Battery pack and powered device

Abstract

A battery pack and an electric device are provided. The battery pack comprises a box body and a battery. The box body comprises a plurality of side beams and a bottom assembly, the plurality of side beams and the bottom assembly enclose a box space, and the bottom assembly comprises a bottom plate and a bottom guard plate, the bottom plate is located above the bottom guard plate and is spaced from the bottom guard plate to form a bottom space. The battery is placed in the box space and supported on the bottom plate. The bottom of the battery is provided with an explosion-proof valve, and the bottom guard plate is provided with an exhaust valve. When the explosion-proof valve is opened, the spatter of the battery is sequentially discharged through the through hole on the bottom plate, the bottom space and the exhaust valve. The plurality of side beams comprises a first side beam extending in a first direction, the size of the bottom guard plate in a second direction is L1, the distance from the exhaust valve to the first side beam in the second direction is L2, the first direction, the second direction and the height direction are perpendicular to each other, and 0.033≤L2 / L1≤0.99. The setting range of the exhaust valve takes into account the connection strength of the side beam and the bottom guard plate, and ensures that the bottom guard plate provides impact protection for the battery.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and in particular, to a battery pack and an electrical device having the battery pack. Background Technology

[0002] The battery pack's casing, enclosed by side beams and a bottom protective plate, forms a sealed cavity to house the batteries. In the event of battery thermal runaway, high-temperature gases and ejected materials are released through an explosion-proof valve at the bottom of the battery, entering the bottom space beneath the battery and spreading laterally along this space. Upon reaching critical pressure, they are discharged outside the battery pack through vent valves located on the side beams. However, this venting path suffers from a circuitous gas flow path, and the gas is prone to forming localized eddies or stagnation in the bottom space, reducing the battery pack's venting efficiency. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to solve the technical problem that the gas flow path is circuitous and easily forms local eddies or stagnation in the bottom space.

[0004] The battery pack includes a housing and batteries. The housing includes multiple side beams and a bottom assembly, which enclose an internal space. The bottom assembly includes a bottom plate and a bottom protective plate. The bottom plate is located above the bottom protective plate and is spaced apart from it to form a bottom space. The batteries are placed in the internal space and supported on the bottom plate. The bottom of the batteries is equipped with an explosion-proof valve, and the bottom protective plate is equipped with an exhaust valve. When the explosion-proof valve is opened, the battery ejection material is discharged sequentially through a through hole in the bottom plate, the bottom space, and the exhaust valve. The multiple side beams include a first side beam extending along a first direction. The bottom protective plate has a dimension L1 in a second direction. The distance from the exhaust valve to the first side beam in the second direction is L2. The first direction, the second direction, and the height direction are mutually perpendicular, and 0.033≤L2 / L1≤0.99.

[0005] According to the above structure, in the event of battery thermal runaway, high-temperature gases and ejected materials are released from the explosion-proof valve at the bottom of the battery, enter the bottom space through the through-hole in the bottom plate, and are discharged outside the housing via the exhaust valve on the bottom guard plate, forming a shorter exhaust path and effectively reducing airflow vortex and pressure retention. The dimension L1 of the bottom guard plate in the second direction, i.e., the length of the bottom guard plate, satisfies the proportional relationship of 0.033≤L2 / L1≤0.99 with the distance L2 from the exhaust valve to the first side beam. If the exhaust valve is too close to the first side beam, i.e., L2 is too small, it will weaken the local strength of the bottom guard plate in the corner area. Considering that installing an exhaust valve on the bottom guard plate will weaken the strength and rigidity of the bottom guard plate, especially in the area around the exhaust valve, if the exhaust valve is too far from the side beam, i.e., L2 is too large, the area around the exhaust valve will receive less support from the side beam when subjected to external impact, leading to increased local deformation, and thus transferring the impact load more directly to the vehicle floor and battery system, reducing the overall protection performance of the battery. In other words, being too far away will weaken the protection of the battery. 0.033≤L2 / L1≤0.99, this range will have both greater connection strength between the side beams and the bottom guard plate, and ensure that the bottom guard plate provides sufficient impact protection for the battery.

