Top cover structure and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover structure and a battery cell, the top cover structure comprises a cover plate, a lower insulating part and a spoiler, the cover plate is provided with a first exhaust port for arranging an explosion-proof valve, the lower insulating part is arranged on the inner side of the cover plate, and the lower insulating part is provided with a second exhaust port. At least part of the second exhaust port coincides with the first exhaust port in the first direction. And the spoiler is arranged at the second exhaust port and is connected with the lower insulating part. A ventilation structure is arranged between the spoiler and the lower insulating part and / or on the spoiler, and the ventilation structure is communicated with the interior of the shell and the first exhaust port. According to the top cover structure and the battery cell provided by the invention, the exhaust smoothness and effectiveness of the explosion-proof valve are ensured, electrolyte in the shell is prevented from entering the space between the cover plate and the lower insulating part through the second exhaust port, the probability that the electrolyte impacts the explosion-proof valve is reduced, and the service life of the battery cell is prolonged. And the probability that the explosion-proof valve is broken through by electrolyte, so that the explosion-proof valve is opened in advance and fails, and the battery cell leaks liquid is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a top cover structure and an electric core. Background Art

[0002] With the development of battery technology, the energy storage capacity of batteries has gradually increased, and the capacity of the electrolyte loaded inside the electric core has gradually increased. And currently, an explosion-proof valve is usually provided on the battery top cover for the electric core. To ensure the safety during the use of the battery, a thinning area that is easy for high-pressure gas to break through is usually provided on the explosion-proof valve.

[0003] Currently, a cavity is formed between the inner end plate of the electric core and the explosion-proof valve. To ensure the exhaust effectiveness of the explosion-proof valve, the cavity needs to have an exhaust hole communicating with the inside of the electric core, which makes the electrolyte inside the electric core easily accumulate in the cavity through the exhaust hole. Once the battery faces vibrations, shakes, collisions, drops and other situations, the excess electrolyte inside the electric core and / or the electrolyte accumulated in the cavity will impact the electric core housing from the inside. Once it impacts the thinning area of the explosion-proof valve, it is very easy to break through the explosion-proof valve, resulting in problems such as premature opening failure of the explosion-proof valve and leakage of the electric core. Summary of the Utility Model

[0004] The purpose of the present application is to provide a top cover structure and an electric core, so as to solve to a certain extent the technical problems existing in the prior art that once the battery faces vibrations, shakes, collisions, drops and other situations, the excess electrolyte inside the electric core and / or the electrolyte accumulated in the cavity will impact the electric core housing from the inside. Once it impacts the thinning area of the explosion-proof valve, it is very easy to break through the explosion-proof valve, resulting in premature opening failure of the explosion-proof valve and leakage of the electric core.

[0005] According to a first aspect of the present application, a top cover structure is provided for an electric core. The electric core includes a housing and the top cover structure, and the top cover structure covers one side of the housing in a first direction.

[0006] The top cover structure includes a cover plate, a lower insulating member and a flow blocking piece. The cover plate is provided with a first exhaust port for setting an explosion-proof valve. The lower insulating member is arranged inside the cover plate, and the lower insulating member is provided with a second exhaust port.

[0007] Along the first direction, at least a part of the second exhaust port coincides with the first exhaust port.

[0008] The flow blocking piece is arranged at the second exhaust port and is connected to the lower insulating member.

[0009] A breathable structure is provided between the flow blocking piece and the lower insulating member and / or on the flow blocking piece, and the breathable structure communicates the inside of the housing and the first exhaust port.

[0010] Preferably, the flow blocking sheet is detachably connected to the lower insulating member.

[0011] Preferably, the top cover structure further includes a first engaging member and a second engaging member that can be engaged with each other. The first engaging members are respectively provided at both ends of the flow blocking sheet in the second direction, and the second engaging member is provided on the inner wall of the second exhaust port. The flow blocking sheet is connected to the lower insulating member via the first engaging member and the second engaging member, and the second direction intersects the first direction.

[0012] Preferably, the flow blocking sheet is disposed on a side of the second exhaust port away from the cover plate.

