A multi-layer battery temperature control device and a method of installing the same

Abstract

The present application relates to a kind of multilayer battery temperature control device and its installation method, belong to battery temperature control technical field, solve the uneven heating of battery in prior art and the problems of poor temperature control effect, low temperature control efficiency.A kind of multilayer battery temperature control device, including battery equipment, heat preservation box, refrigerating unit and pipeline;The battery equipment is set in heat preservation box, the refrigerating unit is connected with battery equipment by pipeline, and temperature control is carried out to battery equipment;The battery equipment includes battery pack and temperature control component, and the temperature control component is used to temperature control battery pack;The battery pack includes horizontal retainer, for the effect of fixing and refrigeration temperature control to battery in battery pack;The horizontal retainer includes cold plate inlet, silica gel outer layer, cold plate outlet and aluminum alloy inner layer.The present application is uniformly temperature regulated to entire battery pack by the setting relationship between temperature control component and battery pack, with high efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery temperature control technology, and in particular to a multi-layer battery temperature control device for electric vehicles and its installation method. Background Technology

[0002] The driving range of electric vehicle batteries is one of the key factors affecting the overall performance of electric vehicles, and the power battery pack is the energy source of electric vehicles. Commonly used power battery packs include ternary lithium batteries and lithium iron phosphate batteries. The charging and discharging capacity and safety of lithium batteries are closely related to temperature. At high temperatures, batteries are at risk of thermal runaway, which can lead to explosions, requiring cooling measures; at low temperatures, the battery's charging and discharging capacity will decrease significantly, requiring heating measures.

[0003] In existing technologies, battery temperature control often involves wrapping the battery in a rigid aluminum tube filled with water or antifreeze to control its temperature. However, this method can only control the temperature of the side of the battery cell. Not only is the heat conduction rate slow, but it also causes uneven heating of the battery, which poses a risk of explosion.

[0004] In addition, the heat conduction effect of the temperature control components in existing battery temperature control devices is not ideal, resulting in low heat conduction efficiency over a long period of time, which seriously affects the temperature control efficiency of the battery. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a multi-layer battery temperature control device and its installation method to solve the problems of uneven heating of existing batteries and poor temperature control effect and low temperature control efficiency of battery packs.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] A multi-layer battery temperature control device includes a battery pack and a temperature control component. The temperature control component is used to control the temperature of the battery pack. The battery pack is composed of multiple identical vertical battery rows arranged side by side, which are longitudinally parallel and aligned with each other. Pipe channels are provided between the vertical battery rows, and battery temperature control devices are provided between the pipe channels.

[0008] Furthermore, the battery temperature control device includes a double-layer combined flat tube, which is wound in an S-shape in two adjacent pipe channels, so that the outer wall of the double-layer combined flat tube contacts the outer wall of the longitudinal battery pack.

[0009] Furthermore, the longitudinal battery pack is composed of multiple identical transverse battery packs stacked side by side in a longitudinal direction; the transverse battery pack is composed of multiple identical battery cells.

[0010] Furthermore, a transverse retainer is provided between two adjacent sets of transverse battery packs in the same column of longitudinal battery packs, as well as at the top and bottom of the same column of longitudinal battery packs; the transverse retainer is elongated and contacts the bottom and top of each corresponding battery cell.

[0011] Furthermore, the double-layer combined flat tube includes a flat portion and a bent portion. The flat portion is parallel to the side of the longitudinal battery pack, and the longitudinal direction of the bent portion is parallel to the longitudinal side of the longitudinal battery pack.

[0012] Furthermore, the width of the transverse retainer is smaller than the width of the individual battery cells, and there are gaps between the transverse battery rows on both sides that contact the transverse retainer.

[0013] Furthermore, the double-layer composite flat tube includes an inner flat tube and an outer flat tube.

[0014] Furthermore, the outer flat tube is a flexible tube.

[0015] Furthermore, an electric heating wire is wound around the outer wall of the inner flat tube.

[0016] Furthermore, the inner flat tube is a multi-channel structure containing fins.

[0017] Furthermore, one end of the double-layer combined flat tube is provided with an antifreeze outlet and a phase change material outlet; the other end of the double-layer combined flat tube is provided with an antifreeze inlet and a phase change material inlet.

