Battery device

Abstract

The application relates to a battery device, which comprises a shell, a battery cell and a top cover mechanism, the top cover mechanism comprising a top cover sheet, a lower plastic, a pole and a fixing piece, the pole penetrating through the top cover sheet, the lower plastic being arranged on the side of the top cover sheet facing the shell, the lower plastic being provided with a through hole corresponding to the pole, the fixing piece being connected to the lower plastic, the tab on the battery cell being fixed on the side of the fixing piece facing the lower plastic, the fixing piece being used for abutting the tab on the pole through the through hole, and the pole and the tab being welded and fixed. Through the technical scheme, the problem that splashes generated in the welding process of the battery device in the related art easily enter the battery cell can be solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices. Background Technology

[0002] In the assembly process of related battery devices, the tabs and adapter plates are usually ultrasonically welded first, then the adapter plates are laser welded to the terminals, and finally the battery cells are placed into the housing cavity. The top cover mechanism is mounted on the housing and welded to it, thus completing the assembly of the battery device. However, during the assembly process, the laser welding of the adapter plates and terminals is performed before the battery cells are placed in the housing cavity. The welded parts of the adapter plates and terminals, as well as the battery cells, are exposed on the outside. Metal spatter generated by laser welding can easily enter the exposed battery cells, causing micro-short circuit hazards, and in severe cases, leading to thermal runaway. Utility Model Content

[0003] Therefore, it is necessary to provide a battery device that addresses the problem that welding spatter can easily enter the battery cell during the assembly process of related battery devices.

[0004] A battery device includes a housing, a battery cell, and a top cover mechanism.

[0005] The top cover mechanism includes a top cover plate, a lower plastic piece, a terminal post, and a fixing component. The terminal post passes through the top cover plate. The lower plastic piece is located on the side of the top cover plate facing the housing. The lower plastic piece has through holes corresponding to the terminal post. The fixing component is connected to the lower plastic piece. The tabs on the battery cell are fixed to the side of the fixing component facing the lower plastic piece. The fixing component is used to abut the tabs against the terminal post through the through holes. The terminal post and the tabs are welded and fixed.

[0006] In one embodiment, the tab includes a connecting portion and a bending portion. One end of the connecting portion is electrically connected to the battery cell, and the other end of the connecting portion is connected to the bending portion. The side of the bending portion away from the connecting portion is electrically connected to the electrode post, and a fixing member is disposed between the connecting portion and the bending portion.

[0007] In one embodiment, the fastener includes:

[0008] The fixing unit is fixedly connected to the lower plastic part;

[0009] The conductive unit is fixed on the side of the fixed unit near the bending part. The conductive unit is welded and fixed to the bending part and electrically connected.

[0010] In one embodiment, the fixing unit is provided with a fixing hole, and the fixing member further includes:

[0011] The heat insulation unit is fixedly installed in the fixing hole and abuts against the conductive unit.

[0012] In one embodiment, a snap-fit ​​element is provided on the lower plastic and around the through hole, and the edge of the fixing unit snaps into the snap-fit ​​element.

[0013] In one embodiment, the pole includes a column, and a groove is formed at one end of the column facing outward from the housing. The bottom of the groove forms a connecting unit. The side of the connecting unit facing away from the groove is connected to the electrode tab. The thickness of the connecting unit along the first direction is H1, and the thickness of the column as a whole along the first direction is H2, where 0.4≤H1 / H2≤0.6.

[0014] In one embodiment, the side of the engagement unit facing the groove is provided with multiple grooves.

[0015] In one embodiment, the pole post further includes an abutment portion and a riveting portion surrounding the outside of the pole body, with the top cover plate sandwiched between the abutment portion and the riveting portion.

[0016] In one embodiment, the column is square in shape, and each side of the column facing the outer end of the shell is formed with a riveting part, and each side of the column forming the riveting part is parallel.

[0017] In one embodiment, the battery device further includes:

[0018] A sealing mechanism is installed between the pole and the top cover plate.

