Battery system heat dissipation assembly and battery system

Abstract

The invention discloses a battery system heat dissipation assembly and a battery system. The battery system heat dissipation assembly comprises a liquid cooling plate for dissipating heat and cooling the bottom of a battery cell of a battery system, and a heat pipe assembly which is vertically mounted in a groove in the surface of one side of the liquid cooling plate in an embedded manner and is used for dissipating heat and cooling the large surface of the battery cell; the heat pipe assembly comprises a plurality of heat pipe units, a plurality of independent pipe cavities are formed in the heat pipe units, the heat pipe units have preset deformation, the pipe cavities are linearly arranged and connected to form a sheet structure, each pipe cavity is filled with a liquid-vapor phase change material, and the adjacent heat pipe units are spaced to form a battery cell space. According to the invention, the combination of the liquid cooling plate and the heat pipe units is adopted, and the adjacent heat pipe units are separated to form the battery cell space, so that heat dissipation and cooling of the two large surfaces and the bottom surface of the battery system can be realized, and good cooling and temperature equalizing effects on the battery cells of the battery system are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery system heat dissipation component and a battery system. Background Art

[0002] At present, the new energy industry is booming, and the application scope of various new technologies is becoming more and more extensive. Not only has it developed by leaps and bounds in the automotive field, electric ship field and energy storage field, but it is also used in the low-altitude field and other electricity-related fields. As the most important source of power, the demand for batteries is also constantly expanding. During the use of the battery, due to the electrochemical characteristics of the battery cell itself, it will inevitably generate heat, causing the battery temperature to rise. If the battery heat is not dissipated in time and the battery temperature is not reduced to a certain range, it will have a great adverse effect on the performance, life and safety of the battery. Therefore, a very important research direction in this field is to effectively release the heat of the battery system.

[0003] At present, the heat dissipation of battery systems usually adopts cold plate heat exchange, usually by setting a liquid cooling plate at the bottom of the battery pack for heat dissipation. However, there are problems such as small heat exchange contact area and large temperature difference between the top and bottom of the battery, which affects the maximum efficiency of the battery cell. Therefore, in order to increase the contact area, some designs will also arrange liquid cooling plates on the sides or large surfaces of the battery cells. However, the liquid flow channel is difficult to arrange, the flow resistance is large, the flow uniformity is poor, and the installation process is complicated, which limits its use. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and defects of the prior art and to provide a battery system heat dissipation component capable of dissipating heat and cooling three sides of a battery cell of the battery system and a battery system using the battery system heat dissipation component.

[0005] One object of the present invention is to provide a battery system heat dissipation assembly, comprising a liquid cooling plate for dissipating heat and cooling the bottom of a battery cell of the battery system, and a heat pipe assembly embedded and vertically installed in a groove on one side surface of the liquid cooling plate for dissipating heat and cooling the large surface of the battery cell; the heat pipe assembly comprises a plurality of heat pipe units with a predetermined amount of deformation and a plurality of independent cavities formed therein, the cavities being arranged in a straight line and connected to form a sheet structure, each of the cavities being filled with a liquid-gas phase change material, and adjacent heat pipe units being spaced apart to form a battery cell space.

[0006] Wherein, the cross section of the lumen is rectangular.

[0007] Wherein, two adjacent tube cavities are connected via a partition, the thickness of the partition is smaller than the thickness of the tube cavities, and a groove structure is formed on at least one side between the two adjacent tube cavities.

[0008] Wherein, adhesive is filled between the embedded end of the heat pipe unit and the groove, and adhesive bonding is adopted.

[0009] Wherein, the embedded end of the heat pipe unit is connected to the groove by a retaining spring, and glue is filled between the groove and the embedded end of the heat pipe unit to bond and fix them.

[0010] Wherein, the retaining spring is arranged between the outer side surface of the embedding end of the heat pipe unit and the side wall of the groove.

[0011] Wherein, the heat pipe unit is formed by pressing metal material.

[0012] Wherein, the liquid-vapor phase change material adopts insulating liquid-vapor phase change material.

