Battery pack and electric device

Abstract

The application relates to the battery technical field and provides a battery pack and a power utilization device. The battery pack disclosed by the application comprises a battery cell module and a first cooling structure; the battery cell module is at least two arranged in sequence along the length direction of the battery pack, each battery cell module comprises a plurality of battery cells arranged in sequence and a gasket assembly connected with the battery cells; the first cooling structure comprises cooling pipe groups corresponding to and connected with the gasket assemblies, two adjacent cooling pipe groups are connected through an expansion pipe group, and the expansion pipe group can at least expand and contract in the length direction of the battery pack. The battery pack disclosed by the application can not only absorb the heat at the position of the gasket assembly in the process of the charging and discharging cycle of the battery cell, improve the whole-pack fast-charging performance, but also can reduce the influence caused by the displacement of the gasket assembly due to the expansion of the battery cell to a certain extent, avoid the cooling failure between the gasket assembly and the cooling pipe group, and improve the safety of the battery pack, so that the whole-pack quality can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With increasingly higher fast charging rates in current battery packs, the overheating of the terminals and battery terminals on the battery module is becoming more and more serious. In the cooling solutions for terminals and battery terminals, the cooling plate of the battery terminal is usually fixed to the battery terminal by adhesive. During the charge and discharge cycle of the battery cell, the cell expands, and the battery terminal will shift accordingly. In severe cases, this can lead to increasing tearing between the battery terminal cooling plate and the battery terminal, tearing the adhesive, causing failure, affecting the safety of the battery pack, and hindering the improvement of battery pack quality. Utility Model Content

[0003] In view of this, this application aims to provide a battery pack that improves the overall quality of the pack.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery pack includes a cell module and a first cooling structure; The cell module comprises at least two cells arranged sequentially along the length of the battery pack. Each cell module includes a plurality of cells arranged sequentially and a battery cell assembly connecting each cell. The first cooling structure includes cooling pipe groups corresponding to and connected to each of the battery pack components. Adjacent cooling pipe groups are connected by telescopic pipe groups, and the telescopic pipe groups are at least able to extend and retract in the length direction of the battery pack.

[0005] Furthermore, each of the aforementioned cell modules is disposed on the top of the corresponding cell module and includes a first cell module and a second cell module spaced apart along the width direction of the battery pack; the cooling pipe assembly includes a first cooling pipe corresponding to and connected to the first cell module and a second cooling pipe corresponding to and connected to the second cell module; the telescopic pipe assembly includes a first telescopic pipe connecting two adjacent first cooling pipes and a second telescopic pipe connecting two adjacent second cooling pipes.

[0006] Furthermore, the first cooling structure includes a manifold, and the manifold is provided at both ends of the battery pack along its length, and each of the first cooling pipes and the corresponding second cooling pipes are connected through the manifold at the same end.

[0007] Furthermore, both the first telescopic tube and the second telescopic tube include a telescopic section and connecting sections disposed at both ends of the telescopic section; each of the first cold tubes is inserted into the connecting section of the corresponding first telescopic tube, and / or each of the second cold tubes is inserted into the connecting section of the corresponding second telescopic tube.

[0008] Furthermore, in the length direction of the battery pack, the length L1 of each connecting segment in the first telescopic tube satisfies: L1≥3mm; and / or, in the length direction of the battery pack, the length L2 of each connecting segment in the second telescopic tube satisfies: L2≥3mm.

[0009] Furthermore, each connecting segment of the first telescopic tube is welded to the corresponding first cold pipe; and / or, each connecting segment of the second telescopic tube is welded to the corresponding second cold pipe.

[0010] Furthermore, the telescopic section in the first telescopic tube and / or the telescopic section in the second telescopic tube are made of corrugated pipe.

[0011] Furthermore, it also includes a second cooling structure; the second cooling structure includes a cold plate disposed at the bottom of each of the battery cell modules.

[0012] Furthermore, the cooling pipe assembly and the cold plate are connected by a connecting pipe assembly.