[0019] In the aforementioned battery assembly, the tabs of the battery cell are fixedly connected to a fixing component, which is then mounted on a top cover mechanism. The tabs abut against the terminals on the top cover mechanism. The battery cell and fixing component are placed within a receiving cavity. The top cover mechanism is welded to the casing, and welding is performed from the outside of the battery assembly at the point where the terminals abut against the tabs. This design prevents metal spatter from entering the receiving cavity and the battery cell, thereby reducing the risk of micro-short circuits and thermal runaway. Furthermore, the fixed connection between the tabs and the fixing component effectively prevents displacement of the tabs during assembly. The connection between the fixing component and the top cover mechanism ensures that the tabs remain in the position corresponding to the connection holes, allowing for accurate abutment between the terminals and tabs, reducing the possibility of misalignment, and thus improving the reliability of the welding and fixing of the terminals and tabs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery device.

[0021] Figure 2 for Figure 1 Cross-sectional view of the device shown.

[0022] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0023] Figure 4This is a schematic diagram of the structure where the lower plastic part mates with the bending section.

[0024] Figure 5 for Figure 4 Exploded view of the device shown.

[0025] Figure 6 This is a structural diagram showing the combination of the lower plastic, fixing unit, and heat insulation unit.

[0026] Figure 7 This is a schematic diagram of the structure of the plastic.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Shell;

[0029] 20. Battery cell; 21. Electrode; 211. Connecting part; 212. Bending part;

[0030] 30. Top cover mechanism;

[0031] 31. Top cover plate; 311. Connecting hole;

[0032] 32. Bottom plastic part; 321. Through hole; 322. Snap-fit ​​part;

[0033] 33. Pole post; 331. Connecting unit; 332. Abutting part; 333. Riveting part;

[0034] 34. Fasteners;

[0035] 341, Fixing unit; 3411, Fixing hole;

[0036] 342. Conductive unit; 343. Thermal insulation unit;

[0037] 40. Sealing mechanism. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0044] See Figures 1 to 5 This application provides a battery device, which includes a housing 10, a battery cell 20, and a top cover mechanism 30. The housing 10 has a receiving cavity and an opening that communicate with each other. The battery cell 20 is disposed in the receiving cavity and includes tabs 21.

[0045] The top cover mechanism 30 includes a top cover plate 31, a lower plastic 32, a pole post 33, and a fixing member 34. The pole post 33 passes through the top cover plate 31. The lower plastic 32 is located on the side of the top cover plate 31 facing the housing 10. The lower plastic 32 and the pole post 33 are respectively provided with through holes 321. The fixing member 34 is connected to the lower plastic 32. The electrode tab 21 on the battery cell 20 is fixed to the side of the fixing member 34 facing the lower plastic 32. The fixing member 34 is used to abut the electrode tab 21 against the pole post 33 through the through hole 321. The pole post 33 and the electrode tab 21 are welded and fixed.

[0046] It is understood that the tabs 21 on the battery cell 20 are divided into positive and negative tabs, and the posts 33 on the top cover 31 are correspondingly divided into positive and negative posts. The positive tab is connected to the positive post, and the negative tab is connected to the negative post. In some embodiments, the post 33 extends into the through hole 321 and abuts against the tab 21. In other embodiments, the tab 21 extends into the through hole 321 and abuts against the post 33.

[0047] In some embodiments, the lower plastic 32 has through holes 321 corresponding to the positive and negative tabs, and the tabs 21 are connected to the corresponding terminals 33 through the corresponding through holes 321. In other embodiments, the positive and negative tabs can be connected to the corresponding positive and negative terminals through the same through hole 321. In some embodiments, the positive and negative terminals are each provided with a fixing member 34, and the positive tab abuts against the positive terminal through the corresponding fixing member 34, and the negative tab abuts against the negative terminal through the corresponding fixing member 34. In other embodiments, only one fixing member 34 may be provided, but the part of the fixing member 34 that connects to the positive tab and the part that connects to the negative tab must be insulated to avoid short circuits.

