Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and a battery, and the top cover assembly comprises a cover plate provided with a through hole; the pole is arranged on the outer side of the cover plate and is in insulated connection with the cover plate; the adapter plate is arranged on the inner side of the cover plate and is in insulated connection with the cover plate; and the contact piece comprises a fixed end and a movable end, the fixed end is connected with the pole, and the movable end extends to the through hole and is in separable contact with the adapter plate. The contact element has thermal deformation, so that when the temperature is higher than a preset first temperature value, the movable end is separated from the adapter plate, and when the temperature is lower than a preset second temperature value, the movable end is in contact with the adapter plate. By utilizing the characteristic that the contact element deforms due to heat, the pole and the adapter plate are disconnected or connected through deformation and deformation recovery of the contact element, protection is triggered in time before thermal runaway of the battery cell occurs, the access can be recovered after the temperature is reduced, and the battery cell is prevented from being damaged permanently.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection devices, and more specifically, to a top cover assembly. In addition, the utility model also relates to a battery including the top cover assembly. Background Art

[0002] In order to avoid thermal runaway of the battery and the risk of explosion, a cell overtemperature protection device is usually used to protect the battery.

[0003] In related technologies, the battery cell overtemperature protection device is a destructive protection. For example, a flip plate is set inside the battery cover. When the battery cell experiences thermal runaway and produces a large amount of gas, the increase in the internal pressure of the battery cell is used to force the flip plate to flip, thereby permanently causing the battery cell to short-circuit and prevent thermal runaway.

[0004] However, a problem with this structure is that the protection can only be triggered in the early stage of thermal runaway of the battery cell, and it is a destructive protection, after which the battery cell will fail and become unusable. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a top cover assembly to solve the technical problem that the protection of the battery cell can only be triggered in the early stage of thermal runaway. The top cover assembly is triggered in time before the battery cell undergoes thermal runaway, and the path can be restored after the temperature drops to avoid permanent damage to the battery cell.

[0006] Another object of the present invention is to provide a battery including the above-mentioned top cover assembly, which can trigger protection in time before thermal runaway occurs in the battery cell and restore the path after the temperature drops to avoid permanent damage to the battery cell.

[0007] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0008] A top cover assembly, comprising:

[0009] a cover plate having a through hole;

[0010] A pole, provided on the outer side of the cover plate and insulated from the cover plate;

[0011] an adapter plate, disposed on the inner side of the cover plate and insulated from the cover plate;

[0012] The contact piece includes a fixed end and a movable end, wherein the fixed end is connected to the pole, and the movable end extends to the through hole and is in detachable contact with the adapter plate.

[0013] Optionally, a side of the movable end close to the adapter plate is connected to a conductive member, and an area of ​​a side of the conductive member close to the movable end is smaller than an area of ​​a side of the conductive member close to the adapter plate.

[0014] Optionally, the movable end is provided with an opening.

[0015] Optionally, at least part of the side walls on both sides of the opening are fixedly connected to form a connecting portion.

[0016] Optionally, the conductive member covers the connecting portion.

[0017] Optionally, the contact member is provided with a hollow hole, and the hollow hole is communicated with the opening.

[0018] Optionally, the width of the contact piece gradually increases from the end of the movable end to the fixed end; and / or,

[0019] The width of the opening gradually increases along a direction from the end of the movable end to the fixed end.

[0020] Optionally, the cover plate is an insulating member; and / or,

[0021] A first insulating seal is provided between the cover plate and the adapter plate; and a fourth insulating seal is provided between the cover plate and the pole.

[0022] Optionally, the pole is provided with a groove, the groove includes a first bottom surface and a second bottom surface forming a step, the depth of the first bottom surface is greater than the depth of the second bottom surface, and the contact member is connected to the second bottom surface; and / or,

[0023] The adapter plate is provided with a protrusion, the protrusion is arranged in the through hole, and the contact piece is in detachable contact with the end surface of the protrusion.

