Battery top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover assembly and a battery, the battery top cover assembly comprises a cover plate, a safety piece and an explosion-proof valve, the safety piece is arranged on one side of the cover plate facing a battery cell along a first direction, the explosion-proof valve is arranged on the safety piece, a communication port is arranged on the cover plate in a penetrating manner, and the communication port is communicated with the battery cell. The communicating port and the anti-explosion valve are arranged in a spaced mode in the second direction, a communicating channel is arranged between the communicating port and the anti-explosion valve, and an included angle is formed between the first direction and the second direction. According to the battery top cover assembly disclosed by the embodiment of the invention, the safety piece provided with the anti-explosion valve is arranged on the inner side, facing the battery cell, of the cover plate along the first direction, and the communication port, communicated with the anti-explosion valve, in the cover plate and the anti-explosion valve are arranged at an interval along the second direction, so that one side, far away from the battery cell along the first direction, of the anti-explosion valve is protected by the cover plate; the explosion-proof valve can be prevented from being directly subjected to external impact, and the protection performance of the explosion-proof valve is improved, so that the service life of the battery is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover assembly and a battery. Background Art

[0002] The battery cover plate assembly is an important part of the battery. Generally, the battery includes a cover plate, a housing, a battery cell, etc. Among them, the battery cell is placed inside the housing, the cover plate is sealed and installed at the upper opening of the housing, and the cover plate is provided with a liquid injection hole for injecting electrolyte into the housing and an explosion-proof valve for preventing the whole battery from exploding due to excessive temperature and pressure inside the battery. The prior art has the following defects: the explosion-proof valve exposed outside the cover plate is easily impacted by the outside, resulting in damage to the explosion-proof valve and affecting the service life of the battery. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a battery top cover assembly and a battery, which have a simple structure and the explosion-proof valve is arranged inside the cover plate with good protection performance.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] In the first aspect, a battery top cover assembly is provided, including a cover plate, a safety member and an explosion-proof valve. The safety member is arranged on the side of the cover plate facing the battery cell along a first direction, and the explosion-proof valve is arranged on the safety member. A communication port is penetrated through the cover plate, and the communication port and the explosion-proof valve are arranged at an interval along a second direction, and a communication channel is arranged between the communication port and the explosion-proof valve, wherein the first direction and the second direction are arranged at an included angle.

[0006] As a preferred scheme of the battery top cover assembly, a receiving groove is recessed on the side of the safety member facing the cover plate, the explosion-proof valve is arranged at the bottom of the receiving groove, and the cover plate plugs the opening of the receiving groove to form the communication channel.

[0007] As a preferred scheme of the battery top cover assembly, the battery top cover assembly further includes a sealing member. A liquid injection hole is opened at a position of the bottom of the receiving groove opposite to the communication port, and the sealing member is arranged on the safety member and seals the liquid injection hole.

[0008] As a preferred scheme of the battery top cover assembly, a spacing portion is protruded at the bottom of the receiving groove, the receiving groove is separated by the spacing portion to form a first groove and a second groove, the liquid injection hole is arranged at the bottom of the first groove, the explosion-proof valve is arranged at the bottom of the second groove, and at least part of the spacing portion is arranged at an interval from the cover plate.

[0009] As a preferred solution of the battery top cover assembly, a connecting groove is recessed on one side of the spacer adjacent to the cover plate, and the first groove communicates with the second groove through the connecting groove.

[0010] As a preferred solution of the battery top cover assembly, the battery top cover assembly further includes a sealing plate. A third groove is recessed at the bottom of the accommodating groove. The liquid injection hole is provided at the bottom of the third groove. The outer peripheral side wall of the sealing plate is welded and sealed with the groove wall of the third groove.

[0011] As a preferred solution of the battery top cover assembly, the opening of the third groove gradually increases from the bottom of the groove to the mouth of the groove; and / or, the sealing plate is a frustum block, and the diameter of the end face of the frustum block adjacent to the sealing member is smaller than the diameter of the end face of the frustum block away from the sealing member.

[0012] As a preferred solution of the battery top cover assembly, a fourth groove is recessed on one side of the cover plate facing the battery cell, and the safety member is inserted into the fourth groove.

