Battery pack and electric vehicle adopting same

Abstract

The utility model relates to the technical field of vehicles, in particular to a battery pack and an electric vehicle adopting the battery pack. The battery pack comprises a liquid cooling pipe, a liquid inlet connector, a liquid outlet connector, a collector plate and a backflow piece. The liquid cooling pipe is arranged between the collector plate and the backflow piece and communicated with the collector plate and the backflow piece; the liquid inlet connector and the liquid outlet connector are both installed on the collector plate, a liquid inlet flow channel and a liquid outlet flow channel are arranged in the liquid cooling pipe, a pipe cavity of the liquid inlet connector is communicated with the liquid inlet flow channel, a pipe cavity of the liquid outlet connector is communicated with the liquid outlet flow channel, the backflow piece is provided with a backflow flow channel, and the backflow flow channel is communicated with the liquid inlet flow channel and the liquid outlet flow channel. The liquid inlet connector and the liquid outlet connector are both installed on the collector plate so that the liquid inlet connector and the liquid outlet connector can be located on the same side of the liquid cooling pipe, the liquid inlet connector and the liquid outlet connector can share the space of the side, away from the liquid cooling pipe, of the collector plate, the size of the battery pack is reduced, and the space utilization rate of the whole vehicle is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a battery pack and an electric vehicle adopting the battery pack. BACKGROUND

[0002] In order to meet the heat exchange requirement of the battery pack, the battery pack begins to adopt the mode of cooling the large surface of the battery cell, that is, a liquid cooling plate is arranged between the large surfaces of the battery cells in the battery pack to perform heat exchange. However, in the process of matching the liquid cooling assembly with a single battery cell in the related art, the liquid inlet and the liquid outlet of the liquid cooling assembly are arranged on the two sides of the liquid cooling assembly, thereby occupying the space of the battery pack and increasing the volume of the battery pack, which causes the waste of the space of the vehicle. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a battery pack and an electric vehicle adopting the battery pack, which has a smaller space occupation.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, which comprises a liquid cooling pipe, a liquid inlet connector, a liquid outlet connector, a current collecting plate and a backflow member. The liquid cooling pipe is arranged between the current collecting plate and the backflow member and communicates with both. The liquid inlet connector and the liquid outlet connector are both mounted on the current collecting plate. The liquid cooling pipe is provided with a liquid inlet flow channel and a liquid outlet flow channel. The lumen of the liquid inlet connector communicates with the liquid inlet flow channel, and the lumen of the liquid outlet connector communicates with the liquid outlet flow channel. The backflow member is provided with a backflow flow channel, and the backflow flow channel communicates with the liquid inlet flow channel and the liquid outlet flow channel.

[0005] The above-mentioned battery pack has the following advantages. The liquid cooling pipe is arranged between the current collecting plate and the backflow member and communicates with both. The lumen of the liquid inlet connector communicates with the liquid inlet flow channel in the liquid cooling pipe, and the lumen of the liquid outlet connector communicates with the liquid outlet flow channel in the liquid cooling pipe. The backflow flow channel in the backflow member communicates with the liquid inlet flow channel and the liquid outlet flow channel, thereby forming a circulating flow channel that can be used for heat dissipation. The liquid inlet connector and the liquid outlet connector are both mounted on the current collecting plate, so that the liquid inlet connector and the liquid outlet connector are located on the same side of the liquid cooling pipe. This is conducive to the liquid inlet connector and the liquid outlet connector sharing the space on the side of the current collecting plate away from the liquid cooling pipe, thereby reducing the volume of the battery pack and improving the space utilization of the vehicle.

[0006] Optionally, the liquid inlet flow channel is provided with a plurality of liquid inlet flow channels, and each liquid inlet flow channel communicates with the lumen of the liquid inlet connector and the backflow flow channel.

[0007] Optionally, the liquid outlet flow channel is provided with a plurality of liquid outlet flow channels, and each liquid outlet flow channel communicates with the lumen of the liquid outlet connector and the backflow flow channel.

[0008] Optionally, the current collecting plate is provided with a liquid inlet cavity and a liquid outlet cavity which are independent of each other. The lumen of the liquid inlet connector and the liquid inlet flow channel both communicate with the liquid inlet cavity, and the lumen of the liquid outlet connector and the liquid outlet flow channel both communicate with the liquid outlet cavity.

