Top cover assembly, battery monomer, and assembling method of top cover assembly

Abstract

The application relates to a top cover assembly, a battery monomer, a battery cell and an assembling method of the top cover assembly. The top cover assembly comprises a top cover and an insulating piece. The insulating piece comprises a base plate and a turnover plate. A buckle assembly and an elastic piece are arranged between the base plate and the turnover plate. The buckle assembly comprises a first buckle piece and a second buckle piece. The first buckle piece is provided with a pre-buckling first buckling part and a stable buckling second buckling part. The elastic piece is compressible and is arranged between the first end of the base plate and the buckle assembly. Under different compression amounts of the elastic piece, the second buckle piece can be switched from the pre-buckling first buckling part of the first buckle piece to the stable buckling second buckling part of the first buckle piece. The application will not affect the production rhythm and the yield due to the low buckling success rate of the first buckle piece and the second buckle piece.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a top cover assembly, a battery cell, and a method for assembling the battery cell and the top cover assembly. Background Technology

[0002] With social development and progress, lithium batteries have rapidly entered the public eye as a new energy source and are widely used in various fields. As an energy storage device, batteries are gradually being recognized by society and are developing rapidly, with battery performance and safety receiving increasing attention. Among these, inverted insertion of the tabs poses a significant threat to battery safety.

[0003] Chinese invention patent CN112018278A discloses a battery top cover and a power battery. The battery top cover includes a top cover sheet, a positive terminal, a negative terminal, and a plastic part. The top cover sheet has a positive terminal hole and a negative terminal hole, with the positive terminal fitting into the positive terminal hole and the negative terminal fitting into the negative terminal hole. The plastic part includes a main body and wing plates. The main body abuts against the inner wall of the top cover sheet. There are two wing plates, one end of which is rotatably connected to both ends of the main body, and the other ends of which can be snapped onto the main body. The wing plates have a snap-fit ​​position and a release position. In the snap-fit ​​position, the other end of the wing plate is snapped onto the main body and is parallel to the main body. In the release position, the other end of the wing plate is detached from the main body. During the assembly process of the above-mentioned battery top cover, problems often occur where the wing plates cannot be snapped on or pop open after snapping on. Failure to snap on the wing plates leads to a slow production pace, while failure to snap on the wing plates leads to an increased defect rate. Summary of the Invention

[0004] To address this, the present invention provides an assembly method for a top cover assembly, a battery cell and a battery cell, and a top cover assembly, which can solve the problems of difficulty in fastening the flip plate and automatic pop-out after fastening, thus ensuring production rhythm and yield rate.

[0005] To solve the above-mentioned technical problems, the present invention provides a top cover assembly, comprising:

[0006] The top cover is equipped with pole posts;

[0007] An insulating component includes a substrate and a flip plate, the substrate being stacked with the top cover; the flip plate is disposed on the side of the substrate away from the top cover, the flip plate having a first end, the first end of the flip plate being flip-connected to the substrate;

[0008] A latching assembly is provided between the substrate and the flip plate. The latching assembly includes a first latching member and a second latching member. One of the substrate and the flip plate is provided with the first latching member, and the other is provided with the second latching member. The first latching member has a first engaging portion that is pre-engaged with the second latching member and a second engaging portion that is securely engaged with the second engaging member.

[0009] An elastic element is also provided between the substrate and the flip plate. The elastic element is compressible and located between the first end of the substrate and the snap-fit ​​assembly. Under different compression amounts of the elastic element, the second snap-fit ​​member can switch from pre-engaging with the first snap-fit ​​member's first snap-fit ​​portion to securely engaging with the second snap-fit ​​member's second snap-fit ​​portion.

[0010] Furthermore, when the second fastener is pre-engaged with the first engaging portion of the first fastener, the elastic deformation of the elastic element is L1, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X1; when the second fastener is securely engaged with the second engaging portion of the first fastener, the elastic deformation of the elastic element is L2, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X2, L2 < L1, and X2 < X1.

[0011] Furthermore, when the second fastener is pre-engaged with the first engaging portion of the first fastener, the elastic deformation of the elastic element is L3, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X3; when the second fastener is securely engaged with the second engaging portion of the first fastener, the elastic deformation of the elastic element is L4, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X4, where L4 > L3 and X4 > X3.

[0012] Furthermore, there are two second latching portions, with the first latching portion located between the two second latching portions, and the first latching portion connecting the two second latching portions.

[0013] Furthermore, the second fastener is provided with a slot, both ends of which penetrate the second fastener along the first direction; the end of the second fastener connected to the first fastener is provided with a notch, which communicates with the slot; when the second fastener is pre-engaged with the first engagement portion of the first fastener, at least a portion of the first engagement portion extends into the slot through the notch and is slidably engaged with the slot; when the second fastener is securely engaged with the second engagement portion of the first fastener, at least a portion of the second engagement portion cannot extend out of the slot through the notch and is slidably engaged with the slot.

