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 box space. The plurality of batteries are arranged in the box space. The plurality of buffer frames are respectively arranged between two adjacent batteries. Each buffer frame comprises a plurality of frame bodies. The plurality of frame bodies and two opposite surfaces of the two adjacent batteries jointly enclose an inner space. The plurality of frame bodies comprise two adjacent frame bodies which are arranged in a spaced manner to form a gas passage which communicates the inner space with an outer space of the buffer frame. Accordingly, by arranging the two adjacent frame bodies in a spaced manner, the gas passage which communicates the inner space with the outer space is formed. When the batteries are stacked or swell, the gas in the inner space can be discharged to the outer space through the gas passage, which can effectively avoid the excessive pressure in the inner space, thereby preventing the deformation of the buffer frame due to the excessive pressure in the inner space and even the overflow of the battery surface, and ensuring the buffering and supporting effect of the buffer frame.

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, adjacent batteries are prone to collision and compression when they expand in volume or are subjected to external impacts such as vibration. To address this, a buffer frame is typically placed between adjacent batteries to reduce rigid contact and prevent deformation or damage to the battery casing due to direct compression, thus reducing the risk of internal structural damage. However, because the buffer frame forms a sealed space by tightly adhering to the surface of adjacent batteries under pressure, excessive pressure within this sealed space can occur during the stacking and assembly of multiple batteries or during battery expansion. This can cause the buffer frame to deform or even overflow from the battery surface. This not only makes assembly difficult but also affects the buffer frame's cushioning and support function, reducing the overall stability and safety of the battery pack structure. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem of the buffer frame being deformed under pressure or even overflowing onto the battery surface in conventional battery packs.

[0004] The battery pack disclosed herein includes a housing, multiple batteries, and multiple buffer frames. The housing contains an internal space. The multiple batteries are disposed within the internal space. Multiple buffer frames are disposed between two adjacent batteries. Each buffer frame includes multiple frame sections. The multiple frame sections and the two opposite faces of two adjacent batteries together enclose an inner space. The multiple frame sections include two adjacent frame sections, spaced apart to form a gas channel connecting the inner space to the outer space of the buffer frame.

[0005] According to the above structure, by arranging two adjacent frames at intervals, a gas channel is formed connecting the inner and outer spaces. During battery stacking or expansion, gas in the inner space can be discharged to the outer space through this gas channel, effectively preventing excessive pressure in the inner space. Therefore, the battery pack with this structure can effectively prevent the buffer frame from deforming or even being squeezed out of the battery gaps and overflowing onto the battery surface due to excessive pressure in the inner space, ensuring the buffer frame's cushioning and supporting function for adjacent batteries.

[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 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 of the battery and buffer frame of the battery pack.

[0012] 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.

[0013] Figure 4 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 5 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.

[0015] Figure 6 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.

[0016] Figure 7 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.

[0017] Figure 8 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.

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

[0019] Figure Labels Battery pack - 100; Battery - 10; Box body - 20; Internal space - 21; Top cover - 22; Buffer frame - 30; Top frame - 31; Side frame - 32; Bottom frame - 33; Gas passage - 40; Electrical equipment - 200. Detailed Implementation

[0020] 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.

[0021] <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 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, which includes a bottom plate and side walls connected together. The bottom plate is located at the bottom of the side walls and together with the side walls forms an internal space 21. The aforementioned components are housed within the internal space 21 of the housing 20 and sealed by a top cover 22, forming a complete functional unit capable of directly outputting electrical energy. 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.

[0022] 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.

[0023] 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.

[0024] 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. In battery pack 100, multiple batteries 10 are arranged along the thickness direction in the internal space 21. 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 can also be other types of batteries. This disclosure does not limit its type.

[0025] The battery pack 100 may also include multiple buffer frames 30. The multiple buffer frames 30 are respectively disposed between two adjacent batteries 10. The buffer frames 30 can provide expansion space for the batteries 10, and can also effectively absorb and disperse the mechanical stress generated by the volume expansion of the batteries 10 during charging and discharging, preventing the battery casings from directly squeezing each other and causing deformation or damage. When subjected to external impact or vibration, the buffer frames 30 can also mitigate the mutual collision between batteries, reducing the risk of internal structural damage. Each buffer frame 30 may include multiple frames. The multiple frames and the two opposite faces of the two adjacent batteries 10 together enclose an inner space. The multiple frames include two adjacent frames, which are spaced apart to form a gas channel 40 connecting the inner space with the outer space of the buffer frame 30.

