Liquid cooling device and battery pack

Abstract

The utility model provides a liquid cooling device and a battery pack. The liquid cooling device comprises a cooling plate and a liquid cooling pipe, the liquid cooling plate comprises a first liquid cooling plate and a second liquid cooling plate, the first liquid cooling plate is internally provided with a water outlet cavity, the second liquid cooling plate is internally provided with a water inlet cavity, the water inlet cavity is communicated with a communication port of a water inlet connector, the water outlet cavity is communicated with a communication port of a water outlet connector, and the liquid cooling pipe is internally provided with an isolation column. A water inlet channel, a water outlet channel and a circulation cavity are formed in the liquid cooling pipe, and the water inlet channel and the water outlet channel are arranged at an interval through an isolation column. When the liquid cooling device works, cooling liquid sequentially enters the water inlet cavity from the water inlet connector, then sequentially passes through the water inlet channel, the circulation cavity and the water outlet channel to reach the water outlet cavity and finally is led out from the water outlet connector, and in the whole process, the face, close to the liquid cooling pipe, of the second liquid cooling plate makes contact with the end face of a battery cell, and the peripheral wall of the liquid cooling pipe makes contact with the side face of the battery cell; therefore, the battery cell is cooled, and the heat of the battery cell is effectively dissipated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and in particular to a liquid cooling device and a battery pack. Background Art

[0002] In existing power battery cooling systems, liquid cooling pipes are widely used. Liquid cooling pipes carry away the heat generated by the battery through the flow of coolant to maintain the normal operating temperature of the battery.

[0003] At present, the most commonly used design is the serpentine liquid cooling tube, such as Figure 1 As shown, the curved pipe structure increases the contact area between the coolant and the side of the battery, so that the coolant can better absorb and dissipate the heat generated by the battery.

[0004] However, the degree of curvature of the serpentine liquid cooling pipe may affect the flow of the coolant and increase pressure loss. At the same time, the liquid cooling pipe requires precise internal channels and complex connection parts. The curved structure of the serpentine liquid cooling pipe greatly increases the manufacturing difficulty and manufacturing cost. In addition, the length of the liquid cooling pipe will increase with the increase in the number of module cells, resulting in a large difference in the liquid cooling effect between the cells near the water inlet end of the flow channel and the end cells, which ultimately affects the consistency and life of the battery.

[0005] In view of the above problems, there is an urgent need for a liquid cooling device that has a large contact area with the battery cell and effectively dissipates heat. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a liquid cooling device and a battery pack that have a large contact area with the battery cell and effectively dissipate heat.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A liquid cooling device, comprising a liquid cooling plate and a liquid cooling pipe, wherein the liquid cooling pipe is connected to the bottom of the liquid cooling plate, a water inlet joint and a water outlet joint are arranged on a side of the liquid cooling plate away from the bottom, the water inlet joint and the water outlet joint are arranged staggered, the outer peripheral wall of the liquid cooling pipe is used to abut against the side of the battery cell, and a side of the liquid cooling plate adjacent to the liquid cooling pipe is used to abut against the end face of the battery cell;

[0009] The liquid cooling plate comprises a first liquid cooling plate and a second liquid cooling plate, the liquid cooling tube is connected to one side of the second liquid cooling plate, the first liquid cooling plate is arranged on one side of the second liquid cooling plate away from the liquid cooling tube, a water outlet cavity is provided inside the first liquid cooling plate, a water inlet cavity is provided inside the second liquid cooling plate, the water inlet cavity is communicated with the connecting port of the water inlet joint, and the water outlet cavity is communicated with the connecting port of the water outlet joint;

[0010] An isolation column is provided inside the liquid cooling tube, and the isolation column is arranged axially along the liquid cooling tube. A water inlet channel, a water outlet channel and a circulation cavity are opened inside the liquid cooling tube. The water inlet channel is separated from the water outlet channel by the isolation column. The water inlet channel is located between the inner circumferential wall of the liquid cooling tube and the outer circumferential wall of the isolation column, the water outlet channel is located on the inner circumferential wall of the isolation column, and the circulation cavity is located below the water inlet channel and the water outlet channel. The water inlet channel is connected with the water outlet channel through the circulation cavity, the water inlet channel is also connected with the water inlet cavity, and the water outlet channel is also connected with the water outlet cavity.

