Battery module and battery pack

Abstract

The application discloses a battery module and a battery pack. The battery module comprises a main body, the main body comprises a plurality of battery cell assemblies, the plurality of battery cell assemblies are sequentially stacked along the height direction of the main body, each battery cell assembly comprises a battery cell unit, and the battery cell unit is respectively provided with a positive electrode lead-out tab and a negative electrode lead-out tab at opposite ends along the length direction of the main body. Along the height direction of the main body, in the two adjacent battery cell units, the positive electrode lead-out tab of the first battery cell unit and the negative electrode lead-out tab of the second battery cell unit are located on the same side of the length direction of the main body, and one of the positive electrode lead-out tab of the first battery cell unit and the negative electrode lead-out tab of the second battery cell unit is bent to be connected with the other one, so that the battery cell units are connected in series. The application solves the problem that the welding steps and parts required when a plurality of battery cells are connected in series in the prior art are relatively many, and the cost is relatively high.

Description

Technical Field

[0001] This application relates to the field of soft-pack battery technology, and more specifically, to a battery module and battery pack. Background Technology

[0002] In existing technologies, when multiple battery cells are connected in series, they are typically stacked sequentially, and then busbars are welded between adjacent cells to achieve the series connection. This method requires numerous welding steps and components, and the process is cumbersome, resulting in a high cost for the battery module. Utility Model Content

[0003] The main purpose of this application is to provide a battery module and battery pack to solve the problem that the existing technology requires a lot of welding steps and parts when multiple cells are connected in series, resulting in high cost.

[0004] According to one aspect of this application, a battery module is provided, comprising: The main body includes multiple battery cell assemblies, which are stacked sequentially along the height direction of the main body. Each battery cell assembly includes a battery cell unit, and the battery cell unit has a positive electrode lead and a negative electrode lead at opposite ends along the length direction of the main body. In the body, along the height direction, in two adjacent battery cells, the positive lead of the first battery cell and the negative lead of the second battery cell are located on the same side of the body's length direction, and one of the positive lead of the first battery cell and the negative lead of the second battery cell is bent to connect with the other to connect the battery cells in series.

[0005] Furthermore, the battery cell assembly also includes a tray, and the battery cell units are disposed within the tray. In each battery cell unit, one of the positive electrode lead and the negative electrode lead includes a lap joint, which is connected to the battery cell unit. The other of the two leads includes: An extension section extends a predetermined length along the length direction of the main body, and a first end of the extension section is connected to an end of the battery cell unit away from the overlapping section, and a second end of the extension section opposite to the first end is located outside the tray; A bent section, which extends a predetermined length along the height direction of the body and is connected to a second end of the extended section; In this configuration, in two adjacent battery cells, the bent section of the first battery cell is electrically connected to the overlapping section of the second battery cell to connect the two adjacent battery cells in series.

[0006] Furthermore, both the overlapping section and the bent section are sheet-like structures; Furthermore, the battery cell assembly also includes: An insulating support is disposed on the tray and abuts against the battery cell unit; A conductive strip is disposed on the insulating support and extends along the width direction of the main body. The overlapping section overlaps the top end of the conductive strip. In two adjacent battery cell assemblies, the bent section of the first battery cell assembly is attached to the side of the conductive strip of the second battery cell assembly.

[0007] Furthermore, the insulating support includes a first insulating positioning block and a support portion, the support portion extending along the width direction of the main body, the conductive strip being disposed on the support portion, and the first insulating positioning block being disposed at both ends of the support portion; Along the height direction of the main body, one end of the first insulating positioning block is provided with a first protrusion, and the other end is provided with a first groove that cooperates with the first protrusion. In two adjacent first insulating positioning blocks, the first protrusion of the first first insulating positioning block is embedded in the first groove of the second first insulating positioning block.

[0008] Furthermore, the battery cell assembly also includes a second insulating positioning block, which is disposed on the tray and close to the extension section, and the second insulating positioning block abuts against the battery cell unit; Along the height direction of the main body, one end of the second insulating positioning block is provided with a second protrusion, and the other end is provided with a second groove that cooperates with the second protrusion. In two adjacent second insulating positioning blocks, the second protrusion of the first second insulating positioning block is embedded in the second groove of the second second insulating positioning block.

