Battery pack and electric device

Abstract

Disclosed are a battery pack and an electric device. A current collector is arranged on a first face of a liquid cooling plate, and a first cavity and a second cavity are provided inside the current collector; a first liquid outlet and a second liquid outlet are provided in a first wall of the current collector, a second liquid inlet is in communication with a first liquid inlet, and the second liquid outlet is in communication with the first liquid outlet, thereby separating incoming liquid from outgoing liquid to avoid the situation of cross flow; and openings are provided in a second wall, the first wall located at the periphery of the first liquid outlet is sealingly connected to the first face by means of the openings, and the first wall located at the periphery of the first liquid inlet is sealingly connected to the first face by means of the openings, thereby achieving the sealing of the communication position between the first liquid outlet and the second liquid outlet and the sealing of the communication position between the first liquid inlet and the second liquid inlet.

Description

Battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 2024208289413, filed on April 19, 2024, and entitled "Battery pack and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0003] The assembly between the liquid cooling plate and the current collecting box is to weld the outer periphery of the current collecting box and the liquid cooling plate together. The welding process is easy to cause the deformation of the current collecting box and the liquid cooling plate, affecting the flatness of the contact surface of the liquid cooling plate and the current collecting box, and is easy to cause the gap between the liquid inlet and the liquid outlet on the current collecting box and the liquid inlet and the liquid outlet on the liquid cooling plate, thereby increasing the risk of liquid inlet and outlet cross flow and leakage of the heat conducting medium, affecting the heat conduction effect of the liquid cooling plate and the service life and safety of the battery pack. SUMMARY

[0004] In a first aspect, the embodiments of the present application provide a battery pack, the battery pack has a first direction and a third direction intersecting each other, and the battery pack comprises: a liquid cooling plate, the liquid cooling plate is internally provided with a flow channel for flowing of a heat conducting medium, the flow channel extends along the first direction, the liquid cooling plate comprises a first face and a second face oppositely arranged along the third direction, and the first face is provided with a first liquid inlet and a first liquid outlet which respectively communicate with the flow channel; a current collecting member arranged on the first face, the current collecting member is internally provided with a first chamber and a second chamber which are arranged at intervals along the first direction, and the current collecting member comprises a first wall and a second wall oppositely arranged along the third direction; the first wall abuts against the first face, the first wall is provided with a second liquid inlet communicating with the first chamber and a second liquid outlet communicating with the second chamber, the second liquid inlet communicates with the first liquid inlet, and the second liquid outlet communicates with the first liquid outlet; the second wall is provided with an opening, the first chamber and the second chamber respectively communicate with the opening, and the second liquid inlet and the second liquid outlet are oppositely arranged with the opening along the third direction to seal and connect the first wall located at the outer periphery of the second liquid inlet and the first face through the opening and seal and connect the first wall located at the outer periphery of the second liquid outlet and the first face through the opening; and a first plugging member which is sealingly connected to the opening.

[0005] In a second aspect, the embodiments of the present application further provide an electric device comprising the battery pack as described above. BRIEF DESCRIPTION OF DRAWINGS

[0006] Fig. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0007] Fig. 2 is a sectional view along A-A of Fig. 1;

[0008] Fig. 3 is an enlarged structural schematic diagram of B of Fig. 2;

[0009] Fig. 4 is a structural schematic diagram of a first angle of a combination of a liquid cooling plate and a current collector in a battery pack according to an embodiment of the present application;

[0010] Fig. 5 is a side view of Fig. 4;

[0011] Fig. 6 is a structural schematic diagram of a second angle of a combination of a liquid cooling plate and a current collector in a battery pack according to an embodiment of the present application and an enlarged structural schematic diagram of C;

[0012] Fig. 7 is a structural schematic diagram of a third angle of a combination of a liquid cooling plate and a current collector in a battery pack according to an embodiment of the present application;

[0013] Fig. 8 is a structural schematic diagram of Fig. 7 with a part of a connecting member removed;

[0014] Fig. 9 is a sectional view along D-D of Fig. 4;

[0015] Fig. 10 is an enlarged structural schematic diagram of E of Fig. 9;

[0016] Fig. 11 is a sectional view along F-F of Fig. 5;

[0017] Fig. 12 is a structural schematic diagram of a first angle of a liquid cooling plate in a battery pack according to an embodiment of the present application;

[0018] Fig. 13 is a structural schematic diagram of a second angle of a liquid cooling plate in a battery pack according to an embodiment of the present application;

[0019] Fig. 14 is a structural schematic diagram of a first angle of a current collector in a battery pack according to an embodiment of the present application;

[0020] Fig. 15 is a structural schematic diagram of a second angle of a current collector in a battery pack according to an embodiment of the present application;

[0021] Fig. 16 is a sectional view along G-G of Fig. 14;

[0022] Fig. 17 is a structural schematic diagram of a connecting member in a battery pack according to an embodiment of the present application;

[0023] Fig. 18 is a structural schematic diagram of a second blocking member in a battery pack according to an embodiment of the present application;

[0024] Fig. 19 is a structural schematic diagram of a third blocking member in a battery pack according to an embodiment of the present application. Embodiments of the present application

[0025] The application provides a secondary battery and a battery pack. To make the purpose, technical solutions and effects of the application clearer and more explicit, the application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0026] The present embodiment provides a kind of electric device, including a battery pack 1, battery pack 1 as the power supply of the electric device. The electric device can be but not limited to mobile device (such as mobile phone, notebook computer etc.), electric vehicle (such as pure electric vehicle, oil-electric hybrid electric vehicle, plug-in hybrid electric vehicle, electric bicycle, electric scooter, electric golf cart, electric truck etc.), electric train, ship and satellite, energy storage system etc.

