Battery pack and electric device

Abstract

The present disclosure provides a battery pack and an electric device, the battery pack comprising: a box body comprising a surrounding frame, a bottom plate and a cover; the bottom of the surrounding frame is formed with a first top surface, the first top surface is provided with a protruding part, and the cover is connected to the first top surface; the protruding part has a first side surface on the side facing the accommodating cavity, and the surrounding frame at the corresponding position has a second side surface on the side facing the accommodating cavity; in the first direction, the minimum size of the first side surface is h1 mm, the minimum size of the second side surface is h2 mm, and the minimum size of the battery is Hmm, and 0.88<=<=1.12 is satisfied. Compared with the related art, by arranging the protruding part on the top of the surrounding frame, the surrounding frame and the protruding part together form sufficient effective support height, so that the force generated by the battery pack when swelling or displacement can be uniformly transmitted, thereby reducing the safety risks such as deformation of the battery shell, internal short circuit or thermal runaway.

Description

Technical Field

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

[0002] In related technologies, a battery pack typically consists of a housing (including a frame, base plate, and cover) and a battery pack housed within the housing, which comprises multiple batteries. To improve the energy density of the battery pack, the battery packs are often designed with a close arrangement.

[0003] However, when the battery pack is subjected to external vibration, impact, or thermal expansion and contraction, the battery pack will expand or shift to a certain extent. This can easily lead to rigid contact between the outermost battery and the side wall of the casing. If the top structure of the casing frame (especially the part connecting to the cover) is not designed properly, for example, if the effective support height between the top of the frame and the battery pack is insufficient (i.e., the side of the frame used to contact the battery pack is too small), the expansion force of the battery pack cannot be evenly distributed, resulting in local stress concentration in the contact area between the battery and the top of the frame. This can squeeze the battery, causing deformation of the battery casing, and even triggering safety accidents such as internal short circuits and thermal runaway. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery pack and an electrical device to solve the technical problem of localized stress concentration in the contact area between the battery and the top of the frame in the related art.

[0005] In a first aspect, this disclosure provides a battery pack, comprising: The box body includes a frame, a bottom plate, and a cover. In a first direction, the bottom of the frame is fixed to the bottom plate, and the top of the frame is fixed to the cover to enclose and form an accommodating cavity. A battery pack is disposed within the receiving cavity, and the battery pack includes multiple batteries; The top of the frame has a first top surface, and a protrusion is provided on the first top surface. The cover is connected to the first top surface, and the connection between the cover and the first top surface is further away from the battery pack than the protrusion. The protrusion has a first side facing the receiving cavity, and the corresponding frame has a second side facing the receiving cavity. The first and second sides are used to directly or indirectly abut against the battery pack. In the first direction, the minimum dimension of the first side is h1mm, the minimum dimension of the second side is h2mm, and the minimum dimension of the battery is Hmm, satisfying 0.88 ≤ ≤1.12.

[0006] Secondly, this disclosure provides an electrical device including the aforementioned battery pack.

[0007] Compared with related technologies, this disclosure provides a protrusion at the top of the frame, ensuring that the frame and the protrusion together form a sufficient effective support height. This allows the force generated by the battery pack during expansion or displacement to be transmitted evenly, avoiding stress concentration in the contact area between the battery and the top of the frame. This significantly reduces local stress peaks, thereby reducing safety risks such as battery casing deformation, internal short circuits, or thermal runaway, and improving the reliability of the battery pack. Attached Figure Description

[0008] Figure 1 This is a perspective view of the battery pack provided in an embodiment of this disclosure.

[0009] Figure 2 yes Figure 1 Side view with some parts hidden.

[0010] Figure 3 yes Figure 2 Enlarged diagram of point A.

[0011] Figure 4 yes Figure 1 A perspective view of the portion of the battery pack frame with protrusions.

[0012] Figure 5 yes Figure 4 A side view of the partial enclosure with protrusions is provided.

[0013] Figure 6 yes Figure 4 A front view of a portion of the enclosure with continuously extending protrusions.

[0014] Figure 7 yes Figure 4 A front view of a portion of the frame with intermittent protrusions is provided.

[0015] Figure 8 yes Figure 1 A schematic diagram showing the connection status between the cover and the frame of the provided battery pack.

