Battery pack and electric device

Abstract

The utility model relates to battery technology field provides a kind of battery pack and electrical equipment.The battery pack includes: box, battery pack, bulge and explosion-proof valve.Box includes bottom wall, the multiple side walls around the bottom wall and are connected to bottom wall and support in multiple side walls and cover plate.Bottom wall, multiple side walls and cover plate jointly form a containing space.Battery pack includes multiple batteries and is contained in containing space.Bulge is bulged from at least one side wall in multiple side walls.Explosion-proof valve is connected to bulge and is formed with bulge together with bulge space, and it can be separated from bulge to release the pressure in containing space with bulge.Containing space's volume is V1, unit is mm 3 , bulge space's volume is V2, unit is mm 3 , 0.08≤V2 / V1≤0.15.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and an electrical device including the battery pack. Background Technology

[0002] Battery packs are common energy storage devices, consisting of a housing and batteries placed inside. During operation, batteries may generate high-temperature flammable gases due to overcharging or short circuits. To ensure the thermal safety of the battery pack, explosion-proof valves are installed on the side walls of the housing to release these high-temperature flammable gases.

[0003] However, traditional explosion-proof valves are directly connected to the side wall of the enclosure. This reduces the strength of the enclosure. For thinner battery packs, especially marine battery packs, such enclosures may rupture outside the designed location of components like the explosion-proof valves when subjected to vibration or impact, posing a hazard to the surrounding environment. Utility Model Content

[0004] In view of this, the present invention provides a battery pack having a raised portion protruding from the side wall of the housing. The battery pack includes a housing, a battery pack, a raised portion, and an explosion-proof valve. The housing includes a bottom wall, multiple side walls arranged around the bottom wall, and a cover plate, which together form a receiving space. The battery pack includes multiple batteries and is received within the receiving space. The raised portion protrudes from at least one of the multiple side walls. The explosion-proof valve is connected to the raised portion and together with the raised portion forms a raised portion space communicating with the receiving space, and can be separated from the raised portion to release pressure in the receiving space. The volume of the receiving space is V1, in mm. 3 The volume of the raised section is V2, in mm. 3 , 0.08≤V2 / V1≤0.15.

[0005] By placing the explosion-proof valve on the raised section, and ensuring that the raised section and the explosion-proof valve together form a raised space communicating with the containment space, the strength of the connection between the explosion-proof valve and the enclosure, as well as the adjacent area, is enhanced. When high-temperature flammable gas is generated on one side of the explosion-proof valve, the gas will be buffered and accumulated in the raised section, or the gas will be guided by the raised section and preferentially contact the explosion-proof valve. Therefore, this battery pack design ensures that the operation or cracking of the explosion-proof valve precedes the cracking of the raised section. This allows high-temperature flammable gas to always be discharged from its designed location, preventing unintended impacts on operators or other mechanisms, thereby improving the safety of the battery pack.

[0006] Another aspect of this utility model provides an electrical device having the aforementioned battery pack. Because it has the aforementioned battery pack, this electrical device possesses all the technical effects of the aforementioned battery pack, which will not be elaborated upon here. Attached Figure Description

[0007] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on 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 an exploded view of the battery pack disclosed in this utility model.

[0011] Figure 2 for Figure 1 A schematic diagram of the battery structure in the battery pack.

[0012] Figure 3 for Figure 1 A structural schematic diagram of the battery pack from another perspective.

[0013] Figure 4 for Figure 1 A structural schematic diagram of the battery pack from another perspective.

[0014] Figure 5 for Figure 1 A structural schematic diagram of the battery pack from another perspective.

[0015] Figure 6 for Figure 5 Enlarged view of part A of the battery pack.

[0016] Figure 7 for Figure 1 Another structural diagram of the battery pack, in which the explosion-proof valve has been removed.

[0017] Figure 8 for Figure 1 Another structural diagram of the battery pack, in which the explosion-proof valve has been removed.

[0018] Figure 9 for Figure 8 Enlarged view of part B of the battery pack.

[0019] Figure 10 This is a schematic diagram of another battery pack disclosed in this utility model.