[0026] According to the above structure, by arranging two adjacent frames at intervals, a gas channel 40 is formed connecting the inner and outer spaces. During battery stacking or expansion, gas in the inner space can be discharged to the outer space through the gas channel 40, effectively preventing excessive pressure in the inner space. Therefore, the battery pack 100 with the above structure can effectively prevent the buffer frame 30 from deforming or even being squeezed out of the battery gaps and overflowing onto the battery surface due to excessive pressure in the inner space, ensuring the buffer frame 30's buffering and supporting effect on adjacent batteries.

[0027] refer to Figure 2 The battery may include a top frame 31, a bottom frame 33, and two side frames 32. The top frame 31 and bottom frame 33 are spaced apart along the height direction of the battery and perpendicular to that direction. The top frame 31 is higher than the bottom frame 33, meaning it is located on the side of the bottom frame 33 furthest from the bottom plate of the housing. The two side frames 32 are spaced apart along the width direction of the battery and perpendicular to that direction. A gas channel 40 is formed between one side frame 32 and the top frame 31. For ease of description, in the accompanying drawings, X indicates the thickness direction, Y indicates the width direction, and Z indicates the height direction. The thickness, width, and height directions are perpendicular to each other. It should be noted that the height direction is perpendicular to the bottom plate of the housing, and the dimension of the battery 10 in the width direction is larger than its dimension in the thickness direction. Both the top frame 31 and bottom frame 33 extend along the width direction of the battery 10, and both side frames 32 extend along the height direction.

[0028] During the assembly of the battery pack 100, adhesive is typically applied to the bottom of the casing to securely connect the battery 10 to the casing 20. If the adhesive enters the inner space through the gas channel 40, the contact area between the adhesive and the battery 10 will increase. Due to the rigid structure formed after the adhesive cures, when the battery 10 expands, it will make hard contact with the adhesive layer of the rigid structure, causing localized stress concentration on the surface of the battery 10. This can lead to deformation of the battery casing or damage to the internal structure of the battery, thereby affecting the service life and safety of the battery pack 100. Therefore, by forming a gas channel 40 between a side frame 32 and a top frame 31, it is possible to ensure that the gas in the inner space can be discharged through the gas channel 40, and it can also effectively prevent adhesive from entering the inner space through the gas channel 40. This avoids localized stress concentration caused by the hard contact between the battery 10 and the rigid structure, ensuring the service life and reliability of the battery pack 100.

[0029] refer to Figures 3 to 6 Each side frame 32 and the top frame 31 form a gas channel 40.

[0030] According to the above structure, by forming a double-sided gas channel 40 between the two side frames 32 and the top frame 31, the gas in the inner space can be effectively discharged to the outer space of the buffer frame 30 through the double-sided gas channel 40. This can effectively increase the cross-sectional area of ​​the channel used for exhaust, enabling timely and rapid exhaust of the gas in the inner space and improving exhaust efficiency.

[0031] refer to Figure 3 In the width direction of the battery, each end of the top frame 31 protrudes beyond the corresponding side frame 32 and faces the inner side of the inner space.

[0032] During the assembly of the battery pack 100, electrical connections are typically made with the terminals via welding or bolts to connect multiple batteries 10 in series or parallel. When subjected to external impacts such as vibration, loosening or friction at the connection points may generate metal shavings, dust, or other foreign matter. Since the terminals and other electrical connections are usually located near the top frame 31, these foreign objects can easily enter the inner space through the gas channel 40. If these foreign objects enter the inner space through the gas channel 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. Therefore, the battery pack 100 with the above-described structure, by having each end of the top frame 31 protrude outward beyond the inner surface of the corresponding side frame 32, effectively prevents debris, dust, and other foreign objects from entering the inner space through the gas channel 40, while also ensuring the exhaust function of the gas channel 40.

