Battery pack and power device with same

Abstract

The utility model provides a battery pack and a power device with the same. The battery pack comprises a battery module, a battery pack and a battery pack, the first cold plate is arranged at the bottom of the battery module; the phase-change heat exchange part is arranged at the top of the battery module, a cavity is formed in the phase-change heat exchange part, and the cavity is filled with a phase-change material. According to the battery pack disclosed by the utility model, the first cold plate and the phase-change heat exchange piece are arranged and are matched with each other, so that the heat exchange efficiency of the battery pack can be improved, the service life of the battery pack can be prolonged, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power device manufacturing, in particular to a battery pack and a power device having the same. Background Art

[0002] In the existing battery pack, when the battery pack is at high temperature, it needs to be cooled down rapidly to prevent damage to the battery module, or when the battery pack is at low temperature, it needs to be heated up quickly to improve operating efficiency. Since the temperature inside the battery pack is affected by the external environment, the temperature of the battery module cannot be adjusted according to the operating requirements of the battery module, thereby affecting the service life and safety of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which can improve the heat exchange efficiency of the battery pack.

[0004] The utility model also provides a power device having the battery pack.

[0005] According to an embodiment of the utility model, the battery pack includes: a battery module; a first cold plate, which is arranged at the bottom of the battery module; a phase change heat exchanger, which is arranged at the top of the battery module, and a cavity is formed in the phase change heat exchanger, and the cavity is filled with phase change material.

[0006] According to the battery pack of the present invention, a first cold plate and a phase change heat exchange element are provided. The cooperation between the first cold plate and the phase change heat exchange element can improve the heat exchange efficiency of the battery pack, thereby increasing the service life of the battery pack and improving the safety of use.

[0007] According to some embodiments of the present utility model, the phase change heat exchange element includes: a heat exchange tube, the heat exchange tube extends along a first direction in a horizontal plane, the number of the heat exchange tubes is multiple, the multiple heat exchange tubes are arranged at intervals along a second direction in the horizontal plane, the second direction intersects with the first direction, and the phase change material is filled in the heat exchange tube.

[0008] According to some optional embodiments of the present utility model, the phase change heat exchange element also includes: a connecting pipe, which is arranged on one side of the heat exchange tube in the first direction, the connecting pipe extends along the second direction and is connected to one end of multiple heat exchange tubes in the first direction, and the connecting pipe is in communication with multiple heat exchange tubes.

[0009] According to some embodiments of the present utility model, the heat exchange tube includes: a plurality of straight pipe sections and at least one curved pipe section, the straight pipe sections extend along the first direction, the curved pipe sections are connected between adjacent straight pipe sections, and in the up and down directions, at least a portion of the curved pipe sections is higher or lower than the straight pipe sections.

[0010] According to some embodiments of the utility model, an escape space is defined between adjacent heat exchange tubes, an explosion-proof valve is provided on the battery module, and the explosion-proof valve is arranged in the escape space.

[0011] According to some embodiments of the present utility model, a signal acquisition component is provided between the battery module and the phase-change heat element, and the phase-change heat element is provided on the signal acquisition component.

[0012] According to some optional embodiments of the present invention, there are multiple signal acquisition components, the signal acquisition components extend along the first direction, and the multiple signal acquisition components are arranged at intervals along the second direction.

[0013] According to some embodiments of the utility model, a plurality of protrusions are provided on the signal acquisition component, the plurality of protrusions are arranged at intervals along the extension direction of the signal acquisition component, and the phase change heating element is supported on the protrusions.

[0014] According to some embodiments of the utility model, the battery pack includes: a fireproof board, which is arranged in the avoidance space to seal the explosion-proof valve of the battery module. There are multiple fireproof boards, and each of the avoidance spaces is provided with the fireproof board.

[0015] According to some embodiments of the utility model, the battery module includes a plurality of first modules, and the plurality of first modules are arranged at intervals along a second direction. The battery pack includes: a second cold plate, and the number of the second cold plates is multiple. The battery module is provided with the second cold plates on both side surfaces in the second direction and between adjacent first modules.

[0016] According to some embodiments of the present invention, the battery pack includes: a box body, a receiving cavity is provided in the box body, and the battery module is arranged in the receiving cavity.

[0017] The power device according to the embodiment of the second aspect of the utility model includes the battery pack according to the first aspect of the utility model.