[0011] In one embodiment, a water inlet column is provided inside the first liquid cooling plate, one end of the water inlet column is connected to the inner side of the second liquid cooling plate away from the liquid cooling tube, the other end of the water inlet column is connected to a side of the water inlet joint adjacent to the first liquid cooling plate, and the connecting port of the water inlet joint is connected to the water inlet cavity through the connecting port of the water inlet column.

[0012] In one embodiment, the isolation column is provided with a water outlet column in an extension direction away from the flow cavity, one end of the water outlet column is connected to the inner side of the first liquid cooling plate adjacent to the second liquid cooling plate, and the water outlet channel is connected to the water outlet cavity through a connecting port of the water outlet column.

[0013] In one of the embodiments, the liquid cooling tube is provided with a heat conducting sheet, the heat conducting sheet is sleeved on the outer peripheral side of the liquid cooling tube, and the heat conducting sheet is used to abut against the side surface of the battery core.

[0014] In one embodiment, the liquid cooling tube is an extrusion-molded structure.

[0015] A battery pack comprises a battery pack body and the liquid cooling device described in any of the above embodiments, wherein the battery pack body comprises a battery module and a protective cover, one side of the battery module is connected to the protective cover, and the side of the battery module facing away from the protective cover is connected to the liquid cooling device, and part of the structure of the liquid cooling device is located inside the battery module.

[0016] In one embodiment, the battery module is provided with a first fixing hole, and the protective cover is provided with a fixing groove, the first fixing hole and the fixing groove are arranged correspondingly, the liquid cooling pipe is successively passed through the first fixing hole and the fixing groove, and the end of the liquid cooling pipe away from the liquid cooling plate is located in the fixing groove and connected to the protective cover.

[0017] In one embodiment, the battery pack body further includes a thermally conductive pad and a thermally insulating pad. The thermally conductive pad is located between the second liquid cooling plate and the battery module, and the thermally insulating pad is located between the battery module and the protective cover.

[0018] In one embodiment, the thermal conductive pad is provided with a second fixing hole, the thermal insulating pad is provided with a third fixing hole, the second fixing hole is arranged corresponding to the third fixing hole through the first fixing hole, and the liquid cooling pipe is successively passed through the second fixing hole, the first fixing hole, the third fixing hole and the fixing groove.

[0019] In one embodiment, the battery pack body also includes a bus, which includes a first abutting portion, an electrical connecting portion and a second abutting portion that are connected to each other, the first abutting portion abuts against an inner side of the battery module, the second abutting portion abuts against a corresponding inner side of the battery module, one side of the electrical connecting portion abuts against a side of the thermal insulation pad facing away from the protective cover, and the electrical connecting portion is used to be electrically connected to the battery cell.

[0020] In one embodiment, the battery pack body also includes a first locking member and a second locking member, the liquid cooling plate is provided with a first through hole, the thermal conductive pad is provided with a second through hole, and the battery module is provided with a third through hole. The first through hole, the second through hole and the third through hole are arranged correspondingly, the first locking member is successively passed through the first through hole, the second through hole and the third through hole, and the top of the first locking member is located in the first through hole.

