Liquid-cooled battery pack and vehicle

Abstract

The invention 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 invention, a refrigerant flows to the collector plate from the liquid-cooled plate and then flows to the heat dissipation plate from the collector plate, and the refrigerant which exchanges heat with the battery unit in the liquid-cooled plate is cooled again in the collector plate through cooling of the cooling capacity compensation assembly at the collector plate; therefore, when the refrigerants flow to the corresponding heat dissipation plates, poor heat exchange between the refrigerants and the battery units due to high temperature is avoided, and uneven cooling of the battery units is avoided.

Description

Technical Field

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

[0002] Power batteries are key components of new energy vehicles. They are responsible for storing electrical energy and providing kinetic energy for electric vehicles. Power batteries are usually composed of a battery pack consisting of multiple battery cells. The battery cells contain components such as positive electrode materials, negative electrode materials, electrolytes, diaphragms and current collectors. As one of the core components of electric vehicles, power batteries are the energy center of electric vehicles and play an irreplaceable role in the entire vehicle.

[0003] The common heat dissipation method of existing power batteries mainly uses heat sinks or other media to isolate the battery and cooling water, relying on the cooling water to flow in the heat sink to carry away the heat through heat conduction and convection. This method is feasible in principle, but because the power battery is composed of multiple battery cells, when the cooling water enters the battery through the cooling system, the cooling water will gradually heat up in the heat sink as heat conduction works. This results in the temperature of the cooling water being relatively high when it flows to the heat sink near the discharge position, and the cooling effect on the battery cells near this position is insufficient, resulting in uneven temperature distribution of components in the battery. The uneven temperature distribution of the power battery will, on the one hand, lead to a decrease in battery capacity, cycle life and other performance, and on the other hand, it will increase safety hazards such as overcharging and over-discharging of the battery, directly affecting the safety and service life of the vehicle. Summary of the invention

[0004] In view of this, the present application provides a liquid-cooled battery pack and a vehicle, the purpose of which is to solve the above technical problems to a certain extent.

[0005] A first aspect of the present application provides a liquid-cooled battery pack, the liquid-cooled battery pack comprising: A plurality of battery cells, wherein the plurality of battery cells are arranged into a plurality of battery cell columns, each of the battery cell columns is arranged along a first direction, and the plurality of battery cells are arranged at intervals along a second direction intersecting the first direction; a liquid cooling plate, the liquid cooling plate being arranged on one side of the plurality of battery cells in a third direction, wherein the third direction intersects with the first direction and the second direction in pairs; Wherein, the liquid-cooled battery pack further includes 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 connected to the liquid cooling plate; The liquid-cooled battery pack further comprises a plurality of heat sinks configured for each battery cell column, each heat sink is disposed between battery cells adjacent in the first direction, and each heat sink is connected to a current collecting plate adjacent in the second direction; Among them, the liquid-cooled battery pack also includes a cold capacity compensation component, which is connected to the collecting plate. The collecting plate is used to circulate the refrigerant transported by the liquid cooling plate and transport the refrigerant to the heat sink connected to the collecting plate. The cold capacity compensation component is used to exchange heat with the refrigerant in the collecting plate to cool the refrigerant in the collecting plate.

[0006] On the basis of the above technical solution, optionally, the cooling capacity compensation component includes: A heat conducting element, wherein the heat conducting element is disposed through the current collecting plate along the first direction, and a portion of the heat conducting element is exposed to the outside of the current collecting plate; A cooling element is in contact with the portion of the thermally conductive element to cool the portion of the thermally conductive element.

[0007] On the basis of any of the above technical solutions, optionally, the current collecting plate has a current collecting channel, and the current collecting channel includes: a first flow channel extending along a third direction; a plurality of second flow channels, a portion of the plurality of second flow channels being located on one side of the first flow channel in the second direction and being connected in sequence, another portion of the plurality of second flow channels being located on the other side of the first flow channel in the second direction and being connected in sequence, each of the second flow channels extending along the third direction, and each of the second flow channels being used to receive the refrigerant transported from the first flow channel; Wherein, the cooling capacity compensation component is used to cool the refrigerant in the first flow channel.