[0014] Furthermore, the length of the slot in the first direction is W1, and the length of the first engaging part in the first direction is W2. During the transition from pre-engaging with the first engaging part of the first fastener to securely engaging with the second engaging part of the first fastener, the elastic deformation of the elastic element is ΔL, where ΔL > W2 - W1 + 0.5 mm.

[0015] Furthermore, in the second direction, the minimum width of the latch is M1, the width of the slot is M2, the width of the first latching part is M4, and the width of the second latching part is M3, wherein -0.1mm < M4 - M1 < 0.1mm, M3 - M1 > 0.4mm, M3 ≤ M2, and the second direction is perpendicular to the first direction.

[0016] Furthermore, the first snap-fit ​​portion and the second snap-fit ​​portion are connected sequentially along a first direction; the first snap-fit ​​portion has a first side surface and a second side surface that are arranged opposite to each other and parallel to each other, and the distance between the first side surface and the second side surface is M4; the second snap-fit ​​portion has an abutting surface that can abut against the second fastener, the abutting surface is perpendicular to the third direction, the width of the abutting surface in the second direction is M3, and the third direction is perpendicular to the first direction.

[0017] The present invention also provides a battery cell, including a battery cell and the top cover assembly, wherein the battery cell has tabs and the top cover assembly has terminals electrically connected.

[0018] The present invention also provides a method for assembling a battery cell and a top cover assembly, comprising the following steps:

[0019] (1) Obtain the battery cell and the top cover assembly, separate the first latch and the second latch, and leave an operating space between the flip plate and the substrate. The operating space is configured to electrically connect the tabs of the battery cell and the poles of the top cover assembly.

[0020] (2) The tabs of the battery cell are electrically connected to the posts of the top cover assembly;

[0021] (3) Flip the flip plate toward the substrate until the elastic element contacts both the flip plate and the substrate;

[0022] (4) Apply force to the flip plate until the second fastener and the first fastener's first engagement part are pre-engaged;

[0023] (5) When the force applied to the flip plate is removed, the elastic deformation of the elastic element becomes smaller, and the first or second fastener on the flip plate moves toward the first end of the flip plate. At this time, the second fastener automatically switches from pre-engaging with the first fastener part to firmly engaging with the second fastener part of the first fastener.

[0024] Alternatively, if force is continued to be applied to the flip plate, the elastic deformation of the elastic element increases, and the first or second fastener provided on the flip plate moves away from the first end of the flip plate. At this time, the second fastener switches from pre-engaging with the first fastener's first engagement portion to securely engaging with the first fastener's second engagement portion.

[0025] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The assembly method of the top cover assembly, battery cell, and battery cell and top cover assembly of the present invention, on the one hand, has two states: pre-engagement and secure engagement between the first and second fasteners. When the flip plate is flipped to a certain position closer to the substrate, the first engagement portion of the first fastener and the second fastener achieve pre-engagement, allowing for rapid pre-assembly of the first and second fasteners. Then, an elastic element drives the flip plate to deform, performing pulling or pushing operations to ensure the second engagement portion of the first fastener... The relative movement of the first and second fasteners ensures a secure engagement between them. Under the elastic force of the elastic element, the first and second fasteners remain firmly engaged, preventing them from easily springing apart. This prevents low engagement success rates from impacting production pace and yield. Furthermore, during manufacturing, the first fastener can also securely engage with the second engagement portion of the second fastener. Therefore, there is no need to worry about manufacturing errors causing insecure connections between the first and second engagement portions. Attached Figure Description

[0026] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] Figure 1 This is a perspective view of the insulating component in this invention;

[0028] Figure 2 This is a bottom view of the insulating component in this invention;

[0029] Figure 3 for Figure 2 Schematic diagram of section AA;

[0030] Figure 4 This is a perspective view of the flip plate in this invention;

[0031] Figure 5for Figure 4 A magnified view of a section at point B in the middle;

[0032] Figure 6 This is a top view of the flip plate in this invention;

[0033] Figure 7 for Figure 6 A schematic diagram of the C-section;

[0034] Figure 8 for Figure 6 Schematic diagram of the DD section;

[0035] Figure 9 for Figure 6 Schematic diagram of the EE section;

[0036] Figure 10 This is a front sectional view of the top cover assembly when the first and second fasteners are pre-engaged in the present invention.

[0037] Figure 11 for Figure 10 A magnified view of a section at point F in the middle;

[0038] Figure 12 for Figure 10 A magnified view of a section at point G in the middle;

[0039] Figure 13 This is a front sectional view of the top cover assembly when the first and second fasteners are securely engaged in the present invention.

