Drainage device, battery pack shell and battery pack

Abstract

The utility model provides a drainage device, battery pack shell and battery pack, including the main part that is provided in the drainage hole of battery pack shell, the main part is internally provided with imbibition expansion body, the main part one end that faces the inside of battery pack shell is provided with the sealing part, the main part one end that is located outside the battery pack shell is provided with the plugging cover, and the sealing part is provided with the sealing part. An elastic piece is arranged between the plugging cover and the main body piece; under the action of the elastic force of the elastic piece, the plugging cover and the main body piece are kept in an abutting state, after the sealing part is broken and loses efficacy, the liquid absorption expansion body absorbs liquid, expands in the first direction and jacks up the plugging cover after overcoming the elastic force, and the interior and the exterior of the battery pack shell are communicated. According to the liquid discharging device disclosed by the utility model, the sealing part, the liquid absorption expansion body and the elastic piece are matched, so that the airtight reliability of the battery pack can be effectively ensured, and when the electrolyte leaks too much, the liquid absorption expansion body absorbs liquid to expand and overcomes the elastic force to jack up the plugging cover, so that the inside and the outside of the battery pack shell are communicated, and the electrolyte is smoothly discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a liquid discharge device. The utility model also relates to a battery pack housing provided with the liquid discharge device. The utility model also relates to a battery pack provided with the battery pack housing. Background Art

[0002] During the use of the battery pack, there is a possibility of electrolyte leakage in the battery cells. In order to discharge the leaked electrolyte out of the battery pack in time and ensure the safety of the battery pack, a drainage hole is usually provided on the battery pack shell. A sealable valve or diaphragm is usually provided in the drainage hole. The valve or diaphragm is usually in a closed state to prevent external environmental liquid from entering the battery pack. Moreover, the valve or diaphragm can be opened under specific working conditions to allow the liquid in the battery pack to be discharged outward.

[0003] In the prior art, the drain valve can solve the problem of electrolyte discharge when the battery cell leaks, but the leakage hole cannot accurately determine the leakage state of the battery pack, and the expansion body will slowly absorb the moisture in the battery pack, causing the diaphragm to open, thereby affecting the airtight reliability of the battery pack. Utility Model Content

[0004] In view of this, the utility model aims to provide a liquid discharge device to improve the airtight reliability of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A liquid discharge device, comprising a main body arranged in a liquid discharge hole of a battery pack shell, a liquid absorbing expansion body arranged in the main body, a sealing portion arranged at one end of the main body facing the inside of the battery pack shell, a blocking cover arranged at one end of the main body located outside the battery pack shell, and an elastic member arranged between the blocking cover and the main body;

[0007] Under the elastic force of the elastic member, the sealing cover and the main body are kept in a tight state. After the sealing part ruptures and fails, the liquid-absorbing and expandable body absorbs liquid and expands along the first direction, and after overcoming the elastic force, the sealing cover is lifted up, and the interior of the battery pack shell is connected with the outside.

[0008] Furthermore, an end cover is provided at one end of the main body facing the interior of the battery pack shell, and the end cover is provided with a through hole for liquid to flow through; the sealing part includes a waterproof and breathable membrane that seals the through hole.

[0009] Furthermore, the through holes are multiple and are arranged at intervals on the end cover, and the waterproof and breathable membrane is provided at each of the through holes.

[0010] Furthermore, the main body has a containing cavity, the liquid-absorbing expansion body is placed in the containing cavity, and the end cover seals the open portion of the containing cavity.

[0011] Furthermore, the liquid-absorbing swelling body is made of water-absorbing resin or water-absorbing rubber.

[0012] Furthermore, a first sealing member is provided between the blocking cover and the main body, and the first sealing member is used to seal the gap between the blocking cover and the main body.

[0013] Furthermore, the main body is provided with a connecting portion connected to the battery pack shell; a second sealing member is provided between the main body and the battery pack shell, and the second sealing member is used to seal the gap between the main body and the battery pack shell.

[0014] Furthermore, the main body is provided with a connecting frame with a guide hole; the blocking cover is provided with a guide column, the guide column is inserted into the guide hole, the elastic member is sleeved on the guide column, and the elastic member is limited between the guide column and the connecting frame.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The liquid discharge device described in the utility model, through the provided sealing portion, the liquid absorbing expansion body provided in the main body, and the elastic member provided between the sealing cover and the main body, can absorb liquid through the liquid absorbing expansion body after the sealing portion ruptures and fails, and with the provision of the elastic member, the sealing cover and the main body can be kept in a tight state. When the electrolyte leakage does not reach the set value, the sealing portion can effectively prevent moisture in the battery pack shell from contacting the liquid absorbing expansion body, thereby ensuring the airtight reliability of the battery pack.

