Lithium battery baking system

Abstract

The utility model relates to a lithium battery baking system. The system comprises a heat pump heating module, a baking use module and a waste heat recovery module, the heat pump heating module comprises a first water tank, a second water tank, a third water tank, a fourth water tank and a heat pump, the heat pump comprises an evaporation side and a condensation side, and the first water tank and the second water tank are connected with the evaporation side and the baking use module respectively; the input end of the waste heat recovery module is connected with the second water tank, and the output end of the waste heat recovery module is connected with the first water tank. Compared with the prior art, the device has the advantages of reducing electric energy consumption, effectively reducing heat loss and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of battery baking technology, in particular to a lithium battery baking system. Background Art

[0002] The battery baking process is one of the key links in the battery manufacturing process, which is mainly used to bake the battery and remove moisture from the battery.

[0003] Currently, battery baking typically utilizes electric heating. For example, prior art discloses a battery baking device and system, which includes a support fixture, a heat-conducting assembly, and a piping assembly. The piping assembly is partially disposed within the heat-conducting assembly, through which a heat-conducting medium flows to heat the heat-conducting assembly. The heat-conducting assembly is disposed within the support fixture. When the battery baking device heats the battery, the active end of the heat-conducting assembly contacts the battery's terminal, thereby heating the terminal. However, battery baking using electric heating still suffers from high heat loss, high energy consumption, and a lack of waste heat recovery. Utility Model Content

[0004] The purpose of the utility model is to provide a lithium battery baking system in order to overcome the defects of the above-mentioned prior art, such as large heat loss, high energy consumption and no waste heat recovery.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model provides a lithium battery baking system, comprising a heat pump heating module, a baking module and a waste heat recovery module, the heat pump heating module comprising a first water tank, a second water tank, a third water tank, a fourth water tank and a heat pump, the heat pump comprising an evaporation side and a condensation side, the first water tank and the second water tank are respectively connected to the evaporation side and the baking module, the third water tank and the fourth water tank are respectively connected to the condensation side and the baking module, the input end of the waste heat recovery module is connected to the second water tank, and the output end is connected to the first water tank.

[0007] As a preferred technical solution, the input end of the first water tank is connected to the baking module and the waste heat recovery module, and the output end is connected to the evaporation side; the input end of the second water tank is connected to the evaporation side, and the output end is connected to the baking module and the waste heat recovery module; the input end of the third water tank is connected to the condensation side, and the output end is connected to the baking module; the input end of the fourth water tank is connected to the baking module, and the output end is connected to the condensation side.

[0008] As a preferred technical solution, the first water tank includes an electric auxiliary heating mechanism.

[0009] As a preferred technical solution, the baking module includes a drying furnace and a cooling furnace. The drying furnace is connected to the third water tank and the fourth water tank respectively, and the cooling furnace is connected to the second water tank and the first water tank respectively.

[0010] As a preferred technical solution, the waste heat recovery module includes a volumetric heat exchange unit, a sealing nail chiller heat exchange unit, a baking vacuum heat exchange unit, a primary liquid injection vacuum heat exchange unit and a secondary liquid injection vacuum heat exchange unit. The input end of each unit is connected to the output end of the second water tank, and the output end is connected to the input end of the first water tank.

[0011] As a preferred technical solution, the divided-capacity heat exchange unit includes a gas-liquid heat exchanger and a divided-capacity power supply cabinet connected to the gas-liquid heat exchanger, the output end of the second water tank is connected to the gas-liquid heat exchanger, and the gas-liquid heat exchanger is connected to the input end of the first water tank.

[0012] As a preferred technical solution, the sealing nail chiller heat exchange unit includes a first plate heat exchanger and a sealing nail chiller connected to the first plate heat exchanger, the output end of the second water tank is connected to the first plate heat exchanger, and the first plate heat exchanger is connected to the input end of the first water tank.

[0013] As a preferred technical solution, the baking vacuum heat exchange unit includes a second plate heat exchanger and a baking vacuum pump connected to the second plate heat exchanger, the output end of the second water tank is connected to the second plate heat exchanger, and the second plate heat exchanger is connected to the input end of the first water tank.

