Battery pack and powered device

Abstract

Provided are a battery pack and an electric device. The battery pack comprises a plurality of batteries, a box body, and a partition. The plurality of batteries are arranged along a thickness direction. The box body has an inner space for accommodating the plurality of batteries. The partition is arranged between two adjacent batteries along the thickness direction, and comprises a pad-shaped portion and a plurality of strip-shaped portions. The plurality of strip-shaped portions are arranged at the outer periphery of the pad-shaped portion, each extending along a corresponding edge of the pad-shaped portion, the pad-shaped portion and the plurality of strip-shaped portions are integrally formed, the plurality of strip-shaped portions are located between the pad-shaped portion and one of the two batteries, and separate the pad-shaped portion from the battery. 10%≤A%≤50%, 0.02W / (m·K)≤B≤0.2W / (m· K), A% is the compression rate of the partition under a pressure of 1Mpa along the thickness direction, and B is the thermal conductivity of the partition, in units of W / (m·K). Accordingly, the partition has good heat insulation performance, can effectively delay or block the transfer of heat, and can also provide expansion space for the battery.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and more specifically to a battery pack and an electrical device having the battery pack. Background Technology

[0002] Batteries are widely used in various electronic devices, electric vehicles, and energy storage systems due to their excellent performance. However, their safety, especially the risk of thermal runaway, remains a concern. Thermal runaway occurs when an abnormal condition such as an internal short circuit or overcharging causes an uncontrollable exothermic reaction within the battery, leading to a rapid increase in temperature and pressure. This can cause the battery to swell, catch fire, or explode. In a battery pack, if a single cell experiences thermal runaway, it will release a large amount of heat to surrounding cells through heat conduction. Adjacent cells absorb this heat, causing their temperatures to rise rapidly and potentially triggering thermal runaway in succession, ultimately leading to the thermal failure of the entire battery pack and reducing its safety and reliability. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem of rapid heat transfer between batteries in conventional battery packs, which can lead to a chain reaction of thermal runaway.

[0004] The battery pack includes multiple batteries, a housing, and separators. The batteries are arranged along the thickness direction. The housing has an internal space to accommodate the batteries. Separators are located between two adjacent batteries in the thickness direction and include a pad-shaped portion and multiple strip-shaped portions. The multiple strip-shaped portions are located on the outer periphery of the pad-shaped portion, each strip extending along a corresponding edge of the pad-shaped portion. The pad-shaped portion and the multiple strip-shaped portions are integrally formed. The multiple strip-shaped portions are located between the pad-shaped portion and one of the two batteries, spacing the pad-shaped portion from the battery. 10%≤A%≤50%, 0.02W / (m·K)≤B≤0.2W / (m·K), where A% is the compressibility of the separator under a pressure of 1 MPa in the thickness direction, and B is the thermal conductivity of the separator in W / (m·K).

[0005] In this disclosure, by providing a spacer with low thermal conductivity between two adjacent batteries, the spacer can effectively delay or block the transfer of heat to surrounding components when a single battery experiences thermal runaway. Secondly, the spacer also has a low compressibility, making it less susceptible to compression and deformation during battery cyclic expansion and compression. This results in minimal thickness variation of the spacer throughout the battery's lifespan, effectively ensuring stable thermal insulation performance and improving the safety and reliability of the battery pack. Furthermore, multiple strip-shaped portions separate the pad-shaped portion from the battery, creating a space between them that provides expansion space for the battery. In addition, the pad-shaped portion and multiple strip-shaped portions are integrally formed, reducing the number of components, simplifying the manufacturing process, lowering production costs, and improving production efficiency.

[0006] This disclosure 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 this disclosure 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 a schematic cross-sectional view of a battery pack according to an embodiment of the present disclosure.

[0011] Figure 2 for Figure 1 A schematic diagram of the battery pack and its separators.

[0012] Figure 3 This is a schematic diagram of the structure of a battery and a separator according to another embodiment of the present disclosure.

[0013] Figure 4 This is a schematic diagram of the structure of a battery and a separator according to another embodiment of the present disclosure.

