Battery box body and battery pack

Abstract

The utility model discloses a battery box body and a battery pack. The battery box body comprises a cover plate and a battery box body, the box body is arranged on one side, in the thickness direction, of the cover plate, a mounting groove and a groove are formed in the side, facing the cover plate, of the box body, the groove and the mounting groove are spaced, the groove extends in the circumferential direction of the box body and surrounds the mounting groove, and the cover plate is used for blocking the mounting groove and the groove; and the sealing element is annularly arranged in the groove. According to the battery box disclosed by the utility model, in the two side walls in the width direction of the groove, the inner side wall can block the influence of high-temperature gas on the sealing element during thermal runaway, and the outer side wall can reduce the influence of external air and water on the sealing element, so that the reliability of the sealing element is improved, and the sealing element is ensured to be prevented from being damaged during thermal runaway. And the sealing element can still effectively prevent external air from entering the mounting groove, so that the battery cell is prevented from violently reacting with the external air during thermal runaway, the thermal runaway degree is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box body and a battery pack. Background Art

[0002] With the continuous popularization and development of new energy vehicles, the problem of thermal runaway of power battery packs has become more frequent and serious. Most of the seals between the upper cover and the box body of the battery pack cannot withstand high-temperature and high-intensity flame impacts. Over time, the sealing effect is likely to be lost, resulting in outside air entering the interior of the battery pack and contacting the thermally runaway battery cells, thereby accelerating their thermal runaway. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery box body, which improves the reliability of the seal, thereby avoiding a violent reaction between the battery cells and the outside air during thermal runaway, reducing the degree of thermal runaway, and improving safety.

[0004] The utility model also provides a battery pack, including the above-mentioned battery box body.

[0005] The battery box body according to the embodiment of the utility model includes: a cover plate; a box body disposed on one side in the thickness direction of the cover plate. The side of the box body facing the cover plate has a mounting groove and a groove. The groove and the mounting groove are spaced apart. The groove extends along the circumferential direction of the box body and surrounds the mounting groove. The cover plate is used to block the mounting groove and the groove; a seal disposed annularly in the groove.

[0006] According to the battery box body of the embodiment of the utility model, the side of the box body facing the cover plate has a mounting groove and a groove. The groove and the mounting groove are spaced apart. The groove extends along the circumferential direction of the box body and surrounds the mounting groove. By disposing the seal annularly in the groove, among the two side walls in the width direction of the groove, the inner side wall can prevent the high-temperature gas during thermal runaway from affecting the seal, and the outer side wall can reduce the influence of outside air and water on the seal, thereby improving the reliability of the seal and ensuring that during thermal runaway, the seal can still effectively block the outside air from entering the mounting groove, thereby avoiding a violent reaction between the battery cells and the outside air during thermal runaway, reducing the degree of thermal runaway, and improving safety.

[0007] In some embodiments of the present invention, the radial inner end of the box body has a first annular protrusion protruding toward the cover plate and extending along the circumferential direction of the box body, and the radial outer end of the box body has a second annular protrusion protruding toward the cover plate and extending along the circumferential direction of the box body, the first annular protrusion and the second annular protrusion are spaced apart in the radial direction of the box body, and the groove is formed between the first annular protrusion and the second annular protrusion.

[0008] In some embodiments of the present invention, one end of the box body facing the cover plate is recessed into the bottom wall of the installation groove to form the groove.

[0009] In some embodiments of the present invention, the box body, the sealing member and the cover plate are connected by fasteners.

[0010] In some embodiments of the present invention, the fasteners are multiple and spaced apart along the circumferential direction of the box body.

[0011] In some embodiments of the utility model, the fastener includes a head, an extension and a gasket, the extension is passed through the box body, the seal and the cover, the head is arranged on the side of the cover away from the box body, and the gasket is sleeved on the extension and arranged between the cover and the head.

[0012] In some embodiments of the present invention, the diameter of the gasket is greater than the width of the groove.

