Battery pack and electric device

Abstract

The embodiment of the application provides a battery pack and an electric equipment, and relates to the technical field of batteries. The battery pack comprises a shell, a cover, at least two battery modules and at least two cold plates, the shell has an accommodating cavity with an open end; the at least two battery modules are located in the accommodating cavity; the at least two cold plates are located in the accommodating cavity; the at least two cold plates and the at least two battery modules are alternately and stacked in the direction from the shell to the cover; the cold plate has a cooling channel, and the cooling channel is communicated with a connecting port and a liquid storage tank; in the embodiment of the application, the opening size of the connecting port of the cold plate close to the cover is greater than the opening size of the connecting port of the cold plate away from the cover, so that the cold plate close to the cover can obtain greater flow of the cooling liquid, thereby compensating for insufficient flow caused by gravity and pressure loss, enhancing the cooling effect of the cold plate close to the cover, reducing the temperature difference between different battery modules, reducing temperature unevenness, and improving the cooling effect of the cold plate.

Description

Technical Field

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

[0002] The rapid development of new energy sources has led to a continuous increase in the demand for battery packs.

[0003] In related technologies, designing a double-layer battery module within an electric vehicle can increase the vehicle's total battery capacity. Currently, to ensure the normal operation of the battery, a cooling plate is often placed at the bottom of each battery module layer to cool it down.

[0004] However, the existing battery pack's cold plate has a problem with poor cooling performance. Utility Model Content

[0005] This application provides a battery pack and electrical equipment that reduces the temperature unevenness of different cold plates and improves the cooling efficiency of the cold plates.

[0006] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0007] A housing having a receiving cavity open at one end;

[0008] The lid, which closes to the opening;

[0009] At least two battery modules are located in the receiving cavity; at least two battery modules are stacked along the direction from the housing to the cover.

[0010] At least two cold plates are located in the receiving cavity; at least two cold plates are stacked along the direction from the shell to the cover; at least two cold plates and at least two battery modules are stacked alternately.

[0011] The cold plate has a cooling channel, which is connected to the liquid storage tank through a connection port; along the direction from the shell to the cover, the opening size of the connection port of the cold plate closer to the cover is larger than the opening size of the connection port of the cold plate farther away from the cover.

[0012] In some embodiments of this application, the connection port includes a liquid inlet and a liquid outlet; along a first direction intersecting the housing to the cover, the liquid inlet and the liquid outlet are respectively disposed at both ends of the cold plate.

[0013] The two ends of the cooling channel are connected to the liquid inlet and the liquid outlet, respectively.

[0014] At least two cold plates include a first cold plate and a second cold plate; the first cold plate and the second cold plate are spaced apart along the direction from the shell to the cover.

[0015] The opening size of the liquid inlet of the second cold plate is larger than the opening size of the liquid inlet of the first cold plate; and / or, the opening size of the liquid outlet of the second cold plate is larger than the opening size of the liquid outlet of the first cold plate.

[0016] In some embodiments of this application, the battery pack further includes a connector for connecting the cooling channel and the liquid reservoir via a connection port.

[0017] The connector includes a first connecting part; a first connector and a second connector are sequentially provided on the first connecting part, and the first connecting part is connected to the liquid inlet of the first cold plate through the first connector; the first connecting part is connected to the liquid inlet of the second cold plate through the second connector.

[0018] And / or, the connector further includes a second connecting part, on which a third connector and a fourth connector are sequentially provided. The second connecting part is connected to the liquid outlet of the first cold plate through the third connector; the second connecting part is connected to the liquid outlet of the second cold plate through the fourth connector.

[0019] In some embodiments of this application, the opening size of the liquid inlet of the second cold plate is A, and the opening size of the liquid inlet of the first cold plate is B, wherein A and B satisfy: A > 1.1B.

[0020] And / or, the opening size of the liquid outlet of the second cold plate is C, and the opening size of the liquid outlet of the first cold plate is D, where C and D satisfy: C > 1.1D.

[0021] In some embodiments of this application, along the direction from the housing to the cover, the volume of the cooling channel of the cold plate near the cover is greater than the volume of the cooling channel of the cold plate away from the cover.

[0022] In some embodiments of this application, the battery pack further includes a first sealing member and a second sealing member; the cold plate has a cooling cavity; the first sealing member is located in the cooling cavity of the first cold plate, and the second sealing member is located in the cooling cavity of the second cold plate.