[0016] Explanation of reference numerals in the attached figures: 10-Box body, 11-Frame, 111-First top surface, 112-Second side surface, 12-Bottom plate, 13-Cover body, 131-Second connecting part, 14-Protrusion, 141-First side surface, 142-First connecting part, 143-Leaving arc surface, 144-Cavity, 145-Sub-protrusion, 15-Functional layer, 16-Cavity; 20 - Battery, 201 - First outer surface, 202 - Second outer surface; D1 - First direction; D2 - Second direction; D3-Third direction. Detailed Implementation

[0017] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0018] like Figures 1 to 8 As shown, an embodiment of this disclosure provides a battery pack, including a housing 10 and a battery pack disposed within the housing 10.

[0019] The battery pack, as a rechargeable battery, is the power source for new energy vehicles. The battery pack includes a battery pack composed of multiple batteries 20 connected in series and / or in parallel, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components. All of the above components are placed inside the housing 10 and sealed by the cover 13 to form a complete functional unit that can directly output electrical energy.

[0020] The housing 10 includes a frame 11, a base plate 12, and a cover 13. In a first direction D1, the bottom of the frame 11 is fixed to the base plate 12, and the top of the frame 11 is fixed to the cover 13 to form a receiving cavity. In the embodiments of this disclosure, the first direction D1 is the direction of gravity.

[0021] The battery pack is housed within a cavity and comprises multiple batteries 20 connected in series or parallel. Each battery 20 includes a casing and cells disposed within the casing. The battery 20 can store chemical energy and controllably convert it into electrical energy. In recyclable batteries 20, the active materials can be reactivated by charging after discharge, allowing for continued use.

[0022] In the embodiments provided in this disclosure, the housing 10 refers to a closed or semi-closed structure made of materials such as metal and plastic, which is the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0023] The enclosure 10 provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, these components are fixed inside the enclosure 10 to ensure that they maintain a relatively stable position during battery pack operation, and to avoid damage to components or loosening of connections due to vibration, impact or other factors.

[0024] The housing 10 includes a lower housing and an upper housing. The lower housing includes a bottom plate 12 and a frame 11 connected to and surrounding the bottom plate 12. The upper housing is connected to the frame 11 and has a cover 13 disposed opposite to the bottom plate 12. The upper housing and the lower housing together enclose a receiving cavity.

[0025] The frame 11 generally has four side panels. The four side panels can be integrally formed with the base plate 12 or can be processed and formed separately by fixing them together.

[0026] The enclosure 10 can be cast from materials such as steel plate or aluminum alloy, or it can be made of lightweight materials, such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials. The shape of the enclosure 10 can be cylindrical, cuboid, cube, etc.

[0027] A first top surface 111 is formed on the top of the frame 11, which is the side opposite to the bottom plate 12. The first top surface 111 extends horizontally and has a protrusion 14. The cover 13 is connected to the first top surface 111. The connection between the cover 13 and the first top surface 111 is further away from the battery pack than the protrusion 14. The first top surface 111 is lower than the top surface of the battery 20. The connection between the cover 13 and the first top surface 111 is recessed. A cavity 16 is formed between the top surface of the battery 20 and the outer surface of the cover 13. This cavity 16 provides a channel for the wiring harness to pass through. At the same time, it provides a clearance space for the thermal expansion of the battery 20 and the opening of the explosion-proof valve. In the event of thermal runaway, the ejected material from the battery 20 must first fill this cavity 16 before it can continue to spread outward.

[0028] The protrusion 14 has a first side surface 141 on the side facing the receiving cavity, and the corresponding frame 11 has a second side surface 112 on the side facing the receiving cavity. The first side surface 141 and the second side surface 112 are used to directly or indirectly abut against the battery 20. The first side surface 141 and the second side surface 112 can directly abut against the battery 20, or a buffer pad or heat insulation layer can be provided between the first side surface 141 and the second side surface 112 and the battery 20. By providing the protrusion 14 on the top of the frame 11, it is ensured that the frame 11 and the protrusion 14 together form a sufficient effective support height, so that the force generated by the battery 20 during expansion or displacement can be evenly transmitted, avoiding stress concentration in the contact area between the battery 20 and the top of the frame 11, significantly reducing local stress peaks, thereby reducing safety risks such as battery 20 casing deformation, internal short circuit or thermal runaway, and improving the reliability of the battery pack.