[0018] Furthermore, a method for installing a battery device includes the following steps:

[0019] Step S1: Arrange the individual battery cells into a battery pack;

[0020] Step S2: Install the retainer on the battery pack;

[0021] Step S3: Install the battery temperature control device.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] (1) The present invention provides transverse retainers and connecting frames between and around the battery packs. The cooperation between the two makes the entire battery pack structurally stable and maintain its stability after the transverse retainers and connecting frames are inserted.

[0024] (2) In addition to holding and fixing the battery cells together, the transverse retainer of the present invention also contains a coolant flow channel. The transverse retainer includes a silicone outer layer and an aluminum alloy inner layer, which are tightly bonded together. The high thermal conductivity silicone sheet of the outer layer is soft yet has good toughness, achieving effective bonding with the battery cells and reducing uneven heat transfer caused by unevenness on the upper and lower sides of the battery cells. This design can not only fix and stabilize the battery pack and the overall shape, but also facilitate heat exchange and transfer between the battery cells. It also has impact resistance to resist vibrations during normal vehicle use and, to a certain extent, resists strong impacts from electric vehicles, preventing explosions. The inner aluminum alloy layer is used for the flow of antifreeze, allowing the temperature of the inner coolant to be directly transferred to the battery cells through the outer silicone layer. This allows the battery cells to be cooled not only by the antifreeze in the combined flat tubes, but also by the connecting frame between the transverse retainers, enabling the entire battery to achieve a dual cooling effect instantly, significantly improving the battery cooling efficiency.

[0025] (3) The combined flat tube of the present invention has a double-layer structure. The inner layer is used to fill antifreeze. The antifreeze can achieve temperature change by cooling or heating by an external liquid cooler. The annular gap between the inner and outer layers is filled with phase change material. The temperature change of the antifreeze is conducted to the phase change material in the annular gap through the thermal conductivity of the inner rigid flat tube. The temperature regulation and temperature control of the battery are achieved through the phase change of the phase change material and temperature conduction.

[0026] (4) The outer layer of the double-layer composite flat tube in this invention is a soft flat tube made of a flexible thermally conductive material, preferably thermally conductive silicone. The most prominent feature of the outer soft flat tube is its flexibility and elasticity. When the phase change material undergoes a phase change in the annular gap and its volume changes, the outer soft flat tube will deform accordingly with the change in the volume of the phase change material in the annular gap.

[0027] (5) Due to the volume change during the phase change process of the phase change material, the deformation direction of the outer soft flat tube encapsulating the phase change material extends towards the space where the outer soft flat tube is not filled. That is, when the outer soft flat tube deforms, its deformation direction naturally extends into the gaps between the battery packs and between the battery cells. This ensures that the outer wall of the outer soft flat tube not only adheres to the sidewall of the battery cell but also to the top and bottom edges of the battery cell. This design achieves three-dimensional, six-sided heat transfer from the phase change material to the battery cell, comprehensively and multi-directionally transferring heat to the battery cell, resulting in more uniform heating and faster heat conduction rate.

[0028] (6) When the outer soft flat tube of the present invention deforms, its outer wall will simultaneously achieve extreme extension in both the lateral and longitudinal directions. After extending to a certain extent, it will contact the connecting frame around the battery pack and the lateral retainer, so that the outer soft flat tube is connected to all the retainers of the battery pack, realizing a closed loop network of interconnected grids of the entire battery pack. This enables comprehensive, multi-directional, and three-dimensional heat transfer to the entire battery pack, making the battery pack more uniformly heated and the heat conduction rate faster. Therefore, it reduces the power consumption of the battery pack, extends the single-use time of the battery pack, and avoids the situation where the battery pack explodes due to uneven heating.

[0029] (7) The outer layer of the double-layer composite flat tube of the present invention is a soft flat tube, and the inner layer is a hard flat tube. This double-layer composite flat tube maintains the strength of the entire composite flat tube through the inner hard flat tube, ensuring a certain degree of support between the battery packs. At the same time, the inner hard flat tube ensures the flexibility, elasticity, and compressive strength of the composite flat tube, which can resist impact forces to a certain extent. Therefore, this double-layer composite flat tube combining soft and hard materials achieves the dual functions of strength and flexibility, enabling the entire battery pack to maintain a certain strength while resisting impact forces, thus achieving a buffering and shock absorption effect for the entire battery pack.

[0030] (8) The outer wall of the inner flat tube of the present invention is wound with an electric heating wire. The electric heating wire can fully contact the phase change material filling the annular gap and heat the phase change material to achieve heating and temperature control of the battery cell. The electric heating wire is evenly wound on the outer side of the inner flat tube, and there is an equal gap between adjacent wound electric heating wires, so that the phase change material is heated evenly and the problem of local overheating is avoided.

