Probe device and battery production system

Abstract

The embodiment of the utility model provides a probe device and a battery production system, the probe device comprises a mounting seat, a first probe, a wiring assembly and a first elastic member, the mounting seat is used for connecting a target object, and the mounting seat is provided with a first cavity penetrating the mounting seat along a first direction; the first probe comprises a probe rod and a probe head, the probe rod is arranged in the first cavity in a penetrating manner, two opposite ends of the probe rod extend out of the first cavity, the probe head is fixed at one end of the probe rod and is used for abutting against a pole of the single battery, and the probe head and the probe rod are two split parts and are electrically connected; the wiring assembly is located on the side, away from the probe head, of the mounting base, sleeves and is fixed to the probe rod, and the wiring assembly is used for being electrically connected with external equipment and transmitting current between the external equipment and the probe rod; the first elastic piece is arranged on the probe rod in a sleeving mode, and the first elastic piece is configured to be capable of being extruded by the installation base and the probe head and limiting the probe head outside the first cavity. The maintenance cost of the probe device can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly, to a probe device and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the process of preparing batteries, a probe device is usually used to perform processes such as formation on battery cells. How to reduce the maintenance cost of the probe device is a research direction in battery technology. Utility Model Content

[0004] The present application provides a probe device and a battery production system, which can reduce the maintenance cost of the probe device.

[0005] An embodiment of the present application provides a probe device, including a mounting seat, a first probe, a wiring assembly and a first elastic member. The mounting seat is used to connect to a target object, and the mounting seat has a first cavity that runs through the mounting seat along a first direction; the first probe includes a probe rod and a probe head, the probe rod is passed through the first cavity, and both opposite ends extend out of the first cavity, the probe head is fixed to one end of the probe rod, and is used to press against the pole of a battery cell, the probe head and the probe rod are two separate components and are electrically connected; the wiring assembly is located on a side of the mounting seat away from the probe head, the wiring assembly is sleeved and fixed on the probe rod, the wiring assembly is used to be electrically connected to an external device, and transmit current between the external device and the probe rod; the first elastic member is sleeved on the probe rod, and the first elastic member is configured to be squeezed by the mounting seat and the probe head, and to limit the probe head outside the first cavity.

[0006] In the above technical scheme, the probe device of the embodiment of the present application divides the probe rod and the probe head into two separate parts, so that after the probe head is worn and fails, the probe head can be removed from the probe rod and only the probe head needs to be replaced without replacing the probe rod, thereby reducing the maintenance cost of the probe device.

[0007] In some embodiments, the probe head is provided with a recess, which is recessed from the surface of the probe head facing the mounting seat to the side away from the mounting seat, and one end of the probe rod extends into the recess and is connected to the side wall and the bottom wall of the recess.

[0008] In the above technical solution, a recess is provided on the probe head, and the probe rod is inserted into the recess and fixed to the probe head, which can increase the connection area between the probe rod and the probe head and improve the tightness of the connection between the probe rod and the probe head.

[0009] In some embodiments, the probe head is provided with a groove, which is recessed inward from the outer circumference of the probe head and extends along the circumference of the probe head to at least a portion of the outer circumference, and the groove is used to cooperate with a tool for separating the probe head and the probe rod.

[0010] In the above technical solution, a groove is provided on the probe head to facilitate the use with a tool for separating the probe head from the probe rod, thereby facilitating the removal of the probe head from the probe rod.

[0011] In some embodiments, the mounting seat includes an annular side wall and a connecting plate arranged on at least a portion of the outer circumference of the annular side wall, the inner surface of the annular side wall is arranged to form a first cavity, the connecting plate is used to connect to the target object, and the inner surface of the annular side wall includes a first sub-surface, a second sub-surface and a third sub-surface connected at an angle in sequence, the first sub-surface and the third sub-surface face the probe rod, the second sub-surface faces the probe head, and one end of the first elastic member abuts against the second sub-surface.

[0012] In the above technical solution, one end of the first elastic member is abutted against the second sub-surface, which can shorten the length of the first elastic member and reduce the cost compared to abutting against the limiting wall.

[0013] In some embodiments, the number of the first elastic member is one.

[0014] In the above technical solution, the number of the first elastic member is set to one, which is easier to control the compression amount of the first elastic member than setting a plurality of first elastic members.

[0015] In some embodiments, the connecting plate is embedded with a connecting nut, and the connecting nut is used to connect to the target object.

[0016] In the above technical solution, the connecting nut is embedded in the connecting plate, which can make the thread have higher precision and save the process of making the thread on the connecting plate. In addition, after the connecting nut is worn and fails, the connecting nut can be replaced without replacing the connecting plate, which saves costs.

[0017] In some embodiments, the wiring assembly includes a first nut, a wiring terminal, and a second nut which are sequentially sleeved on the outside of the probe rod. The first nut and the second nut are threadedly engaged with the probe rod. The wiring terminal is clamped between the first nut and the second nut and is used to electrically connect to an external device.

[0018] In the above technical solution, the first nut and the second nut are used to cooperate with the probe rod thread to fix the terminal on the probe rod. The threaded connection is convenient for installation and disassembly, and the position of the terminal can be adjusted. Moreover, the degree of tightening between the first nut and the second nut and the terminal is adjustable, so that the first nut, the second nut and the terminal can be tightly connected, so that the terminal is firmly fixed on the probe rod, thereby reducing the occurrence of conductive failure due to poor contact.

[0019] In some embodiments, the probe device also includes a sampling needle, the probe rod has a second cavity extending through itself along a first direction, the probe head has a third cavity extending through itself along the first direction, the second cavity and the third cavity are connected, the sampling needle is inserted into the second cavity and the third cavity, and is used to abut against the pole of the battery cell to collect the voltage of the battery cell.

[0020] In the above technical solution, a sampling needle is arranged inside the probe rod, which can increase the function of the probe device, that is, the voltage of the battery cell can be monitored while realizing the charging and discharging of the battery cell.

