Longeron and battery pack

Abstract

The application relates to the battery technical field and provides a longitudinal beam and a battery pack. The longitudinal beam of the application is arranged in a lower box of the battery pack and comprises a positioning part and a bearing part arranged at an interval in an up-down direction and a supporting part connecting the positioning part and the bearing part, an exhaust groove is formed among the positioning part, the supporting part and the bearing part; the bearing part is used for bearing a battery cell, the positioning part is used for positioning the spacing between the battery cell and the supporting part in the width direction of the longitudinal beam, and the exhaust groove is used for guiding the thermal runaway gas discharged at a battery cell explosion-proof valve of the battery cell to a battery pack explosion-proof valve. The longitudinal beam provided by the application can form an exhaust passage between the longitudinal beam and the battery cell, so that the longitudinal beam has a side exhaust function, so as to cope with the pressure relief demand of the battery cell explosion-proof valve during thermal runaway, thereby facilitating the improvement of the quality of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a longitudinal beam and a battery pack. Background Technology

[0002] A battery pack is an energy storage unit that integrates multiple individual batteries, a management system (BMS), connecting cables, and a housing. Its core function is to provide stable power to devices and ensure safety. In its specific structure, multiple individual batteries are typically housed within the housing. When there are many individual batteries, longitudinal and transverse beams are usually added inside the housing to improve the overall structural strength and safety. However, the longitudinal beams in traditional battery packs have a relatively simple structural design and a single function, which is not conducive to improving the overall quality of the battery pack. Utility Model Content

[0003] In view of this, this application aims to propose a longitudinal beam that is beneficial to improving the quality of the battery pack.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A longitudinal beam is disposed in the lower box of a battery pack, including a positioning part and a bearing part arranged at intervals above and below, and a support part connecting the positioning part and the bearing part, wherein the positioning part, the support part and the bearing part form an exhaust groove. The bearing part is used to carry the battery cell, the positioning part is used to position the distance between the battery cell and the support part in the width direction of the longitudinal beam, and the exhaust groove is used to guide the thermal runaway gas discharged from the battery cell explosion-proof valve to the battery pack explosion-proof valve.

[0005] Furthermore, the support portion has the exhaust groove on at least one side along the width direction of the longitudinal beam.

[0006] Furthermore, the support portion is provided with exhaust grooves on both sides along the width direction of the longitudinal beam; the bearing portion is hollow and includes a first bottom wall, first side walls on both sides of the first bottom wall along the width direction of the longitudinal beam, and a first top wall on the top of each first side wall; the positioning portion is hollow and includes a second top wall, second side walls on both sides of the second top wall along the width direction of the longitudinal beam, and a second bottom wall at the bottom of each second side wall, with each second bottom wall corresponding to each first top wall; the support portion includes a support wall, and each second bottom wall and its corresponding first top wall are connected by the support wall.

[0007] Furthermore, an arc angle is formed between each of the supporting walls and the corresponding second bottom wall, and / or an arc angle is formed between each of the supporting walls and the corresponding first top wall; the radius R of the arc angle satisfies: 2mm≤R≤5mm.

[0008] Furthermore, in the longitudinal beam height direction, the center distance f between the second top wall and each of the second bottom walls satisfies: f≥2R; and / or, in the longitudinal beam width direction, the center distance e between each of the second side walls and the corresponding support wall satisfies: e≥2R.

[0009] Furthermore, in the longitudinal beam width direction, the center distance g between the two second sidewalls satisfies: g≥4e; and / or, in the longitudinal beam width direction, the center distance h between the two supporting walls satisfies: h≥2e.

[0010] Furthermore, in the longitudinal beam width direction, the center distance 'a' between the two first sidewalls satisfies: 30mm ≤ a ≤ 120mm; and / or, in the longitudinal beam height direction, the center distance 'b' between each first top wall and the first bottom wall satisfies: 15mm ≤ b ≤ 35mm; and / or, in the longitudinal beam width direction, the center distance 'c' between each first sidewall and the corresponding support wall satisfies: 8mm ≤ c ≤ 50mm; and / or, in the longitudinal beam height direction, the center distance 'd' between each second bottom wall and the corresponding first top wall satisfies: 20mm ≤ d ≤ 70mm.

