Liquid-cooled battery pack and vehicle

Abstract

The application provides a liquid-cooled battery pack and a vehicle, and relates to the technical field of batteries. According to the liquid-cooled battery pack provided by the application, the refrigerant flows from a liquid cooling plate to a current collecting plate, and then flows from the current collecting plate to a heat dissipation plate. The cooling of the refrigerant in the liquid cooling plate is compensated by a cold energy compensation assembly at the current collecting plate, so that the refrigerant that has exchanged heat with the battery cells in the liquid cooling plate is cooled again in the current collecting plate. Therefore, when the refrigerant flows to the corresponding heat dissipation plate, the temperature of the refrigerant is not high, the heat exchange between the refrigerant and the battery cells is not poor, and the cooling of the battery cells is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a liquid-cooled battery pack and a vehicle. BACKGROUND

[0002] The power battery is a key component of a new energy vehicle, which stores electric energy and provides kinetic energy for the electric vehicle. The power battery is usually composed of a battery pack composed of multiple battery units. The battery unit contains positive material, negative material, electrolyte, separator and current collector and other components. The power battery, as one of the core components of the electric vehicle, is the energy center of the electric vehicle and plays an irreplaceable role in the vehicle.

[0003] The common heat dissipation method of the existing power battery mainly uses a heat dissipation plate or other medium to isolate the battery and the cooling water. The cooling water flows in the heat dissipation plate, and the heat is taken away by heat conduction and convection. This method is feasible in principle, but since the power battery is composed of multiple battery units, when the cooling water enters the battery through the cooling system, the cooling water will gradually heat up in the heat dissipation plate due to heat conduction. When the cooling water flows to the heat dissipation plate near the discharge position, the temperature of the cooling water is already high, and the cooling effect on the battery units near the position is insufficient, resulting in uneven temperature distribution of the components in the battery. Uneven temperature distribution of the power battery will on the one hand lead to performance degradation such as battery capacity and cycle life, and on the other hand will increase the safety hazards such as overcharge and overdischarge of the battery, directly affecting the safety and service life of the vehicle. SUMMARY

[0004] Therefore, the present application provides a liquid-cooled battery pack and a vehicle, which aims to solve the above technical problems to some extent.

[0005] The first aspect of the present application provides a liquid-cooled battery pack, which comprises:

[0006] a plurality of battery units, the plurality of battery units are arranged as a plurality of battery unit columns, each of the battery unit columns is arranged along a first direction, and the plurality of battery units are arranged in a second direction intersecting the first direction;

[0007] a liquid cooling plate, the liquid cooling plate is arranged on one side of the plurality of battery units in a third direction, the third direction intersects the first direction and the second direction;

[0008] wherein the liquid-cooled battery pack further comprises a current collecting plate configured for each pair of adjacent battery unit columns, the current collecting plate is arranged between the corresponding adjacent battery unit columns, and the current collecting plate is in communication with the liquid cooling plate;

[0009] The liquid-cooled battery pack further comprises a plurality of heat dissipation plates configured for each of the battery cell columns, each of the heat dissipation plates is arranged between adjacent battery cells in the first direction, and each of the heat dissipation plates is in communication with the current collecting plates adjacent in the second direction.

[0010] The liquid-cooled battery pack further comprises a cold compensation assembly connected with the current collecting plates, the current collecting plates are used to flow the refrigerant delivered by the liquid-cooled plates and deliver the refrigerant to the heat dissipation plates in communication with the current collecting plates, and the cold compensation assembly is used to exchange heat with the refrigerant in the current collecting plates to cool the refrigerant in the current collecting plates.

[0011] On the basis of the above technical solutions, the cold compensation assembly comprises:

[0012] A heat-conducting element is arranged in the current collecting plate along the first direction, and a part of the heat-conducting element is exposed to the outside of the current collecting plate.

[0013] A cooling element is in contact with the part of the heat-conducting element to cool the part of the heat-conducting element.

[0014] On the basis of any one of the above technical solutions, the current collecting plate has a current collecting flow channel, and the current collecting flow channel comprises:

[0015] A first flow channel extends along a third direction.

