Battery pack and energy storage system

Abstract

The application relates to the technical field of battery manufacturing, and provides a battery pack and an energy storage system. The battery pack disclosed by the application comprises at least two layers of cell modules stacked in an up-down mode; each cell module comprises a frame, a bottom cold plate arranged at the bottom of the frame, and a cell group arranged in a cavity formed by the bottom cold plate and the frame; two adjacent cell modules in an up-down mode are connected through a connecting assembly; the cell group of the cell module located at the lower layer is in abutment with the bottom cold plate of the cell module located at the upper layer; and the top of the cell module located at the uppermost layer is provided with a top cold plate. The battery pack disclosed by the application optimizes the structural design of the battery pack and is beneficial to improving the use quality of the battery pack.

Description

Technical Field

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

[0002] With the development of the new energy industry, energy storage systems are widely used in scenarios such as smoothing power generation fluctuations and grid peak shaving. As the core unit of the energy storage system, the structural design of the battery pack directly affects the space utilization, energy density and overall performance of the energy storage system.

[0003] Currently, most common battery packs are single-layer module designs, with modules arranged horizontally in a single layer. Cold plates are placed on the top or bottom of the modules, and the structure is relatively complex. When multiple battery packs are arranged in an energy storage system, the structures of the battery packs affect each other, occupying space in the energy storage system and limiting the energy density of the energy storage system, which is not conducive to improving the quality of battery pack use. Utility Model Content

[0004] In view of this, the present application aims to provide a battery pack that improves the quality of battery pack use.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery pack comprising at least two layers of cell modules stacked vertically; Each of the battery cell modules includes a frame, a bottom cold plate disposed at the bottom of the frame, and a battery cell assembly disposed within a cavity formed by the bottom cold plate and the frame. The frames of two adjacent battery cell modules are connected by a connecting component. The battery cell group of the lower battery cell module abuts against the bottom cold plate of the upper battery cell module, and the top of the uppermost battery cell module is provided with a top cold plate.

[0006] Furthermore, the connection component includes at least one connector connecting two adjacent layers of the battery cell modules; both ends of each connector can be detachably mounted on the corresponding frame.

[0007] Furthermore, the connecting component also includes at least one positioning element disposed on the frame; the bottom cold plate is provided with a positioning mating hole, and the positioning element is inserted into the positioning mating hole accordingly.

[0008] Furthermore, a roller assembly is provided at the bottom of the lowest layer of the battery cell module; the roller assembly includes a support member connected to the frame and a plurality of rotating members spaced apart on the support member along the length direction of the battery cell module.

[0009] Furthermore, the cell groups of two adjacent cell modules are connected by a conductive busbar, and the support member has an extended end that extends out of the frame along the length direction of the cell module; the protrusion dimension a of the conductive busbar relative to the frame along the length direction of the cell module satisfies the following relationship between b ≥ a.

[0010] Furthermore, the frame includes a front end plate and a rear end plate spaced apart along the length of the cell module, and a connecting beam disposed between the front end plate and the rear end plate; the bottom of the front end plate, the rear end plate and the connecting beam forms a mounting groove for mounting the bottom cold plate.

[0011] Furthermore, a heat-conducting layer is provided on the top of the lower cell module, and the heat-conducting layer abuts against the bottom cold plate of the upper cell module.

[0012] Furthermore, it also includes electrical components disposed on the battery cell module; the electrical components include at least one of a battery management unit, a transfer harness, and a fuse.

[0013] Furthermore, each of the battery cell groups includes a plurality of battery cells stacked along the length direction of the battery cell module; the output electrodes at the same end of the battery cell located on the upper layer are opposite to those of the battery cell located on the lower layer.

[0014] Compared with related technologies, this application has the following advantages: (1) The battery pack described in this application improves the space utilization of the battery pack by setting at least two layers of stacked cell modules, realizes a compact design, and is conducive to improving the energy density of the battery pack. The frame and the bottom cold plate cooperate to form a cavity to accommodate the cell group. The structure is simple and conducive to the lightweight design of the battery pack. The cell group located in the lower layer directly abuts the bottom cold plate of the cell module located in the upper layer, which improves the cooling effect, improves the overall performance and service life of the battery pack, and is conducive to improving the quality of use of the battery pack.