[0018] According to the power device of the utility model, by setting the battery pack of the first embodiment, a first cold plate and a phase change heat exchange element are set in the battery pack. The first cold plate and the phase change heat exchange element cooperate to improve the heat exchange efficiency of the battery pack, thereby increasing the service life of the battery pack and improving the safety of use.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a partial schematic diagram of a battery pack according to an embodiment of the utility model;

[0021] Figure 2 is an exploded view of a battery pack according to an embodiment of the utility model;

[0022] Figure 3 yes Figure 2 Schematic diagram of the phase change heat exchange element and the fireproof plate shown in;

[0023] Figure 4 yes Figure 3 A schematic diagram of a phase change heat transfer element shown in ;

[0024] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0025] Figure 6 yes Figure 4 Schematic diagram of the heat exchange tube shown in;

[0026] Figure 7 yes Figure 2 Schematic diagram of the signal acquisition components shown in .

[0027] Reference numerals:

[0028] 100. Battery pack;

[0029] 10. Battery module; 11. First module; 12. Explosion-proof valve; 13. Terminal;

[0030] 20. First cold plate;

[0031] 30. Phase change heat exchange element; 31. Heat exchange tube; 311. Straight tube section; 312. Bend tube section; 32. Connecting tube; 33. Avoidance space;

[0032] 40. signal acquisition component; 41. convex portion; 42. flexible circuit board;

[0033] 50. Fireproof board;

[0034] 60. Box body;

[0035] 200. Car body floor. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Please refer to the following Figure 1-7 A battery pack 100 according to an embodiment of the present invention is described.

[0038] Reference Figure 1 and Figure 2 According to an embodiment of the present utility model, the battery pack 100 includes: a battery module 10, a first cold plate 20 and a phase change heat element 30.

[0039] Specifically, the first cold plate 20 is arranged at the bottom of the battery module 10; the phase change heat element 30 is arranged at the top of the battery module 10, and a cavity is formed in the phase change heat element 30, and the cavity is filled with phase change material. Phase change material refers to a substance that changes the state of matter and can provide latent heat without changing the temperature. Preferably, the phase change material can be three types: inorganic phase change material, organic phase change material and composite phase change material. Among them, inorganic phase change materials mainly include crystalline hydrated salts, molten salts, metals or alloys, etc.; organic phase change materials mainly include paraffin, acetic acid and other organic substances; composite phase change materials are a mixture of inorganic phase change materials and organic phase change materials, which can ensure that the phase change heat element 30 filled with phase change material has good heat exchange capacity.

[0040] The battery pack 100 of the utility model is provided with a first cold plate 20 and a phase change heat element 30. The first cold plate 20 and the phase change heat element 30 can cooperate to exchange heat on the top and bottom of the battery module 10, which can improve the heat exchange efficiency of the battery pack 100 and maintain the battery module 10 at an adapted operating temperature, thereby effectively preventing the battery module 10 from being damaged by overheating, and preventing the battery module 10 from being overcooled and affecting the operating efficiency, thereby increasing the service life of the battery pack 100 and improving the safety of use. At the same time, when the battery module 10 generates high temperature due to long-term operation, the phase change heat element 30 is arranged on the top of the battery module 10, which can directly absorb the heat of the battery module 10, thereby improving the cooling efficiency and ensuring the cooling effect. When the battery module 10 is operated in a low-temperature environment, the phase change material undergoes a phase change to provide latent heat, which can provide heat to the battery module 10, thereby having a heat preservation effect on the battery pack 100.

[0041] According to the battery pack 100 of the embodiment of the present invention, a first cold plate 20 and a phase change heat element 30 are provided. The first cold plate 20 and the phase change heat element 30 cooperate to improve the heat exchange efficiency of the battery pack 100, thereby increasing the service life of the battery pack 100 and improving the safety of use.

[0042] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 The phase change heat exchange element 30 includes: a heat exchange tube 31, the heat exchange tube 31 is along a first direction in a horizontal plane (such as Figure 3The heat exchange tubes 31 extend in the second direction in the horizontal plane (such as the front and rear direction shown in FIG. 1 ), and the number of the heat exchange tubes 31 is multiple, that is, the number of the heat exchange tubes 31 can be two, three, or four or more, and the multiple heat exchange tubes 31 extend in the second direction in the horizontal plane (such as Figure 3 The phase change materials are arranged in an interval manner in the left and right directions (as shown in the figure), the second direction intersects with the first direction, and the phase change material is filled in the heat exchange tube 31.