[0014] Figure 5 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0015] Figure Labels Battery pack - 100; Battery - 10; Box body - 20; Internal space - 21; Divider - 30; Pad-like part - 31; Strip-like part - 32; Bottom strip-like part - 33; Top strip-like part - 34; Side strip-like part - 35; Electrical equipment - 200. Detailed Implementation

[0016] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0017] <Example Battery Pack> refer to Figure 1According to one embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple batteries 10 connected in series and parallel, and integrates a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. The battery pack 100 may also include a housing 20, in which the aforementioned components are housed and sealed by a top cover, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a rechargeable battery and a power source for new energy vehicles, primarily used for storing and providing electrical energy.

[0018] The enclosure 20 has an internal space 21, in which multiple batteries 10 are stored. The enclosure 20 effectively prevents external impacts, compression, and vibrations from affecting the batteries 10, battery management system, electrical wiring, and other components inside the enclosure 20. In addition, the enclosure 20 also prevents external moisture or dust and other contaminants from entering the interior of the enclosure 20.

[0019] A battery pack can be formed by connecting multiple batteries 10 with similar capacity and internal resistance. For example, multiple batteries 10 can be connected in series to form a battery pack, or multiple batteries 10 can be connected in parallel to form a battery pack, or a portion of multiple batteries 10 can be connected in series and another portion can be connected in parallel to form a battery pack.

[0020] The battery pack 100 may also include conductive elements. The conductive elements can electrically connect the terminals of at least two batteries 10, i.e., the output terminals of the battery current, to enable multiple batteries 10 to be connected in series or in parallel.

[0021] Battery 10 is the basic energy storage unit in the battery pack, used to store and release electrical energy, and capable of converting chemical energy into electrical energy (discharging process) or storing electrical energy as chemical energy (charging process) through internal chemical reactions. During charging and discharging, battery 10 undergoes a certain volume expansion and contraction. In battery pack 100, multiple batteries 10 are arranged along the thickness direction. Multiple batteries 10 can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, battery 10 is a prismatic battery. In other embodiments, battery 10 is a cylindrical battery. In other embodiments, battery 10 is a pouch battery. In other embodiments, battery 10 may also be other types of batteries. This disclosure does not limit its type. For ease of description, X is used to indicate the thickness direction in the accompanying drawings of this disclosure.

[0022] Under abnormal conditions, battery pack 100 may experience thermal runaway, which is a phenomenon where an exothermic reaction occurs inside the battery due to short circuits, overcharging, or high temperatures, causing the temperature to rise rapidly and become uncontrollable. Thermal runaway not only damages the battery but can also lead to safety accidents. When one battery experiences thermal runaway, it quickly spreads to adjacent batteries, causing the entire battery pack to experience thermal runaway.

[0023] The battery pack 100 may further include a separator 30 disposed between two adjacent batteries in the thickness direction. The compressibility A of the separator 30 under a pressure of 1 MPa in the thickness direction satisfies: 10% ≤ A% ≤ 50%. Preferably, 15% ≤ A% ≤ 45%. More preferably, 21% ≤ A% ≤ 36%. Alternatively, the compressibility A% of the separator 30 under a pressure of 1 MPa in the thickness direction may also be 18%, 26%, 33%, 39%, 43%, or 47%. The thermal conductivity B of the separator 30 satisfies: 0.02 W / (m·K) ≤ B ≤ 0.2 W / (m·K). Preferably, 0.08 W / (m·K) ≤ B ≤ 0.15 W / (m·K). More preferably, 0.1 W / (m·K) ≤ B ≤ 0.12 W / (m·K). Alternatively, the thermal conductivity B of the separator 30 can also be 0.05 W / (m·K), 0.13 W / (m·K), or 0.18 W / (m·K). In some embodiments, the separator 30 is a nanoplate. A nanoplate (also known as a nanocomposite plate or nanoinsulating plate) is a thermal insulation material that uses nanoporous materials (such as nanoscale aerogels) as the main functional material and is composited with reinforcing materials through a special process. By way of example only, a nanoplate can be one or more of glass fiber, silica aerogel or fumed silica, titanium dioxide, or silicon carbide. For example, a nanoplate can be prepared by uniformly mixing aerogel, glass fiber, and a light-blocking agent and then pressing them together. It should be noted that the nanoplates and the technologies used in the nanoplates mentioned in this disclosure are well known to those skilled in the art.