[0040] Figure 14 for Figure 13 A magnified view of a section at point H in the middle;

[0041] Figure 15 for Figure 13 A magnified view of a section at point I.

[0042] Explanation of reference numerals in the accompanying drawings: 1. Top cover; 2. Pole post; 3. Base plate; 4. Flip plate; 5. First latching member; 51. First latching part; 511. First side; 512. Second side; 52. Second latching part; 6. Second latching member; 61. Slot; 62. Bay opening; 7. Elastic element; 71. Recessed hole; 8. Adapter. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0044] Example 1

[0045] See Figures 1 to 15As shown, this is one embodiment of the top cover assembly provided by the present invention.

[0046] The aforementioned top cover assembly includes:

[0047] Top cover 1, equipped with pole post 2;

[0048] An insulating component includes a substrate 3 and a flip plate 4, wherein the substrate 3 is stacked with the top cover 1; the flip plate 4 is disposed on the side of the substrate 3 away from the top cover 1, the flip plate 4 has a first end, and the first end of the flip plate 4 is rotatably connected to the substrate 3.

[0049] A latching assembly is provided between the substrate 3 and the flip plate 4. The latching assembly includes a first latching member 5 and a second latching member 6. One of the substrate 3 and the flip plate 4 is provided with the first latching member 5, and the other is provided with the second latching member 6. The first latching member 5 has a first engaging portion 51 that is pre-engaged with the second latching member 6 and a second engaging portion 52 that is securely engaged with the second latching member 6.

[0050] An elastic element 7 is also provided between the substrate 3 and the flip plate 4. The elastic element 7 is compressible and located between the first end of the substrate 3 and the latching assembly. Under different compression amounts of the elastic element 7, the second latching member 6 can switch from pre-clamping with the first latching part 51 of the first latching member 5 to securely clamping with the second latching part 52 of the first latching member 5.

[0051] The substrate 3 is disposed on one side of the top cover 1 in the thickness direction, and the substrate 3 is consistent with the top cover 1 in the length, width, and thickness directions. When the first latching member 5 and the second latching member 6 are pre-engaged and securely engaged, the thickness direction of the flip plate 4 is approximately consistent with the thickness direction of the substrate 3. The flip plate 4 can be bent and deformed to both sides in its thickness direction; the elastic member 7 applies an elastic force to the substrate 3 and the flip plate 4 when compressed by the substrate 3 and the flip plate 4. Different compression amounts of the elastic member 7 correspond to different curvatures of the flip plate 4. That is, the elastic deformation of the elastic member 7 and the change in curvature of the flip plate 4 cause the relative position of the first latching member 5 and the second latching member 6 to change, and the first latching member 5 moves relative to the second latching member 6 along the length direction of the top cover, thereby changing the connection between the first latching member 5 and the second latching member 6 from the first latching part 51 to the second latching part 52.

[0052] The first latching member 5 and the second latching member 6 have two states: pre-clamping and secure clamping. When the flip plate 4 is flipped to a certain position closer to the substrate 3, the first latching part 51 of the first latching member 5 and the second latching member 6 are pre-clamped (at this time, when the flip plate 4 is flipped away from the substrate 3, the first latching member 5 and the second latching member 6 are easier to disengage, and pre-clamping is also easier). The first latching member 5 and the second latching member 6 can be quickly pre-assembled. Then, the second latching part 52 of the first latching member 5 and the second latching member 6 are... The latching member 6 is securely engaged (at this time, when the flip plate 4 is flipped away from the substrate 3, it is difficult for the first latching member 5 and the second latching member 6 to disengage), and under the action of the elastic force of the elastic member 7, it remains in a securely engaged state (the elastic force of the elastic member 7 makes the second engaging part 52 of the first latching member 5 tightly abut against the second latching member 6, and the two are not easy to move relative to each other), the first latching member 5 and the second latching member 6 are not easy to pop apart, so that the low engagement success rate of the first latching member 5 and the second latching member 6 will not affect the production rhythm and yield rate.

[0053] In this embodiment, there are two second latching portions 52, and the first latching portion 51 is located between the two second latching portions 52. The first latching portion 51 connects the two second latching portions 52.

[0054] One second latching part 52 is located on the side of the first latching part 51 near the first end, and the other second latching part 52 is located on the side of the first latching part 51 away from the first end. When the first latching member 5 and the second latching member 6 are securely latched together, the second latching part 52 located on the side of the first latching part 51 away from the first end is latched and connected to the second latching member 6.

[0055] The aforementioned second locking part 52 is configured as two, so that the first locking member 5 and the second locking member 6 can move in both directions during the process of switching from the pre-locking state to the stable locking state, and the connection method of the first locking member 5 and the second locking member 6 is more diversified.