[0048] By applying the technical solution of this application, the tab 21 of the battery cell 20 is fixedly connected to the fixing member 34, and the fixing member 34 is installed on the top cover mechanism 30, so that the tab 21 abuts against the terminal post 33 on the top cover mechanism 30. The battery cell 20 and the fixing member 34 are placed in the receiving cavity, and the top cover mechanism 30 is welded to the shell 10. The position where the terminal post 33 abuts against the tab 21 is welded from the outside of the battery device. This arrangement can prevent metal spatter from splashing into the receiving cavity and the battery cell 20, thereby reducing the occurrence of micro-short circuit hazards and thermal runaway accidents. Furthermore, since the tab 21 is fixedly connected to the fixing member 34, the tab 21 can be effectively prevented from shifting during assembly. And since the fixing member 34 is connected to the top cover mechanism 30, the tab 21 can be kept in the position corresponding to the connection hole 311, thereby enabling the terminal post 33 and the tab 21 to accurately abut against each other, reducing the possibility of misalignment between the terminal post 33 and the tab 21, and thus improving the reliability of the welding and fixing of the terminal post 33 and the tab 21.

[0049] See Figure 3 The tab 21 includes a connecting portion 211 and a bent portion 212. One end of the connecting portion 211 is electrically connected to the battery cell 20, and the other end of the connecting portion 211 is connected to the bent portion 212. The side of the bent portion 212 away from the connecting portion 211 is electrically connected to the terminal post 33. A fixing member 34 is disposed between the connecting portion 211 and the bent portion 212. With this configuration, there is no need to connect the tab 21 and the terminal post 33 through an adapter piece, avoiding the adapter piece occupying the top space of the battery cell 20. At the same time, it is convenient for the fixing member 34 to support the tab 21, preventing the tab 21 from collapsing, and it is also convenient to increase the height of the tab 21, making it easier for the tab 21 to abut against the terminal post 33 in the connecting hole 311.

[0050] See Figure 3 The fixing component 34 includes a fixing unit 341 and a conductive unit 342. The fixing unit 341 is fixedly connected to the lower plastic 32. The conductive unit 342 is fixed to the side of the fixing unit 341 near the bending portion 212, and is welded and electrically connected to the bending portion 212. This arrangement allows the fixing unit 341 and the conductive unit 342 to effectively abut against the tab 21, preventing displacement of the tab 21. It also facilitates welding and fixing of the fixing component 34 to the bending portion 212, ensuring the stability of the bending portion 212 fixed to the fixing component 34.

[0051] In this application, the fixing unit 341 is disposed between the connecting part 211 and the bending part 212.

[0052] In this application, the conductive unit 342 is made of metal, so the tensile strength of the conductive unit 342 is much higher than that of the fixed unit, and it can withstand the repeated deformation stress after the tab 21 is folded, thus avoiding fatigue fracture.

[0053] It is understandable that the material of the conductive unit 342 is the same as that of the corresponding welding tab and post.

[0054] In this application, the conductive unit 342 and the bending portion 212 are fixed by ultrasonic welding. The spatter generated during the welding process of the conductive unit 342 and the bending portion 212 is much smaller than the spatter generated by the laser welding of the adapter plate and the electrode post 33. Therefore, the possibility of metal spatter entering the exposed cell 20 at this stage is extremely low.

[0055] In some embodiments, the fixing unit 341 is made of PP board, which can ensure the insulation performance and high temperature resistance of the fixing unit 341.

[0056] See Figure 6 The fixing unit 341 is provided with a fixing hole 3411. The fixing member 34 also includes a heat insulation unit 343, which is fixedly disposed in the fixing hole 3411 and abuts against the conductive unit 342. With this arrangement, the heat insulation unit 343 can play a heat insulation role during the welding of the electrode post 33, effectively blocking heat transfer, avoiding local overheating of the battery cell 20, and extending the service life of the battery cell 20.

[0057] In some embodiments, the heat insulation unit 343 is a high-temperature tape.

[0058] In some embodiments, the heat insulation unit 343 is a ceramic plate, which is snapped into the fixing hole 3411 by a tenon and mortise structure, and the ceramic plate is interference-fitted with the inner wall of the fixing hole 3411.