[0013] The tube cavity is in contact with the large surface of the battery core through an insulating film and / or a thermally conductive adhesive to dissipate heat and cool the battery.

[0014] Another object of the present invention is to provide a battery system, comprising the battery system heat dissipation assembly.

[0015] The battery system heat dissipation component of the present invention adopts a combination of a liquid cooling plate and a heat pipe unit, and forms a battery cell space by spacing adjacent heat pipe units, so as to achieve heat dissipation and cooling of three surfaces of the battery system, namely, two large surfaces and a bottom surface, and has a good cooling and temperature equalization effect on the battery cells of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a single cell of a battery system according to an embodiment of the present invention.

[0017] Figure 2 A schematic diagram of a new energy vehicle with a battery system according to an implementation example of the present invention.

[0018] Figure 3 A schematic diagram of an energy storage battery system according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the battery pack structure of an implementation example of the present invention.

[0020] Figure 5 It is a structural schematic diagram of a battery system including a heat pipe unit and a liquid cooling plate according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of a heat dissipation assembly formed by connecting a heat pipe unit and a liquid cooling plate according to an embodiment of the present invention.

[0022] Figure 7 Schematic diagram of the embedding and spring connection of the heat pipe unit and the liquid cooling plate according to an embodiment of the present invention.

[0023] Figure 8 A comparison diagram of different connection methods between the heat pipe unit and the liquid cooling plate according to an embodiment of the present invention.

[0024] Fig. 9 Schematic top view of a liquid cooling plate of a heat dissipation assembly according to an embodiment of the present invention.

[0025] Fig.10 It is a cross-sectional schematic diagram of a heat pipe unit of a heat dissipation assembly according to an embodiment of the present invention.

[0026] Fig.11 FIG. 4 is a schematic diagram of heat dissipation of a heat dissipation component according to an embodiment of the present invention.

[0027] Fig.12 Schematic diagram of thermal simulation analysis comparison between the embodiment of the present invention and a traditional heat dissipation system.

[0028] Description of reference numerals:

[0029] Single battery 01, upper box 02, lower box 03, liquid cooling plate 04, heat pipe unit 05, battery pack 06, thermal conductive structural adhesive 07, battery cell space 08, retaining spring 09, water inlet 043, water outlet 044;

[0030] Large surface 011, bottom surface 012, side surface 01, positive pole 014, negative pole 015;

[0031] Groove 041, circulation channel 042, water inlet 043, water outlet 044;

[0032] Lumen 051, partition 052;

[0033] Battery module 101, new energy vehicle 100;

[0034] Battery cluster 210 and energy storage battery system 200 . DETAILED DESCRIPTION

[0035] The following is a detailed description of the implementation examples of the technical solution of the present application in conjunction with the accompanying drawings. The following implementation examples are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as illustrations, rather than to limit the scope of protection of the present application.

[0036] Unless otherwise specified and defined, all the techniques and terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs. The terms used in this patent are only for describing specific implementation cases and are not intended to limit this application. Therefore, the terms "including" and "having" and any extensions thereof in the specification and claims of this application and the description of the drawings in the text are intended to cover non-exclusive inclusions.

[0037] In the description of the implementation cases of this application, technical terms such as "improve", "better than", "improvement", etc. are only used to distinguish different objects, rather than to indicate or imply relative importance or to implicitly explain the number, specific order and primary and secondary relationships of technical features.

[0038] Reference to "implementation" herein means that the specific features, structures, or characteristics described in conjunction with the implementation may be included in at least one implementation of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same implementation, nor is it an independent or alternative implementation that is mutually exclusive with other implementations. The implementation described herein may be combined with other implementations.

[0039] In the description of the implementation cases of this application, the terms "multiple" and "etc." refer to more than two (including two). Similarly, "multiple groups" refer to more than two groups (including two groups), and "multiple pieces" refer to more than two pieces (including two pieces).

