A power battery pack

Abstract

This invention relates to a power battery pack, comprising a double-layered housing with a first composite phase variant sealed between the two layers, a control module and a signal acquisition module disposed within the housing, multiple battery cells with positive and negative electrodes at the same end, and a liquid cooling plate; the multiple battery cells are connected via a busbar to form a battery pack connected to the control module; both the busbar and the signal acquisition module are mounted on the liquid cooling plate; a first cooling element, internally sealed with a second composite phase variant, is disposed between the liquid cooling plate and the busbar, and the first cooling element has a thermally conductive insulating layer on its surface opposite to the busbar; a charging interface and connecting harness electrically connected to the control module are disposed on the housing; a second cooling element, internally sealed with a third composite phase variant and in contact with the surface of two adjacent battery cells, is disposed between them in a tubular structure. This invention can buffer instantaneous heat, maintain stable cooling, and facilitate maintenance.

Description

Technical Field

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

[0002] Power battery packs are now widely used in electric motorcycles, electric vehicles, and other fields. During charging and operation, the battery cells generate heat when discharging. Excessive cell temperature reduces battery performance and can even lead to thermal runaway. Current technologies either seal and fill the cells with phase change material for cooling, but this structure requires the destructive removal of all phase change material surrounding the cells in case of a malfunction, making repair difficult; or, in existing technologies, the mounting structure of the busbar connecting the battery cells on a liquid cooling plate is susceptible to heat spikes due to the short-term surges in current generated by the cells and motor controller during rapid acceleration and steep inclines in electric motorcycles or electric vehicles. This high-temperature heat flow directly impacts the liquid cooling plate, causing a rapid increase in temperature at localized areas. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a power battery pack.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a power battery pack, comprising a double-layered housing with a first composite phase change material sealed and filled between the two layers, a control module disposed within the housing, a signal acquisition module, multiple battery cells with positive and negative electrodes disposed at the same end, and a liquid cooling plate; the control module is communicatively connected to the signal acquisition module, and the signal acquisition module is electrically connected to the positive or negative electrode of each battery cell respectively; the multiple battery cells are connected by a busbar to form a battery pack connected to the control module; both the busbar and the signal acquisition module are disposed on the liquid cooling plate; a first cooling element with a second composite phase change material internally sealed and filled between the liquid cooling plate and the busbar is disposed, and the first cooling element has a thermally conductive insulating layer on its surface opposite to the busbar; the housing is provided with a charging interface and a connecting harness electrically connected to the control module, and the housing is also provided with an inlet and an outlet connected to the liquid cooling channel of the liquid cooling plate; a second cooling element with a tubular structure internally sealed and filled with a third composite phase change material is disposed between two adjacent battery cells and in contact with the surface of the battery cells.

[0005] Preferably, the busbar and the battery cell are arranged on opposite sides of the liquid cooling plate, and the liquid cooling plate has non-connected liquid cooling plate through holes at positions corresponding to the positive and negative electrodes of the battery cell. The first cooling element is a cooling ring embedded in the liquid cooling plate through hole.

[0006] Preferably, the positive and negative electrodes of the battery cell are set at different heights, and the busbar includes a horizontal part and a bent part that is bent at one end of the horizontal part, can pass through the liquid cooling plate through hole, and forms a stepped structure with the horizontal part.

[0007] Preferably, the battery cell is a cylindrical battery, the second cooling element is a second cooling element composed of an inner tube and an outer tube, the third composite phase change is sealed and filled between the inner tube and the outer tube, and the surface of the outer tube opposite to the battery cell is a concave arc surface.

[0008] Preferably, the second cooling component is a cooling pipe with a cavity inside the pipe wall, and the third composite phase change is sealed and filled in the cavity. Multiple cooling pipes are connected to each other through a connecting pipe in the box to form a cooling channel. The two ends of the cooling channel are respectively connected to the liquid cooling pipe of the liquid cooling plate.