[0021] In some embodiments, the third cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity is located on a side of the second sub-cavity close to the mounting seat, the maximum dimension of the second sub-cavity along the second direction is greater than the maximum dimension of the first sub-cavity along the second direction, the second direction is perpendicular to the first direction, the sampling needle includes a sampling needle rod and a sampling needle head arranged at one end of the sampling needle rod, the sampling needle head is located in the second sub-cavity, and is configured to be able to move in the direction from the sampling needle head to the sampling needle rod, and is limited to the bottom surface of the second sub-cavity.

[0022] In the above technical solution, since the sampling needle is movable, the position of the sampling needle relative to the first probe can be adjusted, which can increase the applicable range of the sampling needle, that is, it can also be applicable to uneven poles.

[0023] In some embodiments, the probe device further includes an insulating sleeve, which is disposed on the sampling needle and electrically isolates the sampling needle from the first probe.

[0024] In the above technical solution, the sampling needle and the first probe are electrically isolated by using an insulating sleeve, and the insulating sleeve has a good insulation effect and is also convenient to install.

[0025] In some embodiments, the insulating sleeve is disposed on the sampling needle and the portion of the sampling needle rod close to the sampling needle.

[0026] In the above technical solution, the amount of the insulating sleeve can be reduced and the material cost can be reduced while the insulation effect of the sampling needle and the first probe is met.

[0027] In some embodiments, the surface of the probe rod facing the second cavity includes a fourth sub-surface, a fifth sub-surface and a sixth sub-surface connected at an angle in sequence, the fourth sub-surface and the sixth sub-surface face the sampling needle rod, the fifth sub-surface faces the sampling needle head, the insulating sleeve is located on the side of the fifth sub-surface facing the sampling needle head and is spaced apart from the fifth sub-surface, the probe device also includes a second elastic member, one of the two opposite ends of the second elastic member abuts against the part of the sampling needle rod where the insulating sleeve is arranged, and the other end abuts against the fifth sub-surface; the sampling needle has a first state and a second state, in the first state, the sampling needle head protrudes from the end of the probe head away from the probe rod; in the second state, the second elastic member is squeezed by the insulating sleeve and the fifth sub-surface.

[0028] In the above technical solution, a second elastic member is provided, and the second elastic member is in a compressed state when the voltage is detected, which improves the tightness of the abutment between the sampling needle and the pole of the battery cell, thereby improving the reliability of the use of the sampling needle.

[0029] In some embodiments, the sampling needle protrudes from one end of the probe rod away from the probe head, and the probe device further comprises an insulating sleeve, which is sleeved on the portion of the sampling needle protruding from the probe rod and clamped on the surface of the probe rod away from the probe head.

[0030] In the above technical solution, an insulating sleeve is provided, and the sampling needle is restricted on the probe rod by the insulating sleeve, which can prevent the sampling needle from slipping out of the first probe and improve the convenience of using the probe device.

[0031] In some embodiments, the sampling needle is provided with a first through hole, the insulating sleeve is provided with a second through hole penetrating the insulating sleeve, and the probe device further comprises a bayonet pin which passes through the first through hole and the second through hole and connects the sampling needle and the insulating sleeve together.

[0032] In the above technical solution, the insulating sleeve and the sampling needle are connected together by a bayonet pin, which facilitates the disassembly of the insulating sleeve and the sampling needle.

[0033] In a second aspect, an embodiment of the present application further provides a battery production system, comprising the above-mentioned probe device, which is used to perform charging and discharging operations on battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a battery production system provided in some embodiments of the present application;

[0036] Figure 2 A schematic diagram of the structure of a probe device provided in some embodiments of the present application;

[0037] Figure 3 for Figure 2 The schematic diagram of the structure of the probe device shown in another angle;

[0038] Figure 4 for Figure 3 Sectional view at AA;

[0039] Figure 5 for Figure 4 A schematic diagram of a probe head of the probe device shown;

[0040] Figure 6 for Figure 3 Enlarged view at B.

[0041] The reference numerals of the embodiments are as follows:

[0042] 100. Battery production system; 200. Probe device; 300. Pole production equipment; 400. Packaging equipment;

[0043] 1. Mounting seat; 11. First cavity; 12. Annular side wall; 121. First sub-surface; 122. Second sub-surface; 123. Third sub-surface; 13. Connecting plate; 14. Connecting nut;

[0044] 2. The first probe;

[0045] 21, probe rod; 211, second cavity; 212, fourth sub-surface; 213, fifth sub-surface; 214, sixth sub-surface;

[0046] 22, probe head; 221, recess; 222, side wall; 223, bottom wall; 224, groove; 225, third cavity; 2251, first sub-cavity; 2252, second sub-cavity; 2253, bottom surface;

[0047] 3. Wiring assembly; 31. First nut; 32. Wiring terminal; 33. Second nut; 34. First gasket;

[0048] 4. a first elastic member;

[0049] 5. sampling needle; 51. sampling needle rod; 511. first through hole; 52. sampling needle head;

[0050] 6. Insulation sleeve;

[0051] 7. A second elastic member;

[0052] 8. Insulating sleeve; 81. Second through hole;

[0053] 9. Lock pin;

[0054] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0057] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0060] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0061] The term "plurality" used in the present application refers to two or more (including two).

[0062] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0063] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0064] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0065] After the initial production of the battery cells is completed, a probe device is usually used to perform formation and other processes on the battery cells. Formation refers to the first charge and discharge cycle of the battery cells after the electrolyte is injected. Its main purpose is to activate the active substances in the battery cells.

[0066] The probe device generally includes an integrally formed probe head and a probe rod. The probe head needs to be squeezed into contact with the pole of the battery cell. Therefore, after long-term use, the probe head will wear and become passivated, leading to failure. After the probe device fails, both the probe rod and the probe head need to be replaced, and the maintenance cost is high.