[0013] Compared with related technologies, this application has the following advantages: (1) The battery pack described in this application connects two adjacent cooling pipe groups through telescopic pipes, and the telescopic pipe groups can extend and retract at least in the length direction of the battery pack. This not only absorbs the heat at the location of the battery pack assembly during the charging and discharging cycle of the battery cell, thus improving the fast charging performance of the entire pack, but also reduces the impact of the displacement of the battery pack assembly when the battery cell expands to a certain extent, preventing the battery pack assembly from separating from the cooling pipe group and causing cooling failure, thereby improving the safety of the battery pack and thus improving the overall quality of the pack.

[0014] (2) The cooling tube assembly includes a first cooling tube corresponding to and connected to the first foil unit and a second cooling tube corresponding to and connected to the second foil unit, which can avoid the explosion-proof valves of each cell and avoid affecting the pressure relief of each cell explosion-proof valve when thermal runaway. At the same time, the telescopic tube assembly includes a first telescopic tube connecting two adjacent first cooling tubes and a second telescopic tube connecting two adjacent second cooling tubes. The first telescopic tube and the second telescopic tube can be used to reduce the risk of cooling failure caused by the displacement of the first foil unit and the displacement of the second foil unit when the cell expands, thereby helping to ensure the safety of the whole package.

[0015] (3) This allows each first cold pipe and its corresponding second cold pipe to be connected through a manifold at the same end, which can optimize the coolant flow path, reduce the difference in coolant flow rate between each first cold pipe and each second cold pipe, improve the overall cooling efficiency, and at the same time simplify the structure, reduce the number and complexity of pipes, and reduce costs.

[0016] (4) Both the first telescopic pipe and the second telescopic pipe include telescopic sections and connecting sections located at both ends of the telescopic sections. The structure is simple and easy to manufacture. At the same time, it allows each first cold pipe to be inserted into the connecting section of the corresponding first telescopic pipe and each second cold pipe to be inserted into the connecting section of the corresponding second telescopic pipe, which can help improve the convenience and reliability of the connection between the first telescopic pipe and each first cold pipe and between the second telescopic pipe and each second cold pipe.

[0017] (5) In the length direction of the battery pack, the length L1 of each connecting segment in the first telescopic tube satisfies: L1≥3mm, and the length L2 of each connecting segment in the second telescopic tube satisfies: L2≥3mm. This can help ensure the connection area between the first telescopic tube and each first cold tube, and between the second telescopic tube and each second cold tube, thereby improving the connection reliability.

[0018] (6) Welding the connecting sections of the first telescopic pipe to the corresponding first cold pipe and the connecting sections of the second telescopic pipe to the corresponding second cold pipe can help ensure the connection strength between the first telescopic pipe and each first cold pipe and between the second telescopic pipe and each second cold pipe, thereby improving the connection reliability.

[0019] (7) The expansion section in the first expansion tube and the expansion section in the second expansion tube are both made of corrugated pipe, which can not only compensate for displacement deviation, but also absorb vibration and reduce noise. Moreover, the product is mature and the cost is low.

[0020] (8) The second cooling structure includes a cold plate located at the bottom of each cell module, which can ensure the cooling effect of each cell module.

[0021] (9) The cooling pipe assembly and the cold plate are connected by a connecting pipe assembly, which can reduce the use of parts, reduce costs, and improve the overall compactness of the package.

[0022] This application also proposes an electrical device in which a battery pack as described above is provided.