[0040] In the description of the implementation cases of the present application, the orientations or positional relationships indicated by technical terms such as "above", "below", "upper part", "lower part", "bottom surface", "up", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", and "radial" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the implementation cases of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the implementation cases of the present application.

[0041] In the description of the implementation cases of this application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the implementation cases of this application can be understood according to the specific circumstances.

[0042] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric transportation fields such as electric bicycles, electric motorcycles, electric vehicles, electric ships, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0043] The applicant has noticed that during the use of the battery, the battery cells or single cells will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery. In the related art, a cooling system can be set to cool the battery cells in the battery. The above-mentioned cooling system may include a plurality of water-cooling plates laid on the bottom of the battery case, and the surfaces of the plurality of water-cooling plates are in contact with the surfaces of the heat pipes between the battery cells in the battery. During use, a coolant such as water flows through the above-mentioned water-cooling plates, thereby taking away the heat on the bottom surface of the battery cells; at the same time, the heat of the heat pipes sandwiched between the battery cells is taken away to cool the battery cells.

[0044] The battery cell or single cell disclosed in the implementation case of this application is a rectangular cell or a square cell, including but not limited to being used in electrical devices such as vehicles, ships or aircraft. A power supply system of the electrical device can be composed of a water-cooled plate assembly, a water-cooling system, a heat pipe unit, a battery, etc. disclosed in this application, which is conducive to alleviating the expansion of the battery cell and improving the stability of battery performance and battery life.

[0045] The implementation case of the present application provides an electrical device that uses a battery as a power source. The electrical device can be but is not limited to an electric vehicle, an electric vehicle, a ship, a spacecraft, an energy storage system, etc.

[0046] For the convenience of explanation, the following implementation case takes an electrical device in the implementation case of the present application as an energy storage battery pack as an example.

[0047] Please refer to Figure 1 , Figure 1 Schematic diagram of a square aluminum shell single cell provided in some embodiments of the present application. The large surface, bottom surface, poles, etc. are defined. A single cell 01 has two large surfaces 011, a bottom surface 012, two side surfaces 013, and the surface opposite to the bottom surface has a positive pole 014 and a negative pole 015.

[0048] Please refer to Figure 2 , Figure 2 A schematic diagram of a new energy vehicle 100 including a battery module 101 provided in some embodiments of the present application. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle.

[0049] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of an energy storage battery system 200 formed by a battery module composed of a battery cluster 210 in an energy storage container provided in some embodiments of the present application.

[0050] Among them, some embodiments of the present application provide a battery system for new energy vehicles and energy storage battery systems, that is, a battery pack structure such as Figure 4The battery system can be, but is not limited to, battery vehicles, electric vehicles, ships, spacecraft, energy storage systems, industrial and commercial energy storage systems, household energy storage systems, and the like.

[0051] For the convenience of description, the following embodiments are described by taking a battery pack system in which an electrical device of an embodiment of the present application is an energy storage module as an example.

[0052] Please refer to Figure 4 , Figure 4 An exploded diagram of a battery pack system provided in some embodiments of the present application. The battery pack system includes a single battery 01, an upper box 02, a lower box 03, a liquid cooling plate 04, a heat pipe unit 05, and a battery pack 06. The upper box 02 and the lower box 03 form a closed space, which protects the battery and other components, and is connected to the energy storage battery cluster or the vehicle to provide energy.

[0053] Among them, the single battery 01 can be in various shapes, such as a cylinder, a cuboid, etc. There can be multiple battery cells, and the multiple battery cells can be connected in series, in parallel, or in a mixed connection. Mixed connection means that multiple battery cells are both connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells is accommodated in a box. The battery can also be a battery module in which multiple battery cells are first connected in series, in parallel, or in a mixed connection, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in a box. The battery system may also include other structures. For example, the battery may also include a confluence component for realizing electrical connection between multiple battery cells. Among them, each single battery 01 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell may be cylindrical, flat, cuboid, or in other shapes.

