Battery pack

Abstract

This application relates to a battery pack comprising: a housing having a receiving cavity; at least one battery module located within the receiving cavity, the battery module comprising multiple battery cells stacked along the X and Z directions to form a double-layer, double-row structure; and a liquid cooling assembly comprising a first liquid cooling plate and a second liquid cooling plate interleaved with each other, the first liquid cooling plate extending along the X direction and disposed between the double-layer battery cells, and the second liquid cooling plate extending along the Z direction and disposed between the double-row battery cells, such that the coolant flowing within the first and second liquid cooling plates cools two adjacent sides of the battery cells. This battery pack enables the coolant within the first and second liquid cooling plates to simultaneously cool two adjacent sides of the battery cells, improving heat dissipation efficiency, thereby ensuring the safety of the battery cells and extending their service life.

Description

Technical Field

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

[0002] Horizontal cell design typically refers to a design where the cell is laid flat inside the battery pack. The biggest advantage of horizontal cell design is its high space utilization and improved volumetric energy density.

[0003] However, for horizontally oriented battery cells, cooling is generally done on one side only, which has limited heat exchange capacity. Especially for charging and discharging at 4C or higher, the heat cannot be dissipated quickly, resulting in the battery temperature exceeding the battery's limit temperature, affecting the cell's lifespan and safety. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery pack to solve at least one problem existing in the background art.

[0005] In a first aspect, embodiments of this application provide a battery pack, the battery pack comprising:

[0006] The enclosure has a receiving cavity;

[0007] At least one battery module is located in the accommodating cavity. The battery module includes multiple battery cells, which are stacked along the X and Z directions to form a double-layer double-row structure.

[0008] The liquid cooling assembly includes a first liquid cooling plate and a second liquid cooling plate that are interleaved. The first liquid cooling plate extends along the X direction and is disposed between two layers of the battery cells, and the second liquid cooling plate extends along the Z direction and is disposed between two rows of the battery cells, so that the coolant flowing in the first liquid cooling plate and the second liquid cooling plate cools two adjacent sides of the battery cells; wherein, the X direction is the width direction of the battery module, and the Z direction is the height direction of the battery module.

[0009] In conjunction with the first aspect of this application, in an optional embodiment, the second liquid cooling plate is inserted into the first liquid cooling plate, and the first liquid cooling plate is perpendicular to the second liquid cooling plate;

[0010] The first liquid cooling plate has a through hole for the second liquid cooling plate to pass through, and the through hole extends along the Y direction.

[0011] In conjunction with the first aspect of this application, in an optional embodiment, the liquid cooling assembly further includes a first current collector, a second current collector, a third current collector, and a fourth current collector, wherein the first current collector and the second current collector are perpendicularly connected to each other, and the third current collector and the fourth current collector are perpendicularly connected to each other.

[0012] The second current collector and the fourth current collector are respectively connected to both ends of the first liquid cooling plate along the Y direction, and both are connected to the multiple first liquid cooling channels provided on the first liquid cooling plate;

[0013] The first current collector and the third current collector are respectively connected to both ends of the second liquid cooling plate along the Y direction, and both are connected to the multiple second liquid cooling channels provided on the second liquid cooling plate.

[0014] In conjunction with the first aspect of this application, in an optional embodiment, the plurality of first liquid cooling channels provided on the first liquid cooling plate and the plurality of second liquid cooling channels provided on the second liquid cooling plate both extend along the Y direction, and the first liquid cooling channels and the second liquid cooling channels are not in communication.

[0015] In conjunction with the first aspect of this application, in an optional embodiment, the first manifold has a first liquid inlet, and the third manifold has a first liquid outlet. Coolant flows into a plurality of second liquid cooling channels through the first liquid inlet and is discharged from the first liquid outlet.

[0016] The second manifold has a second liquid inlet, and the fourth manifold has a second liquid outlet. Coolant flows into multiple first liquid cooling channels through the second liquid inlet and is discharged from the second liquid outlet.

