Battery assembly and lithium-ion battery

Abstract

The application provides a battery assembly and a lithium ion battery. The battery assembly comprises a plurality of single batteries and a liquid cooling plate. The plurality of single batteries are arranged side by side, and the liquid cooling plate is located between adjacent single batteries. The liquid cooling plate has a heat dissipation flow channel inside. The heat dissipation flow channel comprises an inlet flow channel, a plurality of first sub-flow channels, a plurality of second sub-flow channels, a first outlet flow channel and a second outlet flow channel. The first outlet flow channel and the second outlet flow channel are respectively located on the two sides of the inlet flow channel. The first sub-flow channels connect the inlet flow channel and the first outlet flow channel. The second sub-flow channels connect the inlet flow channel and the second outlet flow channel. The application makes the inlet flow channel, the plurality of first sub-flow channels, the plurality of second sub-flow channels, the first outlet flow channel and the second outlet flow channel form a fishbone-shaped heat dissipation flow channel. The cooling liquid can fully reach each area of the heat dissipation flow channel, significantly improves the uniformity of the distribution of the cooling liquid in the liquid cooling plate, and effectively improves the consistency of the temperature between the single batteries.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery assembly and a lithium ion battery. BACKGROUND

[0002] At present, during the discharging process of the battery, especially during the high-rate discharging, the battery will release a large amount of heat. In view of the heat release phenomenon in the discharging process of the battery, according to the heat dissipation medium of the battery thermal management system, the common battery cooling methods for the battery pack can be mainly divided into air cooling, liquid cooling and phase change cooling. The air cooling system has simple structure and low cost, but the viscosity of air is low, the thermal conductivity coefficient is small, and the heat that can be taken away by air cooling is less, so it is difficult to meet the heat dissipation requirements of the battery pack under high-rate discharging. The phase change material cooling has high heat exchange efficiency and can effectively take away heat, but the cost is high and the technology is not mature, which limits its practical application. The liquid cooling has higher thermal conductivity and specific heat capacity, and the heat dissipation effect is stronger, so it is more suitable to use the liquid cooling system for cooling in the engineering application under the condition of high-rate discharging of the battery pack. However, the above-mentioned battery cooling methods usually have the problem of uneven heat dissipation, so that there is a temperature difference between the single batteries in the battery pack, thereby causing the performance of the battery to decrease.

[0003] Taking the lithium ion battery as an example, the performance of the lithium ion battery is very sensitive to temperature, and too high temperature will affect the service life and safety performance of the battery. Research shows that the best working temperature range of the lithium ion battery is between 20℃ and 40℃. The lithium ion battery pack is composed of a plurality of lithium ion battery single bodies in different series and parallel forms, the lithium ion battery single bodies are arranged closely in the battery pack, and the spacing between the adjacent single batteries is small. When the lithium ion battery is discharged at a high rate, the heat generated by the lithium ion battery accumulates in a short time, which is easy to exceed the best working temperature range. If the heat generated by the battery during the high-rate discharging process cannot be discharged in time, the overall temperature of the battery pack will rise, and in severe cases, it may even cause fire and explosion accidents. At the same time, if the heat generated by the battery during the discharging process cannot be discharged in time, the accumulated heat will also increase the temperature difference between the single batteries, thereby destroying the consistency of the battery temperature of the battery pack, and causing the overall working performance of the battery pack to decrease. SUMMARY

[0004] The present application provides a battery assembly and a lithium ion battery, which aims to solve the technical problem of poor heat dissipation effect of the current battery pack.

[0005] In a first aspect, the present application provides a battery assembly, comprising:

[0006] a plurality of single batteries, the plurality of single batteries are arranged side by side;

[0007] a liquid cooling plate, the liquid cooling plate is located between adjacent single batteries, and the liquid cooling plate has a heat dissipation flow channel inside;

[0008] The heat dissipation flow channel comprises an inlet flow channel, a plurality of first sub-flow channels, a plurality of second sub-flow channels, a first outlet flow channel and a second outlet flow channel, and the first outlet flow channel and the second outlet flow channel are respectively located on both sides of the inlet flow channel;

[0009] The inlet flow channel is arranged along the center line of the liquid cooling plate, and the first outlet flow channel and the second outlet flow channel are respectively arranged adjacent to the length edges on both sides of the liquid cooling plate;

[0010] The plurality of first sub-flow channels are sequentially arranged between the inlet flow channel and the first outlet flow channel, and the first sub-flow channels are communicated with the inlet flow channel and the first outlet flow channel; and the plurality of second sub-flow channels are sequentially arranged between the inlet flow channel and the second outlet flow channel, and the second sub-flow channels are communicated with the inlet flow channel and the second outlet flow channel.

[0011] In some embodiments, a heat-conducting silica gel sheet is arranged between the liquid cooling plate and the single battery;

[0012] One side of the heat-conducting silica gel sheet is attached to the liquid cooling plate, and the other side is attached to the single battery.

[0013] In some embodiments, the thickness of the heat-conducting silica gel sheet gradually increases along the flow direction of the fluid in the inlet flow channel.

