Battery pack and powered device

Abstract

This invention provides a battery pack and an electrical device, relating to the field of battery technology. The battery pack includes a battery assembly, a support plate, a protective plate, and a first adhesive. The battery assembly is supported on the support plate. The protective plate is located on the side of the support plate opposite to the battery assembly. The battery assembly includes multiple batteries, each battery having a bottom surface facing the support plate. The first adhesive is disposed between the bottom surface of the battery and the support plate for bonding to both. The protective plate has a thickness of a mm, and the first adhesive has a thickness of b mm. The support plate has an area of ​​s1 m². 2 The sum of the bottom areas of the multiple batteries is s² m 2 The ratio s2 / s1 equals s. a, b, and s satisfy: 0.12≤a / (b×s)≤39. By selecting the values ​​of the formula within the reasonable range of 0.12 to 39, the risk of adhesion failure between the battery pack and the support plate is reduced, while the protective plate provides better protection.

Description

Technical Field

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

[0002] In some battery packs, the battery pack is bonded to the support plate using an adhesive. Under operating conditions, vibration and impact can cause this adhesive to fail. If the adhesive fails, the battery pack and support plate will shift relative to each other, which is detrimental to the reliability and safety of the battery pack. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a battery pack designed to solve the problem of adhesion failure between the battery pack and the support plate.

[0004] The battery pack includes a battery assembly, a support plate, a protective plate, and a first adhesive. The battery assembly is supported on the support plate. The protective plate is located on the side of the support plate opposite to the battery assembly. The battery assembly includes multiple batteries, each with a bottom surface facing the support plate. The first adhesive is disposed between the bottom surface of the battery and the support plate to bond them together. The thickness of the protective plate is a mm, and the thickness of the first adhesive is b mm. The area of ​​the support plate is s1 m², and the sum of the areas of the bottom surfaces of the multiple batteries is s2 m². It equals s. a, b, and s satisfy: 0.12 ≤ ≤39.

[0005] By increasing the thickness b of the first adhesive between the support plate and the bottom surface of the battery, and the ratio s of the sum of the areas of the bottom surfaces of multiple batteries s2 to the area s1 of the support plate, the bonding strength between the battery pack and the support plate is ensured, avoiding the risk of the battery pack detaching from the support plate. To address the increased risk of the protective plate easily deforming or even the support plate cracking as a result, that is, to prevent the battery pack from detaching from the support plate while also preventing deformation of the protective plate, the formula is constructed using the thickness a of the protective plate, the thickness b of the first adhesive, and the ratio s of the sum of the areas of the bottom surfaces of multiple batteries s2 to the area s1 of the support plate. The value is limited to 0.12 ≤ Within the reasonable range of ≤39, the bonding strength between the battery pack and the support plate can be improved, ensuring that the risk of bonding failure between the battery pack and the support plate is small, while ensuring that the protective plate provides better protection for the support plate and the battery pack.

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

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

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

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

[0010] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention.

[0011] Figure 2 for Figure 1 Another exploded view of the battery pack.

[0012] Figure 3 For along Figure 1 A schematic partial cross-sectional view taken along line AA.

[0013] Figure 4 for Figure 2 A schematic diagram of the structure of the battery.

[0014] Figure 5 for Figure 4 Another structural diagram of the battery.

[0015] Figure 6 This is a schematic partial cross-sectional view of a battery pack according to another embodiment of the present invention.

[0016] Figure 7 This is a partially enlarged cross-sectional view of a protective plate according to an embodiment of the present invention.

[0017] Figure 8 This is a partially enlarged cross-sectional view of a protective plate according to another embodiment of the present invention.

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

[0019] Figure Labels Battery pack-10; Battery-11; Battery bottom surface 111; First battery side surface-112; Second battery side surface-113; Battery top surface-114; Terminal post-115; Pressure relief valve-116; Housing-20; Beam-21; Side beam-211; Partition beam-212; Side beam connection-213; Side beam body-214; Support plate-22; Plate part-221; Peripheral part-222; Protective plate-23; Body layer-231; Buffer layer-232; Reinforcing layer-233; Housing cover-30; First adhesive-40; Second adhesive-42; Top of second adhesive-42a; Third adhesive-44; Elastic buffer-50; Battery pack-100; Electrical equipment-200. Detailed Implementation

[0020] Previous battery packs had a problem with the adhesion failure between the battery pack and the support plate.

[0021] Research has found that the bonding failure between the battery pack and the support plate is related to the protective plate of the battery pack. The protective plate is located on the side of the support plate facing away from the battery pack, and it protects both the support plate and the battery pack by preventing direct impacts from external objects. To achieve high protection capabilities, the protective plate is usually quite thick. However, when the overall height of the battery pack is limited, to achieve better space utilization and energy density, the thickness of the adhesive is often reduced to compensate for the space occupied by the excessively thick protective plate. This reduction in adhesive thickness weakens the bonding strength between the battery pack and the support plate, leading to bonding failure.

[0022] To address this problem, embodiments of the present invention provide a battery pack. Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and drawings. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the specific structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0023] First, it should be noted that in the embodiments of this invention, "battery" refers to an energy storage device capable of storing and providing electrical energy. Specifically, in the embodiments of this invention, "battery" can refer to an energy storage device capable of repeated charging and discharging, which can be interpreted as a "secondary battery." In the embodiments of this invention, the concept of "secondary battery" can include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, and nickel-metal hydride batteries, etc.

[0024] This invention provides a battery pack 100. (See reference...) Figure 1 The battery pack 100 includes a battery pack 10, a housing 20, and a cover 30. The housing 20 and the cover 30 cooperate to form an internal space for accommodating the battery pack 10. Figure 2 The battery pack 10 includes multiple batteries 11, which can be arranged in multiple battery rows, and the battery rows can be arranged side by side. By way of example only, multiple batteries 11 with similar capacity and internal resistance can be connected in series or in parallel to form the battery pack 10. The housing 20 includes a beam 21, a support plate 22, and a protective plate 23. In some examples, the support plate 22 can be independent of the housing 20. The support plate 22 is located at the bottom of the beam 21 and is used to support the battery pack 10. The protective plate 23 is located at the bottom of the support plate 22, that is, on the side of the support plate 22 facing away from the battery pack 10. In some examples, the protective plate 23 can form the bottom outer surface of the housing 20.

[0025] In this document, the battery pack 100 may include a battery group 10 composed of multiple batteries 11 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 (casing, brackets, etc.), and protective components, etc., and the above components are placed in the housing 20 and sealed by the housing cover 30 to form a complete functional unit that can directly output electrical energy.

[0026] The cover 30 can be used as a sealing component to cover the receiving cavity of the box body 20, encapsulating the battery pack 10 inside the receiving cavity and isolating it from the outside world to prevent external moisture and dust from affecting the battery pack 10.

[0027] The lid 30 can be made of non-metallic materials, such as any polymer compound used as a raw material for processing plastic products, which is called resin. Commonly used resins include polyphenylene sulfide resin (PPS), polyphenylene sulfide resin (PPO), polypropylene resin (PP), etc. Composite materials including reinforcing agents and resins can be used. Commonly used reinforcing agents include glass fiber, carbon fiber, graphite fiber, etc. Metallic materials can also be used, such as iron, aluminum, aluminum alloy, iron alloy, stainless steel, etc.

[0028] The shape of the lid 30 is not specifically limited and can be selected as needed. For example, the lid 30 can be a cuboid.

[0029] The beam 21 is the frame structure of the box 20, serving to support, protect, and connect components. The beam 21 may include multiple side beams 211. For example, the beam 21 may include four side beams 211, which connect end-to-end to form an enclosed space. This enclosed space is sealed by the box cover 30 and the support plate 22 to form a cavity for accommodating the battery pack 10. The beam 21 can be made of various materials, such as aluminum alloy, copper alloy, steel, or plastic. The beam 21 can be rectangular, circular, polygonal, etc., with no specific limitation. The interior of the beam 21 can be a solid structure or contain cavities.