[0033] refer to Figure 4In the width direction of the battery, each end of the top frame 31 protrudes beyond the outer side of the corresponding side frame 32 opposite to its inner side, away from the inner space.

[0034] According to the above structure, by making each end of the top frame 31 protrude outward beyond the outer surface of the corresponding side frame 32, the top frame 31 can effectively block the top of the gas channel 40 in the height direction. This can further prevent debris, dust and other foreign objects falling from the top from entering the inner space through the gas channel 40, while also ensuring the exhaust function of the gas channel 40.

[0035] refer to Figure 3 and Figure 4 The distance between the top frame 31 and the bottom frame 33 is D1, in mm, and the distance between the top of the side frame 32 and the bottom frame 33 is D2, in mm. 0.0345 ≤ D2 / D1 ≤ 0.99, and / or 60 mm ≤ D1 ≤ 290 mm, and / or 10 mm ≤ D2 ≤ 289 mm. Preferably, 0.1 ≤ D2 / D1 ≤ 0.8. More preferably, 0.3 ≤ D2 / D1 ≤ 0.6. Alternatively, the ratio D2 / D1 can also be 0.06, 0.2, 0.4, 0.5, 0.7, or 0.9.

[0036] If the ratio D2 / D1 is too small, meaning the distance D2 from the top of the side frame 32 to the bottom frame 33 is relatively small, the supporting area of ​​the side frame 32 for the battery 10 will be too small. When the battery 10 expands or is subjected to external impacts such as vibration, the buffering and supporting effect of the side frame 32 on the battery 10 will be reduced. This will prevent the side frame 32 from effectively absorbing the stress generated by the battery expansion and from effectively dispersing the external impact force, resulting in excessive mechanical stress on the battery in certain areas, which will affect the battery's service life and safety performance. If the ratio D2 / D1 is too large, meaning the distance D2 from the top of the side frame 32 to the bottom frame 33 is relatively large, the gas channel 40 formed between the side frame 32 and the top frame 31 will be too small, leading to increased flow resistance. This will reduce exhaust efficiency, preventing the gas in the inner space from being discharged in a timely and rapid manner, causing the gas in the inner space to accumulate and not be effectively discharged, which will still result in excessive pressure in the inner space. Therefore, within the reasonable range of 0.0345≤D2 / D1≤0.99, the side frame 32 can effectively buffer and support the battery 10, while improving exhaust efficiency and ensuring that the gas in the inner space can be discharged to the outer space in a timely and rapid manner through the gas channel 40.

[0037] In another embodiment, reference Figure 5 and Figure 6 In the width direction, the inner side of each side frame 32 is located outside the corresponding end of the top frame 31 and is spaced apart from the end.

[0038] According to the above structure, in the width direction, by setting the inner side of each side frame 32 to the outer side of the corresponding end of the top frame 31 and arranging them at intervals from the end, a gas channel 40 is formed between the inner side of each side frame 32 and the corresponding end of the top frame 31. This allows the gas in the inner space to be discharged to the outer space in a timely manner through the gas channel 40, avoiding excessive pressure in the inner space due to gas accumulation. This ensures that the buffer frame 30 can provide cushioning and support when the battery 10 expands or is subjected to external impact, effectively absorbing and dispersing mechanical stress.

[0039] refer to Figure 6 In the height direction, the top of each side frame 32 is lower than the bottom side of the top frame 31 and is spaced apart from the bottom side.

[0040] According to the above structure, in the height direction, by arranging the top of each side frame 32 lower than the bottom side of the top frame 31 and spaced apart from the bottom side, a gas channel 40 is formed between each side frame 32 and the top frame 31. This allows the gas in the inner space to be discharged to the outer space in a timely manner through the gas channel 40, avoiding excessive pressure in the inner space due to gas accumulation. This ensures that the buffer frame 30 can provide cushioning and support when the battery 10 expands or is subjected to external impact, effectively absorbing and dispersing mechanical stress.