[0014] As a preferred technical solution, the one-time liquid injection vacuum heat exchange unit includes a third plate heat exchanger and a one-time liquid injection vacuum pump connected to the third plate heat exchanger, the output end of the second water tank is connected to the third plate heat exchanger, and the third plate heat exchanger is connected to the input end of the first water tank.

[0015] As a preferred technical solution, the secondary liquid injection vacuum heat exchange unit includes a fourth plate heat exchanger and a secondary liquid injection vacuum pump connected to the fourth plate heat exchanger, the output end of the second water tank is connected to the fourth plate heat exchanger, and the fourth plate heat exchanger is connected to the input end of the first water tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The lithium battery baking system provided by the present invention adopts a heat pump heating module to provide battery baking heating. The theoretical comprehensive energy efficiency (COP) of the heat pump heating module is about 2.8, while the theoretical heat conversion efficiency of traditional electric heating is about 0.7. The actual thermal efficiency of on-site electric heating baking is about 0.52. Therefore, the present invention can significantly reduce power consumption and effectively reduce heat loss.

[0018] 2. The lithium battery baking system provided by the present invention adopts a waste heat recovery module to realize the waste heat recovery and utilization of the formation process workshop. The waste heat of each process workshop is recovered and stored in the first water tank, and supplied to the evaporation side of the heat pump in the heat pump heating module for absorption. The first water tank is provided with an electric auxiliary heating mechanism, which can effectively solve the problem of no heat absorption on the evaporation side of the heat pump system when the waste heat recovery module and the baking module are not working synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Provides a schematic diagram of the structure of the system for the embodiment of the utility model;

[0020] Figure 2 This is a schematic structural diagram of a heat pump heating module in an embodiment of the present utility model;

[0021] Figure 3 This is a structural diagram of a baking module in an embodiment of the present utility model;

[0022] Figure 4 This is a structural diagram of the waste heat recovery module in an embodiment of the present utility model;

[0023] Figure 5 Provide a working principle diagram of the system for this utility model;

[0024] Among them: 1. Heat pump heating module; 2. Baking use module; 3. Waste heat recovery module; 11. First water tank; 12. Second water tank; 13. Third water tank; 14. Fourth water tank; 15. Heat pump; 21. Drying furnace; 22. Cooling furnace; 23. Clamp trolley; 24. RGV trolley; 31. Volumetric heat exchange unit; 32. Sealing nail chiller heat exchange unit; 33. Baking vacuum heat exchange unit; 34. Primary liquid injection vacuum heat exchange unit; 35. Secondary liquid injection vacuum heat exchange unit; 331. Baking vacuum pump; 341. Primary liquid injection vacuum pump; 351. Secondary liquid injection vacuum pump. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0027] Furthermore, the terms "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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0028] Example:

[0029] like Figure 1 As shown, this embodiment provides a lithium battery baking system, including a heat pump heating module 1, a baking module, i.e., a baking module 2, and a waste heat recovery module 3. The heat pump heating module 1 includes a first water tank 11, a second water tank 12, a third water tank 13, a fourth water tank 14, and a heat pump 15. The heat pump 15 includes an evaporation side and a condensation side. The first water tank 11 and the second water tank 12 are respectively connected to the evaporation side and the baking module 2. The third water tank 13 and the fourth water tank 14 are respectively connected to the condensation side and the baking module 2. The input end of the waste heat recovery module 3 is connected to the second water tank 12, and the output end is connected to the first water tank 11. The connection method in this embodiment is pipeline connection, and the connecting pipeline is equipped with a variable frequency water pump, a one-way valve, and a manual ball valve.