[0043] In this way, multiple heat exchange tubes 31 can ensure the heat exchange efficiency of the phase change heat exchange element 30, thereby further ensuring the constant temperature in the battery pack 100 and effectively ensuring the safe use of the battery pack 100. At the same time, multiple heat exchange tubes 31 are arranged at intervals, so that the heat exchange ranges of the heat exchange tubes 31 do not overlap with each other, thereby ensuring the maximum heat exchange area of ​​the phase change heat exchange element 30.

[0044] For example, as in Question 3 and Figure 4 As shown, the phase change heat exchange element 30 includes four heat exchange tubes 31 . The heat exchange tubes 31 extend in the front-to-back direction, and the four heat exchange tubes 31 are arranged at intervals in the left-to-right direction.

[0045] Furthermore, if Figure 3 and Figure 4 As shown, a temperature sensing device is provided on the heat exchange tube 31 of the phase change heat exchange element 30. Thus, the temperature inside the battery pack 100 can be sensed by the temperature sensing device, so as to obtain information on whether the phase change material undergoes phase change, and further the temperature inside the battery pack 100 can be monitored in real time.

[0046] According to some optional embodiments of the present invention, referring to Figure 3 and Figure 4 The phase change heat exchange element 30 further includes: a connecting pipe 32, the connecting pipe 32 is arranged on the heat exchange tube 31 in the first direction (such as Figure 3 The connecting pipe 32 is arranged along the second direction (as shown in the front-to-back direction). Figure 3 The connecting pipe 32 extends in the left-right direction (as shown) and is connected to one end of the plurality of heat exchange tubes 31 in the first direction, and the connecting pipe 32 is in communication with the plurality of heat exchange tubes 31.

[0047] In this way, the connecting pipe 32 connects multiple heat exchange tubes 31, so that the cavity inside the phase change heat exchange element 30 can be connected as a whole, and then the phase change material can flow in the cavity. At the same time, it can also facilitate the filling of the phase change material. Furthermore, the connecting pipe 32 and the heat exchange tube 31 cooperate to form a frame structure, thereby ensuring the structural strength of the phase change heat exchange element 30 and effectively avoiding damage to the phase change heat exchange element 30.

[0048] For example, Figure 3 and Figure 4As shown, the phase change heat exchange element 30 includes three connecting tubes 32, which are two short connecting tubes 32 and one long connecting tube 32. The connecting tubes 32 extend in the left-right direction, wherein the two short connecting tubes 32 are connected to the front side of the heat exchange tube 31, and each short connecting tube 32 is respectively connected to two heat exchange tubes 31, and the other long connecting tube 32 is connected to the rear side of the heat exchange tube 31, and the long connecting tube 32 connects four heat exchange tubes 31. Preferably, a plurality of flow channels are provided in the heat exchange tube 31, so that the heat exchange efficiency of the heat exchange tube 31 can be ensured, and the heat exchange tube 31 is welded to the connecting tube 32, so that the connection strength between the heat exchange tube 31 and the connecting tube 32 can be ensured.

[0049] According to some embodiments of the present invention, referring to Figure 4 , Figure 5 and Figure 6 The heat exchange tube 31 includes: a plurality of straight tube sections 311 and at least one curved tube section 312, the straight tube section 311 is along a first direction (such as Figure 4 The curved pipe section 312 extends in the front-to-back direction (as shown in the figure), and the curved pipe section 312 is connected between adjacent straight pipe sections 311. In the up-down direction, at least a portion of the curved pipe section 312 is higher or lower than the straight pipe section 311. In other words, a portion of the curved pipe section 312 may be higher or lower than the straight pipe section 311, or the entire curved pipe section 312 may be higher or lower than the straight pipe section 311.

[0050] In this way, the setting of the curved pipe section 312 can separate the phase change material in the cavity from the curved pipe section 312 to the straight pipe sections 311 on both sides, thereby avoiding the phase change heat exchange element 30 in the cavity. At the same time, the phase change material can move to the straight pipe section 311 through the curved pipe section 312, so that each straight pipe section 311 can be filled with phase change material.