[0024] Optionally, along the thickness direction of the top cover assembly, the height of the protrusion is lower than the height of the upper surface of the through hole.

[0025] Optionally, the contact piece is a bimetallic strip, a trimetallic strip or a memory metal strip.

[0026] A battery comprises any one of the above-mentioned top cover assemblies.

[0027] The top cover assembly provided by the utility model has the following beneficial effects:

[0028] The application is applied to a battery, and in normal case, the movable end of the contact piece is in contact with the adapter plate during operation to make the pole post and the adapter plate conductive by the contact piece. When the battery cell generates heat and the temperature is higher than a preset first temperature value, the contact piece is deformed due to the deformation characteristic of the contact piece, so that the position of the movable end of the contact piece is changed, the movable end of the contact piece is separated from the adapter plate and is not in contact, thereby actively disconnecting the pole post and the adapter plate, forming internal disconnection of the cell, and avoiding continuous heating of the cell. When the temperature of the cell is reduced and is lower than a preset second temperature value, the contact piece is restored due to the temperature change, so that the movable end of the contact piece is in contact with the adapter plate, realizing the conduction of the pole post and the adapter plate, that is, the cell passage can be restored automatically when the temperature is reduced, thereby avoiding permanent damage of the cell.

[0029] That is, the top cover assembly utilizes the deformation characteristic of the contact piece under heat, realizes automatic disconnection or conduction of the pole post and the adapter plate under the influence of temperature by deformation and deformation recovery of the contact piece, and thus can trigger the cell protection in time when the cell generates heat and the temperature is higher than the preset first temperature value, avoid thermal runaway of the cell, and restore the cell passage when the temperature is reduced to be lower than the preset second temperature value, thereby avoiding permanent damage of the cell.

[0030] Moreover, the fixed end of the contact piece is connected with the pole post, the movable end of the contact piece is separably in contact with the adapter plate, the contact piece is single-end fixed, the movable end is a free end, and the single-end constraint arrangement mode can make the movable end of the contact piece have a large deformation amount, so as to ensure effective disconnection or conduction of the movable end and the adapter plate.

[0031] The battery provided by the utility model has the same beneficial effects as the top cover assembly. ACCURATE DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the following will briefly introduce the drawings needed to be used in the embodiment or related technology description, and obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0033] Figure 1 The sectional view of the conductive piece of the top cover assembly provided by the embodiment of the utility model and the adapter plate abutting each other is shown in the figure.

[0034] Figure 2 The sectional view of the conductive piece of the top cover assembly provided by the embodiment of the utility model and the adapter plate abutting each other is shown in the figure. Figure 1 The local enlarged view of A in the figure.

[0035] Figure 3 The sectional view of the conductive piece of the top cover assembly provided by the embodiment of the utility model and the adapter plate abutting each other is shown in the figure.

[0036] Figure 4 For Figure 3 A local enlarged view of the middle B;

[0037] Figure 5 A side view of the bimetallic strip;

[0038] Figure 6 A top view of the bimetallic strip;

[0039] Figure 7 A bottom view of the bimetallic strip after being connected with the conductive piece.

[0040] Reference signs:

[0041] 1-cover plate; 11-through hole; 2-pole; 21-groove; 3-adapter plate; 31-protruding part; 4-contact piece; 41-fixed end; 42-movable end; 43-opening; 44-hollow hole; 5-conductive piece; 6-first insulation sealing piece; 61-second insulation sealing piece; 62-third insulation sealing piece; 7-fourth insulation sealing piece. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0043] The core of the utility model is to provide a top cover assembly, which is triggered in time before the thermal runaway of the battery cell, and the path can be restored after the temperature decreases, so as to avoid permanent damage to the battery cell. Another core of the utility model is to provide a battery comprising the above-mentioned top cover assembly, which can trigger protection in time before the thermal runaway of the battery cell, and the path can be restored after the temperature decreases, so as to avoid permanent damage to the battery cell.

