Battery modules, battery packs, and vehicles

Abstract

A battery module, a battery pack, and a vehicle, the battery module includes a cell assembly and a sampling assembly, the cell assembly has poles at both ends located opposite to the cells, the cells are sequentially connected in series via a connection sheet, and on the positive electrode side of the cell assembly, a connection sheet connected to the positive electrode of each cell is electrically connected to a housing of the cell. The sample assembly electrically connects the housing on the negative electrode side of the cell assembly and the connection sheet.

Description

[[Technical Field]]

[0001] The present application claims the priority of the Chinese patent application with the application number 202220482834.0 and the title of the invention "Battery Module, Battery Pack and Vehicle" filed with the China National Intellectual Property Administration on March 7, 2022, the entire content of which is incorporated into the present application by reference.

[0002] The present application relates to the technical field of battery structures, and specifically relates to a battery module, a battery pack and a vehicle. [[Background Art]]

[0003] Currently, lithium-ion batteries have advantages such as high operating voltage, high specific energy, long cycle life and no environmental pollution. They are not only widely used in mobile communication devices and portable electronic devices, but also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles and electric tools, and are currently the main development direction of various large battery manufacturers. A plurality of cells is generally provided inside a lithium-ion battery. For cells provided with pole posts at both ends, sampling needs to be performed at both ends of the cell, which increases the complexity of the sampling structure and the structural cost. In addition, since the housing of the cell is generally uncharged or has a low voltage, the electrolyte in the cell is prone to corrode the housing and components on the housing, which easily causes the problem of liquid leakage of the cell and affects the use safety of the lithium-ion battery.

[0004] Therefore, in order to improve the overall safety performance of lithium-ion batteries, it is necessary to improve the structure of lithium-ion batteries. [[Summary of the Invention]]

[0005] An object of an embodiment of the present application is to provide a new technical solution of a battery module, a battery pack and a vehicle.

[0006] According to a first aspect of the present application, a battery module is provided, the battery module comprising a cell assembly and a sampling assembly, The cell assembly comprises a plurality of cells, each of which has poles at opposite ends, and the plurality of cells are connected in series sequentially via connecting sheets, each cell comprises a housing, and on the positive side of the cell assembly, the connecting sheet connected to the positive pole of each cell is electrically connected to the housing of the corresponding cell. The sampling assembly electrically connects the housing on the negative electrode side of the cell assembly to the connecting sheet.

[0007] One embodiment The sampling assembly includes a sampling unit, the sampling unit includes a sampling terminal and an output terminal, and the sampling terminal is electrically connected to the housing and / or the connection sheet.

[0008] One embodiment A welded portion is provided in the housing, and the sampling portion is electrically connected to the welded portion via the sampling terminal.

[0009] One embodiment The sampling terminal includes a first sampling terminal and a second sampling terminal, the first sampling terminal being electrically connected to the weld and one of the connecting sheets, and the second sampling terminal being electrically connected to the other of the weld.

[0010] One embodiment The first sampling terminal includes a first connection segment and a second connection segment, the sampling unit is electrically connected to the weld via the first connection segment, and the connection sheet is electrically connected to the weld via the second connection segment.

[0011] One embodimentThe first sampling terminal is used to enable the collection of information within the cell by the sampling unit via the welded portion and to apply a voltage to the housing via the connecting sheet, and the second sampling terminal is used to enable the collection of information within the cell by the sampling unit via the welded portion.

[0012] One embodiment The sampling assembly includes a protective section, one end of which is electrically connected to the sampling terminal and the welded section, and the other end of which is connected to the connecting sheet.

[0013] One embodiment The sampling unit and the protection unit are at least one of a flexible circuit board and a printed circuit board.

[0014] One embodiment The sampling section (4) and the protective section (5) are integrally molded. One embodiment The sampling unit is provided on the top side of the cell assembly, and the protective unit is provided parallel to the sampling unit.

[0015] One embodiment Therefore, the sampling unit and the protection unit are perpendicular to each other.

[0016] One embodiment The protective portion is provided on the side of the cell assembly where the pole column is located.

