Battery and electric device

Abstract

The utility model provides a kind of battery, battery includes electric core, shell and sealing nail, shell is equipped with chamber and liquid injection hole, the inner surface of shell is equipped with first slot, first slot is around liquid injection hole, electric core is located in chamber;Sealing nail is used to seal liquid injection hole, sealing nail includes shaft portion, inner connecting portion and protruding portion, shaft portion is worn in liquid injection hole, inner connecting portion is connected in one end of shaft portion and located in chamber, inner connecting portion is protruded along radial direction relative to shaft portion, protruding portion is connected to the side surface of inner connecting portion towards shaft portion, protruding portion is embedded in first slot.The sealing effect of the sealing nail of the battery is better.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] During battery manufacturing, electrolyte is first injected into the battery casing through the filling hole, and then the filling hole is sealed with a sealing pin. The sealing pin prevents the electrolyte inside the casing from leaking into the external environment, and also prevents water, dust, or other debris from entering the casing. The sealing effect of the sealing pin has a significant impact on the battery's performance stability and lifespan. Improving the sealing effect of the sealing pin is a problem that the industry is currently eager to solve. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery in which the sealing pin provides a better seal for the liquid injection hole.

[0004] This utility model also proposes an electrical device that includes the above-mentioned battery.

[0005] A battery according to a first aspect of the present invention includes: a battery cell; a housing having a chamber and an injection hole, the inner surface of the housing having a first groove surrounding the injection hole, the battery cell being located within the chamber; and a sealing pin for sealing the injection hole, the sealing pin including a shaft portion, an inner connecting portion, and a protrusion, the shaft portion passing through the injection hole, the inner connecting portion being connected to one end of the shaft portion and located within the chamber, the inner connecting portion protruding radially relative to the shaft portion, the protrusion being connected to a side surface of the inner connecting portion facing the shaft portion, and the protrusion being embedded in the first groove.

[0006] The battery according to the first aspect embodiment of this utility model has at least the following beneficial effects: assuming the electrolyte in the chamber leaks from the injection hole to the outside of the casing, the electrolyte will flow along the gap between the sealing pin and the casing. Because this application has a first groove, and the protrusion is embedded in the first groove, even if a gap occurs between the sealing pin and the casing (e.g., due to assembly errors, loose sealing pins, etc.), the tortuosity of the gap between the sealing pin and the casing is high, the resistance to electrolyte flow along the gap is high, electrolyte leakage is less likely, and the sealing effect of the sealing pin is better.

[0007] According to some embodiments of the present invention, the inner surface of the outer shell is further provided with a second groove, the first groove is located at the bottom wall of the second groove, and the inner connecting part is embedded in the second groove.

[0008] According to some embodiments of the present invention, the sealing nail further includes an outer connecting part, which is connected to the other end of the shaft. The outer connecting part protrudes radially relative to the shaft. The outer surface of the housing is provided with a third groove, and the outer connecting part is embedded in the third groove.

[0009] According to some embodiments of the present invention, the protrusion and the first groove are both annular; and / or, the inner connecting part is disc-shaped; and / or, the outer connecting part is disc-shaped.

[0010] According to some embodiments of the present invention, the battery further includes a sealing ring, and the protrusion presses the sealing ring into the first groove.

[0011] According to some embodiments of the present invention, the end of the shaft located inside the cavity is open, and the end of the shaft located outside the cavity is closed.

[0012] According to some embodiments of the present invention, the shaft portion is provided with a pressure relief marking at one end outside the cavity.

[0013] According to some embodiments of this utility model, both ends of the shaft are closed ends.

[0014] According to some embodiments of the present invention, the outer shell includes a main body and a cover plate, the main body and the cover plate are connected to each other and define the chamber, the liquid injection hole is disposed on the main body or on the cover plate; the electrode terminal is electrically connected to the battery cell, the electrode terminal is connected to the cover plate, the liquid injection hole is disposed at the end of the main body away from the cover plate, and the cover plate and the sealing pin are respectively connected to the two ends of the main body.

