Battery pack and electric device

Abstract

The present disclosure provides a battery pack and a power consumption device. The battery pack comprises a box body, a battery pack and a first filling layer. The box body comprises a bottom plate, a frame connected to the bottom plate to form a containing cavity with the bottom plate, and a cover. The battery pack comprises a plurality of batteries. In the first direction, there is a first space between the battery pack and the cover. The first filling layer is filled in the first space. The area of the first filling layer is S1, the area of the battery compartment is S2, and 0.5≤S1 / S2≤0.95. Compared with the related art, the present disclosure significantly improves the overall structural strength of the battery pack under vibration and impact conditions by setting the first filling layer between the battery pack and the cover. By limiting the S1 / S2 formula value of both the area S1 of the first filling layer and the area S2 of the battery compartment, it can be ensured that the first filling layer is fully vented during the pouring or foaming process, avoiding the generation of air holes in the first filling layer, which can cause the first filling layer to crack or delaminate.

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. Because the battery packs are fixed solely by mechanical clamping or a frame, they are prone to displacement and weld breakage under long-term vibration and impact conditions, resulting in insufficient overall structural strength of the battery pack. Utility Model Content

[0003] The purpose of this disclosure is to provide a battery pack and an electrical device to solve the problem of insufficient overall structural strength of battery packs in related technologies.

[0004] In a first aspect, this disclosure provides a battery pack, comprising:

[0005] The housing includes a base plate, a frame, and a cover. The frame is connected to the base plate to form a receiving cavity, which includes a battery compartment. In a first direction, the receiving cavity has an opening on the side opposite to the base plate, and the cover is used to close the opening.

[0006] A battery pack is housed within the battery compartment, the battery pack comprising multiple batteries; in the first direction, there is a first space between the battery pack and the cover, and in a direction parallel to the first reference surface, the first space extends to the inner surface of the battery compartment, the normal direction of the first reference surface being parallel to the first direction;

[0007] A first filling layer fills a portion of the first space, and the orthographic projection of the battery pack in the first direction falls on the first filling layer;

[0008] Wherein, in the first direction, the area of ​​the first filling layer projected onto the first reference surface is S1, and the area of ​​the battery compartment projected onto the first reference surface is S2. The units of S1 and S2 are both mm, and they satisfy 0.5≤S1 / S2≤0.95.

[0009] Secondly, this disclosure provides an electrical device including the aforementioned battery pack.

[0010] Compared with related technologies, this disclosure provides effective support for the battery pack in the height direction by setting a first filling layer between the battery pack and the cover, thereby significantly improving the overall structural strength of the battery pack under vibration and impact conditions. Furthermore, by limiting the ratio S1 / S2 of the area S1 of the first filling layer and the area S2 of the battery compartment to the range of 0.5-0.95, it can ensure sufficient venting of the first filling layer during the filling or foaming process, avoiding the formation of pores within the first filling layer, which could lead to cracking or delamination of the first filling layer and thus reduce the overall structural strength of the battery pack. Attached Figure Description

[0011] Figure 1 This is a perspective view of the battery pack provided in an embodiment of this disclosure.

[0012] Figure 2 yes Figure 1 The provided 3D image shows the battery pack in its concealed state.

[0013] Figure 3 yes Figure 2 The provided 3D view shows the battery pack with the adhesive backing hidden.

[0014] Figure 4 yes Figure 3 The provided 3D image shows the battery pack with the first filling layer hidden.

[0015] Figure 5 This is a schematic diagram of a battery pack in a resistive state using one of its structures.

[0016] Figure 6 This is a schematic diagram of a battery pack with a different structure of resistive adhesive.

[0017] Explanation of reference numerals in the attached figures:

[0018] 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;

[0019] 20-Battery pack, 21-Battery, 22-Top surface, 23-Terminal post, 24-Second space;

[0020] 30 - First fill layer, 31 - Sub-fill block;

[0021] 40 - Second filler layer;

[0022] 50-stop rubber parts

[0023] 60 - Adhesive-resistant component;

[0024] D1 - First direction. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 6 As shown, an embodiment of this disclosure provides a battery pack, including a housing 10 and a battery 21 and a first filling layer 30 fixed inside the housing 10.

