A battery pack and a manufacturing method thereof

Abstract

The application relates to the battery technical field and discloses a battery pack which comprises a box body and a battery cell module. The inside of the box body is provided with a containing cavity, and the battery cell module is arranged in the containing cavity. The battery cell module comprises a fixing frame and a module assembly, the module assembly comprises a plurality of battery cell modules arranged along a first direction, and the battery cell module comprises a fixing plate and at least one battery cell unit. The battery cell unit comprises a first battery cell, a second battery cell and a conductive piece, one end of the first battery cell towards the second battery cell is provided with a first tab, one end of the second battery cell towards the first battery cell is provided with a second tab, the first tab and the second tab are staggered along the first direction, the conductive piece is arranged between the first tab and the second tab, and the spacing between the first battery cell and the second battery cell is smaller than the length of the first tab and the second tab. The battery pack provided by the application can reduce the volume of the battery, thereby improving the comfort and safety of the vehicle. In addition, the application also provides a manufacturing method of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and its manufacturing method. Background Technology

[0002] With the development of technology, all-solid-state batteries have been widely used in today's society. Compared with traditional lithium batteries, all-solid-state batteries have advantages such as stronger safety, longer battery life, faster charging, and better stability at low temperatures, and are therefore favored by users.

[0003] Currently, most solid-state battery manufacturers choose to produce solid-state batteries using a pouch cell design. Due to the interface characteristics of solid-state batteries, a uniform pressure of 1-5 MPa is typically applied to the large surface area of ​​the electrode to achieve optimal performance. Applying such high pressure to the large surface area of ​​the electrode requires adding many components to the battery pack, resulting in a lower battery pack density and increased battery size, which is detrimental to vehicle comfort and safety. Summary of the Invention

[0004] This application provides a battery pack and a method for manufacturing the same, which can reduce the size of the battery, thereby improving the comfort and safety of the vehicle.

[0005] In a first aspect, this application provides a battery pack, including a housing and a cell module. The housing has an internal receiving cavity. The cell module is disposed within the receiving cavity and includes a mounting frame and a module assembly. The mounting frame is used to fix the module assembly. The module assembly includes a plurality of cell modules arranged along a first direction. The cell module includes a mounting plate and at least one cell unit, and the cell unit is disposed on the mounting plate.

[0006] The battery cell unit includes a first battery cell, a second battery cell, and a conductive element. The first battery cell and the second battery cell are arranged along a second direction, which is perpendicular to the first direction. A first tab is provided on the end of the first battery cell facing the second battery cell, and a second tab is provided on the end of the second battery cell facing the first battery cell. The first tab and the second tab are staggered along the first direction. The conductive element is disposed between the first tab and the second tab. The first tab and the second tab are respectively connected to the conductive element. The distance between the first battery cell and the second battery cell is less than the sum of the lengths of the first tab and the second tab.

[0007] By adopting the above technical solution, this application arranges the first tab 73 and the second tab 74 alternately along the X direction, and provides a conductive element 75 between the first tab 73 and the second tab 74, so that the first tab 73 and the second tab 74 are respectively connected to the conductive element 75 to realize the electrical connection between the first tab 73 and the second tab 74. This allows the distance between the first cell 71 and the second cell 72 to be less than the sum of the lengths of the first tab 73 and the second tab 74, reducing the size of the cell unit 7 along the Y direction, thereby reducing the volume of the battery pack and improving the comfort and safety of the vehicle.

[0008] In some implementations of this application, the first tab includes a first encapsulation portion and a first connecting portion, the first encapsulation portion being located on the side closer to the first battery cell, and the first connecting portion being located on the side farther from the first battery cell. The second tab includes a second encapsulation portion and a second connecting portion, the second encapsulation portion being located on the side closer to the second battery cell, and the second connecting portion being located on the side farther from the second battery cell. The first connecting portion and the second connecting portion are respectively connected to a conductive element; along a first direction, the projection of the first connecting portion is at least partially located on the second encapsulation portion, and the projection of the second connecting portion is at least partially located on the first encapsulation portion.

