An immersion heat management combined cell structure

Abstract

The application discloses an immersed heat management combined battery cell structure and relates to the field of batteries.The immersed heat management combined battery cell structure comprises a shell, and the shell is internally arranged with combined partitions.The shell is provided with flowing cooling liquid, and the cooling liquid fills the interspace formed between the shell and each combined partition.The cooling liquid flows into the shell from one end of the shell and flows out of the shell from the other end of the shell.Each combined partition is composed of a square shell and a soft package battery cell which is arranged in the square shell in a laminated mode.The square shell is also provided with a first cooling medium, and the first cooling medium fills the interspace formed between the square shell and the soft package battery cell.Through partition, the temperature difference between system-level battery cells is adjusted, so that each combined partition always performs charging and discharging work in a healthy temperature range.The design of the scheme can better realize heat conduction and temperature control, can allow the battery arrangement density to be larger, and can further realize better volume utilization rate.Immersed cooling can ensure that the battery always works in a healthy temperature range, regardless of charging or discharging conditions.

Description

Technical Field

[0001] This invention relates to the field of batteries, specifically to an immersion thermal management combined cell structure. Background Technology

[0002] As a key component of pure electric vehicles, the performance of power batteries directly affects the development prospects of pure electric vehicles. Commonly used lithium-ion batteries are mainly divided into three categories in terms of structure and assembly: prismatic, cylindrical, and pouch. Prismatic and cylindrical lithium-ion batteries primarily use hard shells such as aluminum alloy and stainless steel, while pouch lithium-ion batteries use aluminum-plastic film for their shells.

[0003] The advantages of pouch cells are high energy density, high heat dissipation capacity, and good power and lifespan. The disadvantages of pouch cells are poor mechanical strength, difficulty in fixing, low safety, easy bulging, and relatively low consistency.

[0004] The advantages of prismatic and cylindrical battery cells are good mechanical strength, easy modularization and standardization, good safety, and simple thermal management. However, they also have some disadvantages, such as lower specific energy, poor heat dissipation, high requirements for cover plate design, and high cost.

[0005] As users increasingly demand longer driving ranges for electric vehicles, faster charging times, and enhanced safety, key breakthroughs are needed in power battery energy density, high and low temperature performance, fast charging, and safety. Currently, most new energy vehicle power battery pack cooling systems employ liquid cooling. Coolant flows into the cooler from the inlet, passes through several parallel pipes, absorbs heat, and then flows out to the vehicle's air conditioning system. For example, existing technology (application number: 201420265406.8; title: A Multi-stage Thermal Management Power Battery Pack) has proposed a similar solution of injecting coolant into individual branch pipes for cooling. However, in this technology, the pipe design in the power battery pack is not only structurally complex and difficult to design, but also increases manufacturing and assembly costs, impacting the vehicle's driving range. Furthermore, it occupies a large amount of space in the Y-axis direction of the battery pack, and the width of the pipes supplying coolant is limited, resulting in ineffective cooling. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a technical solution for an immersion thermal management battery. By redesigning the battery's assembly structure and assembling it with a soft-pack cell and a rigid prismatic shell, it greatly promotes improved mechanical strength, modularity, and standardization. At the same time, it eliminates the need for the traditional method of setting cooling pipes inside the battery. This design can improve space utilization by about 15%, better achieve heat conduction and temperature control, and allow for a higher battery density, thus achieving better volume utilization.

[0007] Specifically, the detailed technical solution proposed in this invention is as follows:

[0008] An immersion thermal management combined cell structure includes a housing, wherein at least one combined partition is arranged inside the housing;

[0009] The housing is provided with a flowing coolant that fills the gaps formed between the interior of the housing and each of the combined partitions; the coolant flows in from one end of the housing and flows out from the other end of the housing.

[0010] Each of the combined partitions consists of a square shell and pouch cells stacked in the square shell; the square shell also contains a first cooling medium, which fills the gaps formed between the square shell and the pouch cells.

[0011] Furthermore, the first cooling medium is an insulating phase change material, and the square shell is configured as a sealed structure.