[0024] If the compressibility A% of the separator 30 under a pressure of 1 MPa in the first direction is too high, the separator 30 is prone to deformation under pressure. After the battery 10 cyclically expands and compresses the separator 30, the separator 30 is easily permanently compressed, reducing its thickness and making it impossible to return to its initial thickness. This results in a decrease in thermal insulation performance, which means that it cannot effectively block heat transfer during thermal runaway of the battery 10, leading to thermal runaway of the entire battery pack 100. If the compressibility A% of the separator 30 under a pressure of 1 MPa in the first direction is too low, the separator 30 is too rigid and difficult to compress, failing to provide expansion space for the battery 10. When the battery 10 expands, it will compress the rigid separator, generating mechanical stress, which can cause damage to the battery casing or internal components, thus affecting the battery 10's lifespan and safety performance. Within a reasonable range of 10% ≤ A% ≤ 50%, the thickness of the separator 30 can be ensured to have minimal variation throughout the battery's lifespan, and the thermal insulation performance is less affected by the cyclic expansion and compression of the battery, thus allowing the separator 30 to effectively block heat transfer throughout the battery's lifespan.

[0025] If the thermal conductivity B of the separator 30 is too high, it indicates that the separator 30 has good thermal conductivity, meaning that the thermal insulation performance of the separator 30 is poor. When a battery experiences thermal runaway, heat will be rapidly transferred to adjacent batteries through the separator, leading to thermal runaway of the entire battery pack 100. If the thermal conductivity B of the separator 30 is too low, it will reduce the mechanical strength of the separator 30 and increase the difficulty of the manufacturing process. Within the range of 0.02 W / (m·K) ≤ B ≤ 0.2 W / (m·K), the separator 30 has good thermal insulation performance and also good mechanical strength.

[0026] Combination Figure 2 The separator 30 may include a pad-shaped portion 31 and a plurality of strip-shaped portions 32. The plurality of strip-shaped portions 32 are disposed on the outer periphery of the pad-shaped portion 31. Each strip-shaped portion 32 extends along a corresponding edge of the pad-shaped portion 31. The pad-shaped portion 31 and the plurality of strip-shaped portions 32 are integrally formed, for example, but not limited to, injection molding or compression molding. The plurality of strip-shaped portions 32 are located between the pad-shaped portion 31 and one of the two batteries, and space the pad-shaped portion 31 from the battery 10.

[0027] According to the above structure, by providing a separator 30 with a low thermal conductivity between two adjacent batteries, the separator 30 can effectively delay or block the transfer of heat to surrounding components when a single battery 10 experiences thermal runaway. Secondly, the separator 30 also has a low compressibility, making it less prone to compression and deformation during the cyclic expansion and compression of the battery 10. This results in minimal thickness variation of the separator 30 throughout the battery's lifespan, effectively ensuring stable thermal insulation performance and improving the safety and reliability of the battery pack. Furthermore, multiple strip-shaped portions 32 space the pad-shaped portion 31 from the battery 10, creating a gap between the pad-shaped portion 31 and the battery 10, which provides expansion space for the battery 10. In addition, the pad-shaped portion 31 and the multiple strip-shaped portions 32 are integrally formed, reducing the number of components, simplifying the manufacturing process, lowering production costs, and improving production efficiency.

[0028] refer to Figure 3 The plurality of strip-shaped portions 32 may include only the bottom strip-shaped portion 33. The bottom strip-shaped portion 33 is located at the bottom outer periphery of the battery 10 in the height direction and extends along the width direction of the battery. For ease of description, in the accompanying drawings of this disclosure, Y is used to indicate the width direction and Z is used to indicate the height direction.