[0027] 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 21 and the first filling layer 30 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 20 or the battery 21. The cover 13 is designed to be detachable or sealable to close the opening and achieve protection and sealing.

[0028] The battery 21 can be cylindrical, pouch, or prismatic. The embodiments provided in this disclosure use a prismatic battery 21 as an example. In one feasible embodiment, multiple batteries 21 can be formed into a battery pack 20 and then installed inside the housing 10. In another feasible embodiment, multiple batteries 21 can be directly placed inside the housing 10, i.e., there is no need to group the multiple batteries 21 together; the housing 10 is used to fix the multiple batteries 21. The embodiments provided in this disclosure use multiple batteries 21 forming a battery pack 20 and then installed inside the housing 10 for structural description.

[0029] In the first direction D1, refer to Figure 5 As shown, there is a first space 15 between the battery pack 20 and the cover 13. In a direction parallel to the first reference plane (in the embodiments provided in this disclosure, the normal direction of the first reference plane is parallel to the first direction D1), the first space 15 extends to the inner surface of the battery compartment 141.

[0030] In the embodiments provided in this disclosure, the first filling layer 30 fills a portion of the first space 15, and the orthogonal projection of the battery pack 20 in the first direction D1 falls on the first filling layer 30. The material of the first filling layer 30 can be a low-density potting compound, which has functions such as buffering, heat insulation, flame retardancy and improving structural strength, thereby solving the problems of unstable fixing of the battery 21 and insufficient overall structural strength of the battery pack in the related technologies.

[0031] Preferably, in the first direction D1, the area of ​​the first filling layer 30 projected onto the first reference surface is S1, and the area of ​​the battery compartment 141 projected onto the first reference surface is S2, where both S1 and S2 are in mm. The formula value of S1 / S2 is preferably within the range of 0.5 ≤ S1 / S2 ≤ 0.95. The value can be 0.5, 0.6, 0.7, 0.8, 0.9, or 0.95, specifically the values ​​listed above, or any value between 0.5 and 0.95. By reasonably setting the formula value of S1 / S2 and limiting it to a preset range, the battery pack 20 can be effectively supported, improving the structural strength of the battery pack, while preventing the formation of pores in the first filling layer 30, which could lead to cracking or delamination of the first filling layer 30.

[0032] If S1 / S2 is too small and does not reach the minimum value of the preset range, it means that the first filling layer 30 cannot effectively cover the top of the battery pack 20, there is still a large cavity between the top of the battery pack 20 and the cover 13, the battery pack 20 lacks effective support, the structural strength and buffering performance of the battery pack are insufficient, and under long-term vibration or impact, the battery 21 is prone to displacement, solder fatigue or even breakage, and heat is prone to lateral diffusion during thermal runaway, triggering a chain reaction.

[0033] If S1 / S2 is too large, exceeding the maximum value of the preset range, it means that the coverage area of ​​the first filling layer 30 is too large, and the remaining volume in the battery compartment 141 is greatly compressed. When the encapsulating adhesive (such as low-density potting compound, silicone, etc.) is injected, the air trapped inside or the gas released by the reaction (such as moisture, solvent volatiles) cannot escape effectively, forming a closed microcavity. The gas is trapped and eventually forms pores or voids after the adhesive is cured.

[0034] Furthermore, in order to solve the problem of possible displacement of the first filling layer 30 during the process or use, in the embodiments provided in this disclosure, the battery pack includes a baffle 50, which may be a rib, a retaining wall or a frame, etc., to physically constrain the spatial position of the first filling layer 30.

[0035] The sealant 50 is located around the periphery of the first filler layer 30. Here, "periphery" refers to the direction parallel to the first reference surface. The sealant 50 surrounds or partially encloses the edge area of ​​the first filler layer 30 to restrict its movement in the direction parallel to the first reference surface. This prevents the first filler layer 30 from spreading or overflowing during injection, curing, thermal expansion, or vibration, thereby ensuring that the first filler layer 30 always stably covers the top of the battery pack 20, improving structural consistency and long-term reliability.