[0031] (9) The inner flat tube of the present invention is a multi-channel structure containing fins. Multiple fins are arranged parallel to each other at equal intervals, ensuring equal spacing between them. Both sides are connected to the inner wall of the inner flat tube, forming multiple channels with equal cross-sections within the inner flat tube. This multi-channel structure significantly increases the surface area of ​​the entire inner flat tube, thereby multiplying the contact area between the inner flat tube and the antifreeze flowing inside. This greatly increases the specific surface area (the ratio of surface area to volume), improving the heat exchange area between the antifreeze and the inner flat tube, and thus enhancing the overall heat exchange efficiency of the device.

[0032] (10) The multi-channel structure of the inner flat tube of this invention divides its hydraulic diameter into multiple smaller hydraulic diameters through multiple fins, accelerating the heat transfer rate and resulting in a higher surface heat transfer coefficient. This improves heat exchange efficiency, enabling efficient cooling and heating of the battery. Simultaneously, the high surface heat transfer coefficient and small unit volume heat flux make it lightweight and highly portable, allowing for better application in space-constrained devices such as the annular gaps in battery packs. Furthermore, under the same heat exchange requirements, this multi-channel heat exchange structure has a smaller volume, significantly reducing material consumption and controlling material costs.

[0033] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0034] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0035] Figure 1 This is a schematic diagram of the multi-layer battery temperature control device of the present invention;

[0036] Figure 2 This is a schematic diagram of the battery pack in the multi-layer battery temperature control device of the present invention;

[0037] Figure 3 For the present invention Figure 2 Sectional view of section AA;

[0038] Figure 4 This is a longitudinal sectional view of the double-layer combined flat tube in the multi-layer battery temperature control device of the present invention before its morphological change.

[0039] Figure 5 This is a schematic diagram of the transverse retainer in the multilayer battery temperature control device of the present invention;

[0040] Figure 6 This is a cross-sectional view of the transverse retainer in the multilayer battery temperature control device of the present invention;

[0041] Figure 7 This is a longitudinal sectional view of the double-layer combined flat tube in the multi-layer battery temperature control device of the present invention after morphological changes.

[0042] Figure 8 For the present invention Figure 7 A magnified view of part A in the middle;

[0043] Figure 9This is a schematic diagram showing the relationship between the heating wire and the double-layer combined flat tube in the multi-layer battery temperature control device of the present invention.

[0044] Figure label:

[0045] 1: Battery pack; 1-1: Vertical battery pack; 1-2: Horizontal battery pack; 1-3: Individual battery cell; 1-4: Horizontal retainer; 1-4-1: Cold plate inlet; 1-4-2: Silicone outer layer; 1-4-3: Cold plate outlet; 1-4-4: Aluminum alloy inner layer; 1-5: Connecting frame; 1-6: Gap; 1-7: Antifreeze outlet; 1-8: Antifreeze inlet; 1-9: Phase change material outlet; 1-10: Phase change material inlet.

[0046] 2: Double-layer composite flat tube; 2-1: Inner flat tube; 2-2: Outer flat tube; 2-3: Annular gap; 2-4: Flow channel; 2-5: Electric heating wire;

[0047] 3: Insulated box; 4: Refrigeration unit; 5: Piping. Detailed Implementation

[0048] The following detailed description of a multi-layer battery temperature control device and its installation method, with reference to specific embodiments, is provided. These embodiments are for comparison and explanation purposes only, and the present invention is not limited to these embodiments.

[0049] A specific embodiment of the present invention provides a multi-layer battery temperature control device, such as... Figure 1 As shown, it includes a battery device, an insulated box 3, a refrigeration unit 4, and pipelines 5. The battery device is installed inside the insulated box 3. The refrigeration unit 4 is connected to the battery device through the pipelines 5 and controls the temperature of the battery device.

[0050] Furthermore, such as Figure 2 As shown, the battery device includes a battery pack 1 and a temperature control component. The temperature control component is used to control the temperature of the battery pack 1. The battery pack 1 is composed of multiple identical vertical battery rows 1-1 arranged side by side, which are longitudinally parallel and aligned with each other.

[0051] A pipe channel is provided between two adjacent longitudinal battery packs 1-1, and a temperature control component is provided between the pipe channels.