[0041] refer to Figure 5 and Figure 6 The distance between the two side frames 32 is D3, in mm, and the length of the top frame 31 is L, in mm. 1.002 ≤ D3 / L ≤ 23.8, and / or 100mm ≤ D3 ≤ 1190mm, and / or 50mm ≤ L ≤ 1180mm. Preferably, 5 ≤ D3 / L ≤ 20. More preferably, 12 ≤ D3 / L ≤ 17. Alternatively, the ratio D3 / L can be 3, 7, 9, 10.5, 14, 15.5, 18, or 22.

[0042] If the ratio D3 / L is too small, meaning the length L of the top frame 31 is relatively large, the gas channel 40 formed between the top frame 31 and the side frame 32 will be too small, leading to increased flow resistance. This will reduce exhaust efficiency, preventing the gas in the inner space from being discharged in a timely and rapid manner, resulting in excessive pressure in the inner space. If the ratio D3 / L is too large, meaning the length L of the top frame 31 is relatively small, the contact area between the top frame 31 and the battery 10 will be too small. When the battery 10 expands or is subjected to external impacts such as vibration, the buffering and supporting effect of the top frame 31 on the battery 10 will be reduced, making it unable to effectively absorb the stress generated by battery expansion or effectively disperse external impact forces. This will cause the battery to bear excessive mechanical stress locally, thereby affecting the service life and safety performance of the battery 10. Therefore, within the reasonable range of 1.002≤D3 / L≤23.8, the top frame 31 can be guaranteed to support and buffer the battery 10, while also improving exhaust efficiency and ensuring that the gas in the inner space can be discharged in a timely and rapid manner through the gas channel 40.

[0043] refer to Figures 2 to 8 The bottom frame 33 has two ends that are respectively connected to or in contact with the two side frames 32. In some embodiments, the bottom frame 33 and the two side frames 32 can be bonded together with an adhesive. In other embodiments, the bottom frame 33 and the two side frames 32 can be integrally formed. By way of example only, the inner side surface of each side frame 32 can be connected to or in contact with the outer side surface of the corresponding end of the bottom frame 33. The bottom side surface of each side frame 32 can also be connected to or in contact with the top surface of the corresponding end of the bottom frame 33.

[0044] According to the above structure, the gaps between the two ends of the bottom frame 33 and the two side frames 32 can be effectively eliminated, preventing the glue at the bottom of the box from entering the inner space through the gap between the bottom frame 33 and the side frames 32. This prevents the rigid structure formed after the battery and glue have cured from making hard contact, thereby avoiding local stress concentration caused by the hard contact between the battery and the rigid structure during cyclic expansion, and improving the service life and safety performance of the battery 10.

[0045] In another embodiment, reference Figure 7 The battery 10 comprises multiple frames, including a top frame 31, a bottom frame 33, and two side frames 32. The top frame 31 and bottom frame 33 are spaced apart along the height direction of the battery 10 and perpendicular to that direction. The top frame 31 is higher than the bottom frame 33, meaning it is located on the side of the bottom frame 33 furthest from the bottom plate of the casing. The two side frames 32 are spaced apart along the width direction of the battery 10 and perpendicular to that direction. The top frame 31 comprises multiple spaced-apart frame segments 311, with a gas channel 40 formed between any two adjacent segments 311.

[0046] According to the above structure, the gas in the inner space can be discharged through the gas channel 40 formed between any two adjacent end frames 311, effectively avoiding excessive pressure in the inner space caused by gas accumulation, thereby ensuring the buffer frame 30's buffering and supporting effect on the battery 10. Furthermore, since the gas channel 40 is located at the top frame 31, this prevents adhesive from the bottom of the casing from entering the inner space through the gas channel 40, thus preventing localized stress concentration caused by hard contact between the battery 10 and the cured adhesive, ensuring the battery 10's lifespan and safety.

[0047] Further, refer to Figure 7 The top frame 31 may comprise n segments 311 spaced apart from each other. The lengths of the n segments 311 may be the same or different. The lengths of the segments 311 may be a1 to an, in mm, and the sum of the lengths of the segments 311 is Ls, in mm, where Ls = a1 + a2 + a3 + ... + an. The distance between the two side frames 32 is D3, in mm, where 0.034 ≤ Ls / D3 ≤ 0.99, and / or 40 mm ≤ Ls ≤ 1150 mm, and / or 100 mm ≤ D3 ≤ 1190 mm. Preferably, 0.1 ≤ Ls / D3 ≤ 0.89. More preferably, 0.3 ≤ Ls / D3 ≤ 0.6. Alternatively, the ratio Ls / D3 may also be 0.05, 0.2, 0.4, 0.5, 0.65, 0.7, 0.8, or 0.9.

