Immersed liquid-cooled battery pack, battery pack temperature control method and medium

Abstract

The invention provides an immersed liquid-cooled battery pack, a battery pack temperature control method and a medium, the battery pack comprises a box body and a battery module, and the box body is provided with a circulating system; an upper flow plate and a lower flow plate are arranged in the box body, an upper liquid hole and a lower liquid hole are formed in the box body, and the upper liquid hole and the lower liquid hole are connected with the circulating system through connecting pipelines; a plurality of upper through holes are formed in the upper flow plate, and a plurality of lower through holes are formed in the lower flow plate; the method comprises the following steps: S1, acquiring data of a temperature sensor; s2, monitoring four pieces of temperature data and sorting the four pieces of temperature data in real time; and S3, according to a sorting result, adjusting the corresponding connection port to be a liquid injection port or a liquid discharge port. By arranging the circulating system, the upper flow plate and the lower flow plate on the box body and combining the design of the through holes and the arrangement of the upper liquid hole and the lower liquid hole, the cooling liquid can form an organized flowing path in the battery pack, the flowing uniformity and the updating rate of the cooling liquid in the battery pack are remarkably improved, and the thermal management capability of the system is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of immersion liquid cooling energy storage, in particular to an immersion liquid cooling battery pack, a battery pack temperature control method and a medium. BACKGROUND

[0002] With the rapid development of new energy vehicles, energy storage power stations and other fields, lithium batteries have become the mainstream choice due to their high energy density, long cycle life and other advantages. However, battery performance and life are highly dependent on temperature management, and ideal working temperature needs to be controlled between 25℃-45℃, and both too high and too low will cause capacity attenuation, thermal runaway and even explosion.

[0003] At present, the mainstream cooling method of energy storage battery pack in the market is mainly air cooling and cold plate liquid cooling. Although the air-cooled battery pack has the advantages of low cost and simple structure, its shortcomings in heat dissipation efficiency, temperature uniformity and influence of environmental temperature limit its application range; liquid cooling relies on indirect contact cooling plate, which has the problems of large thermal resistance and complex structure, and cold plate liquid cooling needs to pass through multiple structures (such as battery module, shell, cooling plate) to transfer heat, and the thermal resistance is superimposed, which reduces the efficiency, and cannot uniformly cover the surface of all battery cells; in addition, some cooling media (such as glycol solution) have the risk of electric conduction, and metal heat sinks increase the weight and cost, affecting the energy density of the battery pack. The above two cooling methods are difficult to achieve rapid temperature equalization in high temperature or overcharge scenarios, increasing the risk of fire accidents in energy storage power stations; to solve the above problems, the battery cooling technology field has appeared immersion liquid cooling technology, which immerses the battery in special insulating cooling liquid (such as fluorinated liquid, silicon oil), completely isolates from oxygen, directly absorbs heat through the cooling medium, reduces thermal resistance, and improves the heat dissipation efficiency of the system. Compared with traditional air-cooled and liquid-cooled plate heat dissipation technology, this method can make the temperature field in the battery pack more uniform, and has faster cooling speed and shorter cooling time, which can improve the safety performance of the energy storage power station, so it has higher efficiency and better performance in battery cooling.

[0004] However, the existing immersion liquid cooling battery pack usually places the cooling liquid in the battery pack or sets up a cooling liquid circulation system at a fixed position. Although the cooling liquid can take away the heat generated by the battery during operation to some extent, due to the limited flow path of the cooling liquid inside the battery pack, there is a phenomenon of slow flow or even stagnation in local areas, resulting in uneven liquid exchange, and the update speed of the cooling liquid between each battery cell or module is significantly different. This uneven liquid exchange condition will cause the temperature field to be unevenly distributed in space, and some areas may experience overheating or cooling lag, thereby limiting the overall cooling efficiency and response speed of the system, prolonging the cooling time, and affecting the safety and service life of the energy storage system, which is not conducive to the realization of efficient and stable energy management goals. SUMMARY

[0005] The present application aims at the problems in the prior art, and provides an immersed liquid-cooled battery pack, a battery pack temperature control method and a medium, which solve the problem of overheating or cooling lag in some areas caused by uneven replacement of cooling liquid in the immersed liquid-cooled battery pack.

