Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, a liquid injection hole is formed in the shell, an opening and closing structure is arranged at the liquid injection hole, the opening and closing structure has a first state and a second state, in the first state, the liquid injection hole is opened to inject electrolyte into the shell, and in the second state, the opening and closing structure is opened to inject the electrolyte into the shell. And the liquid injection hole is closed to prevent the electrolyte from splashing. The utility model aims to reduce the possibility of electrolyte splashing in the process of finishing liquid injection and transferring of a battery monomer.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery cell, a battery device, and an electrical device. Background Technology

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source. Battery devices include battery cells, which need to be injected with electrolyte. After injection, the injection hole is sealed. During sealing, the injection hole is sealed by welding aluminum nails. However, during the process of completing the injection and transferring the electrolyte to the sealing device, the electrolyte in the injection hole may splash out, which not only affects the amount of electrolyte injected but also causes pollution. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which aims to reduce the possibility of electrolyte splashing during the process of filling and transferring the battery cell.

[0004] To address the aforementioned issues, in a first aspect, embodiments of this application provide a battery cell including a housing with an injection hole formed thereon. The injection hole has an opening and closing structure having a first state and a second state. In the first state, the injection hole is open to allow electrolyte to be injected into the housing. In the second state, the injection hole is closed to prevent the electrolyte from splashing out.

[0005] The effect of this embodiment is that it reduces the possibility of electrolyte splashing during the transfer of battery cells that have been filled and are to be sealed, ensures the amount of electrolyte used in the battery cell casing, and also prevents splashing contamination.

[0006] In one embodiment of the first aspect, the opening and closing structure includes an opening and closing part, which opens under the impact of the injection device or the electrolyte to place the opening and closing structure in the first state, and closes after the injection stops to place the opening and closing structure in the second state. The advantage of this embodiment is that the opening and closing of the opening and closing part depends entirely on whether injection is being performed, eliminating the need for manual operation of the opening and closing part, making it more convenient and improving efficiency.

[0007] In one embodiment of the first aspect, the opening and closing structure is a sealing element for closing the injection hole. The sealing element is a rubber element or an elastic element, and the opening and closing portion is a deformable and automatically recoverable through portion formed on the sealing element, the through portion penetrating both back sides of the sealing element in the axial direction of the injection hole. The advantage of this embodiment is that it provides a technical means to achieve opening and closing, adaptively opening and closing according to whether injection is being performed, avoiding manual operation and improving efficiency.

[0008] In one embodiment of the first aspect, the permeable portion is a cut-off portion, which has opposing cut surfaces at the break point. In the first state, the opposing cut surfaces are fitted together, and in the second state, a gap is formed between the opposing cut surfaces. The advantage of this embodiment is that opening and closing are achieved by utilizing the properties of a recoverable deformable material; the structure is simple and easy to operate, and the cost is low.

[0009] In one embodiment of the first aspect, the cut portion includes multiple cuts that intersect. The advantage of this embodiment is that the cut portion includes cuts that connect the two surfaces of the seal. Multiple cuts are possible, allowing for easy opening under force, reducing resistance. Furthermore, the intersecting cuts form a connected structure, further reducing opening resistance and enabling smooth liquid injection, especially under the impact of electrolyte.

[0010] In one embodiment of the first aspect, the multiple cuts are radially distributed, and the intersection line of the multiple cuts is the bisector of the cuts along their length. The effect of this embodiment is that the intersection line being the bisector of the cuts reduces the resistance during opening, allowing the divided parts of the seal to be opened with approximately the same force and with similar deformation. When the deformation is restored, each part can also restore its deformation to the same degree, resulting in a more balanced and even seal.