[0044] It should be noted that, Figure 6 And Figure 7 The Z-axis direction in the embodiment is perpendicular to the X-axis and Y-axis directions; alternatively, the X-axis is perpendicular to the Y-axis.

[0045] Please refer to Figures 1-4 The utility model embodiment provides a top cover assembly, which comprises a cover plate 1, a pole 2, an adapter plate 3 and a contact piece 4, the cover plate 1 is provided with a through hole 11;The pole 2 is arranged on the outer side of the cover plate 1 and is insulatedly connected with the cover plate 1;The adapter plate 3 is arranged on the inner side of the cover plate 1 and is insulatedly connected with the cover plate 1;The contact piece 4 comprises a fixed end 41 and a movable end 42, the fixed end 41 is connected with the pole 2, and the movable end 42 extends to the through hole 11 and is separably contacted with the adapter plate 3.

[0046] In this way, the contact member 4 is in a cantilever beam state, which avoids the contact member 4 from being divided into two closed sub-cavities in the space between the cover plate 1 and the pole 2, thereby avoiding the problem of being unable to balance the pressure difference between the two sub-cavities during the process of the contact member 4 and the adapter plate 3 being detachably contacted, and thus enables the contact member 4 to accurately change the contact state with the adapter plate 3 only with the effect of temperature.

[0047] It should be noted that the contact member 4 is thermally deformable so that the movable end 42 is separated from the adapter plate 3 when the temperature is higher than a preset first temperature value, and is brought into contact with the adapter plate 3 when the temperature is lower than a preset second temperature value.

[0048] In other embodiments, a solution in which the fixed end 41 of the contact member 4 is connected to the adapter plate 3 and the movable end 42 of the contact member 4 is in detachable contact with the pole 2 may be employed. This solution has the same function and effect as a solution in which the fixed end 41 is connected to the pole 2 and the movable end 42 extends to the through hole 11 and is in detachable contact with the adapter plate 3. For ease of description, the following description uses the example of a solution in which the fixed end 41 of the contact member 4 is connected to the pole 2 and the movable end 42 of the contact member 4 is in detachable contact with the adapter plate 3.

[0049] The top cover assembly is applied to the battery, and when working, under normal circumstances, such as Figure 2 As shown, the movable end 42 of the contact member 4 contacts the adapter plate 3, so that the pole 2 and the adapter plate 3 are connected by the contact member 4. Figure 4 As shown, when the battery cell heats up and the temperature exceeds the preset first temperature value, the contact member 4 deforms due to its characteristic of deformation due to heat, causing the contact member 4 to change position, causing the movable end 42 of the contact member 4 to move away from the adapter plate 3 along the X-axis direction, thereby separating the movable end 42 from the adapter plate 3 without contact, thereby actively disconnecting the pole 2 from the adapter plate 3, forming an internal short circuit in the battery cell and preventing the battery cell from continuing to heat up. When the temperature of the battery cell drops below the preset second temperature value, the temperature change causes the contact member 4 to resume deformation, causing the movable end 42 of the contact member 4 to move closer to the adapter plate 3 along the X-axis direction and contact the adapter plate 3, achieving conduction between the pole 2 and the adapter plate 3. In other words, the battery cell circuit can be automatically restored after the temperature drops, thereby preventing permanent damage to the battery cell.

[0050] That is to say, the embodiment of the present invention utilizes the characteristic of the contact member 4 being deformed by heat, and through the deformation and deformation recovery of the contact member 4, realizes that the pole 2 and the adapter plate 3 are automatically disconnected or connected under the influence of temperature, and then when the battery cell heats up to a temperature higher than the preset first temperature value, the battery cell protection is triggered in time to avoid thermal runaway of the battery cell, and when the temperature drops to below the preset second temperature value, the battery cell path is restored to avoid permanent damage to the battery cell. Moreover, the fixed end 41 of the contact member 4 is connected to the pole 2, and the movable end 42 of the contact member 4 is in detachable contact with the adapter plate 3, so that the contact member 4 is single-end fixed, and its movable end 42 is a free end. This single-end constraint setting method can make the movable end 42 of the contact member 4 have a larger deformation amount to ensure that the movable end 42 is effectively disconnected or connected with the adapter plate 3.

