Sampling device and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a sampling device and a battery pack, and the sampling device comprises a sampling assembly which comprises a first flexible circuit board of which at least one end forms a mounting position along a preset direction, and a connecting assembly which comprises a circuit board, a second flexible circuit board and a connector, the circuit board is arranged at the installation position and connected with the first flexible circuit board, the connector is arranged on the second flexible circuit board, the installation position used for installing the circuit board is located at one end of the first flexible circuit board in the preset direction, the connector can be directly connected with the wire harness at the edge position close to the battery pack, the wire harness does not need to be in contact with the battery, and the battery pack is convenient to use. Besides, the connector is arranged on the second flexible circuit board, the wire outlet direction of the connector is not affected by the circuit board any more and is fixed, the second flexible circuit board can flexibly adjust the connection direction of the connector by changing the orientation of the second flexible circuit board, and the connection mode of the connector is more free.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a sampling device and a battery pack. Background Art

[0002] The information sampling of secondary batteries is a very crucial link in the management and monitoring process of batteries. Information sampling includes voltage sampling, current sampling, temperature sampling, etc. In this application, voltage sampling is taken as an example for illustrative purposes. Voltage sampling plays an extremely important role in ensuring the safe operation of batteries, extending the service life, and improving the efficiency of the overall system. It is the basis for ensuring the reliability of electric vehicles and other equipment using large-capacity battery systems.

[0003] Currently, existing secondary batteries generally use a sampling component arranged above the battery pack for voltage sampling. The sampling component includes a flexible circuit board in contact with the battery and a circuit board connected to the middle position of the flexible circuit board. The flexible circuit board collects the voltage information of the battery, and then connects the battery signal to the main board through the circuit board (slave board) and the communication harness to achieve information interaction. Since there are usually multiple battery packs in the battery pack and the circuit board is located at the middle position of the flexible circuit board, when communicating and connecting between the circuit board and the main board, the communication harness usually needs to span above the battery pack, resulting in the communication harness being easily in contact with and worn by the tabs of the battery pack, posing a safety hazard. Summary of the Utility Model

[0004] In view of this, the utility model provides a sampling device and a battery pack to solve the problem of potential safety hazards existing in the arrangement method of the sampling component of existing power batteries.

[0005] In a first aspect, the utility model provides a sampling device, comprising: a sampling component, including a first flexible circuit board extending along a preset direction, and at least one end of the first flexible circuit board along the preset direction forms an installation position; the preset direction is the arrangement direction of multiple batteries in the battery pack; a connection component, including a circuit board, a second flexible circuit board, and a connector, the circuit board is arranged at the installation position and connected to the first flexible circuit board, one end of the second flexible circuit board is connected to the circuit board, the other end of the second flexible circuit board extends along a direction away from the battery pack, and the connector is arranged at the other end of the second flexible circuit board, and the connector has a connection structure for connecting with a harness.

[0006] Beneficial effects: The first flexible circuit board is arranged along the arrangement direction of the batteries in the battery pack, and the installation position for mounting the circuit board is at one end in the preset direction of the first flexible circuit board. That is, when the sampling component is installed on the battery pack, the circuit board is also located at one end of the battery pack. Moreover, the circuit board is connected to the connector through the second flexible circuit board, and the position where the connector is arranged on the second flexible circuit board is far from the circuit board. That is, the connector is arranged far from the circuit board and the battery pack. At this time, the wire harness can be directly connected to the connector from the edge of the battery pack without crossing the battery pack, avoiding the contact between the wire harness and the battery, and thus effectively avoiding the problems of wire harness wear and signal interference. In addition, in this embodiment, the connector is arranged on the second flexible circuit board, and the outgoing direction of the connector is no longer affected by the circuit board and has a fixed direction. The second flexible circuit board can flexibly adjust the connection direction of the connector by changing its own orientation, making the connection method of the connector more flexible and effectively solving the problem of potential safety hazards existing in the arrangement method of the sampling components of existing power batteries.

[0007] In an alternative embodiment, the second flexible circuit board includes a first connection portion and a second connection portion. The first connection portion is connected to one end of the circuit board far from the middle position of the battery pack, and the second connection portion is connected to the side of the first connection portion far from the circuit board. The connector is located at the second connection portion.