[0011] In one embodiment of the first aspect, the intersecting line of the multiple cuts is the central axis of the seal. The advantage of this embodiment is that the central axis is the center line running through the seal in the thickness direction, essentially a symmetrical center line. Designing the intersecting line to coincide with the axis ensures that the distances from the divided parts to the axis are equal, or that the structure is symmetrical, meaning they are located symmetrically on the seal. This results in approximately the same stress and plasticity at each point. When opened, the same opening force can create an approximate opening angle, making the opening more balanced. Simultaneously, the deformation recovery is synchronized, allowing for mutual contact and a relatively balanced sealing effect.

[0012] In one embodiment of the first aspect, the multiple cuts are in one or more shapes such as cross, star, T, I, earth, and king. This embodiment provides a cross-sectional shape formed by the multiple cuts, which can be selected as needed to create the cross-section of the aforementioned shape.

[0013] In one embodiment of the first aspect, the cut portion includes a single cut, which is straight, zigzag, or arc-shaped. Using a single cut reduces the number of processing steps and simplifies the processing.

[0014] In one embodiment of the first aspect, the outer edge shape of the opening and closing structure is one of a polygon, a circle, or an ellipse. This embodiment provides an opening and closing structure that can be selected from polygons, circles, ellipses, etc., to match the shape of the injection hole, facilitating the appropriate placement of the opening and closing structure at the injection hole.

[0015] In one embodiment of the first aspect, the housing includes a top cover structure, the injection hole is disposed on the top cover structure, and the opening and closing structure is bonded to the top cover structure. The advantage of this embodiment is that the bonding method is convenient and simple to operate, and a better sealing effect can be achieved through bonding.

[0016] In one embodiment of the first aspect, the housing includes a top cover structure, the liquid injection hole is disposed on the top cover structure, one of the opening / closing structure and the top cover structure has a recessed portion, and the other has a protrusion, the recessed portion and the protrusion being sealed together. The advantage of this embodiment is that the connection between the opening / closing structure and the top cover structure is achieved through a convex-concave overlapping method, making the contact surface of both concave and convex bent surfaces. This increases the contact area between the opening / closing structure and the top cover structure, resulting in a better sealing effect and effectively preventing electrolyte splashing.

[0017] In one embodiment of the first aspect, the opening and closing structure forms a recessed portion facing one side of the housing, the recessed portion being arc-shaped, and the through portion being formed at the recessed portion. The advantage of this embodiment is that the recessed portion facing the housing side, i.e., the side facing the electrolyte, effectively forms an arched surface structure on the side facing the electrolyte. This makes it more difficult for the through portion of the recessed portion to open from the inside of the housing to the outside, while it is easier to open from the outside of the housing to the inside. This makes it easier for the injection device or the electrolyte to impact open the cut portion during electrolyte injection, and after the electrolyte plate is injected, it is less likely for the electrolyte inside the housing to overflow through the through portion under vibration.

[0018] In one embodiment of the first aspect, the top cover structure includes a top cover sheet and a plastic part that adheres to the top cover sheet. The injection hole is located on the top cover sheet, and the plastic part has a flow-through portion communicating with the injection hole. The opening and closing structure is located on the side of the top cover sheet away from the plastic part, or between the top cover sheet and the plastic part. This embodiment provides a specific location for the opening and closing structure on the top cover structure, which can be selected according to specific needs.

[0019] Secondly, this application also provides a battery device, including the battery cell described in any of the embodiments.

[0020] Thirdly, this application also provides an electrical device, including the battery device described in the above embodiments.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the opening and closing structure provided in some embodiments of this application;

[0026] Figure 4 for Figure 3 Schematic diagram of the bottom structure of the openable / closed structure;

[0027] Figure 5 Schematic diagrams of the opening and closing structures provided in other embodiments of this application;

[0028] Figure 6 for Figure 5 Schematic diagram of the bottom structure of the openable / closed structure;

[0029] Figure 7 This is a schematic diagram of the top cover structure provided in some embodiments of this application;

[0030] Figure 8 This is an exploded structural diagram of the top cover structure provided in some embodiments of this application;

[0031] Figure 9 Exploded view of the top cover structure provided in other embodiments of this application;

[0032] Figure 10 for Figure 8 A sectional view of the top cover structure;

[0033] Figure 11 for Figure 10 Enlarged structural diagram at point A;

[0034] Figure 12 for Figure 9 A sectional view of the top cover structure;

[0035] Figure 13 for Figure 12 A magnified structural diagram at point B in the middle.

