Battery module

Abstract

The utility model discloses a battery module. The battery module comprises a battery cell assembly, a detection element and a circuit board, the battery cell assembly comprises at least one battery cell; the detection element is arranged on the battery cell assembly to detect the temperature of the battery cell; the circuit board is arranged on the battery cell assembly, a conductive connecting part is arranged on the circuit board, and the conductive connecting part and the circuit board are integrally formed and electrically connected with the detection element. The battery module at least can solve the problems that the temperature acquisition of the battery module is not accurate enough and the cost is too high.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, and more particularly to a battery module. Background Art

[0002] The performance of a battery module (such as capacity, output power, cycle life) is directly affected by the operating temperature. High temperatures may cause accelerated battery aging, capacity degradation, and may lead to thermal runaway; low temperatures will reduce the battery's discharge capacity. Therefore, accurate temperature monitoring is the basis for ensuring battery safety and efficiency. In large battery modules, due to factors such as uneven current distribution and different heat dissipation conditions, battery cells at different positions may experience different temperature changes, which requires the temperature detection device to be not only accurate but also capable of multi-point monitoring to capture the temperature gradient within the module.

[0003] The temperature detection of early battery modules relied on simple contact temperature sensors, such as thermistors (NTC) or thermocouples. Nowadays, most battery modules use new technologies such as non-contact infrared temperature sensors, fiber optic temperature sensors, and micro sensors integrated inside the battery to improve the accuracy of temperature detection of battery modules to a certain extent, but there are still problems in the prior art such as inaccurate temperature detection of battery modules and excessive costs. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a battery module, which can at least solve the problems of inaccurate temperature acquisition and excessive cost of the battery module.

[0005] According to one aspect of the utility model, a battery module is provided, including:

[0006] a battery cell assembly, the battery cell assembly including at least one battery cell;

[0007] a detection element, the detection element being disposed on the battery cell assembly to detect the temperature of the battery cell;

[0008] a circuit board, the circuit board being disposed on the battery cell assembly, the circuit board being provided with a conductive connection portion, the conductive connection portion being integrally formed with the circuit board and electrically connected to the detection element.

[0009] Further, the circuit board is provided with a suspended portion, and the suspended portion is folded towards the outer edge of the circuit board to form the conductive connection portion.

[0010] Further, a gap is provided at the edge of the circuit board. The gap includes a first gap segment extending in a first direction and a second gap segment connected to the first gap segment and extending in a direction perpendicular to the first direction. The region located at the edge of the circuit board and enclosed by the first gap segment and the second gap segment forms the suspended portion. The suspended portion is folded towards the outer edge of the circuit board and protrudes beyond the outer edge of the circuit board to form the conductive connection portion.

[0011] Further, the width of the second gap segment is 0.5 mm to 1.5 mm.

[0012] Further, there is a predetermined distance between the folding portion of the suspended portion and the end of the second gap segment away from the first gap segment.

[0013] Further, the length of the predetermined distance is 2 mm to 5 mm.

[0014] Further, positioning holes are provided on the conductive connection portion, and positioning members are provided on the battery cell. The positioning members are inserted into the positioning holes.

[0015] Further, there is a clearance fit between the positioning member and the positioning hole.

[0016] Further, the battery module further includes a bus bar. The bus bar is electrically connected to the electrode tab of the battery cell. The detection element is potted on the bus bar and electrically connected to the conductive connection portion.

[0017] Further, the battery cell assembly includes a plurality of the battery cells. The plurality of battery cells are arranged in sequence along a second direction. The conductive connection portions and the detection elements are both plural, and the conductive connection portions and the detection elements are provided in one-to-one correspondence;

[0018] Wherein, at least one of the detection elements is provided on one of the battery cells.

