Battery pack and electric device

Abstract

The battery pack and the electric device are provided, the battery pack comprises a box body, a first filling layer, a support and a battery pack. The box body comprises a bottom plate and a frame; the first filling layer is arranged on the bottom plate, and a plurality of first groove portions are arranged on the first filling layer; the support is arranged on the first filling layer, and a plurality of second groove portions are arranged on the support; the battery pack comprises a plurality of batteries, and the battery comprises a pressure relief member. In the first direction, the maximum size of the first filling layer is H, and in the direction parallel to the first reference surface, the shortest distance between the edges of the first groove portion and the edges of the second groove portion is L, and 0.8<=L / H<=5. The present disclosure can ensure better structural strength enhancement effect, and can also avoid affecting the normal exhaust of the pressure relief member by limiting the ratio L / H of the shortest distance L between the edges of the first groove portion and the edges of the second groove portion and the maximum size H of the first filling layer within the range of 0.8-5.

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, battery pack structures typically include a housing consisting of a base plate, a frame, and a cover, as well as battery packs arranged in groups within the housing. As a key structure supporting the battery packs, the housing not only needs to provide sufficient mechanical strength to withstand vibrations and impacts during vehicle operation, but also needs good bottom protection to prevent structural damage or even thermal runaway caused by impacts from external objects such as road debris and protruding obstacles (i.e., "ball strikes").

[0003] Traditional battery pack casings are mostly made of stamped aluminum alloy or steel sheet, with a single-layer flat bottom plate structure, which has limited bending stiffness. Furthermore, to improve battery safety, pressure relief components (such as pressure relief valves or explosion-proof membranes) are installed at the bottom of the battery to release internal pressure in the event of thermal runaway. When the bottom plate is subjected to concentrated loads from below, it is prone to plastic deformation or even cracking, leading to damage to the internal battery pack and failure of the pressure relief components. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery pack and an electrical device to solve the problem of insufficient bottom protection of battery packs in related technologies.

[0005] In a first aspect, this disclosure provides a battery pack, comprising: The housing includes a base plate and a frame, wherein the frame is connected to the base plate to form a receiving cavity together with the base plate; A first filling layer is housed within the receiving cavity, the first filling layer is disposed on the bottom plate, and the first filling layer is provided with a plurality of first grooves; A support member is housed within the receiving cavity. The support member is disposed on the first filling layer. The support member has a plurality of second grooves, each corresponding to a plurality of first grooves. The inner diameter of the second groove is smaller than the inner diameter of the first groove. A battery pack is housed in the receiving cavity and is disposed on the support member. The battery pack includes multiple batteries, each battery including a pressure relief member. Each battery has a bottom end face on the side near the support member, and the pressure relief member is located on the bottom end face. Several pressure relief members correspond one-to-one with several second grooves. In the first direction, the maximum size of the first filling layer is H, and in the direction parallel to the first reference surface, the shortest distance between the edge of the first groove and the edge of the second groove is L. The normal direction of the first reference surface is parallel to the first direction. The units of H and L are both mm, and 0.8≤L / H≤5 is satisfied.

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

[0007] Compared with related technologies, this disclosure improves the structural strength of the battery pack and the ball impact resistance of the base plate by arranging a first filling layer and a support member sequentially between the base plate and the battery pack.

[0008] Meanwhile, since the pressure relief component is directly opposite the second groove, and the second groove is directly opposite the first groove, when a bottom ball strike occurs, the support component provides uniform support around the pressure relief component, avoiding local stress concentration that could cause deformation or premature breakage of the pressure relief component. When the battery experiences thermal runaway and the pressure relief component opens, the first groove and the second groove can form a discharge channel for the ejected material. The ejected material can be discharged sequentially through the first groove and the second groove into the receiving cavity or outside the casing without triggering thermal runaway of adjacent batteries.