[0036] The reference numerals in the detailed embodiments are as follows:

[0037] 1000, vehicles;

[0038] 100. Battery assembly; 200. Controller; 300. Motor;

[0039] 10. Shell; 20. Top cover structure; 201. Top cover piece; 202. Plastic part; 30. Injection hole; 40. Opening and closing structure; 401. Cut section; 4011. Cut mark; 402. Recess; 403. Protrusion; 404. Inner recess; 50. Baffle; 60. Aluminum nail; 70. Current passage; 80. Battery cell. Detailed Implementation

[0040] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0048] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery application areas, the market demand is also constantly increasing.

[0049] A battery device may include multiple battery cells, each comprising an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell operates by the movement of metal ions between the positive and negative electrodes. The electrolyte serves as the carrier for ion transport within the battery, acting as a conductor between the positive and negative electrodes. Both the electrode assembly and the electrolyte are housed within a casing. After the electrode assembly is installed, the casing is covered by a top cover structure, and electrolyte is injected through the injection port in the top cover structure. After injection, the injection port is sealed, typically using welded aluminum studs. The studs are welded to the top cover structure to seal the injection port.

[0050] Welding aluminum nails is done using specialized equipment. After the battery cells have been injected with electrolyte, they are sequentially passed through the welding equipment by the transfer equipment for welding and sealing. During this process, the injection holes are open, which inevitably increases the risk of electrolyte splashing out. This not only reduces the amount of electrolyte inside the battery cells but also causes contamination.

[0051] Based on this, this application provides a battery cell that can solve the above problems and reduce the possibility of electrolyte splashing during the transfer process.

[0052] Please see Figures 2-13 This application provides an embodiment of a battery cell 80, including a housing 10, on which an injection hole 30 is formed, and an opening and closing structure 40 is provided at the injection hole 30. The opening and closing structure 40 has a first state and a second state. In the first state, the injection hole 30 is open to allow electrolyte to be injected into the housing 10. In the second state, the injection hole 30 is closed to prevent electrolyte from splashing out.

[0053] Specifically, the battery cell 80 includes a housing 10. The housing 10 has an injection hole 30 for filling the housing 10 with electrolyte, which is done through an injection nozzle. An opening / closing structure 40 is fixedly installed at the injection hole 30 and has a first state (open) and a second state (closed). During injection, it remains in the first state to complete the injection; after injection, it is in the second state, thus preventing electrolyte splashing during transfer.

[0054] The effect of this embodiment is that it reduces the possibility of electrolyte splashing during the transfer of the battery cell 80 after the electrolyte filling is completed and before sealing, ensures the amount of electrolyte in the battery cell 80 casing 10, and also prevents splashing pollution.

[0055] In some embodiments, such as Figures 3-6 The opening and closing structure 40 includes an opening and closing part. The opening and closing part opens under the impact of the liquid injection device or electrolyte to put the opening and closing structure 40 in a first state. The opening and closing part closes after the liquid injection stops to put the opening and closing structure 40 in a second state.

[0056] Specifically, this embodiment provides an opening and closing structure 40 including an opening and closing part. The first and second states of the opening and closing structure 40 are achieved by opening and closing the opening and closing part. The opening and closing of the opening and closing part is determined by whether liquid is injected. Specifically, when liquid is injected, the opening and closing part can be opened by the pushing of the injection device (which may be an injection nozzle) or by the impact of the electrolyte. The injection device can pass through the opening and closing part to inject liquid. Alternatively, when the injection device does not pass through the opening and closing part, the opening and closing part can be opened by the impact of the electrolyte to inject liquid. After the liquid injection is completed, the injection device is withdrawn or the impact of the electrolyte is eliminated, and the opening and closing part can automatically return to the closed state.