[0048] Within a reasonable range of 0.034 ≤ Ls / D3 ≤ 0.99, the top frame 31 can effectively buffer and support the battery 10, and also ensure that the gas in the inner space can be discharged in a timely and rapid manner through the gas channel 40. If the ratio Ls / D3 is too small, that is, the sum of the lengths of the multiple frame segments 311, Ls, is relatively small, then the gas channel 40 formed between any two adjacent frame segments 311 will be too large. This will make the overall structural strength of the top frame 31 relatively small. When the battery 10 expands or is subjected to external impacts such as vibration, the top frame 31 cannot effectively absorb the stress generated by the battery expansion, nor can it effectively and fully disperse the external impact force, resulting in local stress concentration in the battery, which in turn affects the service life and safety performance of the battery 10. If the ratio Ls / D3 is too large, that is, the sum of the lengths of the multiple frame segments 311, Ls, is relatively large, then the gas channel 40 formed between any two adjacent frame segments 311 will be too small. This leads to increased flow resistance and reduced exhaust efficiency, preventing the gas in the inner space from being discharged in a timely and rapid manner, which in turn results in excessive pressure in the inner space.

[0049] In another embodiment, reference Figure 7The battery 10 comprises multiple frames, including a top frame 31, a bottom frame 33, and two side frames 32. The top frame 31 and the bottom frame 33 are arranged at intervals along the height direction of the battery 10 and are perpendicular to the height direction, with the top frame 31 being higher than the bottom frame 33. The two side frames 32 are arranged at intervals along the width direction of the battery and are perpendicular to the width direction. Each side frame 32 includes multiple frame segments 321 spaced apart from each other, with a gas channel 40 formed between any two adjacent frame segments 321.

[0050] According to the above structure, the gas in the inner space can be discharged through the gas channel 40 formed between any two adjacent frame sections 321 on the side frame 32, which effectively avoids excessive pressure in the inner space caused by the accumulation of gas in the inner space, thereby ensuring the buffer frame 30's buffering and supporting effect on the battery 10.

[0051] Further, refer to Figure 7 Each side frame 32 may include n segments 321 spaced apart from each other. The lengths of the n segments 321 may be the same or different. The lengths of the segments 321 may be b1 to bn, in mm, and the sum of the lengths of the segments 321 is Ls, in mm, where Ls = b1 + b2 + ... + bn. The distance between two side frames 32 is D3, in mm, where 0.034 ≤ Ls / D3 ≤ 2.96, and / or 40 mm ≤ Ls ≤ 296 mm, and / or 100 mm ≤ D3 ≤ 1190 mm. Preferably, 0.2 ≤ Ls / D3 ≤ 2.56. More preferably, 1.2 ≤ Ls / D3 ≤ 1.9. Alternatively, the ratio Ls / D3 may also be 0.1, 0.4, 0.6, 0.8, 1, 1.4, 1.6, or 2.2.

[0052] If the ratio Ls / D3 is too small, meaning the sum of the lengths of the multiple frame segments 321, Ls, is relatively small, then the gas channel 40 formed between any two adjacent frame segments 321 will be too large. This will result in relatively low overall structural strength of the side frame 32. When the battery 10 expands or is subjected to external impacts such as vibration, the side frame 32 will not be able to effectively absorb the stress generated by the battery expansion, nor will it be able to effectively and sufficiently disperse the external impact force, leading to local stress concentration in the battery, which in turn affects the battery's service life and safety performance. If the ratio Ls / D3 is too large, meaning the sum of the lengths of the multiple frame segments 321, Ls, is relatively large, then the gas channel 40 formed between any two adjacent frame segments 321 will be too small. This will lead to increased flow resistance and reduced exhaust efficiency, preventing the gas in the inner space from being discharged in a timely and rapid manner, and still resulting in excessive pressure in the inner space. Therefore, within the reasonable range of 0.034≤Ls / D3≤2.96, it can be ensured that the side frame 32 provides effective buffering and support for the battery 10, and also ensure that the gas in the inner space can be discharged in a timely and rapid manner through the gas channel.