[0009] Optionally, the current collecting plate comprises a bottom plate and a cover plate, and the liquid inlet connector and the liquid outlet connector are both mounted on the cover plate; the bottom plate is arranged between the cover plate and the liquid cooling pipe, and a side of the bottom plate facing the cover plate is provided with a liquid inlet groove and a liquid outlet groove which are independent of each other; and the cover plate covers the liquid inlet groove and the liquid outlet groove, so that a liquid inlet cavity is formed in the liquid inlet groove and a liquid outlet cavity is formed in the liquid outlet groove.

[0010] Optionally, the wall of the liquid inlet groove away from the cover plate is provided with a liquid inlet opening, and the liquid inlet opening is communicated with the liquid inlet flow channel; and the wall of the liquid outlet groove away from the cover plate is provided with a liquid outlet opening, and the liquid outlet opening is communicated with the liquid outlet flow channel.

[0011] Optionally, a plurality of liquid inlet flow channels and a plurality of liquid outlet flow channels are arranged.

[0012] Optionally, the number of the liquid inlet flow channels is greater than the number of the liquid outlet flow channels.

[0013] Optionally, the liquid cooling pipe is arranged in a wave shape.

[0014] Optionally, a plurality of liquid cooling pipes are arranged, the plurality of liquid cooling pipes are arranged in parallel, the liquid inlet flow channel of each liquid cooling pipe is communicated with the lumen of the liquid inlet connector, the liquid outlet flow channel of each liquid cooling pipe is communicated with the lumen of the liquid outlet connector, and the side of each liquid cooling pipe away from the current collecting plate is provided with a backflow member.

[0015] Optionally, the battery pack further comprises a shell and a battery module, the battery module is arranged in the shell, the battery module comprises a plurality of battery cells, and the liquid cooling pipe is arranged between two adjacent battery cells.

[0016] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising a vehicle frame, a walking assembly, a power assembly and a vehicle body cover, the walking assembly is at least partially located below the vehicle frame, the power assembly is supported by the vehicle frame and is drivingly connected to the walking assembly, the vehicle body cover is at least partially covered on the vehicle frame, the power assembly comprises a motor and the above-mentioned battery pack, and the battery pack provides electric energy for the motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the battery pack after the shell and the battery cells are cut open in an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the overall structure of the liquid cooling assembly in an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of the local structure of the liquid cooling pipe in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the overall structure of the backflow member in an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of the overall structure of the busbar in one embodiment of the present application. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] One embodiment of the present application provides an electric vehicle, comprising a vehicle frame, a walking assembly, a power assembly and a vehicle body cover, the walking assembly being at least partially located below the vehicle frame, the power assembly being supported by the vehicle frame and being drivingly connected to the walking assembly, the vehicle body cover being at least partially covered on the vehicle frame, the power assembly comprising a motor and a battery pack, the battery pack providing power for the motor.

[0026] In some embodiments, the electric vehicle is an electric two-wheeled vehicle.

[0027] In other embodiments, the electric vehicle is an electric four-wheeled vehicle.

[0028] In other embodiments, the electric vehicle is an electric all-terrain vehicle.

[0029] Referring to Figure 1 In some embodiments, the battery pack 100 comprises a housing 11, a battery module 12 and a liquid cooling assembly 13. The housing 11 has a receiving cavity 111, and the battery module 12 is arranged in the housing 11.

[0030] The battery module 12 comprises a plurality of battery cells 121, and the liquid cooling assembly 13 comprises a liquid cooling pipe 131. The liquid cooling pipe 131 is arranged between two adjacent battery cells 121, which is conducive to dissipating heat of the battery cells 121 and improving the operation stability and safety of the battery pack 100.

[0031] Referring to Figure 1 and Figure 2 In some embodiments, the liquid cooling assembly 13 comprises the liquid cooling pipe 131, a liquid inlet connector 132, a liquid outlet connector 133, a current collecting plate 134 and a backflow member 135. The liquid inlet connector 132 and the liquid outlet connector 133 are both mounted on the current collecting plate 134. The liquid cooling pipe 131 is arranged between the current collecting plate 134 and the backflow member 135. One end of the liquid cooling pipe 131 is in communication with the current collecting plate 134, and the other end of the liquid cooling pipe 131 is in communication with the backflow member 135. The above-mentioned communication means that the liquid cooling pipe 131, the current collecting plate 134 and the backflow member 135 are all provided with flow channels, and the flow channels in the liquid cooling pipe 131, the current collecting plate 134 and the backflow member 135 are in communication.