[0009] Furthermore, the battery cell assembly also includes an insulating strip disposed between the extension section and the tray so that the extension section is suspended from the tray.

[0010] Furthermore, the battery cell unit includes multiple battery cells, each of which has a positive electrode tab and a negative electrode tab at both ends. The multiple battery cells are arranged sequentially along the length of the main body and connected in series. The positive electrode tab of one of the first and last battery cells connected in series is the positive electrode lead-out tab, and the negative electrode tab of the other is the negative electrode lead-out tab.

[0011] Furthermore, along the length of the main body, in two adjacent battery cells, the positive electrode tab of the first battery cell is positioned close to the negative electrode tab of the second battery cell and is electrically connected to the negative electrode tab of the second battery cell through an intermediate bracket.

[0012] Furthermore, the intermediate support includes an insulating part and a conductive part, the insulating part is disposed on the cell assembly, and the conductive part is disposed on the insulating part, the conductive part including two nickel sheets and one aluminum sheet; In one of the two adjacent battery cells, a nickel sheet, the positive electrode tab of the first battery cell, the other nickel sheet, the negative electrode tab of the second battery cell, and the aluminum sheet are stacked and welded together along the height direction of the main body to connect the two adjacent battery cells in series.

[0013] On the other hand, this application also provides a battery pack, which includes the battery module.

[0014] In this application, by bending the positive or negative lead-out tab of the battery cell, it can be electrically connected to an adjacent battery cell to connect the battery cells in series. The series connection process is simpler, reduces material costs, and reduces welding steps. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, are illustrative and descriptive, serving to explain this application and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a structural diagram (a) of a battery module disclosed in an embodiment of this application; Figure 2 This is a structural diagram (II) of a battery module disclosed in an embodiment of this application; Figure 3 This is a split view of the battery module disclosed in the embodiments of this application; Figure 4 This is a structural diagram of a battery cell assembly with a negative terminal disclosed in an embodiment of this application; Figure 5 This is a structural diagram of the battery cell assembly disclosed in the embodiments of this application; Figure 6 This is a structural diagram of the tray disclosed in the embodiments of this application; Figure 7 This is a split view of the battery cell assembly disclosed in the embodiments of this application; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 for Figure 7 Enlarged view of point C in the middle; Figure 10 for Figure 7 Enlarged view of point B in the middle; Figure 11This is a structural diagram of the insulating support disclosed in the embodiments of this application; Figure 12 This is a split view of the battery cell assembly disclosed in the embodiments of this application; Figure 13 for Figure 12 Enlarged view of point D in the middle.

[0016] The above figures include the following reference numerals: 10. Main body; 11. Battery cell assembly; 111. Battery cell unit; 112. Positive lead-out tab; 1121. Overlap section; 1122. Extension section; 1123. Bending section; 113. Negative lead-out tab; 114. Tray; 115. Insulating support; 1151. First insulating positioning block; 1152. Support part; 1153. First protrusion; 1154. First groove; 116. Conductive strip; 117. Second insulating positioning block; 1171. Second protrusion; 1172. Second groove; 118. Insulating cotton strip; 119. Battery cell; 1191. Positive lead-out tab; 1192. Negative lead-out tab; 120. Intermediate support; 121. Insulation part; 20. Positive terminal; 30. Negative terminal; 40. Insulating end plate; 50. Outer shell end plate; 80. Long screw. Detailed Implementation

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. 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. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0020] As described in the background section, in related technologies, when multiple battery cells are connected in series, they are typically stacked sequentially, and then a busbar is welded between adjacent cells to achieve series connection. When welding the cells to the busbar, an injection-molded bracket is first placed on a tray, and an aluminum strip is placed on the bracket. One end of the aluminum strip is then welded to the tab of the battery cell, and the other end is welded to the end of the busbar. This process is repeated to weld the other end of the busbar to the adjacent battery cell, thus achieving series connection between adjacent cells. However, the existing technology requires numerous welding steps and components, resulting in a complex process and high cost for the battery module. Therefore, this application provides a battery module that requires fewer welding steps and has a lower cost. The battery module of this application will be described below with reference to the accompanying drawings.

