Negative pressure formation device for lithium ion battery, lithium ion battery and vehicle

Abstract

The present invention relates to the field of battery technology, and specifically provides a negative pressure formation device for lithium ion batteries, a lithium ion battery and a vehicle, aiming to solve the problem that the existing lithium ion batteries are not convenient for negative pressure formation operation. To this end, the negative pressure formation device of the present invention includes a probe assembly and a negative pressure suction assembly, the probe assembly is used to connect the pole of the lithium ion battery; the negative pressure suction assembly includes a negative pressure suction nozzle and an operating part horizontally extending from the outer edge of the negative pressure suction nozzle, the operating part is connected to the probe assembly in a detachable manner, the negative pressure suction nozzle is used to connect the injection hole of the lithium ion battery, and the negative pressure suction nozzle can be well connected to the injection hole of the lithium ion battery through the probe assembly, and the probe assembly and the negative pressure suction assembly constitute an integrated structure, which is more compact and can adapt to lithium ion batteries with injection holes of various sizes at the center of the pole, so as to facilitate negative pressure formation operation; the negative pressure suction nozzle can also be installed and removed through the operating part, simplifying the assembly process.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and specifically provides a negative pressure formation device for a lithium ion battery, a lithium ion battery and a vehicle. Background Art

[0002] As a new generation of rechargeable battery products, lithium-ion batteries have the characteristics of high voltage, high energy density, long cycle life, no memory effect, and no pollution. They are widely used in the fields of automobiles, medical treatment, and military. In the production process of lithium-ion batteries, lithium-ion batteries need to be negatively pressurized. At the same time, the inside of the lithium-ion battery needs to be evacuated to remove the gas inside the lithium-ion battery to avoid damage to the lithium-ion battery.

[0003] At present, cylindrical lithium-ion batteries can be divided into small cylindrical lithium batteries and large cylindrical lithium batteries according to their capacity. Among them, small cylindrical lithium-ion batteries such as 18650 and 21700 use closed-mouth formation, and the positive and negative probes are pressed on both ends of the lithium-ion battery. The probes are single-needle and simple in structure; while large cylindrical lithium batteries use an integrated positive and negative probe (same-core needle) temperature probe module or an integrated probe (multi-needle) temperature module for negative pressure formation. However, since the injection hole of the large cylindrical lithium battery is in the center of the pole and the contact area of ​​the pole is small, no matter which of the above probes is used, it is not convenient to perform negative pressure formation operations, and the negative pressure formation requirements cannot be met, which affects the negative pressure formation effect.

[0004] Therefore, the art needs a new negative pressure formation device for lithium ion batteries, lithium ion batteries and vehicles to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing lithium ion battery is not convenient for negative pressure formation operation.

[0006] In a first aspect, the present invention provides a negative pressure formation device, which includes a probe assembly and a negative pressure suction assembly, wherein the probe assembly is used to connect the pole of the lithium-ion battery; the negative pressure suction assembly includes a negative pressure suction nozzle and an operating part extending horizontally from the outer edge of the negative pressure suction nozzle, the operating part is detachably connected to the probe assembly, and the negative pressure suction nozzle is used to connect to the injection hole of the lithium-ion battery.

[0007] In the preferred technical solution of the above-mentioned negative pressure formation device, the probe assembly includes a current probe and a voltage probe, the voltage probe is embedded in the current probe and can move relative to the current probe, and the current probe and the voltage probe are both connected to the pole; an avoidance groove is provided on the current probe, and the operating part is installed in the avoidance groove.

[0008] In the preferred technical solution of the above-mentioned negative pressure formation device, the current probe is an annular structure, and the negative pressure nozzle is located at the center of the annular structure; and / or the number of the voltage probes is multiple, and the multiple voltage probes are arranged around the circumference of the current probe.

[0009] In a preferred technical solution of the above-mentioned negative pressure formation device, the negative pressure formation device further comprises a mounting assembly, and the probe assembly and the negative pressure suction assembly are both mounted on the mounting assembly.

[0010] In the preferred technical solution of the above-mentioned negative pressure formation device, the mounting assembly includes a mounting seat, a guide post, a terminal plate, a current probe terminal post and a voltage probe terminal post. The mounting seat is provided with a first through hole, the terminal plate is provided with a second through hole, the guide post passes through the first through hole and the second through hole in sequence, the first end of the guide post is respectively connected to the current probe and the voltage probe, and the second end of the guide post is respectively connected to the current probe terminal post and the voltage probe terminal post.

[0011] In the preferred technical solution of the above-mentioned negative pressure formation device, the mounting assembly also includes a guide post and a guide sleeve arranged in the first through hole, the guide post and the guide sleeve are sleeved on the guide post, and a first preset gap is formed between the guide post and the guide post and the guide sleeve.

[0012] In the preferred technical solution of the above-mentioned negative pressure formation device, the negative pressure suction component also includes a negative pressure tube, a first end of the negative pressure tube is connected to the negative pressure suction nozzle, and a second end of the negative pressure tube is connected to an external negative pressure hose through the mounting base and the terminal board.