[0056] Specifically, in this embodiment, when the first latching member 5 and the second latching member 6 are securely engaged, the second latching member 52, which is located on the side of the first latching member 51 near the first end, is engaged with the second latching member 6. Specifically, when the second latching member 6 is pre-engaged with the first latching member 51 of the first latching member 5, the elastic deformation of the elastic member 7 is L1, and the distance between the first latching member 5 or the second latching member 6 on the flip plate 4 and the first end of the flip plate 4 in the first direction is X1; when the second latching member 6 is securely engaged with the second latching member 52 of the first latching member 5, the elastic deformation of the elastic member 7 is L2, and the distance between the first latching member 5 or the second latching member 6 on the flip plate and the first end of the flip plate 4 in the first direction is X2, where L2 < L1 and X2 < X1.

[0057] The elastic deformation of the elastic element 7 refers to the difference between the original size and the deformed size of the elastic element 7 along the thickness direction of the top cover 1. In other words, when the second latching member 6 is pre-engaged with the first latching part 51 of the first latching member 5, the elastic element 7 is compressed to a higher degree. When the second latching member 6 is securely engaged with the second latching part 52 of the first latching member 5, the elastic element 7 is compressed to a lower degree. Assuming the first latching member 5 is mounted on the flip plate 4, when the second latching member 6 is pre-engaged with the first latching part 51 of the first latching member 5, the dimension of the elastic element 7 along the thickness direction of the top cover is the first length, and the distance between the first latching member 5 and the first end of the flip plate 4 is the first distance. When the second latching member 6 is securely engaged with the second latching part 52 of the first latching member 5, the dimension of the elastic element 7 along the thickness direction of the top cover is the second length, and the distance between the first latching member 5 and the first end of the flip plate 4 is the second distance. Therefore, the first length is less than the second length, and the first distance is greater than the second distance. The first direction refers to the length direction of the top cover 1.

[0058] When the first fastener 5 and the second fastener 6 are pre-engaged, the elastic deformation of the elastic element 7 is relatively large. When the first fastener 5 and the second fastener 6 are securely engaged, the elastic deformation of the elastic element 7 is relatively small. In other words, during the process of changing from the pre-engaged state to the secure engaged state, the elastic deformation of the elastic element 7 gradually decreases. The elastic element 7 restores its shape and generates an elastic restoring force, driving the first fastener 5 to change from pre-engaging with the second fastener 6 to securely engaging with the second fastener 6. This saves the manpower required when the first fastener 5 and the second fastener 6 switch from pre-engaging to secure engagement.

[0059] In this embodiment, the second fastener 6 is provided with a slot 61, and both ends of the slot 61 in the first direction penetrate the second fastener 6. A latch 62 is provided at one end of the second fastener 6 that connects to the first fastener 5, and the latch 62 communicates with the slot 61. When the second fastener 6 is pre-engaged with the first engaging portion 51 of the first fastener 5, at least a portion of the first engaging portion 51 extends into the slot 61 through the latch 62 and is slidably engaged with the slot 61. When the second fastener 6 is securely engaged with the second engaging portion 52 of the first fastener 5, at least a portion of the second engaging portion 52 cannot extend out of the slot 61 through the latch 62 and is slidably engaged with the slot 61.

[0060] The second latching member 6 is configured to allow the first latching portion 51 to enter the slot 61 from the latching opening 62 along the thickness direction of the substrate 3, guide the first latching member 5 to move along the length direction of the substrate 3, and restrict the second latching portion 52 from entering and exiting the slot 61 from the latching opening 62 along the thickness direction of the substrate 3. Specifically, the second latching member 6 includes two symmetrically arranged ears arranged sequentially along the width direction of the substrate 3. The end of each ear away from the substrate 3 is bent towards the direction of the other ear to form a hook. The slot 61 is between the two ears, and the latching opening 62 is between the two hooks. The second latching member 6 is a commonly used slot in the prior art, and will not be described in detail here. When the second latching portion 52 is securely latched with the second latching member 6, the second latching portion 52 abuts against the two hooks of the second latching member 6.

[0061] In this embodiment, the length of the slot 61 in the first direction is W1, the length of the first engaging part 51 in the first direction is W2, and during the transition of the second fastener 6 from pre-engaging with the first engaging part 51 of the first fastener 5 to securely engaging with the second engaging part 52 of the first fastener 5, the elastic deformation of the elastic member 7 is ΔL, where ΔL > W2 - W1 + 0.5 mm, and the first direction is the length direction of the top cover 1.

[0062] Since the elastic deformation of the elastic member 7 affects the bending curvature of the flip plate 4, it will affect the movement displacement of the first fastener 5 relative to the second fastener 6, and the aforementioned movement displacement will further affect the engagement size between the second fastening part 52 and the second fastener.