[0023] The first sealing component includes a first sealing part and a second sealing part. Along a second direction intersecting the housing to the cover, the first sealing part is disposed in the cooling channel of the first cold plate, near the liquid inlet at one end; the second sealing part is disposed in the cooling channel of the first cold plate, away from the liquid inlet at one end.

[0024] The second sealing component includes a third sealing part and a fourth sealing part. Along a second direction intersecting the housing to the cover, the third sealing part is disposed in the cooling channel of the second cold plate, near the liquid inlet at one end; the fourth sealing part is disposed in the cooling channel of the second cold plate, away from the liquid inlet at one end.

[0025] The first and second directions intersect.

[0026] In some embodiments of this application, the extension length of the fourth sealing portion along the second direction is less than the extension length of the second sealing portion along the second direction.

[0027] In some embodiments of this application, the cooling channel includes a first channel segment, a second channel segment, and a third channel segment.

[0028] The first, second, and third passage sections all extend along the second direction.

[0029] The two ends of the first channel section are used to connect with the liquid inlet and the second channel section, respectively.

[0030] The two ends of the third channel section are used to connect with the liquid outlet and the second channel section, respectively.

[0031] In some embodiments of this application, the battery pack further includes a separator that extends along a second direction.

[0032] The separator divides the cooling cavity into an empty channel and a cooling channel; along the first direction, the empty channel is located on the side of the first channel segment opposite to the second channel segment.

[0033] Secondly, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0034] The battery pack and electrical device provided in this application include a housing, a cover, at least two battery modules, and at least two cold plates. The housing has a receiving cavity with one open end; at least two battery modules are located in the receiving cavity; at least two battery modules are stacked along the direction from the housing to the cover; at least two cold plates are located in the receiving cavity; at least two cold plates are stacked along the direction from the housing to the cover; at least two cold plates and at least two battery modules are stacked alternately. The cold plates have cooling channels that are connected to a liquid storage tank through connection ports; the opening size of the connection port of the cold plate closer to the cover is larger than the opening size of the connection port of the cold plate farther from the cover.

[0035] In this embodiment, the opening size of the connection port of the cold plate near the cover is larger than that of the connection port of the cold plate farther from the cover. This design allows the cold plate near the cover to receive a larger coolant flow, thereby compensating for insufficient flow due to gravity and pressure loss, thus enhancing the cooling effect of the cold plate near the cover and reducing the temperature difference between different battery modules. Simultaneously, by adjusting the opening size of the connection port, the coolant is ensured to be more evenly distributed in each layer of cold plates, reducing temperature unevenness and improving the cooling effect of the cold plates. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the structure of the cold plate of the battery pack provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of the second cold plate of the battery pack provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of the first cold plate of the battery pack provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100: Battery module;

[0043] 201: Cooling channel; 202: Liquid inlet; 203: Liquid outlet; 204: First channel section; 205: Second channel section; 206: Third channel section; 207a: First sealing part; 207b: Second sealing part; 207c: Third sealing part; 207d: Fourth sealing part;

[0044] 210: First cold-rolled plate; 220: Second cold-rolled plate;

[0045] 310: First connecting part; 320: Second connecting part;

[0046] 400: Separator; 410: Empty passage.

[0047] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0049] In related technologies, the chassis space in electric vehicles is the primary area for housing the battery pack. To meet power demands within a limited space, a dual-layer battery module design has become an effective solution. This design fully utilizes vertical space, allowing more battery cells to be accommodated within the limited chassis space, thereby increasing the total battery capacity.

[0050] The dual-layer battery module design increases battery density, thus generating more heat. This places higher demands on the vehicle's thermal management system, requiring the design of an efficient cooling system to ensure that each battery cell operates within its optimal temperature range.

[0051] Currently, in order to ensure the normal operation of the battery, a cold plate is often installed at the bottom of each battery module to cool down the battery module in that layer.

[0052] However, due to the influence of gravity, pressure loss, and spatial structure, the coolant flow rate and velocity within the upper cold plate are relatively low. This makes it difficult to control the temperature of the upper battery module, affecting the overall temperature uniformity of the battery pack.