[0013] In the preferred technical solution of the above-mentioned negative pressure formation device, a groove is provided on the top of the negative pressure suction nozzle; the negative pressure tube includes a tube body and a flange plate arranged on the outer wall of the tube body, the first end of the tube body is inserted into the groove and fixedly connected to the negative pressure suction nozzle through the flange plate, and the second end of the tube body is connected to an external negative pressure hose through the mounting seat and the terminal plate.

[0014] In the preferred technical solution of the above-mentioned negative pressure formation device, the mounting assembly also includes a positioning nut and a spring, a third through hole is provided on the mounting seat, a fourth through hole is provided on the terminal plate, the second end of the tube body passes through the third through hole and the fourth through hole in sequence, and the tube body is fixedly connected to the mounting seat through the positioning nut; the spring is sleeved on the tube body, the first end of the spring abuts against the flange, and the second end of the spring abuts against the mounting seat.

[0015] In the preferred technical solution of the above-mentioned negative pressure formation device, the mounting assembly also includes a negative pressure tube guide sleeve arranged in the third through hole, the negative pressure tube guide sleeve is sleeved on the tube body, and a second preset gap is provided between the tube body and the negative pressure tube guide sleeve.

[0016] In the preferred technical solution of the above-mentioned negative pressure formation device, a boss structure is provided at the bottom of the negative pressure suction nozzle, and the boss structure can seal the gap between the negative pressure suction nozzle and the injection hole.

[0017] In a second aspect, the present invention provides a lithium-ion battery, comprising the negative pressure formation device described in any one of the above preferred technical solutions.

[0018] In a third aspect, the present invention provides a vehicle, comprising the negative pressure formation device or the lithium-ion battery described in any one of the above-mentioned preferred technical solutions.

[0019] In the preferred technical scheme of the negative pressure formation device of the present invention, the negative pressure formation device includes a probe assembly and a negative pressure suction assembly, the probe assembly is used to connect the pole of the lithium-ion battery; the negative pressure suction assembly includes a negative pressure suction nozzle and an operating part extending horizontally from the outer edge of the negative pressure suction nozzle, the operating part is detachably connected to the probe assembly, and the negative pressure suction nozzle is used to connect to the injection hole of the lithium-ion battery.

[0020] Compared with the technical solution of using coaxial needles or multi-needle probes for negative pressure formation in the prior art, the operating part of the present invention horizontally extends from the outer edge of the negative pressure suction nozzle, and the operating part is connected to the probe assembly in a detachable manner. During the connection of the probe assembly with the pole of the lithium ion battery, the negative pressure suction nozzle can be well connected to the injection hole of the large cylindrical lithium ion battery, and the probe assembly and the negative pressure suction assembly form an integrated structure. The integrated structure is more compact and can adapt to large cylindrical lithium ion batteries of various sizes with the injection hole in the center of the pole, which is convenient for negative pressure formation operation; and the operating part is also convenient for disassembling and installing the negative pressure suction nozzle, which simplifies the assembly process, makes the installation, debugging and replacement of the negative pressure formation device more convenient, and is also conducive to reducing production costs and improving production efficiency.

[0021] Furthermore, the probe assembly includes a current probe and a voltage probe respectively connected to the battery poles, the voltage probe is embedded in the current probe and can move relative to the current probe, thereby ensuring that the voltage probe can collect the voltage on the battery pole when the battery positioning deviates; the current probe is provided with an avoidance groove, and the operating part is installed in the avoidance groove to avoid the operating part, thereby preventing the operating part from affecting the contact between the current probe, the voltage probe and the battery pole, thereby ensuring that the current probe and the voltage probe can collect the current and voltage on the battery pole; it is also convenient for the installation and disassembly of the negative pressure nozzle and the current probe, and can also provide a nozzle extraction tool to clamp the negative pressure nozzle, so that the negative pressure nozzle can be smoothly pulled out from the negative pressure tube, and it is also convenient to install the negative pressure nozzle on the negative pressure tube.

[0022] Furthermore, the current probe is an annular structure, which is consistent with the pole structure of the cylindrical battery, ensuring that the current probe and the battery pole can fully contact, reducing the contact impedance between the current probe and the battery pole, and reducing the heat generated during the charging and discharging process. The negative pressure nozzle is located in the center of the annular structure, so that the negative pressure nozzle can adapt to the large cylindrical lithium-ion battery with the injection hole in the center of the pole, thereby effectively solving the negative pressure formation problem of the large cylindrical lithium-ion battery with the injection hole in the center of the pole.

[0023] Furthermore, there are multiple voltage probes, which are arranged around the circumference of the current probe, further ensuring that the voltage probe can collect the voltage on the battery pole when the battery positioning deviates.

[0024] Furthermore, the negative pressure formation device also includes a mounting assembly, and the probe assembly and the negative pressure suction assembly are both mounted on the mounting assembly, thereby improving the stability of the connection between the probe assembly, the negative pressure suction assembly and the battery pole.