[0036] In one feasible implementation, the battery compartment 141 includes multiple mutually separated subspaces. The entire battery compartment 141 is physically divided into several independent subspaces by structures such as longitudinal beams and isolation beams. Multiple battery packs 20 are provided, each battery pack 20 housed within a corresponding subspace. The heat source, current path, and mechanical fixation of the battery pack 20 within each subspace are independent of each other. If thermal runaway occurs in a battery pack 20 within a certain subspace, the ejected material is confined locally, delaying or blocking its spread to adjacent subspaces.

[0037] Reference Figure 3 As shown, the first filling layer 30 includes multiple mutually separated sub-filling blocks 31, which divide the original whole first filling layer 30 into independent small blocks that match the shape of each subspace. The multiple sub-filling blocks 31 correspond one-to-one with the multiple subspaces. Preferably, each subspace contains only one battery pack 20, and each battery pack 20 is covered with a sub-filling block 31 to prevent the entire first filling layer 30 from tearing due to local thermal expansion or vibration. Each sub-filling block 31 can be independently compressed / rebounded to adapt to the small displacement of its respective battery pack 20. When replacing the battery pack 20 in a single subspace, only the corresponding sub-filling block 31 needs to be removed without damaging the overall filling layer.

[0038] Each sub-filling block 31 is provided with a glue-blocking component 50 around its periphery. Each sub-space is independently equipped with a ring of glue-blocking components 50 to prevent the sub-filling block 31 from sliding laterally or overflowing during glue injection, vibration, and thermal cycling. Due to the presence of the glue-blocking components 50, the glue will not flow between adjacent sub-spaces, ensuring uniform filling.

[0039] In the embodiments provided in this disclosure, the adhesive baffle 50 is fitted to the cover 13. In the first direction D1, the top of the adhesive baffle 50 forms a zero-gap contact (the two are just in contact after assembly, with no visible gap) or a slight interference contact (the adhesive baffle 50 is slightly higher than the opening, and slight compression occurs after the cover is closed, improving the sealing and limiting effect). There is no longer a vertical gap between the top of the adhesive baffle 50 and the cover 13 for the adhesive to flow, ensuring that the first filling layer 30 of each subspace is completely isolated. After the adhesive baffle 50 is fitted to the cover 13, it is equivalent to adding a longitudinal support rib under the cover 13, which can significantly reduce the deflection of the cover 13 under vibration or internal pressure and improve the overall resistance to deformation.

[0040] In one feasible implementation, refer to Figure 5As shown, in the first direction D1, the maximum dimension of the sealant 50 is h1. If the sealant 50 is a block structure of uniform thickness, then h1 is the height of the sealant 50. The shortest distance between the battery pack 20 and the cover 13 is L1, which is the shortest vertical distance between the top of the battery pack 20 and the inner surface of the cover 13. The units of h1 and L1 are both mm. In this embodiment, h1 / L1 is limited to a preset range, satisfying 1.5≤h1 / L1≤2. The value can be 1.5, 1.6, 1.7, 1.8, 1.9, or 2. The value can be any value between 1.5 and 2, specifically the values ​​listed above. By reasonably setting the formula value of h1 / L1 and limiting the formula value to a preset range, a reliable sealant function can be achieved, preventing the first filling layer 30 from overflowing, while also preventing the sealant 50 from being crushed or the cover 13 from deforming.

[0041] If h1 / L1 is too small and does not reach the minimum value of the preset range, it means that the glue block 50 is too short. The glue is prone to overturning the glue block 50 during the glue injection or thermal expansion stage, resulting in defects such as glue overflow and glue shortage.

[0042] If h1 / L1 is too large, exceeding the maximum value of the preset range, it means that the sealing part 50 is too high, making it difficult for the cover 13 to close, or even crushing the sealing part 50, which can also easily cause the cover 13 to deform.

[0043] Preferably, the shortest vertical distance L1mm between the top of the battery pack 20 and the inner surface of the cover 13 is limited to the range of 5mm-25mm. L1mm can be 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, 22.5mm, or 25mm, and can be any value within the aforementioned range. The maximum dimension h1mm of the uncompressed adhesive baffle satisfies 8mm ≤ h1mm ≤ 20mm. h1mm can be 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm, and can be any value within the aforementioned range. This design balances adhesive control, structural safety, and process feasibility. When the maximum dimension h1mm of the glue-blocking part 50 is less than 8mm, the glue is prone to overturning the glue-blocking part 50 during the glue injection or thermal expansion stage, resulting in defects such as glue overflow and glue shortage. When the maximum dimension h1mm of the glue-blocking part 50 is greater than 20mm, the glue-blocking part 50 is excessively squeezed, making it difficult for the cover 13 to close, or even crushing the glue-blocking part 50, which can also easily cause the cover 13 to deform.