[0052] Furthermore, the temperature control component includes a double-layer combined flat tube 2, a temperature sensor, and an external temperature control device. The double-layer combined flat tube 2 is wound in an S-shape in two adjacent pipe channels, so that the outer wall of the double-layer combined flat tube 2 is in contact with the outer wall of the longitudinal battery pack 1-1, thereby allowing the temperature of the entire battery pack 1 to be regulated by the temperature change of the double-layer combined flat tube 2.

[0053] Preferably, the battery device is used in automobiles, electric bicycles, or other electric vehicles.

[0054] Furthermore, the temperature sensor is used to measure the temperature of the battery pack 1; the external temperature control device is used to heat or cool the double-layer combined flat tube 2.

[0055] Furthermore, the longitudinal battery pack 1-1 is composed of multiple identical transverse battery packs 1-2 stacked longitudinally side by side, with the multiple transverse battery packs 1-2 arranged horizontally parallel and aligned with each other. Each transverse battery pack 1-2 is composed of multiple identical battery cells 1-3, arranged side by side and aligned, meaning the outer wall of the double-layer combined flat tube 2 is in contact with the side walls of each battery cell 1-3. Furthermore, transverse retainers 1-4 are provided between adjacent sets of transverse battery packs 1-2 in the same column of longitudinal battery packs 1-1, and at the top and bottom of the same column of longitudinal battery packs 1-1. The transverse retainers 1-4 are elongated and contact the bottom and top of each battery cell 1-3.

[0056] Furthermore, such as Figure 3 As shown, the double-layer combined flat tube 2 includes a flat portion and a bent portion. The flat portion is parallel to the transverse side of the longitudinal battery pack 1-1. The bent portion is parallel to the width side of the longitudinal battery pack 1-1, and its longitudinal direction is parallel to the longitudinal side of the longitudinal battery pack 1-1. That is, the double-layer combined flat tube 2 is wrapped around the side of each battery cell 1-3, so that the double-layer combined flat tube 2 is in contact with the outer side wall of the battery cell 1-3.

[0057] Furthermore, such as Figure 4 As shown, the structure of the transverse retainer 1-4 also includes intermediate support plates and end collection plates. The intermediate support plates are arranged in parallel, and the end collection plates are located at both ends of the multiple intermediate support plates.

[0058] Furthermore, the width of the intermediate support plate of the transverse retainer 1-4 is smaller than the width of the battery cell 1-3. Therefore, after two adjacent transverse battery rows 1-2 come into contact with the intermediate support plate of the transverse retainer 1-4, gaps 1-6 are formed on both sides of the intermediate support plate and between the upper and lower battery cells 1-3.

[0059] Furthermore, the top and bottom of the battery pack 1 are provided with connecting brackets 1-5, and the connecting brackets 1-5 are provided with recesses that match the transverse retainer 1-4. The recesses can be connected with the transverse retainer 1-4, so that after the connecting brackets 1-5 and the transverse retainer 1-4 are inserted, the structure of the entire battery pack 1 can be stabilized and its stability can be maintained.

[0060] Furthermore, the transverse retainer 1-4 and the connecting frame 1-5 are preferably made of a high-thermal-conductivity and impact-resistant polymer material with a certain strength, so that they have a certain strength and excellent thermal conductivity, and can still maintain the stability of the entire battery pack 1 structure even if the electric vehicle is subjected to a strong impact.

[0061] It is worth noting that, such as Figures 5-6 As shown, the transverse retainer 1-4 includes a cold plate inlet 1-4-1, a silicone outer layer 1-4-2, a cold plate outlet 1-4-3, and an aluminum alloy inner layer 1-4-4. The silicone outer layer 1-4-2 is disposed on the outside of the aluminum alloy inner layer 1-4-4, and the two are tightly fitted together. The aluminum alloy inner layer 1-4-4 also contains a refrigerant flow channel for filling with refrigerant. The cold plate inlet 1-4-1 and the cold plate outlet 1-4-3 are respectively disposed on both sides of the aluminum alloy inner layer 1-4-4 for the inflow and outflow of refrigerant.