[0059] See Figure 2 , Figure 3 and Figure 7 The top cover plate 31 has a connecting hole 311 that penetrates the top cover plate 31, and the pole post 33 is disposed through the connecting hole 311. A lower plastic piece 32 is disposed on the side of the top cover plate 31 near the housing 10. The lower plastic piece 32 has a through hole 321 that is opposite to the connecting hole 311. The bent portion 212 is electrically connected to the pole post 33 through the through hole 321, and the lower plastic piece 32 is connected to the fixing member 34. With this configuration, the bent portion 212 on the tab 21 and the pole post 33 abut and are welded together through the through hole 321 and the connecting hole 311. The lower plastic piece 32, the fixing member 34, and the top cover plate 31 cooperate to fix the tab 21 to the side near the pole post 33, facilitating welding between the pole post 33 and the tab 21.

[0060] In some embodiments, the bent portion 212 on the tab 21 is laser welded to the pole post 33.

[0061] See Figure 3A snap-fit ​​element 322 is provided on the lower plastic 32 and around the through hole 321, and the edge of the fixing unit 341 snaps into the snap-fit ​​element. This configuration enables quick installation and fixation of the lower plastic 32 and the fixing unit 341 without the need for additional connecting structures, simplifying the assembly process and improving production assembly efficiency.

[0062] In some embodiments, the snap-fit ​​element 322 is a snap hook.

[0063] In some embodiments, the lower plastic 32 is made of plastic material. This arrangement ensures the insulation performance of the lower plastic 32, prevents short circuits in the battery device, and also prevents leakage from the battery device.

[0064] The pole post 33 includes a column body with a groove at one end facing outwards from the housing. The bottom of the groove forms a connecting unit 331. The side of the connecting unit 331 facing away from the groove is connected to the pole tab 21. The thickness of the connecting unit 331 along the first direction is H1, and the overall dimension of the column body along the first direction is H2, where 0.4 ≤ H1 / H2 ≤ 0.6. (See reference...) Figure 3 The X direction is the first direction. This configuration, by creating grooves, reduces the overall weight of the electrode post 33 and facilitates welding between the electrode post 33 and the tab 21. When H1 / H2 is less than 0.4, the resistance of the bonding unit 331 is too high, easily leading to localized overheating. When H1 / H2 is greater than 0.6, it increases the ineffective weight of the electrode post 33 and reduces the welding effect. Therefore, setting H1 / H2 between 0.4 and 0.6 ensures overcurrent protection while preventing excessive resistance in the bonding unit 331, and simultaneously guarantees the welding effect between the electrode post 33 and the tab 21. Specifically, H1 is set between 1.2mm and 1.8mm, and H2 is 3mm.

[0065] In this application, the pole post 33 is a square structure as a whole, and the connecting unit 331 is also a square structure. This can increase the welding area between the pole post 33 and the tab 21, and ensure the welding effect and overcurrent safety.

[0066] The joining unit 331 has multiple grooves on the side facing the groove. This arrangement allows the anti-reflective layer and grooves to reduce laser reflection and enhance laser absorption, thereby improving welding efficiency. Furthermore, the grooves can prevent disordered diffusion of the molten pool and reduce defects such as porosity and lack of fusion, thus improving welding quality.

[0067] In some embodiments, a plurality of grooves are arranged in an array on the side of the engagement unit 331 facing the groove.

[0068] In some embodiments, the depth of the trench is set between 50 μm and 100 μm, and the spacing between adjacent trenches is set between 0.2 mm and 0.5 mm.

[0069] Specifically, the support unit 52 also includes an abutment portion 332 and a riveting portion 333 surrounding the outside of the column. The riveting portion 333 is located on the side of the top cover plate 31 facing outward from the housing 10, and the top cover plate 31 is sandwiched between the abutment portion 332 and the riveting portion 333. The pole post 33 passes through the connection hole 311 on the top cover plate 31, and the edge of the connection hole 311 is sandwiched between the abutment portion 332 and the riveting portion 333, thereby realizing the connection between the pole post 33 and the top cover plate 31.

[0070] In some embodiments, the column is generally square, and each side of the column facing outward from the housing 10 has a riveting portion 333, and all sides of the column with the riveting portion are parallel. This arrangement increases the welding area between the pole post 33 and the external structure, eliminating the need for additional adapter plates. The external structure may specifically be electrical equipment, etc.

[0071] An anti-oxidation layer is provided on the side of the riveting part 333 that is away from the housing 10.

[0072] In some embodiments, an antioxidant layer is provided on the negative electrode post, but not on the positive electrode post.

