Battery pack and electric equipment

Abstract

The embodiment of the utility model provides a battery pack and electric equipment. The battery pack comprises a shell, a flexible cold plate and a plurality of battery monomers, the shell is provided with a cavity, the flexible cold plate is arranged in the cavity, the shell is attached to the battery monomers, and the flexible cold plate abuts against the inner wall of the cavity; the flexible cold plate is provided with a liquid cooling channel used for transmitting a cooling medium. And when the battery monomers are subjected to thermal expansion, a cooling medium is introduced into the liquid cooling channel of the flexible cold plate to generate expansion. According to the application, the cooling and heat dissipation effects on the battery monomers can be improved, and the shell provides protection for the flexible cold plate, so that the flexible cold plate is prevented from being easily extruded and deformed due to direct contact with the battery monomers.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] A battery pack typically includes battery cells and a liquid cooling plate. The liquid cooling plate is connected to the battery cells to dissipate heat and cool the battery cells.

[0003] In the prior art, there are multiple battery cells distributed in an array. A liquid cooling plate is connected between two adjacent battery cells. A liquid cooling channel is provided in the liquid cooling plate. By introducing a cooling medium into the liquid cooling channel, the battery cells are cooled by heat exchange.

[0004] However, during the operation of the battery pack, the battery cells undergo thermal expansion, causing their surfaces to become curved, which reduces the area of the connection surface between the liquid cooling plate and the battery cells and reduces the cooling effect. Utility Model Content

[0005] In view of the above problems, the present invention is proposed to provide a battery pack and an electrical device that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a battery pack, comprising: a housing, a flexible cold plate, and a plurality of battery cells;

[0008] The shell is provided with a cavity, the flexible cold plate is arranged in the cavity, the shell is attached to the battery cell, and the flexible cold plate abuts against the inner wall of the cavity;

[0009] The flexible cold plate is provided with a liquid cooling channel for transmitting a cooling medium.

[0010] Optionally, the flexible cold plate comprises a first flexible membrane and a second flexible membrane connected to each other;

[0011] The first flexible membrane includes a first liquid-cooling part and a first pressing part connected to each other, and the second flexible membrane includes a second liquid-cooling part and a second pressing part connected to each other. The first liquid-cooling part and the second liquid-cooling part are spaced apart and enclosed to form the liquid-cooling channel. The first pressing part is attached to the second pressing part, and the side of the first liquid-cooling part and the second liquid-cooling part facing away from the liquid-cooling channel is in contact with the inner wall of the cavity. The first pressing part and the second pressing part are spaced apart from the inner wall of the cavity.

[0012] Optionally, the first flexible film includes a first heat-conducting film and a first insulating film connected to the periphery of the first heat-conducting film;

[0013] And / or, the second flexible film includes a second heat-conducting film and a second insulating film connected to an outer periphery of the second heat-conducting film, and the first heat-conducting film is connected to the second heat-conducting film.

[0014] Optionally, the battery pack further includes a buffer component, which is disposed between the shell and the flexible cold plate, and is connected to at least one of the first pressing portion and the second pressing portion.

[0015] Optionally, the housing is provided with a partition at a position corresponding to the buffer, the partition is formed with a first groove extending concavely away from the flexible cold plate, and the buffer is at least partially accommodated in the first groove.

[0016] Optionally, the partition divides the shell into a plurality of arcuate walls, the arcuate walls protrude toward the adjacent battery cells, and the arcuate walls are connected to the battery cells.

[0017] Optionally, the flexible cold plate is further provided with a water inlet and a water outlet, the water inlet and the water outlet are respectively communicated with the liquid cooling channel, and the water inlet and the water outlet are exposed to the shell.

[0018] Optionally, the battery pack has a first direction, the shell and the flexible cold plate both extend along the first direction, and along the first direction, at least one end of the flexible cold plate protrudes from the shell to set the water inlet and / or the water outlet.

[0019] Optionally, the battery pack has a first direction and a second direction intersecting each other, the shell extends along the first direction, and both ends of the shell along the second direction have ends, at least one of the ends is provided with a support rib, the support rib extends along the first direction, and the support rib is spaced apart from the flexible cold plate.

[0020] Optionally, the battery pack further includes a heat conductor connected between the shell and the battery cell.