[0025] Furthermore, the mounting assembly includes a mounting seat, a guide post, a terminal plate, a current probe terminal post and a voltage probe terminal post. The mounting seat is provided with a first through hole, the terminal plate is provided with a second through hole, the guide post passes through the first through hole and the second through hole in sequence, the first end of the guide post is respectively connected to the current probe and the voltage probe, the second end of the guide post is respectively connected to the current probe terminal post and the voltage probe terminal post, through the joint action of the first through hole and the second through hole, the guide post extends along the direction defined by the first through hole and the second through hole, so that the guide post is aligned with the end faces of the current probe terminal post and the voltage probe terminal post, and is aligned with the end faces of the current probe and the voltage probe, thereby helping to reduce the contact impedance of the current probe and the voltage probe with the end faces of the current probe terminal post and the voltage probe terminal post respectively, and prolonging the service life of the current probe and the voltage probe.

[0026] Furthermore, the installation assembly also includes a guide post guide sleeve arranged in the first through hole, the guide post guide sleeve is sleeved on the guide post, and there is a first preset gap between the guide post and the first guide post guide sleeve. Due to the difference in the levelness of the battery end face, the pole end face, and the bottom plane of the battery tray, there is a difference in the levelness of the battery pole end face. The first preset gap ensures that the end faces of the current probe and the voltage probe can adapt to the end faces of the battery pole, thereby reducing the contact impedance between the current probe and the voltage probe and the end faces of the battery pole, which is beneficial to extending the service life of the current probe and the voltage probe.

[0027] Furthermore, the negative pressure suction component also includes a negative pressure tube, a first end of the negative pressure tube is connected to the negative pressure suction nozzle, and a second end of the negative pressure tube is connected to an external negative pressure hose via a mounting base and a terminal block. The negative pressure tube can be used to draw negative pressure into the lithium-ion battery so as to extract the negative pressure gas inside the lithium-ion battery, thereby avoiding damage to the lithium-ion battery and ensuring the negative pressure formation effect of the lithium-ion battery.

[0028] Furthermore, a groove is provided at the top of the negative pressure suction nozzle; the negative pressure tube includes a tube body and a flange plate arranged on the outer wall of the tube body, and the second end of the tube body is connected to an external negative pressure hose through a mounting seat and a terminal plate; the first end of the tube body is inserted into the groove and fixedly connected to the negative pressure suction nozzle through the flange plate, so that the bottom of the flange plate fits with the top of the negative pressure suction nozzle, ensuring that the negative pressure suction nozzle is completely installed on the negative pressure tube, and the negative pressure suction nozzle can be smoothly pulled out of the negative pressure tube and installed on the negative pressure tube through the operating part, which facilitates the disassembly and installation of the negative pressure tube and the negative pressure suction nozzle.

[0029] Furthermore, the mounting assembly also includes a positioning nut and a spring, a third through hole is provided on the mounting seat, a fourth through hole is provided on the terminal plate, and the second end of the tube body passes through the third through hole and the fourth through hole in sequence, so that a part of the tube body is located above the terminal plate, thereby ensuring that the negative pressure hose can be connected to the tube body so as to draw negative pressure into the lithium-ion battery; in addition, the spring is sleeved on the tube body, the first end of the spring abuts against the flange, and the second end of the spring abuts against the mounting seat, and after adjusting the spring compression amount so that the lower end face of the positioning nut fits against the upper end face of the mounting seat, the tube body is fixedly connected to the mounting seat through the positioning nut, thereby preventing the tube body from rotating relative to the mounting seat and improving the stability of the connection between the tube body and the mounting seat; and the probe assembly and the negative pressure suction assembly share a set of springs, thereby simplifying the structure of the negative pressure formation device and facilitating installation, debugging and replacement.

[0030] Furthermore, the installation assembly also includes a negative pressure tube guide sleeve arranged in the third through hole, the negative pressure tube guide sleeve is arranged on the tube body, and there is a second preset gap between the tube body and the first negative pressure tube guide sleeve. The second preset gap ensures that the negative pressure suction nozzle can match the liquid injection hole and its surrounding end surface, so that the negative pressure suction nozzle can be effectively sealed with the liquid injection hole and its surrounding end surface.

[0031] Furthermore, a boss structure is provided at the bottom of the negative pressure nozzle, which matches the structure around the injection hole, and can effectively seal the gap between the negative pressure nozzle and the injection hole, ensuring the sealing during vacuum extraction; at the same time, the lithium-ion battery can be repositioned so that the current probe and the voltage probe can be well pressed on the pole.

[0032] Solution 1: A negative pressure formation device for a lithium ion battery, characterized in that the negative pressure formation device comprises a probe assembly and a negative pressure suction assembly, and the probe assembly is used to connect the pole of the lithium ion battery;

[0033] The negative pressure suction assembly includes a negative pressure suction nozzle and an operating portion extending horizontally from the outer edge of the negative pressure suction nozzle, the operating portion is detachably connected to the probe assembly, and the negative pressure suction nozzle is used to connect to the injection hole of the lithium-ion battery.

[0034] Solution 2: The negative pressure formation device according to Solution 1, characterized in that the probe assembly comprises a current probe and a voltage probe, the voltage probe is embedded in the current probe and can move relative to the current probe, and the current probe and the voltage probe are both connected to the pole;

[0035] The current probe is provided with an avoidance groove, and the operating part is installed in the avoidance groove.