[0051] It should be noted that this embodiment does not limit the specific sizes of the preset first temperature value and the preset second temperature value, which are related to the deformation amount of the contact member 4 caused by the temperature. Those skilled in the art can obtain them through several experiments according to actual needs.

[0052] For example, in some embodiments, the preset first temperature value is 86°C and the preset second temperature value is 61°C. That is, when the temperature is higher than 86°C, the contact member 4 deforms and automatically switches to the open state. When the temperature is lower than 61°C, the contact member 4 recovers its deformation and automatically switches to the closed state. The open state refers to a separation state in which the movable end 42 of the contact member 4 is not in contact with the adapter plate 3, and the closed state refers to a state in which the movable end 42 of the contact member 4 is in contact with the adapter plate 3.

[0053] It should be noted that this embodiment does not limit the specific structure and material of the contact member 4 , as long as the contact member 4 is conductive and can be deformed by heat.

[0054] In some embodiments, the contact member 4 is a bimetallic strip, a trimetallic strip, or a memory metal strip. It is well known that the bimetallic strip, the trimetallic strip, or the memory metal strip can all meet the above-mentioned characteristics of the contact member 4. Taking the bimetallic strip as an example, it includes two metal layers with different thermal expansion coefficients, which are respectively called the active layer and the passive layer. The thermal expansion coefficient of the active layer is greater than the thermal expansion coefficient of the passive layer. When the temperature rises and changes, the deformation of the active layer is greater than the deformation of the passive layer, so that the bimetallic strip as a whole bends toward the side of the passive layer. The bending deformation will cause the battery cell to open the circuit when supplying power to the outside, forming an open circuit when reaching the preset first temperature value, and the battery cell restores the circuit when the temperature drops.

[0055] It should be noted that this embodiment does not impose any specific restrictions on the metal material of the contact member 4 , as long as the thermal expansion coefficient of the active layer is higher than the thermal expansion coefficient of the passive layer.

[0056] In some embodiments, the metal of the contact 4 is a combination of at least two of copper, aluminum, steel, titanium, and nickel.

[0057] Preferably, the bimetallic strip is composed of an aluminum sheet and a copper sheet, the active layer is an aluminum sheet (the thermal expansion coefficient of the aluminum sheet is 23.1*10^-6 / ℃), and the passive layer metal is a copper sheet (the thermal expansion coefficient of the copper sheet is 16.6*10^-6 / ℃).

[0058] Furthermore, the thickness of the aluminum sheet and the copper sheet is 0.5 mm to 2 mm respectively.

[0059] Furthermore, it should be noted that the embodiments of the present invention do not limit the specific connection method between the fixed end 41 of the contact 4 and the pole 2, as long as the connection can be achieved. For example, in some embodiments, the fixed end 41 of the contact 4 and the pole 2 are connected together by laser welding, or adhesive bonding, etc.

[0060] In addition, to enhance conductivity, please continue to refer to Figure 2 and Figure 4 In some embodiments, the movable end 42 of the contact member 4 is connected to the conductive member 5 on the side close to the adapter plate 3 , and the area of ​​the conductive member 5 close to the movable end 42 is smaller than the area of ​​the conductive member 5 close to the adapter plate 3 .

[0061] That is to say, in this embodiment, the movable end 42 of the contact member 4 is in detachable contact with the adapter plate 3 through the conductive member 5 to increase the contact area, enhance the conductivity, and improve the current carrying capacity.

