Battery module, battery pack and vehicle

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] This application claims priority to a Chinese patent application with application number 202220482834.0, entitled "Battery Module, Battery Pack and Vehicle", filed with the China Patent Office on March 7, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of battery structures, and in particular to battery modules, battery packs and vehicles. [Background technology]

[0003] At present, lithium ion batteries have the advantages of 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 in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools, and are currently the main development direction for large battery manufacturers. A lithium ion battery generally has a plurality of cells inside, and for cells with poles at both ends, sampling must be performed at both ends of the cell, which increases the complexity and cost of the sampling structure, and the cell housing is generally not charged or has a low voltage, so that the electrolyte in the cell is likely to corrode the housing and the parts in the housing, which is likely to cause the problem of cell leakage, which affects the safety of the lithium ion battery.

[0004] Therefore, there is a need to improve the structure of lithium ion batteries in order to improve the overall safety performance of lithium ion batteries. Summary of the Invention

[0005] One objective of the embodiments of the present application is to provide a new technical solution for a battery module, a battery pack, and a vehicle.

[0006] According to a first aspect of the present application, there is provided a battery module, the battery module including a cell assembly and a sampling assembly; The cell assembly includes a plurality of cells, and poles are provided at both ends of each of the plurality of cells that are located opposite each other, and the plurality of cells are sequentially connected in series via a connection sheet, and each of the cells includes a housing, and on the positive electrode side of the cell assembly, the connection sheet connected to the positive electrode of each of the cells 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 connection sheet.

[0007] One embodiment As such, the sampling assembly includes a sampling portion, the sampling portion 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 on 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 is electrically connected to the welded portion and one of the connection sheets, and the second sampling terminal is electrically connected to the other welded portion.

[0010] One embodiment As such, the first sampling terminal includes a first connection segment and a second connection segment, the sampling portion is electrically connected to the welded portion via the first connection segment, and the connection sheet is electrically connected to the welded portion via the second connection segment.

[0011] One embodimentThe first sampling terminal is used to enable the sampling unit to collect information within the cell through the welded portion and to apply a voltage to the housing through the connection sheet, and the second sampling terminal is used to enable the sampling unit to collect information within the cell through the welded portion.

[0012] One embodiment The sampling assembly includes a protective portion, one end of the protective portion is electrically connected to the sampling terminal and the welding portion, and the other end of the protective portion is connected to the connection 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 As such, the sampling part (4) and the protection part (5) are integrally formed. One embodiment The sampling portion is provided on the top side of the cell assembly, and the protection portion is provided parallel to the sampling portion.

[0015] One embodiment As such, the sampling portion and the protection portion are perpendicular to each other.

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

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

[0018] One embodiment The protection section is a second flexible connection member, and a protection circuit that connects the connection sheet and the housing is provided within the second flexible connection member.

[0019] One embodiment For example, the protection circuit includes a fuse box or a fuse.

[0020] One embodiment and further comprising a frame, A plurality of the cells are arranged side by side within the frame.

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

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

[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 including a cell assembly and a sampling assembly. The housing can reduce damage caused by electrolyte in the cells infiltrating the housing after applying a constant voltage through the sampling assembly, ensure the integrity and stability of the housing, and improve the safety of use of the battery module by applying a constant voltage to the housing. In addition, the sampling unit may be a one-sided sampling unit, 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 the embodiments of the present application, taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0026] The drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. [Figure 1] FIG. 1 is a perspective view of a battery module according to an embodiment of the present application. [Diagram 2] FIG. 2 is an exploded view of a battery module according to an embodiment of the present application. [Diagram 3] 1 is a schematic diagram of one end of a battery module according to an embodiment of the present application. [Figure 4] 1 is a schematic diagram of the other end of a battery module according to an embodiment of the present application. [Diagram 5] 2 is a schematic diagram of one end of a battery module according to an embodiment of the present application; [Figure 6] 2 is a schematic diagram showing the other end of the battery module according to an embodiment of the present application. [Figure 7] 1 is a schematic diagram of a combination of a sampling unit and a protection unit of a battery module according to an embodiment of the present application. [Figure 8] 2 is a schematic diagram 2 of a combination of a sampling unit and a protection unit of a battery module according to an embodiment of the present application. [Figure 9] 3 is a schematic diagram 3 of a combination of a sampling unit and a protection unit of a battery module according to an embodiment of the present application. [Figure 10] 4 is a schematic diagram 4 of a combination of a sampling section and a protection section of a battery module according to an embodiment of the present application. [Figure 11] 1 is a schematic diagram of a battery pack according to an embodiment of the present application. [Figure 12] 1 is a schematic diagram of a vehicle according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting of the present application and its application or uses.

