Battery cell constant-temperature standing device

Abstract

The invention provides a battery cell constant-temperature standing device which comprises a standing frame, the standing frame comprises a plurality of standing units, a plurality of battery cells are arranged in the standing units in a queue mode, a heating module is arranged between every two adjacent battery cells of each standing unit, and the heating modules are connected with the standing units. The heating module can be attached to the battery cells located on the two sides of the heating module during standing and continuously heat the battery cells. The heating module of the constant-temperature standing device for the battery cell can be inserted into the gap of the battery cell in a penetrating manner and is fully attached to the two large surfaces of the battery cell during standing, a liquid temperature control mode is adopted, high consistency of temperature distribution is guaranteed by means of circulating flow of heated heat conduction liquid, temperature regulation and control of each standing frame are achieved, energy consumption can be remarkably reduced, and the energy consumption is reduced. And the temperature regulation and control precision is also improved.

Description

Technical Field

[0001] The invention relates to the lithium ion battery manufacturing industry, and in particular to a battery cell constant temperature static device. Background Art

[0002] There are usually many static processes in the manufacturing process of lithium-ion batteries, including high-temperature infiltration process, high-temperature aging process, normal temperature static process, etc. The battery cell needs to be placed in an air-conditioned room for a certain period of time, such as 24h, 48h, 120h, etc. During this period, the temperature of the environment in which the battery cell is located needs to meet the set conditions, such as 45±3℃, 25±3℃, etc. With the rapid increase in the current single-line production capacity of battery cells, the requirements for the number and space of static racks in static rooms are getting higher and higher. Traditional static rooms usually use high-power air conditioners to implement hot and cold air exchange to adjust the temperature in large rooms. The temperature regulation control accuracy of this solution is low, and there are problems such as uneven temperature distribution in space and excessive temperature fluctuations in time. Moreover, this solution belongs to rough temperature control, with low energy efficiency, which is not conducive to energy saving and consumption reduction of enterprises. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a constant temperature static device for battery cells, which solves the temperature control problem of the static process in the manufacturing process of lithium-ion battery cells, realizes a constant temperature state when the battery cells are static in a fixed position, and realizes smaller temperature fluctuations and higher temperature accuracy over a long period of time.

[0004] The battery cell constant temperature static device of the present invention comprises a static rack, wherein the static rack comprises a plurality of static units, wherein a plurality of battery cells are arranged in a queue in the static units, wherein a heating module is arranged between adjacent battery cells of each static unit, and the heating module can adhere to the battery cells located on both sides of the heating module when static and continuously heat the battery cells.

[0005] In one embodiment, the heating module includes multiple double-layer heating liquid bags, and the heating liquid bags are provided with a thermal liquid external port and an external wiring port. The thermal liquid external port is used to introduce / discharge thermal liquid into / from the heating liquid bag. A heating component is provided in the inner layer of the heating liquid bag, and the heating component is connected to an external power supply through the external wiring port to heat the thermal liquid in the heating liquid bag.

[0006] In one embodiment, the battery cell constant temperature static device also includes a thermal liquid transmission module, which is connected to the thermal liquid external port of the heating liquid bag through a thermal liquid pipeline to control the circulation flow of the thermal liquid in the heating module and control the expansion and contraction of the heating module.

[0007] In one embodiment, the battery cell constant temperature static device further comprises a lifting device, and the heating module is inserted into the gap between adjacent battery cells from above the battery cells through the lifting device, and is separated from the battery cells from above the battery cells through the lifting device.

[0008] In one embodiment, the stationary unit includes a battery cell stationary tray, each battery cell stationary tray is a box-shaped body with an open top, the periphery and the bottom of the box are sealed, and the battery cells are arranged in a queue in the battery cell stationary tray.

[0009] In one embodiment, the heating device further comprises a fixing frame, the heating liquid bag is fixed on the fixing frame, the heating liquid bag corresponds to the gap between adjacent battery cells one by one, and the fixing frame is lifted and lowered by the lifting device.

[0010] In one embodiment, the heating module further comprises a temperature control unit, which is connected to the heating component in the heating liquid bag to control the temperature of the thermal conductive liquid in the heating liquid bag.

[0011] In one embodiment, the number of the battery cell resting trays corresponds to the number of the heating modules.

[0012] In one embodiment, the heat transfer fluid is a mixture of mineral oil, synthetic oil and organic matter.