[0008] Beneficial effects: For this form of the second flexible circuit board, since the second connection portion is located on the side of the first connection portion far from the circuit board, this form of the second connection portion can extend the setting position of the connector to a position further away from the battery, so that the contact between the wire harness and the battery close to the circuit board can be further avoided.

[0009] In an alternative embodiment, the first connection portion is connected to the top surface of the circuit board, and / or a support member is further provided at the bottom of the second connection portion.

[0010] Beneficial effects: The connection method is simple and reliable, facilitating processing and manufacturing. The support member can effectively improve the strength of the second connection portion, enabling the connector to be connected to the second connection portion more stably and reliably.

[0011] In an alternative embodiment, the connection component further includes a transformer arranged on the second connection portion. The circuit board is connected to the transformer and the connector in sequence through the second flexible circuit board, and the structural form is simple and reliable.

[0012] In an alternative embodiment, the first flexible circuit board includes a main body portion and a third connection portion. The main body portion extends along the preset direction and an installation position is formed at the top. The preset direction is the length direction of the main body portion. Third connection portions are provided on both sides in the width direction of the main body portion. The third connection portions are bent upward and connected to the top surface of the circuit board.

[0013] Beneficial effects: The first flexible circuit board in this form is more convenient for assembly and connection with the circuit board.

[0014] In an alternative embodiment, the sampling device further includes sampling elements for contacting the battery. A plurality of sampling elements are spaced along both sides in the width direction of the main body portion along a preset direction. Connection points are formed on the third connecting portion corresponding to each sampling element on the corresponding side. The sampling elements are connected to the corresponding connection points to form a sampling circuit, and at least a part of the connection points on the third connecting portion are arranged along the preset direction.

[0015] Beneficial effects: By arranging the connection points in this form, the length of each third connecting portion in the direction perpendicular to the preset direction can be effectively reduced, thereby reducing the size of the third connecting portion, and reducing the manufacturing difficulty and cost.

[0016] In an alternative embodiment, an insulating layer is provided at the bottom of the circuit board and / or on the top of the main body portion.

[0017] Beneficial effects: Compared with an independent insulating component, the insulating layer has a smaller thickness, which can reduce the overall thickness after the circuit board and the first flexible circuit board are assembled while improving the insulating reliability.

[0018] In a second aspect, the present utility model further provides a battery pack, which includes: a box body with an accommodation space inside; a plurality of battery packs arranged in the accommodation space, each battery pack including at least one column of batteries arranged along a preset direction; a battery management system arranged in the box body; the above-mentioned sampling device arranged on the upper side of the battery pack and in contact with the battery, and the battery management system is connected to the connector of the sampling device through a wire harness.

[0019] In an alternative embodiment, a support beam for separating adjacent battery packs is arranged in the accommodation space, the wire harness is arranged along the support beam, and a part of the mounting connector of the second flexible circuit board of the sampling device is located on the support beam.

[0020] Beneficial effects: By arranging the wire harness and the connector in this form, the wire harness can be effectively prevented from directly contacting the battery, which can not only reduce the potential safety hazards and signal interference caused by the interference between the wire harness and the battery, but also improve the cleanliness in the box body.

[0021] In an alternative embodiment, the orientation of the connection structure of the connector of the sampling device is consistent with the extending direction of the support beam.

[0022] Beneficial effects: When the wire harness is arranged and extended along the support beam, it can be directly assembled and connected to the connector without bending, which can improve the reliability of the wire harness connection. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Explosion schematic diagram of a sampling device according to an embodiment of the present utility model;

[0025] Figure 2 For Figure 1 Three-dimensional schematic diagram of the connection assembly of the sampling device shown;

[0026] Figure 3 For Figure 1 Top view of the assembled sampling device shown;

[0027] Figure 4 For Figure 1 Schematic diagram of the connection method of each component of a connection assembly of the sampling device shown;

[0028] Figure 5 For Figure 1 Schematic diagram of the circuit layout of a first flexible circuit board of the sampling device shown;

[0029] Figure 6 Top view of a partial structure of a battery pack according to an embodiment of the present utility model;

[0030] Figure 7 For Figure 6 Enlarged schematic diagram of a part of the sampling device of the battery pack shown;

[0031] Explanation of reference numerals:

[0032] 1. First flexible circuit board; 101. Main body part; 102. Third connection part; 1021. Connection point; 1022. Sampling circuit;

[0033] 2. Circuit board; 201. Insulating layer;

[0034] 3. Second flexible circuit board; 301. First connection part; 302. Second connection part;

[0035] 4. Connector; 5. Support member; 6. Transformer; 7. Sampling member; 801. Box body; 802. Battery; 803. Wiring harness; 804. Support beam. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0037] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 7 , the embodiments of the present utility model will be described.