[0029] Furthermore, referring to Figure 8 As shown, in the first direction D1, the minimum dimension of the first side 141 is h1mm, the minimum dimension of the second side 112 is h2mm, and the minimum dimension of the battery 20 is Hmm, satisfying 0.88 ≤ ≤1.12. Specifically, it can be 0.88, 1, 1.02, 1.04, 1.06, 1.08, 1.1 or 1.2. The value can be one of the values ​​listed above, or any value between 0.88 and 1.2.

[0030] The formula value cannot be too small; if If the value of the formula is too small and does not reach the lower limit of the preset range, the support height provided by the first side 141 and the second side 112 is insufficient relative to the height of the battery 20. The point of action of the expansion force of the battery 20 approaches the top edge of the protrusion 14, and the limiting of the battery 20 changes from surface contact to line contact. The local contact pressure increases, which may cause the outer shell of the battery 20 to be recessed, and may then squeeze the electrode inside the battery 20, causing an internal short circuit.

[0031] The formula value cannot be too large; if If the formula value is too large and exceeds the upper limit of the preset range, the height of the protrusion 14 and the side wall of the frame 11 will increase excessively relative to the height of the battery 20. The excessive height of the protrusion 14 will encroach on the effective height of the accommodating cavity, forcing the cover 13 to be raised as a whole or the energy density of the battery pack to decrease, thereby compressing the vertical arrangement space of the whole vehicle.

[0032] By The formula value is kept within a preset range to ensure that safety risks such as battery casing deformation, internal short circuit or thermal runaway are reduced, while also taking into account space utilization and lightweight requirements.

[0033] Furthermore, the ratio of the minimum dimension h1mm of the first side 141 to the minimum dimension h2mm of the second side 112 is limited to a preset range, satisfying 0.42≤h1mm / h2mm≤0.56. Specifically, it can be 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, or 0.56. The value can be one of the aforementioned values ​​or any value between 0.42 and 0.56.

[0034] The formula value of h1mm / h2mm cannot be too small. If the formula value of h1mm / h2mm is too small and does not reach the lower limit of the preset range, the height of the protrusion 14 relative to the frame 11 will be insufficient. If the frame 11 is too high and the height of the protrusion 14 is insufficient, the depth of the cavity 16 formed between the top surface of the battery 20 and the outer surface of the cover 13 will decrease when the cover 13 is fastened. The shielding effect of the protrusion 14 on the connection between the cover 13 and the frame 11 will be weakened, and the thermal runaway ejected material can directly impact the connection between the cover 13 and the frame 11.

[0035] The formula values ​​of h1mm / h2mm cannot be too large. If the formula values ​​of h1mm / h2mm are too large and exceed the upper limit of the preset range, the protrusion 14 will be too high relative to the frame 11. Under the repeated pushing of the battery 20 expansion, it will bend and cannot play a good supporting role. The excessively high protrusion 14 will also encroach on the effective height of the receiving cavity, forcing the cover 13 to be raised as a whole or the energy density of the battery pack to decrease.

[0036] By keeping the formula values ​​of h1mm / h2mm within a preset range, it is ensured that the protrusion 14 can play a good role in resisting and blocking, while also taking into account the requirements of space utilization and lightweighting.

[0037] In the embodiments provided in this disclosure, the minimum dimension h1mm of the first side 141 is limited to a range of 35mm≤h1mm≤45mm. The value of h1mm can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm or 45mm. The value can be the aforementioned listed values ​​or any value between 35mm and 45mm.

[0038] The value of h1mm cannot be too small. If it is too small, the height of the protrusion 14 will be insufficient, and it will not be able to effectively limit the expansion or displacement of the battery 20. When the battery 20 expands, the contact point changes from surface contact to line contact, and the local pressure increases sharply. The outer shell of the battery 20 is easily crushed, which in turn squeezes the electrode and induces an internal short circuit. At the same time, the shielding effect of the protrusion 14 on the connection between the cover 13 and the frame 11 is weakened, and thermal runaway ejected material can directly impact the connection between the cover 13 and the frame 11.

[0039] The value of h1mm should not be too large. If it is too large, the protrusion 14 will be too high and will bend under the repeated pushing of the battery 20 expansion, which will not play a good supporting role. The excessively high protrusion 14 will also encroach on the effective height of the cavity, forcing the cover 13 to be raised as a whole or the energy density of the battery pack to decrease.