[0006] This disclosure also provides an electrical device. The electrical device includes the aforementioned battery pack. Attached Figure Description

[0007] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0009] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0010] Figure 1 This is a schematic diagram of the structure of a battery pack housing according to an embodiment of the present disclosure.

[0011] Figure 2 For the battery pack edge Figure 1 A schematic cross-sectional view taken along line AA.

[0012] Figure 3 This is a schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0013] Figure 4 This is a schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0014] Figure 5 For the battery pack edge Figure 1 A schematic cross-sectional view taken along line BB.

[0015] Figure 6 for Figure 2 A magnified view of part C in the middle.

[0016] Figure 7 for Figure 6 A schematic diagram showing the structure where the valve plate and valve seat are completely separated.

[0017] Figure 8 for Figure 6 A schematic diagram of the structure in which the valve plate and valve seat are separated on one side.

[0018] Figure 9 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100—Battery pack; 10—Box body; 11—Side beam; 111—First side beam; 112—Second side beam; 12—Bottom guard plate; 121—Exhaust valve; 1211—Valve seat; 1212—Valve plate; 1213—Exhaust passage; 1214—Elastic element; 122—First part; 123—Second part; 124a—First reinforcing structure; 124b—Second reinforcing structure; 13—Bottom plate; 131—Through hole; 14—Separation beam; 20—Bottom assembly; 30—Battery; 31—Explosion-proof valve; 40—Internal space; 41—Bottom space; 42—Battery compartment; 43—Electrical compartment; 50—Box top cover; 60—Battery management system; 200—Electrical equipment. Detailed Implementation

[0021] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0022] <Example Battery Pack>

[0023] To reduce localized gas eddies or stagnation and improve the exhaust efficiency of the battery pack, this disclosure provides a battery pack 100 according to one embodiment. (Reference) Figure 1 and Figure 2The battery pack 100 may include a housing 10, batteries 30, a housing top cover 50, and a battery management system 60, with multiple batteries 30 electrically connected to each other. The housing 10 houses the batteries 30 and the battery management system 60. The batteries 30 are electrically connected to the battery management system 60, enabling the charging and discharging process of multiple batteries 30. The housing 10 and the housing top cover 50 serve as external protective structures, typically made of metal or composite materials, and are waterproof, dustproof, and impact-resistant, providing a safe operating environment for the internal components such as the batteries 30 and the battery management system 60.

[0024] The battery pack 100 may also include a battery group composed of multiple batteries 30 connected in series and parallel, and integrate a battery management system 60 (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within the receiving cavity of the housing 10 and sealed by the housing top cover 50, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a power source for new energy vehicles, with the rechargeable battery 30 primarily used for storing and providing electrical energy.

[0025] refer to Figure 1 and Figure 2 The box body 10 includes a plurality of side beams 11 and a bottom assembly 20, which enclose an internal space 40. The bottom assembly 20 includes a bottom plate 13 and a bottom guard plate 12. The bottom plate 13 is located above the bottom guard plate 12 and is spaced apart from the bottom guard plate 12 to form a bottom space 41. The battery 30 is placed in the internal space 40 and supported on the base plate 13. The bottom of the battery 30 is equipped with an explosion-proof valve 31, and the bottom protective plate 12 is equipped with an exhaust valve 121. When the explosion-proof valve 31 is opened, the ejected material from the battery 30 is discharged sequentially through the through hole 131 on the base plate 13, the bottom space 41, and the exhaust valve 121. Multiple side beams 11 include a first side beam 111 extending along a first direction. The dimension of the bottom protective plate 12 in the second direction is L1 (in mm). The distance from the exhaust valve 121 to the first side beam 111 in the second direction is L2 (in mm). The first direction, the second direction, and the height direction are mutually perpendicular, and 0.033 ≤ L2 / L1 ≤ 0.99. Preferably, the ratio L2 / L1 can range from 0.04 to 0.9. More preferably, the ratio L2 / L1 can range from 0.1 to 0.8. Alternatively, the ratio L2 / L1 can also be 0.2, 0.4, 0.6, and 0.7.