[0063] The elastic deformation of the elastic element 7, the size of the slot 61, and the size of the first snap-fit ​​part 51 are set within a suitable range, so that the snap-fit ​​length between the second snap-fit ​​part 52 of the first snap-fit ​​member 5 and the second snap-fit ​​member 6 is greater than 0.5mm, ensuring that the second snap-fit ​​part 52 of the first snap-fit ​​member 5 and the second snap-fit ​​member 6 are snapped together securely and reliably.

[0064] In this embodiment, in the second direction, the width of the above-mentioned latch 62 is M1, the width of the above-mentioned slot 61 is M2, the width of the above-mentioned first latching part 51 is M4, and the width of the above-mentioned second latching part 52 is M3, wherein -0.1mm < M4-M1 < 0.1mm, M3-M1 > 0.4mm, and M3 ≤ M2, and the above-mentioned second direction is the width direction of the above-mentioned top cover 1.

[0065] The width of the first engaging portion 51 can be slightly greater than, equal to, or less than the width of the latch 62. When the width of the first engaging portion 51 is slightly greater than or equal to the width of the latch 62, the second fastener 6 undergoes elastic deformation when the first engaging portion 51 enters the slot 61 through the latch 62, allowing the pre-engaged first fastener 5 and the second fastener 6 to also achieve a certain degree of mutual engagement and mutual restraint. When the width of the first engaging portion 51 is less than the width of the latch 62, the first engaging portion 51 can smoothly enter the slot 61 through the latch 62. The width of the second engaging portion 52 is at least 0.4 mm greater than the width of the latch 62, ensuring that the second engaging portion 52 will not come off the latch 62.

[0066] By setting the dimensions of the card slot 61, the card opening 62, and the first card fastener 5 within a suitable range, the first card engaging part 51 of the first card fastener 5 can be quickly pre-engaged in the card slot 61, and the second card engaging part 52 of the first card fastener 5 can be reliably engaged in the card slot 61.

[0067] It should be noted that the values ​​of M4-M1 can be -0.08mm, -0.05mm, -0.03mm, 0.02mm, 0.06mm, or 0.08mm.

[0068] In this embodiment, the first snap-fit ​​portion 51 and the second snap-fit ​​portion 52 are connected sequentially along a first direction; the first snap-fit ​​portion 51 has a first side surface 511 and a second side surface 512 that are arranged opposite to each other and parallel to each other, and the distance between the first side surface 511 and the second side surface 512 is M4; the second snap-fit ​​portion 52 has an abutting surface that can abut against the second buckle 6, the abutting surface and the third direction are perpendicular to each other, the width of the abutting surface in the second direction is M3, and the third direction is the thickness direction of the top cover 1.

[0069] The aforementioned slot 61 has two slot walls located on both sides of the latch 62 and a slot bottom facing the latch 62. When the aforementioned first engaging portion 51 is located in the aforementioned slot 61, the first side surface 511 and the second side surface 512 are respectively opposite to the two slot walls of the slot 61, and there is a gap between the first side surface 511 and the second side surface 512 and the two slot walls of the slot 61. When the aforementioned second engaging portion 52 is located in the aforementioned slot 61, the aforementioned abutting surface is opposite to the slot bottom of the slot 61, and there is a gap between the abutting surface and the slot bottom of the slot 61.

[0070] By setting the dimensions of the first snap-fit ​​part 51 and the second snap-fit ​​part 52 within a suitable range, the first snap-fit ​​part 51 of the first snap-fit ​​member 5 can be quickly pre-fitted into the slot 61, and the second snap-fit ​​part 52 of the first snap-fit ​​member 5 can be reliably snapped into the slot 61.

[0071] The present invention also provides a battery cell, including a battery cell and the aforementioned top cover assembly, wherein the battery cell has a tab and the top cover assembly has a terminal post 2 electrically connected.

[0072] The aforementioned battery cell also includes a battery cell, a top cover, and a casing. The battery cell is housed within the casing. The top cover 1 is located at the opening of the casing. The terminal post 2 enables external conductivity. An insulating component is located on the inner side of the top cover 1 in the thickness direction and between the top cover 1 and the battery cell, providing electrical isolation between the top cover 1 and the battery cell. The insulating component provides good insulation. Both the top cover 1 and the base plate 3 have openings for the terminal post 2 to pass through. The terminal post 2 passes through the openings on the top cover 1 and the base plate 3 and is electrically connected to the bent tab on the edge of the battery cell via an adapter 8. Before the terminal post 2 is connected to the tab of the battery cell, the flip plate 4 and the base plate 3 are not connected and are at an angle to each other. The first latching member 5 and the second latching member 6 are not engaged. After the pole post 2 is connected to the electrode tab of the battery cell, the flip plate 4 is located between the base plate 3 and the battery cell. The elastic member 7 rests between the flip plate 4 and the adapter 8. The flip plate 4 is close to the base plate 3, and the included angle between the two is small or they are parallel to each other. The first latching member 5 and the second latching member 6 are pre-engaged and then securely engaged. The flip plate 4 fixes and supports the electrode tab of the battery cell to prevent the weld from being pulled and broken by force, and also to prevent welding slag from falling into the battery cell, thus ensuring the safety of the battery cell.