[0017] In conjunction with the first aspect of this application, in an optional embodiment, the first liquid inlet and the first liquid outlet are respectively diagonally opposite to the second liquid cooling plate, and the first liquid inlet is higher than the first liquid outlet along the Z direction;

[0018] The second liquid inlet and the second liquid outlet are respectively located diagonally opposite to the first liquid cooling plate.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the first liquid cooling plate is provided with a first reinforcing portion at the position corresponding to the through hole, and the first reinforcing portion surrounds the periphery of the through hole; the second liquid cooling plate passes through the through hole along the Z direction and is provided with a second reinforcing portion at the position corresponding to the through hole, and the second reinforcing portion extends along the Y direction.

[0020] In conjunction with the first aspect of this application, in an optional embodiment, adjacent second liquid cooling channels are separated by a second connecting rib, the second connecting rib being a rectangular structure; adjacent first liquid cooling channels are separated by a first connecting rib, the first connecting rib having a C-shaped cross-section.

[0021] In conjunction with the first aspect of this application, in an optional embodiment, the first current collector, the second current collector, the third current collector, and the fourth current collector are all provided with limiting bosses, which are used to limit the positions of the first liquid cooling plate and the second liquid cooling plate respectively inserted into the second current collector and the first current collector.

[0022] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0023] The first fixing plate has one end connected to the first current collector and / or the second current collector, and the other end connected to the housing.

[0024] The present application provides a battery pack in which a first liquid cooling plate and a second liquid cooling plate are arranged alternately. The first liquid cooling plate is disposed between two layers of battery cells, and the second liquid cooling plate is disposed between two rows of battery cells. This allows the coolant in the first and second liquid cooling plates to cool the two adjacent sides of the battery cells simultaneously, thereby improving heat dissipation efficiency, ensuring the safety of the battery cells, and extending the service life of the battery cells.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in the embodiments of this application;

[0028] Figure 2 This is an exploded view of the battery pack structure provided in an embodiment of this application;

[0029] Figure 3 This is an exploded view of the structure of the liquid cooling component in the battery pack provided in an embodiment of this application;

[0030] Figure 4 for Figure 3 Enlarged view of point D in the middle;

[0031] Figure 5 for Figure 3 Enlarged view at point E in the middle;

[0032] Figure 6 for Figure 2 Enlarged view of point C in the middle;

[0033] Figure 7 for Figure 1 Enlarged view of point A in the middle;

[0034] Figure 8 for Figure 1 Enlarged view of point B in the middle;

[0035] Figure 9 This is a schematic diagram of the flow of coolant in a battery pack provided in an embodiment of this application.

[0036] Figure label:

[0037] 100. Battery pack;

[0038] 10. Box body; 11. Receiving cavity; 12. Crossbeam;

[0039] 20. Battery module; 21. Battery cell;

[0040] 30. Liquid cooling components;

[0041] 31. First liquid cooling plate; 311. First liquid cooling channel; 312. First connecting rib; 313. Through hole; 314. First reinforcing part;

[0042] 32. Second liquid cooling plate; 321. Second liquid cooling channel; 322. Second connecting rib; 323. Second reinforcing part;

[0043] 33. First manifold; 331. First liquid inlet; 332. Limiting boss;

[0044] 34. Second manifold; 341. Second liquid inlet;

[0045] 35. Third manifold; 351. First liquid outlet;

[0046] 36. Fourth manifold; 361. Second liquid outlet;

[0047] 37. Inlet pipe; 38. Outlet pipe;

[0048] 41. First fixing plate; 42. Second fixing plate. Detailed Implementation

[0049] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0050] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this utility model.

[0051] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0054] Please refer to Figure 1 and Figure 2 This application provides a battery pack 100, which includes a housing 10, at least one battery module 20, and a liquid cooling assembly 30.

[0055] The housing 10 has a receiving cavity 11 for accommodating the battery module 20 and the liquid cooling assembly 30. The housing 10 may be made of a metallic material, such as aluminum alloy or steel, to provide sufficient strength and protection. The shape of the receiving cavity 11 is adapted to the shape of the battery module 20 to facilitate the installation and fixation of the battery module 20.