[0021] In one embodiment, the protective cover is provided with a fourth through hole, the thermal insulation pad is provided with a fifth through hole, the fourth through hole, the fifth through hole and the third through hole are arranged correspondingly, the second locking member is successively passed through the fourth through hole, the fifth through hole and the third through hole, and the top of the second locking member is located in the fourth through hole.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] In the above-mentioned liquid cooling device, a water outlet cavity is provided inside the first liquid cooling plate, a water inlet cavity is provided inside the second liquid cooling plate, and a water inlet channel, a flow cavity and a water outlet channel are provided in the liquid cooling tube which are sequentially connected. When the liquid cooling device is working, the cooling liquid enters the water inlet cavity from the water inlet joint, and then passes through the water inlet channel, the flow cavity and the water outlet channel in turn to reach the water outlet cavity, and is finally led out from the water outlet joint. During the whole process, one side of the second liquid cooling plate adjacent to the liquid cooling tube contacts the end face of the battery cell, and the outer peripheral wall of the liquid cooling tube contacts the side face of the battery cell to cool the battery cell and effectively dissipate the heat of the battery cell. Compared with the prior art, the contact area between the cooling liquid and the battery cell under this structure is increased, so that the contact area can enable the cooling liquid to further carry away the heat generated by the battery cell through the flow of liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of a serpentine liquid cooling tube in the prior art;

[0026] Figure 2 is a schematic structural diagram of a liquid cooling device according to an embodiment;

[0027] Figure 3 for Figure 2 A structural cross-sectional view of the liquid cooling device shown;

[0028] Figure 4 for Figure 2 Another structural schematic diagram of the liquid cooling device shown;

[0029] Figure 5 This is a schematic structural diagram of a liquid cooling tube according to an embodiment;

[0030] Figure 6 for Figure 5 Another structural schematic diagram of the liquid cooling tube shown;

[0031] Figure 7 is a schematic structural diagram of a battery pack according to an embodiment;

[0032] Figure 8 for Figure 7 The structural explosion diagram of the battery pack is shown. Description of the drawings:

[0034] 10. Liquid cooling device; 20. Battery pack; 100. Liquid cooling plate; 101. First through hole; 110. Water inlet joint; 120. Water outlet joint; 130. First liquid cooling plate; 131. Water outlet cavity; 140. Second liquid cooling plate; 141. Water inlet cavity; 142. Water inlet hole; 200. Liquid cooling pipe; 201. Air avoidance groove; 202. Pipe end cover; 210. Isolation column; 211. Water outlet column; 220. Water inlet channel; 230. Water outlet channel; 240. Circulation cavity; 250. Heat conducting sheet; 300 , battery pack body; 310, battery module; 311, first fixing hole; 312, third through hole; 320, protective cover; 321, fixing groove; 322, fourth through hole; 330, thermal conductive pad; 331, second fixing hole; 332, second through hole; 340, thermal insulation pad; 341, third fixing hole; 342, fifth through hole; 350, bus; 351, first abutting portion; 352, electrical connection portion; 353, second abutting portion; 360, first locking member; 370, second locking member. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] The present disclosure provides a liquid cooling device, comprising a liquid cooling plate and a liquid cooling pipe, wherein the liquid cooling pipe is connected to the bottom of the liquid cooling plate, a water inlet joint and a water outlet joint are arranged on a side of the liquid cooling plate away from the bottom, the water inlet joint and the water outlet joint are arranged staggered, the outer peripheral wall of the liquid cooling pipe is used to abut against the side surface of the battery cell, and a side of the liquid cooling plate adjacent to the liquid cooling pipe is used to abut against the end surface of the battery cell;

[0039] The liquid cooling plate comprises a first liquid cooling plate and a second liquid cooling plate, the liquid cooling tube is connected to one side of the second liquid cooling plate, the first liquid cooling plate is arranged on one side of the second liquid cooling plate away from the liquid cooling tube, a water outlet cavity is provided inside the first liquid cooling plate, a water inlet cavity is provided inside the second liquid cooling plate, the water inlet cavity is communicated with the connecting port of the water inlet joint, and the water outlet cavity is communicated with the connecting port of the water outlet joint;