[0008] Based on any of the above technical solutions, optionally, the cooling capacity compensation component includes: a heat-conducting element, the heat-conducting element being arranged in the first flow channel along the first direction, and a portion of the heat-conducting element being exposed to the outside of the current collecting plate; A cooling element is in contact with the portion of the thermally conductive element to cool the portion of the thermally conductive element.

[0009] Based on any of the above 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 conductive element is opposite to the flow channel inlet to divert the refrigerant entering the first flow channel through the flow channel inlet.

[0010] Based on any of the above technical solutions, optionally, the heat sink includes a plurality of sub-channels, the plurality of sub-channels are arranged along the first direction and are sequentially connected, and there are air gaps between adjacent sub-channels.

[0011] On the basis of any of the above technical solutions, optionally, the liquid-cooled battery pack further includes a protective shell and a protective top cover that are detachably connected to each other, and the multiple battery cells, the liquid cooling plate, the current collecting plate and the multiple heat dissipation plates are all arranged in a space defined by the protective shell and the protective top cover. Wherein, the liquid-cooled battery pack also includes a sealing gasket, which is arranged between the protective shell and the protective top cover to seal the gap between the protective shell and the protective top cover.

[0012] Based on any of the above technical solutions, optionally, the liquid-cooled battery pack also includes an elastic frame, which is arranged around the outside of the multiple battery cells and between the multiple battery cells and the protective shell, and the liquid-cooled battery pack also includes an insulating protective plate arranged between the protective top cover and the multiple battery cells.

[0013] On the basis of any of the above technical solutions, optionally, the inner side of the elastic frame has an elastic protrusion, and the elastic protrusion is inserted between adjacent single batteries in a battery unit column adjacent to the elastic frame.

[0014] A second aspect of the present application provides a vehicle, comprising the liquid-cooled battery pack as described above.

[0015] According to the liquid-cooled battery pack provided in the present application, the refrigerant flows from the liquid cooling plate to the current collecting plate, and then from the current collecting plate to the heat sink. The refrigerant that has exchanged heat with the battery cells in the liquid cooling plate is cooled again in the current collecting plate by the cooling of the cold capacity compensation component at the current collecting plate. Therefore, when these refrigerants flow to the corresponding heat sink, the temperature is not high, which leads to poor heat exchange with the battery cells, and further causes uneven cooling of the battery cells.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a three-dimensional diagram of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0019] Figure 2A schematic diagram of an exploded view of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0020] Figure 3 A schematic diagram of a cross-sectional view of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0021] Figure 4 Shows Figure 3 Schematic diagram of the enlarged view at A in the middle.

[0022] Figure 5 A schematic diagram of a three-dimensional diagram of the cooling-related structure of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0023] Figure 6 A schematic diagram of a decomposition diagram of a cooling-related structure of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0024] Figure 7 A schematic diagram of a three-dimensional diagram of a current collecting plate of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0025] Figure 8 A schematic diagram of a three-dimensional image of a heat sink for a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0026] Fig. 9 A schematic diagram of a cross-sectional view of a current collecting plate of a liquid-cooled battery pack provided according to an embodiment of the present application is shown.

[0027] Reference numerals: 1-protective shell; 2-protective top cover; 201-insulating protective plate; 202-wiring harness hole; 3-heat dissipation bottom plate; 301-positioning placement groove; 302-first water outlet; 303-first water inlet; 4-battery unit; 5-water inlet interface; 6-heat dissipation collecting plate; 601-second water inlet; 602-second drain outlet; 603-partition; 7-rubber sealing ring; 8-sealing tube; 9-copper tube; 10-copper plate; 11-semiconductor refrigerator; 12-lateral heat dissipation plate; 13-return pipe; 14-sealing gasket; 15-fastening bolt; 16-rectangular foam frame; 17-foam protrusion; 18-mounting bracket; 19-lifting hole. DETAILED DESCRIPTION

[0028] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] According to an embodiment of the present application, a liquid-cooled battery pack is provided. The structure and working principle of the liquid-cooled battery pack will be described in detail below with reference to the accompanying drawings.

[0033] According to the liquid-cooled battery pack provided in the embodiment of the present application, the liquid-cooled battery pack includes a plurality of battery cells, a liquid cooling plate, a current collecting plate and a plurality of heat dissipation plates.