[0036] Solution 3: The negative pressure formation device according to Solution 2, characterized in that the current probe is an annular structure, and the negative pressure nozzle is located at the center of the annular structure; and / or

[0037] There are multiple voltage probes, and the multiple voltage probes are arranged around the circumference of the current probe.

[0038] Solution 4: The negative pressure formation device according to Solution 2 is characterized in that the negative pressure formation device also includes a mounting assembly, and the probe assembly and the negative pressure suction assembly are both mounted on the mounting assembly.

[0039] Option 5. The negative pressure formation device according to Option 4 is characterized in that the mounting assembly includes a mounting seat, a guide post, a terminal plate, a current probe terminal post and a voltage probe terminal post, the mounting seat is provided with a first through hole, the terminal plate is provided with a second through hole, the guide post passes through the first through hole and the second through hole in sequence, the first end of the guide post is respectively connected to the current probe and the voltage probe, and the second end of the guide post is respectively connected to the current probe terminal post and the voltage probe terminal post.

[0040] Option 6. The negative pressure formation device according to Option 5 is characterized in that the mounting assembly also includes a guide post and a guide sleeve arranged in the first through hole, the guide post and guide sleeve are sleeved on the guide post, and a first preset gap is provided between the guide post and the guide post and guide sleeve.

[0041] Solution 7. The negative pressure formation device according to Solution 5 is characterized in that the negative pressure suction component also includes a negative pressure tube, a first end of the negative pressure tube is connected to the negative pressure suction nozzle, and a second end of the negative pressure tube is connected to an external negative pressure hose through the mounting base and the terminal board.

[0042] Solution 8: The negative pressure formation device according to Solution 7, characterized in that a groove is provided on the top of the negative pressure nozzle;

[0043] The negative pressure tube includes a tube body and a flange plate arranged on the outer wall of the tube body, the first end of the tube body is inserted into the groove and fixedly connected to the negative pressure suction nozzle through the flange plate, and the second end of the tube body is connected to an external negative pressure hose through the mounting seat and the terminal plate.

[0044] Solution 9. The negative pressure formation device according to Solution 8 is characterized in that the mounting assembly further comprises a positioning nut and a spring, the mounting seat is provided with a third through hole, the terminal plate is provided with a fourth through hole, the second end of the tube body passes through the third through hole and the fourth through hole in sequence, and the tube body is fixedly connected to the mounting seat through the positioning nut;

[0045] The spring is sleeved on the tube body, the first end of the spring abuts against the flange, and the second end of the spring abuts against the mounting seat.

[0046] Option 10, according to the negative pressure formation device of Option 9, is characterized in that the mounting assembly also includes a negative pressure tube guide sleeve arranged in the third through hole, the negative pressure tube guide sleeve is sleeved on the tube body, and a second preset gap is provided between the tube body and the negative pressure tube guide sleeve.

[0047] Scheme 11. A negative pressure formation device according to any one of schemes 1 to 10, characterized in that a boss structure is provided at the bottom of the negative pressure suction nozzle, and the boss structure can seal the gap between the negative pressure suction nozzle and the injection hole.

[0048] Option 12. A lithium-ion battery, characterized in that the lithium-ion battery includes the negative pressure formation device described in any one of Options 1 to 11.

[0049] Option 13. A vehicle, characterized in that the vehicle includes the negative pressure formation device described in any one of Options 1 to 11 or the lithium-ion battery described in Option 12. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The negative pressure forming device of the present invention is described below with reference to the accompanying drawings, in which:

[0051] Figure 1 is a bottom view of the negative pressure formation device of the present invention;

[0052] Figure 2 is a cross-sectional view of the negative pressure formation device of the present invention;

[0053] Figure 3 is a top view of a lithium-ion battery top cover of the present invention;

[0054] Figure 4 It is a cross-sectional view of the lithium ion battery top cover of the present invention.

[0055] Reference numerals list

[0056] 1. Probe assembly; 11. Current probe; 111. Avoidance groove; 12. Voltage probe;

[0057] 2. Negative pressure suction assembly; 21. Negative pressure suction nozzle; 211. Groove; 212. Boss structure; 22. Operating unit; 23. Negative pressure pipe; 231. Pipe body; 232. Flange;

[0058] 3. Mounting assembly; 31. Mounting seat; 311. Third through hole; 32. Guide column; 33. Terminal block; 331. Fourth through hole; 34. Current probe terminal; 35. Voltage probe terminal; 36. Positioning nut; 37. Spring; 38. Negative pressure tube guide sleeve; 4. Lithium-ion battery; 41. Pole; 411. Insulating layer; 42. Filling hole; 43. Step hole. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the present application is described in conjunction with an electric vehicle, the technical solution of the present invention is not limited thereto, and the negative pressure formation device can obviously also be applied to other vehicles such as hybrid electric vehicles, and such changes do not deviate from the principles and scope of the present invention.