[0027] In some embodiments of the application, a battery pack 1 is provided, referring to FIGS. 1-19, the battery pack 1 includes a liquid cooling plate 10, a current collector 20 and a first blocking member 30. The battery pack 1 has a first direction X, a second direction Y and a third direction Z intersecting with each other, and in the embodiments shown in FIGS. 1-19, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0028] Referring to FIGS. 1-2 and 4-13, and specifically to FIG. 11, the liquid cooling plate 10 is internally provided with a flow channel 11 for flowing of a heat-conducting medium, the flow channel 11 extends along the first direction X, referring to FIGS. 4-8 and 12-13, the liquid cooling plate 10 includes a first face 101 and a second face 102 oppositely arranged along the third direction Z, referring to FIGS. 12-15, the liquid cooling plate 10 further includes a third face 103 and a fourth face 104 oppositely arranged along the first direction X, and referring to FIG. 12, the first face 101 of the liquid cooling plate 10 is provided with a first liquid inlet 12 and a first liquid outlet 13 respectively communicating with the flow channel 11.

[0029] Referring to FIGS. 1, 4-6, 9, and 14-16, and specifically to FIGS. 1, 4, 6, and 9, the current collector 20 is arranged on the first face 101 of the liquid cooling plate 10, and extends along the second direction Y. Referring to FIG. 16, the current collector 20 is internally provided with the first chamber 201 and the second chamber 202 arranged at intervals along the first direction X. Referring to FIGS. 9 and 14-16, the current collector 20 includes the first wall 21 and the second wall 22 oppositely arranged along the third direction Z. Referring to FIG. 9, the first wall 21 of the current collector 20 abuts against the first face 101 of the liquid cooling plate 10, in other words, the first wall 21 is stacked with the first face 101 along the third direction Z. Referring to FIGS. 14-16, the first wall 21 is provided with the second liquid inlet 211 communicating with the first chamber 201 and the second liquid outlet 212 communicating with the second chamber 202. The second liquid inlet 211 communicates with the first liquid inlet 12 arranged on the first face 101 of the liquid cooling plate 10. The second liquid outlet 212 communicates with the first liquid outlet 13 arranged on the first face 101 of the liquid cooling plate 10. Referring to FIG. 14, the second wall 22 of the current collector 20 is provided with the opening 220. The first chamber 201 and the second chamber 202 respectively communicate with the opening 220. The second liquid inlet 211 and the second liquid outlet 212 are oppositely arranged with the opening 220 along the third direction Z. Specifically, the second liquid inlet 211 is oppositely arranged with the opening 220 along the third direction Z, so as to seal and connect the first wall 21 located at the periphery of the second liquid inlet 211 with the first face 101 of the liquid cooling plate 10 through the opening 220. Specifically, the first wall 21 located at the periphery of the second liquid inlet 211 is seal and connected with the first face 101 located at the periphery of the first liquid inlet 12 through the opening 220. The second liquid outlet 212 is oppositely arranged with the opening 220 along the third direction Z, so as to seal and connect the first wall 21 located at the periphery of the second liquid outlet 212 with the first face 101 of the liquid cooling plate 10 through the opening 220. Specifically, the first wall 21 located at the periphery of the second liquid outlet 212 is seal and connected with the first face 101 located at the periphery of the first liquid outlet 13 through the opening 220.

[0030] Referring to FIGS. 1, 4, 6, and 9, the plugging piece 30 is seal and connected with the opening 220, so as to form a seal for the first chamber 201 and the second chamber 202.

[0031] In the battery pack, in order to ensure smooth flow of the heat-conducting medium in the liquid cooling plate, a flow collecting box needs to be arranged on the liquid cooling plate. The flow collecting box is used to centrally manage the supply and return flow of the heat-conducting medium from the supply source. Specifically, the externally supplied heat-conducting medium enters the flow channel of the liquid cooling plate through the flow collecting box and exchanges heat with the battery monomer in the battery pack to regulate the temperature of the battery monomer. The heat-exchanged heat-conducting medium is centrally returned to the external supply source through the flow collecting box to realize the circulating flow of the heat-conducting medium. The assembly mode between the flow collecting box and the liquid cooling plate is to weld the outer periphery of the flow collecting box and the liquid cooling plate together. This full-welding mode of the outer ring accumulates a high amount of heat during welding, which is likely to cause deformation of the flow collecting box and / or the liquid cooling plate, affect the flatness of the contact surface between the flow collecting box and the liquid cooling plate, and further cause gaps between the liquid inlet on the liquid cooling plate and the liquid inlet on the flow collecting box and between the liquid outlet on the liquid cooling plate and the liquid outlet on the flow collecting box. Furthermore, this may cause cross-flow of the liquid inlet and the liquid outlet (i.e. the return liquid) of the heat-conducting medium and increase the risk of leakage of the heat-conducting medium, affect the heat conduction effect between the liquid cooling plate and the battery monomer, and affect the service life and safety of the battery pack.