[0040] The minimum dimension h2mm of the second side 112 is limited to a range of 70mm≤h2mm≤85mm. The value of h2mm can be 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm or 85mm. The value can be the aforementioned values ​​or any value between 70mm and 85mm.

[0041] The value of h2mm cannot be too small. If it is too small, the effective height of the side wall of the frame will be insufficient, the line of action of the lateral expansion force of the battery will shift upward, and the bending moment at the root of the protrusion 14 will increase. Under the repeated pushing of the battery 20 expansion, it will bend and cannot play a good supporting role. The value of h2mm cannot be too large. If it is too large, it will encroach on the effective height of the receiving cavity, forcing the cover 13 to be raised as a whole or the energy density of the battery pack to decrease.

[0042] The minimum size Hmm of the battery 20 is limited to a range of 90mm≤Hmm≤120mm. The value of Hmm can be 90mm, 95mm, 100mm, 105mm, 110mm, 115mm or 120mm. The value can be one of the values ​​listed above or any value between 90mm and 120mm.

[0043] The value of Hmm cannot be too small. If it is too small, the vertical dimension of the single cell 20 will be too short, and the energy density will decrease. The value of Hmm cannot be too large. If it is too large, the expansion of the single cell 20 will increase, and the required support height of the side wall of the frame 11 and the protrusion 14 will increase accordingly. At the same time, if the single cell 20 is too high, it will force the ground clearance of the whole vehicle to decrease, which is not conducive to the vertical arrangement of the battery pack.

[0044] In the embodiments provided in this disclosure, reference is made to Figure 1 as well as Figure 3 As shown, the outer surface of the battery 20 includes two first outer surfaces 201 spaced apart along the second direction D2 and two second outer surfaces 202 spaced apart along the third direction D3. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other. The extension directions of the first outer surfaces 201 and the second outer surfaces 202 are both parallel to the first direction D1, that is, the first outer surfaces 201 and the second outer surfaces 202 are both perpendicular to the base plate 12. The area of ​​the first outer surface 201 is larger than the area of ​​the second outer surface 202. The first outer surface 201 is the large surface of the battery 20, and the second outer surface 202 is the small surface of the battery 20.

[0045] Multiple batteries 20 are arranged sequentially along a second direction D2. On the second direction D2, the two first outer surfaces 201 of adjacent batteries 20 are positioned opposite each other, with the large faces of the two batteries 20 facing each other. The first side surface 141 and the second side surface 112 face the first outer surface 201. The large face of a battery 20 represents the main direction of its maximum expansion. By arranging multiple batteries 20 sequentially along this direction with adjacent large faces facing each other, the expansion force is transmitted between the batteries 20 in the form of surface pressure after the large faces of adjacent batteries 20 are in contact. This arrangement aligns the main direction of battery expansion with the first side surface 141 and the second side surface 112. When the large face of the outermost battery 20 contacts the first side surface 141 and the second side surface 112, the expansion force maintains a surface distribution, satisfying the requirements for expansion force absorption.

[0046] In the embodiments provided in this disclosure, reference is made to Figure 8 As shown, the protrusion 14 is connected to the first top surface 111 to form a first connecting part 142, and the cover 13 is connected to the first top surface 111 to form a second connecting part 131. The second connecting part 131 can be the area where the lower surface of the cover 13 overlaps with the first top surface 111. After the cover 13 overlaps with the first top surface 111, it is then fixedly connected by bolts. The first connecting part 142 and the second connecting part 131 are arranged along the second direction D2. Along the second direction D2, the minimum gap between the edge of the first connecting part 142 and the edge of the second connecting part 131 is dmm, and the minimum dimension of the first top surface 111 is Wmm, satisfying 0.02≤dmm / Wmm≤0.3. Specifically, the value can be 0.02, 0.05, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28 or 0.3. The value can be one of the values ​​listed above or any value between 0.02 and 0.3.

[0047] The formula value of dmm / Wmm cannot be too small. If the formula value of dmm / Wmm is too small and does not reach the lower limit of the preset range, the edges of the first connecting part 142 and the second connecting part 131 will almost overlap, and the overlapping area of ​​the protrusion 14 and the cover 13 will be too close in the second direction D2. When the protrusion 14 is deformed, the overlapping area of ​​the protrusion 14 and the cover 13 will be pulled, and the heat generated when the battery 20 thermally runs away will be conducted to the box 10 more quickly, and then spread to the entire battery pack.

