board and the second flexible circuit board are arranged along the length direction of the battery cells, and the first flexible circuit board and the second flexible circuit board are both located between two poles distributed at both ends of the battery cells.

[0020] To achieve the above-mentioned purpose and other related purposes, the present application also provides a battery module, including the battery cell assembly described above.

[0021] To achieve the above-mentioned objectives and other related objectives, the present application also provides a battery pack comprising the battery cell assembly described above.

[0022] As described above, the battery cell assembly, battery module and battery pack of the present invention have at least the following beneficial effects: the first flexible circuit board and the second flexible circuit board are respectively connected to the connector, and the transmission requirements can be met without using a double-sided flexible circuit board, which is conducive to simplifying the structure and reducing costs; based on this, the second sampling piece crosses the second etching line of the second flexible circuit board, so that the multiple second etching lines do not need to be arranged in a cross-arrangement and can be arranged in the same order as the multiple interfaces of the connected odd-sequence interface group, and there is no need to use additional wiring harness conversion, which is conducive to reducing the connector's requirements for the order of multiple battery cells, and can adapt to battery cell groups with different voltage sequences, improve the compatibility of the connector, and thus help further reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a partial structural diagram of an embodiment of a battery cell assembly of the present utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the explosion of the battery cell assembly;

[0025] Figure 3 A top view of a partial structure of an embodiment of a battery cell assembly of the present invention;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the connector;

[0027] Figure 5 for Figure 1 A schematic structural diagram of the first flexible circuit board;

[0028] Figure 6 for Figure 1 A schematic structural diagram of the second flexible circuit board;

[0029] Figure 7 for Figure 1 A local enlarged schematic diagram in .

[0030] Part Number Description

[0031] Bar 1, connector 2, even-numbered interface group 21, odd-numbered interface group 22, interface 23, first sampling component 3, first connection position 31, first sampling position 32, first flexible circuit board 4, first etching line 41, first crack stop groove 42, second sampling component 5, second connection position 51, second sampling position 52, second flexible circuit board 6, second etching line 61, second crack stop groove 62, pad placement position 7, blister isolation plate 8. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0034] See also Figures 1 to 7In some optional embodiments, the present application provides a battery cell assembly, which includes a plurality of battery cells, a battery management system, a plurality of first sampling parts 3, a first flexible circuit board 4, a plurality of second sampling parts 5 and a second flexible circuit board 6. In addition to the above components, the battery cell assembly may also include a blister isolation plate 8. The plurality of battery cells are stacked to form an odd-sequence battery cell group sorted as odd numbers and an even-sequence battery cell group sorted as even numbers. The battery management system includes a connector 2, which has an even-sequence interface group 21 and an odd-sequence interface group 22 distributed in two layers. The multiple interfaces 23 of the even-sequence interface group 21 and the multiple interfaces 23 of the odd-sequence interface group 22 are arranged in descending order or ascending order along the first direction, and the even-sequence interface group 21 is located above the odd-sequence interface group 22. The first sampling component 3 has a first connection position 31 and a first sampling position 32 connected to the even-numbered cell group. The first sampling position 32 can be connected to the cell's tab 1 for sampling. The tab 1 is electrically connected to the cell's pole, wherein poles are provided at both ends of the cell in the length direction of the cell. The first flexible circuit board 4 has a plurality of first etching lines 41. The input ends of the plurality of first etching lines 41 are connected to the corresponding first connection positions 31. The output ends of the plurality of first etching lines 41 are arranged in the same order as the even-numbered interface group 21 and are connected. The first connection position 31 and the first sampling position 32 are located on the same side of the first etching line 41. The second sampling component 5 has a second connection position 51 and a second sampling position 52 connected to the odd-numbered cell group. The second sampling position 52 can be connected to the cell's tab 1 for sampling. The second flexible circuit board 6 has a plurality of second etched lines 61. The input ends of the plurality of second etched lines 61 are connected to the corresponding second connection positions 51. The output ends of the plurality of second etched lines 61 are arranged in the same order as and connected to the odd-numbered interface group 22. The second sampling element 5 at least crosses the corresponding second etched line 61 to distribute the second connection positions 51 and the second sampling positions 52 on both sides of the second etched line 61.