[0009] Preferably, the control module includes a BMS system, a BDU electrically connected to the BMS system, a signal acquisition module communicatively connected to the BMS system, a battery pack electrically connected to the BDU, and a charging interface and a connecting harness electrically connected to the BDU.

[0010] Preferably, the housing is provided with a cylindrical connecting post for connecting the connecting wire harness, which is electrically connected to the control module; the inner wall of the connecting post has a fan-shaped annular connecting post protrusion with the same axis as the connecting post, and the axial section of the connecting post protrusion is an inclined plane from the top to the bottom and has a rounded corner at the top.

[0011] Preferably, the connecting harness includes a cable, one end of which is connected to an external connector for connecting to an external device, and the other end is connected to a battery connector. The battery connector includes a housing that is detachably connected to the enclosure, a crimp-type terminal block disposed within the housing and connected to the cable, and an electrode post passing through the housing. The electrode post is perpendicularly connected to the crimp-type terminal block at its tail end. The front end face of the electrode post is provided with a front blind hole with a tapered bottom surface, and the front end face of the electrode post extends forward at its edge with a fan-shaped ring post that matches and locks with the protrusion of the connecting post.

[0012] Preferably, the box is provided with a handle.

[0013] Preferably, the housing contains silicone heat-conducting components at both ends of each battery cell, and the silicone heat-conducting components have battery mounting holes for mounting the battery cells.

[0014] The beneficial effects of this invention are as follows: the second cooling element between the battery cells facilitates maintenance, and the second cooling element serves both as a support and as an absorber of the heat generated by the battery cells; the first cooling element between the liquid cooling plate and the busbar can absorb the heat generated instantaneously when a large current is generated, which greatly suppresses the instantaneous rise rate and amplitude of the busbar temperature, eliminates temperature peaks, and makes the temperature change of the busbar and the liquid cooling plate more gradual, avoiding the direct impact of high-temperature heat flow on the liquid cooling plate; at the same time, the phase change cooling structure of the housing further improves the cooling effect on the battery pack. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure inside the box according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-section of an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection structure of the liquid cooling plate, busbar and the first cooling component in an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the connecting column according to an embodiment of the present invention; Figure 6 This is a radial cross-sectional schematic diagram of the second cooling component according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the busbar structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a single battery cell according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the connecting wire harness according to an embodiment of the present invention; Component names and serial numbers in the diagram: 1-Box body, 10-Charging interface, 11-Connecting harness, 110-Cable, 111-External connector, 112-Shell, 113-Crimp-type terminal block, 114-Electrode post, 115-Front blind hole, 116-Fan ring post, 12-Liquid inlet, 13-Liquid outlet, 14-Connecting post, 140-Connecting post protrusion, 15-Handle, 16-Silicone thermal conductive component, 160-Battery mounting hole, 17-Separator, 2-Control module, 20-BMS system, 21-BDU, 3-Signal acquisition module, 4-Battery cell, 40-Negative electrode, 41-Positive electrode, 5-Liquid cooling plate, 6-Busbar, 60-Horizontal part, 61-Bending part, 62-Busbar through hole, 7-First cooling component, 8-Second cooling component, 80-Outer tube, 81-Inner tube, 82-Concave arc surface. Detailed Implementation