[0015] (2) It can be detachably connected to the frame through the connector, which facilitates the assembly of the upper and lower battery cell modules. The connection stability of the upper and lower battery cell modules is ensured by the setting of the connector. The structure is simple, the connection is stable, and it is easy to assemble and maintain.

[0016] (3) The positioning of the upper and lower battery cell modules is facilitated by the setting of positioning parts and positioning mating holes, which reduces assembly errors and helps the assembly of connecting parts. The structure is simple and easy to design and implement.

[0017] (4) The roller assembly can support the cell module and facilitate the movement of the battery pack along the length of the cell module, making it easy to assemble and adjust the position of the battery pack. The structure is simple and easy to design and implement.

[0018] (5) By making the length of the extended end of the support greater than the protrusion of the conductive busbar, it helps to effectively protect the conductive busbar, avoid collision damage to the conductive busbar, improve the connection reliability of the conductive busbar, and facilitate design and implementation.

[0019] (6) By making the frame consist of a front end plate, a rear end plate and a connecting beam, the structure is simple and the overall structural strength of the frame is ensured. The installation groove facilitates the assembly of the bottom cold plate. The overall frame structure is conducive to the lightweight design of the battery pack.

[0020] (7) By setting the heat-conducting layer, heat transfer between the upper and lower cell modules is facilitated, and the bottom cold plate of the upper cell module cools the top of the lower cell module. The structure is compact, making full use of the cooling performance of the cold plate, optimizing the cooling effect of the battery pack, and facilitating design and implementation.

[0021] (8) By placing the electrical components on the cell module, it is easier to connect the electrical components to the cell module and to assemble the electrical components, which is helpful for design implementation.

[0022] (9) By making the output electrodes of each cell in the two adjacent layers opposite, it is easy to realize the series connection of the two-layer cell modules. The structure is simple and easy to design and implement.

[0023] This application also proposes an energy storage system, including the battery pack described above.

[0024] The energy storage system described in this application, through the battery pack configuration as described above, has the same beneficial effects as the battery pack described above compared to related technologies, and therefore will not be described in detail here. Attached Figure Description

[0025] 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 a schematic diagram of the battery pack from a first angle according to an embodiment of this application; Figure 2 This is a schematic diagram of the battery pack from a second angle according to an embodiment of this application; Figure 3 This is a partial structural diagram of the battery pack described in an embodiment of this application; Figure 4 This is a schematic diagram of the battery cell module described in an embodiment of this application; Figure 5 This is a schematic diagram of the frame structure described in an embodiment of this application; Figure 6 for Figure 2 Enlarged view of point A; Figure 7 This is a schematic diagram of the roller assembly described in an embodiment of this application; Figure 8 This is a cross-sectional view of the roller assembly described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Battery cell module; 101. Border; 1011. Front end plate; 1012. Rear end plate; 1013. Connecting beam; 102. Bottom cold plate; 1021. Positioning mating hole; 103. Battery cell assembly; 2. Connecting components; 201. Connector; 202. Positioning component; 3. Top cold plate; 4. Roller assembly; 401. Support component; 402. Rotating component; 5. Conductive busbar; 6. Thermal conductive layer; 7. Electrical components; 701. Battery Management Unit; 702. Adapter Harness; 703. Fuse. Detailed Implementation

[0026] 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.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] An embodiment of the first aspect of this application provides a battery pack for use in an energy storage system, primarily as an energy storage unit. Furthermore, the battery pack in this embodiment, through its innovative structural design, optimizes the structure of the battery pack, thereby helping to improve the quality of use of the battery pack.

[0033] In related technologies, with the development of the new energy industry, energy storage systems are widely used in scenarios such as smoothing power generation fluctuations and grid peak shaving. As the core unit of the energy storage system, the structural design of the battery pack directly affects the space utilization, energy density and overall performance of the energy storage system.

[0034] Currently, most common battery packs are single-layer module designs, with modules arranged horizontally in a single layer. Cold plates are placed on the top or bottom of the modules, and the structure is relatively complex. When multiple battery packs are arranged in an energy storage system, the structures of the battery packs affect each other, occupying space in the energy storage system and limiting the energy density of the energy storage system, which is not conducive to improving the quality of battery pack use.

