Battery cold plate and battery module

Abstract

The embodiment of the invention provides a battery cold plate and a battery module. The battery cold plate comprises: a runner plate, which is provided with a pair of liquid separation runners, a pair of circulation runners, a pair of liquid collection runners, a pair of liquid outlet parallel runners and a pair of liquid outlet merging runners; a flat plate connected to the runner plate; a refrigerant in any circulating flow channel can be converged into the corresponding liquid converging flow channel and is shunted to the corresponding liquid outlet parallel flow channel; each liquid separation flow channel comprises at least two liquid inlet branch flow channels, each circulating flow channel comprises at least two sub-circulating flow channels, and each liquid inlet branch flow channel is communicated with at least one sub-circulating flow channel; each liquid outlet parallel flow channel comprises at least two dryness balancing flow channels, each liquid outlet merging flow channel comprises at least two liquid outlet branch flow channels, and each liquid outlet branch flow channel is communicated with at least one dryness balancing flow channel. The battery cold plate has better temperature uniformity, so that the heat dissipation effect of the battery cold plate on the battery module is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and in particular to a battery cold plate and a battery module. Background Art

[0002] Battery modules generate heat during the charging and discharging process, and liquid-cooled battery cold plates are currently used on the market to dissipate heat from battery modules. The common liquid cooling method uses coolant or refrigerant to remove the heat generated by several battery cells in the battery module. Since the coolant or refrigerant absorbs heat through its own heat capacity, it will cause a temperature difference between the inlet and outlet of the battery cold plate, resulting in poor cooling effect of the battery module. Although the design of the existing battery cold plate meets basic functional requirements, its poor cooling effect also means that there is room for improvement in the existing battery cold plate. Therefore, how to improve the cooling effect of the existing battery cold plate on the battery module has become an important direction for the current improvement of battery cold plate design. Summary of the Invention

[0003] The battery cold plate and battery module provided in the embodiments of the present application are intended to address at least some of the defects of existing battery cold plates used to cool battery modules.

[0004] In a first aspect, the present application provides a battery cold plate. The battery cold plate is used in conjunction with a refrigerant to cool a battery module, and the battery cold plate includes: A flow channel plate, on which a liquid flow channel is formed, and the refrigerant can flow in the liquid flow channel; a flat plate connected to the flow channel plate, wherein the surface of the flat plate can close the liquid flow channel to limit leakage of the refrigerant from the liquid flow channel; The liquid flow channel includes a liquid inlet flow channel, a liquid outlet flow channel, a pair of liquid separation flow channels, a pair of circulation flow channels, a pair of liquid converging flow channels, a pair of liquid outlet parallel flow channels and a pair of liquid outlet merging flow channels; A pair of liquid separation channels are respectively arranged at two opposite ends of the liquid inlet channel, and a pair of liquid outlet merging channels are respectively arranged at two opposite ends of the liquid outlet channel; The refrigerant in any of the circulation channels can be collected into a corresponding liquid converging channel and then divided into a corresponding liquid discharging parallel channel; Each of the liquid separation channels includes at least two liquid inlet branch channels connected in parallel, each of the circulation channels includes at least two sub-circulation channels connected in parallel, and each of the liquid inlet branch channels is connected to at least one of the sub-circulation channels; Each of the parallel liquid outlet flow channels includes at least two mutually parallel dryness balancing flow channels, each of the liquid outlet merging flow channels includes at least two mutually parallel liquid outlet branch flow channels, and each of the liquid outlet branch flow channels is connected to at least one of the dryness balancing flow channels.

[0005] In some embodiments, one group of liquid-splitting flow channels of the pair of liquid-splitting flow channels, one group of circulating flow channels of the pair of circulating flow channels, one converging flow channel of the pair of converging flow channels, one group of liquid-outlet parallel flow channels of the pair of liquid-outlet parallel flow channels, and one group of liquid-outlet merging flow channels of the pair of liquid-outlet merging flow channels are sequentially connected to form a first cooling circuit; Another group of liquid separation channels of the pair of said liquid separation channels, another group of circulation channels of the pair of said circulation channels, another liquid converging channel of the pair of said liquid converging channels, another group of liquid outlet parallel channels of the pair of said liquid outlet parallel channels and another group of liquid outlet merging channels of the pair of said liquid outlet merging channels are connected in sequence to form a second cooling circuit.