[0026] According to the above structure, when the battery 30 experiences thermal runaway, the high-temperature gas and ejected material are released from the explosion-proof valve 31 at the bottom of the battery 30, enter the bottom space 41 through the through hole 131 on the bottom plate 13, and are discharged outside the housing 10 through the exhaust valve 121 on the bottom protective plate 12, forming a shorter exhaust path and effectively reducing airflow vortex and pressure retention. The bottom plate 13 is set in the housing space 40, maintaining a certain distance from the bottom protective plate 12 to form a bottom exhaust channel 1213. The bottom plate 13 can be a liquid cooling plate, placed at the bottom of the battery 30, providing a support platform for the battery 30 while effectively absorbing the heat generated by the battery 30 through the circulation of coolant in the internal flow channel. The through hole 131 on the bottom plate 13 can be a pre-fabricated through hole. In another embodiment, the through hole 131 can also be a weak point, remaining sealed under normal conditions. When the battery 30 experiences thermal runaway, it ruptures under the impact of the high-temperature ejected material to form the through hole 131, guiding the high-temperature ejected material into the bottom space 41. The dimension L1 of the bottom guard plate 12 in the second direction, i.e., the length of the bottom guard plate 12, satisfies the proportional relationship of 0.033 ≤ L2 / L1 ≤ 0.99 with respect to the distance L1 from the exhaust valve 121 to the first side beam 111. If the exhaust valve 121 is too close to the first side beam 111, i.e., L2 is too small, the local strength of the bottom guard plate 12 in the corner area will be weakened, affecting the overall impact resistance. If the exhaust valve 121 is too far from the first side beam 111, i.e., L2 is too large, the bottom guard plate 12 cannot effectively share the supporting load of the first side beam 111, resulting in stress concentration at the exhaust valve 121. By limiting the distance from the exhaust valve 121 to the first side beam 111, the rigidity of the bottom guard plate 12 itself can be ensured, and it can form a cooperative force-bearing structure with the first side beam 111, improving the overall bending and torsional resistance of the box 10. This disclosure does not specifically limit the range of L1 and L2. For example, L1 can be 1500mm, 1800mm, 2100mm, 2400mm or 2700mm. For example, L2 can be 200mm, 600mm, 1000mm, 1400mm or 1800mm.

[0027] For ease of description, in the accompanying drawings of this disclosure, arrows X+ and X- respectively indicate opposite sides in a first direction, arrows Y+ and Y- respectively indicate opposite sides in a second direction, and arrows Z+ and Z- respectively indicate opposite sides in a height direction.

[0028] refer to Figure 1The first direction can be the lateral direction of the battery pack 100. That is, the first side beam 111 extending along the first direction can be a crossbeam, and the second side beam 112 extending along the second direction can be a longitudinal beam. The size of the first side beam 111 is smaller than the size of the second side beam 112. The crossbeam has a smaller sway amplitude when subjected to external impact. The distance between the exhaust valve 121 and the first side beam 111 satisfies the ratio 0.033≤L2 / L1≤0.99, which can help the bottom guard plate 12 provide better impact resistance in the part near the exhaust valve 121.

[0029] The internal space 40 is divided into a battery compartment 42 and an electrical compartment 43. Batteries 30 are placed inside the battery compartment 42, and an exhaust valve 121 is located below the electrical compartment 43. In the event of thermal runaway of one of the batteries 30 in the battery compartment 42, the high-temperature ejected material enters the bottom space 41 through the through-hole 131 and is then guided to exit through the exhaust valve 121 below the electrical compartment 43. This effectively isolates the ejected material from contact with other batteries 30 within the battery compartment 42, preventing the risk of secondary heat spread. Simultaneously, the electrical components arranged in the electrical compartment 43 are relatively heat-resistant and have better resistance to thermal and mechanical shocks compared to the battery compartment 42. Even if the exhaust valve 121 is damaged in extreme circumstances, the damage is limited to the bottom space 41 below the electrical compartment 43 and will not affect the structural integrity of the battery compartment 42, meaning that the battery will not be damaged, or will be minimally damaged. The base plate 13 may be located only below the battery compartment 42 and be a liquid-cooled plate structure. In another embodiment, the base plate 13 may also be a segmented structure, composed of plates of different materials spliced ​​together. The base plate 13 with cooling channels is located below the battery compartment 42, and the base plate 13 below the electrical compartment 43 is made of other suitable materials, such as composite materials or engineering plastics.