[0016] A plurality of second flow channels, a part of the plurality of second flow channels are located on one side of the first flow channel in the second direction and are sequentially in communication, and another part of the plurality of second flow channels are located on the other side of the first flow channel in the second direction and are sequentially in communication, each of the second flow channels extends along the third direction, and each of the second flow channels is used to receive the refrigerant delivered from the first flow channel.

[0017] The cold compensation assembly is used to cool the refrigerant in the first flow channel.

[0018] On the basis of any one of the above technical solutions, the cold compensation assembly comprises:

[0019] A heat-conducting element is arranged in the first flow channel along the first direction, and a part of the heat-conducting element is exposed to the outside of the current collecting plate.

[0020] A cooling element is in contact with the part of the heat-conducting element to cool the part of the heat-conducting element.

[0021] On the basis of any of the preceding technical solutions, optionally, the first flow channel has a flow channel inlet located on one side of the first flow channel in the third direction, and the heat conduction element is directly opposite the flow channel inlet to divide the refrigerant entering the first flow channel through the flow channel inlet.

[0022] On the basis of any of the preceding technical solutions, optionally, the heat dissipation plate comprises a plurality of sub-flow channels arranged along the first direction and sequentially connected, and the adjacent sub-flow channels have an air gap therebetween.

[0023] On the basis of any of the preceding technical solutions, optionally, the liquid-cooled battery pack further comprises a protective shell and a protective top cover detachably connected to each other, the plurality of battery cells, the liquid-cooled plate, the current collecting plate, and the plurality of heat dissipation plates are arranged in a space defined by the protective shell and the protective top cover,

[0024] The liquid-cooled battery pack further comprises a sealing gasket arranged between the protective shell and the protective top cover to seal a gap between the protective shell and the protective top cover.

[0025] On the basis of any of the preceding technical solutions, optionally, the liquid-cooled battery pack further comprises an elastic frame arranged outside the plurality of battery cells and between the plurality of battery cells and the protective shell, and further comprises an insulating protective plate arranged between the protective top cover and the plurality of battery cells.

[0026] On the basis of any of the preceding technical solutions, optionally, the elastic frame has an elastic protrusion on an inner side of the elastic frame, and the elastic protrusion is inserted between adjacent single battery cells in a battery cell column adjacent to the elastic frame.

[0027] The second aspect of the present application provides a vehicle comprising the liquid-cooled battery pack as described above.

[0028] According to the liquid-cooled battery pack provided by the present application, the refrigerant flows from the liquid-cooled plate to the current collecting plate, and then flows from the current collecting plate to the heat dissipation plate, and is cooled again in the current collecting plate by the cooling compensation assembly, so that the refrigerant that has exchanged heat with the battery cells in the liquid-cooled plate is cooled again in the current collecting plate, and thus does not have a high temperature when flowing to the corresponding heat dissipation plate, which causes poor heat exchange with the battery cells and uneven cooling of the battery cells.

[0029] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 A schematic diagram showing a three-dimensional view of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0032] Figure 2 A schematic diagram showing an exploded view of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0033] Figure 3 A schematic diagram showing a cross-sectional view of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0034] Figure 4 A schematic diagram showing Figure 3 A schematic diagram showing an enlarged view at A in the middle.

[0035] Figure 5 A schematic diagram showing a three-dimensional view of a cooling-related structure of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0036] Figure 6 A schematic diagram showing an exploded view of a cooling-related structure of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0037] Figure 7 A schematic diagram showing a three-dimensional view of a current collecting plate of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0038] Figure 8 A schematic diagram showing a three-dimensional view of a heat dissipation plate of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0039] Figure 9 A schematic diagram showing a cross-sectional view of a current collecting plate of a liquid-cooled battery pack according to an embodiment of the present application is shown.