[0009] Furthermore, by limiting the ratio L / H between the shortest distance L between the edge of the first groove and the edge of the second groove and the maximum size H of the first filling layer to the range of 0.8-5, a better structural strength enhancement effect can be ensured, while avoiding affecting the normal venting of the pressure relief component. Attached Figure Description

[0010] Figure 1 This is a perspective view of the battery pack provided in one of the embodiments of this disclosure.

[0011] Figure 2 yes Figure 1 The provided 3D view shows the battery pack with the base plate hidden.

[0012] Figure 3 yes Figure 1 A front view of the first infill layer of the provided battery pack.

[0013] Figure 4 yes Figure 1 A front view of the support structure for the provided battery pack.

[0014] Figure 5 yes Figure 1 A front view showing the first filler layer mating with the support member.

[0015] Figure 6 yes Figure 1A stereoscopic view of the provided battery pack from another perspective.

[0016] Figure 7 yes Figure 6 The provided 3D image shows the battery pack in its concealed state.

[0017] Figure 8 yes Figure 7 The provided 3D view shows the battery pack with the adhesive backing hidden.

[0018] Figure 9 yes Figure 8 The provided 3D image shows the battery pack with the second filling layer hidden.

[0019] Figure 10 yes Figure 1 A simplified structural diagram of the provided battery pack.

[0020] Explanation of reference numerals in the attached figures: 10-Box body, 11-Bottom plate, 12-Frame, 13-Cover, 14-Receiving cavity, 141-Battery compartment, 142-Electrical compartment, 15-First space, 16-Third space; 20 - First filling layer, 21 - First groove, 201 - Sub-filling block; 30 - Support member, 31 - Second groove; 40-Battery pack, 41-Battery, 42-Pressure relief component, 43-Second space; 50 - First section of rubber parts; 60 - Second filler layer; 70 - Third filler layer; 80 - Second section of rubber parts; 90 - Adhesive-resistant component; D1 - First direction; D2 - Second direction; D3-Third direction. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 10 As shown, an embodiment of this disclosure provides a battery pack, including a housing 10 and a first filling layer 20, a support member 30, and a battery pack 40 fixed within the housing 10.

[0023] The housing 10 provides external protection and structural support. The housing 10 includes a base plate 11, a frame 12, and a cover 13. The frame 12 is connected to the base plate 11 to form a receiving cavity 14. The receiving cavity 14 includes a battery compartment 141, in which the battery 41 and the first filling layer 20 are housed. In the first direction D1 (in the embodiments provided in this disclosure, the first direction D1 can be defined as the height direction or the plumb line direction of the housing 10), the receiving cavity 14 has an opening on the side away from the base plate 11 to facilitate the assembly of the battery pack 40 or the battery 41. The cover 13 is designed to be detachable or sealable to close the opening and achieve protection and sealing.

[0024] The first filler layer 20 is located on the base plate 11, preferably tightly attached to the inner surface of the base plate 11. The first filler layer 20 can be made of polyurethane foam, which has functions such as cushioning, heat insulation, flame retardancy, and improved structural strength. When the base plate 11 is subjected to impact, it compresses, prolonging the impact time and reducing the peak force. The flame retardant rating of the first filler layer 20 is UL94-V0 to prevent the first filler layer 20 from being ignited in the event of thermal runaway. (Refer to...) Figure 3 As shown, the first filling layer 20 is provided with a plurality of first grooves 21, which are openings that penetrate or partially penetrate the first filling layer 20 along the thickness direction (first direction D1).

[0025] The support member 30 is located on the first filling layer 20. The support member 30 can be a tray or a heat exchange plate, used to support the battery pack 40 and redistribute the load of the battery pack 40 to the filling layer and the base plate 11. (See reference...) Figure 4 as well as Figure 5 As shown, the support member 30 is provided with a number of second grooves 31, which correspond one-to-one with a number of first grooves 21. The second grooves 31 and the first grooves 21 are coaxial to form a pressure relief channel, ensuring that the pressure relief path is continuous.