[0044] The material of the sealing component 50 is selected to allow airflow to pass through. The first filling layer 30 can be selected as open-cell foam or a porous or membrane structure that is breathable but not permeable to adhesive. 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 sealing component 50. The air permeability can be adjusted by the pore size and density.

[0045] In the embodiments provided in this disclosure, reference is made to Figure 5 As shown, in the direction parallel to the first reference plane, i.e., on the horizontal plane, the minimum distance between the adhesive barrier 50 and the frame 12 is L2, where L2 is the shortest distance between the edge of the adhesive barrier 50 and the edge of the frame 12. The minimum dimension of the receiving cavity 14 is W1, where W1 is the minimum inner dimension of the receiving cavity 14 in the horizontal direction, for example, the length of the shorter side inside the frame 12 of the housing 10. The units of L2 and W1 are both mm. In this embodiment, L2 / W1 is limited to a preset range, satisfying 0.005≤L2 / W1≤0.04, where L2mm is limited to the range of 5mm-25mm. The value of L2mm can be 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, 22.5mm, or 25mm, and can specifically be the values ​​listed above, or any value between 5mm and 25mm. W1mm is limited to the range of 600mm-1300mm. The value of W1mm can be 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, 1200mm, or 1300mm. It can be any value within the aforementioned range, or any value between 600mm and 1300mm. By reasonably setting the formula value of L2 / W1 and limiting it to a preset range, the battery pack 20 can be effectively supported, improving the structural strength of the battery pack, while simultaneously creating pores within the first filling layer 30.

[0046] If L2 / W1 is too small and does not reach the minimum value of the preset range, it means that the gap between the adhesive baffle 50 and the frame 12 is too narrow, the remaining volume in the first space 15 is greatly compressed, the gas is trapped in the first filling layer 30, which easily forms pores, and when the adhesive baffle 50 undergoes thermal expansion, it is easy to squeeze the frame 12.

[0047] If L2 / W1 is too large, exceeding the maximum value of the preset range, it means that the first filling layer 30 cannot effectively cover the top of the battery pack 20, there is still a large cavity between the top of the battery pack 20 and the cover 13, the battery pack 20 lacks effective support, the structural strength and buffering performance of the battery pack are insufficient, and under long-term vibration or impact, the battery 21 is prone to displacement, solder fatigue or even breakage, and heat is prone to lateral diffusion during thermal runaway, triggering a chain reaction.

[0048] Furthermore, referring to Figure 5 As shown, in the direction parallel to the first reference plane, the maximum dimension of the adhesive-blocking member 50 is W2, where W2 is the maximum solid width of the adhesive-blocking member 50 on the first reference plane (i.e., the horizontal plane), and the unit of W2 is mm. This embodiment limits W2 / W1 to a preset range, satisfying 0.005 ≤ W2 / W1 ≤ 0.05, where W2mm is limited to the range of 5mm-30mm. The value of W2mm can be 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, 22.5mm, 25mm, 27.5mm, or 30mm, and can specifically be one of the aforementioned values, or any value between 5mm and 30mm. By reasonably setting the formula value of W2 / W1, limiting the formula value to a preset range, both adhesive blocking and positioning can be effectively achieved without occupying excessive space.

[0049] If W2 / W1 is too small and does not reach the minimum value of the preset range, it means that the adhesive barrier 50 is too thin, and the adhesive can still easily be pushed over / penetrated, losing its effective adhesive barrier and limiting function.

[0050] If W2 / W1 is too large, exceeding the maximum value of the preset range, it means that the adhesive baffle 50 occupies too much volume, compressing the remaining volume in the first space 15, causing gas to be trapped in the first filling layer 30, which easily forms pores, and when the adhesive baffle 50 undergoes thermal expansion, it is easy to squeeze the frame 12.

