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 spacer. The plurality of batteries are stacked along a first direction, and two major surfaces of any two adjacent batteries face each other. The box body is provided with a battery compartment for accommodating the plurality of batteries. The spacer is arranged between the two batteries and in contact with the two major surfaces, wherein the compression rate α of the spacer satisfies 0.5%≤α≤30% when a pressure of 0.2 MPa is applied. When a pressure of 0.6 MPa is applied, the compression rate α of the spacer satisfies 55%≤α≤85%. The spacer absorbs stress through its own deformation, avoids excessive internal mechanical stress caused by insufficient expansion space, provides a buffer space for the expansion of the battery, and prolongs the service life of the battery pack.

Description

Technical Field

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

[0002] Battery packs are known to consist of multiple cells, typically stacked in the same direction, with spacers placed on the large surfaces of adjacent cells to achieve thermal isolation and insulation buffering. During battery cycling, the cell volume continuously expands, leading to varying demands for expansion space between adjacent cells at different stages. If the initial expansion space is too large, while it can accommodate long-term expansion, insufficient interfacial constraint on the large surfaces of the cells in the early stages of cycling fails to suppress electrolyte decomposition and gas generation. Conversely, if the initial expansion space is too small, although high interfacial pressure can effectively suppress gas generation and achieve good initial performance in the early stages, irreversible expansion of the cells as cycling progresses will rapidly deplete the limited buffer space, causing the cells to experience significant mechanical stress and structural distortion in the later stages. Traditionally, the spacers between adjacent cells in battery packs cannot simultaneously meet the expansion space requirements in the early and later stages of cycling, thus affecting the cycle life of the battery pack. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to solve the problem that the spacers in the battery pack cannot simultaneously meet the expansion space requirements in the early and middle stages of battery cycling.

[0004] The battery pack includes multiple batteries, a housing, and spacers. The batteries are stacked along a first direction, with the two large faces of any two adjacent batteries facing each other. The housing has a battery compartment for accommodating the multiple batteries. Spacers are positioned between two batteries and contact their two large faces. Under a pressure of 0.2 MPa, the compressibility α of the spacers satisfies: 0.5% ≤ α ≤ 30%. Under a pressure of 0.6 MPa, the compressibility α of the spacers satisfies: 55% ≤ α ≤ 85%.

[0005] The spacer's two sides are in contact with the two large surfaces of the two adjacent batteries, acting as a buffer during battery expansion. In the early stages of battery cycling, the negative electrode potential decreases, and the electrolyte undergoes reduction and decomposition on the negative electrode surface, producing gas and solid deposits insoluble in the electrolyte, forming a thin film, the SEI film. At this time, the spacer exhibits a low compressibility (0.5% ≤ α ≤ 30%) under 0.2 MPa pressure, exhibiting relatively stiff characteristics. This allows it to apply a higher initial interface pressure to the two adjacent batteries, reducing gas production in the early stages of cycling. In the middle and later stages of battery cycling, the positive and negative electrode materials expand in volume due to repeated lithium ion insertion and extraction, leading to SEI film rupture, repair, and thickness increase, generating significant expansion stress. At this point, the spacer exhibits a high compressibility (55% ≤ α ≤ 85%) under 0.6 MPa pressure, becoming relatively soft. Through its own deformation, the spacer absorbs stress, preventing excessive internal mechanical stress due to insufficient expansion space, providing buffer space for battery expansion, and thus extending the battery pack's lifespan.

[0006] This disclosure also provides an electrical appliance. The electrical appliance 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 diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0011] Figure 2 for Figure 1 A schematic diagram showing the disassembled battery and separator.

[0012] Figure 3 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0013] Figure 4 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0014] Figure 5 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0015] Figure 6 for Figure 1An exploded view of the battery and the separator of another embodiment.

[0016] Figure 7 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0017] Figure 8 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0018] Figure 9 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0019] Figure 10 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0020] Figure 11 for Figure 1 An exploded view of the battery and the separator of another embodiment.