[0013] In some embodiments of the present invention, the sealing member and the cover plate are interference fit, and the compression amount of the sealing member is 10%-50%.

[0014] In some embodiments of the present invention, the width of the groove is greater than the width of the seal, the inner peripheral wall of the groove is spaced apart from the peripheral wall of the seal to form an escape space, and the width of the escape space is 10-30% of the width of the seal.

[0015] A battery pack according to an embodiment of the present invention includes the above-mentioned battery box.

[0016] According to the battery pack of the embodiment of the present utility model, by providing the above-mentioned battery box body, one side of the box body facing the cover plate has an installation groove and a groove, the groove and the installation groove are spaced apart, the groove extends along the circumferential direction of the box body and surrounds the installation groove, and the sealing member is arranged in the groove in a ring shape. Among the two side walls in the width direction of the groove, the inner side wall can prevent the high-temperature gas during thermal runaway from affecting the sealing member, and the outer side wall can reduce the influence of external air and water on the sealing member, thereby improving the reliability of the sealing member. It is ensured that during thermal runaway, the sealing member can still effectively block the entry of external air into the installation groove, thereby avoiding a violent reaction between the battery cells and external air during thermal runaway, reducing the degree of thermal runaway, and improving safety.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an exploded view of the battery pack according to the embodiment of the present utility model;

[0020] Figure 2 is a perspective view of the box body of the battery box body according to the embodiment of the present utility model;

[0021] Figure 3 is a top view of the battery pack according to the embodiment of the present utility model;

[0022] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0023] Figure 5 is Figure 4 an enlarged view of part B in

[0024] REFERENCE NUMERALS:

[0025] 100, battery pack;

[0026] 10, battery box body;

[0027] 1, box body; 11, installation groove; 12, groove; 13, first annular protrusion; 14, second annular protrusion;

[0028] 2, cover plate;

[0029] 3, sealing member;

[0030] 4, fastener; 41, head; 42, gasket; 43, extension part;

[0031] 20. Battery cell. Specific implementation manner

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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 thus should not be construed as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "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 utility model can be understood according to specific situations.

[0035] Next, refer to Figures 1-5 Describe the battery box body 10 according to the embodiment of the present utility model.

[0036] As Figures 1-5 shown, the battery box body 10 according to the embodiment of the present utility model includes: a box body 1, a sealing member 3, and a cover plate 2.

[0037] Specifically, refer to Figures 1-5, the box body 1 is arranged on one side in the thickness direction of the cover plate 2. One side of the box body 1 facing the cover plate 2 has a mounting groove 11 and a groove 12. The groove 12 and the mounting groove 11 are spaced apart. The groove 12 extends along the circumferential direction of the box body 1 and is arranged around the mounting groove 11. The cover plate 2 is used to seal the mounting groove 11 and the groove 12, and the seal 3 is arranged around the groove 12.

[0038] Among them, it should be noted that the mounting groove 11 is used to mount the battery cell 20. When the cover plate 2 is connected to the box body 1, the setting of the seal 3 can improve the sealing performance of the battery box body 10, thereby preventing water from entering the mounting groove 11, and at the same time, it can also prevent external air from entering the mounting groove 11, so as to avoid a violent reaction between the battery cell 20 and the external air during thermal runaway and reduce the degree of thermal runaway.

[0039] It can be understood that since the seal 3 is arranged in the groove 12, thus, among the two side walls in the width direction of the groove 12, the inner side wall can block the influence of the high-temperature gas during thermal runaway on the seal 3, thereby ensuring that the seal 3 does not fail during thermal runaway, and the seal 3 can still effectively block external air from entering the mounting groove 11, so as to avoid a violent reaction between the battery cell 20 and the external air during thermal runaway and reduce the degree of thermal runaway. At the same time, the outer side wall can reduce the influence of external air and water on the seal 3, improve the durability of the seal 3, and thus further improve the reliability of the seal 3.