[0057] The advantage of this embodiment is that the opening and closing of the opening and closing part depends entirely on whether liquid is injected, eliminating the need for manual operation of the opening and closing part, making it more convenient and improving efficiency.

[0058] In some embodiments, such as Figures 3-6 The opening and closing structure 40 is a sealing element used to close the injection hole 30. The sealing element is a rubber element or an elastic element. The opening and closing part is a deformable and automatically recoverable through part opened on the sealing element. The through part penetrates the two back sides of the sealing element in the axial direction of the injection hole 30.

[0059] This embodiment provides a specific means of realizing the opening and closing of the opening and closing part depending on whether liquid injection is performed. The opening and closing structure 40 is a sealing element that closes the liquid injection hole 30. It can be a rubber part or an elastic part. The characteristic of a rubber part or an elastic part is that when it is deformed, it will slowly recover its original deformation until it returns to its original state. The sealing element in this embodiment can be a rubber gasket, etc. The opening and closing part is a through part on the sealing element. The so-called through part is a cut in the sealing element without removing material, and it connects the two back sides of the sealing element. The two back sides can be a top surface and a bottom surface. Since the sealing element is set at the liquid injection hole 30, when the top surface and the bottom surface are connected, liquid can be injected into the housing 10. During liquid injection, the through part is opened by the impact force of the liquid injection nozzle or the electrolyte to perform liquid injection. When liquid injection is not performed, the liquid injection nozzle is withdrawn or the electrolyte stops impacting, and the through part will automatically return to its original shape. The original shape refers to the through part being in a closed state.

[0060] The advantage of this embodiment is that it provides a technical means to achieve opening and closing, which can be adapted to whether or not liquid is injected, avoiding manual operation and improving efficiency.

[0061] In some embodiments, such as Figures 3-6 The through portion is a cut portion 401, and the cut portion 401 has opposing cut surfaces at the break point. In the first state, the opposing cut surfaces are attached to each other, and in the second state, a gap is formed between the opposing cut surfaces.

[0062] Specifically, due to the use of a material capable of recovering its deformation, the two opposing cut surfaces of the cut section 401 are in contact with each other when there is no external force, thus forming a closed state. When an external force is applied, they can form a non-contacted, separated state, creating a gap for electrolyte injection. The external force can be the impact force of the electrolyte or the thrust of the injection device.

[0063] The advantage of this embodiment is that it achieves opening and closing by utilizing the properties of recoverable deformable materials, resulting in a simple and easy-to-operate structure at a low cost. Furthermore, it should be noted that during the process of moving the battery cell 80 to the sealing device, the injection hole 30 remains facing upwards, and the electrolyte inside the housing 10 does not exert pressure on the cut portion 401. Splashing can be prevented when the opposing cut surfaces are in a close-fitting state, and a large bonding pressure is not required between the opposing cut surfaces.

[0064] In some embodiments, such as Figures 3-6 The cut portion 401 includes multiple cuts 4011, which intersect.

[0065] Specifically, the cut-off portion 401 includes a cut 4011, which connects the two sides of the seal. There can be multiple cuts 4011, so that it can be easily opened under force, reducing resistance. At the same time, multiple cuts 4011 intersect to form a connected structure, which further reduces the resistance to opening and allows for smooth liquid injection, especially under the impact of electrolyte, making it easier to open.

[0066] It should be noted that the cut 4011 in this embodiment is actually a planar structure that penetrates the seal. It has inner walls on both sides. When there are multiple cuts 4011, the multiple cuts 4011 can be designed to intersect, that is, the planar structures intersect and are connected, which makes it easier to reduce the resistance when opening.