[0029] During the assembly of the battery pack 100, adhesive is typically applied to the bottom of the housing 20 to bond and secure the battery 10. Operators must first apply adhesive to the bottom plate of the housing 20, then accurately place the battery 10 and other components onto the adhesive layer, applying pressure to ensure full contact between the battery 10 and the housing 20. If adhesive overflows between the battery 10 and the padding portion 31 during the bonding process, a rigid structure will form within the space between the battery 10 and the padding portion 31 after the adhesive cures, preventing the battery 10 from expanding. When the battery 10 expands during charging and discharging, it will directly contact this rigid structure, generating mechanical stress. This causes localized stress concentration on the battery surface, leading to deformation of the battery casing or damage to the internal structure, thus affecting the battery pack's lifespan and safety. Therefore, the bottom strip portion 33 effectively prevents adhesive overflow into the space 40 between the battery 10 and the padding portion 31, avoiding any impact on battery performance after adhesive curing.

[0030] refer to Figure 3 The bottom strip 33 is arranged at intervals from the bottom end of the battery 10 in the height direction.

[0031] Based on the above structure, sufficient space can be reserved at the bottom of the battery 10 to increase the bonding surface between the battery and the adhesive, thereby increasing the bonding area of ​​the battery and making the battery bonded to the casing more firmly.

[0032] Continue to refer to Figure 3 In the height direction, the height of battery 10 is H1, in mm, and the distance between the bottom strip 33 and the bottom end of the battery is H2, in mm, where 0.0017 ≤ H2 / H1 ≤ 0.25. Preferably, 0.007 ≤ H2 / H1 ≤ 0.19. More preferably, 0.01 ≤ H2 / H1 ≤ 0.07. Alternatively, the ratio H2 / H1 can also be 0.004, 0.04, 0.06, 0.09, or 0.21. For example, the height H1 of the battery satisfies: 80mm ≤ H1 ≤ 300mm. The distance H2 between the bottom strip 33 and the bottom end of the battery satisfies: 0.5mm ≤ H2 ≤ 20mm. This disclosure does not impose specific limitations on this.

[0033] If the distance H2 between the bottom strip 33 and the bottom of the battery is too small (i.e., the bottom strip 33 is closer to the bottom of the battery), the contact area between the adhesive and the battery will be small, resulting in a weak bond between the battery and the bottom of the casing when the battery is assembled into the casing. If the distance H2 between the bottom strip 33 and the bottom of the battery is too large, the contact area between the adhesive and the battery surface will be large when the battery is assembled into the casing. This will lead to stress concentration in the area formed after the adhesive cures during battery cycle expansion, reducing battery performance. Within the reasonable range of 0.0017mm ≤ H2 / H1 ≤ 0.25mm, the battery can be firmly bonded to the bottom of the casing while ensuring that battery performance is not affected.

[0034] In another embodiment, the plurality of strips 32 may include only a top strip 34 and a bottom strip 33. The top strip 34 is located at the top outer periphery of the battery 10 in the height direction and extends along the width direction of the battery 10.

[0035] The gap between the top strip 34 and the bottom strip 33 provides the necessary expansion space for the battery 10. Furthermore, the top strip 34 and the bottom strip 33 work together to provide support for both the bottom and top of the battery 10, effectively dispersing the mechanical stress and thermal shock generated by thermal runaway. This also enhances the structural stability of the entire battery pack 100.

[0036] In another embodiment, the plurality of strips 32 may include only two side strips 35 and a bottom strip 33, with both side strips 35 extending along the height direction and spaced apart in the width direction of the battery. The two side strips 35 are located on the top side of the bottom strip 33 in the height direction.

[0037] The gap between the bottom strip 33 and the two side strips 35 provides the necessary expansion space for the battery 10. Furthermore, the two side strips 35 cooperate to provide support to both sides of the battery in the width direction, effectively dispersing the mechanical stress and thermal shock generated by thermal runaway. This also enhances the structural stability of the entire battery pack.

[0038] In another embodiment, the plurality of strips 32 may include a top strip 34, two side strips 35, and a bottom strip 33. The top strip 34 is located on the top side of the two side strips 35 in the height direction and extends along the width direction of the battery.

[0039] According to the above structure, the top strip-shaped portion 34, the two side strip-shaped portions 35, and the bottom strip-shaped portion 33 can provide a stable support structure around the battery. When the battery expands, the expansion force can be effectively and evenly distributed, avoiding stress concentration and improving the overall safety performance of the battery pack.