[0030] like Figure 2As shown, the heat pump heating module 1 includes a total of four heat pumps 15, each of which has an evaporation side and a condensation side. Specifically, the input end of the first water tank 11 is connected to the baking module 2 and the waste heat recovery module 3 via a manual ball valve and a variable frequency water pump, and the output end is connected to the evaporation side via a manual ball valve and a variable frequency water pump. The input end of the second water tank 12 is connected to the evaporation side via a manual ball valve, and the output end is connected to the baking module 2 and the waste heat recovery module 3 via a manual ball valve and a variable frequency water pump. The input end of the third water tank 13 is connected to the condensation side via a manual ball valve and a variable frequency water pump, and the output end is connected to the baking module 2 via a manual ball valve. The input end of the fourth water tank 14 is connected to the baking module 2 via a manual ball valve, a one-way valve, and a variable frequency water pump, and the output end is connected to the condensation side via a manual ball valve. The first water tank 11 is equipped with an electric auxiliary heating mechanism.

[0031] like Figure 3 As shown, the baking module 2 includes a drying furnace 21, a cooling furnace 22, a clamp trolley 23 and a rail shuttle trolley, namely the RGV trolley 24. The drying furnace 21 is respectively connected to the output end of the third water tank 13 and the input end of the fourth water tank 14, and the cooling furnace 22 is respectively connected to the output end of the second water tank 12 and the input end of the first water tank 11. The clamp trolley 23 transports the battery trays, and carries 6 trays at a time and places them in the corresponding drying furnace 21 (the clamp trolley 23 and the battery tray together). The clamp trolley 23 is an unpowered trolley driven by the RGV trolley 24. The RGV trolley 24 transports the clamp trolley 23 to the target position. It consists of a ground rail and a trolley and is installed in the middle of the drying furnaces 21 on both sides.

[0032] like Figure 4 As shown, the waste heat recovery module 3 includes a volumetric heat exchange unit 31, a sealing nail chiller heat exchange unit 32, a baking vacuum heat exchange unit 33, a primary liquid injection vacuum heat exchange unit 34 and a secondary liquid injection vacuum heat exchange unit 35. The input end of each unit is connected to the output end of the second water tank 12, and the output end is connected to the input end of the first water tank 11.

[0033] The capacity-dividing heat exchange unit 31 includes a gas-liquid heat exchanger and a capacity-dividing power supply cabinet connected to a pipeline of the gas-liquid heat exchanger, and a manual ball valve is provided on the pipeline. Figure 4The figure shows two groups of gas-liquid heat exchangers and corresponding capacity-controlled power supply cabinets. Each gas-liquid heat exchanger includes an air inlet, an air outlet, a water inlet, and a water outlet. One group includes three capacity-controlled power supply cabinets, while the other group has four. Each capacity-controlled power supply cabinet delivers hot air to its corresponding gas-liquid heat exchanger via the air inlet. After heat exchange, it outputs cold air through the air outlet. Simultaneously, the output end of the second water tank 12 is connected to the water inlet of the gas-liquid heat exchanger via a manual ball valve and a variable-frequency water pump. The water outlet of the gas-liquid heat exchanger is connected to the input end of the first water tank 11. Therefore, the second water tank 12 delivers cold water to the gas-liquid heat exchanger via the water inlet, and after heat exchange, it delivers hot water to the first water tank 11 through the water outlet.

[0034] Figure 4 As shown in the figure, the sealed nail chiller heat exchange unit 32 includes two sets of first plate heat exchangers and a sealed nail chiller connected to the first plate heat exchangers. The output end of the second water tank 12 is connected to the water inlet of the first plate heat exchanger via a manual ball valve and a variable frequency water pump. The water outlet of the first plate heat exchanger is also connected to the input end of the first water tank 11 via a manual ball valve and a variable frequency water pump. Therefore, the second water tank 12 delivers cold water to the first plate heat exchanger through the water inlet and, in conjunction with the corresponding chiller, delivers hot water to the first water tank 11 through the water outlet.

[0035] The baking vacuum heat exchange unit 33 includes a second plate heat exchanger and a baking vacuum pump 331 connected to the second plate heat exchanger. The output of the second water tank 12 is connected to the water inlet of the second plate heat exchanger via a manual ball valve and a variable-frequency water pump. The water outlet of the second plate heat exchanger is also connected to the input of the first water tank 11 via a manual ball valve and a variable-frequency water pump. Therefore, the second water tank 12 delivers cold water to the second plate heat exchanger through its water inlet and, in conjunction with the baking vacuum pump 331, delivers hot water to the first water tank 11 through its water outlet.