[0012] Furthermore, the first cooling medium is an insulating fluid medium material;

[0013] The square shell includes a body and positive electrode cover plates and negative electrode cover plates welded to the left and right sides of the body;

[0014] The positive electrode cover plate has an inlet hole, and the negative electrode cover plate has an outlet hole; the first cooling medium enters the square shell through the inlet hole and flows out through the outlet hole.

[0015] Furthermore, an inlet branch pipe is connected to the inlet hole, and an outlet branch pipe is connected to the outlet hole;

[0016] The inlet branch pipes of each of the combined zones are connected in parallel and connected to the liquid front conduit, and the outlet branch pipes of each of the combined zones are connected in parallel and connected to the liquid rear conduit.

[0017] Furthermore, each of the liquid inlet branch pipes is equipped with a control valve to control the flow rate of the first cooling medium.

[0018] Furthermore, each of the combined partitions is also provided with an NTC thermistor, which is configured to monitor the temperature of the pouch cell in the prismatic housing.

[0019] Furthermore, the pouch cells inside the square shell are stacked one-to-one, with the positive terminals of all the pouch cells connected together and the negative terminals of all the pouch cells connected together.

[0020] Furthermore, the pouch cell has an aluminum-plastic film housing, and an electrode assembly and electrolyte sealed within the aluminum-plastic film housing.

[0021] Furthermore, the first cooling medium is a fluorinated liquid, an oil-based medium, or a synthetic ester-based medium.

[0022] Furthermore, the positive electrode cover plate also includes a first explosion-proof valve and a positive electrode post; the negative electrode cover plate also includes a second explosion-proof valve and a negative electrode post; the body is made of aluminum.

[0023] The beneficial effects achieved by adopting this technical solution are as follows:

[0024] Utilizing pouch cells, which have a high core-to-particle ratio, improves volumetric efficiency and energy density, while also offering lower manufacturing costs. Assembling pouch cells with rigid prismatic cells provides superior mechanical strength, ease of modularization and standardization, and this design can increase PACK space utilization by approximately 15%. Furthermore, improved thermal conductivity and temperature control allow for higher battery density, resulting in even better volumetric efficiency. Simultaneously, this innovative structural design allows the pouch cells to be immersed in insulating coolant. In the event of a safety hazard, the pouch cell may bulge and crack; whether due to breakage or puncture, the insulating coolant immediately dissipates any heat generated by thermal runaway or damage. Introducing the insulating coolant into the cell structure simplifies the overall pack flow channel design, maximizing direct cooling. Additionally, zoned temperature control between cells at the system level ensures that each zone operates within a healthy temperature range for charging and discharging. The improved thermal conductivity and temperature control allow for higher charging and discharging rates. Immersion cooling ensures that the battery always operates within a healthy temperature range, regardless of charging or discharging conditions. This is highly beneficial for improving battery life and reducing battery degradation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the immersion thermal management combined battery cell structure in this solution.

[0026] Figure 2 This is a plan view of the interior of the combined partition.

[0027] Figure 3 This is a structural diagram of a square shell.

[0028] Among them: 100 shell, 101 combined partition, 200 square shell, 201 soft-pack cell, 202 positive electrode cover plate, 203 negative electrode cover plate. Detailed Implementation

[0029] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0030] This embodiment provides an immersion thermal management combined cell structure. By adopting the combined cell structure proposed in this solution, the utilization rate of the internal space of the cell can be improved, better heat conduction and temperature control can be achieved, and a higher battery density can be allowed to achieve better volume utilization.

[0031] In this plan, see Figures 1-3 The proposed immersion thermal management combined battery cell structure includes a housing 100, within which at least one combined partition 101 is arranged. In this embodiment, multiple combined partitions 101 are provided, and the multiple combined partitions 101 are distributed and arranged inside the housing 100. At the same time, a flowing coolant is provided inside the housing 100, which fills the gaps formed between the housing 100 and each combined partition 101. The coolant flows in from one end of the housing 100 and flows out from the other end of the housing 100.

[0032] In this embodiment, in order to enable each combined partition 101 to effectively dissipate heat, heat exchange is achieved by introducing coolant into the housing 100; that is, coolant is directly injected into the housing 100, so that the coolant fills the housing 100 and flows, and each combined partition 101 is immersed in the coolant, and the flow of the coolant carries away the heat generated by each combined partition 101.