[0021] Figure 12 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100—Battery pack; 10—Battery; 11—Main surface; 12—Terminal post; 20—Box body; 30—Spacer; 31, 31a, 31b, 31c, 31d, 31e, 31f—First spacer; 32, 32a, 32b, 32c, 32d—Second spacer; 40—Box top cover; 50—Battery management system; 200—Electrical equipment. Detailed Implementation

[0024] 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.

[0025] <Example Battery Pack>

[0026] This disclosure provides a battery pack 100 according to one embodiment. (See reference...) Figure 1 and Figure 2The battery pack 100 includes multiple batteries 10, a housing 20, spacers 30, a housing top cover 40, and a battery management system 50. The multiple batteries 10 are electrically connected to each other. The housing 20 is used to house the batteries 10 and the battery management system 50. The batteries 10 are electrically connected to the battery management system 50 to realize the charging and discharging process of the multiple batteries 10. The housing 20 and the housing top cover 40 serve as external protective structures, typically made of metal or composite materials, and have waterproof, dustproof, and impact-resistant functions, providing a safe operating environment for the internal components such as the batteries 10 and the battery management system 50.

[0027] The battery pack 100 may also include a battery group composed of multiple batteries 10 connected in series and parallel, and integrate a battery management system 50 (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. These components are housed within the receiving cavity of the housing 20 and sealed by the housing top cover 40, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a power source for new energy vehicles, primarily used for storing and providing electrical energy, as the rechargeable battery 10 is the primary power source for these vehicles.

[0028] For ease of description, in the accompanying drawings of this disclosure, arrows X+ and X- respectively indicate opposite sides in a first direction, arrows Y+ and Y- respectively indicate opposite sides in a second direction, and arrows Z+ and Z- respectively indicate opposite sides in a third direction.

[0029] Multiple batteries 10 are stacked along a first direction, with the two large faces 11 of any two adjacent batteries 10 facing each other. The housing 20 has a battery compartment for accommodating the multiple batteries 10. Spacers 30 are disposed between two batteries 10 and in contact with the two large faces 11. When subjected to a pressure of 0.2 MPa, the compression ratio α of the spacers 30 satisfies: 0.5% ≤ α ≤ 30%. When subjected to a pressure of 0.6 MPa, the compression ratio α of the spacers 30 satisfies: 55% ≤ α ≤ 85%.

[0030] The spacer 30 contacts the two large surfaces 11 of the two adjacent batteries 10 on both sides. In the early stages of battery cycling, it provides sufficient support and reverse pressure, and suppresses electrolyte decomposition and gas production. In the middle and later stages of battery cycling, its elastic deformation provides a buffer space for battery expansion. Specifically, in the early stages of battery cycling, the negative electrode potential decreases, and the electrolyte undergoes reduction decomposition on the negative electrode surface, producing gas and solid deposits insoluble in the electrolyte, thus forming a thin film, i.e., an SEI film. At this time, the spacer 30 exhibits a low compressibility at 0.2 MPa pressure (0.5% ≤ α ≤ 30%), exhibiting relatively stiff characteristics. This allows it to apply a higher initial interface pressure to the two adjacent batteries 10, reducing gas production in the early stages of cycling. The compressibility rate is the degree to which the thickness of the spacer 30 is compressed when subjected to external pressure, i.e., the interface pressure during battery expansion. In the later stages of battery cycle 10, the positive and negative electrode materials undergo volume expansion due to repeated lithium ion insertion and extraction, which leads to SEI film rupture repair and thickness increase, and generates significant expansion stress. At this time, the spacer 30 exhibits a high compressibility (55%≤α≤85%) under a pressure of 0.6MPa, which means it becomes relatively soft. Through the deformation of the spacer 30 itself, stress is absorbed, avoiding excessive internal mechanical stress due to insufficient expansion space, providing buffer space for the expansion of battery 10, and thus extending the service life of battery pack 100.

