Power battery pack sealing box

Abstract

The utility model discloses a power battery pack sealing box which comprises a box body, a box cover and a connecting piece, a containing cavity is formed in the box body, the connecting piece comprises a first component and a second component, the first component is connected with the box body, and the second component is connected with the first component and connects the box cover to the box body; the first component comprises a first end inserted into the containing cavity, the side, away from the containing cavity, of the first end is connected with the second component, and the side, close to the containing cavity, of the first end is closed to isolate the containing cavity from the second component. According to the power battery pack sealing box provided by the utility model, the box cover and the box body are fixedly connected through the connecting piece, and the position of the connecting piece is sealed through the sealing structure of the connecting piece, so that the problem of sealing failure of the sealing box at the position of the connecting piece is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a sealed box for a power battery pack. Background Art

[0002] A power battery pack generally refers to a battery system for storing electric energy in an electric vehicle, which is one of the core components of the electric vehicle. The sealed box of the power battery pack is a very important component in the power battery pack of new energy vehicles. It not only carries the battery module, but also plays a key role in the safe operation and protection of the battery module. The design requirements of the sealed box of the power battery pack include meeting the requirements of strength and stiffness, the design requirement of the protection grade IP67 of the electrical equipment shell, and providing collision protection, etc. In the existing design of the sealed box of the power battery pack, most of the focus is on the lightweight design of the sealed box, but in fact, the sealing effect of the sealed box itself is also particularly important.

[0003] The sealed box of the power battery pack needs to always maintain a sealed state during the use of the power battery pack. Firstly, in order to ensure the protection grade of the power battery pack, the sealed box of the battery pack usually needs to meet certain protection grade standards, such as IP67 grade, which means that the box body can resist short-term immersion and the intrusion of dust. The high protection grade helps to improve the reliability of the battery pack in harsh environments. Secondly, in order to achieve the waterproof and dustproof of the power battery pack, the sealing of the sealed box of the battery pack can prevent moisture and dust from entering the battery interior, avoiding damage to the battery performance and life. The electrical components of the battery are very sensitive to moisture and dust. Once they are affected by moisture or dust accumulation, it may lead to short circuits or other failures. Thirdly, to ensure the chemical stability of the power battery pack, the sealing of the battery pack box body can prevent the intrusion of chemically corrosive substances, protect the battery from corrosion, and extend the service life of the battery. Fourthly, to ensure the electromagnetic compatibility of the power battery pack, the sealing of the battery pack box body also helps to reduce electromagnetic interference and ensure the normal operation of the battery management system (BMS) and other electronic devices.

[0004] However, in the prior art, the sealing of the sealed box of the power battery pack mainly relies on structures such as sealing rings. If problems such as aging, deformation, and damage occur to the sealing rings, etc., the sealing ability of the sealed box of the power battery pack will be lost, affecting the normal operation and continued use of the power battery pack. Summary of the Utility Model

[0005] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides a sealed box for a power battery pack. A connecting piece realizes the fixed connection between the box cover and the box body, and the sealing of the position of the connecting piece is realized through the sealing structure of the connecting piece itself, avoiding the problem of sealing failure at the position of the connecting piece of the sealed box.

[0006] The technical solution adopted by the utility model to solve its problems is:

[0007] A power battery pack sealed box, comprising a box body, a box cover and a connector, wherein the box body has a containing cavity;

[0008] The connecting member includes a first component and a second component, the first component is connected to the box body, and the second component is connected to the first component and connects the box cover to the box body;

[0009] The first component includes a first end inserted into the accommodating cavity, a side of the first end facing away from the accommodating cavity is connected to the second component, and a side of the first end close to the accommodating cavity is closed to isolate the accommodating cavity and the second component.

[0010] Furthermore, the first component is fixedly connected to the box body and sealed.

[0011] Furthermore, the first end extends into the accommodating cavity, the first component further includes a second end facing away from the accommodating cavity, and the second component extends from the second end toward the first end and is detachably connected to the first component.

