Cover plate structure and battery cell
By setting the flow barrier and air gap of the lower plastic parts in the cover plate structure, the problem of electrolyte impacting the explosion-proof valve when the battery cell vibrates is solved, and the smoothness of the explosion-proof valve and the safety of the battery cell are achieved.
Patent Information
- Application Number
- CN202421911919.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-08
AI Technical Summary
In the case of vibration, shaking, collision, falling, etc., the electrolyte is easily accumulated in the cavity through the exhaust hole and impacts the explosion-proof valve, resulting in the early opening of the explosion-proof valve failing and the battery cell leaking.
The first exhaust area of the lower plastic part is arranged in the cover plate structure, and the flow barrier ribs are covered and an air gap is formed to prevent the electrolyte from directly impacting the explosion-proof valve, and the amount of electrolyte entering between the lower plastic part and the cover plate body is reduced under the cover plate barrier.
Effectively block the electrolyte from impacting the explosion-proof valve, avoid failure of the valve opening in advance and leakage of the battery cell, and improve the safety and stability of the battery cell.
Smart Images
Figure CN223052220U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a cover plate structure and a battery cell. Background Art
[0002] With the development of battery technology, the energy storage capacity of batteries has gradually increased, and the electrolyte capacity loaded inside the battery cells has gradually increased. In addition, today's battery cells usually have explosion-proof valves on the top cover of the battery. In order to ensure the safety of the battery during use, the explosion-proof valve is usually provided with a thinned area to facilitate the high-pressure gas to break through.
[0003] A cavity is formed between the inner end plate of the current battery cell and the explosion-proof valve. In order to ensure the exhaust effectiveness of the explosion-proof valve, the cavity needs to have an exhaust hole connected to the interior of the battery cell. This makes it easy for the electrolyte inside the battery cell to accumulate in the cavity through the exhaust hole. Once the battery is facing vibration, shaking, collision, falling, etc., the excess electrolyte inside the battery cell and / or the electrolyte accumulated in the cavity will impact the battery cell case from the inside. Once it impacts the thinned area of the explosion-proof valve, it is very easy to break through the explosion-proof valve, resulting in the explosion-proof valve opening failure prematurely, battery cell leakage and other problems. Utility Model Content
[0004] The purpose of the present application is to provide a cover plate structure and a battery cell, so as to solve, to a certain extent, the technical problems existing in the prior art that once the battery is faced with vibration, shaking, collision, falling, etc., the excess electrolyte inside the battery cell and / or the electrolyte accumulated in the cavity will impact the battery cell shell from the inside, and once it impacts the thinned area of the explosion-proof valve, it is very easy to break through the explosion-proof valve, resulting in premature opening of the explosion-proof valve and failure, battery cell leakage, etc.
[0005] According to a first aspect of the present application, a cover plate structure is provided for a battery cell, comprising a cover plate body, an explosion-proof valve and a lower plastic part, wherein the cover plate body is provided with an explosion-proof opening for providing the explosion-proof valve, the lower plastic part is provided on the inner side of the cover plate body, and the lower plastic part and the cover plate body are arranged facing each other in a first direction, the lower plastic part is provided with a first exhaust area, and the first exhaust area is arranged facing the explosion-proof opening in the first direction;
[0006] The lower plastic part includes a plurality of baffle ribs, the plurality of baffle ribs are fully distributed in the first exhaust area, and air gaps are formed between the plurality of baffle ribs.
[0007] Preferably, the lower plastic part comprises a baffle layer, the baffle ribs extend along the second direction, and a plurality of the baffle ribs are arranged at intervals in the third direction to form the baffle layer;
[0008] In the baffle layer, an air passing gap extending in the second direction is formed between two adjacent baffle ribs. The second direction intersects the third direction, and the first direction intersects the plane determined by the second direction and the third direction.
[0009] Preferably, the second direction is parallel to the width direction of the battery cell;
[0010] Or the second direction is parallel to the thickness direction of the battery cell.
[0011] Preferably, the lower plastic part further includes an insulating body, and the part of the lower plastic part other than the first exhaust area is the insulating body;
[0012] In the first direction, the size of the baffle rib is smaller than the size of the insulating body.