[0040] Continue to refer to Figure 3 The top strip 34, one side strip 35, the bottom strip 33, and the other side strip 35 are connected end to end in sequence.

[0041] According to the above structure, the closed frame structure formed by the top strip 34, one side strip 35, the bottom strip 33, and the other side strip 35 can provide a stable support structure for the battery 10. When the battery expands, the expansion force can be effectively and evenly distributed, avoiding stress concentration. In addition, this closed frame structure can also prevent impurities such as dust, metal debris, or electrolyte leakage from entering the space 40 between the battery 10 and the pad-shaped portion 31, improving the safety and reliability of the battery pack.

[0042] In another embodiment, the plurality of strips 32 may include only two side strips 35, both of which extend along the height direction of the battery and are spaced apart in the width direction of the battery 10. The width of each side strip 35 is W1 in mm. The width of the battery is W2 in mm, where 0.005 ≤ W1 / W2 ≤ 0.338. Preferably, 0.01 ≤ W1 / W2 ≤ 0.238. More preferably, 0.04 ≤ W1 / W2 ≤ 0.138. Alternatively, the ratio W1 / W2 may also be 0.026, 0.031, 0.037, 0.052, 0.067, 0.084, 0.156, or 0.278. For example, the width W1 of each side strip 35 satisfies: 3 mm ≤ W1 ≤ 50 mm. The width W2 of the battery satisfies: 148 mm ≤ W2 ≤ 600 mm. This disclosure does not impose any specific limitations on this matter.

[0043] If the ratio W1 / W2 is too small, meaning the width W1 of each side strip 35 is relatively small, the mechanical strength of each side strip 35 will be weak. Each side strip 35 will be prone to deformation or breakage due to battery expansion, failing to provide stable support for the battery. If the ratio W1 / W2 is too large, meaning the width W1 of each side strip 35 is relatively large, this will lead to material waste and increased production costs. It will also result in insufficient expansion space for the battery. Within a reasonable range of 0.005 ≤ W1 / W2 ≤ 0.338, each side strip 35 can better support the battery, provide sufficient expansion space, reduce material waste, and lower production costs.

[0044] In another embodiment, the plurality of strip-shaped portions 32 may include only a top strip-shaped portion 34 or a bottom strip-shaped portion 33 extending along the width direction of the battery. The width of the top strip-shaped portion 34 and / or the bottom strip-shaped portion 33 is D1 in mm, and the height of the battery 10 is H1 in mm, with 0.01 ≤ D1 / H1 ≤ 0.375. Preferably, 0.04 ≤ D1 / H1 ≤ 0.298. More preferably, 0.09 ≤ D1 / H1 ≤ 0.167. Alternatively, the ratio D1 / H1 may also be 0.02, 0.06, 0.24, or 0.335. For example, the width D1 of the top strip-shaped portion 34 and / or the bottom strip-shaped portion 33 satisfies: 3 mm ≤ D1 ≤ 30 mm. The height H1 of the battery satisfies: 80 mm ≤ H1 ≤ 300 mm. This disclosure does not specifically limit this.

[0045] If the ratio D1 / H1 is too small, meaning the width D1 of the top strip 34 and / or the bottom strip 33 is too small, the mechanical strength of the top strip 34 and / or the bottom strip 33 will be weak. The top strip 34 and / or the bottom strip 33 will be prone to deformation or breakage due to battery expansion force, failing to provide stable support for the battery. If the ratio D1 / H1 is too large, meaning the width D1 of the top strip 34 and / or the bottom strip 33 is too large, this will lead to material waste, increased production costs, and insufficient expansion space for the battery. Within the reasonable range of 0.01 ≤ D1 / H1 ≤ 0.375, the top strip 34 and / or the bottom strip 33 can better support the battery, provide sufficient expansion space, reduce material waste, and lower production costs.