[0013] In one embodiment, the battery cell static tray includes a tray outer frame, the circumferential surface and the bottom surface of the tray outer frame are sealed, one or more tray inner frames are arranged in the tray outer frame, each of the tray inner frames includes a plurality of spaced-apart limit platforms for placing the battery cells, the heating module is arranged between adjacent limit platforms, the width L1 of the limit platforms is greater than the width L2 of the battery cells, and the length of the limit platforms is greater than the length of the heating module.

[0014] In one embodiment, the heating component is a mesh resistance heating wire or a rod-shaped or U-shaped tubular heating block.

[0015] In one embodiment, a plurality of the stationary units are stacked on the stationary rack, the thermal liquid transmission module is located on the top layer of the stationary rack, and is connected to the thermal liquid external port of the heating liquid bag of each layer of the stationary unit through a thermal liquid pipeline.

[0016] In one embodiment, the thermal fluid transmission module includes a thermal fluid tank, a hydraulic pump, a flow valve, a pressure sensor and a thermal fluid pipeline. The pressure sensor and the flow valve correspond to the static tray. The pressure signal is input to the flow valve through the pressure sensor to form a pressure control closed loop, thereby realizing independent control of the thermal fluid branch pipe pressure of each tray.

[0017] In one embodiment, each heat transfer liquid pipeline connected to the heating liquid bag is gathered into a heat transfer liquid main pipeline and connected to the hydraulic pump. A heat insulation material is arranged outside the heat transfer liquid main pipeline to reduce heat dissipation.

[0018] Compared with the prior art, the heating module of the battery cell constant temperature standing device of the present invention can be inserted into the gap between the battery cells and fully fit the two larger surfaces of the battery cells when standing. It adopts a liquid temperature control method and utilizes the circulation of the heated heat-conducting liquid to ensure high consistency of temperature distribution, thereby achieving temperature control for each standing rack, which not only significantly reduces energy consumption but also improves the accuracy of temperature control.

[0019] The above-mentioned technical features can be combined in various technically feasible ways to produce new embodiments, as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention will be described in more detail below based on non-limiting examples and with reference to the accompanying drawings, in which:

[0021] Figure 1A and Figure 1B The overall layout schematic diagram of the battery cell constant temperature static device according to the present invention is shown;

[0022] Figure 2 A schematic diagram of a stationary tray of the battery cell constant temperature stationary device in FIG1 is shown;

[0023] Figure 3 A schematic diagram showing the structure of the heating liquid bag of the battery cell constant temperature static device in FIG1 is shown;

[0024] Figure 4A and Figure 4B A schematic diagram showing the structure of a heating module of the battery cell constant temperature static device in FIG1 is shown;

[0025] Figure 5 A schematic diagram showing the structure of the lifting device of the battery cell constant temperature static device in FIG1 is shown;

[0026] Figure 6 The thermal fluid hydraulic control module of the battery cell constant temperature stationary device in FIG1 is shown;

[0027] Figure 7 A schematic diagram showing a stationary tray and a heating module before heating is shown;

[0028] Figure 8 A schematic diagram of a stationary tray and a heating module during heating is shown;

[0029] Fig. 9 The schematic diagram of the temperature closed-loop control structure of the heating module is shown;

[0030] Fig.10 Shows the connection logic diagram of each module in the device.

[0031] In the figures, the same components are indicated by the same reference numerals. The figures are not drawn to scale.

[0032] Wherein, the accompanying drawings are marked as follows:

[0033] 1. Thermal fluid transmission module; 11. Thermal fluid tank; 12. Hydraulic pump; 13. Flow valve; 14. Pressure sensor; 15. Thermal fluid branch pipeline; 16. Thermal fluid main pipeline; 2. Heating module; 21. Heating liquid bag; 211. Outer layer; 212. Inner layer; 213. External connection port; 214. Thermal fluid external connection port; 215. Heating component; 216. Welding area; 22. Fixing frame; 23. Temperature control unit; 24. Temperature sensor; 3. Stationary frame; 31. Stationary tray; 311. Tray outer frame; 312. Tray inner frame; 313. Limiting table; 4. Battery cell; 5. Lifting device. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0035] Parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0036] like Figure 1A and Figure 1B As shown, the battery cell constant temperature static device of the present invention includes a static rack 3, the static rack 3 includes a plurality of static units, and a plurality of battery cells 4 are arranged in a queue in the static units, wherein a heating module 2 is provided between adjacent battery cells 4 of each static unit, and the heating module 2 can fit the battery cells 4 located on both sides of the heating module 2 when static and continuously heat the battery cells 4, and can continuously heat and keep the temperature constant during the static process.