[0067] In some embodiments, such as Figures 3-6 The multiple cuts 4011 are distributed radially, and the intersection line of the multiple cuts 4011 is the bisector of the cut 4011 along its length direction. The intersection line of the multiple cuts 4011 is the bisector of the cut 4011 along its length direction, and the intersection line passes through both surfaces of the cut portion 401 along its thickness direction. That is, the multiple cuts 4011 intersect to form a radial pattern centered on the intersection line.

[0068] Specifically, since the cut 4011 has the aforementioned planar structure, it can form intersecting lines. An intersecting line is a line simultaneously located on two cuts 4011. In this embodiment, this intersecting line is set as the bisector of the cut 4011, specifically, the bisector of the intersecting line on any one of the intersecting cuts 4011. A bisector refers to a line that can bisect the planar structure of the cut 4011. For example, when there are two cuts 4011, the cross-section when the two cuts 4011 intersect can be cross-shaped.

[0069] The effect of this embodiment is that the intersecting line is the bisector of the cut 4011, which can reduce the resistance when opening, so that each part of the divided seal can be opened with the same force as much as possible, and the deformation is similar. When the deformation is restored, each part can also restore the deformation to the same degree, so that each part fits and seals each other more evenly.

[0070] In some embodiments, such as Figures 3-6 The intersecting line of the multiple cuts 4011 is the central axis of the seal. Specifically, the seal can be a gasket-shaped or disc-shaped structure with a certain thickness. When the seal is a regular shape, such as a cylinder, it has a central axis. In this embodiment, the intersecting line is designed as the axis of the seal, or in other words, the intersecting line coincides with the axis.

[0071] The effect of this embodiment is that the central axis is the center line that runs through the seal in the thickness direction, which can be said to be the symmetrical center line. The intersecting line is designed to coincide with the axis, so that the distance from each of the divided parts to the axis is equal, or the structure is symmetrical, that is, it is located in a symmetrical position on the seal. The stress and plasticity of each part are approximately the same. When it is opened, an approximate opening angle can be formed under the same opening force, making the opening more balanced. At the same time, when the deformation is restored, it can also be restored as synchronously as possible, fitting together and achieving a relatively balanced sealing effect in all places.

[0072] In some embodiments, the multiple cuts 4011 are one or more of the following shapes: cross, rice, T, I, earth, and king.

[0073] This embodiment provides a cross-sectional shape formed by multiple cuts 4011. The multiple cuts 4011 together form the cross-section of the above shape, which can be selected as needed.

[0074] In some embodiments, the cut portion 401 includes a single cut 4011, which is straight, zigzag, or arc-shaped.

[0075] In some cases, the cut-off portion 401 can also adopt a single cut 4011, which reduces the number of processing steps and simplifies the processing difficulty. When the cut-off portion 401 includes a single cut 4011, the single cut 4011 can be straight, zigzag, or arc-shaped, specifically it can be in the form of a straight line, U-shape, V-shape, L-shape, S-shape, wave shape, or arc shape. A straight cut 4011 simplifies the processing steps. S-shaped, U-shaped, V-shaped, L-shaped, wave shape, or arc-shaped cuts 4011 reduce the resistance when opening, making it easier to open.

[0076] In some embodiments, the outer edge shape of the opening / closing structure 40 is one of polygon, circle, or ellipse.

[0077] Specifically, the opening and closing structure 40 is a sealing element. Its function is to be positioned at the injection hole 30 to seal it. Of course, if the opening and closing part is open, the injection hole 30 will not be sealed. Setting the opening and closing structure 40 to a shape that matches the injection hole 30 is more conducive to sealing it. The injection hole 30 is generally circular, so the outer edge shape of the opening and closing structure 40 provided in this embodiment can be circular. In some cases, when the injection hole 30 has other shapes, such as polygons or ellipses, the opening and closing structure 40 can also be selected accordingly.

[0078] This embodiment provides that the opening and closing structure 40 can be selected from polygons, circles, ellipses, etc., which can be adapted to the shape of the injection hole 30, so that the opening and closing structure 40 can be adapted to be set at the injection hole 30.