[0046] In another embodiment, reference Figure 1 The thickness of each strip-shaped portion 32 is D2 (mm), and the thickness of the pad-shaped portion 31 is D3 (mm), where 0.03 ≤ D2 / D3 ≤ 10. Preferably, 0.7 ≤ D2 / D3 ≤ 8. More preferably, 3 ≤ D2 / D3 ≤ 6. Alternatively, the ratio D2 / D3 can also be 0.3, 2.5, 4.7, 5.4, 7.5, or 9.4. For example, the thickness D2 of each strip-shaped portion 32 satisfies: 0.3 mm ≤ D2 ≤ 5 mm. The thickness D3 of the pad-shaped portion 31 satisfies: 0.5 mm ≤ D2 ≤ 10 mm. This disclosure does not impose specific limitations in this regard.

[0047] If the ratio D2 / D3 is too small, meaning the thickness D2 of each strip 32 is relatively small and the thickness D3 of the pad 31 is relatively large, the distance between the battery 10 and the pad 31 in the thickness direction will be too small. This results in a small space 40 between the battery 10 and the pad 31, which cannot provide sufficient expansion space for the battery. When the battery expands, this leads to excessive mechanical stress on the battery surface, reducing battery performance and affecting the performance of the battery pack. If the ratio D2 / D3 is too large, meaning the thickness D2 of each strip 32 is relatively large, within the limited internal space 21 of the housing 20, if the thickness D2 of each strip 32 is too large, each strip 32 will excessively occupy the internal space 21, reducing the space utilization rate of the internal space 21. Within the reasonable range of 0.03 ≤ D2 / D3 ≤ 10, sufficient expansion space can be provided for the battery, effectively avoiding mechanical damage or deformation caused by expansion force, while also improving the space utilization rate of the internal space 21.

[0048] refer to Figure 3 On the projection plane perpendicular to the thickness direction, the projected area of ​​the multiple strip-shaped portions 32 is S1, in mm. 2 The projected area of ​​the pad-shaped portion 31 is S2, in mm. 2 , 2%≤S1 / S2≤60%.

[0049] If the ratio S1 / S2 is too small, that is, the projected area S1 of the multiple strip-shaped portions 32 is relatively small, it cannot provide stable support for the battery. If the ratio S1 / S2 is too large, that is, the projected area S1 of the multiple strip-shaped portions 32 is relatively large, it cannot provide sufficient expansion space for the battery.

[0050] In another embodiment, reference Figure 4 The pad-shaped portion 31 has multiple strip-shaped portions 32 on either side in the thickness direction.

[0051] According to the above structure, expansion space can be further provided for the battery, and the expansion force of the batteries on both sides of the pad-shaped portion 31 can be absorbed simultaneously. In addition, the above structure can further delay heat spread and improve the heat insulation effect.

[0052] Continue to refer to Figure 4 The plurality of strip-shaped portions 32 located on one side of the pad-shaped portion 31 in the thickness direction are arranged symmetrically with the plurality of strip-shaped portions 32 located on the other side of it along a symmetrical plane perpendicular to the thickness direction.

[0053] Based on the above structure, it can be ensured that the battery 10 is subjected to uniform stress when it expands, effectively avoiding stress concentration, structural deformation or battery tilting caused by unilateral force, and improving the mechanical stability and overall structural reliability of the battery pack 100.

[0054] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0055] 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.

[0056] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0057] In a non-restrictive example, refer to Figure 5 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to power the electric vehicle.

[0058] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0059] 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.

[0060] It should be understood that the use of terms such as thickness direction, height direction, and width direction in this disclosure to distinguish different directions is primarily to differentiate the relative positional relationships of different sides of the battery. Although the orientation of the battery is described with reference to a specific orientation in this disclosure, this is not a limiting requirement. Any technical solution obtained by adaptively adjusting the battery orientation based on the inventive concept of this disclosure should fall within the protection scope of this disclosure.