[0035] Optionally, the first flexible circuit board 4 has a first insulating film, and the first etching line 41 is sandwiched between two layers of oppositely arranged insulating films. The thickness of the portion of the first insulating film overlapping with the first sampling piece 3 is greater than the thickness of the remaining portions of the first insulating film. Among them, the first sampling piece 3 can be a nickel sheet, the first connection position 31 is welded and fixed to the first flexible circuit board 4, and the first sampling position 32 is welded and fixed to the bar sheet 1 of the corresponding battery cell. The thickness of the portion of the first insulating film overlapping with the nickel sheet is thicker than the thickness of the remaining portions of the first insulating film, which is beneficial to protecting the first etching line 41 and reducing the risk of interference from nickel sheet burrs. Furthermore, the first insulating film can be a polyimide film (PI film for short), which has good insulating properties.

[0036] Optionally, the first flexible circuit board 4 has a second insulating film, and the thickness of the portion of the second insulating film overlapping with the second sampling member 5 is greater than the thickness of the remaining portion of the second insulating film. The second sampling member 5 can be a nickel sheet, the second connection position 51 is welded and fixed to the second flexible circuit board 6, and the second sampling position 52 is welded and fixed to the corresponding battery cell's bar sheet 1. The thickness of the portion of the second insulating film overlapping with the nickel sheet is thicker than the thickness of the remaining portion of the second insulating film, which is beneficial for protecting the second etched line 61 and reducing the risk of interference from nickel sheet burrs. Furthermore, the second insulating film can be a polyimide film with good insulation properties.

[0037] Optionally, a blister isolation plate 8 is located on the top of the battery cell, and the blister isolation plate 8 insulates at least part of the first flexible circuit board 4 from the battery cell and insulates at least part of the second flexible circuit board 6 from the battery cell.

[0038] Optionally, multiple first sampling parts 3 are distributed along the stacking direction of multiple battery cells, and the first connection positions 31 of the multiple first sampling parts 3 are located on the same horizontal plane and aligned in the extension direction of the first flexible circuit board 4. That is, the multiple first connection positions 31 are on the same horizontal line, which facilitates connection operations, especially during welding.

[0039] Optionally, multiple second sampling parts 5 are distributed along the stacking direction of multiple battery cells, and the second connection positions 51 of the multiple second sampling parts 5 are located on the same horizontal plane and aligned in the extension direction of the second flexible circuit board 6. That is, the multiple second connection positions 51 are on the same horizontal line, which facilitates connection operations, especially during welding.

[0040] Optionally, the first flexible circuit board 4 and the second flexible circuit board 6 both extend along the stacking direction of the multiple battery cells, the first flexible circuit board 4 and the second flexible circuit board 6 are arranged along the length direction of the battery cells, and the first flexible circuit board 4 and the second flexible circuit board 6 are both located between the two poles distributed at both ends of the battery cells. In this application, the stacking direction of the multiple battery cells, the width direction of the battery cells, the extension direction of the first flexible circuit board 4, and the extension direction of the second flexible circuit board 6 are the same, that is, the X direction in the accompanying drawings; the length direction of the battery cells, the arrangement direction of the multiple first etching lines 41, the arrangement direction of the multiple second etching lines 61, the arrangement direction of the multiple interfaces 23 of the odd-numbered interface group 22, and the arrangement direction of the multiple interfaces 23 of the even-numbered interface group 21 are the same as the first direction, that is, the Y direction in the accompanying drawings; the height direction of the battery cells, the thickness direction of the first flexible circuit board 4, the thickness direction of the first insulating film, the thickness direction of the second flexible circuit board 6, and the thickness direction of the second insulating film are the same, that is, the Z direction in the accompanying drawings.

[0041] In the battery cell assembly of the above embodiment, the first flexible circuit board 4 collects the voltage of the even-numbered battery cell group, and the second flexible circuit board 6 collects the voltage of the odd-numbered battery cell group. The first flexible circuit board 4, the first sampling component 3, the second flexible circuit board 6 and the second sampling component 5 cooperate to flexibly change the voltage collection order to correspond to the order of the interface 23 of the connector 2; specifically, by changing the layout position of the second etched line 61 inside the second flexible circuit board 6, the second etched line 61 is located between the second connection position 51 and the second sampling position 52 corresponding to the second sampling component 5, and the positional relationship between the second etched line 61 and the second connection position 51 is reversed, so that multiple second etched lines 61 can reverse the voltage collection order without crossing, which not only reduces the interference with the second etched line 61, but also can flexibly match the interface 23 of the connector 2, which is beneficial to improving the compatibility of the connector 2, does not require additional conversion, simplifies the process, and reduces costs.

[0042] See also Figures 1 to 3 and Figure 5 In some optional embodiments, a first crack-stop groove 42 is provided on the first flexible circuit board 4, and at least a portion of the first crack-stop groove 42 is located between the first connection position 31 and the first etched line 41. The first connection position 31 is fixedly connected to the outer edge of the first flexible circuit board 4, and the outer side of the first flexible circuit board 4 refers to the side away from the second flexible circuit board 6. The first sampling position 32 is located on the outer side of the first flexible circuit board 4.