[0051] For example, Figure 4 , Figure 5 and Figure 6 As shown, the straight pipe section 311 extends in the front-to-back direction, and each heat exchange tube 31 includes ten straight pipe sections 311 and nine curved pipe sections 312 . The curved pipe sections 312 are connected between adjacent straight pipe sections 311 , and portions of the curved pipe sections 312 are higher than the straight pipe sections 311 .

[0052] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 An escape space 33 is defined between adjacent heat exchange tubes 31, and an explosion-proof valve 12 is provided on the battery module 10, and the explosion-proof valve 12 is arranged in the escape space 33. Therefore, the escape space 33 leaves a space for the explosion-proof valve 12 to spray, so that the spray of the explosion-proof valve 12 can be prevented from spraying onto the heat exchange tube 31, so that when the battery module 10 is thermally runaway, the heat exchange function of the heat exchange tube 31 can still be guaranteed.

[0053] According to some optional embodiments of the present invention, referring to Figure 2 and Figure 3 A signal acquisition component 40 is provided between the battery module 10 and the phase change heat element 30, and the phase change heat element 30 is provided on the signal acquisition component 40. Therefore, it is not necessary to support the phase change heat element 30 on the battery module 10, so that the force on the battery module 10 can be reduced, and the phase change heat element 30 can be prevented from crushing the battery module 10.

[0054] Furthermore, if Figure 1 As shown, the top of the box 60 is integrated with the vehicle body floor 200, which can reduce the number of parts and components, reduce production costs, and improve the functionality of the vehicle body floor 200. Preferably, the signal acquisition component 40 is made of high-strength plastic, and the signal acquisition component 40 is connected to the top plate of the box 60 and the vehicle body floor 200 by heat riveting through structural adhesive, which can ensure the strength of the signal acquisition component 40 and enhance the overall strength of the battery pack 100.

[0055] According to some optional embodiments of the present invention, referring to Figure 2 and Figure 7 , the number of signal acquisition components 40 is multiple, that is, the number of signal acquisition components 40 can be two, three or four or more, and the signal acquisition components 40 are arranged along the first direction (such as Figure 2 The plurality of signal acquisition components 40 extend in a second direction (such as the front-to-back direction shown in FIG. Figure 2 The left and right directions as shown) are arranged at intervals.

[0056] In this way, multiple signal acquisition components 40 can ensure the supporting force of the phase change heat element 30, thereby effectively preventing the signal acquisition component 40 from being overloaded and deformed. At the same time, it can ensure that the signal acquisition component 40 strengthens the strength of the battery pack 100, thereby increasing the impact resistance of the box 60.

[0057] For example, Figure 2 and Figure 7 As shown, there are four signal acquisition components 40 , which extend in the front-to-back direction, and are arranged at intervals in the left-to-right direction, and each heat exchange tube 31 is supported on a signal acquisition component 40 .

[0058] According to some embodiments of the present invention, referring to Figure 2 and Figure 7 The signal acquisition component 40 is provided with a plurality of protrusions 41 , that is, the signal acquisition component 40 may be provided with two, three, four or more protrusions 41 , and the plurality of protrusions 41 are arranged at intervals along the extension direction of the signal acquisition component 40 , and the phase change heat element 30 is supported on the protrusions 41 .

[0059] In this way, the protrusion 41 separates the phase change heating element 30 from the flexible circuit board 42 of the signal acquisition component 40, thereby providing a layout space for the flexible circuit board 42, making it convenient for the flexible circuit board 42 to collect signals such as current and voltage of the battery module 10. Therefore, this structural design is reasonable and can simultaneously ensure the function of the signal acquisition component 40 to collect information and the function of supporting the phase change heating element 30.

[0060] For example, Figure 2 and Figure 7 As shown, the signal acquisition component 40 is provided with ten protrusions 41 , which protrude upwards and are arranged at intervals along the front-to-back direction. The lower surface of the phase change heat element 30 is supported on the upper end of the protrusion 41 .

[0061] According to some embodiments of the present invention, referring to Figure 2 and Figure 3 The battery pack 100 includes: a fireproof plate 50, which is arranged in the avoidance space 33 to cover the explosion-proof valve 12 of the battery module 10. The number of the fireproof plates 50 is multiple, that is, the number of the fireproof plates 50 can be two, three or four or more, and each avoidance space 33 is provided with a fireproof plate 50. Therefore, the fireproof plate 50 can cover the explosion-proof valve 12, so that the explosion-proof valve 12 can be protected from thermal runaway, thereby improving the safety performance of the battery pack 100.