[0061] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0062] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: Multiple batteries are arranged along the thickness direction; The housing has an internal space for accommodating the plurality of batteries; as well as A separator, disposed between two adjacent batteries in the thickness direction, includes a pad-shaped portion and a plurality of strip-shaped portions. The plurality of strip-shaped portions are located on the outer periphery of the pad-shaped portion, each strip extending along a corresponding edge of the pad-shaped portion. The pad-shaped portion and the plurality of strip-shaped portions are integrally formed. The plurality of strip-shaped portions are located between the pad-shaped portion and one of the two batteries, spacing the pad-shaped portion from the battery. 10%≤A%≤50%, 0.02W / (m·K)≤B≤0.2W / (m·K), where A% is the compressibility of the separator when subjected to a pressure of 1 MPa in the thickness direction, and B is the thermal conductivity of the separator, in W / (m·K).

2. The battery pack according to claim 1, characterized in that, The plurality of strip-shaped portions include a bottom strip-shaped portion located at the bottom outer periphery of the battery in the height direction, and the bottom strip-shaped portion extending along the width direction of the battery.

3. The battery pack according to claim 2, characterized in that, The bottom strip-shaped portion is arranged at a distance from the bottom end of the battery in the height direction.

4. The battery pack according to claim 3, characterized in that, In the height direction, the height of the battery is H1 in mm, and the distance between the bottom strip and the bottom of the battery is H2 in mm, where 0.0017 ≤ H2 / H1 ≤ 0.

25.

5. The battery pack according to claim 4, characterized in that, 80mm≤H1≤300mm, and / or, 0.5mm≤H2≤20mm.

6. The battery pack according to claim 2, characterized in that, The plurality of strip-shaped portions also include a top strip-shaped portion, which is located at the top outer periphery of the battery in the height direction and extends along the width direction of the battery.

7. The battery pack according to claim 2, characterized in that, The plurality of strip-shaped portions also include two side strip-shaped portions, both of which extend along the height direction and are spaced apart in the width direction of the battery.

8. The battery pack according to claim 7, characterized in that, The plurality of strip-shaped portions also include a top strip-shaped portion, which is located on the top side of the two side strip-shaped portions in the height direction, and the top strip-shaped portion extends along the width direction of the battery.

9. The battery pack according to claim 8, characterized in that, The top strip, one side strip, the bottom strip, and the other side strip are connected end to end in sequence.

10. The battery pack according to claim 1, characterized in that, The plurality of strip-shaped portions include two side strip-shaped portions, both of which extend along the height direction of the battery and are spaced apart in the width direction of the battery. The width of each side strip-shaped portion is W1 in mm, and the width of the battery is W2 in mm, where 0.005 ≤ W1 / W2 ≤ 0.

338.

11. The battery pack according to claim 10, characterized in that, 3mm≤W1≤50mm, and / or, 148mm≤W2≤600mm.

12. The battery pack according to claim 1, characterized in that, The plurality of strip-shaped portions include a top strip-shaped portion or a bottom strip-shaped portion extending along the width direction of the battery, wherein the width of the top strip-shaped portion and / or the bottom strip-shaped portion is D1 in mm, and the height of the battery is H1 in mm, and 0.01≤D1 / H1≤0.

375.

13. The battery pack according to claim 12, characterized in that, 3mm≤D1≤30mm, and / or, 80mm≤H1≤300mm.

14. The battery pack according to claim 1, characterized in that, The thickness of each strip is D2 in mm, and the thickness of the pad is D3 in mm, where 0.03 ≤ D2 / D3 ≤ 10.

15. The battery pack according to claim 14, characterized in that, 0.3mm≤D2≤5mm, and / or, 0.5mm≤D3≤10mm.

16. The battery pack according to claim 1, characterized in that, On a projection plane perpendicular to the thickness direction, the projected area of ​​the plurality of strip-shaped portions is S1, in mm. 2 The projected area of ​​the pad-shaped portion is S2, in mm. 2 , 2%≤S1 / S2≤60%.

17. The battery pack according to claim 1, characterized in that, The pad-shaped portion has the plurality of strip-shaped portions on any one side of the thickness direction.

18. The battery pack according to claim 17, characterized in that, The plurality of strip-shaped portions located on one side of the pad-shaped portion in the thickness direction are arranged symmetrically with the plurality of strip-shaped portions located on the other side of the pad-shaped portion along a symmetrical plane perpendicular to the thickness direction.

19. The battery pack according to any one of claims 1 to 18, characterized in that, The separator is a nanoplate.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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