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

[0030] In all examples shown and discussed herein, any specific values ​​should be construed as merely illustrative and not limiting, and thus other examples of the example embodiments may have different values.

[0031] It should be noted that in the following drawings, the same reference symbols and letters indicate the same items, so that when an item is defined in one drawing, it does not need to be further described in the following drawings.

[0032] 1 to 10, an embodiment of the present application provides a battery module 100, which can be used in a power battery of an electric vehicle. The battery module 100 includes a cell assembly and a sampling assembly. In order to ensure that the performance of the battery module 100 is stable, the sampling assembly is used to sample cell information of the cell assembly, such as the temperature, pressure, and electrolyte storage amount 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 on opposite sides of the cells 2. As shown in Figure 1, in order to facilitate series connection of the plurality of cells 2, one end of the plurality of cells 2 may have positive and negative poles alternating in sequence, and the other end of the plurality of cells 2 may similarly have positive and negative poles alternating in sequence.

[0034] As shown in FIG. 1 to FIG. 3, the cells 2 are connected in series through the connection sheet 3, and poles are provided at both ends located on the opposite sides of the cells 2, that is, the connection sheets 3 are provided at both ends of the cell assembly. The cell 2 includes a housing 21, and the housing 21 may be provided with an explosion-proof valve 22. Still referring to FIG. 4, on the positive electrode side P of the cell assembly, the connection sheet 3 connected to the positive electrode of each of the cells 2 is electrically connected to the housing 21 of the corresponding cell 2, specifically, the part of each of the connection sheets 3 connected to the positive electrode of the cell 2 is electrically connected to the housing 21 of the corresponding cell 2. A constant voltage is applied to the housing 21 of the cell 2 by the connection sheet 3, that is, a constant voltage is applied to the housing 21 and the explosion-proof valve 22, thereby improving the potential of the housing 21 and the explosion-proof valve 22 and protecting the housing 21 and the explosion-proof valve 22.

[0035] 2 and 3, the sampling assembly electrically connects the housing 21 of the negative electrode side N of the cell assembly to the connection sheet 3, so that the sampling unit 4 can collect cell information such as the temperature, pressure, and amount of electrolyte stored in each cell 2, and then form potential protection in the housing 21. Specifically, the cells 2 are sequentially connected in series by the connection sheet 3, and then form one total positive electrode column and total negative electrode column that are directly connected to the outside, and 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 a thin aluminum material, and the housing 21 is sealed by applying a certain voltage through the connection sheet 3, i.e., by applying a certain voltage to the explosion-proof valve 22 in the housing 21, which can reduce damage caused by the electrolyte in the cell 2 infiltrating the housing 21 and the explosion-proof valve 22, ensure the integrity and stability of the housing 21 and the explosion-proof valve 22, and improve the safety of use of the battery module 100. In addition, the sampling assembly can also be sampled on one side, i.e., 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 includes a plurality of cells 2, and poles are installed at both ends located on the opposite sides of the cells 2, and the plurality of cells 2 are sequentially connected in series through a connection sheet 3. The cells 2 include a housing 21, and the connection sheet 3 connected to the positive electrode of each of the cells 2 is electrically connected to the housing 21 of the corresponding cell 2. After applying a certain voltage through the sampling assembly, that is, by applying a certain voltage to the housing 21, the housing 21 can reduce damage caused by the electrolyte in the cells 2 infiltrating the housing 21, ensure the integrity and stability of the housing 21, and improve the safety of use of the battery module 100. In addition, since the housing 21 of the cell 2 is charged, the sampling assembly can also sample on 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 portion 4, which 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, thereby collecting cell information such as the temperature, pressure, and amount of electrolyte stored in the cells 2, transmitting the information to the external sampling device, and further processing and monitoring the information, thereby ensuring 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 As such, a welded portion 7 is provided on 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 overlapped and connected to the sampling body of the sampling unit 4, and the other end or an intermediate position of the sampling terminal 41 may be welded to a welding portion 7 of the housing 21, and the welding portion 7 may be a welding point provided on the housing 21 to facilitate welding of the sampling terminal 41 and the housing 21. The welding portion 7 allows the sampling terminal 41 to realize an electrical connection between the housing 21 and the sampling unit 4. In addition, the sampling terminal 41 has characteristics such as a fast welding speed, small thermal deformation, and high density, which ensures that the sampling unit 4 can effectively collect cell information such as the temperature, pressure, and electrolyte storage amount of each cell 2.