[0030] The support plate 22 is the main load-bearing component of the battery pack 100. It typically refers to a structural component installed at the bottom of the battery pack 100, used to support and secure the battery pack 10, battery management system, and cooling system components inside the battery pack 100. The support plate 22 is mounted on the beam 21. For example, the support plate 22 is fixed to the bottom of the beam 21 by welding, riveting, or screwing. The support plate 22 can be made of various materials, such as high-strength materials like aluminum alloy, steel, and stainless steel. The support plate 22 can be rectangular, circular, polygonal, or a plate-like structure; its specific shape is not limited, and its dimensions are determined by the number of batteries 11 housed in the battery pack 100 and the dimensions of the batteries 11.

[0031] Battery 11 can store chemical energy and controllably convert it into electrical energy. In the recyclable battery 11, the active materials can be reactivated by charging after discharge, allowing it to continue to be used.

[0032] The battery 11 may include a housing and battery cells disposed within the housing.

[0033] For ease of description, this article uses directional indicators such as "top" and "bottom." In this article, "top" refers to a direction perpendicular to the support plate 22 and away from the protective plate 23, and "bottom" refers to a direction perpendicular to the support plate 22 and towards the protective plate 23. For ease of understanding, the top direction is indicated by arrow Z+ and arrow Z- in the accompanying drawings. In addition, another set of opposite directions is indicated by arrows X+ and X-, and another set of opposite directions is indicated by arrows Y+ and Y-, with the three sets of directions being perpendicular to each other.

[0034] To secure battery pack 10, refer to... Figure 2 The battery 11 may also include a first adhesive 40. As a cured adhesive, the first adhesive 40 is used to bond the battery pack 10 to the support plate 22 to fix the battery pack 10 relative to the housing 20. Specifically, refer to... Figures 3 to 5 The battery 11 includes a bottom surface 111 facing the support plate 22, and a first adhesive 40 is disposed between the bottom surface 111 and the support plate 22 to bond with both.

[0035] In this paper, adhesives (first adhesive 40, and second adhesive 42 and third adhesive 44 mentioned below) are used to bond and fix the internal structural components of the battery pack 100. The adhesives possess characteristics of high strength, ability to withstand large loads, aging resistance, fatigue resistance, corrosion resistance, and stable performance throughout their expected lifespan, thereby improving the connection strength between the battery 11 and the housing 20. The adhesive material is an insulating material doped with a conductive medium. The adhesive can use an insulating material as the base material, i.e., a non-conductive adhesive, such as epoxy resin, silicone rubber, polyurethane, etc. The adhesive can also be an epoxy resin structural adhesive or a polyurethane structural adhesive. The adhesive can also be a two-component epoxy resin structural adhesive, a two-component acrylic structural adhesive, a two-component polyurethane structural adhesive, or a two-component silane structural adhesive.

[0036] like Figure 3 As shown, the thickness of the protective plate 23 is a mm, and the thickness of the first adhesive 40 is b mm. In cases of uneven thickness distribution, the component (protective plate 23 or first adhesive 40) can refer to the average thickness of the component. For example, 10 test points can be taken at intervals to test the thickness, and the average value can be taken as the thickness of the component.

[0037] The area of ​​the support plate 22 is s1 m 2The sum of the areas of the bottom surfaces 111 of the multiple batteries 11 is s2 m 2 ,ratio Equal to s. According to the battery 11 provided in the embodiment of the present invention, a, b, and s satisfy: 0.12 ≤ ≤39.

[0038] By increasing the thickness b of the first adhesive 40 between the support plate 22 and the battery bottom surface 111, and the ratio s of the sum of the areas s2 of the bottom surfaces 111 of the multiple batteries to the area s1 of the support plate 22, the bonding strength between the battery pack 10 and the support plate 22 is ensured, avoiding the risk of the battery pack 10 detaching from the support plate 22. To address the increased risk of the protective plate 23 easily deforming or even the support plate 22 cracking, that is, to prevent the battery pack 10 from detaching from the support plate 22 while also preventing the protective plate 23 from deforming, the formula is formed by the thickness a of the protective plate 23, the thickness b of the first adhesive 40, and the ratio s of the sum of the areas s2 of the bottom surfaces 111 of the multiple batteries 11 to the area s1 of the support plate 22. The value is limited to 0.12 ≤ Within the reasonable range of ≤39, the bonding strength between the battery pack 10 and the support plate 22 can be improved, ensuring that the risk of bonding failure between the battery pack 10 and the support plate 22 is small, while ensuring that the protective plate 23 provides better protection for the support plate 22 and the battery pack 10.

[0039] Preferably, the formula The value ranges from 0.33 to 11.5.

[0040] Alternatively, the formula The value can also be 0.5, 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36 or 38, etc.

[0041] The embodiments of the present invention do not impose any particular limitation on the value of 'a'. In some embodiments, the value of 'a' can be selected in the range of 0.5 to 5. Preferably, the value of 'a' can be further selected in the range of 1 to 4. Alternatively, the value of 'a' can also be 1.5, 2, 2.5, 3, 3.5, or 4.5.

[0042] If the value of 'a' is less than 0.5, it indicates that the thickness of the protective plate 23 is too small, resulting in poor protective effect. If the value of 'a' is greater than 5, it will lead to a smaller thickness of the first adhesive 40, resulting in a higher risk of adhesion failure between the battery pack 10 and the support plate 22. By selecting the thickness 'a' of the protective plate 23 within the range of 0.5 to 5, the risk of adhesion failure between the battery pack 10 and the support plate 22 is lower, and the protective effect of the protective plate 23 is better.

[0043] The embodiments of the present invention do not impose any particular limitation on the value of b. In some embodiments, the value of b can be selected in the range of 0.2 to 5. Preferably, the value of b can be further selected in the range of 0.5 to 4. Alternatively, the value of b can also be 1, 1.5, 2, 2.5, 3, 3.5, or 4.5, etc.

[0044] If the value of b is less than 0.2, it indicates that the thickness of the first adhesive 40 is too small, leading to a higher risk of adhesion failure between the battery pack 10 and the support plate 22. If the value of b is greater than 5, it indicates that the thickness of the first adhesive 40 is too large, resulting in a smaller thickness of the protective plate 23 and poorer protective effect. By selecting the thickness b of the first adhesive 40 within the range of 0.2 to 5, the risk of adhesion failure between the battery pack 10 and the support plate 22 is lower, and the protective effect of the protective plate 23 is better.

[0045] The embodiments of the present invention do not impose any particular limitation on the value of s. In some embodiments, the value of s can be selected in the range of 0.6 to 0.9. Preferably, the value of s can be further selected in the range of 0.65 to 0.82. Alternatively, the value of s can also be 0.7, 0.75, or 0.8, etc.

[0046] If the value of s is less than 0.6, the bonding area between the battery pack 10 and the support plate 22 is small, and the risk of bonding failure between the battery pack 10 and the support plate 22 is high. If the value of s is greater than 0.9, the protective effect of the protective plate 23 is poor. By selecting the value of s within the range of 0.6 to 0.9, the risk of bonding failure between the battery pack 10 and the support plate 22 is lower, and the protective effect of the protective plate 23 is better.

[0047] Furthermore, the embodiments of the present invention do not impose any particular limitation on the value of s1. In some embodiments, the value of s1 can be selected in the range of 0.6 to 5.5. Preferably, the value of s1 can be further selected in the range of 1 to 5. Alternatively, the value of s1 can also be 2, 3, or 4.

[0048] Furthermore, the embodiments of the present invention do not impose any particular limitation on the value of s2. In some embodiments, the value of s2 can be selected in the range of 0.4 to 4.5. Preferably, the value of s2 can be further selected in the range of 0.7 to 4. Alternatively, the value of s2 can also be 1, 2, or 3.