[0040] At the same time, the setting of the groove 12 can improve the limiting effect on the seal 3, thereby avoiding the seal 3 from moving and failing, and at the same time, it can play a role in initially positioning the installation of the seal 3, improving the installation accuracy and installation efficiency of the seal 3. Among them, the seal 3 and the bottom wall of the groove 12 can be connected by bonding or other means.

[0041] According to the battery box body 10 of the embodiment of the present invention, by having a mounting groove 11 and a groove 12 on one side of the box body 1 facing the cover plate 2, the groove 12 and the mounting groove 11 are spaced apart, the groove 12 extends along the circumferential direction of the box body 1 and is arranged around the mounting groove 11, and the seal 3 is arranged around the groove 12, so that among the two side walls in the width direction of the groove 12, the inner side wall can block the influence of the high-temperature gas during thermal runaway on the seal 3, and the outer side wall can reduce the influence of external air and water on the seal 3, thereby improving the reliability of the seal 3, ensuring that during thermal runaway, the seal 3 can still effectively block external air from entering the mounting groove 11, so as to avoid a violent reaction between the battery cell 20 and the external air during thermal runaway and reduce the degree of thermal runaway, and improving the safety.

[0042] In some embodiments of the present invention, such as Figure 1 and Figure 2As shown, the radial inner end of the box body 1 has a first annular protrusion 13 that protrudes toward the cover plate 2 and extends along the circumferential direction of the box body 1, and the radial outer end of the box body 1 has a second annular protrusion 14 that protrudes toward the cover plate 2 and extends along the circumferential direction of the box body 1. The first annular protrusion 13 and the second annular protrusion 14 are spaced apart in the radial direction of the box body 1, and a groove 12 is formed between the first annular protrusion 13 and the second annular protrusion 14.

[0043] It can be understood that the first annular protrusion 13 can prevent the high-temperature gas during thermal runaway from affecting the seal 3, and the second annular protrusion 14 can reduce the impact of external air and water on the seal 3, thereby improving the reliability of the seal 3 and ensuring that during thermal runaway, the seal 3 can still effectively block external air from entering the mounting groove 11, thereby avoiding a violent reaction between the battery cell 20 and the external air during thermal runaway, reducing the degree of thermal runaway, and improving safety.

[0044] The arrangement of the first annular protrusion 13 and the second annular protrusion 14 eliminates the need to make grooves on the box body 1, thereby improving the structural strength of the box body 1 and improving the structural reliability.

[0045] In some embodiments of the present invention, one end of the box body 1 facing the cover plate 2 is recessed into the bottom wall of the mounting groove 11 to form a groove 12. It can be understood that by directly opening the groove 12 on the box body 1, the weight of the box body 1 is reduced, which is conducive to the lightweight of the battery box 10.

[0046] In some embodiments of the present invention, Figures 1-5 As shown, the box body 1, the seal 3 and the cover plate 2 are connected by the fastener 4. It can be understood that the bottom wall of the groove 12 is provided with a connection hole, so that the fastener 4 can be sequentially penetrated on the cover plate 2, the seal 3 and the box body 1. The box body 1, the seal 3 and the cover plate 2 are connected by the fastener 4, which can improve the connection reliability between the box body 1, the seal 3 and the cover plate 2, making the structure of the battery box 10 more reliable.

[0047] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the fasteners 4 are multiple and spaced apart along the circumferential direction of the box body 1. Thus, the connection reliability between the box body 1, the seal 3 and the cover plate 2 is further improved, making the structure of the battery box 10 more reliable.

[0048] For example, Figure 1 and Figure 3 In the example shown, there are 12 fasteners 4 , but the present invention is not limited thereto, and the fasteners 4 may be other numbers, such as 2, 5, 14 or 16.