[0033] In this embodiment, each combined partition 101 consists of a square shell 200 and pouch cells 210 stacked within the square shell 200; simultaneously, the square shell 200 also contains a first cooling medium, which fills the gaps formed between the interior of the square shell 200 and the pouch cells 210. The heat generated by the pouch cells 210 will also be exchanged through the first cooling medium.

[0034] In this embodiment, a two-stage immersion cooling scheme is adopted to effectively dissipate heat from the combined battery cell structure. The first stage of cooling utilizes a first cooling medium to cool the interior of each combined section 101 (i.e., all the pouch cells 210 within the prismatic shell 200) and control the temperature. The second stage of cooling utilizes flowing coolant to exchange heat with the exterior of each combined section 101 (i.e., all the combined sections 101 within the shell 100), achieving complete heat dissipation. Through this two-stage immersion cooling scheme, regardless of whether it's mechanical or thermal abuse, when a battery cell experiences thermal runaway, the coolant or the first cooling medium can immediately dissipate any heat generated by thermal runaway or damage. Therefore, this invention offers advantages such as good safety, high specific energy, good heat dissipation capacity, good power and lifespan, and simple thermal management.

[0035] The above technical improvements are based on experimental research conducted since power batteries have gradually become the main energy source.

[0036] Currently, power batteries are one of the key components of pure electric vehicles, and their performance directly affects the development prospects of pure electric vehicles. Commonly used lithium-ion batteries are mainly divided into three categories in terms of structure and assembly: prismatic, cylindrical, and pouch. Prismatic and cylindrical lithium-ion batteries primarily use hard shells such as aluminum alloy and stainless steel, while pouch lithium-ion batteries use aluminum-plastic film for their shells.

[0037] The advantages of pouch cells are high energy density, high heat dissipation capacity, and good power and lifespan. The disadvantages of pouch cells are poor mechanical strength, difficulty in fixing, low safety, easy bulging, and relatively low consistency.

[0038] The advantages of prismatic and cylindrical battery cells are good mechanical strength, easy modularization and standardization, good safety, and simple thermal management. However, they also have some disadvantages, such as lower specific energy, poor heat dissipation, high requirements for cover plate design, and high cost.

[0039] As users increasingly demand longer driving ranges for electric vehicles, faster charging times, and enhanced safety, it becomes crucial to focus on breakthroughs in power battery energy density, high and low temperature performance, fast charging, and safety performance.

[0040] Therefore, this solution combines the characteristics of pouch cells and prismatic casings. Assembling pouch cells with a rigid prismatic casing results in good mechanical strength, ease of modularization and standardization. This design can improve PACK space utilization by approximately 15%. Furthermore, better thermal conductivity and temperature control allow for higher battery density, leading to better volume utilization. Simultaneously, this solution utilizes an innovative structural design to immerse the pouch cells in insulating coolant. In the event of a safety hazard, the pouch cell may bulge and crack, whether due to breakage or puncture. The insulating coolant can immediately dissipate any heat generated by thermal runaway or damage. Introducing the insulating coolant into the cell structure simplifies the overall pack flow channel design, maximizing direct cooling. Additionally, zoning allows for temperature difference regulation between cells at the system level, ensuring that each combined zone operates within a healthy temperature range for charging and discharging. Better thermal conductivity and temperature control allow the battery to operate at higher charging and discharging rates. Immersion cooling ensures that the battery always operates within a healthy temperature range, regardless of charging or discharging conditions.

[0041] Therefore, when manufacturing the combined cell structure of this scheme, multiple individual soft-pack cells must first be manufactured. These multiple individual soft-pack cells are then stacked to obtain combined batteries of various thicknesses. These combined batteries will then be arranged in a square shell 200. It is important to note that the thickness, length, and width of the square shell 200 must be sufficient to allow the stacked combined batteries to be smoothly inserted into the shell. More importantly, sufficient space must be ensured to inject the first cooling medium into the shell of the square shell 200. In other words, the first cooling medium is arranged to fill all the gaps between the individual soft-pack cells and the shell of the square shell 200.