[0053] In cold plates, gravity affects the flow of coolant. Generally, coolant flows more easily in the lower cold plates because gravity facilitates downward flow. In the upper cold plates, however, the coolant must overcome gravity to achieve the required flow rate and volume, which may result in poorer cooling performance.

[0054] Pressure loss refers to the pressure loss caused by factors such as friction and turbulence when a fluid flows in a pipe or channel. In a battery pack with multiple cold plates, the upper cold plate is often farther from the pump or needs to pass through more bends and narrow channels, which increases pressure loss and leads to a reduction in coolant flow.

[0055] Uneven cooling can cause the upper battery module to overheat. This temperature unevenness can lead to decreased battery performance, shortened lifespan, and even safety issues such as thermal runaway.

[0056] In summary, the existing battery pack cooling plates have the problem of poor cooling performance.

[0057] In view of this, embodiments of this application provide a battery pack and an electrical device. The battery pack includes a housing, a cover, at least two battery modules, and at least two cold plates. The housing has a receiving cavity with one end open. At least two battery modules are located in the receiving cavity. Along the direction from the housing to the cover, at least two battery modules are stacked. At least two cold plates are located in the receiving cavity. Along the direction from the housing to the cover, at least two cold plates are stacked. The at least two cold plates and at least two battery modules are stacked alternately. The cold plates have cooling channels that are connected to a liquid storage tank through connection ports. The opening size of the connection port of the cold plate closer to the cover is larger than the opening size of the connection port of the cold plate farther from the cover.

[0058] In this embodiment, the opening size of the connection port of the cold plate near the cover is larger than that of the connection port of the cold plate farther from the cover. This design allows the cold plate near the cover to receive a larger coolant flow, thereby compensating for insufficient flow due to gravity and pressure loss, thus enhancing the cooling effect of the cold plate near the cover and reducing the temperature difference between different battery modules. Simultaneously, by adjusting the opening size of the connection port, the coolant is ensured to be more evenly distributed in each layer of cold plates, reducing temperature unevenness and improving the cooling effect of the cold plates.

[0059] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0060] Firstly, referring to Figures 1 to 4 As shown, this application embodiment provides a battery pack, including:

[0061] A housing having a receiving cavity open at one end;

[0062] The lid, which closes to the opening;

[0063] At least two battery modules 100 are located in the receiving cavity; at least two battery modules 100 are stacked along the direction from the housing to the cover.

[0064] At least two cold plates are located in the receiving cavity; at least two cold plates are stacked along the direction from the shell to the cover; at least two cold plates and at least two battery modules 100 are stacked alternately.

[0065] The cold plate has a cooling channel 201, which is connected to the liquid storage tank through a connection port; the opening size of the connection port of the cold plate closer to the cover is larger than the opening size of the connection port of the cold plate farther away from the cover.

[0066] For example, the housing and cover are used to provide an enclosed space, i.e., a receiving cavity, to accommodate the battery module 100 and the cold plate, protecting the battery module 100 and the cold plate from the influence of the external environment.

[0067] The battery module 100 provides power output and is the core functional component of the battery pack. It is arranged sequentially from the casing to the cover, forming a multi-layered structure. The direction from the casing to the cover is referenced... Figure 1 The direction indicated by Z in the middle.

[0068] The cold plate is used to cool the battery module 100, ensuring that the battery operates within an optimal temperature range. At least two battery modules are included, comprising a first battery module and a second battery module. At least two cold plates are included, comprising a first cold plate 210 and a second cold plate 220. Referring to the direction from the housing to the cover... Figure 1 In the direction shown in the middle Z, the first battery module and the second battery module are stacked. The first cold plate 210 and the second cold plate 220 are also stacked. The first battery module is positioned above the first cold plate 210, and the second battery module is positioned above the second cold plate 220. In this way, at least two cold plates and at least two battery modules 100 are stacked alternately to ensure that each battery module 100 has a dedicated cooling mechanism.

[0069] The cooling channel 201 inside the cold plate is used for the flow of coolant to remove the heat generated by the battery module 100.

[0070] The connection port is the interface between the cooling channel 201 and the liquid storage tank, used for the inlet and outlet of coolant.

[0071] The coolant tank is used to store coolant to ensure the continuous operation of the cold plate.