[0021] Specifically, such as Figures 1 to 13 As shown, the battery module includes a main body 10. The main body 10 includes multiple battery cell assemblies 11. The multiple battery cell assemblies 11 are arranged along the height direction of the main body 10 (e.g., ...). Figure 1 The cells are stacked sequentially in the direction indicated by the middle arrow Z. Each cell assembly 11 includes a cell unit 111. The cell unit 111 is arranged along the length of the main body 10 (e.g., ...). Figure 1 Positive lead-out tab 112 and negative lead-out tab 113 are respectively provided at opposite ends (in the direction indicated by the middle arrow X).

[0022] Along the height direction of the main body 10, in two adjacent battery cell units 111, the positive lead-out tab 112 of the first battery cell unit 111 and the negative lead-out tab 113 of the second battery cell unit 111 are located on the same side of the length direction of the main body 10. One of the positive lead-out tab 112 of the first battery cell unit 111 and the negative lead-out tab 113 of the second battery cell unit 111 is bent to connect with the other one, so that the battery cell units 111 are connected in series.

[0023] In this embodiment, after the positive lead tab 112 or negative lead tab 113 of the battery cell unit 111 is bent, it can be electrically connected to the adjacent battery cell unit 111 to connect the battery cell units 111 in series. The series connection process is simpler, reduces material costs, and reduces welding steps.

[0024] Specifically, along the height direction of the main body 10, when two adjacent battery cells 111 are connected in series, in some embodiments, the positive terminal lead 112 of one battery cell 111 is bent towards the negative terminal lead 113 of the other battery cell 111 to achieve electrical connection. In other embodiments, the negative terminal lead 113 of one battery cell 111 is bent towards the positive terminal lead 112 of the other battery cell 111 to achieve electrical connection. When the battery cells 111 are connected in series in the above embodiments, there is no need to use a busbar, eliminating the busbar welding step and the required welding components, making the battery module assembly process simpler, faster, and cheaper. Furthermore, the process of bending the positive electrode lead-out tab 112 and the negative electrode lead-out tab 113 is relatively simple. The positive electrode lead-out tab 112 and the negative electrode lead-out tab 113 are thin, and after bending, they fit more closely to the outer side of the main body 10, allowing for a more compact stacking of the cell assembly 11. This not only reduces the overall thickness and weight of the cell module but also meets the requirements for miniaturized and lightweight equipment. By adjusting the bending angle of the positive electrode lead-out tab 112 or the negative electrode lead-out tab 113, the stacking requirements of cell assemblies 11 with different heights and lengths can be accommodated. In contrast, with traditional busbar welding methods, if the size of the cell unit 111 is changed, the busbar aperture, size, and welding position need to be redesigned, resulting in poor adaptability. The structure of this application is more flexible and can quickly respond to the production needs of battery modules of different specifications. Meanwhile, traditional busbar welding is prone to problems such as incomplete welds and pinholes, and these defects are difficult to detect. After the battery module is assembled into a vehicle, long-term vibration can easily cause the weld points to fall off, resulting in poor contact, excessive temperature rise, or even short circuits. This application reduces the number of welding operations, effectively reducing the gaps caused by welding and lowering the risk of connection failure.

[0025] Among them, such as Figures 1 to 2 As shown, the main body 10 also has a positive terminal 20 and a negative terminal 30, which are respectively connected to the two ends of all the battery cells 111 connected in series.

[0026] Furthermore, such as Figures 4 to 6 As shown, the battery cell assembly 11 also includes a tray 114. Battery cell units 111 are disposed within the tray 114. In each battery cell unit 111, one of the positive lead tab 112 and the negative lead tab 113 includes an overlap section 1121, which is connected to the battery cell unit 111. The overlap section 1121 extends a predetermined length along the X direction and in a direction away from the battery cell unit 111. The other of the positive lead tab 112 and the negative lead tab 113 includes an extension section 1122 and a bending section 1123. The extension section 1122 extends a predetermined length along the length direction of the body 10, and a first end of the extension section 1122 is connected to an end of the battery cell unit 111 opposite to the overlap section 1121. The second end of the extension section 1122, opposite to the first end, is located outside the tray 114. The bending section 1123 extends a predetermined length along the height direction of the body 10 and is connected to the second end of the extension section 1122. In this configuration, the bent section 1123 of the first battery cell 111 is electrically connected to the overlapping section 1121 of the second battery cell 111 to connect the two adjacent battery cell cells 111 in series. The second end of the extension section 1122 is located outside the tray 114, ensuring that the bent section 1123 does not interfere with or contact the tray 114, thus ensuring that the tray 114 is not energized. Along the X-direction, a notch is provided at the end of the tray 114 along its length direction. This notch is used to avoid the bent section 1123, allows for positioning of the bent section 1123, and reduces the length of the extension section 1122. The bent section 1123 can be configured to be perpendicular to the extension section 1122. The end of the bent section 1123 furthest from the extension section 1122 is electrically connected to the overlapping section 1121 to achieve electrical conductivity.