[0020] Figure 11 This is a schematic diagram of an electrical device disclosed in this utility model. 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] This utility model embodiment provides a battery pack 100. The battery pack 100 includes a battery group composed of multiple individual batteries 102 connected in series and / or parallel, a battery management system (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. The above components are placed inside a housing 101, sealed by a cover plate 1014, and together with the housing 101 and the cover plate 1014, form a complete functional unit that can directly output electrical energy.

[0023] refer to Figure 1 The battery pack 100 includes a housing 101, a battery 102, a raised portion 115 disposed on at least one side wall of the housing 101, and an explosion-proof valve 116 connected to the side of the raised portion 115 away from the side wall.

[0024] In this invention, the housing 101 refers to a closed or semi-closed structure made of materials such as metal and plastic, which serves as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The housing 101 can be cast from materials such as steel plates and aluminum alloys, or it can be made from lightweight materials, such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0025] In this invention, battery 102 is an energy storage unit capable of repeated charging and discharging, which can be interpreted as a "secondary battery." In this application, the concept of "secondary battery" can include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries. Battery 102 can be, for example, a square battery, which can be understood as a battery with a quadrangular prism shape. Battery 102 can also be a battery with other cross-sectional shapes along its height. The following will use a square battery as an example to describe the battery pack 100 of this invention in detail. Battery 102 includes a battery casing and battery cells. The battery cells are arranged in the battery casing and function to reversibly convert chemical energy into electrical energy. A first terminal 1022 and a second terminal 1023 with opposite polarities are disposed at the top of the battery casing and function as the output terminals of battery 102. An exhaust valve 107 is disposed between the first terminal 1022 and the second terminal 1023, and its function is to release the high-temperature flammable gas generated by the battery cell in the battery casing when the battery 102 is overcharged or short-circuited. The battery pack comprises multiple batteries 102 in relatively defined positions. The batteries 102 can be connected to each other in parallel or series via components such as conductive busbars, and constrained to each other by components such as straps. In this invention, the number and arrangement of batteries in the battery pack are not limited.

[0026] For ease of understanding, in the attached figures, the X-axis represents the width direction of the battery pack 100, which is also the width direction of the housing 101; the Y-axis represents the thickness direction of the battery pack 100, which is also the thickness direction of the housing 101; and the Z-axis represents the height direction of the battery pack 100, which is also the height direction of the housing 101. The positive direction of the Z-axis points from the bottom surface of the battery pack 100 to its top surface, which is also the direction from the bottom wall 1013 of the housing 101 to the cover plate 1014. The terms "top" or "bottom" used in any element of this disclosure can be used as a reference here.

[0027] refer to Figure 1 and Figure 2 The housing 101 includes a pair of side walls 1011 disposed opposite each other along the width direction, a pair of side walls 1012 disposed opposite each other along the thickness direction, a bottom wall 1013, and a cover plate 1014. The side walls 1011 and 1012 are respectively connected to the bottom wall 1013. The cover plate 1014 is supported by both the pair of side walls 1011 and the pair of side walls 1012, together forming an accommodating space. Multiple batteries 102 can be arranged in this accommodating space. The side walls 1011 of the housing 101 may be opposite to the first wall portion 102a of the battery 102. The bottom surfaces of the multiple batteries 102 can be fixed to the bottom wall 1013 using adhesives, fasteners, or similar means. Subsequently, components such as cable ties can be applied to the multiple batteries 102 to form a battery pack with relatively defined dimensions in both the width and thickness directions.

[0028] When battery 102 is in operation, it may heat up and expand, especially when the internal temperature of battery 102 rises sharply due to short circuits, overcharging, or other reasons. In such cases, the battery cells of battery 102 will generate a large amount of high-temperature flammable gas. Because battery pack 100 has excellent sealing performance, the above phenomenon may cause a sharp increase in pressure within the containment space. To ensure the thermal safety of battery pack 100 and prevent damage or even explosion of the casing 101 due to excessive pressure within battery pack 100, an explosion-proof valve 116 is typically installed on at least one side wall 1011 or 1012 of casing 101.

[0029] Preferably, refer to Figure 4 The minimum distance from the side wall 1011 equipped with the explosion-proof valve 116 to the first wall portion 102a is d1, in mm, where 15mm ≤ d1 ≤ 35mm. The distance between the side wall 1011 and the first wall portion 102a should not be too large or too small. If the distance is too large, the battery pack 100 will have a larger size, or the energy density of the battery pack 100 will decrease. If the distance is too small, when high-temperature flammable gas is generated, it will quickly fill the space between the side wall 1011 and the battery 102a, accumulating high pressure in a short time, which may cause the thin-walled battery pack 100, especially marine battery packs, to crack or even explode.