[0049] refer to Figure 3 The battery pack 100 may also include a second adhesive 42. In some examples, the second adhesive 42 may be attached to the first adhesive 40. In other examples, the second adhesive 42 may be separated from the first adhesive 40. The second adhesive 42 is located between adjacent batteries 11 and is bonded to the adjacent batteries.

[0050] This structure effectively enhances the fixation of the batteries 11 by placing a second adhesive 42 between adjacent batteries 11 to bond them together. This not only provides stronger adhesive strength but also better suppresses relative displacement between the batteries 11 and the support plate 22 through lateral adhesive constraints when the batteries 11 are subjected to vibration or impact, thereby comprehensively improving the reliability of the adhesive fixation.

[0051] Further reference Figure 3 In the direction perpendicular to the support plate 22, i.e., in the direction indicated by arrows Z+ and Z- in the figure, the distance between the top end 42a of the second adhesive 42 and the bottom surface 111 of the battery is d1 mm. The value range of the distance d1 can satisfy: 4≤d1≤28. Preferably, the value range of the distance d1 can satisfy: 5≤d1≤25. Alternatively, the value of the distance d1 can also be 10, 15, or 20.

[0052] The value of d1 should not be too small or too large. If the value of d1 is too small, i.e., less than 4, it means that the extension of the second adhesive 42 in the height direction is limited, resulting in a limited increase in the effective bonding area, which restricts the increase in bonding strength and thus increases the risk of failure. If the value of d1 is too large, i.e., greater than 28, it means that the second adhesive 42 has excessive and unnecessary extension in the height direction. This not only increases material costs and the overall weight of the battery pack 100, but may also encroach on the space of other critical components inside the battery pack 100. More importantly, excessive extension of the second adhesive 42 in the height direction will restrict the expansion of the battery 11, causing compression of the battery cells during full charging.

[0053] By selecting the distance d1 from the top end 42a of the second adhesive 42 to the bottom surface 111 of the battery within a reasonable range of 4 to 28, it is ensured that the second adhesive 42 effectively wraps around the sidewall of the battery 11 to sufficiently increase the bonding area, thereby improving the resistance to peeling and vibration. At the same time, it avoids excessive and ineffective space occupation, reserving the necessary space for possible expansion of the battery cell. In addition, this also avoids the adverse effects of excessive second adhesive 42 on the heat dissipation of the battery 11.

[0054] refer to Figure 2 The beam 21 may include side beams 211 and partition beams 212. The side beams 211 may be constructed as a rectangular frame surrounding the battery pack 10. The partition beams 212 are surrounded by the side beams 211, dividing the space enclosed by the side beams 211 into multiple smaller spaces, each of which can form a relatively independent battery compartment accommodating a portion of the battery pack 10. For example, the partition beams 212 may be approximately cross-shaped. The beams 211 and / or partition beams 212 may be assembled from multiple components. These components may be hollow profiles. The beams 211 and / or partition beams 212 may also be integrally cast.

[0055] refer to Figure 3 In some embodiments, the side beam 21 can be fixedly connected to the support plate 22. In some examples, the side beam 21 can be fixedly connected to the support plate 22 by welding. In other examples, the side beam 21 can be fixedly connected to the support plate 22 by fasteners, which may include, but are not limited to, screws or rivets. In still other embodiments, the side beam 21 can be fixedly connected to the support plate 22 by multiple methods described above.

[0056] The support plate 22 and the side beam 211 are fixedly connected to form a frame structure with higher integrity and rigidity. Within this frame structure, the side beam 211 not only directly enhances the circumferential and lateral structural strength of the battery pack 100, effectively resisting external compression and collision deformation, but also connects with the support plate 22 and shares the load collaboratively, significantly improving the structural integrity of the entire battery pack 100. This strengthens the lateral constraint and protection of the battery pack 100, providing more reliable overall structural support and protection under complex operating conditions.

[0057] refer to Figure 3 In some embodiments, the side beam 21 can be fixedly connected to the protective plate 23. In some examples, the side beam 21 can be fixedly connected to the protective plate 23 by welding. In other examples, the side beam 21 can be fixedly connected to the protective plate 23 by fasteners, which may include, but are not limited to, screws or rivets. In still other embodiments, the side beam 21 can be fixedly connected to the protective plate 23 by multiple methods described above.

[0058] By fixing the protective plate 23 to the side beam 211, a frame structure with higher integrity and rigidity is formed. Within this frame structure, the side beam 211 not only directly enhances the circumferential and lateral structural strength of the battery pack 100, effectively resisting external compression and collision deformation, but also connects with the protective plate 23 and shares the load collaboratively, significantly improving the structural integrity of the entire battery pack 100. This strengthens the lateral constraint and protection of the battery pack 100, providing more reliable overall structural support and protection under complex operating conditions.

[0059] refer to Figure 3 In some embodiments, the side beam 21 can be fixedly connected to both the support plate 22 and the protective plate 23. In some examples, the side beam 21 can be fixedly connected to the support plate 22 and the protective plate 23 by welding. In other examples, the side beam 21 can be fixedly connected to the support plate 22 and the protective plate 23 by fasteners, which may include, but are not limited to, screws or rivets. In still other embodiments, the side beam 21 can be fixedly connected to the support plate 22 and the protective plate 23 simultaneously by multiple methods described above.

[0060] By fixing the support plate 22 and protective plate 23 to the side beam 211, a frame structure with higher integrity and rigidity is formed. Within this frame structure, the side beam 211 not only directly enhances the circumferential and lateral structural strength of the battery pack 100, effectively resisting external compression and collision deformation, but also connects with the support plate 22 and protective plate 23 to share forces, significantly improving the structural integrity of the entire battery pack 100. This strengthens the lateral constraint and protection of the battery pack 100, providing more reliable overall structural support and protection under complex operating conditions.

[0061] Further reference Figure 3 The second adhesive 42 is also disposed between the side beam 211 and the battery 11 adjacent to the side beam 211 and is bonded to both. That is to say, the second adhesive 42 not only bonds the side of the adjacent battery 11, but also bonds the side of the battery 11 to the side beam 211.

[0062] By also attaching the second adhesive 42 between the side beam 211 and the adjacent battery 11 and bonding them together, the fixing method of the battery pack 10 is expanded from a single bottom surface bonding to a composite bonding of the bottom and side surfaces. This not only significantly increases the effective bonding area but also allows the battery pack 10, the second adhesive 42, and the side beam 211 to form a more integrated composite structure. This composite structure further enhances the bonding strength and significantly improves the battery pack 100's resistance to vibration and impact.

[0063] Continue to refer to Figure 3 In the direction perpendicular to the support plate 22, i.e., in the direction indicated by arrows Z+ and Z- in the figure, the dimension of the side beam 211 is h1 mm, and the dimension of the second adhesive body 42 is h2 mm. The value range of the ratio h2 / h1 of dimension h2 can satisfy: 0.017≤h2 / h1≤0.65. Preferably, the value range of the ratio h2 / h can satisfy: 0.2≤h2 / h1≤0.5. Alternatively, the value of the ratio h2 / h1 can also be 0.3, 0.35, 0.4, or 0.4.

[0064] The ratio h2 / h1 should not be too small or too large. If the ratio h2 / h1 is too small, i.e., less than 0.017, it indicates that the size of the second adhesive body 42 relative to the edge beam 211 in the direction perpendicular to the support plate 22 is too small. This means that the bonding area between the two is insufficient, resulting in insufficient bonding strength. If the ratio h2 / h1 is too large, i.e., greater than 0.65, it indicates that the size of the second adhesive body 42 relative to the edge beam 211 in the direction perpendicular to the support plate 22 is too large. This means that the bonding coverage height of the second adhesive body 42 on the edge beam 211 exceeds the necessary range. This leads to unnecessary consumption, increases material costs and the weight of the battery pack 100, reduces the energy density of the battery pack 100, and adversely affects the heat dissipation of the battery 11.