[0006] In some embodiments, a flow channel inlet is provided at a middle position of the liquid inlet flow channel, and a flow channel outlet is provided at a middle position of the liquid outlet flow channel; The refrigerant flows in the first cooling circuit and the second cooling circuit both from the flow channel inlet and out from the flow channel outlet.

[0007] In some embodiments, a pair of the circulation channels, a pair of the liquid converging channels, and a pair of parallel liquid discharge channels together enclose a cooling area, the battery module is abutted against the surface of the flat plate facing away from the channel plate through thermal conductive glue, and the assembly position of the battery module corresponds to the cooling area.

[0008] In some embodiments, the plate has a first surface and a second surface opposite to each other in the thickness direction, and a general inlet and a general outlet penetrating the first surface and the second surface are provided at a middle position of the plate near an edge thereof; The flow channel plate is fixed on the first surface of the flat plate, the main inlet is connected to the flow channel inlet, and the main outlet is connected to the flow channel outlet.

[0009] In some embodiments, the battery cold plate further comprises: an inlet and outlet joint having a liquid inlet pipe and a liquid outlet pipe, and the inlet and outlet joint is fixed to the second surface of the plate; The liquid inlet pipe is connected to the main inlet, so that the refrigerant flows from the liquid inlet pipe into the liquid inlet flow channel; The liquid outlet pipe is communicated with the main outlet so that the refrigerant flows out from the liquid outlet channel to the liquid outlet pipe.

[0010] In some embodiments, any one of the sub-circulation channels in each of the circulation channels is S-shaped.

[0011] In some embodiments, the battery cold plate further comprises: A support beam is fixedly mounted on the second surface of the flat plate, and the battery module is fixedly assembled on the support beam; The heat of the battery module can be transferred to the second surface of the flat plate through the thermal conductive adhesive and carried away by the refrigerant flowing in the cooling area.

[0012] In some embodiments, one end of any of the circulation channels connected to its corresponding branch channel is close to its corresponding liquid outlet parallel channel.

[0013] In a second aspect, the present application provides a battery module. The battery module comprises: Several battery cells, battery cell brackets and end plates; A plurality of the battery cells are arranged on the battery cell holder in a preset manner, and the end plates are provided on opposite sides of the battery cell holder; The battery cell bracket can be fixed on the support beam of the battery cold plate through the end plate, and the heat generated by the plurality of battery cells can be cooled by the battery cold plate.

[0014] At least one beneficial effect of the battery cold plate and battery module provided by the embodiment of the present application is: a new type of battery cold plate is proposed to cool the battery module in combination with a refrigerant. The battery cold plate includes a flow channel plate and a flat plate. A liquid flow channel is provided on the flow channel plate, and the refrigerant can flow in the liquid flow channel. The flat plate and the flow channel plate are connected to each other. At this time, the surface of the flat plate can close the liquid flow channel to limit the refrigerant from leaking out of the liquid flow channel. The above-mentioned liquid flow channel includes a liquid inlet channel, a liquid outlet channel, a pair of liquid separation channels, a pair of circulation channels, a pair of liquid converging channels, a pair of liquid outlet parallel channels and a pair of liquid outlet merging channels. A pair of liquid separation channels are respectively arranged at the opposite ends of the liquid inlet channel, and a pair of liquid outlet merging channels are respectively arranged at the opposite ends of the liquid outlet channel. The refrigerant in any circulation channel can be merged into a corresponding liquid converging channel. And divided into corresponding liquid outlet parallel flow channels, each liquid separation flow channel includes at least two mutually parallel liquid inlet branch flow channels, each circulation flow channel includes at least two mutually parallel sub-circulation flow channels, and each liquid inlet branch flow channel is connected to at least one sub-circulation flow channel, each liquid outlet parallel flow channel includes at least two mutually parallel dryness balancing flow channels, each liquid outlet merging flow channel includes at least two mutually parallel liquid outlet branch flow channels, and each liquid outlet branch flow channel is connected to at least one dryness balancing flow channel; through the above structural design, the battery cold plate has better temperature uniformity, thereby improving the heat dissipation effect of the battery cold plate on the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application, the following briefly introduces the drawings required for describing the specific embodiments. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic structural diagram of a battery module provided in an embodiment of the present application being assembled on a battery cold plate; Figure 2 1 is an exploded schematic diagram of a battery cold plate provided in an embodiment of the present application; Figure 3 is a partial cross-sectional schematic diagram of a battery cold plate provided in an embodiment of the present application; Figure 4 This embodiment of the present application provides Figure 2 A local enlarged view at point A; Figure 5 1 is a front view schematic diagram of the flow channel plate provided in an embodiment of the present application; Figure 6 It is a structural schematic diagram of the battery module provided in an embodiment of the present application.