[0062] like Figure 2 As shown, along the X-axis direction, the area of ​​the conductive part 5 close to the movable end 42 is smaller than the area of ​​the conductive part 5 close to the adapter plate 3, and the contact area between the conductive part 5 and the adapter plate 3 is larger, which can maximize the contact area between the conductive part 5 and the adapter plate 3 and reduce the contact impedance; the area where the conductive part 5 is connected to the movable end 42 of the contact part 4 is smaller, so that the conductive part 5 and the tip of the contact part 4 can be welded and contacted, and the conductivity is better than the contact type. Therefore, the area of ​​the conductive part 5 close to the adapter plate 3 is larger than the area of ​​the conductive part 5 close to the movable end 42 of the contact part 4.

[0063] It should be noted that this embodiment does not limit the specific structure of the conductive member 5 , as long as the conductive member 5 can be connected to the movable end 42 of the contact member 4 and can be detachably contacted with the adapter plate 3 .

[0064] In some embodiments, the conductive member 5 is a T-shaped structure, with the side with a larger end surface area facing the adapter plate 3 and the side with a smaller end surface area connected to the movable end 42 of the contact member 2 .

[0065] Also, please refer to Figure 5In order to enable the conductive member 5 to fully contact the adapter plate 3 , in some embodiments, the contact member 4 has a warped portion so that the conductive member 5 can fully contact the adapter plate 3 .

[0066] That is to say, the contact member 4 has a certain deformation in the initial state, such as Figure 5 As shown, the length of the contact member 4 extends along the Y-axis and has a curved portion that bends toward the X-axis. This curved portion allows the contact surface of the movable end 42 to completely adhere to the adapter plate 3. For example, when the contact member 4 is a bimetallic strip, the bimetallic strip naturally bends with the passive metal sheet toward the active metal sheet. This ensures that the conductive member 5 is in full contact with the adapter plate 3, thereby improving the reliability of the contact between the conductive member 5 and the adapter plate 3.

[0067] Furthermore, in some embodiments, the bimetallic strip is in a natural state and when the temperature is lower than 80° C., the passive layer metal strip is bent toward the active layer metal strip.

[0068] In addition, this embodiment does not limit the specific size of the warped portion, as long as the warped portion can enable the conductive member 5 to fully contact the adapter plate 3 .

[0069] Preferably, the warped portion extends 15 mm from the end of the movable end 42 toward the fixed end 41, and the height of the warped portion is 3 mm. That is, the warped portion extends 15 mm from the end of the movable end 42 along the Y-axis, and the distance between the two ends of the warped portion along the X-axis is 3 mm. This ensures that the conductive member 5 forms good contact with the adapter plate 3 at room temperature.

[0070] It can also be understood that in other embodiments, those skilled in the art can reasonably select the extension length of the warping portion according to actual needs, for example, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm; and reasonably select the height of the warping portion, for example, 0.5mm, 1mm, 2mm, 4mm or 5mm, etc.

[0071] To facilitate the formation of the warp, please refer to Figure 6 In some embodiments, the movable end 42 is provided with an opening 43 .

[0072] It should be noted that before the movable end 42 is connected to the conductive member 5, the width of the opening 43 is equal everywhere. After the movable end 42 is connected to the conductive member 5, the width of the opening 43 gradually increases from the end of the movable end 42 toward the end away from the movable end 42, that is, the width of the opening 43 gradually increases from the end along the Y-axis direction.

[0073] It can be understood that after the opening 43 is set at the movable end 42 of the contact member 4, by bending the side walls on both sides of the opening 43 upward or downward to a preset height, and connecting the end of the opening 43 located at the end of the movable end 42 to the conductive member 5, the width of the opening 43 after the connection gradually increases from the end of the movable end 42 toward the direction away from the end of the movable end 42 (along the Y-axis direction), and a warping portion can be formed at the movable end 42, so that the conductive member 5 is in close contact with the adapter plate 3.