[0067] In view of this, the present application provides a probe device, which forms and connects a probe rod and a probe head of the probe device separately, so that when the probe head is worn, only the probe head needs to be replaced without replacing the probe rod, thereby reducing the maintenance cost of the probe device.

[0068] The probe device described in the embodiment of the present application is suitable for a battery production system.

[0069] Figure 1 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0070] like Figure 1 As shown, the battery production system 100 includes a probe device 200, and the probe device 200 is used to perform charging and discharging operations on battery cells.

[0071] The battery production system 100 of the embodiment of the present application may also include a pole piece production device 300, which is located upstream of the probe device 200. The pole piece production device 300 includes a slurry making mechanism, a coating mechanism and a drying mechanism. The slurry making mechanism is used to mix active materials, adhesives and conductive agents to prepare slurry. The coating mechanism is used to coat the slurry on the current collector. The drying mechanism is used to dry the current collector coated with the slurry to form a dry pole piece.

[0072] The battery production system 100 of the embodiment of the present application may further include a packaging device 400, which is located downstream of the pole piece production device 300 and upstream of the probe device 200. The packaging device 400 is used to load the battery cell into the housing and install the end cap on the housing.

[0073] Figure 2 A schematic diagram of the structure of a probe device provided in some embodiments of the present application; Figure 3 for Figure 2 The schematic diagram of the structure of the probe device shown in another angle; Figure 4 for Figure 3 Section view at AA.

[0074] like Figure 2-Figure 4As shown, the probe device 200 includes a mounting seat 1, a first probe 2, a wiring assembly 3 and a first elastic member 4. The mounting seat 1 is used to connect the target object, and the mounting seat 1 has a first cavity 11 that passes through itself along the first direction X; the first probe 2 includes a probe rod 21 and a probe head 22, the probe rod 21 is inserted into the first cavity 11, and both opposite ends extend out of the first cavity 11, the probe head 22 is fixed to one end of the probe rod 21, and is used to press against the pole of the battery cell, the probe head 22 and the probe rod 21 are two separate parts and are electrically connected; the wiring assembly 3 is located on the side of the mounting seat 1 away from the probe head 22, the wiring assembly 3 is sleeved and fixed on the probe rod 21, the wiring assembly 3 is used to be electrically connected to an external device, and transmit current between the external device and the probe rod 21; the first elastic member 4 is sleeved on the probe rod 21, and the first elastic member 4 is configured to be squeezed by the mounting seat 1 and the probe head 22, and to limit the probe head 22 outside the first cavity 11.

[0075] The mounting base 1 of the embodiment of the present application can be connected to the target object by thread connection, plug-in fitting or clamping, etc. The mounting base 1 is made of insulating material.

[0076] The probe head 22 and the probe rod 21 of the embodiment of the present application are two separate components, which means that the probe head 22 and the probe rod 21 are not integrally formed, but are two separately formed components connected together by other connection means.

[0077] The probe head 22 of the embodiment of the present application is fixed to one end of the probe rod 21, and the two can be connected by at least one of riveting, welding and threaded connection. Exemplarily, the surface of the probe head 22 facing the probe rod 21 can be a plane, and the surface of the probe rod 21 facing the probe head 22 can also be a plane, and the two contacting planes are connected by welding. In another exemplary embodiment, a protrusion can be provided on the surface of the probe head 22 facing the probe rod 21, and the probe rod 21 is welded to the probe head 22 through the protrusion.

[0078] The probe head 22 and the probe rod 21 of the embodiment of the present application both include conductive materials to achieve electrical connection.

[0079] The wiring assembly 3 of the embodiment of the present application can directly abut against the side of the mounting base 1 facing away from the probe head 22, and other components can also be arranged between the two.

[0080] The wiring assembly 3 of the embodiment of the present application is fixed to the probe rod 21. Exemplarily, the wiring assembly 3 can be connected to the probe rod 21 by a snap-on method. For example, the wiring assembly 3 is provided with a snap buckle, and the probe rod 21 is provided with a slot, and the two are mutually snapped to realize that the wiring assembly 3 is fixed to the probe rod 21. The wiring assembly 3 can also be connected and fixed to the probe rod 21 by bonding. The wiring assembly 3 is located on the side of the mounting seat 1 away from the probe head 22, and is fixed to the probe head 22, so that the first probe 2 can be limited to the mounting seat 1 to prevent it from falling.

[0081] The wiring assembly 3 of the embodiment of the present application is electrically connected to an external device so that the current flows from the wiring assembly 3 to the probe rod 21 and then to the probe head 22 to realize the charging of the battery cell; the current can also be conducted from the pole to the probe head 22 and then to the probe rod 21 to realize the discharge of the battery cell.

[0082] The probe head 22 of the embodiment of the present application is in contact with the pole of the battery cell, and the probe head 22 performs charging and discharging operations on the battery cell to realize the formation, capacity division and other processes of the battery cell. Among them, the surface of the probe head 22 away from the probe rod 21 is pressed against the pole of the battery cell. Exemplarily, the surface of the probe head 22 away from the probe rod 21 is provided with a conical current detection tip, and the current detection tip is used to pierce the oxide layer of the pole.

[0083] The first elastic member 4 in the embodiment of the present application may be a compression spring, or a rubber ring or the like.

[0084] The two opposite ends of the first elastic member 4 of the embodiment of the present application abut against the mounting seat 1 and the probe head 22 respectively, wherein the end of the first elastic member 4 abutting against the mounting seat 1 may abut against the surface of the mounting seat 1 facing the probe head 22, may abut against the wall of the mounting seat 1 away from the probe head 22, or may abut against other positions of the mounting seat 1. The first elastic member 4 may abut against the surface of the probe head 22 facing the mounting seat 1.

[0085] The probe head 22 of the embodiment of the present application is always located outside the first cavity 11 , and the cross-sectional dimension of the probe head 22 is larger than the cross-sectional dimension of the probe rod 21 , so that the first elastic member 4 can press against the protruding portion of the probe head 22 relative to the probe rod 21 .