[0017] Reference numerals: 100, Battery Cold Plate; 1, Flow Channel Plate; 11, Liquid Inlet Flow Channel; 12, Liquid Outlet Flow Channel; 13, Liquid Separation Flow Channel; 14, Circulation Flow Channel; 15, Liquid Convergence Flow Channel; 16, Liquid Outlet Parallel Flow Channel; 17, Liquid Outlet Merging Flow Channel; 101, Cooling Area; 111, Flow Channel Inlet; 121, Flow Channel Outlet; 131, Liquid Inlet Branch Flow Channel; 141, Sub-Circulation Flow Channel; 161, Dryness Balance Flow Channel; 171, Liquid Outlet Branch Flow Channel; 13 11. First liquid inlet channel; 1312. Second liquid inlet channel; 1411. First sub-circulation channel; 1412. Second sub-circulation channel; 1611. First balancing channel; 1612. Second balancing channel; 1711. First liquid outlet channel; 1712. Second liquid outlet channel; 2. Flat plate; 201. Main inlet; 202. Main outlet; 3. Inlet and outlet joints; 301. Liquid inlet pipe; 302. Liquid outlet pipe; 4. Support beam; 200, battery module; 2001, battery cell; 2002, battery cell bracket; 2003, end plate. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed on" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 a limitation on the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0020] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0021] Figure 1 This is a structural schematic diagram of the battery module provided in an embodiment of the present application assembled on a battery cold plate. Figure 2 Schematic diagram of the battery cold plate provided in the embodiment of the present application. Figure 3 It is a partial cross-sectional schematic diagram of the battery cold plate provided in an embodiment of the present application. Figure 4 This embodiment of the present application provides Figure 2 A partial enlarged view of point A. Figure 5 It is a front view schematic diagram of the flow channel plate provided in an embodiment of the present application. Figure 6 It is a structural schematic diagram of the battery module provided in an embodiment of the present application.

[0022] See also Figures 1-6 The battery cold plate 100 cooperates with the refrigerant to cool the battery module 200 .

[0023] It should be noted that the battery module generates heat during the charging and discharging process. In order to prevent the battery module from overheating and causing performance degradation or spontaneous combustion, a liquid-cooled battery cold plate is often used to dissipate heat from the battery module. Among them, a common cooling method is to use a refrigerant to take away the heat of several battery cells in the battery module. Since the refrigerant absorbs heat through its own heat capacity, the traditional battery cold plate will cause a temperature difference at the inlet and outlet, thereby reducing the cooling effect on the battery module. The battery cold plate 100 adopts evaporative phase change refrigeration, relying on its own latent heat to absorb heat, and the refrigerant temperature is maintained near the evaporation temperature to obtain a higher heat exchange efficiency and good temperature uniformity, thereby improving the cooling effect of the battery cold plate 100 on the battery module.