[0013] Preferably, one or more layers of the baffle layers are arranged in the first exhaust area;
[0014] When the number of the baffle layers is multiple, the multiple baffle layers are arranged at intervals in the first direction.
[0015] Preferably, when the number of the baffle layers is multiple, in the first direction, the air passing gaps and the baffle ribs are arranged alternately.
[0016] Preferably, it further includes an end plate part, and the end plate part is arranged on the side of the lower plastic part facing away from the cover plate body;
[0017] The end plate part is provided with a second exhaust area, and in the first direction, the second exhaust area is arranged opposite to the explosion-proof port;
[0018] An exhaust hole penetrating the end plate part in the first direction is arranged in the second exhaust area.
[0019] Preferably, the number of the exhaust holes is multiple, and the multiple exhaust holes are arranged in a matrix.
[0020] Preferably, in the first direction, the baffle rib can block at least part of the exhaust holes.
[0021] According to the second aspect of the present application, a battery cell is provided, including the cover plate structure described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this cover plate structure, and will not be elaborated here.
[0022] Compared with the prior art, the beneficial effects of the present application are as follows:
[0023] The cover structure provided by the present application has a first exhaust area on the lower plastic part that is disposed opposite to the explosion-proof port. The flow-blocking ribs are densely distributed in this first exhaust area, and an air passage gap is formed between the multiple flow-blocking ribs. In this way, while ensuring the smoothness and effectiveness of the explosion-proof valve's exhaust, the cover structure can not only effectively block the electrolyte inside the battery cell from directly impacting the explosion-proof valve through the flow-blocking ribs, but also, under the shielding effect of the flow-blocking ribs, significantly reduce the amount of electrolyte that can enter between the lower plastic part and the cover body. Furthermore, when the battery is subjected to vibrations, shakes, collisions, drops, etc., the excess electrolyte inside the battery cell and / or the electrolyte accumulated in the cavity will not impact the explosion-proof valve from the inside, thus avoiding problems such as the electrolyte breaking through the explosion-proof valve, resulting in the premature opening failure of the explosion-proof valve and the leakage of the battery cell.
[0024] To make the above objects, features, and advantages of the present application more clearly understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, provides a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0026] Figure 1 Exploded structural schematic diagram of the cover structure provided by the embodiment of the present application;
[0027] Figure 2 Axonometric structural schematic diagram of the lower plastic part provided by the embodiment of the present application;
[0028] Figure 3 Another exploded structural schematic diagram of the cover structure provided by the embodiment of the present application;
[0029] Figure 4 Sectional structural schematic diagram of the cover structure provided by the embodiment of the present application.
[0030] Reference Numerals:
[0031] 1 - Cover body; 11 - Explosion-proof port; 2 - Lower plastic part; 21 - First exhaust area; 211 - Flow-blocking rib; 212 - Air passage gap; 22 - Insulating body; 3 - End plate part; 31 - Second exhaust area; 311 - Exhaust hole; 4 - Explosion-proof valve; 41 - Patch; 5 - Terminal post.
[0032] L - Length direction; W - Width direction; T - Thickness direction. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.
[0034] 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 drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application.
[0035] 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.
[0036] 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 drawings, and 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 therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0037] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" 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 circumstances.
[0038] Next, refer to Figures 1 to 4 Describe a cover structure and an electric core according to some embodiments of the present application.
[0039] See Figures 1 to 4As shown, an embodiment of the first aspect of the present application provides a cover structure for a battery cell. It includes a cover body 1, an explosion-proof valve 4, and a lower plastic part 2. An explosion-proof port 11 for arranging the explosion-proof valve 4 is provided on the cover body 1. The lower plastic part 2 is arranged inside the cover body 1, and in the first direction, the lower plastic part 2 and the cover body 1 are arranged facing each other. The lower plastic part 2 is provided with a first exhaust area 21, and in the first direction, the first exhaust area 21 is arranged directly opposite to the explosion-proof port 11. The lower plastic part 2 includes a plurality of flow-blocking ribs 211, the plurality of flow-blocking ribs 211 are densely distributed in the first exhaust area 21, and an air passage gap 212 is formed between the plurality of flow-blocking ribs 211.