[0015] The electrical device according to a second aspect of the present invention includes a battery as described in the first aspect embodiment.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the battery according to the first embodiment of the present invention; Figure 2 This is a cross-sectional view of the bottom of the main body of the first embodiment; Figure 3 This is a cross-sectional view of the bottom of the battery in the first embodiment; Figure 4 This is a schematic diagram of the sealing pin in the first embodiment; Figure 5 This is a schematic diagram of the sealing pin of the first embodiment from another perspective; Figure 6 This is a cross-sectional view of the bottom of the battery in the second embodiment; Figure 7 This is a cross-sectional view of the bottom of the battery in the third embodiment.

[0018] Reference numerals: 101-Battery, 102-Electrode terminal, 103-Outer shell, 104-Cover plate, 105-Main body, 106-Cavity, 107-First groove, 108-Second groove, 109-Injection hole, 110-Third groove, 111-Sealing pin, 112-Shaft, 113-Inner connection part, 114-Protrusion, 115-Outer connection part, 116-Pressure relief mark, 117-Sealing ring. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Figure 1A battery 101 according to a first embodiment of the present invention is shown. The battery 101 includes a casing 103, electrode terminals 102, and a battery cell (not shown). The casing 103 has a chamber 106 in which the battery cell is housed. The casing 103 includes a main body 105 and a cover plate 104. The top of the main body 105 may have an opening, allowing the battery cell to enter and exit the main body 105 through the opening. The cover plate 104 covers the opening, and the cover plate 104 and the main body 105 together enclose the chamber 106. The electrode terminals 102 are connected to the cover plate 104. One end of the electrode terminals 102 is located outside the chamber 106, and the other end is located inside the chamber 106 and electrically connected to the battery cell. Specifically, the electrode terminals 102 may be directly welded or bonded to the positive electrode tab of the battery cell, or both the electrode terminals 102 and the positive electrode tab of the battery cell may be welded to a current collector. The negative electrode tab of the battery cell can be welded to the bottom of the main body 105, and an insulating element (not shown) is provided between the outer periphery of the electrode terminal 102 and the cover plate 104. The insulating element separates the electrode terminal 102 and the cover plate 104 to prevent the electrode terminal 102 and the cover plate 104 from being short-circuited.

[0024] The housing is also provided with a liquid injection port 109, for example, such as Figure 2 As shown, an electrolyte injection port 109 is located on the main body 105. The electrolyte injection port 109 communicates with the chamber 106, allowing electrolyte to enter the chamber 106 through the injection port 109 during the manufacturing process of the battery 101. The battery 101 also includes a sealing pin 111. Both the sealing pin 111 and the outer casing 103 can be made of metal, such as steel, aluminum alloy, etc. Figure 3 As shown, the sealing pin 111 is used to seal the injection hole 109. Specifically, the sealing pin 111 includes a shaft portion 112, an inner connecting portion 113, and a protrusion 114. The shaft portion 112 passes through the injection hole 109, the inner connecting portion 113 is connected to one end of the shaft portion 112 and located within the chamber 106, the inner connecting portion 113 protrudes relative to the shaft portion 112, and the inner connecting portion 113 protrudes radially (radially relative to the shaft portion 112). The protrusion 114 is connected to the side surface of the inner connecting portion 113 facing the shaft portion 112. Figure 2 and Figure 3 As shown, the inner surface of the outer shell 103 is provided with a first groove 107, the first groove 107 surrounds the liquid injection hole 109, and the protrusion 114 is embedded in the first groove 107.

[0025] Assuming the electrolyte in chamber 106 leaks from injection hole 109 to outside outer casing 103, the electrolyte will flow along the gap between sealing pin 111 and outer casing 103. Because this application provides a first groove 107, and the protrusion 114 is embedded in the first groove 107, even if a gap occurs between sealing pin 111 and outer casing 103 (e.g., due to assembly errors, loosening of sealing pin 111, etc.), the gap between sealing pin 111 and outer casing 103 has a high degree of tortuosity, resulting in high resistance to electrolyte flow along the gap. This makes electrolyte leakage less likely, and the sealing effect of sealing pin 111 is better.

[0026] Furthermore, in this embodiment, the sealing pin 111 can be connected to the main body 105 of the outer casing 103 by riveting. Compared to connecting the sealing pin 111 to the outer casing 103 by welding, riveting can avoid the occurrence of weld porosity, which affects the welding strength, thereby avoiding poor sealing performance of the sealing pin 111 due to poor welding.

