Battery pack and powered device

Abstract

The present disclosure provides a battery pack. The battery pack comprises a box, a plurality of batteries and a plurality of buffer frames. The box is internally provided with a battery compartment. The plurality of batteries are arranged in the thickness direction in the battery compartment. Each buffer frame is arranged between two adjacent batteries. The inner side of the buffer frame is formed with a frame space. The buffer frame is provided with a plurality of grooves, each groove is recessed from one side of the thickness direction of the buffer frame and extends from the inner side to the outer side of the buffer frame. The circumference of the buffer frame is C, in mm, the sum of the dimensions of the plurality of grooves along the circumference direction of the buffer frame is L, in mm, and 0.0002≤L / C≤0.98. Accordingly, when the plurality of batteries are stacked and assembled or the battery expands, the gas in the frame space can be effectively discharged through the grooves, avoiding excessive pressure in the frame space, thereby preventing the buffer frame from deforming or even overflowing the surface of the battery due to excessive pressure in the frame space, so that the buffering and supporting effect of the buffer frame on the adjacent battery is reduced.

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] In a battery pack, when batteries expand in volume or are subjected to external impacts such as vibration, adjacent batteries will collide and be squeezed together. To address this, a buffer frame is placed between adjacent batteries to prevent direct rigid contact and reduce the risk of battery casing deformation or internal structural damage. However, when multiple batteries are stacked or when batteries expand, the buffer frame can come into close contact with the surfaces of two adjacent batteries. This increases the pressure within the sealed air cavity formed between the buffer frame and the adjacent batteries, causing the buffer frame to deform or even be squeezed out of the battery gaps and spill onto the battery surface. This not only makes assembly difficult but also affects the overall structural stability and safety performance of the battery pack. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem of deformation of the buffer frame or even overflow of the battery surface caused by excessive pressure in the sealed air cavity in conventional battery packs.

[0004] The battery pack disclosed herein includes a housing, multiple batteries, and multiple buffer frames. A battery compartment is provided within the housing. Multiple batteries are arranged along the thickness direction within the battery compartment. Each buffer frame is located between two adjacent batteries. An inner space is formed on the inner side of each buffer frame. Multiple grooves are provided on each buffer frame, each groove being recessed from one side along the thickness direction of the buffer frame and extending from the inner side to the outer side of the buffer frame. The perimeter of the buffer frame is C (in mm), and the sum of the dimensions of the multiple grooves along the perimeter of the buffer frame is L (in mm), where 0.0002 ≤ L / C ≤ 0.98.

[0005] In this disclosure, by providing a groove extending from the inner side to the outer side of the buffer frame, when multiple batteries are stacked or the batteries expand, the gas in the space inside the frame can be effectively discharged through the groove, avoiding excessive pressure in the space inside the frame. This prevents the buffer frame from deforming or even overflowing onto the battery surface due to excessive pressure in the space inside the frame, thereby reducing the buffering and supporting effect of the buffer frame on adjacent batteries.

[0006] Based on this, the sum of the dimensions L of the multiple grooves along the perimeter of the buffer frame and the perimeter C of the buffer frame are limited to a reasonable range of 0.0002 to 0.98. If the ratio L / C is too large, that is, the sum of the dimensions L of the multiple grooves along the perimeter of the buffer frame is relatively large, it will excessively weaken the structure of the buffer frame. When multiple batteries are stacked or subjected to battery expansion force, the buffer frame is easily compressed and deformed by the batteries, resulting in the grooves being too small in the thickness direction. This makes the exhaust channels provided by the grooves too small, thus preventing the gas in the frame space from being discharged quickly and effectively. If the ratio L / C is too small, that is, the sum of the dimensions L of the multiple grooves along the perimeter of the buffer frame is relatively small, either the number of grooves on the buffer frame is small, or the dimension of each groove along the perimeter of the buffer frame is small. This will reduce the efficiency of gas discharge from the frame space to the outside, making it impossible for the gas in the frame space to be discharged to the outside in time, and still resulting in excessive pressure in the frame space.

[0007] This disclosure also provides an electrical device that includes the aforementioned battery pack. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 for Figure 1 A schematic diagram of the buffer frame of the battery pack.

[0013] Figure 3 This is a schematic diagram of the structure of the battery and buffer frame of a battery pack according to another embodiment of the present disclosure.

[0014] Figure 4 This is a schematic diagram of the structure of the buffer frame of a battery pack according to another embodiment of the present disclosure.