[0060] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "bottom", "middle", "circumferential" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0061] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "setting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a direct connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Based on the technical problems raised in the background technology, the present invention provides a negative pressure formation device for a lithium ion battery, which is designed to have an operating part horizontally extending from the outer edge of a negative pressure suction nozzle, and the operating part is connected to a probe assembly in a detachable manner. During the connection of the probe assembly to the pole of the lithium ion battery, the negative pressure suction nozzle can be well connected to the injection hole of the large cylindrical lithium ion battery, and the probe assembly and the negative pressure suction assembly form an integrated structure, which is more compact and can adapt to large cylindrical lithium ion batteries of various sizes with the injection hole at the center of the pole, so as to facilitate negative pressure formation operation; and the operating part can also facilitate the disassembly and installation of the negative pressure suction nozzle, simplifying the assembly process, making the installation, debugging and replacement of the negative pressure formation device more convenient, and also conducive to reducing production costs and improving production efficiency.

[0063] See first Figures 1 to 4 , the negative pressure formation device of the present invention is described. Among them, Figure 1 is a bottom view of the negative pressure formation device of the present invention; Figure 2 is a cross-sectional view of the negative pressure formation device of the present invention; Figure 3 is a top view of a lithium-ion battery top cover of the present invention; Figure 4 It is a cross-sectional view of the lithium ion battery top cover of the present invention.

[0064] like Figures 1 to 4 As shown, the negative pressure formation device of the present invention comprises a probe assembly 1, a negative pressure suction assembly 2 and a mounting assembly 3, wherein the probe assembly 1 and the negative pressure suction assembly 2 are both mounted on the mounting assembly 3, and the probe assembly 1 is used to connect the pole 41 of the lithium ion battery 4; the negative pressure suction assembly 2 comprises a negative pressure suction nozzle 21 and a suction nozzle 21 extending from the outer edge (i.e. Figure 1 The operating part 22 extends horizontally (ie, extends in a direction parallel to the negative pressure suction nozzle 21) from the edge of the paper center away from the center of the paper, and the operating part 22 is detachably connected to the probe assembly 1, and the negative pressure suction nozzle 21 is used to connect to the injection hole 42 of the lithium-ion battery 4.

[0065] like Figure 4 As shown, an insulating layer 411 is provided on the outer wall of the pole 41 . For example, the insulating layer 411 can be made of insulating materials such as polytetrafluoroethylene, aluminum oxide, silicon dioxide, titanium dioxide, ceramics, etc.

[0066] It should be noted that, although the above embodiment is described in conjunction with the installation component 3, the above features are not essential, and those skilled in the art can understand that, under the premise of ensuring that the negative pressure formation device can operate normally, the above arrangement can be appropriately deleted to combine a new embodiment. For example, the installation component 3 can be deleted on the basis of the above embodiment to combine a new negative pressure formation device.

[0067] Refer to the following Figures 1 to 4 , the probe assembly of the present invention is described.

[0068] like Figure 1 Shown and combined Figure 4 The probe assembly 1 includes a current probe 11 and a voltage probe 12. Both the current probe 11 and the voltage probe 12 are connected to the pole 41. The voltage probe 12 is embedded in the current probe 11 and can move relative to the current probe 11. For example, the voltage probe 12 moves in a direction perpendicular to the current probe 11 (i.e. Figure 1 Of course, the voltage probe 12 can also move around the circumference of the current probe 11. No matter how it moves, it can be guaranteed that the voltage probe 12 can collect the voltage on the pole 41 when the battery positioning deviates.

[0069] like Figure 1 Shown and combined Figure 2 and Figure 4The current probe 11 is provided with an avoidance groove 111, and the operating part 22 is placed in the avoidance groove 111, which is convenient for the installation and removal of the negative pressure suction nozzle 21 and the current probe 11; and the avoidance groove 111 can avoid the operating part 22, thereby preventing the operating part 22 from affecting the contact between the current probe 11, the voltage probe 12 and the pole 41, ensuring that the current probe 11 and the voltage probe 12 can collect the current and voltage on the pole 41; it can also provide a suction nozzle extraction tool to clamp the negative pressure suction nozzle 21, and smoothly pull the suction nozzle out of the negative pressure tube 23, which is also convenient for installing the negative pressure suction nozzle 21 on the negative pressure tube 23. Of course, the installation method of the operating part 22 and the current probe 11 is not limited to the above-mentioned methods. The operating part 22 can also be snapped into the avoidance groove 111, or the operating part 22 can be fixed in the avoidance groove 111 by screws, or the operating part 22 can be magnetically attracted to the avoidance groove 111 by a magnetic strip; or, a connecting hole can be opened on the operating part 22, and the operating part 22 and the current probe 11 can be threadedly connected by connecting screws, or the operating part 22 and the current probe 11 can be detachably connected by other methods such as gluing.

[0070] Preferably, the number of the operating parts 22 is two, and the two operating parts 22 are evenly arranged around the circumference of the negative pressure suction nozzle 21, so that the two ends of the negative pressure suction nozzle 21 are evenly stressed, and the negative pressure suction nozzle 21 can be smoothly pulled out from the negative pressure tube 23, and it is also convenient to install the negative pressure suction nozzle 21 on the negative pressure tube 23. Of course, the number of the operating parts 22 is not limited to the number listed above, and one, three, four or more can be set, and all the operating parts 22 can be evenly or unevenly arranged around the circumference of the negative pressure suction nozzle 21.