[0011] Furthermore, the support portion has an exhaust groove on one side along the width direction of the longitudinal beam; the bearing portion is hollow and includes a first bottom wall, first side walls on both sides of the first bottom wall along the width direction of the longitudinal beam, and a first top wall on the top of one of the first side walls; the positioning portion is hollow and includes a second top wall, second side walls on both sides of the second top wall along the width direction of the longitudinal beam, and a second bottom wall at the bottom of one of the second side walls, the second bottom wall and the first top wall being disposed on the same side relative to the support portion; the support portion includes a support wall, the second bottom wall and the first top wall are connected by the support wall, and / or, another second side wall and another first side wall are connected by the support wall.

[0012] Furthermore, the positioning part, the bearing part, and the support part are integrally formed.

[0013] Compared with related technologies, this application has the following advantages: (1) The longitudinal beam described in this application is mainly composed of a positioning part, a bearing part and a support part, and is surrounded by an exhaust groove, which can form an exhaust channel between the longitudinal beam and the battery cell, so that the longitudinal beam has a side exhaust function to meet the pressure relief requirements of the battery cell explosion-proof valve during thermal runaway, improve the safety performance of the battery pack, and the positioning part can position the distance between the battery cell and the support part in the width direction of the longitudinal beam, which can ensure the smooth flow of the exhaust channel and ensure that the thermal runaway gas discharged from the battery cell explosion-proof valve is smoothly discharged to the battery pack explosion-proof valve, thereby improving the quality of the battery pack.

[0014] (2) The support has an exhaust groove on at least one side along the width of the longitudinal beam, so that the longitudinal beam can be applied to battery pack scenarios with multiple cell groups or to the side of the cell group, thereby improving the applicability of the longitudinal beam.

[0015] (3) The support part is provided with exhaust grooves on both sides along the width direction of the longitudinal beam, which makes the cross-sectional profile of the longitudinal beam visually "I" shape, so as to have better structural strength. At the same time, the bearing part and the positioning part are hollow, and each second bottom wall and the corresponding first top wall are connected by the support wall, which makes the longitudinal beam hollow as a whole, which can reduce weight and improve the lightweighting of the longitudinal beam.

[0016] (4) A rounded corner is formed between each supporting wall and the corresponding second bottom wall, and a rounded corner is formed between each supporting wall and the corresponding first top wall, and the radius R of the rounded corner satisfies: 2mm≤R≤5mm, which can help reduce the stress at the corner and the risk of cracking failure after welding.

[0017] (5) In the longitudinal beam height direction, the center distance f between the second top wall and each second bottom wall satisfies: f≥2R, and in the longitudinal beam width direction, the center distance e between each second side wall and the corresponding support wall satisfies: e≥2R. This can improve the stiffness and mode of the longitudinal beam and the battery pack as a whole, and avoid the battery pack vibration, impact and large Z-direction displacement during daily use due to low stiffness and mode.

[0018] (6) In the longitudinal beam width direction, the center distance g of the two second side walls satisfies: g≥4e, and in the longitudinal beam width direction, the center distance h of the two support walls satisfies: h≥2e, which can help limit the depth of the exhaust groove and ensure smooth exhaust.

[0019] (7) In the longitudinal beam height direction, the center distance b between each first top wall and the first bottom wall satisfies: 15mm≤b≤35mm, and the center distance d between each second bottom wall and the corresponding first top wall satisfies: 20mm≤d≤70mm. This ensures that the longitudinal beam height is within a reasonable range, avoiding excessive or insufficient longitudinal beam height that could affect the formation of the exhaust groove. Meanwhile, in the longitudinal beam width direction, the center distance a between the two first side walls satisfies: 30mm≤a≤120mm, and the center distance c between each first side wall and the corresponding support wall satisfies: 8mm≤c≤50mm. This ensures that the longitudinal beam width is within a reasonable range, avoiding excessive or insufficient longitudinal beam width that could affect the arrangement and installation of the battery pack.

[0020] (8) The support part is provided with an exhaust groove on one side along the width direction of the longitudinal beam, which makes the cross-sectional profile of the longitudinal beam visually "L" shaped, so as to have better structural strength. At the same time, the bearing part and the positioning part are hollow, and the second bottom wall and the first top wall are connected by a support wall, and the other second side wall and the other first side wall are connected by a support wall, which makes the longitudinal beam hollow as a whole, which can reduce weight and improve the lightweighting of the longitudinal beam.

[0021] (9) The positioning part, bearing part and support part are integrally formed, which can reduce the number of welding positions and welding volume, and is conducive to improving the strength of the longitudinal beam structure.