[0024] It can be understood that evaporative phase change refrigeration refers to a method of achieving a cooling effect by utilizing the phase change of the refrigerant during the evaporation process (from liquid to gas) to absorb heat; wherein, during the evaporation phase change process, the refrigerant absorbs heat from the surrounding environment or the cooled object (for example, absorbing the heat of the battery module), causing itself to gradually change from liquid to gas; for example, in common household air conditioners, the refrigerant (for example, Freon) evaporates in the evaporator of the indoor unit, absorbing heat from the indoor air and lowering the indoor temperature.

[0025] Generally speaking, maintaining the refrigerant temperature near the evaporation temperature has two functions: clarifying the operating state and ensuring the cooling effect. The evaporation temperature is the temperature at which the refrigerant begins to boil (or evaporate) under a specific pressure. When the refrigerant is in the evaporation phase change cooling state, as long as the pressure remains relatively stable, its temperature will be maintained near the evaporation temperature. This provides a relatively stable operating temperature benchmark for the entire battery cold plate 100, allowing the cooling process to proceed under controllable conditions. In addition, a stable temperature helps ensure that the refrigerant can continuously and efficiently absorb heat. If the refrigerant temperature fluctuates greatly, the cooling effect may be unstable and the expected cooling effect may not be achieved.

[0026] It is further explained that the principles of increasing heat exchange efficiency include the efficient use of latent heat of phase change and the driving force of maintaining a large temperature difference; among them, when a substance undergoes a phase change (such as from liquid to gas), it will absorb or release a large amount of latent heat (latent heat refers to the heat absorbed or released by a substance during a phase change such as melting, solidification, vaporization, liquefaction, sublimation, and condensation, while the temperature of the substance itself remains unchanged during the phase change process), and the temperature remains basically unchanged. In evaporative phase change refrigeration, the heat absorbed by the refrigerant when it evaporates is mainly latent heat. The absorption capacity of this latent heat is much greater than the sensible heat absorption capacity caused by a simple temperature change (sensible heat refers to the heat absorbed or released by a substance during a temperature change without a phase change. Energy exchange is directly manifested as the rise and fall of an object's temperature. For example, when water boils, although its temperature remains constant at 100°C (at standard atmospheric pressure), it absorbs a large amount of heat to complete the transition from liquid to gas. Therefore, the refrigerant can more efficiently absorb the heat of the cooled object through the latent heat of phase change, thereby increasing the heat exchange efficiency of the battery cold plate 100. In addition, because the refrigerant temperature is maintained near the evaporation temperature, a relatively stable temperature difference can be maintained between the refrigerant and the cooled object. Temperature difference is the driving force of heat transfer. A larger temperature difference can accelerate the speed of heat transfer, allowing the heat of the cooled object to be transferred to the refrigerant more quickly, further improving the heat exchange efficiency of the battery cold plate 100.

[0027] Specifically, the reasons for increasing temperature uniformity include stable cooling capacity output and uniform fluid flow and heat exchange. Among them, the refrigerant temperature is stable near the evaporation temperature, which means that its cooling capacity output is also relatively stable. In the entire refrigeration area, the refrigerant can absorb heat at a relatively uniform rate, avoiding local differences in cooling effect caused by refrigerant temperature fluctuations. For example, in a cold storage, if the refrigerant temperature is stable, then the goods in various locations in the warehouse can be cooled more evenly, and there will be no situation where the temperature in some areas is too low and the temperature in some areas is too high. In addition, in the evaporator, the stable refrigerant temperature helps to form uniform fluid flow and heat exchange conditions. The flow and evaporation process of the refrigerant in the evaporator is smoother, and it can more fully exchange heat with the surrounding medium (such as air or water), thereby ensuring a more uniform temperature distribution across the entire heat exchange surface.

[0028] In the embodiment of the present application, the battery cold plate 100 includes a flow channel plate 1 and a flat plate 2 .

[0029] The flow channel plate 1 is provided with a liquid flow channel, and the refrigerant can flow in the liquid flow channel.