[0014] In some embodiments, the liquid cooling plate comprises a base plate and a cover plate, the cover plate is attached to the base plate, one side of the base plate facing the cover plate has a sink, and a plurality of first fishbone protrusions and a plurality of second fishbone protrusions are arranged in the sink;

[0015] The plurality of first fishbone protrusions and the plurality of second fishbone protrusions are symmetrically arranged with respect to the center line of the base plate, and the plurality of first fishbone protrusions and the plurality of second fishbone protrusions define the inlet flow channel therebetween;

[0016] The plurality of first fishbone protrusions are sequentially arranged along the length direction of the base plate, and the first sub-flow channels are defined between adjacent first fishbone protrusions; and the plurality of first fishbone protrusions and the side wall adjacent to the sink define the first outlet flow channel.

[0017] The plurality of second fishbone protrusions are sequentially arranged along the length direction of the base plate, and the second sub-flow channels are defined between adjacent second fishbone protrusions; and the plurality of second fishbone protrusions and the side wall adjacent to the sink define the second outlet flow channel.

[0018] In some embodiments, an inflow notch is arranged at one side edge of the base plate, and a first outflow notch and a second outflow notch are arranged at the other side edge;

[0019] The inflow notch is communicated with the inlet flow channel, the first outflow notch is communicated with the first outlet flow channel, and the second outflow notch is communicated with the second outlet flow channel.

[0020] In some embodiments, the inlet flow channel comprises an initial flow section, a middle flow section and a final flow section, and the initial flow section, the middle flow section and the final flow section each divide the inlet flow channel;

[0021] The first preset angle of the first sub-flow channel corresponding to the initial flow section, the second preset angle of the first sub-flow channel corresponding to the middle flow section, and the third preset angle of the first sub-flow channel corresponding to the final flow section satisfy the following relationship:

[0022] The first preset angle, the second preset angle and the third preset angle satisfy the following relationship:

[0023] θ1=θ3+10°

[0024] θ2=θ3+5°

[0025] Wherein, θ1 is the first preset angle, θ2 is the second preset angle, and θ3 is the third preset angle.

[0026] In some embodiments, the third preset angle is greater than or equal to 60° and less than or equal to 70°.

[0027] In some embodiments, the first sub-flow channel corresponding to the initial flow section has a first preset width, the first sub-flow channel corresponding to the middle flow section has a second preset width, and the first sub-flow channel corresponding to the final flow section has a third preset width.

[0028] The first preset width, the second preset width and the third preset width satisfy the following relationship:

[0029] D2=D1+1mm

[0030] D3=D1+3mm

[0031] Wherein, D1 is the first preset width, D2 is the second preset width, and D3 is the third preset width.

[0032] In some embodiments, the first preset width is greater than or equal to 4mm and less than or equal to 7mm.

[0033] In some embodiments, along the flow direction of the fluid in the inlet flow channel, the width of the first sub-flow channel and the second sub-flow channel gradually increases; and / or

[0034] Along the flow direction of the fluid in the inlet flow channel, the inclination angle of the first sub-flow channel and the second sub-flow channel relative to the inlet flow channel gradually decreases.

[0035] In some embodiments, the width of the first outlet flow channel is equal to the width of the second outlet flow channel, and the width ratio of the first outlet flow channel or the second outlet flow channel to the inlet flow channel is 1:1-2:1.

[0036] In some embodiments, the width of the inlet flow channel is 6-12 mm, and the width of the first outlet flow channel or the second outlet flow channel is 6-12 mm.

[0037] In some embodiments, the width of the first sub-flow channel and the width of the second sub-flow channel are both 4-10 mm.

[0038] In some embodiments, the depth of the heat dissipation flow channel is 1-4 mm.

[0039] In a second aspect, the application provides a lithium ion battery comprising the battery assembly as described in the first aspect.

[0040] The application sets a liquid cooling plate between adjacent single batteries, which has a heat dissipation flow channel inside. Since the first outlet flow channel and the second outlet flow channel of the heat dissipation flow channel are respectively located on both sides of the inlet flow channel, the first sub-flow channel connects the inlet flow channel with the first outlet flow channel, and the second sub-flow channel connects the inlet flow channel with the second outlet flow channel, so that the inlet flow channel, the plurality of first sub-flow channels, the plurality of second sub-flow channels, the first outlet flow channel and the second outlet flow channel form a fishbone-shaped heat dissipation flow channel. When the liquid cooling plate adjacent to the single batteries dissipates heat, the cooling liquid can fully reach each area of the heat dissipation flow channel, significantly improving the uniformity of the distribution of the cooling liquid in the liquid cooling plate, and effectively improving the consistency of the temperature between the single batteries. At the same time, the liquid cooling plate structure with the bionic fishbone flow channel between the single batteries can ensure that the maximum temperature of the battery is within the optimal temperature range during high-rate discharge of the battery pack, and can also improve the temperature uniformity between the batteries and reduce the energy consumption of the system. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0042] Figure 1 is a structural schematic diagram of the battery assembly provided in the embodiments of the application;

[0043] Figure 2 is an exploded schematic diagram of the battery assembly provided in the embodiments of the application;

[0044] Figure 3 is an exploded schematic diagram of the liquid cooling plate provided in the embodiments of the application;

[0045] Figure 4 is a top view of the heat dissipation flow channel inside the liquid cooling plate provided in the embodiments of the application.