[0079] In some embodiments, such as Figure 7 , Figure 8 , Figure 10 and Figure 11 The housing 10 includes a top cover structure 20, an injection hole 30 is provided on the top cover structure 20, and an opening and closing structure 40 is bonded to the top cover structure 20.

[0080] A top cover structure 20 is provided on the housing 10. The top cover structure 20 is used to seal the electrode assembly and electrolyte inside the housing 10. The injection hole 30 is opened on the top cover structure 20. The opening and closing structure 40 is set at the injection hole 30 and seals the injection hole 30. Therefore, the opening and closing structure 40 is connected to the top cover structure 20. A ring of adhesive can be provided on the opening and closing structure 40, and then the opening and closing structure 40 is bonded to the top cover structure 20. Alternatively, a ring of adhesive can be provided on the top cover structure 20, and the opening and closing structure 40 is bonded thereto. The injection hole 30 can be set into the shape of a stepped hole, with a larger diameter at the top and a smaller diameter at the bottom. The opening and closing structure 40 can be bonded to the stepped surface of the stepped hole, so that the opening and closing structure 40 is coaxial with the injection hole 30.

[0081] The advantage of this embodiment is that the bonding method is convenient and simple to operate, and a better sealing effect can also be achieved by means of bonding.

[0082] In some embodiments, such as Figure 7 , Figure 9 , Figure 12 and Figure 13 The housing 10 includes a top cover structure 20, an injection hole 30 is provided on the top cover structure 20, one of the opening and closing structure 40 and the top cover structure 20 is provided with a recess 402, and the other is provided with a protrusion 403, and the recess 402 and the protrusion 403 are sealed together.

[0083] Specifically, in addition to bonding the opening / closing structure 40 and the top cover structure 20 together, an overlapping seal can also be used. A recessed portion 402 is provided on the opening / closing structure 40, and a protruding portion 403 is provided on the top cover structure 20. The recessed portion 402 of the opening / closing structure 40 is aligned with the protruding portion 403 on the top cover structure 20 and then inserted to achieve a sealed connection between the two. Alternatively, a protruding portion 403 is provided on the opening / closing structure 40, and a recessed portion 402 is provided on the top cover structure 20. The same insertion method can also achieve a sealed connection.

[0084] The shapes of the protrusion 403 and the recess 402 can be matched. The protrusion 403 and the recess 402 can adopt a ring structure so that they fit perfectly in the circumferential direction and avoid leakage.

[0085] The advantage of this embodiment is that the connection between the opening / closing structure 40 and the top cover structure 20 is achieved through a convex-concave overlapping sealing method, so that the contact surface between the two is a concave-convex bent surface, the contact area between the opening / closing structure 40 and the top cover structure 20 is increased, the sealing effect is better, and the splashing of electrolyte can be effectively prevented.

[0086] In some embodiments, such as Figure 5 and Figure 6 The opening and closing structure 40 has an inner recess 404 recessed towards one side of the shell 10. The inner recess 404 is arc-shaped, and the through part is formed at the inner recess 404.

[0087] Specifically, a recessed portion 404 may be formed on the surface of the opening and closing structure 40. When the opening and closing structure 40 is in the installed state, the recessed portion 404 is recessed towards the housing 10 of the battery cell 80. The recessed surface can be an arc-shaped surface, specifically a spherical surface. Then, the through portion or the above-mentioned cutting portion 401 is formed at the recessed portion 404.

[0088] The effect of this embodiment is that the concave portion 404 faces the side of the housing 10, that is, the side facing the electrolyte, which is equivalent to forming an arched surface structure on the side facing the electrolyte. This makes it more difficult for the cut portion 401 of the concave portion 404 to open from the inside of the housing 10 to the outside of the housing 10, while it is easier to open from the outside of the housing 10 to the inside of the housing 10. In this way, when injecting electrolyte, the injection device or electrolyte can more easily impact and open the cut portion 401. After the electrolyte plate is injected, the electrolyte inside the housing 10 is less likely to overflow through the cut portion 401 under vibration.