[0021] Optionally, the battery cell has a first wall, the first wall is the wall with the largest surface area of the battery cell, and the shell is attached to the first wall.

[0022] In a second aspect, an embodiment of the present application provides an electrical device, which includes the battery pack.

[0023] In an embodiment of the present application, the battery pack includes a housing, a flexible cold plate, and a plurality of battery cells. The housing has a cavity, the flexible cold plate is disposed within the cavity, the housing is attached to the battery cells, and the flexible cold plate abuts the inner wall of the cavity. The flexible cold plate has a liquid cooling channel for transmitting a cooling medium. Thus, when a battery cell undergoes thermal expansion during operation of the battery pack, cooling medium flows into the liquid cooling channel of the flexible cold plate, causing the flexible cold plate to expand. Because the flexible cold plate is disposed within the cavity of the housing, the expanded flexible cold plate abuts the housing, maintaining a large contact area between the housing and the thermally expanding battery cell, achieving a better fit. This allows the cooling medium in the liquid cooling channel of the flexible cold plate to exchange heat with the battery cell through the housing, thereby improving the cooling and heat dissipation effect on the battery cell. This reduces the impact of the reduced area of the connection surface between the liquid cooling plate and the battery cell when the battery cell undergoes thermal expansion, thereby improving the thermal management of the battery pack. Furthermore, the housing protects the flexible cold plate, preventing it from direct contact with the battery cells, which could cause it to be squeezed and deformed when the cells expand. Furthermore, the flexible cold plate can smoothly control its expansion by adjusting the amount of cooling medium flowing into the liquid cooling channel, thereby adjusting to the degree of battery cell expansion, providing greater flexibility and adaptability.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic structural diagram of a thermal management component described in an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of the decomposed structure of a thermal management component described in an embodiment of the present application;

[0028] Figure 3 This is a thermal management component described in an embodiment of the present application. Figure 1 Schematic diagram of the structure of section A-A;

[0029] Figure 4 1 is a schematic structural diagram of a shell of a thermal management component according to an embodiment of the present application;

[0030] Figure 5 The shell of a thermal management component described in the embodiment of the present application Figure 5Schematic diagram of the structure of the B-B section;

[0031] Figure 6 1 is a schematic structural diagram of a flexible cold plate of a thermal management assembly according to an embodiment of the present application;

[0032] Figure 7 The flexible cold plate of a thermal management component described in the embodiment of the present application Figure 6 Schematic diagram of the structure of the C-C section;

[0033] Figure 8 This is a partial cross-sectional enlarged structural diagram of a flexible cold plate of a thermal management assembly according to an embodiment of the present application;

[0034] Figure 9 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0035] Figure 10 This is a schematic diagram of the exploded structure of a battery pack described in an embodiment of the present application.

[0036] Figure numerals: 10 - shell; 20 - flexible cold plate; 30 - battery cell; 11 - cavity; 21 - liquid cooling channel; 22 - first flexible membrane; 23 - second flexible membrane; 24 - first liquid cooling part; 25 - first pressing part; 26 - second liquid cooling part; 27 - second pressing part; 221 - first heat-conducting film; 222 - first insulating film; 231 - second heat-conducting film; 232 - second insulating film; 28 - buffer; 12 - partition; 17 - curved wall; 13 - water inlet; 14 - water outlet; 15 - end; 16 - supporting rib; 31 - heat-conducting part; 32 - first wall; X - first direction; Y - second direction. DETAILED DESCRIPTION

[0037] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0039] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] Reference Figures 1 to 10 , shows a schematic structural diagram of a battery pack according to an embodiment of the present application, wherein the battery pack may specifically include: a housing 10, a flexible cold plate 20, and a plurality of battery cells 30;

[0043] The housing 10 is provided with a cavity 11 , and the flexible cold plate 20 is disposed in the cavity 11 . The housing 10 is attached to the battery cell 30 , and the flexible cold plate 20 abuts against the inner wall of the cavity 11 .

[0044] The flexible cold plate 20 is provided with a liquid cooling channel 21 for transmitting a cooling medium.