[0043] Optionally, the first crack-stopping groove 42 is in a U-shaped structure with its opening facing the first connecting position 31 and the first sampling position 32 .

[0044] Optionally, the first connection position 31 is welded and fixed to the input end of the first etching line 41, and the area of ​​the first flexible circuit board 4 located inside the first crack prevention groove 42 is used to form a solder pad placement position 7. When the first connection position 31 is welded to the first etching line 41, the solder pad is located in the solder pad placement position 7, so that the welding area is separated from the output end of the first etching line 41, which is beneficial to reduce the risk of tin beads interfering with the first etching line 41.

[0045] The battery cell assembly of the above embodiment is advantageous in absorbing stress through the first crack-stop groove 42 , thereby reducing the risk of cracking of the first flexible circuit board 4 and improving the stability of the overall structure.

[0046] See also Figures 1 to 3 and Figure 6In some optional embodiments, a second crack-stop groove 62 is provided on the second flexible circuit board 6, and at least a portion of the second crack-stop groove 62 is located between the second connection position 51 and the second etched line 61. The second connection position 51 is fixedly connected to the inner edge of the second flexible circuit board 6, where the inner side of the second flexible circuit board 6 refers to the side close to the first flexible circuit board 4. The second sampling position 52 is located on the outer side of the second flexible circuit board 6, where the outer side of the second flexible circuit board 6 refers to the side away from the first flexible circuit board 4.

[0047] Optionally, the second crack-stopping groove 62 is in a U-shaped structure with its opening facing the second connecting position 51 , or in other words, the second crack-stopping groove 62 is in a U-shaped structure with its opening facing away from the second sampling position 52 .

[0048] Optionally, the second connection position 51 is welded and fixed to the input end of the second etching line 61, and the area of ​​the second flexible circuit board 6 located inside the second crack prevention groove 62 is used to form a solder pad placement position 7. When the second connection position 51 is welded to the second etching line 61, the solder pad is located in the solder pad placement position 7, so that the welding area is separated from the output end of the second etching line 61, which is beneficial to reduce the risk of tin beads interfering with the second etching line 61.

[0049] The battery cell assembly of the above embodiment is advantageous in absorbing stress through the second crack-stop groove 62 , thereby reducing the risk of cracking of the second flexible circuit board 6 and improving the stability of the overall structure.

[0050] See also Figures 1 to 6In some optional embodiments, the order of the multiple first etching lines 41 of the first flexible circuit board 4 and the order of the multiple second etching lines 61 of the second flexible circuit board 6 can be selected to be reversed according to needs. For example, in this embodiment, the multiple battery cells are sequentially arranged as V1, V2, V3...V14, the multiple battery cells of the odd-numbered battery cell group are sequentially arranged as V1, V3, V5, V7, V9, V11 and V13, and the multiple battery cells of the even-numbered battery cell group are sequentially arranged as V2, V4, V6, V8, V10, V12 and V14; the even-numbered interface group 21 is located above the odd-numbered interface group 22, and the input ends of the multiple first etching lines 41 are respectively connected to the corresponding first connection positions 31, and the output ends of the multiple first etching lines 41 are respectively bent around the first crack-stop groove 42 and extend along the stacking direction of the multiple battery cells so that the multiple first etching lines 41 are connected to the first connection positions 31. The output ends of an etching line 41 are arranged in a corresponding order to the multiple interfaces 23 of the even-numbered interface group 21, and the output ends of the multiple first etching lines 41 can be plugged into the even-numbered interface group 21; the input ends of the multiple second etching lines 61 are respectively connected to the corresponding second connection positions 51, and the output ends of the multiple second etching lines 61 are respectively bent to bypass the second crack-stop groove 62 and pass between the second connection position 51 and the second sampling position 52 of the corresponding second sampling component 5, so that the output ends of the multiple second etching lines 61 are arranged in a corresponding order to the multiple interfaces 23 of the odd-numbered interface group 22, and the output ends of the multiple second etching lines 61 can be plugged into the odd-numbered interface group 22.

[0051] See also Figures 1 to 7 In some optional embodiments, the present application also provides a battery module, which includes the battery cell assembly in any of the above embodiments.

[0052] See also Figures 1 to 7 In some optional embodiments, the present application also provides a battery pack, which includes the battery cell assembly in any of the above embodiments.

