Air exhaust assembly, exhaust detection assembly and exhaust detection equipment

Abstract

The utility model provides an air exhaust assembly, which relates to the field of batteries and comprises a support, a first air exhaust assembly and a second air exhaust assembly. One end of the air exhaust head is slidably connected with the first through hole in the first direction, so that the air exhaust head can slide relative to the support in the first direction, and a fluid channel is formed in the air exhaust head; the elastic reset piece is located between the support and the air exhaust head in the first direction; wherein in the first direction, the other end, opposite to the end connected with the support, of the air exhaust head is provided with an air exhaust opening communicated with the fluid channel, and the air exhaust assembly can reduce the possibility of electrolyte leakage in the exhaust process while exhausting gas generated in the battery structure.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to an air extraction component, an exhaust detection component and exhaust detection equipment. Background Art

[0002] Formation is a process in the manufacturing process of battery cells. After the packaging is completed to form the battery structure, the ions in the electrolyte need to undergo an oxidation-reduction reaction between the positive and negative electrode plates through the action of an external current. During the electrochemical forming process, gas will be generated inside the battery structure, and the gas in the battery needs to be discharged. During the exhaust process, the electrolyte may leak. Utility Model Content

[0003] The utility model provides an exhaust component, an exhaust detection component and an exhaust detection device, which can solve the technical problem of how to discharge the gas generated in the battery structure and reduce the possibility of electrolyte leakage during the exhaust process.

[0004] In a first aspect, an embodiment of the utility model provides an exhaust component, which includes: a bracket having a first through hole; an exhaust head, one end of which is slidably connected to the first through hole in a first direction, so that the exhaust head can slide relative to the bracket in the first direction, and the exhaust head has a fluid channel; an elastic return member is located between the bracket and the exhaust head in the first direction; wherein, in the first direction, the other end of the exhaust head opposite to the end connected to the bracket has an exhaust port connected to the fluid channel.

[0005] By enabling the vacuum head to move in a first direction relative to the bracket and arranging an elastic reset member between the vacuum head and the bracket, when the vacuum head abuts against the liquid injection port valve of the battery structure, the vacuum head can move in the first direction relative to the bracket and the elastic reset member can be elastically deformed. Therefore, when the vacuum head abuts against the liquid injection port valve, the elastic reset force enables the vacuum head to abut the opened liquid injection port more tightly, thereby enabling the vacuum head to seal the opened liquid injection port, thereby reducing the possibility of electrolyte in the battery structure leaking out of the battery structure and the fluid channel through the liquid injection port, and reducing the possibility of electrolyte contaminating the outer surface of the battery structure.

[0006] In some embodiments, the vacuum extraction component also includes: a sliding sleeve fixed to the first through hole, and a second through hole is provided in the sliding sleeve; wherein, one end of the vacuum extraction head is slidably connected to the second through hole so that the vacuum extraction head can slide relative to the bracket in a first direction.

[0007] The sleeve passes through the first through hole and is fixedly connected to the bracket, that is, the radial movement of the sleeve in the first through hole is limited by the force exerted on the sleeve by the hole wall of the first through hole, and the movement of the sleeve in the first direction is limited by the friction between the hole wall and the sleeve; at the same time, the relative movement of the suction head in the radial direction of the second through hole is limited by the abutment force between the suction head and the hole wall of the second through hole of the sleeve, and the movement of the suction head in the first direction is limited by the friction between the hole wall of the second through hole and the suction head.

[0008] In some embodiments, there are multiple air suction ports, and the multiple air suction ports are spaced apart around the first direction.

[0009] By arranging a plurality of exhaust ports at intervals around the first direction, at least a portion of the exhaust ports and the opening of the liquid injection port valve are located on the same side, so that the exhaust ports can be connected to the opening of the liquid injection port valve, and the total area of ​​the exhaust ports connected to the opening of the liquid injection port valve is increased, thereby improving the exhaust efficiency.

[0010] In some embodiments, the vacuum head includes: a push rod, the fluid channel is provided therein, one end of the push rod is slidably connected to the first through hole so that the push rod can slide relative to the bracket in the first direction, and the other end of the push rod opposite to the one end has an air vent connected to the fluid channel; a suction nozzle, located at the end of the push rod having the air vent and fixed to the side wall of the push rod, and the end of the suction nozzle has the vacuum port; wherein there are multiple air ports, and the multiple air ports are spaced apart around the first direction, the air vent is connected to the vacuum port, and the suction nozzle is sealed from the side wall.

[0011] By arranging a suction nozzle between the end face and the injection port valve and arranging an air suction port at the end of the suction nozzle, and fixing the suction nozzle to the side wall of the push rod, the force for opening the injection port valve is directly borne by the suction nozzle and transmitted to the side wall of the push rod, that is, the force will not be transmitted to the end face of the push rod with the air vent, thereby extending the service life of the end face. At the same time, the opening of the injection port valve can enter the suction nozzle from one side of the air suction port and flow through the air vent on at least one side into the fluid channel, thereby taking into account the exhaust efficiency. At the same time, the suction nozzle and the side wall of the push rod are sealed, thereby reducing the possibility of gas leakage between the suction nozzle and the side wall of the push rod.

[0012] In some embodiments, the push rod includes: a connecting part, one end of which is located in the first through hole; a ventilation part, fixed to the other end opposite to the one end of the connecting part, in a direction perpendicular to the first direction, the size of the ventilation part is smaller than the size of the connecting part, a plurality of the vents are arranged at intervals around the first direction at the end of the ventilation part, and the side wall of the ventilation part has a third through hole connected to the fluid channel; wherein, the interior of the suction nozzle has a blind hole connected to the air suction port, the blind hole forms a tight fit with the side wall of the connecting part, the hole wall of the blind hole and the outer surface of the ventilation part surround to form a ventilation cavity, and the vent connects the air suction port and the ventilation cavity, and the third through hole connects the ventilation cavity and the fluid channel.

[0013] By making the size of the vent part smaller than that of the connecting part in a direction perpendicular to the first direction, a gap is formed between the side wall of the vent part and the hole wall of the blind hole while the blind hole can form a tight fit with the side wall of the connecting part, so that a vent cavity can be formed between the outer surface of the vent part and the hole wall of the blind hole; and the air suction port and the vent cavity are connected through the vent, and the vent cavity and the fluid channel are connected through the third through hole, that is, the vent is indirectly connected to the fluid channel through the vent cavity and the third through hole, that is, the gas extracted by the air suction port flows into the vent cavity through the vent, and the gas in the vent cavity flows into the fluid channel through the third through hole, so that the vent does not need to extend to the interior of the vent, thereby reducing the influence of the vent on the structural strength of the vent, and reducing the manufacturing cost and difficulty of the vent.

[0014] In some embodiments, the connecting portion has a limit block protruding from the side wall of the connecting portion, and in the first direction, the distance between the end face of the limit block close to the ventilation portion and the end face of the ventilation portion having the ventilation opening is no greater than the depth of the blind hole.

[0015] By setting a limit block, when the external force on the suction nozzle is greater than the maximum static friction between the side walls of the blind hole and the connecting part, the external force in the first direction is borne by the limit block, thereby more reliably limiting the relative movement of the suction nozzle with respect to the push rod in the first direction, and the distance between the end face of the limit block close to the ventilation part and the end face of the ventilation part with the ventilation opening is greater than the hole depth of the blind hole, thereby reducing the possibility that the hole wall of the blind hole abuts against the end face of the ventilation part with the ventilation opening due to the movement of the suction nozzle relative to the push rod, thereby reducing the possibility that the end face of the ventilation part with the ventilation opening is subjected to the force in the first direction, and further extending the service life of the ventilation part.