[0030] In addition, the flat plate 2 and the flow channel plate 1 can be connected together by welding. In this case, the surface of the flat plate 2 can close the liquid flow channel to limit the leakage of refrigerant from the liquid flow channel.

[0031] In addition, the liquid flow channel includes a liquid inlet flow channel 11 , a liquid outlet flow channel 12 , a pair of liquid separation flow channels 13 , a pair of circulation flow channels 14 , a pair of liquid converging flow channels 15 , a pair of liquid outlet parallel flow channels 16 and a pair of liquid outlet merging flow channels 17 .

[0032] Furthermore, a pair of liquid separation channels 13 are respectively disposed at two opposite ends of the liquid inlet channel 11 , and a pair of liquid outlet merging channels 17 are respectively disposed at two opposite ends of the liquid outlet channel 12 .

[0033] Specifically, the refrigerant in any circulation flow channel 14 may be merged into a corresponding liquid converging flow channel 15 and then diverted to a corresponding liquid outlet parallel flow channel 16 .

[0034] It should be noted that each liquid separation channel 13 includes at least two liquid inlet branch channels 131 connected in parallel to reduce pressure drop; each circulation channel 14 includes at least two sub-circulation channels 141 connected in parallel to reduce pressure drop; each liquid inlet branch channel 131 is connected to at least one sub-circulation channel 141.

[0035] It can be understood that each liquid outlet parallel flow channel 16 includes at least two mutually parallel dryness balancing flow channels 161, and each liquid outlet merging flow channel 17 includes at least two mutually parallel liquid outlet branch flow channels 171, and each liquid outlet branch flow channel 171 is connected to at least one dryness balancing flow channel 161.

[0036] In an embodiment of the present application, the mutually parallel liquid inlet branch flow channels 131 include but are not limited to the first liquid inlet flow channel 1311 and the second liquid inlet flow channel 1312, the mutually parallel sub-circulation flow channels 141 include but are not limited to the first sub-circulation flow channel 1411 and the second sub-circulation flow channel 1412, the mutually parallel dryness balancing flow channels 161 include but are not limited to the first balancing flow channel 1611 and the second balancing flow channel 1612, and the mutually parallel liquid outlet branch flow channels 171 include but are not limited to the first liquid outlet flow channel 1711 and the second liquid outlet flow channel 1712.

[0037] In an embodiment of the present application, the path length of the first liquid inlet channel 1311 is smaller than the path length of the second liquid inlet channel 1312, the path length of the first balancing channel 1611 is equal to the path length of the second balancing channel 1612, and the path length of the first liquid outlet channel 1711 is smaller than the path length of the second liquid outlet channel 1712.

[0038] Specifically, after the refrigerant enters the flow channel inlet through the liquid inlet pipe 301, it enters the first liquid inlet flow channel 1311 and the second liquid inlet flow channel 1312 which are symmetrical on the left and right respectively. The first liquid inlet flow channel 1311 and the second liquid inlet flow channel 1312 connected in parallel with each other can reduce the pressure drop, which is conducive to improving the temperature uniformity.

[0039] Generally speaking, the temperature of the refrigerant in the saturated state is related to the pressure drop. Usually, the smaller the pressure drop, the smaller the temperature difference of the refrigerant itself, which is conducive to improving temperature uniformity.

[0040] In the embodiment of the present application, the liquid flows through the left-right symmetrical first liquid outlet channel 1711 and the second liquid outlet channel 1712 and converges into the liquid outlet channel 12 , and finally flows out from the channel outlet 121 into the liquid outlet pipe of the inlet and outlet joint 3 .

[0041] In some embodiments, as Figure 5 As shown, one group of liquid separation channels 13 of a pair of liquid separation channels 13, one group of circulation channels 14 of a pair of circulation channels 14, one of the liquid converging channels 15 of a pair of liquid converging channels 15, one group of liquid outlet parallel channels 16 of a pair of liquid outlet parallel channels 16 and one group of liquid outlet merging channels 17 of a pair of liquid outlet merging channels 17 are connected in sequence to form a first cooling circuit.