[0035] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 4 As shown, the overall design includes at least two layers of battery cell modules 1 stacked on top of each other.

[0036] Each battery cell module 1 includes a frame 101, a bottom cold plate 102 located at the bottom of the frame 101, and a battery cell assembly 103 located within the cavity formed by the bottom cold plate 102 and the frame 101. The frames 101 of two adjacent battery cell modules 1 are connected by a connecting component 2. The battery cell assembly 103 of the lower battery cell module 1 abuts against the bottom cold plate 102 of the upper battery cell module 1, and a top cold plate 3 is provided on the top of the uppermost battery cell module 1.

[0037] Therefore, by setting up at least two layers of stacked cell modules 1, the space utilization of the battery pack is improved, a compact design is achieved, and the energy density of the battery pack is improved. The frame 101 and the bottom cold plate cooperate to form a cavity to accommodate the cell assembly 103. The structure is simple and conducive to the lightweight design of the battery pack. Moreover, the cell assembly 103 located in the lower layer directly abuts against the bottom cold plate 102 of the cell module 1 located in the upper layer, which improves the cooling effect, enhances the overall performance and service life of the battery pack, and helps to improve the quality of use of the battery pack.

[0038] Based on the above general introduction, specifically, the battery pack of this embodiment generally includes a cell module 1.

[0039] Each of the above-mentioned cell modules 1 includes a frame 101, a bottom cold plate 102, and a cell assembly 103. The frame 101 can be made of a profile (such as an extruded aluminum profile), and the bottom cold plate 102 can refer to the cold plate structure in existing battery packs, which will not be described in detail here.

[0040] The above-mentioned cell group 103 can also draw on the structural design of the existing cell group 103 in the battery pack, such as stacking multiple cells with their large surfaces facing each other in sequence, and connecting the terminals of each cell in sequence according to the design requirements of the battery pack, which will not be elaborated here.

[0041] Continue to combine Figures 1 to 8 As shown, in some exemplary embodiments, this embodiment may, for example, include a connection component 2 including at least one connector 201 connecting two adjacent battery cell modules 1, with both ends of each connector 201 detachably disposed on the corresponding frame 101.

[0042] It is understandable that the connector 201 can be detachably connected to the frame 101, which facilitates the assembly of the upper and lower battery cell modules 1. The connector 201 also ensures the connection stability of the upper and lower battery cell modules 1. The structure is simple, the connection is stable, and it is easy to assemble and maintain.

[0043] In specific implementation, the connector 201 may be in the form of a rectangular plate structure. The connector 201 is detachably assembled to the frame 101 by bolts. The two connectors 201 are respectively assembled on the front and rear sides of the frame 101, and the upper end of each connector 201 is connected to the bottom of the upper battery cell module 1, and the lower end of each connector 201 is connected to the top of the lower battery cell module 1.

[0044] Continue to combine Figures 1 to 2 As shown, in some exemplary embodiments, the connecting component 2 includes a connector 201 as an example. In this embodiment, the connecting component 2 may also include at least one positioning member 202 provided on the frame 101. The bottom plate cold plate is provided with a positioning mating hole 1021, and the positioning member 202 is inserted into the positioning mating hole 1021.

[0045] It is understandable that the positioning component 202 and the positioning mating hole 1021 facilitate the positioning of the upper and lower battery cell modules 1 during assembly, reduce assembly errors, and help with the assembly of the connector 201. The structure is simple and easy to design and implement.

[0046] In specific implementation, the above positioning component 202 can be, for example, a positioning pin. The two positioning components 202 are located on the top of the frame 101. Along the thickness direction of the cell module 1, the projections of the two positioning pins are located at the diagonal positions of the projection of the frame 101. When assembling each layer of cell module 1, the positioning pins are first inserted into the corresponding positioning mating holes 1021, and then the connecting component 201 is assembled on the frame 101.

[0047] Continue to combine Figures 1 to 8 As shown, in some exemplary embodiments, this embodiment may, for example, have a roller assembly 4 at the bottom of the lower cell module 1.