[0017] Moreover, when the electrolyte leakage is too much, the liquid-absorbing expansion body expands along the first direction after absorbing the liquid, and after overcoming the elastic force, it lifts up the sealing cover, connecting the inside of the battery pack shell with the outside, so that the electrolyte can be smoothly discharged from the outside of the battery pack shell.

[0018] In addition, the end cap is convenient for the installation of the internal liquid-absorbing expansion body on the one hand, and the waterproof breathable membrane on the other hand. Moreover, the through hole provided on the end cap and the waterproof breathable membrane provided at the through hole have the characteristics of simple structure and convenient design and implementation. There are multiple through holes, and each through hole is provided with a waterproof breathable membrane. In this way, after the waterproof breathable membrane in a through hole fails, the waterproof breathable membranes in other through holes still have sealing properties, which is conducive to further improving the air tightness of the battery pack.

[0019] In addition, the provision of the first sealing member can help ensure the sealing of the connection between the plugging cover and the main body. The connection portion provided on the main body can ensure the reliability of the connection between the main body and the battery pack shell. The second sealing member between the main body and the battery pack shell is conducive to ensuring the sealing between the main body and the battery pack shell. The provision of a connecting frame with a guide hole and a guide column can facilitate the fixed installation of the elastic member, and the structure is simple and easy to process and manufacture.

[0020] Another object of the present invention is to provide a battery pack housing, on which the above-mentioned liquid discharge device is provided.

[0021] Another object of the present invention is to provide a battery pack, in which the above-mentioned battery pack housing is provided.

[0022] The battery pack housing and the battery pack of the present invention, as well as the liquid discharge device described above, have the same beneficial effects as those of the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of the liquid discharge device according to an embodiment of the utility model;

[0025] Figure 2 An exploded view of the liquid discharge device according to an embodiment of the utility model;

[0026] Figure 3 A schematic structural diagram of the liquid discharge device according to an embodiment of the utility model from another perspective;

[0027] Figure 4 This is a cross-sectional view taken along the AA direction according to an embodiment of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the matching state of the guide column and the elastic member according to the embodiment of the utility model;

[0029] Figure 6 A partial structural diagram of a battery pack housing according to an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] 1. Main body; 2. End cover; 3. Waterproof breathable membrane; 4. Liquid-absorbing expansion body; 5. Blocking cover; 6. Elastic member; 7. First sealing member; 8. Second sealing member;

[0032] 11. Connecting frame; 12. Guide hole; 14. Connecting portion; 21. Through hole; 51. Guide column; 52. Limiting block; 10. Draining device; 100. Battery pack housing. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] The present embodiment relates to a liquid discharge device, which is helpful in improving the airtight reliability of a battery pack.

[0038] In terms of overall composition, Figures 1 to 4 As shown, the liquid discharge device 10 of this embodiment includes a main body 1. The main body 1 is arranged in the liquid discharge hole of the battery pack shell 100, and a liquid absorption expansion body 4 is arranged in the main body 1, a sealing portion is arranged at one end of the main body 1 facing the inside of the battery pack shell 100, a blocking cover 5 is arranged at one end of the main body 1 located outside the battery pack shell 100, and an elastic member 6 is arranged between the blocking cover 5 and the main body 1.

[0039] Under the elastic force of the elastic member 6, the sealing cover 5 and the main body 1 remain in a tight state. After the sealing part ruptures and fails, the liquid-absorbing expansion body 4 absorbs liquid and expands along the first direction, and after overcoming the elastic force, it lifts up the sealing cover 5, and the interior of the battery pack shell 100 is connected with the outside.

[0040] At this time, the sealing part can play the role of the first layer of sealing. After the sealing part ruptures and fails, the liquid-absorbing expansion body 4 is arranged to absorb liquid, and the liquid-absorbing expansion body 4 plays the role of the second layer of sealing. At the same time, with the arrangement of the elastic part 6, the sealing cover 5 and the main body 1 can be kept in a tight state. When the electrolyte leakage does not reach the set value, the sealing part can effectively prevent moisture in the battery pack shell 100 from contacting the liquid-absorbing expansion body 4, thereby improving the airtight reliability of the battery pack.

[0041] Moreover, when the electrolyte leakage is too much, the liquid-absorbing expansion body 4 expands along the first direction after absorbing the liquid, and after overcoming the elastic force, lifts up the sealing cover 5, and the inside of the battery pack shell 100 is connected with the outside, so that the electrolyte can be smoothly discharged from the outside of the battery pack shell 100.