[0015] Figure 5 This is a schematic diagram of the structure of the buffer frame of a battery pack according to another embodiment of the present disclosure.

[0016] Figure 6 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0017] Figure Labels Battery pack - 100; Battery - 10; Box - 20; Storage space - 21; Top cover - 22; Buffer frame - 30; Internal space of the frame - 301; Frame - 302; Corner - 303; Top frame - 31; Side frame - 32; Bottom frame - 33; Groove - 40; First groove - 41; Second groove - 42; Heat insulation pad - 50; Electrical equipment - 200. Detailed Implementation

[0018] 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.

[0019] <Example Battery Pack> refer to Figure 1 According to an embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple batteries 10 connected in series and parallel, and integrate 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 22, forming a complete functional unit capable of directly outputting electrical energy. The housing 20 has a receiving space 21, which may include a battery compartment and an electrical compartment. Multiple batteries 10 are arranged along the thickness direction within the battery compartment. The electrical compartment is used to house components such as the BMS. The housing 20 effectively prevents external collisions, compression, and vibrations from affecting the multiple batteries 10 and other components such as the BMS inside the housing 20. Furthermore, the housing 20 also prevents external moisture or dust and other contaminants from entering the interior of the housing 20. 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. For ease of description, in the accompanying drawings of this disclosure, X is used to indicate the thickness direction.

[0020] 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.

[0021] 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.

[0022] Battery 10 is the basic energy storage unit in battery pack 100, 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. 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.

[0023] The battery pack 100 may also include multiple buffer frames 30. Each buffer frame 30 is disposed between two adjacent batteries 10. The buffer frames 30 can provide expansion space for the batteries 10, and can also absorb and disperse the mechanical stress generated by the volume expansion of the batteries 10 during charging and discharging, preventing the battery casings from being directly squeezed against each other, thus preventing deformation or damage. When subjected to external impact or vibration, the buffer frames 30 can also reduce the collision between batteries, reducing the risk of internal structural damage.

[0024] Combination Figure 2 and Figure 3 The buffer frame 30 can directly contact two adjacent batteries. An inner space 301 is formed on the inner side of the buffer frame 30. The buffer frame 30 has a plurality of grooves 40. Each groove 40 is recessed from one side of the buffer frame 30 in the thickness direction and extends from the inner side to the outer side of the buffer frame 30. In some embodiments, the groove 40 can be rectangular. In other embodiments, the groove 40 can be arc-shaped. In other embodiments, the groove 40 can also be other shapes. This disclosure does not limit its shape. The perimeter of the buffer frame 30 is C, in mm. The plurality of grooves 40 may include n grooves 40 provided on the buffer frame 30, and the dimensions of the n grooves 40 along the perimeter of the buffer frame 30 can be the same or different. The dimensions of the plurality of grooves 40 along the perimeter of the buffer frame 30 can be a1~an, in mm, and the sum of the dimensions of the plurality of grooves along the perimeter of the buffer frame is L, in mm, where L = a1 + a2 + a3 + ... + an. 0.0002 ≤ L / C ≤ 0.98. Preferably, 0.002 ≤ L / C ≤ 0.7. More preferably, 0.02 ≤ L / C ≤ 0.5. Alternatively, the ratio L / C can also be 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, or 0.9. By way of example only, 440mm ≤ C ≤ 3000mm, and / or, 0.5mm ≤ L ≤ 2900mm. The buffer frame can be made of silicone, epoxy resin, or mica board.

[0025] In this disclosure, by providing a groove 40 extending from the inner side to the outer side of the buffer frame 30, when multiple batteries 10 are stacked or when the batteries 10 expand, the gas in the space 301 inside the frame can be effectively discharged through the groove 40, avoiding excessive pressure in the space 301 inside the frame. This prevents the buffer frame 30 from deforming or even overflowing onto the surface of the batteries 10 due to excessive pressure in the space 301 inside the frame, thereby reducing the buffering and supporting effect of the buffer frame 30 on adjacent batteries 10.