[0040] Reference signs:

[0041] 1 - protective shell; 2 - protective top cover; 201 - insulating protective plate; 202 - wire harness hole; 3 - heat dissipation bottom plate; 301 - positioning and placing groove; 302 - first water outlet; 303 - first water inlet; 4 - battery unit; 5 - water inlet interface; 6 - heat dissipation water collecting plate; 601 - second water inlet; 602 - second water outlet; 603 - partition plate; 7 - rubber sealing ring; 8 - sealing tube; 9 - copper tube; 10 - copper plate; 11 - semiconductor refrigerator; 12 - lateral heat dissipation plate; 13 - backwater pipe; 14 - sealing washer; 15 - fastening bolt; 16 - rectangular foam frame; 17 - foam protrusion; 18 - mounting hanger; 19 - hoisting hole. DETAILED DESCRIPTION

[0042] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0046] According to the embodiments of the present application, a liquid-cooled battery pack is provided, and the structure and working principle of the liquid-cooled battery pack will be described in detail below with reference to the drawings.

[0047] The liquid-cooled battery pack provided by the embodiment of the present application comprises a plurality of battery cells, a liquid-cooled plate, a current collecting plate, and a plurality of heat dissipation plates.

[0048] In the embodiment, the plurality of battery cells are arranged as a plurality of battery cell columns, each battery cell column is arranged along a first direction, and the plurality of battery cells are arranged at intervals along a second direction intersecting the first direction. In the embodiment, the liquid-cooled plate is arranged on one side of the plurality of battery cells in a third direction, and the third direction intersects the first direction and the second direction.

[0049] In the embodiment, the liquid-cooled battery pack further comprises a current collecting plate configured for each pair of adjacent battery cell columns, the current collecting plate is arranged between the corresponding adjacent battery cell columns, and the current collecting plate is in communication with the liquid-cooled plate.

[0050] In the embodiment, the liquid-cooled battery pack further comprises a plurality of heat dissipation plates configured for each battery cell column, each heat dissipation plate is arranged between adjacent battery cells in the first direction, and each heat dissipation plate is in communication with adjacent current collecting plates in the second direction.

[0051] In the embodiment, the liquid-cooled battery pack further comprises a cold quantity compensation assembly connected to the current collecting plate, the current collecting plate is used to circulate the refrigerant delivered by the liquid-cooled plate and deliver the refrigerant to the heat dissipation plates in communication with the current collecting plate, and the cold quantity compensation assembly is used to exchange heat with the refrigerant in the current collecting plate to cool the refrigerant in the current collecting plate.

[0052] In this way, according to the liquid-cooled battery pack provided by the embodiment of the present application, the refrigerant flows from the liquid-cooled plate to the current collecting plate, and then flows from the current collecting plate to the heat dissipation plates, and the refrigerant that has exchanged heat with the battery cells in the liquid-cooled plate is cooled again in the current collecting plate through the cooling of the cold quantity compensation assembly, so that when the refrigerant flows to the corresponding heat dissipation plates, the temperature of the refrigerant is not too high, which can cause poor heat exchange with the battery cells and further cause uneven cooling of the battery cells.

[0053] In the embodiment, as an example, the first direction may, for example, be the length direction of the battery pack, the second direction may, for example, be the width direction of the battery pack, and the third direction may, for example, be the height direction of the battery pack. In other words, the first direction, the second direction, and the third direction may be perpendicular to each other.

[0054] According to the liquid-cooled battery pack provided by the embodiment of the present application, the cold quantity compensation assembly can comprise a heat-conducting element and a cooling element. In the embodiment, the heat-conducting element is arranged in the current collecting plate along the first direction, and part of the heat-conducting element is exposed to the outside of the current collecting plate, and the cooling element can be in contact with the part of the heat-conducting element to cool the part of the heat-conducting element.

[0055] Thus, according to the liquid-cooled battery pack provided in the embodiments of the present application, the heat-conducting element is directly arranged in the current collecting plate, so that a part of the heat-conducting element can be directly in contact with the coolant inside the current collecting plate, thereby improving the cooling efficiency of the heat-conducting element on the coolant. In the embodiments, the cooling element provides cooling capacity for the heat-conducting element.