[0042] It should be noted that the other group of liquid separation channels 13 of the pair of liquid separation channels 13, the other group of circulation channels 14 of the pair of circulation channels 14, the other group of liquid converging channels 15 of the pair of liquid converging channels 15, the other group of liquid outlet parallel channels 16 of the pair of liquid outlet parallel channels 16 and the other group of liquid outlet merging channels 17 of the pair of liquid outlet merging channels 17 are connected in sequence to form a second cooling circuit.

[0043] In some embodiments, a channel inlet 111 is provided at a middle position of the liquid inlet channel 11 , and a channel outlet 121 is provided at a middle position of the liquid outlet channel 12 .

[0044] It can be understood that the refrigerant flows in the first cooling circuit and the second cooling circuit both from the flow channel inlet 111 and out from the flow channel outlet 121 .

[0045] In some embodiments, combined Figure 1 、 Figure 2 and Figure 5 It can be seen that a pair of circulation channels 14, a pair of liquid converging channels 15 and a pair of liquid outlet parallel channels 16 together enclose a cooling area 101, and the battery module 200 is in contact with the surface of the flat plate 2 facing away from the channel plate 1 through thermal conductive glue, and the assembly position of the battery module 200 corresponds to the cooling area 101.

[0046] It should be noted that the thermal conductive adhesive allows the battery module 200 to be in close contact with the surface of the flat plate 2 , so as to achieve good heat conduction between the battery module 200 and the battery cold plate 100 .

[0047] In some embodiments, according to Figure 3 and Figure 4It can be seen that the plate 2 has a first surface and a second surface opposite to each other in its thickness direction, and a main inlet 201 and a main outlet 202 penetrating the first surface and the second surface are provided at a middle position of the plate 2 near its edge.

[0048] Specifically, the flow channel plate 1 is fixed on the first surface of the flat plate 2 , the main inlet 201 is connected to the flow channel inlet 111 , and the main outlet 202 is connected to the flow channel outlet 121 .

[0049] In some embodiments, Figure 2-Figure 3 It can be seen that the battery cold plate 100 further includes an inlet and outlet connector 3 .

[0050] The inlet and outlet joint 3 has a liquid inlet pipe 301 and a liquid outlet pipe 302 . The inlet and outlet joint 3 can be welded to the second surface of the plate 2 , and is located in the middle position of the plate in a bilaterally symmetrical manner.

[0051] In addition, the liquid inlet pipe 301 is connected to the main inlet 201 so that the refrigerant flows into the liquid inlet channel 11 from the liquid inlet pipe 301 .

[0052] In addition, the liquid outlet pipe 302 is connected to the main outlet 202 so that the refrigerant flows out from the liquid outlet channel 12 to the liquid outlet pipe 302 .

[0053] In some embodiments, see Figure 5 and Figure 6 , any sub-circulation channel 141 in each circulation channel 14 is S-shaped. At this time, the path length of the first sub-circulation channel 1411 is smaller than the path length of the second sub-circulation channel 1412, so that the cooling area in contact with the battery module 200 is different, resulting in different refrigerant dryness in the first sub-circulation channel 1411 and the second sub-circulation channel 1412. Therefore, the battery cold plate 100 merges the refrigerants in the first sub-circulation channel 1411 and the second sub-circulation channel 1412 into the corresponding liquid confluence channel, mixes the dryness of the refrigerants, and then divides them into the first balancing channel 1611 and the second balancing channel 1612. This design can keep the flow rate and dryness in the first balancing channel 1611 and the second balancing channel 1612 the same, thereby avoiding the situation in which the refrigerant in the battery cold plate 100 evaporates due to too little flow or too high dryness, thereby facilitating improved temperature uniformity.

[0054] Specifically, refrigerant dryness refers to the mass proportion of saturated vapor in wet steam, that is, the ratio of the mass of the gas phase in wet steam to the total mass of the mixture.

[0055] In some embodiments, as Figure 2 and Figure 3 As shown, the battery cold plate 100 further includes a support beam 4 .