[0073] The present invention also provides a method for assembling a battery cell and a top cover assembly, comprising the following steps:

[0074] (1) Obtain the battery cell and the top cover assembly described above, so that the first latch 5 and the second latch 6 are in a separated state, and leave an operating space between the flip plate 4 and the substrate 3. The operating space is configured to electrically connect the tabs of the battery cell and the posts 2 of the top cover assembly.

[0075] (2) Connect the tabs of the battery cell to the terminals 2 of the top cover assembly.

[0076] (3) Flip the flip plate 4 toward the substrate 3 until the elastic member 7 comes into contact with both the flip plate 4 and the substrate 3.

[0077] (4) Apply force to the flip plate 4 until the first snap-fit ​​part 51 of the second snap-fit ​​6 and the first snap-fit ​​5 is pre-snap-fitted. At this time, the elastic deformation of the elastic member is L1, and the distance between the first snap-fit ​​5 or the second snap-fit ​​6 on the flip plate and the first end of the flip plate 4 in the first direction is X1.

[0078] (5) When the force applied to the flip plate 4 is removed, the elastic deformation of the elastic member 7 decreases, and the first latch 5 or the second latch 6 provided on the flip plate moves toward the first end of the flip plate. At this time, the second latch 6 automatically switches from pre-clamping with the first latching part 51 of the first latch 5 to firmly clamping with the second latching part 52 of the first latch 5. The elastic deformation of the elastic member 7 is L2, and the distance between the first latch 5 or the second latch 6 provided on the flip plate and the first end of the flip plate 4 in the first direction is X2.

[0079] There are several ways to apply force in step (4) above. One way is to use the first clamp to hold the substrate 3 and the flip plate 4 on both sides and near the location of the elastic member 7, and use the second clamp to hold the substrate 3 and the flip plate 4 on both sides and near the location of the second latching member 6. In step (5) above, the first clamp is removed first, and the second clamp is not removed for the time being. The second clamp is removed only when the second latching part 52 of the first latching member 5 is firmly latched with the second latching member 6.

[0080] In step (4) above, when the first snap-fit ​​part 51 of the second snap-fit ​​6 and the first snap-fit ​​part 5 of the first snap-fit ​​5 are pre-snap-fitted, the flip plate is in a flat state or an arched state. In step (5) above, after the first snap-fit ​​part 51 of the second snap-fit ​​6 and the first snap-fit ​​part 5 of the first snap-fit ​​5 are securely snapped together, the flip plate is in an arched state and the degree of arching is greater than that in step (4).

[0081] It is worth noting that, since the top cover assembly generally includes a positive terminal and a negative terminal, the tab of the positive electrode of the battery cell is connected to the positive terminal, and the tab of the negative electrode of the battery cell is connected to the negative terminal, two flip plates 4 are required. The two flip plates 4 are rotatably connected to both ends of the substrate 3 along its length. One flip plate 4 is used to support and fix the tab of the positive electrode of the battery cell, and the other flip plate 4 is used to support and fix the tab of the negative electrode of the battery cell. The aforementioned elastic element 7 has a recessed hole 71. The recessed hole 71 is directly opposite the solder mark between the terminal 2 and the adapter 7.

[0082] Example 2

[0083] The rest is the same as in Embodiment 1, except that when the first fastener and the second fastener are securely engaged, the second fastener located on the side of the first fastener away from the first end is engaged with the second fastener. Specifically, when the second fastener is pre-engaged with the first fastener of the first fastener, the elastic deformation of the elastic element is L3, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X3; when the second fastener is securely engaged with the second fastener of the first fastener, the elastic deformation of the elastic element is L4, and the distance between the first or second fastener on the flip plate and the first end of the flip plate in the first direction is X3, where L4 > L3 and X4 > X3.

[0084] The elastic deformation of the aforementioned elastic element refers to the difference between the original dimension and the deformed dimension of the elastic element along the thickness direction of the top cover. In other words, when the second latching element is pre-engaged with the first latching part of the first latching element, the elastic element is compressed to a lower degree. When the second latching element is securely engaged with the second latching part of the first latching element, the elastic element is compressed to a higher degree. Assuming the first latching element is located on the flip plate, when the second latching element is pre-engaged with the first latching part of the first latching element, the dimension of the elastic element along the thickness direction of the top cover is a first length, and the distance between the first latching element and the first end of the flip plate is a first distance. When the second latching element is securely engaged with the second latching part of the first latching element, the dimension of the elastic element along the thickness direction of the top cover is a second length, and the distance between the first latching element and the first end of the flip plate is a second distance. Therefore, the first length is greater than the second length, and the first distance is less than the second distance. When the first latching element and the second latching element are securely engaged, the second latching part located on the side of the first latching part closer to the first end engages with the second latching element.