[0016] To more clearly illustrate the objectives, technical solutions, and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It is clear and complete that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0017] Examples of embodiments of the present invention Figures 1 to 9As shown, a power battery pack includes a double-layered housing 1 with a first composite phase change material sealed between the two layers, a control module 2, a signal acquisition module 3, multiple battery cells 4 with positive and negative electrodes 41 and 40 located at the same end, and a liquid cooling plate 5. The housing 1 is a double-layered sealed housing composed of an inner and outer housing, with the first composite phase change material, which can be a copper foam-paraffin composite phase change material, is sealed between the inner and outer housings. To facilitate the loading and unloading of the battery pack, a handle 15 is provided on the housing 1. The handle 15, charging interface 10, and connecting harness 11 are all located on the top of the housing 1. To prevent the housing 1 from being subjected to impact forces after a collision and to protect it from damage during vehicle operation... To mitigate the impact of bumps during the process on the battery cell 4, silicone heat-conducting components 16 are provided at both ends of the battery cell 4 inside the housing 1. The silicone heat-conducting components 16 are provided with battery mounting holes 160 for mounting the battery cell. On the one hand, the silicone heat-conducting components 16 are used to buffer the impact force on the battery cell 4 to ensure the stability of the battery cell 4 inside the housing 1. On the other hand, they also play a role in heat dissipation. At this time, the battery mounting holes 160 on the silicone heat-conducting components 16 on one side of the liquid cooling plate 5 are set as through holes, while the battery mounting holes 160 on the silicone heat-conducting components 16 on the other side are set as blind holes or through holes. At the same time, the silicone heat-conducting components 16 are provided with cooling component mounting through holes through which the second cooling component 8 passes at the position corresponding to the second cooling component 8 to facilitate the installation of the second cooling component 8. For example, a mounting bracket can be provided between the inner wall of the housing 1 and the silicone heat-conducting component 16, or a connecting protrusion can be provided on the inner wall of the housing 1 to connect the second heat-conducting component 8. When a mounting bracket is provided, a slot can be provided on the surface of the silicone heat-conducting component 16 opposite to the inner wall of the housing 1 to engage the mounting bracket. At the same time, a bolt is provided on the mounting bracket at the position corresponding to the second heat-conducting component 8. The end of the second heat-conducting component 8 is provided with an internal thread, and the bolt passes through the cooling component mounting hole and is threadedly connected to the second heat-conducting component 8. When a connecting protrusion is provided, an external thread is provided on the connecting protrusion, and then the connecting protrusion passes through the cooling component mounting hole and is threadedly connected to the second heat-conducting component 8. On the side of the liquid cooling plate 5, a mounting bracket is not required. The second heat-conducting component 8 and the liquid cooling plate 5 are directly connected by screws passing through the liquid cooling plate 5 and the cooling component mounting hole on the silicone heat-conducting component 16 on that side. The control module 2 is used to process the status signal of the battery cell 4 and generate corresponding control commands. The electrical connection between the battery pack and the external load is connected or disconnected through these commands. Signal acquisition module 3 is used to acquire voltage and temperature signals from multiple battery cells 4 and transmit them to control module 2; that is, control module 2 and signal acquisition module 3 are communicatively connected, and signal acquisition module 3 is electrically connected to the positive terminal 41 or negative terminal 40 of each battery cell 4. Multiple battery cells 4 are connected through busbar 6 to form a battery pack connected to control module 2, such as... Figure 1 and Figure 3As shown, multiple battery cells 4 are horizontally arranged, with their positive terminals 41 and negative terminals 40 facing backward. A liquid cooling plate 5 is vertically positioned behind the battery cells 4. Multiple busbars 6 are also provided, mounted on the liquid cooling plate 5 and connected to the battery cells 4. The busbars 6 connect the multiple battery cells 4 in a serpentine arrangement to form a battery pack. The first and last ends of the battery pack constitute its total positive and negative terminals, respectively. The pack is then connected to the control module 2 via corresponding busbars 6. Both the busbars 6 and the signal acquisition module 3 are mounted on the liquid cooling plate 5. The upper end; for the liquid cooling plate 5, any existing liquid cooling plate can be used; the control module 2 is set above the battery pack inside the housing 1, and a partition 17 is set on the top of the battery pack, and the control module 2 is set on the top surface of the partition 17; at this time, the housing 1 is correspondingly provided with an inlet 12 and an outlet 13 that are connected to the liquid cooling channel of the liquid cooling plate 5. The inlet 12 and the outlet 13 are used to connect to the external equipment that supplies the cooling liquid. Self-sealing quick connectors for connecting external equipment are correspondingly set on the inlet 12 and the outlet 13 to facilitate the connection with external equipment. A first cooling element 7, internally sealed and filled with a second composite phase change material, is provided between the liquid cooling plate 5 and the busbar 6. The first cooling element 7 has a thermally conductive insulating layer (not shown in the figure) on the surface opposite to the busbar 6. That is, the first cooling element 7 is provided on the surface of the liquid cooling plate 5 corresponding to the connection position between the busbar 6 and the battery cell 4. The phase change cooling of the first cooling element 7 is used to absorb the heat generated under instantaneous high current, which greatly suppresses the instantaneous rise rate and amplitude of the busbar 6 temperature, eliminates temperature peaks, and makes the temperature change of the busbar 6 and the liquid cooling plate 5 more gradual, avoiding the direct impact of high temperature heat flow on the liquid cooling plate 5. The first cooling element 7 is a metal component with an internal cavity, which is internally sealed and filled with a second composite phase change material. The second composite phase change material can be the same composite phase change material as the first composite phase change material. The thermally conductive insulating layer can be an aluminum nitride ceramic sheet attached to the surface of the first cooling element 7, or an aluminum nitride coating sprayed by vacuum plasma spraying.The surface of the first cooling element 7 opposite to the liquid cooling plate 5 is not provided with a thermally conductive insulating layer to avoid forming thermal resistance between the first cooling element 7 and the liquid cooling plate 5, which would reduce the heat conduction efficiency. The housing 1 is provided with a charging interface 10 and a connecting harness 11 that are electrically connected to the control module 2. The charging interface 10 is used to connect the charging equipment to charge the battery pack, while the connecting harness 11 is used to connect the electrical equipment to provide power to the electrical equipment. Between two adjacent battery cells 4, there is a second cooling element 8 with a tubular structure that is in contact with the surface of the battery cell 4 and is internally sealed and filled with a third composite phase change material. That is to say, the second cooling element 8 is also a component that can perform phase change cooling. The third composite phase change material that is internally sealed and filled with it also uses the same phase change material as the first composite phase change material. The second cooling element 8 is also horizontally arranged, with its two ends correspondingly connected to the liquid cooling plate 5 and the inner wall of the housing 1 opposite to the liquid cooling plate 5. Preferably, it is detachably connected. On the one hand, it provides support for the interior of the housing 1, and on the other hand, it supports the horizontally arranged battery cells 4. While supporting the battery cells 4, it can also absorb the heat generated by the battery cells 4 by utilizing the phase change cooling function.