[0062] Specifically, the transverse retainer 1-4, in addition to holding and fixing the battery cells 1-3 together, also serves as a cooling plate for the flow of coolant to cool the battery. The outer silicone layer 1-4-2 is a high thermal conductivity silicone sheet, which is soft yet has good toughness, allowing for effective adhesion to the battery cells 1-3 and reducing uneven heat transfer caused by unevenness on the upper and lower sides of the battery cells 1-3. This design not only secures the battery pack and the overall shape but also facilitates heat exchange and transfer between the battery cells 1-3. Furthermore, it has impact resistance to withstand vibrations during normal vehicle use and, to some extent, resists strong impacts from electric vehicles, preventing explosions. The aluminum alloy inner layer 1-4-4 is used for the flow of antifreeze, so that the temperature of the inner coolant can be directly transferred to the battery cell 1-3 through the outer silicone layer. In addition to being cooled by the antifreeze in the double-layer combined flat tube 2, the battery cell 1-3 can also be further cooled by the transverse retainer 1-4 between the battery cells, so that the entire battery can achieve a dual cooling effect instantly, which greatly improves the battery cooling efficiency.

[0063] Example 1

[0064] Furthermore, such as Figures 7-8 As shown, the double-layer composite flat tube 2 has a double-layer structure, including an inner flat tube 2-1, an outer flat tube 2-2, and an electric heating wire 2-5. An annular gap 2-3 is provided between the inner flat tube 2-1 and the outer flat tube 2-2. The annular gap 2-3 is used to fill phase change material, that is, the space between the inner flat tube 2-1 and the outer flat tube 2-2 is the storage space for phase change material.

[0065] Furthermore, such as Figure 9As shown, the electric heating wire 2-5 is evenly spirally wound around the outside of the inner flat tube 2-1 for heating the phase change material. Both the inner flat tube 2-1 and the outer flat tube 2-2 are made of materials with good thermal conductivity.

[0066] Specifically, the heating wire 2-5 can fully contact the phase change material filling the annular gaps and heat the phase change material to achieve heating and temperature control of the battery cell 1-3. The heating wire 2-5 is evenly wound on the outside of the inner flat tube 2-1, and there is an equal gap between adjacent wound heating wires 2-5, so that the phase change material is heated evenly and the problem of local overheating is avoided.

[0067] Specifically, the phase change material can undergo a solid-liquid transition at its melting point; that is, the transition from solid to liquid is an endothermic process, and the transition from liquid to solid is an exothermic process. Furthermore, the volume of the phase change material will change during the solid-liquid phase transition.

[0068] Specifically, the inner flat tube 2-1 is an inner rigid flat tube with a flow channel 2-4 inside for holding antifreeze. The antifreeze can achieve temperature change by cooling or heating through an external temperature control device. The temperature change is then transferred to the phase change material in the annular gap 2-3 through the thermal conductivity of the inner rigid flat tube. The phase change and temperature conduction of the phase change material then achieve the temperature regulation and control of the battery.

[0069] Specifically, the antifreeze can be heated by an external temperature control device to raise its temperature; simultaneously, the antifreeze can also be cooled by the same external temperature control device to lower its temperature. Preferably, the external temperature control device is a temperature controller.

[0070] It is worth noting that the inner flat tube 2-1 is a multi-channel structure containing fins. Multiple fins in the inner flat tube 2-1 are arranged parallel to each other at equal intervals, so that the spacing between them is equal. Both sides are connected to the inner wall of the inner flat tube 2-1, so that multiple channels with equal cross-sections are formed in the inner flat tube 2-1.

[0071] Furthermore, the arrangement of multiple fins inside the inner flat tube 2-1 increases the surface area of ​​the entire inner flat tube 2-1 by a factor of two, thereby increasing the contact area between the inner flat tube 2-1 and the antifreeze flowing inside by a factor of two, significantly increasing the specific surface area (the ratio of surface area to volume), improving the heat exchange area between the antifreeze inside the inner flat tube 2-1 and the inner flat tube 2-1, and thus improving the heat exchange efficiency of the entire device.

[0072] Specifically, the inner flat tube 2-1 uses multiple fins to divide its hydraulic diameter into several smaller hydraulic diameters, accelerating the heat transfer rate and resulting in a higher surface heat transfer coefficient. This improves heat exchange efficiency, enabling efficient cooling and heating of the battery. Simultaneously, the high surface heat transfer coefficient and small heat flux per unit volume make it lightweight and highly portable, allowing for better application in space-constrained devices such as the annular gap 2-3 of the battery pack 1. Furthermore, under the same heat exchange requirements, this multi-channel heat exchange structure has a smaller volume, significantly reducing material consumption and controlling material costs.

[0073] Furthermore, the outer flat tube 2-2 is a soft outer flat tube made of a flexible thermally conductive material, preferably thermally conductive silicone. The most significant characteristic of the outer soft flat tube is its flexibility and elasticity. When the phase change material undergoes a phase change and its volume changes within the annular gap 2-3, the outer soft flat tube will deform accordingly with the volume change of the phase change material within the annular gap 2-3.