[0026] Preferably, the inner diameter of the second groove 31 is smaller than the inner diameter of the first groove 21, so that when the pressure relief component releases pressure, it forms a pressure relief channel that first converges and then expands in the airflow direction. The support component 30 improves local rigidity by reducing the aperture. The first filling layer 20 obtains additional expansion space by enlarging the aperture, dispersing the impact force, preventing high-temperature gas from directly scouring the base plate 11, and reducing the thermal deformation of the base plate 11.

[0027] In one feasible implementation, multiple batteries 41 can be assembled into a battery pack 40 and then installed inside the housing 10. In another feasible implementation, multiple batteries 41 can be directly placed inside the housing 10, i.e., there is no need to group the multiple batteries 41 together; the housing 10 is used to fix the multiple batteries 41. The embodiments provided in this disclosure are described using the example of multiple batteries 41 forming a battery pack 40 and then being installed inside the housing 10. The battery pack 40 is located on the support member 30 and includes multiple batteries 41. The batteries 41 can be cylindrical, pouch, or prismatic. The embodiments provided in this disclosure use a prismatic structure for the batteries 41 as an example.

[0028] The battery 41 includes a pressure relief component 42, which can be of various types, such as an explosion-proof valve, a pressure valve, or a vent membrane. The pressure relief component 42 can be made of metals such as aluminum, steel, or copper. Those skilled in the art can choose different types of pressure relief components 42 according to different design requirements and application scenarios; no limitation is made here.

[0029] The battery 41 has a bottom surface on the side near the support member 30, and the pressure relief member 42 is located on the bottom surface. The pressure relief member 42 is arranged downwards, which can make full use of the Z-direction space and reduce the overall height of the battery pack. Several pressure relief members 42 correspond one-to-one with several second slots 31. When the internal pressure of the battery 41 reaches the set burst pressure, the pressure relief member 42 ruptures, and the airflow passes through the second slot 31, the first slot 21 and the receiving cavity 14 in sequence, and finally exits from the preset exhaust port of the housing 10, thereby releasing the internal pressure.

[0030] Reference Figure 10 As shown, in the first direction D1, the maximum dimension of the first filling layer 20 is H, where H is the thickness of the first filling layer 20, i.e., the energy absorption stroke of the first filling layer 20. In the direction parallel to the first reference plane (in the embodiment provided in this disclosure, the normal direction of the first reference plane is parallel to the first direction D1), the shortest distance between the edge of the first groove 21 and the edge of the second groove 31 is L, where both H and L are in mm. The formula value of L / H is preferably within the following range, satisfying 0.8≤L / H≤5. The value can be 0.8, 1, 2, 3, 4, or 5, and can specifically be the values ​​listed above, or any value between 0.8 and 5. By reasonably setting the formula value of L / H and limiting the formula value to a preset range, it can be ensured that the impact load can be fully absorbed by the filling layer, while ensuring that the cross-sectional area of ​​the pressure relief channel is large enough to effectively release the pressure relief.

[0031] If L / H is too small and does not reach the minimum value of the preset range, it means that the first groove 21 and the second groove 31 almost completely overlap, the horizontal offset is very small, the exhaust cross-sectional area is reduced, and the high temperature and high pressure gas cannot be discharged in time during thermal runaway, which can easily lead to thermal runaway.

[0032] If L / H is too large, exceeding the maximum value of the preset range, it means that the horizontal distance between the first groove 21 and the second groove 31 is too large, or the thickness of the first filling layer 20 is too thin and the energy absorption stroke is too short. When the bottom plate 11 is hit by the ball, the impact force generates high stress concentration in the area where the pressure relief component 42 is located, which can easily lead to deformation or premature breakage of the pressure relief component 42.

[0033] In the embodiments provided in this disclosure, Hmm is limited to a preset range of 5mm ≤ Hmm ≤ 15mm. The value can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm. Specifically, the value can be one of the aforementioned values ​​or any value between 5mm and 15mm. By limiting the value of Hmm to a preset range, the structural strength of the battery pack and the ball-impact resistance of the base plate 11 are improved, while ensuring the pressure relief and venting of the pressure relief component 42, without excessively encroaching on the limited space within the housing 10.