[0048] The roller assembly 4 includes a support member 401 connected to the frame 101, and a plurality of rotating members 402 spaced along the length of the battery cell module 1 on the support member 401.

[0049] It is understandable that the roller assembly 4 can support the cell module 1 and facilitate the movement of the battery pack along the length of the cell module 1, making it easy to assemble and adjust the position of the battery pack. The structure is simple and easy to design and implement.

[0050] In a specific implementation, the support member 401 is provided with multiple through holes spaced apart, and a rotating shaft passes through each through hole. The rotating member 402 can be, for example, a bearing. The inner ring of the bearing is fixed on the rotating shaft. When the battery pack in this embodiment is installed in the energy storage system, the supporting structure in the energy storage system for supporting the battery pack can be provided with fixing grooves corresponding to the setting positions of each rotating member 402. When the battery is assembled on the supporting structure, each rotating member 402 is located in its corresponding fixing groove.

[0051] Continue to combine Figures 1 to 8 As shown, in some exemplary embodiments, taking the example of a roller assembly 4 on the bottommost cell module 1, this embodiment allows the cell groups 103 of two adjacent cell modules 1 to be connected by a conductive busbar 5, and the support member 401 has an extended end that extends out of the frame 101 along the length direction of the cell module 1.

[0052] Among them, the protrusion dimension a of the conductive busbar 5 relative to the frame 101 along the length direction of the battery module 1 and the length b of the protruding end satisfy the following condition: b≥a.

[0053] Understandably, by making the protruding end of the support member 401 longer than the protruding dimension of the conductive busbar 5, it helps to effectively protect the conductive busbar 5, avoid collision damage to the conductive busbar 5, improve the connection reliability of the conductive busbar 5, and facilitate design and implementation.

[0054] In specific implementation, the conductive busbar 5 mentioned above can be based on the conductive busbar 5 in the existing battery pack (such as copper busbar, etc.), and will not be described in detail here. The side of the conductive busbar 5 near the frame 101 can be set close to the frame 101 to further optimize the space occupied by the battery pack in the length direction of the cell module 1, which helps to reduce the space occupied by the battery pack in the energy storage system and make the structure of the energy storage system more compact.

[0055] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, this embodiment may, for example, make the frame 101 include a front end plate 1011, a rear end plate 1012, and a connecting beam 1013.

[0056] The front-end plate 1011 and the rear-end plate 1012 are spaced apart along the length of the cell module 1. The connecting beam 1013 is connected between the front-end plate 1011 and the rear-end plate 1012. The bottom enclosure of the front-end plate 1011, the rear-end plate 1012 and the connecting beam 1013 forms an installation groove for mounting the bottom cold plate 102.

[0057] It is understandable that by making the frame 101 consist of a front end plate 1011, a rear end plate 1012 and a connecting beam 1013, the structure is simple and the overall structural strength of the frame 101 is ensured. In addition, the setting of the mounting groove facilitates the assembly of the bottom cold plate 102. The overall frame structure is conducive to the lightweight design of the battery pack.

[0058] In specific implementation, two connecting beams 1013 are connected between the front end plate 1011 and the rear end plate 1012. The two connecting beams 1013 are arranged opposite to each other, and the ends of each connecting beam 1013 are connected to the front end plate 1011 and the rear end plate 1012 on the corresponding side and welded together. The bottom cold plate 102 can be assembled in the mounting groove, for example, by using a pop rivet.

[0059] Of course, the connection methods of the front end plate 1011, the rear end plate 1012 and the connecting beam 1013, as well as the fixing method of the bottom cold plate 102 in the mounting groove, can all be referenced from the connection and fixing methods of the relevant structures in the existing battery pack, except for the above-mentioned forms, and will not be elaborated here.

[0060] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, have a heat-conducting layer 6 on top of the lower cell module 1, which abuts against the bottom cold plate 102 of the upper cell module 1.

[0061] It is understandable that by setting up the heat-conducting layer 6, heat transfer between the upper and lower battery cell modules 1 is facilitated, and the bottom cold plate 102 of the upper battery cell module 1 is used to cool the top of the lower battery cell module 1. The structure is compact, makes full use of the cooling performance of the cold plate, optimizes the cooling effect of the battery pack, and is conducive to design and implementation.