[0040] An isolation column is provided inside the liquid cooling tube, and the isolation column is arranged axially along the liquid cooling tube. A water inlet channel, a water outlet channel and a circulation cavity are opened inside the liquid cooling tube. The water inlet channel is separated from the water outlet channel by the isolation column. The water inlet channel is located between the inner circumferential wall of the liquid cooling tube and the outer circumferential wall of the isolation column, the water outlet channel is located on the inner circumferential wall of the isolation column, and the circulation cavity is located below the water inlet channel and the water outlet channel. The water inlet channel is connected with the water outlet channel through the circulation cavity, the water inlet channel is also connected with the water inlet cavity, and the water outlet channel is also connected with the water outlet cavity.

[0041] In the above-mentioned liquid cooling device, a water outlet cavity is provided inside the first liquid cooling plate, a water inlet cavity is provided inside the second liquid cooling plate, and a water inlet channel, a flow cavity and a water outlet channel are provided in the liquid cooling tube which are sequentially connected. When the liquid cooling device is working, the cooling liquid enters the water inlet cavity from the water inlet joint, and then passes through the water inlet channel, the flow cavity and the water outlet channel in turn to reach the water outlet cavity, and is finally led out from the water outlet joint. During the whole process, one side of the second liquid cooling plate adjacent to the liquid cooling tube contacts the end face of the battery cell, and the outer peripheral wall of the liquid cooling tube contacts the side face of the battery cell to cool the battery cell and effectively dissipate the heat of the battery cell. Compared with the prior art, the contact area between the cooling liquid and the battery cell under this structure is increased, so that the contact area can enable the cooling liquid to further carry away the heat generated by the battery cell through the flow of liquid.

[0042] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0043] like Figures 2 to 6 As shown, the present disclosure provides a liquid cooling device 10, including a liquid cooling plate 100 and a liquid cooling tube 200, the liquid cooling tube 200 is connected to the bottom of the liquid cooling plate 100, and a water inlet joint 110 and a water outlet joint 120 are provided on the side of the liquid cooling plate 100 away from the bottom, the water inlet joint 110 and the water outlet joint 120 are staggered, the outer peripheral wall of the liquid cooling tube 200 is used to abut the side of the battery cell, and the side of the liquid cooling plate 100 adjacent to the liquid cooling tube 200 is used to abut the end face of the battery cell.

[0044] like Figure 2As shown, in one embodiment, the liquid cooling plate 100 includes a first liquid cooling plate 130 and a second liquid cooling plate 140, the liquid cooling tube 200 is connected to one side of the second liquid cooling plate 140, the first liquid cooling plate 130 is arranged on the side of the second liquid cooling plate 140 away from the liquid cooling tube 200, a water outlet cavity 131 is opened inside the first liquid cooling plate 130, and a water inlet cavity 141 is opened inside the second liquid cooling plate 140, the water inlet cavity 141 is connected to the connecting port of the water inlet joint 110, and the water outlet cavity 131 is connected to the connecting port of the water outlet joint 120.

[0045] like Figure 3 , Figure 5 and Figure 6 As shown, in one embodiment, an isolation column 210 is provided inside the liquid cooling tube 200, and the isolation column 210 is arranged axially along the liquid cooling tube 200. A water inlet channel 220, a water outlet channel 230 and a flow chamber 240 are opened inside the liquid cooling tube 200. The water inlet channel 220 is separated from the water outlet channel 230 by the isolation column 210. The water inlet channel 220 is located between the inner circumferential wall of the liquid cooling tube 200 and the outer circumferential wall of the isolation column 210. The water outlet channel 230 is located on the inner circumferential wall of the isolation column 210. The flow chamber 240 is located below the water inlet channel 220 and the water outlet channel 230. The water inlet channel 220 is connected with the water outlet channel 230 through the flow chamber 240. The water inlet channel 220 is also connected with the water inlet chamber 141, and the water outlet channel 230 is also connected with the water outlet chamber 131.