[0071] like Figure 1 and Figure 3 As shown, the current probe 11 is a ring structure, which is consistent with the structure of the pole 41 of the cylindrical battery, ensuring that the current probe 11 and the pole 41 can fully contact each other, reducing the contact impedance between the current probe 11 and the pole 41, and reducing the heat generated during the charging and discharging process.

[0072] Furthermore, the negative pressure nozzle 21 is located in the central part of the annular structure, so that the negative pressure nozzle 21 can adapt to the large cylindrical lithium-ion battery 4 with the injection hole 42 at the center of the pole 41, thereby effectively solving the negative pressure formation problem of the large cylindrical lithium-ion battery 4 with the injection hole 42 at the center of the pole 41.

[0073] Furthermore, the two ends of the avoidance groove 111 are respectively connected to the outer edge and the inner edge (i.e. Figure 1 The edge toward the center of the paper) is connected so that a portion of the operating portion 22 can extend out of the avoidance groove 111 and be located outside the current probe 11, making it easier for the suction nozzle removal tool to clamp the negative pressure suction nozzle 21.

[0074] like Figure 1As shown, the number of voltage probes 12 is four, and the four voltage probes 12 are arranged in a rectangular array inside the current probe 11, further ensuring that the voltage probes 12 can collect the voltage on the pole 41 when the battery positioning is deviated. Of course, the number of voltage probes 12 is not limited to the number listed above, and two, three, five or more can be set, and all voltage probes 12 can be arranged around the circumference of the voltage probe 12 in a preset manner, such as symmetrical arrangement, uniform arrangement, non-uniform arrangement, etc.

[0075] Refer to the following Figure 1 , Figure 2 and Figure 4 , the negative pressure suction component of the present invention is described.

[0076] like Figure 1 and Figure 2 As shown, the negative pressure suction assembly 2 also includes a negative pressure tube 23, the first end of the negative pressure tube 23 (i.e. Figure 2 The end below the middle paper surface) is connected to the negative pressure nozzle 21, and the second end of the negative pressure tube 23 (i.e. Figure 2 The end above the middle paper surface) is connected to an external negative pressure hose (not shown in the figure) through the installation component 3, and the negative pressure tube 23 can be used to draw negative pressure into the interior of the lithium ion battery 4 so as to extract the formed gas inside the lithium ion battery 4, thereby avoiding damage to the lithium ion battery 4 and ensuring the negative pressure formation effect of the lithium ion battery 4.

[0077] Preferably, the negative pressure pipe 23 includes a pipe body 231 and a flange 232 disposed on the outer wall of the pipe body 231; the top of the negative pressure nozzle 21 (i.e. Figure 2 The portion above the middle paper surface) is provided with a groove 211, and the first end of the tube body 231 (i.e. Figure 2 The end of the tube body 231 (below the middle paper surface) is inserted into the groove 211, so that the bottom of the flange 232 fits with the top of the negative pressure nozzle 21, and is fixedly connected to the negative pressure nozzle 21 through the flange 232, ensuring that the negative pressure nozzle 21 is completely installed on the negative pressure tube 23; moreover, the negative pressure nozzle 21 can be smoothly pulled out of the negative pressure tube 23 and installed on the negative pressure tube 23 through the operating part 22, which facilitates the disassembly and installation of the negative pressure tube 23 and the negative pressure nozzle 21. The second end of the tube body 231 is connected to the external negative pressure hose through the mounting assembly 3, so as to draw negative pressure into the lithium-ion battery 4.

[0078] Of course, the negative pressure tube structure is not limited to the structures listed above. The negative pressure tube may also include a tube body and a positioning block arranged on the outer wall of the tube body. A positioning groove is provided on the top of the negative pressure suction nozzle. When the first end of the tube body is inserted into the groove, the positioning pin is stuck in the positioning block, thereby fixing the negative pressure suction nozzle to the negative pressure tube; or, the negative pressure tube may also include a tube body and a connecting piece arranged on the outer wall of the tube body. A connecting hole is provided on the connecting piece. When the first end of the tube body is inserted into the groove, the connecting piece fits with the top of the negative pressure suction nozzle. The connecting screw passes through the connecting hole to thread the negative pressure suction nozzle to the negative pressure tube. No matter what kind of negative pressure tube structure is adopted, as long as it can be connected and fixed to the negative pressure suction nozzle, it will be fine.

[0079] like Figure 2 and Figure 4 As shown, the bottom of the negative pressure nozzle 21 (i.e. Figure 2 The end below the middle paper surface) is provided with a boss structure 212, and the top of the injection hole 42 (i.e. Figure 4 A stepped hole 43 is provided in the middle of the paper (above the center paper), and the boss structure 212 is consistent with the stepped hole 43 structure at the top of the injection hole 42, which can effectively seal the gap between the negative pressure suction nozzle 21 and the injection hole 42, ensuring the sealing during vacuuming; at the same time, the lithium-ion battery 4 can be repositioned so that the current probe 11 and the voltage probe 12 can be well pressed on the pole 41.

[0080] Refer to the following Figure 2 and Figure 4 , the installation components of the present invention are described.