[0074] It should be noted that the mechanism by which the opening 43 forms the warped portion is that the opening 43 introduces a stress preload, causing the contact member 4 to bend at room temperature. By properly designing the shape and position of the opening 43, the contact member 4 can maintain a stable upward curvature at room temperature, i.e., a warped portion. Furthermore, the upward curvature (i.e., the warped portion) of the contact member 4 at room temperature is primarily due to elastic deformation. The uneven internal stress distribution of the two materials of the bimetallic strip causes the bimetallic strip to maintain its upward curvature at room temperature.

[0075] It should be noted that after the warp is formed, a stability analysis is required to ensure that the warp maintains a stable bending height to ensure that the contact member 4 does not deform unstably when subjected to external forces. When designing the bending height of the warp of the contact member 4, two metal materials with appropriate expansion coefficients and elastic moduli can be selected. Through experiments and simulations, the shape and size of the opening 43 can be designed to ensure that the bimetallic strip achieves the desired bending height at room temperature (for example, in some embodiments, the bending height of the warp ranges from 0.5 mm to 5 mm). Actual testing can then be performed to verify that the design achieves the desired bending height. Through reasonable design and verification, the bimetallic strip can maintain a stable upward bending shape at room temperature and meet the requirements of specific applications.

[0076] Furthermore, in some embodiments, at least a portion of the sidewalls on both sides of the opening 43 are fixedly connected to form a connecting portion. In other words, in this embodiment, by fixing at least a portion of the sidewalls on both sides of the opening 43, the opening 43 is partially closed, which is conducive to forming a warped portion. Moreover, after at least a portion of the sidewalls on both sides of the opening 43 are fixedly connected to form a connecting portion, it is convenient to connect the conductive member 5 to the connecting portion.

[0077] For example, in some embodiments, the sidewalls of the opening 43 at the end of the movable end 42 are fixedly connected, so that the end of the opening 43 at the end of the movable end 42 is closed. In other words, the width of the opening 43 at the end of the movable end 42 is zero, and the width of the opening 43 gradually increases from zero toward the end away from the movable end 42. This helps to increase the degree of warping of the warped portion and facilitates close contact between the conductive member 5 and the adapter plate 3.

[0078] Optionally, the embodiment does not limit the way of fixedly connecting the side walls on both sides of the at least partially open portion 43. In some embodiments, the side walls on both sides of the at least partially open portion 43 are welded to form a welded portion.

[0079] Further, the conductive member 5 covers the connecting portion. That is, the conductive member 5 is arranged at the connecting portion formed after the side walls on both sides of the at least partially open portion 43 are fixedly connected, that is, the conductive member 5 is located at the top end of the buckling portion, so as to facilitate the conductive member 5 to fully contact the adapter plate 3.

[0080] In addition, please refer to Figure 6 and Figure 7 In some embodiments, the contact member 4 is provided with a hollow hole 44. It can be understood that the hollow hole 44 can reduce the weight of the contact member 4 on the one hand, thereby reducing the overall weight of the top cover assembly, and on the other hand, the hollow hole 44 can also increase the flexibility of the contact member 4 to adapt to the complex deformation requirement to bend upward or downward.

[0081] Further, in some embodiments, the hollow hole 44 is in communication with the opening 43. That is, one end of the opening 43 away from the end of the movable end 42 is in communication with the hollow hole 44 to form an overall opening 43 structure, that is, the length of the opening 43 is increased by using the hollow hole 44, thereby more facilitating the movable end 42 to form the buckling portion.

[0082] In addition, as shown in Figure 6 and Figure 7 In some embodiments, the width of the contact member 4 gradually increases in the direction from the end of the movable end 42 to the fixed end 41, that is, the size of the contact member 4 along the Z axis gradually increases in the Y axis direction from the end of the movable end 42. That is, the movable end 42 is a tapered structure from the end close to the fixed end 41 to the end of the movable end 42, which can optimize the stress distribution of the contact member 4 bending upward or downward, and avoid stress concentration at the welded portion of the opening 43. Of course, any shape structure that can optimize the stress distribution is also possible.