[0006] The technical scheme adopted by the present application is as follows: In a first aspect, the present application provides an immersed liquid-cooled battery pack, comprising a box body and a battery module arranged in the box body, wherein the box body is provided with a circulation system; An upper flow plate is arranged above the battery module in the box body, and a lower flow plate is arranged below the battery module in the box body, and at least one upper liquid hole and at least one lower liquid hole are formed in the box body, the upper liquid hole is arranged above the upper flow plate, and the lower liquid hole is arranged below the lower flow plate; The upper liquid hole and the lower liquid hole are connected with the circulation system through a connecting pipeline; A plurality of upper through holes are arranged on the upper flow plate, and a plurality of lower through holes are arranged on the lower flow plate.

[0007] Preferably, the battery module comprises a plurality of battery cells arranged side by side, at least two adhesive strips are arranged between every two adjacent battery cells, the adhesive strips are arranged vertically between the adjacent two battery cells, and a fluid channel is formed between the two adhesive strips and the two side battery cells.

[0008] Preferably, the number of the upper through holes is the same as that of the lower through holes, and the upper through holes and the lower through holes are arranged one by one in the vertical direction.

[0009] Preferably, the number of the upper liquid holes and the number of the lower liquid holes are both two, the upper liquid holes are arranged on the upper end face of the box body, the two upper liquid holes are arranged oppositely on the box body, the two lower liquid holes are arranged on the side end face of the box body and correspondingly arranged on the box body, and the two upper liquid holes and the two lower liquid holes are arranged in the same plane.

[0010] Preferably, the circulation system is provided with four connecting ports, and the upper liquid hole, the lower liquid hole and the connecting port are connected one by one through the connecting pipeline.

[0011] Preferably, a valve is arranged on each connecting pipeline.

[0012] Preferably, at least two temperature sensors are arranged in the box body, and the temperature sensors are used for detecting the temperature of the cooling liquid.

[0013] Preferably, four temperature sensors are arranged in the box body, and the temperature sensors are arranged in the same plane with the upper liquid hole and the lower liquid hole.

[0014] In a second aspect, the present application provides a temperature control method for the immersed liquid-cooled battery pack as described in the first aspect, comprising the following steps: Step S1, presetting a high temperature threshold Tmax and a low temperature threshold Tmin; Step S2, real-time acquisition of temperature data Ti of four temperature sensors, i=1, 2, 3, 4, within a time window t, if Tmin<Ti<Tmax, jump to step S4; otherwise jump to step S3; Step S3, if the abnormal temperature data exceeds the high temperature threshold Tmax, the battery pack is powered off and an alarm is given, and if the abnormal temperature data is lower than the low temperature threshold Tmin, jump to step S4; Step S4, sorting the four temperature data, according to the sorting result, setting the connection ports corresponding to the upper liquid holes and / or lower liquid holes of the two temperature sensors close to the high temperature as liquid injection ports, and setting the connection ports corresponding to the other two upper liquid holes and / or lower liquid holes as liquid discharge ports, and jumping to step S2.

[0015] In a third aspect, the present application provides a computer readable storage medium, which stores computer instructions, when the computer reads the computer instructions in the storage medium, the computer executes the temperature control method according to the second aspect.

[0016] From the above technical solutions, the present application has the following advantages: 1. By setting a circulation system on the box body, and setting an upper flow plate and a lower flow plate above and below the battery module respectively, combining the through hole design and the arrangement of the upper and lower liquid holes, the cooling liquid can form an organized flow path in the battery pack, solving the problem of "limited flow path and liquid retention" in the existing immersion liquid cooling method, significantly improving the flow uniformity and update rate of the cooling liquid in the battery pack, thereby improving the overall cooling efficiency and response speed, and enhancing the system thermal management capability.

[0017] 2. By setting vertical adhesive strips between adjacent battery cells and forming channels, an effective flow path of the cooling liquid between the battery cells is constructed, so that the cooling liquid can penetrate all the gaps between the battery cells, avoiding the accumulation of heat in a local area, effectively alleviating the defect that the traditional liquid cooling cannot uniformly cover the surface of the battery cells, thereby improving the uniformity of the temperature field distribution and the heat conduction efficiency.