[0065] By selecting the ratio h2 / h1 within a reasonable range of 0.017 to 0.65, a balance is achieved between bonding efficiency and internal space utilization of the battery pack 100. This ensures that the second adhesive 42 has sufficient height to form an effective bonding area, thus providing reliable fixing strength, while also preventing the second adhesive 42 from being too tall and excessively occupying internal space. Therefore, this structure maximizes the internal space utilization efficiency of the battery pack 100 while ensuring the battery pack 10 is firmly fixed, which is beneficial to improving the overall mass energy density of the battery pack 100 and avoids adverse effects on heat dissipation of the battery 11.

[0066] The value of dimension h1 can range from 30 to 300. Preferably, the value of dimension h1 can range from 80 to 200. Alternatively, the value of dimension h1 can also be 120, 150, or 180.

[0067] The value of dimension h2 can range from 5 to 200. Preferably, the value of dimension h2 can range from 40 to 120. Alternatively, the value of dimension h1 can also be 60, 80, or 100.

[0068] refer to Figure 2 and Figure 3 The support plate 22 may include a plate body 221 and a peripheral portion 222 surrounding the plate body 221. The plate body 221 is located below the battery pack 10 and supports the battery pack 10. For ease of understanding, Figure 2 The plate body 221 and the peripheral portion 222 are schematically divided by a dashed outline. For example... Figure 3As shown, the side beam 211 may include a side beam connecting portion 213, which is located on the side of the peripheral portion 222 facing away from the protective plate 23. The battery pack 100 also includes a third adhesive body 44. The third adhesive body 44 is disposed between the side beam connecting portion 213 and the peripheral portion 222 to bond the side beam connecting portion 213 to the support plate 22. In some embodiments, the third adhesive body 44 is in contact with the first adhesive body 40. In other embodiments, the third adhesive body 44 is spaced apart from the first adhesive body 40.

[0069] This structure optimizes the connection between the side beam 211 and the support plate 22 by setting an overlapping bonding area between the periphery 222 of the support plate 22 and the side beam connection 213, and using a third adhesive 44 to fill and bond in this area. This structure significantly increases the effective connection area between the two. When the battery pack 100 is subjected to impact or vibration, this structure can more evenly transfer the load from the side beam 211 to the entire support plate 22, thereby greatly enhancing the shear and peel resistance of the connection part and improving the overall structural stability of the battery pack 100.

[0070] Understandable, although Figure 3 In the illustrated embodiment, the side beam connection portion 213 is part of the bottom end face of the side beam 211. However, in other embodiments of the present invention, the side beam connection portion 213 may have other structures. Another possible implementation of the side beam connection portion 213 is given below.

[0071] refer to Figure 6 In another embodiment of the present invention, the side beam 211 includes a side beam body 214 and a side beam connecting portion 213, the side beam connecting portion 213 protruding from the inside of the side beam body 214 toward the battery pack 10.

[0072] This construction transforms the connection between the side beam 211 and the support plate 22 from a simple planar fit to an embedded connection with an internal protrusion structure by making the side beam connection 213 protrude from the inner side of the side beam body 214 toward the battery pack 10. This construction significantly increases the actual contact and bonding area between the two, and the protruding side beam connection 213 and the periphery 212 of the support plate 22 form a more stable load transfer path, thereby further enhancing the connection strength between the side beam 211 and the support plate 22.

[0073] Further reference Figure 6 In the direction parallel to the support plate 22 and perpendicular to the side beam body 214, i.e., in the direction indicated by arrows X+ and X- in the figure, the dimension of the side beam connection 213 is w mm. The value range of dimension w can satisfy: 8 ≤ w ≤ 35. Preferably, the value range of dimension w can satisfy: 12 ≤ w ≤ 24. Alternatively, the value of dimension w can also be 14, 18, or 22.

[0074] The value of w should not be too small or too large. If the value of w is too small, i.e., less than 8, it limits the space available for connection. This may weaken the connection strength, reducing the fixing strength between the side beam 211 and the support plate 22. Secondly, the narrow side beam connection 213 provides a limited area, increasing the compressive stress per unit area, which is not conducive to the uniform transfer of load and affects the reliability and durability of the side beam connection 213. If the value of w is too large, i.e., greater than 35, it will encroach on the internal space of the battery pack 100, reducing the energy density of the battery pack 100.

[0075] By limiting the protrusion dimension w of the side beam connection 213 to a reasonable range of 8 to 35, a balance is achieved between connection strength and space utilization efficiency. This ensures that the side beam connection 213 has sufficient dimensions to provide the necessary bonding area and fitting depth, thereby forming a strong and reliable connection; at the same time, it avoids excessive protrusion of the side beam connection 213, which would encroach on the layout space of the battery pack 10. This ensures the energy density of the battery pack 100 while maintaining the connection strength between the side beam 211 and the support plate 22.

[0076] In the current embodiment, battery 11 can be a prismatic battery. That is, battery 11 can be generally rectangular in shape. (See reference...) Figure 4 and Figure 5 In addition to the bottom surface 111, the battery 11 may also include a first battery side surface 112 and a second battery side surface 113. The first battery side surface 112, the second battery side surface 113, and the bottom surface 111 are perpendicular to each other and connected to each other. Figure 2 and Figure 3 From the viewing angle, the bottom surface 111 of the battery is perpendicular to the direction indicated by arrows Z+ and Z-; at the other end of this direction, the battery 11 also includes a top surface 114. In some examples, the two terminals 115 of the battery 11 may be located on the top surface 114.

[0077] The area of ​​the bottom surface 111 of the battery is s3 m 2 The area of ​​the side surface 112 of the first battery is s4 m 2 The area of ​​the side 113 of the second battery is s5 m. 2 s3 > s4 and / or s3 > s5. That is, the area of ​​the bottom surface 111 of the battery is greater than the area of ​​at least one of the first side surface 112 and the second side surface 113 of the battery.

[0078] By making the bottom surface area of ​​battery 11 larger than the area of ​​one or two of its side surfaces, a larger effective bonding area is achieved between a single battery 11 and the support plate 22. This not only directly improves the absolute strength of the bond but also provides a more stable interface with a more uniform stress distribution for load transfer. When battery 11 is subjected to vibration or impact, this structure can significantly reduce the stress acting on the bonding interface, thereby achieving a more reliable and durable bonding and fixing effect in the overall structure of battery pack 100.

[0079] It should be noted that although the battery 11 is a prismatic battery in the above embodiment, in other embodiments of the present invention, the battery 11 may also be a cylindrical battery or other types of batteries.

[0080] In some embodiments, the bottom surface 111 of the battery can be completely covered by the first adhesive 40, thereby achieving a higher bonding strength between the battery 11 and the support plate 22.

[0081] In other embodiments, the bottom surface 111 of the battery may be only partially covered by the first adhesive 40. That is, the bottom surface 111 of the battery has an uncovered area that is at least partially not covered by the first adhesive 40.

[0082] The presence of uncovered areas reduces the bonding area, and due to this reduction, the bonding strength between battery 11 and support plate 22 risks decreasing. To compensate for this strength loss and ensure that the fixation reliability of the two is not weakened, the thickness b of the first adhesive 40 can be specifically selected within a higher range, that is, its value range can be further selected to be 0.4 ≤ b ≤ 5.

[0083] In embodiments where uncovered areas exist, the thickness b of the first adhesive 40 is selected within the range of 0.4 mm to 5 mm. This ensures that the first adhesive 40 can provide sufficient adhesive strength to compensate for the loss caused by the reduction in adhesive area, and also ensures that the first adhesive 40 does not occupy too much internal space of the battery pack 100.

[0084] refer to Figure 5 The battery 11 may also include a pressure relief valve 116. In the event of thermal runaway, high-temperature gas is generated inside the battery 11, causing a rapid increase in internal pressure. The pressure relief valve 116 can rupture under this pressure, i.e., open, creating a channel that allows the high-temperature ejected material to escape, preventing more severe thermal runaway from occurring in the battery 11. In the current embodiment, the pressure relief valve 116 may be located on the bottom surface 111 of the battery. To ensure that the pressure relief valve 116 can open smoothly, it may be located in an uncovered area.