[0056] The battery module 20 is located within the accommodating cavity 11. The battery module 20 includes multiple battery cells 21, which are arranged along the X direction (i.e., Figure 2 The coordinate system shown in the figure has the X-axis direction and the Z-axis direction (that is, the coordinate system shown in the figure). Figure 2 The cells 21 are stacked and arranged in a double-layer, double-row structure (in the coordinate system shown in the figure, along the Z-axis). In this embodiment, the X-direction is the width direction of the battery module 20, and the Z-direction is the height direction of the battery module 20. The battery cells 21 are preferably square cells 21 to facilitate stacking and forming a compact double-layer, double-row structure, but the shape of the battery cells 21 is not limited to this.

[0057] The number of battery cells 21 can be 4, 8, 16 or more, usually a multiple of 4, and can be set according to requirements. This application embodiment does not impose a specific limitation. Preferably, the battery cells 21 can be high-energy-density battery types such as lithium-ion batteries and lithium polymer batteries.

[0058] The liquid cooling assembly 30 includes a first liquid cooling plate 31 and a second liquid cooling plate 32 that are interleaved. The first liquid cooling plate 31 extends along the X direction and is disposed between the double-layer cells 21, and the second liquid cooling plate 32 extends along the Z direction and is disposed between the double-row cells 21, so that the coolant flowing in the first liquid cooling plate 31 and the second liquid cooling plate 32 cools the two adjacent sides of the cells 21. Figure 2 The diagram shows that the large surface and the side surface of the battery cell 21 are respectively attached to the first liquid cooling plate 31 and the second liquid cooling plate 32. This staggered liquid cooling plate structure can effectively cool both surfaces of the battery cell 21 at the same time, improving heat dissipation efficiency.

[0059] The liquid cooling plates (first liquid cooling plate 31 and second liquid cooling plate 32) can be made of materials with good thermal conductivity, such as aluminum alloy and copper alloy, to improve heat dissipation efficiency. The coolant can be water, ethylene glycol aqueous solution, or special coolant, and the appropriate coolant should be selected according to the operating environment and temperature requirements.

[0060] Figure 2 The diagram shows that the battery module 20 has a double-layer, double-row configuration in both the X and Z directions, while the battery module 20 also has a double-row configuration in the Y direction (i.e., ...). Figure 2The Y-axis direction in the coordinate system shown in the figure is also two columns. However, the liquid cooling component 30 can have more than two columns in the Y direction as required. The length of the first liquid cooling plate 31 and the second liquid cooling plate 32 extending in the Y direction can be adapted to the number of cells 21. This application embodiment does not make specific limitations.

[0061] In one alternative embodiment, please refer to Figures 2 to 4 The second liquid cooling plate 32 is inserted into the first liquid cooling plate 31, and the first liquid cooling plate 31 is perpendicular to the second liquid cooling plate 32. The first liquid cooling plate 31 has a through hole 313 for the second liquid cooling plate 32 to pass through, and the through hole 313 extends along the Y direction. In this embodiment, the Y direction is the length direction of the battery module 20, and is perpendicular to the X and Z directions. Through this insertion structure, the first liquid cooling plate 31 and the second liquid cooling plate 32 form a three-dimensional staggered cooling system, which can more comprehensively cover multiple surfaces of the battery cell 21 and improve the cooling effect.

[0062] Both the first liquid cooling plate 31 and the second liquid cooling plate 32 are harmonica tube structures. The harmonica tube can be extruded in one piece, which not only ensures the structural strength of the liquid cooling plate, but also reduces the number of parts and reduces the complexity of assembly.

[0063] In an optional embodiment, the liquid cooling assembly 30 may further include a flow control valve for regulating the flow rate of coolant entering the first liquid cooling plate 31 and the second liquid cooling plate 32. By controlling the flow rate, different areas can be cooled differently according to the actual temperature distribution of the battery cell 21, thereby improving cooling efficiency and uniformity.