[0046] like Figure 2 As shown, in this embodiment, the water inlet joint 110 is located at the top of the first liquid cooling plate 130, the water outlet joint 120 is located at the side of the first liquid cooling plate 140, and the water inlet channel 220 is arranged around the water outlet channel 230, so that the cooling liquid in the water inlet channel 220 can bring the heat generated by the battery cell to the water outlet channel 230, and then pass through the water outlet cavity 131 and lead out from the water outlet joint 120, and the second liquid cooling plate 140 is arranged adjacent to the liquid cooling tube 200, so that the cooling liquid in the water inlet cavity 141 can take away the heat generated by the end face of the battery cell. Furthermore, the number of liquid cooling tubes 200 is multiple.

[0047] Furthermore, if Figure 5 or Figure 6 As shown, the number of water inlet channels 220 is 3, the number of water outlet channels 230 is 1, and an air avoidance groove 201 is opened on the outer peripheral side of the liquid cooling tube 200. The water inlet channels 220 avoid the air avoidance groove 201 and are arranged at intervals around the water outlet channels 230. The air avoidance groove 201 is used to contact the side of the battery cell so as to take away the heat from the side of the battery cell when the cooling liquid flows.

[0048] like Figure 3As shown, in one embodiment, a water inlet column (not shown) is provided inside the first liquid cooling plate 130, one end of the water inlet column is connected to the inner side of the second liquid cooling plate 140 away from the liquid cooling tube 200, and the other end of the water inlet column is connected to a side of the water inlet connector 110 adjacent to the first liquid cooling plate 130, and the connecting port of the water inlet connector 110 is connected to the water inlet cavity 141 through the connecting port of the water inlet column. At this time, the connecting port of the water inlet column is isolated from the water outlet cavity 131, so that the cooling liquid enters the water inlet cavity 141 after passing through the water inlet column from the water inlet connector 110, and no longer passes through the water outlet cavity 131.

[0049] like Figure 3 As shown, in one embodiment, a water outlet column 211 is provided in the extension direction of the isolation column 210 away from the circulation cavity 240, one end of the water outlet column 211 is connected to the inner side of the first liquid cooling plate 130 adjacent to the second liquid cooling plate 140, and the water outlet channel 230 is connected to the water outlet cavity 131 through the connecting port of the water outlet column 211. At this time, the connecting port of the water outlet column 211 is isolated from the water inlet cavity 141, so that the cooling liquid enters the water outlet cavity 131 from the water outlet channel 230 through the water outlet column 211, and no longer passes through the water inlet cavity 141.

[0050] Furthermore, if Figure 4 As shown, a water inlet hole 142 is opened on one side of the second liquid cooling plate 140 adjacent to the liquid cooling tube 200 . The water inlet hole 142 is arranged corresponding to the water inlet channel 220 . The water inlet cavity 141 is connected to the water inlet channel 220 through the water inlet hole 142 .

[0051] like Figure 5 As shown, in one embodiment, the liquid cooling tube 200 is provided with a heat conductive sheet 250, which is sleeved on the outer peripheral side of the liquid cooling tube 200 and is used to abut against the side of the battery core. It can be understood that the heat conductive sheet 250 is used to dissipate heat from the side of the battery core and conduct the heat to the heat conductive sheet 250 itself, so that the temperature difference at different positions on the side of the battery core becomes smaller, which is beneficial to the thermal balance of the battery core and also beneficial to the cooling liquid to take away the heat conducted from the battery core to the heat conductive sheet 250.

[0052] In one embodiment, the liquid cooling tube 200 is an extrusion-molded structure. Further, during the processing of the liquid cooling tube 200, the device performs an extrusion operation on the outer peripheral side of the liquid cooling tube 200 to form the air avoidance groove 201, such as Figure 5 As shown, the air-avoiding groove 201 is used to contact the side of the battery cell.