[0018] 3. The upper through hole and the lower through hole are set in the vertical direction in a one-to-one correspondence, which can form a stable directional flow path between the upper and lower flow channels, avoiding short circuit or blind flow of the cooling liquid during the flow process, thereby further improving the liquid exchange efficiency and flow field controllability, and ensuring rapid and uniform heat transfer.

[0019] 4. Two upper liquid holes and two lower liquid holes are set, and are arranged in a relative and coplanar manner on the box body, so that the inflow and outflow paths of the cooling liquid are more balanced in space, which is conducive to the construction of a complete circulation system, improves the circulation coverage of the cooling liquid in the battery pack from the structural design, avoids the problem of "flow dead angle in some areas" in the traditional structure, and improves the liquid exchange uniformity of the system.

[0020] 5. By connecting the upper and lower liquid holes to the four connection ports of the circulation system one by one, precise control of the inflow and discharge paths can be achieved, so that the coolant forms a closed and directional circulation flow in the battery pack, further improving the response speed and efficiency of the cooling system, ensuring timely replacement of coolant in different areas, and reducing cooling lag.

[0021] 6. Valves are installed on each connecting pipe to allow dynamic adjustment of the channel opening and closing status based on temperature data, flexibly controlling the coolant injection and discharge paths, thereby realizing intelligent scheduling of coolant flow, reducing excessive coolant flow in low-temperature areas, focusing cooling capacity on high-temperature areas, and improving the active regulation capability of the thermal management system.

[0022] 7. A temperature sensor is installed in the box to realize real-time monitoring of the coolant temperature, solving the problem of "lack of feedback mechanism and difficulty in dynamically adjusting the cooling strategy" in the existing system. It provides basic data support for subsequent cooling path adjustment based on temperature data, and improves the sensitivity and intelligence level of system temperature control.

[0023] 8. By arranging four temperature sensors coplanarly inside the battery pack, not only the temperature detection coverage is improved, but also the accuracy of locating high-temperature areas is enhanced, facilitating regional differentiated cooling control, thereby further improving the spatial uniformity of the temperature field, shortening system response time, and improving overall safety and cooling efficiency.

[0024] 9. By proposing a temperature control method that dynamically allocates injection and discharge ports based on real-time temperature sorting results, the coolant can be preferentially injected into high-temperature areas and discharged from low-temperature areas, dynamically regulating the flow direction of the coolant, significantly improving the cooling efficiency in high-temperature areas, and solving the problems of "slow response and local overheating" in existing static injection and discharge systems. This effectively improves the intelligence and safety performance of battery pack thermal management, and is particularly suitable for high-temperature loads or abnormal heating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 Schematic diagram of the structure of an immersion liquid-cooled battery pack in an embodiment of the present invention; Figure 2 Schematic diagram of part of the structure of the immersion liquid-cooled battery pack in an embodiment of the present invention Figure 1 ; Figure 3Part structure diagram of an immersed liquid-cooled battery pack in an embodiment of the present application Figure 2 ; Figure 4 Part structure diagram of an immersed liquid-cooled battery pack in an embodiment of the present application Figure 3 ; Figure 4 Part structure diagram of an immersed liquid-cooled battery pack in an embodiment of the present application Figure 6 ; Figure 7 Structure diagram of a battery module in an embodiment of the present application Figures 1-7 Structure diagram of a rubber strip and a battery cell in an embodiment of the present application

[0027] In the figure: 1, box body; 2, end cover; 3, upper liquid hole; 4, lower liquid hole; 5, explosion-proof valve; 6, wiring assembly; 7, communication assembly; 8, first channel; 9, second channel; 10, wire harness isolation plate; 11, end plate; 12, upper through hole; 13, lower through hole; 14, upper flow plate; 15, lower flow plate; 16, steel belt; 17, rubber strip; 18, battery cell; 19, battery module. DETAILED DESCRIPTION

[0028] In order to make the application purposes, features, and advantages of the present application more obvious and easy to understand, the following will use specific embodiments and drawings to clearly and completely describe the technical solutions protected by the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present patent.