[0056] According to the liquid-cooled battery pack provided in the embodiments of the present application, the current collecting plate can have a current collecting flow channel, and the current collecting flow channel can include a first flow channel and a plurality of second flow channels. In the embodiments, the first flow channel can extend along a third direction, a part of the plurality of second flow channels can be located on one side of the first flow channel in a second direction and sequentially communicate with each other, another part of the plurality of second flow channels can be located on the other side of the first flow channel in the second direction and sequentially communicate with each other, each second flow channel can extend along the third direction, and each second flow channel can be used to receive the coolant delivered from the first flow channel. In the embodiments, the cooling capacity compensation assembly is used to cool the coolant in the first flow channel.

[0057] Thus, according to the liquid-cooled battery pack provided in the embodiments of the present application, the first flow channel corresponds to the total flow channel, and the cooling capacity compensation assembly cooling the coolant in the first flow channel is conducive to distributing the cooled coolant to the second flow channels as branch flow channels, thereby ensuring that the coolant in the current collecting plate is sufficiently cooled.

[0058] Therefore, in the embodiments, the heat-conducting element mentioned in the above description can be arranged in the first flow channel along the first direction, thereby directly contacting the coolant in the first flow channel.

[0059] According to the liquid-cooled battery pack provided in the embodiments of the present application, the first flow channel can have a flow channel inlet located on one side of the first flow channel in the third direction, and the heat-conducting element can be opposite to the flow channel inlet to distribute the coolant entering the first flow channel through the flow channel inlet.

[0060] Thus, according to the liquid-cooled battery pack provided in the embodiments of the present application, the heat-conducting element not only plays a role in cooling the coolant inside the first flow channel, but also directly plays a role in distributing the coolant in the first flow channel, thereby providing a more complex path for the flow of the coolant and increasing the heat exchange time of the coolant with the heat-conducting element.

[0061] In other words, in the embodiments, the heat-conducting element itself can have a relatively high height, for example, a partition plate 603 mentioned in the following description can be arranged inside the current collecting plate to divide the space inside the current collecting plate into the first flow channel and the second flow channel as described above. Here, the height of the heat-conducting element (i.e., the copper pipe 9 mentioned in the subsequent description) can be slightly less than the height of the partition plate 603.

[0062] In an embodiment, the heat-conducting element can be, for example, a U-shaped tube, which means that, for one heat-conducting element, the refrigerant on both sides of the U-shaped tube in the width direction of the battery pack is not completely isolated, but can exchange, starting from the refrigerant shunting below the heat-conducting element and ending with the refrigerant shunting above the heat-conducting element.

[0063] Specifically, after the U-shaped tube shunts the refrigerant below, the refrigerant exchanges with each other after being divided into two streams through the middle region of the U-shaped tube, so that, on the one hand, the refrigerant accelerates when flowing through the surface of the lower side of the U-shaped tube after being shunted, and then quickly flows upward, and then converges the refrigerant on both sides under acceleration. Since the refrigerants on both sides converge under the condition of increasing initial velocity, the refrigerants on both sides of the middle region of the U-shaped tube are fully mixed and the flow resistance is increased, thereby increasing the heat exchange time between the refrigerant and the U-shaped tube.

[0064] Then, the refrigerant continues to be shunted on the upper side of the U-shaped tube. Because the flow space of the refrigerant is larger before the shunting position on the upper side, the shunting on the upper side increases the flow rate of the refrigerant on both sides, so that the refrigerant quickly "turns around" and flows into the second flow channel under the condition that the first flow channel and the second flow channel are arranged side by side, thereby avoiding the loss of refrigerant speed due to the arrangement position of the first flow channel and the second flow channel, and also facilitating the avoidance of the accumulation of deposits at the intersection of the first flow channel and the second flow channel due to the loss of refrigerant speed.

