Battery device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device which comprises a battery box, an isolation assembly, a pressure sensor and a box body pressure relief structure, the battery box comprises a bottom plate and a supporting beam, the supporting beam is arranged on one side of the bottom plate, the bottom plate and at least part of the supporting beam define a containing space, and at least part of the supporting beam is internally provided with a first exhaust channel; the isolation assembly is arranged in the accommodating space, the isolation assembly is at least used for isolating any box wall of the battery box from the single battery, and a second exhaust channel communicated to the first exhaust channel is arranged in the isolation assembly; the pressure sensor is arranged in the first exhaust channel and used for detecting the pressure value in the first exhaust channel and achieving pressure early warning. The box body pressure relief structure is arranged on a supporting beam provided with a first exhaust channel, and the first exhaust channel and the second exhaust channel are used for circulating overheated gas to the box body pressure relief structure when the single battery is in thermal runaway. The battery device can accurately obtain the thermal runaway condition of the single battery.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and more particularly, to a battery device. Background Art

[0002] A single battery is provided in a battery box. In the case of overheating of the single battery, overheated gas will be ejected, and the overheated gas can be discharged through an exhaust passage.

[0003] However, the current battery device cannot accurately know the thermal runaway situation of the single battery.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the present disclosure is to overcome the deficiencies of the above related technologies and provide a battery device.

[0006] According to one aspect of the present disclosure, a battery device is provided, including:

[0007] A battery box, including a bottom plate and support beams. The support beams are provided on one side of the bottom plate. The bottom plate and at least part of the support beams enclose to form a receiving space, and a first exhaust passage is provided in at least part of the support beams;

[0008] An isolation component is provided in the receiving space. The isolation component is at least used to isolate any box wall of the battery box and the single battery. A second exhaust passage is provided in the isolation component, and the second exhaust passage communicates with the first exhaust passage;

[0009] A pressure sensor is provided in the first exhaust passage. The pressure sensor is used to detect the pressure value in the exhaust passage and achieve pressure warning;

[0010] A box body pressure relief structure is provided on the support beam provided with the first exhaust passage. The first exhaust passage and the second exhaust passage are used to flow the overheated gas to the box body pressure relief structure when the single battery is in thermal runaway.

[0011] On the one hand, for the battery device of the present disclosure, a pressure sensor is provided in the first exhaust passage. The pressure value in the first exhaust passage can be detected through the pressure sensor, and pressure warning can be realized, so as to accurately warn of the thermal runaway of the single battery. On the other hand, the pressure sensor is arranged in the first exhaust passage within the support beam, so that the overheated gas ejected from the single battery will not directly spray onto the pressure sensor, avoiding damaging the pressure sensor. On the other hand, the second exhaust passage has a certain cooling and diffusion effect on the overheated gas ejected from the single battery. If the pressure sensor is arranged in the second exhaust passage closer to the single battery, the overheated gas will be detected by the pressure sensor before it has been cooled and diffused, resulting in an overly large detected pressure value and prone to false alarms. Arranging the pressure sensor in the first exhaust passage within the support beam is conducive to accurately obtaining the thermal runaway situation of the single battery.

[0012] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Brief Description of the Drawings

[0013] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic structural diagram of an exemplary embodiment of the battery device of the present disclosure.

[0015] Figure 2 is Figure 1 a schematic electrical connection structure diagram of the pressure sensor, the processor, and the warning component in

[0016] Description of the Reference Numerals:

[0017] 1. Battery box; 1a. Support beam; 11. Side beam; 11a. First side beam; 111. Inner frame wall; 1111. Through hole; 112. Outer frame wall; 1121. Third through hole; 113. First exhaust passage; 12. Bottom plate; 13. Accommodating space; 131. First accommodation cavity; 132. Second accommodation cavity; 14. Protection cover;

[0018] 2. Box body pressure relief structure; 21. Fixed part; 22. Pressure relief part;

[0019] 3. Isolation component; 31. First isolation plate; 311. First through hole; 32. Second isolation plate; 321. Second through hole; 33. Second exhaust passage;

[0020] 4. First battery pack; 41. First single battery; 41a. First bottom wall; 411. First explosion-proof valve;

[0021] 5. Second battery pack; 51. Second single battery; 51a. Second bottom wall; 511. Second explosion-proof valve;

[0022] 6. Pressure sensor; 7. Processor;

[0023] 8. Warning component; 81. Buzzer; 82. Light alarm;

[0024] 91. First potting glue part; 92. Second potting glue part;

[0025] Y. Second direction; Z. Third direction. Detailed implementation mode

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0027] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the icon to another component, these terms are used in this specification only for convenience, for example, according to the directions of the examples described in the accompanying drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" disposed on another structure, or that a structure is "indirectly" disposed on another structure through another structure.

[0028] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.; the terms "first", "second" and "third", etc. are used only as labels and are not a limitation on the number of their objects.