[0038] In the related art, when a communication harness spans above a battery pack and is connected to a circuit board, since the communication harness will inevitably come into contact with the batteries of the battery pack, during normal operation, there is also a problem of signal interference between the batteries and the communication harness.

[0039] According to an embodiment of the present utility model, on the one hand, a sampling device is provided for information sampling in a battery pack. The battery pack has at least one battery group, and the battery group includes a plurality of batteries 802 arranged along a preset direction. It includes: a sampling component and a connection component. The sampling component includes a first flexible circuit board 1 extending along the preset direction. At least one end of the first flexible circuit board 1 along the preset direction forms a mounting position. The connection component includes a circuit board 2, a second flexible circuit board 3, and a connector 4. The circuit board 2 is disposed at the mounting position and is connected to the first flexible circuit board 1. One end of the second flexible circuit board 3 is connected to the circuit board 2, and the other end of the second flexible circuit board 3 extends along a direction away from the battery group. The connector 4 is disposed at the other end of the second flexible circuit board 3, and the connector 4 has a connection structure for connecting to a harness 803.

[0040] Preferably, the projection of the connector 4 and the battery group in the battery height direction do not coincide. In other possible embodiments, the connector 4 is located above the first battery at the outermost edge of the battery group arranged along the preset direction, and its projection in the battery height direction with the tab on the first battery does not coincide.

[0041] When the sampling device of this embodiment is applied, the first flexible circuit board is arranged along the arrangement direction of the batteries in the battery pack, and the mounting position for mounting the circuit board is at one end in the preset direction of the first flexible circuit board. That is, when the sampling component is mounted on the battery pack, the circuit board is also located at one end of the battery pack. Moreover, the circuit board is connected to the connector through the second flexible circuit board, and the position where the second flexible circuit board sets the connector is far from the circuit board. That is, the connector is arranged far from the circuit board and the battery pack. At this time, the wire harness can be directly connected to the connector from the edge of the battery pack without crossing the battery pack, avoiding the contact between the wire harness and the battery, and thus effectively avoiding the problems of wire harness wear and signal interference. In addition, in this embodiment, the connector is arranged on the second flexible circuit board, and the outgoing line direction of the connector is no longer affected by the circuit board and has a fixed direction. The second flexible circuit board can flexibly adjust the connection direction of the connector by changing its own orientation, making the connection method of the connector more free, and effectively solving the problem of potential safety hazards existing in the arrangement method of the sampling component of the existing power battery.

[0042] Specifically, due to its own characteristics, the position and connection direction of the connector 4 arranged on the circuit board 2 are fixed and cannot be flexibly adjusted. In this embodiment, the connector 4 is transferred to the second flexible circuit board 3. Due to the characteristics of the flexible circuit board, the flexible circuit board can not only conveniently adjust the lines arranged on itself, enabling itself to be connected to the connector 4 in any direction, but also can be bent, and by changing its own orientation, the orientation of the connector 4 on itself can be changed. Therefore, the position and orientation of the connector 4 on the second flexible circuit board 3 can be flexibly and conveniently adjusted according to requirements. When the arrangement mode of the batteries 802 changes or the connection direction and arrangement position of the wire harness 803 change, the connector 4 can change its own position and orientation to match.