[0029] With the rapid development of new energy vehicles, energy storage power stations and other fields, lithium batteries have become the mainstream choice due to their high energy density, long cycle life and other advantages. However, the performance and life of the battery are highly dependent on temperature management, and the ideal working temperature needs to be controlled between 25℃-45℃, and too high or too low will cause capacity attenuation, thermal runaway, and even explosion and other problems.

[0030] At present, the mainstream cooling method of energy storage battery pack in the market is mainly air-cooled cooling and cold plate liquid cooling. Although the air-cooled battery pack has the advantages of low cost and simple structure, its shortcomings in heat dissipation efficiency, temperature uniformity and influence of environmental temperature limit its application range; liquid cooling relies on indirect contact cooling plate, and there are problems of large thermal resistance and complex structure, and the cold plate liquid cooling needs to pass through multiple structures (such as battery module, shell and cooling plate) to transfer heat, and the thermal resistance is superimposed to reduce the efficiency, and it cannot uniformly cover the surface of all battery cells; in addition, some cooling medium (such as ethylene glycol solution) has the risk of electric conduction, and the metal heat sink increases the weight and cost, which affects the energy density of the battery pack. The above two cooling methods are difficult to realize rapid temperature equalization in high temperature or overcharge scene, which increases the risk of fire accident of energy storage power station; in order to solve the above problems, the battery cooling technology field appears the immersed liquid cooling technology, which immerses the battery in special insulating cooling liquid (such as fluorinated liquid and silicon oil), completely isolates from oxygen, directly absorbs heat through cooling medium, reduces thermal resistance and improves the heat dissipation efficiency of the system. Compared with the traditional air-cooled cooling and liquid cooling plate cooling technology, this method can make the temperature field in the battery pack more uniform, and has faster cooling speed and shorter cooling time, which can improve the safety performance of the energy storage power station, so it has higher efficiency and better performance in battery cooling.

[0031] However, the existing immersed liquid-cooled battery pack usually places the cooling liquid in the battery pack or sets a cooling liquid circulation system at a fixed position. Although the cooling liquid can take away the heat generated by the battery during operation to some extent, due to the limited flow path of the cooling liquid in the battery pack, there is a phenomenon of slow flow or even stagnation in local areas, resulting in uneven liquid exchange, and the update speed of the cooling liquid between each battery cell or module is significantly different. This uneven liquid exchange condition causes the temperature field to be unevenly distributed in space, and some areas may overheat or cool slowly, thereby limiting the overall cooling efficiency and response speed of the system, prolonging the cooling time, and affecting the safety and service life of the energy storage system, which is not conducive to the realization of efficient and stable energy management goals.

[0032] The present application provides an immersed liquid-cooled battery pack, a battery pack temperature control method and a medium, which solves the problem of uneven liquid exchange of the cooling liquid in the immersed liquid-cooled battery pack in the prior art, which may cause overheating or slow cooling in some areas.

[0033] Embodiment one: The present application provides an immersed liquid-cooled battery pack, as shown in Figure 2 The box body 1 is provided with a circulation system. An upper flow plate 14 is arranged above the battery module 19 in the box 1, and a lower flow plate 15 is arranged below the battery module 19 in the box 1, at least one upper liquid hole 3 and at least one lower liquid hole 4 are formed in the box 1, the upper liquid hole 3 is arranged above the upper flow plate 14, and the lower liquid hole 4 is arranged below the lower flow plate 15; The upper liquid hole 3 and the lower liquid hole 4 are connected with the circulation system through a connecting pipeline; A plurality of upper through holes 12 are arranged on the upper flow plate 14, and a plurality of lower through holes 13 are arranged on the lower flow plate 15; In this way, by arranging the circulation system on the box 1, arranging the upper flow plate 14 and the lower flow plate 15 above and below the battery module 19, combining the through hole design and the arrangement of the upper and lower liquid holes 4, the cooling liquid can form an organized flow path in the battery pack, solving the problems of "limited flow path and liquid retention" in the existing immersion liquid cooling mode, significantly improving the flow uniformity and update rate of the cooling liquid in the battery pack, thereby improving the overall cooling efficiency and response speed and enhancing the system thermal management capability.