[0027] Furthermore, both the overlapping section 1121 and the bending section 1123 are sheet-like structures. The sheet-like structure of the overlapping section 1121 and the bending section 1123 facilitates processing, provides a larger contact area, ensures more reliable conductive contact, and effectively reduces resistance. The sheet-like structure also facilitates bending.

[0028] Furthermore, the extension section 1122 can also be configured as a sheet structure, with the extension section 1122 and the bending section 1123 integrally formed and manufactured using a bending process.

[0029] like Figures 7 to 10As shown, the battery cell assembly 11 further includes an insulating support 115 and a conductive strip 116. The insulating support 115 is disposed on the tray 114 and abuts against the battery cell unit 111. The insulating support 115 is disposed near the overlapping section 1121. The conductive strip 116 is disposed on the insulating support 115 and extends along the width direction of the main body 10, and the overlapping section 1121 overlaps the top end of the conductive strip 116. In two adjacent battery cell assemblies 11, the bent section 1123 of the first battery cell assembly 11 is abutted against the side of the conductive strip 116 of the second battery cell assembly 11. The conductive strip 116 may be provided with a rectangular block structure. The conductive strip 116 extends along the width direction of the main body 10, providing a continuous and flat overlapping surface for the overlapping section 1121, resulting in a larger contact area and more uniform force distribution, avoiding contact resistance fluctuations caused by insufficient local contact pressure. In the Z-direction, the bent section 1123 of the first cell assembly 11 is side-mounted and connected to the conductive strip 116 of the second cell assembly 11. This not only achieves electrical conduction but also provides stable support for the bent section 1123, reducing deformation or displacement of the bent section 1123 under vibration and impact, and ensuring long-term connection reliability. An insulating bracket 115 is mounted on the tray 114, isolating the tray 114 from the conductive strip 116, the bent section 1123, and the overlapping section 1121. This prevents the tray 114 from becoming energized and effectively prevents short circuits caused by conductivity of the tray 114. The conductive strip 116 can be made of aluminum.

[0030] To ensure the reliability of the series connection, the overlapping section 1121 can be welded to the conductive strip 116, and the bent section 1123 can also be welded to the side of the conductive strip 116 of the adjacent cell assembly 11. Compared with the prior art, this application requires fewer welding operations and has lower costs.

[0031] Furthermore, such as Figure 11 As shown, the insulating support 115 includes a first insulating positioning block 1151 and a support portion 1152. The support portion 1152 extends along the width direction of the main body 10, and a conductive strip 116 is disposed on the support portion 1152. First insulating positioning blocks 1151 are provided at both ends of the support portion 1152. The first insulating positioning blocks 1151 at both ends of the support portion 1152 can support the conductive strip 116 and also abut against the battery cell unit 111 to limit the positioning of the battery cell unit 111.

[0032] Along the height direction of the main body 10, one end of the first insulating positioning block 1151 is provided with a first protrusion 1153, and the other end is provided with a first groove 1154 that mates with the first protrusion 1153. In two adjacent first insulating positioning blocks 1151, the first protrusion 1153 of the first first insulating positioning block 1151 is embedded in the first groove 1154 of the second first insulating positioning block 1151. The first insulating positioning blocks 1151 are inserted through the tray 114. When multiple battery cell assemblies 11 are stacked, the first protrusion 1153 of the first first insulating positioning block 1151 is embedded in the first groove 1154 of the second first insulating positioning block 1151. This connection method allows the first insulating positioning blocks 1151 to be more stably spliced ​​together in the height direction of the main body 10, effectively preventing relative displacement between the first insulating positioning blocks 1151, thereby maintaining the stability of the battery module. The cooperation between the first protrusion 1153 and the first groove 1154 provides precise positioning guidance for the assembly of the first insulating positioning blocks 1151. During the assembly of the battery module, the operator can easily splice the first insulating positioning block 1151 together according to the shape of the first protrusion 1153 and the first groove 1154, which reduces the assembly error in the height direction and can also improve the assembly efficiency and quality of the battery module.