[0046] Wherein, 10 monomer battery, 20 liquid cooling plate, 21 heat dissipation flow channel, 211 inlet flow channel, 2111 flow initial section, 2112 flow middle section, 2113 flow end section, 212 first branch flow channel, 213 second branch flow channel, 214 first outlet flow channel, 215 second outlet flow channel;

[0047] 201 base plate, 2011 sink, 2012 first fishbone protrusion, 2013 second fishbone protrusion, 2014 inflow notch, 2015 first outflow notch, 2016 second outflow notch, 202 cover plate;

[0048] 30 heat-conducting silica gel sheet. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0050] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0051] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. For purposes of explanation, specific details are set forth in order to provide a thorough understanding of the application. It will be apparent to one skilled in the art, however, that the application can be practiced without the specific details presented herein. In other instances, well known structures and processes are not elaborated in order to avoid obscuring the subject matter of this application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features presented herein.

[0052] The battery assembly and the lithium ion battery are described in detail as follows.

[0053] First, refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 Fig. 1 shows a structural schematic diagram of the battery assembly in the embodiments of the present application, Figure 2 Fig. 2 shows an exploded schematic diagram of the battery assembly in the embodiments of the present application, Figure 3 Fig. 3 shows an exploded schematic diagram of the liquid cooling plate 20 in the embodiments of the present application, wherein the battery assembly comprises:

[0054] a plurality of single batteries 10, the plurality of single batteries 10 being arranged side by side;

[0055] a liquid cooling plate 20, the liquid cooling plate 20 being located between adjacent single batteries 10, and the liquid cooling plate 20 having a heat dissipation flow channel 21 inside;

[0056] wherein the heat dissipation flow channel 21 comprises an inlet flow channel 211, a plurality of first sub-flow channels 212, a plurality of second sub-flow channels 213, a first outlet flow channel 214, and a second outlet flow channel 215, the first outlet flow channel 214 and the second outlet flow channel 215 being respectively located on both sides of the inlet flow channel 211;

[0057] the inlet flow channel 211 being arranged along the center line of the liquid cooling plate 20, and the first outlet flow channel 214 and the second outlet flow channel 215 being respectively arranged adjacent to the length edges on both sides of the liquid cooling plate 20;

[0058] the plurality of first sub-flow channels 212 being sequentially arranged between the inlet flow channel 211 and the first outlet flow channel 214, and the first sub-flow channels 212 being in communication with the inlet flow channel 211 and the first outlet flow channel 214, and the plurality of second sub-flow channels 213 being sequentially arranged between the inlet flow channel 211 and the second outlet flow channel 215, and the second sub-flow channels 213 being in communication with the inlet flow channel 211 and the second outlet flow channel 215.

[0059] Specifically, the plurality of single batteries 10 can be connected in series and / or in parallel to form a battery pack, thereby increasing the electrical energy accumulated by the battery assembly. Exemplarily, the single battery 10 can be a lithium battery, a zinc-manganese battery, or a cadmium-nickel battery, etc. Generally, the shape of the single battery 10 is approximately cuboid, and the adjacent side area between the plurality of single batteries 10 is maximized when the plurality of single batteries 10 are arranged, so as to reduce the space occupied by the plurality of single batteries 10 arranged side by side. Understandably, the single battery 10 can also be other shapes, such as a regular polygonal cube, and the bottom surface and the top surface of the adjacent single batteries 10 are adjacent to each other when the plurality of single batteries 10 are arranged.

[0060] The liquid cooling plate 20 reduces the temperature of the single battery 10 by passing the cooling liquid into the heat dissipation flow channel 21 inside the liquid cooling plate 20, so that the heat of the single battery 10 is absorbed by the cooling liquid to transfer to the liquid cooling plate 20, thereby ensuring that the single battery 10 works within the optimal working temperature range. In some embodiments of the present application, the liquid cooling plate 20 can be directly attached to the single battery 10, so that the single battery 10 directly transfers its heat to the liquid cooling plate 20. In some other embodiments of the present application, a heat-conducting silica gel sheet 30 is arranged between the liquid cooling plate 20 and the single battery 10, one side of the heat-conducting silica gel sheet 30 is attached to the liquid cooling plate 20, and the other side is attached to the single battery 10. In one aspect, since the heat-conducting silica gel sheet 30 has heat conductivity and a certain degree of flexibility, it can be well attached to the surface of the liquid cooling plate 20 and the single battery 10, thereby maximizing the filling of the contact gap between the single battery 10 and the liquid cooling plate 20, reducing the contact thermal resistance of the surface of the single battery 10 and the liquid cooling plate 20, and achieving heat transfer between the heat generating part and the heat dissipating part, thereby achieving the best heat conduction and heat dissipation purposes. On the other hand, the heat-conducting silica gel sheet 30 also has a certain degree of elasticity and insulation, which can offset the effects of the expansion of the single battery 10 and the deformation of the liquid cooling plate 20, and play the roles of buffering, rebounding, shock absorption, and insulation, etc.

[0061] The heat dissipation flow channel 21 of the liquid cooling plate 20 includes an inlet flow channel 211, a plurality of first sub-flow channels 212, a plurality of second sub-flow channels 213, a first outlet flow channel 214, and a second outlet flow channel 215, and the first outlet flow channel 214 and the second outlet flow channel 215 are respectively located on both sides of the inlet flow channel 211, that is, the inlet flow channel 211 is located between the first outlet flow channel 214 and the second outlet flow channel 215. In some embodiments of the present application, the first outlet flow channel 214 and the second outlet flow channel 215 are respectively arranged symmetrically with respect to the inlet flow channel 211, and the inlet flow channel 211, the first outlet flow channel 214, and the second outlet flow channel 215 are comparable in length to the liquid cooling plate 20, so that the inlet flow channel 211, the first outlet flow channel 214, and the second outlet flow channel 215 can extend from one end of the liquid cooling plate 20 to the other end, so as to facilitate the cooling liquid in the heat dissipation flow channel 21 to flow from one end of the liquid cooling plate 20 to the other end.