[0009] In some implementations of this application, the conductive element includes a main body, the projection of the main body along a third direction is a parallelogram, the third direction is perpendicular to the first direction and the second direction respectively, and the first connecting part and the second connecting part are respectively connected to two surfaces of the main body that are disposed opposite to each other along the first direction.

[0010] In some implementations of this application, the battery module includes two battery cell units, which are respectively disposed on both sides of the fixing plate along a first direction.

[0011] In some implementations of this application, a buffer layer and a heat insulation layer are provided between two adjacent battery cell modules.

[0012] In some implementations of this application, the mounting bracket includes a middle plate and two side plates. Both the middle plate and the two side plates extend along a second direction. One side plate is spaced along a first direction on one side of the middle plate, and the other side plate is spaced along the first direction on the other side of the middle plate. A spacer is provided between the middle plate and each of the two side plates to accommodate the module assembly.

[0013] Binding straps are provided between the middle plate and one side plate, and between the middle plate and another side plate; the binding straps are used to bind the middle plate, side plates and module components fitted therein.

[0014] In some implementations of this application, a pressure plate is provided on the side of each of the two side plates facing the module assembly. There is a gap between the pressure plate and the corresponding side plate. An elastic element is provided in the gap. The two ends of the elastic element abut against the side plate and the pressure plate, respectively. The elastic element is used to provide a force to the pressure plate towards the module assembly so that the pressure plate presses against the module assembly.

[0015] In some implementations of this application, the pressure plate is provided with a threaded hole extending in a first direction, and the side plate is provided with a through hole penetrating the side plate in the first direction. The number of through holes and threaded holes are equal and their positions correspond one-to-one. A bolt is also provided between the pressure plate and the side plate. The bolt passes through the through hole and is threadedly connected to the threaded hole corresponding to the position of the through hole.

[0016] In some implementations of this application, the sidewall of the receiving cavity is provided with multiple slots, and the two ends of the middle plate and the side plate can be respectively inserted into their corresponding slots.

[0017] Secondly, this application provides a method for manufacturing a battery pack as described in the first aspect, comprising:

[0018] The first tab of the first battery cell and the second tab of the second battery cell are respectively connected to the conductive component, and the distance between the first battery cell and the second battery cell is less than the sum of the lengths of the first tab and the second tab. The first battery cell, the second battery cell and the conductive component form a battery cell unit.

[0019] Connect the battery cell unit to the fixing plate to form a battery cell module;

[0020] Multiple battery cell modules are arranged sequentially along a first direction to form a modular assembly;

[0021] The module components are fixed using a mounting bracket, and the first and second battery cells are wired together to form a battery cell module.

[0022] The battery cell module is assembled into the receiving cavity of the housing. Attached Figure Description

[0023] Figure 1 A schematic diagram of the appearance of the battery pack provided in an embodiment of this application is shown;

[0024] Figure 2 An exploded view of the battery pack provided in an embodiment of this application is shown;

[0025] Figure 3 A top view of the battery cell module provided in the embodiments of this application is shown;

[0026] Figure 4 It shows Figure 3 A magnified view of part A in the middle;

[0027] Figure 5 A schematic diagram of the battery cell module provided in an embodiment of this application is shown;

[0028] Figure 6 A schematic diagram of the structure of the battery cell unit provided in the embodiments of this application is shown;

[0029] Figure 7 It shows Figure 6 A magnified view of part B in the middle section;

[0030] Figure 8 A schematic diagram of the structure of the fixing frame provided in the embodiment of this application is shown;

[0031] Figure 9 A simplified structural diagram of a battery pack in the prior art is shown;

[0032] Figure 10 A simplified structural diagram of the battery pack provided in an embodiment of this application is shown;

[0033] Figure 11 A top view of the mounting bracket provided in an embodiment of this application is shown;

[0034] Figure 12 It shows Figure 11 CC-direction sectional view;

[0035] Figure 13 It shows Figure 12 A magnified view of part D in the middle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0037] In existing technologies, the interface characteristics of all-solid-state batteries generally require the application of a uniform pressure of 1-5 MPa in the large-area direction of the electrode to achieve optimal performance. To apply such high pressure in the large-area direction of the all-solid-state battery electrode, many components need to be added to the battery pack. This results in a lower battery pack density, leading to an increased battery size, which is detrimental to vehicle comfort and safety.