[0034] In an embodiment, the plurality of battery cells are arranged into 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 an embodiment, the liquid cooling 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 in pairs.

[0035] In an embodiment, the liquid-cooled battery pack further includes a current collecting plate configured for each pair of adjacent battery cell columns, the current collecting plate is disposed between corresponding adjacent battery cell columns, and the current collecting plate is communicated with the liquid cooling plate.

[0036] In an embodiment, the liquid-cooled battery pack further includes a plurality of heat sinks configured for each battery cell column, each heat sink is disposed between battery cells adjacent in a first direction, and each heat sink is connected to a current collecting plate adjacent in a second direction.

[0037] In an embodiment, the liquid-cooled battery pack also includes a cold capacity compensation component, which is connected to a current collecting plate. The current collecting plate is used to circulate the refrigerant transported by the liquid cooling plate and transport the refrigerant to a heat sink connected to the current collecting plate. The cold capacity compensation component is used to exchange heat with the refrigerant in the current collecting plate to cool the refrigerant in the current collecting plate.

[0038] In this way, according to the liquid-cooled battery pack provided in the embodiment of the present application, the refrigerant flows from the liquid cooling plate to the current collecting plate, and then from the current collecting plate to the heat sink. The refrigerant that has exchanged heat with the battery cells in the liquid cooling plate is cooled again in the current collecting plate through the cooling of the cold capacity compensation component. Therefore, when these refrigerants flow to the corresponding heat sink, the temperature is not high, which leads to poor heat exchange with the battery cells, and further causes uneven cooling of the battery cells.

[0039] In the embodiment, as an example, the first direction may be, for example, the length direction of the battery pack, the second direction may be, for example, the width direction of the battery pack, and the third direction may be, for example, 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.

[0040] According to the liquid-cooled battery pack provided in the embodiment of the present application, the cold compensation component may include 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, a portion of the heat-conducting element is exposed to the outside of the current collecting plate, and the cooling element may contact a portion of the heat-conducting element to cool the portion of the heat-conducting element.

[0041] Thus, according to the liquid-cooled battery pack provided in the embodiment of the present application, the heat-conducting element is directly disposed in the current collecting plate, so that a portion of the heat-conducting element can directly contact the refrigerant inside the current collecting plate, thereby improving the cooling efficiency of the heat-conducting element on the refrigerant. In the embodiment, the cooling element provides cooling for the heat-conducting element.

[0042] According to the liquid-cooled battery pack provided in the embodiment of the present application, the current collecting plate may have a current collecting channel, and the current collecting channel may include a first channel and a plurality of second channels. In an embodiment, the first channel may extend along a third direction, a portion of the plurality of second channels may be located on one side of the first channel in the second direction and connected in sequence, another portion of the plurality of second channels may be located on the other side of the first channel in the second direction and connected in sequence, each second channel may extend along the third direction, and each second channel may be used to receive the refrigerant transported from the first channel. In an embodiment, the cold capacity compensation component is used to cool the refrigerant in the first channel.

[0043] In this way, according to the liquid-cooled battery pack provided in the embodiment of the present application, the first flow channel is equivalent to the main flow channel, and the cold capacity compensation component cools the refrigerant in the first flow channel, which is beneficial to distributing the cooled refrigerant to the second flow channel as a branch channel, thereby ensuring that the refrigerant in the collecting plate is sufficiently cooled.

[0044] Therefore, in an embodiment, the heat-conducting element as described above may be arranged in the first flow channel along the first direction, so as to directly contact the refrigerant in the first flow channel.

[0045] According to the liquid-cooled battery pack provided in an embodiment of the present application, the first flow channel may have a flow channel inlet located on one side of the first flow channel in the third direction, and the heat conductive element may be opposite to the flow channel inlet to divert the refrigerant entering the first flow channel through the flow channel inlet.

[0046] In this way, according to the liquid-cooled battery pack provided in the embodiment of the present application, the thermal conductive element not only plays a role in cooling the refrigerant inside the first flow channel, but also directly plays a role in diverting the refrigerant in the first flow channel, thereby providing a more complex path for the flow of the refrigerant and increasing the heat exchange time between the refrigerant and the thermal conductive element.