[0048] The formula value of dmm / Wmm cannot be too large. If the formula value of dmm / Wmm is too large and exceeds the upper limit of the preset range, the first connecting part 142 of the protrusion 14 will be too narrow, which will cause it to bend easily under the repeated pushing of the battery 20 expansion. Stress concentration will be formed at the root of the protrusion 14, and it will occupy too much lateral space of the cavity, resulting in a simultaneous decrease in space utilization.

[0049] By keeping the formula value of dmm / Wmm within a preset range, it is ensured that the protrusion 14 can play a good role in blocking and resisting, while also taking into account the space utilization rate.

[0050] In the embodiments provided in this disclosure, the minimum gap dmm between the edge of the first connecting portion 142 and the edge of the second connecting portion 131 is limited to a range of 1mm ≤ dmm ≤ 15mm. The value of dmm can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm. The value can be specifically the values ​​listed above, or it can be any value between 1mm and 15mm.

[0051] The value of dmm cannot be too small. If it is too small, the first connecting part 142 and the second connecting part 131 will be almost adjacent in the second direction D2, and the thermo-mechanical coupling distance between them will be too short. Once the protrusion 14 warps slightly due to the expansion of the battery 20, its strain zone will directly pull the overlapping edge of the cover 13, increasing the risk of seal failure. At the same time, the high temperature zone of thermal runaway can be quickly conducted to the main body of the box 10 through this narrow gap. The heat diffusion path is significantly shortened, the temperature rise rate of the whole package is accelerated, and the probability of chain thermal runaway is increased.

[0052] The value of dmm cannot be too large. If it is too large, the first connecting part 142 and the second connecting part 131 will be too far apart in the second direction D2. The excessive lateral spacing will encroach on the effective width of the cavity, and the number of batteries 20 will be forced to be reduced, resulting in a simultaneous decrease in space utilization and energy density.

[0053] The minimum dimension Wmm of the first top surface 111 is limited to a range of 40mm≤Wmm≤60mm. The value of Wmm can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm or 60mm. The value can be one of the values ​​listed above or any value between 40mm and 60mm.

[0054] The value of Wmm cannot be too small. If it is too small, the effective width of the first top surface 111 in the second direction D2 will be too narrow, resulting in insufficient lateral space between the protrusion 14 and the cover 13. The first connecting part 142 and the second connecting part 131 will be almost adjacent in the second direction D2, and their thermo-mechanical coupling distance will be too short. Once the protrusion 14 warps slightly due to the expansion of the battery 20, its strain zone will directly pull the overlapping edge of the cover 13, increasing the risk of seal failure. At the same time, the high temperature zone of thermal runaway can be quickly conducted to the main body of the box 10 through this narrow gap, significantly shortening the heat diffusion path, accelerating the temperature rise rate of the entire package, and increasing the probability of chain thermal runaway.

[0055] The value of Wmm cannot be too large. If it is too large, the outward expansion of the top of the enclosure 11 will exceed the necessary limit, the effective width of the battery 20 will be compressed, the number of batteries 20 will be forced to be reduced, and the space utilization and energy density will decrease simultaneously.

[0056] Furthermore, referring to Figure 5 as well as Figure 8As shown, a clearance arc surface 143 is formed on the side of the protrusion 14 facing away from the battery pack. The clearance arc surface 143 smoothly transitions from the first top surface 111 to the top wall of the protrusion 14, and the normal direction of the clearance arc surface 143 changes continuously with the second direction D2. The clearance arc surface 143 reduces the solid thickness of the outer side of the protrusion 14 in advance in the second direction D2, providing clearance space for the installation of the cover 13. Furthermore, when the battery 20 expands and pushes the protrusion 14 to produce a small displacement, the clearance arc surface 143 can make the bending stress continuously distributed along the arc length, reducing the maximum stress at the root of the protrusion 14.

[0057] In the embodiments provided in this disclosure, reference is made to Figure 5 As shown, a cavity 144 is provided inside the protrusion 14, extending along the length of the frame 11. The cavity 144 serves as a weight-reduction hole, reducing the weight per unit length of the protrusion 14 and meeting the requirements for lightweighting. Simultaneously, the cavity 144 allows the protrusion 14 to have a certain elastic deformation. When the expansion force of the battery 20 is transmitted to the first side 141, the protrusion 14 undergoes a certain elastic deformation to reduce the instantaneous impact of the expansion force on the protrusion 14. The cavity 144 can also serve as a shared space for cooling channels or wiring harness channels; this is not limited here.