[0062] More specifically, the inlet flow channel 211 is arranged along the center line of the liquid cooling plate 20, and the first outlet flow channel 214 and the second outlet flow channel 215 are arranged adjacent to the length edges on both sides of the liquid cooling plate 20, respectively. When the cooling liquid flows into the first outlet flow channel 214 and the second outlet flow channel 215 from the inlet flow channel 211, the flow direction of the cooling liquid is along the width direction of the liquid cooling plate 20. In combination with the embodiment in which the length of the inlet flow channel 211, the first outlet flow channel 214 and the second outlet flow channel 215 is equivalent to the length of the liquid cooling plate 20, the cooling liquid in the cooling flow channel can flow along the length direction and the width direction of the liquid cooling plate 20, and then the cooling liquid is uniformly dispersed into the entire liquid cooling plate 20, thereby ensuring the uniformity of the distribution of the cooling liquid in the liquid cooling plate 20.

[0063] A plurality of first sub-flow channels 212 are arranged between the inlet flow channel 211 and the first outlet flow channel 214 in sequence, so that the first sub-flow channels 212 communicate the inlet flow channel 211 and the first outlet flow channel 214, and a plurality of second sub-flow channels 213 are arranged between the inlet flow channel 211 and the second outlet flow channel 215 in sequence, so that the second sub-flow channels 213 communicate the inlet flow channel 211 and the second outlet flow channel 215. In some embodiments of the present application, the plurality of first sub-flow channels 212 and the plurality of second sub-flow channels 213 are symmetrically arranged with respect to the inlet flow channel 211.

[0064] More specifically, the plurality of first sub-flow channels 212 are arranged between the inlet flow channel 211 and the first outlet flow channel 214 in sequence along the length direction of the liquid cooling plate 20, and the first sub-flow channels 212 are substantially parallel to the width direction of the liquid cooling plate 20; the plurality of second sub-flow channels 213 are also arranged between the inlet flow channel 211 and the second outlet flow channel 215 in sequence along the length direction of the liquid cooling plate 20, and the second sub-flow channels 213 are substantially parallel to the width direction of the liquid cooling plate 20, so that the inlet flow channel 211, the plurality of first sub-flow channels 212, the plurality of second sub-flow channels 213, the first outlet flow channel 214 and the second outlet flow channel 215 form a fishbone-shaped cooling flow channel 21, so that the cooling liquid can fully reach each area of the cooling flow channel 21, and the uniformity of the distribution of the cooling liquid in the cooling flow channel 21 of the liquid cooling plate 20 is ensured.

[0065] It should be noted that, generally, the inlet flow channel 211, the first sub-flow channel 212, the second sub-flow channel 213, the first outlet flow channel 214 and the second outlet flow channel 215 are straight flow channel structures. In fact, the inlet flow channel 211, the first sub-flow channel 212, the second sub-flow channel 213, the first outlet flow channel 214 and the second outlet flow channel 215 can also be serpentine (wavy) flow channel structures, for example, the inlet flow channel 211, the first outlet flow channel 214 and the second outlet flow channel 215 are serpentine flow channel structures extending along the length direction of the liquid cooling plate.

[0066] In some embodiments of the present application, the width of the first outlet flow channel 214 is equal to the width of the second outlet flow channel 215, and the width ratio of the first outlet flow channel 214 or the second outlet flow channel 215 to the inlet flow channel 211 is between 1:1 and 2:1. Preferably, the width ratio of the first outlet flow channel 214 and the second outlet flow channel 215 to the inlet flow channel 211 is 2:1.

[0067] In some embodiments of the present application, the width of the inlet flow channel 211 is 6-12 mm, and the width of the first outlet flow channel 214 or the second outlet flow channel 215 is 6-12 mm. Preferably, the width of the inlet flow channel 211 is 12 mm, and the width of the first outlet flow channel 214 and the second outlet flow channel 215 is 6 mm.

[0068] In some embodiments of the present application, the width of the first flow channel 212 and the width of the second flow channel 213 are both 4-10 mm, the distance between adjacent first flow channels 212 is 6-8 mm, and the distance between adjacent second flow channels 213 is 6-8 mm.

[0069] In some embodiments of the present application, the depth of the heat dissipation flow channel 21 is 1-4 mm.

[0070] In the embodiments of the present application, the present application sets a liquid cooling plate 20 between adjacent single batteries 10, the liquid cooling plate 20 has a heat dissipation flow channel 21 inside, and the heat dissipation flow channel 21 is composed of an inlet flow channel 211, a plurality of first flow channels 212, a plurality of second flow channels 213, a first outlet flow channel 214, and a second outlet flow channel 215. When the liquid cooling plate 20 dissipates heat from adjacent single batteries 10, the cooling liquid can fully reach each area of the heat dissipation flow channel 21, significantly improving the uniformity of the distribution of the cooling liquid in the liquid cooling plate 20, and effectively improving the temperature consistency between the single batteries 10. At the same time, the liquid cooling plate 20 structure with the bionic fishbone flow channel between the single batteries 10 can ensure that the maximum temperature of the battery is within the optimal temperature range during high-rate discharge of the battery pack, while improving the temperature uniformity between the batteries and reducing the energy consumption of the system.