[0034] In this embodiment, the battery module 19 includes a plurality of battery cells 18 arranged side by side, at least two adhesive strips 17 are arranged between every two adjacent battery cells 18, the adhesive strips 17 are vertically arranged between the adjacent two battery cells 18, and a fluid channel is formed between the two adhesive strips 17 and the two side battery cells 18. A wire harness isolation plate 10 is arranged at the upper end and the lower end of each battery module 19.

[0035] In this way, by arranging the vertical adhesive strips 17 between the adjacent battery cells 18 and forming the channels, an effective flow path of the cooling liquid between the battery cells 18 is constructed, so that the cooling liquid can penetrate all the gaps between the battery cells 18, avoid heat accumulation in a local area, effectively alleviate the defect that the traditional liquid cooling cannot uniformly cover the surface of the battery cells 18, and thereby improve the uniformity of the temperature field distribution and the heat conduction efficiency.

[0036] For example, please refer to Figure 6 , Figure 7 , Figure 6 In actual implementation, the width of the adhesive strip 17 and the number of the adhesive strips 17 can be set according to actual needs by those skilled in the art.

[0037] In this embodiment, the thermal conductivity of the adhesive strip 17 is small, a long and narrow channel is formed between the adhesive strip 17 and the battery cell 18, the cooling liquid directly contacts the large surface of the battery cell 18, the heat exchange area is increased, the surface temperature of the battery cell 18 can be effectively reduced, and then the heat dissipation effect of the battery module 19 is improved.

[0038] In addition, it can be understood that the adhesive strip 17 isolates the adjacent battery cells 18, can effectively prevent the heat diffusion caused by the thermal runaway of the battery cells 18, and improves the safety of the immersion liquid-cooled battery PACK.

[0039] For each battery module 19, the battery cells 18 of the battery module 19 are distributed side by side to form a battery cell row, and the battery cells 18 in the battery cell row are connected in series.

[0040] Please refer to Figure 2 , each of the two ends of the battery module 19 is provided with an end plate 11, and the end plate 11 and the battery module 19 are fixed by silica gel. The adjacent battery cells 18 in the battery module 19 are connected to the side wall of the adhesive tape 17 by structural adhesive, and then the two end plates 11 and the battery cell rows between the two end plates 11 and the adhesive tapes 17 in the battery cell rows are integrally bundled by using the steel belt 16, that is, the battery module 19 is formed.

[0041] The number of battery modules 19 is at least two, and each battery module 19 is connected in series.

[0042] In specific implementation, the number of battery modules 19 and the number of battery cells 18 in the battery module 19 can be set by those skilled in the art according to actual conditions.

[0043] In this embodiment, the number of battery cells 18 in each battery module 19 is equal.

[0044] It can be understood that in this embodiment, each battery module 19 is integrated on the bottom wall of the box body 1.

[0045] As an illustrative embodiment of the present application, each battery module 19 is distributed in parallel in the box body 1, and a first channel 8 is left between adjacent battery modules 19. Among the parallel distributed battery modules 19, the second channel 9 is arranged between the battery modules 19 distributed on both sides and the inner side wall of the box body 1.

[0046] As Figure 4 shown, there are four battery modules 19 in this embodiment, and the four battery modules 19 are aligned at both ends and distributed in parallel and at intervals in the box body 1: three first channels 8 are formed between the four battery modules 19; among the four battery modules 19, the second channel 9 is arranged between the battery modules 19 distributed on both sides and the inner side wall of the box body 1.

[0047] In this embodiment, the number of upper through holes 12 and lower through holes 13 is the same and is arranged one by one in the vertical direction. In this way, the upper through holes 12 and the lower through holes 13 are arranged one by one in the vertical direction, which can form a stable directional flow path between the upper and lower flow channels, avoid short circuit or blind flow of the cooling liquid during flow, and further improve the liquid exchange efficiency and flow field controllability, and ensure rapid and uniform heat transfer.