[0034] If the value of Hmm is too small and does not reach the minimum value of the preset range, it means that the first filling layer 20 is too thin, the compressible stroke is insufficient, which reduces the structural strength of the battery pack and the ball impact resistance of the base plate 11. At the same time, if the height of the pressure relief channel is too small, the space to accommodate the ejected material is too small, the pressure relief component 42 cannot be completely released, and the risk of thermal runaway increases.

[0035] If Hmm is too large, exceeding the maximum value of the preset range, it means that the first filling layer 20 is too thick, which will encroach on the limited space inside the box 10, reduce the battery 41 arrangement density, reduce energy density, and directly increase the structural weight, which is not conducive to the lightweight design of the whole vehicle.

[0036] In the embodiments provided in this disclosure, Lmm is limited to a preset range of 10mm ≤ Lmm ≤ 30mm. The value can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, or 30mm. Specifically, the value can be one of the aforementioned values ​​or any value between 10mm and 30mm. By limiting the value of Lmm to a preset range, the pressure relief component 42 can be guaranteed, while avoiding a reduction in the structural strength of the battery pack and the ball-impact resistance of the base plate 11.

[0037] If the value of Lmm is too small and does not reach the minimum value of the preset range, it means that the first groove 21 and the second groove 31 are almost concentric, the exhaust cross-sectional area is reduced, and the high temperature and high pressure gas cannot be discharged in time during thermal runaway, which can easily lead to thermal runaway.

[0038] If Lmm is too large, exceeding the maximum value of the preset range, it means that the horizontal distance between the first groove 21 and the second groove 31 is too large, and there is not enough first filling layer 20 under the pressure relief component 42 to disperse the impact load, which reduces the structural strength of the battery pack and the ball impact resistance of the base plate 11, and may also easily lead to deformation or premature breakage of the pressure relief component 42.

[0039] In one feasible implementation, refer to Figure 9 As shown, the batteries 41 are typically arranged in rows along the second direction D2 and / or the third direction D3. The second direction D2 and the third direction D3 are perpendicular to each other. The second direction D2 can also be defined as the length direction of the battery pack, and the third direction D3 is defined as the width direction of the battery pack. The second direction D2 and the third direction D3 together define the first reference surface. The extension direction of the first filling layer 20 is consistent with the arrangement direction of the batteries 41, and it is continuously laid along the arrangement direction of the batteries 41 to reduce the assembly difficulty.

[0040] The orthographic projection of the battery pack 40 in the first direction D1 at least partially falls on the first filling layer 20. Preferably, the orthographic projection of the battery pack 40 in the first direction D1 (i.e., the height direction of the battery 41) falls on the first filling layer 20 and within the gap between two adjacent first filling layers 20. This ensures that all vertical loads and impact loads on the battery pack 40 can be uniformly borne by the first filling layer 20.

[0041] To address the potential misalignment of the first filler layer 20 during manufacturing or use, refer to... Figure 10 As shown, the battery pack includes a first retaining element 50, which can be made of melamine foam and is used to physically constrain the spatial position of the first filling layer 20. The flame retardant rating of the first retaining element 50 is UL94-V0 to prevent the first retaining element 50 from being ignited in the event of thermal runaway.

[0042] The first retaining element 50 is located around the periphery of the first filler layer 20. Here, "periphery" refers to the direction parallel to the first reference surface. The first retaining element 50 surrounds or partially encloses the edge region of the first filler layer 20 to restrict the movement of the first filler layer 20 in the direction parallel to the first reference surface. This ensures that the first filler layer 20 always stably covers the top of the battery pack 40, improving structural consistency and long-term reliability.