[0030] The enclosure 10 also includes a partition beam 14 extending along a first direction, which divides the internal space 40 into a battery compartment 42 and an electrical compartment 43. An exhaust valve 121 is located in a second direction between the first side beam 111 and the partition beam 14. The partition beam 14 can establish physical isolation between the battery compartment 42 and the electrical compartment 43, preventing high-temperature substances in the battery compartment 42 from directly spreading to the electrical compartment 43 in the event of thermal runaway. Furthermore, the area between the first side beam 111 and the partition beam 14 has good bending and torsional resistance, and the location of the exhaust valve 121 in this area can reduce the impact of the exhaust valve 121 on the overall structural strength of the bottom protective plate 12.

[0031] refer to Figure 3The bottom protective plate 12 includes a first part 122 and a second part 123. The first part 122 is located below the battery compartment 42, and the second part 123 is located below the electrical compartment 43. The distance between the first part 122 and the bottom plate 13 is greater than the distance between the second part 123 and the bottom plate 13. For example, the bottom protective plate 12 can transition from the first part 122 to the second part 123 in a stepped manner. The bottom space 41 below the electrical compartment 43 does not directly bear the impact during thermal runaway. A smaller spacing is sufficient to meet the structural support requirements of the enclosure 10. At the same time, the smaller spacing of the bottom space 41 below the electrical compartment 43 saves internal space 40.

[0032] refer to Figure 4 The bottom protective plate 12 may be provided with two reinforcing structures 124a and 124b, namely a first reinforcing structure 124a and a second reinforcing structure 124b, each of which protrudes to one side. The distance between the two reinforcing structures 124a and 124b can be L3, in mm. Here, 0.033 ≤ L3 / L1 ≤ 0.5. Preferably, the ratio L3 / L1 can range from 0.04 to 0.4. More preferably, the ratio L3 / L1 can range from 0.05 to 0.35. Alternatively, the ratio L3 / L1 can also be 0.1, 0.15, 0.2, 0.25, and 0.3. Providing two raised reinforcing structures 124a and 124b on the bottom protective plate 12 can optimize the mechanical properties of the bottom protective plate 12. When the spacing is too small, it will lead to material accumulation and increased weight. When the spacing is too large, it is difficult to effectively suppress the deformation of the bottom protective plate 12 in the central region away from the two first side beams 111, thus reducing the overall bending resistance of the bottom protective plate 12. The center-to-center spacing of the two reinforcing structures 124a and 124b satisfies the above-mentioned proportional relationship, which can effectively suppress the deformation of the bottom protective plate 12 and enhance the structural strength while reducing weight. In one example, the raised bending deformation can be formed on the bottom protective plate 12 by stamping, and these raised bending deformations are the two reinforcing structures 124a and 124b. This disclosure does not particularly limit the range of L3. For example, L3 can be 200mm, 250mm, 300mm, 350mm or 400mm.

[0033] refer to Figure 4 and Figure 5 Each of the two reinforcing structures 124a and 124b can extend along a first direction, that is, parallel to the first side beam 111, to resist longitudinal bending loads. Each of the two reinforcing structures 124a and 124b can be a regularly shaped bulge or an irregularly shaped bulge, such as a strip-shaped bulge or an "X"-shaped bulge.

[0034] In other embodiments, each of the two reinforcing structures 124a, 124b may extend in a second direction, i.e., parallel to the second side beam 112, to resist lateral bending loads.

[0035] Continue to refer to Figure 4 The exhaust valve 121 can be located between two reinforcing structures 124a and 124b. Through the coordinated support of the two adjacent reinforcing structures 124a and 124b, enhanced local rigidity is provided to the installation area of ​​the exhaust valve 121, improving the deformation resistance of this area and preventing structural weakening caused by the installation of the exhaust valve 121. Under the condition of thermal runaway of the battery 30, it can effectively resist the impact of high-pressure gas, prevent local deformation failure of the bottom protective plate 12, and ensure the structural stability of the exhaust channel 1213.