[0071] In some embodiments of the present application, for example, for embodiments in which a heat-conducting silica gel sheet 30 is arranged between the liquid cooling plate 20 and the single battery 10, the thickness of the heat-conducting silica gel sheet 30 gradually increases along the flow direction of the fluid in the inlet flow channel 211.

[0072] It should be noted that, due to the uneven pressure of the internal heat dissipation flow channel 21 of the liquid cooling plate 20, the liquid cooling plate 20 expands and deforms inconsistently due to the internal pressure. Specifically, the pressure of the liquid cooling plate 20 corresponding to the cooling liquid inflow of the heat dissipation flow channel 21 is relatively large, so that the expansion and deformation of the liquid cooling plate 20 at the cooling liquid inflow is relatively large. The pressure of the liquid cooling plate 20 corresponding to the cooling liquid outflow of the heat dissipation flow channel 21 is relatively small, so that the expansion and deformation of the liquid cooling plate 20 at the cooling liquid outflow is relatively small.

[0073] In the above embodiment, the thickness of the heat-conducting silicone sheet 30 is gradually increased along the flow direction of the fluid in the inlet flow channel 211. The thickness of the heat-conducting silicone sheet 30 is thinner at the cooling liquid inflow of the liquid cooling plate 20 corresponding to the heat dissipation flow channel 21, and the thickness of the heat-conducting silicone sheet 30 is thicker at the cooling liquid outflow of the liquid cooling plate 20 corresponding to the heat dissipation flow channel 21. This makes the thickness design of the heat-conducting silicone sheet 30 adapt to the expansion and deformation of the liquid cooling plate 20, that is, the thickness of the heat-conducting silicone sheet 30 is thinner at the relatively large expansion and deformation of the liquid cooling plate 20, and the thickness of the heat-conducting silicone sheet 30 is thicker at the relatively small expansion and deformation of the liquid cooling plate 20. In this way, the contact pressure between the heat-conducting silicone sheet 30 and the liquid cooling plate 20 and the monomer battery 10 can be made relatively uniform, and the liquid cooling plate 20 can be better attached to the surface of the liquid cooling plate 20 and the monomer battery 10, avoiding the phenomenon that the heat-conducting silicone sheet 30 corresponding to the cooling liquid inflow of the liquid cooling plate 20 is subjected to relatively large pressure and has good heat conduction, while the heat-conducting silicone sheet 30 corresponding to the cooling liquid outflow of the liquid cooling plate 20 is subjected to relatively small pressure and has poor heat conduction.

[0074] As an exemplary structure of a liquid cooling plate 20, please continue to refer to Figure 3 The liquid cooling plate 20 includes a mother plate 201 and a cover plate 202. The cover plate 202 is attached to the mother plate 201. The side of the mother plate 201 facing the cover plate 202 has a sink 2011. A plurality of first fishbone protrusions 2012 and a plurality of second fishbone protrusions 2013 are arranged in the sink 2011. The plurality of first fishbone protrusions 2012 and the plurality of second fishbone protrusions 2013 are symmetrically arranged with respect to the center line of the mother plate 201. The plurality of first fishbone protrusions 2012 and the plurality of second fishbone protrusions 2013 define an inlet flow channel 211. The plurality of first fishbone protrusions 2012 are arranged in sequence along the length direction of the mother plate 201. Adjacent first fishbone protrusions 2012 define a first sub-flow channel 212. The side wall adjacent to the plurality of first fishbone protrusions 2012 and the sink 2011 defines a first outlet flow channel 214. The plurality of second fishbone protrusions 2013 are arranged in sequence along the length direction of the mother plate 201. Adjacent second fishbone protrusions 2013 define a second sub-flow channel 213. The side wall adjacent to the plurality of second fishbone protrusions 2013 and the sink 2011 defines a second outlet flow channel 215.

[0075] In the above embodiments, the base plate 201 and the cover plate 202 can be combined together by welding or bolt connection, etc. The sink 2011 in the base plate 201 can be formed by punching or milling, and at the same time of milling or punching, the first fishbone protrusions 2012 and the second fishbone protrusions 2013 are formed in the sink 2011, so that the first fishbone protrusions 2012 and the second fishbone protrusions 2013 form the inlet flow channel 211, the first branch flow channel 212, the second branch flow channel 213, the first outlet flow channel 214 and the second outlet flow channel 215 of the heat dissipation flow channel 21 with the side wall of the sink 2011.

[0076] It can be understood that the first fishbone protrusions 2012 and the second fishbone protrusions 2013 can also be fixed in the sink 2011 of the base plate 201 by welding or bolt connection.

[0077] It should be noted that the above-mentioned embodiment of the liquid cooling plate 20 composed of the base plate 201 and the cover plate 202 is only an exemplary embodiment, and in fact the liquid cooling plate 20 can also be formed by other ways, for example, by 3D printing to form an integrated liquid cooling plate 20 with the heat dissipation flow channel 21 inside; for example, by embedding copper pipes in aluminum plates to form a liquid cooling plate 20, and the heat dissipation flow channel 21 of the liquid cooling plate 20 is formed by the embedded pipes.