[0042] By utilizing the primary cooling medium here, the heat generated by the pouch cell during operation is converted, thus achieving primary cooling.

[0043] Furthermore, the pouch cells inside the square shell 200 are stacked one-to-one, with the positive terminals of all the pouch cells connected together and the negative terminals of all the pouch cells connected together.

[0044] Furthermore, the pouch cell has an aluminum-plastic film housing, and an electrode assembly and electrolyte sealed within the aluminum-plastic film housing.

[0045] In this embodiment, the first cooling medium provides two different scenarios.

[0046] Scenario 1: The first cooling medium is an insulating phase change material, and the square shell 200 is configured as a sealed structure. That is, when the first cooling medium is an insulating phase change material, the square shell 200 needs to meet the requirements of airtightness.

[0047] The phase change material here can be understood as a material whose physical state can change with temperature. For example, when the pouch cell inside the prismatic shell 200 is not working, the first cooling medium exhibits one physical state. As the pouch cell begins to work and gradually generates heat, the first cooling medium will gradually exhibit another physical state. During the transition between these two different physical states, the heat generated within the prismatic shell 200 will be absorbed. By using the phase change material to switch between these two different physical states, a heat exchange effect is achieved, thereby controlling the temperature of the pouch cell.

[0048] Scenario 2: The first cooling medium is an insulating fluid medium material; that is, the first cooling medium is in fluid form, and the heat gradually generated when the soft-pack battery cell starts to work will be carried away by the flowing first cooling medium; by using a flowing heat exchange medium, compared with Scenario 1, more efficient heat conduction and heat exchange capacity can be achieved, and the temperature control effect is also greatly improved.

[0049] Therefore, in this embodiment, the material of the first cooling medium is preferably an insulating fluid medium material.

[0050] Furthermore, the first cooling medium is a fluorinated liquid, an oil-based medium, or a synthetic ester-based medium.

[0051] In this embodiment, the square shell 200 includes a body 201 and a positive electrode cover plate 202 and a negative electrode cover plate 203 welded to the left and right sides of the body 201. An inlet hole is provided in the positive electrode cover plate 202, and an outlet hole is provided in the negative electrode cover plate 203. As mentioned above, a first cooling medium with flow characteristics enters the square shell 200 through the inlet hole and flows out through the outlet hole, thereby achieving efficient heat exchange.

[0052] Furthermore, the positive electrode cover plate 202 also includes a first explosion-proof valve and a positive electrode post; the negative electrode cover plate 203 also includes a second explosion-proof valve and a negative electrode post; the body 201 is made of aluminum.

[0053] By adopting the above structure design, multiple battery packs can be designed and arranged in sequence in the housing 100. In order to further facilitate heat dissipation, all battery packs in the housing 100 are divided into partitions, which forms the combined partitions 101 mentioned above. Each combined partition 101 is composed of a square shell 200 and soft-pack cells 210 stacked in the square shell 200.

[0054] Since each combined section 101 is an independent entity, in this embodiment, an inlet branch pipe is connected to the liquid inlet hole of the positive electrode cover plate 202, and an outlet branch pipe is connected to the liquid outlet hole of the negative electrode cover plate 203; and the inlet branch pipes of each combined section 101 are connected in parallel and connected to the liquid front conduit, and the outlet branch pipes of each combined section 101 are connected in parallel and connected to the liquid rear conduit.

[0055] Simply put, the liquid front conduit is connected to the cooling medium device (not shown) outside the housing 100, and the cooling medium device (not shown) delivers the first cooling medium to the liquid front conduit; then the first cooling medium is split and flows to the inlet branch pipes connected to each combination section 101, and then enters each square shell 200 through the inlet hole to fill the interior of the square shell 200; after being filled, the first cooling medium will be collected through the outlet hole and outlet branch pipe in sequence, and then collected into the liquid rear conduit for outflow.

[0056] By adopting the above structural design, the cell structure combination of the present invention has the characteristics of good mechanical strength, easy modularization, standardization, and high assembly efficiency, and improves the energy density of individual cells and the whole pack; through two-stage cooling, the flowing coolant and the first cooling medium are introduced into the cell structure for battery-level thermal management. For battery fast charging rate >2.5C, it can achieve more efficient heat conduction and heat exchange capabilities and has good temperature control effect.