[0083] Further, in some embodiments, the width trend of the hollow hole 44 is the same as the width trend of the contact member 4 at the position corresponding to the hollow hole 44. That is, in the Y axis direction, the width size of the hollow hole 44 along the Z axis gradually increases from the end close to the opening 43 to the end away from the opening 43. In this way, it is beneficial to make the structure of the contact member 4 more balanced and improve the symmetry of the structure of the contact member 4, thereby further optimizing the stress distribution of the contact member 4 bending upward or downward.

[0084] Furthermore, in some embodiments, the width of opening 43 gradually increases from the end of movable end 42 to fixed end 41. That is, along the Y-axis, the width of opening 43 gradually increases from its end to the end closest to hollow hole 44. As can be seen from the foregoing, this arrangement facilitates the formation of a warped portion at movable end 42, achieving close contact between conductive member 5 and adapter plate 3.

[0085] In addition, to prevent the electrolyte inside the battery from corroding the contact 4, please refer to Figure 2 and Figure 4 In some embodiments, a first insulating seal 6 is provided between the cover plate 1 and the adapter plate 3. In other words, in this embodiment, the first insulating seal 6 seals the joint between the cover plate 1 and the adapter plate 3, preventing electrolyte from leaking from the joint between the cover plate 1 and the adapter plate 3 to the contact 4 and corroding the contact 4. This protects the contact 4 and increases its service life.

[0086] In addition, in some embodiments, a fourth insulating seal 7 is provided between the cover plate 1 and the pole 2 to provide an insulating connection between the cover plate 1 and the pole 2 .

[0087] In other embodiments, the cover plate 1 is an insulating member, so as to facilitate the insulating connection between the cover plate 1 and the pole 2 and the adapter plate 3 .

[0088] In addition, the above embodiment does not limit the specific structure of the pole 2, as long as it can meet the arrangement of the contact member 4 and the conductive member 5.

[0089] Please refer to Figure 2 and Figure 4 In some embodiments, the pole 2 is provided with a recess 21. The recess 21 includes a first bottom surface and a second bottom surface that form a step. The depth of the first bottom surface is greater than the depth of the second bottom surface. The contact member 4 is connected to the second bottom surface. In other words, the contact member 4 can be disposed within the recess 21, which provides installation space for the contact member 4. When the movable end 42 of the contact member 4 is connected to the conductive member 5, the recess 21 also serves to accommodate at least a portion of the conductive member 5. In addition, the contact member 4 is connected to the second bottom surface. Since the second bottom surface and the first bottom surface form a step and are spaced apart, portions of the contact member 4 other than the fixed end 41 can be prevented from contacting the pole 2, thereby preventing deformation of the contact member 4.

[0090] For further information, please refer to Figure 2 and Figure 4In some embodiments, the adapter plate 3 is provided with a protrusion 31, which is disposed within the through-hole 11, and the contact member 4 is in detachable contact with the end surface of the protrusion 31. In other words, the through-hole 11 is provided to achieve an indirect connection between the terminal 2 and the adapter plate 3. The protrusion 31 passing through the through-hole 11 facilitates the connection between the contact member 4 or the conductive member 5 and the adapter plate 3.

[0091] In addition, if Figure 2 and Figure 4 As shown, in some embodiments, along the thickness direction of the top cover assembly (i.e., along the X-axis), the height of the protrusion 31 is lower than the height of the upper surface of the through hole 11. This helps to ensure sufficient space between the adapter plate 3 and the pole 2 for the installation of the conductive member 5.