[0053] like Figure 7 and Figure 8As shown, the present disclosure also provides a battery pack 20, including a battery pack body 300 and a liquid cooling device 10 of any of the above-mentioned embodiments, the battery pack body 300 includes a battery module 310 and a protective cover 320, one side of the battery module 310 is connected to the protective cover 320, and the side of the battery module 310 facing away from the protective cover 320 is connected to the liquid cooling device 10, and part of the structure of the liquid cooling device 10 is located inside the battery module 310.

[0054] like Figure 8 As shown, in one embodiment, the battery module 310 is provided with a first fixing hole 311, and the protective cover 320 is provided with a fixing groove 321. The first fixing hole 311 and the fixing groove 321 are correspondingly arranged, and the liquid cooling pipe 200 is successively passed through the first fixing hole 311 and the fixing groove 321. The end of the liquid cooling pipe 200 away from the liquid cooling plate 100 is located in the fixing groove 321 and connected to the protective cover 320. It can be understood that the liquid cooling pipe 200 is passed through the first fixing hole 311 to fix the battery module 310, and the liquid cooling pipe 200 is passed through the fixing groove 321 to connect to the protective cover 320.

[0055] Furthermore, if Figure 2 and Figure 8 As shown, the end of the liquid cooling tube 200 away from the liquid cooling plate 100 is covered with a pipe end cover 202, and the outer side of the pipe end cover 202 abuts against the groove wall of the fixing groove 321 to protect the end of the liquid cooling tube 200, and also serves as a connection to the protective cover 320.

[0056] like Figure 8 As shown, in one embodiment, the battery pack body 300 also includes a thermally conductive pad 330 and a thermally insulating pad 340. The thermally conductive pad 330 is located between the second liquid cooling plate 140 and the battery module 310, so that the heat generated by the end face of the battery cell can be transferred to the entire thermally conductive pad 330, so that the temperature difference of the end face of each battery cell becomes smaller, which facilitates the cooling liquid to take away the heat. The thermally insulating pad 340 is located between the battery module 310 and the protective cover 320 to prevent the heat from the end face of the battery cell from being transferred to the protective cover 320 to avoid deformation due to temperature changes.

[0057] like Figure 8 As shown, in one embodiment, the thermal pad 330 is provided with a second fixing hole 331, the thermal insulation pad 340 is provided with a third fixing hole 341, the second fixing hole 331 is arranged corresponding to the third fixing hole 341 through the first fixing hole 311, and the liquid cooling tube 200 is successively penetrated through the second fixing hole 331, the first fixing hole 311, the third fixing hole 341 and the fixing groove 321. It can be understood that the liquid cooling tube 200 is penetrated through the second fixing hole 331 to fix the thermal pad 330, and the liquid cooling tube 200 is penetrated through the third fixing hole 341 to fix the thermal insulation pad 340, and at the same time protects the protective cover 320 to prevent the protective cover 320 from being deformed due to the heating of the end surface of the battery cell.

[0058] like Figure 8 As shown, in one embodiment, the battery pack body 300 also includes a bus 350, and the bus 350 includes a first abutting portion 351, an electrical connection portion 352, and a second abutting portion 353 connected to each other. The first abutting portion 351 abuts against an inner side of the battery module 310, and the second abutting portion 353 abuts against a corresponding inner side of the battery module 310. One side of the electrical connection portion 352 abuts against a side of the thermal insulation pad 340 away from the protective cover 320, and the electrical connection portion 352 is used to be electrically connected to the battery cell. It can be understood that one side of the electrical connection portion 352 abuts against a side of the thermal insulation pad 340 away from the protective cover 320. When the battery cell is working, the electrical connection portion 352 is electrically connected to the battery cell, and the heat generated by the operation of the battery cell is absorbed by the thermal insulation pad 340.