[0038] To address the aforementioned problems, this application provides a battery pack that reduces battery size, thereby improving vehicle comfort and safety. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description of specific embodiments is provided.

[0039] Figure 1 This is a schematic diagram of the appearance of the battery pack provided in this embodiment. Figure 2 An exploded view of the battery pack provided in this embodiment. (Reference) Figure 1 and Figure 2 The battery pack provided in this embodiment includes a housing 1 and a cell module 2. The housing 1 has an internal receiving cavity 11. The cell module 2 is disposed within the receiving cavity 11. The cell module 2 includes a fixing frame 3 and a module assembly 4, the fixing frame 3 being used to fix the module assembly 4.

[0040] Figure 3 This is a top view of the battery cell module 2 provided in this embodiment. Figure 4 for Figure 3 A magnified view of part A in the middle. (Reference) Figure 3 and Figure 4 Module component 4 includes multiple components along the first direction (such as...) Figure 3 and Figure 4 The battery cell modules 5 are arranged in the X direction (as shown in the figure). A buffer layer and a heat insulation layer (not shown in the figure) may be provided between two adjacent battery cell modules 5.

[0041] Figure 5 A schematic diagram of a single battery cell module 5 is shown. (Reference) Figure 5 The battery cell module 5 includes a fixing plate 6 and at least one battery cell unit 7, the battery cell unit 7 being disposed on the fixing plate 6. Exemplarily, the battery cell unit 7 can be glued to the fixing plate 6, or it can simply be attached to the fixing plate 6; this embodiment does not limit this. Exemplarily, the number of battery cell units 7 is two, with the two battery cell units 7 respectively disposed on both sides of the fixing plate 6 along the X direction, such as... Figure 5 As shown.

[0042] Figure 6 A schematic diagram of a single battery cell unit 7 is shown. (Reference) Figure 6 The battery cell unit 7 includes a first battery cell 71, a second battery cell 72, and a conductive element 75. The first battery cell 71 and the second battery cell 72 are aligned along a second direction (e.g., Figure 6 The first battery cell 71 and the second battery cell 72 are arranged in the Y direction (as shown in the diagram), with the Y direction perpendicular to the X direction. Both ends of the first battery cell 71 and the second battery cell 72 are provided with tabs. The tab on the first battery cell 71 facing the side where the second battery cell 72 is located is the first tab 73, and the tab on the second battery cell 72 facing the side where the first battery cell 71 is located is the second tab 74. The first tab 73 and the second tab 74 are staggered along the X direction (that is, the projections of the first tab 73 and the second tab 74 along the X direction at least partially overlap). A conductive element 75 is disposed between the first tab 73 and the second tab 74, and the first tab 73 and the second tab 74 are respectively connected to the conductive element 75 to reduce the distance between the first battery cell 71 and the second battery cell 72 (as shown in the diagram). Figure 6 The dimension L shown in the figure is smaller than the length of the first tab 73 (as shown in the figure). Figure 6 The dimension L1 shown in the figure) and the length of the second electrode 74 (as shown in the figure) Figure 6The sum of dimensions L2 (as shown in the diagram). For example, conductive element 75 can be a bus.