[0022] This application also proposes a battery pack including the longitudinal beams described above.

[0023] The battery pack described in this application has the aforementioned longitudinal beam, which has the same beneficial effects as conventional technology, and will not be elaborated further here. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure during the assembly of the longitudinal beam and the battery cell assembly as described in the embodiments of this application; Figure 2 This is a schematic diagram of one of the structures of the longitudinal beam described in an embodiment of this application; Figure 3 for Figure 2 Cross-sectional view of the structure shown; Figure 4 This is another structural schematic diagram of the longitudinal beam described in the embodiments of this application; Figure 5 for Figure 4 Cross-sectional view of the structure shown; Explanation of reference numerals in the attached figures: 100. Longitudinal beam; 101. Positioning part; 1011. Second bottom wall; 1012. Second side wall; 1013. Second top wall; 102. Supporting part; 1021. First bottom wall; 1022. First side wall; 1023. First top wall; 103. Support wall; 104. Exhaust groove; 200. Battery cell pack. Detailed Implementation

[0025] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0031] An embodiment of the first aspect of this application provides a longitudinal beam 100 that can improve the quality of a battery pack.

[0032] In related technologies, a battery pack is an energy storage unit that integrates multiple individual batteries, a management system (BMS), connecting cables, and a casing. Its core function is to provide stable power to equipment and ensure safety. In its specific structure, multiple individual batteries are typically housed within the casing. When there are many individual batteries, longitudinal beams 100 and cross beams are usually added inside the casing to improve the overall structural strength and safety. However, the structural design of the longitudinal beams 100 in traditional battery packs is relatively simple and has a single function, which is not conducive to improving the overall quality of the battery pack.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the longitudinal beam 100 in this embodiment combines... Figures 1 to 5 As shown, in terms of overall design, it is located in the lower box of the battery pack and includes a positioning part 101 and a supporting part 102 arranged at intervals between the upper and lower parts, as well as a support part connecting the positioning part 101 and the supporting part 102. An exhaust groove 104 is formed between the positioning part 101, the support part and the supporting part 102.

[0034] The supporting part 102 is used to support the battery cell, the positioning part 101 is used to position the distance between the battery cell and the supporting part in the width direction of the longitudinal beam 100, and the exhaust groove 104 is used to guide the thermal runaway gas discharged from the battery cell explosion-proof valve to the battery pack explosion-proof valve.

[0035] Therefore, the longitudinal beam 100 is mainly composed of a positioning part 101, a bearing part 102, and a support part, and forms an exhaust groove 104. An exhaust channel can be formed between the longitudinal beam 100 and the battery cell, so that the longitudinal beam 100 has a side exhaust function to meet the pressure relief requirements of the battery cell explosion-proof valve in the event of thermal runaway, thereby improving the safety performance of the battery pack. In addition, the positioning part 101 can position the distance between the battery cell and the support part in the width direction of the longitudinal beam 100, which can ensure the smooth flow of the exhaust channel and ensure that the thermal runaway gas discharged from the battery cell explosion-proof valve is smoothly discharged to the battery pack explosion-proof valve, thereby improving the quality of the battery pack.

[0036] Based on the above general introduction, specifically, the battery pack where the longitudinal beam 100 of this embodiment is located typically includes a cell group 200 composed of several stacked cells. There is at least one cell group 200, and the supporting part 102 supports one end of each cell equipped with a cell explosion-proof valve. That is, all cells are depressurized through the venting groove 104. Furthermore, in this embodiment… Figure 1The cell assembly 200 in the figure is for illustrative purposes only. Its specific structure can be referred to as the cell assembly 200 well known to those skilled in the art, which is composed of several cell stacks with cell explosion-proof valves on the sides.

[0037] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment will vary depending on the orientation of the longitudinal beam 100; that is, each direction in this embodiment refers to a relative coordinate system with the longitudinal beam 100 as the reference.

[0038] In some exemplary embodiments, the support portion has an exhaust groove 104 on at least one side along the width direction of the longitudinal beam 100. This configuration allows the longitudinal beam 100 to be applied to battery pack scenarios with multiple cell groups 200, or to the side of the cell group 200, thereby expanding the applicability of the longitudinal beam 100.