[0042] It is worth noting that the first direction mentioned above specifically refers to Figure 1 and Figure 2 The direction indicated by the arrow in the figure. The liquid-absorbing expansion body 4 is usually made of a compressible material in the prior art, and can also be made of a water-absorbing resin or a water-absorbing rubber, etc. After absorbing water, it can expand to several times of its own mass or volume, and use its expansion force to overcome the elastic force and push the blocking cover 5, so that the inside and outside of the battery pack housing 100 are connected to form a leakage channel. In addition, it is worth noting that the elastic member 6 of this embodiment is preferably a spring.

[0043] As a preferred implementation, in this embodiment, the main body 1 has a receiving cavity, in which the liquid-absorbing expansion body 4 is accommodated, and an end cover 2 is provided at one end of the main body 1 facing the inside of the battery pack shell 100, and the end cover 2 is blocked to the open part of the receiving cavity, so as to fix the liquid-absorbing expansion body 4 in the receiving cavity. Moreover, the end cover 2 of this embodiment is provided with a through hole 21 for liquid to flow through. The above-mentioned sealing part includes a waterproof breathable membrane 3 blocked at the through hole 21. The end cover 2 is provided, on the one hand, to facilitate the installation of the internal liquid-absorbing expansion body 4, and on the other hand, it is also convenient for the installation of the waterproof breathable membrane 3. Moreover, the through hole 21 provided on the end cover 2 and the waterproof breathable membrane 3 provided at the through hole 21 have the characteristics of simple structure and easy design and implementation.

[0044] In specific implementation, a waterproof breathable membrane 3 is pre-fixed in the through hole 21 on the end cover 2. The cavity formed inside the main body 1 is used to fill the liquid-absorbing expansion body 4. After the liquid-absorbing expansion body 4 is loaded, the end cover 2 is fixed to the main body 1 by screwing or welding.

[0045] It should be noted that waterproof and breathable membranes 3 with different bearing pressures can be selected according to actual needs to achieve the setting of the leakage opening value. The bearing pressure of the waterproof and breathable membrane 3 is also the set leakage opening value. When it is greater than the set pressure of the waterproof and breathable membrane 3, the waterproof and breathable membrane 3 is damaged, and the electrolyte contacts the liquid-absorbing expansion body 4 and is absorbed by the liquid-absorbing expansion body 4. After the expansion force of the liquid-absorbing expansion body 4 overcomes the elastic force of the elastic member 6, the blocking cover 5 will be opened, so that the inside and outside of the battery pack are connected.

[0046] Continue to view Figures 1 to 4 As shown, in this embodiment, a plurality of through holes 21 are arranged at intervals on the end cover 2, and a waterproof breathable membrane 3 is provided at each through hole 21. By providing a waterproof breathable membrane 3 in each through hole 21, after the waterproof breathable membrane 3 in a through hole 21 fails, the waterproof breathable membrane 3 in other through holes 21 still has sealing performance, which is conducive to further improving the air tightness of the battery pack.

[0047] In this embodiment, in order to ensure the sealing performance of the connection between the blocking cover 5 and the main body 1, as shown in FIG. Figure 4 As shown, a first sealing member 7 is provided between the blocking cover 5 and the main body 1, and the first sealing member 7 is used to seal the gap between the blocking cover 5 and the main body 1. The first sealing member 7 is preferably a sealing ring. In specific implementation, a mounting groove can be provided on the blocking cover 5 or on the end surface of the main body 1 for mounting the sealing ring, so that the sealing ring can be easily fixed.

[0048] Moreover, in the present embodiment, a connection portion 14 connected to the battery pack shell 100 is provided on the main body 1; and a second seal 8 is provided between the main body 1 and the battery pack shell 100, and the second seal 8 is used to seal the gap between the main body 1 and the battery pack shell 100. The provision of the second seal 8 can ensure the sealing of the connection between the main body 1 and the battery pack shell 100. In addition, the second seal 8 is also preferably a sealing ring. Similarly, in order to facilitate the fixation of the second seal 8, an installation groove for installing the sealing ring can be provided on the main body 1. Of course, it can be understood that the installation groove can also be provided on the outer wall of the battery pack shell 100.

[0049] See also Figures 1 to 5 As shown, the connection portion 14 specifically includes a plurality of connection holes arranged at intervals in the circumferential direction of the main body 1, and is threadedly connected to the battery pack housing 100 through threaded connectors passing through the connection holes. This connection method has a simple structure and can ensure the reliability of the connection.