[0051] In the embodiments provided in this disclosure, reference is made to Figures 4 to 6 As shown, the battery pack includes an adhesive barrier 60, and a second space 24 is provided between adjacent batteries 21. The adhesive barrier 60 covers or closes the second space 24 to prevent adhesive from seeping into the gap between the batteries 21. If adhesive seeps in, it may cause a short circuit, increased thermal resistance, or obstructed venting.

[0052] In one feasible implementation, refer to Figure 6 As shown, the battery 21 has a top surface 22 on the side near the cover 13. The top surface 22 is the uppermost planar area of ​​the battery 21 along the first direction D1, and this plane provides a continuous, flat, and reliable bonding / welding base for the adhesive resist 60. The adhesive resist 60 is attached to the top surfaces 22 of two adjacent batteries 21 to cover the second space 24. The adhesive resist 60 can be a tape, sheet, or film covering the second space 24. Using tape allows for adhesive bonding to the top surface 22, eliminating the need for additional fixing steps; using a film / sheet allows for fixing via hot melt, ultrasonic spot welding, or mechanical clips.

[0053] In the embodiments provided in this disclosure, reference is made to Figure 6As shown, the battery includes a terminal post 23 protruding from a top surface 22. The orthogonal projection of the resist member 60 in the first direction D1 falls on the top surface 22 to form a projection area. In the direction parallel to the first reference surface, the minimum size of the projection area is L3, and the minimum distance between the projection area and the terminal post 23 is L4. The units of L3 and L4 are both mm. In this embodiment, L4 / L3 is limited to a preset range, satisfying 0.15≤L4 / L3. If L4 / L3 is too small and does not reach the minimum value of the preset range, it means that the edge of the resist member 60 is in close contact with the terminal post 23. When the assembly tolerance and thermal expansion are insufficient, the resist member 60 is likely to touch the terminal post 23, which may easily cause interference with the terminal post 23, leading to a risk of short circuit or tearing.

[0054] Preferably, the minimum size L3mm of the projection area is limited to the range of 2mm-8mm. L2mm can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or 8mm, and can be any value between 2mm and 8mm. The minimum distance L4mm between the projection area and the pole 23 satisfies 1mm ≤ L4mm. L4mm can be 1mm, 2mm, 3mm, 4mm, 5mm, or other values, and can be any value greater than or equal to 1mm. When the minimum distance L4mm between the projection area and the pole 23 is less than 1mm, the adhesive resist 60 is prone to contacting the pole 23, easily interfering with it and potentially causing a short circuit or tearing risk.

[0055] In another feasible implementation, the adhesive-blocking component 60 can be foam, preferably made of breathable melamine material, serving both as an adhesive-blocking and venting channel. (Refer to...) Figure 5 As shown, the adhesive barrier 60 is filled into the second space 24 to seal the second space 24. The foam is inserted into the second space 24 in a compressed or free state. The size of the foam can be slightly larger than the width of the second space 24 to achieve a certain interference fit and ensure elastic adhesion.

[0056] By filling the second space 24 with the resist component 60, on the one hand, the adhesive cannot penetrate the resist component 60 into the battery 21. In the event of thermal runaway, the resist component 60 can temporarily absorb / block ejected material and heat, delaying the spread. On the other hand, the resist component 60 can limit the lateral displacement of the battery 21, absorb vibration and shock, and reduce solder joint fatigue.

[0057] Furthermore, referring to Figure 5As shown, in the first direction D1, the minimum distance between the resist component 60 and the top surface 22 is L5, where L5 is the shortest vertical distance between the lower surface of the resist component 60 and the top surface 22 of the battery 21. The minimum dimension of the resist component 60 is h2, where h2 is the minimum height of the resist component 60 itself. Both L5 and h2 are in mm. This embodiment limits L5mm and h2mm to within a preset range, satisfying L5mm≤8mm and 5mm≤h2mm≤10mm. L5mm can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or other values, specifically the values ​​listed above, or any value less than or equal to 8mm. h2mm can be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, specifically the values ​​listed above, or any value between 5mm and 10mm. By reasonably setting the values ​​of L5mm and h2mm, the formula value is limited to a preset range, which can effectively prevent adhesive from being stuck and avoid stress concentration.