[0029] In this application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0030] This disclosure provides an exemplary embodiment of a battery device. Referring to Figures 1-2 As shown, the battery device may include a battery box 1, an isolation component 3, a pressure sensor 6, and a box body pressure relief structure 2; the battery box 1 may include a bottom plate 12 and a support beam 1a. The support beam 1a is provided on one side of the bottom plate 12. The bottom plate 12 and at least part of the support beam 1a enclose a receiving space 13. At least part of the support beam 1a is provided with a first exhaust channel 113; the isolation component 3 is provided in the receiving space 13. The isolation component 3 is at least used to isolate any wall of the battery box 1 and the single battery. A second exhaust channel 33 is provided in the isolation component 3, and the second exhaust channel 33 communicates with the first exhaust channel 113; the pressure sensor 6 is provided in the first exhaust channel 113. The pressure sensor 6 is used to detect the pressure value in the first exhaust channel 113 and implement pressure warning; the box body pressure relief structure 2 is provided on the support beam 1a where the first exhaust channel 113 is provided. The first exhaust channel 113 and the second exhaust channel 33 are used to flow the overheated gas to the box body pressure relief structure 2 when the single battery is in thermal runaway.

[0031] For the battery device of this disclosure, on the one hand, a pressure sensor 6 is provided in the first exhaust channel 113. Through the pressure sensor 6, the pressure value in the first exhaust channel 113 can be detected and pressure warning can be implemented, so as to accurately warn of the thermal runaway of the single battery; on the other hand, the pressure sensor 6 is provided in the first exhaust channel 113 in the support beam 1a, so that the overheated gas ejected from the single battery will not directly spray onto the pressure sensor 6, avoiding flushing the pressure sensor 6; on the third hand, the second exhaust channel 33 has a certain role in cooling and diffusing the overheated gas ejected from the single battery. If the pressure sensor 6 is set in the second exhaust channel 33 closer to the single battery, it will cause the overheated gas to be detected by the pressure sensor 6 before cooling and diffusing, resulting in an overly large detected pressure value and prone to false alarms. Setting the pressure sensor 6 in the first exhaust channel 113 in the support beam is beneficial to accurately know the thermal runaway of the single battery.

[0032] In this exemplary embodiment, referring to Figure 1As shown, the battery device may include a battery box 1, and the battery box 1 may be configured in a cuboid structure. Specifically, the battery box 1 may include a bottom plate 12, a protective cover 14, and support beams 1a. The support beams 1a are disposed on one side of the bottom plate 12. The support beams 1a may include four side beams 11. The four side beams 11 may include two first side beams 11a and two second side beams (not shown in the figure). The bottom plate 12 and the protective cover 14 may be configured as rectangles. Two first side beams 11a and two second side beams are provided around the perimeter of the bottom plate 12. The two first side beams 11a and the two second side beams are connected end to end to form a rectangular frame. The first side beams 11a extend in a first direction, and the second side beams extend in a second direction Y. A protective cover 14 is provided on the other side of the two first side beams 11a and the two second side beams opposite to the bottom plate 12, such that the protective cover 14 is disposed opposite to the bottom plate 12. The two first side beams 11a and the two second side beams are connected between the protective cover 14 and the bottom plate 12. The bottom plate 12 and at least part of the support beams 1a enclose a receiving space. Specifically, the bottom plate 12, the protective cover 14, the two first side beams 11a, and the two second side beams surround to form the receiving space 13 of the battery box 1.

[0033] It should be noted that both the first direction and the second direction Y are parallel to the bottom plate 12, and the first direction intersects with the second direction Y. For example, the first direction is perpendicular to the second direction Y, and a third direction Z is perpendicular to the bottom plate 12, such that the third direction Z is perpendicular to both the first direction and the second direction Y.

[0034] Of course, in some other exemplary embodiments of the present disclosure, the support beams 1a may further include partition beams. The partition beams are disposed in the receiving space 13. The partition beams may include longitudinal beams and cross beams. The partition beams may also include only longitudinal beams or only cross beams. The cross beams extend in the first direction, and the longitudinal beams extend in the second direction Y.

[0035] At least part of the support beams 1a is provided with a first exhaust passage 113. For example, the first exhaust passage 113 may be provided in the side beams 11 (the first side beams 11a). Of course, in the case where longitudinal beams and cross beams are provided, the first exhaust passage 113 may also be provided in the longitudinal beams and / or the cross beams.

[0036] In this exemplary embodiment, with reference to Figure 1As shown, the side beam 11 is provided with a hollow structure. For example, the side beam 11 can be a profile, and the cavity of the profile is the hollow structure of the side beam 11. Specifically, the side beam 11 has a top frame wall and a bottom frame wall arranged oppositely, and inner frame walls 111 and outer frame walls 112 arranged oppositely. The inner frame walls 111 are arranged close to the single battery, and the outer frame walls 112 are arranged away from the single battery. Moreover, the inner frame walls 111 and the outer frame walls 112 are arranged at intervals, and reinforcing ribs are also arranged between the inner frame walls 111 and the outer frame walls 112. The reinforcing ribs divide the space between the inner frame walls 111 and the outer frame walls 112 into multiple parts, and at least one part is the first exhaust passage 113, so that the side beam 11 is provided with the first exhaust passage 113.