[0019] Compared with the prior art, the utility model has at least the following effects: The battery cell assembly can include one battery cell or multiple battery cells. In this embodiment, the battery cell assembly is composed of multiple battery cells, and the multiple battery cells are arranged in a preset shape and bundled and fixed. The detection element is arranged on the battery cell assembly to detect the temperature of the battery cell assembly in real time. In order to ensure more accurate temperature detection of the battery cell assembly of the utility model, multiple detection elements are installed on the battery cell assembly to perform multi-faceted detection of the temperature during the operation of the battery cell assembly for subsequent corresponding cooling of the battery cell assembly. The circuit board is arranged on the battery cell assembly and electrically connected to the detection element through a conductive connection part integrally formed with the circuit board. The temperature data of the battery cell assembly collected by the detection element can be transmitted to the corresponding device through the circuit board for analysis, providing accurate data for the subsequent heat dissipation and maintenance of the battery module.

[0020] That is to say, compared with the existing battery module, when using the battery module of the present application, since the conductive connection part and the circuit board are integrally formed, there is no need to set other conductive structures or connection structures to connect the detection element, greatly saving the production and manufacturing cost of the battery module. In addition, the conductive connection part integrally formed on the circuit board can transmit the signal detected by the detection element in real time. Compared with the method of additionally setting other conductive structures to transmit signals, the connection method in this embodiment is less likely to be affected by external factors in terms of signal transmission, and can ensure the accuracy of the detection by the detection element. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the utility model, and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model. In the drawings:

[0022] Figure 1 is the overall structure diagram of the battery module disclosed in the embodiment of the utility model;

[0023] Figure 2 is the structure diagram of the battery module from the first perspective disclosed in the embodiment of the utility model;

[0024] Figure 3 is the structure diagram of the circuit board and the bus bar of the battery module disclosed in the embodiment of the utility model;

[0025] Figure 4 is the structure diagram of the circuit board and the bus bar of the battery module from the first perspective disclosed in the embodiment of the utility model;

[0026] Figure 5 is Figure 4 the enlarged view of part A in

[0027] Figure 6 Structural diagram of the second perspective of the circuit board and busbar of the battery module disclosed in the embodiment of the present utility model;

[0028] Figure 7 is Figure 6 The enlarged view of part B in

[0029] Among them, the above-mentioned drawings include the following reference numerals:

[0030] 10, cell assembly; 11, cell; 12, positioning member; 20, detection element; 30, circuit board; 31, conductive connection part; 32, gap; 321, first gap segment; 322, second gap segment; 33, positioning hole; 40, busbar. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0033] Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, numerical expressions and values do not limit the scope of the present utility model. At the same time, it should be understood that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but should be regarded as part of the authorized specification when appropriate. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] See Figures 1 to 7 As shown, according to an embodiment of the present utility model, a battery module is provided, and the battery module includes a cell assembly 10, a detection element 20 and a circuit board 30.

[0035] Among them, the battery cell assembly 10 includes at least one battery cell 11. The detection element 20 is disposed on the battery cell assembly 10 to detect the temperature of the battery cell 11. The circuit board 30 is disposed on the battery cell assembly 10. A conductive connection portion 31 is provided on the circuit board 30. The conductive connection portion 31 is integrally formed with the circuit board 30 and is electrically connected to the detection element 20.

[0036] In the present utility model, the battery cell assembly 10 may include one battery cell 11 or may include multiple battery cells 11. In this embodiment, the battery cell assembly 10 is composed of multiple battery cells 11. The multiple battery cells 11 are arranged in a preset shape and bundled and fixed. The detection element 20 is disposed on the battery cell assembly 10 to perform real-time detection of the temperature of the battery cell assembly 10. In order to ensure more accurate temperature detection of the battery cell assembly 10 of the present utility model, multiple detection elements 20 are installed on the battery cell assembly 10 to perform multi-faceted detection of the temperature when the battery cell assembly 10 is working. This can provide more comprehensive data support for the cooling strategy of the battery module. The circuit board 30 is disposed on the battery cell assembly 10 and is electrically connected to the detection element 20 through the conductive connection portion 31 integrally formed with the circuit board 30. The temperature data of the battery cell assembly 10 collected by the detection element 20 can be transmitted to the corresponding device through the circuit board 30 for analysis, providing exact data for the subsequent heat dissipation and maintenance of the battery module.