[0043] In one feasible implementation, the bottom end of the first adhesive blocking member 50 is connected to the base plate 11, the top end of the first adhesive blocking member 50 is connected to the support member 30, and the first adhesive blocking member 50 includes a portion extending along the second direction D2 and a portion extending along the third direction D3, thereby enclosing a space for accommodating the first filling layer 20.

[0044] In another feasible implementation, refer to Figure 2 as well as Figure 4 As shown, the first filling layer 20 includes multiple mutually spaced sub-filling blocks 201, which are sequentially spaced apart in a direction parallel to the first reference plane. In one feasible embodiment, the directions parallel to the first reference plane are selected as the second direction D2 and the third direction D3, and the multiple sub-filling blocks 201 are sequentially spaced apart along the second direction D2 and the third direction D3, respectively, forming an array distribution. The entire first filling layer 20 is divided into several independent, physically isolated small blocks, thereby reducing the amount of material used in the first filling layer 20, while avoiding tearing of the entire first filling layer 20 due to local thermal expansion or vibration, and also making way for the liquid cooling pipes on the local reinforcing ribs of the base plate 11 or the support member 30.

[0045] Adjacent sub-filling blocks 201 have uniform gaps, forming periodic intervals. (Refer to...) Figure 4 as well as Figure 5 As shown, in one distribution of the sub-filling blocks 201, multiple sub-filling blocks 201 are arranged below a battery pack 40. The gaps between these blocks can connect with a portion of the second groove 31 on the support member 30, thus forming a pressure relief channel. The pressure relief path of this portion of the pressure relief member 42 is that the airflow sequentially passes through the second groove 31, the gap between adjacent sub-filling blocks 201, and the receiving cavity 14, and finally exits from the pre-set exhaust port of the housing 10. In another distribution of the sub-filling blocks 201, the receiving cavity 14 includes multiple mutually separated sub-spaces. Through structures such as longitudinal beams and isolation beams, the entire receiving cavity 14 is physically divided into several independent sub-spaces. Multiple battery packs 40 are provided, and each battery pack 40 is housed within a corresponding sub-space. Multiple sub-filling blocks 201 are also provided, with each sub-filling block 201 corresponding one-to-one with a battery pack 40. Sub-filling blocks 201 are only arranged directly below the battery pack 40, leaving the remaining area empty.

[0046] Preferably, in a feasible embodiment, in the direction parallel to the first reference plane, the direction parallel to the first reference plane is selected as the second direction D2 and the third direction D3. In the second direction D2 and the third direction D3, the minimum distance between two adjacent sub-filling blocks 201 is between 20mm and 80mm. The value can be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or 80mm, and the value can be specifically the values ​​listed above, or any value between 20mm and 80mm. By limiting the value of this distance to a preset range, the structural strength of the battery pack and the ball impact resistance of the base plate 11 are improved, and the pressure relief component 42 can be guaranteed to release pressure, while not excessively encroaching on the limited space inside the casing 10.

[0047] If the minimum spacing is too small and does not reach the minimum value of the preset range, the adjacent sub-filling blocks 201 will be too close together. When the sub-filling blocks 201 expand due to heat, they will come into contact with each other. When the gap between the adjacent sub-filling blocks 201 serves as a pressure relief channel, the exhaust cross-sectional area will be reduced. In the event of thermal runaway, the high-temperature and high-pressure gas cannot be discharged in time, which can easily lead to thermal runaway.

[0048] If the minimum spacing value is too large, exceeding the maximum value of the preset range, the adjacent sub-filling blocks 201 will be too far apart, the corresponding area of ​​the bottom plate 11 will lose the support of the first filling layer 20, and there will be insufficient first filling layer 20 to disperse the impact load directly below the pressure relief component 42, which will reduce the structural strength of the battery pack and the ball impact resistance of the bottom plate 11, and may also easily lead to deformation or premature breakage of the pressure relief component 42.