[0058] In the embodiments provided in this disclosure, reference is made to Figure 5 As shown, along the first direction D1, the first side 141 and the second side 112 are flush. In the orthographic projection of the first direction D1 (the height direction of the battery 20), the first side 141 and the second side 112 are located on the same geometric line, forming a continuous coplanar limiting wall. The direction of the expansion force of the battery 20 at any point in the height direction is always parallel to the normal direction of the limiting wall, which avoids the first outer surface 201 of the battery 20 from slipping under shear force and reduces the risk of the battery 20 casing yielding.

[0059] In one feasible implementation, refer to Figure 4 as well as Figure 6 As shown, the protrusion 14 extends continuously along the length of the frame 11. The protrusion 14 is uninterrupted, forming a continuous reinforcing ridge, making the protrusion 14 a beam with a uniform cross-section. The expansion force applied by the battery 20 is uniformly transmitted along the circumference of the beam, avoiding excessive local stress.

[0060] In another feasible implementation, refer to Figure 7As shown, the protrusion 14 is composed of multiple spaced sub-protrusions 145. The protrusion 14 is decomposed into several sub-protrusions 145, which extend continuously along the length of the frame 11 and are distributed at equal or unequal intervals. A gap is formed between adjacent sub-protrusions 145, and the material in the gap area is removed, reducing the weight per unit length. The gap also allows the protrusion 14 to have a certain circumferential expansion and contraction. When the expansion difference at a single point of the battery 20 is large, the gap can absorb local interference and prevent the entire protrusion 14 from bending.

[0061] Furthermore, since the battery pack has at least two rows of batteries 20, in the third direction D3, the two second side faces 112 of two adjacent batteries 20 are arranged opposite each other. In the second direction D2, the large faces of two adjacent batteries 2021 are opposite each other, and in the third direction D3, the small faces of two adjacent batteries 20 are opposite each other. In the embodiments of this disclosure, the distance between two adjacent sub-bumps 145 is less than the width of a single battery 20. The displacement generated by the large face of the battery 20 during expansion is continuously distributed along the second direction D2. If the distance between two adjacent sub-bumps 145 is less than the width of a single battery 20, the notches of the two sub-bumps 145 may be directly opposite a battery 20, causing that battery 20 to lose the support of the protrusion 14. By limiting the distance between two adjacent sub-bumps 145 to be less than the width of a single battery 20, redundant coverage is provided for errors. Any cross section of the large face of any battery 20 corresponds to at least one sub-bump 145, eliminating alignment errors.

[0062] In one feasible embodiment, the protrusion 14 and the frame 11 are integrally formed. This eliminates the need for subsequent welding, riveting, or bonding processes, removing interface defects caused by separate connections, and creating a continuous streamline at the connection between the protrusion 14 and the frame 11, thereby reducing stress concentration.

[0063] In another feasible embodiment, the protrusion 14 and the frame 11 are separate structures, and the protrusion 14 is fixed to the first top surface 111 by welding, riveting, or bonding. After the protrusion 14 and the frame 11 are formed independently, the protrusion 14 is then connected to the frame 11. When the protrusion 14 fails due to fatigue or impact, it can be partially cut off and re-welded or riveted, without replacing the entire protrusion 14, thus reducing maintenance costs. Furthermore, for battery packs with different energy densities, only protrusions 14 of corresponding height or wall thickness need to be set at corresponding positions, improving flexibility. Existing housing 10 production lines also do not require mold modification, improving platform scalability.

[0064] In the embodiments provided in this disclosure, reference is made to Figure 3As shown, a functional layer 15 is provided between the frame 11 and the battery 20. The functional layer 15 abuts against the first side 141 and the second side 112. The surface of the functional layer 15 can adapt to micro-unevenness, ensuring that the first outer surface 201 of the battery 20 achieves complete surface contact with the first side 141 and the second side 112, and preventing stress concentration.

[0065] The functional layer 15 can be made of EPDM rubber, silicone rubber, polyurethane foam, neoprene rubber, or SiO2 (silica) aerogel composite glass fiber. It serves as a buffer and / or thermal insulation layer. When acting as a buffer, the functional layer 15 converts the expansion force of the battery 20 into recoverable elastic deformation, reducing the instantaneous impact on the protrusion 14. When acting as a thermal insulation buffer, the functional layer 15 can block the high-temperature radiation during thermal runaway of the battery 20, thus delaying the temperature rise of the protrusion 14 and the frame 11.

