Lithium battery negative pressure formation integrated equipment and test cabinet

Abstract

The utility model discloses lithium battery negative pressure formation integrated equipment, including test needle bed and thermotank, test needle bed includes power supply host, negative pressure module and two sampling probe module, the thermotank is provided with sampling probe module and battery module in layering, battery module is located between the two sampling probe module, and the sampling probe module is located between the two sampling probe module. Wherein one sampling probe module is provided with a negative pressure module, the power supply host is arranged on the upper sampling probe module, the sampling probe modules are electrically connected with the power supply host, the sampling probe modules are used for being connected with tabs of lithium batteries to charge and discharge the lithium batteries, and the negative pressure module is used for being communicated with liquid injection holes of the lithium batteries. The power supply host is used for providing internal information of the lithium battery for charging and discharging sampling. According to the lithium battery host and needle bed combined structure, the equipment size can be reduced, cold air cooling is added to the host, the material cost is reduced, power consumption and impedance can be reduced, heat dissipation is enhanced, the host is convenient to maintain, and the maintenance time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production and testing equipment, in particular to a lithium battery negative pressure forming integrated equipment and a testing cabinet. Background Art

[0002] Battery formation and capacity division are important procedures in the battery manufacturing process. Simply put, battery formation is the chemical and electrochemical reaction process of activating the battery and converting it into a charged state through charging and discharging to remove impurities and improve the electrochemical activity of its active substances. At present, battery formation and capacity division use separate power cabinets and battery cabinets to separate the power supply part and the battery part. The power supply part integrates the power supply required for battery charging and discharging as well as its own fire protection and heat dissipation system; the battery part is also called the needle bed part, which integrates the needle bed, probe module, cylinder and its own fire protection and heat dissipation system.

[0003] At present, the existing square battery test needle bed structure is that the needle bed and the power supply host are separated. The needle bed and the host need to be separated by a wall and connected by a long cable in the middle. The power supply host relies on ambient air for cooling. The existing structure has the following problems and disadvantages:

[0004] (1) The needle bed and power supply host are separated and occupy a large space, making circuit inspection and maintenance difficult;

[0005] (2) The needle bed and the power supply host are connected by cables. The cable stacking has poor heat dissipation effect, increases power consumption and impedance, increases material costs, and also causes signal attenuation or interference;

[0006] (3) The power supply host relies on the ambient temperature for cooling, resulting in the internal motherboard not being cooled sufficiently, which easily causes heat and damage to components. Utility Model Content

[0007] The utility model aims to provide a negative pressure forming integrated device and a test cabinet for lithium batteries, so as to solve the problems existing in the above-mentioned prior art, reduce the size of the device, and facilitate circuit inspection and maintenance.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a lithium battery negative pressure formation integrated device, including a test needle bed and a constant temperature box, the test needle bed includes a power supply mainframe, a negative pressure module and two sampling probe modules, the sampling probe module and the battery module are layered in the constant temperature box, the battery module is located between the two sampling probe modules, one of the sampling probe modules is provided with the negative pressure module, the power supply mainframe is arranged on the upper sampling probe module, the sampling probe module is electrically connected to the power supply mainframe, the sampling probe module is used to connect the pole ear of the lithium battery to charge and discharge the lithium battery, the negative pressure module is used to connect the injection hole of the lithium battery, absorb a part of the electrolyte of the lithium battery during charging and discharging, and flow back into the lithium battery after the battery completes the formation process, and the power supply mainframe is used to provide internal information of the lithium battery for charging and discharging sampling.

[0010] Preferably, the sampling probe module includes a sampling probe and a mounting frame, the sampling probes are evenly plugged into the bottom plate of the mounting frame, the sampling probes are positive sampling probes or negative sampling probes and are electrically connected to the electrodes corresponding to the power supply host, the positive sampling probes are arranged above the battery module, and the negative sampling probes are arranged correspondingly below.

[0011] Preferably, the mounting frame is U-shaped, and an installation box for the power supply host is arranged above the mounting frame, the power supply host is arranged in the installation box, and a power supply wiring port is arranged on the installation box, and the wiring port is connected to the sampling probe one-to-one through a wire, and the length of the wire is not more than 20 cm.

[0012] Preferably, handles are symmetrically arranged on the side walls of the mounting frame, and a plurality of groups of sampling probe modules are arranged in parallel.