[0016] In some embodiments, the end of the suction nozzle has a sealing surface, and the size of the sealing surface increases from the end away from the push rod to the end close to the push rod in a direction perpendicular to the first direction.

[0017] By arranging a sealing surface on the end face of the suction nozzle, during the process of the suction nozzle abutting against the liquid injection port valve, the portion of the suction nozzle with the sealing surface extends into the liquid injection port, so that the exhaust port can more directly extract the gas in the battery cell, and at the same time, the sealing surface is closely attached to the liquid injection port, thereby reducing the possibility of the electrolyte in the battery cell leaking out of the battery cell through the liquid injection port. Moreover, since the size of the sealing surface increases from the end away from the top rod to the end close to the top rod in a direction perpendicular to the first direction, a structure similar to a cone is formed. Therefore, during the process of extending the suction nozzle into the liquid injection port, the side wall of the cone-shaped structure can guide the suction nozzle, so that the suction nozzle is located at the center of the liquid injection port, and the sealing surface can abut against the hole wall of the liquid injection port at all parts in the circumferential direction, thereby further improving the sealing effect of the suction nozzle on the liquid injection port.

[0018] In some embodiments, there are a plurality of the first through holes, and the vacuum assembly has a plurality of vacuum heads, each of which is slidably connected to the bracket through each of the first through holes.

[0019] By providing a plurality of first through holes to respectively install exhaust heads, a plurality of battery cells can be exhausted through the plurality of exhaust heads, thereby improving exhaust efficiency.

[0020] In some embodiments, a plurality of the first through holes are spaced apart along a second direction, and the bracket further has a deformation groove connected to the first through hole, and the deformation groove extends along a third direction to the edge of the bracket; wherein the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction, and has a preset angle with the second direction.

[0021] By providing a deformation groove which is communicated with the first through hole and extends to the edge of the bracket, the first through hole can be more easily deformed in the radial direction, thereby facilitating the installation of the air extraction head into the first through hole.

[0022] In some embodiments, the deformation groove includes: a first deformation portion, connected to the first through hole and extending along the second direction; a second deformation portion, connected to the first deformation portion and extending along the third direction to the edge of the bracket; wherein the bracket also has a threaded hole, and the threaded hole extends from one side of the first deformation portion to the other side of the first deformation portion in a direction perpendicular to the second direction.

[0023] The bolts and the threaded holes enable the first through hole to produce a more reliable shrinkage deformation, thereby enabling the first through hole to more reliably apply friction to the vacuum head, thereby improving the connection reliability between the vacuum head and the bracket.

[0024] In the second aspect, the embodiment of the utility model also provides an exhaust detection component, which includes: an exhaust component as described in the embodiment of the first aspect above, an exhaust device, which is connected to the exhaust head through an exhaust pipeline, and the exhaust pipeline is connected to the fluid channel; a flow detection device, which is connected to the exhaust pipeline.

[0025] Whether the exhaust of the battery cell is normal is detected by the flow rate of the air flow, that is, when the flow rate of the air flow is greater than the preset flow threshold, it is determined that the exhaust of the battery cell is normal; when the flow rate of the air flow is less than the preset flow threshold, it is determined that the liquid filling valve of the battery cell is not opened normally, resulting in abnormal exhaust of the battery cell.

[0026] In some embodiments, the vacuum assembly includes: a sliding sleeve that passes through the first through hole and is fixedly connected to the bracket, and the sliding sleeve has a second through hole; wherein the vacuum pipeline is fixedly connected to the sliding sleeve, and the vacuum pipeline is connected to the fluid channel through the second through hole.

[0027] By means of a sliding sleeve fixedly connected to the bracket, the vacuum head can be slidably connected to the bracket through the sliding sleeve, while the vacuum pipeline, the vacuum device and the flow detection device are kept relatively still with the bracket, that is, the vacuum pipeline, the vacuum device and the flow detection device do not move with the movement of the vacuum head, and the vacuum device is connected to the fluid channel in the vacuum head through the second through hole, thereby improving the air tightness between the vacuum device and the second through hole.

[0028] In the third aspect, the embodiment of the utility model also provides an exhaust detection device, which is applied to a battery structure, and the battery structure has a normally closed liquid injection valve, and the liquid injection valve can be opened under the action of a first force, and the first force is directed from the outside of the battery structure to the inside of the battery structure; the exhaust detection device comprises: a fixing device, having a movable part and a fixed part, the movable part and the fixed part are movably connected, the movable part is connected to the battery structure, and the fixed part is fixedly connected to the bracket; an exhaust detection component as described in the embodiment of the second aspect above; a driving device, connected to the movable part, for driving the movable part to move relative to the vacuum head, so that the vacuum head can apply the first force to the liquid injection valve and connect the fluid channel with the liquid injection port.

[0029] By arranging a driving device, the vacuum head can generate relative movement with the movable part of the fixing device, and the battery structure is fixed to the movable part, so that the vacuum head can apply a first force to the liquid injection port valve of the battery structure, and push the liquid injection port valve open by the first force, so that the fluid channel of the vacuum head can be connected with the liquid injection port of the battery structure. In this state, the exhaust detection component can extract the gas generated in the battery structure during the formation process through the vacuum head, that is, it can discharge the gas generated in the battery structure with the liquid injection port valve, thereby reducing the possibility that the gas in the battery structure affects the performance and safety performance of the battery; moreover, the exhaust detection component can also detect the flow rate of the extracted gas, so as to determine whether the liquid injection port valve is opened normally and whether the gas in the battery structure is discharged normally through the total amount of the gas flow rate, thereby further improving the exhaust reliability of the battery structure.

[0030] In a fourth aspect, the utility model also provides a method for manufacturing a battery cell, the manufacturing method comprising: forming a battery structure by assembly and liquid injection, and charging the battery structure at a preset voltage and for a preset time, wherein the battery structure has a normally closed liquid injection valve, and the liquid injection valve can be opened under the action of a first force, and the first force is directed from the outside of the battery cell to the inside of the battery cell; exhausting the charged battery structure and detecting the exhaust status through the exhaust detection equipment described in the embodiment of the third aspect above; sealing the liquid injection valve of the battery structure with normal exhaust to form the battery cell.

[0031] By arranging a driving device, the vacuum head can generate relative movement with the movable part of the fixing device, and the battery structure is fixed to the movable part, so that the vacuum head can apply a first force to the liquid injection port valve of the battery structure, and push the liquid injection port valve open by the first force, so that the fluid channel of the vacuum head can be connected with the liquid injection port of the battery structure. In this state, the exhaust detection component can extract the gas generated in the battery structure during the formation process through the vacuum head, that is, it can discharge the gas generated in the battery structure with the liquid injection port valve, thereby reducing the possibility that the gas in the battery structure affects the performance and safety performance of the battery; moreover, the exhaust detection component can also detect the flow rate of the extracted gas, so as to determine whether the liquid injection port valve is opened normally and whether the gas in the battery structure is discharged normally through the total amount of the gas flow rate, thereby further improving the exhaust reliability of the battery structure.

[0032] In a fifth aspect, an embodiment of the utility model further provides a battery, the battery comprising at least one battery cell, the battery cell being manufactured by the manufacturing method provided in the embodiment of the fourth aspect above.