[0032] The battery pack 1 provided by the embodiment of the present application sets the current collector 20 on the first surface 101 of the liquid cooling plate 10, and the first wall 21 of the current collector 20 abuts against the first surface 101 of the liquid cooling plate 10. The first chamber 201 and the second chamber 202 are arranged in the current collector 20 in a spaced manner, and the second liquid inlet 211 communicating with the first chamber 201 and the second liquid outlet 212 communicating with the second chamber 202 are formed on the first wall 21, and the second liquid inlet 211 communicates with the first liquid inlet 12 on the first surface 101 of the liquid cooling plate 10, and the second liquid outlet 212 communicates with the first liquid outlet 13 on the first surface 101 of the liquid cooling plate 10, so as to separate the liquid inlet passage (located in the first chamber 201) and the liquid outlet passage (located in the second chamber 202) between the current collector 20 and the liquid cooling plate 10; and the opening 220 is formed on the second wall 22 of the current collector 20, and the first chamber 201 and the second chamber 202 respectively communicate with the opening 220, so that the first wall 21 located outside the periphery of the second liquid inlet 211 and the first surface 101 of the liquid cooling plate 10 can be sealed and connected through the opening 220, and the first wall 21 located outside the periphery of the second liquid outlet 212 and the first surface 101 of the liquid cooling plate 10 can be sealed and connected through the opening 220, that is, only the first wall 21 located outside the periphery of the second liquid inlet 211 and the first surface 101 located outside the periphery of the first liquid inlet 12 need to be sealed and connected through the opening 220 to form a local seal, and the first wall 21 located outside the periphery of the second liquid outlet 212 and the first surface 101 located outside the periphery of the first liquid outlet 13 need to be sealed and connected through the opening 220 to form a local seal. Compared with the mode of sealing the whole periphery of the current collector 20 and the first surface 101 of the liquid cooling plate 10, the local seal effectively reduces the probability of deformation of the current collector 20 and / or the liquid cooling plate 10 during the sealing process, thereby ensuring the flatness of the first wall 21 of the current collector 20 and the first surface 101 of the liquid cooling plate 10, and reducing the risk of liquid inlet in the first chamber 201 and liquid outlet in the second chamber 202. Moreover, the communication between the second liquid inlet 211 and the first liquid inlet 12 is sealed, and the communication between the second liquid outlet 212 and the first liquid outlet 13 is sealed, so that the heat-conducting medium in the first chamber 201 can only enter the liquid cooling plate 10 through the first liquid inlet 12, and the heat-conducting medium in the liquid cooling plate 10 after heat exchange can only enter the second chamber 202 through the first liquid outlet 13, further reducing the risk of liquid inlet in the first chamber 201 and liquid outlet in the second chamber 202 and the risk of leakage of the heat-conducting medium, and the setting of the first plugging member 30 can form plugging of the opening 220, thereby ensuring the sealing of the first chamber 201 and the second chamber 202, and ensuring the heat conduction effect between the liquid cooling plate 10 and the battery monomer, thereby improving the service life and safety of the battery pack 1. Moreover, the structural design of the current collector 20 can reduce the use of the water nozzle and the quick connector plug in the battery pack 1, thereby reducing the manufacturing cost of the battery pack 1.

[0033] In some embodiments, the first sealing member 30 is welded with the opening 220 to form a fixed connection, and after the sealing of the communication between the second liquid inlet 211 and the first liquid inlet 12 is completed, the welding between the first sealing member 30 and the opening 220 is sealed.

[0034] In some embodiments, the first sealing member 30 is detachably connected with the opening 220, for example, the first sealing member 30 is covered on the opening 220, and a sealing ring is arranged between the first sealing member 30 and the opening 220 to realize the sealed connection, which is convenient for subsequent maintenance and maintenance.

[0035] In some embodiments, referring to FIG. 14, the opening 220 includes a first opening 221 and a second opening 222, the first opening 221 is in communication with the first chamber 201, and the first opening 221 and the second liquid inlet 211 are oppositely arranged along the third direction Z, so as to seal and connect the first wall 21 located at the outer periphery of the second liquid inlet 211 and the first surface 101 located at the outer periphery of the first liquid inlet 12 through the first opening 221. The second opening 222 is in communication with the second chamber 202, and the second opening 222 and the second liquid outlet 212 are oppositely arranged along the third direction Z, so as to seal and connect the first wall 21 located at the outer periphery of the second liquid outlet 212 and the first surface 101 located at the outer periphery of the first liquid outlet 13 through the second opening 222. The first opening 221 and the second opening 222 are arranged at intervals, which can form an opening design for the first chamber 201 and the second chamber 202 to communicate respectively, so as to avoid the case that one opening crosses the first chamber 201 and the second chamber 202, thereby ensuring the strength of the current collecting piece 20.

[0036] In some embodiments, the first wall 21 located at the outer periphery of the second liquid inlet 211 and the first surface 101 located at the outer periphery of the first liquid inlet 12 are welded and connected through the first opening 221 to seal the communication between the second liquid inlet 211 and the first liquid inlet 12. Specifically, the first wall 21 located at the outer periphery of the second liquid inlet 211 and the first surface 101 located at the outer periphery of the first liquid inlet 12 can be sealed and connected by laser welding through the first opening 221. Specifically, the laser welding is welded in a segment welding manner. Compared with the full welding welding manner of the outer ring, the segment welding has a short welding seam and relatively low heat accumulation in the welding process, which effectively reduces the deformation problem of the current collecting piece 20 and the liquid cooling plate 10 caused by welding.

[0037] In some embodiments, the first wall 21 located at the outer periphery of the second liquid outlet 212 is welded to the first surface 101 located at the outer periphery of the first liquid outlet 13 through the second opening 222 to seal the communication between the second liquid outlet 212 and the first liquid outlet 13. Specifically, the first wall 21 located at the outer periphery of the second liquid outlet 212 can be laser welded to the first surface 101 located at the outer periphery of the first liquid outlet 13 through the second opening 222. Specifically, the laser welding is performed in a segment welding manner.