[0033] In this configuration, on the same first insulating positioning block 1151, along the height direction of the main body 10, the first protrusion 1153 and the first groove 1154 are interconnected. Along the height direction of the main body 10, the first insulating positioning blocks 1151 of multiple battery cell assemblies 11 are interconnected to form a first channel. When assembling battery modules, long screws 80 can be installed in the first channel to fix multiple battery modules together.

[0034] Furthermore, such as Figures 12 to 13 As shown, the battery cell assembly 11 also includes a second insulating positioning block 117. The second insulating positioning block 117 is disposed on the tray 114 and near the extension section 1122, and abuts against the battery cell unit 111. Along the height direction of the main body 10, one end of the second insulating positioning block 117 has a second protrusion 1171, and the other end has a second groove 1172 that mates with the second protrusion 1171. In two adjacent second insulating positioning blocks 117, the second protrusion 1171 of the first second insulating positioning block 117 is embedded in the second groove 1172 of the second second insulating positioning block 117. Similarly, in the Z direction, multiple second insulating positioning blocks 117 are sequentially stacked and nested, facilitating the installation of the battery module and improving the stability of the battery module.

[0035] In this configuration, on the same second insulating positioning block 117, along the height direction of the main body 10, the second protrusion 1171 and the second groove 1172 are interconnected. Along the height direction of the main body 10, the second insulating positioning blocks 117 of multiple battery cell assemblies 11 are interconnected to form a second channel. When assembling battery modules, long screws 80 can be installed in the second channel to fix multiple battery modules together.

[0036] Optionally, the tray 114 can provide a receiving space for the battery cell 111 and can limit the battery cell 111 to prevent displacement of the battery cell 111 relative to the tray 114. In this application, along the width direction of the main body 10 (e.g., Figure 1 (In the direction indicated by the middle arrow Y), both ends of the tray 114 are bent towards the battery cell 111 to form a flanged structure. The flanged structure abuts against the outer wall of the battery cell 111, thereby limiting the battery cell 111 in the Y direction. Along the length of the main body 10, the tray 114 is provided with the aforementioned first insulating positioning block 1151 near the overlapping section 1121. The first insulating positioning block 1151 abuts against the surface of the battery cell 111 in the length direction, limiting the battery cell 111 in the X direction. At the same time, along the length of the main body 10, the tray 114 is provided with the aforementioned second insulating positioning block 117 near the extension section 1122. The second insulating positioning block 117 abuts against the surface of the battery cell 111 in the length direction, limiting the battery cell 111 in the X direction. That is, in the X direction, both ends of the battery cell 111 are pressed between the first insulating positioning block 1151 and the second insulating positioning block 117.

[0037] Furthermore, the battery cell assembly 11 also includes an insulating strip 118, which is disposed between the extension section 1122 and the tray 114 so that the extension section 1122 is suspended from the tray 114. The insulating strip 118 prevents the extension section 1122 from contacting the tray 114, thus preventing the tray 114 from becoming energized. The insulating strip 118 also has a buffering and sealing effect, preventing electrolyte residue, dust, and other impurities from entering the gap between the extension section 1122 and the tray 114, avoiding the accumulation of impurities and the formation of a conductive path, thereby further improving the electrical safety of the module. The insulating strip 118 can be configured as a protective foam strip. The insulating strip 118 extends along the Y direction.

[0038] Furthermore, the cell unit 111 includes multiple cells 119. Each cell 119 has a positive electrode tab 1191 and a negative electrode tab 1192 at both ends. The multiple cells 119 are arranged sequentially along the length of the main body 10 and connected in series. The positive electrode tab 1191 of one of the first and last cells 119 connected in series is the positive electrode lead-out tab 112, and the negative electrode tab 1192 of the other is the negative electrode lead-out tab 113. The cell unit 111, composed of multiple cells 119 connected in series, allows for precise matching of the target voltage of the battery module by adjusting the number of cells 119 within the cell unit 111. This not only meets the low-voltage requirements of small devices but also adapts to high-voltage scenarios by increasing the number of cells 119 or the number of layers in the cell assembly 11, significantly improving the product's multi-scenario compatibility. In addition, after multiple cells 119 are connected in series, they are connected in series with other cell units 111 through positive lead-out tab 112 and negative lead-out tab 113, avoiding the cumbersome process of soldering one by one when multiple cells 119 are directly stacked.