[0033] In a sixth aspect, an embodiment of the utility model further provides an electrical device, wherein the electrical device comprises a battery as provided in the embodiment of the fifth aspect above.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 It is a schematic diagram of the structure of a vehicle in some embodiments of the utility model;

[0037] Figure 2 Schematic diagram of the exploded structure of batteries in some embodiments of the present utility model;

[0038] Figure 3 It is a schematic diagram of the structure of the battery cell of some embodiments of the utility model;

[0039] Figure 4 It is a structural schematic diagram of an air extraction component in some embodiments of the utility model;

[0040] Figure 5 An exploded view of an air extraction assembly in some embodiments of the utility model;

[0041] Figure 6 It is a structural schematic diagram of an air extraction head in an air extraction assembly in some embodiments of the utility model;

[0042] Figure 7 An exploded view of an air extraction head in an air extraction assembly in some embodiments of the utility model;

[0043] Figure 8 A cross-sectional view of an air extraction head in an air extraction assembly in some embodiments of the utility model;

[0044] Fig. 9 It is a schematic diagram of assembling the air extraction head and the bracket in the air extraction assembly of some embodiments of the utility model;

[0045] Fig.10 It is a schematic diagram of the structure of the bracket in the air extraction assembly of some embodiments of the utility model;

[0046] Fig.11 for Fig.10 A partial enlarged view of part A;

[0047] Fig.12 It is a schematic diagram of the structure of the exhaust gas detection assembly of some embodiments of the utility model;

[0048] Fig.13 An exploded view of an exhaust gas detection assembly according to some embodiments of the present invention;

[0049] Fig.14 It is a schematic diagram of the structure of the exhaust gas detection device of some embodiments of the utility model;

[0050] Fig.15 The present invention is a schematic diagram of a process for manufacturing a battery cell according to some embodiments of the present invention.

[0051] The reference numerals in the specific implementation manner are as follows:

[0052] 1000. Vehicles;

[0053] 100, battery; 200, controller; 300, motor;

[0054] 10. Box body; 11. First part; 12. Second part;

[0055] 20. battery cell; 21. housing; 22. tab; 23. liquid injection port; 24. liquid injection port valve;

[0056] 310, suction assembly; 311, bracket; 3111, first through hole; 3112, deformation groove; 3113, first deformation part; 3114, second deformation part; 3115, threaded hole; 312, suction head; 3121, suction port; 3122, ejector rod; 3123, nozzle; 3124, vent; 3125, connecting part; 31251, limit block; 3126, vent part; 3127, third through hole; 3128, blind hole; 3129, ventilation cavity; 313, elastic reset member; 314, sleeve; 3141, second through hole;

[0057] 320, exhaust detection assembly; 330, flow detection device; 331, air extraction pipeline; 332, buckle;

[0058] 30. Exhaust detection equipment; 340. Fixing device; 341. Moving part; 342. Fixed part; 350. Driving device. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0068] The power battery includes at least one battery cell. During the manufacturing process of the battery cell, after the pole pieces are assembled, the electrolyte is injected, and the battery structure is packaged, it is necessary to charge the battery structure according to a predetermined rule, that is, to form the battery structure, so that during the first charging process, a reaction occurs at the solid-liquid interface between the electrode material and the electrolyte to form a solid electrolyte interface membrane. Ions can freely embed and escape from the electrode material through the solid electrolyte interface membrane. The formation of the solid electrolyte interface membrane is crucial to the performance of the battery. The solid can not only prevent the co-embedding of solvent molecules and avoid damage to the electrode material, but also effectively improve the cycle performance and service life of the battery. During the formation process, gases will be formed in the battery structure. These gases may form isolated cavities between the positive and negative electrodes, thereby affecting the performance of the battery cell. If too much gas is generated, it may also cause excessive gas pressure in the battery structure, resulting in an impact on the safety performance of the battery. The gas generated in the battery structure needs to be discharged in time through an exhaust device.

[0069] The relevant exhaust device extracts the gas in the battery structure through the liquid injection port of the battery structure. In order to enable the exhaust device to extract the gas in the battery structure more reliably, it is necessary to keep the exhaust head of the exhaust device and the liquid injection port of the battery structure relatively still. The utility model inventor found that for a new type of battery cell, the liquid injection port of the battery cell has a liquid injection port valve. If the relevant exhaust device is used to exhaust the new type of battery cell, the liquid injection port valve will block the exhaust head from extracting the gas in the battery structure, resulting in the gas in the battery structure cannot be smoothly discharged.

[0070] Based on the above considerations, in order to solve the technical problem of how to extract the gas in a battery structure with an injection port valve, the utility model inventor, through in-depth research on the new battery cell, found that the purpose of providing the injection port valve at the injection port is to prevent the electrolyte in the battery structure from leaking out of the injection port, but in order to enable the electrolyte to be smoothly injected from the injection port, it is necessary to prevent the injection port valve from opening under the action of a force directed from the inside of the battery structure to the outside of the battery structure so that the electrolyte cannot leak out of the injection port, and to enable the injection port valve to open under the action of a force directed from the outside of the battery structure to the inside of the battery structure, so that the electrolyte can be injected into the battery structure through the injection port. Based on the characteristics of the liquid injection port valve, the utility model inventor overcame the technical prejudice of technical personnel that the vacuum head and the liquid injection port need to remain relatively still, and thus creatively proposed a new exhaust detection device, the exhaust detection device has a vacuum head and a driving device, the vacuum head has a vacuum head, the vacuum head has a fluid channel, the driving device can make the vacuum head and the battery structure move relative to each other, so that the vacuum head can exert a force on the liquid injection port valve from the outside of the battery structure to the inside of the battery structure, so that the vacuum head pushes open the liquid injection port valve and connects the fluid channel of the vacuum head with the internal space of the battery structure.

[0071] At the same time, the exhaust detection equipment also includes an exhaust pressure measuring device connected to the fluid channel, and the exhaust pressure measuring device is connected to the fluid channel. When the exhaust head pushes the liquid injection valve open, the gas inside the battery structure is extracted through the fluid channel; the exhaust detection equipment can also detect the air pressure of the exhausted gas, so as to detect whether the battery structure is exhausted normally through the detected air pressure. Specifically, if the maximum value of the detected air pressure is greater than the preset threshold value, it means that the liquid injection valve is opened normally and the gas in the battery pack is discharged normally. If the maximum value of the detected air pressure is less than the preset threshold value, it means that the liquid injection valve cannot be opened, resulting in the inability to discharge the gas in the battery structure normally. After the detection is completed, the battery structure that can be exhausted normally will be transplanted to the next workstation of the battery cell manufacturing production line, and the exhausted battery structure will be capped and tested to form a battery cell, and the battery structure with abnormal exhaust will be transplanted to the abnormal port for processing or the battery structure with abnormal exhaust will be manually removed from the battery cell manufacturing production line online.

[0072] Furthermore, the inventor of the utility model also noticed that since the liquid filling port valve is pushed open by the vacuum head during the exhaust process, the electrolyte in the battery may leak out of the liquid filling port under the influence of the gas during the exhaust process, thereby causing the electrolyte to contaminate the outer surface of the battery structure. In order to solve this problem, the inventor of the utility model further configured the vacuum head as a structure that can be slidably connected to the bracket, and provided an elastic reset member between the bracket and the vacuum head. When the vacuum head pushes open the liquid filling port valve, the elastic force applied to the vacuum head by the elastic reset member enables the vacuum head to be close to the liquid filling port, thereby blocking the liquid filling port through the vacuum head, thereby reducing the possibility of the electrolyte leaking out of the battery structure and the fluid channel from the liquid filling port and contaminating the outer surface of the battery structure.