[0064] In an optional embodiment, both the first liquid cooling plate 31 and the second liquid cooling plate 32 are bonded to the battery cell 21 by thermally conductive adhesive or double-sided adhesive, so that the battery module is integrated.

[0065] In an optional embodiment, the liquid cooling assembly 30 further includes a first manifold 33, a second manifold 34, a third manifold 35, and a fourth manifold 36. The first manifold 33 and the second manifold 34 are perpendicularly connected to each other, and the third manifold 35 and the fourth manifold 36 are perpendicularly connected to each other. These manifolds are used to connect the liquid cooling plate and form a flow channel for the coolant.

[0066] The second manifold 34 and the fourth manifold 36 are respectively connected to both ends of the first liquid cooling plate 31 along the Y direction, and both are connected to the multiple first liquid cooling channels 311 provided on the first liquid cooling plate 31. The first manifold 33 and the third manifold 35 are respectively connected to both ends of the second liquid cooling plate 32 along the Y direction, and both are connected to the multiple second liquid cooling channels 321 provided on the second liquid cooling plate 32. Through this connection method, the coolant can form a complete circulation path within the liquid cooling plate.

[0067] In an optional embodiment, the plurality of first liquid cooling channels 311 provided on the first liquid cooling plate 31 and the plurality of second liquid cooling channels 321 provided on the second liquid cooling plate 32 both extend along the Y direction, and the first liquid cooling channels 311 and the second liquid cooling channels 321 are not connected. This design allows the two cooling systems to be connected in parallel, operate independently without interfering with each other, and improve the reliability and flexibility of the system.

[0068] In an optional embodiment, the first manifold 33 has a first liquid inlet 331, and the third manifold 35 has a first liquid outlet 351. Coolant flows into multiple second liquid cooling channels 321 through the first liquid inlet 331 and exits through the first liquid outlet 351. The second manifold 34 has a second liquid inlet 341, and the fourth manifold 36 has a second liquid outlet 361. Coolant flows into multiple first liquid cooling channels 311 through the second liquid inlet 341 and exits through the second liquid outlet 361. This inlet and outlet design allows the coolant to form a complete circulation path, ensuring a cooling effect.

[0069] In an optional embodiment, the liquid cooling assembly 30 further includes an inlet pipe 37 and an outlet pipe 38. One end of the inlet pipe 37 and the outlet pipe 38 is used to connect to a liquid supply device (not shown in the figure) outside the battery pack 100. The other end of the inlet pipe 37 is connected to a first liquid inlet 331 and a second liquid inlet 341, and the other end of the outlet pipe 38 is connected to a first liquid outlet 351 and a second liquid outlet 361.

[0070] In an optional embodiment, the first liquid inlet 331 and the first liquid outlet 351 are respectively located diagonally opposite to the second liquid cooling plate 32, and the first liquid inlet 331 is along the Z direction (i.e., Figure 3 The Z-axis direction in the coordinate system shown is higher than the first outlet 351. This design utilizes gravity to allow the coolant to flow more smoothly. The second inlet 341 and the second outlet 361 are respectively diagonally opposite to the first liquid cooling plate 31. This diagonal arrangement of the inlet and outlet ensures that the coolant flows evenly through all channels, improving the uniformity of heat exchange and thus improving cooling efficiency.

[0071] In one alternative embodiment, please refer to Figure 2 , Figure 3 and Figure 4A first reinforcing portion 314 is provided at the position corresponding to the through hole 313 on the first liquid cooling plate 31, and the first reinforcing portion 314 surrounds the periphery of the through hole 313. A second liquid cooling plate 32 passes through the through hole 313 along the Z direction, and a second reinforcing portion 323 is provided at the position corresponding to the through hole 313, and the second reinforcing portion 323 extends along the Y direction. The first liquid cooling plate 31 and the second liquid cooling plate 32 form a cross-shaped harmonica tube. Since the middle area of ​​the cross-shaped harmonica tube does not contact the battery cell 21, there is no need to provide a flow channel in the middle area of ​​the cross-shaped harmonica tube. Instead, a reinforcing portion is provided in the middle area of ​​the cross-shaped harmonica tube. These reinforcing portions can enhance the structural strength of the liquid cooling plate at the cross connection, reduce the waste of liquid cooling flow, improve energy utilization, and prevent damage caused by vibration or impact during use.