[0062] In specific implementation, the above thermal conductive layer 6 can be, for example, a thermally conductive gel with low viscosity, to facilitate the assembly and disassembly of the upper and lower battery cell modules 1. Of course, in addition to thermally conductive gel, the above thermal conductive layer 6 can also refer to other thermal conductive layer 6 structures in existing battery packs, which will not be elaborated here.

[0063] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, include an electrical component 7 on the cell module 1.

[0064] The electrical component 7 includes at least one of a battery management unit 701, a transfer harness 702, and a fuse 703.

[0065] It is understandable that by placing the electrical component 7 on the cell module 1, it is easier to connect the electrical component 7 to the cell module 1 and to assemble the electrical component 7, which is helpful for design implementation.

[0066] In specific implementation, the battery management unit 701 can be, for example, a BMS or a BMU. Each layer of cell module 1 can be equipped with a corresponding battery management unit 701 and a transfer harness 702. The fuse 703 can be set on the corresponding cell module 1 according to the design requirements.

[0067] Continue to combine Figures 1 to 8 As shown, in some exemplary embodiments, this embodiment may, for example, include each cell group 103 comprising a plurality of cells stacked along the length of the cell module 1.

[0068] In this case, the output electrodes at the same end of the upper battery cell are opposite to those of the lower battery cell.

[0069] It is understandable that by making the output electrodes of the cells in the two adjacent layers opposite, it is easy to realize the series connection of the two-layer cell module 1, which has a simple structure and is easy to design and implement.

[0070] In specific implementation, for example, if the stacking order of the upper-layer cell module 1 is positive-negative-positive-negative, then the stacking order of the lower-layer cell module 1 is negative-positive-negative-positive. In other words, the total positive output terminal of the upper-layer cell module 1 is set to correspond to the total negative output terminal of the lower-layer cell module 1.

[0071] 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 8 As shown, it may include, for example, two layers of battery cell modules 1 stacked one on top of the other.

[0072] Each battery cell module 1 includes a frame 101, a bottom cold plate 102 located at the bottom of the frame 101, and a battery cell assembly 103 located within the cavity formed by the bottom cold plate 102 and the frame 101. The frames 101 of two adjacent battery cell modules 1 are connected by a connecting component 2. The battery cell assembly 103 of the lower battery cell module 1 abuts against the bottom cold plate 102 of the upper battery cell module 1, and a top cold plate 3 is provided on the top of the upper battery cell module 1.

[0073] The connecting component 2 includes two connectors 201 respectively located at the front and rear ends of the two battery cell modules 1. The two connectors 201 are detachably assembled on the frame 101 by bolts. The connecting component 2 also includes a positioning pin located at the top of the frame 101. The bottom cold plate 102 of the upper battery cell module 1 is provided with a positioning mating hole 1021, and the positioning pin passes through the positioning mating hole 1021.

[0074] Among them, the bottom of the lower cell module 1 is provided with a roller assembly 4. The roller assembly 4 includes a support member 401 that is connected to the frame 101 and extends along the length direction of the cell module 1, and a plurality of rotating members 402 that are spaced along the length direction of the cell module 1 on the support member 401.

[0075] In this configuration, the cell groups 103 of two adjacent cell modules 1 are connected by conductive busbars 5, and the support member 401 has an extended end that extends out of the frame 101 along the length direction of the cell module 1. The protrusion dimension a of the conductive busbar 5 relative to the frame 101 along the length direction of the cell module 1 satisfies the condition that b > a. The cell module 1 is provided with an electrical component 7, which includes a battery management unit 701, a transfer harness 702, and a fuse 703.

[0076] The frame 101 includes a front end plate 1011 and a rear end plate 1012 spaced apart along the length of the cell module 1, and a connecting beam 1013 disposed between the front end plate 1011 and the rear end plate 1012. The bottom of the front end plate 1011, the rear end plate 1012, and the connecting beam 1013 forms a mounting groove for mounting the bottom cold plate 102. A heat-conducting layer 6 is provided on the top of the lower cell module 1, and the heat-conducting layer 6 abuts against the bottom cold plate 102 of the upper cell module 1. The output electrodes of the cells in the upper cell group 103 are opposite to those of the cells in the lower cell group 103.