[0049] Furthermore, referring to Figure 2 As shown, each sub-filling block 201 has a corresponding first baffle 50 on its periphery. Here, "periphery" refers to the direction parallel to the first reference surface. The first baffle 50 surrounds or partially encloses the edge area of ​​the sub-filling block 201 to restrict the movement of the sub-filling block 201 in the direction parallel to the first reference surface. This ensures that the sub-filling block 201 is always stably fixed in the preset area, ensures that the thermal runaway airflow path is unobstructed, and guides it to the preset exhaust port of the housing 10.

[0050] Preferably, the minimum dimension (i.e., thickness) of the first sealing element 50 in the direction parallel to the first reference plane is greater than or equal to 2 mm. In one feasible embodiment, the direction parallel to the first reference plane is selected as the second direction D2 and the third direction D3. In the second direction D2 and the third direction D3, the thickness of the first sealing element 50 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or other values. The values ​​can specifically be the values ​​listed above, or any value greater than or equal to 2 mm. If the thickness of the first sealing element 50 is too small and does not reach the minimum value of the preset range, it means that the first sealing element 50 is too thin, and the adhesive can easily penetrate, affecting the sealing effect.

[0051] In the embodiments provided in this disclosure, in the arrangement direction of the batteries 41, the first filling layer 20 extends beyond the outermost first groove 21, and the horizontal outer contour of the first filling layer 20 protrudes further outward than the edge of the outermost first groove 21. When the base plate 11 is hit by a ball, the impact force diffuses outward through the first filling layer 20. If the outer edge of the first filling layer 20 is flush with the outermost first groove 21, the edge of the first groove 21 will become a stress concentration point, resulting in a sudden drop in local stiffness, making the support member 30 at the first groove 21 easily damaged.

[0052] In the embodiments provided in this disclosure, reference is made to Figures 6 to 9As shown, the housing 10 includes a cover 13. In the first direction D1, the receiving cavity 14 has an opening on the side opposite to the bottom plate 11 to facilitate the assembly of the battery pack 40. The cover 13 is designed to be detachable or sealable to close the opening and achieve protection and sealing.

[0053] The receiving cavity 14 includes a battery compartment 141, in which the battery pack 40 is housed. In the first direction D1, a first space 15 exists between the battery pack 40 and the cover 13. In a direction parallel to the first reference plane, the first space 15 extends to the inner surface of the battery compartment 141. A second filling layer 60 fills a portion of the first space 15. The orthographic projection of the battery pack 40 in the first direction D1 falls on the second filling layer 60. The material of the second filling layer 60 can be a low-density potting compound, etc., and it possesses functions such as buffering, heat insulation, flame retardancy, and improved structural strength, thereby solving the problems of unstable battery 41 fixation and insufficient overall structural strength of the battery pack in related technologies.

[0054] Furthermore, to address the potential displacement of the second filler layer 60 during manufacturing or use, in the embodiments provided in this disclosure, the battery pack includes a second retaining element 80. The second retaining element 80 is made of melamine foam and is used to physically constrain the spatial position of the second filler layer 60. The flame retardant rating of the second retaining element 80 is UL94-V0 to prevent it from igniting in the event of thermal runaway.

[0055] The second retaining element 80 is located around the periphery of the second filler layer 60. Here, "periphery" refers to the direction parallel to the first reference surface. The second retaining element 80 surrounds or partially encloses the edge region of the second filler layer 60 to restrict the movement of the second filler layer 60 in the direction parallel to the first reference surface. This prevents the second filler layer 60 from spreading or overflowing during injection, curing, thermal expansion, or vibration, thereby ensuring that the second filler layer 60 always stably covers the top of the battery pack 40, improving structural consistency and long-term reliability.

[0056] The material of the second-stage adhesive component 80 is selected to allow airflow to pass through. The second-stage adhesive component 80 can be made of open-cell foam or a porous or membrane structure that is breathable but not adhesive-permeable. Taking open-cell foam as an example, the cells are interconnected to form a continuous channel. When the encapsulating adhesive is injected, the air trapped inside or the gas released by the reaction can freely pass through the second-stage adhesive component 80. The air permeability can be adjusted by the pore size and density.