[0057] In this embodiment, each inlet branch pipe is equipped with a control valve to control the flow rate of the first cooling medium. That is, the control valve controls the opening and closing of each branch pipe to control the flow rate of the medium, thereby adjusting the temperature difference between the cells in the combined zone 101 by zoning.

[0058] In this embodiment, each combined partition 101 is also provided with an NTC thermistor, which is configured to monitor the temperature of the soft-pack battery cells in the housing 200.

[0059] This is because, from the perspective of the overall heat dissipation path, the combination partitions 101 closer to the outer edge of the housing 100 dissipate heat faster, while those closer to the middle dissipate heat slower. For example, all combination partitions 101 generate heat when they are working. However, it is obvious that the combination partitions 101 located around the perimeter generate less heat than those in the middle. This is because the combination partitions 101 in the middle are surrounded by other combination partitions 101, resulting in poorer heat dissipation in the middle. The combination partitions 101 closer to the outer edge of the housing 100 dissipate heat faster.

[0060] Therefore, an NTC thermistor is also provided in each combined partition 101 to monitor the temperature of different partitions. For example, when the temperature in the middle part is too high, the relevant temperature data obtained by the NTC thermistor is used to drive the opening and closing of the control valve mentioned above to control the temperature difference between the cells. That is, by transmitting the control signal, the control valve in the middle part is fully opened, increasing the flow rate of the combined partition 101 in the middle part. The high-speed flow of the first cooling medium can effectively remove the generated high heat energy.

[0061] Therefore, by adjusting the temperature difference between the 101 zones of the zoning system, the battery can always charge and discharge within a healthy temperature range, resulting in a long battery life.

[0062] To facilitate a deeper understanding, the specific steps involved in fabricating this immersion-type combined cell structure are described below:

[0063] Step 1, Production of pouch cells:

[0064] The battery first goes through the electrode segment production process, where positive electrode sheets, negative electrode sheets, and separators are stacked into electrode groups. The electrode groups then undergo welding, encapsulation, electrolyte injection, and formation processes to complete the production of the soft-pack battery cell assembly.

[0065] Step 2, connection of soft-pack battery cell assembly and negative electrode cover 203:

[0066] The positive and negative tabs of a single pouch cell are respectively corresponding, that is, the positive and negative tabs of all individual pouch cells are located on the same side; so that the pouch cell combination formed has a unified positive and negative pole; multiple pouch cells are stacked, with the positive and negative tabs stacked separately, and the negative cover plate 203 is welded to the outermost surface of the pouch negative tab stacked structure.

[0067] Step 3: Connect the soft-pack battery cell casing and the positive electrode cover 202:

[0068] Multiple pouch cells (i.e., pouch cell assemblies) arranged in layers are pushed into the square shell 200, and the positive electrode cover plate 202 is welded to the outer surface of the pouch positive electrode tab stacked structure. After the above steps are completed, according to general operating practice, the formed positive electrode tab stacked structure and negative electrode tab stacked structure are folded over respectively, so that the two cover plates seal the openings at opposite ends of the square shell 200, and the non-welded surfaces of the two cover plates face the outside of the square shell 200, forming a combined battery.

[0069] Step four, forming the combined cell structure:

[0070] The combined batteries produced in step three are arranged in the housing 100 and partitioned. For example, in this embodiment, the housing 100 is divided into six regions: A, B, C, D, E, and F. Each region is a combined partition 101, and each region contains an individual combined battery.

[0071] Step 5: Set up the connecting branch pipe for the first medium:

[0072] In each combined section 101, an inlet branch pipe is connected to the liquid inlet hole of the positive electrode cover plate 202, and an outlet branch pipe is connected to the liquid outlet hole of the negative electrode cover plate 203; and the inlet branch pipes of each combined section 101 are connected in parallel and connected to the liquid front conduit, and the outlet branch pipes of each combined section 101 are connected in parallel and connected to the liquid rear conduit, thereby forming a battery thermal management envelope.