[0089] In some embodiments, such as Figures 8-13 The top cover structure 20 includes a top cover sheet 201 and a plastic part 202 that is attached to the top cover sheet 201. An injection hole 30 is provided on the top cover sheet 201. The plastic part 202 is provided with a flow passage 70 that communicates with the injection hole 30. The opening and closing structure 40 is provided on the side of the top cover sheet 201 away from the plastic part 202, or between the top cover sheet 201 and the plastic part 202.

[0090] Specifically, the top cover structure 20 includes a top cover sheet 201 and a plastic part 202. The plastic part 202 is located on the lower side of the top cover sheet 201 and forms an integral structure with the top cover sheet 201. When the top cover structure 20 is connected to the housing 10, it can be connected to the housing 10 through the plastic part 202. On the one hand, it reduces the hard contact between the top cover sheet 201 and the housing 10, and on the other hand, it has a good insulation effect. Furthermore, the plastic part 202 is a stable material and will not react with the substances inside the housing 10.

[0091] An injection hole 30 is provided on the top cover plate 201. Since the plastic part 202 cannot block the injection of electrolyte, a flow passage 70 is provided on the plastic part 202. After the electrolyte passes through the injection hole 30, it will enter the housing 10 through the flow passage 70. The flow passage 70 is provided with a baffle 50. The baffle 50 receives the electrolyte flowing in from the injection hole 30. Then the electrolyte flows into the housing 10 from the horizontal openings on both sides of the baffle 50. The baffle 50 is equivalent to buffering the electrolyte to a certain extent, so as to prevent the electrolyte from rushing into the housing 10 at high speed and causing a large disturbance.

[0092] The opening / closing structure 40 has two positions that can be set, such as... Figure 10 and Figure 11 The first is the upper surface of the top cover plate 201, specifically the part around the upper port of the injection hole 30 on the top cover plate 201. The injection hole 30 can be a stepped hole, that is, a stepped structure is formed on the surface of the top cover plate 201, and the opening and closing structure 40 can be set on the stepped surface, which can be bonded. After the injection is completed, the injection hole 30 is completely sealed by welding aluminum nails 60, and the aluminum nails 60 are pressed onto the opening and closing structure 40. Figure 12 and Figure 13The second location could be between the lower surface of the top cover 201 and the plastic part 202, specifically around the lower port of the corresponding injection hole 30 on the top cover 201. The opening / closing structure 40 can be pressed between the top cover 201 and the plastic part 202, and located between the injection hole 30 and the flow passage 70. The opening / closing structure 40 can overlap the plastic part 202 through a convex-concave fit structure while simultaneously pressing between the top cover 201 and the plastic part 202. After injection, an aluminum nail 60 can still be welded to the upper end of the injection hole 30. In both the first and second locations, the opening / closing structure 40 and the injection hole 30 are coaxially arranged.

[0093] When the opening and closing structure 40 is set in the first position, that is, when it is set at the upper port of the injection hole 30, the effect is that electrolyte is not easily left on the surface of the opening and closing structure 40, and the injection device can directly pass through the through part of the opening and closing part to directly inject the liquid. When the opening and closing structure 40 is set in the second position mentioned above, the opening and closing structure 40 is not easily damaged by the injection device or burned by the welded aluminum nail 60.

[0094] This embodiment provides the specific location of the opening and closing structure 40 on the top cover structure 20, which can be selected according to specific needs.

[0095] like Figure 2 This application also provides an embodiment of a battery device 100, including a battery cell 80 provided in any of the embodiments.

[0096] This application also provides an electrical device having the battery device 100 provided in the above embodiments, that is, an electrical device that uses the battery device 100 as a power source.

[0097] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 80, which are connected in series, parallel, or mixed connection via a busbar. Mixed connection refers to a combination of series and parallel connections.