[0054] The battery system heat dissipation component provided in this application is Figure 5 , Figure 6 as well as Fig.10 As shown, it includes a liquid cooling plate 04 and a heat pipe unit 05. There are multiple heat pipe units 05, which are sheet-like structures, and multiple independent tube cavities 051 are formed inside. The tube cavities are arranged in a straight line and connected to form a sheet-like structure. Each tube cavity 051 is filled with liquid-gas phase change material. Adjacent heat pipe units are spaced apart to form a battery cell space 08, wherein the heat pipe assembly composed of the heat pipe units is embedded and vertically installed in a groove 041 on one side surface of the liquid cooling plate 04.

[0055] In some embodiments of the present application, the cross section of the tube cavity is rectangular. Two adjacent tube cavities are connected by a partition 052, the thickness of the partition is smaller than the thickness of the tube cavity, and a groove structure is formed on at least one side between the two adjacent tube cavities. Fig.10 Shown

[0056] In some embodiments of the present application, the phase change material in the tube cavity is itself insulated, and even if it leaks accidentally, it will not cause insulation failure of the battery system and short circuit of related electrical devices; and the phase change material will also quickly vaporize and evaporate at room temperature. At present, due to the heat dissipation properties and principles of heat pipes, they need to be placed vertically, and the upper part of the heat pipe takes away the heat of the heat pipe through a heat dissipation device, so that the phase change material that is heated and evaporated, due to the lower temperature of the upper part, the vaporized material on the top condenses and becomes liquid; and the liquid sinks to the lower part due to gravity, and the lower part is heated and vaporized again, taking away the heat from the contact surface of the heat pipe, and so on and so forth, so as to timely take away the heat from the contact surface of the heat source, and play a heat dissipation role for the battery.

[0057] In the technical solution of the implementation case of this application, the interior of the heat pipe assembly is hollow, and is composed of a number of small tube cavities arranged side by side to form an overall large heat pipe sheet, in which a certain amount of phase change material is sealed. Therefore, the phase change material can quickly pass through the small pipeline and circulate up and down along the pipeline, and the metal material of the heat pipe (such as aluminum or copper) also has a good heat dissipation effect, and is quickly conducted out through the metal surface. Among them, since there is a PET insulating film and a thermally conductive structural adhesive between the outer surface of the tube cavity of the heat pipe unit and the large surface of the battery core, no short circuit will be formed, and it can be used safely. Of course, there is also a thermally conductive structural adhesive between the top of the embedded end of the heat pipe unit and the groove.

[0058] In the technical solution of the embodiment of the present application, Figure 4 , 5 , 6 and Fig. 9 , Fig.10 As shown, the liquid cooling plate 04 has a water inlet 043 and a water outlet 044, and has a channel inside for liquid cooling medium to flow. Liquid cooling medium enters from the water inlet 043 and flows out from the water outlet 044, realizing circulation, taking away the heat from the bottom surface of the battery, and realizing heat dissipation from the bottom surface of the battery.

[0059] In the technical solution of the embodiment of the present application, a combined use technology of heat pipes and liquid cooling plates is adopted to make the heat dissipation of the battery cells faster and more uniform. In lithium battery systems, liquid cooling plates are relatively mature, but heat pipe technology is less used due to the limitations of its heat dissipation principle, and there are even fewer studies on integrating the two. In the actual application of heat pipes, the key is how to take away the heat in the enclosed space of the battery box, which is difficult to achieve. This invention effectively solves this difficulty by inverting the battery cell and placing the liquid cooling plate on the top of the box. The liquid cooling plate dissipates heat to the bottom of the battery cell while taking away the heat from the heat pipe.