[0042] One embodimentAs shown in Figures 3 to 6, 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 the welded portion 7 and the connection sheet 3, and the second sampling terminal 412 is electrically connected to the welded portion 7.

[0043] When the sampling assembly electrically connects the housing 21 of the negative electrode side N of the cell assembly to the connection sheet 3, the welded portion 7 and the connection sheet 3 can both be electrically connected by the first sampling terminal 411. That is, the first sampling terminal 411 can realize the collection of information inside the cell 2 by the sampling unit 4 through the welded portion 7, and can also realize the application of voltage to the housing 21 through the connection sheet 3. When a part of the sampling terminals 41 needs to collect only information inside the cell 2, only the second sampling terminal 412 may be electrically connected to the welded portion 7, and the second sampling terminal 412 realizes the collection of information inside the cell 2 by the sampling unit 4 through the welded portion 7, simplifying the structure of the sampling terminal 41. The connection sheet 3 and the housing 21 are electrically connected by an assembly provided with a protection circuit.

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

[0045] Specifically, when the sampling unit 4 samples the cell 2 through the first connection segment 411a, the connection sheet 3 can apply a voltage to the housing 21 through 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 welding portion 7, the other end of the first sampling terminal 411 is connected to the connection sheet 3, and the middle position of the first sampling terminal 411 can be welded to the housing 21 of the cell 2. In other words, the central portion of the first sampling terminal 411 can simultaneously realize the application of a voltage to the housing 21 of the cell 2 and the sampling by the sampling unit 4 by performing welding only once, simplifying the structure of the first sampling terminal 411 and the time cost of production.

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

[0047] Specifically, the housing 21 is connected directly to the poles of the cells 2 after a certain voltage is applied through the connection sheet 3, so that the protection part 5 can be provided between the connection sheet 3 and the welded part 7 of the housing 21 to prevent the connection sheet 3 from damaging the housing 21 when the voltage is too high. The protection part 5 can be a protection circuit such as a fuse box or a fuse, and 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. As shown in Figures 2 to 5, the sampling unit 4 and the protection unit 5 can be integrally formed into an assembly.

[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 the sampling part 4 and the protective part 5 are both molded on the assembly base, thereby improving the integrity and compactness of the sampling part 4 and the protective part 5.

[0050] One embodiment As shown in FIG. 2 and FIG. 3, when the sampling part 4 and the protection part 5 are PCBs, the sampling part 4 and the protection part 5 may be molded on a PCB substrate, so that the assembly forms a PCB, and the PCB may be an integrated BIC (Battery Information Collector). The PCB assembly can not only ensure the performance of the sampling part 4 and the protection part 5, but also reduce the influence of electromagnetic interference on the sampling part 4 and the protection part 5 by utilizing the good EMC (electromagnetic interference resistance) performance of the PCB. When the sampling part 4 and the protection part 5 are FPCs, as shown in FIG. 4 to FIG. 9, the sampling part 4 and the protection part 5 may be two independent FPCs, and the double-sided FPC may be formed by etching the circuit of the sampling part 4 on one side of the FPC substrate as shown in FIG. 7 and etching the circuit of the protection part 5 on the other side of the FPC substrate as shown in FIG. 8, as shown in FIG. 9.