[0039] In specific implementation, we will continue to combine Figure 2 and Figure 3 As shown, in some exemplary embodiments, the support portion has exhaust grooves 104 on both sides along the width direction of the longitudinal beam 100. The bearing portion 102 is hollow and includes a first bottom wall 1021, first side walls 1022 on both sides of the first bottom wall 1021 along the width direction of the longitudinal beam 100, and a first top wall 1023 on the top of each first side wall 1022.

[0040] Meanwhile, the positioning part 101 is hollow and includes a second top wall 1013, second side walls 1012 disposed on both sides of the second top wall 1013 along the width direction of the longitudinal beam 100, and a second bottom wall 1011 disposed at the bottom of each second side wall 1012. Each second bottom wall 1011 is correspondingly disposed to each first top wall 1023. The support part includes a support wall 103, and each second bottom wall 1011 and its corresponding first top wall 1023 are connected by the support wall 103.

[0041] Thus, a cavity is formed between the first bottom wall 1021, the second top wall 1013, each first top wall 1023, each second bottom wall 1011, each first side wall 1022, each second side wall 1012 and each support wall 103, and each exhaust groove 104 is formed in the area enclosed by the first top wall 1023, the second bottom wall 1011 and the support wall 103 on the same side.

[0042] It is understandable that the support part is provided with exhaust grooves 104 on both sides along the width direction of the longitudinal beam 100, which makes the cross-sectional outline of the longitudinal beam 100 visually "I" shaped. The longitudinal beam 100 has a symmetrical structural design to have better structural strength. At the same time, the bearing part 102 and the positioning part 101 are hollow, and each second bottom wall 1011 and the corresponding first top wall 1023 are connected by a support wall 103, which makes the longitudinal beam 100 hollow as a whole, reducing weight and improving the lightweighting of the longitudinal beam 100.

[0043] In specific implementation, we will continue to combine Figure 2 and Figure 3 As shown, in some exemplary embodiments, an arc angle is formed between each support wall 103 and the corresponding second bottom wall 1011, and an arc angle is also formed between each support wall 103 and the corresponding first top wall 1023. Specifically, the radius R of the arc angle satisfies: 2mm≤R≤5mm.

[0044] Here, an arc angle is formed between each support wall 103 and the corresponding second bottom wall 1011, and an arc angle is formed between each support wall 103 and the corresponding first top wall 1023. The radius R of the arc angle satisfies: 2mm≤R≤5mm, which can help reduce the stress at the corner and the risk of cracking failure after welding.

[0045] The specific value of the arc angle in this embodiment can be set and adjusted according to the stress reduction requirements or the control of failure risk. For example, R can be specifically set to 2mm, 3mm, 4mm or 5mm. Of course, if necessary, an arc angle can also be formed only between each support wall 103 and the corresponding second bottom wall 1011, or only between each support wall 103 and the corresponding first top wall 1023, to meet the design requirements of longitudinal beams 100 with different performance.

[0046] Furthermore, in some exemplary embodiments, the center-to-center distance f between the second top wall 1013 and each of the second bottom walls 1011 in the height direction of the longitudinal beam 100 satisfies: f≥2R, and the center-to-center distance e between each of the second side walls 1012 and the corresponding support wall 103 in the width direction of the longitudinal beam 100 satisfies: e≥2R.

[0047] By setting the range of values ​​for center spacing f and center spacing e, the stiffness and modal characteristics of the longitudinal beam 100 and the battery pack as a whole can be improved, avoiding vibration and impact of the battery pack due to low stiffness and modal characteristics, as well as large Z-direction displacement during daily use. It can also reduce the stress on the longitudinal beam 100 itself.

[0048] Furthermore, continue to combine Figure 2 and Figure 3 As shown, in some exemplary embodiments, the center-to-center distance g of the two second sidewalls 1012 in the width direction of the longitudinal beam 100 satisfies: g ≥ 4e, and the center-to-center distance h of the two supporting walls 103 satisfies: h ≥ 2e. The main advantage of this arrangement is that it helps to limit the depth of the venting groove 104, ensuring smooth venting. At the same time, it also ensures that the overall structural performance of the longitudinal beam 100 is not affected, meeting the support requirements of the entire package and the battery cell assembly 200.

[0049] Continue to combine Figure 2 and Figure 3 As shown, in some exemplary embodiments, the center-to-center distance *a* between the two first sidewalls 1022 in the width direction of the longitudinal beam 100 satisfies: 30mm ≤ *a* ≤ 120mm, and the center-to-center distance *c* between each first sidewall 1022 and its corresponding support wall 103 satisfies: 8mm ≤ *c* ≤ 50mm. This arrangement ensures that the width of the longitudinal beam 100 is within a reasonable range, preventing the width of the longitudinal beam 100 from being too large or too small, which could affect the arrangement and installation of the battery cell assembly 200.