[0050] In order to facilitate the fixing of the elastic member 6, in this embodiment, as a preferred embodiment, Figure 4 and Figure 5As shown, a connecting frame 11 having a guide hole 12 is provided on the main body 1. The connecting frame 11 is formed at the end of the main body 1 and is specifically composed of a plurality of connecting arms connected together. The guide hole 12 is formed in the middle of the connecting frame 11. In addition, a guide column 51 is provided on the blocking cover 5. The guide column 51 is inserted into the guide hole 12. The elastic member 6 is specifically sleeved on the guide column 51, and the elastic member 6 is limited between the guide column 51 and the connecting frame 11.

[0051] In specific implementation, a stopper 52 is provided at one end of the guide column 51 close to the end cover 2, and the stopper 52 can be snapped or screwed to the end of the guide column 51. Moreover, the outer contour of the stopper 52 is larger than the diameter of the guide column 51, so that after the elastic member 6 is sleeved on the guide column 51, the elastic member 6 is compressed and limited between the guide column 51 and the connecting frame 11 by the stopper 52.

[0052] The discharge device 10 of this embodiment can effectively ensure the airtight reliability of the battery pack through the cooperation of the sealing part, the liquid absorption expansion body 4 and the elastic member 6. When the electrolyte leakage is too much, the liquid absorption expansion body 4 absorbs liquid and expands to overcome the elastic force, and then lifts up the sealing cover 5, connecting the inside and outside of the battery pack shell 100, so that the electrolyte can be discharged smoothly.

[0053] This embodiment also relates to a battery pack housing 100, such as Figure 6 As shown, the battery pack housing 100 is provided with a drainage hole, and the drainage device 10 is arranged in the drainage hole. Specifically, the connection part 14 on the main body 1 is screwed to the battery pack housing 100, and the second sealing member 8 is used to ensure the sealing reliability of the connection between the main body 1 and the battery pack housing 100.

[0054] In addition, the present embodiment also relates to a battery pack, in which the battery pack housing 100 as described above is provided.

[0055] The battery pack housing 100 and the battery pack of this embodiment have the same technical effects as the above-mentioned discharge device 10 .

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid discharge device, characterized in that: A main body is provided in the liquid discharge hole of the battery pack shell, a liquid absorbing expansion body is provided in the main body, a sealing portion is provided at one end of the main body facing the inside of the battery pack shell, a blocking cover is provided at one end of the main body located outside the battery pack shell, and an elastic member is provided between the blocking cover and the main body; Under the elastic force of the elastic member, the sealing cover and the main body are kept in a tight state. After the sealing part ruptures and fails, the liquid-absorbing and expandable body absorbs liquid and expands along the first direction, and after overcoming the elastic force, the sealing cover is lifted up, and the interior of the battery pack shell is connected with the outside.

2. The liquid discharge device according to claim 1, characterized in that: An end cover is provided at one end of the main body facing the interior of the battery pack shell, and a through hole is provided on the end cover for liquid to flow through; The sealing portion includes a waterproof and breathable membrane that seals the through hole.

3. The liquid discharge device according to claim 2, characterized in that: The through holes are multiple and are arranged at intervals on the end cover, and the waterproof and breathable membrane is provided at each of the through holes.

4. The liquid discharge device according to claim 2, characterized in that: The main body has a containing cavity, the liquid-absorbing expansion body is contained in the containing cavity, and the end cover seals the open portion of the containing cavity.

5. The liquid discharge device according to claim 1, characterized in that: The liquid-absorbing expansion body is made of water-absorbing resin or water-absorbing rubber.

6. The liquid discharge device according to claim 1, characterized in that: A first sealing member is provided between the blocking cover and the main body, and the first sealing member is used to seal the gap between the blocking cover and the main body.

7. The liquid discharge device according to claim 1, characterized in that: The main body is provided with a connecting portion connected to the battery pack shell; A second sealing member is provided between the main body and the battery pack shell, and the second sealing member is used to seal the gap between the main body and the battery pack shell.

8. The liquid discharge device according to any one of claims 1 to 7, characterized in that: The main body is provided with a connecting frame having a guide hole; The blocking cover is provided with a guide post, the guide post is inserted into the guide hole, the elastic member is sleeved on the guide post, and the elastic member is limited between the guide post and the connecting frame.

9. A battery pack housing, characterized in that: The battery pack housing is provided with a liquid discharge device according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery pack housing as claimed in claim 9.

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