[0037] The heating module 2 of the battery cell constant temperature stationary device of this embodiment can be inserted into the gap between the battery cells, fully fit the two larger surfaces of the battery cells when stationary and continuously heat to keep the temperature constant, thereby achieving a constant temperature state when the battery cells are stationary in a fixed position, and achieving smaller temperature fluctuations and higher temperature accuracy over a long period of time.

[0038] In an optional embodiment, if Figure 3As shown, the heating module 2 includes a plurality of double-layered heating liquid bags 21, on which a thermal liquid external connection port 214 and an external wiring port 213 are provided. The thermal liquid external connection port 214 is used to introduce / discharge thermal liquid into / from the heating liquid bag 21, and a heating component 215 is provided in the inner layer of the heating liquid bag 21. The heating component 215 is connected to an external power source via the external wiring port 213 to heat the thermal liquid in the heating liquid bag 21.

[0039] In this embodiment, the heating cell adopts a liquid temperature control method, which utilizes the circulation of the heated heat-conducting liquid to ensure high consistency of temperature distribution. After the cell enters the static rack, the heating liquid bag 21 is inserted into the gap between adjacent cells and the heat-conducting liquid is introduced, so that the heating liquid bag 21 expands rapidly until it is fully fitted with the cell 4 on both sides. During the static process, the heating component in the heating liquid bag 21 continuously heats the heat-conducting liquid to keep the temperature constant.

[0040] In this embodiment, the inner layer of the heating liquid bag 21 can be a sealed plastic bag made of rubber, PET or other materials to hold the heat-conducting liquid. The outer layer is made of wear-resistant materials such as PET, rubber, aluminum-plastic film, etc., which is used for physical isolation protection and heat conduction, and is sealed by ultrasonic welding.

[0041] In other optional embodiments, the inner layer can also be made of high-strength polymer materials such as PP, PE, PVC, PS, and PC, and the outer layer can be made of materials such as rubber, PVC, and plastic fiber. The outer nested structure can be sealed by other methods such as hot stamping and plastic sealing. As long as the following conditions are met: the inner layer is sealed and heated, the outer layer is physically isolated and heat-transferring, and the inner and outer layers have a certain elasticity to meet the needs of swelling and contraction, the specific materials and specific sealing methods of the outer and inner layers can be selected according to actual conditions.

[0042] In an optional embodiment, the battery cell constant temperature static device also includes a thermal liquid transmission module 1, which is connected to the thermal liquid external port 214 of the heating liquid bag 21 through a thermal liquid pipeline to control the circulation flow of the thermal liquid in the heating module and control the expansion and contraction of the heating liquid bag 21.

[0043] In an optional embodiment, if Figure 5 As shown, the battery cell constant temperature static device of the present invention further includes a lifting device 5 , through which the heating module 2 is inserted from above the battery cell 4 into the gap between adjacent battery cells 4 , and is separated from the battery cell from above the battery cell through the lifting device 5 .

[0044] Alternatively, if Figure 5As shown, the lifting device 5 can be a guide cylinder or a screw rod, which is respectively connected to the heating module 2 and the static frame 3. The heating module is driven to move up and down through the up and down movement of the telescopic rod or the screw rod of the guide cylinder to insert into the gap between adjacent battery cells 4 or detach from the battery cells 4.

[0045] In an optional embodiment, the stationary unit includes a battery cell stationary tray 31. Each battery cell stationary tray 31 is a box-shaped body with an open top, the periphery and bottom of the box are sealed, and the battery cells 4 are arranged in a row in the battery cell stationary tray. By sealing the periphery and bottom of the stationary tray 31, it is more conducive to the heat preservation of the box.

[0046] In an optional embodiment, the heating module 2 further includes a fixing frame 22 , the heating liquid bag 21 is fixed on the fixing frame 22 , the heating liquid bag 21 corresponds to the gap between adjacent battery cells 4 one by one, and the fixing frame 22 is lifted and lowered by a lifting device.