[0047] In other words, in the embodiment, the heat conducting element itself can have a relatively high height. For example, a partition 603 as described later can be provided 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 tube 9 described later) can be slightly less than the height of the partition 603.

[0048] In an embodiment, the heat-conducting element may be, for example, a U-shaped tube, which means that, for a heat-conducting element, starting from the refrigerant diversion below it and ending at the refrigerant diversion above it, the refrigerants on both sides of the U-shaped tube in the width direction of the battery pack are not completely isolated, but are able to be exchanged.

[0049] Specifically, after the U-shaped tube diverts the refrigerant at the bottom, the refrigerant will be divided into two streams and exchanged with each other through the middle area of ​​the U-shaped tube. On the one hand, the refrigerant will accelerate when flowing through the surface of the lower side of the U-shaped tube after the diversion, so that it will flow upward quickly, and then the refrigerants on both sides will meet under accelerated conditions. Since the refrigerants on both sides meet with increased initial velocity, the refrigerants on both sides will be fully mixed in the middle area of ​​the U-shaped tube, and the flow resistance will increase, thereby increasing the heat exchange time between the refrigerant and the U-shaped tube.

[0050] Then, the refrigerant will continue to be diverted on the upper side of the U-shaped tube. Because the refrigerant circulation space is larger before the upper diversion position, the diversion on the upper side will increase the flow rate of the refrigerant on both sides, so that the refrigerant can "turn around" and flow into the second flow channel as soon as possible when the first flow channel and the second flow channel are arranged side by side, avoiding the loss of refrigerant speed due to the arrangement position of the first flow channel and the second flow channel. It is also beneficial to avoid the loss of refrigerant speed and the possible accumulation of sediment at the intersection of the first flow channel and the second flow channel.

[0051] According to the liquid-cooled battery pack provided in the embodiment of the present application, the heat sink may include a plurality of sub-flow channels, the aforementioned plurality of sub-flow channels are arranged along the first direction and connected in sequence, and there is an air gap between adjacent sub-flow channels. In this way, the heat sink can effectively provide cooling for the battery cells through the contact between the sub-flow channels and the adjacent battery cells, and the air gap between the sub-flow channels is also conducive to the heat dissipation of the heat sink to the outside.

[0052] According to the liquid-cooled battery pack provided in the embodiment of the present application, the liquid-cooled battery pack may also include a protective shell and a protective top cover that are detachably connected to each other, and the above-mentioned multiple battery cells, liquid cooling plates, collecting plates and multiple heat dissipation plates may all be arranged in the space defined by the protective shell and the protective top cover.

[0053] In an embodiment, the liquid-cooled battery pack may further include a sealing gasket, which is disposed between the protective shell and the protective top cover to seal a gap between the protective shell and the protective top cover.

[0054] According to the liquid-cooled battery pack provided in the embodiment of the present application, the liquid-cooled battery pack may further include an elastic frame, which may be arranged around the outside of the multiple battery cells and between the multiple battery cells and the protective shell. The liquid-cooled battery pack may further include an insulating protective plate arranged between the protective top cover and the multiple battery cells.

[0055] According to the liquid-cooled battery pack provided in the embodiment of the present application, the inner side of the elastic frame may have an elastic protrusion, and the elastic protrusion may be inserted between adjacent single cells in a battery cell column adjacent to the elastic frame to form buffer protection for the adjacent single cells.

[0056] The embodiment of the present application aims to provide a water cooling structure integrated in a power battery, in which the cooling water is cooled once during the circulation process of the cooling water entering the water cooling structure in the power battery, so as to avoid the phenomenon of uneven cooling of the battery cells due to the gradual increase in the cooling water temperature.

[0057] The specific example implementation method of the embodiment of the present application is as follows. A heat dissipation base plate 3 is installed inside the protective shell 1, and multiple groups of battery cells 4 are fixed and glued to the top surface of the heat dissipation base plate 3 inside the protective shell 1. A water inlet interface 5 is plugged at the input end of the heat dissipation base plate 3. The protective shell 1 and the protective top cover 2 are detachably fixed and installed by fastening bolts 15. The protective shell 1 and the protective top cover 2 are used to safely protect the multiple groups of battery cells 4 inside the protective shell 1.