[0031] Continue to refer to Figure 2 The spacer 30 can be an integrally formed first spacer 31, which is in the shape of a pad. The integrally formed first spacer 31 is made of a single material, has a simple structure, is easy to manufacture and automate, and can reduce process complexity and cost. The first spacer 31 is in the shape of a pad and can cover the entire large surface 11 of the battery 10, providing uniform interface pressure and a buffering effect.

[0032] When subjected to a pressure of 0.2 MPa, the compressibility α of spacer 30 satisfies: 5% ≤ α ≤ 30%. When subjected to a pressure of 0.6 MPa, the compressibility α of spacer 30 satisfies: 55% ≤ α ≤ 75%. Because the single-material spacer 30 itself possesses predictable mechanical properties, it can adapt to the basic mechanical requirements of battery 10 at different cycle stages. Specifically, at a lower pressure of 0.2 MPa, the compressibility is between 5% and 30%, providing sufficient rigidity to offer stable initial support. When the pressure increases to 0.6 MPa, the compressibility rises to the range of 55% to 75%, exhibiting significant softening and buffering characteristics.

[0033] refer to Figure 3The spacer 30 can be composed of a first spacer 31a and a second spacer 32, both of which are pad-shaped and stacked along a first direction. The spacer 30 includes only the first spacer 31a and the second spacer 32, and the first spacer 31a and the second spacer 32 can be made of different materials. The synergistic effect of the material properties of the two different materials can broaden the mechanical response range of the spacer 30. The first spacer 31a and the second spacer 32 are both pad-shaped and can cover the entire large surface 11 of the battery 10, providing uniform interfacial pressure and a buffering effect.

[0034] When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer 30 satisfies: 2% ≤ α ≤ 25%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer 30 satisfies: 60% ≤ α ≤ 80%. The mechanical response range of the spacer 30 is extended by the first spacer 31a and the second spacer 32, better adapting to the mechanical requirements of the battery 10 at different cycle stages. Specifically, at a pressure of 0.2 MPa, the overall compressibility α of the spacer 30 is between 2% and 25%, allowing the spacer 30 to apply more sufficient interfacial pressure to the battery 10 to suppress gas generation. At a pressure of 0.6 MPa, the compressibility α is in the range of 60% to 80%, and the spacer 30 has a higher elastic deformation capacity, providing ample buffer space for expansion.

[0035] refer to Figure 4 The spacer 30 can be composed of a first spacer 31b and two second spacers 32a. Both the first spacer 31b and the two second spacers 32a are pad-shaped and stacked along a first direction. The two second spacers 32a are located on opposite sides of the first spacer 31b in the first direction. The spacer 30 includes only the first spacer 31b and the second spacers 32a, and the first spacer 31b and the second spacer 32a can be made of different materials. Furthermore, the spacer 30 is jointly constructed by the two second spacers 32a and the first spacer 31b, which can further broaden the mechanical response range of the spacer 30 through the synergistic effect of material properties. The first spacer 31b and the second spacer 32a are both pad-shaped and can cover the entire surface 11 of the battery 10, providing uniform interfacial pressure and a buffering effect.

[0036] When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer 30 satisfies: 0.5% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer 30 satisfies: 70% ≤ α ≤ 85%. The mechanical response range of the spacer 30 is further extended by the first spacer 31b and the two second spacers 32a to adapt to the mechanical requirements of the battery 10 at different cycle stages. Specifically, at a pressure of 0.2 MPa, the overall compressibility α of the spacer 30 is between 0.5% and 20%, and the spacer 30 further provides higher stiffness and limited deformation, applying more sufficient interfacial pressure to the battery 10 to suppress gas generation. At a pressure of 0.6 MPa, the compressibility α is in the range of 70% to 85%, and the spacer 30 further has higher elastic deformation capacity, providing ample buffer space for expansion.