[0043] This embodiment achieves electrical connection between the first tab 73 and the second tab 74 by staggering the first tab 73 and the second tab 74 along the X direction and placing a conductive element 75 between the first tab 73 and the second tab 74, so that the first tab 73 and the second tab 74 are respectively connected to the conductive element 75. This allows the distance between the first cell 71 and the second cell 72 to be less than the sum of the lengths of the first tab 73 and the second tab 74, reducing the size of the cell unit 7 along the Y direction, thereby reducing the volume of the battery pack and improving the comfort and safety of the vehicle.

[0044] Figure 7 for Figure 6 A magnified view of part B in the image. (Reference) Figure 7 The first tab 73 includes a first encapsulation portion 731 and a first connecting portion 732. The first encapsulation portion 731 is located on the side closer to the first battery cell 71, and the first connecting portion 732 is located on the side away from the first battery cell 71. The second tab 74 includes a second encapsulation portion 741 and a second connecting portion 742. The second encapsulation portion 741 is located on the side closer to the second battery cell 72, and the second connecting portion 742 is located on the side away from the second battery cell 72. The first connecting portion 732 and the second connecting portion 742 are respectively connected to the conductive member 75. Along the X direction, the projection of the first connecting portion 732 is at least partially located on the second encapsulation portion 741, and the projection of the second connecting portion 742 is at least partially located on the first encapsulation portion 731, thereby enabling a greater reduction in the size of the battery cell unit 7 along the Y direction, and thus a greater reduction in the volume of the battery pack.

[0045] This application does not limit the shape of the conductive element 75. Exemplarily, the conductive element 75 includes a body 751, the body 751 being oriented along a third direction (e.g., Figure 1 and Figure 2 The projection of the Z-direction (as shown in the diagram) is a parallelogram, with the Z-direction perpendicular to both the X and Y directions. The first connecting portion 732 and the second connecting portion 742 are respectively connected to two surfaces of the main body 751 that are opposite each other along the X-direction. In some other embodiments, such as... Figure 7 As shown, protrusions 752 may also be provided on two surfaces of the main body 751 that are opposite each other along the X direction. The first connecting portion 732 and the second connecting portion 742 are respectively connected to the two protrusions 752. By setting the main body 751 of the conductive member 75 as a parallelogram, it is possible not only to ensure that the projection of the first connecting portion 732 along the X direction is at least partially located on the second encapsulating portion 741, and the projection of the second connecting portion 742 along the X direction is at least partially located on the first encapsulating portion 731, but also to ensure that the connection structure between the first connecting portion 732 and the second connecting portion 742 is firm.

[0046] Figure 8 A schematic diagram of the fixture 3 is shown. (Reference) Figure 8 The fixing frame 3 includes a middle plate 31 and two side plates 32. Both the middle plate 31 and the two side plates 32 extend along the Y direction. One side plate 32 is spaced along the X direction on one side of the middle plate 31, and the other side plate 32 is spaced along the X direction on the other side of the middle plate 31. There are gaps 33 between the middle plate 31 and the two side plates 32. There are two module components 4, each disposed within one of the two gaps 33.

[0047] Furthermore, binding straps 34 are provided between the middle plate 31 and one side plate 32, and between the middle plate 31 and another side plate 32. The binding straps 34 are used to secure the middle plate 31, side plate 32, and module assembly 4 therein. For example, Figure 8 The two side plates 32 are designated as first side plate 321 and second side plate 322. A first strap 341 is fitted between the middle plate 31 and the first side plate 321, and a second strap 342 is fitted between the middle plate 31 and the second side plate 322. Multiple first straps 341 and second straps 342 are provided, alternating along the Y direction. When the first strap 341 is tightened, it can bind the middle plate 31, the first side plate 321, and the module assembly 4 between the middle plate 31 and the first side plate 321. When the second strap 342 is tightened, it can bind the middle plate 31, the second side plate 322, and the module assembly 4 between the middle plate 31 and the second side plate 322, thereby securing the module assembly 4 using the fixing frame 3.