[0017] One embodiment The sampling unit is a first flexible connecting member, and the first flexible connecting member is inserted into and engaged with the sampler.

[0018] One embodiment The protective portion is a second flexible connecting member, and a protective circuit connecting the connecting sheet and the housing is provided within the second flexible connecting member.

[0019] One embodiment In this aspect, the protection circuit comprises a fuse box or a fuse.

[0020] One embodiment In this aspect, the battery module further comprises a frame, a plurality of the cells are arranged side by side in the frame.

[0021] According to a second aspect of the present application, a battery pack comprising the battery module according to the first aspect is provided.

[0022] According to a third aspect of the present application, a vehicle comprising the battery module according to the first aspect or the battery pack according to the second aspect is provided.

[0023] The technical effects of the embodiments of the present application are as follows.

[0024] An embodiment of the present application provides a battery module comprising a cell assembly and a sampling assembly. After a constant voltage is applied to the housing via the sampling assembly, that is, by applying a constant voltage to the housing, damage caused by electrolyte in the cells infiltrating the housing can be reduced, the integrity and stability of the housing can be ensured, and the use safety of the battery module can be improved. In addition, the sampling part may adopt single-sided sampling, which simplifies the structure of the sampler and reduces the design cost of the sampler.

[0025] Other features and advantages of the present application will become apparent from the following detailed description of embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. [Figure 1] It is a perspective view of the battery module according to an embodiment of the present application. [Figure 2] This is an exploded view of a battery module according to an embodiment of the present invention. [Figure 3] This is a schematic diagram 1 of one end of a battery module according to an embodiment of the present invention. [Figure 4] This is a schematic diagram 1 of the other end of the battery module according to an embodiment of the present invention. [Figure 5] This is a schematic diagram 2 of one end of a battery module according to an embodiment of the present invention. [Figure 6] This is a schematic diagram 2 of the other end of the battery module according to an embodiment of the present invention. [Figure 7] This is a schematic diagram 1 of the combination of the sampling unit and the protection unit of the battery module according to an embodiment of the present invention. [Figure 8] This is a schematic diagram 2 of the combination of the sampling unit and the protection unit of the battery module according to an embodiment of the present invention. [Figure 9] Figure 3 is a schematic diagram of the combination of the sampling unit and the protection unit of the battery module according to an embodiment of the present invention. [Figure 10] Figure 4 is a schematic diagram of the combination of the sampling unit and the protection unit of the battery module according to an embodiment of the present invention. [Figure 11] This is a schematic diagram of a battery pack according to an embodiment of the present application. [Figure 12] This is a schematic diagram of a vehicle according to an embodiment of the present invention. [Modes for carrying out the invention]

[0027] Hereinafter, each exemplary embodiment of this application will be described in detail with reference to the drawings. It should be noted that, unless otherwise specifically stated, the relative arrangements of components and steps, digital expressions, and numerical values ​​described in these embodiments do not limit the scope of this application.

[0028] The following description of at least one exemplary embodiment is for illustrative purposes only and does not limit this application or its applications or uses.

[0029] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as illustrative only, not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] In the following drawings, the same reference numerals and letters indicate the same item; therefore, if an item is defined in one drawing, it is not necessary to explain it further in the following drawings.

[0032] Referring to Figures 1-10, embodiments of the present application provide a battery module 100 which may be used as a power battery for an electric vehicle. The battery module 100 includes a cell assembly and a sampling assembly. To ensure stable performance of the battery module 100, the sampling assembly is used to sample cell information from the cell assembly, for example, the temperature, pressure, electrolyte volume of the cell assembly.

[0033] As shown in Figures 2 and 3, the cell assembly includes a plurality of cells 2, and poles are provided at both ends located opposite each other, and as shown in Figure 1, in order to facilitate the series connection of the plurality of cells 2, one end of the plurality of cells 2 may have alternating positive and negative poles, and the other end of the plurality of cells 2 may similarly have alternating positive and negative poles.