[0073] In some embodiments, the antioxidant layer may be a nickel layer.

[0074] Specifically, the lower plastic piece 32 and the top cover piece 31 are engaged in a snap-fit ​​configuration. In some embodiments, one of the lower plastic piece or the top cover piece has a protrusion, and the other has a corresponding groove. The protrusion engages with the groove, thereby connecting the lower plastic piece and the top cover piece.

[0075] See Figure 3 The battery assembly also includes a sealing mechanism 40, which is disposed between the terminal post 33 and the top cover plate 31. This arrangement can prevent battery leakage and ensure the overall sealing of the battery assembly.

[0076] In some embodiments, the sealing mechanism 40 is made of plastic material, and the plastic deformation properties of plastic can help distribute pressure evenly during riveting, thereby improving the tightness of the connection.

[0077] In some embodiments, the battery cell 20 is provided with two sets of tabs 21, and the tabs 21 of the two sets of battery cells 20 extend from both ends of the fixing member 34 into the space between the fixing member 34 and the pole post 33. The tabs 21 of the two sets of battery cells 20 are arranged side by side without overlap, so as to avoid the tabs 21 after stacking being inconvenient to connect with the fixing member 34.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery device comprising a housing (10), a battery cell (20), and a top cover mechanism (30), characterized in that, The top cover mechanism (30) includes a top cover plate (31), a lower plastic (32), a pole (33), and a fixing member (34). The pole (33) passes through the top cover plate (31). The lower plastic (32) is disposed on the side of the top cover plate (31) facing the housing (10). The lower plastic (32) has a through hole (321) corresponding to the pole (33). The fixing member (34) is connected to the lower plastic (32). The tab (21) on the battery cell (20) is fixed on the side of the fixing member (34) facing the lower plastic (32). The fixing member (34) is used to abut the tab (21) against the pole (33) through the through hole (321). The pole (33) and the tab (21) are welded and fixed.

2. The battery device according to claim 1, characterized in that, The tab (21) includes a connecting part (211) and a bending part (212). One end of the connecting part (211) is electrically connected to the battery cell (20), and the other end of the connecting part (211) is connected to the bending part (212). The side of the bending part (212) away from the connecting part (211) is electrically connected to the pole post (33). The fixing member (34) is disposed between the connecting part (211) and the bending part (212).

3. The battery device according to claim 2, characterized in that, The fastener (34) includes: The fixing unit (341) is fixedly connected to the lower plastic (32); The conductive unit (342) is fixed to the side of the fixed unit (341) near the bending part (212), and the conductive unit (342) is welded and fixed to the bending part (212) and electrically connected.

4. The battery device according to claim 3, characterized in that, The fixing unit (341) is provided with a fixing hole (3411), and the fixing member (34) further includes: A heat insulation unit (343) is fixedly disposed in the fixing hole (3411) and abuts against the conductive unit (342).

5. The battery device according to claim 3, characterized in that, A snap-fit ​​element (322) is provided on the lower plastic (32) and around the through hole (321), and the edge of the fixing unit (341) snaps into the snap-fit ​​element (322).

6. The battery device according to claim 1, characterized in that, The pole post (33) includes a column body, and a groove is provided at one end of the column body facing outward from the housing (10). The bottom of the groove forms a connecting unit (331). The side of the connecting unit (331) facing away from the groove is connected to the pole tab (21). The thickness of the connecting unit (331) along the first direction is H1, and the thickness of the column body as a whole along the first direction is H2, 0.4≤H1 / H2≤0.

6.

7. The battery device according to claim 6, characterized in that, The joining unit (331) has a plurality of grooves on the side facing the groove.

8. The battery device according to claim 6, characterized in that, The pole post (33) also includes an abutment portion (332) and a riveting portion (333) surrounding the outside of the post body, and the top cover plate (31) is held between the abutment portion (332) and the riveting portion (333).

9. The battery device according to claim 8, characterized in that, The column is square in shape, and each side of the column facing the outer end of the shell (10) forms the riveting part (333), and each side of the column forming the riveting part (333) is parallel.

10. The battery device according to any one of claims 1 to 9, characterized in that, The battery device also includes: A sealing mechanism (40) is disposed between the pole post (33) and the top cover plate (31).

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