[0039] Furthermore, along the length of the main body 10, in two adjacent cells 119, the positive electrode tab 1191 of the first cell 119 is positioned close to the negative electrode tab 1192 of the second cell 119 and electrically connected to the negative electrode tab 1192 of the second cell 119 via the intermediate support 120. The proximity of the positive and negative electrodes 1191 and 1192 of adjacent cells 119 significantly shortens the conductive distance between them, allowing multiple cells 119 to be arranged more compactly along the length, reducing redundant space within the cell unit 111. With the same number of cells 119, the overall length and volume of the cell unit 111 can be reduced, and path losses during current conduction are also reduced, improving energy utilization efficiency.

[0040] Furthermore, the intermediate support 120 includes an insulating part 121 and a conductive part. The insulating part 121 is disposed on the tray 114 of the cell assembly 11, and the conductive part is disposed on the insulating part 121. The conductive part includes two nickel sheets and one aluminum sheet. In this embodiment, for two adjacent battery cells 119, a nickel sheet, the positive electrode tab 1191 of the first battery cell 119, another nickel sheet, the negative electrode tab 1192 of the second battery cell 119, and an aluminum sheet are sequentially stacked and welded together along the height direction of the main body 10 to connect the two adjacent battery cells 119 in series. The nickel sheet has excellent welding compatibility and conductivity, and can form a strong weld joint with the electrode tab of the battery cell 119, reducing the risk of poor welding. The aluminum sheet combines lightweight and high conductivity, which can improve the current carrying capacity of the overall conductive path. In this embodiment, the stacked welding method significantly increases the conductive contact area, reduces contact resistance, avoids excessive local temperature rise when a large current passes through, and reduces power loss, especially suitable for high-rate charging and discharging scenarios. The insulating part 121 of the intermediate bracket 120 is directly fixed to the tray 114, isolating the conductive part from the tray 114 and other metal parts, structurally cutting off the lateral leakage path and preventing accidental contact between the conductive part and surrounding parts that could cause a short circuit.

[0041] On the other hand, embodiments of this application also provide a battery pack that includes the aforementioned battery module. Therefore, the battery pack incorporates all the technical effects of the aforementioned battery module. Since the technical effects of the battery module have already been described in detail above, they will not be repeated here.

[0042] In this application, the series connection between each layer of cell unit 111 no longer requires secondary transfer soldering via a bus, eliminating the need for a bus. This application optimizes the material usage to a minimum and also significantly simplifies the process. Figure 3 As shown, the top and bottom ends of the main body 10 of this application are provided with an insulating end plate 40 and a housing end plate 50, respectively. The insulating end plate 40 is located close to the cell assembly 11, and the housing end plate 50 is located outside the insulating end plate 40.

[0043] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery module, characterized in that, include: The main body (10) includes multiple battery cell assemblies (11), which are stacked sequentially along the height direction of the main body (10). Each battery cell assembly (11) includes a battery cell unit (111), and the battery cell unit (111) is provided with a positive electrode lead-out tab (112) and a negative electrode lead-out tab (113) at opposite ends along the length direction of the main body (10). Along the height direction of the main body (10), in two adjacent battery cells (111), the positive lead-out tab (112) of the first battery cell (111) and the negative lead-out tab (113) of the second battery cell (111) are located on the same side of the length direction of the main body (10), and one of the positive lead-out tab (112) of the first battery cell (111) and the negative lead-out tab (113) of the second battery cell (111) is bent to connect with the other one so that each battery cell (111) is connected in series.