[0043] Among them, it should be noted that the preset direction refers to Figure 1 the left - right direction indicated by the arrow in

[0044] In a possible implementation manner, as Figure 2As shown, the second flexible circuit board 3 includes a first connection portion 301 and a second connection portion 302. The first connection portion 301 is connected to one end of the circuit board 2 away from the middle position of the battery pack. The second connection portion 302 is connected to a side of the first connection portion 301 away from the circuit board 2. The connector 4 is located at the second connection portion 302. In the second flexible circuit board 3 of this form, since the second connection portion 302 is located on a side of the first connection portion 301 away from the circuit board 2, the second connection portion 302 can extend the setting position of the connector 4 to a position further away from the battery 802. Therefore, it can further prevent the wire harness 803 from contacting the battery 802 close to the circuit board 2.

[0045] It can be understood that as an alternative implementation, the first connection portion 301 can also be connected to the other side portion of the circuit board 2, as long as it is convenient for the wire harness 803 to be connected to the connector 4.

[0046] Specifically, as Figure 2 shown, the second connection portion 302 extends along a preset direction. The first connection portion 301 is connected to the corresponding position of the circuit board 2 by soldering. In a plane parallel to the first flexible circuit board, the dimension of the first connection portion 301 along a direction perpendicular to the preset direction is larger than the dimension of the second connection portion 302. In the first connection portion 301 of this form, the connection area with the circuit board 2 is larger, which is not only more firmly fixed but also convenient for the circuit layout on the circuit board 2.

[0047] In a possible implementation, the first connection portion 301 is connected to the top surface of the circuit board 2, that is, the circuit board 2 is arranged above the first flexible circuit board, and the first connection portion 301 of the second flexible circuit board is arranged above the circuit board 2. The connection method is simple and reliable, which is convenient for processing and manufacturing.

[0048] In a possible implementation, a support member 5 is further provided at the bottom of the second connection portion 302. The support member 5 can effectively improve the strength of the second connection portion 302, so that the connector 4 can be more stably and reliably connected to the second connection portion 302.

[0049] Among them, it should be noted that the top surface refers to the Figure 1 "upper" side indicated by the arrow in Figure 1 and the bottom refers to the

[0050] "lower" side portion indicated by the arrow in

[0051] Specifically, the specific type and thickness of the support member 5 are not limited. The support member 5 can be a plastic part, a rubber part, a wooden structure, etc. The size and thickness of the support member 5 can be flexibly selected according to the assembly requirements, as long as it can improve the support strength of the second connection portion 302.

[0051] In a possible implementation, as Figure 2 and Figure 3As shown, the connection component further includes a transformer 6 disposed on the second connection portion 302. The circuit board 2 is sequentially connected to the transformer 6 and the connector 4 through the second flexible circuit board 3, and the structural form is simple and reliable.

[0052] Specifically, the circuit board 2 further includes a chip. The sampling lines are aggregated into the chip (not shown in the figure) of the circuit board 2. Multiple connection positions are provided on the chip for connecting to the pins of the transformer, and the connection positions can be in the form of pads. Specifically, in one alternative embodiment, the first connection portion 301 is connected to the circuit board 2 to form a plurality of pads, and the pads are connected to the input ends of the corresponding transformer 6. The output end of the transformer 6 is connected to the connector 4 through incoming and outgoing wires, and the pads, the transformer 6, and the connector 4 are connected in series in sequence. The connector will be subsequently connected to the main board to achieve the acquisition and aggregation of voltage information.

[0053] Preferably, as Figure 4 shown, the circuit board 2 is connected to the corresponding two transformers 6 through six pads, and the two transformers 6 are connected to the connector 4 through four daisy-chain incoming and outgoing wires.

[0054] Among them, the distance between two adjacent pads formed by the connection of the circuit board 2 and the first connection portion 301 is the same. In this form, the connection component is easier to achieve mass production platformization and can meet the use of various projects with different battery 802 layouts.

[0055] In one possible embodiment, as Figure 1 shown, the first flexible circuit board 1 includes a main body portion 101 and a third connection portion 102. The main body portion 101 extends along a preset direction and an installation position is formed at the top. The preset direction is the length direction of the main body portion 101. The third connection portions 102 are provided on both sides of the width direction of the main body portion 101. The third connection portions 102 are bent upward and connected to the top surface of the circuit board 2. In this form, the first flexible circuit board 1 is more convenient for assembling and connecting with the circuit board 2.

[0056] Specifically, the third connection portion 102 and the circuit board 2 are soldered by reflow soldering.