[0072] In an optional embodiment, adjacent second liquid cooling channels 321 are separated by a second connecting rib 322, which has a rectangular structure. Adjacent first liquid cooling channels 311 are separated by a first connecting rib 312, which has a C-shaped cross-section. The first connecting rib 312 and the second connecting rib 322 not only serve to separate the channels, but the C-shaped first connecting rib 312 also has a buffering and energy-absorbing function, which can absorb the expansion force of the battery cell 21 in the large-area direction and extend the service life of the battery cell 21. The rectangular second connecting rib 322 can also enhance the overall strength of the liquid cooling plate and provide a larger heat exchange area.

[0073] In one alternative embodiment, please refer to Figure 2 , Figure 3 and Figure 5 Each of the first manifold 33, the second manifold 34, the third manifold 35, and the fourth manifold 36 is provided with a limiting boss 332. The limiting boss 332 is used to limit the position of the first liquid cooling plate 31 and the second liquid cooling plate 32 when they are respectively inserted into the second manifold 34 and the first manifold 33. The limiting boss 332 can abut against the first liquid cooling plate 31 and the second liquid cooling plate 32, ensuring that the first liquid cooling plate 31 and the second liquid cooling plate 32 are installed in the correct position, avoiding excessive insertion of the first liquid cooling plate 31 and the second liquid cooling plate 32, which would affect the fluid flow effect and thus lead to a decrease in the cooling effect.

[0074] In one alternative embodiment, please refer to Figure 2 , Figure 6 , Figure 7 and Figure 8 The battery pack 100 also includes a first fixing plate 41, one end of which is connected to the first current collector 33 and / or the second current collector 34, and the other end is connected to the housing 10. The first fixing plate 41 can firmly fix the liquid cooling assembly 30 to the crossbeam 12 of the housing 10 to prevent loosening or displacement caused by vibration during use.

[0075] In an optional embodiment, the battery pack 100 may further include a second fixing plate 42, which is connected between the third current collector 35 and / or the fourth current collector 36 and the housing 10, forming a more stable support structure. This bidirectional fixing method can effectively prevent the liquid cooling assembly 30 from being displaced or damaged due to vibration or impact during use.

[0076] Please refer to Figure 2 and Figure 9 When the battery module 20 is operating, the battery cell 21 generates heat. Coolant enters through the first inlet 331 into multiple second liquid cooling channels 321 of the second liquid cooling plate 32, absorbs the heat generated by the battery cell 21, and is then discharged from the first outlet 351. Simultaneously, another portion of coolant enters through the second inlet 341 into multiple first liquid cooling channels 311 of the first liquid cooling plate 31, absorbs the heat generated by the battery cell 21, and is then discharged from the second outlet 361. This dual cooling system effectively controls the temperature of the battery cell 21, preventing performance degradation or safety issues caused by overheating.

[0077] Since the first liquid cooling plate 31 and the second liquid cooling plate 32 extend along the X and Z directions respectively and are staggered, multiple sides of the battery cell 21 can be cooled, forming a three-dimensional cooling network. This cooling method is more efficient than traditional single-sided cooling, can more uniformly control the temperature of the battery cell 21, extend battery life, and improve the overall performance and safety of the battery pack 100.