[0026] Based on this, the sum of the dimensions L of the multiple grooves 40 along the perimeter of the buffer frame 30 and the perimeter C of the buffer frame 30 are limited to a reasonable range of 0.0002 to 0.98. If the ratio L / C is too large, that is, the sum of the dimensions L of the multiple grooves 40 along the perimeter of the buffer frame 30 is relatively large, it will excessively weaken the structure of the buffer frame 30. When multiple batteries 10 are stacked or subjected to battery expansion force, the buffer frame 30 is easily compressed and deformed by the battery, resulting in the dimension of the grooves 40 being too small in the thickness direction. This makes the exhaust channel provided by the grooves 40 too small, thus preventing the gas in the space 301 inside the frame from being discharged quickly and effectively. If the ratio L / C is too small, that is, the sum of the dimensions L of multiple grooves along the perimeter of the buffer frame is relatively small, either the number of grooves 40 provided on the buffer frame 30 is small, or the dimension of each groove 40 along the perimeter of the buffer frame 30 is small. This will reduce the efficiency of the gas in the frame space 301 to be discharged to the outside, so that the gas in the frame space 301 cannot be discharged to the outside in time, and the pressure in the frame space 301 will still be too high.

[0027] refer to Figure 1 The battery pack 100 may also include a heat insulation pad 50. The heat insulation pad 50 and the buffer frame 30 are stacked between the two batteries 10, and multiple recesses 40 are located on the side of the buffer frame 30 opposite to the heat insulation pad 50.

[0028] Since the battery 10 generates heat during charging and discharging, and the heat generated by the battery 10 causes the heat insulation pad 50 to expand, by providing multiple grooves 40 on the side of the buffer frame 30 away from the heat insulation pad 40, it is possible to prevent the heat insulation pad 50 from blocking the grooves 40 when it expands due to heat or deforms under pressure, ensuring the reliability of the venting function of the grooves 40, thereby allowing the gas in the space 301 inside the frame to be effectively discharged.

[0029] refer to Figure 2 and Figure 3 The buffer frame 30 includes multiple strip-shaped frames 302. The multiple frames 302 include a top frame 31, a bottom frame 33, and two side frames 32, each side frame 32 having at least one groove 40.

[0030] During the assembly of the battery pack 100, electrical connections are typically made to the terminals of the batteries 10 using electrical connectors via welding or bolting, thereby connecting multiple batteries 10 in series or parallel. Since the terminals and other electrical connectors are usually located near the top frame 31, loosening or friction at the connection points during external impacts such as vibration can generate metal debris and other impurities. If these impurities enter the frame space 301 through the groove 40, they will directly contact the batteries 10, potentially causing short circuits or localized overheating, thus affecting the performance and reliability of the batteries 10. Furthermore, during the assembly of the battery pack 100, adhesive is typically applied to the bottom of the casing 20 to securely connect the batteries 10 to the casing 20. Since the adhesive forms a rigid structure after curing, if the adhesive enters the frame space 301 through the groove 40, the battery 10 will directly contact this rigid structure during charging and discharging, 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, thereby affecting the lifespan and safety of the battery pack 100. Therefore, the battery pack 100 with the above-mentioned structure ensures the unobstructed flow and venting function of the groove 40, and effectively prevents impurities such as adhesive or metal debris from entering the frame space 301 through the groove 40, thus avoiding any impact on the performance of the battery 10.

[0031] refer to Figure 3 The length of the side frame 32 is L1 (mm), and the sum of the dimensions of at least one groove 40 along the length of the side frame 32 is L2 (mm), where L2 < L1. 40mm ≤ L1 ≤ 296mm, and / or 0.5mm ≤ L2 ≤ 10mm. Taking a side frame 32 with two grooves 40 as an example, where the dimensions of the two grooves 40 along the length of the side frame 32 are b1 and b2 respectively, then L2 = b1 + b2. In the accompanying drawings of this disclosure, Y indicates the width direction, and Z indicates the length direction of the side frame 32. The thickness direction, width direction, and length direction are all perpendicular to each other.

[0032] Since the sum of the dimensions L2 of at least one groove 40 along the length of the side frame 32 is less than the length L1 of the side frame 32, the groove 40 on the side frame 32 can be used to discharge gas from the internal space 301 to the outside, reducing the risk of deformation of the buffer frame 30 or overflow onto the battery surface due to excessive pressure in the internal space 301. At the same time, the side frame 32 can also provide cushioning and support for the battery 10.

[0033] refer to Figure 3The distance D1 from at least one groove 40 to the bottom frame 33 is measured in mm, and 0.17 ≤ D1 / L1 ≤ 0.675. Preferably, 0.23 ≤ D1 / L1 ≤ 0.58. More preferably, 0.36 ≤ D1 / L1 ≤ 0.45. Alternatively, the ratio D1 / L1 can also be 0.26, 0.3, 0.43, 0.54, or 0.62. By way of example only, 40mm ≤ L1 ≤ 296mm, and / or 50mm ≤ D1 ≤ 200mm. It should be noted that D1 is the distance from the groove 40 closest to the bottom frame 33 along the length direction of the side frame 32 to the bottom frame 33.