[0040] According to the cover structure provided by the above technical features, by arranging the first exhaust area 21 of the lower plastic part 2 directly opposite to the explosion-proof port 11, the flow-blocking ribs 211 are densely distributed in the first exhaust area 21, and an air passage gap 212 is formed between the plurality of flow-blocking ribs 211. In this way, on the premise of ensuring the smoothness and effectiveness of the explosion-proof valve 4 exhausting gas, the cover structure can not only effectively block the electrolyte inside the battery cell from directly impacting the explosion-proof valve 4 through the flow-blocking ribs 211, but also under the shielding effect of the flow-blocking ribs 211, the amount of electrolyte that can enter between the lower plastic part 2 and the cover body 1 inside the battery cell is greatly reduced. Furthermore, when the battery faces situations such as vibration, shaking, collision, and dropping, the excess electrolyte inside the battery cell and / or the electrolyte accumulated in the cavity will not impact the explosion-proof valve 4 from the inside, thus avoiding problems such as the explosion-proof valve 4 opening in advance and the battery cell leaking due to the electrolyte breaking through the explosion-proof valve 4.
[0041] As Figures 1 to 4 shown, an example of a blade battery cell is shown in the figure. For the convenience of describing the orientation, the length direction L, width direction W, and thickness direction T of the battery cell are marked. Specifically, the L shown in the figure can be an example of the length direction L, the W shown in the figure can be an example of the width direction W, and the T shown in the figure can be an example of the thickness direction T.
[0042] It should be noted that the cover structure provided by the present application is not limited to the blade battery cell shown in the figure, and the cover structure can also be applied to cylindrical battery cells or other special-shaped battery cells.
[0043] Optionally, taking the end of the above cover structure arranged in the length direction L of the battery cell as an example, the above first direction can be parallel to the length direction L. However, it is not limited thereto, and the first direction can be adaptively adjusted according to the position of the cover structure arranged on the battery cell.
[0044] Preferably, the above lower plastic part 2 can include a flow-blocking plate layer. Specifically, as Figures 1 to 3As shown, the above-mentioned baffle ribs 211 can extend along the second direction, and the multiple baffle ribs 211 can be arranged at intervals in the third direction to form the baffle plate layer. In this way, in the baffle plate layer, an air passage gap 212 extending along the second direction is formed between two adjacent baffle ribs 211. Among them, the second direction intersects with the third direction, and the first direction intersects with the plane determined by both the second direction and the third direction.
[0045] Preferably, as Figures 1 to 3 shown, an example is shown in the figure where the second direction is parallel to the width direction W, and correspondingly, the third direction is parallel to the thickness direction T.
[0046] However, it is not limited to this. As not shown in the figure, the second direction can also be parallel to the thickness direction T, and correspondingly, the third direction can be parallel to the width direction W.
[0047] It should be noted that the second direction is not limited to the example of being parallel to the width direction W or the thickness direction T. As long as it can block the electrolyte, the second direction (i.e., the extension direction of the baffle rib 211) can also form a certain angle with the width direction W or the thickness direction T.
[0048] Preferably, as Figures 1 to 3 shown, the above-mentioned baffle rib 211 can be in a straight strip shape. However, it is not limited to this. As long as it can block the electrolyte, the baffle rib 211 can also be in a wavy shape, a broken line shape, or other irregular line shapes.
[0049] Optionally, the above-mentioned lower plastic part 2 can be an insulating material such as PP, PET, or PE.
[0050] Optionally, the above-mentioned lower plastic can be integrally injection molded.
[0051] In addition, it should also be noted that the above-mentioned baffle plate layer can be understood as that the multiple baffle ribs 211 are all arranged in the same plate layer space, that is, the multiple baffle ribs 211 are aligned in the first direction. Optionally, the multiple baffle ribs 211 included in the baffle plate layer can be formed by separating a whole piece of plate through air passage gaps. As Figure 2 shown, an example is shown where the baffle plate layer is separated into three baffle ribs 211 by two air passage gaps.