[0013] Preferably, in the first direction, the distance from the flow blocking sheet to the side surface of the lower insulating member facing the cover plate is greater than or equal to 0.5 mm.

[0014] Preferably, the ventilation structure includes a first through hole provided in the flow blocking sheet, and the first through hole penetrates the flow blocking sheet in the first direction.

[0015] Preferably, the ventilation structure further includes a ventilation gap. The outer edge of the flow blocking sheet is located in the second exhaust port, and the ventilation gap is formed between the outer edge of the flow blocking sheet and the inner wall of the second exhaust port.

[0016] Preferably, the top cover structure further includes an end plate, and the end plate is disposed on a side of the lower insulating member facing away from the cover plate;

[0017] The end plate is provided with a ventilation net portion, and at least a part of the ventilation net portion overlaps with the first exhaust port in the first direction.

[0018] Preferably, the ventilation net portion is provided with a second through hole penetrating the end plate in the first direction;

[0019] In the first direction, at least a part of the second through hole is staggeredly arranged with the ventilation structure.

[0020] According to a second aspect of the present application, a battery cell is provided, including a housing and the top cover structure according to any one of the above technical solutions. Therefore, it has all the beneficial technical effects of the top cover structure, and will not be described in detail herein.

[0021] Compared with the prior art, the beneficial effects of the present application are as follows:

[0022] The top cover structure provided by the present application is provided with a second exhaust port at a position of the lower insulating member corresponding to the first exhaust port, and a baffle is provided at the second exhaust port, and a breathable structure connecting the interior of the shell and the first exhaust port is provided between the baffle and the lower insulating member and / or on the baffle. In this way, on the one hand, at least part of the second exhaust port overlaps with the first exhaust port in the first direction, and a breathable structure connecting the interior of the shell and the first exhaust port is provided between the baffle and the lower insulating member and / or on the baffle, which can effectively ensure the smoothness and effectiveness of the exhaust of the explosion-proof valve; on the other hand, the baffle provided at the second exhaust port can effectively block the electrolyte inside the shell from entering between the cover plate and the lower insulating member through the second exhaust port, thereby effectively reducing the probability of the electrolyte impacting the explosion-proof valve, and reducing the probability of the explosion-proof valve being broken by the electrolyte, resulting in premature opening of the explosion-proof valve and failure of the battery cell to leak.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the exploded structure of the top cover structure provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of the top cover structure at position A is provided;

[0027] Figure 3 A schematic diagram of a cross-sectional structure obtained by cross-sectioning a top cover structure provided by an embodiment of the present application along a plane defined by a first direction and a second direction;

[0028] Figure 4 A schematic diagram of another exploded structure of the top cover structure provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] 1-cover plate; 11-first exhaust port; 2-lower insulating member; 21-second exhaust port; 22-second clamping member; 3-end plate; 31-second through hole; 4-explosion-proof valve; 41-patch; 5-blocking plate; 511-first through hole; 52-first clamping member; 6-pole.

[0031] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed implementation manners

[0032] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application.

[0033] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0034] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0037] Next, refer to Figures 1 to 4 Describe the top cover structure and the battery cell according to some embodiments of the present application.

[0038] Refer to Figures 1 to 4As shown in the figure, an embodiment of the first aspect of the present application provides a top cover structure for an electric core. The electric core includes a housing and a top cover structure, and the top cover structure covers one side of the housing in the first direction F1. Among them, the top cover structure includes a cover plate 1, a lower insulating member 2, and a flow blocking piece 5. The cover plate 1 is provided with a first exhaust port 11 for arranging an explosion-proof valve 4. The lower insulating member 2 is arranged inside the cover plate 1, and the lower insulating member 2 is provided with a second exhaust port 21. Along the first direction F1, at least a part of the second exhaust port 21 coincides with the first exhaust port 11. The above-mentioned flow blocking piece 5 is arranged at the second exhaust port 21 and is connected to the lower insulating member 2. A breathable structure is arranged between the flow blocking piece 5 and the lower insulating member 2 and / or on the flow blocking piece 5, and the breathable structure communicates the inside of the housing and the first exhaust port 11.