[0086] The probe rod 21 and the probe head 22 of the embodiment of the present application may both be solid structures without any other cavity inside.

[0087] When the probe device 200 of the embodiment of the present application is in use, the probe head 22 is pressed against the pole of the battery cell, and the probe head 22 moves toward the mounting seat 1 to squeeze the first elastic member 4. Under the elastic force of the first elastic member 4, the probe head 22 is in close contact with the pole to realize the charging and discharging of the battery cell.

[0088] The probe device 200 of the embodiment of the present application divides the probe rod 21 and the probe head 22 into two separate components. Therefore, after the probe head 22 wears out and fails, the probe head 22 can be removed from the probe rod 21. Only the probe head 22 needs to be replaced without replacing the probe rod 21, thereby reducing the maintenance cost of the probe device 200.

[0089] Figure 5 for Figure 4 A schematic diagram of the probe head of the probe apparatus is shown.

[0090] See also Figure 5 In some embodiments, the probe head 22 is provided with a recess 221, which is recessed from the surface of the probe head 22 facing the mounting seat 1 to the side away from the mounting seat 1, and one end of the probe rod 21 extends into the recess 221 and is connected to the side wall 222 of the recess 221 and the bottom wall 223 of the recess 221.

[0091] The bottom wall of the recess 221 in the embodiment of the present application faces the opening of the recess 221 , and the opening is used for the probe rod 21 to extend into.

[0092] The probe rod 21 of the embodiment of the present application can be connected to the side wall 222 of the recess 221 by welding or bonding; the probe rod 21 can be connected to the bottom wall 223 of the recess 221 by welding or bonding.

[0093] A recess 221 is provided on the probe head 22 , and the probe rod 21 extends into the recess 221 and is fixed to the probe head 22 , which can increase the connection area between the probe rod 21 and the probe head 22 and improve the tightness of the connection between the probe rod 21 and the probe head 22 .

[0094] In some embodiments, the probe head 22 is provided with a groove 224 , which is recessed inward from the outer circumference of the probe head 22 and extends along the circumference of the probe head 22 to at least a portion of the outer circumference. The groove 224 is used to cooperate with a tool for separating the probe head 22 and the probe rod 21 .

[0095] Optionally, the groove 224 extends along the circumference of the probe head 22 to the entire outer circumference.

[0096] The number of the groove 224 in the embodiment of the present application may be one or more. When the number of the groove 224 is more than one, the plurality of grooves 224 may be arranged at intervals along the arrangement direction from the probe rod 21 to the probe head 22 .

[0097] A groove 224 is provided on the probe head 22 to facilitate the use with a tool for separating the probe head 22 from the probe rod 21 , thereby facilitating the removal of the probe head 22 from the probe rod 21 .

[0098] Please continue reading Figure 4In some embodiments, the mounting seat 1 includes an annular side wall 12 and a connecting plate 13 arranged on at least part of the outer peripheral side of the annular side wall 12. The inner surface of the annular side wall 12 encloses a first cavity 11. The connecting plate 13 is used to connect to the target object. The inner surface of the annular side wall 12 includes a first sub-surface 121, a second sub-surface 122 and a third sub-surface 123 connected at an angle in sequence. The first sub-surface 121 and the third sub-surface 123 face the probe rod 21, the second sub-surface 122 faces the probe head 22, and one end of the first elastic member 4 abuts against the second sub-surface 122.

[0099] The mounting base 1 in the embodiment of the present application is made of non-metallic insulating material, for example, plastic.

[0100] The connection plate 13 of the embodiment of the present application is used to connect with the target object. For example, a threaded inner hole can be provided on the connection plate 13, and a threaded connection with the target object is achieved through the threaded inner hole.

[0101] The first sub-surface 121, the second sub-surface 122 and the third sub-surface 123 of the embodiment of the present application are connected at angles in sequence. The first sub-surface 121 and the second sub-surface 122 can be connected at an acute angle, an obtuse angle or a right angle, and the second sub-surface 122 and the third sub-surface 123 can be connected at an acute angle, an obtuse angle or a right angle.

[0102] Optionally, the first sub-surface 121, the second sub-surface 122 and the third sub-surface 123 are all planes, the first sub-surface 121 and the second sub-surface 122 are connected at a right angle, and the second sub-surface 122 and the third sub-surface 123 are connected at a right angle, that is, the first sub-surface 121, the second sub-surface 122 and the third sub-surface 123 are surrounded to form a stepped surface. Of course, the first sub-surface 121, the second sub-surface 122 or the third sub-surface 123 can also be a curved surface.

[0103] like Figure 4 In the middle orientation, the first sub-surface 121 is located at the lower side of the third sub-surface 123 , and the third sub-surface 123 is closer to the probe rod 21 .

[0104] The number of the first elastic member 4 in the embodiment of the present application may be one or more, and the multiple first elastic members 4 may be arranged in sequence along the axial direction of the probe rod 21 .

[0105] Optionally, the annular side wall 12 includes a wall body and a limiting wall, the wall body surrounds the first cavity 11, the limiting wall is arranged at one end of the wall body away from the probe head 22, and extends inward from the wall body to form a limiting effect on the probe rod 21 to reduce the shaking of the probe rod 21.

[0106] By contacting one end of the first elastic member 4 against the second sub-surface 122 , the length of the first elastic member 4 can be shortened, thereby reducing the cost, compared with contacting the first elastic member 4 against the above-mentioned limiting wall.

[0107] In some embodiments, the number of the first elastic member 4 is one.

[0108] Setting the number of the first elastic member 4 to one facilitates controlling the compression amount of the first elastic member 4 compared to setting a plurality of first elastic members 4 .

[0109] In some embodiments, the connecting plate 13 is embedded with a connecting nut 14, and the connecting nut 14 is used to connect to the target object.

[0110] The connecting nut 14 of the embodiment of the present application is used for threaded connection with a target object.