[0065] According to the liquid-cooled battery pack provided by the embodiment of the present application, the heat dissipation plate can include a plurality of sub-flow channels, and the plurality of sub-flow channels are arranged along the first direction and are sequentially connected, and the adjacent sub-flow channels have air gaps therebetween. In this way, the heat dissipation plate can effectively provide cooling for the battery cells through the contact between the sub-flow channels and the adjacent battery cells, and the air gaps between the sub-flow channels are also conducive to the heat dissipation of the heat dissipation plate to the outside.

[0066] According to the liquid-cooled battery pack provided by the embodiment of the present application, the liquid-cooled battery pack can further include a protective shell and a protective top cover which are detachably connected to each other, and the plurality of battery cells, the liquid cooling plate, the current collecting plate, and the plurality of heat dissipation plates can be arranged in a space defined by the protective shell and the protective top cover.

[0067] In an embodiment, the liquid-cooled battery pack can further include a sealing gasket arranged between the protective shell and the protective top cover to seal the gap between the protective shell and the protective top cover.

[0068] According to the liquid-cooled battery pack provided by the embodiment of the present application, the liquid-cooled battery pack can further include an elastic frame body which can be arranged outside the plurality of battery cells and between the plurality of battery cells and the protective shell, and the liquid-cooled battery pack can further include an insulating protective plate arranged between the protective top cover and the plurality of battery cells.

[0069] According to the liquid-cooled battery pack provided in the embodiment of the present application, the inner side of the elastic frame body can have elastic protrusions which can be inserted between adjacent single batteries in the battery cell column adjacent to the elastic frame body to form a buffer protection for the adjacent single batteries.

[0070] The embodiment of the present application aims to provide a water-cooling structure integrated in a power battery, which performs one cooling of the cooling water during circulation of the cooling water in the water-cooling structure in the power battery, so as to avoid the phenomenon of uneven cooling of the battery cells due to gradual increase of the temperature of the cooling water.

[0071] The specific example implementation manner of the embodiment of the present application is as follows. The inside of the protective shell 1 is provided with a heat dissipation bottom plate 3, a plurality of battery cells 4 are fixedly adhered to the top surface of the heat dissipation bottom plate 3 inside the protective shell 1, a water inlet interface 5 is inserted at the input end of the heat dissipation bottom plate 3, the fastening bolt 15 is used to detachably and fixedly install the protective shell 1 and the protective top cover 2, and the protective shell 1 and the protective top cover 2 are used to protect the plurality of battery cells 4 inside the protective shell 1.

[0072] In the embodiment, the top surface of the heat dissipation bottom plate 3 is provided with a heat dissipation water collecting plate 6, and a rubber sealing ring 7 is pressed and combined at the connection position of the heat dissipation bottom plate 3 and the heat dissipation water collecting plate 6, so as to seal the connection position of the heat dissipation bottom plate 3 and the heat dissipation water collecting plate 6 and avoid leakage of the cooling water during circulation. In the embodiment, the heat dissipation water collecting plate 6 is provided with a sealing pipe 8 at each end, and the output ends of the two sides of the heat dissipation water collecting plate 6 are connected with lateral heat dissipation plates 12, the lateral heat dissipation plates 12 have an I-shaped structure and are in close contact with the surfaces of the battery cells 4 inside the protective shell 1.

[0073] In the embodiment, the inside of the sealing pipe 8 is inserted with a copper pipe 9, the heat dissipation water collecting plate 6 is fixedly provided with two groups of partition plates 603, there is a gap with a certain height between the top surfaces of the two groups of partition plates 603 and the inner top surface of the heat dissipation water collecting plate 6, the copper pipe 9 is located inside the heat dissipation water collecting plate 6 and between the two groups of partition plates 603, so as to guide the flow direction of the cooling water through the two groups of partition plates 603, the end of the copper pipe 9 is fixedly provided with a copper plate 10, and the end surface of the copper plate 10 is fixedly provided with a semiconductor refrigerator 11. The refrigeration end of the semiconductor refrigerator 11 is in close contact with the copper plate 10, the output ends of the plurality of lateral heat dissipation plates 12 are fixedly connected with a backwater pipe 13, and the backwater pipe 13 penetrates through the protective shell 1 and extends to the outside.