[0018] Further improvements, such as Figure 4 As shown, the busbar 6 and the battery cell 4 are positioned on opposite sides of the liquid cooling plate 5. The liquid cooling plate 5 has non-connected through holes corresponding to the positions of the positive electrode 41 and negative electrode 40 of the battery cell 4. The first cooling element 7 is a cooling ring embedded within these through holes. In other words, the battery cell 4 is positioned in front of the liquid cooling plate 5, and the busbar 6 is positioned behind it. The positive electrode 41 and negative electrode 40 of the battery cell 4 are connected to the busbar 6 through the through holes. The first cooling element 7 is embedded within these through holes. For example, a groove can be provided around the cooling ring to engage the wall of the through hole. The thermally conductive insulating layer is then positioned on the inner ring wall of the cooling ring. To facilitate the connection between the battery cell 4 and the busbar 6, as shown... Figure 8 As shown, the positive electrode 41 and negative electrode 40 of the battery cell 4 are set at different heights. For example, the negative electrode 40 of the battery cell 4 can be set as a convex cylinder, while the positive electrode 41 can be set as a concave recess. Figure 7As shown, the busbar 6 includes a horizontal portion 60 and a bent portion 61 that bends at one end of the horizontal portion 60 and can pass through the liquid cooling plate through hole, forming a stepped structure with the horizontal portion 60. At this time, the bent portion 61 of the busbar 6 passes through the corresponding liquid cooling plate through hole and connects to the recessed portion of the battery cell A, while the protruding cylinder of the battery cell B passes through the opposite liquid cooling plate through hole and connects to the horizontal portion 60 of the busbar 6, ensuring the stability of the connection structure between the busbar 6 and the battery cell 4. At this time, a busbar through hole 62 is provided on the horizontal part 60 or the bending part 61 of the busbar 6. The acquisition end of the signal acquisition module 3 passes through the busbar through hole 62. In this way, the end of the busbar 6 where the bending part 61 is located is the positive terminal of the battery cell A, and the end where the horizontal part 60 is located is the negative terminal of the battery cell B. When the busbar through hole 62 is set in the horizontal part, the signal acquisition module 3 samples close to the positive terminal of the battery cell A, and the measurement is the positive terminal potential of the battery cell A. Similarly, when the busbar through hole 62 is set in the bending part 61, the signal acquisition module samples close to the negative terminal of the battery cell B, and the measurement is the negative terminal potential of the battery cell B.