[0092] Furthermore, the through hole 11 includes a first hole and a second hole that are coaxial and connected, the first hole and the second hole form a stepped hole, and the inner diameter of the first hole is larger than the inner diameter of the second hole, the first hole is close to the pole 2, and the protrusion 31 includes a matching portion and an overlapping portion, the matching portion and the overlapping portion form a T-shaped protrusion 31, the matching portion is used to match with the second hole, and the overlapping portion is used to overlap with the inner straight surface connecting the first hole and the second hole.

[0093] In this case, if Figure 2 and Figure 4 As shown, in some embodiments, the first insulating seal 6 includes a second insulating seal 61 and a third insulating seal 62, the second insulating seal 61 is arranged between the protrusion 31 and the through hole 11, and the third insulating seal 62 is arranged between the portion of the adapter plate 3 other than the protrusion 31 and the cover plate 1.

[0094] In addition to the above-mentioned top cover assembly, the present invention also provides a battery including the top cover assembly disclosed in the above-mentioned embodiment. For the structures of other parts of the battery, please refer to the relevant technology and will not be described in detail herein.

[0095] The key point of this embodiment is that the top cover assembly disclosed in any one of the above embodiments has the same beneficial effects as the above top cover assembly.

[0096] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0097] The above describes in detail the top cover assembly and battery provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A top cover assembly, characterized in that: include: A cover plate (1) having a through hole (11); A pole (2) is provided on the outside of the cover plate (1) and is insulated and connected to the cover plate (1); An adapter plate (3) is provided on the inner side of the cover plate (1) and is insulated and connected to the cover plate (1); The contact member (4) comprises a fixed end (41) and a movable end (42), wherein the fixed end (41) is connected to the pole (2), and the movable end (42) extends to the through hole (11) and is in detachable contact with the adapter plate (3).

2. The top cover assembly according to claim 1, wherein: A conductive member (5) is connected to a side of the movable end (42) close to the adapter plate (3), and an area of ​​a side of the conductive member (5) close to the movable end (42) is smaller than an area of ​​a side of the conductive member (5) close to the adapter plate (3).

3. The top cover assembly according to claim 2, wherein: The movable end (42) is provided with an opening (43).

4. The top cover assembly according to claim 3, wherein: At least part of the side walls on both sides of the opening (43) are fixedly connected to form a connecting portion.

5. The top cover assembly according to claim 4, wherein: The conductive member (5) covers the connecting portion.

6. The top cover assembly according to claim 3, wherein: The contact member (4) is provided with a hollow hole (44), and the hollow hole (44) is communicated with the opening (43).

7. The top cover assembly according to claim 3, wherein: The width of the contact member (4) gradually increases from the end of the movable end (42) to the fixed end (41); and / or, The width of the opening (43) gradually increases from the end of the movable end (42) to the fixed end (41).

8. The top cover assembly according to any one of claims 1 to 7, characterized in that: The cover plate (1) is an insulating member; and / or, A first insulating seal (6) is provided between the cover plate (1) and the adapter plate (3), and a fourth insulating seal (7) is provided between the cover plate (1) and the pole (2).

9. The top cover assembly according to any one of claims 1 to 7, characterized in that: The pole (2) is provided with a groove (21), the groove (21) comprises a first bottom surface and a second bottom surface forming a step, the depth of the first bottom surface is greater than the depth of the second bottom surface, and the contact member (4) is connected to the second bottom surface; and / or, The adapter plate (3) is provided with a protrusion (31), the protrusion (31) is provided in the through hole (11), and the contact member (4) is in detachable contact with the end surface of the protrusion (31).

10. The top cover assembly according to claim 9, wherein: Along the thickness direction of the top cover assembly, the height of the protrusion (31) is lower than the height of the upper surface of the through hole (11).

11. The top cover assembly according to any one of claims 1 to 7, characterized in that: The contact piece (4) is a bimetallic sheet, a trimetallic sheet or a memory metal sheet.

12. A battery, characterized in that: The invention comprises the top cover assembly according to any one of claims 1 to 11.

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