[0027] The welding method places high demands on the fit between the welded parts. After liquid injection, a certain amount of gas will exist inside the outer casing 103. If the main body 105 of the outer casing 103 is welded to the sealing pin 111, the gas inside the cell will prevent the sealing pin 111 from effectively and tightly fitting the casing during welding. The internal gas will push up the sealing pin 111, resulting in incomplete and ineffective welding, causing welding defects and affecting the cell yield. Moreover, due to the pressure difference between the inside and outside of the welding point during laser welding, pores are easily generated during welding, which cannot guarantee the effectiveness of welding and sealing. The characteristics of laser welding also produce certain welding pores during welding, affecting the effectiveness of welding and sealing. Therefore, in this embodiment, not using welding to connect the sealing pin 111 to the main body 105 of the outer casing 103 is beneficial to improving the sealing effect of the sealing pin 111 on the liquid injection hole 109.

[0028] like Figure 2 and Figure 3 As shown, the inner surface of the outer casing 103 is also provided with a second groove 108 (the second groove 108 is specifically located on the inner surface of the main body 105), the first groove 107 is located on the bottom wall of the second groove 108, and the inner connecting part 113 is embedded in the second groove 108. The positioning fit between the second groove 108 and the inner connecting part 113 helps to improve the ease of assembly between the sealing pin 111 and the outer casing 103. In addition, the second groove 108 on the inner surface of the outer casing 103 also helps to increase the degree of tortuosity of the gap between the sealing pin 111 and the outer casing 103, thereby improving the sealing effect of the sealing pin 111.

[0029] like Figure 2 and Figure 3As shown, the sealing pin 111 also includes an external connecting portion 115, which is connected to the other end of the shaft portion 112. The external connecting portion 115 protrudes radially relative to the shaft portion 112 and is located outside the chamber 106. The surface of the outer casing 103 is provided with a third groove 110, and the external connecting portion 115 is embedded in the third groove 110. The positioning fit between the third groove 110 and the external connecting portion 115 facilitates the assembly of the sealing pin 111 and the outer casing 103. Furthermore, the embedding of the sealing pin 111 in the third groove 110 can also reduce the protrusion of the external connecting portion 115 relative to the outer surface of the outer casing 103, improving the surface flatness of the battery 101. To further improve the surface flatness of the battery 101, the bottom surface of the external connecting portion 115 and the bottom surface of the main body 105 can be flush.

[0030] Figure 4 and Figure 5 The shape of the sealing pin 111 is shown. The protrusion 114 is annular, and correspondingly, the first groove 107 is also annular. The inner connecting portion 113 and the outer connecting portion 115 are both disc-shaped. These shapes help reduce the shape complexity of the sealing pin 111, thus reducing its processing difficulty and cost. In some other embodiments not shown, the first groove 107 and the protrusion 114 may also be rectangular, and the inner connecting portion 113 and the outer connecting portion 115 may be rectangular; this arrangement also helps reduce the shape complexity of the sealing pin 111.

[0031] like Figure 3 As shown, in the first embodiment, the end of the shaft 112 located inside the chamber 106 (top end) is open, while the end of the shaft 112 located outside the chamber 106 (bottom end) is closed. In this configuration, the end of the shaft 112 located outside the chamber 106 can act as a pressure relief valve for the battery 101. If the temperature and pressure inside the chamber 106 become too high, the end of the shaft 112 located outside the chamber 106 can rupture, thereby releasing pressure from the chamber 106 and preventing a more serious explosion of the battery 101.

[0032] like Figure 3 As shown, in order to enable the shaft portion 112 to break when the pressure in the chamber 106 is too high, the shaft portion 112 is also provided with a pressure relief line 116. The strength at the pressure relief line 116 is lower than that at other parts of the shaft portion 112. The pressure relief line 116 can break smoothly when the pressure in the chamber 106 is high, thereby achieving the pressure relief function. From a top view, the pressure relief line 116 can be arc-shaped, circular, X-shaped, or a straight line. The shapes of the pressure relief line 116 are not listed here.