[0037] In the present exemplary embodiment, with reference to Figure 1 As shown, the battery box 1 may further include an isolation component 3. The isolation component 3 is arranged in the accommodation space 13. The isolation component 3 is at least used to isolate any one wall of the battery box 1 and the single battery. Specifically, the isolation component 3 is arranged substantially parallel to the bottom plate 12. The isolation component 3 divides the accommodation space 13 into a first accommodation cavity 131 and a second accommodation cavity 132. Specifically, the space between the isolation component 3 and the protection cover 14 is the first accommodation cavity 131, and the space between the isolation component 3 and the bottom plate 12 is the second accommodation cavity 132. A first battery pack 4 is arranged in the first accommodation cavity 131, and the first battery pack 4 may include a first single battery 41. A second battery pack 5 is arranged in the second accommodation cavity 132, and the second battery pack 5 may include a second single battery 51. When the bottom plate 12 serves as a support to support the single battery, the first accommodation cavity 131 and the second accommodation cavity 132 are arranged vertically. Moreover, the isolation component 3 can be used to support the first battery pack 4 located above.

[0038] Of course, in some other exemplary embodiments of the present disclosure, the isolation component 3 can also be used to isolate the bottom plate 12 and the single battery; the isolation component 3 can also be used to isolate the side beam 11 and the single battery. In this case, only one layer of single battery is arranged in the battery box 1.

[0039] A second exhaust passage 33 is arranged in the isolation component 3, and the second exhaust passage 33 communicates with the first exhaust passage 113.

[0040] A pressure sensor 6 is provided in the first exhaust passage 113. Through the pressure sensor 6, the pressure value in the first exhaust passage 113 can be detected, and pressure warning can be realized, so as to accurately warn of the thermal runaway of the single battery. The pressure sensor 6 is arranged in the first exhaust passage 113 in the support beam 1a, so that the overheated gas ejected from the single battery will not directly spray onto the pressure sensor 6, avoiding washing away the pressure sensor 6; moreover, the second exhaust passage 33 has a certain cooling and diffusion effect on the overheated gas ejected from the single battery. If the pressure sensor 6 is arranged in the second exhaust passage 33 closer to the single battery, the overheated gas will be detected by the pressure sensor 6 before it has been cooled and diffused, resulting in an excessive detected pressure value and prone to false alarms. Arranging the pressure sensor 6 in the first exhaust passage 113 in the support beam is beneficial to accurately obtain the thermal runaway situation of the single battery.

[0041] In the present exemplary embodiment, a box body pressure relief structure 2 is provided on the support beam 1a provided with the first exhaust passage 113. For example, the box body pressure relief structure 2 is also provided on the side beam 11 (for example, the first side beam 11a). The first exhaust passage 113 and the second exhaust passage 33 are used to flow the overheated gas to the box body pressure relief structure 2 when the single battery is in thermal runaway, that is, the first exhaust passage 113 is connected to the box body pressure relief structure 2, so that the overheated gas ejected from the single battery can sequentially pass through the second exhaust passage 33 and the first exhaust passage 113 and flow to the box body pressure relief structure 2, and break through the box body pressure relief structure 2 and spray out from the box body pressure relief structure 2, avoiding affecting other single batteries and avoiding the explosion of the battery device.

[0042] In the present exemplary embodiment, the first single battery 41 can be a cylindrical battery. The first single battery 41 can include a first battery case. The first battery case can be set as a cylinder, that is, the first battery case can include a first cover plate and a first bottom wall 41a arranged oppositely. Both the first cover plate and the first bottom wall 41a are set as circular. A first side wall is connected between the first cover plate and the first bottom wall 41a, and the first side wall is set as a cylindrical shape. The first side wall, the first cover plate and the first bottom wall 41a surround to form a receiving cavity of the first single battery 41, and an electric core is arranged in the receiving cavity of the first battery case. Of course, the first single battery 41 can also be a quadrangular prism battery, a pentagonal prism battery, a hexagonal prism battery, etc.

[0043] The material of the first battery case can be aluminum, steel or other metal and alloy materials. Of course, it can also be other materials, which will not be elaborated here one by one.

[0044] A first explosion-proof valve 411 is provided on the first single battery 41. Specifically, refer to Figure 1As shown, a first explosion-proof valve 411 is provided on the first bottom wall 41a. The first explosion-proof valve 411 can be a weak structure provided on the first bottom wall 41a. After the battery cell undergoes thermal runaway, high-temperature gas, sparks, and high-temperature solid particles can break through the first explosion-proof valve 411 on the first bottom wall 41a and spray out from the first explosion-proof valve 411, preventing the first single battery 41 from exploding.

[0045] Specifically, the first explosion-proof valve 411 can be a scratch or a grooved channel provided on the first bottom wall 41a. The first explosion-proof valve 411 in the form of a scratch or a grooved channel structure can be provided on the inner side of the first bottom wall 41a close to the battery cell or on the outer side of the first bottom wall 41a facing away from the battery cell. The scratch can be formed by mechanical processing, and the grooved channel can be formed by photolithography or chemical etching. It can also be a weak structure where the thickness of the entire first explosion-proof valve 411 is thinner than that of other positions. In the present exemplary embodiment, the first explosion-proof valve 411 is a circular scratch provided on the first surface.