[0023] The electrical device described in this application is equipped with the aforementioned battery pack, which has the same beneficial effects as conventional technology, and will not be described in detail here. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exploded view of the battery pack described in the embodiments of this application; Figure 2 This is a partial structural schematic diagram of the battery pack described in an embodiment of this application; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the cooling pipe assembly described in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the second telescopic tube described in an embodiment of this application; Explanation of reference numerals in the attached figures: 1. Battery cell module; 2. Cooling pipe assembly; 3. Telescopic pipe assembly; 4. Cold plate; 5. Connecting pipe; 6. Frame; 7. Top cover; 101. Battery cell; 102. Terminal post; 103. First electrode pad; 104. Second electrode pad; 201, First cooling pipe; 202, Second cooling pipe; 203, Manifold; 2031, Manifold connector; 300a, First telescopic pipe; 300b, Second telescopic pipe; 301, Telescopic section; 302, Connecting section; 401, First cold plate joint; 402, Second cold plate joint. Detailed Implementation

[0025] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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 connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0031] An embodiment of the first aspect of this application provides a battery pack that can improve overall pack safety and fast charging performance, thereby contributing to the improvement of overall pack quality.

[0032] In related technologies, the fast charging rate of current battery packs is getting higher and higher, and the heat generation of the terminals 102 and battery pads on the battery module is becoming more and more serious. In the cooling solutions for terminals 102 and battery pads, the cooling plate of the battery pad is usually fixed to the battery pad by adhesive. During the charge and discharge cycle of the battery cell 101, the battery cell 101 expands, and the battery pad will shift accordingly. In severe cases, the tear between the battery pad cooling plate and the battery pad will become larger and larger, the adhesive will be torn, resulting in failure, affecting the safety of the battery pack, and hindering the improvement of battery pack quality.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 6 As shown, the overall design includes a battery cell module 1 and a first cooling structure.

[0034] The battery cell module 1 comprises at least two cells arranged sequentially along the length of the battery pack. Each battery cell module 1 includes a plurality of cells 101 arranged sequentially, and a battery cell assembly connecting each cell 101. Furthermore, the first cooling structure includes cooling pipe groups 2 corresponding to and connected to each battery cell assembly. Adjacent cooling pipe groups 2 are connected by telescopic pipe groups 3, and the telescopic pipe groups 3 are capable of telescopic extension and retraction at least along the length of the battery pack.

[0035] Therefore, by connecting two adjacent cooling pipe groups 2 through telescopic pipes, and the telescopic pipe group 3 being able to extend and retract at least in the length direction of the battery pack, it can not only absorb the heat at the location of the battery cell 101 during the charge and discharge cycle, thus improving the fast charging performance of the entire pack, but also reduce the impact of the displacement of the battery cell 101 when it expands to a certain extent, preventing the battery cell 101 from separating from the cooling pipe group 2 and causing cooling failure, thereby improving the safety of the battery pack and thus contributing to the improvement of the overall quality of the pack.

[0036] Based on the above overall introduction, specifically, in this embodiment, the number of battery cell modules 1 can be set and adjusted according to the actual energy demand of the battery pack. For example, it can be four, and specifically, it can be two groups arranged at intervals in the width direction of the battery pack, and each group includes two cells arranged along the length direction of the battery pack.

[0037] Meanwhile, along the height direction of the battery pack, the terminal posts 102 of each cell 101 are located at the top, and each cell 101 is also provided with a cell explosion-proof valve at its top. Of course, any related structural parts not mentioned in this embodiment of the battery pack can refer to the various structures in battery pack products well known to those skilled in the art. For example, the battery pack also includes a lower shell and an upper cover 7, and each cell module 1 and the first cooling structure are all located in the cavity enclosed by the lower shell and the upper cover 7, etc., which will not be described in detail here.

[0038] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment will vary depending on the orientation of the battery pack; that is, the directions in this embodiment refer to a relative coordinate system based on the battery pack.

[0039] Continue to combine Figure 1 and Figure 2 As shown, in some exemplary embodiments, each battery pack assembly is disposed on top of its corresponding cell module 1 and includes a first battery pack unit and a second battery pack unit spaced apart along the width direction of the battery pack.

[0040] Furthermore, the cooling pipe assembly 2 includes a first cooling pipe 201 corresponding to and connected to the first bar unit 103, and a second cooling pipe 202 corresponding to and connected to the second bar unit 104. Meanwhile, the telescopic pipe assembly 3 includes a first telescopic pipe 300a connecting two adjacent first cooling pipes 201, and a second telescopic pipe 300b connecting two adjacent second cooling pipes 202.