[0073] Step 6: Inject the first cooling medium:

[0074] The battery assembled as described above is injected with a first cooling medium into the liquid front conduit, so that the first cooling medium (i.e., insulating fluid) is injected into the interior of the soft-pack cell assembly through the liquid inlet. The insulating fluid fully fills the gap between the soft-pack aluminum-plastic film and the inner shell of the square shell 200. Heat dissipation or heating is achieved through heat exchange with the insulating fluid, and the insulating fluid is circulated out through the liquid outlet.

[0075] Step 7: Inject coolant

[0076] Coolant is injected into the housing 100 to absorb heat from each combined section 101.

[0077] It should be noted that in step four, each combined zone 101 is equipped with an independent NTC thermistor, specifically arranged above the outer plate of the center line of the combined zone 101, with the inlet and outlet centers horizontally aligned, and the inlet and outlet are labeled IN and OUT. Zones A, B, C, D, E, and F are also included, with zone A further divided into ≥4 smaller zones. The cell temperature is collected by the NTC thermistors in different zones, and the control valve controls the opening and closing of the flow channel and the flow rate based on the temperature feedback, thereby adjusting the temperature difference between the cells in the system hierarchy through zone adjustment.

[0078] In this embodiment, the pouch cell in step one above comprises at least two cells. The pouch cell body has an aluminum-plastic film shell, and electrode assembly and electrolyte sealed within the shell. The cell body has a cuboid structure, with a length L ≥ 300 mm, a width W satisfying 60 mm ≤ W ≤ 120 mm, and a thickness T satisfying 4 mm ≤ T ≤ 12 mm. The pouch cell ensures high energy density, and the chemical system is selectable.

[0079] In this embodiment, the specific structure of the negative electrode cover plate in step two above includes an explosion-proof valve, a negative electrode post, and a liquid outlet. The structural dimension of the liquid outlet is diameter D1: 2mm ≤ D1. The specific structure of the positive electrode cover plate includes an explosion-proof valve, a positive electrode post, and a liquid inlet. The structural dimension of the liquid inlet is diameter D2: 2mm ≤ D1.

[0080] In this embodiment, the square shell in step three above is made of aluminum. The square shell is a cuboid structure, and its structural dimensions are appropriately designed according to the size of the soft package. The length L of the aluminum shell is ≥310mm, the width W satisfies: 70mm≤W≤140mm, and the thickness T satisfies 20mm≤T≤50mm.

[0081] In this embodiment, the insulating liquid (first cooling medium) in step six above can be selected as a fluorinated liquid, oil-based or synthetic ester-based medium. Such insulating liquids require low viscosity, high low-temperature fluidity, high flash point, high durability and stability, high heat dissipation performance, and environmental friendliness.

[0082] In this embodiment, the diameter of the liquid outlet branch pipe in step five above is D3≤D1, the diameter of the liquid inlet branch pipe is D4≤D2, and the diameter of the liquid front conduit and the liquid rear conduit is D5=D3 or D4.

[0083] In this embodiment, NTC (Negative Temperature Coefficient) refers to a thermistor whose resistance decreases exponentially with increasing temperature and has a negative temperature coefficient. NTC wiring configuration: Teflon-sensing wire-Teflon.

[0084] In this embodiment, the thermal management control strategy threshold should be determined based on application scenarios such as driving, slow charging, fast charging, super-fast charging, and stationary driving, taking into account factors such as vehicle economy, power, comfort, and charging time. Under the premise of meeting flow resistance standards, the base flow rate is 14 L / min. The optimal threshold is determined by controlling the opening and closing of the flow channel and the flow rate using the control valve. This should satisfy the following requirements: maximum temperature Tmax ≤ 45℃, ambient temperature difference ≤ 6℃, low temperature difference ≤ 8℃, and high temperature difference ≤ 5℃.

[0085] In the extended example, the inlet branch pipe is designed as multiple branch pipes, and a set of control valves is installed on each branch pipe. Each of the multiple branch pipes corresponds to a different zone. When active liquid cooling is started, the zone with the highest temperature is identified based on the detection results of each NTC, and the control valve on the branch pipe of that zone is opened first (the control valves of other branch pipes are opened only after that). This allows the coolant to come into contact with the pouch cells in that zone first and carry heat, thus improving the timeliness of local heat dissipation and effectively dealing with local high temperature situations.