[0019] Further improvements, such as Figure 1 , Figure 3 , Figure 6 and Figure 8 As shown, the battery cell 4 is a cylindrical battery. The second cooling element 8 is composed of an inner tube 81 and an outer tube 80. The third composite phase change is sealed and filled between the inner tube 81 and the outer tube 80. The inner tube 81 and the outer tube 80 are sealed at both ends by welded cover plates. The surface of the outer tube 80 opposite to the battery cell 4 is a concave arc surface 82, which creates a space between the battery cells 4. The second cooling element 8 is installed in this space. The concave arc surface 82 of the second cooling element 8 fits against the outer surface of the battery cell 4, effectively utilizing the space while cooling. At the same time, the second cooling element 8 has a buffer space when it expands due to the volume change of the third composite phase change inside it. Internal threads are provided at both ends of the second cooling element 8, and the second cooling element 8 can be detached and installed in the box by screws for easy maintenance.

[0020] Further improvements, such as Figure 3 and Figure 6As shown, the second cooling element 8 is a cooling pipe with a cavity inside its wall. The third composite phase variant is sealed and filled in the cavity. For example, the second cooling element 8 may adopt a double-layer structure consisting of an inner tube 81 and an outer tube 80. The difference is that multiple cooling pipes are connected by a connecting pipe (not shown in the figure) inside the housing 1 to form a cooling channel. Both ends of the cooling channel are connected to the liquid cooling pipes of the liquid cooling plate 5. In other words, the cross-section of the second cooling element 8 is a double-ring structure, and the third composite phase variant is sealed and filled between the two layers. The hollow portion of the inner ring of each second cooling element 8 constitutes part of the cooling channel. In this configuration, mounting brackets and silicone heat-conducting components 16 are installed at both ends of the second cooling element 8. Heat-conducting component slots are provided on the opposing surfaces of the silicone heat-conducting components 16 on both sides. The mounting brackets are then snapped into these slots. The mounting brackets are equipped with structures for limiting the connecting pipe, such as clamps or mounting bracket slots. The connecting pipe is then positioned within the clamps or mounting bracket slots of the mounting bracket inside the housing 1. The mounting brackets are then connected to the inner wall of the housing 1 and the liquid cooling plate 5 via threaded connections. This allows the coolant from the liquid cooling plate to flow through the second cooling element 8, carrying away the heat absorbed by the third composite phase change in the second cooling element 8 and improving heat dissipation efficiency. In this case, multiple second cooling elements 8 are connected by laser welding to form a cooling channel. The two ends of the cooling channel are connected to the liquid cooling channel of the liquid cooling plate 5 using quick-connect liquid cooling connectors.

[0021] Further improvements, such as Figure 1 As shown, the control module 2 includes a BMS system 20, a BDU 21 electrically connected to the BMS system 20, a signal acquisition module 3 communicatively connected to the BMS system 20, a battery pack electrically connected to the BDU 21, and a charging interface 10 and a connecting harness 11 electrically connected to the BDU 21. The BMS system 20 is a battery management system in the prior art that includes master control, slave control, and high-voltage control, through which it monitors the battery status and charging / discharging of the battery pack; the BDU is the battery pack circuit breaker unit in the prior art.