[0030] Optionally, d1 can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, or 35mm. A d1 within the above range can balance the small size and high energy density of the battery pack 100 while ensuring its thermal safety. Similarly, when the explosion-proof valve 116 is located on the side wall 1012, the minimum distance from the side wall 1012 to the corresponding wall portion of the battery 102 can also be set in this way and have the corresponding effect; this will not be elaborated further in this invention.

[0031] The explosion-proof valve 116 is a component that is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery pack 100 reaches a predetermined threshold. It is used to prevent the risk of explosion caused by overcharging or short circuit of the battery 102. When the battery 102 is operating normally, the explosion-proof valve 116 seals the housing 101 to ensure the normal operation of the battery 102. In the event of thermal runaway of the battery 102, the explosion-proof valve 116 needs to open promptly to release internal gases and heat, thereby reducing the risk of battery pack 100 explosion. The explosion-proof valve 116 can be made of metal or flame-retardant polymer materials such as polyvinyl chloride, polyvinylidene chloride, or fluoroplastics.

[0032] By incorporating an explosion-proof valve 116, when the pressure in the containment space exceeds a certain threshold, the explosion-proof valve 116 or its connection point can rupture preferentially before the enclosure 101, thereby releasing the high-temperature flammable gas from the containment space. This prevents the accumulation of high-temperature flammable gas in the containment space and avoids potential combustion of the battery pack due to accumulation, thus ensuring the thermal safety of the battery pack 100. Since the location of the pressure release is relatively fixed, inspecting the battery pack 100 is easier while preventing high-temperature flammable gas from affecting operators or other mechanisms, further enhancing the safety of the battery pack 100.

[0033] refer to Figure 1 , Figure 3 and Figure 5 By way of example only, the raised portion 115 and the explosion-proof valve 116 are disposed on one of a pair of sidewalls 1011 arranged opposite each other along the width direction of the battery pack 100, and the explosion-proof valve 116 is connected to the side of the raised portion 115 away from the sidewall 1011. Depending on actual needs, the raised portion 115 and the explosion-proof valve 116 can be disposed on any one of the pair of sidewalls 1011 of the housing 101 and the sidewalls 1012 arranged opposite each other along the thickness direction of the battery pack 100. In some possible embodiments, the raised portion 115 and the explosion-proof valve 116 can be disposed on multiple sidewalls of the pair of sidewalls 1011 and the pair of sidewalls 1012 of the housing 101. The structure and shape of the raised portion 115 and the explosion-proof valve 116 described below can be applied similarly and have the same or similar effects, and will not be elaborated further here.

[0034] The raised portion 115 is advantageous. The inventors have discovered a problem with the battery pack 100, where the explosion-proof valve 116 is directly connected to the housing 101: the housing 101 cracks outside the location of the explosion-proof valve 116. The inventors believe that due to the different materials of the explosion-proof valve 116 and the housing 101, the connection point and the adjacent area are weaker. Furthermore, because the location of the battery 102 in the battery pack 100 that experiences a short circuit or overcharge is unpredictable, the flow of high-temperature flammable gas generated by its cells within the containment space is difficult to predict, and therefore may impact the explosion-proof valve 116 from one side, i.e., from the top side, causing the weaker area near the explosion-proof valve 116 to crack before or simultaneously with the explosion-proof valve 116. By providing a raised portion 115 and connecting an explosion-proof valve 116 to it, the explosion-proof valve 116 and the raised portion 115 together form a raised space. The ratio of the volume V2 of the raised space to the volume V1 of the containing space satisfies: 0.08 ≤ V2 / V1 ≤ 0.15. High-temperature flammable gas is buffered and accumulated in the raised space to act evenly on the explosion-proof valve 116, or the high-temperature flammable gas is guided by the raised space to ensure preferential contact between the explosion-proof valve 116 and the high-temperature flammable gas, thereby ensuring that the high-temperature flammable gas is discharged from a predetermined location in the battery pack 100. The raised portion 115 also increases the strength of the connection between the explosion-proof valve 116 and the housing 101, as well as the adjacent area, ensuring that the high-temperature flammable gas is not easily breached at the connection between the explosion-proof valve 116 and the housing 101, and thus ensuring that the high-temperature flammable gas is discharged from the predetermined location. When subjected to impacts, the battery pack 100 is also designed to reduce the risk of the explosion-proof valve 116 rupturing unintentionally, thereby improving the safety performance of the battery pack 100.