[0038] In some embodiments, the first wall 21 located at the outer periphery of the second liquid inlet 211 is glued to the first surface 101 located at the outer periphery of the first liquid inlet 12 through the first opening 221 to seal the communication between the second liquid inlet 211 and the first liquid inlet 12. Specifically, the glue gun can be used to spray glue between the first wall 21 located at the outer periphery of the second liquid inlet 211 and the first surface 101 located at the outer periphery of the first liquid inlet 12 through the first opening 221 to achieve sealing connection.

[0039] In some embodiments, the first wall 21 located at the outer periphery of the second liquid outlet 212 is glued to the first surface 101 located at the outer periphery of the first liquid outlet 13 through the second opening 222 to seal the communication between the second liquid outlet 212 and the first liquid outlet 13. Specifically, the glue gun can be used to spray glue between the first wall 21 located at the outer periphery of the second liquid outlet 212 and the first surface 101 located at the outer periphery of the first liquid outlet 13 through the second opening 222 to achieve sealing connection.

[0040] In some embodiments, referring to FIG. 12, the number of first liquid inlets 12 on the liquid cooling plate 10 is multiple, and the first liquid inlets 12 are arranged on the first surface 101 in the second direction Y. The second liquid inlets 211 on the first wall 21 of the current collector 20 correspond to the first liquid inlets 12 in number. One first opening 221 is arranged opposite to at least one second liquid inlet 211 in the third direction Z. Specifically, as shown in the embodiment of FIG. 14, the number of first openings 221 corresponds to the number of second liquid inlets 211. In other implementation manners, one first opening 221 can correspond to multiple second liquid inlets 211. Specifically, the actual use requirements can be selected.

[0041] In some embodiments, referring to FIG. 12, the number of first liquid outlets 13 on the liquid cooling plate 10 is multiple, and the first liquid outlets 13 are arranged on the first surface 101 in the second direction Y. The second liquid outlets 212 on the first wall 21 of the current collector 20 correspond to the first liquid outlets 13 in number. One second opening 222 is arranged opposite to at least one second liquid outlet 212 in the third direction Z. In the embodiment shown in FIG. 14, the number of second openings 222 corresponds to the number of second liquid outlets 212. In other implementations, one second opening 222 can correspond to multiple second liquid outlets 212. The specific selection can be made according to the actual use requirements.

[0042] In some embodiments, by adjusting the inner diameter of the first liquid inlet 12 and the first liquid outlet 13 on the liquid cooling plate 10, the flow uniformity of the liquid cooling plate 10 between adjacent battery monomers in the second direction Y can be adjusted. At the same time, the improvement of the flow uniformity also reduces the pressure drop of the liquid cooling plate 10.

[0043] In some embodiments, referring to FIG. 16, the current collector 20 is internally provided with a cavity 200, and the cavity 200 is internally provided with a first partition plate 203. The first partition plate 203 extends in the second direction Y, and the first partition plate 203 divides the cavity 200 into a first chamber 201 and a second chamber 202 arranged in the first direction X. The arrangement of the first partition plate 203 can form the first chamber 201 and the second chamber 202 independent of each other in one current collector 20, thereby reducing the manufacturing cost of the current collector 20.

[0044] In some embodiments, the number of current collectors 20 is two, and the two current collectors 20 are arranged in the first direction X on the first surface 101 of the liquid cooling plate 10. One current collector 20 is internally provided with the first chamber 201, and the other current collector 20 is internally provided with the second chamber 202, thereby completely separating the first chamber 201 and the second chamber 202, and further avoiding the cross-flow of the liquid inlet in the first chamber 201 and the liquid outlet in the second chamber 202.

[0045] In some embodiments, referring to FIG. 1, the battery pack 1 further comprises a liquid inlet pipe 40 and a liquid outlet pipe 50, referring to FIG. 14, the second wall 22 of the current collector 20 is provided with a liquid inlet port 223 communicating with the first chamber 201 and a liquid outlet port 224 communicating with the second chamber 202, the liquid inlet pipe 40 is inserted into the liquid inlet port 223 to supply the heat-conducting medium to the first chamber 201, specifically, the heat-conducting medium supplied by the liquid inlet pipe 40 enters the flow channel 11 of the liquid cooling plate 10 through the second liquid inlet port 211 and the first liquid inlet port 12 to conduct heat with the battery monomer in the battery pack 1, and the liquid outlet pipe 50 is inserted into the liquid outlet port 224 to discharge the heat-conducting medium in the second chamber 202. Specifically, the heat-conducting medium in the flow channel 11 of the liquid cooling plate 10 after heat conduction enters the second chamber 202 through the first liquid outlet port 13 and the second liquid outlet port 212, and is discharged through the liquid outlet pipe 50. The liquid inlet pipe 40 and the liquid outlet pipe 50 can be used in cooperation with the current collector 20 to supply the heat-conducting medium to the liquid cooling plate 10, and can be used in cooperation with the current collector 20 to form a concentrated discharge of the heat-conducting medium after heat exchange, thereby reducing the use of the water nozzle and the quick connector plug in the battery pack 1, reducing the manufacturing cost of the battery pack 1, and improving the space utilization of the battery pack 1.