[0057] In one possible embodiment, as Figure 3 and Figure 5As shown, the sampling device further includes a sampling member 7 for contacting the battery 802. A plurality of sampling members 7 are arranged at intervals along a preset direction on both sides in the width direction of the main body portion 101. A connection point 1021 is formed on the third connection portion 102 corresponding to each sampling member 7 on one side. The sampling member 7 is connected to the corresponding connection point 1021 to form a sampling circuit 1022. At least a part of the connection points 1021 on the third connection portion 102 are arranged along the preset direction. By arranging the connection points 1021 in this form, the length of each third connection portion 102 in the direction perpendicular to the preset direction can be effectively reduced, thereby reducing the size of the third connection portion 102 and lowering the manufacturing difficulty and cost.

[0058] Among them, it should be noted that Figure 5 The layout manner of the circuits on the shown circuit board 2 is only a schematic illustration of one of the layout manners, and it is not strictly required to be arranged as Figure 5 shown, and it can be flexibly adjusted according to actual requirements.

[0059] Specifically, since a plurality of sampling members 7 ultimately need to be aggregated to the corresponding third connection portion 102 and connected to the circuit board 2, the connection points 1021 on a single third connection portion 102 in the related art are usually arranged in sequence along the direction perpendicular to the preset direction. Since there are relatively many sampling circuits 1022, a relatively long distance is required when arranging the connection points 1021 in this form, resulting in a relatively long size of the third connection portion 102 in the direction perpendicular to the preset direction. Therefore, a circuit board 2 with a larger size needs to be used to connect thereto.

[0060] In this embodiment, the connection points 1021 are arranged along the preset direction. When using a third connection portion 102 with the same size as in the related art, the layout manner of the connection points 1021 in this embodiment can arrange more connection points 1021 on the third connection portion 102. In addition, the layout manner of the connection points 1021 in this embodiment can also reduce the size of the third connection portion 102 in the direction perpendicular to the preset direction under the condition of the same number of connection points 1021, so that a circuit board 2 with a smaller size can be used to connect thereto.

[0061] In a possible implementation manner, an insulating layer 201 is provided at the bottom of the circuit board 2 and / or the top of the main body portion 101. The insulating layer 201 has a smaller thickness compared to an independent insulating component, and can reduce the overall thickness after the circuit board 2 and the first flexible circuit board 1 are assembled while improving the insulation reliability.

[0062] Specifically, the insulating layer 201 can also be fixed to the bottom of the circuit board 2 or fixed to the top of the main body portion 101.

[0063] In addition, the insulating layer 201 can also be a double-sided adhesive member. The insulating layer 201 is adhesively connected to the bottom of the circuit board 2 and the top of the main body 101 respectively. The insulating layer 201 in this form can also play a role in fixing the relative positions of the circuit board 2 and the main body 101.

[0064] According to an embodiment of the present invention, on the other hand, a battery pack is provided, which includes: a box body 801, a plurality of battery packs, a battery management system, and the above-mentioned sampling device. The box body 801 has an accommodation space inside. A plurality of battery packs are arranged in the accommodation space. Each battery pack includes at least one row of batteries 802 arranged along a preset direction. The battery management system is arranged in the box body 801. The sampling device is arranged on the upper side of the battery pack and is in contact with the battery 802. The battery management system is connected to the connector 4 of the sampling device through a wire harness 803.

[0065] In a possible implementation manner, as Figure 6 and Figure 7 shown, a support beam 804 for separating adjacent battery packs is arranged in the accommodation space. The wire harness 803 is arranged along the support beam 804. The part of the mounting connector 4 of the second flexible circuit board 3 of the sampling device is located on the support beam 804. The wire harness 803 and the connector 4 arranged in this form can effectively prevent the wire harness 803 from directly contacting the battery 802, which can not only reduce the safety hazards and signal interference caused by the interference between the wire harness 803 and the battery 802, but also improve the cleanliness in the box body 801.

[0066] In a possible implementation manner, as Figure 6 and Figure 7 shown, a support beam 804 is arranged between two adjacent battery packs along the preset direction. The connection components of the sampling devices arranged on each battery pack are all arranged close to the support beam 804, that is, the two sampling devices are arranged oppositely. The parts of the mounting connectors 4 of the second flexible circuit boards 3 of the two sampling devices are both located on the support beam 804. The corresponding parts of the second flexible circuit boards 3 of the two sampling devices are detachably connected to the support beam 804 through a connecting member.