[0056] The support beam 4 is fixedly mounted on the second surface of the flat plate 2 , and the battery module 200 can be welded to the support beam 4 .

[0057] In addition, the heat of the battery module 200 can be transferred to the second surface of the flat plate 2 through the thermal conductive adhesive and carried away by the refrigerant flowing in the cooling area 101 .

[0058] In some embodiments, combined Figure 2 、 Figure 3 and Figure 5 It can be seen that the end of any circulation channel 14 connected to its corresponding branch channel 13 is close to its corresponding liquid outlet parallel channel 16, which can reduce the temperature difference between the inlet and outlet sections and improve the temperature uniformity of the battery cold plate 100.

[0059] See also Figures 1-6 The battery module 200 includes: a plurality of battery cells 2001 , a battery cell bracket 2002 and an end plate 2003 .

[0060] Specifically, a plurality of battery cells 2001 are arranged on the battery cell support 2002 in a predetermined manner, and the end plates 2003 are disposed on two opposite sides of the battery cell support 2002 .

[0061] In the embodiment of the present application, the battery cell holder 2002 can be fixed to the support beam 4 of the battery cold plate 100 through the end plate 2003 , and the heat generated by the plurality of battery cells 2001 can be cooled by the battery cold plate 100 .

[0062] In summary, the battery cold plate and battery module provided by the embodiments of the present application. The battery cold plate includes a flow channel plate and a flat plate. The flow channel is provided with a liquid flow channel, and the refrigerant can flow in the liquid flow channel. The flat plate and the flow channel plate are connected to each other. At this time, the surface of the flat plate can close the liquid flow channel to limit the leakage of the refrigerant from the liquid flow channel. The above-mentioned liquid flow channel includes a liquid inlet channel, a liquid outlet channel, a pair of liquid separation channels, a pair of circulation channels, a pair of liquid converging channels, a pair of parallel liquid outlet channels and a pair of liquid outlet merging channels. A pair of liquid separation channels are respectively arranged at the opposite ends of the liquid inlet channel, and a pair of liquid outlet merging channels are respectively arranged at the opposite ends of the liquid outlet channel. The refrigerant in any circulation channel can be merged into a corresponding liquid converging channel. And it is diverted to the corresponding parallel liquid outlet flow channels, each liquid diversion flow channel includes at least two mutually parallel liquid inlet branch flow channels, each circulation flow channel includes at least two mutually parallel sub-circulation flow channels, and each liquid inlet branch flow channel is connected to at least one sub-circulation flow channel, each liquid outlet parallel flow channel includes at least two mutually parallel dryness balancing flow channels, each liquid outlet merging flow channel includes at least two mutually parallel liquid outlet branch flow channels, and each liquid outlet branch flow channel is connected to at least one dryness balancing flow channel; through the above-mentioned structural design, the battery cold plate has better temperature uniformity, thereby improving the heat dissipation effect of the battery cold plate on the battery module. Therefore, the battery cold plate and battery module provided in the embodiment of the present application have certain novelties compared with traditional battery cold plates and battery modules.

[0063] The above content is a further detailed description of the present application in conjunction with specific / preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present application.

Claims

1. A battery cold plate, used in conjunction with a refrigerant to cool a battery module, characterized in that: include: A flow channel plate, on which a liquid flow channel is formed, and the refrigerant can flow in the liquid flow channel; a flat plate connected to the flow channel plate, wherein the surface of the flat plate can close the liquid flow channel to limit leakage of the refrigerant from the liquid flow channel; The liquid flow channel includes a liquid inlet flow channel, a liquid outlet flow channel, a pair of liquid separation flow channels, a pair of circulation flow channels, a pair of liquid converging flow channels, a pair of liquid outlet parallel flow channels and a pair of liquid outlet merging flow channels; A pair of liquid separation channels are respectively arranged at two opposite ends of the liquid inlet channel, and a pair of liquid outlet merging channels are respectively arranged at two opposite ends of the liquid outlet channel; The refrigerant in any of the circulation channels can be collected into a corresponding liquid converging channel and then divided into a corresponding liquid discharging parallel channel; Each of the liquid separation channels includes at least two liquid inlet branch channels connected in parallel, each of the circulation channels includes at least two sub-circulation channels connected in parallel, and each of the liquid inlet branch channels is connected to at least one of the sub-circulation channels; Each of the parallel liquid outlet flow channels includes at least two mutually parallel dryness balancing flow channels, each of the liquid outlet merging flow channels includes at least two mutually parallel liquid outlet branch flow channels, and each of the liquid outlet branch flow channels is connected to at least one of the dryness balancing flow channels.