[0022] Further improvements, such as Figure 1 and Figure 5As shown, the housing 1 contains a cylindrical connecting post 14 for connecting the connecting wire harness 11, which is electrically connected to the control module 2. The inner wall of the connecting post 14 has a fan-shaped connecting post protrusion 140 with a radial cross-section coaxial with the connecting post 14. The axial cross-section of the connecting post protrusion 140 is an inclined plane from top to bottom, with a rounded corner at the top. That is, the inner and outer radii of the connecting post protrusion 140 gradually increase from top to bottom. The connecting post 14 is vertically mounted on the top surface of the partition 17 inside the housing 1 and electrically connected to the BDU21 of the control module 2. A corresponding mounting through-hole for installing the connecting wire harness 11 is provided on the housing 1. The end of the connecting wire harness 11 connected to the connecting post 11 is inserted through the mounting through-hole and connected to the connecting post 14. The connecting post protrusion 140 effectively prevents the rotation of the connecting wire harness 11. Figure 9As shown, the connecting harness 11 includes a cable 110. One end of the cable 110 is connected to an external connector 111 for connecting external devices, and the other end is connected to a battery connector. The battery connector is used to connect to the connecting post 14. The cable 110 uses a high-voltage power cable for battery packs in the prior art. The external connector 111 is used to connect the external components to be connected to the battery pack, such as an inverter. For example, the external connector 111 uses a three-phase power socket. The battery connector includes a housing 112 that is detachably connected to the enclosure 1, a crimped terminal block 113 disposed inside the housing 112 and connected to the cable 110, and an electrode post 114 passing through the housing 112. The housing 112 is detachably connected to the enclosure 1 by screws. The crimped terminal block 113... The connector is connected to the cable 110, which is threaded through the housing 112. The electrode post 114 is perpendicularly connected to the crimp terminal 113 at its tail end, which facilitates the installation of the wiring harness 11 on the battery pack and also prevents the connection between the electrode post 114 and the connecting post 14 from loosening due to the force generated by the bending of the cable 110. The electrode post 114 is a copper post, including a positive electrode post and a negative electrode post. Correspondingly, there are positive crimp terminals for connecting the positive electrode post and negative crimp terminals for connecting the negative electrode post. The cable 110 has a positive wire and a negative wire. The front end face of the electrode post 114 is provided with a front blind hole 115 with a tapered bottom surface. The front end face of the electrode post 114 extends forward at the edge with a fan-shaped ring post 116 that matches and locks with the connecting post protrusion 140. The front blind hole 115 is located at the center of the front end face of the electrode post 114. The outer diameter of the fan-shaped ring post 116 is the same as the outer diameter of the electrode post 114, and the inner diameter of the fan-shaped ring post 116 is the same as the diameter of the front blind hole 115. The fan-shaped ring post 116 extends forward along the axis of the front blind hole 115. The axial section of the fan-shaped ring post 116 is an inclined plane that slopes outward in the axial direction, and the axial section of the fan-shaped ring post 116 is rounded at the connection with the front end face of the electrode post 114. The cross section, which is the side plane of the fan ring column 116 in the axial direction, is inclined outward from the front end face of the electrode column 114 away from the axis. At the same time, the connection between the cross section of the fan ring column 116 and the front end face of the electrode column 114 is rounded. In this way, after the electrode column 114 is matched and inserted into the connecting column 14, the cross section of the fan ring column 116 and the cross section of the connecting column protrusion 140 are tightly matched to bear the torque, forming an interlocking structure to prevent the electrode column 114 from rotating.The inclined structure of the axial section of the fan ring column 116 changes the separation path from parallel movement in the prior art to ramp sliding when it detaches from the connection of the connecting column 14. This rapidly increases the air gap between the electrodes, causing a sharp drop in the electric field strength within the gap, thus lengthening the arc and making it extinguished due to insufficient voltage to sustain the arc. The structure of the fan ring column 116 also changes the electric field distribution between the electrodes. When an arc is generated, it can be guided to the front blind hole 115 through the axial section. The inner wall of the front blind hole 115 can be covered with an arc-resistant material, and the arc energy is confined within the front blind hole 115 for absorption and cooling. The arc energy and duration are significantly reduced. The rounded corner structure at the connection between the axial section of the fan ring column 116 and the front end face of the electrode column 114 can guide the arc from the axial section of the fan ring column 116 to the front blind hole 115, further improving safety.