[0046] In the present exemplary embodiment, the second single battery 51 can be a cylindrical battery. The second single battery 51 can include a second battery case, and the second battery case can be set as a cylinder, that is, the second battery case can include a second cover plate and a second bottom wall 51a arranged oppositely. Both the second cover plate and the second bottom wall 51a are set as circular. A second side wall is connected between the second cover plate and the second bottom wall 51a, and the second side wall is set as a cylindrical shape. The second side wall, the second cover plate, and the second bottom wall 51a surround to form a receiving cavity of the second single battery 51, and a battery cell is arranged in the receiving cavity of the second battery case. Of course, the second single battery 51 can also be a quadrangular prism battery, a pentagonal prism battery, a hexagonal prism battery, etc.

[0047] The material of the second battery case can be aluminum, steel, or other metal and alloy materials. Of course, it can also be other materials, which will not be elaborated one by one here.

[0048] A second explosion-proof valve 511 is provided on the second single battery 51. Specifically, referring to Figure 1 As shown, a second explosion-proof valve 511 is provided on the second bottom wall 51a. The second explosion-proof valve 511 can be a weak structure provided on the second bottom wall 51a. After the battery cell undergoes thermal runaway, high-temperature gas, sparks, and high-temperature solid particles can break through the second explosion-proof valve 511 on the second bottom wall 51a and spray out from the second explosion-proof valve 511, preventing the second single battery 51 from exploding.

[0049] Specifically, the second explosion-proof valve 511 may be a scratch or a grooving provided on the second bottom wall 51a; the second explosion-proof valve 511 with a scratch or a grooving structure may be provided on the inner side of the second bottom wall 51a close to the battery cell, or may be provided on the outer side of the second bottom wall 51a facing away from the battery cell. The scratch may be formed by machining, and the grooving may be formed by photolithography or chemical etching. It may also be a weak structure where the thickness of the entire second explosion-proof valve 511 is thinner than that of other positions. In the present exemplary embodiment, the second explosion-proof valve 511 is a circular scratch provided on the second surface.

[0050] The second explosion-proof valve 511 of the second single battery 51 is disposed opposite to the first explosion-proof valve 411 of the first single battery 41. Specifically, the second bottom wall 51a is disposed directly opposite to the first bottom wall 41a, and the second explosion-proof valve 511 is also disposed directly opposite to the first explosion-proof valve 411; moreover, both the first explosion-proof valve 411 and the second explosion-proof valve 511 communicate with the second exhaust passage 33, so that the overheated gas ejected from the first explosion-proof valve 411 and the second explosion-proof valve 511 can be directly ejected into the second exhaust passage 33 and discharged through the second exhaust passage 33 to avoid affecting other single batteries and to prevent the battery device from exploding.

[0051] Specifically speaking, in the present exemplary embodiment, referring to Figure 1 As shown, the isolation component 3 may include a first isolation plate 31 and a second isolation plate 32; the second isolation plate 32 is spaced and disposed opposite to the first isolation plate 31, and the second exhaust passage 33 is formed between the second isolation plate 32 and the first isolation plate 31, so that the second exhaust passage 33 is provided inside the isolation component 3.

[0052] The first isolation plate 31 is disposed parallel to the bottom plate 12, and a plurality of first through holes 311 are provided on the first isolation plate 31. One first through hole 311 is disposed opposite to the first explosion-proof valve 411 of one first single battery 41, that is, the first explosion-proof valve 411 is not covered by the first isolation plate 31, so that the first explosion-proof valve 411 communicates with the second exhaust passage 33, and the overheated gas ejected from the first explosion-proof valve 411 can be directly ejected into the second exhaust passage 33 through the first through hole 311. The first through hole 311 is also a part of the second exhaust passage 33.

[0053] The second isolation plate 32 is disposed parallel to the bottom plate 12, and a plurality of second through holes 321 are provided on the second isolation plate 32. One second through hole 321 is disposed opposite to the second explosion-proof valve 511 of one second single battery 51, that is, the second explosion-proof valve 511 is not covered by the second isolation plate 32, so that the second explosion-proof valve 511 communicates with the second exhaust passage 33, and the overheated gas ejected from the second explosion-proof valve 511 can be directly ejected into the second exhaust passage 33 through the second through hole 321. The second through hole 321 is also a part of the second exhaust passage 33.