[0035] Optionally, the values ​​of V2 / V1 can be: 0.080, 0.085, 0.090, 0.095, 0.100, 0.105, 0.110, 0.115, 0.120, 0.125, 0.130, 0.135, 0.140, 0.145 or 0.150.

[0036] refer to Figure 1 , Figures 5 to 9In one possible implementation, the raised portion 115 protrudes towards the side away from the receiving space, that is, the raised portion 115 protrudes towards the outer side of the housing 101. In this case, the raised portion 115 may include a transition portion 115a, an extension portion 115b, and a raised end portion 115c. The transition portion 115a is a circumferential arc surface that protrudes from the side wall 1011 towards the center of the raised portion 115. The extension portion 115b may be a frustum-shaped side surface that tapers from the transition portion 115a towards the center of the raised portion 115, or it may be a cylindrical side surface. The raised end portion 115c is a circumferential arc surface that is recessed towards the center of the raised portion 115. The raised portion 115 also includes an inner peripheral edge 115d, which is an end face located at the minimum diameter of the raised end portion 115c. Preferably, the inner peripheral edge 115d is parallel to the first side wall 1011.

[0037] refer to Figure 8 and Figure 9 A positioning protrusion 115e may be provided on the inner periphery 115d. The positioning protrusion 115e is located on the side of the raised portion 115 away from the receiving space, and its function is to assist the explosion-proof valve 116 in positioning to the raised end 115c. Preferably, multiple positioning protrusions 115e may be provided on the inner periphery 115d, and the multiple positioning protrusions 115e may be arranged circumferentially at intervals on the raised end 115c. Figure 3 In the example shown, four positioning protrusions 115e are provided on the inner periphery 115d. Preferably, refer to Figure 6 and Figure 9 The distance d6 from the farthest end of the positioning protrusion 115e to the side wall 1011 is less than or equal to the distance d2 from the explosion-proof valve 116 to the side wall 1011. That is, the positioning protrusion 115e extends into the explosion-proof valve 116 without extending beyond it. This arrangement of the positioning protrusion 115e ensures the relative position of the explosion-proof valve 116 and the raised portion 115 while minimizing space requirements. This facilitates the arrangement and handling of the battery pack 100.

[0038] Preferably, refer to Figure 7 The raised portion 115 is further provided with a mounting portion 115f. The mounting portion 115f may be a mounting hole that allows a positioning protrusion 115e to pass through. Preferably, a plurality of mounting portions 115f are arranged circumferentially spaced along the inner periphery 115d. The positioning protrusion 115e may be a positioning element such as a bolt, which cooperates with a fastener such as a nut to mount each positioning protrusion 115e to the mounting portion 115f.

[0039] The raised portion 115 is advantageous in this configuration. Compared to the explosion-proof valve 116 directly mounted on the side wall 1011, the transition portion 115a, the extension portion 115b, and the raised end portion 115c form a space communicating with the receiving space (hereinafter referred to as the raised portion space). The explosion-proof valve 116 is connected to the raised end portion 115c and communicates with the receiving space through the raised portion space. When a battery 102 is short-circuited or overcharged, regardless of the battery 102's position in the housing 101, the high-temperature flammable gas it generates always flows into the raised portion space through the arc surface of the transition portion 115a and accumulates in the raised portion space, ultimately acting evenly on the explosion-proof valve 116. This ensures that the battery pack 100 can always discharge high-temperature flammable gas from the explosion-proof valve 116, thus ensuring the safety of the battery pack 100.