[0013] Preferably, the negative pressure module includes an internally hollow negative pressure cup and a suction nozzle, one end of the negative pressure cup is connected to the suction nozzle, and the other end is connected to the negative pressure pipe bus, the suction nozzle is used to connect with the liquid filling port of the lithium battery on the battery module, and the outside of the suction nozzle is provided with an arc-shaped limit sleeve, and the limit sleeve is gap-matched with the suction nozzle.

[0014] Preferably, the battery module comprises a battery tray and lithium batteries, a plurality of the lithium batteries are arranged in a matrix on the battery tray, and each of the lithium batteries corresponds to one positive electrode sampling probe and one negative electrode sampling probe.

[0015] Preferably, a layered bracket is provided in the constant temperature box, and the layered bracket includes a bottom plate, a middle plate and a top plate, and the bottom plate is connected to the top plate by four guide columns, and the guide columns are telescopic columns, and the lower end of the outer cylinder of the telescopic column is connected to the middle plate, and the lower end of the inner cylinder is connected to the bottom plate, and the upper end of the inner cylinder is sleeved in the lower end of the outer cylinder, and two cylinders are symmetrically arranged between the bottom plate and the top plate, and a sampling probe module is respectively installed on the bottom plate and the top plate, and the battery module is arranged on the middle plate.

[0016] Preferably, the top plate divides the constant temperature box into a cooling area and a normal temperature area, and a circulating fan is provided at the air inlet and outlet of the cooling area and the normal temperature area. The power supply host is located in the cooling area, and the negative pressure module and the two sampling probe modules are located in the normal temperature area.

[0017] Preferably, a condenser is provided on the side wall of the cooling area, the condenser is located in a cooling air chamber, one end of the cooling air chamber is directly connected to one end of the cooling area, and the other end is connected to the other end of the cooling area through a circulation channel, forming a cooling circulation air path; a normal temperature air chamber is provided on one side of the constant temperature box, the lower end of the normal temperature air chamber is directly connected to one end of the normal temperature area, and the upper end is connected to the other end of the normal temperature area through a circulation channel, forming a normal temperature circulation air path, and the cooling air chamber is provided in the normal temperature air chamber.

[0018] The utility model relates to a negative pressure formation test cabinet for lithium batteries, comprising the above-mentioned lithium battery negative pressure formation integrated equipment and a cabinet, wherein a plurality of the negative pressure formation integrated equipment for lithium batteries are arranged in the cabinet.

[0019] Compared with the prior art, the utility model has achieved the following technical effects:

[0020] The lithium battery host and needle bed combined structure of the utility model can reduce the size of the equipment, increase cooling of the host, reduce material costs, reduce power consumption and impedance, enhance heat dissipation, and facilitate maintenance of the host, reducing maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the appearance of a negative pressure integrated device for lithium batteries in an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the negative pressure integrated device for lithium batteries in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the test needle bed in the embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the power supply host and the sampling probe module in the embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the negative pressure module in the embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the battery module in the embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the sampling probe in the embodiment of the utility model;

[0029] Figure 8 This is an enlarged structural diagram of the negative pressure module in the embodiment of the utility model;

[0030] Among them: 1-constant temperature box, 2-power host, 3-negative pressure module, 4-positive sampling probe, 5-battery module, 6-mounting frame, 7-mounting box, 8-sampling probe, 9-negative sampling probe, 10-lithium battery, 11-battery tray, 12-condenser, 13-normal temperature air chamber, 14-cooling air chamber, 15-top plate, 16-negative pressure cup, 17-suction nozzle, 18-telescopic column, 19-cylinder, 20-circulation channel, 21-wire, 22-circulation fan. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model aims to provide a negative pressure forming integrated device and a test cabinet for lithium batteries, so as to solve the problems existing in the prior art, reduce the size of the device, and facilitate circuit inspection and maintenance.