[0046] In some embodiments, referring to FIG. 1 and FIG. 2, the battery pack 1 further comprises a box body 60, the box body 60 is internally provided with a containing cavity 601, the box body 60 comprises a first end wall 61 and a second end wall 62 oppositely arranged along the third direction Z, the second end wall 62 is provided with a third opening 621 communicating with the containing cavity 601, referring to FIG. 1, the box body 60 further comprises a third end wall 63 and a fourth end wall 64 oppositely arranged along the first direction X, the liquid inlet pipe 40 and the liquid outlet pipe 50 are respectively inserted into the third end wall 63, the liquid inlet pipe 40 and the liquid outlet pipe 50 are spaced apart along the second direction Y, one end of the liquid inlet pipe 40 away from the liquid inlet port 223 is located outside the box body 60, and one end of the liquid outlet pipe 50 away from the liquid outlet port 224 is located outside the box body 60.

[0047] In some embodiments, referring to FIG. 11, the liquid cooling plate 10 is internally provided with at least one second partition plate 14 extending along the first direction X, and the opposite ends of the second partition plate 14 along the first direction X are connected with the third face 103 and the fourth face 104 of the liquid cooling plate 10 respectively, so as to form at least two flow channels 11 spaced along the second direction Y inside the liquid cooling plate 10. In the embodiment shown in FIG. 11, the number of second partition plates 14 inside each liquid cooling plate 10 is two, and the two second partition plates 14 are spaced along the second direction Y, so as to form three mutually independent flow channels 11 spaced along the second direction Y inside the liquid cooling plate 10. The design of the second partition plate 14 can increase the number of flow channels 11 inside the liquid cooling plate 10, and thus improve the utilization efficiency of the heat conducting medium inside the liquid cooling plate 10. Among them, the first liquid inlet 12 and the flow channel 11 correspond in number, and the first liquid outlet 13 and the flow channel 11 correspond in number.

[0048] In some embodiments, referring to FIG. 11, the flow channel 11 of the liquid cooling plate 10 is internally provided with a third partition plate 15 extending along the first direction X, one end of the opposite ends of the third partition plate 15 along the first direction X is connected with the third face 103 of the liquid cooling plate 10, and the other end has a first gap 151 with the fourth face 104, and the third partition plate 15 separates the flow channel 11 into liquid inlet section 111 and liquid outlet section 112 spaced along the second direction Y, and the liquid inlet section 111 and the liquid outlet section 112 are communicated through the first gap 151. The liquid inlet section 111 is communicated with the first liquid inlet 12 of the liquid cooling plate 10, and the liquid inlet section 111 and the first liquid inlet 12 correspond in number. The liquid outlet section 112 is communicated with the first liquid outlet 13, and the liquid outlet section 112 and the first liquid outlet 13 correspond in number. In the embodiment shown in FIG. 11, the third partition plate 15 and the flow channel 11 correspond in number. The arrangement of the third partition plate 15 can separate the flow channel 11 into the liquid inlet section 111 and the liquid outlet section 112 connected at one end in the first direction X, which can ensure the smooth flow of the heat conducting medium in the flow channel 11, avoid excessive mixing of liquid inlet and liquid outlet, and thus ensure the heat conduction efficiency between the liquid cooling plate 10 and the battery monomer.

[0049] In some embodiments, referring to FIG. 11, the liquid inlet section 111 of the flow channel 11 is internally provided with at least one fourth partition plate 16 extending along the first direction X, and the opposite ends of the fourth partition plate 16 along the first direction X are respectively provided with a second gap 161 between the third face 103 and the fourth face 104, in other words, one end of the fourth partition plate 16 along the first direction X is provided with a second gap 161 between the third face 103, and the other end of the fourth partition plate 16 along the first direction X is provided with a second gap 161 between the fourth face 104, and the fourth partition plate 16 divides the liquid inlet section 111 into at least two liquid inlet flow channels 1111 spaced along the second direction Y, and the at least two liquid inlet flow channels 1111 are communicated through the second gap 161. In the embodiment shown in FIG. 11, the number of fourth partition plates 16 in the liquid inlet section 111 is two, and the two fourth partition plates 16 are spaced along the second direction Y in the liquid inlet section 111 to form three liquid inlet flow channels 1111 spaced along the second direction Y in the liquid inlet section 111, and the design of the plurality of liquid inlet flow channels 1111 in the liquid inlet section 111 can improve the uniformity of the flow of the heat conducting medium in the liquid inlet section 111.

[0050] In some embodiments, referring to FIG. 11, the liquid outlet section 112 of the flow channel 11 is internally provided with at least one fourth partition plate 16 extending along the first direction X, and the opposite ends of the fourth partition plate 16 along the first direction X are respectively provided with a second gap 161 between the third face 103 and the fourth face 104, in other words, one end of the fourth partition plate 16 along the first direction X is provided with a second gap 161 between the third face 103, and the other end of the fourth partition plate 16 along the first direction X is provided with a second gap 161 between the fourth face 104, and the fourth partition plate 16 divides the liquid outlet section 112 into at least two liquid outlet flow channels 1121 spaced along the second direction Y, and the at least two liquid outlet flow channels 1121 are communicated through the second gap 161. In the embodiment shown in FIG. 11, the number of fourth partition plates 16 in the liquid outlet section 112 is two, and the two fourth partition plates 16 are spaced along the second direction Y in the liquid outlet section 112 to form three liquid outlet flow channels 1121 spaced along the second direction Y in the liquid outlet section 112, and the design of the plurality of liquid outlet flow channels 1121 in the liquid outlet section 112 can improve the uniformity of the flow of the heat conducting medium in the liquid outlet section 112.