[0040] The housing 101 may also be provided with an outer housing edge 1015 extending from the sidewall 1011. Preferably, the outer housing edge 1015 extends from the opposite sidewall 1011 and the opposite sidewall 1012. In one possible embodiment, the outer housing edge 1015 is configured to extend from the side of the opposite sidewall 1011 and the opposite sidewall 1012 away from the receiving space, that is, the outer housing edge 1015 is configured to protrude outward from the outer surface of the opposite sidewall 1011 and the opposite sidewall 1012. Preferably, along the height direction, the top surface of the outer housing edge 1015 is aligned with the top surfaces of the opposite sidewall 1011 and the opposite sidewall 1012. Correspondingly, the cover plate 1014 also includes an outer cover edge 1016. The outer cover edge 1016 is arranged along the outer periphery of the cover plate 1014 and supported to the outer box edge 1015 to position the cover plate 1014 to the pair of side walls 1011 and the pair of side walls 1012.

[0041] Preferably, refer to Figure 6 Viewed along the height direction, the distance from the explosion-proof valve 116 to the side wall 1011 is d2, in mm. The width of the outer casing edge is w1, in mm. Wherein, 0.5 ≤ w1 / d2 ≤ 1, that is, viewed along the height direction, although the explosion-proof valve 116 is connected to the raised portion 115 facing outwards, the dimension of the explosion-proof valve 116 in the direction perpendicular to the side wall 1011 does not exceed the width of the outer casing edge 1015.

[0042] Optionally, the value of w1 / d2 can be: 0.50, 0.52, 0.54, 0.56, 0.58, 0.60, 0.62, 0.64, 0.66, 0.68, 0.70, 0.72, 0.74, 0.76, 0.78, 0.80, 0.82, 0.84, 0.86, 0.88, 0.90, 0.92, 0.94, 0.96, 0.98, or 1.00.

[0043] It is understood that, based on w1 / d2 meeting the above range, the width of the outer casing edge can satisfy: 25mm≤w1≤45mm, and / or, the distance from the explosion-proof valve 116 to the side wall 1011 can satisfy: 28mm≤d2≤50mm. In use, w1 can be determined according to the requirements of the battery 102, and then d2 can be determined according to the value of w1.

[0044] Optionally, w1 can be 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm or 45mm.

[0045] Optionally, d2 can be 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, or 50mm.

[0046] The battery pack 100 is advantageously configured in this way. To ensure that the explosion-proof valve 116 operates only when discharging high-temperature flammable gases, it is necessary to reduce the impact on the explosion-proof valve 116 during handling and arrangement of the battery pack 100. By setting 0.5 ≤ w1 / d2 ≤ 1, sufficient strength can be provided for the connection point and adjacent area of ​​the explosion-proof valve 116, while the risk of impact to the explosion-proof valve 116, at least along its thickness, can be reduced through the outer casing edge 1015, thus improving the safety of the battery pack 100. Preferably, w1 / d2 = 1. The battery pack 100 is particularly advantageous in this configuration. In addition to the advantages of the above-described embodiment, the battery pack 100 also has a smaller dimension, at least along its thickness. This facilitates handling and arrangement of the battery pack 100.

[0047] Return to reference Figure 3 Preferably, on the side wall 1011, the distance from the raised portion 115 along the height direction to the outer edge 1015 of the box is d3, in mm, where 30mm ≤ d3 ≤ 55mm. Optionally, the value of d3 can be: 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, or 55mm.

[0048] Optionally, the distance from the center of the raised portion 115 along the width direction to one side of the sidewall 1011 is d4, in mm. The distance along the width direction to the other side of the sidewall 1011 is d5, in mm. The ratio of the distance from the center of the raised portion 115 along the width direction to the other side of the sidewall 1011 to the distance from the center of the raised portion 115 along the width direction to one side of the sidewall 1011 can satisfy: 0.28 ≤ d5 / d4 ≤ 0.037. Optionally, the values ​​of d5 / d4 can be: 0.280, 0.285, 0.290, 0.295, 0.300, 0.305, 0.310, 0.315, 0.320, 0.325, 0.330, 0.335, 0.340, 0.345, 0.350, 0.355, 0.360, 0.365, or 0.370.

[0049] Based on the above range of d5 / d4, the value of d4 can be: 430mm≤d4≤460mm.

[0050] Optionally, the value of d4 can be: 430mm, 431mm, 432mm, 433mm, 434mm, 435mm, 436mm, 437mm, 438mm, 439mm, 440mm, 441mm, 442mm, 443mm, 444mm, 445mm, 446mm, 447mm, 448mm, 449mm, 450mm, 451mm, 452mm, 453mm, 454mm, 455mm, 456mm, 457mm, 458mm, 459mm, or 460mm.