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figures 1 to 8 As shown: This embodiment provides a lithium battery negative pressure formation integrated device, including a test needle bed and a constant temperature box 1, the test needle bed includes a power supply host 2, a negative pressure module 3 and two sampling probe modules, the constant temperature box 1 is layered with sampling probe modules and battery modules 5, the battery module 5 is located in the middle of the two sampling probe modules, one of the sampling probe modules is provided with a negative pressure module 3, the power supply host 2 is arranged on the upper sampling probe module, the sampling probe module is electrically connected to the power supply host 2, the sampling probe module is used to connect the pole ear of the lithium battery 10 to charge and discharge the lithium battery 10, the negative pressure module 3 is used to connect the injection hole of the lithium battery 10, absorb part of the electrolyte of the lithium battery 10 during charging and discharging, and then flow back into the lithium battery 10 after the battery completes the formation process, and the power supply host 2 is used to provide internal information of the lithium battery 10 for charging and discharging sampling.

[0035] As an optional solution, the sampling probe module in this embodiment includes a sampling probe 8 and a mounting frame 6. The sampling probes 8 are evenly connected to the bottom plate of the mounting frame 6. The sampling probes 8 are positive sampling probes 4 or negative sampling probes 9 and are electrically connected to the electrodes corresponding to the power supply host 2. The positive sampling probes 4 are arranged above the battery module 5, and the negative sampling probes 9 are arranged below. The positive sampling probe module is fixed at the top, and when the cylinder 19 contracts, the negative module and the battery module 5 are driven to rise together, so that the positive and negative electrodes of the battery contact the sampling probes 8, which is convenient for charging and discharging.

[0036] As an optional solution, the mounting frame 6 in this embodiment is U-shaped, and a mounting box 7 of the power supply host 2 is arranged above the mounting frame 6. The power supply host 2 is arranged in the mounting box 7, and a wiring port of the power supply is arranged on the mounting box 7. The wiring port is connected to the sampling probe 8 one by one through a wire 21, and the length of the wire 21 is not more than 20cm. In this embodiment, the circuit board such as the power supply host 2 is installed inside the mounting box 7 to form an integrated type, which reduces power consumption and material costs, and reduces the space occupied by the structure compared with the split type; the test probe is assembled with the power supply host 2, which is convenient for maintenance personnel to disassemble, inspect and repair. The power supply host 2 is used to detect the internal capacity of the battery and receive accessories such as signals. The power supply host 2 only exposes the wiring terminal for connection with the sampling probe 8; the sampling probe 8 and the negative pressure cup module are used to contact the lithium battery 10 pole ear to detect the internal situation of the battery, and the negative pressure cup module is used to produce the lithium battery 10 during the formation process, sucking away part of the electrolyte inside the battery to prevent the liquid from overflowing, and then returning the liquid to the battery when the process is completed.

[0037] As an optional solution, in this embodiment, handles are symmetrically arranged on the side walls of the mounting frame 6 for easy holding and assembly. Several groups of sampling probe modules are arranged in parallel. The number and polarity of the positive sampling probes 4 or the negative sampling probes 9 correspond one-to-one to the number and polarity of the lithium batteries 10 in the battery module 5 to ensure that the battery is connected to the power supply during the formation process.

[0038] As an optional solution, the negative pressure module 3 in this embodiment includes a hollow negative pressure cup 16 and a suction nozzle 17. One end of the negative pressure cup 16 is connected to the suction nozzle 17 and the other end is connected to the negative pressure pipe bus. The suction nozzle 17 is used to communicate with the liquid injection port of the lithium battery 10 on the battery module 5. The outside of the suction nozzle 17 is provided with an arc-shaped limit sleeve, and the limit sleeve and the suction nozzle 17 are gap-matched. Among them, the negative pressure pipe bus is used to communicate with the vacuum pumping equipment to provide negative pressure for the suction nozzle 17 to suck away part of the electrolyte in the battery.

[0039] As an optional solution, the battery module 5 in this embodiment includes a battery tray 11 and lithium batteries 10. A plurality of lithium batteries 10 are arranged in a matrix on the battery tray 11. Each lithium battery 10 corresponds to a positive sampling probe 4 and a negative sampling probe 9. The positive pole ear of each battery is connected to the positive sampling probe 4, and the negative pole ear is connected to the negative sampling probe 9. The battery tray 11 is used to place the lithium batteries 10. During production, a full tray of batteries can be placed inside the needle bed module.