[0012] Further, the first component includes a supporting portion, a mounting portion and an extending portion connected in sequence, the extending portion and the supporting portion are respectively arranged close to the first end and the second end, the box cover is placed on the supporting portion and is locked on the supporting portion by the second component, the mounting portion is fixedly connected to the box body and sealed, the extending portion extends into the accommodating cavity, and the extending portion is provided with the first end away from the mounting portion.

[0013] Furthermore, a connecting portion is provided on the inner wall of the extending portion, and the second member passes through the supporting portion and the mounting portion from the second end and is detachably fixed to the connecting portion.

[0014] Further, the first member and the second member are threadedly connected;

[0015] A connecting hole is provided in the extending portion, and a connecting internal thread is provided in the connecting hole. The connecting portion includes the internal thread. The second component is a connecting bolt, and the connecting bolt is threadedly connected to the connecting hole.

[0016] Furthermore, the connecting hole is a blind hole, and the front end of the connecting bolt does not contact the inner bottom surface of the blind hole.

[0017] Furthermore, the connecting bolt includes a head and a rod body connected in one piece, and a clamping shoulder and an avoidance groove are provided on the side of the head facing the box cover, the clamping shoulder is provided close to the rod body and is clamped on the box cover; the avoidance groove is a groove facing away from the box cover.

[0018] Further, it further includes a sealing ring, and the sealing ring is disposed between the supporting portion and the box cover.

[0019] Further, the box cover is hermetically connected to the box body.

[0020] In summary, a power battery pack sealing box provided by the present utility model has the following technical effects:

[0021] 1. By sealing the first end of the connecting member, the accommodation cavity and the second member are isolated, so that the power battery pack sealing box will not leak from the first end of the first member of the connecting member, improving the sealing effect and sealing ability of the power battery pack sealing box.

[0022] 2. By sealing the first end of the connecting member, the accommodation cavity and the second member are isolated, weakening the role of the sealing ring when the first member and the second member of the connecting member are connected. When using the connecting member of the present application, even if problems such as aging, deformation or damage occur to the sealing ring at the positions of the first member and the second member, it will not affect the sealing of the sealing box at the position of the connecting member. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an embodiment of a power battery pack sealing box of the present utility model.

[0024] Figure 2 is Figure 1 a cross-sectional view of.

[0025] Figure 3 It is a schematic structural diagram of the first member.

[0026] Among them, the meanings of the reference numerals are as follows:

[0027] 1. Box body; 11. Accommodation cavity; 2. Box cover; 3. Connecting member; 31. First member; 32. Second member; 31a. First end; 31b. Second end; 311. Supporting portion; 312. Installation portion; 313. Extension portion; 314. Connection portion; 321. Pressing shoulder; 322. Avoidance groove; 4. Sealing ring. Detailed Embodiments

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 to the present utility model.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0031] The power battery pack sealing box mainly includes a box body and a box cover. The box cover is installed on the box body through a connecting member and seals the box body. In the prior art, generally, a sealing ring or a gasket is provided between the box cover and the box body to achieve the sealing of the box body and the box cover. During the long-term use of the power battery pack sealing box, the battery pack and other components inside the power battery pack sealing box generate heat, which will cause problems such as aging, deformation, and wear of the sealing ring used for sealing, resulting in a reduction in the sealing effect of the sealing ring and even the loss of the sealing effect, affecting the normal operation of the power battery pack and even causing safety accidents. Especially the sealing ring at the connection position of the box cover and the box body through the connecting member, or the position of the sealing ring close to the connection of the box cover and the box body, due to the locking force of the connecting member, the pressure of the box cover on the sealing ring at this position or the nearby position increases, the sealing ring deforms more, and the sealing ring is more likely to age and deform, seriously shortening the service life of the power battery pack and the power battery pack sealing box, increasing the failure rate of the power battery pack, and increasing the vehicle use cost. To solve this problem, a connecting member for the power battery pack sealing box is proposed below. This connecting member can seal itself, weakening the role of the sealing ring at the connection position of the box cover and the box body, and solving the problem that the sealing ring at the connecting member position is prone to deformation and aging, resulting in the sealing failure of the power battery pack sealing box.