2. The battery module according to claim 1, characterized in that, The battery cell assembly (11) further includes a tray (114), and the battery cell unit (111) is disposed in the tray (114). In each battery cell unit (111), one of the positive electrode lead-out tab (112) and the negative electrode lead-out tab (113) includes a connecting section (1121), which is connected to the battery cell unit (111). The other of the two includes: An extension segment (1122) extends a predetermined length along the length direction of the main body (10), and the first end of the extension segment (1122) is connected to the end of the battery cell (111) away from the overlapping segment (1121), and the second end of the extension segment (1122) opposite to the first end is located outside the tray (114); A bent segment (1123) extends a predetermined length along the height direction of the main body (10) and connects to the second end of the extension segment (1122); Among the two adjacent battery cells (111), the bent section (1123) of the first battery cell (111) is electrically connected to the overlapping section (1121) of the second battery cell (111) to connect the two adjacent battery cells (111) in series.

3. The battery module according to claim 2, characterized in that, Both the overlapping section (1121) and the bent section (1123) are sheet-like structures; and / or, The battery cell assembly (11) also includes: An insulating support (115) is disposed on the tray (114) and abuts against the battery cell (111); A conductive strip (116) is disposed on the insulating bracket (115) and extends along the width direction of the main body (10). The overlapping section (1121) overlaps the top of the conductive strip (116). In two adjacent battery cell assemblies (11), the bent section (1123) of the first battery cell assembly (11) is attached to the side of the conductive strip (116) of the second battery cell assembly (11).

4. The battery module according to claim 3, characterized in that, The insulating bracket (115) includes a first insulating positioning block (1151) and a bracket part (1152). The bracket part (1152) extends along the width direction of the main body (10). The conductive strip (116) is disposed on the bracket part (1152). The first insulating positioning block (1151) is disposed at both ends of the bracket part (1152). Along the height direction of the main body (10), one end of the first insulating positioning block (1151) is provided with a first protrusion (1153), and the other end is provided with a first groove (1154) that cooperates with the first protrusion (1153). In two adjacent first insulating positioning blocks (1151), the first protrusion (1153) of the first first insulating positioning block (1151) is embedded in the first groove (1154) of the second first insulating positioning block (1151).

5. The battery module according to claim 2, characterized in that, The battery cell assembly (11) further includes a second insulating positioning block (117), which is disposed on the tray (114) and close to the extension section (1122), and the second insulating positioning block (117) abuts against the battery cell unit (111); Along the height direction of the main body (10), one end of the second insulating positioning block (117) is provided with a second protrusion (1171), and the other end is provided with a second groove (1172) that cooperates with the second protrusion (1171). In two adjacent second insulating positioning blocks (117), the second protrusion (1171) of the first second insulating positioning block (117) is embedded in the second groove (1172) of the second second insulating positioning block (117).

6. The battery module according to claim 2, characterized in that, The battery cell assembly (11) also includes an insulating strip (118) disposed between the extension (1122) and the tray (114) such that the extension (1122) is suspended from the tray (114).

7. The battery module according to any one of claims 1 to 6, characterized in that, The battery cell unit (111) includes multiple battery cells (119). Each of the battery cells (119) has a positive electrode tab (1191) and a negative electrode tab (1192) at its opposite ends. The multiple battery cells (119) are arranged sequentially along the length of the main body (10) and connected in series. The positive electrode tab (1191) of one of the first and last battery cells (119) connected in series is the positive electrode lead-out tab (112), and the negative electrode tab (1192) of the other is the negative electrode lead-out tab (113).

8. The battery module according to claim 7, characterized in that, Along the length of the main body (10), in two adjacent cells (119), the positive electrode tab (1191) of the first cell (119) is positioned close to the negative electrode tab (1192) of the second cell (119) and is electrically connected to the negative electrode tab (1192) of the second cell (119) through an intermediate bracket (120).

9. The battery module according to claim 8, characterized in that, The intermediate support (120) includes an insulating part (121) and a conductive part. The insulating part (121) is disposed on the battery cell assembly (11), and the conductive part is disposed on the insulating part (121). The conductive part includes two nickel sheets and one aluminum sheet. Among them, in two adjacent cells (119), one nickel sheet, the positive electrode tab (1191) of the first cell (119), the other nickel sheet, the negative electrode tab (1192) of the second cell (119), and the aluminum sheet are stacked and welded together along the height direction of the main body (10) so that the two adjacent cells (119) are connected in series.

10. A battery pack, characterized in that, The battery pack includes the battery module as described in any one of claims 1 to 9.

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