[0041] It is understandable that the cooling pipe assembly 2 includes a first cooling pipe 201 corresponding to and connected to the first valve 103 unit and a second cooling pipe 202 corresponding to and connected to the second valve 104 unit. This avoids the explosion-proof valves of each battery cell 101 and prevents them from affecting the pressure relief when the explosion-proof valves of each battery cell 101 experience thermal runaway. At the same time, the telescopic pipe assembly 3 includes a first telescopic pipe 300a connecting two adjacent first cooling pipes 201 and a second telescopic pipe 300b connecting two adjacent second cooling pipes 202. The first telescopic pipe 300a and the second telescopic pipe 300b can be used to reduce the risk of cooling failure caused by the displacement of the first valve 103 unit and the second valve 104 unit when the battery cell 101 expands, thereby helping to ensure the safety of the entire package.

[0042] In specific implementation, in this embodiment, each battery cell 101 has a terminal post 102 located at both ends of the battery cell 101 along the length direction of the battery cell 101. One terminal post 102 is a negative terminal post 102 and the other terminal post 102 is a positive terminal post 102. The battery cell explosion-proof valve is located in the middle of the battery cell 101, that is, between the two terminal posts 102.

[0043] Meanwhile, the first strip 103 unit in this embodiment includes a plurality of first strips 103 arranged sequentially along the length direction of the battery pack, and the second strip 104 unit includes a plurality of second strips 104 arranged sequentially along the length direction of the battery pack. Both the first strips 103 and the second strips 104 are used to connect the positive terminal 102 and the negative terminal 102 of two adjacent cells 101, so that the cell module 1 can be connected in series or in series through the first strip 103 unit and the second strip 104 unit. For example, when connected in series, the first strips 103 and the second strips 104 are staggered in the width direction of the battery pack.

[0044] Continue to combine Figure 3 and Figure 4 As shown, in some exemplary embodiments, the first electrode 103 and its corresponding pole post 102, as well as the second electrode 104 and its corresponding pole post 102, can be welded together, and the first electrode 103 and its corresponding first cooling pipe 201, as well as the second electrode 104 and its corresponding second cooling pipe 202, can be connected by an adhesive layer. This adhesive layer can be made of a thermally conductive structural adhesive.

[0045] Furthermore, in the height direction of the battery pack, in each cooling pipe group 2, the projected outline of each first cooling pipe 201 and the first telescopic pipe 300a at least covers the corresponding first plate 103 unit, and the projected outline of each second cooling pipe 202 and the second telescopic pipe 300b at least covers the corresponding second plate 104 unit.

[0046] Among them, continue to combine Figures 1 to 3 As shown, in some of the exemplary embodiments, each of the first cooling pipes 201 and each of the second cooling pipes 202 in this embodiment can be a flat pipe to minimize the space occupied by the battery pack in the Z direction and ensure the overall energy density of the pack.

[0047] Continue to combine Figure 1 , Figure 2 and Figure 5 As shown, in some exemplary embodiments, the first cooling structure includes a manifold 203, with manifolds 203 provided at both ends of the battery pack along its length, and each first cooling pipe 201 and its corresponding second cooling pipe 202 are connected through the manifold 203 at the same end.

[0048] Here, each first cooling pipe 201 and its corresponding second cooling pipe 202 are connected through a manifold 203 at the same end, which can optimize the coolant flow path, reduce the difference in coolant flow rate between each first cooling pipe 201 and each second cooling pipe 202, improve the overall cooling efficiency, and at the same time simplify the structure, reduce the number and complexity of pipes, and reduce costs.

[0049] In specific implementations, in some exemplary embodiments, the manifold 203 has a rectangular cross-section to facilitate its connection with the first cold pipe 201 and the second cold pipe 202, and to minimize the space occupied by the battery pack in the Z direction, ensuring the overall energy density of the pack. If necessary, the manifold 203 can be a flat pipe similar to the first cold pipe 201 and the second cold pipe 202.