[0048] Figure 9 This is a simplified structural diagram of a battery pack in the prior art. (Reference) Figure 9 The battery pack includes a housing 1a, which includes a central beam 11a and two side beams 12a. The central beam 11a is located between the two side beams 12a, and each side beam 12a has a receiving cavity 13a between the central beam 11a and the two side beams 12a. Each receiving cavity 13a contains a cell module 2a, and each cell module 2a includes two side plates 21a and a cell module assembly 22a disposed between the two side plates 21a. Figure 9 As can be seen from the structure shown, the battery pack has four side plates 21a along the X direction.

[0049] Figure 10 This is a simplified structural diagram of the battery pack in this embodiment. In this embodiment, the housing 1 includes two side beams 12, but there is no intermediate beam between the two side beams 12.

[0050] contrast Figure 9 and Figure 10 It can be seen that, Figure 10 The embodiment shown here uses a middle plate 31 in the fixing frame 3 to replace the intermediate beam 11a in the box 1a in the prior art. Since there is no side plate 32 between the middle plate 31 and the module assembly 4, it is more efficient than... Figure 9 As shown in the prior art, this embodiment can save two side plates and the corresponding assembly gaps, thereby reducing the size of the battery pack along the X direction and further reducing the volume and weight of the battery pack.

[0051] In some implementations of this embodiment, reference is made to Figure 3 ( Figure 3 (not shown) 34) and Figure 11 In the fixing frame 3, each of the two side plates 32 facing the module assembly 4 is provided with a pressure plate 35. A gap exists between the pressure plate 35 and its corresponding side plate 32, and an elastic element 36 is provided within the gap. The two ends of the elastic element 36 abut against the side plate 32 and the pressure plate 35, respectively. The elastic element 36 provides a force to the pressure plate 35 towards the module assembly 4, so that the pressure plate 35 presses against the module assembly 4. Figure 3 As shown.

[0052] When the module assembly 4 needs to be installed into the space 33 between the middle plate 31 and the two side plates 32, the pressure plate 35 is first moved away from the middle plate 31 until the distance between the pressure plate 35 and the middle plate 31 is greater than the dimension of the module assembly 4 in the X direction, so that the operator can easily insert the module assembly 4 between the pressure plate 35 and the middle plate 31. After the module assembly 4 is inserted between the pressure plate 35 and the middle plate 31, the operator releases the force on the pressure plate 35, the elastic member 36 returns to its elastic deformation, and the elastic member 36 pushes the pressure plate 35 to move closer to the middle plate 31 until the pressure plate 35 presses against the module assembly 4. In this embodiment, by setting the pressure plate 35 and the elastic member 36, the pressure plate 35 can be used to press the module assembly 4 tightly, thereby increasing the clamping force between the first tab 73 and the second tab 74.

[0053] Figure 12 for Figure 11 CC-direction sectional view, Figure 13 for Figure 12 A magnified view of part D in the middle section. (Reference) Figure 12 and Figure 13 The pressure plate 35 is provided with a threaded hole 37 extending in the X direction, and the side plate 32 is provided with a through hole 38 extending through the side plate 32 in the X direction. The number of through holes 38 and threaded holes 37 are equal and their positions correspond one-to-one. A bolt 39 is also provided between the pressure plate 35 and the side plate 32. The bolt 39 passes through the through hole 38 and is threadedly connected to the threaded hole 37 corresponding to the position of the through hole 38.

[0054] By using bolt 39, the movement of pressure plate 35 along the X direction can be adjusted by rotating bolt 39, thus facilitating the operator's adjustment of the position of pressure plate 35. When the operator stops rotating bolt 39, bolt 39 self-locks, and pressure plate 35 stops moving. After module assembly 4 is placed between middle plate 31 and pressure plate 35, the operator can remove bolt 39 from threaded hole 37, thereby pressing pressure plate 35 against module assembly 4 under the action of elastic element 36.