[0032] For the convenience of those skilled in the art to understand the above-mentioned connecting member, the structure and function of the connecting member will be introduced in detail below in combination with the structure of the power battery pack sealing box.

[0033] Refer to Figure 1 、 Figure 2 As shown, a power battery pack sealing box structure of the present utility model is disclosed. As Figure 3 shown, the structure of the first component of the connecting member is disclosed.

[0034] A power battery pack sealing box includes a box body 1, a box cover 2, and a connecting member 3. The box body 1 has a receiving cavity 11.

[0035] The connecting member 3 includes a first member 31 and a second member 32. The first member 31 is connected to the box body 1, and the second member 32 is connected to the first member 31 and connects the box cover 2 to the box body 1.

[0036] The first member 31 includes a first end 31a inserted into the accommodating cavity 11. One side of the first end 31a facing away from the accommodating cavity 11 is connected to the second member 32, and one side of the first end 31a close to the accommodating cavity 11 is closed to isolate the accommodating cavity 11 and the second member 32.

[0037] Based on the above technical solution, the first member 31 is connected to the box body 1, the second member 32 is connected to the first member 31, and at the same time, the box cover 2 is connected to the box body 1, realizing the connection between the box cover 2 and the box body 1. The first end 31a of the first member 31 is sealed, and the sealed first end 31a isolates the accommodating cavity 11 and the second member 32, so that the accommodating cavity 11 will not leak from the position of the first end 31a of the first member 31.

[0038] Based on the above technical solution, the first end 31a of the first member 31 is sealed, and the sealed first end 31a isolates the accommodating cavity 11 and the second member 32, so that the connection position between the first member 31 and the second member 32 no longer depends on the sealing ring for sealing the box cover and the box body. The sealing ring can be cancelled at the connection position between the first member and the second member, reducing the cost. Especially during the later working process of the battery pack, the deformation and aging of the sealing ring at this connection position, which may cause sealing failure, are greatly reduced or even eliminated, prolonging the service life of the battery pack and reducing the use cost of the battery pack.

[0039] The "sealing ring" mentioned in the above paragraph refers to Figure 2 the sealing ring marked as 4. The sealing ring 4 can achieve the sealing between the first member 31 and the box cover 2. When one side of the first end 31a of the first member close to the accommodating cavity 11 is closed to isolate the accommodating cavity 11 and the second member 32, the sealing effect of this sealing ring 4 is weakened, and even the sealing ring 4 may not be needed for sealing.

[0040] It should be noted here that, such as Figure 1 and Figure 2The figure mainly shows a schematic diagram of the position of the connecting member 3. For the box body 1 and the accommodating cavity 11, only the structure at the position of the connecting member 3 is shown, and the structures of the remaining parts of the box body 1, the accommodating cavity 11 and the box cover 2 are not shown. The box cover 3 seals the remaining parts of the box body 1 and the accommodating cavity 11. In this solution, the key point is to introduce the structure and function of the connecting member 3, so the box cover 3 for the remaining parts of the box body 1 and the accommodating cavity 11 will not be introduced and is also omitted in the view. However, it should be emphasized that the box cover 2 is sealed and detachably fixedly installed on the box body 1 and seals the accommodating cavity 11 inside the box body 1. Generally, the accommodating cavity 11 is used for fixedly installing batteries.

[0041] In this technical solution, in order to further ensure the sealing between the position of the connecting member and the box body, the first member 31 is fixedly connected to and sealed with the box body 1.

[0042] The connection position between the first member 31 itself and the box body 1 also needs to be sealed. Generally, the sealing method is to fixedly connect and seal the first member 31 to the box body 1 by means of high-strength welding or the like. Generally, the box bodies of power battery packs are mostly made of materials including aluminum, steel, carbon fiber composite materials, SMC (sheet molding compound), PCM (polycarbonate alloy), CFRP (carbon fiber reinforced plastic), etc. In the welding and fixing of the first member 31 and the box body 1, the welding process is strictly controlled to ensure that after the first member and the box body are fixedly connected, the fixed connection position meets the sealing requirements, and after sealing, airtightness detection is required to ensure the sealed fixation of the first member 31 and the box body 1.