[0081] like Figure 2 As shown, the mounting assembly 3 includes a mounting seat 31, a guide post 32, a terminal plate 33, a current probe terminal post 34 and a voltage probe terminal post 35. The mounting seat 31 is provided with a first through hole (not shown in the figure), and the terminal plate 33 is provided with a second through hole (not shown in the figure). The guide post 32 passes through the first through hole and the second through hole in sequence. The first end of the guide post 32 is respectively connected to the current probe 11 and the voltage probe 12, and the second end of the guide post 32 is respectively connected to the current probe terminal post 34 and the voltage probe terminal post 35. Through the combined action of the first through hole and the second through hole, the guide post 32 extends along the direction defined by the first through hole and the second through hole, so that the guide post 32 is aligned with the end faces of the current probe terminal post 34 and the voltage probe terminal post 35, and is also aligned with the end faces of the current probe 11 and the voltage probe 12, which is beneficial to reduce the contact impedance of the current probe 11 and the voltage probe 12 with the end faces of the current probe terminal post 34 and the voltage probe terminal post 35, respectively, and prolong the service life of the current probe 11 and the voltage probe 12.

[0082] like Figure 2 Shown and combined Figure 4The mounting assembly 3 also includes a guide post and a guide sleeve (not shown in the figure) arranged in the first through hole. The guide post and the guide sleeve are sleeved on the guide post 32, and there is a first preset gap between the guide post 32 and the guide post and the guide sleeve. Due to the difference in the levelness of the battery end face, the end face of the pole 41, and the bottom plane of the battery tray, there is a difference in the levelness of the end face of the pole 41. The first preset gap ensures that the end faces of the current probe 11 and the voltage probe 12 can adapt to the end face of the pole 41, thereby reducing the contact impedance between the current probe 11 and the voltage probe 12 and the end face of the pole 41, which is beneficial to extending the service life of the current probe 11 and the voltage probe 12.

[0083] Preferably, the number of the guide posts 32 is two, and the two guide posts 32 are evenly arranged around the circumference of the mounting seat 31, so that both ends of the current probe 11 and the voltage probe 12 can be connected to the current probe terminal 34 and the voltage probe terminal 35, further ensuring that the current probe 11 can collect the current on the pole 41, and the voltage probe 12 can collect the voltage on the pole 41. Of course, the number of the guide posts 32 is not limited to the number listed above, and one, three, four or more can be set, and all the guide posts 32 can be evenly or unevenly arranged around the circumference of the mounting seat 31.

[0084] like Figure 2 Shown and combined Figure 4 The mounting assembly 3 also includes a positioning nut 36 and a spring 37. A third through hole 311 is provided on the mounting seat 31, and a fourth through hole 331 is provided on the terminal plate 33. The second end of the tube body 231 passes through the third through hole 311 and the fourth through hole 331 in sequence. Through the joint action of the third through hole 311 and the fourth through hole 331, the tube body 231 extends along the direction defined by the third through hole 311 and the fourth through hole 331, and a part of the tube body 231 is located above the terminal plate 33, ensuring that the negative pressure hose can be connected to the tube body 231 so as to draw negative pressure into the lithium-ion battery 4.

[0085] Furthermore, the spring 37 is sleeved on the tube body 231, and the first end (i.e. Figure 2 The end below the middle paper surface) abuts against the flange 232, and the second end of the spring 37 (i.e. Figure 2 The tube body 231 is fixedly connected to the mounting seat 31 through the positioning nut 36, thereby preventing the tube body 231 from rotating relative to the mounting seat 31 and improving the stability of the connection between the tube body 231 and the mounting seat 31; and the probe assembly 1 and the negative pressure suction assembly 2 share a set of springs 37, which simplifies the structure of the negative pressure formation device and facilitates installation, debugging and replacement.

[0086] Furthermore, the mounting assembly 3 also includes a negative pressure tube guide sleeve 38 disposed in the third through hole 311, the negative pressure tube guide sleeve 38 is sleeved on the tube body 231, and a second preset gap is provided between the tube body 231 and the negative pressure tube guide sleeve 38. The second preset gap ensures that the negative pressure suction nozzle 21 can match the injection hole 42 and its peripheral end faces, so that the negative pressure suction nozzle 21 can be effectively sealed with the injection hole 42 and its peripheral end faces.

[0087] Of course, the positioning structure is not limited to the structures listed above. The positioning structure can also be a positioning pin set on the mounting seat and a positioning hole set on the outer wall of the tube body. After adjusting the spring compression, the positioning pin is inserted into the positioning hole to fix the tube body and the mounting seat; or, the positioning structure can also be a positioning groove set on the outer wall of the tube body and a positioning lock set on the mounting seat. The positioning lock includes a lock body and a lock tongue and a driving motor set in the lock body. After adjusting the spring compression, the driving motor drives the lock tongue to extend from the lock body and insert it into the positioning groove to fix the tube body and the mounting seat. No matter what positioning structure is adopted, as long as the tube body and the mounting seat can be fixed.

[0088] The following figure Figures 1 to 4 , the method of using the positive electrode negative pressure formation device of the present invention is described.