[0054] Moreover, the second through-hole 321 and the first through-hole 311 can be oppositely arranged. Specifically, the orthographic projection of the second through-hole 321 on the bottom plate 12 and the orthographic projection of the first through-hole 311 on the bottom plate 12 at least partially overlap. For example, the orthographic projection of the second through-hole 321 on the bottom plate 12 and the orthographic projection of the first through-hole 311 on the bottom plate 12 can be substantially completely overlapped, or a part of the orthographic projection of the second through-hole 321 on the bottom plate 12 and a part of the orthographic projection of the first through-hole 311 on the bottom plate 12 can be overlapped; thereby enabling the second explosion-proof valve 511 and the first explosion-proof valve 411 to be oppositely arranged. Correspondingly, the orthographic projection of the second explosion-proof valve 511 on the bottom plate 12 and the orthographic projection of the first explosion-proof valve 411 on the bottom plate 12 at least partially overlap. For example, the orthographic projection of the second explosion-proof valve 511 on the bottom plate 12 and the orthographic projection of the first explosion-proof valve 411 on the bottom plate 12 can be substantially completely overlapped, or a part of the orthographic projection of the second explosion-proof valve 511 on the bottom plate 12 and a part of the orthographic projection of the first explosion-proof valve 411 on the bottom plate 12 can be overlapped.

[0055] It should be noted that the overlap not only includes complete overlap, but also can have a certain error. Depending on the equipment and the manufacturing process, the error range is also different. Therefore, within the error range of the equipment and the manufacturing process, it is considered to be an overlap.

[0056] The first isolation plate 31 can isolate the overheated gas ejected from the second explosion-proof valve 511, preventing the overheated gas ejected from the second explosion-proof valve 511 from affecting the first single battery 41; similarly, the second isolation plate 32 can isolate the overheated gas ejected from the first explosion-proof valve 411, preventing the overheated gas ejected from the first explosion-proof valve 411 from affecting the second single battery 51, enabling the two layers of single batteries to be mutually non-interfering, basically achieving thermal isolation of the two layers of single batteries, and improving the safety of the battery device.

[0057] The second exhaust passage 33 shared by the two battery packs (the first battery pack 4 and the second battery pack 5) is beneficial to improving the space utilization rate of the accommodation space 13 of the battery box 1, thereby improving the energy density of the battery device.

[0058] Moreover, the two battery packs (the first battery pack 4 and the second battery pack 5) share a pressure sensor 6, which can reduce the number of pressure sensors 6 used, thereby reducing costs.

[0059] Optionally, the isolation component 3 can be arranged in the middle of the battery box 1 in the third direction Z, such that the heights of the first accommodation cavity 131 and the second accommodation cavity 132 are substantially the same, and the heights of the placed first battery pack 4 and second battery pack 5 are also substantially the same.

[0060] The pressure sensor 6 and the box pressure relief structure 2 are arranged on the same side beam 11, that is, the box pressure relief structure 2 is also arranged on the side beam 11 where the pressure sensor 6 is arranged, and the box pressure relief structure 2 is located on the side of the first exhaust channel 113 away from the accommodation space 13, and the first exhaust channel 113 is connected to the box pressure relief structure 2. The pressure sensor 6 is arranged on the side of the first exhaust channel 113 close to the accommodation space 13, so that the pressure sensor 6 is arranged on the side close to the second exhaust channel 33, so as to avoid the superheated gas ejected from the second exhaust channel 33 directly ejecting to the pressure sensor 6, so as to avoid the pressure sensor 6 being destroyed; and, to avoid the pressure value detected by the pressure sensor 6 being too large to generate a false alarm.

[0061] The box pressure relief structure 2 can be a weak structure arranged on the side beam 11. After the single cell has thermal runaway, the high-temperature gas, sparks and high-temperature solid particles can break through the box pressure relief structure 2 on the side beam 11 and spray out from the box pressure relief structure 2 to avoid affecting other single cells and preventing the battery device from exploding.

[0062] In this example implementation, refer to Figure 1 As shown, the box pressure relief structure 2 may include a fixing portion 21 and a pressure relief portion 22, the fixing portion 21 is arranged around the outer periphery of the pressure relief portion 22, the thickness of the pressure relief portion 22 is less than the thickness of the fixing portion 21, and the connection strength between the box pressure relief structure 2 and the outer frame wall 112 is ensured while ensuring that the pressure relief portion 22 can smoothly relieve pressure. The fixing portion 21 can be fixedly connected to the outer frame wall 112 by screws, or the fixing portion 21 can be fixedly connected to the outer frame wall 112 by welding, so that the box pressure relief structure 2 is fixedly connected to the outer frame wall 112.

[0063] Of course, in some other exemplary embodiments of the present disclosure, the box pressure relief structure 2 may be a scratch or a groove arranged on the outer frame wall 112 of the side beam 11; the box pressure relief structure 2 with a scratch or a groove structure may be arranged on the inner side of the outer frame wall 112 close to the single battery, or may be arranged on the outer side of the outer frame wall 112 away from the single battery. The scratch may be formed by mechanical processing, and the groove may be formed by photolithography or chemical etching. It may also be a weak structure in which the thickness of the entire box pressure relief structure 2 is thinner than the thickness at other locations.