[0050] Moreover, in this embodiment, the combination is continued. Figure 1 and Figure 2 As shown in the example of a battery pack containing four cell modules 1, the first cooling structure includes four first cooling pipes 201, four second cooling pipes 202, two first telescopic pipes 300a, two second telescopic pipes 300b, and two current collectors 203. Specifically, each cell module 1 corresponds to one first cooling pipe 201 and one second cooling pipe 202. Along the length of the battery pack, each first telescopic pipe 300a is connected to its corresponding two first cooling pipes 201, and each second telescopic pipe 300b is connected to its corresponding two second cooling pipes 202. The two current collectors 203 are located at both ends of each cell module 1, and each current collector 203 is connected to the two first cooling pipes 201 and the two second cooling pipes 202 at the same end.

[0051] In addition, continue to combine Figure 4 and Figure 5 As shown, in some exemplary embodiments, both the first telescopic tube 300a and the second telescopic tube 300b include a telescopic section 301 and connecting sections 302 disposed at both ends of the telescopic section 301. This arrangement makes each telescopic tube simple in structure and easy to manufacture.

[0052] In some exemplary embodiments, each first cold pipe 201 is inserted into the connecting section 302 of its corresponding first telescopic pipe 300a, and each second cold pipe 202 is inserted into the connecting section 302 of its corresponding second telescopic pipe 300b. The advantage of this arrangement is that it improves the ease and reliability of connection between the first telescopic pipe 300a and each first cold pipe 201, and between the second telescopic pipe 300b and each second cold pipe 202.

[0053] Furthermore, continue to combine Figure 4 and Figure 5 As shown, in some of the exemplary embodiments, the length L1 of each connecting segment 302 in the first telescopic tube 300a in the battery pack length direction satisfies: L1≥3mm, and the length L2 of each connecting segment 302 in the second telescopic tube 300b in the battery pack length direction satisfies: L2≥3mm.

[0054] This ensures a better connection area between the first telescopic tube 300a and each of the first cold pipes 201, and between the second telescopic tube 300b and each of the second cold pipes 202, thereby improving connection reliability. In practice, L1 and L2 can be specifically set to 3mm, 4mm, or 5mm to ensure relatively superior connection reliability between the first telescopic tube 300a and each of the first cold pipes 201, and between the second telescopic tube 300b and each of the second cold pipes 202.

[0055] It should be noted that in this embodiment, the first telescopic tube 300a and the second telescopic tube 300b have the same structure, the only difference being their arrangement. Therefore, the length L1 of each connecting segment 302 in the first telescopic tube 300a can be referred to... Figure 4 A schematic diagram of the length L2 of each connecting segment 302 in the second telescopic tube 300b is shown. Meanwhile, the other structures of the first telescopic tube 300a can be referenced. Figure 6 The diagram shows the second telescopic tube 300b, and the lengths of the connecting sections 302 at both ends of the first telescopic tube 300a and the connecting sections 302 at both ends of the second telescopic tube 300b can be designed differently, such as... Figure 6 The varying lengths shown in the diagram have the advantage of allowing for improved stability of the first telescopic tube 300a and the second telescopic tube 300b during telescopic movement through differentiated design.

[0056] Furthermore, in some exemplary embodiments, each connecting segment 302 of the first telescopic tube 300a is welded to the corresponding first cold tube 201, and each connecting segment 302 of the second telescopic tube 300b is welded to the corresponding second cold tube 202.

[0057] This configuration helps to ensure the connection strength between the first telescopic tube 300a and each of the first cold pipes 201, and between the second telescopic tube 300b and each of the second cold pipes 202, thereby improving the connection reliability.

[0058] Furthermore, in some exemplary embodiments, the expansion section 301 in the first expansion tube 300a and the expansion section 301 in the second expansion tube 300b are both made of corrugated pipe. The main advantage of this arrangement is that it can compensate for displacement deviations, absorb vibrations and reduce noise, and the product is mature and inexpensive.