[0058] In the embodiment, a heat dissipation collecting plate 6 is installed on the top surface of the heat dissipation bottom plate 3, and a rubber sealing ring 7 is pressed at the connection between the heat dissipation bottom plate 3 and the heat dissipation collecting plate 6 to seal the connection between the heat dissipation bottom plate 3 and the heat dissipation collecting plate 6 to prevent leakage when the cooling water circulates. In the embodiment, sealing tubes 8 are installed at both ends of the heat dissipation collecting plate 6, and the output ends on both sides of the heat dissipation collecting plate 6 are respectively connected to lateral heat dissipation plates 12, which are in an I-shaped structure and fit the surface of the battery unit 4 inside the protective housing 1.

[0059] In the embodiment, a copper tube 9 is inserted into the interior of the sealing tube 8, two groups of partitions 603 are fixedly installed on the inner wall of the heat dissipation water collecting plate 6, and a gap of a certain height is provided between the top surface of the two groups of partitions 603 and the inner top surface of the heat dissipation water collecting plate 6, and the copper tube 9 is located inside the heat dissipation water collecting plate 6 and between the two groups of partitions 603 to guide the flow direction of the cooling water through the two groups of partitions 603, and a copper plate 10 is fixedly installed at the end of the copper tube 9, and a semiconductor refrigerator 11 is fixedly installed on the end surface of the copper plate 10. Among them, the cooling end of the semiconductor refrigerator 11 is tightly fitted with the copper plate 10, and the output end of the plurality of groups of lateral heat dissipation plates 12 is fixedly connected with a return pipe 13, and the return pipe 13 passes through the protective housing 1 and extends to the outside.

[0060] In the embodiment, the battery cells 4 are placed equidistantly on the heat dissipation base plate 3, and the surfaces of the battery cells 4 are respectively in contact with the top surface of the heat dissipation base plate 3, the surface of the heat dissipation collecting plate 6 and the surface of the lateral heat dissipation plate 12, and are connected to the water cooling system of the power battery through the water inlet interface 5. The cooling water enters the heat dissipation base plate 3 through the water inlet interface 5, then enters the heat dissipation collecting plate 6, and then flows into the lateral heat dissipation plate 12, and finally is discharged through the return pipe 13 and flows back to the water cooling system, thereby realizing the circulation of cooling water.

[0061] In the embodiment, the inside of the heat dissipation water collecting plate 6 is formed into a water collecting chamber by two groups of partitions 603 on the inner wall of the heat dissipation water collecting plate 6, and the copper tube 9 inside the heat dissipation water collecting plate 6 is in contact with the cooling water flowing in the heat dissipation water collecting plate 6, and at the same time, the copper plate 10 and the copper tube 9 are cooled by the semiconductor refrigerator 11. Since the copper plate 10 and the copper tube 9 are both made of metal copper, which has high thermal conductivity, the cooling water flowing in the heat dissipation water collecting plate 6 can be cooled by the copper tube 9, so as to avoid the phenomenon of uneven cooling of the battery unit 4 due to the gradual increase of the temperature of the cooling water when the cooling water circulates.

[0062] In the embodiment of the present application, a sealing gasket 14 is placed on the top surface of the protective shell 1 and between the protective shell 1 and the protective top cover 2 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 fastening bolts 15. A mounting bracket 18 is welded and installed on the surface of the protective shell 1, and a mounting hole 19 is opened on the surface of the mounting bracket 18. The cross-section of the mounting bracket 18 is a U-shaped structure.

[0063] In the embodiment, when the protective shell 1 and the protective top cover 2 are fixed, it is necessary to fit the sealing gasket 14 on the top surface of the protective shell 1, wherein the through hole opened on the surface of the sealing gasket 14 corresponds to the mounting hole of the protective shell 1 and the protective top cover 2, and after the protective shell 1 and the protective top cover 2 are fixed by the fastening bolts 15, the sealing gasket 14 is in a compressed state. The sealing gasket 14 is used to seal the gap between the protective shell 1 and the protective top cover 2, improve the sealing of the interior of the protective shell 1, prevent external dust and impurities and water from entering the interior of the protective shell 1, and improve the safety of the battery unit 4 inside the protective shell 1. The power battery pack can be connected and fixed to the new energy vehicle through the mounting parts through the hanging holes 19 on the surface of the mounting bracket 18.