[0060] In the technical solution of the implementation case of the present application, the heat pipe is tightly attached to the large surface of the battery cell, so as to achieve heat dissipation of the large surface of the battery cell, and at the same time can prevent or delay the problem of heat spread between the battery cells; the upper part of the heat pipe is embedded in the liquid cooling plate on the top of the box body through the thermal conductive structural adhesive, which is firm and reliable, and the heat from the top of the heat pipe is taken away by the liquid cooling plate; the liquid cooling plate is based on the different thicknesses of the battery cell, through extrusion of aluminum profiles or brazing process, on the one hand, the surface of the liquid cooling plate contacts with the bottom surface of the battery cell to directly dissipate the heat of the battery cell; on the other hand, a groove of a certain depth is extruded or stamped, and the heat pipe sheet is bonded in the groove, and the heat of the heat pipe is taken away by the liquid cooling plate, so as to achieve cooling of the three large surfaces of the battery cell.

[0061] The present invention integrates two liquid cooling methods, making it possible to apply this technology in lithium battery systems, achieving uniform heat dissipation with the maximum contact area for the two large surfaces and one bottom surface of the battery cell, and truly realizing direct heat dissipation of the three largest surfaces of the square battery cell. Traditional heat dissipation technology is basically cooling one side (bottom surface) or two sides (two large surfaces), so the heat dissipation effect of this application is better. Through the analysis and comparison of data from thermal simulation, ideal results have been achieved in terms of temperature rise, temperature uniformity, and heat dissipation rate of the battery cell. The service life and charge and discharge rate of the battery cell are also further improved, meeting the higher expectations of customers.

[0062] The technical solution of the implementation case of this application is three-sided cooling, and three large surfaces. According to the heat dissipation formula, the larger the surface area, the higher the heat dissipation efficiency. At the same time, the surface temperature of the battery cell is more uniform, reducing the temperature difference between the top and bottom of the battery cell itself. Among them, liquid cooling plate cooling and heat pipe cooling are manifested as heat conduction between the battery and follow Fourier's heat conduction law. The heat conduction transfer model can be expressed by the following formula:

[0063]

[0064] Among them, Φ is the amount of heat (heat flow) passing through a given area per unit time, in W; λ is the proportionality coefficient, also known as thermal conductivity, in W / (m·K); A is the area, in m 2 ; is the temperature gradient.

[0065] In some implementation cases, cooling by two large surfaces can also prove to be more effective than cooling by one large surface; and three-sided cooling is better than two-sided cooling.

[0066] The technology of the embodiments of the present application can effectively block the thermal diffusion of the battery. After a single battery cell thermally runs away, the heat pipe is used to isolate the adjacent battery cells, which can effectively reduce heat conduction and prevent thermal runaway and spread. In the technical solution of the implementation case of the present application, since the battery cells are sandwiched by metal sheets with phase change materials in the middle, the chain reaction of heat spread caused by the failure of a battery cell can be effectively blocked. Even if the phase change material leaks, it will not cause a short circuit in the battery system because it is insulated and will vaporize quickly.

[0067] In addition, since the heat pipe can be made very thin and the aerogel, PC sheet, double-sided tape and other materials between the battery cells are eliminated, it is also helpful to reduce the size and weight of the battery system. At the same time, since the heat pipe is hollow inside, the phase change material does not fill its space 100%, so it also plays a certain buffering and pressure-bearing role as the battery cell expands and contracts, effectively ensuring that the battery cell is used under a certain pressure, further improving the cycle life of the battery cell, and reducing the risk of lithium plating and internal short circuit.

[0068] like Figure 7 As shown, Figure 7 This is a schematic diagram of the connection between the heat pipe unit and the liquid cooling plate of the heat dissipation assembly of the battery system in some embodiments of the present application, which shows the connection method between the liquid cooling plate and the heat pipe in the heat dissipation assembly of the battery system. Figure 7 As shown, the embedded end of the heat pipe unit 05 is connected to the groove 041 by a retaining spring 09, and a thermal conductive structural adhesive 07 is used to fill the gap between the embedded end of the heat pipe unit and the groove to form a seal.

[0069] In the embodiment of the present application, the groove 041 is arranged on the surface of the position between the flow channels 042 of the liquid cooling medium of the liquid cooling plate, such as Figure 7 shown.