[0057] Preferably, the minimum dimension (i.e., thickness) of the second sealing element 80 in the direction parallel to the first reference plane is greater than or equal to 2 mm. In one feasible embodiment, the direction parallel to the first reference plane is selected as a second direction D2 and a third direction D3. In the second direction D2 and the third direction D3, the thickness of the second sealing element 80 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or other values. These values ​​can specifically be the values ​​listed above, or any value greater than or equal to 2 mm. If the thickness of the second sealing element 80 is too small and does not reach the minimum value within the preset range, it means that the second sealing element 80 is too thin, and the adhesive can easily penetrate, affecting the sealing effect.

[0058] In the embodiments provided in this disclosure, the battery pack includes an adhesive barrier 90, and a second space 43 is provided between adjacent batteries 41. The adhesive barrier 90 covers or closes the second space 43 to prevent adhesive from seeping into the gap between the batteries 41. If the adhesive seeps in, it may cause a short circuit, increased thermal resistance, or obstructed venting.

[0059] In one feasible embodiment, the battery 41 has a top surface on the side near the cover 13. The top surface is the uppermost planar area of ​​the battery 41 along the first direction D1, which provides a continuous, flat, and reliable bonding / welding base for the adhesive resist 90. The adhesive resist 90 is connected to the top surfaces of two adjacent batteries 41 to cover the second space 43. The adhesive resist 90 can be a tape, sheet, or film covering the second space 43. Using tape allows for adhesive bonding to the top surface, eliminating the need for additional fixing steps; using a film / sheet allows for fixing via hot melting, ultrasonic spot welding, or mechanical clips.

[0060] In another feasible implementation, the adhesive blocking component 90 can be foam, preferably made of breathable melamine material, which serves both as an adhesive blocking component and an exhaust channel. The adhesive blocking component 90 is filled into the second space 43 to seal the second space 43. The foam is inserted into the second space 43 in a compressed or free state. The size of the foam can be slightly larger than the width of the second space 43 to achieve a certain interference fit and ensure elastic adhesion.

[0061] By filling the second space 43 with the resist component 90, on the one hand, the adhesive cannot penetrate the resist component 90 into the battery 41. In the event of thermal runaway, the resist component 90 can temporarily absorb / block ejected material and heat, delaying the spread. On the other hand, the resist component 90 can limit the lateral displacement of the battery 41, absorb vibration and shock, and reduce solder joint fatigue.

[0062] In the embodiments provided in this disclosure, reference is made to Figure 10As shown, a third filling layer 70 is provided between the battery pack 40 and the frame 12. The third filling layer 70 fills the lateral space between the outer side of the battery pack 40 and the inner side of the frame 12, providing lateral cushioning to prevent the battery pack 40 from shifting during vibration and impact. At the same time, it can provide a certain degree of thermal insulation to reduce the heat transfer from the battery pack 40 to the frame 12.

[0063] A third space 16 exists between the third filler layer 70 and the cover 13. The third space 16 is the unfilled area between the upper surface of the third filler layer 70 and the inner surface of the cover 13 in the first direction D1. Part of the third space 16 overlaps with part of the first space 15. In a direction parallel to the first reference plane, at least part of the third space 16 is located on the side of the second baffle 80 away from the second filler layer 60. The third space 16 can serve as a venting channel for the second filler layer 60. When the encapsulating adhesive is injected, the air trapped inside or the gas released from the reaction escapes from the second baffle 80 into the third space 16, thereby preventing gas from being trapped and forming pores. The third space 16 can also provide operable space for the wiring on the frame 12.

[0064] In one feasible embodiment, the receiving cavity 14 further includes an electrical compartment 142, which is used to house low-voltage / control components such as BMS, relays, fuses, connectors, and wiring harnesses. The first space 15 and the third space 16 are both located within the battery compartment 141. The third space 16 is connected to the electrical compartment 142, allowing gas to flow from the third space 16 into the electrical compartment 142, increasing the gas storage space to accommodate sufficient gas generated during the preparation of the second filling layer 60 and preventing the formation of pores within the second filling layer 60.