[0045] In the embodiment of the present application, during battery pack operation, when the battery cells 30 thermally expand, cooling medium is introduced into the liquid cooling channels 21 of the flexible cold plate 20, causing the flexible cold plate 20 to expand. Because the flexible cold plate 20 is disposed within the cavity 11 of the housing 10, the expanded flexible cold plate 20 abuts the housing 10, maintaining a large contact area between the housing 10 and the thermally expanded battery cells 30, achieving a good fit. This allows the cooling medium in the liquid cooling channels 21 of the flexible cold plate 20 to exchange heat with the battery cells 30 through the housing 10, improving the cooling and heat dissipation of the battery cells 30. This reduces the impact on the cooling effect caused by the reduced area of the connection surface between the liquid cooling plate and the battery cells 30 during thermal expansion, thereby improving the thermal management of the battery pack. Furthermore, the housing 10 provides protection for the flexible cold plate 20, preventing it from directly contacting the battery cells 30 and potentially being squeezed and deformed by the expansion of the battery cells 30. Furthermore, the flexible cold plate 20 can smoothly control the expansion degree of the flexible cold plate 20 by adjusting the amount of cooling medium introduced into the liquid cooling channel 21 , so as to adjust the expansion degree of the battery cell 30 , thereby having good flexibility and adaptability.

[0046] In the embodiment of the present application, specifically, the thickness of the flexible cold plate 20 is less than the thickness of the housing 10 between the liquid cooling channels 21 of the flexible cold plate 20 and the cooling medium. Therefore, the flexible cold plate 20 can be easily installed within the housing 10, making the assembly operation simpler and more convenient, thereby improving assembly efficiency.

[0047] Specifically, in the embodiment of the present application, the housing 10 is attached to the battery cell 30. The spacing between two adjacent battery cells 30 can be set to be close to the thickness of the housing 10. The housing 10 is connected between the two adjacent battery cells 30 so that the housing 10 is attached to the battery cell 30. In addition, the attachment between the housing 10 and the battery cell 30 can be achieved by providing an adhesive such as a colloid. The adhesive such as a colloid is provided between the housing 10 and the battery cell 30 to adhere the housing 10 to the battery cell 30 through the adhesive such as a colloid, thereby achieving a relatively stable and reliable attachment between the housing 10 and the battery cell 30. For example, the adhesive can be an adhesive glue, a structural adhesive, a thermally conductive adhesive, etc. The embodiment of the present application does not limit the specific type of the adhesive.

[0048] In the embodiment of the present application, for example, the material of the housing 10 can be aluminum, which can have the advantages of light weight, high thermal conductivity, low cost, and good heat exchange effect. In addition, the material of the housing 10 can also be aluminum alloy or glass fiber composite material, etc. The embodiment of the present application does not limit the specific material of the housing 10.

[0049] For example, in an embodiment of the present application, the flexible cold plate 20 may be partially located in the cavity 11 of the shell 10. For example, the end 15 of the flexible cold plate 20 may be exposed to the shell 10, so as to facilitate setting the water inlet and outlet 14 at the exposed end 15 of the flexible cold plate 20. In addition, it is convenient to install the flexible cold plate 20 in the shell 10, thereby improving assembly efficiency. In addition, the flexible cold plate 20 may also be entirely disposed in the cavity 11 of the shell 10, and the water inlet and outlet 14 may pass through the shell 10 and be connected to the flexible cold plate 20. The embodiment of the present application may not limit the specific arrangement of the flexible cold plate 20. On the other hand, the cavity 11 of the shell 10 may be a cavity 11 that is not closed at both ends, or it may be a closed cavity 11. The embodiment of the present application may not limit the specific type of the shell 10.

[0050] In the embodiment of the present application, for example, the material of the flexible cold plate 20 can be at least one of copper foil, aluminum foil, polyamide resin (PA) or polyethylene terephthalate plastic (PET). The embodiment of the present application does not limit the specific material of the flexible cold plate 20.

[0051] For example, in the embodiment of the present application, the multiple battery cells 30 can be arranged in an array. In addition, the multiple battery cells 30 can be randomly distributed. The embodiment of the present application does not limit the specific arrangement of the battery cells 30. The battery cells 30 can be lithium-ion cells, polymer lithium cells, lithium iron phosphate cells, etc. The embodiment of the present application does not limit the specific type of battery cells 30.