[0085] In this case, since the pressure relief valve 116 is located in the uncovered area, higher requirements are placed on the direct load-bearing and impact resistance of the protective plate 23. To improve the load-bearing and impact resistance, the thickness 'a' of the protective plate is specifically selected within a relatively high range, namely, between 0.8 and 5 mm. This provides targeted bottom protection reinforcement for the battery 11 with the pressure relief valve 16 on its bottom surface 111. If the thickness 'a' is too small, the overall rigidity of the protective plate 23 will be insufficient, making it difficult to effectively resist bottom impacts; if the thickness 'a' is too large, it will cause unnecessary weight gain to the battery pack 100 and excessive encroachment on the bottom. Therefore, optimizing the thickness 'a' of the protective plate 23 within this range can ensure the space utilization rate of the overall structure of the battery pack 100 while meeting the special protection requirements of the pressure relief valve 16 area.

[0086] In embodiments where a pressure relief valve 116 is provided in the uncovered area, the support plate 22 may have an exhaust port, and the support plate 22 and the protective plate 23 may be arranged at intervals to form an exhaust space between them. In the event of thermal runaway, high-temperature ejected material can enter the exhaust space from the pressure relief valve 116 through the exhaust port and ultimately be discharged through the explosion-proof valve of the battery pack 100. Further, the battery pack 100 may also include a protective sheet that covers the exhaust port. In the event of thermal runaway, the high-temperature ejected material from the target battery 11 breaks through the corresponding portion of the protective sheet, while the protective sheet portions corresponding to other batteries 11 can protect the pressure relief valve 116 of the corresponding battery 11, preventing crosstalk. For example, the protective sheet may be a mica sheet.

[0087] It is understood that in other embodiments of the present invention, the pressure relief valve 116 may also be provided on other surfaces of the battery 11. By way of example only, in some embodiments, the pressure relief valve 116 may be provided on the top surface 114 of the battery and between the two terminals 115.

[0088] In some embodiments, the support plate 22 can be a heat exchange plate, which, in addition to supporting the battery pack 10, also serves a heat exchange function. Under cold conditions, the support plate 22 can transfer heat to the battery pack 10 to ensure that the battery pack 10 operates at a suitable temperature. When the battery pack 10 is at a high temperature, the support plate 22 can remove heat from the battery pack 10 to prevent temperature runaway. In some examples, the support plate 22 can be a flow channel plate with internal channels for the flow of heat exchange medium. In other examples, the support plate 22 can provide a phase change chamber for a direct cooling / heating system.

[0089] In other embodiments, the support plate 22 may serve only a supporting function and not as a heat exchange plate.

[0090] The present invention does not impose any particular limitations on the material and structure of the protective plate 23, as long as it can provide sufficient protection. Examples of the material and structure of the protective plate 23 are given below.

[0091] In one embodiment of the present invention, reference is made to... Figure 7 The protective panel 23 may include a body layer 231 and a buffer layer 232 laminated on at least one side thereof. The body layer 231 may be at least partially made of steel, while the buffer layer 232 may be at least partially made of polyvinyl chloride.

[0092] By employing a protective plate composed of a steel body layer 231 and a polyvinyl chloride (PVC) buffer layer 232, a systematic improvement in bottom protection performance is achieved. The steel body layer 231 provides the main strength support, while the layered PVC buffer layer 232 effectively absorbs and disperses the instantaneous impact energy during bottom impacts. This composite structure significantly reduces the direct transmission of impact stress to the body layer 231, thereby preventing the body layer 231 from cracking due to plastic deformation. Ultimately, this ensures that the bottom of the battery pack 100 maintains its structural integrity during a collision, ensuring the safety of the battery 11 and the reliable use of the battery pack 100.

[0093] Continue to refer to Figure 7 The thickness of the protective plate 23 is t1 mm, and the thickness of the buffer layer 232 is t2 mm. The ratio of thicknesses t2 and t1, t2 / t1, can be within the range of 0.09 ≤ t2 / t1 ≤ 0.4. Preferably, the range of t2 / t1 can be 0.15 ≤ t2 / t1 ≤ 0.3. Alternatively, the ratio t2 / t1 can also be 0.2, 0.24, or 0.28, etc.

[0094] By selecting the ratio t2 / t1 of the thickness t2 of the buffer layer 232 to the total thickness t1 of the protective plate 23 within the range of 0.09 to 0.4, the two core functions of buffer energy absorption and structural support are synergistically optimized. If the value of this ratio t2 / t1 is too small, i.e., greater than 0.4, it means that the thickness t2 of the buffer layer 232 is too small, and its material cannot fully collapse to absorb and disperse impact energy, and the buffering effect will be significantly weakened. Conversely, if the value of the ratio t2 / t1 is too large, i.e., the thickness t2 of the buffer layer 232 is too large, it will inevitably lead to insufficient thickness of the main body layer 231, which is the main load-bearing component, and its overall stiffness and bending strength will decrease, making it difficult to resist continuous deformation after a collision. Therefore, by controlling t2 / t1 within this range, the main body layer 231 has sufficient strength to maintain the overall structural stability, while ensuring that the buffer layer 232 has the necessary thickness to play an effective energy absorption role, thus achieving the best balance between impact resistance and structural rigidity of the protective plate 23.

[0095] The thickness t1 can range from 0.5 to 4. Preferably, the thickness t1 can range from 1 to 3. Alternatively, the thickness t1 can also be 1.5, 2, or 2.5.

[0096] The thickness t2 can range from 0.3 to 1.4. Preferably, the thickness t2 can range from 0.5 to 1.2. Alternatively, the thickness t1 can also be 0.6, 0.8, or 1.

[0097] Continue to refer to Figure 7 The thickness of the body layer is t3 mm. The value of thickness t3 can be in the range of 0.2 ≤ t3 ≤ 3. Preferably, the value of thickness t3 can be in the range of 1 ≤ t3 ≤ 2. Alternatively, the value of thickness t3 can also be 1.2, 1.6, or 1.8 mm, etc.

[0098] By selecting the thickness t3 of the body layer 231 of the protective plate 23 within the range of 0.2 to 3, a crucial guarantee is provided for the core load-bearing structure. If the thickness t3 is too small, i.e., less than 0.2, the stiffness and strength of the body layer 231, as the main load-bearing structure, will be insufficient to effectively resist bottom impact, which may lead to plastic deformation or even breakage, directly endangering the safety of the battery 11. Conversely, if the thickness t3 is too large, i.e., greater than 3, although the protective capability can be improved, it will cause an unnecessary increase in weight and excessive space occupation of the protective plate 23 and the battery pack 100, thus squeezing the layout space of the battery 11. Therefore, selecting the thickness t3 within the range of 0.2 to 3 can ensure that the protective plate 23 has sufficient mechanical strength while taking into account the needs of internal space distribution.

[0099] Continue to refer to Figure 7 The buffer layer 232 may be located at least on the side of the body layer 231 opposite to the battery pack 10.

[0100] By providing a buffer layer 232 on the side of the main body layer 231 facing away from the battery pack 10, the buffer layer 232 constitutes the first contact surface of the protective plate to resist external impacts. This layering arrangement allows the buffer layer 232 to directly cope with and absorb local impact energy from the bottom. Especially for impacts such as ball strikes, the buffer layer 232 can effectively disperse stress through its own deformation, preventing the impact force from being concentrated on the main body layer 231 and causing it to undergo instantaneous plastic deformation or breakage. This significantly improves the protective plate 23's ability to protect against local impacts, thereby more reliably protecting the bottom of the battery pack 100.

[0101] In some embodiments, the carbon content of the steel in the body layer 231 is N, where N ≥ 0.04. In this case, the thickness 'a' of the protective plate 23 can be selectively reduced, i.e., it can be selected within the range of 0.5 to 4.6.