[0066] Secondly, this disclosure provides an electrical device that includes the aforementioned battery pack.

[0067] By way of example only, electrical equipment 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.

[0068] In addition, electrical equipment can also be used for the storage, conversion, and release of recyclable electrical energy.

[0069] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of this disclosure. The above description is only a preferred embodiment of this disclosure, but this disclosure does not limit the scope of implementation to what is shown in the figures. Any changes made in accordance with the concept of this disclosure, or modifications to equivalent embodiments with equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of this disclosure.

Claims

1. A battery pack, characterized in that, include: The box body includes a frame, a bottom plate, and a cover. In a first direction, the bottom of the frame is fixed to the bottom plate, and the top of the frame is fixed to the cover to enclose and form an accommodating cavity. A battery pack is disposed within the receiving cavity, and the battery pack includes multiple batteries; The top of the frame has a first top surface, and a protrusion is provided on the first top surface. The cover is connected to the first top surface, and the connection between the cover and the first top surface is further away from the battery pack than the protrusion. The protrusion has a first side facing the receiving cavity, and the corresponding frame has a second side facing the receiving cavity. The first and second sides are used to directly or indirectly abut against the battery pack. In the first direction, the minimum dimension of the first side is h1mm, the minimum dimension of the second side is h2mm, and the minimum dimension of the battery is Hmm, satisfying 0.88 ≤ ≤1.

12.

2. The battery pack according to claim 1, characterized in that, The minimum dimension of the first side is h1mm, and the minimum dimension of the second side is h2mm, satisfying 0.42≤h1mm / h2mm≤0.

56.

3. The battery pack according to claim 1, characterized in that, The minimum dimension of the first side is h1mm, the minimum dimension of the second side is h2mm, and the minimum dimension of the battery is Hmm, satisfying 35mm≤h1mm≤45mm, and / or 70mm≤h2mm≤85mm, and / or 90mm≤Hmm≤120mm.

4. The battery pack according to claim 1, characterized in that, The outer surface of the battery includes two first outer surfaces spaced apart along a second direction and two second outer surfaces spaced apart along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The area of ​​the first outer surface is larger than the area of ​​the second outer surface. The first side and the second side face the first outer surface.

5. The battery pack according to claim 1, characterized in that, The protrusion is connected to the first top surface to form a first connecting part, and the cover is connected to the first top surface to form a second connecting part. The first connecting part and the second connecting part are arranged along a second direction. Along the second direction, the minimum gap between the edge of the first connecting part and the edge of the second connecting part is dmm, and the minimum size of the first top surface is Wmm, satisfying 0.02≤dmm / Wmm≤0.

3.

6. The battery pack according to claim 5, characterized in that, The minimum gap between the edge of the first connecting part and the edge of the second connecting part is dmm, and the minimum dimension of the first top surface is Wmm, satisfying 1mm≤dmm≤15mm, and / or 40mm≤Wmm≤60mm.

7. The battery pack according to claim 1, characterized in that, The side of the protrusion facing away from the battery pack has a clearance arc surface.

8. The battery pack according to claim 1, characterized in that, The protrusion has a cavity that extends along the length of the frame.

9. The battery pack according to claim 1, characterized in that, Along the first direction, the first side is flush with the second side.

10. The battery pack according to claim 1, characterized in that, The protrusion extends continuously along the length of the frame.

11. The battery pack according to claim 1, characterized in that, The protrusion is composed of a plurality of spaced sub-protrusions, which extend continuously along the length of the frame.

12. The battery pack according to claim 11, characterized in that, The spacing between two adjacent sub-bumps is less than the width of a single battery.

13. The battery pack according to claim 1, characterized in that, The protrusion and the frame are integrally formed.

14. The battery pack according to claim 1, characterized in that, The protrusion and the frame are separate structures, and the protrusion is fixed to the first top surface by welding, riveting or bonding.

15. The battery pack according to claim 1, characterized in that, A functional layer is provided between the frame and the battery, and the functional layer abuts against the first side and the second side.

16. The battery pack according to claim 15, characterized in that, The functional layer is made of EPDM rubber, silicone rubber, polyurethane foam, neoprene rubber, or SiO2 aerogel composite glass fiber.

17. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-16.

Images