[0064] In the embodiment of the present application, 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 multiple battery cells 4 in the protective shell 1, and the insulating protective plate 201 can be made of compressible material. The surface of the protective shell 1 is provided with a 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 to fit the top surface of the multiple battery cells 4 in the protective shell 1. By using a compressible material such as rubber, foam, etc. for the insulating protective plate 201, a buffer barrier can be formed between the battery cell 4 and the protective shell 1 to improve the safety of the battery cell 4. The 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 cell 4 inside the protective shell 1.

[0065] In the embodiment of the present application, a plurality of groups of symmetrically arranged positioning grooves 301 are provided on the top of the heat dissipation base plate 3 to position and place the battery unit 4 during installation. At least one group of first water outlets 302 are provided on the end face of the heat dissipation base plate 3, and the water inlet interface 5 is installed in the first water outlet 302. A plurality of groups of first water inlets 303 are linearly arranged on the top face of the heat dissipation base plate 3 and located in the middle thereof. A plurality of groups of equidistantly arranged reinforcing plates can be vertically installed inside the heat dissipation base plate 3.

[0066] In the embodiment, the heat dissipation base plate 3 is made of metal material, preferably copper. The two groups of first water outlets 302 on the end surface of the heat dissipation base plate 3 are fixedly installed with water inlet interfaces 5, and the heat dissipation base plate 3 is connected to the pipeline of the water cooling system through the water inlet interface 5. The battery unit 4 can be positioned when placed inside the protective shell 1 through multiple groups of positioning grooves 301 on the top surface of the heat dissipation base plate 3. In the embodiment, the bottom surface of the battery unit 4 can be fixed in the positioning groove 301 by a colloid, and multiple groups of vertical reinforcing plates on the inner wall of the heat dissipation base plate 3 can improve the structural strength of the cavity of the heat dissipation base plate 3 and improve its compressive load-bearing capacity.

[0067] The bottom surface of the heat dissipation collecting plate 6 of the embodiment of the present application is provided with a recess corresponding to the first water inlet 303, and a second water inlet 601 is fixedly installed in the recess. When the heat dissipation collecting plate 6 and the heat dissipation base plate 3 are installed, the second water inlet 601 is fixedly plugged with the first water inlet 303, and its rubber sealing ring 7 is fixedly sleeved with the surface of the second water inlet 601. Several groups of second drainage ports 602 are equidistantly provided on both side walls of the heat dissipation collecting plate 6, and the heat dissipation collecting plate 6 is made of metal copper.

[0068] In the embodiment, the second water inlet 601 on the bottom surface of the heat dissipation collecting plate 6 is fixedly plugged with the first water inlet 303 on the top of the heat dissipation bottom plate 3, so that the rubber sealing ring 7 is compressed, and 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, and the output end of the lateral heat dissipation plate 12 is plugged with the second drain port 602 on the two side walls of the heat dissipation collecting plate 6 to realize the connection between the lateral heat dissipation plate 12 and the heat dissipation collecting plate 6, wherein the inlet and outlet parts of the lateral heat dissipation plate 12 are staggered in height, so that the cooling water can flow and circulate in the lateral heat dissipation plate 12.

[0069] The inner wall of the protective shell 1 of the embodiment of the present application is fixedly fitted 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 cells 4, and the foam protrusions 17 are tightly fitted to the surface of the battery cell 4, and the rectangular foam frame 16 and the foam protrusions 17 are both made of hard foam material to separate the battery cell 4 from the protective shell 1 and the battery cell 4 from the battery cell 4.

[0070] In the embodiment, the battery cells 4 and the protective shell 1 are separated by a rectangular foam frame 16 fixed to the inner wall of the protective shell 1, and the two groups of battery cells 4 are separated by the foam protrusions 17 at the inner edges of the rectangular foam frame 16 located between the battery cells 4. The rectangular foam frame 16 and the foam protrusions 17 support the gaps between the battery cells 4 and the battery cells 4 and the protective shell 1, and form a buffer isolation line, which plays a supporting and protective role while separating them.