[0039] According to the top cover structure provided by the above technical features, by arranging the second exhaust port 21 at the position of the lower insulating member 2 corresponding to the first exhaust port 11, arranging the flow blocking piece 5 at the second exhaust port 21, and arranging a breathable structure that communicates the inside of the housing and the first exhaust port 11 between the flow blocking piece 5 and the lower insulating member 2 and / or on the flow blocking piece 5. In this way, on the one hand, at least a part of the second exhaust port 21 coincides with the first exhaust port 11 in the first direction F1, and a breathable structure that communicates the inside of the housing and the first exhaust port 11 is arranged between the flow blocking piece 5 and the lower insulating member 2 and / or on the flow blocking piece 5, which can effectively ensure the exhaust smoothness and effectiveness of the explosion-proof valve 4; on the other hand, the flow blocking piece 5 arranged at the second exhaust port 21 can effectively block the electrolyte inside the housing from entering between the cover plate 1 and the lower insulating member 2 through the second exhaust port 21, and further can effectively reduce the probability of the electrolyte impacting the explosion-proof valve 4, and reduce the probability of problems such as the explosion-proof valve 4 being broken by the electrolyte and the explosion-proof valve 4 failing to open in advance and the electric core leaking liquid.

[0040] As Figures 1 to 4 shown in the figure, F1 shown in the figure can be an example of the above-mentioned first direction F1, and F2 shown in the figure can be an example of the following second direction F2. Among them, the first direction F1 and the second direction F2 intersect with each other. For the convenience of description, the plane perpendicular to both the first direction F1 and the second direction F2 is defined as the third direction F3, and F3 shown in the figure can be an example of this third direction F3. Preferably, the above-mentioned first direction F1 can be parallel to the length direction of the electric core. However, it is not limited thereto, and the first direction F1 can be adaptively adjusted according to the position where the top cover structure covers the housing.

[0041] Optionally, as Figure 3 shown in the figure, the explosion-proof valve 4 can be covered inside the above-mentioned cover plate 1, that is, on the side of the cover plate 1 facing the lower insulating member 2. It should be noted that the structure of the explosion-proof valve 4 and the connection structure between the explosion-proof valve 4 and the cover plate 1 are both prior arts in the field and will not be elaborated here.

[0042] Optionally, not shown in the figure, the above explosion-proof valve 4 can also be covered on the outside of the above cover plate 1.

[0043] Optionally, as Figure 1 and Figure 3 shown, the above top cover structure can also include a patch 41, which can be attached to the outside of the above cover plate 1 and cover the first exhaust port 11 to ensure the cleanliness and flatness of the outside of the cover plate 1.

[0044] In the embodiment, preferably, as Figures 1 to 3 shown, the above flow-blocking piece 5 and the lower insulating member 2 are detachably connected to facilitate the replacement and repair of the flow-blocking piece 5.

[0045] Preferably, as Figure 2 shown, the above top cover structure can also include a first engaging member 52 and a second engaging member 22 that can be engaged with each other. Among them, the two ends of the flow-blocking piece 5 in the second direction F2 are respectively provided with the first engaging member 52, and the inner wall of the second exhaust port 21 is provided with the second engaging member 22. The flow-blocking piece 5 is connected to the lower insulating member 2 via the first engaging member 52 and the second engaging member 22 to achieve the detachable connection of the flow-blocking piece 5 and the lower insulating member 2 by engagement.

[0046] Preferably, as Figures 1 to 4 shown, the above second direction F2 can be arranged parallel to the thickness direction of the battery cell. Correspondingly, the above third direction F3 can be parallel to the width direction of the battery cell to improve the engaging stability of the flow-blocking piece 5. However, it is not limited thereto. Not shown in the figure, the above second direction F2 can also be parallel to the width direction of the battery cell, and correspondingly, the above third direction F3 can be parallel to the thickness direction of the battery cell.

[0047] Optionally, as Figure 2 shows an example in which the above first engaging member 52 is a claw and the second engaging member 22 is a slot. However, it is not limited thereto. For example, not shown in the figure, the above first engaging member 52 can also be a slot, and correspondingly, the second engaging member 22 is a claw.