[0073] The vacuum assembly disclosed in the embodiment of the utility model can be applied to an exhaust detection device, which can automatically control the vacuum assembly to push open the liquid injection port valve of the battery structure and exhaust the gas through the exhaust detection device, or manually make the battery structure and the vacuum assembly move relative to each other, so that the vacuum structure can push open the liquid injection port valve and exhaust the battery structure.

[0074] The exhaust detection device disclosed in the embodiment of the utility model is applied to a battery structure. Specifically, the exhaust detection device is used to exhaust the battery structure in the process of manufacturing a battery cell. The battery structure is an intermediate structure in the process of manufacturing a battery cell, that is, a structure with spaced pole pieces and electrolyte injected inside after assembly, liquid injection and packaging. After the battery structure is formed and exhausted by the exhaust detection device, the outlet valve of the battery structure is sealed by wax seals or sealing nails to form a battery cell. It should be noted that the exhaust detection device can be a station of a battery cell production line, and the battery structure of the previous station is transferred to the exhaust detection device through a transfer device, and after the battery structure is exhausted online, the battery with normal exhaust is deconstructed and transplanted to the next station through the transfer device; the exhaust detection device can also be an independent device. After the battery structure is formed by assembly, liquid injection and sealing of the production line, the battery structure is transported to the exhaust detection device, so as to exhaust the battery structure offline.

[0075] The manufacturing method of the battery cell disclosed in the embodiment of the utility model can be used to manufacture different battery cells, and the battery cell can be applicable to different electrical devices. For example, the battery cell can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery cell and battery disclosed in the present application can be used to form the electrical device, so that the gas in the battery cell obtained by the above manufacturing method can be discharged normally, thereby improving the performance and safety of the battery cell.

[0076] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0077] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0078] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0079] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is accommodated in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0081] In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 20 as a whole may be accommodated in the case 10; of course, the battery 100 may also be a battery module in which the plurality of battery cells 20 are first connected in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the case 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between the plurality of battery cells 20. Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes. The battery cell 20 refers to the smallest unit that makes up the battery. Please refer to Figure 3 , Figure 32 is a schematic diagram of the structure of a battery cell 20. The battery cell 20 includes a housing 21, and a housing cavity is provided in the housing 21. The housing cavity is used to accommodate electrolyte and positive and negative plates, and a diaphragm is usually provided between the positive and negative plates. The parts of the positive and negative plates that do not have active materials each constitute a tab 22. The positive tab and the negative tab can be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 22 connects the electrode terminal to form a current loop. The housing 21 has a liquid injection port 23 connected to the housing cavity, and the liquid injection port 23 is provided with a liquid injection port valve 24. In the process of manufacturing the battery cell 20, the liquid injection port valve 24 can be opened under the action of a force directed from the outside of the housing cavity to the inside of the housing cavity for liquid injection and exhaust. After the liquid injection and exhaust are completed, the liquid injection port 23 is sealed by a wax seal or a sealing nail, so that the liquid injection port valve 24 cannot be opened during the use of the battery cell 20.

[0082] According to some embodiments of the present invention, a gas extraction component is provided, which is used to exhaust gas in a battery structure. The battery structure is as follows: Figure 3 The battery cell 20 shown in the figure is in an intermediate state during the production process. It can be understood that the battery structure is a structure in which the liquid injection port valve 24 of the battery cell 20 is not yet sealed. Figure 3 and Figure 4 The structure of the air extraction component is exemplarily described. The air extraction component 310 includes: a bracket 311, an air extraction head 312 and an elastic reset member 313. The bracket 311 has a first through hole 3111; Figure 4 (as shown by the middle arrow) one end of the vacuum head 312 is slidably connected to the first through hole 3111 so that the vacuum head 312 can slide relative to the bracket 311 in the first direction, and a fluid channel is provided in the vacuum head 312; the elastic return member 313 is located between the bracket 311 and the vacuum head 312 in the first direction; wherein, in the first direction, the other end of the vacuum head 312 opposite to the end connected to the bracket 311 has a vacuum port 3121 connected to the fluid channel.

[0083] One end of the exhaust head 312 is slidably connected to the first through hole 3111. It can be understood that one end of the exhaust head 312 is located in the first through hole 3111, and the radial displacement of the exhaust head 312 in the first through hole 3111 is limited by the hole wall of the first through hole 3111. At the same time, the exhaust head 312 is allowed to slide in the axial direction of the first through hole 3111. It should be noted that the exhaust head 312 can be in direct contact with the hole wall of the first through hole 3111, so that a force is directly applied to the exhaust head 312 through the hole wall of the first through hole 3111 to limit the radial movement of the exhaust head 312 in the first through hole 3111. Other parts can also be arranged between the first through hole 3111 and the exhaust head 312, so that the hole wall of the first through hole 3111 indirectly applies a force to the exhaust head 312 To limit the radial movement of the vacuum head 312 in the first through hole 3111; wherein, when the first direction is not a vertical direction, the vacuum head 312 can move along the first direction under the action of an external force and stop moving after the external force is removed, and when the first direction is a vertical direction, the movement of the vacuum head 312 along the first direction under the action of gravity can be limited by the friction force applied to the vacuum head 312. When the external force overcomes the combined force of gravity and the maximum static friction force, the vacuum head 312 can move in the first direction and stop moving under the action of the friction force after the external force is removed. It should be noted that the friction force can be directly applied by the wall of the first through hole 3111 to the vacuum head 312, and the friction force can also be applied by other parts between the first through hole 3111 and the vacuum head 312.

[0084] The other end of the vacuum head 312 opposite to the end connected to the bracket 311 has a vacuum port 3121 connected to the fluid channel. When the end of the vacuum head 312 with the vacuum port 3121 is directed toward the battery structure and abutted against the liquid injection valve of the battery structure, the liquid injection valve can be pushed open and the gas in the battery structure can be extracted into the fluid channel through the vacuum port 3121, thereby exhausting the battery.

[0085] The elastic return member 312 is located between the vacuum head 312 and the bracket 311. When the vacuum head 312 moves along the first direction, the elastic return member 313 can apply an elastic return force along the first direction to the vacuum head 312. When the battery structure is exhausted, the end of the vacuum head 312 with the vacuum port 3121 is abutted against the liquid injection port valve of the battery structure, so that the vacuum head 312 applies a force along the first direction to the liquid injection port valve to push the liquid injection port valve open. At the same time, the vacuum head 312 moves along the first direction under the action of the reaction force of the force and causes the elastic return member 313 to undergo elastic deformation. The elastic return member 313 applies an elastic return force along the first direction to the vacuum head 312, so that the vacuum head 312 is more tightly abutted against the pushed-open liquid injection port 23.

[0086] By enabling the vacuum head 312 to move in a first direction relative to the bracket 311 and providing an elastic reset member 313 between the vacuum head 312 and the bracket 311, when the vacuum head 312 abuts against the liquid injection port valve of the battery structure, the vacuum head 312 can move in the first direction relative to the bracket 311 and cause the elastic reset member 313 to undergo elastic deformation. When the vacuum head 312 abuts against the liquid injection port valve, the elastic reset force enables the vacuum head 312 to more tightly abut the opened liquid injection port, thereby enabling the vacuum head 312 to seal the opened liquid injection port, thereby reducing the possibility of the electrolyte in the battery structure leaking out of the battery structure and the fluid channel through the liquid injection port, and reducing the possibility of the electrolyte contaminating the outer surface of the battery structure.