[0050] Meanwhile, along the height of the longitudinal beam 100, the center-to-center distance *b* between each first top wall 1023 and first bottom wall 1021 satisfies: 15mm ≤ *b* ≤ 35mm, and the center-to-center distance *d* between each second bottom wall 1011 and its corresponding first top wall 1023 satisfies: 20mm ≤ *d* ≤ 70mm. This ensures that the height of the longitudinal beam 100 is within a reasonable range, preventing the formation of the exhaust duct 104 from being affected by excessively large or small heights.

[0051] It is worth mentioning that, in this embodiment, the center-to-center distance is actually the distance between the two corresponding components on the same side. Therefore, in this embodiment... Figure 3 In the above-mentioned center spacing a, center spacing b, center spacing c, center spacing d, center spacing e and center spacing f are all the same side spacing of the two corresponding components. For example, center spacing f is the distance between the top surface of the second top wall 1013 and the top surface of the second bottom wall 1011.

[0052] Of course, the values ​​of the above center spacings can be set and adjusted according to the actual structural design requirements of the longitudinal beam 100, as long as they meet the support, limiting and venting requirements of the cell group 200 in the battery pack. For example, the center spacing a can be specifically 30mm, 70mm, 100mm or 120mm, the center spacing b can be specifically 15mm, 20mm, 30mm or 35mm, the center spacing c can be specifically 8mm, 20mm, 35mm or 50mm, the center spacing d can be specifically 20mm, 30mm, 50mm or 70mm, the center spacing e can be specifically 4mm, 7mm or 10mm, the center spacing f can be specifically 4mm, 7mm or 10mm, the center spacing g can be specifically 16mm, 30mm or 40mm, and the center spacing h can be specifically 8mm, 15mm or 20mm.

[0053] It is understandable that the above-mentioned "I"-shaped longitudinal beam 100 is particularly suitable for the middle longitudinal beam 100, that is, it is used in a battery pack with at least two cell groups 200. Taking a battery pack with two cell groups 200 as an example, the longitudinal beam 100 is located in the middle of the two cell groups 200, and the first top wall 1023 on both sides of it supports the two cell groups 200 respectively.

[0054] In addition, the longitudinal beam 100 of this embodiment, besides being used as an intermediate longitudinal beam 100 between two adjacent cell groups 200, can also serve as a side longitudinal beam 100 to support the side of the cell group 200. Specifically, continuing with... Figure 1 , Figure 4 and Figure 5 As shown, in some exemplary embodiments, the support has an exhaust groove 104 on one side along the width direction of the longitudinal beam 100. Because in Figure 1 In the state shown, the structures of the left side longitudinal beam 100 and the right side longitudinal beam 100 are basically the same and can be regarded as mirror images of each other. Therefore, the left side longitudinal beam 100 will be used as an example for introduction, and will not be described in detail below.

[0055] The supporting part 102 is hollow and includes a first bottom wall 1021, first side walls 1022 on both sides of the first bottom wall 1021 along the width direction of the longitudinal beam 100, and a first top wall 1023 on top of one of the first side walls 1022. The positioning part 101 is hollow and includes a second top wall 1013, second side walls 1012 on both sides of the second top wall 1013 along the width direction of the longitudinal beam 100, and a second bottom wall 1011 at the bottom of one of the second side walls 1012. The second bottom wall 1011 and the first top wall 1023 are arranged on the same side relative to the supporting part.

[0056] Furthermore, the support includes a support wall 103, a second bottom wall 1011 and a first top wall 1023 connected by the support wall 103, and another second side wall 1012 and another first side wall 1022 connected by the support wall 103.

[0057] Thus, a cavity is formed between the first bottom wall 1021, the first top wall 1023, the second top wall 1013, the second bottom wall 1011, each of the first side walls 1022, each of the second side walls 1012 and each of the support walls 103, and the exhaust groove 104 is formed in the area enclosed by the first top wall 1023, the second bottom wall 1011 and the support wall 103 on the same side.