[0072] In this embodiment, the opening size of the connection port of the cold plate near the cover is larger than that of the connection port of the cold plate away from the cover. This design allows the cold plate near the cover to obtain a larger coolant flow rate, thereby compensating for insufficient coolant flow rate caused by gravity and pressure loss, thereby enhancing the cooling efficiency of the cold plate near the cover and reducing the temperature difference between different battery modules 100.

[0073] Meanwhile, by adjusting the opening size of the connection port, the coolant is distributed more evenly in each layer of cold plates, reducing temperature unevenness and improving the cooling effect of the cold plates.

[0074] The first cold plate 210 and the second cold plate 220 can be profiled liquid-cooled plates. Profiled liquid-cooled plates are typically manufactured through an extrusion process, which allows for the creation of cold plates with complex internal cooling channel structures to optimize the flow path of the coolant.

[0075] In one feasible implementation, the connection port includes an inlet 202 and an outlet 203; along a first direction intersecting the housing to the cover, the inlet 202 and the outlet 203 are respectively disposed at both ends of the cold plate. The first direction refers to... Figure 1 The direction indicated by X in the middle.

[0076] The two ends of the cooling channel 201 are connected to the liquid inlet 202 and the liquid outlet 203, respectively.

[0077] The cold plate includes a first cold plate 210 and a second cold plate 220; the first cold plate 210 and the second cold plate 220 are spaced apart along the direction from the shell to the cover.

[0078] The opening size of the liquid inlet 202 of the second cold plate 220 is larger than the opening size of the liquid inlet 202 of the first cold plate 210; the opening size of the liquid outlet 203 of the second cold plate 220 is larger than the opening size of the liquid outlet 203 of the first cold plate 210.

[0079] For example, the cold plate is provided with an inlet 202 and an outlet 203 at both ends, so that the coolant can flow in the cooling channel 201 and carry away the heat generated by the battery module 100.

[0080] Cooling channel 201 connects inlet 202 and outlet 203 to ensure the flow path of coolant.

[0081] Along the direction from the shell to the cover, the first cold plate 210 and the second cold plate 220 are arranged at intervals, respectively corresponding to different battery modules 100.

[0082] Because the second cold plate 220 has a larger opening size near the liquid inlet 202 and liquid outlet 203 of the cover, it can achieve a higher coolant flow rate and velocity. This compensates for the insufficient coolant flow rate caused by gravity and pressure loss. By increasing the coolant flow rate, the second cold plate 220 can more effectively remove heat, ensuring temperature control of the battery module 100 near the cover, i.e., the upper battery module 100.

[0083] At the same time, by optimizing the distribution of coolant, the effect of reducing the risk of cross-flow is reduced. Figure 1 The temperature difference between the different battery modules 100 shown in the Z-direction ensures a more uniform temperature across the entire battery pack. Temperature uniformity helps improve battery performance and lifespan, and reduces safety risks.

[0084] As one possible implementation, the battery pack also includes a connector for connecting the cooling channel 201 and the liquid reservoir via a connection port.

[0085] The connector includes a first connecting part 310; a first connector and a second connector are sequentially provided on the first connecting part 310; the first connecting part 310 is connected to the liquid inlet 202 of the first cold plate 210 through the first connector; the first connecting part 310 is connected to the liquid inlet 202 of the second cold plate 220 through the second connector.

[0086] For example, the connector is used to connect the cooling channel 201 and the reservoir through the connector port to ensure that the coolant can circulate in the system.

[0087] The first connecting part 310 is a quick-connect tee pipe. This design allows the connector to be quickly and easily connected to different cold plate inlets 202.

[0088] The first connector and the second connector are used to connect the liquid inlets 202 of the first cold plate 210 and the second cold plate 220, respectively, to ensure that the coolant can flow to the first cold plate 210 and the second cold plate 220 at the same time.

[0089] The use of quick-connect tee fittings simplifies the installation process, allowing for rapid connection and disconnection of the connectors. This not only improves production efficiency but also facilitates later maintenance and replacement. The tee fittings allow coolant to be distributed to multiple cooling plates simultaneously. This design ensures efficient coolant distribution, especially when multiple battery modules need to be cooled simultaneously.

[0090] As one feasible implementation, the connector further includes a second connecting part 320, on which a third connector and a fourth connector are sequentially provided. The second connecting part 320 is connected to the liquid outlet 203 of the first cold plate 210 through the third connector; the second connecting part 320 is connected to the liquid outlet 203 of the second cold plate 220 through the fourth connector.