[0087] Optionally, the fluid channel of the vacuum head 312 also has a gas-liquid separation structure. If gas containing electrolyte flows into the fluid channel, the gas and liquid can be separated by the gas-liquid separation structure, the gas can be discharged from the battery structure and the electrolyte obtained after separation can be re-injected into the battery structure.

[0088] In some embodiments, Figure 5 As shown, the air extraction component 310 further includes a sleeve 314, which is fixed to the first through hole 3111, and the sleeve 314 has a second through hole 3141, wherein one end of the air extraction head 312 is slidably connected to the second through hole 3141, so that the air extraction head 312 can be moved in a first direction (the first direction is as shown in FIG. Figure 5 The bracket 311 slides relative to the bracket 311.

[0089] The sleeve 314 passes through the first through hole 3111 and is fixedly connected to the bracket, that is, the radial movement of the sleeve 314 in the first through hole 3111 is limited by the force exerted by the hole wall of the first through hole 3111 on the sleeve 314, and the movement of the sleeve 314 in the first direction is limited by the friction between the hole wall and the sleeve 314; at the same time, the relative movement of the vacuum head 312 in the radial direction of the second through hole 3141 is limited by the abutment force between the vacuum head 312 and the hole wall of the second through hole 3141 of the sleeve 314, and the movement of the vacuum head 312 in the first direction is limited by the friction between the hole wall of the second through hole 3141 and the vacuum head 312.

[0090] By setting a sliding sleeve 314 fixed in the first through hole 3111 and slidably connecting the vacuum head 312 to the sliding sleeve 314, the wear of the vacuum head 312 on the hole wall of the first through hole 3111 is reduced, and the service life of the bracket 311 is extended. Moreover, the sliding sleeve 314 is detachably connected through the first through hole 3111, and the friction force applied by the vacuum head 312 is borne by the sliding sleeve 314, so that the sliding sleeve 314 can be more conveniently replaced after being worn; at the same time, since the sliding sleeve 314 is fixedly connected to the bracket 311, when it is necessary to install auxiliary structures such as an air duct or an air pump, the auxiliary structure can be fixedly connected to the bracket 311 through the sliding sleeve 314 and communicate with the fluid channel through the second through hole 3141.

[0091] In some embodiments, Figure 6 As shown, there are multiple air suction ports 3121, and the multiple air suction ports 312 are arranged at intervals around the first direction.

[0092] It can be understood that, at the end of the vacuum head 312, a plurality of vacuum ports 3121 are arranged at intervals around an axis parallel to the first direction. It should be noted that one end of the liquid injection port valve 24 is connected to the shell of the battery structure, and the other end of the liquid injection port valve 24 can be opened under the action of an external force, that is, when the vacuum head 312 pushes the liquid injection port valve 24 to open, the opening of the liquid injection port valve 24 is not located at the exact center of the liquid injection port but is located on one side of the central axis of the liquid injection port. If the vacuum port 3121 is set to the center of the end of the vacuum head 312, This will result in the air suction port 3121 not being able to face the opening of the liquid injection port valve 24, and even the air suction port 3121 not being able to communicate with the opening of the liquid injection port valve 24, thereby causing poor exhaust; by arranging multiple air suction ports 3121 at intervals around the first direction, at least a part of the air suction ports 3121 and the opening of the liquid injection port valve 24 are located on the same side, so that the air suction port 3121 can be communicated with the opening of the liquid injection port valve 24, and the total area of ​​the air suction port 3121 communicating with the opening of the liquid injection port valve 24 is increased, thereby improving the exhaust efficiency.

[0093] In some embodiments, in combination Figure 4 and Figure 7 The suction head 312 includes: a push rod 3122 and a suction nozzle 3123, wherein the push rod 3122 has a fluid passage, and one end of the push rod 3122 is slidably connected to the first through hole 3111 so that the push rod 3122 can be moved in a first direction (the first direction is as shown in FIG. Figure 7The suction nozzle 3123 is located at one end of the top rod 3122 having the vent 312, and is fixed to the side wall of the top rod 3122, and the end of the suction nozzle 3123 has an exhaust port 3121, wherein there are multiple vents 3124, and the multiple vents 3124 are arranged at intervals around the first direction, the vent 3124 is connected to the exhaust port 3121, and the suction nozzle 3123 is sealed from the side wall of the top rod 3122.

[0094] It can be understood that the circumferential arrangement of a plurality of vents 3124 at intervals at the end of the push rod 3122 enables at least part of the vents 3124 to be connected to the opening of the injection port valve 24. However, if the end of the push rod 3122 having the vents 3124 is directly in contact with the injection port valve 24, since the end has a plurality of vents 3124, stress concentration may occur in the structure between adjacent vents 3124, and even cause damage to the end face. By arranging a suction nozzle 3123 between the end face and the injection port valve 24 and arranging an air extraction port 3121 at the end of the suction nozzle 3123, and fixing the suction nozzle 3123 to the push rod 312 2, so that the force of opening the injection port valve 24 is directly borne by the suction nozzle 3123 and transmitted to the side wall of the push rod 3122, that is, the force will not be transmitted to the end face of the push rod 3122 with the vent 3124, thereby extending the service life of the end face, and at the same time, the opening of the injection port valve 24 can enter the suction nozzle 3123 from one side of the suction port 3121 and flow through the vent 3124 on at least one side into the fluid channel, thereby taking into account the exhaust efficiency, and at the same time, the suction nozzle 3123 and the side wall of the push rod 3122 are sealed, thereby reducing the possibility of gas leakage between the suction nozzle 3123 and the side wall of the push rod 3122. Among them, the vent 3124 can be directly connected to the fluid channel, and can also be indirectly connected to the fluid channel through other channels.

[0095] It should be noted that the fixation and sealing of the suction nozzle 3123 and the side wall of the top rod 3122 can be achieved in any way. For example, the fixed connection can be achieved by engaging a buckle with the side wall of the top rod 3122, and a sealing rubber is provided between the side wall of the top rod 3122 and the suction nozzle 3123 to achieve sealing; for example, the fixation and sealing can be achieved simultaneously by the close fit between the suction nozzle 3123 and the side wall of the top rod 3122.

[0096] In some embodiments, in combination Figure 7 and Figure 8The top rod 3122 includes: a connecting portion 3125 and a venting portion 3126, one end of the connecting portion 3125 is located in the first through hole 3111, and the venting portion 3126 is fixed to the other end opposite to the one end of the connecting portion. In the vertical direction, the size of the venting portion 3126 is smaller than the size of the connecting portion 3125, and a plurality of vents 3124 are arranged at intervals around the first direction at the end of the venting portion 3126, and the side wall of the venting portion 3126 has There is a third through hole 3127 connected to the fluid channel; wherein, the interior of the suction nozzle 3123 has a blind hole 3128 connected to the air suction port 3121, the blind hole 3128 forms a tight fit with the side wall of the connecting part 3125, the hole wall of the blind hole 3128 and the outer surface of the ventilation part 3126 surround to form a ventilation cavity 3129, the ventilation port 3124 connects the air suction port 3121 and the ventilation cavity 3129, and the third through hole 3127 connects the ventilation cavity 3129 with the fluid channel.