[0032] Referring to Figure 2 , Figure 3 and Figure 4 Specifically, the liquid cooling pipe 131 is provided with a liquid inlet flow channel 1311 and a liquid outlet flow channel 1312. The liquid inlet connector 132 and the liquid outlet connector 133 both have a lumen. The lumen of the liquid inlet connector 132 is in communication with the liquid inlet flow channel 1311, and the lumen of the liquid outlet connector 133 is in communication with the liquid outlet flow channel 1312. The backflow member 135 is provided with a backflow flow channel 1351, and the backflow flow channel 1351 is in communication with the liquid inlet flow channel 1311 and the liquid outlet flow channel 1312, thereby forming a circulating flow channel that can be used for heat dissipation. The circulating flow channel flows through a cooling medium, and the liquid cooling pipe 131 is in contact with the battery cell 121, so that the heat generated by the battery cell 121 is absorbed by the cooling medium in the liquid cooling pipe 131, thereby improving the operation stability and safety of the battery pack 100.

[0033] It should be noted that Figure 2 In some embodiments, the dashed line represents the path of the cooling medium flowing into the liquid cooling assembly 13, and the single-dotted line represents the path of the cooling medium flowing out of the liquid cooling assembly 13.

[0034] The liquid inlet connector 132 and the liquid outlet connector 133 are both mounted on the current collecting plate 134, so that the liquid inlet connector 132 and the liquid outlet connector 133 are located on the same side of the liquid cooling pipe 131, facilitating the liquid inlet connector 132 and the liquid outlet connector 133 to share the space on the side of the current collecting plate 134 away from the liquid cooling pipe 131, reducing the space occupation of the liquid cooling assembly 13 in the battery pack 100, reducing the volume of the battery pack 100, and improving the space utilization of the whole vehicle.

[0035] In some embodiments, the side surface of the backflow member 135 is provided with a backflow groove 1352, and the backflow flow channel 1351 is formed in the backflow groove 1352.

[0036] Please refer to Figure 3 and Figure 4 In some embodiments, the liquid inlet flow channel 1311 is provided with a plurality of liquid inlet flow channels, each of which is in communication with the lumen of the liquid inlet connector 132 and the backflow flow channel 1351.

[0037] In some other embodiments, the liquid outlet flow channel 1312 is provided with a plurality of liquid outlet flow channels, each of which is in communication with the lumen of the liquid outlet connector 133 and the backflow flow channel 1351.

[0038] In some embodiments, the number of liquid inlet flow channels 1311 is the same as that of liquid outlet flow channels 1312, and the total flow rate of the cooling medium in the liquid inlet flow channels 1311 is the same as that of the cooling medium in the liquid outlet flow channels 1312, so that the flow rate of the cooling medium in the liquid inlet flow channels 1311 is equal to that of the cooling medium in the liquid outlet flow channels 1312, the circulation of the cooling medium is smooth, and the operation stability of the liquid cooling assembly 13 is improved.

[0039] In some other embodiments, the number of liquid inlet flow channels 1311 is greater than that of liquid outlet flow channels 1312. Since each of the liquid inlet flow channels 1311 is in communication with the lumen of the liquid inlet connector 132 and the backflow flow channel 1351, and each of the liquid outlet flow channels 1312 is in communication with the lumen of the liquid outlet connector 133 and the backflow flow channel 1351, the backflow flow channel 1351 is in communication with the liquid inlet flow channels 1311 and the liquid outlet flow channels 1312, and the total amount of the cooling medium entering the liquid inlet connector 132 is equal to the total amount of the cooling medium flowing out of the liquid outlet connector 133. Therefore, the total flow rate of the cooling medium in the liquid inlet flow channels 1311 is the same as that of the cooling medium in the liquid outlet flow channels 1312. However, the number of liquid inlet flow channels 1311 is greater than that of liquid outlet flow channels 1312, resulting in that the flow rate of the cooling medium in the liquid inlet flow channels 1311 is less than that of the cooling medium in the liquid outlet flow channels 1312, which is conducive to improving the heat absorption time of the cooling medium in the liquid inlet flow channels 1311 and improving the heat absorption efficiency. At the same time, the outflow speed of the cooling medium in the liquid outlet flow channels 1312 is improved, thereby reducing the influence of the cooling medium in the liquid outlet flow channels 1312 after heat absorption on the battery cell 121.