[0053] refer to Figure 7 In the height direction, the distance from the top frame 31 to the bottom frame 33 is D1, in mm, and the distance from the bottom frame 33 to the nearest gas channel 40 is D4, in mm. 0.0035 ≤ D4 / D1 ≤ 0.99, and / or 60 mm ≤ D1 ≤ 290 mm, and / or 1 mm ≤ D4 ≤ 150 mm. Preferably, 0.005 ≤ D4 / D1 ≤ 0.7. More preferably, 0.02 ≤ D4 / D1 ≤ 0.4. Alternatively, the ratio D4 / D1 can also be 0.01, 0.04, 0.008, 0.06, 0.09, 0.2, or 0.6.

[0054] If the ratio D4 / D1 is too small, meaning the distance D4 from the bottom frame 33 to the nearest gas channel 40 is relatively small, the adhesive at the bottom of the casing can easily enter the inner space through the gas channel 40. When the battery 10 expands, it will come into hard contact with 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 lifespan and safety of the battery pack 100. If the ratio D4 / D1 is too large, meaning the distance D4 from the bottom frame 33 to the nearest gas channel 40 is relatively large, the gas channels 40 on the side frame 32 will be too concentrated at the end of the side frame 32 near the top frame 31. This will result in an excessively long exhaust path for the gas in the area near the bottom frame 33 in the inner space, preventing the gas in the area near the bottom frame 33 from being discharged through the gas channel 40 in a timely manner. Therefore, within the reasonable range of 0.0035≤D4 / D1≤0.99, it is possible to effectively prevent glue from entering the inner space through the gas channel 40 and affecting the performance of the battery 10, and also to ensure that the gas in the inner space is discharged through the gas channel 40 at a more even time.

[0055] refer to Figure 8 In some embodiments, the gas channel 40 is zigzag-shaped. In other embodiments, the gas channel 40 is curved. In still other embodiments, the gas channel 40 has other shapes, and this disclosure does not limit its shape.

[0056] By making the gas channel 40 zigzag or curved, it is difficult for external foreign objects such as debris and dust to enter the inner space along a straight path, thus effectively blocking them from entering the inner space through the gas channel 40. If debris and dust do enter the inner space through the gas channel 40, contact between conductive foreign objects and the battery may cause a local short circuit. These foreign objects may also form hard contact points on the battery surface, causing local stress concentration when the battery 10 expands, thereby damaging the internal structure of the battery. In addition, the accumulation of foreign objects may also cause local overheating of the battery.

[0057] refer to Figure 2 The area of ​​the inner space projected along the thickness direction of the buffer frame 30 is S1, in mm. 2 The cross-sectional area of ​​gas channel 40 is S², in mm. 2 12 ≤ S1 / S2 ≤ 17255000, and / or 6000mm2 ≤ S1 ≤ 345100mm2, and / or 0.02 ≤ S2 ≤ 500. Preferably, 100 ≤ S1 / S2 ≤ 14000000. More alternatively, 1000 ≤ S1 / S2 ≤ 9000000. Additionally, the ratio S1 / S2 may also be 40, 600, 1500, 6200, 10000, 70000, 20000, 80000, 400000, or 3000000.

[0058] If the ratio S1 / S2 is too small, meaning the cross-sectional area S2 of the gas channel 40 is relatively large, foreign objects such as debris and dust can easily enter the inner space through the gas channel 40. Contact between these foreign objects and the battery 10 may cause a localized short circuit and hinder battery heat dissipation. Contact with the battery may also generate mechanical stress, causing localized stress concentration on the battery surface and damaging the internal structure. Furthermore, it will reduce the buffering and supporting effect of the buffer frame 30 on the battery 10. If the ratio S1 / S2 is too large, meaning the cross-sectional area S2 of the gas channel 40 is relatively small, it will lead to increased flow resistance and reduced drainage efficiency. This will prevent the gas in the inner space from being discharged in a timely and rapid manner, causing gas accumulation in the inner space and resulting in excessive pressure. Therefore, within the reasonable range of 12≤S1 / S2≤17255000, it can effectively prevent foreign objects such as debris and dust from entering the inner space through the gas channel 40, ensuring the buffer frame 30's buffering and supporting effect on the battery 10, and also allowing the gas in the inner space to be discharged in a timely and rapid manner through the gas channel 40.