[0036] refer to Figure 1 and Figure 5 The plurality of side beams 11 also includes a second side beam 112, which is a longitudinal beam. The bottom guard plate 12 has a dimension L4 in the first direction, in mm, i.e., the width of the bottom guard plate 12. The distance from the exhaust valve 121 to the second side beam 112 in the first direction is L5, in mm. Here, 0.05 ≤ L5 / L4 ≤ 0.99. Preferably, the ratio L5 / L4 can be in the range of 0.1 to 0.9. More preferably, the ratio L5 / L4 can be in the range of 0.2 to 0.8. Alternatively, the ratio L5 / L4 can also be 0.3, 0.4, 0.5, 0.6, and 0.7. If the exhaust valve 121 is too close to the second side beam 112, i.e., L5 is too small, it will weaken the local strength of the bottom guard plate 12 in the corner area, affecting the overall impact resistance. If the distance between the exhaust valve 121 and the second side beam 112 is too far, i.e., L5 is too large, the bottom guard plate 12 cannot effectively share the supporting load of the second side beam 112, resulting in stress concentration at the exhaust valve 121. Based on the above proportions, the distance between the exhaust valve 121 and the second side beam 112 is limited, so that the exhaust valve 121 is located in an area of ​​better rigidity of the bottom guard plate 12. This disclosure does not particularly limit the range of L4 and L5. For example, L4 can be 1200mm, 1400mm, 1600mm, or 1800mm. For example, L5 can be 200mm, 500mm, 800mm, 1100mm, or 1400mm.

[0037] refer to Figure 6The exhaust valve 121 includes a valve seat 1211 and a valve plate 1212. The valve seat 1211 is fixed to the bottom protective plate 12 and has a through exhaust channel 1213. The valve plate 1212 closes the exhaust channel 1213. The valve seat 1211 can be fixed to a preset position on the bottom protective plate 12 by welding or bolting. The valve plate 1212 can be made of a high-temperature resistant alloy sheet. The valve seat 1211 and the valve plate 1212 form a detachable connection. Under normal working conditions, the two fit tightly together to form a sealed space.

[0038] refer to Figure 7 The valve plate 1212 is engaged with the valve seat 1211, allowing the valve plate 1212 to separate from the valve seat 1211 upon impact by ejected material, thereby opening the exhaust passage 1213. In other words, when thermal runaway occurs in the battery 30, causing the pressure within the bottom space 41 to reach a critical value, the impact force generated by the high-pressure gas overcomes the holding force of the engagement structure, pushing the valve plate 1212 completely away from the valve seat 1211, forming a through exhaust passage 1213, and discharging gas outside the housing 10, providing a large gas flow area. In another embodiment, the exhaust valve 121 can be a pre-designed weak point; when the pressure within the bottom space 41 reaches a critical value, the gas breaks through the pre-designed weak point to form the exhaust passage 1213.

[0039] Back Figure 1 At least one exhaust valve 121 may be provided on the bottom protective plate 12. The area of ​​the bottom protective plate 12 is S1, in mm. 2 The sum of the areas of at least one exhaust valve 121 is S2, in mm. 2 Here, 0.000004 ≤ S2 / S1 ≤ 0.0314. Preferably, the ratio S2 / S1 can range from 0.0001 to 0.03. More preferably, the ratio S2 / S1 can range from 0.001 to 0.02. Alternatively, the ratio S2 / S1 can also be 0.002, 0.007, 0.012, and 0.017. According to the above proportional relationship, it is ensured that the exhaust valve 121 can provide sufficient exhaust channel area in the event of thermal runaway, while avoiding a significant reduction in the strength of the bottom guard plate 12 due to excessive openings. This disclosure does not particularly limit the range of S1 and S2. For example, S1 can be 1000000 mm. 2 3,000,000 mm 2 5,000,000 mm 2 Or 7,000,000 mm 2 For example, S2 can be 100mm. 2 500mm 2 1000mm 2 Or 5000mm 2 .