[0037] refer to Figure 5 and Figure 6 The spacer 30 can be composed of multiple first spacers 31c, each of which is strip-shaped and spaced apart on a plane perpendicular to the first direction. The spacer 30 includes only multiple first spacers 31c, which can be made of a single material. The multiple first spacers 31c can be arranged in a regular pattern on the plane; in other embodiments, they can be arranged irregularly, for example, in an "I" shape. When the battery 10 undergoes restricted expansion, the spaced first spacers 31c guide the battery 10 to undergo micro-deformation along the strip-shaped gaps, effectively dispersing internal mechanical stress, avoiding stress concentration, and reducing the risk of interface damage and failure due to localized overstress. Simultaneously, reducing the amount of spacers 30 while meeting necessary mechanical support and interface pressure requirements helps achieve lightweighting and cost optimization of the battery pack 100.

[0038] Continue to refer to Figure 5 Multiple first spacers 31c can all extend along the second direction, and the multiple first spacers 31c are arranged at intervals along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Each of the batteries 10 has a terminal post 12 on one end face in the third direction. The strip-shaped multiple first spacers 31c extend along the second direction, providing uniform longitudinal support for the large surface 11 of the battery 10. When the battery 10 expands, it guides the stress to be released along the longitudinal strip gaps, and provides vertical support for the end plate area where the terminal post 12 is located.

[0039] Continue to refer to Figure 6Multiple first spacers 31c are spaced apart along a second direction, and each of the multiple first spacers 31c extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Each of the batteries 10 has a terminal post 12 on one end face in the third direction. The strip-shaped multiple first spacers 31c extending along the third direction provide uniform lateral support for the large surface 11 of the battery 10, guide stress to be released along the lateral strip gaps when the battery 10 expands, and at the same time avoid stress concentration in the area around the terminal post 12.

[0040] When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer 30 satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer 30 satisfies: 60% ≤ α ≤ 75%. The multiple first spacers 31c, spaced in a strip shape, reduce the amount of spacer 30 used while still providing sufficient interfacial pressure and mechanical support when subjected to a pressure of 0.2 MPa, and maintaining sufficient elastic deformation capacity to provide buffer space when subjected to a pressure of 0.6 MPa.

[0041] refer to Figure 7 and Figure 8 The spacer 30 can be composed of multiple first spacers 31d and one second spacer 32b. The first spacers 31d are strip-shaped, and the second spacer 32b is pad-shaped. The first spacers 31d are located on one side of the second spacer 32b in a first direction, and are spaced apart on an arrangement plane perpendicular to the first direction. The spacer 30 includes only multiple first spacers 31d and one second spacer 32b, and the first spacers 31d and the second spacer 32b can be made of different materials. Compared to a spacer 30 made of a single material, the spacer 30 composed of multiple first spacers 31d and one second spacer 32b can further broaden the mechanical response range of the spacer 30 through the synergistic effect of material properties. Simultaneously, the second spacer 32b covers the entire large surface 11 of the battery 10, providing uniform interfacial pressure and a buffering effect. The multiple first spacers 31d are arranged in strip-shaped intervals, reducing the amount of spacer 30 used while meeting the necessary mechanical support and interfacial pressure requirements.

[0042] Continue to refer to Figure 7 Multiple first spacers 31d can all extend along the second direction, and multiple first spacers 31d are arranged at intervals along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and each of the batteries 10 has an electrode post 12 on one end face of the third direction.

[0043] Continue to refer to Figure 8Multiple first spacers 31d can be arranged at intervals along the second direction, and all multiple first spacers 31d extend along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and each of the batteries 10 has an electrode post 12 on one end face of the third direction.

[0044] When subjected to a pressure of 0.2 MPa, the compressibility α of spacer 30 satisfies: 5% ≤ α ≤ 25%; when subjected to a pressure of 0.6 MPa, the compressibility α of spacer 30 satisfies: 65% ≤ α ≤ 80%. Compared to Figure 5 and Figure 6 In this embodiment, multiple first spacers 31d and one second spacer 32b jointly extend the mechanical response range of the spacer 30, making it more suitable for the mechanical needs of the battery 10 at different cycle stages. Specifically, at a pressure of 0.2 MPa, the overall compression ratio α of the spacer 30 is between 5% and 25%, and the spacer 30 can apply more sufficient interfacial pressure to the battery 10 to suppress gas generation. At a pressure of 0.6 MPa, the compression ratio α is in the range of 65% to 80%, and the spacer 30 has a higher elastic deformation capacity to provide ample buffer space for expansion.