[0052] Optionally, in an embodiment of the present application, the flexible cold plate 20 includes a first flexible membrane 22 and a second flexible membrane 23 connected to each other; the first flexible membrane 22 includes a first liquid-cooling part 24 and a first pressing part 25 connected to each other, and the second flexible membrane 23 includes a second liquid-cooling part 26 and a second pressing part 27 connected to each other. The first liquid-cooling part 24 and the second liquid-cooling part 26 are spaced apart and enclosed to form a liquid-cooling channel 21. The first pressing part 25 is attached to the second pressing part 27, and the first liquid-cooling part 24 and the second liquid-cooling part 26 are in contact with the inner wall of the cavity 11 on one side away from the liquid-cooling channel 21. The first pressing part 25 and the second pressing part 27 are spaced apart from the inner wall of the cavity 11. In this way, the flexible cold plate 20 is formed by interconnecting the first flexible membrane 22 and the second flexible membrane 23, the liquid cooling channel 21 is formed by enclosing the first liquid cooling part 24 and the second liquid cooling part 26, and the liquid cooling channel 21 is divided into multiple flow channels by the first pressing part 25 being attached to the second pressing part 27, so as to form a bow-shaped liquid cooling channel 21, so that the cooling medium can circulate in the bow-shaped liquid cooling channel 21.

[0053] For example, in an embodiment of the present application, in the production process, the first flexible film 22 and the second flexible film 23 can be first arranged to be spaced apart, and then the edge positions of the first flexible film 22 and the second flexible film 23 are heat pressed to achieve the connection between the first flexible film 22 and the second flexible film 23. Then, heat pressing is performed in the middle area of the first flexible film 22 and the second flexible film 23 to form multiple sections of heat pressing parts to form a bow-shaped liquid cooling channel 21. In actual applications, according to the thermal management requirements of different areas in the battery pack, the heat pressing area can be flexibly set to form liquid cooling channels 21 of different shapes and structures, thereby improving the thermal management effect. For example, the heat pressing part extends along the length direction of the flexible cold plate 20, that is, the first direction X, and the multiple heat pressing parts are spaced apart along the width direction of the flexible cold plate 20, that is, the second direction Y.

[0054] Optionally, in the embodiment of the present application, the first flexible film 22 includes a first thermally conductive film 221 and a first insulating film 222 connected to the outer periphery of the first thermally conductive film 221; and / or the second flexible film 23 includes a second thermally conductive film 231 and a second insulating film 232 connected to the outer periphery of the second thermally conductive film 231, with the first thermally conductive film 221 connected to the second thermally conductive film 231. This eliminates the need for a separate insulating layer to provide insulation protection for the flexible cold plate 20, reduces production costs, and improves the electrical safety of the flexible cold plate 20. Specifically, the first flexible film 22 is formed by the first thermally conductive film 221 and the first insulating film 222. The first flexible film 22 improves the heat exchange efficiency between the flexible cold plate 20 and the housing 10 through the first thermally conductive film 221, thereby improving the thermal conductivity of the flexible cold plate 20 and thus enhancing the cooling effect. Furthermore, the first insulating film 222 provides insulation between the flexible cold plate 20 and the housing 10, providing the flexible cold plate 20 with good insulation performance, thereby preventing damage to the flexible cold plate 20 when the battery cells 30 leak. In other words, the first flexible film 22 provides the flexible cold plate 20 with good thermal conductivity and insulation performance.

[0055] Alternatively, in the embodiment of the present application, the second flexible film 23 is formed by the second thermally conductive film 231 and the second insulating film 232. The second flexible film 23 improves the heat exchange efficiency between the flexible cold plate 20 and the housing 10 through the second thermally conductive film 231, thereby improving the thermal conductivity of the flexible cold plate 20 and thus enhancing the cooling effect. Furthermore, the second insulating film 232 provides insulation between the flexible cold plate 20 and the housing 10, thereby providing the flexible cold plate 20 with better insulation performance and preventing damage to the flexible cold plate 20 when the battery cells 30 leak. In other words, the second flexible film 23 provides the flexible cold plate 20 with better thermal conductivity and insulation performance.