[0034] As shown in Figures 1-3, the multiple cells 2 are connected in series sequentially via connecting sheets 3, with poles provided at both ends opposite each other, i.e., the multiple connecting sheets 3 are provided at both ends of the cell assembly. Each cell 2 includes a housing 21, and the housing 21 may be provided with an explosion-proof valve 22. Continuing to refer to Figure 4, on the positive side P of the cell assembly, the connecting sheet 3 connected to the positive electrode of each cell 2 is electrically connected to the housing 21 of the corresponding cell 2, specifically, the portion of each connecting sheet 3 connected to the positive electrode of the cell 2 is electrically connected to the housing 21 of the corresponding cell 2. The connecting sheets 3 apply a constant voltage to the housing 21 of the cell 2, i.e., apply a constant voltage to the housing 21 and the explosion-proof valve 22, thereby raising the potential of the housing 21 and the explosion-proof valve 22 and protecting the housing 21 and the explosion-proof valve 22.

[0035] Referring to Figures 2 and 3, the sampling assembly electrically connects the housing 21 on the negative electrode side N of the cell assembly to the connecting sheet 3, thereby allowing the sampling unit 4 to collect cell information such as the temperature, pressure, and electrolyte volume of each cell 2, and then form potential protection on the housing 21. Specifically, the multiple cells 2 are sequentially connected in series by the connecting sheet 3, and then can form a total positive electrode column and a total negative electrode column that are directly connected to the outside. The side where the total positive electrode column is located is the positive electrode side P of the cell assembly, and the side where the total negative electrode column is located is the negative electrode side N of the cell assembly.

[0036] Specifically, the explosion-proof valve 22 may be made of thin aluminum, and by applying a constant voltage to the housing 21 via the connecting sheet 3, that is, by applying a constant voltage to the explosion-proof valve 22 in the housing 21, damage caused by the electrolyte in the cell 2 seeping into the housing 21 and the explosion-proof valve 22 can be reduced, ensuring the integrity and stability of the housing 21 and the explosion-proof valve 22, and improving the safety of use of the battery module 100. In addition, the sampling assembly can also sample on one side, that is, it can be provided on only one side of the cell component, simplifying the structure of the sampling assembly and reducing the design cost of the sampling assembly.

[0037] The battery module 100 provided in this embodiment of the present application includes a cell assembly and a sampling assembly, the cell assembly including a plurality of cells 2, the cell 2 having poles at both ends located opposite each other, and the plurality of cells 2 are sequentially connected in series via connecting sheets 3. The cells 2 include a housing 21, the connecting sheet 3 connected to the positive electrode of each cell 2 is electrically connected to the housing 21 of the corresponding cell 2. After a constant voltage is applied to the housing 21 via the sampling assembly, i.e., by applying a constant voltage to the housing 21, damage caused by electrolyte in the cells 2 seeping into the housing 21 can be reduced, ensuring the integrity and stability of the housing 21 and improving the safety of use of the battery module 100. Furthermore, because the housing 21 of the cells 2 is charged, the sampling assembly can also sample from one side, simplifying the structure of the sampling assembly and reducing the design cost of the sampling assembly.

[0038] One embodiment As shown in Figures 1-3, the sampling assembly includes a sampling unit 4, the sampling unit 4 includes a sampling terminal 41 and an output terminal 42, and the sampling terminal 41 is electrically connected to the housing 21 and / or the connection sheet 3.

[0039] Specifically, the sampling unit 4 is electrically connected to the housing 21 via the sampling terminal 41, and the output terminal 42 is connected to an external sampling device. This allows the sampling unit 4 to collect cell information such as the temperature, pressure, and electrolyte volume of the cell 2, transmit it to the external sampling device, and further process and monitor the information to ensure the operational stability of the battery module 100. When the sampling terminal 41 is electrically connected to the connection sheet 3, a voltage can be applied to the housing 21 via the connection sheet 3, ensuring the integrity and stability of the housing 21.

[0040] One embodiment A welded portion 7 is provided in the housing 21, and the sampling unit 4 is electrically connected to the welded portion 7 via the sampling terminal 41.