[0034] If the ratio D1 / L1 is too large, meaning the distance D1 between at least one groove 40 and the bottom frame 33 is relatively large, then the groove 40 is too far from the bottom frame 33. This will cause a difference in the venting capacity between the area near the bottom frame 33 and the area far from the bottom frame 33 within the frame space 301. Because the area near the bottom frame 33 is far from the groove 40, the gas in the area near the bottom frame 33 cannot be vented in time. If the ratio D1 / L1 is too small, meaning the distance D1 between at least one groove 40 and the bottom frame 33 is relatively small, then during the assembly of the battery pack 100, the adhesive at the bottom of the casing can easily enter the frame space 301 through the groove 40. When the battery 10 expands during charging and discharging, the battery 10 will directly contact the rigid structure formed by the cured adhesive, generating mechanical stress. This causes localized stress concentration on the battery surface, resulting in deformation of the battery casing or damage to the internal structure of the battery, thereby affecting the service life and safety performance of the battery pack 100. If the ratio D1 / L1 is too small, it may cause the glue to clog the groove, thus affecting the venting of the groove 40. Therefore, within the reasonable range of 0.17≤D1 / L1≤0.675, the time for the gas in the frame space 301 to be discharged through the groove 40 can be more even, and glue can be prevented from entering the frame space 301 through the groove 40, so that the gas in the frame space 301 can be discharged in a timely and effective manner.

[0035] In another embodiment, reference Figure 4 The side frame 32 forms a groove 40.

[0036] Based on the above structure, by forming the side frame 32 as a single recess 40, the processing technology is simplified and production efficiency is improved. It also prevents impurities such as glue and metal shavings from entering the frame space 301 through the recess 40, thus enhancing the safety and reliability of the battery 10.

[0037] In another embodiment, reference Figure 3 Multiple grooves 40 are all located on the two side frames 32.

[0038] During the assembly of the battery pack 100, electrical connections are typically made to the terminals of the batteries 10 using electrical connectors via welding or bolting, thereby connecting multiple batteries 10 in series or parallel. Since the terminals and other electrical connectors are usually located near the top frame 31, loosening or friction at the connection points during external impacts such as vibration can generate metal debris and other impurities. Based on the above structure, by placing multiple grooves 40 on both side frames 32, problems such as battery short circuits or localized overheating caused by metal debris entering the frame space 301 through the grooves 40 can be avoided, thus ensuring the performance and reliability of the batteries 10. Furthermore, during the assembly of the battery pack 100, adhesive is typically applied to the bottom of the casing to securely connect the batteries 10 to the casing 20. By placing multiple grooves 40 on both side frames 32, mechanical stress can be avoided from being generated when the battery 10 expands during charging and discharging due to the glue entering the frame space 301 through the grooves 40 and coming into hard contact with the rigid structure formed by the glue. This prevents stress concentration on the surface of the battery 10 from causing deformation of the casing or damage to the internal structure, thus ensuring the service life and safety of the battery pack 100.

[0039] In another embodiment, reference Figure 2 The buffer frame 30 includes multiple strip-shaped frames 302. The multiple frames 302 include a top frame 31, a bottom frame 33, and two side frames 32. The top frame 31 is provided with at least one groove 40.

[0040] According to the above structure, by providing at least one groove 40 on the top frame 31, it is possible to effectively prevent the adhesive applied to the bottom of the box from entering the frame space 301 through the groove on the top frame 31, thus preventing the cured adhesive from directly contacting the battery 10 and affecting the battery performance. It can also prevent the adhesive from clogging the groove 40, thereby ensuring the venting function of the groove 40 and improving the reliability of the buffer frame 30.

[0041] In another embodiment, reference Figures 2 to 5 The buffer frame 30 includes multiple strip-shaped frames 302. The multiple frames 302 include a top frame 31, a bottom frame 33, and two side frames 32. The bottom frame 33 does not have a groove.

[0042] According to the above structure, since there is no groove on the bottom frame 33, the glue at the bottom of the box can be effectively prevented from entering the frame space 301 through the groove 40, thereby preventing the cured glue from directly contacting the battery 10 and affecting the battery performance.

[0043] In another embodiment, reference Figure 3 The buffer frame 30 includes multiple strip-shaped frames 302. A corner portion 303 is formed between two adjacent frames 302, and multiple grooves 40 are all provided on the multiple frames 302.