[0049] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the fastener 4 includes a head 41, an extension 43 and a gasket 42, the extension 43 is passed through the box body 1, the seal 3 and the cover 2, the head 41 is arranged on the side of the cover 2 away from the box body 1, and the gasket 42 is sleeved on the extension 43 and arranged between the cover 2 and the head 41.

[0050] It can be understood that the head 41 is arranged on the side of the cover 2 away from the box body 1, so as to facilitate the removal and installation of the fastener 4. The setting of the gasket 42 can reduce the stress concentration of the fastener 4 on the cover 2, thereby avoiding dents and cracks in the cover 2 and improving the structural durability of the battery box 10.

[0051] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the diameter of the gasket 42 is greater than the width of the groove 12. It is understandable that the diameter of the gasket 42 is greater than the width of the groove 12, so that the box body 1 located on both sides of the width direction of the groove 12 can support and limit the gasket 42, thereby preventing the fastener 4 from being over-tightened and causing the cover plate 2 to be dented and cracked, and also preventing the seal 3 from being over-deformed and compressed, ensuring the service life of the seal 3, thereby further improving the structural durability of the battery box 10.

[0052] In some embodiments of the utility model, the seal 3 is interference fit with the cover plate 2, and the compression amount of the seal 3 is 10%-50%. It can be understood that the seal 3 is interference fit with the cover plate 2, and the gap between the seal 3 and the cover plate 2 is further reduced, thereby further improving the seal 3 of the battery box 10, and at the same time improving the installation stability of the seal 3, avoiding the movement of the seal 3, and improving the sealing reliability of the seal 3.

[0053] The height of the seal 3 when not installed is greater than the depth of the groove 12 . When installed, the seal 3 contacts the cover plate 2 , and the cover plate 2 applies pressure to cause the seal 3 to deform, thereby achieving an interference fit between the seal 3 and the cover plate 2 .

[0054] Further, the thickness of the seal 3 along the thickness direction of the cover plate 2 is 4 mm, 5 mm or 10 mm, etc., and the compression amount of the seal 3 is 10%-50%, such as 10%, 20%, 30% or 50%, etc., thereby making the seal 3 have a suitable compression amount, on the one hand, it can avoid excessive compression of the seal 3, thereby ensuring the service life of the seal 3. On the other hand, the seal 3 is compressed and deformed enough, so as to facilitate the interference fit between the seal 3 and the cover plate 2, and ensure the sealing of the battery box 10.

[0055] Among them, it should be noted that the compression amount represents the ratio of the difference between the original length of the seal 3 along the compression direction and the length of the seal 3 after compression to the original length of the seal 3. For example, in the present utility model, the seal 3 is compressed in the thickness direction of the cover plate 2, and the thickness of the seal 3 along the thickness direction of the cover plate 2 after compression is equal to the depth of the groove along the thickness direction of the cover plate 2. Taking the thickness of the seal 3 along the thickness direction of the cover plate 2 as 10 mm and the depth of the groove as 8 mm as an example, before the seal 3 is compressed, the thickness is 10 mm, and after the seal 3 is compressed, the thickness of the seal 3 is equal to the depth of the groove, that is, 8 mm. Then the compression amount of the seal 3 is 20%.

[0056] In some embodiments of the present utility model, such as Figure 4 and Figure 5 shown, the width of the groove 12 is greater than the width of the seal 3, and the inner peripheral wall of the groove 12 is spaced apart from the peripheral wall of the seal 3 to form an avoidance space.

[0057] It can be understood that the height of the seal 3 when not installed is greater than the depth of the groove 12, and the width of the seal 3 when not installed is less than the width of the groove 12. When installed, the seal 3 contacts the cover plate 2, and the pressure applied by the cover plate 2 causes the seal 3 to be compressed and deformed. The height of the seal 3 decreases, and the width of the seal 3 increases. The setting of the avoidance space enables the seal 3 to undergo compression deformation smoothly, thereby facilitating the interference fit between the seal 3 and the cover plate 2 and avoiding installation interference between the seal 3 and the cover plate 2.