[0074] In the embodiment, the battery cells 4 are placed equidistantly on the heat dissipation base plate 3, the surfaces of the battery cells 4 are respectively fitted with the top surface of the heat dissipation base plate 3, the surface of the heat dissipation water collecting plate 6 and the surface of the lateral heat dissipation plate 12, the cooling water is connected with the water cooling system of the power battery through the water inlet interface 5, enters into the heat dissipation base plate 3 and then enters into the heat dissipation water collecting plate 6, and then flows into the lateral heat dissipation plate 12, and finally is discharged through the water return pipe 13 to return to the water cooling system, so as to realize the circulating flow of the cooling water.

[0075] In the embodiment, the two groups of partitions 603 in the inner wall of the heat dissipation water collecting plate 6 form a water collecting and containing cavity in the heat dissipation water collecting plate 6, the copper pipe 9 in the heat dissipation water collecting plate 6 is in contact with the cooling water flowing in the heat dissipation water collecting plate 6, and the copper plate 10 and the copper pipe 9 are cooled by the semiconductor refrigerator 11. Since the copper plate 10 and the copper pipe 9 are both made of copper, they have high thermal conductivity, so the cooling water flowing in the heat dissipation water collecting plate 6 can be cooled by the copper pipe 9, thereby avoiding the phenomenon that the battery cells 4 are not uniformly cooled due to the gradual increase of the temperature of the cooling water when the cooling water circulates.

[0076] In the embodiment, the sealing gasket 14 is placed on the top surface of the protective shell 1 between the protective shell 1 and the protective top cover 2, so as to seal the gap between the protective shell 1 and the protective top cover 2 after the protective shell 1 and the protective top cover 2 are fixed by the fastening bolt 15. The mounting hanger 18 is welded to the surface of the protective shell 1, and the hoisting hole 19 is formed in the surface of the mounting hanger 18, and the cross section of the mounting hanger 18 is in U-shaped structure.

[0077] In the embodiment, when the protective shell 1 and the protective top cover 2 are fixed, the sealing gasket 14 is fitted on the top surface of the protective shell 1, the through hole formed in the surface of the sealing gasket 14 corresponds to the mounting hole of the protective shell 1 and the protective top cover 2, and the sealing gasket 14 is in compressed state after the protective shell 1 and the protective top cover 2 are fixed by the fastening bolt 15. The sealing gasket 14 seals the gap between the protective shell 1 and the protective top cover 2, improves the sealing performance of the interior of the protective shell 1, avoids the dust and impurities and water from the outside entering into the interior of the protective shell 1, improves the safety of the battery cells 4 in the interior of the protective shell 1, and the mounting hanger 18 can be connected and fixed with the new energy vehicle through the hoisting hole 19 in the surface of the mounting hanger 18.

[0078] The bottom surface of the protective shell 1 is provided with a mounting groove, and an insulating protective plate 201 is fixedly attached in the mounting groove. When the protective shell 1 is fixedly installed on the top surface of the protective top cover 2, the bottom surface of the insulating protective plate 201 is tightly attached to the top surface of the plurality of battery units 4 in the protective shell 1. The insulating protective plate 201 is made of compressible material. The surface of the protective shell 1 is provided with a wire harness hole 202 to assist the high-voltage wire to enter the interior of the protective shell 1. When the protective shell 1 and the protective top cover 2 are fixedly installed, the bottom surface of the protective shell 1 is fixedly attached to the insulating protective plate 201, which is attached to the top surface of the plurality of battery units 4 in the protective shell 1. The insulating protective plate 201 is made of compressible material such as rubber or foam, which can form a buffer barrier between the battery units 4 and the protective shell 1 to improve the safety of the battery units 4. The wire harness hole 202 on the surface of the protective top cover 2 assists the high-voltage wire to enter the interior of the protective shell 1 and connect with the battery units 4 in the interior of the protective shell 1.