[0070] According to some embodiments of the present application, Figure 4 As shown, a plurality of single battery cells 01 are combined into a plurality of series-parallel battery systems as required, and they are connected through structures such as a bus, an LMU, a wiring harness, temperature acquisition, and voltage acquisition, and the battery cells 01 are separated by a plurality of sheet-type heat pipe units 05.

[0071] In the present application, the heat pipe unit and the liquid cooling plate are preferably connected by embedding, and can be fixed by gluing, or by a connection method in which a spring and an embedded part are connected, which further enhances the reliability of the connection between the two, and has a better effect than relying solely on gluing. Figure 8Schematic diagrams and calculation results of the connection methods between the heat pipe unit and the liquid cooling plate of some embodiments of the present application are shown. The connection method on the left is direct bonding, the middle scheme adopts groove and bonding, and the right scheme adopts retaining spring and groove embedding and bonding. The test surface can withstand tensile forces of 3600N, 4700N and 6000N respectively, indicating that the connection method combining retaining spring 09 and embedded is more secure, thereby avoiding the risk of poor heat conduction caused by the detachment of the two and the inability to release the heat of the battery cell.

[0072] As we all know, during the use of batteries, they store and release energy through charging and discharging to meet the needs of terminal products. The higher the charging and discharging power used, the higher the heat generated; the more cells used and the closer they are, the higher the overall temperature of the battery pack. If the heat is not transferred out in time, it will seriously affect the service life and even safety of the battery. Usually, the acceptable charge and discharge rate and maximum temperature of the battery are obtained based on the relevant data of the single cell and the simulation of the battery system, and the peak control is performed through the BMS. This will greatly reduce the conversion efficiency and service life of the single cell to the battery system.

[0073] The heat dissipation assembly of the battery system of the present invention cools three sides of the battery cell due to the phase change material cooling of the two large surfaces of the battery cell and the cooling of the liquid cooling plate at the bottom of the battery cell, thereby improving the overall cooling effect.

[0074] According to some cases of the present application, during the heat generation process of a single cell, the temperature of its outer shell will rise, and its large surface can transfer heat to the surface of the heat pipe because it is in close contact with the heat pipe; after the heat pipe surface absorbs the heat from the large surface of the battery, the phase change material inside it will quickly change from liquid to vapor due to heat absorption, and take away the heat from the large surface of the battery cell, thereby reducing the temperature of the battery cell; at the same time, according to the different installation positions of each battery cell, the amount of phase change material in the heat pipe is adjusted to optimize the temperature difference of the large surface of each single cell as much as possible; and the vaporized phase change material will rise to the top of the heat pipe, and the top of the heat pipe is in contact with the liquid cooling plate, and the temperature is low, so the phase change material is quickly liquefied when it is cold, and the heat is taken away by the liquid cooling plate through the coolant flowing inside. The liquid phase change material at the top will sink to the bottom of the heat pipe due to its increased weight and density. The bottom will be heated and vaporized again, becoming lighter and rising to the top of the heat pipe. This process will be repeated to take away the heat from the large surface of the battery cell and reduce the temperature. During the heat dissipation and cooling process, the flow path of the phase change material is as follows: Fig.11 As shown by the arrow in the figure, the heat is dissipated in the direction shown by the arrow on the top of the liquid cooling plate.

[0075] According to some cases of the present application, the liquid cooling plate on the top of the battery pack of the battery system of the present invention is in contact with the bottom of the battery, and the liquid cooling plate can take away the heat from the bottom of the inverted single battery, thereby reducing the temperature of the bottom of the single battery; thus, the three large surfaces of the single battery cell of the battery system or battery pack are effectively cooled, which can be adjusted through the BMS strategy.

[0076] According to the principle of the heat dissipation assembly of the present invention, through simulation and different designs of liquid cooling plate flow channels, as well as the flow rates of water inlets and outlets, the heat dissipation requirements of the three sides of the battery cell can be effectively met, ensuring that the battery is in a very friendly operating temperature environment, thereby greatly improving the number of cycles and life of the single battery cell and even the entire battery system.