[0056] Furthermore, in the embodiment of the present application, the first flexible film 22 may include a first thermally conductive film 221 and a first insulating film 222 connected to the outer periphery of the first thermally conductive film 221, and the second flexible film 23 may include a second thermally conductive film 231 and a second insulating film 232 connected to the outer periphery of the second thermally conductive film 231. This allows both the first flexible film 22 and the second flexible film 23 to have excellent thermal conductivity and insulation properties, further improving the thermal conductivity of both sides of the flexible cold plate 20 and ensuring excellent insulation properties on both sides of the flexible cold plate 20. When the first flexible film 22 includes the first thermally conductive film 221 and the first insulating film 222 connected to the outer periphery of the first thermally conductive film 221, and the second flexible film 23 includes the second thermally conductive film 231 and the second insulating film 232 connected to the outer periphery of the second thermally conductive film 231, the first thermally conductive film 221 is connected to the second thermally conductive film 231, and the first thermally conductive film 221 and the second thermally conductive film 231 enclose a liquid cooling channel 21.

[0057] Optionally, in an embodiment of the present application, the battery pack further includes a buffer 28, which is disposed between the shell 10 and the flexible cold plate 20, and is connected to at least one of the first pressing portion 25 and the second pressing portion 27. Since the first pressing portion 25 and the second pressing portion 27 are in contact with each other, a recessed structure is formed relative to the first liquid-cooling portion 24 and the second liquid-cooling portion 26. Therefore, a buffer 28 is provided at at least one of the first pressing portion 25 and the second pressing portion 27 between the shell 10 and the flexible cold plate 20 to prevent the position on the shell 10 corresponding to the first pressing portion 25 or the second pressing portion 27 from being easily recessed when subjected to external force. Specifically, when the shell 10 is squeezed by the expanded battery cell 30, the squeezing force on the shell 10 can be buffered by the buffer 28. Specifically, the buffer 28 can undergo elastic deformation to provide a buffering force.

[0058] For example, in the embodiment of the present application, the buffer 28 can be a strip structure, and the buffer 28 extends along the length direction of the flexible cold plate 20, that is, the first direction X, so as to provide a buffering effect to a larger area of the shell 10. For example, the buffer 28 can be a foam strip, a rubber strip or a silicone strip, etc., and the embodiment of the present application does not limit the specific type of the buffer 28. For example, the shape of the buffer 28 can be wavy or zigzag, etc., which can make the buffer 28 have better deformation performance in shape and structure, and make the buffer 28 have better structural stability. In addition, the elastic modulus of the buffer 28 can be set according to the different needs of different battery packs during operation, and the embodiment of the present application does not limit the elastic modulus of the buffer 28.

[0059] Optionally, in the embodiment of the present application, the housing 10 is provided with a partition 12 at a position corresponding to the buffer 28. The partition 12 is formed with a first groove that extends concavely away from the flexible cold plate 20, and the buffer 28 is at least partially accommodated in the first groove. In this way, the partition 12 acts as a limiter for the buffer 28, so that the buffer 28 is accommodated in the first groove of the partition 12. For example, the buffer 28 is engaged with the partition 12, preventing the buffer 28 from easily sliding and deviating, thereby providing the buffer 28 with better stability. In addition, the partition 12 can also be used to divide the housing 10 into multiple smaller areas, thereby preventing the outer surface of the housing 10 from easily deforming significantly and reducing the degree of deformation caused by external forces on the housing 10.

[0060] Specifically, the partition 12 further forms a second groove that extends concavely toward the flexible cold plate 20 . The second groove is provided on both sides of the first groove along the second direction Y. Thus, the partition 12 has a wavy structure to partition the housing 10 .

[0061] In the embodiment of the present application, the partition 12 optionally divides the housing 10 into a plurality of curved walls 17, which protrude toward adjacent battery cells 30 and are connected to the battery cells 30. Specifically, in actual applications, to reduce deformation caused by thermal expansion of the battery cells 30, the side surfaces of the battery cells 30 are typically configured as concave surfaces. To ensure that the housing 10 fits the battery cells 30 more closely when assembled in the battery pack, the partition 12 divides the housing 10 into a plurality of curved walls 17 that protrude toward the battery cells 30, thereby improving the fit between the housing 10 and the battery cells 30. This reduces bubbles generated during assembly of the housing 10 and the battery cells 30 due to poor flatness, reduces the thermal resistance between the flexible cold plate 20, the housing 10, and the battery cells 30, and improves heat exchange efficiency.