[0051] Based on the above range of d5 / d4, the value of d5 can be: 130mm≤d5≤160mm.

[0052] Optionally, the value of d5 can be: 130mm, 131mm, 132mm, 133mm, 134mm, 135mm, 136mm, 137mm, 138mm, 139mm, 140mm, 141mm, 142mm, 143mm, 144mm, 145mm, 146mm, 147mm, 148mm, 149mm, 150mm, 151mm, 152mm, 153mm, 154mm, 155mm, 156mm, 157mm, 158mm, 159mm, or 160mm.

[0053] This configuration of the battery pack 100 is advantageous. As mentioned above, it is desirable that the high-temperature flammable gas generated by the battery 102 in the battery pack 100 be discharged through the explosion-proof valve 116. By positioning the protrusion 115 and the explosion-proof valve 116 relatively close to the top surface of the battery 102 on the side wall 1011, i.e., relatively close to the exhaust valve 107 of the battery 102, it can be ensured that the explosion-proof valve 116 operates preferentially over deformation or even cracking of the side wall 1011, thereby venting gas at a specific location, which improves the safety of the battery pack 100. However, the explosion-proof valve 116 should not be positioned too close to the outer casing edge 1015 to avoid interference between the explosion-proof valve 116 and the fasteners passing through the outer casing edge 1015.

[0054] refer to Figure 10 In one possible implementation, the battery pack 100 includes a plurality of raised portions 115 and a plurality of explosion-proof valves 116 disposed on the side wall 1011, the plurality of raised portions 115 and the plurality of explosion-proof valves 116 being spaced apart along the width direction.

[0055] This arrangement of the battery pack 100 is advantageous. Because the generation of high-temperature flammable gas by the battery 102 within the battery pack 100 is unpredictable, when multiple spaced-apart explosion-proof valves 116 are provided, the explosion-proof valve 116 closest to the battery 102 will operate preferentially over deformation or even cracking of the sidewall 1011, thereby venting gas at a specific location. This arrangement is particularly advantageous when the battery 102 is especially far from the explosion-proof valve 116, for example, when the battery 102 is located at the center of the battery pack 100. Similarly, multiple spaced-apart explosion-proof valves 116 can be provided on one or more of the opposite sidewalls 1011 and 1012, which will not be elaborated upon here.

[0056] At this point, the area of ​​sidewall 1011 is S2, in mm. 2 The sum of the areas of the multiple raised portions 115 is S1, in mm. 2 The ratio of S1 / S2 can satisfy: 0.04 ≤ S1 / S2 ≤ 0.07. This configuration of the explosion-proof valve 116 allows sufficient pressure in the containment space to be released from at least one of the plurality of explosion-proof valves 116, and is advantageous in dealing with uncertain positions of the battery 102. This improves the safety of the battery pack 100.

[0057] Optionally, the values ​​of S1 / S2 can be: 0.040, 0.041, 0.042, 0.043, 0.044, 0.045, 0.046, 0.047, 0.048, 0.049, 0.050, 0.051, 0.052, 0.053, 0.054, 0.055, 0.056, 0.057, 0.058, 0.059, 0.060, 0.061, 0.062, 0.063, 0.064, 0.065, 0.066, 0.067, 0.068, 0.069, or 0.070.

[0058] Preferably, the raised portion 115 is made of the same material as the sidewall 1011. Preferably, the raised portion 115 is formed by stamping the sidewall 1011. Subsequently, the explosion-proof valve 116 is connected to the raised portion 115 via, for example, a mounting portion 115f and a positioning protrusion 115e.

[0059] refer to Figure 11 This utility model also discloses an electrical device 1000, including a battery pack 100 as described above. The electrical device 1000 can be a device such as a car or communication equipment that requires the battery pack 100 to be fixedly connected to the device and moved with it, or it can be a device such as a ship that allows the battery pack 100 to be moved and transported during use. As a preferred embodiment, the battery pack 100 provided by this utility model has a small size and light weight, making it particularly suitable for supplying power to ships.

[0060] 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 utility model will not describe the various possible combinations separately.

[0061] 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.

[0062] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.