[0048] Preferably, as Figure 2 and Figure 3As shown, the flow blocking piece 5 is arranged on the side of the second exhaust port 21 away from the cover plate 1. In this way, the flow blocking piece 5 is arranged on the side of the second exhaust port 21 away from the cover plate 1, which can form a predetermined space between the cover plate 1 and the flow blocking piece 5. On the one hand, the existence of this predetermined space can prevent the flow blocking piece 5 from contacting the explosion-proof valve 4, which can not only prevent the flow blocking piece 5 from interfering with the normal use of the explosion-proof valve 4, but also prevent the explosion-proof valve 4 from being damaged when the flow blocking piece 5 is assembled; on the other hand, forming this predetermined space between the cover plate 1 and the flow blocking piece 5 can provide a predetermined storage space for the electrolyte flowing into the second exhaust port 21, which is convenient for reducing the flow rate of the electrolyte, thereby alleviating the impact of the electrolyte on the explosion-proof valve 4 and facilitating the reflux of the electrolyte.

[0049] Preferably, as Figure 3 shown, in the first direction F1, the distance from the flow blocking piece 5 to the side of the lower insulating part 2 facing the cover plate 1 (i.e., Figure 3 the t value shown) is greater than or equal to 0.5 mm.

[0050] Preferably, as Figure 2 and Figure 3 shown, the above-mentioned second clamping part 22 can be a claw extending along the first direction F1 to further expand the above-mentioned predetermined space. It should be noted that the above-mentioned t value can be understood as the distance between the upper edge of the claw and the side of the lower insulating part 2 facing the cover plate 1.

[0051] Preferably, as Figure 2 shown, the above-mentioned ventilation structure can include a first through hole 511 provided on the flow blocking piece 5, and the first through hole 511 penetrates the flow blocking piece 5 along the first direction F1 to facilitate the gas inside the battery cell to be discharged through the first through hole 511.

[0052] Optionally, as Figure 2 shown, the above-mentioned first through hole 511 can be in the shape of a grille hole, however, it is not limited thereto. As long as the air permeability of the flow blocking piece 5 can be realized, the above-mentioned first through hole 511 can also be in other forms. For example, the first through hole 511 can be in the shape of a mesh hole, a mesh-like hole, an array hole, a spiral hole or other special-shaped hollow holes.

[0053] Preferably, not shown in the figure, the ventilation structure further includes a ventilation gap. The outer edge of the flow blocking piece 5 is located inside the second exhaust port 21, and a ventilation gap is formed between the outer edge of the flow blocking piece 5 and the inner wall of the second exhaust port 21 to further ensure the smooth exhaust of the second exhaust port 21.

[0054] Optionally, as Figure 2 shown, the number of the above-mentioned flow blocking pieces 5 can be 1, and the flow blocking piece 5 is adapted to the shape of the second exhaust port 21.

[0055] Optionally, not shown in the figure, the number of the above-mentioned flow blocking sheets 5 can be multiple, and the multiple flow blocking sheets 5 are arranged at intervals along the first direction F1 to improve the flow blocking effect of the flow blocking sheet 5.

[0056] Preferably, not shown in the figure, when the number of the flow blocking sheets 5 is multiple, the first through holes of each layer of flow blocking sheets are arranged staggeredly along the first direction to further improve the flow blocking effect of the flow blocking sheet 5.

[0057] In the embodiment, as Figures 1 to 4 shown, the above-mentioned top cover structure may further include an end plate 3, and the end plate 3 is arranged on the side of the lower insulating member 2 facing away from the cover plate 1 to define the position of the electrode group in the battery cell. Wherein, the end plate 3 may be provided with a breathable mesh portion, and at least a part of the breathable mesh portion overlaps with the first exhaust port 11 in the first direction F1 to ensure the smoothness and effectiveness of the exhaust of the explosion-proof valve 4.

[0058] Preferably, as Figures 1 to 4 shown, the above-mentioned first exhaust port 11, the second exhaust port 21 and the breathable mesh portion are arranged opposite to each other in sequence along the first direction F1.

[0059] Preferably, as Figure 3 and Figure 4 shown, the breathable mesh portion is provided with a second through hole 31 penetrating the end plate 3 along the first direction F1 for communicating the inside of the housing and the second exhaust port 21 to achieve the smoothness of the exhaust of the end plate 3 at the position of the first exhaust port 11.