[0085] When the first and second fasteners are pre-engaged, the elastic deformation of the elastic element is small. When the first and second fasteners are securely engaged, the elastic deformation of the elastic element is large. The elastic force that needs to be overcome when the first and second fasteners are pre-engaged is small, which saves manpower required for the pre-engagement of the first and second fasteners. If the first and second fasteners spring apart after being securely engaged, the elastic force that needs to be overcome is large, which can ensure that the first and second fasteners are not easy to spring apart after being securely engaged.

[0086] The following describes the assembly method of the battery cell and top cover assembly in this embodiment, including the following steps:

[0087] (1) Obtain the battery cell and the top cover assembly described above, separate the first latch and the second latch, and leave an operating space between the flip plate and the substrate. The operating space is configured to electrically connect the tabs of the battery cell and the poles of the top cover assembly.

[0088] (2) Connect the tabs of the battery cell to the terminals of the top cover assembly.

[0089] (3) Flip the flip plate toward the substrate until the elastic member contacts both the flip plate and the substrate.

[0090] (4) Apply force to the flip plate until the first snap-fit ​​part of the second snap-fit ​​and the first snap-fit ​​part of the first snap-fit ​​are pre-snap. At this time, the elastic deformation of the elastic member is L3, and the distance between the first snap-fit ​​or the second snap-fit ​​on the flip plate and the first end of the flip plate in the first direction is X3.

[0091] (5) Continue to apply force to the above-mentioned flip plate, the elastic deformation of the above-mentioned elastic element increases, and the first or second fastener provided on the above-mentioned flip plate moves away from the first end of the above-mentioned flip plate. At this time, the second fastener switches from pre-engaging with the first engagement part of the above-mentioned first fastener to being firmly engaged with the second engagement part of the above-mentioned first fastener. The elastic deformation of the above-mentioned elastic element is L4, and the distance between the first or second fastener provided on the above-mentioned flip plate and the first end of the above-mentioned flip plate in the first direction is X4.

[0092] There are several ways to apply force in step (4) above. One way is to use the first clamp to hold the substrate and the flip plate on both sides and near the location of the elastic member, and use the second clamp to hold the substrate and the flip plate on both sides and near the location of the second latching member. In step (5) above, neither the first clamp nor the second clamp is removed until the second latching part of the first latching member is securely engaged, at which point the first clamp and the second clamp are removed.

[0093] In step (4) above, when the second fastener and the first fastening part of the first fastener are pre-engaged, the flip plate is in an arched state. In step (5) above, after the second fastener and the first fastening part of the first fastener are securely engaged, the flip plate is in an arched state and the degree of arching is smaller than that in step (4), or the flip plate is in a flat state.

[0094] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A top cover assembly, characterized in that, include: Top cover (1) is provided with pole post (2); An insulating component includes a substrate (3) and a flip plate (4), wherein the substrate (3) is stacked with the top cover (1); the flip plate (4) is disposed on the side of the substrate (3) away from the top cover (1), the flip plate (4) has a first end, and the first end of the flip plate (4) and the first end of the substrate (3) are flipped to be connected. A latching assembly is provided between the base plate (3) and the flip plate (4) at a position away from their respective first ends. The latching assembly includes a first latching member (5) and a second latching member (6). One of the base plate (3) and the flip plate (4) is provided with the first latching member (5), and the other is provided with the second latching member (6). The first latching member (5) has a first latching part (51) that is pre-engaged with the second latching member (6) and a second latching part (52) that is securely engaged with the second latching member (6). An elastic element (7) is also provided between the substrate (3) and the flip plate (4). The elastic element (7) is compressible and located between the first end of the substrate (3) and the buckle assembly. Under different compression amounts of the elastic element (7), the second buckle (6) can switch from pre-engaging with the first buckle (5) at the first buckle (5) to securely engaging with the second buckle (5) at the second buckle (5). The first snap-fit ​​portion (51) and the second snap-fit ​​portion (52) are connected sequentially along a first direction; the first snap-fit ​​portion (51) has a first side surface (511) and a second side surface (512) that are arranged opposite to each other and parallel to each other, and the distance between the first side surface (511) and the second side surface (512) is M4; the second snap-fit ​​portion (52) has an abutting surface that can abut against the second buckle (6), the abutting surface and the third direction are perpendicular to each other, the width of the abutting surface in the second direction is M3, and the third direction and the first direction are perpendicular to each other.