[0091] For example, the second connection part 320, as part of the connector, is responsible for connecting the outlets 203 of the multiple cold plates, ensuring that the coolant can be effectively discharged from the cold plates and returned to the storage tank.

[0092] The third and fourth connectors are used to connect the liquid outlets 203 of the first cold plate 210 and the second cold plate 220, respectively, to ensure that coolant can be discharged from multiple cold plates at the same time.

[0093] The second connecting part 320 is a quick-connect tee pipe. This design allows the connector to be quickly and easily connected to different cold plate outlets 203, simplifying the installation and maintenance of the system.

[0094] The use of quick-connect tee pipes simplifies the connection process of outlet 203, making the connection between the cold plate and the reservoir faster. This not only improves production efficiency but also facilitates later maintenance and replacement. Through the tee pipe, coolant can be discharged from multiple cold plates simultaneously. This design ensures efficient coolant discharge, avoids fluid stagnation, and improves the cooling efficiency of the cold plates.

[0095] As one feasible implementation, the opening size of the liquid inlet 202 of the second cold plate 220 is A, and the opening size of the liquid inlet 202 of the first cold plate 210 is B, where A and B satisfy: A > 1.1B.

[0096] For example, by setting the opening size of the liquid inlet 202 of the second cold plate 220 to be 110% larger than the opening size of the liquid inlet 202 of the first cold plate 210, it is ensured that the second cold plate 220 can obtain more coolant flow to compensate for insufficient flow due to gravity and pressure loss. The larger liquid inlet 202 area allows more coolant to enter, thereby improving the cooling efficiency of the second cold plate 220 and ensuring the temperature control of the upper battery module 100.

[0097] By increasing the coolant flow rate of the second cold plate 220, the temperature difference between the upper and lower battery modules 100 is reduced, ensuring a more uniform temperature across the entire battery pack. This temperature uniformity helps improve battery performance and lifespan, and reduces safety risks.

[0098] Conversely, setting the opening size of the liquid inlet 202 of the second cold plate 220 to be less than 110% of the opening size of the liquid inlet 202 of the first cold plate 210 may result in insufficient coolant flow to the upper cold plate. This reduces the cooling capacity of the second cold plate 220, making it unable to effectively remove the heat generated by the battery module 100. Due to insufficient flow, the cooling effect of the upper cold plate may be less than expected, leading to heat accumulation. The temperature difference between the upper and lower battery modules 100 may increase because the upper cold plate cannot effectively cool them. This temperature difference may cause inconsistent battery performance, affecting overall efficiency.

[0099] Therefore, in the embodiments of this application, A and B satisfy: A > 1.1B.

[0100] As one feasible implementation, the opening size of the liquid outlet 203 of the second cold plate 220 is C, and the opening size of the liquid outlet 203 of the first cold plate 210 is D, where C and D satisfy: C > 1.1D.

[0101] For example, by increasing the opening size of the outlet 203 of the second cold plate 220, resistance to fluid flow can be reduced, thereby improving the flow efficiency of the coolant. This helps ensure that the coolant can be discharged smoothly, preventing excessive pressure from forming within the cold plate. The larger outlet 203 area of ​​the second cold plate 220 allows for a greater flow rate, which helps maintain an appropriate flow rate of coolant within the cold plate, thereby improving heat exchange efficiency.

[0102] As one feasible implementation, along the direction from the shell to the cover, the volume of the cooling channel 201 near the cold plate of the cover is greater than the volume of the cooling channel away from the cold plate of the cover.

[0103] For example, the cold plate near the cover has a larger cooling channel 201 volume. This means that the cold plate can hold more coolant, providing a larger heat exchange area. The larger cooling channel 201 volume means that more coolant can be held, thereby increasing the system's heat capacity. This helps to absorb and remove heat more effectively. At the same time, the larger volume provides a larger heat exchange surface area, enhancing the cooling capacity of the cold plate.

[0104] The cooling channel 201 of the cold plate, which is far from the cover, has a smaller volume.

[0105] By increasing the cooling capacity of the upper cold plate near the cover, the temperature difference between the upper and lower battery modules 100 can be effectively balanced, ensuring a more uniform temperature across the entire battery pack. A larger cooling channel 201 volume helps prevent localized overheating and reduces the risk of thermal runaway.