[0059] like Figure 8 As shown, in one embodiment, the battery pack body 300 also includes a first locking member 360 and a second locking member 370, the liquid cooling plate 100 is provided with a first through hole 101, the thermal pad 330 is provided with a second through hole 332, and the battery module 310 is provided with a third through hole 312. The first through hole 101, the second through hole 332 and the third through hole 312 are arranged correspondingly, and the first locking member 360 is successively penetrated through the first through hole 101, the second through hole 332 and the third through hole 312 to screw the liquid cooling plate 100, the thermal pad 330 and the battery module 310 through the first locking member 360, and the top of the first locking member 360 is located in the first through hole 101.

[0060] like Figure 8 As shown, in one embodiment, the protective cover 320 is provided with a fourth through hole 322, the thermal insulation pad 340 is provided with a fifth through hole 342, the fourth through hole 322, the fifth through hole 342 and the third through hole 312 are correspondingly arranged, and the second locking member 370 is successively passed through the fourth through hole 322, the fifth through hole 342 and the third through hole 312 to screw the battery module 310, the thermal conductive pad 330 and the protective cover 320 through the second locking member 370, and the top of the second locking member 370 is located in the fourth through hole 322.

[0061] Compared with the prior art, the present invention has at least the following advantages:

[0062] In the above-mentioned liquid cooling device 10, a water outlet cavity 131 is provided inside the first liquid cooling plate 130, a water inlet cavity 141 is provided inside the second liquid cooling plate 140, and a water cooling tube 200 is provided with a water inlet channel 220, a flow cavity 240 and a water outlet channel 230 which are connected in sequence. When the liquid cooling device 10 is working, the cooling liquid enters the water inlet cavity 141 from the water inlet joint 110 in turn, and then passes through the water inlet channel 220, the flow cavity 240 and the water outlet channel 230 in turn to reach the water outlet cavity 131, and finally is led out from the water outlet joint 120. During the whole process, a side of the second liquid cooling plate 140 adjacent to the liquid cooling tube 200 contacts the end face of the battery cell, and the outer peripheral wall of the liquid cooling tube 200 contacts the side face of the battery cell to cool the battery cell and effectively dissipate the heat of the battery cell. Compared with the prior art, the contact area between the cooling liquid and the battery cell under this structure is increased, and such a contact area enables the cooling liquid to further carry away the heat generated by the battery cell through the flow of liquid.

[0063] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A liquid cooling device, comprising a liquid cooling plate and a liquid cooling tube, wherein the liquid cooling tube is connected to the bottom of the liquid cooling plate, a water inlet joint and a water outlet joint are arranged on a side of the liquid cooling plate away from the bottom, the water inlet joint and the water outlet joint are arranged staggered, the outer peripheral wall of the liquid cooling tube is used to abut the side of the battery cell, and the side of the liquid cooling plate adjacent to the liquid cooling tube is used to abut the end face of the battery cell, It is characterized in that The liquid cooling plate comprises a first liquid cooling plate and a second liquid cooling plate, the liquid cooling tube is connected to one side of the second liquid cooling plate, the first liquid cooling plate is arranged on one side of the second liquid cooling plate away from the liquid cooling tube, a water outlet cavity is provided inside the first liquid cooling plate, a water inlet cavity is provided inside the second liquid cooling plate, the water inlet cavity is communicated with the connecting port of the water inlet joint, and the water outlet cavity is communicated with the connecting port of the water outlet joint; An isolation column is provided inside the liquid cooling tube, and the isolation column is arranged along the axial direction of the liquid cooling tube. A water inlet channel, a water outlet channel and a circulation cavity are opened inside the liquid cooling tube. The water inlet channel is spaced apart from the water outlet channel by the isolation column. The water inlet channel is located between the inner circumferential wall of the liquid cooling tube and the outer circumferential wall of the isolation column, the water outlet channel is located on the inner circumferential wall of the isolation column, and the circulation cavity is located below the water inlet channel and the water outlet channel. The water inlet channel is connected with the water outlet channel through the circulation cavity, the water inlet channel is also connected with the water inlet cavity, and the water outlet channel is also connected with the water outlet cavity.