[0051] In some embodiments, referring to FIGS. 2-3, 5-11 and 17, the battery pack 1 further comprises a connecting piece 70 and a fixing piece 71. Referring to FIG. 3, the first end wall 61 of the box 60 is provided with a mounting hole 611 penetrating the first end wall 61 in the third direction Z. Referring to FIGS. 1 and 2, the liquid cooling plate 10 is arranged in the accommodating cavity 601 of the box 60, and the liquid cooling plate 10 is arranged spaced apart from the first end wall 61 of the box 60 in the third direction Z. Referring to FIGS. 1-2, 4, 6-8 and 11-13, the number of liquid cooling plates 10 is at least two, and the at least two liquid cooling plates 10 are arranged spaced apart in the second direction Y. Specifically, as shown in the embodiments of FIGS. 3-4 and 10, the at least two liquid cooling plates 10 include a first liquid cooling plate 10a and a second liquid cooling plate 10b. Referring to FIGS. 3, 8, 10 and 13, the second surface 102 of the at least two liquid cooling plates 10 is provided with a groove 1021 on each side adjacent in the second direction Y. Specifically, the second surface 102 of the first liquid cooling plate 10a is provided with a groove 1021 adjacent to one side of the second liquid cooling plate 10b in the second direction Y, and the second surface 102 of the second liquid cooling plate 10b is provided with a first groove 1021 adjacent to one side of the first liquid cooling plate 10a in the second direction Y. Referring to FIG. 3, the connecting piece 70 is arranged between the first end wall 61 of the box 60 and the liquid cooling plate 10. Referring to FIGS. 3 and 10, the two ends of the connecting piece 70 arranged opposite in the second direction Y are respectively inserted into the grooves 1021. Specifically, one end of the connecting piece 70 in the second direction Y is inserted into the groove 1021 of the second surface 102 of the first liquid cooling plate 10a, and the other end of the connecting piece 70 in the second direction Y is inserted into the groove 1021 of the second surface 102 of the second liquid cooling plate 10b. Referring to FIG. 3, the fixing piece 71 penetrates the mounting hole 611 on the first end wall 61 in the third direction Z and is inserted into the connecting piece 70 to fixedly connect the at least two liquid cooling plates 10 and the first end wall 61. The cooperation of the connecting piece 70 and the fixing piece 71 can fix the two liquid cooling plates 10 adjacent in the second direction Y and the first end wall 61 of the box 60, improve the installation stability between the liquid cooling plate 10 and the box 60, and ensure the heat conduction efficiency between the battery monomers of the liquid cooling plate 10.

[0052] In some embodiments, referring to FIG. 1, the box 60 is internally provided with a support beam 602 extending in the first direction X, and the first liquid cooling plate 10a and the second liquid cooling plate 10b are arranged on both sides of the support beam 602 in the second direction Y.

[0053] In some embodiments, referring to FIG. 3, FIG. 10 and FIG. 17, the connecting piece 70 comprises a body 701 and two protrusions 702, which are spaced apart on one side of the body 701 away from the first end wall 61 in the third direction Z, and are spaced apart along the second direction Y. The body 701 is provided with a fixing hole 703 penetrating the body 701 along the third direction Z. Referring to FIG. 3, the fixing hole 703 communicates with the mounting hole 611 along the third direction Z. The fixing piece 71 is inserted into the mounting hole 611 and the fixing hole 703.

[0054] In some embodiments, the fixing piece 71 is a screw or a bolt.

[0055] In some embodiments, referring to FIG. 4-8, FIG. 11 and FIG. 18-19, the liquid cooling plate 10 further comprises a second blocking piece 17 and a third blocking piece 18. Referring to FIG. 11 and FIG. 12, the third surface 103 of the liquid cooling plate 10 is provided with a plurality of first through holes 1031 communicating with the flow channel 11. Specifically, the first through holes 1031 are spaced apart along the second direction Y. The inlet section 111 and the outlet section 112 of the flow channel 11 respectively communicate with the first through holes 1031. The second gaps 161 adjacent to the third surface 103 in the first direction X respectively communicate with the first through holes 1031. Referring to FIG. 11 and FIG. 13, the fourth surface 104 of the liquid cooling plate 10 is provided with a plurality of second through holes 1041 communicating with the flow channel 11. Specifically, the second through holes 1041 are spaced apart along the second direction Y. The first gaps 151 and the second gaps 161 adjacent to the fourth surface 104 in the first direction X respectively communicate with the second through holes 1041. Referring to FIG. 4-8 and FIG. 11, the second blocking piece 17 is inserted into the first through holes 1031 to block the third surface 103. The third blocking piece 18 is inserted into the second through holes 1041 to block the fourth surface 104. The arrangement of the second blocking piece 17 and the third blocking piece 18 can form blocking of the opposite ends of the liquid cooling plate 10 in the first direction X, thereby ensuring the sealing of the liquid cooling plate 10 and the heat conduction efficiency between the liquid cooling plate 10 and the battery monomer. Moreover, the liquid cooling plate 10 only needs to be inserted with the second blocking piece 17 and the third blocking piece 18 at the two ends after overall forming to realize overall sealing of the liquid cooling plate 10, which is simple in manufacturing process and low in manufacturing cost.