[0058] It is understandable that the support part is provided with an exhaust groove 104 on one side along the width direction of the longitudinal beam 100, which makes the cross-sectional profile of the longitudinal beam 100 visually "L" shaped, so as to have better structural strength and ensure its support and load-bearing capacity. At the same time, the support part 102 and the positioning part 101 are hollow, and the second bottom wall 1011 and the first top wall 1023 are connected by a support wall 103. The other second side wall 1012 and the other first side wall 1022 are connected by a support wall 103, which makes the longitudinal beam 100 hollow as a whole, reducing weight and improving the lightweighting of the longitudinal beam 100.

[0059] It should be mentioned that the specific dimensions of the left side longitudinal beam 100 can refer to the dimensions of the longitudinal beam 100 used between two adjacent battery cell groups 200. It is only necessary to ensure the side support requirements of the battery cell group 200 and the overall structural strength requirements, which will not be elaborated here.

[0060] Furthermore, in some exemplary embodiments, the positioning part 101, the bearing part 102, and the support part are integrally formed, for example, by integral roll forming. This reduces the number of welding positions and the amount of welding, thus improving the structural strength of the longitudinal beam 100.

[0061] It is worth noting that, regarding the longitudinal beam 100 in this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made of... Figures 1 to 5 As shown, it is located in the lower casing of the battery pack and may include, for example, a positioning part 101 and a supporting part 102 arranged at intervals, and a support part connecting the positioning part 101 and the supporting part 102. An exhaust groove 104 is formed between the positioning part 101, the support part and the supporting part 102.

[0062] The supporting part 102 is used to support the battery cell, the positioning part 101 is used to position the distance between the battery cell and the supporting part in the width direction of the longitudinal beam 100, and the exhaust groove 104 is used to guide the thermal runaway gas discharged from the battery cell explosion-proof valve to the battery pack explosion-proof valve.

[0063] The support portion has exhaust grooves 104 on both sides along the width of the longitudinal beam 100; the bearing portion 102 is hollow and includes a first bottom wall 1021, first side walls 1022 on both sides of the first bottom wall 1021 along the width of the longitudinal beam 100, and a first top wall 1023 on the top of each first side wall 1022; the positioning portion 101 is hollow and includes a second top wall 1013, second side walls 1012 on both sides of the second top wall 1013 along the width of the longitudinal beam 100, and a second bottom wall 1011 at the bottom of each second side wall 1012, with each second bottom wall 1011 corresponding to each first top wall 1023; the support portion includes a support wall 103, and each second bottom wall 1011 and its corresponding first top wall 1023 are connected by the support wall 103.

[0064] Among them, each support wall 103 and the corresponding second bottom wall 1011 form an arc angle, and each support wall 103 and the corresponding first top wall 1023 form an arc angle, and the radius R of the arc angle satisfies: 2mm≤R≤5mm.

[0065] Specifically, in the height direction of the longitudinal beam 100, the center distance f between the second top wall 1013 and each of the second bottom walls 1011 satisfies: f≥2r; in the width direction of the longitudinal beam 100, the center distance e between each of the second side walls 1012 and the corresponding support wall 103 satisfies: e≥2R; in the width direction of the longitudinal beam 100, the center distance g between the two second side walls 1012 satisfies: g≥4e; in the width direction of the longitudinal beam 100, the center distance h between the two support walls 103 satisfies: h≥2e.

[0066] In the width direction of the longitudinal beam 100, the center distance a between the two first side walls 1022 satisfies: 30mm≤a≤120mm, and the center distance c between each first side wall 1022 and its corresponding support wall 103 satisfies: 8mm≤c≤50mm. Meanwhile, in the height direction of the longitudinal beam 100, the center distance b between each first top wall 1023 and the first bottom wall 1021 satisfies: 15mm≤b≤35mm, and the center distance d between each second bottom wall 1011 and its corresponding first top wall 1023 satisfies: 20mm≤d≤70mm.

[0067] The positioning part 101, the bearing part 102, and the support part are integrally formed.

[0068] In the preferred embodiment of the longitudinal beam 100 above, the specific setting and arrangement of the positioning part 101, the bearing part 102, the support part, etc. can still be referred to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the positioning part 101, the bearing part 102, and the support part, etc., can also be referred to the description in the above exemplary embodiments.