[0098] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 80.

[0099] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 80 together. As another example, a battery module can be formed by bundling multiple battery cells 80 together with cable ties.

[0100] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0101] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0102] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 80 to the housing.

[0103] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0104] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0105] In some embodiments, the housing may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing may be at least a portion of the floor of the vehicle 1000, or a portion of the housing may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0106] like Figure 1 This application also provides an electrical device, including the battery device 100 provided in any of the above embodiments.

[0107] The technical solutions described in this application are applicable to various electrical devices using battery device 100, including vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0108] The battery device 100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can use power systems equipped with the battery device 100 disclosed in this application, which helps improve the reliability of the electrical devices.

[0109] For ease of explanation, the following embodiments will use a vehicle 1000 as an example of the electrical device provided in this application.

[0110] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0111] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The device includes a housing with an injection hole formed thereon. The injection hole has an opening and closing structure with a first state and a second state. In the first state, the injection hole is open to allow electrolyte to be injected into the housing. In the second state, the injection hole is closed to prevent the electrolyte from splashing out.

2. The battery cell of claim 1, wherein, The opening and closing structure includes an opening and closing part. The opening and closing part opens under the impact of the liquid injection device or the electrolyte to put the opening and closing structure in the first state. The opening and closing part closes after the liquid injection stops to put the opening and closing structure in the second state.

3. The battery cell of claim 2, wherein, The opening and closing structure is a sealing element used to close the injection hole. The sealing element is a rubber element or an elastic element. The opening and closing part is a deformable and automatically recoverable through part formed on the sealing element. The through part penetrates the two back sides of the sealing element in the axial direction of the injection hole.

4. The battery cell of claim 3, wherein, The transparent portion is a cut-off portion, and the cut-off portion has opposing cut surfaces at the break point. In the first state, the opposing cut surfaces are fitted together, and in the second state, a gap is formed between the opposing cut surfaces.

5. The battery cell as described in claim 4, characterized in that, The cut portion includes multiple cuts, and the multiple cuts intersect.

6. The battery cell of claim 5, wherein, The multiple cuts are distributed radially, and the intersection line of the multiple cuts is the bisector of the cut in its length direction.

7. The battery cell of claim 5, wherein the cathode comprises a lithium metal oxide. The intersecting line of the multiple cuts forms the central axis of the seal.

8. The battery cell of claim 5, wherein, The cuts described above are in one or more of the following shapes: cross, rice, T, I, earth, and king.

9. The battery cell of claim 4, wherein, The cut portion includes a single cut, which is straight, zigzag, or arc-shaped.

10. The battery cell of any one of claims 1-9, wherein, The outer edge shape of the opening and closing structure is one of polygon, circle, or ellipse.

11. The battery cell of any one of claims 3-9, wherein, The housing includes a top cover structure, the liquid injection hole is provided on the top cover structure, and the opening and closing structure is bonded to the top cover structure.

12. The battery cell of any one of claims 3-9, wherein, The housing includes a top cover structure, the liquid injection hole is provided on the top cover structure, one of the opening and closing structure and the top cover structure is provided with a recess, and the other is provided with a protrusion, the recess and the protrusion are sealed together.

13. The battery cell of claim 3 or 4, wherein, The opening and closing structure has a recessed portion that is recessed to one side of the housing. The recessed portion is arc-shaped, and the through portion is formed in the recessed portion.

14. The battery cell as described in claim 11, characterized in that, The top cover structure includes a top cover sheet and a plastic part that is attached to the top cover sheet. The injection hole is provided on the top cover sheet. The plastic part is provided with a flow passage that communicates with the injection hole. The opening and closing structure is provided on the side of the top cover sheet away from the plastic part, or between the top cover sheet and the plastic part.

15. A battery device characterized by comprising: Includes the battery cell described in any one of claims 1-14.

16. An electrical device, comprising: Includes the battery device as described in claim 15.

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