[0111] Embedding the connecting nut 14 on the connecting plate 13 can make the thread have higher precision and save the process of making the thread on the connecting plate 13. In addition, after the connecting nut 14 is worn out and fails, the connecting nut 14 can be replaced without replacing the connecting plate 13, which saves costs.

[0112] In some embodiments, the wiring assembly 3 includes a first nut 31, a wiring terminal 32, and a second nut 33 which are sequentially sleeved on the outside of the probe rod 21. The first nut 31 and the second nut 33 are threadedly engaged with the probe rod 21. The wiring terminal 32 is clamped between the first nut 31 and the second nut 33 and is used to electrically connect to an external device.

[0113] The wiring terminal 32 of the embodiment of the present application is made of a conductive material, such as a metal material. The wiring terminal 32 is used to electrically connect to an external device and transmit current between the external device and the probe rod 21 .

[0114] Exemplarily, the wiring terminal 32 of the embodiment of the present application transmits current by contacting and abutting with the probe rod 21. Exemplarily, the first nut 31 and / or the second nut 33 abutting with the probe rod 21 may also be made of conductive material, so as to transmit current between the probe rod 21 and the wiring terminal 32, thereby improving the conductive performance of the wiring assembly 3.

[0115] Exemplarily, the first nut 31 and the second nut 33 are hexagonal nuts, but they may also be octagonal nuts.

[0116] The first nut 31 and the second nut 33 are threadedly matched with the probe rod 21 to fix the terminal 32 on the probe rod 21. The threaded connection is convenient for installation and disassembly, and the position of the terminal 32 can be adjusted. Moreover, the degree of tightening of the first nut 31 and the second nut 33 and the terminal 32 is adjustable, so that the first nut 31 and the second nut 33 can be tightly connected with the terminal 32, so that the terminal 32 is firmly fixed on the probe rod 21, thereby reducing the occurrence of conductive failure due to poor contact.

[0117] In some embodiments, a first gasket 34 is sandwiched between the wiring terminal 32 and the first nut 31 ; and / or a second gasket is sandwiched between the wiring terminal 32 and the second nut 33 .

[0118] The first gasket 34 in the embodiment of the present application may be made of metal material or insulating material.

[0119] Optionally, the first nut 31 is located on a side of the second nut 33 facing away from the mounting seat 1 , a first gasket 34 is sandwiched between the wiring terminal 32 and the first nut 31 , and the second nut 33 abuts against the mounting seat 1 .

[0120] A first gasket 34 is sandwiched between the terminal 32 and the first nut 31, or a second gasket is sandwiched between the terminal 32 and the second nut 33, so as to improve the tightness of the abutment between the first nut 31 and / or the second nut 33 and the terminal 32, reduce the axial displacement of the terminal 32 along the probe rod 21, and improve the reliability of the electrical connection between the terminal 32 and the probe rod 21.

[0121] Please continue to refer to Figure 4 and Figure 5 In some embodiments, the probe device 200 also includes a sampling needle 5, the probe rod 21 has a second cavity 211 penetrating itself along the first direction X, the probe head 22 has a third cavity 225 penetrating itself along the first direction X, the second cavity 211 and the third cavity 225 are connected, the sampling needle 5 is inserted into the second cavity 211 and the third cavity 225, and is used to abut against the pole of the battery cell to collect the voltage of the battery cell.

[0122] The sampling needle 5 of the embodiment of the present application can be fixed on the probe rod 21, for example, after coating the sampling needle 5 with an insulating layer, it is bonded to the probe rod 21 to fix the sampling needle 5. In this way, when the probe head 22 charges and discharges the battery cell, the sampling needle 5 also contacts the pole to collect the voltage of the battery cell.

[0123] The sampling needle 5 is arranged inside the probe rod 21 to increase the function of the probe device 200, that is, the voltage of the battery cell can be monitored while the battery cell is charged and discharged.

[0124] In some embodiments, the third cavity 225 includes a first sub-cavity 2251 and a second sub-cavity 2252, the first sub-cavity 2251 is located on a side of the second sub-cavity 2252 close to the mounting base 1, the maximum dimension of the second sub-cavity 2252 along the second direction Y is greater than the maximum dimension of the first sub-cavity 2251 along the second direction Y, the second direction Y is perpendicular to the first direction X, the sampling needle 5 includes a sampling needle rod 51 and a sampling needle head 52 arranged at one end of the sampling needle rod 51, the sampling needle head 52 is located in the second sub-cavity 2252, and is configured to be able to move in the direction from the sampling needle head 52 to the sampling needle rod 51, and is limited to the bottom surface 2253 of the second sub-cavity 2252.

[0125] The bottom surface 2253 of the second sub-cavity 2252 in the embodiment of the present application refers to the surface of the second sub-cavity 2252 facing the opening, wherein the opening is for the sampling needle 5 to be exposed.

[0126] The sampling needle 5 in the embodiment of the present application may be coated with an insulating coating on the outer surface to achieve insulation from the first probe 2 .

[0127] The sampling needle 5 of the embodiment of the present application is configured to be able to move along the direction from the sampling needle head 52 to the sampling needle rod 51, and is limited to the bottom surface 2253 of the second sub-cavity 2252. Since the sampling needle 5 is movable, the position of the sampling needle 5 relative to the first probe 2 is adjustable, which can increase the application range of the sampling needle 5, that is, it can also be applicable to uneven poles.

[0128] In some embodiments, the probe device 200 further includes an insulating sleeve 6 , which is sleeved on the sampling needle 5 and electrically isolates the sampling needle 5 from the first probe 2 .

[0129] The insulating sleeve 6 in the embodiment of the present application can be made of materials such as silicone, rubber or plastic.

[0130] The insulating sleeve 6 of the embodiment of the present application can be sleeved on a part of the surface of the sampling needle 5 facing the first probe 2, or can be sleeved on the entire surface of the sampling needle 5 facing the first probe 2. Specifically, the insulating sleeve 6 can be sleeved on the entire sampling needle head 52 and the entire sampling needle rod 51, or can be sleeved on part of the sampling needle head 52 and part of the sampling needle rod 51.