[0052] Preferably, as Figure 2 shown, the lower plastic part 2 can also include an insulating body 22. Among them, the part of the lower plastic part 2 outside the first exhaust area 21 is the insulating body 22 to achieve insulation between the part of the cover body 1 not corresponding to the first exhaust area 21 and the inside of the battery cell.
[0053] Preferably, in the first direction, the size of the baffle rib 211 is smaller than that of the insulating body 22. In other words, the thickness of the part corresponding to the first exhaust area 21 of the lower plastic part 2 is smaller than that of the insulating body 22. In this way, a buffer space can be formed between the position corresponding to the first exhaust area 21 and between the lower plastic part 2 and the cover plate body 1. In this way, on the one hand, when the gas inside the battery cell enters between the lower plastic part 2 and the cover plate body 1 through the gas passing gap, setting this buffer space can effectively reduce the gas pressure and flow rate, and thus can relieve the exhaust pressure of the explosion-proof valve 4 and improve the safety of the battery cell; on the other hand, this buffer space provides a certain storage space for the electrolyte. Once the electrolyte enters between the lower plastic part 2 and the cover plate body 1 through the gas passing gap, the electrolyte can be stored in this buffer space and then seep back into the battery cell through the gas passing gap, avoiding the direct impact of the electrolyte on the explosion-proof valve 4.
[0054] Optionally, as Figure 2 shown, the figure shows an example in which a layer of the baffle plate layer is provided in the above-mentioned first exhaust area 21.
[0055] However, it is not limited to this. As long as the space between the lower plastic part 2 and the cover plate body 1 is sufficient (not shown in the figure), multiple layers of baffle plate layers can also be provided in the above-mentioned first exhaust area 21.
[0056] Optionally, not shown in the figure, if the number of baffle plate layers is multiple, the multiple baffle plate layers are arranged at intervals in the first direction, so as to ensure the smooth exhaust between the layers of baffle plate layers.
[0057] Preferably, not shown in the figure, when the number of baffle plate layers is multiple, in the first direction, the gas passing gaps 212 and the baffle ribs 211 are arranged alternately. Taking the number of baffle plate layers as two layers as an example, the "in the first direction, the gas passing gaps 212 and the baffle ribs 211 are arranged alternately" here can be understood as that, when observing in the first direction, the gas passing gaps in the first layer of baffle plate layer can be blocked by the baffle ribs 211 in the second layer of baffle plate layer. In this way, it further prevents the electrolyte from entering between the lower plastic part 2 and the cover plate body 1 through the gas passing gaps.
[0058] Optionally, the above-mentioned cover plate body 1 can be a light aluminum plate structure.
[0059] It should be noted that the connection structure between the above-mentioned cover plate body 1 and the explosion-proof valve 4 is the prior art in this field and will not be elaborated here.
[0060] In the embodiment, preferably, as Figure 1 、 Figure 3 and Figure 4 shown, the above-mentioned cover plate structure can further include an end plate part 3, and the end plate part 3 can be arranged on the side of the above-mentioned lower plastic part 2 facing away from the cover plate body 1 to be used for defining the position of the electrode group inside the battery cell.
[0061] Correspondingly, as shown in Figure 1 , Figure 3 and Figure 4 , the end plate portion 3 may further be provided with a second exhaust region 31. In the first direction, the second exhaust region 31 is disposed opposite to the explosion-proof port 11. An exhaust hole 311 penetrating the end plate portion 3 in the first direction is provided in the second exhaust region 31. In this way, the exhaust smoothness of the first exhaust region 21 and the explosion-proof port 11 and the effectiveness of the explosion-proof valve 4 are ensured.
[0062] Preferably, as shown in Figure 3 , the number of the exhaust holes 311 is multiple, and the multiple exhaust holes 311 are arranged in a matrix.
[0063] Preferably, in the first direction, the baffle rib 211 can block at least part of the exhaust holes 311. Preferably, as shown in Figure 3 and Figure 4 , when observed in the first direction, the above-mentioned exhaust holes 311 and the exhaust gap are arranged staggeredly. In this way, it is prevented that the electrolyte enters the exhaust gap through the exhaust holes 311.