[0058] Furthermore, as Figure 4 and Figure 5 shown, the width of the avoidance space is 10 - 30% of the width of the seal 3, such as 10%, 15%, 20% or 30%, etc. Thus, the avoidance space has a suitable width. On the one hand, it can avoid the avoidance space being too small, further facilitating the smooth compression deformation of the seal 3, thereby facilitating the interference fit between the seal 3 and the cover plate 2 and avoiding installation interference between the seal 3 and the cover plate 2. On the other hand, it can avoid the avoidance space being too large, thereby facilitating the reduction of the volume of the battery box 10 and being beneficial to the lightweight of the battery box 10.

[0059] Next, refer to the attached Figures 1-5 to describe the battery pack 100 according to the embodiments of the present utility model.

[0060] As Figures 1-5 shown, the battery pack 100 according to the embodiments of the present utility model includes the above-mentioned battery box 10.

[0061] According to the battery pack 100 of the embodiment of the present utility model, by providing the above-mentioned battery box body 10, one side of the box body 1 facing the cover plate 2 has a mounting groove 11 and a groove 12. The groove 12 and the mounting groove 11 are spaced apart. The groove 12 extends along the circumferential direction of the box body 1 and is arranged around the mounting groove 11. The seal 3 is arranged in a ring shape in the groove 12. Among the two side walls in the width direction of the groove 12, the inner side wall can prevent the high-temperature gas during thermal runaway from affecting the seal 3, and the outer side wall can reduce the influence of external air and water on the seal 3. Thereby, the reliability of the seal 3 is improved, ensuring that during thermal runaway, the seal 3 can still effectively block the entry of external air into the mounting groove 11, thus avoiding a violent reaction between the battery cells 20 and external air during thermal runaway, reducing the degree of thermal runaway, and improving safety.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery box, characterized in that: include: Cover plate; A box body, the box body is arranged on one side of the cover plate in the thickness direction, the box body has a mounting groove and a groove on one side facing the cover plate, the groove is spaced from the mounting groove, the groove extends along the circumferential direction of the box body and is arranged around the mounting groove, and the cover plate is used to block the mounting groove and the groove; A sealing member is disposed in the groove.

2. The battery box according to claim 1, characterized in that: The radial inner end of the box body has a first annular protrusion protruding toward the cover plate and extending in the circumferential direction of the box body, and the radial outer end of the box body has a second annular protrusion protruding toward the cover plate and extending in the circumferential direction of the box body, the first annular protrusion and the second annular protrusion are spaced apart in the radial direction of the box body, and the groove is formed between the first annular protrusion and the second annular protrusion.

3. The battery box according to claim 1, characterized in that: One end of the box body facing the cover plate is recessed toward the bottom wall of the mounting groove to form the groove.

4. The battery box according to claim 1, characterized in that: The box body, the sealing member and the cover plate are connected by fasteners.

5. The battery box according to claim 4, characterized in that: The fasteners are multiple and spaced apart from each other along the circumferential direction of the box body.

6. The battery case according to claim 4, characterized in that: The fastener includes a head, an extension and a gasket, the extension is passed through the box body, the seal and the cover, the head is arranged on the side of the cover away from the box body, and the gasket is sleeved on the extension and arranged between the cover and the head.

7. The battery case according to claim 6, characterized in that: The diameter of the gasket is greater than the width of the groove.

8. The battery box according to claim 1, characterized in that: The sealing member is interference-fitted with the cover plate, and the compression amount of the sealing member is 10%-50%.

9. The battery box according to claim 1, characterized in that: The width of the groove is greater than the width of the seal, the inner peripheral wall of the groove is spaced apart from the peripheral wall of the seal to form an escape space, and the width of the escape space is 10-30% of the width of the seal.

10. A battery pack, characterized in that: Comprising a battery case according to any one of claims 1-9.

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