[0045] refer to Figure 9 and Figure 10 The spacer 30 consists of multiple first spacers 31e and one second spacer 32c. The first spacers 31e are strip-shaped, and the second spacer 32c is pad-shaped. The first spacers 31e are divided into multiple pairs, each pair located on opposite sides of the second spacer 32c in a first direction and facing each other. The pairs of first spacers 31e are spaced apart on an arrangement plane perpendicular to the first direction. The spacer 30 includes only multiple first spacers 31e and one second spacer 32c, and the first spacers 31e and the second spacer 32c can be made of different materials. The different material properties of the second spacer 32c and the multiple first spacers 31e on both sides further broaden the mechanical response range of the spacer 30.

[0046] Continue to refer to Figure 9 Each first spacer 31e extends along the second direction, and multiple pairs of first spacers 31e are arranged at intervals along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Each of the batteries 10 has a pole post 12 on one end face of the third direction.

[0047] Continue to refer to Figure 10 Multiple pairs of first spacers 31e are arranged at intervals along the second direction, and each first spacer 31e extends along the third direction. The first direction, the second direction and the third direction are perpendicular to each other. Each of the batteries 10 has a pole post 12 on one end face of the third direction.

[0048] When subjected to a pressure of 0.2 MPa, the compressibility α of spacer 30 satisfies: 2% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compressibility α of spacer 30 satisfies: 75% ≤ α ≤ 85%. Compared to Figure 5 and Figure 6 In this embodiment, the mechanical response range of the spacer 30 is further extended by the first spacer 31e and multiple second spacers 32c on both sides to adapt to the mechanical requirements of the battery 10 at different cycle stages. Specifically, at a pressure of 0.2 MPa, the overall compression ratio α of the spacer 30 is between 2% and 20%. The spacer 30 further provides higher stiffness and limited deformation, applying more sufficient interfacial pressure to the battery 10 to suppress gas generation. At a pressure of 0.6 MPa, the compression ratio α is in the range of 75% to 85%, further exhibiting higher elastic deformation capability to provide ample buffer space for expansion.

[0049] refer to Figure 11 The spacer 30 can be an integrally formed first spacer 31f, which is cushion-shaped. The battery pack 100 also includes multiple second spacers 32d located between the two batteries 10. The multiple second spacers 32d are all strip-shaped and form a frame surrounding the first spacer 31f. The first spacer 31f can be a cushion-shaped structure made of a single material, arranged in the central region of the battery 10, serving as a buffer body and deforming during the expansion of the battery 10 to absorb mechanical stress. The second spacers 32d are frame structures, which can enhance the overall rigidity of the spacer 30 to provide stable peripheral support and deformation restraint.

[0050] When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer 30 satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer 30 satisfies: 65% ≤ α ≤ 85%. Specifically, at a lower pressure of 0.2 MPa, the compressibility is between 10% and 30%, and the first spacer 31f can apply sufficient initial interfacial pressure, providing stable initial support through the frame structure composed of multiple second spacers 32d. When the pressure rises to 0.6 MPa, the compressibility α is in the range of 65% to 85%, and the first spacer 31f in the central region deforms, providing a core buffer space for the expansion of the battery 10. The multiple second spacers 32d maintain the overall shape stability and prevent excessive deformation of the battery 10.

[0051] Back Figure 3 The first spacer 31 can be made of MPP. Based on this material, structural support can be provided for two adjacent batteries 10, applying a higher initial interface pressure and reducing gas generation in the early stages of cycling.