[0102] By limiting the carbon content N of the steel in the main body layer 231 to no less than 0.04 and selecting the total thickness a of the protective plate 23 within the range of 0.5 to 4.6, a joint optimization of material properties and structural dimensions is achieved. The higher carbon content enhances the strength and hardness of the steel itself, allowing for a smaller lower limit for the thickness a while maintaining the same protective performance. This further reduces the space occupied by the protective plate 23, thereby further ensuring the bonding strength between the battery pack 10 and the support plate 22. Furthermore, this structure, while ensuring sufficient mechanical strength for the protective plate 23, allows for a reduction in the thickness of the protective plate 23, lowering the overall weight and material cost of the battery pack 100 by using higher-strength materials, thus balancing safety and lightweight requirements.

[0103] In another embodiment of the invention, reference Figure 8 The protective panel 23 may include a body layer 231 and a reinforcing layer 233 laminated on at least one side thereof. The body layer 231 is at least partially made of steel, while the reinforcing layer 233 may be at least partially made of polyurea.

[0104] By constructing a reinforcing layer 233 containing polyurea on at least one side of the steel body layer 231, the overall protective performance of the protective plate 23 is significantly improved. The high elasticity, high wear resistance, and tear resistance of the polyurea material allow the reinforcing layer 233 to directly withstand and effectively dissipate impact energy from road surface friction and gravel impacts. Especially against concentrated loads such as ball impacts, the reinforcing layer 233 can avoid brittle fracture through elastic deformation. This structure not only protects the surface of the steel body layer 231 from scratches and corrosion but also mitigates the transmission of impact stress to the internal structure through the material's inherent damping properties, thereby synergistically enhancing the reliability and durability of the protective plate 23 in resisting bottom impacts and preventing self-damage.

[0105] Continue to refer to Figure 8 The thickness of the reinforcing layer 233 is t4 mm. The value range of the thickness t4 can satisfy: 0.5≤t4≤3.6. Preferably, the value range of the thickness t4 can satisfy: 1.2≤t4≤2.4. Alternatively, the value of the thickness t4 can also be 1.4, 1.8, or 2.2, etc.

[0106] If the thickness t4 is too small, less than 0.5, it indicates that the reinforcing layer 233 is too thin and cannot provide sufficient wear resistance and impact resistance for the main body layer 231, thus significantly reducing the overall protective effect of the protective plate 23. If the thickness t4 is too large, greater than 3.6, it indicates that the reinforcing layer 233 is too thick, causing unnecessary weight increase and excessive space occupation for the protective plate 23 and the battery pack 100, thereby encroaching on the layout space of the battery pack 11. By selecting the thickness t4 within the range of 0.5 to 3.6, it is ensured that the reinforcing layer 233 can play an effective role in wear resistance and impact resistance protection, while avoiding unnecessary increases in weight and cost, and avoiding unnecessary space occupation.

[0107] Continue to refer to Figure 8 The protective plate 23 may include two reinforcing layers 233, which may be respectively disposed on opposite sides of the main body layer 231.

[0108] By setting reinforcing layers 233 on opposite sides of the main body layer 231, a symmetrical composite sandwich structure is formed, thereby achieving a synergistic improvement in the overall performance of the protective plate 23. The two reinforcing layers 233 not only share the risks of impact, friction, and corrosion from the bottom and top, significantly improving the comprehensiveness and reliability of the protection, but their symmetrical structure also significantly enhances the overall rigidity and dimensional stability of the protective plate 23, more effectively suppressing bending deformation caused by unilateral stress. Furthermore, the wrapping of the core main body layer 231 by the two reinforcing layers 233 further optimizes the uniformity of stress distribution, extending the service life of the protective plate 23 under complex working conditions.

[0109] Please return Figure 3 In the direction perpendicular to the support plate 22, i.e., in the direction indicated by arrows Z+ and Z- in the figure, the distance between the support plate 22 and the protective plate 23 is d2 mm. The value range of the distance d2 can satisfy: 1≤d2≤15. Preferably, the value range of the distance d2 can satisfy: 4≤d2≤10. Alternatively, the thickness t4 can also be 5, 7, or 9, etc.

[0110] By spacing the support plate 22 and the protective plate 23, and limiting the spacing d2 to the range of 1 to 15, a synergistic optimization of buffering performance and space utilization efficiency is achieved. This spacing provides the protective plate 23 with the necessary deformation space when subjected to impact, allowing it to absorb some impact energy through displacement and deformation. If the spacing d2 is too small, i.e., less than 1, the deformation space of the protective plate 23 is insufficient, and the buffering effect will be significantly weakened; if the spacing d2 is too large, i.e., greater than 15, the overall height of the battery pack 100 will be unnecessarily increased, resulting in a decrease in space utilization in the height direction. By selecting the spacing d2 within the range of 1 to 15, the overall compactness of the battery pack 100 can be maintained while ensuring that the protective plate 23 has effective buffering capacity.

[0111] Continue to refer to Figure 3 The battery pack 100 may also include an elastic buffer 50, which may be disposed between the support plate 22 and the protective plate 23. When the protective plate 23 is subjected to bottom impact deformation, the elastic buffer 50 can provide deformation space and appropriate support to the protective plate 23 through elastic deformation. Furthermore, the elastic buffer 50 can also absorb impact and vibration, reducing the transmission of impact and vibration to the support plate 22, thereby reducing the risk of cracking of the support plate 22 and protecting the battery 11.

[0112] The embodiments of the present invention do not impose any particular restrictions on the material of the elastic buffer 50, as long as it can provide appropriate elastic cushioning. For example, the material of the elastic buffer 50 may be, but is not limited to, polyurethane foam or silicone foam.

[0113] The shape of the elastic buffer 50 is not particularly limited in the embodiments of the present invention. In some embodiments, the elastic buffer 50 may have a pad-like structure parallel to the support plate 22. In other embodiments, the elastic buffer 50 may be elongated, and multiple elastic buffers 50 are arranged at intervals between the support plate 22 and the protective plate 23. In other embodiments, the elastic buffer 50 may be block-shaped, and multiple buffers 50 may be arranged in rows and columns between the support plate 22 and the protective plate 23.

[0114] Continue to refer to Figure 3 The thickness of the elastic buffer 50 is t5 mm. The value of the thickness t5 can satisfy: 1≤t5≤15. Preferably, the value of the thickness t5 can satisfy: 4≤t5≤10. Alternatively, the value of the thickness t5 can also be 5, 7, or 9, etc.

[0115] By setting the elastic buffer 50 and selecting its thickness t5 within the range of 1 to 15, the balance between its buffering performance and space occupation is precisely controlled. If the thickness t5 is too small, i.e., less than 1, the compressible stroke and material amount of the elastic buffer 50 are insufficient, resulting in limited ability to absorb impact energy and a significantly weakened buffering effect. If the thickness t5 is too large, it will excessively increase the overall distance between the support plate 22 and the protective plate 23, unnecessarily raising the total height of the battery pack 100, thereby reducing space utilization. By selecting the thickness t5 within the range of 1 to 15, it is possible to ensure that the elastic buffer 50 plays an effective role in vibration isolation and energy absorption, while maintaining the compactness of the overall structure of the battery pack 100.

[0116] In some embodiments, the hardness of the protective plate 23 may be greater than the hardness of the support plate 22, and / or the thickness of the protective plate 23 may be greater than the thickness of the support plate 22.

[0117] By making the hardness of the protective plate 23 greater than that of the support plate 22, and / or making the thickness of the protective plate 23 greater than that of the support plate 22, differentiated performance selection is implemented for structural components with different functions in the battery pack 100, enhancing protective capabilities. As the first line of defense directly resisting bottom impacts, the higher hardness of the protective plate 23 effectively resists scratches, dents, and foreign object intrusion, while its greater thickness provides higher section modulus and bending stiffness, thus significantly improving resistance to impact deformation. Meanwhile, the support plate 22 can focus on providing a stable bearing surface and adhesive substrate for the battery pack 10. This makes the entire battery pack 100 bottom plate structure more efficient in terms of material and space allocation, systematically enhancing the overall protective performance of the bottom area.