[0055] Further reference Figure 2 The side wall of the receiving cavity 11 is provided with multiple slots 13, and the two ends of the middle plate 31 and the side plate 32 can be respectively inserted into the corresponding slots 13. When the operator puts the battery cell module 2 into the housing 1, the operator can insert the two ends of the middle plate 31 and the side plate 32 into the corresponding slots 13 to facilitate the positioning of the battery cell module 2.

[0056] This embodiment also provides a method for manufacturing the aforementioned battery pack, comprising:

[0057] Step S1: Connect the first tab 73 of the first battery cell 71 and the second tab 74 of the second battery cell 72 to the conductive element 75 respectively, and make the distance between the first battery cell 71 and the second battery cell 72 less than the sum of the lengths of the first tab 73 and the second tab 74. The first battery cell 71, the second battery cell 72 and the conductive element 75 form a battery cell unit 7, as shown below. Figure 6 As shown;

[0058] Step S2: Connect the battery cell unit 7 to the fixing plate 6. For example, two battery cell units 7 can be respectively disposed on both sides of the fixing plate 6 to form a battery cell module 5, such as... Figure 5 As shown.

[0059] Step S3: Arrange multiple battery cell modules 5 sequentially along the X direction to form a configuration as shown in Figure 5. Figure 2 Module component 4 in the middle;

[0060] Step S4: Place the two module components 4 into the two space 33 of the fixing frame 3 respectively, fix the module components 4 with the fixing frame 3, and connect the high and low voltage wires of each first cell 71 and each second cell 72 to form the cell module 2.

[0061] For example, the wiring method can be 1P4S (one parallel and four series) or 2P2S (two parallel and two series), and this application does not limit this. The high and low voltage interfaces after wiring can be... Figure 2 The conductive element 8 shown extends to the outside of one side plate 32 to facilitate later connection with BDU (Battery Disconnect Unit) and BMS (Battery Management System).

[0062] Step S5: Insert the battery cell module 2 into the housing cavity 11, so that the two ends of the middle plate 31 and the side plate 32 can be respectively inserted into the corresponding slots 13 to position the battery cell module 2.

[0063] Furthermore, in step S4, fixing the module component 4 using the fixing bracket 3 includes:

[0064] Before placing the module assembly 4 between the side plate 32 and the middle plate 31, rotate the bolt 39 so that the bolt 39 drives the pressure plate 35 to move away from the middle plate 31 until the distance between the pressure plate 35 and the middle plate 31 is greater than the dimension of the module assembly 4 in the X direction.

[0065] Place module component 4 between middle plate 31 and pressure plate 35;

[0066] Rotate the bolt 39 in the opposite direction to remove it from the threaded hole 37 and the through hole 38, so that the pressure plate 35 is pressed against the module assembly 4 under the action of the elastic member 36.

[0067] This embodiment achieves electrical connection between the first tab 73 and the second tab 74 by staggering their arrangement along the X-direction and placing a conductive element 75 between them. This allows the first tab 73 and the second tab 74 to be connected to the conductive element 75, thus reducing the distance between the first cell 71 and the second cell 72 to be less than the sum of the lengths of the first tab 73 and the second tab 74, thereby reducing the size of the cell unit 7 along the Y-direction. Furthermore, this application employs a special design for the mounting bracket 3, using the middle plate 31 within the mounting bracket 3 to replace the intermediate beam 11a within the housing 1a in the prior art. This reduces the number of side plates 32, thereby decreasing the size of the battery pack along the X-direction and the overall volume of the battery pack, further improving vehicle comfort and safety.