[0052] Back Figure 3The second spacer 32 can be made of pre-oxidized fiber aerogel, ceramic fiber aerogel, glass fiber aerogel, nanocomposite plate, phase change material, or phase change thermal insulation composite material. Based on these materials, it can better absorb the deformation of the two adjacent batteries 10, providing a buffer space for the expansion of the battery 10.

[0053] Back Figure 2 Multiple batteries 10 can be prismatic batteries 10. When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer 30 satisfies: 3% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer 30 satisfies: 55% ≤ α ≤ 75%. The prismatic battery 10 has high rigidity and limited self-deformation capability. At 0.2 MPa pressure, the compressibility α of the spacer 30 is in the range of 3% to 20%, providing sufficient reaction force to apply a high initial interfacial pressure to the prismatic battery 10, effectively suppressing electrolyte decomposition and gas generation. At 0.6 MPa pressure, the compressibility α is in the range of 55% to 75%. The spacer 30 can absorb the overall expansion stress of the battery 10 through its own deformation, providing the main buffer space for the limited deformation of the prismatic battery 10, avoiding large mechanical stress caused by direct compression between rigid casings, and protecting the internal structural integrity of the battery 10.

[0054] Back Figure 2 Multiple batteries 10 can be pouch cells 10. When subjected to a pressure of 0.2 MPa, the compression ratio α of the spacer 30 satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compression ratio α of the spacer 30 satisfies: 65% ≤ α ≤ 85%. The pouch cell 10 has high flexibility and large deformation capacity. At 0.2 MPa pressure, the compression ratio α of the spacer 30 is in the range of 10% to 30%, which provides sufficient interfacial pressure to suppress electrolyte decomposition and gas generation, while avoiding excessive stiffness that restricts the inherent slight deformation of the pouch cell 10, thus protecting the interfacial integrity of the internal structure of the battery 10. At 0.6 MPa pressure, the compression ratio α is in the range of 65% to 85%. At this point, the pouch cell 10 undergoes significant volume expansion in the later stages of cycling. The spacer 30, through its own large deformation, fully absorbs the overall expansion stress of the battery 10, providing sufficient buffer space for the battery 10 and avoiding local stress concentration or damage to the encapsulation aluminum film due to excessive constraint.

[0055] Back Figure 1 Multiple batteries 10 can be high-manganese lithium iron phosphate batteries 10. The positive electrode active material in the battery 10 is lithium manganese iron phosphate, in which manganese content is relatively high, which can effectively improve the working voltage platform and overall mass energy density of the battery 10, while maintaining the inherent high safety and stability of phosphate materials.

[0056] <Example Electrical Equipment>

[0057] This utility model embodiment also provides an electrical device 200, which may include the battery pack 100 described above.

[0058] By way of example only, electrical equipment 200 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.

[0059] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0060] In a non-restrictive example, refer to Figure 12 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0061] 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.

[0062] 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.

[0063] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first spacer and a second spacer), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0064] 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.

[0065] 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 stacked along a first direction, with the two large faces of any two adjacent batteries facing each other; The housing includes a battery compartment for accommodating the multiple batteries; as well as A spacer is disposed between the two batteries and in contact with the two large surfaces, wherein... When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 0.5% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 55% ≤ α ≤ 85%.

2. The battery pack according to claim 1, characterized in that, The spacer is a first spacer integrally formed, and the first spacer is in the shape of a pad.

3. The battery pack according to claim 2, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 5% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 55% ≤ α ≤ 75%.

4. The battery pack according to claim 1, characterized in that, The spacer consists of a first spacer and a second spacer, both of which are cushion-shaped and stacked along the first direction.

5. The battery pack according to claim 4, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 2% ≤ α ≤ 25%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 60% ≤ α ≤ 80%.

6. The battery pack according to claim 1, characterized in that, The spacer consists of a first spacer and two second spacers, both of which are pad-shaped. The first spacer and the two second spacers are stacked along the first direction, and the two second spacers are located on opposite sides of the first spacer in the first direction.

7. The battery pack according to claim 5, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 0.5% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 70% ≤ α ≤ 85%.