[0106] As one possible implementation, the battery pack also includes a first sealing member and a second sealing member; the cold plate has a cooling cavity; the first sealing member is located in the cooling cavity of the first cold plate 210, and the second sealing member is located in the cooling cavity of the second cold plate 220.

[0107] The first sealing element includes a first sealing portion 207a and a second sealing portion 207b. Along a second direction intersecting the housing to the cover, the first sealing portion 207a is disposed in the cooling channel 201 of the first cold plate 210, near the end of the liquid inlet 202; the second sealing portion 207b is disposed in the cooling channel 201 of the first cold plate 210, away from the end of the liquid inlet 202. (Second direction reference) Figure 1 The direction shown in Y.

[0108] The second sealing component includes a third sealing part 207c and a fourth sealing part 207d. Along a second direction intersecting the housing to the cover, the third sealing part 207c is disposed in the cooling channel 201 of the second cold plate 220, near the end of the liquid inlet 202; the fourth sealing part 207d is disposed in the cooling channel 201 of the second cold plate 220, away from the end of the liquid inlet 202.

[0109] The first and second directions intersect.

[0110] For example, the cooling cavity is the space inside the cold plate for containing coolant. The cooling channel 201 is the path for the coolant flow.

[0111] Cooling channels 201 are formed within the cold plate. A first sealing member is used to seal the ports of the cooling channels 201 of the first cold plate 210, ensuring that the coolant flows along a preset path. A second sealing member is used to seal the ports of the cooling channels 201 of the second cold plate 220, ensuring that the coolant flows along a preset path. Furthermore, the coolant is pressurized under the drive of a pump, and the first and second sealing members, acting as load-bearing end caps, prevent deformation or cracking of the ends of the first and second cold plates 210 and 220.

[0112] The first sealing part 207a, the second sealing part 207b, the third sealing part 207c, and the fourth sealing part 207d can be plugs.

[0113] As one feasible implementation, the extension length of the fourth sealing part 207d along the second direction is less than the extension length of the second sealing part 207b along the second direction.

[0114] For example, under the condition that the external dimensions of the first cold plate 210 and the second cold plate 220 are fixed, the volume of the cooling channel 201 of the first cold plate 210 and the volume of the cooling channel 201 of the second cold plate 220 are equal. By setting the extension length of the fourth sealing part 207d in the cold plate cavity of the second cold plate 220 to be less than the length of the second sealing part 207b in the cooling cavity of the first cold plate 210, the length of the cooling channel 201 in the second cold plate 220 is less than the length of the cooling channel 201 in the first cold plate 210, and the volume of the cooling channel 201 in the second cold plate 220 is less than the volume of the cooling channel 201 in the first cold plate 210.

[0115] With the same external dimensions and pumping pressure, a shorter cooling channel 201 means that the coolant can pass through the second cold plate 220 more quickly, thus increasing the flow rate. The higher flow rate increases the frequency and efficiency of the coolant's contact with the cold plate surface, thereby enhancing the heat exchange effect.

[0116] In this way, compared with the first cold plate 210, the flow rate of coolant in the second cold plate 220 is increased, the temperature difference between the upper and lower cold plates is reduced, the heat exchange effect of the second cold plate 220 is increased, and the overall temperature difference of the battery pack is reduced.

[0117] As one possible implementation, the cooling channel 201 includes a first channel segment 204, a second channel segment 205, and a third channel segment 206.

[0118] The first channel segment 204, the second channel segment 205, and the third channel segment 206 all extend along the second direction.

[0119] The two ends of the first channel section 204 are used to connect with the liquid inlet 202 and the second channel section 205, respectively.

[0120] The two ends of the third channel section 206 are used to connect with the liquid outlet 203 and the second channel section 205, respectively.

[0121] For example, the second channel segment 205 includes a first sub-channel segment and a second sub-channel segment. Both the first sub-channel segment and the second sub-channel segment extend along a second direction.

[0122] The first end of the first channel section 204 is connected to the liquid inlet 202, and the second end of the first channel section 204 is connected to the liquid inlet end of the first sub-channel section. The function of the first channel section 204 is to guide the coolant from the liquid inlet 202 into the cooling channel 201.