[0033] like Figure 1As shown, in this embodiment, the injection hole 109 is located at the end of the main body 105 away from the cover plate 104, and the cover plate 104 and the sealing pin 111 are respectively connected to the two ends of the main body 105. Since the cover plate 104 in this embodiment does not need to be provided with the injection hole 109 and the sealing pin 111, this design is suitable for batteries 101 with a small area of ​​cover plate 104 and a small radial dimension of main body 105.

[0034] In this embodiment, the battery 101 is a cylindrical battery 101. In other embodiments not shown, the battery 101 may also be rectangular or other shapes. The liquid injection hole 109 may also be located on the cover plate 104 of the housing 103 instead of the main body 105 of the housing 103. This reduces the number of holes and openings in the main body 105 and helps to improve the strength of the main body 105.

[0035] Figure 6 The battery 101 according to a second embodiment of the present invention is shown. The main difference between the second embodiment and the first embodiment is that both ends of the shaft portion 112 in the second embodiment are closed, and the shaft portion 112 is solid rather than hollow. This arrangement can improve the structural strength of the sealing nail 111 itself, thereby improving the overall strength of the battery 101.

[0036] Figure 7 A battery 101 according to a third embodiment of the present invention is shown. The main difference between the third embodiment and the first embodiment is that the battery 101 in the third embodiment further includes a sealing ring 117. The sealing ring 117 can be made of rubber or other elastic materials. The protrusion 114 presses the sealing ring 117 into the first groove 107. Due to the addition of the sealing ring 117 in the third embodiment, the sealing effect of the liquid injection hole 109 is better. During the manufacturing and assembly process of the battery 101, the sealing ring 117 can be placed in the first groove 107 first, and then the sealing pin 111 and the main body 105 of the outer casing 103 can be riveted together. After riveting, the protrusion 114 of the sealing pin 111 presses the sealing ring 117 tightly into the first groove 107.

[0037] The battery 101 in any of the above embodiments can be used in electrical devices, such as mobile phones, tablets, smartwatches, and other electronic devices. The electrical device can also be a vehicle, and multiple batteries 101 can be packaged into a battery pack to power the vehicle.

[0038] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A battery, characterized in that, include: Battery cell; The outer casing has a chamber and a liquid injection port, and the inner surface of the outer casing has a first groove surrounding the liquid injection port. The battery cell is located in the chamber. A sealing pin is used to seal the injection hole. The sealing pin includes a shaft, an inner connecting part, and a protrusion. The shaft passes through the injection hole. The inner connecting part is connected to one end of the shaft and located in the cavity. The inner connecting part protrudes radially relative to the shaft. The protrusion is connected to the side surface of the inner connecting part facing the shaft. The protrusion is embedded in the first groove.

2. The battery according to claim 1, characterized in that, The inner surface of the outer shell is also provided with a second groove, the first groove is located on the bottom wall of the second groove, and the inner connecting part is embedded in the second groove.

3. The battery according to claim 1, characterized in that, The sealing nail also includes an external connecting part, which is connected to the other end of the shaft. The external connecting part protrudes radially relative to the shaft. The outer surface of the housing is provided with a third groove, and the external connecting part is embedded in the third groove.

4. The battery according to claim 3, characterized in that, Both the protrusion and the first groove are annular; And / or, the inner connecting portion is disc-shaped; And / or, the external connecting part is disc-shaped.

5. The battery according to claim 1, characterized in that, The battery also includes a sealing ring, and the protrusion presses the sealing ring into the first groove.

6. The battery according to claim 1, characterized in that, The shaft portion is open at one end inside the cavity and closed at the other end outside the cavity.

7. The battery according to claim 6, characterized in that, The shaft portion has a pressure relief marking at one end located outside the cavity.

8. The battery according to claim 1, characterized in that, Both ends of the shaft are closed.

9. The battery according to any one of claims 1 to 8, characterized in that, The outer casing includes a main body and a cover plate, the main body and the cover plate are connected to each other and define the chamber, and the injection hole is disposed on the main body or the cover plate; The battery also includes electrode terminals, which are electrically connected to the battery cell and to the cover plate. The liquid injection hole is located at the end of the main body away from the cover plate, and the cover plate and the sealing pin are respectively connected to the two ends of the main body.

10. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 9.

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