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

[0052] Specifically, poles 23 are provided at both ends located on the opposite sides of cell 2, cell 2 is laid horizontally in frame 1, and the top side of the cell assembly has a flat top surface, so that when sampling unit 4 is provided at the top side of the cell assembly, the width dimension of sampling unit 4 (i.e., the dimension along the extending direction of cell 2) is not affected by the structure of poles on the side of cell 2, and the height of the side of cell 2 is not affected by the dimension of sampling unit 4. The width dimension of sampling unit 4 can be flexibly adjusted, for example, the width dimension of sampling unit 4 can be widened as the sampling unit 4 in FIG. 8 changes from the sampling unit 4 in FIG. 7, and the sampling unit 4 in FIG. 10 changes from the sampling unit 4 in FIG. 9, thereby filling the space required for wiring in sampling unit 4.

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

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

[0055] Specifically, poles 23 are provided at both ends located on the opposite sides of the cell 2, that is, a plurality of connection sheets 3 are provided at both ends of the cell assembly. In order to facilitate the installation of the protection part 5 between the connection sheet 3 and the housing 21, the protection part 5 may be provided at the end of the cell assembly. Since the sampling part 4 is provided at the top side of the cell assembly, the sampling part 4 and the protection part 5 can form a structure perpendicular to each other, and the protection part 5 and the connection sheet 3 are located at the same end of the cell 2, and thus the connection sheet 3 can be easily connected to the housing at the corresponding end of the cell 2 through the protection part 5, and the structure of the protection part 5 can be simplified.

[0056] One embodiment 9 and 10, the protection unit 5 is disposed in parallel with the sampling unit 4.

[0057] Specifically, since the connection sheet 3 is directly connected to the poles 23 of the cells 2, the protection unit 5 can be installed in parallel with the sampling unit 4 to avoid the connection sheet 3 interfering with 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 can be installed on the top side of the cell assembly or in a space higher than the cell assembly, ensuring the performance of the protection unit 5 is stable.

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

[0059] Specifically, the first flexible connection 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 connection 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 an insertion connection member, the sampler 6 can process the cell information collected from each cell 2 by the first flexible connector. Since the first flexible connection member has a flexible structure, the position and extension direction of the first flexible connection member can be flexibly set, improving the structural flexibility of the sampling unit 4.

[0060] One embodiment As shown in FIGS. 1 and 2, the protection section 5 is a second flexible connection member, and a protection circuit that connects the connection sheet 3 and the housing 21 is provided within the second flexible connection member.

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

[0062] One embodiment As such, 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] 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, the upper plate 12, and the side plate 13 form a receiving cavity 14 by bonding, welding, or screw connection, and the cell assembly is mounted in the receiving cavity 14 in the frame 1, and the frame 1 can provide support and protection for the cell assembly.

[0064] 11, which is a schematic diagram of a battery pack according to an embodiment of the present application. The embodiment of the present application further provides a battery pack 200 including at least one battery module 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, and poles are provided at both ends located on opposite sides of the cells 2, and the plurality of cells 2 are sequentially connected in series via a connection sheet 3. The cells 2 include a housing 21, and the connection sheet 3 connected to the positive electrode of each of the cells 2 is electrically connected to the housing 21 of the corresponding cell 2. After applying a certain voltage via the sampling assembly, that is, by applying a certain voltage to the housing 21, the housing 21 can reduce damage caused by the electrolyte in the cells 2 infiltrating the housing 21, ensure the integrity and stability of the housing 21, and improve the safety of use of the battery pack 200.

[0066] 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, which includes the battery pack 200, and at least one of the battery modules 100 is provided in the battery pack 200.

[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, and poles are provided at both ends located on opposite sides of the cells 2, and the plurality of cells 2 are sequentially connected in series via a connection sheet 3. The cells 2 include a housing 21, and the connection sheet 3 connected to the positive electrode of each of the cells 2 is electrically connected to the housing 21 of the corresponding cell 2. After a certain voltage is applied via the sampling assembly, that is, by applying a certain voltage to the housing 21, the housing 21 can reduce damage caused by the electrolyte in the cells 2 permeating the housing 21, ensure the integrity and stability of the housing 21, and improve the use safety of the vehicle 300.