[0097] The blind hole 3128 forms a tight fit with the side wall of the connecting part 3125. It can be understood that, in a direction perpendicular to the first direction, the size of the connecting part 3125 is slightly larger than the size of the blind hole 3128, so that the hole wall of the blind hole 3128 can be close to the side wall of the connecting part 3125, and the suction nozzle 3123 and the push rod 3122 are fixed by the friction force between the blind hole 3128 and the connecting part 3125. At the same time, there is no gap between the hole wall of the blind hole 3128 and the side wall of the connecting part 3125, so that the opening of the blind hole 3128 is sealed by the side wall of the push rod 3122.

[0098] By making the size of the vent portion 3126 smaller than the size of the connecting portion 3125 in a direction perpendicular to the first direction, a gap is formed between the side wall of the vent portion 3126 and the hole wall of the blind hole 3128 while the blind hole 3128 can form a tight fit with the side wall of the connecting portion 3125, so that a vent cavity 3129 can be formed between the outer surface of the vent portion 3126 and the hole wall of the blind hole 3128; and the air extraction port 3121 is connected to the vent cavity 3129 through the vent hole 3124, and the vent cavity 3129 is connected to the fluid through the third through hole. Channel, that is, the vent 3124 is indirectly connected to the fluid channel through the vent cavity 2129 and the third through hole 3127, that is, the gas extracted by the suction port 3121 flows into the vent cavity 3129 through the vent 3124, and the gas in the vent cavity 3129 flows into the fluid channel through the third through hole 3127, so that the vent 3124 does not need to extend to the interior of the vent portion 3126, thereby reducing the influence of the vent 3124 on the structural strength of the vent portion 3126, and at the same time reducing the manufacturing cost and difficulty of the vent portion 3126.

[0099] In some embodiments, in combination Figure 7 and Figure 8The connecting portion 3125 has a limit block 31251 protruding from the side wall of the connecting portion 3125 , and in the first direction, a distance D1 between an end face of the limit block 31251 close to the ventilation portion 3126 and an end face of the ventilation portion 3126 having the ventilation opening 3124 is not greater than a hole depth D2 of the blind hole 3128 .

[0100] By setting the limit block 31251, when the external force on the suction nozzle 3123 is greater than the maximum static friction between the side wall of the blind hole 3128 and the connecting part 3125, the external force in the first direction is borne by the limit block 31251, thereby more reliably limiting the relative movement of the suction nozzle 3123 with respect to the top rod 3122 in the first direction. Moreover, the distance between the end face of the limit block 31251 close to the ventilation part 3126 and the end face of the ventilation part 3126 with the ventilation opening 3124 is greater than the hole depth of the blind hole 3128, thereby reducing the possibility that the hole wall of the blind hole 3128 abuts against the end face of the ventilation part 3126 with the ventilation opening 3124 due to the movement of the suction nozzle 3123 relative to the top rod 3122, thereby reducing the possibility that the end face of the ventilation part 3126 with the ventilation opening 3124 is subjected to the force in the first direction, thereby further extending the service life of the ventilation part 3126.

[0101] In some embodiments, Figure 7 As shown, the end of the suction nozzle 3123 has a sealing surface 31231, and the size of the sealing surface 31231 increases from the end away from the push rod 3122 to the end close to the push rod 3122 in the direction perpendicular to the first direction.

[0102] By providing a sealing surface 31231 on the end surface of the suction nozzle 3123, when the suction nozzle 3123 abuts against the liquid injection port valve, the portion of the suction nozzle 3123 with the sealing surface 31231 extends into the liquid injection port, so that the air extraction port 3121 can more directly extract the gas in the battery cell, and at the same time, the sealing surface 31231 is closely attached to the liquid injection port, thereby reducing the possibility of the electrolyte in the battery cell leaking out of the battery cell through the liquid injection port. In addition, since the end away from the top rod 3122 moves toward the end close to the top rod 3122, in the vertical direction, the suction nozzle 3123 is provided with a sealing surface 31231, and the sealing surface 31231 is provided with a sealing surface 31231. In the direction perpendicular to the first direction, the size of the sealing surface 31231 increases gradually to form a cone-like structure, so that when the suction nozzle 3123 is inserted into the liquid injection port, the side wall of the cone-shaped structure can guide the suction nozzle 3123, so that the suction nozzle 3123 is located at the center of the liquid injection port, and the sealing surface 31231 can abut against the hole wall of the liquid injection port at all parts of the circumference, thereby further improving the sealing effect of the suction nozzle 3123 on the liquid injection port.

[0103] In some embodiments, Fig. 9As shown, there are multiple first through holes 3111, and the exhaust assembly 310 has multiple exhaust heads 312, and each exhaust head 312 is slidably connected to the bracket 311 through each first through hole 3111. By providing multiple first through holes 3111, the exhaust heads 312 are respectively installed, so that multiple battery cells can be exhausted through the multiple exhaust heads 312, thereby improving the exhaust efficiency.

[0104] In some embodiments, Fig.10 As shown, a plurality of first through holes 3111 are arranged at intervals along the second direction (the second direction is as shown in FIG. Fig.10 The bracket 311 also has a deformation groove 3112 connected to the first through hole 3111, and the deformation groove is along the third direction (the third direction is as shown in FIG. Fig.10 The second direction is shown by the dotted arrows (shown by the dotted arrows) and extends to the edge of the bracket 311, wherein the second direction is parallel to the first direction (the first direction is shown by the dotted arrows). Fig.10 The third direction is perpendicular to the first direction and has a preset angle with the second direction.

[0105] It can be understood that the second direction and the third direction are located in a plane with the first direction as the normal, and the second direction is not parallel to the third direction. By providing a deformation groove 3112 connected to the first through hole 3111 and extending to the edge of the bracket 311, the first through hole 3111 can be more easily deformed radially, thereby facilitating Figure 4The exhaust head 312 is installed in the first through hole 3111. According to the relationship between the radial size of the exhaust head 312 and the radial size of the first through hole 3111, the deformation of the first through hole 3111 can be an expansion deformation or a contraction deformation. Specifically, when the radial size of the exhaust head 312 is smaller than the radial size of the first through hole 3111, a force is applied to the first through hole 3111 through the connecting part to cause the first through hole 3111 to contract, so that the hole wall of the first through hole 3111 can abut against the outer surface of the exhaust head 312, so that the first through hole 3111 can apply a friction force to the exhaust head 312, thereby realizing the slidable connection between the exhaust head 312 and the bracket 311, and the deformation groove 3112 can make the first through hole 3111 more easily produce contraction deformation; when the radial size of the exhaust head 312 is larger than the first Under the condition of the radial dimension of the through hole 3111, during the process of inserting the vacuum head 312 into the first through hole 3111, the first through hole 3111 and the deformation groove 3112 are elastically deformed to expand the first through hole 3111, and the first through hole 3111 can apply friction force to the vacuum head 312, so as to realize the slidable connection between the vacuum head 312 and the bracket 311; moreover, the deformation groove 3112 extends from the first through hole 3111 to the edge of the bracket 311, so as to further make the first through hole 3111 more susceptible to contraction deformation and expansion deformation, thereby further improving the installation convenience of the vacuum head 312; at the same time, the deformation groove 3112 extends along a third direction, which is not parallel to the arrangement direction of the first through holes 3111, thereby reducing the influence of the deformation of the first through hole 3111 on the adjacent first through hole 3111.

[0106] In some embodiments, Fig.11 As shown, the deformation groove 3112 includes: a first deformation portion 3113 and a second deformation portion 3114, the first deformation portion 3113 is connected to the first through hole 3111, and the deformation groove 3112 is deformed along the second direction (the second direction is as shown in FIG. Fig.11 The second deformation part 3114 is connected with the first deformation part 3113, and extends along the third direction (the third direction is shown in FIG. Fig.11 wherein the bracket 311 also has a threaded hole 3115, and the threaded hole 3115 extends from one side of the first deformation portion 3113 to the other side of the first deformation portion 3113 in a direction perpendicular to the second direction.