[0041] Specifically, one end of the sampling terminal 41 may be superimposed and connected to the sampling body of the sampling unit 4, and the other end or intermediate position of the sampling terminal 41 may be welded to the welded portion 7 of the housing 21. Specifically, the welded portion 7 may be a welding point provided on the housing 21 to facilitate welding of the sampling terminal 41 to the housing 21. The welded portion 7 enables the sampling terminal 41 to achieve electrical connection between the housing 21 and the sampling unit 4. Furthermore, the sampling terminal 41 has features such as a fast welding speed, small thermal deformation, and high density, which ensures that the sampling unit 4 effectively collects cell information such as the temperature, pressure, and electrolyte volume of each cell 2.

[0042] One embodimentAs shown in Figures 3-6, the sampling terminal 41 includes a first sampling terminal 411 and a second sampling terminal 412, the first sampling terminal 411 being electrically connected to the welded portion 7 and the connecting sheet 3, and the second sampling terminal 412 being electrically connected to the welded portion 7.

[0043] When the sampling assembly electrically connects the housing 21 on the negative electrode side N of the cell assembly to the connecting sheet 3, both the welded portion 7 and the connecting sheet 3 can be electrically connected by the first sampling terminal 411. In other words, the first sampling terminal 411 enables the collection of information within the cell 2 by the sampling unit 4 via the welded portion 7, and also enables the application of voltage to the housing 21 via the connecting sheet 3. If it is necessary for some of the sampling terminals of the sampling terminal 41 to collect information only within the cell 2, only the second sampling terminal 412 may be electrically connected to the welded portion 7. The second sampling terminal 412 enables the collection of information within the cell 2 by the sampling unit 4 via the welded portion 7, and simplifies the structure of the sampling terminal 41. The connecting sheet 3 and the housing 21 are electrically connected by an assembly equipped with a protective circuit.

[0044] One embodiment The first sampling terminal 411 includes a first connection segment 411a and a second connection segment 411b, the sampling unit 4 is electrically connected to the welded portion 7 via the first connection segment 411a, and the connection sheet 3 is electrically connected to the welded portion 7 via the second connection segment 411b.

[0045] Specifically, when the sampling unit 4 samples the cell 2 via the first connection segment 411a, the connection sheet 3 can apply voltage to the housing 21 via the second connection segment 411b, and a safety circuit can be provided in the second connection segment 411b. The first connection segment 411a and the second connection segment 411b are integrally molded to form the first sampling terminal 411. One end of the first sampling terminal 411 is connected to the welded portion 7, the other end is connected to the connection sheet 3, and the intermediate position of the first sampling terminal 411 can be welded to the housing 21 of the cell 2. In other words, the central part of the first sampling terminal 411 can simultaneously apply voltage to the housing 21 of the cell 2 and perform sampling by the sampling unit 4 with only one welding operation, simplifying the structure and production time cost of the first sampling terminal 411.

[0046] One embodiment As shown in Figures 2-7, the sampling assembly includes a protective section 5, one end of which is electrically connected to the sampling terminal 41 and the welded section 7, and the other end of which is connected to the connecting sheet 3.

[0047] Specifically, since the housing 21 is connected to the poles of the cell 2 after a constant voltage is applied to it via the connecting sheet 3, the protective part 5 can be provided between the connecting sheet 3 and the welded part 7 of the housing 21 to prevent the connecting sheet 3 from damaging the housing 21 when the voltage is too high. Specifically, the protective part 5 may be a fuse box (fuse protection circuit) or a protection circuit such as a fuse, and it ensures the stability of the voltage in the housing 21.

[0048] One embodimentThe sampling unit 4 and the protection unit 5 are at least one of a flexible circuit board and a printed circuit board. Furthermore, as shown in Figures 2-5, the sampling unit 4 and the protection unit 5 can be integrally assembled.

[0049] Specifically, the assembly may have an assembly base, for example, the assembly base may be a PCB (Printed Circuit Board) base or an FPC (Flexible Printed Circuit) base, and both the sampling unit 4 and the protection unit 5 can be molded onto the assembly base to improve the integration and compactness of the sampling unit 4 and the protection unit 5.