[0036] The primary injection vacuum heat exchange unit 34 includes a third plate heat exchanger and a primary injection vacuum pump 341 connected to the third plate heat exchanger. The output of the second water tank 12 is connected to the water inlet of the third plate heat exchanger via a manual ball valve and a variable-frequency water pump. The water outlet of the third plate heat exchanger is also connected to the input of the first water tank 11 via a manual ball valve and a variable-frequency water pump. Therefore, the second water tank 12 delivers cold water to the third plate heat exchanger through its water inlet and, in conjunction with the primary injection vacuum pump 341, delivers hot water to the first water tank 11 through its water outlet.

[0037] The secondary liquid injection vacuum heat exchange unit 35 includes a fourth plate heat exchanger and a secondary liquid injection vacuum pump 351 connected to the fourth plate heat exchanger. The output of the second water tank 12 is connected to the water inlet of the fourth plate heat exchanger via a manual ball valve and a variable frequency water pump. The water outlet of the fourth plate heat exchanger is also connected to the input of the first water tank 11 via a manual ball valve and a variable frequency water pump. Therefore, the second water tank 12 delivers cold water to the fourth plate heat exchanger through the water inlet and, in conjunction with the secondary liquid injection vacuum pump 351, delivers hot water to the first water tank 11 through the water outlet.

[0038] like Figure 5 As shown, the working principle of the lithium battery baking system provided in this embodiment is as follows:

[0039] Heat pump heating module 1: Provides heat for battery baking. The condensing side of heat pump 15 generates 120°C heat, which is stored in the third water tank 13 (i.e., pressure water tank 3) as a water medium. Heat is then transported to the drying oven 21 of baking module 2 for heating the batteries. The evaporating side absorbs heat and generates 15°C cold water, which is stored in the second water tank 12 (i.e., water tank 2) and transported to the cooling oven 22 of baking module 2 for cooling the batteries.

[0040] Baking module 2: Serves as a battery heating and cooling terminal. 120°C water is pumped into drying oven 21 by a variable-frequency water pump to heat and dry the batteries. Heating temperature accuracy is achieved by controlling the water flow rate using the variable-frequency water pump. 15°C cold water is pumped into cooling oven 22 by a variable-frequency water pump to cool the dried batteries.

[0041] Waste Heat Recovery Module 3: Reuses waste heat from the various process workshops in the chemical formation section. Waste heat from each process workshop is recovered and stored in first water tank 11 (i.e., water tank 1), which is then absorbed by the evaporation side of heat pump 15. First water tank 11 is designed with an electric auxiliary heating function to resolve the problem of heat pump heating module 1 failing to absorb heat on the evaporation side when waste heat recovery module 3 and baking module 2 operate out of sync.

[0042] It's important to note that the formation section includes multiple components, including baking, primary injection, formation, and secondary injection. Waste heat recovered from each workshop in the formation section is used to generate heat for absorption cooling on the evaporation side of heat pump 15, providing battery cooling and process temperature reduction in the formation section. The condensation side of heat pump 15 also generates heat for heating module 2 in the baking section.

[0043] Compared with existing battery heating methods, the lithium battery baking system provided in this embodiment has at least the following advantages:

[0044] (1) Heat pump heating has a heating energy efficiency greater than 1, while the thermal efficiency of other heating methods is less than 1, which has the advantages of high efficiency and energy saving;

[0045] (2) The entire baking system based on heat pump heating can produce cooling and heating. The heating is used for heating and drying the battery instead of the existing electric heating, and the cooling is used for cooling the battery. The water chiller equipment in the workshop can be eliminated, reducing energy consumption and investment costs.