[0040] refer to Figure 8The exhaust valve 121 may include a valve seat 1211, a valve plate 1212, and an elastic element 1214. The valve seat 1211 is fixed to the bottom protective plate 12 and has a through exhaust passage 1213. The elastic element 1214 holds the valve plate 1212 in a position where the exhaust passage 1213 is closed. When the valve plate 1212 is impacted by the ejected material, it can overcome the elastic force of the elastic element 1214 and open the exhaust passage 1213. The valve seat 1211 can be fixed to the bottom protective plate 12 by welding or bolting. The valve plate 1212 is connected to the valve seat 1211 through the elastic element 1214. Under normal operating conditions, the two fit tightly together to form a sealed space. When the pressure in the bottom space 41 reaches the critical value, the gas impact force overcomes the elastic force and pushes the valve plate 1212 to rotate and open. That is, the valve plate 1212 opens on one side and remains locked on the other side, forming an exhaust channel 1213. After the pressure returns to normal, the elastic element 1214 can reset the valve plate 1212 to the sealed state to meet the needs of cyclic pressure relief.

[0041] Continue to refer to Figure 8 The exhaust valve 121 may include a valve seat 1211 and a valve plate 1212. The valve seat 1211 is fixed to the bottom protective plate 12 and has a through exhaust channel 1213. The valve seat 1211 and the valve plate 1212 are magnetically coupled to generate a magnetic attraction force, which holds the valve plate 1212 in the position where the exhaust channel 1213 is closed. When the valve plate 1212 is impacted by ejected material, it can overcome the magnetic attraction force and open the exhaust channel 1213. The valve plate 1212 may be made of a magnetically conductive alloy material and is magnetically coupled to a magnet inside the valve seat 1211. Under normal operating conditions, the two are tightly fitted together, forming a sealed space. When the pressure in the bottom space 41 reaches a critical value, the gas impact force overcomes the magnetic attraction force, causing the valve plate 1212 to detach on one side, forming a pressure relief path. After the pressure returns to normal, the magnetic force can reset the valve plate 1212 to the sealed state. By changing different magnet specifications, the pressure critical value for opening the exhaust valve 121 can be adjusted, resulting in more precise pressure control.

[0042] Back Figure 1 At least one exhaust valve 121 may be provided on the bottom protective plate 12. The area of ​​the bottom protective plate 12 is S1, in mm. 2 The sum of the areas of at least one exhaust valve 121 is S2, in mm. 2Here, 0.00001 ≤ S2 / S1 ≤ 0.06. Preferably, the ratio S2 / S1 can range from 0.001 to 0.05. More preferably, the ratio S2 / S1 can range from 0.002 to 0.04. Alternatively, the ratio S2 / S1 can also be 0.004, 0.008, 0.01, and 0.018. Based on the above proportional relationship, it is ensured that the exhaust valve 121 can provide sufficient exhaust channel area in the event of thermal runaway, while avoiding a significant reduction in the strength of the bottom guard plate 12 due to excessive openings. The exhaust valve 121 equipped with an elastic element 1214 or magnetic coupling has better strength and has less impact on the overall strength of the bottom guard plate 12, allowing for a wider range of the ratio between the pressure relief area and the area of ​​the bottom guard plate 12, maintaining the structural integrity of the exhaust valve 121 while increasing the effective pressure relief area.

[0043] refer to Figure 6 The thickness of the bottom protective plate 12 is T1, and the thickness of the exhaust valve 121 is T2, where 1 ≤ T2 / T1 ≤ 166.7. Preferably, the ratio T2 / T1 can range from 10 to 150. More preferably, the ratio T2 / T1 can range from 40 to 100. Alternatively, the ratio T2 / T1 can also be 50, 60, 70, 80, and 90. If the thickness T2 of the bottom protective plate 12 is too small, not only will the structural strength of the exhaust valve 121 be insufficient, but it may also undergo plastic deformation under gas pressure, affecting the sealing performance. If the thickness T2 of the bottom protective plate 12 is too large, the exhaust valve 121 will encroach on the arrangement of other components in the bottom space 41. When the battery pack 100 is subjected to external disturbances and vibrations, the exhaust valve 121 may interfere with the components below the bottom protective plate 12 and hinder the normal opening of the valve plate 1212. Based on the above proportions, the strength requirements of the exhaust valve 121 and the bottom guard plate 12 can be guaranteed, and the valve plate 1212 can be opened smoothly.