[0056] In some embodiments, the liquid cooling plate 10 is processed and formed by a profile extrusion process. Specifically, the liquid cooling plate 10 is made by an aluminum extrusion profile processing process, which is simple in manufacturing process and low in manufacturing cost. The second blocking piece 17 and the third blocking piece 18 are inserted at the opposite ends of the liquid cooling plate 10 in the first direction X after forming to realize overall sealing of the liquid cooling plate 10.

[0057] In some embodiments, referring to FIG. 18, the second blocking member 17 is provided with a plurality of first blocking portions 171, the second blocking member 17 extends along the second direction Y, and the plurality of first blocking portions 171 are spaced apart along the second direction Y, and the first blocking portions 171 and the first through holes 1031 correspond to each other in number.

[0058] In some embodiments, referring to FIG. 19, the third blocking member 18 is provided with a plurality of second blocking portions 181, the third blocking member 18 extends along the second direction Y, and the plurality of second blocking portions 181 are spaced apart along the second direction Y, and the second blocking portions 181 and the second through holes 1041 correspond to each other in number.

[0059] In some embodiments, referring to FIGS. 4, 6, 9, 14 and 15, the current collector 20 includes a third wall 23 and a fourth wall 24 oppositely arranged along the second direction Y, referring to FIG. 4, the current collector 20 further includes a fourth blocking member 25, referring to FIG. 6, the current collector 20 further includes a fifth blocking member 26, referring to FIG. 14, the third wall 23 is provided with a third through hole 231 communicating with the first chamber 201 and a fourth through hole 232 communicating with the second chamber 202, referring to FIG. 15, the fourth wall 24 is provided with a fifth through hole 241 communicating with the first chamber 201 and a sixth through hole 242 communicating with the second chamber 202, referring to FIG. 4, the fourth blocking member 25 is respectively inserted into the third through hole 231 and the fourth through hole 232, referring to FIG. 6, the fifth blocking member 26 is respectively inserted into the fifth through hole 241 and the sixth through hole 242. The fourth blocking member 25 and the fifth blocking member 26 can form blocking of the opposite ends of the current collector 20 along the second direction Y, ensure the sealing of the current collector 20, and further ensure the sealing between the current collector 20 and the liquid cooling plate 10. Moreover, the fourth blocking member 25 and the fifth blocking member 26 only need to be inserted into the opposite ends of the current collector 20 after the overall forming of the current collector 20, so that the overall sealing of the current collector 20 can be realized, the manufacturing process is simple, and the manufacturing cost is low.

[0060] In some embodiments, the current collector 20 is processed and formed by a profile extrusion process, specifically, the current collector 20 is made by an aluminum extrusion profile processing process, the manufacturing process is simple and the manufacturing cost is low, and the fourth blocking member 25 and the fifth blocking member 26 can be inserted into the opposite ends of the current collector 20 along the second direction Y after the forming of the current collector 20, so that the overall sealing of the current collector 20 can be realized.

[0061] On the other hand, the application also provides a power utilization device including the battery pack as described in any one of the preceding embodiments, and the power utilization device can be an electric vehicle, a power utilization equipment, etc.

[0062] The technical solutions provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A battery pack having a first direction and a third direction that intersect, wherein, The battery pack comprises: A liquid cooling plate, which is internally provided with a flow channel for flowing of a heat conducting medium, the flow channel extends along the first direction, the liquid cooling plate comprises a first face and a second face oppositely arranged along the third direction, the first face is provided with a first liquid inlet and a first liquid outlet which respectively communicate with the flow channel; A current collector, which is arranged on the first face, the current collector is internally provided with a first chamber and a second chamber which are arranged at intervals along the first direction, the current collector comprises a first wall and a second wall which are oppositely arranged along the third direction; The first wall abuts against the first face, the first wall is provided with a second liquid inlet which communicates with the first chamber and a second liquid outlet which communicates with the second chamber, the second liquid inlet communicates with the first liquid inlet, and the second liquid outlet communicates with the first liquid outlet; The second wall is provided with an opening, the first chamber and the second chamber respectively communicate with the opening, the second liquid inlet and the second liquid outlet are oppositely arranged along the third direction with respect to the opening, so as to seal connect the first wall located at the periphery of the second liquid inlet with the first face through the opening, and seal connect the first wall located at the periphery of the second liquid outlet with the first face through the opening; A first plugging member is seal connected to the opening.

2. The battery pack of claim 1, wherein The opening comprises a first opening and a second opening, the first opening communicates with the first chamber, and the second opening communicates with the second chamber; The first opening is oppositely arranged along the third direction with respect to the second liquid inlet, so as to seal connect the first wall located at the periphery of the second liquid inlet with the first face located at the periphery of the first liquid inlet through the first opening; The second opening is oppositely arranged along the third direction with respect to the second liquid outlet, so as to seal connect the first wall located at the periphery of the second liquid outlet with the first face located at the periphery of the first liquid outlet through the second opening.

3. The battery pack of claim 1, wherein, The battery pack further comprises a liquid inlet pipe and a liquid outlet pipe; The second wall is provided with a liquid inlet port which communicates with the first chamber and a liquid outlet port which communicates with the second chamber, the liquid inlet pipe is inserted into the liquid inlet port to provide the heat conducting medium to the first chamber, and the liquid outlet pipe is inserted into the liquid outlet port to discharge the heat conducting medium in the second chamber.

4. The battery pack of claim 3, wherein, The battery pack further has a second direction, the first direction, the second direction and the third direction intersect with each other; The current collector is internally provided with a cavity, the cavity is provided with a first partition plate which extends along the second direction, so as to divide the cavity into the first chamber and the second chamber.