[0064] In this example implementation, refer to Figure 1As shown, the box body pressure relief structure 2 is fixed to the frame wall of the side beam 11 facing away from the accommodation space 13, that is, the box body pressure relief structure 2 is fixed to the outer frame wall 112; a third through hole 1121 is provided on the frame wall of the side beam 11 facing away from the accommodation space 13, that is, a third through hole 1121 is provided on the outer frame wall 112, and the third through hole 1121 penetrates to the first exhaust passage 113. At least part of the box body pressure relief structure 2 is arranged opposite to the third through hole 1121. For example, the entire box body pressure relief structure 2 can be arranged opposite to the third through hole 1121, or the pressure relief part 22 of the box body pressure relief structure 2 for pressure relief can be arranged opposite to the third through hole 1121, and the fixing part 21 for fixing is not arranged opposite to the third through hole 1121; thus, the first exhaust passage 113 is communicated with the box body pressure relief structure 2.

[0065] Since the overheated gas is sprayed from the second exhaust passage 33 to the first exhaust passage 113 through the through hole 1111 and finally sprayed to the box body pressure relief structure 2 at the third through hole 1121, both the second exhaust passage 33 and the first exhaust passage 113 have a certain cooling and flow splitting effect on the overheated gas, so that the amount of the overheated gas finally sprayed into the box body pressure relief structure 2 in the third through hole 1121 will be reduced to a certain extent.

[0066] Moreover, the pressure sensor 6 is arranged in the first exhaust passage 113, that is, the pressure sensor 6 is not arranged in the second exhaust passage 33, so as to avoid the overheated gas ejected from the first explosion-proof valve 411 and the second explosion-proof valve 511 directly spraying onto the pressure sensor 6 and damaging the pressure sensor 6; moreover, the exhaust passage 15 has a certain cooling and diffusion effect on the overheated gas ejected from the first explosion-proof valve 411 and the second explosion-proof valve 511. If the pressure sensor 6 is arranged in the second exhaust passage 33 closer to the single battery, the overheated gas will be detected by the pressure sensor 6 before it has been cooled and diffused, resulting in an excessive detected pressure value and prone to false alarms.

[0067] The pressure sensor 6 is arranged on the side beam 11 where the box body pressure relief structure 2 is arranged, that is, the box body pressure relief structure 2 is arranged on the side beam 11 where the pressure sensor 6 is arranged, so that the pressure measured by the pressure sensor 6 is closer to the pressure at the box body pressure relief structure 2, that is, the pressure measured by the pressure sensor 6 is more accurate, and whether the box body pressure relief structure 2 is about to be broken through can be accurately determined through the pressure value.

[0068] The minimum distance between the pressure sensor 6 and the box body pressure relief structure 2 is greater than 0 and less than or equal to 100 mm. For example, the minimum distance between the pressure sensor 6 and the box body pressure relief structure 2 can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, and so on.

[0069] If the minimum distance between the pressure sensor 6 and the box body pressure relief structure 2 is too large, the pressure value detected by the pressure sensor 6 will be too small and inaccurate, and it is impossible to accurately predict whether the box body pressure relief structure 2 is about to be broken through based on the pressure value.

[0070] If the minimum distance between the pressure sensor 6 and the box body pressure relief structure 2 is too small, during the blasting process of the box body pressure relief structure 2, an impact force will be generated on the pressure sensor 6, causing the pressure sensor 6 to be damaged.

[0071] The above numerical range not only ensures that the pressure value detected by the pressure sensor 6 can accurately predict whether the box body pressure relief structure 2 is about to be broken through; but also ensures that during the blasting process of the box body pressure relief structure 2, the pressure sensor 6 will not be damaged.

[0072] It should be noted that the minimum distance between the pressure sensor 6 and the box body pressure relief structure 2 refers to the minimum straight-line distance between the pressure sensor 6 and the box body pressure relief structure 2.

[0073] Refer to Figure 1 As shown, the battery device may further include a first potting glue part 91 and a second potting glue part 92; the first potting glue part 91 is filled in the first accommodating cavity 131. Specifically, the first potting glue part 91 is filled between adjacent first single cells 41, and between the first single cell 41 and the battery box 1, so as to fix the first single cell 41 in the first accommodating cavity 131 and ensure the insulation performance between adjacent first single cells 41; the second potting glue part 92 is filled in the second accommodating cavity 132. Specifically, the second potting glue part 92 is filled between adjacent second single cells 51, and between the second single cell 51 and the battery box 1, so as to fix the second single cell 51 in the second accommodating cavity 132 and ensure the insulation performance between adjacent second single cells 51.

[0074] A through hole 1111 is provided on the frame wall of the side beam 11 close to the accommodation space 13. The through hole 1111 communicates with the first exhaust passage 113 and the second exhaust passage 33, that is, a through hole 1111 penetrating to the first exhaust passage 113 is provided on the inner frame wall 111 of the side beam 11. The through hole 1111 can be set as a circular through hole, and the circular through hole can better cooperate with the box body pressure relief structure 2, that is, the shape of the through hole 1111 can be adapted to the shape of the box body pressure relief structure 2. Of course, the through hole 1111 can also be set as a rectangular through hole, various polygonal through holes, etc.

[0075] The first through hole 311, the second exhaust passage 33, the through hole 1111, and the first exhaust passage 113 are sequentially communicated to form an exhaust passage of the first battery pack 4 and are communicated to the box body pressure relief structure 2.