[0013] As a preferred solution of the battery top cover assembly, the safety member has a central axis extending along the first direction. An extension portion is protruded around the central axis on the outer peripheral side wall of the safety member, and the extension portion is welded and sealed with the groove wall of the fourth groove.

[0014] As a preferred solution of the battery top cover assembly, a fifth groove is recessed on one side of the safety member away from the cover plate. An explosion-proof hole is penetrated through the bottom of the fifth groove. The explosion-proof valve is arranged in the fifth groove and blocks the explosion-proof hole; and / or, the distance between the explosion-proof valve and the cover plate is L1, and 0.5mm ≤ L1 ≤ 2.5mm.

[0015] As a preferred solution of the battery top cover assembly, the battery top cover assembly further includes a protective film, and the protective film is arranged on the cover plate and blocks the communication port.

[0016] In a second aspect, a battery is provided, which includes a housing, a battery cell, and the battery top cover assembly as described above. The housing is provided with a placement cavity for placing the battery cell and an opening communicating with the placement cavity, and the battery top cover assembly blocks the opening.

[0017] Advantages of the present utility model: By arranging the safety component provided with an explosion-proof valve on the inner side of the cover plate facing the battery cell along the first direction, and making the communication port on the cover plate communicating with the explosion-proof valve be spaced from the explosion-proof valve itself along the second direction, the side of the explosion-proof valve away from the battery cell along the first direction is protected by the cover plate, which can prevent the explosion-proof valve from being directly impacted externally, improve the protection performance of the explosion-proof valve, and thus effectively ensure the service life of the battery; when the internal pressure of the battery is too high and the explosion-proof valve bursts under normal conditions, the gas inside the battery can be sequentially discharged from the explosion-proof valve, the communication channel and the communication port, ensuring the use safety of the explosion-proof valve. Description of the Drawings

[0018] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0019] Figure 1 is a schematic structural diagram of the battery according to an embodiment of the present utility model;

[0020] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0021] Figure 3 is a schematic view of the cooperation between the safety component and the explosion-proof valve according to an embodiment of the present utility model;

[0022] Figure 4 is a schematic view of the cooperation between the cover plate and the safety component according to an embodiment of the present utility model;

[0023] Figure 5 is a schematic structural diagram of the safety component according to an embodiment of the present utility model.

[0024] In the figure:

[0025] 100, battery cell; 200, housing;

[0026] 1, cover plate; 11, communication port; 12, fourth groove; 2, safety component; 21, receiving groove; 211, first groove; 212, second groove; 22, explosion-proof hole; 23, liquid injection hole; 24, spacer; 25, third groove; 26, extension; 27, fifth groove; 3, explosion-proof valve; 4, seal; 5, sealing plate. Detailed Embodiments

[0027] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings rather than all the structures.

[0028] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0030] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] As Figure 1 and Figure 2 shown, the battery top cover assembly of the embodiment of the present utility model includes a cover plate 1, a safety member 2, and an explosion-proof valve 3. The safety member 2 is arranged on one side of the cover plate 1 facing the battery cell 100 along a first direction (the first direction is the X direction shown in the figure). An explosion-proof valve 3 is arranged on the safety member 2. A communication port 11 is penetrated through the cover plate 1. The communication port 11 and the explosion-proof valve 3 are arranged at an interval along a second direction (the second direction is the Y direction shown in the figure), and a communication channel is arranged between the communication port 11 and the explosion-proof valve 3. Among them, the first direction and the second direction are arranged at an included angle.

[0032] It can be understood that by arranging the safety component 2 provided with the explosion-proof valve 3 on the inner side of the cover plate 1 facing the battery cell 100 in the first direction, and setting the communication port 11 on the cover plate 1 communicating with the explosion-proof valve 3 at an interval from the explosion-proof valve 3 itself in the second direction, so that the side of the explosion-proof valve 3 away from the battery cell 100 in the first direction is protected by the cover plate 1, it can avoid the explosion-proof valve 3 being directly impacted externally, improve the protection performance of the explosion-proof valve 3, and thus effectively ensure the service life of the battery; when the internal pressure of the battery is too large and the explosion-proof valve 3 bursts under normal conditions, the gas inside the battery can be exported from the explosion-proof valve 3, the communication channel and the communication port 11 in sequence, ensuring the use safety of the explosion-proof valve 3.