[0062] Optionally, in the embodiment of the present application, the flexible cold plate 20 is further provided with a water inlet 13 and a water outlet 14, which are respectively connected to the liquid cooling channel 21, and the water inlet 13 and the water outlet 14 are exposed to the housing 10. In this way, the cooling medium is introduced into the liquid cooling channel 21 through the water inlet 13, and the cooling medium is output from the liquid cooling channel 21 through the water outlet 14, so that the cooling medium circulates in the liquid cooling channel 21. In addition, the water inlet 13 and the water outlet 14 are exposed to the housing 10, which facilitates the connection of the water inlet 13 and the water outlet 14 to an external water pipe, thereby improving assembly efficiency.

[0063] For example, in an embodiment of the present application, the water outlet 14 and the water inlet 13 can be located on the same side of the flexible cold plate 20, which facilitates assembly of the water outlet 14 and the water inlet 13 on the same side, thereby improving assembly efficiency. In addition, the water outlet 14 and the water inlet 13 can also be located on either side of the flexible cold plate 20, respectively, to facilitate the arrangement of the water outlet 14 and the water inlet 13 to adapt to the specific installation position of the flexible cold plate 20 in the battery pack, thereby providing greater installation flexibility. The embodiment of the present application does not limit the specific arrangement of the water outlet 14 and the water inlet 13.

[0064] In the embodiment of the present application, for example, the number of water inlets 13 can be 1, 2, 3, etc., and the embodiment of the present application does not limit the specific number of water inlets 13. Similarly, the number of water outlets 14 can be 1, 2, 3, etc., and the embodiment of the present application does not limit the specific number of water outlets 14.

[0065] Optionally, in an embodiment of the present application, the battery pack has a first direction X, the shell 10 and the flexible cold plate 20 both extend along the first direction X, and along the first direction X, at least one end of the flexible cold plate 20 protrudes from the shell 10 to set the water inlet 13 and / or the water outlet 14. Specifically, the flexible cold plate 20 extends along the first direction X and has a first end and a second end that are relatively arranged, wherein, when the first end of the flexible cold plate 20 protrudes from the shell 10, it is convenient to set the water inlet 13 and the water outlet 14 at the first end. Alternatively, when the second end of the flexible cold plate 20 protrudes from the shell 10, it is convenient to set the water inlet 13 and the water outlet 14 at the second end. In addition, it is also possible to set the first end and the second end of the flexible cold plate 20 to protrude from the shell 10, so as to facilitate setting the water inlet 13 at the first end and the water outlet 14 at the second end, or to set the water outlet 14 at the first end and the water inlet 13 at the second end. The embodiment of the present application does not limit the specific configuration of the flexible cold plate 20 and the specific configuration of the corresponding water inlet 13 and water outlet 14 .

[0066] In an embodiment of the present application, the battery pack optionally has intersecting first and second directions X and Y, with the housing 10 extending along the first direction X. Both ends of the housing 10 along the second direction Y have end portions 15, and at least one of the end portions 15 is provided with support ribs 16. The support ribs 16 extend along the first direction X, and the support ribs 16 are spaced apart from the flexible cold plate 20. In this manner, the support ribs 16 support at least one of the end portions 15 of the housing 10, preventing the end portions 15 of the housing 10 from being easily deformed by compression from the battery cells, thereby improving the structural strength and overall structural stability of the housing 10. Specifically, the support ribs 16 extend along the first direction X, so that the support ribs 16 have a larger area in the direction in which the housing 10 extends, further improving the support stability of the end portions 15 of the housing 10. The support ribs 16 are spaced apart from the flexible cold plate 20 so that there is a gap between the support ribs 16 and the flexible cold plate 20. This prevents the support ribs 16 from touching the flexible cold plate 20 when the end 15 of the shell 10 is squeezed, thereby preventing the flexible cold plate 20 from being easily damaged. This also prevents the support ribs 16 from interfering with the flexible cold plate 20.

[0067] Optionally, in an embodiment of the present application, the battery pack further includes a heat conductor 31, which is connected between the housing 10 and the battery cells 30. In this way, the heat conductor 31 can be used as a heat conduction medium, and the heat generated by the battery cells 30 can be transferred to the housing 10 more quickly through the heat conductor 31, so that the flexible cold plate 20 located in the cavity 11 of the housing 10 absorbs the heat generated by the battery cells 30, thereby improving heat exchange efficiency and enhancing the cooling effect. Furthermore, the heat conductor 31 can also fill the gap between the housing 10 and the battery cells 30, reducing the thermal resistance between the two and further improving heat exchange efficiency.