[0078] In some embodiments of the present application, for example, for the embodiment that the liquid cooling plate 20 includes the base plate 201 and the cover plate 202, continue to refer to Figure 3 , wherein the one side edge of the base plate 201 is provided with an inflow notch 2014, and the other side edge is provided with a first outflow notch 2015 and a second outflow notch 2016. The inflow notch 2014 is communicated with the inlet flow channel 211, the first outflow notch 2015 is communicated with the first outlet flow channel 214, and the second outflow notch 2016 is communicated with the second outlet flow channel 215. When the cover plate 202 is attached to the base plate 201, the inflow notch 2014 at one side edge of the base plate 201 forms an inlet of the cooling liquid to facilitate the cooling liquid to flow into the inlet flow channel 211; similarly, the first outflow notch 2015 and the second outflow notch 2016 at the other side edge of the base plate 201 form outlets of the cooling liquid to facilitate the cooling liquid that absorbs heat to flow out of the liquid cooling plate 20.

[0079] It can be understood that the inflow and outflow of the cooling liquid can also be realized by other ways, for example, a pipe is arranged at one end of the liquid cooling plate 20 to communicate with the inlet flow channel 211, and pipes are arranged at the other end of the liquid cooling plate 20 to respectively communicate with the first outlet flow channel 214 and the second outlet flow channel 215.

[0080] In some embodiments of the present application, refer to Figure 4 , Figure 4A top view of the heat dissipation flow channel 21 inside the liquid cooling plate 20 in the embodiment of the present application is shown, wherein the inlet flow channel 211 includes an initial flow section 2111, a middle flow section 2112 and a final flow section 2113, and the initial flow section 2111, the middle flow section 2112 and the final flow section 2113 all divide the inlet flow channel 211;

[0081] The first sub-flow channel 212 corresponding to the initial flow section 2111 forms a first preset angle with the inlet flow channel 211, the first sub-flow channel 212 corresponding to the middle flow section 2112 forms a second preset angle with the inlet flow channel 211, and the first sub-flow channel 212 corresponding to the final flow section 2113 forms a third preset angle with the inlet flow channel 211;

[0082] The first preset angle, the second preset angle and the third preset angle satisfy the following relationship:

[0083] θ1=θ3+10°

[0084] θ2=θ3+5°

[0085] Wherein, θ1 is the first preset angle, θ2 is the second preset angle, and θ3 is the third preset angle.

[0086] It should be noted that in some embodiments of the present application, the angle between the first sub-flow channel 212 and the inlet flow channel 211 (the first preset angle, the second preset angle and the third preset angle) can refer to the angle formed by the extension direction of the first sub-flow channel 212 and the extension direction of the inlet flow channel 211. In some other embodiments of the present application, for example, for the embodiment in which the inlet flow channel 211, the first sub-flow channel 212, the second sub-flow channel 213, the first outlet flow channel 214 and the second outlet flow channel 215 are all linear flow channel structures, the angle between the first sub-flow channel 212 and the inlet flow channel 211 can also refer to the angle formed by the side wall surface of the first sub-flow channel 212 and the side wall surface of the inlet flow channel 211.

[0087] Since the temperature of the cooling liquid in the heat dissipation flow channel 21 slowly rises with its flow, the temperature of the cooling liquid in the heat dissipation flow channel 21 is generally not uniform, and in the above embodiment, the first branch flow channels 212 of different flow sections of the inlet flow channel 211 are arranged at different preset angles with the inlet flow channel 211 respectively, and the first preset angle is greater than the second preset angle, and the second preset angle is greater than the third preset angle, the smaller the preset angle, the more convenient for the cooling liquid in the inlet flow channel 211 to flow into the first branch flow channel 212, so that the flow of the first branch flow channel 212 corresponding to the last section 2113 of the flow is the largest, the flow of the first branch flow channel 212 corresponding to the middle section 2112 of the flow is in the middle, and the flow of the first branch flow channel 212 corresponding to the first section 2111 of the flow is the smallest, thereby the flow distribution of the plurality of first branch flow channels 212 is adapted to the temperature of the cooling liquid in the heat dissipation flow channel 21, and finally it is beneficial to improve the heat dissipation uniformity of the liquid cooling plate 20.

[0088] Further, in some embodiments of the present application, the third preset angle is greater than or equal to 60° and less than or equal to 70°. Preferably, the third preset angle is 65°.

[0089] Further, in some embodiments of the present application, for example, for the embodiment in which the first section 2111, the middle section 2112 and the last section 2113 of the flow divide the inlet flow channel 211, continuing to refer to Figure 4 wherein the first branch flow channel 212 corresponding to the first section 2111 of the flow has a first preset width, the first branch flow channel 212 corresponding to the middle section 2112 of the flow has a second preset width, and the first branch flow channel 212 corresponding to the last section 2113 of the flow has a third preset width;

[0090] The first preset width, the second preset width and the third preset width satisfy the following relationship:

[0091] D2=D1+1mm

[0092] D3=D1+3mm

[0093] wherein D1 is the first preset width, D2 is the second preset width, and D3 is the third preset width.