[0064] Optionally, as shown in Figure 1 , the above-mentioned cover plate structure may further include a terminal post 5, and the terminal post 5 may be disposed on a part of the above-mentioned cover plate body 1 opposite to the insulating body 22.
[0065] Optionally, as shown in Figure 1 , a connection hole penetrating the lower plastic part 2 in the first direction may further be provided in the above-mentioned insulating body 22, so as to facilitate the electrical connection between the terminal post 5 and the electrode group.
[0066] An embodiment of the second aspect of the present application further provides an electric core, including the cover plate structure described in any one of the above embodiments. Therefore, it has all the beneficial technical effects of the cover plate structure, and will not be elaborated here.
[0067] Preferably, not shown in the figure, the above-mentioned electric core may further include a housing and an electrode group. The above-mentioned cover plate structure may cover an end portion of the housing in the first direction. The electrode group is disposed in a space formed by enclosing the housing and the above-mentioned cover plate structure.
[0068] Optionally, as shown in Figure 1 and Figure 4 , the above-mentioned electric core may further include a patch 41, and the patch 41 may be attached to an outer surface of the above-mentioned cover plate body 1 and can cover the explosion-proof valve 4 to ensure the flatness and cleanliness of the outer surface of the cover plate body 1. It should be noted that the above-mentioned patch 41 is a prior art in the art and will not be elaborated here.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit 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 described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A cover plate structure for a battery cell, characterized in that: The invention comprises a cover body, an explosion-proof valve and a lower plastic part, wherein the cover body is provided with an explosion-proof opening for setting the explosion-proof valve, the lower plastic part is provided on the inner side of the cover body, and the lower plastic part and the cover body are arranged facing each other in a first direction, the lower plastic part is provided with a first exhaust area, and the first exhaust area is arranged facing the explosion-proof opening in the first direction; The lower plastic part includes a plurality of baffle ribs, the plurality of baffle ribs are fully distributed in the first exhaust area, and air gaps are formed between the plurality of baffle ribs.
2. The cover plate structure according to claim 1, characterized in that: The lower plastic part includes a baffle layer, the baffle ribs extend along the second direction, and a plurality of the baffle ribs are arranged at intervals in the third direction to form the baffle layer; In the baffle layer, an air gap extending along the second direction is formed between two adjacent baffle ribs, the second direction intersects the third direction, and the first direction intersects a plane defined by the second direction and the third direction.
3. The cover plate structure according to claim 2, characterized in that: The second direction is parallel to the width direction of the battery cell; Or the second direction is parallel to the thickness direction of the battery cell.
4. The cover plate structure according to claim 2, characterized in that: The lower plastic part further includes an insulating body, and the portion of the lower plastic part other than the first exhaust area is the insulating body; In the first direction, the size of the baffle rib is smaller than the size of the insulating body.
5. The cover plate structure according to claim 2, characterized in that: One or more baffle layers are provided in the first exhaust region; When the number of the baffle plate layers is multiple, the multiple baffle plate layers are arranged at intervals along the first direction.
6. The cover plate structure according to claim 5, characterized in that: When the number of the baffle plate layers is multiple, in the first direction, the air gaps and the baffle ribs are alternately arranged.
7. The cover plate structure according to any one of claims 2 to 6, characterized in that: It also includes an end plate portion, which is arranged on a side of the lower plastic part facing away from the cover plate body; The end plate is provided with a second exhaust area, and the second exhaust area is arranged opposite to the explosion-proof opening in the first direction; The second exhaust region is provided with an exhaust hole penetrating the end plate portion along the first direction.
8. The cover plate structure according to claim 7, characterized in that: There are multiple exhaust holes, and the multiple exhaust holes are arranged in a matrix.
9. The cover plate structure according to claim 7, characterized in that: In the first direction, the baffle rib can cover at least a portion of the exhaust hole.
10. A battery cell, characterized in that: The invention comprises the cover plate structure according to any one of claims 1 to 9.