[0078] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery pack, characterized by, The battery pack (100) includes: The housing (10) has a receiving cavity (11); At least one battery module (20) is located in the accommodating cavity (11). The battery module includes multiple battery cells, which are stacked along the X and Z directions to form a double-layer double-row structure. The liquid cooling assembly (30) includes a first liquid cooling plate (31) and a second liquid cooling plate (32) that are interleaved. The first liquid cooling plate (31) extends along the X direction and is disposed between the two layers of the battery cells (21). The second liquid cooling plate (32) extends along the Z direction and is disposed between the two rows of battery cells (21), so that the coolant flowing in the first liquid cooling plate (31) and the second liquid cooling plate (32) cools the two adjacent sides of the battery cells (21). The X direction is the width direction of the battery module and the Z direction is the height direction of the battery module.

2. The battery pack of claim 1, wherein, The second liquid cooling plate (32) is inserted into the first liquid cooling plate (31), and the first liquid cooling plate (31) is perpendicular to the second liquid cooling plate (32). The first liquid cooling plate (31) has a through hole (313) through which the second liquid cooling plate (32) passes, and the through hole (313) extends along the Y direction.

3. The battery pack of claim 1, wherein, The liquid cooling assembly (30) further includes a first collector (33), a second collector (34), a third collector (35) and a fourth collector (36), wherein the first collector (33) and the second collector (34) are perpendicularly connected to each other, and the third collector (35) and the fourth collector (36) are perpendicularly connected to each other. The second current collector (34) and the fourth current collector (36) are respectively connected to the two ends of the first liquid cooling plate (31) along the Y direction, and are both connected to the multiple first liquid cooling channels (311) provided on the first liquid cooling plate (31). The first current collector (33) and the third current collector (35) are respectively connected to the two ends of the second liquid cooling plate (32) along the Y direction, and are both connected to the multiple second liquid cooling channels (321) provided on the second liquid cooling plate (32).

4. The battery pack of claim 1, wherein, The plurality of first liquid cooling channels (311) provided on the first liquid cooling plate (31) and the plurality of second liquid cooling channels (321) provided on the second liquid cooling plate (32) both extend along the Y direction, and the first liquid cooling channels (311) and the second liquid cooling channels (321) are not connected.

5. The battery pack of claim 3, wherein, The first collector (33) is provided with a first liquid inlet (331), and the third collector (35) is provided with a first liquid outlet (351). Coolant flows into multiple second liquid cooling channels (321) through the first liquid inlet (331) and is discharged from the first liquid outlet (351). The second manifold (34) has a second liquid inlet (341) protruding, and the fourth manifold (36) has a second liquid outlet (361) protruding. Coolant flows into multiple first liquid cooling channels (311) through the second liquid inlet (341) and is discharged from the second liquid outlet (361).

6. The battery pack of claim 5, wherein, The first liquid inlet (331) and the first liquid outlet (351) are respectively diagonally opposite to the second liquid cooling plate (32), and the first liquid inlet (331) is higher than the first liquid outlet (351) along the Z direction. The second liquid inlet (341) and the second liquid outlet (361) are respectively located diagonally opposite to the first liquid cooling plate (31).

7. The battery pack of claim 2, wherein, The first liquid cooling plate (31) is provided with a first reinforcing part (314) at the position corresponding to the through hole (313), and the first reinforcing part (314) surrounds the periphery of the through hole (313); the second liquid cooling plate (32) passes through the through hole (313) along the Z direction, and is provided with a second reinforcing part (323) at the position corresponding to the through hole (313), and the second reinforcing part (323) extends along the Y direction.

8. The battery pack of claim 3, wherein, The adjacent second liquid cooling channels (321) are separated by a second connecting rib (322), which is a rectangular structure; the adjacent first liquid cooling channels (311) are separated by a first connecting rib (312), which has a C-shaped cross section.

9. The battery pack of claim 3, wherein, The first current collector (33), the second current collector (34), the third current collector (35) and the fourth current collector (36) are all provided with limiting bosses (332), which are used to limit the positions of the first liquid cooling plate (31) and the second liquid cooling plate (32) respectively inserted into the second current collector (34) and the first current collector (33).

10. The battery pack of claim 3, wherein, The battery pack (100) also includes: The first fixing plate (41) is connected at one end to the first current collector (33) and / or the second current collector (34), and at the other end to the housing (10).

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