[0131] The sampling needle 5 and the first probe 2 are electrically isolated by the insulating sleeve 6 . The insulating sleeve 6 has a good insulating effect and is also convenient to install.

[0132] In some embodiments, the insulating sleeve 6 is sleeved on the sampling needle 52 and the portion of the sampling needle rod 51 close to the sampling needle 52 .

[0133] The insulating sleeve 6 of the embodiment of the present application can be an integrated structure, which is simultaneously sleeved on the sampling needle 52 and the sampling needle rod 51; it can also be two separately arranged parts, one part of which is sleeved on the sampling needle 52, and the other part is sleeved on the sampling needle rod 51, and the two parts are against each other, or bonded, or separated.

[0134] The insulating sleeve 6 is sleeved on the sampling needle 52 and the portion of the sampling needle rod 51 close to the sampling needle 52 . In this way, the amount of the insulating sleeve 6 can be reduced while the insulation effect of the sampling needle 5 and the first probe 2 is met, thereby reducing the material cost.

[0135] In some embodiments, the surface of the probe rod 21 facing the second cavity 211 includes a fourth sub-surface 212, a fifth sub-surface 213 and a sixth sub-surface 214 connected at an angle in sequence, the fourth sub-surface 212 and the sixth sub-surface 214 face the sampling needle rod 51, the fifth sub-surface 213 faces the sampling needle head 52, the insulating sleeve 6 is located on the side of the fifth sub-surface 213 facing the sampling needle head 52 and is spaced apart from the fifth sub-surface 213, the probe device also includes a second elastic member 7, one of the two opposite ends of the second elastic member 7 abuts against the part of the insulating sleeve 6 where the sampling needle rod 51 is sleeved, and the other end abuts against the fifth sub-surface 213; the sampling needle 5 has a first state and a second state, in the first state, the sampling needle head 52 protrudes from the end of the probe head 22 away from the probe rod 21; in the second state, the second elastic member 7 is squeezed by the insulating sleeve 6 and the fifth sub-surface 213.

[0136] The fourth sub-surface 212, the fifth sub-surface 213 and the sixth sub-surface 214 of the embodiment of the present application are connected at angles in sequence. The fourth sub-surface 212 and the fifth sub-surface 213 can be connected at an acute angle, an obtuse angle or a right angle, and the fifth sub-surface 213 and the sixth sub-surface 214 can be connected at an acute angle, an obtuse angle or a right angle.

[0137] Optionally, the fourth sub-surface 212, the fifth sub-surface 213 and the sixth sub-surface 214 are all planes, the fourth sub-surface 212 and the fifth sub-surface 213 are connected at a right angle, and the fifth sub-surface 213 and the sixth sub-surface 214 are connected at a right angle. Of course, the fourth sub-surface 212, the fifth sub-surface 213 and the sixth sub-surface 214 can also be curved surfaces.

[0138] The fourth sub-surface 212 of the embodiment of the present application is closer to the sampling needle 52 than the sixth sub-surface 214, and the sixth sub-surface 214 is closer to the sampling needle rod 51 than the fourth sub-surface 212. Figure 4 In the middle position, the fourth sub-surface 212 is located at the lower side of the sixth sub-surface 214 .

[0139] The second elastic member 7 in the embodiment of the present application may be a compression spring, or a rubber ring or the like.

[0140] When the probe device 200 is not pressed against the battery cell, that is, in the first state, the sampling needle 52 protrudes from the lower end of the probe head 22. When the probe device 200 is pressed against the pole of the battery cell, the sampling needle 52 moves toward the mounting seat 1 to squeeze the second elastic member 7, and the second elastic member 7 is in a compressed state. Under the elastic force of the second elastic member 7, the sampling needle 52 is in close contact with the pole, and the battery cell voltage is detected. At this time, the lower end of the sampling needle 52 may be flush with the lower end of the probe head 22, or not, and whether it is flush or not depends on the shape of the pole of the battery cell.

[0141] The second elastic member 7 is provided, and in the state of detecting voltage, the second elastic member 7 is in a compressed state, which improves the tightness of the abutment between the sampling needle 52 and the pole of the battery cell, thereby improving the reliability of the use of the sampling needle 5.

[0142] In some embodiments, the sampling needle 5 protrudes from one end of the probe rod 21 away from the probe head 22, and the probe device also includes an insulating sleeve 8, which is sleeved on the part of the sampling needle 5 protruding from the probe rod 21 and is clamped on the surface of the probe rod 21 away from the probe head 22.

[0143] The sampling needle rod 51 of the embodiment of the present application protrudes from the end of the probe rod 21 away from the probe head 22. The sampling needle rod 51 of the embodiment of the present application can be electrically connected to another sampling needle rod 51 through a conductive wire, so as to measure the voltage between the two poles of the battery cell.

[0144] The insulating sleeve 8 of the embodiment of the present application can be made of rubber or plastic material. The insulating sleeve 8 can be connected to the sampling needle rod 51 in an interference fit manner.

[0145] The probe rod 21 of the embodiment of the present application is away from the surface of the probe head 22, that is, Figure 4 The upper surface of the probe rod 21 is shown.

[0146] When the probe head 22 needs to be replaced, the insulating sleeve 8 can be removed from the sampling needle rod 51 , and then the sampling needle 5 can be taken out from below to separate the sampling needle 5 from the first probe 2 , and then the probe head 22 can be replaced.

[0147] An insulating sleeve 8 is provided to limit the sampling needle 5 on the probe rod 21 by using the insulating sleeve 8, so as to prevent the sampling needle 5 from slipping off the first probe 2, thereby improving the convenience of using the probe device 200.

[0148] In other embodiments, the sampling needle 5 is provided with a through hole at one end protruding from the probe rod 21 away from the probe head 22 , and a positioning pin is passed through the through hole. The positioning pin is clamped on the surface of the probe rod 21 away from the probe head 22 .