[0076] The second through hole 321, the second exhaust passage 33, the through hole 1111, and the first exhaust passage 113 are sequentially communicated to form an exhaust passage of the second battery pack 5 and are communicated to the box body pressure relief structure 2. The first battery pack 4 and the second battery pack 5 share the second exhaust passage 33, the through hole 1111, the first exhaust passage 113, and the box body pressure relief structure 2.

[0077] The overheated gas ejected from the first explosion-proof valve 411 and the second explosion-proof valve 511 can be directly ejected into the second exhaust passage 33, and the second exhaust passage 33, the through hole 1111, the first exhaust passage 113, and the box body pressure relief structure 2 are sequentially communicated, so that the overheated gas ejected into the second exhaust passage 33 can sequentially pass through the through hole 1111 and the first exhaust passage 113 and be ejected to the box body pressure relief structure 2, breaking through the box body pressure relief structure 2 and ejecting from the box body pressure relief structure 2, avoiding affecting other single cells and avoiding explosion of the battery device.

[0078] The minimum distance between the pressure sensor 6 and the through hole 1111 is greater than 0 mm and less than or equal to 100 mm. For example, the minimum distance between the pressure sensor 6 and the through hole 1111 can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, etc.

[0079] If the minimum distance between the pressure sensor 6 and the through hole 1111 is too small, the gas ejected from the through hole 1111 into the first exhaust passage 113 will generate an impact force on the pressure sensor 6, resulting in the pressure sensor 6 being easily damaged by the impact.

[0080] If the minimum distance between the pressure sensor 6 and the through hole 1111 is too large, the pressure value detected by the pressure sensor 6 will be too small and inaccurate, and it is impossible to accurately predict whether the box body pressure relief structure 2 is about to be broken through based on the pressure value.

[0081] The above numerical range not only ensures that it is possible to accurately predict whether the box body pressure relief structure 2 is about to be broken through based on the pressure value detected by the pressure sensor 6; but also ensures that the gas sprayed from the through hole 1111 to the first exhaust passage 113 will not generate an impact force on the pressure sensor 6, and will not cause the pressure sensor 6 to be easily damaged due to impact.

[0082] It should be noted that the minimum distance between the pressure sensor 6 and the through hole 1111 refers to the minimum straight-line distance between the pressure sensor 6 and the through hole 1111. In the case where there are multiple through holes 1111, the through hole 1111 refers to the through hole 1111 that is directly opposite to the box body pressure relief structure 2.

[0083] The ratio of the opening area of the through hole 1111 to the total area of the pressure relief part 22 of the box body pressure relief structure 2 is greater than or equal to 1 and less than or equal to 5. For example, the ratio of the opening area of the through hole 1111 to the total area of the pressure relief part 22 of the box body pressure relief structure 2 can be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, etc.

[0084] If the ratio of the opening area of the through hole 1111 to the total area of the pressure relief part 22 of the box body pressure relief structure 2 is too large, the opening area of the through hole 1111 will be too large, resulting in a low strength of the side beam 11 and being insufficient to support the battery device.

[0085] If the ratio of the opening area of the through hole 1111 to the total area of the pressure relief part 22 of the box body pressure relief structure 2 is too small, the opening area of the through hole 1111 will be too small. In the case where the single battery overheats, the overheated gas is not easily discharged from the second exhaust passage 33 through the through hole 1111 to the first exhaust passage 113, resulting in the accumulation of the overheated gas in the second exhaust passage 33, which affects other single batteries and may cause a safety accident.

[0086] The above numerical range not only ensures that the strength of the side beam 11 is sufficient to support the battery device; but also ensures that the overheated gas is easily discharged from the second exhaust passage 33 through the through hole 1111 to the first exhaust passage 113, avoiding the accumulation of the overheated gas in the second exhaust passage 33 and affecting other single batteries.

[0087] In the present exemplary embodiment, a warning component 8 may be provided. The warning component 8 is electrically connected to the pressure sensor 6. The warning component 8 is used to give a warning according to the pressure value detected by the pressure sensor 6. Through the pressure sensor 6 and the warning component 8, the thermal runaway situation of the single battery can be accurately warned. Refer to Figure 2As shown, the warning component 8 may include a processor 7 and a buzzer 81. The processor 7 is electrically connected to the output end of the pressure sensor 6, and the buzzer 81 is electrically connected to the output end of the processor 7. The processor 7 is configured to control the buzzer 81 to give an alarm according to the pressure value detected by the pressure sensor 6. For example, when the pressure value detected by the pressure sensor 6 is 75% - 95% of the explosion-proof valve bursting pressure, the processor 7 controls the buzzer 81 to intermittently beep at a first interval time; when the pressure value detected by the pressure sensor 6 is 95% - 105% of the explosion-proof valve bursting pressure, the processor 7 controls the buzzer 81 to intermittently beep at a second interval time, and the second interval is less than the first interval time; when the pressure value detected by the pressure sensor 6 is greater than 105% of the explosion-proof valve bursting pressure, the processor 7 controls the buzzer 81 not to intermittently beep.