[0048] Optionally, the projection of the upper through hole 12 on the bottom wall of the box body 1 is located in the lower heat dissipation channel and coincides with the lower through hole 13. The upper through hole 12 and the lower through hole 13 arranged above the channel are sequentially arranged along the channel direction.

[0049] Optionally, the top wall of the box body 1 is the end cover 2 of the box body 1, and the explosion-proof valve 5 is arranged on the end cover 2. The upper through hole 12 is arranged on the upper flow plate 14 on the inner wall of the end cover 2, as shown in ​ Optionally, the top wall of the box body 1 is the end cover 2 of the box body 1, and the explosion-proof valve 5 is arranged on the end cover 2. The upper through hole 12 is arranged on the upper flow plate 14 on the inner wall of the end cover 2, as shown in ​ Optionally, the top wall of the box body 1 is the end cover 2 of the box body 1, and the explosion-proof valve 5 is arranged on the end cover 2. The upper through hole 12 is arranged on the upper flow plate 14 on the inner wall of the end cover 2, as shown in ​

[0050] In this embodiment, the battery modules 19 are connected in series to form a power supply, and the power supply is provided with a wiring assembly 6 and a communication assembly 7. The wiring assembly 6 and the communication assembly 7 penetrate the box body 1 and are arranged on the outer side wall of the box body 1.

[0051] By using the upper through hole 12 and the lower through hole 13 together, the cooling liquid can be sent to multiple positions in the cooling liquid filling cavity where the battery pack is located, and the heat generated by the module can be quickly taken away, which helps to better reduce the temperature of the battery, improve the uniformity of the temperature field in the battery pack, shorten the cooling liquid flow path, reduce the flow resistance, and improve the convective heat transfer coefficient. Therefore, it is helpful to improve the cooling speed, shorten the cooling time, and improve the energy storage safety performance.

[0052] In this embodiment, the number of the upper liquid holes 3 and the lower liquid holes 4 is two. The upper liquid holes 3 are arranged on the upper end face of the box body 1, and the two upper liquid holes 3 are oppositely arranged on the box body 1. The two lower liquid holes 4 are arranged on the side end face of the box body 1 and are correspondingly arranged on the box body 1. The two upper liquid holes 3 and the two lower liquid holes 4 are coplanarly arranged. In this way, two upper liquid holes 3 and two lower liquid holes 4 are arranged, and the two upper liquid holes 3 and the two lower liquid holes 4 are oppositely arranged and coplanarly arranged on the box body 1. The inflow and outflow paths of the cooling liquid are more balanced in space, which is conducive to building a complete circulation system, improving the circulation coverage of the cooling liquid in the battery pack from the structural design, avoiding the "partial area flow dead angle" problem in the traditional structure, and improving the liquid exchange uniformity of the system.

[0053] In this embodiment, the circulation system is provided with four connection ports, and the upper liquid holes 3, the lower liquid holes 4 and the connection ports are connected one by one through the connection pipelines. In this way, by connecting the upper liquid holes 3 and the lower liquid holes 4 with the four connection ports of the circulation system one by one, the inflow and outflow paths can be accurately controlled, so that the cooling liquid forms a closed directional circulation flow in the battery pack, further improving the response speed and efficiency of the heat dissipation system, ensuring that the cooling liquid in different areas is replaced in time, and reducing the cooling lag phenomenon.

[0054] In the embodiment, a valve is arranged on each connecting pipe; In this way, the arrangement of the valve on each connecting pipe allows dynamic adjustment of the opening and closing state of the channel according to the temperature data, flexible control of the injection and discharge paths of the coolant, intelligent scheduling of the flow direction of the coolant, reduction of excessive flow of the coolant in the low-temperature region, focusing of the cooling capacity on the high-temperature region, and improvement of the active regulation capability of the thermal management system.

[0055] In the embodiment, at least two temperature sensors are arranged inside the box 1, and the temperature sensors are used to detect the temperature of the coolant. In this way, the arrangement of the temperature sensors in the box 1 can realize real-time monitoring of the temperature of the coolant, solve the problem of "lack of feedback mechanism and difficulty in dynamically adjusting the cooling strategy" of the existing system, provide basic data support for subsequent cooling path adjustment based on temperature data, and improve the sensitivity and intelligent level of the system temperature control.