[0094] Similarly, since the temperature of the cooling liquid in the heat dissipation flow channel 21 gradually increases as it flows, the cooling liquid in the heat dissipation flow channel 21 is generally not uniform. In the above embodiment, the widths of the first sub-flow channels 212 corresponding to different flow sections of the inlet flow channel 211 are set to different parameters, and the third preset width is greater than the second preset width, and the second preset width is greater than the first preset width. The smaller the preset angle, the more conducive to the flow of the cooling liquid in the inlet flow channel 211 into the first sub-flow channel 212, so that the flow of the first sub-flow channel 212 corresponding to the last section 2113 of the flow is the largest, the flow of the first sub-flow channel 212 corresponding to the middle section 2112 of the flow is in the middle, and the flow of the first sub-flow channel 212 corresponding to the first section 2111 of the flow is the smallest. The flow distribution of the plurality of first sub-flow channels 212 is adapted to the temperature of the cooling liquid in the heat dissipation flow channel 21, thereby facilitating to ensure the uniformity of heat dissipation of the liquid cooling plate 20.

[0095] In some embodiments of the present application, the first preset width is greater than or equal to 4 mm and less than or equal to 7 mm.

[0096] It can be understood that in the above embodiment, the angles (the first preset angle, the second preset angle, and the third preset angle) between the first sub-flow channel 212 and the inlet flow channel 211 are mainly determined, and the widths (the first preset width, the second preset width, and the third preset width) of the first sub-flow channel 212 are designed. The second sub-flow channel 213 can also be set in this way, which will not be described here.

[0097] In some embodiments of the present application, the widths of the first sub-flow channel 212 and the second sub-flow channel 213 gradually increase along the flow direction of the fluid in the inlet flow channel 211; and / or, the inclination angles of the first sub-flow channel 212 and the second sub-flow channel 213 relative to the inlet flow channel 211 gradually decrease along the flow direction of the fluid in the inlet flow channel 211. For example, the number of the plurality of first sub-flow channels 212 and the plurality of second sub-flow channels 213 is 10, the width of the first sub-flow channel 212 gradually and uniformly increases from 4 mm to 7 mm, and the inclination angle of the first sub-flow channel 212 and the second sub-flow channel 213 relative to the inlet flow channel 211 gradually and uniformly decreases from 70° to 60°. Since the widths of the first sub-flow channel 212 and the second sub-flow channel 213 gradually increase along the flow direction of the fluid in the inlet flow channel 211, and the inclination angles of the first sub-flow channel 212 and the second sub-flow channel 213 relative to the inlet flow channel 211 gradually decrease along the flow direction of the fluid in the inlet flow channel 211, the flow distribution of the plurality of first sub-flow channels 212 and the plurality of second sub-flow channels 213 can be adapted to the temperature of the cooling liquid in the heat dissipation flow channel 21, thereby facilitating to ensure the uniformity of heat dissipation of the liquid cooling plate 20.

[0098] It is worth noting that the above description of the battery assembly is intended to clearly illustrate the implementation of the present application, and those skilled in the art can make equivalent modifications and designs under the guidance of the present application, for example, two fishbone-shaped heat dissipation channels 21 are arranged in the liquid cooling plate 20, one of which is used for heat dissipation of the single battery 10 on one side, and the other is used for heat dissipation of the single battery 10 on the other side; for example, a plurality of single batteries 10 are arranged in a matrix, and the liquid cooling plate 20 is arranged between two adjacent rows of single batteries 10, and the liquid cooling plate 20 and / or the heat-conducting silica gel sheet 30 is arranged between adjacent single batteries 10 in a row of single batteries 10; for example, the inlet flow channel 211 is evenly divided into a plurality of flow sections, and the width and inclination angle of the first flow channel 212 corresponding to different flow sections are gradually changed.

[0099] Further, in order to better implement the battery assembly in the embodiments of the present application, on the basis of the battery assembly, the present application further provides a lithium ion battery comprising the battery assembly manufactured according to the above embodiments. Since the lithium ion battery in the embodiments of the present application comprises the battery assembly manufactured according to the above embodiments, it has all the beneficial effects of the battery assembly in the above embodiments, which will not be repeated here.

[0100] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be repeated here.

[0101] The above has described the basic concept, and it is obvious that the above detailed disclosure is only used as an example and does not constitute a limitation on the present application for those skilled in the art. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0102] At the same time, specific words are used in the present application to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0103] For simplicity of the descriptions of the present disclosure and to aid in the understanding of one or more inventive embodiments, the foregoing description of embodiments of the application may sometimes refer to a plurality of features in connection with an individual embodiment, figure, or description of an embodiment. However, this description does not imply that the application requires more features than those explicitly mentioned in the claims. In fact, the features of an embodiment may be fewer than the features of the single embodiment described above.

[0104] Some embodiments use numerals to describe components, quantities of attributes. It should be understood that such numerals used in the description of embodiments are, in some examples, modified by the adjectives "about", "approximately", or "substantially". Unless otherwise stated, "about", "approximately", or "substantially" indicates that the described numeral can vary by ±20%. Accordingly, numerical parameters in the description and claims are approximations, and may vary depending upon the requirements of a particular embodiment. In some embodiments, numerical parameters are determined by the use of common rounding techniques. Although the numerical ranges and parameters setting forth the broad scope of the application in some embodiments are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. The numerical values set forth in the specific examples are provided to be as precise as reasonably possible. However, some variations may occur depending on the choice of the device used in the experiments.