[0074] Specifically, when the phase change material in the annular gap 2-3 undergoes a solid-liquid phase change, the outer soft flat tube will deform, and the direction of its deformation will extend towards the space where the double-layer combined flat tube 2 is not filled. Since the outer wall of the outer soft flat tube is tightly attached to the side walls on both sides of each battery cell 1-3, and there is no gap between the two walls, when the outer soft flat tube deforms, its deformation direction will naturally extend towards the gap 1-6 between the transverse battery rows 1-2, or in other words, towards the gap 1-6 between the battery cells 1-3, so that the outer wall of the outer soft flat tube is attached to the top and bottom edges of the battery cells 1-3. In other words, the outer wall of the outer soft flat tube can wrap the side wall of the battery cell 1-3 as well as the top and bottom of the battery cell 1-3, thereby realizing the three-dimensional heat transfer of the phase change material to the battery cell 1-3 on all six sides, and realizing the comprehensive and multi-directional energy transfer of the battery cell 1-3, making the battery energy transfer more uniform and faster.

[0075] Furthermore, when the outer wall of the outer soft flat tube extends to a certain extent, it will come into contact with the transverse retainer 1-4, that is, the outer soft flat tube and the transverse retainer 1-4 form a closed loop for energy transfer around each battery cell 1-3.

[0076] Furthermore, the outer wall of the outer soft flat tube extends longitudinally. After extending to a certain extent, it contacts the transverse retainer 1-4 and the connecting frame 1-5 at the top and bottom of the longitudinal battery pack 1-1, realizing a closed loop between the entire longitudinal battery pack 1-1. Finally, the closed loop, through the connecting frame 1-5, realizes a grid-like interconnected closed loop network of the entire battery pack 1. The closed loop network achieves comprehensive, multi-directional, three-dimensional heat transfer for the entire battery pack 1, making the energy transfer of the battery pack 1 more uniform and the energy conduction rate faster. Therefore, it increases the stability of the battery pack 1, reduces the impact of temperature on the energy consumption of the battery pack 1, extends the service life of the battery pack 1 on a single charge, increases the driving range of the electric vehicle on a single charge, and avoids the electric vehicle's battery from exploding due to uneven heating or rapidly losing power in cold winter conditions.

[0077] Specifically, the combination of the outer soft flat tube and the inner hard flat tube enables the double-layer combined flat tube 2 to maintain the strength of the entire double-layer combined flat tube 2 through the inner hard flat tube, so that it can ensure a certain degree of support between the longitudinal battery packs 1-1. At the same time, the inner hard flat tube ensures the flexibility, elasticity and compressive strength of the double-layer combined flat tube 2, which can resist impact to a certain extent. Therefore, the double-layer combined flat tube 2, which combines softness and hardness, realizes the dual functions of strength and flexibility, so that the entire battery pack 1 can maintain its strength and resist impact, thus achieving the buffering and shock absorption effect of the entire battery pack 1.

[0078] Furthermore, one end of the double-layer combined flat tube 2 is provided with an antifreeze outlet 1-7, which is connected to the inner flat tube 2-1. At the same end, a phase change material outlet 1-9 is also provided, which is connected to the annular gap 2-3. The other end of the double-layer combined flat tube 2 is provided with an antifreeze inlet 1-8, which is connected to the inner flat tube 2-1. At the same end, a phase change material inlet 1-10 is also provided, which is connected to the annular gap 2-3.

[0079] Furthermore, the inlet and outlet of the pipe 5 of the refrigeration unit 4 are connected to the antifreeze inlet 1-8 and the cold plate inlet 1-4-1, as well as the antifreeze outlet 1-7 and the cold plate outlet 1-4-3 of the battery pack 1, respectively, for the circulation of antifreeze and to realize the dual cooling function of the combined flat pipe and cold plate for the battery pack 1.

[0080] Example 2

[0081] Optionally, the double-layer combined flat tube 2 has a double-layer structure, including an inner flat tube 2-1 and an outer flat tube 2-2, both of which are made of flexible thermally conductive material. The flexibility of the double-layer combined flat tube 2 allows for bending in any direction and shape within the tube channel during installation, making installation convenient and quick, easy to operate and process. It also improves the fit between the double-layer combined flat tube 2 and the battery cells 1-3 and the longitudinal battery array 1-1, resulting in better heat conduction of the entire device. Since the double-layer combined flat tube 2 is made of flexible thermally conductive material, it provides better impact and pressure resistance for the entire battery pack 1, achieving a buffering and shock absorption effect.