[0056] In the embodiment, four temperature sensors are arranged inside the box 1, and the temperature sensors are arranged in the same plane as the upper liquid holes 3 and the lower liquid holes 4. The temperature sensors are arranged on the upper flow plate 14 and the lower flow plate 15, and the temperature sensors closest to any upper liquid hole 3 and lower liquid hole 4 are different.

[0057] In this way, by arranging four temperature sensors in the same plane inside the battery pack, the coverage of temperature detection is improved, and the positioning accuracy of the high-temperature region is enhanced, which facilitates the realization of regional differentiated cooling control, thereby further improving the spatial uniformity of the temperature field, shortening the system response time, and improving the overall safety and cooling efficiency.

[0058] Embodiment Two The application provides a temperature control method for the immersed liquid-cooled battery pack as described in Embodiment One, which comprises the following steps: Step S1, presetting a high-temperature threshold Tmax and a low-temperature threshold Tmin; Step S2, acquiring temperature data Ti of the four temperature sensors in real time, i=1, 2, 3, 4. Within a time window t, if Tmin<Ti<Tmax, jump to step S4; otherwise, jump to step S3; Step S3, if the abnormal temperature data exceeds the high-temperature threshold Tmax, the battery pack is powered off and an alarm is given. If the abnormal temperature data is lower than the low-temperature threshold Tmin, jump to step S4; Step S4, sorting the four temperature data. According to the sorting result, the connecting ports corresponding to the upper liquid holes and / or the lower liquid holes close to the two temperature sensors with high temperature are set as the injection ports, and the connecting ports corresponding to the other two upper liquid holes and / or the lower liquid holes are set as the discharge ports, and then jump to step S2; In this way, by proposing a temperature control method based on real-time temperature sequencing results to dynamically allocate the liquid injection port and the liquid discharge port, the cooling liquid is preferentially injected into the high-temperature area and discharged from the low-temperature area, the flow direction of the cooling liquid is dynamically regulated, the cooling efficiency of the high-temperature area is significantly improved, the problems of "slow response and local overheating" of the existing static injection and discharge system are solved, the intelligent degree and safety performance of the battery pack thermal management are effectively improved, and the method is particularly suitable for high-temperature load or abnormal heating working conditions.

[0059] Embodiment three: The application provides a computer readable storage medium, which stores computer instructions, and when a computer reads the computer instructions in the storage medium, the computer executes the temperature control method according to the embodiment two.

[0060] 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 limit the present specification for the person skilled in the art. Although it is not explicitly stated here, the person skilled in the art can make various modifications, improvements and corrections to the present specification. Such modifications, improvements and corrections are suggested in the present specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present specification.

[0061] In addition, unless the claims explicitly state otherwise, the order of the processing elements and sequences described in the specification, the use of numerals and letters, or the use of other names is not intended to limit the order of the processes and methods of the present specification. Although some currently considered useful embodiments of the application are discussed in the above disclosure through various examples, it should be understood that such details are only for the purpose of illustration, and the additional claims are not limited to the disclosed embodiments, on the contrary, the claims are intended to cover all modifications and equivalent combinations that meet the spirit and scope of the embodiments of the present specification. For example, although the system components described above can be realized by hardware devices, they can also be realized by only software solutions, such as installing the described system on existing servers or mobile devices.

[0062] Similarly, it should be noted that, in order to simplify the description of the present disclosure and to help understand one or more embodiments of the application, the description of the embodiments of the present specification sometimes combines various features into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of the present specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0063] In some embodiments, numbers that describe amounts, dimensions, and so forth, are used in the description of the embodiments. It should be understood that such numbers are used only to illustrate certain embodiments and that the scope of the embodiments is not limited to the numbers. In some examples, such numbers are modified by the modifier "about" or "approximately." Unless otherwise indicated, "about" or "approximately" means ±20% of the value stated. Accordingly, in some embodiments, numerical parameters in the specification and claims are approximations that can vary depending on the desired properties sought to be obtained by the individual embodiments. In some embodiments, numerical parameters are approximations that can vary from the numerical parameters set forth in the specification and claims. In some embodiments, numerical parameters should be considered in the context of the number of significant digits in which they are set forth. Although the numerical ranges and parameters setting forth the broad scope of the embodiments are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values set forth in the specific examples are provided to be as precise as practicable.