[0033] Further, a receiving groove 21 is recessed on the side of the safety component 2 facing the cover plate 1, the explosion-proof valve 3 is arranged at the bottom of the receiving groove 21, and the cover plate 1 seals the opening of the receiving groove 21 to form a communication channel. Through the arrangement of the receiving groove 21, the communication port 11 can communicate with the explosion-proof valve 3. That is, an explosion-proof hole 22 is penetrated through the bottom of the receiving groove 21, and the explosion-proof valve 3 is arranged on the safety component 2 and seals the explosion-proof hole 22. Of course, in other embodiments, it may also be that a receiving groove 21 is recessed on the side of the cover plate 1 facing the safety component, and the safety component 2 seals the opening of the receiving groove 21 to form a communication channel.

[0034] Optionally, as Figure 3 and Figure 4 shown, the battery top cover assembly further includes a sealing member 4. A liquid injection hole 23 is opened at the position of the bottom of the receiving groove 21 opposite to the communication port 11. The sealing member 4 is arranged on the safety component 2 and seals the liquid injection hole 23. By arranging the liquid injection hole 23 on the safety component 2, the liquid injection of the battery can share the communication port 11 on the cover plate 1 with the explosion-proof valve 3, reduce the opening of the hole structure on the cover plate 1, improve the structural strength of the cover plate 1, and can reduce the production cost of the cover plate 1. The sealing member 4 is used to seal the liquid injection hole 23 to prevent the electrolyte from leaking from the liquid injection hole 23, and the sealing member 4 can be directly sealed with a sealant.

[0035] Preferably, a second sealing portion protrudes outward from the outer peripheral side wall of the sealing member 4 toward the side away from the center of the sealing member 4, and the second sealing portion is located at the end of the sealing member 4 away from the battery cell 100. The second sealing portion abuts against the bottom of the receiving groove 21, so that there is an additional sealing surface between the sealing member 4 and the safety component 2, further improving the sealing effect of the liquid injection hole 23.

[0036] Further, as Figure 3 and Figure 5As shown, a spacer portion 24 protrudes from the bottom of the receiving groove 21. The length of the spacer portion 24 extends in the third direction and is connected to two groove walls of the receiving groove 21 arranged in the third direction (the third direction is the Z direction shown in the figure). The first direction, the second direction, and the third direction are arranged at an angle to each other. In this embodiment, the first direction, the second direction, and the third direction are perpendicular to each other in pairs. The receiving groove 21 is separated by the spacer portion 24 to form a first groove 211 and a second groove 212. The liquid injection hole 23 is provided at the bottom of the first groove 211, and the explosion-proof hole 22 is provided at the bottom of the second groove 212. At least a part of the spacer portion 24 is spaced from the cover plate 1. By providing the spacer portion 24, the receiving groove 21 is spaced into the first groove 211 and the second groove 212. When injecting liquid into the battery through the liquid injection hole 23, if the electrolyte overflows from the liquid injection hole 23 or part of the electrolyte drips into the first groove 211 when the liquid injection head is pulled out, the electrolyte can be blocked by the spacer portion 24 and will not flow to the explosion-proof valve 3, avoiding the situation that the electrolyte contacts the explosion-proof valve 3 and causes corrosion and failure. By spacing the spacer portion 24 from the cover plate 1, the first groove 211 and the second groove 212 are communicated to ensure the connectivity between the explosion-proof hole 22 and the communication port 11.

[0037] In addition, in addition to directly spacing the spacer portion 24 from the cover plate 1, the spacer portion 24 can also be abutted against the cover plate 1 to ensure the support strength between the mounting member and the cover plate 1. By recessing a connection groove on the side of the spacer portion 24 adjacent to the cover plate 1, the first groove 211 is communicated with the second groove 212 through the connection groove.