[0047] Optionally, one end of the guide cylinder or screw rod serving as the lifting device 5 is fixed on the stationary frame 3, and the other end is fixedly connected to the fixed frame 22. The guide cylinder or screw rod drives the fixed frame 22 up and down, thereby driving the heating module 2 up and down.

[0048] In an optional embodiment, the heating module 2 further includes a temperature control unit 23, which is connected to the heating component in the heating liquid bag 21 to control the temperature of the heat transfer liquid in the heating liquid bag 21. Specifically, the temperature control unit 23 is connected in parallel with the heating network in each heating liquid bag 21, transmits a control signal to each liquid bag, and controls the heating action of each liquid bag. Among them, a temperature sensor 24 is provided in each heating liquid bag 21. When the temperature control unit 23 monitors that the temperature of the heat transfer liquid in the liquid bag reaches a predetermined temperature, the heating is stopped, and the heat preservation action is implemented within the temperature setting range to ensure that the temperature fluctuation of the battery cell 4 when it is stationary is within ±1°C.

[0049] like Fig. 9 As shown, the temperature sensor in the liquid bag transmits a signal to the temperature control unit 23 (single chip microcomputer), and the temperature control unit 23 issues instructions to control the power of the heating network in each heating liquid bag 21, thereby realizing a closed loop of automatic temperature control.

[0050] In one embodiment, the number of the cell resting trays 31 corresponds to the number of the heating modules 2. That is, each cell resting tray 31 corresponds to a heating module 2, and each heating module 2 includes a plurality of heating liquid bags 21, which are inserted into the gaps between adjacent cells 4 from above the cell resting trays 31, and adhere to the surface of the cell 4 to heat the cell 4.

[0051] In an optional embodiment, the heat transfer liquid in the heating liquid bag 21 is a mixture of mineral oil, synthetic oil and organic matter, which can meet the performance of good fluidity at low temperatures and low expansion rate at high temperatures, while being non-flammable, highly safe and meeting environmental protection requirements.

[0052] In an optional embodiment, if Figure 2 As shown, the battery cell resting tray 31 includes a tray outer frame 311, and the circumferential surface and bottom surface of the tray outer frame 311 are sealed to facilitate the heat preservation of the box. One or more tray inner frames 312 are arranged in the tray outer frame 311, and each tray inner frame 312 is divided into a plurality of spaced limiting platforms 313 for placing the battery cells 4. The heating module 2 (heating liquid bag 21) is arranged between adjacent limiting platforms 313, and the gap between the battery cells 4 is filled with heating liquid after swelling, so that the heating liquid bag 21 is fully fitted with the large surface of the battery cells 4.

[0053] The width L1 of the limiting platform 313 is slightly larger than the width L2 of the battery cell, so as to facilitate the entry and exit of the battery cell 4 . The length of the limiting platform 313 may be slightly larger than the length of the heating module 2 .

[0054] like Figure 2 As shown, in this embodiment, a battery cell resting tray 31 includes two tray inner frames 312 arranged in the tray outer shell 311, and each tray inner frame 312 is divided into 12 limit platforms 313 for placing battery cells 4. Therefore, a battery cell resting tray 31 can rest 24 battery cells.

[0055] like Figure 4A and 4B As shown, the heating module 2 is provided with a heating liquid bag 21 corresponding to the gap between adjacent battery cells of the above-mentioned battery cell resting tray 31. The heating liquid bags corresponding to the two tray inner frames 312 are fixed on the fixing frame to form an integrated structure, and at the same time fall from above the battery cell resting tray 31 and are inserted into the gap between adjacent battery cells 4, thereby achieving individual temperature control of a single battery cell resting tray 31 and ensuring the stability of temperature control.

[0056] In an optional embodiment, the heating component 215 is a mesh-shaped resistance heating wire or a rod-shaped or U-shaped tubular heating block, preferably a mesh-shaped resistance heating wire to ensure heating uniformity.

[0057] In an optional embodiment, multiple stationary units are stacked on the stationary rack 3, the thermal liquid transmission module is located on the top layer of the stationary rack 3, and is connected to the thermal liquid external port 214 of the heating liquid bag 21 of each layer of the stationary unit through a thermal liquid pipeline.