[0123] The inlet end of the second sub-channel section is connected to the outlet end of the first sub-channel section.

[0124] The first end of the third channel section 206 is connected to the outlet end of the second sub-channel section. The second end of the third channel section 206 is connected to the outlet 203. The function of the third channel section 206 is to guide the coolant out of the cooling channel 201.

[0125] By dividing the cooling channel 201 into multiple segments, such as the first channel segment 204, sub-channel segments within the second channel segment 205, and the third channel segment 206, the coolant undergoes heat exchange progressively within each segment. This segmented approach allows for more precise control of the heat exchange process at each stage, improving overall heat exchange efficiency. Each channel segment provides the coolant with an opportunity to contact the surface of the cold plate, increasing the contact time between the liquid and the surface, thereby enhancing the efficiency of heat transfer.

[0126] In related technologies, cold plates often adopt a single-inlet, single-outlet design on the side. As the coolant flows through the cooling channel 201, the heat exchange effect gradually weakens. This is because the coolant gradually absorbs heat as it flows through the cooling channel 201, causing its temperature to rise and resulting in a decrease in its heat exchange capacity. As a result, there is a large temperature difference between the battery inlet and outlet of the single-layer module, which affects the battery's performance and efficiency. To further improve the heat exchange uniformity of the cold plate, in this embodiment, the battery pack also includes a separator 400, which extends along a second direction.

[0127] The separator 400 divides the cooling cavity into an empty channel 410 and a cooling channel 201; along the first direction, the empty channel 410 is located on the side of the first channel segment 204 away from the second channel segment 205.

[0128] For example, the separator 400 divides the cooling chamber into an empty channel 410 and a cooling channel 201, so that the coolant is guided to the first channel section 204 for heat exchange.

[0129] An empty channel 410 is located on the side of the first channel section 204 away from the second channel section 205, occupying part of the space originally used for arranging the first channel section 204. As a result, the first channel section 204 is located close to the liquid inlet 202, and its volume is smaller than that of the third channel section 206.

[0130] The third channel section 206 is located near the liquid outlet 203 to maintain a large volume and enhance heat exchange capacity.

[0131] By setting up an empty channel 410, the space originally used for arranging the first channel segment 204 is occupied, meaning the volume of the first channel segment 204 is reduced. This reduction in volume decreases the amount of coolant at the inlet 202, thereby lowering the heat exchange capacity at that point. This design reduces the temperature difference between the battery module 100 at the inlet 202 and the outlet 203, ensuring a more uniform temperature distribution and improving battery performance and efficiency.

[0132] Meanwhile, by setting up an empty channel 410, the material used in the cold plate and the overall weight are reduced. This reduces the total weight of the battery pack and helps improve the system's energy efficiency ratio.

[0133] For example, the battery module 100 includes a plurality of battery cells. The plurality of battery cells are arranged sequentially along a second direction. For example, refer to Figure 1 As shown, multiple battery cells are arranged sequentially along the second direction, forming four columns. These four columns of battery cells form a battery module 100. Along the direction of use from the casing to the cover, the projected area of ​​the empty channel 410 on the cover is greater than 1 / 3 of the projected area of ​​a column of battery cells on the cover. This reduces the heat exchange capacity of the coolant inlet 202, thereby reducing the temperature difference between the coolant inlet 202 and the coolant outlet 203, and also reduces the weight of the battery pack, thus lowering the cost.

[0134] Secondly, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0135] The electrical equipment provided in this application can be an electric vehicle, an electric bicycle, an electric scooter, a robot, or a medical device. This application does not limit the specific type of electrical equipment.

[0136] It is understood that since the electrical equipment of this application adopts the technical solution of the above-described battery pack embodiment, it has at least the beneficial effects brought about by the technical solution of the above-described battery pack embodiment, which will not be elaborated here.

[0137] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: A housing having a receiving cavity open at one end; A cover that closes onto the opening; At least two battery modules (100) are located in the receiving cavity; at least two battery modules (100) are stacked along the direction from the housing to the cover; At least two cold plates are located in the receiving cavity; at least two cold plates are stacked along the direction from the housing to the cover; at least two cold plates and at least two battery modules (100) are stacked alternately. The cold plate has a cooling channel (201), which is connected to the liquid storage tank through a connection port; the opening size of the connection port of the cold plate near the cover is larger than the opening size of the connection port of the cold plate away from the cover.