[0062] For example, Figure 2 and Figure 3 As shown, there are four fireproof panels 50 , and each avoidance space 33 is provided with a fireproof panel 50 , which extends in the front-to-back direction.

[0063] According to some embodiments of the present invention, referring to Figure 2 The battery module 10 includes a plurality of first modules 11, that is, the number of the first modules 11 may be two, three, four or more, and the plurality of first modules 11 are arranged along the second direction (eg Figure 2 The battery pack 100 includes: a second cold plate (not shown in the figure), the number of the second cold plates is multiple, that is, the number of the second cold plates can be two, three or four or more, and the battery module 10 is provided with a second cold plate on both side surfaces in the second direction and between the adjacent first modules 11.

[0064] In this way, multiple first modules 11 can ensure the storage capacity of the battery module 10, thereby ensuring the endurance of the power device. At the same time, the second cold plate, the first cold plate 20 and the phase change heat element 30 cooperate with each other to further maintain the constant temperature in the box 60, thereby ensuring that the battery module 10 can operate under good working conditions. In addition, even if the power device is equipped with multiple battery modules 10, the second cold plate cooperates with the first cold plate 20 and the phase change heat element 30 to ensure the full-area cooling and temperature reduction requirements of the battery pack 100, thereby meeting the requirements of high-performance supercharging and vehicle power performance.

[0065] For example, Figure 2 As shown, the battery module 10 includes two first modules 11, the first modules 11 extend in the front-to-back direction, the two first modules 11 are arranged at intervals in the left-to-right direction, the second cold plate extends in the front-to-back direction and is arranged vertically, and the left and right surfaces of the battery module 10 and between adjacent first modules 11 are provided with second cold plates. Preferably, the second cold plate is a coupled cold plate, which can ensure the cooling efficiency of the second cold plate. At the same time, the second cold plate is bonded and connected to the battery module 10. This connection form is simple to operate and is convenient for improving assembly efficiency.

[0066] Furthermore, if Figure 1 and Figure 2 As shown, the first module 11 includes battery cells arranged in sequence along the front-to-back direction, and the battery cells are provided with poles 13 and explosion-proof valves 12. Thus, a plurality of battery cells are electrically connected through the poles 13 to form the first module 11, and at the same time, when the battery cells are in thermal runaway, the battery cells can release ejecta from the explosion-proof valves 12, thereby preventing the battery cells from exploding.

[0067] According to some embodiments of the present invention, referring to Figure 1 The battery pack 100 includes a box body 60, a receiving cavity is provided in the box body 60, and the battery module 10 is provided in the receiving cavity. Therefore, the box body 60 can provide effective protection for the battery module 10, thereby effectively preventing the battery module 10 from being damaged.

[0068] According to the power device of the second embodiment of the utility model, referring to Figure 1 , including the battery pack 100 of the first aspect of this embodiment.

[0069] According to the power device of the embodiment of the utility model, by setting the battery pack 100 of the first embodiment mentioned above, a first cold plate 20 and a phase change heat element 30 are set on the battery pack 100. The first cold plate 20 and the phase change heat element 30 cooperate to improve the heat exchange efficiency of the battery pack 100, thereby increasing the service life of the battery pack 100 and improving the safety of use.

[0070] Furthermore, the vehicle is provided with a temperature control system for the battery pack 100. The temperature control system collects the temperature inside the battery pack 100 through a signal acquisition component 40. The signal acquisition component 40 is arranged at the bottom, top and side of the battery module 10. After different signal acquisition components 40 detect the temperature of the battery module 10, for example, the signal acquisition component 40 at the bottom of the battery module 10 detects the temperature at the bottom of the battery module 10, the temperature control system compares the temperature collected by the signal acquisition component 40 with the preset temperature of the temperature control system. When the difference between the detected temperature value and the preset temperature value is greater than 35°C, the temperature control system starts the first cold plate 20 to cool the bottom of the battery module 10; or, the signal acquisition component 40 at the side of the battery module 10 detects the temperature at the side of the battery module 10, the temperature control system compares the signal acquisition component 40 with the preset temperature of the temperature control system. The temperature collected by the signal collection component 40 is compared with the preset temperature of the temperature control system. When the difference between the detected temperature value and the preset temperature value is greater than 35°C, the temperature control system starts the second cold plate to cool the side of the battery module 10; or, the signal collection component 40 at the top of the battery module 10 detects the temperature of the top of the battery module 10, and the temperature control system compares the temperature collected by the signal collection component 40 with the preset temperature of the temperature control system. When the difference between the detected temperature value and the preset temperature value is greater than 40°C, the temperature control system starts the phase change heat element 30 to cool the battery module 10.