[0044] When the buffer frame 30 is subjected to external loads such as compression and vibration, stress concentration is likely to occur in the corner 303. Furthermore, the corner 303 also needs to withstand combined loads from different directions, making the stress on the corner 303 greater than that on the frame 302. If the groove 40 is located on the corner 303, the groove 40 is prone to deformation under the greater stress in the corner 303, potentially leading to deformation, breakage, or even closure of the groove 40, thus preventing the effective release of gas from the space 301 within the frame. Therefore, the battery pack 100 with the above-described structure, by placing all the grooves 40 on multiple frames 302, can effectively reduce the risk of deformation or closure of the grooves 40, thereby improving the reliability of the battery pack 100.

[0045] In another embodiment, reference Figure 3 The distance from corner 303 to the nearest recess 40 is D2, in mm, and D2 ≥ 10 mm. In some embodiments, 10 mm ≤ D2 ≤ 40 mm.

[0046] If the distance D2 from the corner 303 to the nearest groove 40 is too small, that is, the groove 40 is closer to the corner 303, the groove 40 is more susceptible to the greater stress of the corner 303. When squeezed, the groove 40 may deform or narrow, thereby affecting its ventilation and efficiency.

[0047] refer to Figures 2 to 4 The buffer frame 30 may include multiple strip-shaped frame bodies 302. Multiple grooves 40 are located on the same side of the buffer frame 30 in the thickness direction, that is, multiple grooves 40 are located on the same side of the frame bodies 302 in the thickness direction.

[0048] Since the multiple grooves 40 are located on the same side of the frame 302 in the thickness direction, the manufacturing process only requires machining on one side of the frame 302 to complete the manufacturing of the multiple grooves 40. This effectively simplifies the processing steps and improves production efficiency.

[0049] In another embodiment, reference Figure 5 The buffer frame 30 may include a plurality of strip-shaped frame bodies 302. The plurality of grooves 40 include at least one first groove 41 and at least one second groove 42. At least one first groove 41 is located on one side of the buffer frame 30 in the thickness direction, and at least one second groove 42 is located on the other side of the buffer frame 30 in the thickness direction. That is, at least one first groove 41 is located on one side of the frame body 302 in the thickness direction, and at least one second groove 42 is located on the other side of the frame body 302 in the thickness direction.

[0050] According to the above structure, by distributing multiple grooves 40 on both sides of the frame 302 in the thickness direction, the gas discharge efficiency of the space 301 inside the frame can be effectively improved. When one side is blocked due to external obstruction, the groove on the other side can still remain unobstructed, ensuring the discharge of gas from the space inside the frame and improving the reliability of the grooves 40.

[0051] In another embodiment, reference Figure 5 At least one first groove 41 and at least one second groove 42 are arranged alternately along the perimeter of the buffer frame 30.

[0052] By staggering the grooves 40 on both sides of the frame 302 in the thickness direction, this structure can disperse the structural weakening points caused by the slotting, ensuring the rigidity and strength of the frame structure, preventing deformation or fracture that may occur under pressure, and ensuring the integrity of the structure. At the same time, it can also improve the gas discharge efficiency inside the frame.

[0053] In another embodiment, reference Figure 2 The thickness of the buffer frame 30 is T1, in mm. The depths of the multiple grooves 40 on the buffer frame 30 can be the same or different. It should be noted that the depth of the groove 40 refers to its dimension in the thickness direction. The maximum depth among the multiple grooves 40 is H1, in mm, where 0.01 ≤ H1 / T1 ≤ 0.95. Preferably, 0.1 ≤ H1 / T1 ≤ 0.85. More preferably, 0.4 ≤ H1 / T1 ≤ 0.6. Alternatively, the ratio H1 / T1 can also be 0.05, 0.2, 0.3, 0.5, 0.7, 0.8, or 0.9. By way of example only, 0.1 mm ≤ H1 ≤ 2 mm, and / or, 0.2 mm ≤ H1 ≤ 10 mm.