[0118] In addition, the battery pack 100 may also include a thermal management system, a battery management system, and an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), which are also housed within the internal space, working together with other components to form a complete functional unit capable of directly outputting electrical energy. Multiple batteries 11 can be connected in series to form a battery pack, or multiple batteries 11 can be connected in parallel to form a battery pack, or multiple batteries 11 can be partially connected in series and partially connected in parallel to form a battery pack 10. For example, the battery pack 100 may also include conductive elements (not shown). These conductive elements can electrically connect the terminals of at least two batteries 11, i.e., the output terminals of the battery current, to realize the series or parallel connection of multiple batteries 11. The battery pack 100 may also include a busbar, through which the battery management system can be electrically connected to the battery pack 10 to monitor and regulate the charging and discharging process of the battery pack 10.

[0119] This invention also provides an electrical device that may include the battery pack 100 described above. In this document, the electrical device may be, but is not limited to, a vehicle, ship, aircraft, household appliance, or industrial equipment. The vehicle referred to herein may include, but is not limited to, passenger cars, trucks, and engineering vehicles. Furthermore, the electrical device of this invention may also be an energy storage system for storing, converting, and releasing recyclable electrical energy.

[0120] Electrical equipment according to a non-limiting embodiment of the present invention Figure 9 As shown in the image. (Reference) Figure 9 The electrical equipment can be an electric vehicle 200, which may include the aforementioned battery pack 100. In the electric vehicle 200, the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0121] The following specific embodiments and comparative examples are provided to illustrate how the battery pack provided by the present invention helps reduce the risk of adhesion failure between the battery pack and the support plate and improves the protective effect of the protective plate.

[0122] I. Battery Manufacturing Methods (1) Preparation of the positive electrode: The prepared positive electrode active material, conductive agent (e.g., acetylene black), and binder (e.g., PVDF) are mixed, and solvent NMP is added. The mixture is stirred under vacuum until the system is homogeneous to obtain a positive electrode slurry. The positive electrode slurry is uniformly coated on both surfaces of the positive electrode current collector foil, dried at room temperature, and then transferred to an oven for further drying. The positive electrode sheet is then obtained by rolling and slitting.

[0123] Specifically, the mass ratio of positive electrode active material: conductive agent: binder satisfies (92~98): (4~1): (4~1).

[0124] (2) Preparation of negative electrode: The negative electrode active material, conductive agent (e.g., acetylene black), thickener (e.g., carboxymethyl cellulose (CMC)), and binder (e.g., styrene-butadiene rubber (SBR)) are mixed, and deionized water is added as a solvent. The mixture is stirred under vacuum until the system is homogeneous to obtain a negative electrode slurry. The negative electrode slurry is uniformly coated on both surfaces of the negative electrode current collector foil, air-dried at room temperature, and then transferred to an oven for further drying. Finally, the negative electrode sheet is obtained by rolling and slitting.

[0125] Specifically, the ratio of negative electrode active material: conductive agent: thickener: binder satisfies (90~96): (4~2): (2~1): (4~1).

[0126] (3) Preparation of electrolyte: Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed in a volume ratio of 1:1:1 to obtain an organic solvent. Then, fully dried lithium salt LiPF6 was dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0127] (4) Preparation of the diaphragm: Polyethylene film is selected as the diaphragm.

[0128] (5) Preparation of lithium-ion batteries: The positive electrode, separator, and negative electrode are stacked in sequence and wound to form a battery cell. After welding the tabs of the battery cell to the terminal assembly, it is placed in the battery casing, and the cover plate is welded to the casing. The battery is dried, injected with electrolyte, and then packaged, left to stand, formed, and volume-adjusted to obtain a lithium-ion battery.

[0129] In the selection of materials for the aforementioned battery, this application may also select other materials, not limited to those limited by the above preparation method. The positive electrode active material may be selected from one or more lithium-containing positive electrode active materials, including lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. The conductive agent in the positive electrode sheet may also be selected from one or more of graphite, superconducting carbon, Ketjen black, Super P, carbon nanotubes, graphene, and carbon nanofibers. The binder in the positive electrode sheet may also be selected from one or more of polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene ternary copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene ternary copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate resin, styrene-butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, and carboxymethyl chitosan. The positive electrode current collector may also be selected from one or more of stainless steel with silver plating, stainless steel, aluminum, nickel, carbon electrode, carbon, nickel, and titanium. The positive electrode current collector may also include a composite current collector, which may include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming metallic materials (aluminum, aluminum alloys, copper, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer substrate (such as a substrate of polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene, etc.).

[0130] The negative electrode active material can be selected from one or more of the following negative electrode active main materials: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.; the conductive agent in the negative electrode sheet can be selected from one or more of the following: conductive carbon black, conductive graphite, carbon nanotubes, graphene, carbon fiber, etc.; the binder in the negative electrode sheet can be selected from one or more of the following: styrene-butadiene rubber, polyacrylic acid and its salts, sodium alginate, etc.; the thickener in the negative electrode sheet can be selected from one or more of the following: sodium carboxymethyl cellulose, polyacrylonitrile multi-component copolymer, etc.; the negative electrode current collector can also be selected from one or more of the following: stainless steel with silver plating, stainless steel, copper, nickel, carbon electrode, carbon, nickel, titanium, etc.; the negative electrode current collector can also include composite current collectors, which can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene, etc.). The negative electrode active layer includes the negative electrode active material, conductive components, adhesives, etc.

[0131] II. Battery Pack Manufacturing Method According to the above battery preparation method, 200 corresponding batteries are prepared and stacked in the cavity formed by the frame and the support plate. The batteries are then bonded and fixed to the support plate. The protective plate is placed below the support plate, and the lower surface of the frame is fixedly connected to the support plate with fasteners to prepare the battery pack.

[0132] III. The tests involved in the following examples and comparative examples can be performed using the following methods.

[0133] 1. Test method for a: The thickness of the protective plate was measured using a micrometer (accuracy 0.01 mm). The measurement was taken three times, and the average value was recorded as a mm.

[0134] 2. Test method for b: The thickness of the first adhesive body was measured using a micrometer (accuracy 0.01 mm). The measurement was taken three times, and the average value was recorded as b mm.

[0135] 3. Test method for s: The area of ​​the support plate surface is measured and denoted as s1 m. 2 Measure the area of ​​the bottom of each battery and calculate the sum of the areas of the bottom surfaces of all batteries, denoted as s²m. 2 Calculate the ratio of the sum of the areas of all battery bottom surfaces to the area of ​​the support plate, s2 / s1, and denote it as s.

[0136] IV. The performance tests involved in the following examples and comparative examples can be performed in the following manner.

[0137] 1. Performance Test 1: Deformation Test of Protective Plate For the battery pack assembly in the embodiments and comparative examples, multiple batteries are stacked and arranged in the receiving cavity formed by the frame and the support plate, and are bonded and fixed to the support plate by an adhesive layer. Then, a protective plate is set on the side of the support plate away from the batteries. The values ​​of a, b and s in the battery pack in each embodiment and comparative example are shown in the table below. Apart from this, the rest of the structure is the same.

[0138] According to GB38031-2025, the bottom impact test of the battery pack is carried out. After the vibration test, the maximum deformation of the protective plate in the height direction of the battery pack is measured. If the maximum deformation is less than or equal to 6mm, it is considered good. If the maximum deformation is greater than 6mm and less than or equal to 10mm, it is considered qualified. If the maximum deformation is greater than 10mm, it is considered unqualified.