[0077] Fig.12 The simulation results are shown. Two cooling methods are used to simulate the 314Ah, 1P52S battery pack. Two cooling methods are used to simulate the 314Ah, 1P52S battery pack. The heat generation power of the 1CP battery cell is 45W, the initial temperature is 25℃, the wave cooling plate cools the liquid flow rate: 6.5L / min, the coolant temperature is 22℃, the maximum temperature on the upper surface of the battery cell is greater than 30℃, the bottom wave cooling is turned on, and the minimum temperature is less than 25℃, the liquid cooling is turned off;

[0078] Among them, Solution 1: Heat pipe cooling solution, after 1CP charging 36005, the maximum temperature on the upper surface of the battery cell is 38.69℃, the temperature difference is 4.62℃, and the temperature difference between the top and bottom of the battery cell is about 8℃; Solution 2: Bottom liquid cooling plate cooling solution, after 1CP charging 36005, the maximum temperature on the upper surface of the battery cell changes to 46.39℃, the temperature difference is 0.75℃, and the top temperature of the battery cell is about 18℃; The simulation results show that the heat pipe solution has a better cooling effect, can support 1CP charging and discharging, and greatly reduces the temperature difference between the top and bottom of the battery cell. Fig.12 It is not difficult to see from the simulation schematic diagram that the temperature drop of the entire battery cell and the temperature difference between the top and bottom are greatly improved compared with traditional heat dissipation methods.

[0079] According to some cases of the present application, the heat pipe unit of the present application is made of metal materials, such as aluminum or copper, or alloys thereof. Since the heat pipe unit itself is a hollow structure made of aluminum or copper and has a certain amount of deformation, it can also adapt well to the expansion and contraction deformation of the large surface of the battery, further improving the service life of the battery, and even the number of cycles and life of the entire battery system.

[0080] Another object of an embodiment of the present invention is to provide a battery system, including the battery system heat dissipation assembly of the embodiment of the present invention.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application.

[0082] In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery system heat dissipation component, characterized in that: It comprises a liquid cooling plate for cooling the bottom of a battery cell of a battery system, and a heat pipe assembly embedded and vertically installed in a groove on one side surface of the liquid cooling plate for cooling the large surface of the battery cell; the heat pipe assembly comprises a plurality of heat pipe units with a predetermined amount of deformation and a plurality of independent cavities formed therein, the cavities are arranged in a straight line and connected to form a sheet structure, each of the cavities is filled with a liquid-vapor phase change material, and adjacent heat pipe units are spaced apart to form a battery cell space.

2. The battery system heat dissipation assembly according to claim 1, characterized in that: The cross section of the lumen is rectangular.

3. The battery system heat dissipation assembly according to claim 1, characterized in that: Two adjacent lumens are connected via a partition, the thickness of the partition is smaller than the thickness of the lumens, and a groove structure is formed on at least one side between the two adjacent lumens.

4. The battery system heat dissipation assembly according to claim 1, characterized in that: Adhesive glue is filled between the embedded end of the heat pipe unit and the groove, and the heat pipe unit and the groove are bonded by glue.

5. The battery system heat dissipation assembly according to claim 1, characterized in that: The embedded end of the heat pipe unit is connected to the groove by a clamping spring, and glue is filled between the groove and the embedded end of the heat pipe unit to bond and fix them.

6. The battery system heat dissipation assembly according to claim 5, characterized in that: The clamping spring is arranged between the outer side surface of the embedding end of the heat pipe unit and the side wall of the groove.

7. The battery system heat dissipation assembly according to claim 1, characterized in that: The heat pipe unit is formed by pressing metal materials.

8. The battery system heat dissipation assembly according to claim 1, characterized in that: The liquid-vapor phase change material is an insulating liquid-vapor phase change material.

9. The battery system heat dissipation assembly according to claim 1, characterized in that: The tube cavity is in contact with the large surface of the battery core through an insulating film and / or a heat-conducting adhesive to dissipate heat and cool the battery.

10. A battery system, characterized in that Comprising the battery system heat dissipation component according to any one of claims 1-9.

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