[0043] In this technical solution, as Figure 2 and Figure 3 shown, the first end 31a extends into the accommodating cavity 11. The first member 31 further includes a second end 31b facing away from the accommodating cavity 11. The second member 32 extends from the second end 31b to the first end 31a and is detachably connected to the first member 31. The first end 31a extending into the accommodating cavity 11 provides sufficient space for the connection between the second member 32 and the first member 31, ensures the strength of the connection between the first member and the second member, and ensures the stable sealed installation of the box cover on the box body.

[0044] In this technical solution, as Figure 3 shown, the first member 31 includes a support portion 311, a mounting portion 312, and an extension portion 313 connected in sequence. The extension portion 313 and the support portion 311 are respectively arranged close to the first end 31a and the second end 31b. The box cover 2 is placed on the support portion 311 and is locked on the support portion 311 by the second member 32. The mounting portion 312 is fixedly connected to and sealed with the box body 1. The extension portion 313 extends into the accommodating cavity, and the first end 31a as described above is provided at a position where the extension portion 313 is far from the mounting portion 312.

[0045] Based on the above technical solution, the first component is fixedly installed and sealed with the box body by fixing the installation part to the box body. The support part provides a position for the connection of the box cover, and the extension part realizes the connection with the second component, enabling the reliable connection between the second component and the first component. At the same time, it ensures the sealed installation of the box cover and the box body through the connecting piece.

[0046] In this technical solution, a connecting part 314 is provided on the inner wall of the extension part 313. The second component 32 passes through the support part 311 and the installation part 312 from the second end 31b and is detachably fixed to the connecting part 314. The connecting part 314 is provided inside the extension part 313, providing a connection position for the connection between the second component and the first component, with simple connection, without damaging the seal of the first end of the first component, and without adding more connection positions between the first component and the box body, ensuring the sealed connection between the first component and the box body and ensuring the isolation between the second component and the accommodation cavity 11.

[0047] The above-mentioned connecting part 314 can generally be a threaded connection structure, a snap connection structure, or other connection structures to achieve the rapid connection between the first component and the second component.

[0048] In this technical solution, the first component 31 and the second component 32 are threadedly connected, which is convenient and fast, and the structures of the first component and the second component are simple.

[0049] Of course, the first component and the second component can also be connected in other ways, such as snap connection or buckle connection, that is, the second component is fixedly connected to the first component through a snap or a structure adapted to the first component. For example, a groove is provided on the inner wall of the connecting part 314, and a protrusion controlled by an elastic member such as a spring is provided on the outer wall of the second component, and the protrusion can squeeze the elastic member. When the second component is connected to the first component, the protrusion squeezes the elastic member so that the protrusion smoothly enters the groove to achieve the connection between the first component and the second component.

[0050] In this technical solution, a connection hole is provided inside the extension part 313, and an internal thread is provided in the connection hole. The connecting part 314 includes the aforementioned internal thread. The second component 32 is a connecting bolt, and the connecting bolt is connected to the connection hole through the aforementioned internal thread. The provision of a connection hole with an internal thread inside the extension part 313 facilitates the threaded connection between the first component and the extension part, with simple and fast connection operation, low cost, and capable of multiple loading and unloading operations.

[0051] In this solution, the connection hole is a blind hole, and the front end of the connecting bolt does not contact the inner bottom surface of the blind hole, ensuring the complete connection between the connecting bolt and the connection hole, while also avoiding damage to the first end by the connecting bolt and ensuring the seal of the first end.