[0082] The present invention also discloses an installation method for a multi-layer battery temperature control device, which is used to install the multi-layer battery temperature control device of Embodiment 1 or Embodiment 2 above, and includes the following steps:

[0083] Step S1: Arrange battery cells 1-3 in an array to form battery pack 1:

[0084] Battery cells 1-3 are arranged side by side to form a horizontal battery row 1-2. Multiple horizontal battery rows 1-2 are stacked to form a vertical battery row 1-1. The vertical battery rows 1-1 are then arranged side by side to form a battery pack 1, and a pipe channel is left between adjacent columns of vertical battery rows 1-1.

[0085] Step S2: Install the retainer for battery pack 1:

[0086] Place a transverse retainer 1-4 at the top and bottom of each transverse battery pack 1-2, then place a connecting bracket 1-5 at the bottom of the insulation box, and then place the assembled battery pack 1 inside the insulation box. This allows the connecting bracket 1-5 and the transverse retainer 1-4 to interlock and stabilize the entire battery pack 1.

[0087] The width of the transverse retainer 1-4 is smaller than the width of the battery cell 1-3. Therefore, after the transverse retainer 1-4 is installed between the transverse battery packs 1-2, a gap 1-6 is formed on both sides of the transverse retainer 1-4 between the transverse battery packs 1-2.

[0088] Step S3: Install the temperature control component:

[0089] The unfilled double-layer combined flat tube 2 is wound in an S-shape into the pipe channel, with the flat portion of the double-layer combined flat tube 2 parallel to the side of the longitudinal battery pack 1-1. Then, the bent portion of the double-layer combined flat tube 2 is wrapped around the width side of the longitudinal battery pack 1-1, making the longitudinal direction of the bent portion parallel to the longitudinal side of the longitudinal battery pack 1-1. Then, the flat portion of the double-layer combined flat tube 2 is made parallel to the side of the longitudinal battery pack 1-1. This process is repeated until the double-layer combined flat tube 2 fills the pipe channel, making the outer wall of the double-layer combined flat tube 2 fit against the outer wall of the longitudinal battery pack 1-1. The outlet of the refrigeration unit 4 is connected to the antifreeze outlet 1-7 and the cold plate outlet 1-4-3; the inlet of the refrigeration unit 4 is connected to the antifreeze inlet 1-8 and the cold plate inlet 1-4-1.

[0090] Place another connecting bracket 1-5 on the top of the battery pack 1 with the double-layer combined flat tube 2 wound around it, and connect it with the transverse retainer 1-4 on the top of the battery pack 1. Then place the battery pack 1 in the heat preservation box 3.

[0091] Step S4: Deform the double-layer composite flat tube 2

[0092] Double-layer composite flat tube 2 Deformation form 1:

[0093] When battery pack 1 is started, the temperature of battery pack 1 rises and dissipates heat. At this time, the phase change material in the annular void 2-3 changes from a solid-liquid mixed state to a liquid state. The overall volume of the phase change material in the annular void 2-3 increases, causing the outer flat tube 2-2 to deform.

[0094] The deformation of the outer wall of the outer flat tube 2-2 extends towards the unfilled space of the double-layer combined flat tube 2. Specifically, the outer flat tube 2-2 expands and extends into the gaps 1-6 and towards the top and bottom edges of the battery cells 1-3. This allows the double-layer combined flat tube 2 to contact the sidewalls, top, and bottom of the battery cells 1-3, achieving three-dimensional heat transfer on six sides. This comprehensive and multi-directional heat transfer to the battery cells 1-3 results in more uniform battery energy distribution and faster energy conduction. Furthermore, the outer flat tube 2-2 deforms after the double-layer combined flat tube 2 is installed in the battery pack 1. This method makes the installation of the double-layer combined flat tube convenient and quick, saving manpower and costs.

[0095] Since the outer flat tube 2-2 is made of a flexible thermally conductive material, it has a certain degree of flexibility. Therefore, when the double-layer combined flat tube 2 is deformed, even if the phase change material is cooled and changes from liquid to solid, and the volume becomes smaller, the outer wall of the outer flat tube 2-2 will shrink to a certain extent. However, a part of it will still remain in the gap 1-6 to achieve heat conduction to the sides of the battery cell 1-3 as well as part of the top and bottom.