2. The battery pack according to claim 1, characterized in that, The connection port includes a liquid inlet (202) and a liquid outlet (203); along a first direction intersecting the housing to the cover, the liquid inlet (202) and the liquid outlet (203) are respectively disposed at both ends of the cold plate; The two ends of the cooling channel (201) are respectively connected to the liquid inlet (202) and the liquid outlet (203); At least two of the cold plates include a first cold plate (210) and a second cold plate (220); the first cold plate (210) and the second cold plate (220) are spaced apart along the direction from the housing to the cover. The opening size of the liquid inlet (202) of the second cold plate (220) is larger than the opening size of the liquid inlet (202) of the first cold plate (210); and / or, the opening size of the liquid outlet (203) of the second cold plate (220) is larger than the opening size of the liquid outlet (203) of the first cold plate (210).

3. The battery pack according to claim 2, characterized in that, It also includes a connector for connecting the cooling channel (201) and the liquid storage tank through the connection port; The connector includes a first connecting part (310); a first connector and a second connector are sequentially provided on the first connecting part (310); the first connecting part (310) is connected to the liquid inlet (202) of the first cold plate (210) through the first connector; the first connecting part (310) is connected to the liquid inlet (202) of the second cold plate (220) through the second connector; And / or, the connector further includes a second connecting part (320), on which a third connector and a fourth connector are sequentially provided, the second connecting part (320) being connected to the liquid outlet (203) of the first cold plate (210) through the third connector; the second connecting part (320) being connected to the liquid outlet (203) of the second cold plate (220) through the fourth connector.

4. The battery pack according to claim 2, characterized in that, The opening size of the liquid inlet (202) of the second cold plate (220) is A, and the opening size of the liquid inlet (202) of the first cold plate (210) is B. A and B satisfy: A > 1.1B; And / or, the opening size of the liquid outlet (203) of the second cold plate (220) is C, and the opening size of the liquid outlet (203) of the first cold plate (210) is D, wherein C and D satisfy: C > 1.1D.

5. The battery pack according to any one of claims 2-4, characterized in that, Along the direction from the housing to the cover, the volume of the cooling channel (201) near the cold plate of the cover is greater than the volume of the cooling channel away from the cold plate of the cover.

6. The battery pack according to claim 5, characterized in that, It also includes a first sealing member and a second sealing member; the cold plate has a cooling cavity; the first sealing member is located in the cooling cavity of the first cold plate (210), and the second sealing member is located in the cooling cavity of the second cold plate (220); The first sealing component includes a first sealing part (207a) and a second sealing part (207b). Along a second direction intersecting the housing to the cover, the first sealing part (207a) is disposed in the cooling channel (201) of the first cold plate (210), near the end of the liquid inlet (202); the second sealing part (207b) is disposed in the cooling channel (201) of the first cold plate (210), away from the end of the liquid inlet (202). The second sealing member includes a third sealing part (207c) and a fourth sealing part (207d). Along a second direction intersecting the housing to the cover, the third sealing part (207c) is disposed in the cooling channel (201) of the second cold plate (220) near the liquid inlet (202); the fourth sealing part (207d) is disposed in the cooling channel (201) of the second cold plate (220) away from the liquid inlet (202). The first direction and the second direction intersect.

7. The battery pack according to claim 6, characterized in that, The extension length of the fourth blocking part (207d) along the second direction is less than the extension length of the second blocking part (207b) along the second direction.

8. The battery pack according to claim 6, characterized in that, The cooling channel (201) includes a first channel section (204), a second channel section (205), and a third channel section (206). The first channel segment (204), the second channel segment (205), and the third channel segment (206) all extend along the second direction; The two ends of the first channel segment (204) are respectively used to communicate with the liquid inlet (202) and the second channel segment (205); The two ends of the third channel segment (206) are respectively used to connect with the liquid outlet (203) and the second channel segment (205).

9. The battery pack according to claim 8, characterized in that, It also includes a separator (400) that extends along the second direction; The separator (400) divides the cooling cavity into an empty channel (410) and a cooling channel (201); along the first direction, the empty channel (410) is located on the side of the first channel segment (204) away from the second channel segment (205).

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-9.

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