[0040] As an optional solution, in this embodiment, a layered bracket is provided in the thermostatic box 1, and the layered bracket includes a bottom plate, a middle plate and a top plate 15. The top plate 15 is connected by four guide columns, and the guide columns are telescopic columns 18. The lower end of the outer cylinder of the telescopic column 18 is connected to the middle plate, and the lower end of the inner cylinder is connected to the bottom plate. The upper end of the inner cylinder is sleeved in the lower end of the outer cylinder. Two cylinders 19 are symmetrically arranged between the bottom plate and the top plate 15. A sampling probe module is installed on the bottom plate and the top plate 15 respectively, and a battery module 5 is arranged on the middle plate. When used in this embodiment, the cylinder 19 first drives the negative electrode sampling probe 9 on the bottom plate to move upward and connect with the negative electrode ear of the lithium battery 10 on the battery module 5 (pressing contact and conducting). Due to the provision of the telescopic column 18, the cylinder 19 can drive the battery module 5 on the middle plate to continue to move upward, and finally connect the positive electrode ear of the lithium battery 10 on the battery module 5 with the positive electrode sampling probe 4, and then the battery can be charged and discharged through the control of the power supply host 2.

[0041] As an optional solution, in this embodiment, the top plate 15 divides the thermostat 1 into a cooling area and a normal temperature area. A circulating fan 22 is provided at the air inlet and outlet of the cooling area and the normal temperature area. The power supply host 2 is located in the cooling area (marked by a small arrow), and the negative pressure module 3 and the two sampling probe modules are located in the normal temperature area (marked by a thick arrow), which can ensure that the heat dissipated by the production battery module 5 will not affect the power supply host 2. The upper layer where the power supply host 2 is located is cooled by the condenser 12 and the circulating fan 22. The heat source outlet of the heat exchange tube of the condenser 12 is set outside the thermostat 1, and the normal temperature zone also circulates the air inside the box through the circulating fans 22 on both sides.

[0042] As an optional solution, in this embodiment, a condenser 12 is provided on the side wall of the cooling area. The condenser 12 is located in a cooling air chamber 14, and one end of the cooling air chamber 14 is directly connected to one end of the cooling area, and the other end is connected to the other end of the cooling area through a circulation channel 20, forming a cooling circulation air path; a normal temperature air chamber 13 is provided on one side of the thermostat 1, and the lower end of the normal temperature air chamber 13 is directly connected to one end of the normal temperature area, and the upper end is connected to the other end of the normal temperature area through a circulation channel 20, forming a normal temperature circulation air path, and a cooling air chamber 14 is provided in the normal temperature air chamber 13. In this embodiment, the power supply host 2 is added with a condenser 12 for cold air cooling, which can keep the power supply host 2 at a constant temperature during production, and prevent the internal chip components of the power supply host 2 from being burned out due to excessive temperature during production.

[0043] Embodiment 2

[0044] The present embodiment relates to a lithium battery negative pressure formation test cabinet, including the lithium battery negative pressure formation integrated device and the cabinet in the above-mentioned embodiment 1. According to the site space and actual needs, a plurality of lithium battery negative pressure formation integrated devices can be stacked in the cabinet.

[0045] In this embodiment, the thermostat 1 is divided into two upper and lower areas. The upper power mainframe 2 is located in the cooling independent space and isolated from the lower layer. The condenser 12 and the circulating fan 22 are placed on the side. When the condenser 12 enters the cold air to force the mainframe part to be controlled at a certain temperature during production, the upper exhaust pipe extracts the internal airflow and then introduces it into the condenser 12 to form a cycle. The normal temperature area where the sampling probe module is placed passes through the circulation pipeline to ensure that the heat dissipated by the production battery module 5 will not affect the power mainframe 2. The side is also equipped with a fan to stir the internal airflow and stabilize the temperature. The upper exhaust pipe is installed to allow the airflow to circulate. The thermostat 1 is surrounded by insulation cotton to prevent the external temperature from affecting the internal environment. During the battery formation and charging process, a large amount of gas will be generated inside the battery and discharged from the injection port. The negative pressure makes the suction nozzle 17 closely dock with the battery injection port, and the vacuum treatment of the negative pressure to -80kpa is performed to ensure that the gas generated by the battery formation is discharged in time, and the stability and consistency of the SEI film are ensured.