[0058] If the value of h2mm is too small and does not reach the minimum value of the preset range, it means that the resist 60 is too thin, the adhesive can easily penetrate, and it cannot effectively seal the second space 24. In addition, the resist 60 is far from the top surface 22 of the battery 21, the first filling layer 30 is thickened, and the weight and volume increase.

[0059] If the values ​​of L5mm and h2mm are too large, exceeding the maximum value of the preset range, it means that the adhesive resist 60 is too thick, causing the second space 24 to be occupied too much. The lack of buffer for thermal expansion leads to stress concentration, which can easily cause the cover 13 or battery 21 to deform.

[0060] In the embodiments provided in this disclosure, reference is made to Figure 3 as well as Figure 5 As shown, a second filling layer 40 is provided between the battery pack 20 and the frame 12. The second filling layer 40 fills the lateral space between the outer side of the battery pack 20 and the inner side of the frame 12 of the housing 10, providing lateral cushioning to prevent the battery pack 20 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 20 to the frame 12.

[0061] A third space 16 exists between the second filler layer 40 and the cover 13. The third space 16 is the unfilled area between the upper surface of the second filler layer 40 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 sealant 50 facing away from the first filler layer 30. The third space 16 can serve as a venting channel for the first filler layer 30. When the encapsulating adhesive is injected, the air trapped inside or the gas released from the reaction escapes from the sealant 50 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.

[0062] Reference Figure 5 As shown, in the first direction D1, the minimum dimension of the third space 16 is h3, where h3 is the minimum height from the upper surface of the second filling layer 40 to the inner surface of the cover 13. The minimum dimension of the second filling layer 40 is h4, where h4 is the minimum height of the second filling layer. The units of h3 and h4 are both mm. This embodiment limits h3 / h4 to a preset range, satisfying 0.1 ≤ h3 / h4 ≤ 0.3. The value can be 0.1, 0.15, 0.2, 0.25, or 3, and can specifically be one of the aforementioned values, or any value between 0.1 and 0.3. Limiting the formula value to a preset range provides stable and reliable lateral cushioning while preventing air pockets from forming in the first space 15.

[0063] If h3 / h4 is too small and does not reach the minimum value of the preset range, it means that the third space 16 is too small. When the encapsulating adhesive of the first filling layer 30 is injected, the air trapped inside or the gas released by the reaction cannot escape completely into the third space 16 to form a closed microcavity. The gas is trapped in the first space 15 and eventually forms pores or voids after the adhesive is cured.

[0064] If h3 / h4 is too large, exceeding the maximum value of the preset range, it means that the second filling layer 40 is too thin, making it difficult to provide stable and reliable lateral buffering, and the battery pack 20 is prone to displacement during vibration and impact.

[0065] Preferably, the minimum dimension h3mm of the third space 16 is limited to the range of 10mm-20mm. h3mm can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm, specifically the values ​​listed above, or any value between 10mm and 20mm. The minimum dimension h4mm of the second filling layer 40 satisfies 60mm ≤ h4mm ≤ 90mm. h4mm can be 60mm, 70mm, 80mm, or 90mm, specifically the values ​​listed above, or any value between 60mm and 90mm. This balances exhaust functionality with space utilization. When the minimum dimension h4mm of the second filler layer 40 is less than 60mm, the third space 16 is too small. During encapsulation, the air trapped inside or the gas released from the reaction cannot escape completely into the third space 16, forming a closed microcavity. The gas is trapped and eventually forms pores or voids after the encapsulant cures. When the minimum dimension h4mm of the second filler layer 40 is greater than 90mm, the second filler layer 40 is too thin and cannot provide stable and reliable lateral cushioning. The battery pack 20 is prone to displacement during vibration and impact.

[0066] 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 first filling layer 30 and preventing the formation of pores within the first filling layer 30.

[0067] Secondly, this disclosure also provides an electrical device, which may include the battery pack 20 described above.

[0068] 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.

[0069] In addition, electrical equipment can also be used for the storage, conversion, and release of recyclable electrical energy.