[0107] It can be understood that the first deformation portion 3113 and the second deformation portion 3114 extend in different directions respectively, thereby forming a deformation groove 3112 similar to an L shape. By forming the deformation groove 3112 into an L shape and providing a threaded hole 3115 that passes through the first deformation portion 3113, the first deformation portion 3113 can be caused to shrink and deform by screwing a bolt into the threaded hole 3115, thereby causing the first through hole 3111 to shrink and deform, that is, the first through hole 3111 is caused to shrink and deform more reliably through the bolt and the threaded hole 3115, thereby causing the first through hole 3111 to more reliably apply friction to the vacuum head 312, thereby improving the connection reliability between the vacuum head 312 and the bracket 311.

[0108] The embodiment of the present invention further provides an exhaust detection component, which is used to exhaust the gas in the battery structure and detect whether the exhaust process is normal. Fig.12 The structure of the exhaust gas detection component is exemplarily described. The exhaust gas detection component 320 includes: Figures 4 to 11 In any one of the pictures shown in the figure, the vacuum assembly 310, the vacuum device and the flow detection device 330, the vacuum device is connected to the vacuum head 312 through the vacuum pipeline 331, and the vacuum pipeline 331 is connected to the fluid channel in the vacuum head 312, and the flow detection device 330 is connected to the vacuum pipeline 331.

[0109] The exhaust device can generate negative pressure and, through the pressure difference between the exhaust device and the battery cell, extract the gas in the battery cell through the exhaust head 312 and the exhaust pipeline 331; the flow detection device 330 can detect the flow rate of the airflow in the exhaust pipeline 331, so as to detect whether the exhaust of the battery cell is normal through the flow rate of the airflow, that is, when the flow rate of the airflow is greater than the preset flow threshold, it is determined that the exhaust of the battery cell is normal; when the flow rate of the airflow is less than the preset flow threshold, it is determined that the injection port valve of the battery cell is not opened normally, resulting in the failure of the battery cell to be exhausted normally. It should be noted that the flow detection device 330 detects the What is measured is the total amount of gas flowing through the flow detection device 330 in the exhaust pipeline 331 during the exhaust process. Compared with detecting the maximum air pressure value in the exhaust pipeline 331 as the detection index, there is no need to detect the air pressure value in the exhaust pipeline 331 in real time, thereby reducing the difficulty of detection. It can be understood that the maximum air pressure value is a transient quantity, and it is necessary to detect and obtain the air pressure value in the exhaust pipeline 331 in real time during the exhaust process and determine whether the air pressure value is the maximum air pressure value; the total amount of gas is a process quantity, and the data can be obtained after the exhaust is completed to determine whether the exhaust is normal, thereby reducing the difficulty of detection.

[0110] In some embodiments, Fig.13As shown, the air extraction component 310 includes a sleeve 314, which passes through the first through hole 3111 and is fixedly connected to the bracket 311, and has a second through hole 3141 therein, wherein the air extraction pipeline 331 is fixedly connected to the sleeve 314, and the air extraction pipeline 331 is connected to the fluid channel through the second through hole 3141.

[0111] By means of the sliding sleeve 314 fixedly connected to the bracket 311, while the vacuum head 312 can be slidably connected to the bracket 311 through the sliding sleeve 314, the vacuum pipeline 331, the vacuum device and the flow detection device 330 and the bracket 311 remain relatively still, that is, the vacuum pipeline 331, the vacuum device and the flow detection device 330 do not move with the movement of the vacuum head 312, and the vacuum device is connected to the fluid channel in the vacuum head 312 through the second through hole 3141, thereby improving the air tightness between the vacuum device and the second through hole 3141.

[0112] In some embodiments, Fig.13 As shown, the exhaust detection component 320 also includes a buckle 332, and the exhaust pipeline 331 is detachably connected to the sleeve 314 through the buckle 332, and the flow detection device 330 is fixed to the exhaust pipeline 331. Specifically, the flow detection device 330 is detachably connected to the exhaust pipeline 331 through the buckle 332.

[0113] According to some embodiments of the present utility model, an exhaust detection device is provided. The exhaust detection device is applied to a battery structure. Fig.14 The structure of the exhaust detection device is exemplarily described. The exhaust detection device 30 is applied to a battery structure. The battery structure has a normally closed liquid injection port valve. The liquid injection port valve can be opened under the action of a first force. The first force is directed from the outside of the battery structure to the inside of the battery structure. The exhaust detection device 30 includes: a fixing device 340, a driving device 350, and Fig.12 or Fig.13 An exhaust detection assembly 320 is shown.

[0114] The fixing device 340 has a movable part 341 and a fixed part 342, the movable part 341 and the fixed part 342 are movably connected, the movable part 341 is connected to the battery structure, and the fixed part 342 is fixedly connected to the bracket 311; the driving device 350 is connected to the movable part 341, and is used to drive the movable part 341 to move relative to the vacuum head 312, so that the vacuum head 312 can apply a first force to the liquid injection port valve and connect the fluid channel with the liquid injection port.

[0115] By setting up the driving device 350, the vacuum head 312 can generate relative movement with the movable part 341 of the fixing device 340, and the battery structure is fixed to the movable part 341, so that the vacuum head 312 can apply a first force to the liquid injection valve 24 of the battery structure, and push the liquid injection valve 24 open by the first force, so that the fluid channel of the vacuum head 312 can be connected with the liquid injection port 23 of the battery structure. In this state, the exhaust detection component 320 can extract the gas generated in the battery structure during the formation process through the vacuum head 312, that is, it can discharge the gas generated in the battery structure with the liquid injection valve 24, thereby reducing the possibility that the gas in the battery structure affects the performance and safety performance of the battery; moreover, the exhaust detection component 320 can also detect the flow rate of the extracted gas, thereby determining whether the liquid injection valve 24 is opened normally and whether the gas in the battery structure is discharged normally through the total amount of the gas flow rate, thereby further improving the exhaust reliability of the battery structure.

[0116] An embodiment of the utility model also provides a method for manufacturing a battery cell, wherein the battery cell has a liquid injection port, and the liquid injection port is provided with a liquid injection port valve. During the manufacturing process, the liquid injection port valve can be opened under the action of a force from the outside to the inside, and after the manufacturing is completed, the liquid injection port valve is sealed in the form of a wax seal or a sealing nail.

[0117] In some embodiments, Fig.15 As shown, Fig.15 A schematic flow chart of a method for manufacturing a battery cell provided in an embodiment of the utility model, the steps of the manufacturing method include:

[0118] Step S101 : forming a battery structure by assembling and injecting liquid, and charging the battery structure at a preset voltage and for a preset time.

[0119] It can be understood that a battery shell with a accommodating cavity and an injection port is formed by winding and assembling the positive electrode sheet and the negative electrode sheet, and an electrolyte is injected into the accommodating cavity through the injection port to form a battery structure. The injection port of the battery structure has an injection port valve, and then the battery structure is charged with a preset voltage and a preset time, so that the ions in the electrolyte can react with the electrode material on the surface of the electrode sheet through an external current, thereby forming a solid electrolyte interface film on the surface of the electrode sheet. The process of forming a solid electrolyte interface film by charging can be called formation, and gas will be generated inside the battery structure during the formation process.