[0037] That is to say, compared with the existing battery module, when using the battery module of the present application, since the conductive connection portion 31 and the circuit board 30 are integrally formed, there is no need to provide other conductive structures or connection structures to connect the detection element 20, which can save space and greatly save the production and manufacturing cost of the battery module. In addition, the conductive connection portion 31 integrally formed on the circuit board 30 can transmit the signal detected by the detection element 20 in real time. Compared with the method of additionally providing other conductive structures to transmit signals, the connection method in this embodiment is less susceptible to external factors in terms of signal transmission and can ensure the accuracy of the detection by the detection element 20.

[0038] Further, as shown in Figure 1 、 Figures 3 to 5 The circuit board 30 is provided with a suspended portion, and the suspended portion is folded toward the outer edge of the circuit board 30 to form the aforementioned conductive connection portion 31.

[0039] Specifically, the circuit board 30 may include flexible circuit boards such as FPC (Flexible Printed Circuit) and PCB (Printed Circuit Board). In this embodiment, the case where the circuit board is an FPC circuit board is shown. The hanging part is a part that can swing up and down relative to the circuit board 30 after being torn at the edge of the circuit board 30. That is to say, the conductive connection part 31 and the circuit board 30 are integrally formed. It can be seen that in this embodiment, the conductive connection part 31 can be processed without additionally increasing the size of the circuit board 30, with a simple structure and low production and manufacturing costs.

[0040] Exemplarily, the conductive connection part 31 can be one or more. In this embodiment, the battery cell assembly 10 is composed of a plurality of battery cells 11. Correspondingly, the conductive connection part 31 is also set to be a plurality. A plurality of hanging parts arranged at the edge of the circuit board 30 form the required plurality of conductive connection parts 31. The conductive connection part 31 can be formed by folding the hanging part towards the outer edge of the circuit board 30. This embodiment shows the case where the conductive connection part 31 is formed by folding the hanging part towards the outer edge of the circuit board 30. And, after the conductive connection part 31 is folded towards the outer edge of the circuit board 30 to the same horizontal plane, the included angle with the outer edge of the circuit board 30 can be an acute angle, a right angle, an obtuse angle, and a flat angle. This embodiment shows the case where the included angle between the conductive connection part 31 and the outer edge of the circuit board 30 is a right angle after being folded to the same horizontal plane. Further, as shown in Figure 5 As shown, a gap 32 is provided at the edge of the circuit board 30. The gap 32 includes a first gap segment 321 extending in a first direction and a second gap segment 322 connected to the first gap segment 321 and extending perpendicular to the first direction. The area located at the edge of the circuit board 30 and surrounded by the first gap segment 321 and the second gap segment 322 forms the hanging part described above. The hanging part is folded towards the outer edge of the circuit board 30 and protrudes from the outer edge of the circuit board 30 to form the conductive connection part 31, with a simple structure and convenient processing.

[0041] Specifically, the first direction is Figure 5 the direction indicated by the y-axis in Figure 5The opposite direction indicated by the x-axis in the figure. In this embodiment, the first slit segment 321 extends along the first direction. In other embodiments of the present application, the first slit segment 321 may extend in a direction at a certain angle to the first direction. For example, the first slit segment 321 may extend in a direction with an included angle of 10 degrees counterclockwise to the first direction. In this embodiment, the second slit segment 322 extends along the second direction. In other embodiments of the present application, the second slit segment 322 may extend in a direction at a certain angle to the second direction. For example, the second slit segment 322 may extend in a direction with an included angle of 10 degrees counterclockwise to the second direction. That is to say, the first slit segment 321 and the second slit segment 322 may be perpendicular to each other, may intersect at an acute angle, or may intersect at an obtuse angle. This embodiment shows the case where the first slit segment 321 and the second slit segment 322 are perpendicular to each other. It should be noted that in other embodiments of the present application, the second slit segment 322 may extend in the direction opposite to the second direction, that is, along Figure 5 the direction indicated by the x-axis in the figure. If a suitable axis of symmetry is selected, the presented situation can be exactly symmetrical to the situation presented in this embodiment.