[0050] One embodiment The sampling unit 4 and the protection unit 5 are either a PCB or a double-sided FPC. As shown in Figures 2 and 3, when the sampling unit 4 and the protection unit 5 are PCBs, both the sampling unit 4 and the protection unit 5 may be molded onto a PCB substrate, thereby forming a PCB, and the PCB may be an integrated BIC (Battery Information Collector). The installation of the PCB assembly not only guarantees the performance of the sampling unit 4 and the protection unit 5, but also reduces the influence of electromagnetic interference on the sampling unit 4 and the protection unit 5 by utilizing the good EMC (electromagnetic interference resistance) performance of the PCB. When the sampling unit 4 and the protection unit 5 are FPCs, as shown in Figures 4-9, the sampling unit 4 and the protection unit 5 may each be two independent FPCs, and as shown in Figure 7, the circuit of the sampling unit 4 may be etched onto one side of the FPC substrate, and as shown in Figure 8, the circuit of the protection unit 5 may be etched onto the other side of the FPC substrate, thereby forming the double-sided FPC as shown in Figure 9.

[0051] One embodimentAs shown in Figures 1-3, the sampling unit 4 is provided on the top side of the cell assembly.

[0052] Specifically, pole posts 23 are provided at both ends opposite to the cell 2, the cell 2 is placed horizontally within the frame 1, and the top side of the cell assembly has a flat top surface. Therefore, when the sampling section 4 is provided on the top side of the cell assembly, the width dimension of the sampling section 4 (i.e., the dimension along the extending direction of the cell 2) is not affected by structures such as pole posts on the sides of the cell 2, and the height of the sides of the cell 2 is not affected by the dimensions of the sampling section 4. The width dimension of the sampling section 4 can be flexibly adjusted. For example, the width dimension of the sampling section 4 can be widened, as shown in Figure 8, where the sampling section 4 is different from the sampling section 4 in Figure 7, and in Figure 10, where the sampling section 4 is different from the sampling section 4 in Figure 9, to fill the space necessary for wiring in the sampling section 4.

[0053] Furthermore, the sampling unit 4 does not need to overlap with the high-voltage circuit at the end of the cell 2, thereby reducing the risk of the sampling unit 4 being subjected to EMC (electromagnetic interference).

[0054] One embodiment Referring to Figures 1-3, 7, and 8, the protective portion 5 is provided at the end of the cell assembly where the pole column 23 is located.

[0055] Specifically, pole posts 23 are provided at both ends opposite to the cell 2, that is, multiple connecting sheets 3 are provided at both ends of the cell assembly. To facilitate the installation of the protective part 5 between the connecting sheet 3 and the housing 21, the protective part 5 may be installed at the end of the cell assembly. Since the sampling part 4 is installed at the top of the cell assembly, the sampling part 4 and the protective part 5 can form a structure perpendicular to each other, and the protective part 5 and the connecting sheet 3 are located at the same end of the cell 2, so that the connecting sheet 3 can be easily connected to the housing at the corresponding end of the cell 2 via the protective part 5, and the structure of the protective part 5 can be simplified.

[0056] One embodiment As shown in Figures 9 and 10, the protective unit 5 is installed parallel to the sampling unit 4.

[0057] Specifically, since the connection sheet 3 is directly connected to the pole pole 23 of the cell 2, the protection unit 5 can be installed parallel to the sampling unit 4 to avoid interference between the connection sheet 3 and the protection unit 5 when the voltage is too high. Since the sampling unit 4 is installed on the top side of the cell assembly, that is, the protection unit 5 may be installed on the top side of the cell assembly or in a space higher than the cell assembly, ensuring that the performance of the protection unit 5 is stable.

[0058] One embodiment As shown in Figure 1, the sampling unit 4 is a first flexible connecting member, and the first flexible connecting member is inserted into and engaged with the sampler 6 via an insertion connecting member.