[0063] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: The housing (101) includes a bottom wall (1013), a plurality of side walls (1011, 1012) surrounding the bottom wall (1013) and connected to the bottom wall (1013), and a cover plate (1014) supported on the plurality of side walls (1011, 1012). The bottom wall (1013), the plurality of side walls (1011, 1012) and the cover plate (1014) together form an accommodating space. A battery pack, including a plurality of batteries (102), is housed in the housing space; The raised portion (115) rises from at least one of the plurality of sidewalls (1011, 1012); An explosion-proof valve (116) is connected to the raised portion (115) and together with the raised portion (115) forms a raised space communicating with the receiving space. It is capable of separating from the raised portion (115) to release pressure in the receiving space. The volume of the accommodating space is V1, in mm. 3 The volume of the raised space is V2, in mm. 3 , 0.08≤V2 / V1≤0.

15.

2. The battery pack (100) according to claim 1, characterized in that, The raised portion (115) is raised toward the side away from the receiving space.

3. The battery pack (100) according to claim 1, characterized in that, The minimum distance from the sidewall to the battery pack is d1, in mm, where 15mm≤d1≤35mm.

4. The battery pack (100) according to claim 1, characterized in that, The housing (101) includes an outer edge (1015) located on the top side of the raised portion (115) along the height direction of the battery pack (100) and extending from the plurality of sidewalls (1011, 1012) toward the side away from the receiving space.

5. The battery pack (100) according to claim 4, characterized in that, Viewed along the height direction of the battery pack (100), the distance from the explosion-proof valve (116) to the side wall is d2 in mm, and the width of the outer casing edge (1015) is w1 in mm, 0.5≤w1 / d2≤1, and / or, 25mm≤w1≤45mm, and / or, 28mm≤d2≤50mm.

6. The battery pack (100) according to claim 3, characterized in that, The raised portion (115) also includes a positioning protrusion (115e), which is located on the side of the raised portion (115) away from the receiving space.

7. The battery pack (100) according to claim 6, characterized in that, The distance from the farthest end of the positioning protrusion (115e) to the side wall is less than or equal to the distance from the explosion-proof valve (116) to the side wall.

8. The battery pack (100) according to claim 1, characterized in that, The raised portion (115) protrudes toward the side where the receiving space is located.

9. The battery pack (100) according to claim 8, characterized in that, It also includes an inner casing edge (1015'), which is located on the top side of the raised portion (115) along the height direction of the battery pack (100) and extends from the plurality of sidewalls (1011, 1012) toward the side where the receiving space is located.

10. The battery pack (100) according to claim 1, characterized in that, The raised portion (115) includes a transition portion (115a), an extension portion (115b), and a raised end portion (115c) arranged sequentially in a direction away from the sidewall. The transition portion (115a) is a circumferential arc surface protruding toward the center of the raised portion. The diameter of the extension portion (115b) gradually decreases in a direction away from the third party. The raised end portion (115c) is an end face parallel to the sidewall, and the diameter of the raised end portion (115c) is less than or equal to the minimum diameter of the extension portion (115b).

11. The battery pack (100) according to claim 10, characterized in that, The raised portion (115) also includes a mounting portion (115f), which is disposed at the raised end portion (115c) and extends toward the center of the raised portion (115) in a plane perpendicular to the sidewall.

12. The battery pack (100) according to claim 11, characterized in that, The raised portion (115) includes a plurality of mounting portions (115f) arranged circumferentially at intervals along the raised end portion (115c), each mounting portion (115f) having a mounting hole.

13. The battery pack (100) according to claim 1, characterized in that, The housing (101) includes an outer edge (1015), and the distance from the raised portion (115) to the outer edge (1015) along the height direction of the battery pack (100) is d3, in mm, where 30mm≤d3≤55mm.

14. The battery pack (100) according to claim 13, characterized in that, The distance from the center of the raised portion (115) along the width direction of the battery pack (100) to one side of the sidewall is d4, in mm, and the distance along the width direction to the other side of the sidewall is d5, in mm, 0.28≤d5 / d4≤0.37, and / or, 430mm≤d4≤460mm, and / or, 130mm≤d5≤160mm.

15. The battery pack (100) according to claim 1, characterized in that, The raised portion (115) is formed by stamping on the sidewall.

16. An electrical appliance (1000), characterized in that, The battery pack (100) includes any one of claims 1-15.

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