[0038] Furthermore, as Figure 2 and Figure 3 shown, the battery top cover assembly further includes a sealing plate 5. A third groove 25 is recessed at the bottom of the receiving groove 21. The liquid injection hole 23 is provided at the bottom of the third groove 25. The outer peripheral side wall of the sealing plate 5 is welded and sealed with the groove wall of the third groove 25. The liquid injection hole 23 is sealed by the seal 4 for the first time, and then the sealing plate 5 is used for secondary welding and sealing, effectively improving the tightness of the liquid injection hole 23 and avoiding the leakage of the electrolyte. By providing the third groove 25, on the one hand, the position accuracy of the connection between the sealing plate 5 and the fixing member can be effectively improved, and through the restriction of the groove wall of the third groove 25 on the sealing plate 5, the installation stability of the sealing plate 5 can be improved, avoiding deviation during welding and affecting the welding quality of the sealing plate 5. On the other hand, by using the bottom of the third groove 25 to abut against the sealing plate 5, the situation that the sealing plate 5 squeezes the seal 4 and causes the seal 4 to fall into the battery can be avoided.

[0039] Optionally, the opening of the third groove 25 gradually increases from the groove bottom to the groove opening direction, that is, the groove wall of the third groove 25 is inclined. The groove wall of the third groove 25 can guide the sealing plate 5 and improve the installation convenience of the sealing plate 5. In addition, the sealing plate 5 can also be a frustum block, and the end face diameter of the frustum block adjacent to the sealing member 4 is smaller than the end face diameter of the frustum block away from the sealing member 4. That is, by using the outer periphery of the frustum block for guiding, the installation convenience of the frustum block can be improved. In other embodiments, the inclined groove wall of the third groove 25 fits with the outer peripheral side wall of the frustum block, improving the connection strength between the frustum block and the third groove 25.

[0040] In some embodiments, as Figure 2 and Figure 4 shown, the cover plate 1 is recessed on the side facing the battery cell 100 to form a fourth groove 12, and the safety member 2 is inserted into the fourth groove 12. By restricting the safety member 2 through the fourth groove 12, the installation accuracy of the safety member 2 can be enhanced, thereby improving the docking accuracy between the communication port 11 and the liquid injection hole 23.

[0041] Specifically, the safety member 2 has a central axis extending in the first direction. An extension portion 26 is protrudingly provided on the outer peripheral side wall of the safety member 2 around the central axis. The extension portion 26 is located at one end of the safety member 2 adjacent to the cover plate 1, and the extension portion 26 is welded and sealed with the groove wall of the fourth groove 12. Through the setting of the extension portion 26, the connection area between the safety member 2 and the cover plate 1 can be increased, ensuring the connection strength between the safety member 2 and the cover plate 1, and thus ensuring the sealing performance of the communication channel. And through the setting of the extension portion 26, it is convenient to perform welding with the cover plate 1 after ablation, improving the connection convenience between the safety member 2 and the cover plate 1.

[0042] Furthermore, as Figure 4 and Figure 5 shown, the safety member 2 is recessed on the side away from the cover plate 1 to form a fifth groove 27, and the explosion-proof hole 22 penetrates through the groove bottom of the fifth groove 27. The explosion-proof valve 3 is arranged in the fifth groove 27 and blocks the explosion-proof hole 22. Through the setting of the fifth groove 27, the installation accuracy of the explosion-proof valve 3 can be improved, thereby ensuring the matching accuracy between the explosion-proof valve 3 and the explosion-proof hole 22.

[0043] Optionally, the distance between the explosion-proof valve 3 and the cover plate 1 is L1, and 0.5 mm ≤ L1 ≤ 2.5 mm. For example, the distance L1 between the explosion-proof valve 3 and the cover plate 1 is 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, etc. If the L1 distance is too small, it is easy for the explosion-proof valve 3 to be blocked by the cover plate 1 and difficult to burst. If the L1 distance is too large, the safety member 2 occupies too much space, affecting the battery capacity. The distance between the explosion-proof valve 3 and the cover plate 1 is appropriate, which can not only ensure the normal bursting of the explosion-proof valve 3 but also effectively reduce the overall space occupied by the safety member 2 in the battery.

[0044] Even further, asFigure 2 and Figure 4 As shown in Figure 4 , the battery top cover assembly further includes a protective film, which is disposed on the cover plate 1 and seals the communication port 11. By providing the protective film, the protection of the communication port 11 is improved, thereby enhancing the use safety of the communication channel and the sealing plate 5 and the explosion-proof valve 3 in the communication channel.