[0059] Specifically, the first flexible connecting member may be an FPC (Flexible Printed Circuit), an FFC (Flexible Flat Cable), or an FDC (Flexible Conductive Cable), and the width of the first flexible connecting member is adjustable. When the first flexible connector is electrically connected to the housing 21 of each cell 2, after being inserted into and engaged with the sampler 6 via the insertion connecting member, the sampler 6 can process the cell information collected by the first flexible connector from each cell 2. Because the first flexible connecting member has a flexible structure, the position and extension direction of the first flexible connecting member can be flexibly set, improving the structural flexibility of the sampling unit 4.

[0060] One embodiment As shown in Figures 1 and 2, the protective part 5 is a second flexible connecting member, and a protective circuit connecting the connecting sheet 3 and the housing 21 is provided within the second flexible connecting member.

[0061] Specifically, the second flexible connecting member may be an FPC (Flexible Printed Circuit), an FFC (Flexible Flat Cable), or an FDC (Flexible Conductive Cable), one end of the second flexible connecting member may be electrically connected to the connecting sheet 3, and the other end of the second flexible connecting member may be connected to the housing 21 of the cell 2 via the connecting sheet 3 to apply a constant voltage to the housing 21. To avoid damaging the housing 21 when the voltage of the connecting sheet 3 is too high, a protective circuit connecting the connecting sheet 3 and the housing 21 may be provided within the second flexible connecting member, and the protective circuit may be a fuse box (fuse protection circuit) or a fuse, ensuring the structural integrity of the housing 21.

[0062] One embodiment The battery module 100 further includes a frame 1, and the plurality of cells 2 are arranged side by side within the frame 1.

[0063] Specifically, as shown in Figure 2, the frame 1 may include a lower plate 11, an upper plate 12, and a side plate 13 connected between the lower plate 11 and the upper plate 12. The lower plate 11, upper plate 12, and side plate 13 form a housing cavity 14 by bonding, welding, or screw connection, and the cell assembly is provided in the housing cavity 14 within the frame 1, and the frame 1 can provide support and protection to the cell assembly.

[0064] Referring to Figure 11, Figure 11 is a schematic diagram of a battery pack according to one embodiment of the present application. The embodiment of the present application further provides a battery pack 200 including at least one of the battery modules 100.

[0065] Specifically, the battery pack 200 may be used as a power battery for a vehicle, and the battery module 100 includes a cell assembly and a sampling assembly, the cell assembly includes a plurality of cells 2, poles are provided at both ends located opposite each other, and the plurality of cells 2 are sequentially connected in series via connecting sheets 3. The cells 2 include a housing 21, and the connecting sheet 3 connected to the positive electrode of each cell 2 is electrically connected to the housing 21 of the corresponding cell 2. After a constant voltage is applied to the housing 21 via the sampling assembly, that is, by applying a constant voltage to the housing 21, damage caused by electrolyte in the cells 2 seeping into the housing 21 can be reduced, ensuring the integrity and stability of the housing 21 and improving the safety of use of the battery pack 200.

[0066] Figure 12 is a schematic diagram of a vehicle according to an embodiment of the present application. The embodiment of the present application further provides a vehicle 300, the vehicle including the battery pack 200, the battery pack 200 having at least one of the battery modules 100.

[0067] Specifically, the battery module 100 of the vehicle 300 includes a cell assembly and a sampling assembly, the cell assembly includes a plurality of cells 2, each cell 2 having poles at both ends opposite each other, and the plurality of cells 2 are sequentially connected in series via connecting sheets 3. The cells 2 include a housing 21, and the connecting sheet 3 connected to the positive electrode of each cell 2 is electrically connected to the housing 21 of the corresponding cell 2. After a constant voltage is applied to the housing 21 via the sampling assembly, that is, by applying a constant voltage to the housing 21, damage caused by electrolyte in the cells 2 seeping into the housing 21 can be reduced, ensuring the integrity and stability of the housing 21 and improving the safety of use of the vehicle 300.