[0139] 2. Performance Test 2: Bonding Strength Test between Battery Pack and Support Plate For the battery packs assembled in the embodiments and comparative examples, 200 batteries are stacked and arranged in the cavity formed by the frame and the support plate, and are fixed to the support plate by adhesive layer. Then, a protective plate is set on the side of the support plate away from the batteries. The values ​​of a, b and s in the battery packs of each embodiment and comparative example are shown in the table below. Apart from this, the rest of the structure is the same.

[0140] 1) Record the number of batteries in the battery pack as N1; 2) Perform vibration tests on the battery pack in accordance with GB38031-2025. Observe whether the batteries attached to the support plate detach from the support plate after the vibration test, and record the number of batteries that detach from the support plate as N2. 3) Calculate the degree of adhesion separation between the battery and the support plate as N=N2 / N1. If N is less than or equal to 1%, it is good; if N is greater than 1% and less than or equal to 3%, it is qualified; if N is greater than 3%, it is unqualified.

[0141] The table below lists test data for several embodiments and comparative examples: Referring to the data listed in the table above, it can be seen that in the experimental schemes for testing the bonding strength between the battery pack and the support plate related to Examples 1 to 18, the formula... The values ​​ranged from 0.12 to 39. The battery packs according to these embodiments demonstrated satisfactory performance in both Performance Test 1 and Performance Test 2. This verifies that the formula... When the value falls within the range of 0.12 to 39, not only is the risk of failure of the battery pack and the support plate bonding lower, but the protective plate also has a better protective effect.

[0142] In contrast, in Comparative Examples 1 and 3, the formula The value is less than 0.12. According to these embodiments, the battery pack, although showing satisfactory performance in Test 2, showed unsatisfactory performance in Test 1. This verifies the validity of the formula. When the value is less than 0.12, the protective effect of the protective plate is poor.

[0143] Meanwhile, in Comparative Examples 2 and 4, the formula The value is greater than 39. According to these embodiments, the battery pack, although showing satisfactory performance in Test 1, showed unsatisfactory performance in Test 2. This verifies the validity of the formula. When the value is greater than 39, the risk of adhesion failure between the battery pack and the support plate is relatively high.

[0144] Furthermore, referring to the table above, in Examples 5 to 10, 13, 14, 17 and 18, the formula... The value of falls within the preferred range of 0.33 to 11.5. The batteries according to these embodiments demonstrated good performance in both performance test 1 and performance test 2. This verifies that, in the formula... When the value falls within the preferred range of 0.33 to 11.5, the risk of adhesion failure between the battery pack and the support plate is further reduced, and the protective effect of the protective plate is further improved.

[0145] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0146] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0147] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0148] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, The system includes a battery pack, a support plate, a protective plate, and a first adhesive. The battery pack is supported on the support plate, and the protective plate is located on the side of the support plate opposite to the battery pack. The battery pack includes multiple batteries, each with a bottom surface facing the support plate. The first adhesive is disposed between the bottom surface of the battery and the support plate for bonding to both. The thickness of the protective plate is a mm, the thickness of the first adhesive is b mm, and the area of ​​the support plate is s1 m². 2 The sum of the areas of the bottom surfaces of the plurality of batteries is s² m. 2 ,ratio Equals s, 0.12≤ ≤39.

2. The battery pack according to claim 1, characterized in that, It also includes a second adhesive, which is disposed between adjacent batteries and adhered to the adjacent batteries.

3. The battery pack according to claim 2, characterized in that, In a direction perpendicular to the support plate, the distance between the top of the second adhesive body and the bottom surface of the battery is d1 mm, where 4≤d1≤28.

4. The battery pack according to claim 2, characterized in that, It also includes a side beam that surrounds the battery pack and is fixedly connected to the support plate and / or the protective plate.

5. The battery pack according to claim 4, characterized in that, The second adhesive is also disposed between the side beam and the battery adjacent to the side beam and is indirectly bonded to both.

6. The battery pack according to claim 5, characterized in that, In the direction perpendicular to the support plate, the dimension of the side beam is h1 mm, the dimension of the second adhesive body is h2 mm, and 0.017≤h2 / h1≤0.

65.

7. The battery pack according to claim 4, characterized in that, It also includes a third adhesive. The support plate includes a plate body and a peripheral portion surrounding the plate body. The plate body supports the battery pack. The side beam includes a side beam connecting portion. The side beam connecting portion is located on the side of the peripheral portion facing away from the protective plate. The third adhesive is disposed between the side beam connecting portion and the peripheral portion to bond the side beam connecting portion to the support plate.

8. The battery pack according to claim 7, characterized in that, The side beam also includes a side beam body, and the side beam connecting portion protrudes from the inside of the side beam body toward the battery pack.

9. The battery pack according to claim 8, characterized in that, The side beam body has an inner side facing the battery pack, and the dimension of the side beam connection is w mm in a direction perpendicular to the inner side, where 8 ≤ w ≤ 35.

10. The battery pack according to any one of claims 1 to 9, characterized in that, The battery includes a first battery side and a second battery side. The first battery side, the second battery side, and the bottom surface of the battery are perpendicular to each other and connected to each other. The area of ​​the bottom surface of the battery is s3, the area of ​​the first battery side is s4, and the area of ​​the second battery side is s5. The units of s3, s4, and s5 are all meters (m). 2 , s3 > s4 and / or s3 > s5.

11. The battery pack according to any one of claims 1 to 9, characterized in that, The bottom surface of the battery has an uncovered area not covered by the first adhesive, where 0.4≤b≤5.

12. The battery pack according to claim 11, characterized in that, The uncovered area is equipped with a pressure relief valve, where 0.8 ≤ a ≤ 5.

13. The battery pack according to any one of claims 1 to 9, characterized in that, The protective panel includes a body layer and a buffer layer stacked on at least one side thereof, the body layer being at least partially made of steel and the buffer layer being at least partially made of polyvinyl chloride.

14. The battery pack according to claim 13, characterized in that, The thickness of the protective plate is t1 mm, the thickness of the buffer layer is t2 mm, and 0.09≤t2 / t1≤0.

4.

15. The battery pack according to claim 13, characterized in that, The thickness of the body layer is t3 mm, where 0.2 ≤ t3 ≤ 3.

16. The battery pack according to claim 13, characterized in that, The buffer layer is located on the side of the main body layer opposite to the battery pack.

17. The battery pack according to any one of claims 1 to 9, characterized in that, The protective plate includes a body layer, which is at least partially made of steel, wherein the carbon content of the steel in the body layer is N, where N≥0.04 and 0.5≤a≤4.

6.

18. The battery pack according to any one of claims 1 to 9, characterized in that, The protective panel includes a body layer and a reinforcing layer stacked on at least one side thereof, the body layer being at least partially made of steel and the reinforcing layer being at least partially made of polyurea.

19. The battery pack according to claim 18, characterized in that, The thickness of the reinforcing layer is t4 mm, where 0.5 ≤ t4 ≤ 3.6 mm.

20. The battery pack according to claim 18, characterized in that, The protective plate includes two reinforcing layers, which are respectively disposed on opposite sides of the body layer.

21. The battery pack according to any one of claims 1 to 9, characterized in that, In the direction perpendicular to the support plate, the distance between the support plate and the protective plate is d2 mm, where 1≤d2≤15.

22. The battery pack according to any one of claims 1 to 9, characterized in that, It also includes an elastic buffer, which is disposed between the support plate and the protective plate. In the direction perpendicular to the support plate, the size of the elastic buffer is h3 mm, and 1≤h3≤15.

23. The battery pack according to any one of claims 1 to 9, characterized in that, The hardness of the protective plate is greater than that of the support plate, and / or the thickness of the protective plate is greater than that of the support plate.

24. The battery pack according to any one of claims 1 to 9, characterized in that: 0.5≤a≤5; and / or 0.2≤b≤5; and / or 0.6 ≤ s ≤ 0.9; and / or 0.6≤s1≤5.5； 0.4≤s2≤4.5。 25. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 24.

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