[0069] The longitudinal beam 100 of this embodiment adopts the above design, forming an exhaust channel between the longitudinal beam 100 and the battery cell, so that the longitudinal beam 100 has a side exhaust function to meet the pressure relief requirements of the battery cell explosion-proof valve in the event of thermal runaway, thereby improving the safety performance of the battery pack. In addition, the positioning part 101 can position the distance between the battery cell and the support part in the width direction of the longitudinal beam 100, which can ensure the smooth flow of the exhaust channel and ensure that the thermal runaway gas discharged from the battery cell explosion-proof valve is smoothly discharged to the battery pack explosion-proof valve, thereby improving the quality of the battery pack.

[0070] An embodiment of the second aspect of this application provides a battery pack that includes the longitudinal beam 100 in the embodiment of the first aspect.

[0071] The battery pack of this embodiment can improve the overall safety performance by setting the longitudinal beam 100 in the first aspect embodiment.

[0072] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A longitudinal beam, disposed within the lower housing of a battery pack, characterized in that: It includes a positioning part and a bearing part arranged at intervals, and a support part connecting the positioning part and the bearing part, wherein the positioning part, the support part and the bearing part form an exhaust groove. The bearing part is used to carry the battery cell, the positioning part is used to position the distance between the battery cell and the support part in the width direction of the longitudinal beam, and the exhaust groove is used to guide the thermal runaway gas discharged from the battery cell explosion-proof valve to the battery pack explosion-proof valve.

2. The longitudinal beam according to claim 1, characterized in that: The support portion is provided with the exhaust groove on at least one side along the width direction of the longitudinal beam.

3. The longitudinal beam according to claim 2, characterized in that: The support portion is provided with exhaust grooves on both sides along the width direction of the longitudinal beam; The supporting part is hollow and includes a first bottom wall, first side walls on both sides of the first bottom wall along the width direction of the longitudinal beam, and a first top wall on the top of each of the first side walls. The positioning part is hollow and includes a second top wall, second side walls on both sides of the second top wall along the width direction of the longitudinal beam, and a second bottom wall at the bottom of each second side wall. Each second bottom wall corresponds to each first top wall. The support includes a support wall, and each of the second bottom walls and the corresponding first top wall are connected by the support wall.

4. The longitudinal beam according to claim 3, characterized in that: An arc angle is formed between each of the supporting walls and the corresponding second bottom wall, and / or an arc angle is formed between each of the supporting walls and the corresponding first top wall; The radius R of the arc angle satisfies: 2mm≤R≤5mm.

5. The longitudinal beam according to claim 4, characterized in that: In the direction of the longitudinal beam height, the center distance f between the second top wall and each of the second bottom walls satisfies: f ≥ 2R; and / or, In the width direction of the longitudinal beam, the center distance e between each second sidewall and the corresponding support wall satisfies: e≥2R.

6. The longitudinal beam according to claim 5, characterized in that: In the width direction of the longitudinal beam, the center-to-center distance g between the two second sidewalls satisfies: g ≥ 4e; and / or, In the width direction of the longitudinal beam, the center distance h between the two supporting walls satisfies: h≥2e.

7. The longitudinal beam according to claim 3, characterized in that: In the width direction of the longitudinal beam, the center distance 'a' between the two first sidewalls satisfies: 30mm ≤ a ≤ 120mm; and / or, In the direction of the longitudinal beam height, the center distance b between each of the first top wall and the first bottom wall satisfies: 15mm ≤ b ≤ 35mm; and / or, In the width direction of the longitudinal beam, the center distance c between each of the first sidewalls and the corresponding support wall satisfies: 8mm ≤ c ≤ 50mm; and / or, In the longitudinal beam height direction, the center distance d between each second bottom wall and the corresponding first top wall satisfies: 20mm≤d≤70mm.

8. The longitudinal beam according to claim 2, characterized in that: The support portion is provided with the exhaust groove on one side along the width direction of the longitudinal beam; The supporting part is hollow and includes a first bottom wall, first side walls on both sides of the first bottom wall along the width direction of the longitudinal beam, and a first top wall on the top of one of the first side walls. The positioning part is hollow and includes a second top wall, second side walls on both sides of the second top wall along the width direction of the longitudinal beam, and a second bottom wall at the bottom of one of the second side walls. The second bottom wall and the first top wall are disposed on the same side relative to the support part. The support includes a support wall, through which the second bottom wall and the first top wall are connected, and / or, through which another second side wall and another first side wall are connected.

9. The longitudinal beam according to any one of claims 1 to 8, characterized in that: The positioning part, the bearing part, and the support part are integrally formed.

10. A battery pack, characterized in that: The longitudinal beam includes any one of claims 1 to 9.

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