[0064] Finally, it should be understood that the embodiments described herein are merely exemplary of the principles of the embodiments. Other variations having essentially the same structure and function are within the scope of the embodiments. Accordingly, the embodiments described herein are not limited to that precisely as shown and described.

Claims

1. An immersion liquid-cooled battery pack, comprising a box (1) and a battery module (19) arranged inside the box (1), characterized in that: The box body (1) is provided with a circulation system; Above the battery module (19) in the box body (1), an upper flow plate (14) is provided. Below the battery module (19) in the box body (1), a lower flow plate (15) is provided. At least one upper liquid hole (3) and at least one lower liquid hole (4) are opened on the box body (1). The upper liquid hole (3) is arranged above the upper flow plate (14), and the lower liquid hole (4) is arranged below the lower flow plate (15); Both the upper liquid hole (3) and the lower liquid hole (4) are connected to the circulation system through connecting pipes; A number of upper through holes (12) are provided on the upper flow plate (14), and a number of lower through holes (13) are provided on the lower flow plate (15).

2. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The battery module (19) includes a number of battery cells (18) arranged side by side. At least two rubber strips (17) are provided between every two adjacent battery cells (18). The rubber strips (17) are vertically arranged between two adjacent battery cells (18), and fluid channels are formed between the two rubber strips (17) and the battery cells (18) on both sides.

3. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The number of the upper through holes (12) is the same as that of the lower through holes (13), and they are arranged in one-to-one correspondence in the vertical direction.

4. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The number of both the upper liquid holes (3) and the lower liquid holes (4) is two. The upper liquid holes (3) are located on the upper end face of the box body (1), and the two upper liquid holes (3) are oppositely arranged on the box body (1). The two lower liquid holes (4) are arranged on the side end face of the box body (1) and are correspondingly arranged on the box body (1). The two upper liquid holes (3) and the two lower liquid holes (4) are arranged on the same plane.

5. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The circulation system is provided with four connection ports, and the upper liquid hole (3), the lower liquid hole (4) and the connection ports are connected in one-to-one correspondence by connecting pipes.

6. The immersion liquid-cooled battery pack according to claim 5, characterized in that: A valve is provided on each connecting pipe.

7. The immersion liquid-cooled battery pack according to claim 4, characterized in that: At least two temperature sensors are arranged inside the box body (1), and the temperature sensors are used to detect the temperature of the coolant.

8. The immersion liquid-cooled battery pack according to claim 7, characterized in that: Four temperature sensors are arranged inside the box body (1), and the temperature sensors are arranged on the same plane as the upper liquid hole (3) and the lower liquid hole (4).

9. A temperature control method, characterized in that: For the immersion liquid-cooled battery pack as described in claim 8, it includes the following steps: Step S1, preset a high-temperature threshold Tmax and a low-temperature threshold Tmin; Step S2, obtain the temperature data Ti of the four temperature sensors in real time, i = 1, 2, 3, 4. Within the time window t, if Tmin < Ti < Tmax, jump to step S4; otherwise, jump to step S3; Step S3, if the abnormal temperature data exceeds the high-temperature threshold Tmax, cut off the power supply of the battery pack and give a warning. If the abnormal temperature data is lower than the low-temperature threshold Tmin, jump to step S4; Step S4, sort the four temperature data. According to the sorting result, set the connection ports corresponding to the upper liquid hole and / or the lower liquid hole of the two temperature sensors close to the higher temperature as the liquid injection ports, and set the connection ports corresponding to the other two upper liquid holes and / or lower liquid holes as the liquid discharge ports, and then jump to step S2.

10. A computer-readable storage medium, characterized in that The storage medium stores computer instructions. When the computer reads the computer instructions in the storage medium, the computer executes the temperature control method as described in claim 9.

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