2. The battery cold plate according to claim 1, characterized in that: One group of liquid-splitting flow channels of the pair of liquid-splitting flow channels, one group of circulating flow channels of the pair of circulating flow channels, one of the converging flow channels of the pair of liquid-converging flow channels, one group of liquid-discharging parallel flow channels of the pair of liquid-discharging parallel flow channels, and one group of liquid-discharging merging flow channels of the pair of liquid-discharging merging flow channels are sequentially connected to form a first cooling circuit; Another group of liquid separation channels of the pair of said liquid separation channels, another group of circulation channels of the pair of said circulation channels, another liquid converging channel of the pair of said liquid converging channels, another group of liquid outlet parallel channels of the pair of said liquid outlet parallel channels and another group of liquid outlet merging channels of the pair of said liquid outlet merging channels are connected in sequence to form a second cooling circuit.

3. The battery cold plate according to claim 2, characterized in that: A flow channel inlet is provided at the middle position of the liquid inlet flow channel, and a flow channel outlet is provided at the middle position of the liquid outlet flow channel; The refrigerant flows in the first cooling circuit and the second cooling circuit both from the flow channel inlet and out from the flow channel outlet.

4. The battery cold plate according to claim 3, characterized in that: A pair of the circulation channels, a pair of the liquid converging channels, and a pair of the liquid discharging parallel channels together enclose a cooling area. The battery module is in contact with the surface of the flat plate facing away from the channel plate through thermal conductive glue, and the assembly position of the battery module corresponds to the cooling area.

5. The battery cold plate according to claim 4, characterized in that: The plate has a first surface and a second surface opposite to each other in the thickness direction, and a main inlet and a main outlet penetrating the first surface and the second surface are provided at a middle position of the plate near an edge thereof; The flow channel plate is fixed on the first surface of the flat plate, the main inlet is connected to the flow channel inlet, and the main outlet is connected to the flow channel outlet.

6. The battery cold plate according to claim 5, characterized in that: Also includes: an inlet and outlet joint having a liquid inlet pipe and a liquid outlet pipe, and the inlet and outlet joint is fixed to the second surface of the plate; The liquid inlet pipe is connected to the main inlet, so that the refrigerant flows from the liquid inlet pipe into the liquid inlet flow channel; The liquid outlet pipe is communicated with the main outlet so that the refrigerant flows out from the liquid outlet channel to the liquid outlet pipe.

7. The battery cold plate according to claim 1, characterized in that: Any one of the sub-circulation channels in each of the circulation channels is S-shaped.

8. The battery cold plate according to claim 5, characterized in that: Also includes: A support beam is fixedly mounted on the second surface of the flat plate, and the battery module is fixedly assembled on the support beam; The heat of the battery module can be transferred to the second surface of the flat plate through the thermal conductive adhesive and carried away by the refrigerant flowing in the cooling area.

9. The battery cold plate according to claim 1, characterized in that: One end of any of the circulation channels connected to its corresponding branch channel is close to its corresponding liquid outlet parallel channel.

10. A battery module, characterized in that: include: Several battery cells, battery cell brackets and end plates; A plurality of the battery cells are arranged on the battery cell holder in a preset manner, and the end plates are provided on opposite sides of the battery cell holder; The battery cell bracket can be fixed to the support beam of the battery cold plate according to any one of claims 1 to 9 through the end plate, and the heat generated by the plurality of battery cells can be cooled by the battery cold plate.

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