[0071] According to the second aspect of an embodiment of the present application, a vehicle is provided, which includes a liquid-cooled battery pack as above and has the above beneficial effects, which will not be repeated here. The vehicle can be a new energy vehicle, and the battery pack can be, for example, a power battery pack, and at least part of the power of the vehicle is provided by the battery pack.

[0072] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A liquid-cooled battery pack, characterized in that: The liquid-cooled battery pack comprises: A plurality of battery cells, wherein the plurality of battery cells are arranged into a plurality of battery cell columns, each of the battery cell columns is arranged along a first direction, and the plurality of battery cells are arranged at intervals along a second direction intersecting the first direction; a liquid cooling plate, the liquid cooling plate being arranged on one side of the plurality of battery cells in a third direction, wherein the third direction intersects with the first direction and the second direction in pairs; Wherein, the liquid-cooled battery pack further includes 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 connected to the liquid cooling plate; The liquid-cooled battery pack further comprises a plurality of heat sinks configured for each battery cell column, each heat sink is disposed between battery cells adjacent in the first direction, and each heat sink is connected to a current collecting plate adjacent in the second direction; Among them, the liquid-cooled battery pack also includes a cold capacity compensation component, which is connected to the collecting plate. The collecting plate is used to circulate the refrigerant transported by the liquid cooling plate and transport the refrigerant to the heat sink connected to the collecting plate. The cold capacity compensation component is used to exchange heat with the refrigerant in the collecting plate to cool the refrigerant in the collecting plate.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The cooling capacity compensation component comprises: A heat conducting element, wherein the heat conducting element is disposed through the current collecting plate along the first direction, and a portion of the heat conducting element is exposed to the outside of the current collecting plate; A cooling element is in contact with the portion of the thermally conductive element to cool the portion of the thermally conductive element.

3. The liquid-cooled battery pack according to claim 1, characterized in that: The current collecting plate has a current collecting channel, and the current collecting channel includes: a first flow channel extending along a third direction; a plurality of second flow channels, a portion of the plurality of second flow channels being located on one side of the first flow channel in the second direction and being connected in sequence, another portion of the plurality of second flow channels being located on the other side of the first flow channel in the second direction and being connected in sequence, each of the second flow channels extending along the third direction, and each of the second flow channels being used to receive the refrigerant transported from the first flow channel; Wherein, the cooling capacity compensation component is used to cool the refrigerant in the first flow channel.

4. The liquid-cooled battery pack according to claim 3, characterized in that: The cooling capacity compensation component comprises: a heat-conducting element, the heat-conducting element being arranged in the first flow channel along the first direction, and a portion of the heat-conducting element being exposed to the outside of the current collecting plate; A cooling element is in contact with the portion of the thermally conductive element to cool the portion of the thermally conductive element.

5. The liquid-cooled battery pack according to claim 4, characterized in that: 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 conducting element faces the flow channel inlet to divert the refrigerant entering the first flow channel through the flow channel inlet.

6. The liquid-cooled battery pack according to claim 1, characterized in that: The heat dissipation plate includes a plurality of sub-flow channels, which are arranged along the first direction and are connected in sequence, and there are air gaps between adjacent sub-flow channels.

7. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery pack further includes a protective shell and a protective top cover that 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 are all arranged in a space defined by the protective shell and the protective top cover. Wherein, the liquid-cooled battery pack also includes a sealing gasket, which is arranged between the protective shell and the protective top cover to seal the gap between the protective shell and the protective top cover.

8. The liquid-cooled battery pack according to claim 7, characterized in that: The liquid-cooled battery pack also includes an elastic frame, which is arranged around the outside of the multiple battery cells and between the multiple battery cells and the protective shell. The liquid-cooled battery pack also includes an insulating protective plate arranged between the protective top cover and the multiple battery cells.

9. The liquid-cooled battery pack according to claim 8, characterized in that: The elastic frame has an elastic protrusion on the inner side thereof, and the elastic protrusion is inserted between adjacent single batteries in a battery cell column adjacent to the elastic frame.

10. A vehicle, characterized in that: The vehicle comprises a liquid-cooled battery pack as claimed in any one of claims 1 to 9.

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