[0058] like Figure 1A and 1BAs shown, this embodiment takes a 4*4 stationary rack 3 as an example, each stationary rack 3 includes 16 stationary units, and each stationary unit includes a battery cell stationary tray 31 and a heating module 2. Each heating module 2 is inserted into the gap between adjacent batteries 4 from above the corresponding battery cell stationary tray 31. The heating module 2 is sandwiched between the bottom of the lower battery cell stationary tray 31 and the upper battery cell stationary tray 31. Each stationary rack 3 is provided with a thermal liquid transmission module, which is arranged at the top layer of the stationary rack 3 and is connected to the thermal liquid external port 214 of the heating liquid bag 21 of each layer of the stationary unit through a thermal liquid pipeline.

[0059] In other specific embodiments, the specifications of the stationary rack and the number of battery cells that can be placed on each stationary tray can be designed and selected according to actual conditions.

[0060] In an optional embodiment, if Figure 6 As shown, the thermal fluid transmission module includes a thermal fluid tank 11, a hydraulic pump 12, a flow valve 13, a pressure sensor 14 and a thermal fluid pipeline. The pressure sensor 14 and the flow valve 13 correspond to the battery cell static tray 31 respectively. The pressure signal is input to the flow valve 13 through the pressure sensor 14 to form a pressure control closed loop, thereby realizing independent control of the thermal fluid branch pipe pressure of each tray.

[0061] Furthermore, the thermal liquid box has a built-in heating device, which can adjust the temperature of the thermal liquid in the thermal liquid box in real time. More specifically, the thermal liquid box is provided with a heating network and a temperature sensor or a temperature sensor, which can independently realize the temperature control of the thermal liquid in the thermal liquid box.

[0062] In this way, by independently controlling the temperature of the thermal fluid in the thermal fluid box and realizing the basic temperature control function, the heating time of the battery cell can be significantly shortened. For example, the design heating temperature of the battery cell is 45°C, the heating temperature of the thermal fluid in the liquid bag is controlled at 45±1°C, and the temperature in the thermal fluid box is controlled at 35±1°C. The heating time of the battery cell is significantly shortened.

[0063] like Figure 7 and Figure 8 As shown, the thermal liquid pipeline includes a thermal liquid main pipeline 16, a thermal liquid branch pipeline 15, and a thermal liquid pipe connected to each heating liquid bag 21. One end of the thermal liquid main pipeline 16 is connected to the hydraulic pump 12, and the other end distributes the thermal liquid to the thermal liquid pipe connected to each heating liquid bag 21 through the thermal liquid branch pipeline 15. Similarly, after heating is completed, the thermal liquid in the heating liquid bag 21 returns to the thermal liquid tank 11 through the thermal liquid pipe, the thermal liquid branch pipeline 15 and the thermal liquid main pipeline 16 connected thereto.

[0064] Furthermore, a heat-insulating material is disposed outside the heat-conducting liquid main line 16 to reduce heat dissipation.

[0065] like Fig.10 As shown, a specific embodiment is used to illustrate the stationary process of the battery cell stationary device of the present invention.

[0066] After placing the stationary tray 31 loaded with the battery cells 4 into the stationary rack 3, the heating module 2 is lowered by the lifting device so that the heating liquid bag is inserted into the gap between the adjacent battery cells 4 in the tray; the thermal liquid is transported into the heating liquid bag 21 by the thermal liquid transmission module 1, and after the heating liquid bag 21 is inflated to fit the battery cells 4, the heating device in the heating liquid bag 21 starts constant temperature heating until the battery cells are stationary. After the battery cells are stationary, the heating module 2 stops heating, and the thermal liquid transmission module 3 extracts the thermal liquid from the heating liquid bag into the thermal liquid box 11, and the heating liquid bag 21 shrinks and detaches from the battery cells. After the heating module is raised by the lifting device to remove the heating liquid bag 21 from the battery cell stationary tray 31, the stationary tray is taken out of the stationary rack.

[0067] The battery cell stationary device of the present invention can implement independent temperature control and temperature control in a small range for each stationary rack, effectively avoiding the defects of uneven spatial distribution and temperature fluctuation over time. At the same time, by heating and cooling the individual stationary racks to form a relatively sealed individual body, the heat transfer channel is significantly shortened, which can effectively reduce energy consumption.

[0068] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The terms "include" or "comprises" and similar words used in the present invention mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. In the description of the present invention, the orientation or position relationship indicated by the term "vertical" and the like is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, the relative position relationship may also change accordingly, so it cannot be understood as a limitation of the present invention.