[0042] Further, referring to Figure 5 as shown, the width of the second slit segment 322 is 0.5 mm to 1.5 mm. The width direction of the second slit segment 322 is Figure 5 the direction indicated by the y-axis in the figure. The width of the second slit segment 322 is set to 0.5 mm to 1.5 mm because when the battery module is working, heat will be generated, and the battery cells 11 and the circuit board 30 will undergo thermal expansion under the action of heat. The width of 0.5 mm to 1.5 mm can provide expansion space for the thermal expansion of the battery cells 11 and the circuit board 30. If the width of the second slit segment 322 is set too small, the battery cells 11 will pull the conductive connection part 31 after thermal expansion, and the circuit board 30 will be torn when the thermal expansion is severe, resulting in damage to the battery module. On the contrary, if the width of the second slit segment 322 is set too large, the position of the rest of the circuit board 30 relative to the conductive connection part 31 can change greatly, so that the circuit board 30 cannot be well fixed on the battery module, easily leading to damage to the circuit board 30.

[0043] Further, referring to Figure 5As shown, the folding point of the overhanging part is at a predetermined distance b from the end of the second slit section 322 that is far from the first slit section 321. The setting of the predetermined distance b is to prevent the circuit board 30 from being damaged. This is because when the battery module is working, heat is generated, and the heat will cause the temperature of the battery cells 11 and the circuit board 30 of the battery module to rise, resulting in thermal expansion of the battery cells 11 and the circuit board 30. After the battery cells 11 generate thermal expansion, they will pull the conductive connection part 31 to move towards the side away from the outer edge of the circuit board 30. If the predetermined distance b is not set at the end of the folding point of the overhanging part that is far from the first slit section 321 of the second slit section 322, it is very easy for the battery cells 11 to tear the circuit board 30 from the second slit section 322 after generating thermal expansion. However, after the predetermined distance b is set at the end of the folding point of the overhanging part that is far from the first slit section 321 of the second slit section 322, when the battery cells 11 generate thermal expansion and pull the conductive connection part 31 towards the side away from the outer edge of the circuit board 30, due to the setting of the predetermined distance b, it will not directly tear the conductive connection part 31 from the root of the second slit section 322 towards the side away from the outer edge of the circuit board 30. The setting of the predetermined distance b can well protect the circuit board 30 and also play a good role in protecting the entire battery module, extending the service life of the battery module.

[0044] Further, referring to Figure 5 As shown, the length of the predetermined distance b is 2 millimeters to 5 millimeters. The length of the predetermined distance b is set between 2 millimeters and 5 millimeters, which is determined by factors such as the scale of the battery module and the heat generation of the battery module.

[0045] Further, referring to Figure 5 As shown, positioning holes 33 are provided on the conductive connection part 31, and positioning members 12 are provided on the battery cells 11. The positioning members 12 are inserted into the positioning holes 33.

[0046] Specifically, the positioning holes 33 provided on the conductive connection part 31 include structures such as long-strip holes, square holes, and circular holes. In this embodiment, the shape of the positioning hole 33 is shown as a long-strip hole. Setting the positioning hole 33 as a long-strip hole is convenient for installation and can also protect the conductive connection part 31 to a certain extent. Since the conductive connection part 31 and the circuit board 30 are integrally formed structures, and the circuit board 30 is relatively thin and is easily damaged during installation and use, the shape of the positioning hole 33 is set as a long-strip hole. During the use of the battery module, when the battery module generates heat, causing the battery cells 11 and the circuit board 30 to thermally expand, and the installation position of the conductive connection part 31 changes relative to the original installation position, the shape of the long-strip hole can adapt to this position change, so as not to tear and damage the conductive connection part 31. When the shape of the positioning hole 33 is a long-strip hole, the length direction of the long-strip hole is perpendicular to the outer edge direction of the circuit board 30. Such a design is to better adapt to the change in the installation position of the conductive connection part 31 relative to the original installation position. It should be noted that when the positioning hole 33 is a square hole, a circular hole or other structures, the structure of the positioning member 12 on the battery cell 11 needs to be correspondingly changed to adapt to the change in the shape of the positioning hole 33, so as to better position the conductive connection part 31 and make the connection between the conductive connection part 31 and the battery cell 11 more reliable. In addition, the conductive connection part 31 and the battery cell 11 can also be connected by means of thermal riveting fixation. Such a fixation method has the advantages of high impact resistance, corrosion resistance, and strong seismic resistance.