[0054] If the ratio H1 / T1 is too small, meaning the maximum depth H1 among the multiple grooves 40 is relatively small (i.e., all grooves 40 are too shallow), the grooves 40 are prone to closing when the buffer frame 30 is deformed under pressure, preventing gas from escaping through the grooves 40. If the ratio H1 / T1 is too large, meaning the maximum depth H1 among the multiple grooves 40 is relatively large, small debris or dust can easily enter the space 301 through the grooves 40, affecting battery performance. Furthermore, excessive depth of the grooves 40 can also excessively weaken the structure of the buffer frame, reducing its buffering and supporting effect on the battery. Therefore, within the reasonable range of 0.01 ≤ H1 / T1 ≤ 0.95, the weakening effect of the grooves 40 on the structure of the buffer frame 30 is minimal, ensuring that the buffer frame 30 effectively provides buffering and support. A battery pack with the above structure can also reduce the impact on the grooves 40 when the buffer frame 30 is deformed under pressure, ensuring the reliability of gas venting from the grooves 40.

[0055] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0056] 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.

[0057] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0058] In a non-restrictive example, refer to Figure 6 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.

[0059] 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.

[0060] 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.

[0061] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first groove and the second groove), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0062] 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.

[0063] 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: The casing contains a battery compartment. Multiple batteries are arranged along the thickness direction within the battery compartment; as well as Multiple buffer frames are provided, each buffer frame being disposed between two adjacent batteries. An inner space is formed on the inner side of each buffer frame. Multiple grooves are provided on each buffer frame. Each groove is recessed from one side of the buffer frame in the thickness direction and extends from the inner side of the buffer frame to its outer side. The perimeter of the buffer frame is C in mm. The sum of the dimensions of the multiple grooves along the perimeter of the buffer frame is L in mm, where 0.0002 ≤ L / C ≤ 0.

98.

2. The battery pack according to claim 1, characterized in that, The buffer frame includes multiple strip-shaped frames, each including a top frame, a bottom frame, and two side frames, with at least one groove on each side frame.

3. The battery pack according to claim 2, characterized in that, The length of the side frame is L1, in mm, and the sum of the dimensions of the at least one groove along the length of the side frame is L2, in mm, where L2 < L1.

4. The battery pack according to claim 3, characterized in that, The distance from the at least one groove to the bottom frame is D1, in mm, and 0.17≤D1 / L1≤0.

675.

5. The battery pack according to claim 4, characterized in that, 40mm≤L1≤296mm, and / or, 0.5mm≤L2≤10mm, and / or, 50mm≤D1≤200mm.

6. The battery pack according to claim 2, characterized in that, The side frame is formed as a whole into a groove.

7. The battery pack according to any one of claims 2 to 6, characterized in that, All of the multiple grooves are provided on the two side frames.

8. The battery pack according to claim 1, characterized in that, The buffer frame includes multiple strip-shaped frames, each including a top frame, a bottom frame, and two side frames, with at least one groove on the top frame.

9. The battery pack according to claim 1, characterized in that, The buffer frame includes multiple strip-shaped frames, including a top frame, a bottom frame, and two side frames. The bottom frame does not have a groove.

10. The battery pack according to claim 1, characterized in that, The buffer frame includes multiple strip-shaped frames, with corners formed between adjacent frames, and all of the multiple grooves are provided on the multiple frames.

11. The battery pack according to claim 10, characterized in that, The distance from the corner to the nearest groove is D2, in mm, and D2 ≥ 10 mm.

12. The battery pack according to claim 1, characterized in that, The plurality of grooves are located on the same side of the buffer frame in the thickness direction.

13. The battery pack according to claim 1, characterized in that, The plurality of grooves includes at least one first groove and at least one second groove, the at least one first groove being located on one side of the buffer frame in the thickness direction, and the at least one second groove being located on the other side of the buffer frame in the thickness direction.

14. The battery pack according to claim 13, characterized in that, The at least one first groove and the at least one second groove are arranged alternately along the perimeter of the buffer frame.

15. The battery pack according to claim 1, characterized in that, It also includes a heat insulation pad, which is stacked with the buffer frame between the two batteries, and the plurality of grooves are located on the side of the buffer frame away from the heat insulation pad.

16. The battery pack according to claim 1, characterized in that, The thickness of the buffer frame is T1 in mm, and the maximum depth of the plurality of grooves is H1 in mm, where 0.01 ≤ H1 / T1 ≤ 0.

95.

17. The battery pack according to claim 1, characterized in that, 0.1mm≤H1≤2mm, and / or, 0.2mm≤ / T1≤10mm.

18. The battery pack according to claim 1, characterized in that, 440mm≤C≤3000mm, and / or, 0.5mm≤L≤2900mm.

19. The battery pack according to claim 1, characterized in that, The buffer frame is made of silicone, epoxy resin or mica board.

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

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