[0077] In the preferred embodiment of the battery pack above, the specific settings and arrangements of the cell module 1, frame 101, cell group 103, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cell module 1, frame 101, cell group 103, etc. can also be referred to the descriptions in the above exemplary embodiments.

[0078] The battery pack of this embodiment adopts the above design. By setting at least two layers of stacked cell modules 1, the space utilization of the battery pack is improved, a compact design is achieved, and the energy density of the battery pack is improved. The frame 101 and the bottom cold plate cooperate to form a cavity to accommodate the cell assembly 103. The structure is simple and conducive to the lightweight design of the battery pack. Moreover, the cell assembly 103 located in the lower layer directly abuts against the bottom cold plate 102 of the cell module 1 located in the upper layer, which improves the cooling effect, improves the overall performance and service life of the battery pack, and thus improves the quality of use of the battery pack.

[0079] An embodiment of the second aspect of this application provides an energy storage system including a battery pack as described above.

[0080] In the energy storage system of this embodiment, the battery pack is connected to the relevant structures in the energy storage system as an energy storage unit. The connection form between the battery pack and the relevant structures in the energy storage system can be referred to the connection form between the battery pack and the relevant structures in the existing energy storage system, and will not be described in detail here.

[0081] The energy storage system of this embodiment, through the battery pack configuration described above, can make the structure of the energy storage system more compact, thereby improving the energy density of the energy storage system. Furthermore, the improved performance of the battery pack helps to enhance the overall performance of the energy storage system.

[0082] 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 at least two layers of battery cell modules stacked on top of each other; Each of the battery cell modules includes a frame, a bottom cold plate disposed at the bottom of the frame, and a battery cell assembly disposed within a cavity formed by the bottom cold plate and the frame. The frames of two adjacent battery cell modules are connected by a connecting component. The battery cell group of the lower battery cell module abuts against the bottom cold plate of the upper battery cell module, and the top of the uppermost battery cell module is provided with a top cold plate.

2. The battery pack according to claim 1, characterized in that: The connection component includes at least one connector that connects two adjacent layers of the battery cell modules; Both ends of each connector can be detachably mounted on the corresponding frame.

3. The battery pack according to claim 2, characterized in that: The connecting component further includes at least one positioning element disposed on the frame; The bottom cold plate is provided with positioning and mating holes, and the positioning component is inserted into the positioning and mating holes accordingly.

4. The battery pack according to claim 1, characterized in that: A roller assembly is provided at the bottom of the lowest layer of the battery cell module; The roller assembly includes a support member connected to the frame and a plurality of rotating members spaced apart on the support member along the length of the battery cell module.

5. The battery pack according to claim 4, characterized in that: The battery cells of two adjacent battery cell modules are connected by a conductive busbar, and the support has an extended end that extends out of the frame along the length of the battery cell module; The protrusion dimension a of the conductive busbar relative to the frame along the length direction of the battery cell module satisfies the following relationship between the length b of the protruding end and b: b ≥ a.

6. The battery pack according to claim 1, characterized in that: The frame includes a front end plate and a rear end plate spaced apart along the length of the battery cell module, and a connecting beam disposed between the front end plate and the rear end plate; The bottom enclosure of the front end plate, the rear end plate, and the connecting beam forms an installation groove for mounting the bottom cold plate.

7. The battery pack according to claim 1, characterized in that: A heat-conducting layer is provided on the top of the lower cell module, and the heat-conducting layer abuts against the bottom cold plate of the upper cell module.

8. The battery pack according to claim 1, characterized in that: It also includes electrical components disposed on the battery cell module; The electrical components include at least one of a battery management unit, a junction box, and a fuse.

9. The battery pack according to any one of claims 1-8, characterized in that: Each of the aforementioned cell groups includes a plurality of cells stacked along the length direction of the cell module; The output electrodes at the same end of the upper battery cell are opposite to those at the lower battery cell.

10. An energy storage system, characterized in that: The battery pack includes any one of claims 1-9.

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