5. The battery pack of claim 3, wherein, The number of the current collectors is two, the two current collectors are arranged at intervals along the first direction on the first face, one of the current collectors is internally provided with the first chamber, and the other of the current collectors is internally provided with the second chamber.

6. The battery pack of claim 1, wherein, The battery pack further has a second direction, the first direction, the second direction and the third direction intersect with each other; The liquid cooling plate comprises a third face and a fourth face which are oppositely arranged along the first direction; The liquid cooling plate is internally provided with at least one second partition plate extending along the first direction, and opposite ends of the second partition plate along the first direction are connected with the third face and the fourth face respectively to form at least two flow channels spaced along the second direction inside the liquid cooling plate.

7. The battery pack of claim 6, wherein, The flow channel is internally provided with a third partition plate extending along the first direction, and one end of the third partition plate along the first direction is connected with the third face, and a first gap exists between the other end of the third partition plate along the first direction and the fourth face. The third partition plate divides the flow channel into a liquid inlet section and a liquid outlet section spaced along the second direction, and the liquid inlet section and the liquid outlet section are communicated through the first gap. The liquid inlet section is communicated with the first liquid inlet, and the liquid outlet section is communicated with the first liquid outlet.

8. The battery pack of claim 7, wherein, The liquid inlet section is internally provided with at least one fourth partition plate extending along the first direction, and second gaps exist between opposite ends of the fourth partition plate along the first direction and the third face and the fourth face respectively, and the fourth partition plate divides the liquid inlet section into at least two liquid inlet flow channels spaced along the second direction, and the at least two liquid inlet flow channels are communicated through the second gaps.

9. The battery pack of claim 7, wherein, The liquid outlet section is internally provided with at least one fourth partition plate extending along the first direction, and second gaps exist between opposite ends of the fourth partition plate along the first direction and the third face and the fourth face respectively, and the fourth partition plate divides the liquid outlet section into at least two liquid outlet flow channels spaced along the second direction, and the at least two liquid outlet flow channels are communicated through the second gaps.

10. The battery pack of claim 7, wherein, The liquid inlet section is internally provided with at least one fourth partition plate extending along the first direction, and second gaps exist between opposite ends of the fourth partition plate along the first direction and the third face and the fourth face respectively, and the fourth partition plate divides the liquid inlet section into at least two liquid inlet flow channels spaced along the second direction, and the at least two liquid inlet flow channels are communicated through the second gaps. The liquid outlet section is internally provided with at least one fourth partition plate extending along the first direction, and second gaps exist between opposite ends of the fourth partition plate along the first direction and the third face and the fourth face respectively, and the fourth partition plate divides the liquid outlet section into at least two liquid outlet flow channels spaced along the second direction, and the at least two liquid outlet flow channels are communicated through the second gaps.

11. The battery pack of claim 1, wherein, The battery pack also has a second direction, and the first direction, the second direction and the third direction intersect with each other; The battery pack further comprises a box, a connecting piece and a fixing piece, the box is internally provided with a receiving cavity, the box comprises a first end wall and a second end wall oppositely arranged along the third direction, and a mounting hole penetrating through the first end wall along the third direction is formed in the first end wall; The liquid cooling plate is arranged in the receiving cavity, and the liquid cooling plate and the first end wall are spaced along the third direction. The number of the liquid cooling plates is at least two, and the at least two liquid cooling plates are arranged at intervals along the second direction, and the second surfaces of the at least two liquid cooling plates are respectively provided with grooves on the two adjacent sides along the second direction; The connecting piece is arranged between the first end wall and the liquid cooling plate, and opposite ends of the connecting piece are respectively inserted into the grooves along the second direction, and the fixing piece penetrates through the mounting hole along the third direction and is inserted into the connecting piece to fixedly connect the at least two liquid cooling plates and the first end wall.

12. The battery pack of claim 11, wherein, The connecting piece comprises a body and two protruding portions, and the two protruding portions are arranged at intervals on a surface of the body away from the first end wall along the third direction, and the two protruding portions are arranged at intervals along the second direction, and the protruding portions are inserted into the grooves; The body is provided with a fixing hole penetrating through the body along the third direction, and the fixing hole is in communication with the mounting hole along the third direction, and the fixing piece is inserted into the mounting hole and the fixing hole.

13. The battery pack of claim 1, wherein, The liquid cooling plate further comprises a second blocking piece and a third blocking piece; The liquid cooling plate comprises a third surface and a fourth surface arranged opposite along the first direction, the third surface is provided with a first through hole in communication with the flow channel, and the fourth surface is provided with a second through hole in communication with the flow channel; The second blocking piece is inserted into the first through hole to block the third surface, and the third blocking piece is inserted into the second through hole to block the fourth surface.

14. The battery pack of claim 1, wherein, The battery pack further has a second direction, and the first direction, the second direction and the third direction intersect with each other; The current collecting piece comprises a third wall and a fourth wall arranged opposite along the second direction, and further comprises a fourth blocking piece and a fifth blocking piece; The third wall is provided with a third through hole in communication with the first chamber and a fourth through hole in communication with the second chamber, and the fourth wall is provided with a fifth through hole in communication with the first chamber and a sixth through hole in communication with the second chamber; The fourth blocking piece is respectively inserted into the third through hole and the fourth through hole, and the fifth blocking piece is respectively inserted into the fifth through hole and the sixth through hole.

15. An electrical device, comprising: The battery pack comprises the battery pack according to any one of claims 1-14.

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