[0046] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A lithium battery negative pressure forming integrated device, characterized in that: It includes a test needle bed and a constant temperature box, the test needle bed includes a power supply host, a negative pressure module and two sampling probe modules, the sampling probe module and the battery module are layered in the constant temperature box, the battery module is located in the middle of the two sampling probe modules, one of the sampling probe modules is provided with the negative pressure module, the power supply host is arranged on the upper sampling probe module, the sampling probe module is electrically connected to the power supply host, the sampling probe module is used to connect the pole ear of the lithium battery to charge and discharge the lithium battery, the negative pressure module is used to connect the injection hole of the lithium battery, absorb part of the electrolyte of the lithium battery during charging and discharging, and flow back into the lithium battery after the battery has completed the formation process, and the power supply host is used to provide internal information of the lithium battery for charging and discharging sampling.

2. The lithium battery negative pressure forming integrated equipment according to claim 1, characterized in that: The sampling probe module includes a sampling probe and a mounting frame. The sampling probes are evenly plugged into the bottom plate of the mounting frame. The sampling probes are positive sampling probes or negative sampling probes and are electrically connected to the electrodes corresponding to the power supply host. The positive sampling probes are arranged above the battery module, and the negative sampling probes are arranged correspondingly below.

3. The negative pressure forming integrated equipment for lithium batteries according to claim 2, characterized in that: The mounting frame is U-shaped, and an installation box for the power supply host is arranged above the mounting frame. The power supply host is arranged in the installation box. A power supply wiring port is arranged on the installation box. The wiring port is connected to the sampling probe one-to-one through a wire, and the length of the wire is not more than 20 cm.

4. The negative pressure forming integrated equipment for lithium batteries according to claim 2, characterized in that: The side walls of the mounting frame are symmetrically provided with handles, and the sampling probe modules are arranged in a plurality of groups in parallel.

5. The lithium battery negative pressure forming integrated equipment according to claim 1, characterized in that: The negative pressure module includes an internally hollow negative pressure cup and a suction nozzle, one end of the negative pressure cup is connected to the suction nozzle, and the other end is connected to the negative pressure pipe bus, the suction nozzle is used to connect with the liquid filling port of the lithium battery on the battery module, and an arc-shaped limit sleeve is provided on the outside of the suction nozzle, and the limit sleeve is gap-matched with the suction nozzle.

6. The lithium battery negative pressure forming integrated equipment according to claim 2, characterized in that: The battery module includes a battery tray and lithium batteries. A plurality of lithium batteries are arranged in a matrix on the battery tray, and each of the lithium batteries corresponds to one positive electrode sampling probe and one negative electrode sampling probe.

7. The negative pressure forming integrated equipment for lithium batteries according to claim 1, characterized in that: A layered bracket is arranged in the constant temperature box, and the layered bracket includes a bottom plate, a middle plate and a top plate. The bottom plate and the top plate are connected by four guide columns, and the guide columns are telescopic columns. The lower end of the outer cylinder of the telescopic column is connected to the middle plate, and the lower end of the inner cylinder is connected to the bottom plate. The upper end of the inner cylinder is sleeved in the lower end of the outer cylinder. Two cylinders are symmetrically arranged between the bottom plate and the top plate. A sampling probe module is respectively installed on the bottom plate and the top plate, and the battery module is arranged on the middle plate.

8. The lithium battery negative pressure forming integrated equipment according to claim 7, characterized in that: The top plate divides the constant temperature box into a cooling area and a normal temperature area. A circulating fan is provided at the air inlet and outlet of the cooling area and the normal temperature area. The power supply host is located in the cooling area, and the negative pressure module and the two sampling probe modules are both located in the normal temperature area.

9. The negative pressure forming integrated equipment for lithium batteries according to claim 8, characterized in that: A condenser is arranged on the side wall of the cooling area, the condenser is located in a cooling air chamber, one end of the cooling air chamber is directly connected with one end of the cooling area, and the other end is connected with the other end of the cooling area through a circulation channel, forming a cooling circulation air path; a normal temperature air chamber is arranged on one side of the constant temperature box, the lower end of the normal temperature air chamber is directly connected with one end of the normal temperature area, and the upper end is connected with the other end of the normal temperature area through a circulation channel, forming a normal temperature circulation air path, and the cooling air chamber is arranged in the normal temperature air chamber.

10. A lithium battery negative pressure formation test cabinet, characterized in that: It comprises the lithium battery negative pressure forming integrated device and a cabinet as described in any one of claims 1 to 9, wherein a plurality of the lithium battery negative pressure forming integrated devices are arranged in the cabinet.

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