[0068] Although some specific embodiments of the present application have been described in detail by using examples, those skilled in the art should understand that the above examples are merely for illustration purposes and are not intended to limit the scope of the present application. Those skilled in the art should understand that modifications can be made to the above examples without departing from the scope and spirit of the present application. The scope of the present application is indicated by the claims. [Explanation of symbols]

[0069] 1. Frame 11, lower plate 12. Upper plate 13. Side panel 14. Storage cavity 2. Cell 21. Housing 22. Explosion-proof valve 23, pole pillar 3. Connection sheet 4. Sampling section 41. Sampling terminal 411, the first sampling terminal 411a, first connection segment 411b, second connection segment 412, the second sampling terminal 42, output terminal 5, protection department 6. Sampler 7. Welding 100, battery module 200, battery pack 300, vehicle P, positive side of cell assembly N, negative side of the cell assembly.

Claims

1. A battery module (100) including a cell assembly and a sampling assembly, The cell assembly includes a plurality of cells (2), each of which has a pole (23) at both ends located opposite each other, the plurality of cells (2) being connected in series in sequence via a connection sheet (3), each of the cells (2) including a housing (21), and on the positive electrode side (P) of the cell assembly, the connection sheet (3) connected to the positive electrode of each of the cells (2) is electrically connected to the housing (21) of the corresponding one of the cells (2); The sampling assembly electrically connects the housing (21) of the negative electrode side (N) of the cell assembly to the connection sheet (3). The battery module (100) is characterized by:

2. The battery module (100) of claim 1, characterized in that the sampling assembly includes a sampling portion (4), the sampling portion (4) including 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).

3. The battery module (100) according to claim 2, characterized in that a welded portion (7) is provided on the housing (21), and the sampling portion (4) is electrically connected to the welded portion (7) via the sampling terminal (41).

4. The battery module (100) of claim 3, characterized in that 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 one of the welded portions (7) and the connection sheet (3), and the second sampling terminal (412) being electrically connected to the other of the welded portions (7).

5. The battery module (100) of claim 4, characterized in that the first sampling terminal (411) includes a first connection segment (411a) and a second connection segment (411b), the sampling portion (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).

6. the first sampling terminal (411) is used to realize collection of information in the cell (2) by the sampling unit (4) through the welding unit (7) and to apply a voltage to the housing (21) through the connection sheet (3); The battery module (100) of claim 5, characterized in that the second sampling terminal (412) is used to realize collection of information on the cell (2) by the sampling portion (4) via the welding portion (7).

7. The battery module (100) of any one of claims 3 to 6, characterized in that the sampling assembly includes a protective portion (5), one end of the protective portion (5) being electrically connected to the sampling terminal (41) and the welding portion (7), and the other end of the protective portion (5) being connected to the connection sheet (3).

8. The battery module (100) according to claim 7, characterized in that the sampling part (4) and the protection part (5) are at least one of a flexible circuit board and a printed circuit board.

9. The battery module (100) according to claim 7 or 8, characterized in that the sampling portion (4) and the protection portion (5) are integrally formed.

10. The battery module (100) according to any one of claims 7 to 9, characterized in that the sampling portion (4) is provided on the top side of the cell assembly, and the protection portion (5) is provided parallel to the sampling portion (4).

11. The battery module (100) according to any one of claims 7 to 9, characterized in that the sampling portion (4) and the protection portion (5) are perpendicular to each other.

12. The battery module (100) according to any one of claims 7 to 11, characterized in that the protective portion (5) is provided on a side of the cell assembly where the pole (23) is provided.

13. The battery module (100) according to any one of claims 1 to 12, characterized in that the sampling portion (4) is a first flexible connecting member, and the first flexible connecting member is inserted into and engaged with the sampler (6).

14. The battery module (100) according to any one of claims 7 to 13, 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.

15. The battery module (100) of claim 14, wherein the protection circuit comprises a fuse box or a fuse.

16. The battery module (100) according to any one of claims 1 to 15, further comprising a frame (1), wherein the plurality of cells (2) are arranged side by side within the frame (1).

17. A battery pack (200) comprising the battery module (100) according to any one of claims 1 to 16.

18. A vehicle (300) comprising the battery module (100) according to any one of claims 1 to 16 or the battery pack (200) according to claim 17.

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