[0060] Preferably, along the first direction F1, at least a part of the second through holes 31 is arranged staggeredly with the above-mentioned breathable structure to further prevent the electrolyte from flowing between the explosion-proof valve 4 and the lower insulating member 2.

[0061] Optionally, the staggered arrangement of the second through hole 31 and the breathable structure may include the staggered arrangement of the first through hole 511 and the second through hole 31 in the first direction F1.

[0062] Optionally, the staggered arrangement of the second through hole 31 and the breathable structure may further include the staggered arrangement of the above-mentioned breathable gap and the second through hole 31 in the first direction F1.

[0063] Optionally, the above-mentioned lower insulating member 2 may be a workpiece made of an insulating material such as a plastic part or a rubber part.

[0064] Optionally, the above-mentioned flow blocking member may be a workpiece made of a hard material such as an epoxy resin part, a metal part or a plastic part.

[0065] An embodiment of the second aspect of the present application further provides a battery cell, including the above-mentioned housing and the top cover structure of any of the above embodiments. Therefore, it has all the beneficial technical effects of the top cover structure and will not be elaborated herein.

[0066] Preferably, as Figure 1 and Figure 4 shown, the above-mentioned battery cell may further include a terminal post 6, and the terminal post 6 may be disposed on the above-mentioned cover plate 1.

[0067] Preferably, not shown in the figure, the above-mentioned battery cell may further include the above-mentioned electrode group, and the electrode group is disposed inside the housing.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A top cover structure for a battery cell, characterized in that: The battery cell comprises a shell and the top cover structure, wherein the top cover structure is disposed on one side of the shell in the first direction; The top cover structure includes a cover plate, a lower insulating member and a spoiler, the cover plate is provided with a first exhaust port for setting an explosion-proof valve, the lower insulating member is arranged on the inner side of the cover plate, and the lower insulating member is provided with a second exhaust port; Along the first direction, at least a portion of the second exhaust port overlaps with the first exhaust port; The baffle is arranged at the second exhaust port and connected to the lower insulating member; A breathable structure is provided between the spoiler and the lower insulating member and / or on the spoiler, and the breathable structure is connected with the interior of the shell and the first exhaust port.

2. The top cover structure according to claim 1, characterized in that: The spoiler is detachably connected to the lower insulating member.

3. The top cover structure according to claim 2, characterized in that: The top cover structure also includes a first clip and a second clip that can be snap-fitted with each other, the first clips are respectively provided at both ends of the spoiler in the second direction, the second clip is provided on the inner wall of the second exhaust port, the spoiler is connected to the lower insulating member via the first clip and the second clip, and the second direction intersects with the first direction.

4. The top cover structure according to claim 1, characterized in that: The baffle is arranged on a side of the second exhaust port away from the cover plate.

5. The top cover structure according to claim 4, characterized in that: In the first direction, a distance from the spoiler to a side surface of the lower insulating member facing the cover plate is greater than or equal to 0.5 mm.

6. The top cover structure according to claim 1, characterized in that: The air-permeable structure includes a first through hole disposed on the baffle, and the first through hole penetrates the baffle along the first direction.

7. The top cover structure according to claim 1, characterized in that: The air-permeable structure further includes an air-permeable gap. The outer edge of the baffle is located in the second exhaust port, and the air-permeable gap is formed between the outer edge of the baffle and the inner wall of the second exhaust port.

8. The top cover structure according to any one of claims 1 to 7, characterized in that: The top cover structure further includes an end plate, which is arranged on a side of the lower insulating member facing away from the cover plate; The end plate is provided with an air-permeable mesh portion, and at least a portion of the air-permeable mesh portion is overlapped with the first exhaust port in the first direction.

9. The top cover structure according to claim 8, characterized in that: The air-permeable mesh portion is provided with a second through hole penetrating through the end plate along the first direction; Along the first direction, at least part of the second through holes and the air-permeable structure are staggered.

10. A battery cell, characterized in that: The invention comprises the housing and the top cover structure according to any one of claims 1 to 9.

Images