[0096] Double-layer composite flat tube 2 Deformation form two:

[0097] Liquid phase change material is injected into the annular gap 2-3 under high pressure through the phase change material inlet hole 3-2-10, filling the space between the inner flat tube 2-1 and the outer flat tube 2-2 with phase change material. Due to the high-pressure filling and the fact that the outer flat tube 2-2 is made of flexible thermally conductive material, the liquid phase change material causes the deformation of the outer wall of the outer flat tube 2-2 to extend towards the unfilled space of the double-layer combined flat tube 2 during the high-pressure filling process. That is, the outer flat tube 2-2 expands and extends into the gap 1-6 and towards the top and bottom edges of the battery cell 1-3, achieving contact between the double-layer combined flat tube 2 and the sidewalls, top, and bottom of the battery cell 1-3. This enables three-dimensional heat transfer on six sides, achieving comprehensive and multi-directional heat transfer to the battery cell 1-3, resulting in more uniform battery energy and a faster energy conduction rate. In addition, the outer flat tube 2-2 deforms after the double-layer combined flat tube 2 is installed in the battery pack 1. This method makes the installation of the double-layer combined flat tube convenient and quick, saving manpower and costs.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-layer battery temperature control device, characterized in that, The device includes a battery assembly, an insulated box (3), a refrigeration unit (4), and pipelines (5). The battery assembly is located inside the insulated box (3). The refrigeration unit (4) is connected to the battery assembly via pipelines (5) and controls the temperature of the battery assembly. The battery assembly includes a battery pack (1) and a temperature control component. The temperature control component is used to control the temperature of the battery pack (1). The battery pack (1) includes a transverse retainer (1-4) which is used to fix the batteries in the battery pack (1) and to cool and control the temperature. The transverse retainer (1-4) includes a cold plate inlet (1-4-1), a silicone outer layer (1-4-2), a cold plate outlet (1-4-3), and an aluminum alloy inner layer (1-4-4). The battery pack (1) also includes a longitudinal battery row (1-1), and multiple longitudinal battery rows (1-1) are arranged longitudinally parallel and aligned with each other; and a pipe channel is provided between multiple longitudinal battery rows (1-1), and a temperature control component is provided in the pipe channel; the temperature control component includes a double-layer combined flat tube (2), and the double-layer combined flat tube (2) is arranged in two adjacent pipe channels; the double-layer combined flat tube (2) includes an inner flat tube (2-1) and an outer flat tube (2-2); the combined flat tube has a double-layer structure, the inner layer is used to fill antifreeze; the annular gap between the inner layer and the outer layer is filled with phase change material; the outer layer of the double-layer combined flat tube is a soft flat tube, which is made of flexible thermally conductive material.

2. The multi-layer battery temperature control device according to claim 1, characterized in that, The transverse retainer (1-4) also includes an intermediate support plate and end collection plates.

3. The multi-layer battery temperature control device according to claim 2, characterized in that, The longitudinal battery pack (1-1) includes a transverse battery pack (1-2), and multiple transverse battery packs (1-2) are stacked vertically; the transverse battery pack (1-2) includes a battery cell (1-3), and multiple battery cells (1-3) are arranged in parallel.

4. The multi-layer battery temperature control device according to claim 3, characterized in that, The lateral retainer (1-4) is disposed between adjacent lateral battery packs (1-2) and at the top and bottom of the lateral battery packs (1-2); the lateral retainer (1-4) is in contact with the bottom and top of each battery cell (1-3).

5. The multi-layer battery temperature control device according to claim 4, characterized in that, The width of the intermediate support plate is smaller than the width of the battery cell (1-3), and there is a gap (1-6) between the upper and lower battery cells (1-3) on both sides of the two adjacent transverse retainers (1-4).

6. The multi-layer battery temperature control device according to claim 5, characterized in that, The double-layer combined flat tube (2) includes a flat part and a bent part. The flat part is parallel to the side of the longitudinal battery pack (1-1), and the longitudinal direction of the bent part is parallel to the longitudinal side of the longitudinal battery pack (1-1).

7. A method for installing a multi-layer battery temperature control device, using the multi-layer battery temperature control device according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Arrange the battery cells (1-3) into an array to form a battery pack (1); Step S2: Install the retainer for the battery pack (1); Step S3: Install the temperature control component; Step S4: Deform the double-layer composite flat tube (2).

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