[0069] At this point, it should be appreciated by those skilled in the art that, although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell constant temperature static device, comprising a static rack, characterized in that: The stationary rack includes a plurality of stationary units, and a plurality of battery cells are arranged in a queue in the stationary units, wherein a heating module is arranged between adjacent battery cells of each stationary unit, and the heating module can adhere to the battery cells located on both sides of the heating module when stationary and continuously heat the battery cells.

2. The battery cell constant temperature static device according to claim 1, characterized in that: The heating module includes multiple double-layer heating liquid bags, and the heating liquid bags are provided with a thermal liquid external port and an external wiring port. The thermal liquid external port is used to introduce / discharge thermal liquid into / from the heating liquid bag. A heating component is provided in the inner layer of the heating liquid bag, and the heating component is connected to an external power supply through the external wiring port to heat the thermal liquid in the heating liquid bag.

3. The battery cell constant temperature static device according to claim 2, characterized in that: The battery cell constant temperature static device also includes a thermal liquid transmission module, which is connected to the thermal liquid external port of the heating liquid bag through a thermal liquid pipeline to control the circulation of the thermal liquid in the heating module and control the expansion and contraction of the heating module.

4. The battery cell constant temperature static device according to claim 2, characterized in that: The battery cell constant temperature static device also includes a lifting device, through which the heating module is inserted from above the battery cell into the gap between adjacent battery cells, and is separated from the battery cell from above the battery cell through the lifting device.

5. The battery cell constant temperature static device according to claim 2, characterized in that: The stationary unit includes a battery cell stationary tray. Each battery cell stationary tray is a box-shaped body with an open top. The periphery and bottom of the box are sealed. The battery cells are arranged in a queue in the battery cell stationary tray.

6. The battery cell constant temperature static device according to claim 5, characterized in that: The heating device also includes a fixing frame, the heating liquid bag is fixed on the fixing frame, the heating liquid bag corresponds to the gap between adjacent battery cells one by one, and the fixing frame is lifted and lowered by a lifting device.

7. The battery cell constant temperature static device according to claim 6, characterized in that: The heating module further comprises a temperature control unit, which is connected to the heating component in the heating liquid bag to control the temperature of the heat transfer liquid in the heating liquid bag.

8. The battery cell constant temperature static device according to claim 5, characterized in that: The number of the battery cell resting trays corresponds to the number of the heating modules.

9. The battery cell constant temperature static device according to claim 2, characterized in that: The heat transfer fluid is a mixture of mineral oil, synthetic oil and organic matter.

10. The battery cell constant temperature static device according to claim 8, characterized in that: The battery cell static tray includes a tray outer frame, the circumferential surface and the bottom surface of the tray outer frame are sealed, one or more tray inner frames are arranged in the tray outer frame, each of the tray inner frames includes a plurality of spaced-apart limit platforms for placing the battery cells, the heating module is arranged between adjacent limit platforms, the width L1 of the limit platforms is greater than the width L2 of the battery cells, and the length of the limit platforms is greater than the length of the heating module.

11. The battery cell constant temperature static device according to claim 2, characterized in that: The heating component is a mesh-shaped resistance heating wire or a rod-shaped or U-shaped tubular heating block.

12. The battery cell constant temperature static device according to claim 3, characterized in that: A plurality of the stationary units are stacked and arranged on the stationary rack, the thermal liquid transmission module is located on the top layer of the stationary rack, and is connected to the thermal liquid external connection port of the heating liquid bag of each layer of the stationary unit through a thermal liquid pipeline.

13. The battery cell constant temperature static device according to claim 12, characterized in that: The thermal fluid transmission module includes a thermal fluid tank, a hydraulic pump, a flow valve, a pressure sensor and a thermal fluid pipeline. The pressure sensor and the flow valve correspond to the stationary tray. The pressure sensor inputs a pressure signal to the flow valve to form a pressure control closed loop, thereby realizing independent control of the thermal fluid branch pipe pressure of each tray.

14. The battery cell constant temperature static device according to claim 13, characterized in that: Each heat transfer liquid pipeline connected to the heating liquid bag is collected into a heat transfer liquid main pipeline and connected to the hydraulic pump. A heat insulation material is arranged outside the heat transfer liquid main pipeline to reduce heat dissipation.

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