[0023] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A power battery pack, characterized in that, The device comprises a double-layered housing with a first composite phase variant sealed between the two layers, a control module and a signal acquisition module disposed within the housing, multiple battery cells with positive and negative electrodes at the same end, and a liquid cooling plate. The control module is communicatively connected to the signal acquisition module, which is electrically connected to either the positive or negative electrode of each battery cell. The multiple battery cells are connected via a busbar to form a battery pack connected to the control module. Both the busbar and the signal acquisition module are mounted on the liquid cooling plate. A first cooling element, internally sealed and filled with a second composite phase variant, is disposed between the liquid cooling plate and the busbar. The first cooling element has a thermally conductive insulating layer on its surface opposite to the busbar. The housing has a charging interface and a connecting harness electrically connected to the control module. The housing also has an inlet and an outlet connected to the liquid cooling channel of the liquid cooling plate. A second cooling element, internally sealed and filled with a third composite phase variant, is disposed between adjacent battery cells in a tubular structure that contacts the surface of the battery cells.

2. The power battery pack according to claim 1, characterized in that, The busbar and the battery cell are arranged on opposite sides of the liquid cooling plate. The liquid cooling plate has non-connected liquid cooling plate through holes at positions corresponding to the positive and negative electrodes of the battery cell. The first cooling element is a cooling ring embedded in the liquid cooling plate through hole.

3. The power battery pack according to claim 2, characterized in that, The positive and negative electrodes of the battery cell are set at different heights. The busbar includes a horizontal part and a bent part that is bent at one end of the horizontal part, which can pass through the liquid cooling plate through hole and forms a stepped structure with the horizontal part.

4. The power battery pack according to claim 1, characterized in that, The battery cell is a cylindrical battery, the second cooling element is a second cooling element composed of an inner tube and an outer tube, the third composite phase change is sealed and filled between the inner and outer layers, and the surface of the outer tube opposite to the battery cell is a concave arc surface.

5. The power battery pack according to claim 1, characterized in that, The second cooling component is a cooling pipe with a cavity inside the pipe wall. The third composite phase change is sealed and filled in the cavity. Multiple cooling pipes are connected to each other through a connecting pipe in the box to form a cooling channel. The two ends of the cooling channel are respectively connected to the liquid cooling pipe of the liquid cooling plate.

6. The power battery pack according to claim 1, characterized in that, The control module includes a BMS system, a BDU electrically connected to the BMS system, a signal acquisition module communicatively connected to the BMS system, a battery pack electrically connected to the BDU, and a charging interface and a connecting harness electrically connected to the BDU.

7. The power battery pack according to claim 1, characterized in that, The housing is equipped with a cylindrical connecting post for connecting the connecting wire harness, which is electrically connected to the control module; the inner wall of the connecting post has a fan-shaped annular connecting post protrusion with the same axis as the connecting post, and the axial section of the connecting post protrusion is an inclined plane from the top to the bottom and has a rounded corner at the top.

8. The power battery pack according to claim 7, characterized in that, The connecting harness includes a cable, one end of which is connected to an external connector for connecting to an external device, and the other end is connected to a battery connector. The battery connector includes a housing that is detachably connected to the enclosure, a crimp terminal block disposed inside the housing and connected to the cable, and an electrode post passing through the housing. The electrode post is perpendicularly connected to the crimp terminal block at its tail end. The front end face of the electrode post is provided with a front blind hole with a tapered bottom surface, and the front end face of the electrode post extends forward at its edge with a fan-shaped ring post that matches and locks with the protrusion of the connecting post.

9. The power battery pack according to claim 1, characterized in that, The box is equipped with a handle.

10. The power battery pack according to claim 1, characterized in that, The housing contains silicone heat-conducting components at both ends of each battery cell, and the silicone heat-conducting components have battery mounting holes for mounting the battery cells.

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