[0149] Figure 6 for Figure 3Enlarged view at B.

[0150] See also Figure 4 and Figure 6 In some embodiments, the sampling needle 5 is provided with a first through hole 511, and the insulating sleeve 8 is provided with a second through hole 81 penetrating the same, and the probe device 200 further includes a bayonet 9, which passes through the first through hole 511 and the second through hole 81 and connects the sampling needle 5 and the insulating sleeve 8 together.

[0151] The insulating sleeve 8 and the sampling needle 5 are connected together by the bayonet pin 9, so that the insulating sleeve 8 and the sampling needle 5 can be easily disassembled.

[0152] The embodiment of the present application further provides a battery production system 100, comprising the above-mentioned probe device 200, and the probe device 200 is used to perform charging and discharging operations on battery cells.

[0153] See also Figure 2-Figure 6The embodiment of the present application provides a probe device 200, including a mounting seat 1, a first probe 2, a wiring assembly 3 and a first elastic member 4. The mounting seat 1 is used to connect the target object, and the mounting seat 1 has a first cavity 11 that penetrates itself along the first direction X; the first probe 2 includes a probe rod 21 and a probe head 22, the probe rod 21 is inserted into the first cavity 11, and both opposite ends extend out of the first cavity 11, the probe head 22 is fixed to one end of the probe rod 21, and is used to press against the pole of the battery cell, the probe head 22 and the probe rod 21 are two separate parts and are electrically connected; the wiring assembly 3 is located on the side of the mounting seat 1 away from the probe head 22, the wiring assembly 3 is sleeved and fixed on the probe rod 21, the wiring assembly 3 is used to be electrically connected to an external device, and transmit current between the external device and the probe rod 21; the first elastic member 4 is sleeved on the probe rod 21, and the first elastic member 4 is configured to be squeezed by the mounting seat 1 and the probe head 22, and to limit the probe head 22 outside the first cavity 11. The probe head 22 is provided with a recess 221, which is recessed from the surface of the probe head 22 facing the mounting seat 1 to the side away from the mounting seat 1. One end of the probe rod 21 extends into the recess 221 and is connected to the side wall 222 of the recess 221 and the bottom wall 223 of the recess 221. The probe head 22 is provided with a groove 224, which is recessed inward from the outer peripheral surface of the probe head 22 and extends along the circumference of the probe head 22 to at least part of the outer peripheral surface. The groove 224 is used to cooperate with a tool for separating the probe head 22 and the probe rod 21. The mounting seat 1 includes an annular side wall 12 and a connecting plate 13 arranged on at least part of the outer peripheral side of the annular side wall 12. The inner surface of the annular side wall 12 is surrounded to form a first cavity 11. The connecting plate 13 is used to connect with the target object. The inner surface of the annular side wall 12 includes a first sub-surface 121, a second sub-surface 122 and a third sub-surface 123 connected at an angle in sequence. The first sub-surface 121 and the third sub-surface 123 face the probe rod 21, and the second sub-surface 122 faces the probe head 22. One end of the first elastic member 4 abuts against the second sub-surface 122. The number of the first elastic member 4 is one. The connecting plate 13 is embedded with a connecting nut 14, and the connecting nut 14 is used to connect with the target object. The wiring assembly 3 includes a first nut 31, a wiring terminal 32 and a second nut 33 which are sequentially sleeved outside the probe rod 21. The first nut 31 and the second nut 33 are threadedly matched with the probe rod 21. The wiring terminal 32 is sandwiched between the first nut 31 and the second nut 33 and is used to be electrically connected with an external device. The probe device 200 also includes a sampling needle 5. The probe rod 21 has a second cavity 211 that penetrates itself along the first direction X. The probe head 22 has a third cavity 225 that penetrates itself along the first direction X. The second cavity 211 and the third cavity 225 are connected. The sampling needle 5 is inserted into the second cavity 211 and the third cavity 225 and is used to abut against the pole of the battery cell to collect the voltage of the battery cell.The third cavity 225 includes a first sub-cavity 2251 and a second sub-cavity 2252. The first sub-cavity 2251 is located on a side of the second sub-cavity 2252 close to the mounting seat 1. The maximum dimension of the second sub-cavity 2252 along the second direction Y is greater than the maximum dimension of the first sub-cavity 2251 along the second direction Y. The second direction Y is perpendicular to the first direction X. The sampling needle 5 includes a sampling needle rod 51 and a sampling needle head 52 disposed at one end of the sampling needle rod 51. The sampling needle head 52 is located in the second sub-cavity 2252 and is configured to be able to move from the sampling needle head 52 to the sampling needle rod 51 and is limited to the bottom surface 2253 of the second sub-cavity 2252. The probe device 200 also includes an insulating sleeve 6, which is sleeved on the sampling needle 5 and electrically isolates the sampling needle 5 from the first probe 2. The insulating sleeve 6 is sleeved on the sampling needle head 52 and the portion of the sampling needle rod 51 close to the sampling needle head 52. The surface of the probe rod 21 facing the second cavity 211 includes a fourth sub-surface 212, a fifth sub-surface 213 and a sixth sub-surface 214 connected at an angle in sequence, the fourth sub-surface 212 and the sixth sub-surface 214 face the sampling needle rod 51, the fifth sub-surface 213 faces the sampling needle head 52, the insulating sleeve 6 is located on the side of the fifth sub-surface 213 facing the sampling needle head 52 and is spaced apart from the fifth sub-surface 213, the probe device also includes a second elastic member 7, one of the two opposite ends of the second elastic member 7 abuts against the part of the insulating sleeve 6 on which the sampling needle rod 51 is sleeved, and the other end abuts against the fifth sub-surface 213; the sampling needle 5 has a first state and a second state, in the first state, the sampling needle head 52 protrudes from the end of the probe head 22 away from the probe rod 21; in the second state, the second elastic member 7 is squeezed by the insulating sleeve 6 and the fifth sub-surface 213. The sampling needle 5 protrudes from the end of the probe rod 21 away from the probe head 22, and the probe device further includes an insulating sleeve 8, which is sleeved on the portion of the sampling needle 5 protruding from the probe rod 21 and clamped on the surface of the probe rod 21 away from the probe head 22. The sampling needle 5 is provided with a first through hole 511, and the insulating sleeve 8 is provided with a second through hole 81 penetrating through the sampling needle 5. The probe device 200 further includes a bayonet 9, which passes through the first through hole 511 and the second through hole 81 and connects the sampling needle 5 and the insulating sleeve 8 together.