[0071] In addition, when the first cold plate 20 and the second cold plate cool the bottom and sides of the battery at the same time, the signal acquisition component 40 will collect the temperature difference between the bottom and sides of the battery module 10. When the temperature difference is less than 1°C, the temperature control system will not adjust the cooling power of the first cold plate 20 and the second cold plate. When the temperature difference is greater than 2°C, the temperature control system will adjust the cooling power of the first cold plate 20 and the second cold plate to balance the temperature of the bottom and sides of the battery module 10.

[0072] Furthermore, when the temperature difference between the bottom of the battery module 10 and the temperature of the battery module 10 detected by the signal acquisition component 40 and the preset value is less than 10°C, the temperature control system controls the first cold plate 20 and / or the second cold plate to heat the battery module 10. At the same time, the temperature difference between the bottom and the side of the battery module 10 is detected again to adjust the heating power of the first cold plate 20 and the second cold plate. The temperature control system also compares the temperature difference between the pole 13 at the top of the battery module 10 and the preset temperature. When the temperature difference between the pole 13 and the preset temperature is less than 20°C, the phase change heating element 30 is controlled to be closed to increase the temperature of the pole 13.

[0073] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[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 spirit 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: include: Battery module; A first cold plate, the first cold plate is arranged at the bottom of the battery module; A phase change heat transfer element is arranged on the top of the battery module, a cavity is formed in the phase change heat transfer element, and the cavity is filled with a phase change material.

2. The battery pack according to claim 1, characterized in that: The phase change heat element comprises: A heat exchange tube, wherein the heat exchange tube extends along a first direction in a horizontal plane, the number of the heat exchange tubes is multiple, the multiple heat exchange tubes are arranged at intervals along a second direction in the horizontal plane, the second direction intersects with the first direction, and the phase change material is filled in the heat exchange tube.

3. The battery pack according to claim 2, characterized in that: The phase change heat exchange element further includes: a connecting pipe, which is arranged on one side of the heat exchange tube in the first direction, extends along the second direction and is connected to one end of the plurality of heat exchange tubes in the first direction, and is in communication with the plurality of heat exchange tubes.

4. The battery pack according to claim 2, characterized in that: The heat exchange tube includes: a plurality of straight tube sections and at least one curved tube section, wherein the straight tube sections extend along the first direction, the curved tube sections are connected between adjacent straight tube sections, and in the up and down direction, at least part of the curved tube section is higher or lower than the straight tube section.

5. The battery pack according to claim 2, characterized in that: An escape space is defined between adjacent heat exchange tubes, and an explosion-proof valve is provided on the battery module, and the explosion-proof valve is arranged in the escape space.

6. The battery pack according to claim 2, characterized in that: A signal acquisition component is provided between the battery module and the phase-change heat element, and the phase-change heat element is provided on the signal acquisition component.

7. The battery pack according to claim 6, characterized in that: There are multiple signal acquisition components, each of which extends along the first direction, and multiple signal acquisition components are arranged at intervals along the second direction.

8. The battery pack according to claim 6, characterized in that: The signal acquisition component is provided with a plurality of convex parts, the plurality of convex parts are arranged at intervals along the extension direction of the signal acquisition component, and the phase change heat element is supported on the convex parts.

9. The battery pack according to claim 5, characterized in that: include: A fireproof board is arranged in the avoidance space to cover the explosion-proof valve of the battery module. There are multiple fireproof boards, and each of the avoidance spaces is provided with the fireproof board.

10. The battery pack according to claim 1, characterized in that: The battery module includes a plurality of first modules, and the plurality of first modules are arranged at intervals along a second direction. The battery pack includes: a second cold plate, the number of the second cold plates is plural, and the second cold plates are disposed on both side surfaces of the battery module in the second direction and between adjacent first modules.

11. The battery pack according to claim 1, characterized in that: include: A box body is provided with a receiving cavity, and the battery module is arranged in the receiving cavity.

12. A power device, characterized in that: Comprising a battery pack according to any one of claims 1-11.

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