[0068] For example, in the embodiment of the present application, the thermal conductive member 31 may be a thermal conductive structural adhesive, a thermal conductive gel, a thermal conductive pad, etc. The embodiment of the present application does not limit the specific type of the thermal conductive member 31. The use of a thermal conductive structural adhesive can ensure that the thermal conductive member 31 is more stably bonded between the housing 10 and the battery cell 30, preventing the thermal conductive member 31 from separating from the housing 10 or the battery cell 30.

[0069] In the embodiment of the present application, the battery cell 30 optionally has a first wall 32, which is the wall with the largest surface area of the battery cell 30, and the housing 10 is attached to the first wall 32. In this way, the housing 10 is attached to the first wall 32 with the largest surface area of the battery cell 30, so that the housing 10 and the battery cell 30 have a larger contact area, thereby providing a larger heat exchange area, further improving the heat exchange efficiency, and having a better cooling and heat dissipation effect on the battery cell 30.

[0070] In summary, the battery pack described in the embodiments of the present application can at least include the following advantages:

[0071] In an embodiment of the present application, the battery pack includes a housing, a flexible cold plate, and a plurality of battery cells. The housing has a cavity, the flexible cold plate is disposed within the cavity, the housing is attached to the battery cells, and the flexible cold plate abuts the inner wall of the cavity. The flexible cold plate has a liquid cooling channel for transmitting a cooling medium. Thus, when a battery cell undergoes thermal expansion during operation of the battery pack, cooling medium flows into the liquid cooling channel of the flexible cold plate, causing the flexible cold plate to expand. Because the flexible cold plate is disposed within the cavity of the housing, the expanded flexible cold plate abuts the housing, maintaining a large contact area between the housing and the thermally expanding battery cell, achieving a better fit. This allows the cooling medium in the liquid cooling channel of the flexible cold plate to exchange heat with the battery cell through the housing, thereby improving the cooling and heat dissipation effect on the battery cell. This reduces the impact of the reduced area of the connection surface between the liquid cooling plate and the battery cell when the battery cell undergoes thermal expansion, thereby improving the thermal management of the battery pack. Furthermore, the housing protects the flexible cold plate, preventing it from direct contact with the battery cells, which could cause it to be squeezed and deformed when the cells expand. Furthermore, the flexible cold plate can smoothly control its expansion by adjusting the amount of cooling medium flowing into the liquid cooling channel, thereby adjusting to the degree of battery cell expansion, providing greater flexibility and adaptability.

[0072] An embodiment of the present application further provides an electrical device, which includes the battery pack.

[0073] For example, in the embodiments of the present application, the electrical equipment may be a vehicle, an energy storage structure, or an aircraft, etc., and the embodiments of the present application do not limit the specific type of the electrical equipment. The vehicles may specifically include small cars, medium-sized cars, three-box cars, trucks, trailers, CDVs (CXr DerivedVXn, vans based on sedan platforms), MPVs (multi-purpose vehicles), SUVs (sport utility vehicles), etc. The embodiments of the present application do not limit this.

[0074] The electrical equipment described in the embodiments of the present application may have at least the following advantages:

[0075] In an embodiment of the present application, the electrical device includes the battery pack, which includes a housing, a flexible cold plate, and a plurality of battery cells. The housing has a cavity, the flexible cold plate is disposed within the cavity, the housing is attached to the battery cells, and the flexible cold plate abuts the inner wall of the cavity. The flexible cold plate has a liquid cooling channel for transmitting a cooling medium. Thus, when the battery cells undergo thermal expansion during operation of the battery pack, cooling medium flows into the liquid cooling channel of the flexible cold plate, causing the flexible cold plate to expand. Because the flexible cold plate is disposed within the cavity of the housing, the expanded flexible cold plate abuts the housing, maintaining a large contact area between the housing and the thermally expanded battery cells, achieving a good fit. This allows the cooling medium in the liquid cooling channel of the flexible cold plate to exchange heat with the battery cells through the housing, thereby improving the cooling and heat dissipation effect on the battery cells. This reduces the impact on cooling efficiency caused by the reduced surface area of the liquid cooling plate connecting to the battery cells during thermal expansion, thereby improving the thermal management of the battery pack. Furthermore, the housing protects the flexible cold plate, preventing it from direct contact with the battery cells, which could cause it to be squeezed and deformed when the cells expand. Furthermore, the flexible cold plate can smoothly control its expansion by adjusting the amount of cooling medium flowing into the liquid cooling channel, thereby adjusting to the degree of battery cell expansion, providing greater flexibility and adaptability.