[0154] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A probe device, characterized in that: include: A mounting seat, used to connect to a target object, the mounting seat having a first cavity penetrating the mounting seat along a first direction; A first probe, comprising a probe rod and a probe head, wherein the probe rod is inserted into the first cavity, and both opposite ends thereof extend out of the first cavity, the probe head is fixed to one end of the probe rod and is used to press against the pole of the battery cell, and the probe head and the probe rod are two separate parts and are electrically connected; A wiring assembly is located on a side of the mounting base away from the probe head, the wiring assembly is sleeved and fixed to the probe rod, and the wiring assembly is used to be electrically connected to an external device and transmit current between the external device and the probe rod; The first elastic member is sleeved on the probe rod, and the first elastic member is configured to be able to be squeezed by the mounting seat and the probe head, and to limit the probe head outside the first cavity.

2. The probe device according to claim 1, characterized in that The probe head is provided with a recessed portion, which is recessed from the surface of the probe head facing the mounting seat to the side away from the mounting seat. One end of the probe rod extends into the recessed portion and is connected to the side wall and the bottom wall of the recessed portion.

3. The probe device according to claim 1, characterized in that: The probe head is provided with a groove, which is recessed inward from the outer circumference of the probe head and extends along the circumference of the probe head to at least a portion of the outer circumference, and the groove is used to cooperate with a tool for separating the probe head and the probe rod.

4. The probe device according to claim 1, characterized in that: The mounting seat includes an annular side wall and a connecting plate disposed on at least a portion of the outer circumference of the annular side wall, the inner surface of the annular side wall is arranged to form the first cavity, and the connecting plate is used to connect with the target object. The inner surface of the annular side wall includes a first sub-surface, a second sub-surface and a third sub-surface connected in sequence at an angle, the first sub-surface and the third sub-surface face the probe rod, the second sub-surface faces the probe head, and one end of the first elastic member abuts against the second sub-surface.

5. The probe device according to claim 4, characterized in that: The number of the first elastic member is one.

6. The probe device according to claim 4, characterized in that: The connecting plate is embedded with a connecting nut, and the connecting nut is used to connect the target object.

7. The probe device according to claim 1, characterized in that: The wiring assembly includes a first nut, a wiring terminal and a second nut which are sequentially sleeved on the outside of the probe rod. The first nut and the second nut are threadedly engaged with the probe rod. The wiring terminal is clamped between the first nut and the second nut and is used to electrically connect to an external device.

8. The probe device according to any one of claims 1 to 7, characterized in that: The probe device also includes a sampling needle, the probe rod has a second cavity penetrating itself along the first direction, the probe head has a third cavity penetrating itself along the first direction, the second cavity and the third cavity are connected, the sampling needle is inserted into the second cavity and the third cavity, and is used to abut against the pole of the battery cell to collect the voltage of the battery cell.

9. The probe device according to claim 8, characterized in that: The third cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity is located on a side of the second sub-cavity close to the mounting seat, the maximum dimension of the second sub-cavity along the second direction is greater than the maximum dimension of the first sub-cavity along the second direction, and the second direction is perpendicular to the first direction. The sampling needle includes a sampling needle rod and a sampling needle head arranged at one end of the sampling needle rod. The sampling needle head is located in the second sub-cavity and is configured to be able to move along the direction from the sampling needle head to the sampling needle rod and is confined to the bottom surface of the second sub-cavity.

10. The probe device according to claim 9, characterized in that The probe device further comprises an insulating sleeve, which is sleeved on the sampling needle and electrically isolates the sampling needle from the first probe.

11. The probe device according to claim 10, characterized in that: The insulating sleeve is sleeved on the sampling needle and the portion of the sampling needle rod close to the sampling needle.

12. The probe device according to claim 11, characterized in that The surface of the probe rod facing the second cavity includes a fourth sub-surface, a fifth sub-surface and a sixth sub-surface connected in sequence at an angle, the fourth sub-surface and the sixth sub-surface face the sampling needle rod, the fifth sub-surface faces the sampling needle head, and the insulating sleeve is located on a side of the fifth sub-surface facing the sampling needle head and is spaced apart from the fifth sub-surface. The probe device also includes a second elastic member, one of the two opposite ends of the second elastic member abuts against the part of the sampling needle rod on which the insulating sleeve is mounted, and the other end abuts against the fifth sub-surface; the sampling needle has a first state and a second state, in the first state, the sampling needle head protrudes from the end of the probe head away from the probe rod; in the second state, the second elastic member is squeezed by the insulating sleeve and the fifth sub-surface.

13. The probe device according to claim 8, characterized in that The sampling needle protrudes from one end of the probe rod away from the probe head. The probe device further comprises an insulating sleeve, which is sleeved on a portion of the sampling needle protruding from the probe rod and clamped on a surface of the probe rod away from the probe head.

14. The probe device according to claim 13, characterized in that: The sampling needle is provided with a first through hole, and the insulating sleeve is provided with a second through hole penetrating the insulating sleeve. The probe device further comprises a bayonet pin, which passes through the first through hole and the second through hole and connects the sampling needle and the insulating sleeve together.

15. A battery production system, characterized in that: It comprises a probe device as described in any one of claims 1 to 14, and the probe device is used to perform charging and discharging operations on a battery cell.

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