8. The battery pack according to claim 1, characterized in that, The spacer is composed of a plurality of first spacers, each of which is strip-shaped and is arranged at intervals on an arrangement plane perpendicular to the first direction.

9. The battery pack according to claim 8, characterized in that, The plurality of first spacers all extend along the second direction, and the plurality of first spacers are arranged at intervals along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

10. The battery pack according to claim 8, characterized in that, The plurality of first spacers are arranged at intervals along the second direction, and the plurality of first spacers all extend along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

11. The battery pack according to any one of claims 8 to 10, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 60% ≤ α ≤ 75%.

12. The battery pack according to claim 1, characterized in that, The spacer consists of a plurality of first spacers and a second spacer. The plurality of first spacers are strip-shaped, and the second spacer is pad-shaped. The plurality of first spacers are located on one side of the second spacer in the first direction, and the plurality of first spacers are arranged at intervals on an arrangement plane perpendicular to the first direction.

13. The battery pack according to claim 12, characterized in that, The plurality of first spacers all extend along the second direction, and the plurality of first spacers are arranged at intervals along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

14. The battery pack according to claim 12, characterized in that, The plurality of first spacers are arranged at intervals along the second direction, and the plurality of first spacers all extend along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

15. The battery pack according to any one of claims 12 to 14, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 5% ≤ α ≤ 25%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 65% ≤ α ≤ 80%.

16. The battery pack according to claim 1, characterized in that, The spacer consists of a plurality of first spacers and a second spacer. The plurality of first spacers are strip-shaped, and the second spacer is pad-shaped. The plurality of first spacers are divided into multiple pairs of first spacers. Each pair of first spacers is located on opposite sides of the second spacer in the first direction and is directly opposite to it in the first direction. The multiple pairs of first spacers are arranged at intervals on an arrangement plane perpendicular to the first direction.

17. The battery pack according to claim 16, characterized in that, Each first spacer extends along a second direction, and the plurality of pairs of first spacers are spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

18. The battery pack according to claim 16, characterized in that, The plurality of pairs of first spacers are arranged at intervals along the second direction, and each first spacer extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other, and each of the batteries has an electrode post on one end face of the third direction.

19. The battery pack according to any one of claims 16 to 18, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 2% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 75% ≤ α ≤ 85%.

20. The battery pack according to claim 1, characterized in that, The spacer is a first spacer integrally formed, the first spacer being in the shape of a pad. The battery pack also includes a plurality of second spacers located between the two batteries, the plurality of second spacers being in the shape of strips, the plurality of second spacers forming a frame surrounding the first spacer.

21. The battery pack according to claim 20, characterized in that, When subjected to a pressure of 0.2 MPa, the compressibility α of the spacer satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compressibility α of the spacer satisfies: 65% ≤ α ≤ 85%.

22. The battery pack according to claim 2, characterized in that, The first spacer is made of MPP.

23. The battery pack according to claim 4, characterized in that, The material of the second spacer is one of the following: pre-oxidized fiber aerogel, ceramic fiber aerogel, glass fiber aerogel, nanocomposite board, phase change material, and phase change thermal insulation composite material.

24. The battery pack according to claim 1, characterized in that, The plurality of batteries are prismatic batteries. When subjected to a pressure of 0.2 MPa, the compression ratio α of the spacers satisfies: 3% ≤ α ≤ 20%; when subjected to a pressure of 0.6 MPa, the compression ratio α of the spacers satisfies: 55% ≤ α ≤ 75%.

25. The battery pack according to claim 1, characterized in that, The plurality of batteries are pouch cells. When subjected to a pressure of 0.2 MPa, the compression ratio α of the spacers satisfies: 10% ≤ α ≤ 30%; when subjected to a pressure of 0.6 MPa, the compression ratio α of the spacers satisfies: 65% ≤ α ≤ 85%.

26. The battery pack according to claim 1, characterized in that, The batteries are high-manganese lithium iron phosphate batteries.

27. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 26.

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