[0067] Among them, the connecting member can be flexibly selected according to requirements, and can be an adhesive, a fastener, etc. The connecting member is preferably a cable tie, which has good insulation performance and is convenient for fixing operations.

[0068] In a possible implementation manner, as Figure 7 shown, the orientation of the connection structure of the connector 4 of the sampling device is consistent with the extending direction of the support beam 804. When the wire harness 803 is arranged and extended along the support beam 804, it can be directly assembled and connected to the connector 4 without bending, which can improve the reliability of the connection of the wire harness 803.

[0069] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A sampling device, characterized in that, Comprising: A sampling component, including a first flexible circuit board (1) extending along a preset direction, at least one end of the first flexible circuit board (1) along the preset direction forms a mounting position, and the preset direction is the arrangement direction of a plurality of batteries (802) in the battery pack; A connection component, including a circuit board (2), a second flexible circuit board (3), and a connector (4), the circuit board (2) is disposed at the mounting position and connected to the first flexible circuit board (1), one end of the second flexible circuit board (3) is connected to the circuit board (2), the other end of the second flexible circuit board (3) extends along a direction away from the battery pack, the connector (4) is disposed at the other end of the second flexible circuit board (3), and the connector (4) has a connection structure for connecting to a wire harness (803).

2. The sampling device according to claim 1, characterized in that The second flexible circuit board (3) includes a first connection portion (301) and a second connection portion (302), the first connection portion (301) is connected to one end of the circuit board (2) away from the middle position of the battery pack, the second connection portion (302) is connected to a side of the first connection portion (301) away from the circuit board (2), and the connector (4) is located at the second connection portion (302).

3. The sampling device according to claim 2, wherein, The first connection portion (301) is connected to the top surface of the circuit board (2), and / or a support member (5) is further provided at the bottom of the second connection portion (302).

4. The sampling device according to claim 2, wherein The connection component further includes a transformer (6) disposed on the second connection portion (302), and the circuit board (2) is connected to the transformer (6) and the connector (4) in sequence through the second flexible circuit board (3).

5. The sampling device according to any one of claims 1 to 4, characterized in that The first flexible circuit board (1) includes a main body portion (101) and a third connection portion (102), the main body portion (101) extends along the preset direction and the mounting position is formed at the top, the preset direction is the length direction of the main body portion (101), the third connection portions (102) are provided on both sides of the main body portion (101) in the width direction, the third connection portions (102) are bent upward and connected to the top surface of the circuit board (2).

6. The sampling device according to claim 5, characterized in that, The sampling device further includes a sampling member (7) for contacting the battery (802), a plurality of the sampling members (7) are spaced apart along the preset direction on both sides of the main body portion (101) in the width direction, a connection point (1021) is formed corresponding to each of the sampling members (7) on the corresponding side of the third connection portion (102), the sampling member (7) is connected to the corresponding connection point (1021) to form a sampling circuit (1022), and at least a part of the connection points (1021) on the third connection portion (102) are arranged along the preset direction.

7. The sampling device according to claim 5, characterized in that An insulating layer (201) is provided at the bottom of the circuit board (2) and / or the top of the main body portion (101).

8. A battery pack, characterized in that, Comprising: A box body (801) having an accommodation space inside; A plurality of battery packs, disposed in the accommodation space, each battery pack includes at least one column of batteries (802) arranged along a preset direction; A battery management system is disposed in the box body (801); The sampling device according to any one of claims 1 to 7 is disposed on the upper side of the battery pack and in contact with the battery (802), and the battery management system is connected to the connector (4) of the sampling device through a wire harness (803).

9. The battery pack according to claim 8, wherein, A support beam (804) for separating adjacent battery packs is disposed in the accommodation space, the wire harness (803) is arranged along the support beam (804), and the portion of the second flexible circuit board (3) of the sampling device where the connector (4) is installed is located on the support beam (804).

10. The battery pack according to claim 9, characterized in that, The orientation of the connection structure of the connector (4) of the sampling device is consistent with the extending direction of the support beam (804).

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