[0086] Therefore, this technical solution utilizes pouch cells, which have a large core-to-particle ratio, improving volumetric utilization and energy density, while also offering lower processing costs. Assembling pouch cells with a rigid prismatic shell provides good mechanical strength, ease of modularization and standardization, and this design can improve PACK space utilization by approximately 15%. Furthermore, better thermal conductivity and temperature control allow for higher battery density, resulting in even better volumetric utilization. Simultaneously, this solution employs an innovative structural design that immerses the pouch cells in insulating coolant. In the event of a safety hazard, the pouch cell may bulge and crack; whether due to breakage or puncture, the insulating coolant can immediately dissipate any heat generated by thermal runaway or damage. Introducing the insulating coolant into the cell structure simplifies the overall pack flow channel design, maximizing direct cooling. Additionally, zoning allows for temperature difference regulation between cells at the system level, ensuring that each combined zone operates within a healthy temperature range for charging and discharging. Because of the improved thermal conductivity and temperature control, the battery can operate at higher charging and discharging rates. Immersion cooling ensures that the battery always operates within a healthy temperature range, regardless of charging or discharging conditions. This is highly beneficial for improving battery life and reducing battery degradation.

[0087] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0088] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the technical product is in use. They are used only for the convenience of describing the technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the technology. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. Therefore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0089] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0090] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0091] The above are merely preferred embodiments of this technology. It should be noted that, due to the limitations of written expression and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this technology, and can also combine the above-mentioned technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the technical concept and solution to other situations without modification, should all be considered within the scope of protection of this technology.

Claims

1. An immersion thermal management combined battery cell structure, comprising a housing (100), wherein at least one combined partition (101) is arranged within the housing (100); characterized in that, The housing (100) is provided with a flowing coolant that fills the gaps formed between the interior of the housing (100) and each of the combined partitions (101); the coolant flows in from one end of the housing (100) and flows out from the other end of the housing (100); Each of the combined partitions (101) consists of a square shell (200) and a pouch cell (210) stacked in the square shell (200); the square shell (200) also contains a first cooling medium, which fills the gap between the inside of the square shell (200) and the pouch cell (210); The first cooling medium is an insulating fluid medium material; The square shell (200) includes a body (201) and a positive electrode cover plate (202) and a negative electrode cover plate (203) welded to the left and right sides of the body (201). The positive electrode cover plate (202) has a liquid inlet hole, and the negative electrode cover plate (203) has a liquid outlet hole; the first cooling medium enters the square shell (200) through the liquid inlet hole and flows out through the liquid outlet hole; An inlet branch pipe is connected to the inlet hole, and an outlet branch pipe is connected to the outlet hole; The inlet branch pipe of each of the combined sections (101) is connected in parallel and connected to the liquid front conduit, and the outlet branch pipe of each of the combined sections (101) is connected in parallel and connected to the liquid rear conduit. Each of the liquid inlet branch pipes is equipped with a control valve to control the flow rate of the first cooling medium; Each of the combined partitions (101) is also provided with an NTC thermistor, which is configured to monitor the temperature of the pouch cell (210) in the slab (200).

2. The immersion thermal management combined cell structure according to claim 1, characterized in that, The pouch cells (210) inside the square shell (200) are stacked one-to-one, with the positive terminals of all the pouch cells (210) connected together and the negative terminals of all the pouch cells (210) connected together.

3. The immersion thermal management combined cell structure according to claim 1, characterized in that, The pouch cell (210) has an aluminum-plastic film housing (100) and an electrode assembly and electrolyte sealed within the aluminum-plastic film housing (100).

4. The immersion thermal management combined cell structure according to claim 1, characterized in that, The first cooling medium is a fluorinated liquid, an oil-based medium, or a synthetic ester-based medium.

5. The immersion thermal management combined cell structure according to claim 1, characterized in that, The positive electrode cover plate (202) also includes a first explosion-proof valve and a positive electrode post; the negative electrode cover plate (203) also includes a second explosion-proof valve and a negative electrode post; the body (201) is made of aluminum.

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