[0040] Please refer to Figure 2 andFigure 5 In some embodiments, the manifold 134 is provided with independent inlet liquid cavity 1341a and outlet liquid cavity 1341b, the lumen of the inlet connector 132 and the inlet flow channel 1311 are both communicated with the inlet liquid cavity 1341a, and the lumen of the outlet connector 133 and the outlet flow channel 1312 are both communicated with the outlet liquid cavity 1341b.

[0041] In some embodiments, the manifold 134 comprises a bottom plate 1341 and a cover plate 1342, and the inlet connector 132 and the outlet connector 133 are both mounted on the cover plate 1342.

[0042] The bottom plate 1341 is arranged between the cover plate 1342 and the liquid cooling pipe 131, and the side of the bottom plate 1341 facing the cover plate 1342 is provided with independent inlet liquid groove 1341c and outlet liquid groove 1341d, and the cover plate 1342 covers the inlet liquid groove 1341c and the outlet liquid groove 1341d, so that the inlet liquid cavity 1341a is formed in the inlet liquid groove 1341c, and the outlet liquid cavity 1341b is formed in the outlet liquid groove 1341d.

[0043] In some embodiments, the connection between the cover plate 1342 and the bottom plate 1341 is sealed.

[0044] In some embodiments, the bottom plate 1341 is provided with a sealing groove (not shown in the figure), and the sealing groove is arranged around the inlet liquid groove 1341c and the outlet liquid groove 1341d. A sealing ring (not shown in the figure) is arranged in the sealing groove, and the cover plate 1342 presses the sealing ring to fill and seal the gap between the cover plate 1342 and the bottom plate 1341.

[0045] In some embodiments, the wall of the inlet liquid groove 1341c away from the cover plate 1342 is provided with an inlet port 1341e, and the inlet port 1341e is communicated with the inlet flow channel 1311 at the same time. The wall of the outlet liquid groove 1341d away from the cover plate 1342 is provided with an outlet port 1341f, and the outlet port 1341f is communicated with the outlet flow channel 1312 at the same time, which is beneficial to integrate the inlets of all inlet flow channels 1311 at one place and connect the inlet connector 132, and integrate the outlets of all outlet flow channels 1312 at one place and connect the outlet connector 133.

[0046] In some embodiments, the liquid cooling pipe 131 is provided in multiple rows, and the multiple liquid cooling pipes 131 are arranged in intervals and side by side. The liquid inlet 1341e on the bottom plate 1341 is provided in multiple, and the liquid inlet 1341e corresponds to the liquid cooling pipe 131 one by one. The liquid inlet flow channel 1311 of each liquid cooling pipe 131 is communicated with the liquid inlet cavity 1341a through the corresponding liquid inlet 1341e, so as to communicate the lumen of the liquid inlet connector 132. The liquid outlet 1341f on the bottom plate 1341 is provided in multiple, and the liquid outlet 1341f corresponds to the liquid cooling pipe 131 one by one. The liquid outlet flow channel 1312 of each liquid cooling pipe 131 is communicated with the liquid outlet cavity 1341b through the corresponding liquid outlet 1341f, so as to communicate the lumen of the liquid outlet connector 133. The side of each liquid cooling pipe 131 away from the current collecting plate 134 is provided with a backflow member 135, so as to form multiple parallel circulating flow channels.

[0047] In some embodiments, the electric core 121 is composed of multiple cylindrical electric core units, and the liquid cooling pipe 131 is arranged in a wave shape, so as to fit the shape of the electric core unit, which is beneficial to improve the contact area with the electric core 121 and improve the heat dissipation efficiency.

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the plastic member used by the liquid cooling pipe 131 can be understood that the thinner plastic member has better elasticity, so that the liquid cooling pipe 131 has better elastic deformation performance. During the charging and discharging process of the battery pack 100, the electric core 121 will expand and shrink and recover. When the electric core 121 expands, the gap between the adjacent two electric cores 121 decreases, and the electric core 121 will extrude the liquid cooling pipe 131 to deform the liquid cooling pipe 131. When the electric core 121 shrinks and recovers, because the liquid cooling pipe 131 has good elastic deformation ability, the shape of the liquid cooling pipe 131 will rebound and recover to the state before being extruded, so that during the charging and discharging process of the battery pack 100, the liquid cooling pipe 131 will always be in contact with the largest area of the electric core 121, which is beneficial to ensure the heat exchange efficiency between the electric core 121 and the liquid cooling pipe 131, maintain the temperature stability of the electric core 121, and improve the stability and safety of the battery pack 100.