[0047] Further, as shown in Figure 5 The fit between the positioning member 12 and the positioning hole 33 is a clearance fit. The fit between the positioning member 12 and the positioning hole 33 is set as a clearance fit to facilitate installation and better protect the conductive connection part 31. Since the conductive connection part 31 and the circuit board 30 are integrally formed and a relatively thin flexible circuit board such as FPC is used, it is easily damaged during the installation process. If the fit between the positioning member 12 and the positioning hole 33 is not a clearance fit, during installation, when the positioning member 12 passes through the positioning hole 33, it is easy to damage the hole edge of the positioning hole 33. When the conductive connection part 31 is fastened with the positioning member 12, it may even cause damage to the conductive connection part 31. Therefore, the fit between the positioning member 12 and the positioning hole 33 is set as a clearance fit to prevent damage to the conductive connection part 31.

[0048] Further, as shown in Figure 6 and Figure 7 The battery module further includes a bus bar 40. The bus bar 40 can be an aluminum plate. The bus bar 40 is electrically connected to the electrode tab (not shown in the figure) of the battery cell 11. The detection element 20 is encapsulated on the bus bar 40 and is electrically connected to the conductive connection part 31.

[0049] Specifically, the bus bar 40 can be in regular or irregular shapes such as rectangular, square, and circular, and there can be one or more bus bars 40. In this embodiment, the bus bar 40 is shown to be generally rectangular and there are multiple bus bars. The connection between the bus bar 40 and the tab of the battery cell 11 can adopt connection methods such as welding, bonding, and snap connection. In this embodiment, the connection between the bus bar 40 and the tab of the battery cell 11 is shown to be by welding. The detection element 20 is encapsulated on one side of the bus bar 40 close to the battery cell and is electrically connected to the conductive connection part 31. Such a setting is to enable the detection element 20 to accurately detect the temperature data of the battery cell 11. The reason for encapsulating the detection element 20 is that when the usage environment of the battery module is relatively humid, it is easy to damage the detection element 20.

[0050] Further, referring to Figure 1 , Figure 5 and Figure 7 as shown, the battery cell assembly 10 includes multiple battery cells 11, and the multiple battery cells 11 are arranged in sequence along the second direction. Both the conductive connection parts 31 and the detection elements 20 are multiple, and the conductive connection parts 31 and the detection elements 20 are arranged in one-to-one correspondence. Among them, at least one detection element 20 is provided on one battery cell 11. Since the battery cell assembly 10 includes multiple battery cells 11, and the conductive connection parts 31 are correspondingly arranged with the battery cells 11, and the detection elements 20 and the conductive connection parts 31 are arranged in one-to-one correspondence and are electrically connected, so that both the conductive connection parts 31 and the detection elements 20 are also multiple. One detection element 20 or multiple detection elements 20 can be provided on one battery cell 11, which can be reasonably adjusted according to needs. At the same time, considering the aspect of cost saving, in this embodiment, one detection element 20 is provided on one battery cell 11 to detect the temperature of the battery cell 11. There are also significant advantages in providing one detection element 20 on one battery cell 11, which is convenient for separately collecting the temperature data of each battery cell 11, so that the battery cells 11 at the local position of the battery cell assembly 10 can be cooled, making the cooling more accurate and fast.