[0079] In the embodiment, the top of the heat dissipation bottom plate 3 is provided with a plurality of groups of positioning and placing grooves 301 arranged symmetrically to position and place the battery units 4 during installation. The end surface of the heat dissipation bottom plate 3 is provided with at least one group of first water outlets 302, and the water inlet interface 5 is installed in the first water outlet 302. The top surface of the heat dissipation bottom plate 3 is linearly arranged with a plurality of groups of first water inlets 303 at the center, and the interior of the heat dissipation bottom plate 3 can be vertically installed with a plurality of groups of equally spaced reinforcing plates.

[0080] In the embodiment, the heat dissipation bottom plate 3 is made of metal material, preferably copper. The water inlet interface 5 is fixedly installed in the two groups of first water outlets 302 on the end surface of the heat dissipation bottom plate 3. The heat dissipation bottom plate 3 is connected to the pipeline of the water cooling system through the water inlet interface 5. The plurality of positioning and placing grooves 301 on the top surface of the heat dissipation bottom plate 3 can position and place the battery units 4 in the interior of the protective shell 1. In the embodiment, the bottom surface of the battery unit 4 can be fixed in the positioning and placing groove 301 by a colloid. The plurality of vertical reinforcing plates on the inner wall of the heat dissipation bottom plate 3 can improve the structural strength of the cavity of the heat dissipation bottom plate 3 and improve its compression load capacity.

[0081] In the embodiment, the bottom surface of the heat dissipation and water collecting plate 6 is provided with a recess corresponding to the first water inlet 303, and the second water inlet 601 is fixedly installed in the recess. When the heat dissipation and water collecting plate 6 and the heat dissipation bottom plate 3 are installed, the second water inlet 601 is fixedly inserted with the first water inlet 303. The rubber sealing ring 7 is fixedly sleeved on the surface of the second water inlet 601. The two side walls of the heat dissipation and water collecting plate 6 are equally provided with a plurality of groups of second water outlets 602, and the heat dissipation and water collecting plate 6 is made of copper.

[0082] In the embodiment, the second water inlet 601 at the bottom of the heat dissipation water collecting plate 6 is fixedly connected with the first water inlet 303 at the top of the heat dissipation bottom plate 3, so that the rubber sealing ring 7 is compressed, the rubber sealing ring 7 is sleeved on the surface of the second water inlet 601, and the connection between the second water inlet 601 and the first water inlet 303 is sealed through the rubber sealing ring 7, the output end of the lateral heat dissipation plate 12 is inserted into the second water outlet 602 of the two side walls of the heat dissipation water collecting plate 6, and the lateral heat dissipation plate 12 is connected with the heat dissipation water collecting plate 6 in communication, wherein the inlet part and the outlet part of the lateral heat dissipation plate 12 are staggered, so that the flow and circulation of the cooling water in the lateral heat dissipation plate 12 can be realized.

[0083] The inner wall of the protective shell 1 is fixedly connected with at least two groups of rectangular foam frames 16, and a plurality of groups of foam protrusions 17 are equidistantly arranged at the inner edges of the front and rear sides of the rectangular foam frame 16, and the plurality of groups of foam protrusions 17 are respectively located between the two groups of battery units 4, and the foam protrusions 17 are tightly connected with the surfaces of the battery units 4. The rectangular foam frame 16 and the foam protrusion 17 are made of hard foam material to separate the battery units 4, the protective shell 1 and the battery units 4.

[0084] In the embodiment, the rectangular foam frame 16 fixedly connected with the inner wall of the protective shell 1 separates the battery units 4 and the protective shell 1, the foam protrusions 17 at the inner edges of the rectangular foam frame 16 are located between the two groups of battery units 4 to separate the two groups of battery units 4, and the rectangular foam frame 16 and the foam protrusions 17 support the gaps between the battery units 4, the battery units 4 and the protective shell 1, and form a buffer isolation line to support and protect while separating.

[0085] According to the second aspect of the embodiment of the application, a vehicle is provided, which comprises the liquid-cooled battery pack as above, and has the beneficial effects as above, which will not be repeated here. The vehicle can be a new energy vehicle, and the battery pack can be a power battery pack for example. At least part of the power of the vehicle is provided by the battery pack.