[0089] like Figures 1 to 4 As shown, during the negative pressure formation process, the bottom of the negative pressure nozzle 21 is connected to the injection hole 42, so that the boss structure 212 at the bottom of the negative pressure nozzle 21 coincides with the structure around the injection hole 42, thereby effectively sealing the gap between the negative pressure nozzle 21 and the injection hole 42. At the same time, the current probe 11 and the voltage probe 12 are both connected to the pole 41, ensuring that the current and voltage on the pole 41 can be collected; and the tube body 231 is connected to the negative pressure hose to pump negative pressure inside the lithium ion battery 4 to extract the formed gas inside the lithium ion battery 4. Moreover, the negative pressure nozzle 21 is located in the center of the current probe 11, so that the negative pressure nozzle 21 can adapt to the large cylindrical lithium ion battery 4 with the injection hole 42 at the center of the pole 41, thereby effectively solving the negative pressure formation problem of the large cylindrical lithium ion battery 4 with the injection hole 42 at the center of the pole 41.

[0090] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims of the present invention, any one of the claimed embodiments may be used in any combination.

[0091] In addition, the present invention also provides a lithium-ion battery, which includes the negative pressure formation device of any one of the above embodiments.

[0092] In addition, the present invention also provides an electric vehicle, which includes the negative pressure formation device or the lithium ion battery according to any one of the above embodiments.

[0093] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A negative pressure formation device for lithium ion batteries, characterized in that: The negative pressure formation device comprises a probe assembly and a negative pressure suction assembly, wherein the probe assembly is used to connect the pole of the lithium ion battery; The negative pressure suction assembly includes a negative pressure suction nozzle and an operating portion horizontally extending from the outer edge of the negative pressure suction nozzle, the operating portion is detachably connected to the probe assembly, and the negative pressure suction nozzle is used to communicate with the injection hole of the lithium ion battery; Wherein, the probe assembly comprises a current probe and a voltage probe, the voltage probe is embedded in the current probe and can move relative to the current probe, and the current probe and the voltage probe are both connected to the pole; The current probe is provided with an avoidance groove, and the operating part is installed in the avoidance groove.

2. The negative pressure formation device according to claim 1, characterized in that: The current probe is an annular structure, and the negative pressure nozzle is located at the center of the annular structure; and / or There are multiple voltage probes, and the multiple voltage probes are arranged around the circumference of the current probe.

3. The negative pressure formation device according to claim 1, characterized in that: The negative pressure formation device also includes a mounting assembly, and the probe assembly and the negative pressure suction assembly are both mounted on the mounting assembly.

4. The negative pressure formation device according to claim 3, characterized in that: The mounting assembly includes a mounting base, a guide post, a terminal plate, a current probe terminal post and a voltage probe terminal post. The mounting base is provided with a first through hole, the terminal plate is provided with a second through hole, the guide post passes through the first through hole and the second through hole in sequence, the first end of the guide post is respectively connected to the current probe and the voltage probe, and the second end of the guide post is respectively connected to the current probe terminal post and the voltage probe terminal post.

5. The negative pressure formation device according to claim 4, characterized in that: The installation assembly also includes a guide post and a guide sleeve disposed in the first through hole. The guide post and the guide sleeve are sleeved on the guide post, and a first preset gap is formed between the guide post and the guide post and the guide sleeve.

6. The negative pressure formation device according to claim 4, characterized in that: The negative pressure suction component also includes a negative pressure tube, a first end of the negative pressure tube is connected to the negative pressure suction nozzle, and a second end of the negative pressure tube is connected to an external negative pressure hose through the mounting seat and the terminal board.

7. The negative pressure formation device according to claim 6, characterized in that: A groove is provided on the top of the negative pressure nozzle; The negative pressure tube includes a tube body and a flange plate arranged on the outer wall of the tube body, the first end of the tube body is inserted into the groove and fixedly connected to the negative pressure suction nozzle through the flange plate, and the second end of the tube body is connected to an external negative pressure hose through the mounting seat and the terminal plate.

8. The negative pressure formation device according to claim 7, characterized in that: The mounting assembly further includes a positioning nut and a spring, the mounting seat is provided with a third through hole, the terminal plate is provided with a fourth through hole, the second end of the tube body passes through the third through hole and the fourth through hole in sequence, and the tube body is fixedly connected to the mounting seat through the positioning nut; The spring is sleeved on the tube body, the first end of the spring abuts against the flange, and the second end of the spring abuts against the mounting seat.

9. The negative pressure formation device according to claim 8, characterized in that: The mounting assembly further includes a negative pressure tube guide sleeve disposed in the third through hole. The negative pressure tube guide sleeve is sleeved on the tube body, and a second preset gap is provided between the tube body and the negative pressure tube guide sleeve.

10. The negative pressure formation device according to any one of claims 1 to 9, characterized in that: A boss structure is provided at the bottom of the negative pressure suction nozzle, and the boss structure can seal the gap between the negative pressure suction nozzle and the liquid injection hole.

11. A lithium ion battery, characterized in that: The lithium-ion battery comprises the negative pressure formation device according to any one of claims 1 to 10.

12. A vehicle, characterized in that: The vehicle comprises the negative pressure formation device according to any one of claims 1 to 10 or the lithium ion battery according to claim 11.

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