[0046] (3) Using water as a heat transfer medium, the specific heat capacity of air is about 1KJ / (kg·K), the specific heat capacity of thermal oil is 0.76KJ / (kg·K), and the specific heat capacity of water is 4.2KJ / (kg·K). Compared with air and thermal oil media, it has higher heat transfer density and investment cost advantages;

[0047] (4) The heat storage tank on the evaporation side of the heat pump is designed with an electric auxiliary heating function to avoid affecting the normal operation of the heat pump when the absorption temperature is too low, and the system stability is good.

[0048] (5) When the waste heat recovery water temperature is above 30°C and the heat pump output water temperature is 120°C, the system heating energy efficiency COP is greater than 2.3. The higher the waste heat recovery water temperature, the higher the heat pump energy efficiency and the more energy-saving the baking.

[0049] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A lithium battery baking system, characterized in that: It includes a heat pump heating module, a baking module and a waste heat recovery module. The heat pump heating module includes a first water tank, a second water tank, a third water tank, a fourth water tank and a heat pump. The heat pump includes an evaporation side and a condensation side. The first water tank and the second water tank are respectively connected to the evaporation side and the baking module. The third water tank and the fourth water tank are respectively connected to the condensation side and the baking module. The input end of the waste heat recovery module is connected to the second water tank, and the output end is connected to the first water tank.

2. The lithium battery baking system according to claim 1, characterized in that: The input end of the first water tank is connected to the baking module and the waste heat recovery module, and the output end is connected to the evaporation side. The input end of the second water tank is connected to the evaporation side, and the output end is connected to the baking module and the waste heat recovery module. The input end of the third water tank is connected to the condensation side, and the output end is connected to the baking module. The input end of the fourth water tank is connected to the baking module, and the output end is connected to the condensation side.

3. The lithium battery baking system according to claim 1, characterized in that: The first water tank includes an electric auxiliary heating mechanism.

4. The lithium battery baking system according to claim 1, characterized in that: The baking module includes a drying furnace and a cooling furnace. The drying furnace is connected to the third water tank and the fourth water tank respectively, and the cooling furnace is connected to the second water tank and the first water tank respectively.

5. The lithium battery baking system according to claim 1, characterized in that: The waste heat recovery module includes a volumetric heat exchange unit, a sealing nail chiller heat exchange unit, a baking vacuum heat exchange unit, a primary liquid injection vacuum heat exchange unit and a secondary liquid injection vacuum heat exchange unit. The input end of each unit is connected to the output end of the second water tank, and the output end is connected to the input end of the first water tank.

6. The lithium battery baking system according to claim 5, characterized in that: The divided-capacity heat exchange unit includes a gas-liquid heat exchanger and a divided-capacity power supply cabinet connected to the gas-liquid heat exchanger. The output end of the second water tank is connected to the gas-liquid heat exchanger, and the gas-liquid heat exchanger is connected to the input end of the first water tank.

7. The lithium battery baking system according to claim 5, characterized in that: The sealing nail chiller heat exchange unit includes a first plate heat exchanger and a sealing nail chiller connected to the first plate heat exchanger, the output end of the second water tank is connected to the first plate heat exchanger, and the first plate heat exchanger is connected to the input end of the first water tank.

8. The lithium battery baking system according to claim 5, characterized in that: The baking vacuum heat exchange unit includes a second plate heat exchanger and a baking vacuum pump connected to the second plate heat exchanger. The output end of the second water tank is connected to the second plate heat exchanger, and the second plate heat exchanger is connected to the input end of the first water tank.

9. The lithium battery baking system according to claim 5, characterized in that: The one-time liquid injection vacuum heat exchange unit includes a third plate heat exchanger and a one-time liquid injection vacuum pump connected to the third plate heat exchanger, the output end of the second water tank is connected to the third plate heat exchanger, and the third plate heat exchanger is connected to the input end of the first water tank.

10. The lithium battery baking system according to claim 5, characterized in that: The secondary liquid injection vacuum heat exchange unit includes a fourth plate heat exchanger and a secondary liquid injection vacuum pump connected to the fourth plate heat exchanger, the output end of the second water tank is connected to the fourth plate heat exchanger, and the fourth plate heat exchanger is connected to the input end of the first water tank.

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