[0120] Step S102: exhaust the battery structure after charging and detect the exhaust status through exhaust detection equipment.

[0121] It can be understood that, through Fig.14The exhaust detection device shown exhausts the battery after formation, thereby exhausting the gas inside the battery generated during the formation process. Specifically, the liquid injection port valve is pushed open by the relative movement of the exhaust head of the exhaust detection device and the battery structure, and the gas in the battery structure is extracted through the exhaust head, thereby achieving the exhaust of the battery structure with the liquid injection port valve; moreover, the exhaust detection device also has an exhaust detection component that can detect the flow rate of the extracted gas, and determines whether the battery is exhausted normally through the flow rate of the extracted gas, thereby improving the reliability of the exhaust and reducing the influence of the gas generated during the formation process on the performance and safety performance of the battery cell.

[0122] Step S103, sealing the liquid injection port valve of the battery structure with normal exhaust to form a battery cell.

[0123] Specifically, the liquid filling valve is sealed by wax sealing or sealing nails, so that the liquid filling valve cannot be opened under the action of external force, thereby ensuring that the battery cell has a reliably closed liquid filling valve, thereby reducing the possibility of dust entering the battery cell and causing electrolyte leakage due to the opening of the liquid filling valve during the use of the battery cell.

[0124] By arranging a driving device, the vacuum head can generate relative movement with the movable part of the fixing device, and the battery structure is fixed to the movable part, so that the vacuum head can apply a first force to the liquid injection port valve of the battery structure, and push the liquid injection port valve open by the first force, so that the fluid channel of the vacuum head can be connected with the liquid injection port of the battery structure. In this state, the exhaust detection component can extract the gas generated in the battery structure during the formation process through the vacuum head, that is, it can discharge the gas generated in the battery structure with the liquid injection port valve, thereby reducing the possibility that the gas in the battery structure affects the performance and safety performance of the battery; moreover, the exhaust detection component can also detect the flow rate of the extracted gas, so as to determine whether the liquid injection port valve is opened normally and whether the gas in the battery structure is discharged normally through the total amount of the gas flow rate, thereby further improving the exhaust reliability of the battery structure.

[0125] According to some embodiments of the utility model, the present application also provides a battery, comprising the battery cell described in any of the above schemes.

[0126] According to some embodiments of the utility model, the utility model further provides an electrical device, comprising the battery described in any of the above schemes, and the battery is used to provide electrical energy to the electrical device.

[0127] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A vacuum assembly, characterized in that: The air extraction component comprises: A bracket having a first through hole; An air extraction head, one end of which is slidably connected to the first through hole in a first direction, so that the air extraction head can slide relative to the bracket in the first direction, and a fluid channel is provided in the air extraction head; An elastic reset member, located between the bracket and the vacuum head in the first direction; Wherein, in the first direction, the other end of the vacuum head opposite to the end connected to the bracket has a vacuum port connected to the fluid channel.

2. The air extraction assembly according to claim 1, characterized in that: The air extraction assembly also includes: A sliding sleeve, fixed to the first through hole, wherein the sliding sleeve has a second through hole; Wherein, the one end of the vacuum head is slidably connected to the second through hole, so that the vacuum head can slide relative to the bracket in the first direction.

3. The air extraction assembly according to claim 1 or 2, characterized in that: There are a plurality of air suction ports, and the plurality of air suction ports are spaced apart around the first direction.

4. The air extraction assembly according to claim 1 or 2, characterized in that: The vacuum head comprises: a push rod, wherein the fluid channel is provided in the push rod, one end of the push rod is slidably connected to the first through hole so that the push rod can slide relative to the bracket in the first direction, and the other end of the push rod opposite to the one end has a vent connected to the fluid channel; A suction nozzle, located at one end of the top rod having the vent, and fixed to the side wall of the top rod, and the end of the suction nozzle has the air extraction port; There are a plurality of vents, and the plurality of vents are spaced apart around the first direction. The vents are connected to the air suction port, and the suction nozzle is sealed from the side wall.

5. The air extraction assembly according to claim 4, characterized in that: The top rod comprises: a connecting portion, one end of which is located in the first through hole; a vent portion fixed to the other end opposite to one end of the connecting portion, wherein the size of the vent portion is smaller than that of the connecting portion in a direction perpendicular to the first direction, a plurality of vents are arranged at intervals at the end of the vent portion around the first direction, and a side wall of the vent portion has a third through hole communicating with the fluid channel; The inside of the suction nozzle has a blind hole connected to the air suction port, the blind hole forms a tight fit with the side wall of the connecting part, the hole wall of the blind hole and the outer surface of the ventilation part surround to form a ventilation cavity, and the air port connects the air suction port and the ventilation cavity, and the third through hole connects the ventilation cavity and the fluid channel.

6. The air extraction assembly according to claim 5, characterized in that: The connecting portion has a limit block protruding from a side wall of the connecting portion, and in the first direction, a distance between an end face of the limit block close to the vent portion and an end face of the vent portion having the vent is no greater than a depth of the blind hole.

7. The air extraction assembly according to claim 4, characterized in that: The end of the suction nozzle has a sealing surface, and the size of the sealing surface increases gradually from the end away from the push rod to the end close to the push rod in a direction perpendicular to the first direction.

8. The air extraction assembly according to claim 1, characterized in that: There are a plurality of the first through holes, and the air extraction assembly has a plurality of air extraction heads, each of which is slidably connected to the bracket through each of the first through holes.

9. The air extraction assembly according to claim 8, characterized in that: A plurality of the first through holes are arranged at intervals along the second direction, and the bracket further has a deformation groove communicating with the first through holes, and the deformation groove extends to the edge of the bracket along the third direction; The second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and has a preset angle with the second direction.

10. The air extraction assembly according to claim 9, characterized in that: The deformation groove comprises: A first deformation portion, connected to the first through hole and extending along a second direction; a second deformation portion, connected to the first deformation portion and extending along the third direction to an edge of the bracket; Wherein, the bracket further has a threaded hole, and along a direction perpendicular to the second direction, the threaded hole extends from one side of the first deformation portion to the other side of the first deformation portion.

11. An exhaust detection component, characterized in that: The exhaust detection component comprises: The exhaust assembly according to any one of claims 1 to 10; An air extraction device, connected to the air extraction head via an air extraction pipeline, and the air extraction pipeline is in communication with the fluid channel; A flow detection device is connected to the air extraction pipeline.

12. The exhaust gas detection assembly according to claim 11, characterized in that: The air extraction component comprises: A sliding sleeve passes through the first through hole and is fixedly connected to the bracket, and the sliding sleeve has a second through hole; Wherein, the air extraction pipeline is fixedly connected to the sliding sleeve, and the air extraction pipeline is communicated with the fluid channel through the second through hole.

13. An exhaust gas detection device, characterized in that: The exhaust detection device is applied to a battery structure, the battery structure having a normally closed liquid injection port valve, the liquid injection port valve being able to be opened under the action of a first force, the first force being directed from the outside of the battery structure to the inside of the battery structure; The exhaust gas detection device comprises: A fixing device, comprising a movable part and a fixed part, wherein the movable part is movably connected to the fixed part, the movable part is connected to the battery structure, and the fixed part is fixedly connected to the bracket; An exhaust gas detection assembly as claimed in claim 11 or 12; A driving device is connected to the movable part and is used to drive the movable part to move relative to the vacuum head, so that the vacuum head can apply the first force to the injection port valve and connect the fluid channel with the injection port.

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