[0070] 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, a frame, and a cover. The frame is connected to the base plate to form a receiving cavity, which includes a battery compartment. In a first direction, the receiving cavity has an opening on the side opposite to the base plate, and the cover is used to close the opening. A battery pack, housed within the battery compartment, comprises multiple batteries; a first space exists between the battery pack and the cover in the first direction; the first space extends to the inner surface of the battery compartment in a direction parallel to a first reference surface, the normal direction of the first reference surface being parallel to the first direction; A first filling layer fills a portion of the first space, and the orthographic projection of the battery pack in the first direction falls on the first filling layer; Wherein, in the first direction, the area of ​​the first filling layer projected onto the first reference surface is S1, and the area of ​​the battery compartment projected onto the first reference surface is S2. The units of S1 and S2 are both mm, and they satisfy 0.5≤S1 / S2≤0.

95.

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

3. The battery pack according to claim 2, characterized in that, The battery compartment includes multiple mutually separated sub-spaces, and multiple battery packs are provided, with each battery pack housed within a corresponding sub-space; The first filling layer includes a plurality of mutually separated sub-filling blocks, each of which corresponds one-to-one with a plurality of sub-spaces, and each of the sub-filling blocks is provided with a sealing member on its periphery.

4. The battery pack according to claim 2, characterized in that, In the first direction, the maximum dimension of the sealing member is h1, and the shortest distance between the battery pack and the cover is L1. The units of h1 and L1 are both mm, and they satisfy 1.5≤h1 / L1≤2.

5. The battery pack according to claim 4, characterized in that, 8mm≤h1mm≤20mm.

6. The battery pack according to claim 2, characterized in that, In a direction parallel to the first reference plane, the minimum distance between the adhesive baffle and the frame is L2, and the minimum size of the receiving cavity is W1. The units of L2 and W1 are both mm, and they satisfy 0.005≤L2 / W1≤0.

04.

7. The battery pack according to claim 2, characterized in that, In the direction parallel to the first reference plane, the maximum dimension of the adhesive barrier is W2, where W2 is in mm, and 0.005≤W2 / W1≤0.

05.

8. The battery pack according to claim 2, characterized in that, The material of the sealing component is a breathable material.

9. The battery pack according to claim 1, 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.

10. The battery pack according to claim 9, characterized in that, The battery has a top surface on the side near the cover, and the adhesive resist is connected to the top surface of two adjacent batteries to cover the second space.

11. The battery pack according to claim 10, characterized in that, The battery includes a terminal post that protrudes from the top surface. The orthographic projection of the resistive component in the first direction falls on the top surface to form a projection area. In the direction parallel to the first reference surface, the minimum size of the projection area is L3, and the minimum distance between the projection area and the terminal post is L4. The units of L3 and L4 are both mm, and 0.15 ≤ L4 / L3 is satisfied.

12. The battery pack according to claim 11, characterized in that, 1mm≤L4mm.

13. The battery pack according to claim 10, characterized in that, The adhesive-resistant component is bonded to the top surface.

14. The battery pack according to claim 9, characterized in that, The adhesive barrier is filled into the second space to seal the second space.

15. The battery pack according to claim 14, characterized in that, The battery has a top surface on the side near the cover. In the first direction, the minimum distance between the adhesive resist and the top surface is L5, and the minimum size of the adhesive resist is h2. The units of L5 and h2 are both mm, and they satisfy L5mm≤8mm and 5mm≤h2mm≤10mm.

16. The battery pack according to claim 1, characterized in that, The battery pack includes a sealant located around the first filling layer. A second filling layer is provided between the battery pack and the frame. A third space is provided between the second filling layer and the cover. Part of the third space overlaps with part of the first space. In the normal direction of the first direction, at least part of the third space is located on the side of the sealant away from the first filling layer.

17. The battery pack according to claim 16, characterized in that, In the first direction, the minimum size of the third space is h3, and the minimum size of the second filling layer is h4. The units of h3 and h4 are both mm, and they satisfy 0.1≤h3 / h4≤0.

3.

18. The battery pack according to claim 17, characterized in that, 60mm≤h4mm≤90mm.

19. The battery pack according to claim 16, characterized in that, The cavity also includes an electrical compartment, and the third space is connected to the electrical compartment.

20. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-19.

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