[0065] Secondly, this disclosure also provides an electrical device, which may include the battery pack 40 described above.

[0066] 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.

[0067] In addition, electrical equipment can also be used for the storage, conversion, and release of recyclable electrical energy.

[0068] 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 housing includes a base plate and a frame, wherein the frame is connected to the base plate to form a receiving cavity together with the base plate; A first filling layer is housed within the receiving cavity, the first filling layer is disposed on the bottom plate, and the first filling layer is provided with a plurality of first grooves; A support member is housed within the receiving cavity. The support member is disposed on the first filling layer. The support member has a plurality of second grooves, each corresponding to a plurality of first grooves. The inner diameter of the second groove is smaller than the inner diameter of the first groove. A battery pack is housed in the receiving cavity and is disposed on the support member. The battery pack includes multiple batteries, each of which includes a pressure relief component. Several pressure relief components correspond one-to-one with several second slots. In the first direction, the maximum size of the first filling layer is H, and in the direction parallel to the first reference surface, the shortest distance between the edge of the first groove and the edge of the second groove is L. The normal direction of the first reference surface is parallel to the first direction. The units of H and L are both mm, and 0.8≤L / H≤5 is satisfied.

2. The battery pack according to claim 1, characterized in that, 5mm≤Hmm≤15mm.

3. The battery pack according to claim 1, characterized in that, 10mm≤Lmm≤30mm.

4. The battery pack according to claim 1, characterized in that, The battery pack includes a first baffle located around the first filler layer to restrict movement of the first filler layer in a direction parallel to the first reference surface.

5. The battery pack according to claim 1, characterized in that, The first filling layer includes a plurality of mutually spaced sub-filling blocks, which are arranged sequentially at intervals in a direction parallel to the first reference surface.

6. The battery pack according to claim 5, characterized in that, The minimum spacing between two adjacent sub-filling blocks is between 20mm and 80mm.

7. The battery pack according to claim 5, characterized in that, Each of the sub-filling blocks is provided with a corresponding first sealing element on its periphery. The first sealing element is used to restrict the movement of the sub-filling block in a direction parallel to the first reference surface.

8. The battery pack according to claim 4 or 7, characterized in that, In the direction parallel to the first reference plane, the minimum dimension of the first adhesive barrier is greater than or equal to 2 mm.

9. The battery pack according to claim 1, characterized in that, In the battery arrangement direction, the first filling layer extends beyond the first groove at the outermost edge.

10. The battery pack according to claim 1, characterized in that, The housing includes a cover. In the first direction, the receiving cavity has an opening on the side opposite to the bottom plate, and the cover is used to close the opening. The receiving cavity includes a battery compartment. In the first direction, there is a first space between the battery pack and the cover. In a direction parallel to the first reference plane, the first space extends to the inner surface of the battery compartment. The first space is filled with a second filling layer, and the orthographic projection of the battery pack in the first direction falls on the second filling layer.

11. The battery pack according to claim 10, characterized in that, The battery pack includes a second baffle located around the second filler layer to restrict movement of the second filler layer in a direction parallel to the first reference surface.

12. The battery pack according to claim 11, characterized in that, The second sealing element is made of a breathable material.

13. The battery pack according to claim 11, characterized in that, The battery pack includes an adhesive resist, and there is a second space between adjacent batteries. The adhesive resist covers or closes the second space.

14. The battery pack according to claim 13, characterized in that, A third filling layer is provided between the battery pack and the frame, and a third space is provided between the third filling layer and the cover. Part of the third space overlaps with part of the second space. In the normal direction of the first direction, at least part of the third space is located on the side of the second baffle that is away from the second filling layer.

15. The battery pack according to claim 14, characterized in that, The cavity also includes an electrical compartment, and the third space is connected to the electrical compartment.

16. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-15.

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