[0052] In this solution, the connecting bolt includes a head and a shank that are integrally connected. On the side of the head facing the lid 2, a pressing shoulder 321 and an avoidance groove 322 are provided. The pressing shoulder 321 is arranged close to the shank and presses against the lid 2. The avoidance groove 322 is a groove facing away from the lid 2. By providing the pressing shoulder 321 on the connecting bolt and arranging the pressing shoulder 321 close to the shank, when the connecting bolt connects the lid to the box body 1, the edge of the lid at the position where the connecting bolt passes through can be pressed down and tightened, avoiding deformation of the lid at the position where the connecting bolt passes through due to the pressing force of the connecting bolt, that is, avoiding deformation of the hole on the lid through which the connecting bolt passes, and ensuring that the lid can be disassembled and assembled multiple times.

[0053] In this solution, on the side of the connecting bolt facing the lid 2, a groove facing away from the lid (avoidance groove 322) is provided. On the one hand, it can be used to avoid some structures on the lid, and on the other hand, it can prevent the contact area between the head of the connecting bolt and the lid from being too large, resulting in too large a force-bearing surface on the lid, making it difficult to press the lid tightly and seal it with the box body.

[0054] In this technical solution, a power battery pack sealing box further includes a sealing ring 4, and the sealing ring 4 is placed between the supporting portion 311 and the lid 2. By providing the sealing ring 4 here, the friction and vibration between the first member and the second member and between the first member and the lid 2 are reduced.

[0055] In this technical solution, the lid 2 is hermetically connected to the box body 1. As Figure 2 shown, only the lid and box body structure at the position of the connecting member 3 are shown. On the power battery pack sealing box, the lid and the box body are hermetically connected as a whole.

[0056] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A sealed box for a power battery pack, characterized in that: It comprises a box body, a box cover and a connecting piece, wherein the box body has a containing cavity; The connecting member includes a first component and a second component, the first component is connected to the box body, and the second component is connected to the first component and connects the box cover to the box body; The first component includes a first end inserted into the accommodating cavity, a side of the first end facing away from the accommodating cavity is connected to the second component, and a side of the first end close to the accommodating cavity is closed to isolate the accommodating cavity and the second component.

2. The sealed box of a power battery pack according to claim 1, characterized in that, The first component is fixedly connected to the box body and sealed.

3. A sealed box for a power battery pack according to claim 1 or 2, characterized in that The first end extends into the accommodating cavity, the first component further includes a second end away from the accommodating cavity, the second component extends from the second end toward the first end, and is detachably connected to the first component.

4. The sealed box of a power battery pack according to claim 3, wherein The first component includes a supporting portion, a mounting portion and an extending portion connected in sequence, the extending portion and the supporting portion are respectively arranged close to the first end and the second end, the box cover is placed on the supporting portion and is locked on the supporting portion by the second component, the mounting portion is fixedly connected to the box body and sealed, the extending portion extends into the accommodating cavity, and the extending portion is provided with the first end away from the mounting portion.

5. A sealed box for a power battery pack according to claim 4, characterized in that, The inner wall of the extending portion is provided with a connecting portion, and the second member passes through the supporting portion and the mounting portion from the second end and is detachably fixed to the connecting portion.

6. The sealed box of a power battery pack according to claim 5, wherein The first member and the second member are threadedly connected; A connecting hole is provided in the extending portion, and a connecting internal thread is provided in the connecting hole. The connecting portion includes the internal thread. The second component is a connecting bolt, and the connecting bolt is threadedly connected to the connecting hole.

7. The sealed box of a power battery pack according to claim 6, characterized in that The connecting hole is a blind hole, and the front end of the connecting bolt does not contact the inner bottom surface of the blind hole.

8. The sealed box of a power battery pack according to claim 6, characterized in that, The connecting bolt includes a head and a rod body connected in one piece, a pressing shoulder and an avoidance groove are arranged on the side of the head facing the box cover, the pressing shoulder is arranged close to the rod body and pressed on the box cover; the avoidance groove is a groove facing away from the box cover.

9. The sealed box of a power battery pack according to claim 4, characterized in that, It also includes a sealing ring, which is placed between the supporting part and the box cover.

10. A sealed box for a power battery pack according to claim 1, characterized in that, The box cover is sealed and connected to the box body.

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