[0044] Back Figure 1 Multiple exhaust valves 121 may be provided on the bottom protective plate 12. Parallel pressure relief through multiple exhaust channels 1213 can improve the discharge speed and avoid localized pressure buildup caused by single-point pressure relief. This disclosure does not specifically limit the ranges of T1 and T2. For example, T1 can be 1 mm, 1.5 mm, 2 mm, 3 mm, or 4 mm. For example, T2 can be 10 mm, 15 mm, 20 mm, 30 mm, or 40 mm.

[0045] refer to Figure 1 and Figure 5The bottom protective plate 12 has an area of ​​S1, and the sum of the areas of the multiple exhaust valves 121 is S2, where 0.000004 ≤ S2 / S1 ≤ 0.06. Preferably, the ratio S2 / S1 can range from 0.0001 to 0.05. More preferably, the ratio S2 / S1 can range from 0.001 to 0.04. Alternatively, the ratio S2 / S1 can also be 0.002, 0.01, 0.02, and 0.03. Based on the above proportional relationship, it is ensured that the exhaust valves 121 can provide sufficient exhaust channel area during thermal runaway, while avoiding a significant reduction in the strength of the bottom protective plate 12 due to excessive openings, thus ensuring that the overall rigidity and mechanical properties of the bottom protective plate 12 are maintained while meeting the requirements for rapid gas release.

[0046] <Example Electrical Equipment>

[0047] This utility model embodiment also provides an electrical device 200, which may include the battery pack 100 described above.

[0048] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0049] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0050] In a non-restrictive example, refer to Figure 9 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0051] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0052] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0053] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first side beam and the second side beam), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0054] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0055] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The box body includes multiple side beams and a bottom assembly, the multiple side beams and the bottom assembly enclosing an internal space of the box, the bottom assembly including a bottom plate and a bottom protective plate, the bottom plate being located above the bottom protective plate and spaced apart from the bottom protective plate to form a bottom space; as well as The battery is placed inside the box and supported on the base plate, wherein... The battery is equipped with an explosion-proof valve at its bottom and an exhaust valve on the bottom protective plate. When the explosion-proof valve is opened, the battery ejects material sequentially through the through hole on the bottom plate, the bottom space, and the exhaust valve before being discharged. The plurality of side beams include a first side beam extending along a first direction. The length of the bottom protective plate in the second direction is L1 (in mm). The distance from the exhaust valve to the first side beam in the second direction is L2 (in mm). The first direction, the second direction, and the height direction are perpendicular to each other, and 0.033≤L2 / L1≤0.

99.

2. The battery pack according to claim 1, characterized in that, 1000mm≤L1≤3000mm, 100mm≤L2≤2000mm.

3. The battery pack according to claim 1, characterized in that, The first direction is the lateral direction of the battery pack.

4. The battery pack according to claim 3, characterized in that, The internal space of the box is divided into a battery compartment and an electrical compartment, with the battery placed in the battery compartment and the vent valve located below the electrical compartment.

5. The battery pack according to claim 4, characterized in that, The enclosure also includes a partition beam extending along the first direction, which divides the internal space of the enclosure into the battery compartment and the electrical compartment, and the exhaust valve is located between the first side beam and the partition beam in the second direction.

6. The battery pack according to claim 4, characterized in that, The bottom protective plate includes a first part and a second part. The first part is located below the battery compartment, and the second part is located below the electrical compartment. The distance from the first part to the bottom plate is greater than the distance from the second part to the bottom plate.

7. The battery pack according to claim 1, characterized in that, The bottom protective plate is provided with a first reinforcing structure and a second reinforcing structure that protrude to one side. The distance between the first reinforcing structure and the second reinforcing structure is L3, in mm, and 0.033≤L3 / L1≤0.