[0105] Each patent, patent application, publication, document, article, book, specification, and other material cited in this application is hereby incorporated by reference in its entirety, except to the extent that the incorporation of a document or other material would be inconsistent with the express teachings of this application. To the extent that any meaning or definition of a term in this application conflicts with the meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this application shall govern.

[0106] The above describes in detail the battery assembly and the lithium ion battery provided by the embodiments of the application. The principles and implementation manners of the application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. A battery assembly, characterized in that, include: Multiple individual battery cells, which are arranged side by side; A liquid cooling plate is located between adjacent individual cells, and the liquid cooling plate has heat dissipation channels inside. The heat dissipation channel includes an inlet channel, a plurality of first branch channels, a plurality of second branch channels, a first outlet channel, and a second outlet channel, wherein the first outlet channel and the second outlet channel are located on both sides of the inlet channel. The inlet channel is arranged along the centerline of the liquid cooling plate, and the first outlet channel and the second outlet channel are respectively arranged adjacent to the length edges of both sides of the liquid cooling plate; The plurality of first branch channels are arranged sequentially between the inlet channel and the first outlet channel, and the first branch channels connect the inlet channel and the first outlet channel; the plurality of second branch channels are arranged sequentially between the inlet channel and the second outlet channel, and the second branch channels connect the inlet channel and the second outlet channel. A thermally conductive silicone sheet is provided between the liquid cooling plate and the individual battery cell; One side of the thermally conductive silicone sheet is attached to the liquid cooling plate, and the other side is attached to the individual battery cell; The thickness of the thermally conductive silicone sheet gradually increases along the flow direction of the fluid in the inlet channel; The inlet flow channel includes an initial flow section, a middle flow section, and a final flow section, and the initial flow section, the middle flow section, and the final flow section each share the inlet flow channel; The first branch channel corresponding to the initial stage of the process forms a first preset angle with the inlet channel; the first branch channel corresponding to the middle stage of the process forms a second preset angle with the inlet channel; and the first branch channel corresponding to the final stage of the process forms a third preset angle with the inlet channel. The first preset angle, the second preset angle, and the third preset angle satisfy the following relationship: θ1 = θ3 + 10° θ2 = θ3 + 5° Wherein, θ1 is the first preset included angle, θ2 is the second preset included angle, and θ3 is the third preset included angle.

2. The battery assembly as claimed in claim 1, characterized in that, The liquid cooling plate includes a mother plate and a cover plate. The cover plate is attached to the mother plate. The side of the mother plate facing the cover plate has a groove. The groove is provided with a plurality of first fishbone protrusions and a plurality of second fishbone protrusions. The plurality of first fishbone protrusions and the plurality of second fishbone protrusions are arranged symmetrically with respect to the center line of the mother plate, and the plurality of first fishbone protrusions and the plurality of second fishbone protrusions define the inlet flow channel. The plurality of first fishbone protrusions are arranged sequentially along the length of the mother plate, and the first diversion channel is defined between adjacent first fishbone protrusions. The first outlet channel is defined by the plurality of first fishbone protrusions and the side wall adjacent to the settling tank. The plurality of second fishbone protrusions are arranged sequentially along the length of the mother plate, and the second diversion channel is defined between adjacent second fishbone protrusions. The second outlet channel is defined by the plurality of second fishbone protrusions and the side wall adjacent to the settling tank.

3. The battery assembly as described in claim 2, characterized in that, The mother plate has an inflow notch on one side edge and a first outflow notch and a second outflow notch on the other side edge. The inflow gap is connected to the inlet channel, the first outflow gap is connected to the first outlet channel, and the second outflow gap is connected to the second outlet channel.

4. The battery assembly as claimed in claim 1, characterized in that, The third preset included angle is greater than or equal to 60° and less than or equal to 70°.

5. The battery assembly as claimed in claim 1, characterized in that, The first branch channel corresponding to the initial stage of the process has a first preset width, the first branch channel corresponding to the middle stage of the process has a second preset width, and the first branch channel corresponding to the final stage of the process has a third preset width. The first preset width, the second preset width, and the third preset width satisfy the following relationship: D2 = D1 + 1 mm D3 = D1 + 3 mm Wherein, D1 is the first preset width, D2 is the second preset width, and D3 is the third preset width.

6. The battery assembly as claimed in claim 5, characterized in that, The first preset width is greater than or equal to 4 mm and less than or equal to 7 mm.

7. The battery assembly as claimed in claim 1, characterized in that, Along the flow direction of the fluid within the inlet channel, the widths of the first and second branch channels gradually increase; and / or Along the flow direction of the fluid in the inlet channel, the inclination angles of the first branch channel and the second branch channel relative to the inlet channel gradually decrease.

8. The battery assembly as claimed in claim 1, characterized in that, The width of the first outlet channel is equal to the width of the second outlet channel, and the ratio of the width of the first outlet channel or the second outlet channel to the width of the inlet channel is between 1:1 and 2:

1.

9. The battery assembly as claimed in claim 8, characterized in that, The width of the inlet channel is 6-12 mm, and the width of the first outlet channel or the second outlet channel is 6-12 mm.

10. The battery assembly as claimed in claim 1, characterized in that, The width of the first branch channel and the width of the second branch channel are both 4~10 mm.

11. The battery assembly according to any one of claims 1 to 10, characterized in that, The depth of the heat dissipation channel is 1~4mm.

12. A lithium-ion battery, characterized in that, Includes the battery assembly as described in any one of claims 1 to 11.

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