[0045] As Figures 1 to 5 shown in Figures 1 to 5 , an embodiment of the present solution further provides a battery, including a housing 200, a battery cell 100, and the battery top cover assembly according to any one of the above embodiments. The housing 200 is provided with a placement cavity for placing the battery cell 100 and an opening communicating with the placement cavity. The battery top cover assembly seals the opening. A communication channel is formed by the cover plate 1 sealing the accommodation groove 21 on the safety member 2 inside the cover plate 1. Combining that the explosion-proof hole 22 on the safety member 2 and the communication port 11 of the cover plate 1 are spaced apart in the second direction, the explosion-proof valve 3 is protected by the cover plate 1 on the side away from the battery cell 100 in the first direction, which can prevent the explosion-proof valve 3 from being directly impacted externally, improve the protection of the explosion-proof valve 3, and thus effectively ensure the service life of the battery. Of course, the battery further includes a lower plastic, and the safety member 2 is disposed between the cover plate 1 and the lower plastic.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery top cover assembly, characterized in that: It includes a cover plate, a safety component and an explosion-proof valve, wherein the safety component is arranged on the side of the cover plate facing the battery core along a first direction, the explosion-proof valve is arranged on the safety component, a connecting port is penetrated through the cover plate, the connecting port and the explosion-proof valve are spaced apart along a second direction, and a connecting channel is arranged between the connecting port and the explosion-proof valve, wherein the first direction is arranged at an angle to the second direction.

2. The battery top cover assembly according to claim 1, characterized in that: The safety member is recessed toward one side of the cover plate to form a receiving groove, the explosion-proof valve is arranged at the bottom of the receiving groove, and the cover plate blocks the notch of the receiving groove to form the communicating channel.

3. The battery top cover assembly according to claim 2, characterized in that: It also includes a sealing member. A liquid injection hole is opened at the bottom of the containing groove relative to the connecting port. The sealing member is arranged on the safety member and seals the liquid injection hole.

4. The battery top cover assembly according to claim 3, characterized in that: The bottom of the accommodating groove is protrudingly provided with a spacer portion, and the accommodating groove is divided by the spacer portion to form a first groove and a second groove, the injection hole is arranged at the bottom of the first groove, and the explosion-proof valve is arranged at the bottom of the second groove, and at least part of the spacer portion is spaced apart from the cover plate.

5. The battery top cover assembly according to claim 4, characterized in that: A connecting groove is recessed on one side of the spacing portion adjacent to the cover plate, and the first groove is connected with the second groove through the connecting groove.

6. The battery top cover assembly according to claim 3, characterized in that: It also includes a sealing plate, the bottom of the accommodating groove is recessed to form a third groove, the injection hole is arranged at the bottom of the third groove, and the outer peripheral side wall of the sealing plate is welded and sealed to the groove wall of the third groove.

7. The battery top cover assembly according to claim 6, characterized in that: The opening of the third groove gradually increases from the groove bottom to the groove mouth; and / or the sealing plate is a truncated cone block, and the end face diameter of the truncated cone block adjacent to the sealing member is smaller than the end face diameter of the truncated cone block away from the sealing member.

8. The battery top cover assembly according to any one of claims 1 to 7, characterized in that: The cover plate is recessed on one side facing the battery core to form a fourth groove, and the safety member is inserted into the fourth groove.

9. The battery top cover assembly according to claim 8, characterized in that: The safety member has a central axis extending along the first direction, and an extension portion is protruding from an outer peripheral side wall of the safety member around the central axis, and the extension portion is welded and sealed to the groove wall of the fourth groove.

10. The battery top cover assembly according to any one of claims 1 to 7, characterized in that: A fifth groove is recessed on one side of the safety component away from the cover plate, an explosion-proof hole is penetrated through the bottom of the fifth groove, and the explosion-proof valve is arranged in the fifth groove and blocks the explosion-proof hole; and / or, the distance between the explosion-proof valve and the cover plate is L1, 0.5mm≤L1≤2.5mm.

11. The battery top cover assembly according to any one of claims 1 to 7, characterized in that: It also includes a protective film, which is arranged on the cover plate and blocks the communication port.

12. A battery, characterized in that: It comprises a shell, a battery cell and a battery top cover assembly as described in any one of claims 1 to 11, wherein the shell is provided with a placement cavity for placing the battery cell and an opening communicating with the placement cavity, and the battery top cover assembly blocks the opening.

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