5.

8. The battery pack according to claim 7, characterized in that, 1000mm≤L1≤3000mm, 100mm≤L3≤500mm.

9. The battery pack according to claim 7, characterized in that, Both the first reinforcing structure and the second reinforcing structure extend along the first direction.

10. The battery pack according to claim 7, characterized in that, Both the first reinforcing structure and the second reinforcing structure extend along the second direction.

11. The battery pack according to claim 7 or 9, characterized in that, The exhaust valve is located between the first reinforcing structure and the second reinforcing structure.

12. The battery pack according to claim 3, characterized in that, The plurality of side beams also includes a second side beam, which is a longitudinal beam. The dimension of the bottom guard plate in the first direction is L4, in mm. The distance from the exhaust valve to the second side beam in the first direction is L5, in mm, and 0.05≤L5 / L4≤0.

99.

13. The battery pack according to claim 12, characterized in that, 1000mm≤L4≤2000mm, 100mm≤L5≤1500mm.

14. The battery pack according to claim 1, characterized in that, The exhaust valve includes a valve seat and a valve plate. The valve seat is fixed to the bottom protective plate and has a through exhaust channel. When the valve plate is not impacted by the ejected material, the exhaust channel is in a closed state.

15. The battery pack according to claim 14, characterized in that, The valve plate engages with the valve seat so that the valve plate can separate from the valve seat when impacted by the ejected material, thereby opening the exhaust passage.

16. The battery pack according to claim 15, characterized in that, At least one exhaust valve is provided on the bottom protective plate, and the area of ​​the bottom protective plate is S1, in mm. 2 The sum of the areas of the at least one exhaust valve is S2, in mm. 2 , 0.000004≤S2 / S1≤0.0314.

17. The battery pack according to claim 16, characterized in that, 250000mm 2 ≤S1≤9000000mm 2 ,36mm 2 ≤S2≤7850mm 2 。 18. The battery pack according to claim 15, characterized in that, The exhaust valve includes a valve seat, a valve plate, and an elastic element. The valve seat is fixed to the bottom protective plate and has a through exhaust channel. The elastic element holds the valve plate in a position where the exhaust channel is closed. When the valve plate is impacted by the ejected material, it overcomes the elastic force of the elastic element and opens the exhaust channel.

19. The battery pack according to claim 15, characterized in that, The exhaust valve includes a valve seat and a valve plate. The valve seat is fixed to the bottom protective plate and has a through exhaust channel. The valve seat and the valve plate are magnetically coupled to generate a magnetic attraction force. The magnetic attraction force holds the valve plate in the position of closing the exhaust channel. When the valve plate is impacted by the ejected material, it can overcome the magnetic attraction force and open the exhaust channel.

20. The battery pack according to claim 18 or 19, characterized in that, At least one exhaust valve is provided on the bottom protective plate, and the area of ​​the bottom protective plate is S1, in mm. 2 The sum of the areas of the at least one exhaust valve is S2, in mm. 2 , 0.00001≤S2 / S1≤0.

06.

21. The battery pack according to claim 20, characterized in that, 250000mm 2 ≤S1≤9000000mm 2 ,90mm 2 ≤S2≤15000mm 2 。 22. The battery pack according to claim 1, characterized in that, The thickness of the bottom guard plate is T1, in mm, and the thickness of the exhaust valve is T2, in mm, where 1 ≤ T2 / T1 ≤ 166.

7.

23. The battery pack according to claim 22, characterized in that, 0.3mm≤T1≤5mm, 1mm≤T2≤50mm.

24. The battery pack according to claim 1, characterized in that, The bottom protective plate is equipped with multiple exhaust valves.

25. The battery pack according to claim 24, characterized in that, The area of ​​the bottom protective plate is S1, in mm. 2 The sum of the areas of the plurality of exhaust valves is S2, in mm. 2 , 0.000004≤S2 / S1≤0.

06.

26. The battery pack according to claim 25, characterized in that, 250000mm 2 ≤S1≤9000000mm 2 ,36mm 2 ≤S2≤15000mm 2 。 27. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 26.

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