[0053] In the battery cell assembly, battery module and battery pack of the present invention, the first flexible circuit board 4 and the second flexible circuit board 6 are separately arranged, so that the first flexible circuit board 4 and the second flexible circuit board 6 have the flexibility, good manufacturability and low cost of a single-layer flexible circuit board; the output ends of the multiple second etched lines 61 of the second flexible circuit board 6 pass between the second connection position 51 and the second sampling position 52 of the corresponding second sampling member 5, so that the output ends of the multiple second etched lines 61 are arranged correspondingly to the interfaces 23 of the odd-numbered interface group 22. Based on this, the second flexible circuit board 6 and the first flexible circuit board 4 can be matched with the odd-numbered interface group 22 and the even-numbered interface group 21 of the connector 2 to align and plug in, which simplifies the structure and assembly process, has high compatibility, and is conducive to reducing costs.

[0054] Throughout this specification, references to terms such as "this embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A battery cell assembly, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are stacked and arranged to form an odd-numbered battery cell group and an even-numbered battery cell group; A connector having an even-numbered interface group and an odd-numbered interface group distributed in two layers, wherein the multiple interfaces of the even-numbered interface group and the multiple interfaces of the odd-numbered interface group are arranged in descending order or ascending order along a first direction; A plurality of first sampling components, each of the first sampling components having a first connection position and a first sampling position connected to the even-numbered sequence battery cell group; a first flexible circuit board having a plurality of first etching lines, wherein input ends of the plurality of first etching lines are connected to corresponding first connection bits, output ends of the plurality of first etching lines are arranged in the same order as the even-numbered interface group and are connected thereto, and the first connection bits and the first sampling bits are located on the same side of the first etching lines; a plurality of second sampling components, each of the second sampling components having a second connection position and a second sampling position connected to the odd-numbered battery cell group; A second flexible circuit board is provided, wherein the second flexible circuit board has a plurality of second etched lines, wherein input ends of the plurality of second etched lines are connected to corresponding second connection bits, output ends of the plurality of second etched lines are arranged in the same order as and connected to the odd-numbered interface group, and the second sampling element at least spans the corresponding second etched line to distribute the second connection bits and the second sampling bits on both sides of the second etched line.

2. The battery core assembly according to claim 1, characterized in that A first crack-stopping groove is provided on the first flexible circuit board, and at least a portion of the first crack-stopping groove is located between the first connection position and the first etching line.

3. The battery cell assembly according to claim 2, characterized in that: The first crack-stopping groove is in a U-shaped structure with an opening facing the first connecting position and the first sampling position.

4. The battery core assembly according to claim 2, characterized in that The first connection position is fixed to the input end of the first etching line by welding, and the area of ​​the first flexible circuit board located inside the first crack-stopping groove is used to form a pad placement position.

5. The battery core assembly according to claim 1, characterized in that: A second crack-stopping groove is provided on the second flexible circuit board, and at least a portion of the second crack-stopping groove is located between the second connection position and the second etching line.

6. The battery core assembly according to claim 5, characterized in that: The second crack-stopping groove is in a U-shaped structure with its opening facing the second connecting position.

7. The battery cell assembly according to claim 6, characterized in that: The second connection position is fixed to the input end of the second etching line by welding, and the area of ​​the second flexible circuit board located inside the second crack-stopping groove is used to form a pad placement position.

8. The battery core assembly according to claim 1, characterized in that: The first flexible circuit board has a first insulating film, and the thickness of the first insulating film at a portion overlapping with the first sample piece is greater than the thickness of the remaining portions of the first insulating film; the first flexible circuit board has a second insulating film, and the thickness of the second insulating film at a portion overlapping with the second sample piece is greater than the thickness of the remaining portions of the second insulating film.

9. The battery core assembly according to claim 1, characterized in that: The first connection positions of the plurality of first sampling members are located on the same horizontal plane and aligned in the extension direction of the first flexible circuit board; the second connection positions of the plurality of second sampling members are located on the same horizontal plane and aligned in the extension direction of the second flexible circuit board.

10. The battery core assembly according to claim 1 or 9, characterized in that: The first flexible circuit board and the second flexible circuit board both extend along the stacking direction of the multiple battery cells, the first flexible circuit board and the second flexible circuit board are arranged along the length direction of the battery cells, and the first flexible circuit board and the second flexible circuit board are both located between the two poles distributed at both ends of the battery cells.

11. A battery module, characterized in that: Comprising the battery core assembly according to any one of claims 1 to 10.

12. A battery pack, characterized in that: Comprising the battery core assembly according to any one of claims 1 to 10.

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