[0086] The above is only the preferred embodiment of the application, and does not limit the protection scope of the application. Any equivalent structural transformation made by using the content of the application specification and drawings, or direct / indirect application in other related technical fields under the innovative concept of the application is included in the protection scope of the application.

Claims

1. A liquid-cooled battery pack, characterized by, The liquid-cooled battery pack comprises: a plurality of battery cells arranged as a plurality of battery cell columns, each of the battery cell columns being arranged along a first direction, the plurality of battery cells being spaced apart along a second direction intersecting the first direction; a liquid-cooled plate arranged on one side of the plurality of battery cells in a third direction, the third direction intersecting the first direction and the second direction; wherein the liquid-cooled battery pack further comprises a current collecting plate configured for each pair of adjacent battery cell columns, the current collecting plate being arranged between the corresponding adjacent battery cell columns, the current collecting plate being in communication with the liquid-cooled plate; wherein the liquid-cooled battery pack further comprises a plurality of heat dissipation plates configured for each battery cell column, each of the heat dissipation plates being arranged between adjacent battery cells in the first direction, each of the heat dissipation plates being in communication with adjacent current collecting plates in the second direction; wherein the liquid-cooled battery pack further comprises a cold compensation assembly connected to the current collecting plate, the current collecting plate being configured to flow cooling water delivered by the liquid-cooled plate and deliver the cooling water to the heat dissipation plates in communication with the current collecting plate, the cold compensation assembly being configured to exchange heat with the cooling water in the current collecting plate to cool the cooling water in the current collecting plate; the cold compensation assembly comprises: a heat-conducting element penetrating the current collecting plate along the first direction, a portion of the heat-conducting element being exposed to the outside of the current collecting plate, the heat-conducting element being a U-shaped tube; a cooling element in contact with the portion of the heat-conducting element to cool the portion of the heat-conducting element.

2. The liquid-cooled battery pack of claim 1, wherein, The current collecting plate has a current collecting flow channel, the current collecting flow channel comprising: a first flow channel extending along a third direction; a plurality of second flow channels, a part of the plurality of second flow channels being located on one side of the first flow channel in the second direction and sequentially communicating, another part of the plurality of second flow channels being located on the other side of the first flow channel in the second direction and sequentially communicating, each of the second flow channels extending along the third direction, each of the second flow channels being configured to receive cooling water delivered from the first flow channel; wherein the cold compensation assembly is configured to cool the cooling water in the first flow channel.

3. The liquid-cooled battery pack of claim 2, wherein, The first flow channel has a flow channel inlet located on one side of the first flow channel in the third direction, the heat-conducting element being directly opposite the flow channel inlet to divide the cooling water entering the first flow channel through the flow channel inlet.

4. The liquid-cooled battery pack of claim 1, wherein, The heat dissipation plate comprises a plurality of sub-flow channels arranged along the first direction and sequentially communicating, adjacent sub-flow channels having an air gap therebetween.

5. The liquid-cooled battery pack of claim 1, wherein, The liquid-cooled battery pack further comprises a protective shell and a protective top cover detachably connected to each other, the plurality of battery cells, the liquid-cooled plate, the current collecting plate, and the plurality of heat dissipation plates being arranged in a space defined by the protective shell and the protective top cover, The liquid-cooled battery pack further comprises a sealing gasket arranged between the protective shell and the protective top cover to seal the gap between the protective shell and the protective top cover.

6. The liquid-cooled battery pack of claim 5, wherein, The liquid-cooled battery pack further comprises an elastic frame body arranged outside the plurality of battery cells and between the plurality of battery cells and the protective shell, and further comprises an insulating protective plate arranged between the protective top cover and the plurality of battery cells.

7. The liquid-cooled battery pack of claim 6, wherein, An inner side of the elastic frame body is provided with elastic protrusions inserted between adjacent single battery cells in the battery cell column adjacent to the elastic frame body.

8. A vehicle characterized by comprising: The vehicle comprises the liquid-cooled battery pack according to any one of claims 1 to 7.

Images