[0049] In some embodiments, the plastic material used by the liquid cooling pipe 131 has high temperature resistance, corrosion resistance, high pressure resistance, and also has insulation performance. By arranging the liquid cooling pipe 131 between two adjacent electric cores 121, the liquid cooling pipe 131 also plays an insulation role.

[0050] When the liquid cooling assembly 13 is in operation, the cooling medium with low temperature flows into the liquid inlet 132, and then flows into the inlet flow channel 1311 of each liquid cooling pipe 131 through the inlet cavity 1341a of the manifold 134, so as to form parallel cooling and improve the cooling efficiency. The liquid cooling pipe 131 is attached to the battery cell 121, and absorbs the heat generated by the battery cell 121 through the cooling medium. The cooling medium flows into the outlet flow channel 1312 through the return flow channel 1351 of the return flow piece 135, and then flows out from the outlet 133 after being collected in the outlet cavity 1341b of the manifold 134. The cooling medium flows into the manifold 134 through the liquid inlet 132 after being cooled, and then performs the next cycle.

[0051] In addition, for those skilled in the art, various corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications shall belong to the protection scope of the claims of the present application.

Claims

1. A battery pack, comprising: Liquid cooling pipes; Liquid inlet connector; Liquid outlet connector; The feature is that it further includes a manifold and a reflux component, the liquid cooling pipe is disposed between the manifold and the reflux component and communicates with both; the liquid inlet connector and the liquid outlet connector are both installed on the manifold, the liquid cooling pipe is provided with a liquid inlet channel and a liquid outlet channel, the lumen of the liquid inlet connector is connected to the liquid inlet channel, the lumen of the liquid outlet connector is connected to the liquid outlet channel, the reflux component is provided with a reflux channel, and the reflux channel is connected to the liquid inlet channel and the liquid outlet channel.

2. The battery pack as described in claim 1, characterized in that, The liquid inlet channel is provided with multiple channels, and each liquid inlet channel is connected to the lumen of the liquid inlet connector and the return channel; And / or, the liquid outlet channel is provided with multiple channels, each of which is connected to the lumen of the liquid outlet connector and the return channel.

3. The battery pack as described in claim 2, characterized in that, The manifold is provided with independent inlet and outlet chambers. The inlet connector and the inlet channel are both connected to the inlet chamber, and the outlet connector and the outlet channel are both connected to the outlet chamber.

4. The battery pack as described in claim 3, characterized in that, The manifold includes a base plate and a cover plate. The liquid inlet connector and the liquid outlet connector are both installed on the cover plate. The base plate is disposed between the cover plate and the liquid cooling pipe. The side of the base plate facing the cover plate has independent liquid inlet grooves and liquid outlet grooves. The cover plate covers the liquid inlet grooves and the liquid outlet grooves, so that the liquid inlet chamber is formed in the liquid inlet groove and the liquid outlet chamber is formed in the liquid outlet groove.

5. The battery pack as described in claim 4, characterized in that, The inlet tank has an inlet on the wall away from the cover plate, and the inlet is connected to the inlet channel. The outlet tank has an outlet on the wall away from the cover plate, and the outlet is connected to the outlet channel.

6. The battery pack as described in claim 1, characterized in that, Multiple liquid inlet channels and multiple liquid outlet channels are provided; The number of inlet channels is greater than or equal to the number of outlet channels.

7. The battery pack as claimed in claim 1, characterized in that, The liquid cooling pipe is arranged in a wavy shape.

8. The battery pack as claimed in claim 1, characterized in that, The liquid cooling pipes are arranged in multiples, spaced apart and side by side. The liquid inlet channel of each liquid cooling pipe is connected to the cavity of the liquid inlet connector, and the liquid outlet channel of each liquid cooling pipe is connected to the cavity of the liquid outlet connector. The return flow element is provided on the side of each liquid cooling pipe away from the manifold.

9. The battery pack as claimed in claim 1, characterized in that, The device includes a housing and a battery module, the battery module being disposed within the housing and comprising multiple battery cells, with the liquid cooling pipe disposed between two adjacent battery cells.

10. An electric vehicle, comprising: Frame; A running gear, at least partially located under the vehicle frame; A power assembly, which is supported by the frame and connected to the running gear; A body panel that at least partially covers the vehicle frame; The power assembly is characterized in that it includes a motor and a battery pack as described in any one of claims 1-9, wherein the battery pack provides electrical energy to the motor.

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