[0088] Optionally, the warning component 8 may further include a light alarm 82. The light alarm 82 is electrically connected to the output end of the processor 7. The processor 7 is configured to control the light alarm 82 to give a differentiated display according to the pressure value detected by the pressure sensor 6. For example, when the pressure value detected by the pressure sensor 6 is 75% - 95% of the explosion-proof valve bursting pressure, the processor 7 controls the light alarm 82 to flash a yellow light; when the pressure value detected by the pressure sensor 6 is 95% - 105% of the explosion-proof valve bursting pressure, the processor 7 controls the light alarm 82 to light a red light and keep it on without flashing; when the pressure value detected by the pressure sensor 6 is greater than 105% of the explosion-proof valve bursting pressure, the processor 7 controls the light alarm 82 to flash a red light.

[0089] Of course, in some other exemplary embodiments of the present disclosure, the warning component 8 may only include the processor 7 and the light alarm 82. The warning component 8 may further include a display screen to display the pressure value detected by the pressure sensor 6, and may give a differentiated display according to the pressure value, which will not be elaborated here one by one.

[0090] In addition, in some other exemplary embodiments of the present disclosure, a display may also be provided. The display is electrically connected to the pressure sensor 6 to display the pressure value detected by the pressure sensor 6, so as to accurately know the thermal runaway situation of the single battery.

[0091] The "parallel" and "perpendicular" mentioned in this application may not only be completely parallel and perpendicular, but may also have a certain error. For example, when the included angle between the two is greater than or equal to 0° and less than or equal to 5°, it is considered that the two are parallel to each other; when the included angle between the two is greater than or equal to 85° and less than or equal to 95°, it is considered that the two are perpendicular to each other.

[0092] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery device, characterized in that, include: A battery box, comprising a bottom plate and a support beam, wherein the support beam is arranged on one side of the bottom plate, the bottom plate and at least a portion of the support beam are surrounded to form a receiving space, and a first exhaust channel is arranged in at least a portion of the support beam; An isolation component is arranged in the accommodation space, the isolation component is used to isolate at least any one box wall of the battery box and the single battery, and a second exhaust channel is arranged in the isolation component, and the second exhaust channel is connected to the first exhaust channel; A pressure sensor is provided in the first exhaust passage, and is used to detect the pressure value in the first exhaust passage and realize pressure early warning; The box pressure relief structure is arranged on the support beam provided with the first exhaust channel, and the first exhaust channel and the second exhaust channel are used to flow hot gas to the box pressure relief structure when the single battery has thermal runaway.

2. The battery device according to claim 1, wherein, The isolation assembly divides the accommodation space into a first accommodation chamber and a second accommodation chamber, and the battery device further includes: A first battery pack is disposed in the first accommodation cavity, and the first battery pack includes a first single battery; The second battery pack is arranged in the second accommodation cavity, and the second battery pack includes a second single battery. The second explosion-proof valve of the second single battery is arranged opposite to the first explosion-proof valve of the first single battery, and both are connected to the second exhaust channel.

3. The battery device according to claim 2, characterized in that, The isolation assembly is arranged at the middle of the battery box in a third direction, and the third direction is perpendicular to the bottom plate of the battery box.

4. The battery device according to claim 1, characterized in that, The support beam includes a side beam, the first exhaust channel is arranged on the side beam, the box pressure relief structure is arranged on the side beam, and the box pressure relief structure is located on a side of the first exhaust channel away from the accommodating space.

5. The battery device according to claim 4, wherein, The pressure sensor and the box pressure relief structure are arranged on the same side beam, and the pressure sensor is arranged on a side of the first exhaust passage close to the accommodating space.

6. The battery device according to claim 5, characterized in that, The minimum distance between the pressure sensor and the box pressure relief structure is greater than 0 and less than or equal to 100 mm.

7. The battery device according to claim 4, characterized in that, A through hole is provided on the frame wall of the side beam close to the accommodating space, and the through hole is connected with the second exhaust channel and the first exhaust channel.

8. The battery device according to claim 7, wherein, The minimum distance between the pressure sensor and the through hole is greater than 0 and less than or equal to 100 mm.

9. The battery device according to claim 7, characterized in that, The ratio of the total opening area of ​​the through holes to the total area of ​​the pressure relief portion of the box pressure relief structure is greater than or equal to 1 and less than or equal to 5.

10. The battery device according to claim 2, characterized in that, The isolation assembly comprises: a first isolation plate, wherein a first through hole is disposed on the first isolation plate, and the first through hole is disposed opposite to the first explosion-proof valve so as to connect the first explosion-proof valve to the second exhaust passage; a second isolation plate, spaced apart from and arranged opposite to the first isolation plate, the second exhaust passage being between the second isolation plate and the first isolation plate, the second isolation plate being provided with a second through hole, the second through hole being arranged opposite to the second explosion-proof valve so that the second explosion-proof valve is connected to the second exhaust passage; The orthographic projection of the first through hole on the bottom plate of the battery box coincides at least partially with the orthographic projection of the second through hole on the bottom plate of the battery box, and the orthographic projection of the first explosion-proof valve on the bottom plate of the battery box coincides at least partially with the orthographic projection of the second explosion-proof valve on the bottom plate of the battery box.

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