[0059] In addition, continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the battery pack of this embodiment further includes a second cooling structure, which includes a cold plate 4 disposed at the bottom of each cell module 1. By providing the cold plate 4, the cooling effect on each cell module 1 can be ensured.

[0060] In the battery pack of this embodiment, in some exemplary implementations, the lower housing includes a base plate and a frame 6. The base plate can be provided separately or can be directly made of the aforementioned cold plate 4. The upper cover 7 is connected to the frame 6. In a specific implementation of this embodiment, the base plate is made of the aforementioned cold plate 4, and each cell module 1 can be bonded to the cold plate 4 with thermally conductive structural adhesive.

[0061] In some exemplary embodiments, the cooling pipe assembly 2 and the cold plate 4 are connected by a connecting pipe assembly. This reduces the number of components used, lowers costs, and improves the overall package compactness.

[0062] In specific implementations, in some exemplary embodiments, the cold plate 4 is provided with a first cold plate connector 401 and a second cold plate connector 402 at both ends along the length of the battery pack, and each of the two manifolds 203 is provided with a manifold connector 2031. The connecting pipe group includes two connecting pipes 5, one of which connects one manifold connector 2031 and the first cold plate connector 401, and the other connecting pipe 5 connects the other manifold connector 2031 and the second cold plate connector 402, thereby realizing the parallel arrangement of the first cooling structure and the second cooling structure.

[0063] Of course, any related structural parts not mentioned in the cold plate 4 of this embodiment can refer to the cold plate structure known to those skilled in the art, such as having an inlet connector and an outlet connector, etc., which will not be described in detail here.

[0064] It is worth noting that, regarding the battery pack of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 6 As shown, it may include, for example, a cell module 1 and a first cooling structure.

[0065] Among them, there are at least two battery cell modules 1 arranged sequentially along the length of the battery pack. Each battery cell module 1 includes a number of battery cells 101 arranged sequentially, and a battery cell assembly connecting each battery cell 101. The first cooling structure includes a cooling pipe group 2 corresponding to and connected to each battery cell assembly. Two adjacent cooling pipe groups 2 are connected by a telescopic pipe group 3, and the telescopic pipe group 3 can extend and retract at least in the length of the battery pack.

[0066] Each battery pack assembly is located on top of its corresponding cell module 1 and includes a first battery pack assembly 103 and a second battery pack assembly 104 arranged at intervals along the width of the battery pack. In each cell module 1, the cooling pipe group 2 includes a first cooling pipe 201 corresponding to and connected to the first battery pack assembly 103 and a second cooling pipe 202 corresponding to and connected to the second battery pack assembly 104. The telescopic pipe group 3 includes a first telescopic pipe 300a connecting two adjacent first cooling pipes 201 and a second telescopic pipe 300b connecting two adjacent second cooling pipes 202.

[0067] The first cooling structure includes a manifold 203. Manifolds 203 are provided at both ends of the battery pack along its length, and each first cooling pipe 201 and its corresponding second cooling pipe 202 are connected through the manifold 203 at the same end.

[0068] The first telescopic tube 300a and the second telescopic tube 300b each include a telescopic section 301 and connecting sections 302 located at both ends of the telescopic section 301. Each first cooling pipe 201 is inserted into the corresponding connecting section 302 of the first telescopic tube 300a, and each second cooling pipe 202 is inserted into the corresponding connecting section 302 of the second telescopic tube 300b. Along the length of the battery pack, the length L1 of each connecting section 302 in the first telescopic tube 300a satisfies: L1≥3mm, and the length L2 of each connecting section 302 in the second telescopic tube 300b satisfies: L2≥3mm. Each connecting section 302 of the first telescopic tube 300a is welded to its corresponding first cooling pipe 201, and each connecting section 302 of the second telescopic tube 300b is welded to its corresponding second cooling pipe 202.

[0069] The expansion section 301 in the first expansion tube 300a and the expansion section 301 in the second expansion tube 300b are both made of corrugated pipe.