2. The top cover assembly according to claim 1, characterized in that, When the second fastener (6) is pre-engaged with the first engagement part (51) of the first fastener (5), the elastic deformation of the elastic member (7) is L1, and the distance between the first fastener (5) or the second fastener (6) on the flip plate and the first end of the flip plate (4) in the first direction is X1; when the second fastener (6) is securely engaged with the second engagement part (52) of the first fastener (5), the elastic deformation of the elastic member (7) is L2, and the distance between the first fastener (5) or the second fastener (6) on the flip plate and the first end of the flip plate (4) in the first direction is X2, L2 < L1, and X2 < X1.

3. The top cover assembly according to claim 1, characterized in that, When the second fastener (6) is pre-engaged with the first engagement part (51) of the first fastener (5), the elastic deformation of the elastic member (7) is L3, and the distance between the first fastener (5) or the second fastener (6) on the flip plate and the first end of the flip plate (4) in the first direction is X3; when the second fastener (6) is securely engaged with the second engagement part (52) of the first fastener (5), the elastic deformation of the elastic member (7) is L4, and the distance between the first fastener (5) or the second fastener (6) on the flip plate and the first end of the flip plate (4) in the first direction is X4, L4 > L3, and X4 > X3.

4. The top cover assembly according to claim 1, 2, or 3, characterized in that, There are two second latching parts (52), and the first latching part (51) is located between the two second latching parts (52), and the first latching part (51) connects the two second latching parts (52).

5. The top cover assembly according to claim 4, characterized in that, The second fastener (6) is provided with a slot (61), and both ends of the slot (61) along the first direction pass through the second fastener (6); the end of the second fastener (6) connected to the first fastener (5) is provided with a slot (62), and the slot (62) communicates with the slot (61); when the second fastener (6) is pre-engaged with the first engagement part (51) of the first fastener (5), at least a portion of the first engagement part (51) extends into the slot (61) through the slot (62) and is slidably engaged with the slot (61); when the second fastener (6) is securely engaged with the second engagement part (52) of the first fastener (5), at least a portion of the second engagement part (52) cannot extend out of the slot (61) through the slot (62) and is slidably engaged with the slot (61).

6. The top cover assembly according to claim 5, characterized in that, The length of the slot (61) in the first direction is W1, and the length of the first engaging part (51) in the first direction is W2. During the transition from pre-engaging with the first engaging part (51) of the second fastener (6) to securely engaging with the second engaging part (52) of the first fastener (5), the elastic deformation of the elastic member (7) is... ,in, >W2-W1+0.5mm.

7. The top cover assembly according to claim 5, characterized in that, In the second direction, the width of the latch (62) is M1, the width of the slot (61) is M2, the width of the first latching part (51) is M4, and the width of the second latching part (52) is M3, wherein -0.1mm < M4 - M1 < 0.1mm, M3 - M1 > 0.4mm, M3 ≤ M2, and the second direction is perpendicular to the first direction.

8. A single battery cell, characterized in that, It includes a battery cell and a top cover assembly as described in any one of claims 1-7, wherein the battery cell has tabs and the top cover assembly has posts (2) electrically connected.

9. A method for assembling a battery cell and a top cover assembly, characterized in that, Includes the following steps: (1) Obtain the battery cell and the top cover assembly according to any one of claims 1 to 7, so that the first latch (5) and the second latch (6) are in a separated state, and leave an operating space between the flip plate (4) and the substrate (3), the operating space being configured to electrically connect the tabs of the battery cell and the poles (2) of the top cover assembly. (2) The tabs of the battery cell and the posts (5) of the top cover assembly are electrically connected; (3) Flip the flip plate (4) toward the substrate (3) until the elastic member (7) contacts both the flip plate (4) and the substrate (3); (4) Apply force to the flip plate (4) until the first engaging part (51) of the second fastener (6) and the first fastener (5) are pre-engaged; (5) When the force applied to the flip plate (4) is removed, the elastic deformation of the elastic member (7) decreases, and the first buckle (5) or the second buckle (6) provided on the flip plate moves toward the first end of the flip plate. At this time, the second buckle (6) automatically switches from being pre-engaged with the first buckle (51) of the first buckle (5) to being securely engaged with the second buckle (5) of the first buckle (5). Alternatively, if force is applied to the flip plate (4), the elastic deformation of the elastic member (7) increases, and the first snap fastener (5) or the second snap fastener (6) on the flip plate moves away from the first end of the flip plate. At this time, the second snap fastener (6) switches from pre-attaching with the first snap fastener (51) to firmly snapping with the second snap fastener (52) of the first snap fastener (5).

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