2. The liquid cooling device according to claim 1, It is characterized in that A water inlet column is provided inside the first liquid cooling plate, one end of the water inlet column is connected to the inner side of the second liquid cooling plate away from the liquid cooling tube, the other end of the water inlet column is connected to a side of the water inlet joint adjacent to the first liquid cooling plate, and the connecting port of the water inlet joint is connected to the water inlet cavity through the connecting port of the water inlet column.

3. The liquid cooling device according to claim 1, It is characterized in that The isolation column is provided with a water outlet column in the extension direction away from the circulation cavity. One end of the water outlet column is connected to the inner side of the first liquid cooling plate adjacent to the second liquid cooling plate. The water outlet channel is connected to the water outlet cavity through the communication port of the water outlet column.

4. The liquid cooling device according to claim 1, It is characterized in that The liquid cooling tube is provided with a heat conducting sheet, the heat conducting sheet is sleeved on the outer peripheral side of the liquid cooling tube, and the heat conducting sheet is used to abut against the side surface of the battery core; and / or, The liquid cooling tube is an extrusion-molded structure.

5. A battery pack, It is characterized in that It comprises a battery pack body and the liquid cooling device according to any one of claims 1 to 4, wherein the battery pack body comprises a battery module and a protective cover, one side of the battery module is connected to the protective cover, and the side of the battery module facing away from the protective cover is connected to the liquid cooling device, and part of the structure of the liquid cooling device is located inside the battery module.

6. The battery pack according to claim 5, It is characterized in that The battery module is provided with a first fixing hole, and the protective cover is provided with a fixing groove. The first fixing hole and the fixing groove are arranged correspondingly, and the liquid cooling pipe is successively passed through the first fixing hole and the fixing groove. The end of the liquid cooling pipe away from the liquid cooling plate is located in the fixing groove and connected to the protective cover.

7. The battery pack according to claim 6, It is characterized in that The battery pack body further includes a heat-conducting pad and a heat-insulating pad, wherein the heat-conducting pad is located between the second liquid cooling plate and the battery module, and the heat-insulating pad is located between the battery module and the protective cover; The thermal conductive pad is provided with a second fixing hole, the thermal insulating pad is provided with a third fixing hole, the second fixing hole is arranged corresponding to the third fixing hole through the first fixing hole, and the liquid cooling pipe is successively passed through the second fixing hole, the first fixing hole, the third fixing hole and the fixing groove.

8. The battery pack according to claim 7, It is characterized in that The battery pack body also includes a bus, which includes a first abutting portion, an electrical connecting portion and a second abutting portion that are connected to each other. The first abutting portion abuts against an inner side of the battery module, and the second abutting portion abuts against a corresponding inner side of the battery module. One side of the electrical connecting portion abuts against a side of the thermal insulation pad that is away from the protective cover, and the electrical connecting portion is used to be electrically connected to the battery cell.

9. The battery pack according to claim 7, It is characterized in that The battery pack body also includes a first locking member and a second locking member, the liquid cooling plate is provided with a first through hole, the thermal conductive pad is provided with a second through hole, and the battery module is provided with a third through hole. The first through hole, the second through hole and the third through hole are arranged correspondingly, the first locking member is successively passed through the first through hole, the second through hole and the third through hole, and the top of the first locking member is located in the first through hole.

10. The battery pack according to claim 9, It is characterized in that The protective cover is provided with a fourth through hole, the thermal insulation pad is provided with a fifth through hole, the fourth through hole, the fifth through hole and the third through hole are arranged correspondingly, the second locking member is successively passed through the fourth through hole, the fifth through hole and the third through hole, and the top of the second locking member is located in the fourth through hole.

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