[0076] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The battery pack comprises: a housing (10), a flexible cold plate (20), and a plurality of battery cells (30); The shell (10) is provided with a cavity (11), the flexible cold plate (20) is arranged in the cavity (11), the shell (10) is attached to the battery cell (30), and the flexible cold plate (20) abuts against the inner wall of the cavity (11); The flexible cold plate (20) is provided with a liquid cooling channel (21) for transmitting a cooling medium.

2. The battery pack according to claim 1, wherein: The flexible cold plate (20) includes a first flexible film (22) and a second flexible film (23) connected to each other; The first flexible membrane (22) includes a first liquid cooling portion (24) and a first pressing portion (25) connected to each other, and the second flexible membrane (23) includes a second liquid cooling portion (26) and a second pressing portion (27) connected to each other. The first liquid cooling portion (24) and the second liquid cooling portion (26) are spaced apart and enclosed to form the liquid cooling channel (21). The first pressing portion (25) is attached to the second pressing portion (27), and the first liquid cooling portion (24) and the second liquid cooling portion (26) are in contact with the inner wall of the cavity (11) on the side facing away from the liquid cooling channel (21). The first pressing portion (25) and the second pressing portion (27) are spaced apart from the inner wall of the cavity (11).

3. The battery pack according to claim 2, wherein: The first flexible film (22) comprises a first heat-conducting film (221) and a first insulating film (222) connected to the outer periphery of the first heat-conducting film (221); And / or, the second flexible film (23) includes a second heat-conducting film (231) and a second insulating film (232) connected to the periphery of the second heat-conducting film (231), and the first heat-conducting film (221) is connected to the second heat-conducting film (231).

4. The battery pack according to claim 2, wherein: The battery pack further includes a buffer component (28), which is arranged between the shell (10) and the flexible cold plate (20), and the buffer component (28) is connected to at least one of the first pressing portion (25) and the second pressing portion (27).

5. The battery pack according to claim 4, characterized in that: The housing (10) is provided with a partition (12) at a position corresponding to the buffer (28); the partition (12) is formed with a first groove extending in a direction away from the flexible cold plate (20); and the buffer (28) is at least partially accommodated in the first groove.

6. The battery pack according to claim 5, characterized in that: The partition (12) divides the housing (10) into a plurality of arcuate walls (17), the arcuate walls (17) protrude toward the adjacent battery cells (30), and the arcuate walls (17) are connected to the battery cells (30).

7. The battery pack according to claim 1, wherein: The flexible cold plate (20) is further provided with a water inlet (13) and a water outlet (14), wherein the water inlet (13) and the water outlet (14) are respectively connected to the liquid cooling channel (21), and the water inlet (13) and the water outlet (14) are exposed to the shell (10).

8. The battery pack according to claim 7, characterized in that: The battery pack has a first direction (X), the shell (10) and the flexible cold plate (20) both extend along the first direction (X), and along the first direction (X), at least one end of the flexible cold plate (20) protrudes from the shell (10) to provide the water inlet (13) and / or the water outlet (14).

9. The battery pack according to claim 1, wherein: The battery pack has a first direction (X) and a second direction (Y) intersecting each other, the shell (10) extends along the first direction (X), and both ends of the shell (10) along the second direction (Y) have end portions (15), at least one of the end portions (15) is provided with a support rib (16), the support rib (16) extends along the first direction (X), and the support rib (16) is spaced apart from the flexible cold plate (20).

10. The battery pack according to claim 1, wherein: The battery pack further comprises a heat conducting member (31), wherein the heat conducting member (31) is connected between the housing (10) and the battery cell (30).

11. The battery pack according to claim 1, wherein: The battery cell (30) has a first wall (32), the first wall (32) being the wall with the largest surface area of the battery cell (30), and the housing (10) is attached to the first wall (32).

12. An electrical device, characterized in that: The electrical equipment includes the battery pack according to any one of claims 1 to 11.

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