[0068] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details have been omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0069] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0070] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0072] In the description of this application, it should be noted that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "fit" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery pack, characterized in that, include: The box has an internal cavity for receiving contents; A battery cell module is disposed within the receiving cavity. The battery cell module includes a fixing frame and a module assembly. The fixing frame is used to fix the module assembly. The module assembly includes a plurality of battery cell modules arranged along a first direction. The battery cell module includes a fixing plate and at least one battery cell unit, and the battery cell unit is disposed on the fixing plate. The battery cell unit includes a first battery cell, a second battery cell, and a conductive element. The first battery cell and the second battery cell are arranged along a second direction, which is perpendicular to the first direction. A first tab is provided on the end of the first battery cell facing the second battery cell, and a second tab is provided on the end of the second battery cell facing the first battery cell. The first tab and the second tab are staggered along the first direction. The conductive element is disposed between the first tab and the second tab. The first tab and the second tab are respectively connected to the conductive element. The distance between the first battery cell and the second battery cell is less than the sum of the lengths of the first tab and the second tab.

2. The battery pack according to claim 1, characterized in that, The first tab includes a first encapsulation portion and a first connection portion, wherein the first encapsulation portion is located on the side closer to the first battery cell, and the first connection portion is located on the side farther away from the first battery cell; The second tab includes a second encapsulation portion and a second connection portion, wherein the second encapsulation portion is located on the side closer to the second battery cell, and the second connection portion is located on the side farther away from the second battery cell; The first connecting portion and the second connecting portion are respectively connected to the conductive element; along the first direction, the projection of the first connecting portion is at least partially located on the second encapsulation portion, and the projection of the second connecting portion is at least partially located on the first encapsulation portion.

3. The battery pack according to claim 2, characterized in that, The conductive component includes a main body, the projection of which along a third direction is a parallelogram, the third direction being perpendicular to the first direction and the second direction respectively, and the first connecting portion and the second connecting portion being respectively connected to two surfaces of the main body that are arranged opposite to each other along the first direction.

4. The battery pack according to claim 1, characterized in that, The battery module includes two battery cells, which are respectively disposed on both sides of the fixing plate along the first direction.

5. The battery pack according to claim 4, characterized in that, A buffer layer and a heat insulation layer are provided between two adjacent battery cell modules.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The fixing frame includes: The middle plate extends along the second direction; Two side plates extend along the second direction, one of the side plates is spaced apart on one side of the middle plate along the first direction, and the other side plate is spaced apart on the other side of the middle plate along the first direction; there is a space between the middle plate and the two side plates, and the space is used to accommodate the module assembly; A binding strap is provided between the middle plate and one of the side plates, and between the middle plate and the other side plate; the binding strap is used to bind the middle plate, the side plates and the module assembly therein.

7. The battery pack according to claim 6, characterized in that, Each of the two side plates has a pressure plate on the side facing the module assembly. There is a gap between the pressure plate and the corresponding side plate. An elastic element is provided in the gap. The two ends of the elastic element abut against the side plate and the pressure plate, respectively. The elastic element is used to provide a force to the pressure plate towards the module assembly so that the pressure plate presses against the module assembly.

8. The battery pack according to claim 7, characterized in that, The pressure plate is provided with threaded holes extending along the first direction, and the side plate is provided with through holes penetrating the side plate along the first direction. The number of through holes and threaded holes are equal and their positions correspond one-to-one. A bolt is also provided between the pressure plate and the side plate. The bolt passes through the through hole and is threadedly connected to the threaded hole corresponding to the position of the through hole.

9. The battery pack according to claim 6, characterized in that, The side wall of the receiving cavity is provided with multiple slots, and the two ends of the middle plate and the side plate can be respectively inserted into the corresponding slots.

10. A method for manufacturing a battery pack as described in any one of claims 1 to 9, characterized in that, include: The first tab of the first battery cell and the second tab of the second battery cell are respectively connected to the conductive component, and the distance between the first battery cell and the second battery cell is less than the sum of the lengths of the first tab and the second tab. The first battery cell, the second battery cell and the conductive component form the battery cell unit. The battery cell unit is connected to the fixing plate so that the battery cell unit and the fixing plate form the battery cell module; Multiple battery cell modules are arranged sequentially along the first direction to form a module assembly; The module assembly is fixed using a mounting bracket, and the first and second battery cells are wired together to form a battery cell module. The battery cell module is assembled into the receiving cavity of the housing.

Images