[0068] While some specific embodiments of this application have been described in detail by means of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the claims. [Explanation of Symbols]

[0069] 1. Frame 11, lower plate 12. Top board 13. Side panel 14. Containment Cavity 2, Cell 21. Housing 22. Explosion-proof valve 23, pole pillar 3. Connection sheet 4. Sampling section 41. Sampling terminal 411, First sampling terminal 411a, First connection segment 411b, Second connection segment 412, Second sampling terminal 42. Output terminals 5, protection department 6. Sampler 7. Welded parts 100, Battery Module 200, battery pack 300, Vehicles P, positive side of the cell assembly N, the negative electrode side of the cell assembly.

Claims

1. A battery module (100) including a cell assembly and a sampling assembly, The cell assembly comprises a plurality of cells (2), each of which has pole posts (23) at opposite ends, and the plurality of cells (2) are connected in series sequentially via connecting sheets (3), and each cell (2) comprises a housing (21) and an explosion-proof valve (22) provided in the housing (21), and on the positive side (P) of the cell assembly, the connecting sheet (3) connected to the positive pole of each cell (2) is electrically connected to the housing (21) and explosion-proof valve (22) of the corresponding cell (2). The sampling assembly electrically connects the housing (21) on the negative electrode side (N) of the cell assembly to the connecting sheet (3). The sampling assembly includes a sampling unit (4) and a protection unit (5), The sampling unit (4) includes a sampling terminal (41) and an output terminal (42), and the sampling terminal (41) is electrically connected to the housing (21) and / or the connection sheet (3). A welded portion (7) is provided in the housing (21), and the sampling portion (4) is electrically connected to the welded portion (7) via the sampling terminal (41). One end of the protective part (5) is electrically connected to the sampling terminal (41) and the welded part (7), and the other end of the protective part (5) is connected to the connecting sheet (3). The battery module (100) is characterized in that the sampling unit (4) is provided on the top side of the cell assembly, and the protection unit (5) is provided parallel to the sampling unit (4).

2. The battery module (100) according to claim 1, wherein the sampling terminal (41) includes a first sampling terminal (411) and a second sampling terminal (412), the first sampling terminal (411) is electrically connected to one of the welded parts (7) and the connecting sheet (3), and the second sampling terminal (412) is electrically connected to the other welded part (7).

3. The battery module (100) according to claim 2, characterized in that the first sampling terminal (411) includes a first connection segment (411a) and a second connection segment (411b), the sampling unit (4) is electrically connected to the welded portion (7) via the first connection segment (411a), and the connection sheet (3) is electrically connected to the welded portion (7) via the second connection segment (411b).

4. The first sampling terminal (411) is used to enable the collection of information within the cell (2) by the sampling unit (4) via the welded portion (7), and to apply a voltage to the housing (21) via the connecting sheet (3). The battery module (100) according to claim 3, characterized in that the second sampling terminal (412) is used to enable the sampling unit (4) to collect information in the cell (2) via the welded portion (7).

5. The battery module (100) according to claim 1, characterized in that the sampling unit (4) and the protection unit (5) are at least one of a flexible circuit board and a printed circuit board.

6. The battery module (100) according to claim 1, characterized in that the sampling unit (4) and the protective unit (5) are integrally molded.

7. The battery module (100) according to claim 1, characterized in that the sampling unit (4) and the protection unit (5) are perpendicular to each other.

8. The battery module (100) according to claim 1, characterized in that the protective portion (5) is provided on the side of the cell assembly where the pole column (23) is provided.

9. The battery module (100) according to claim 1, characterized in that the sampling unit (4) is a first flexible connecting member, and the first flexible connecting member is inserted into and engaged with the sampler (6).

10. The battery module (100) according to claim 1, characterized in that the protective portion (5) is a second flexible connecting member, and a protective circuit connecting the connecting sheet (3) and the housing (21) is provided within the second flexible connecting member.

11. The battery module (100) according to claim 10, characterized in that the protection circuit includes a fuse box or a fuse.

12. The battery module (100) according to claim 1, further comprising a frame (1), wherein a plurality of the cells (2) are arranged side by side within the frame (1).

13. A battery pack (200) characterized by including a battery module (100) according to any one of claims 1 to 12.

14. A vehicle (300) characterized by including a battery module (100) according to any one of claims 1 to 12.

15. A vehicle (300) characterized by including a battery pack (200) as described in claim 13.

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