[0051] As can be known from the above description: In this application, a battery module composed of a battery cell assembly 10, a detection element 20, a circuit board 30, and a bus bar 40 is provided to collect the temperature of the battery module. During assembly, first, a plurality of battery cells 11 are arranged in a preset shape and bundled and fixed to form the required battery cell assembly 10. Then, the detection element 20 is encapsulated on one side of the bus bar 40 close to the battery cells, and the bus bar 40 is electrically connected to the electrical connection part 31 of the circuit board 30 by using a positioning member 12 to pass through the positioning hole 33 provided on the electrical connection part 31. Finally, the bus bar 40 is electrically connected to the electrode tabs of the battery cells 11 to form the battery module of this application. In this application, the detection element 20 can detect the temperature of each battery cell 11 in the battery cell assembly 10, and transmit the collected data to the circuit board 30 through the electrical connection part 31 integrally formed with the circuit board 30. The circuit board 30 then transmits the data to a device connected to the circuit board 30 for data analysis. If it is necessary to cool the battery module, the corresponding cooling device is activated to cool the battery module.

[0052] It can be seen that in the battery module of this application, the electrical connection part 31 and the circuit board 30 are integrally formed, and at least one detection element 20 is provided on each battery cell 11 to detect the temperature of the battery cell 11, which not only ensures accurate temperature detection but also greatly reduces costs.

[0053] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above" or "on top of" other devices or structures will be positioned as "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings, so they cannot be understood as limitations on the protection scope of the present utility model.

[0055] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery module, characterized in that: include: A battery cell assembly (10), wherein the battery cell assembly (10) comprises at least one battery cell (11); A detection element (20), the detection element (20) being arranged on the battery cell assembly (10) to detect the temperature of the battery cell (11); A circuit board (30), the circuit board (30) being arranged on the battery cell assembly (10), the circuit board (30) being provided with a conductive connecting portion (31), the conductive connecting portion (31) being integrally formed with the circuit board (30) and being electrically connected to the detection element (20).

2. The battery module according to claim 1, characterized in that: The circuit board (30) is provided with a suspended portion, and the suspended portion is folded toward the outer edge of the circuit board (30) to form the conductive connection portion (31).

3. The battery module according to claim 2, characterized in that: The edge of the circuit board (30) is provided with a gap (32), the gap (32) comprising a first gap section (321) extending along a first direction and a second gap section (322) connected to the first gap section (321) and extending along a direction perpendicular to the first direction, the area located at the edge of the circuit board (30) and surrounded by the first gap section (321) and the second gap section (322) forming the suspended portion, the suspended portion being folded toward the outer edge of the circuit board (30) and protruding from the outer edge of the circuit board (30) to form the conductive connection portion (31).

4. The battery module according to claim 3, characterized in that: The width of the second slit section (322) is 0.5 mm to 1.5 mm.

5. The battery module according to claim 3, characterized in that: There is a predetermined distance between the folded portion of the suspended portion and an end of the second slit section (322) away from the first slit section (321).

6. The battery module according to claim 5, characterized in that: The length of the predetermined distance is 2 mm to 5 mm.

7. The battery module according to claim 1, characterized in that: The conductive connection portion (31) is provided with a positioning hole (33), the battery core (11) is provided with a positioning piece (12), and the positioning piece (12) is inserted into the positioning hole (33).

8. The battery module according to claim 7, characterized in that: There is a clearance fit between the positioning piece (12) and the positioning hole (33).

9. The battery module according to claim 1, characterized in that: The battery module further comprises a bus bar (40), wherein the bus bar (40) is electrically connected to the tabs of the battery cell (11), and the detection element (20) is plastic-sealed on the bus bar (40) and electrically connected to the conductive connection portion (31).

10. The battery module according to any one of claims 1 to 9, characterized in that: The battery cell assembly (10) comprises a plurality of battery cells (11), the plurality of battery cells (11) are arranged in sequence along a second direction, the conductive connecting portion (31) and the detecting element (20) are both multiple, and the conductive connecting portion (31) and the detecting element (20) are arranged in a one-to-one correspondence; Wherein, at least one detection element (20) is arranged on one of the battery cells (11).

Images