[0070] It also includes a second cooling structure, which includes a cold plate 4 located at the bottom of each cell module 1, and the cooling pipe group 2 and the cold plate 4 are connected by a connecting pipe group 5.

[0071] In the preferred embodiment of the battery pack above, the specific configuration and arrangement of the cell module 1, cooling pipe group 2, telescopic pipe group 3, etc. can still be referred to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cell module 1, cooling pipe group 2, and telescopic pipe group 3, etc., can also be referred to the description in the above exemplary embodiments.

[0072] The battery pack of this embodiment adopts the above design, which can not only absorb the heat of the diaphragm assembly during the charging and discharging cycle of the cell 101 and improve the fast charging performance of the whole pack, but also reduce the impact of the displacement of the diaphragm assembly when the cell 101 expands to a certain extent, and prevent the diaphragm assembly from separating from the cooling pipe group 2, thus causing cooling failure, thereby improving the safety performance of the battery pack.

[0073] An embodiment of the second aspect of this application provides an electrical device that includes the battery pack described in the embodiment of the first aspect of this application.

[0074] By incorporating the battery pack found in the first aspect of this application, the overall structural stability of the electrical device can be improved, thereby enhancing the overall performance of the device.

[0075] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery pack, characterized in that: Includes the battery cell module and the first cooling structure; The cell module comprises at least two cells arranged sequentially along the length of the battery pack. Each cell module includes a plurality of cells arranged sequentially and a battery cell assembly connecting each cell. The first cooling structure includes cooling pipe groups corresponding to and connected to each of the battery pack components. Adjacent cooling pipe groups are connected by telescopic pipe groups, and the telescopic pipe groups are at least able to extend and retract in the length direction of the battery pack.

2. The battery pack according to claim 1, characterized in that: Each of the aforementioned pad assembly is disposed on the top of the corresponding cell module, and includes a first pad unit and a second pad unit arranged at intervals along the width direction of the battery pack; The cooling pipe assembly includes a first cooling pipe corresponding to and connected to the first bar plate unit, and a second cooling pipe corresponding to and connected to the second bar plate unit. The telescopic tube assembly includes a first telescopic tube connecting two adjacent first cold pipes and a second telescopic tube connecting two adjacent second cold pipes.

3. The battery pack according to claim 2, characterized in that: The first cooling structure includes a manifold, and the manifold is provided at both ends of the battery pack along its length. Each of the first cooling pipes and the corresponding second cooling pipes are connected through the manifold at the same end.

4. The battery pack according to claim 2, characterized in that: Both the first telescopic tube and the second telescopic tube include telescopic sections and connecting sections disposed at both ends of the telescopic sections; Each of the first cold pipes is inserted into the connecting section of the corresponding first telescopic pipe, and / or each of the second cold pipes is inserted into the connecting section of the corresponding second telescopic pipe.

5. The battery pack according to claim 4, characterized in that: Along the length of the battery pack, the length L1 of each connecting segment in the first telescopic tube satisfies: L1 ≥ 3 mm; and / or, In the length direction of the battery pack, the length L2 of each connecting segment in the second telescopic tube satisfies: L2≥3mm.

6. The battery pack according to claim 4, characterized in that: The connecting sections of the first telescopic tube are welded together with their corresponding first cold pipes; and / or, The connecting sections of the second telescopic tube are welded together with their corresponding second cold tubes.

7. The battery pack according to claim 4, characterized in that: The telescopic section in the first telescopic tube and / or the telescopic section in the second telescopic tube are made of corrugated pipe.

8. The battery pack according to any one of claims 2 to 7, characterized in that: It also includes a second cooling structure; The second cooling structure includes a cold plate disposed at the bottom of each of the battery cell modules.

9. The battery pack according to claim 8, characterized in that: The cooling pipe assembly and the cold plate are connected by a connecting pipe assembly.

10. An electrical device, characterized in that: The electrical device is provided with a battery pack as described in any one of claims 1 to 9.

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