[0059] In another embodiment, under a pressure of 1 MPa along the thickness direction, the compression ratio of the buffer frame 30 is C, where 3% ≤ C ≤ 90%. By way of example only, the material of the buffer frame 30 can be solid silicone, foamed silicone, microporous foamed polypropylene, foamed polyimide, ceramic fiber mat, glass fiber mat, resin, ceramic fiber aerogel, pre-oxidized fiber aerogel, glass fiber aerogel, etc.

[0060] Based on the above structure, if the compression ratio of the buffer frame 30 is too large, the deformation of the buffer frame 30 will be too large when it is compressed, causing the gas channel 40 to be blocked and closed, thus preventing the gas in the inner space from being effectively discharged. If the compression ratio of the buffer frame 30 is too small, the buffer frame 30 cannot effectively absorb and disperse the expansion force generated by the battery during charging and discharging, nor can it adequately buffer external impact forces. This will lead to local stress concentration in the battery, causing 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. Therefore, within the reasonable range of 3%≤C≤90%, the closure of the gas channel 40 due to large deformation of the buffer frame 30 under pressure can be effectively prevented, ensuring the reliability of the gas channel 40, so that the gas in the inner space can be effectively discharged through the gas channel 40. In addition, it can also ensure the buffering and supporting effect of the buffer frame 30 on the battery 10.

[0061] <Example Electrical Equipment> This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0062] 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.

[0063] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0064] In a non-restrictive example, refer to Figure 9 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 container has an internal space. Multiple batteries are disposed within the space inside the box; as well as Multiple buffer frames are respectively located between two adjacent batteries, among which, Each buffer frame includes multiple frames, which together with the two opposite faces of the two adjacent batteries form an inner space. The multiple frames include two adjacent frames, which are arranged at intervals to form a gas channel connecting the inner space with the outer space of the buffer frame.

2. The battery pack according to claim 1, characterized in that, The plurality of frames include a top frame, a bottom frame, and two side frames. The top frame and the bottom frame are arranged at intervals along the height direction of the battery and are perpendicular to the height direction. The top frame is higher than the bottom frame. The two side frames are arranged at intervals along the width direction of the battery and are perpendicular to the width direction. A gas channel is formed between one side frame and the top frame.

3. The battery pack according to claim 2, characterized in that, The gas channel is formed between each side frame and the top frame.

4. The battery pack according to claim 3, characterized in that, In the width direction of the battery, each end of the top frame protrudes beyond the corresponding side frame and faces the inner side of the inner space.

5. The battery pack according to claim 4, characterized in that, In the width direction of the battery, each end of the top frame protrudes beyond the outer side of the corresponding side frame opposite its inner side, away from the inner space.

6. The battery pack according to claim 3 or 4, characterized in that, The distance from the top frame to the bottom frame is D1, in mm, and the distance from the top of the side frame to the bottom frame is D2, in mm. 0.0345≤D2 / D1≤0.99, and / or 60mm≤D1≤290mm, and / or 10mm≤D2≤289mm.

7. The battery pack according to claim 3, characterized in that, In the width direction, the inner side surface of each side frame is located outside the corresponding end of the top frame and is spaced apart from the end.

8. The battery pack according to claim 7, characterized in that, In the height direction, the top of each side frame is lower than and spaced apart from the bottom side of the top frame.

9. The battery pack according to claim 7 or 8, characterized in that, The distance between the two side frames is D3 in mm, and the length of the top frame is L in mm. 1.002≤D3 / L≤23.8, and / or 100mm≤D3≤1190mm, and / or 50mm≤L≤1180mm.

10. The battery pack according to claim 2 or 3, characterized in that, The two ends of the bottom frame are respectively connected to or in contact with the two side frames.

11. The battery pack according to claim 1, characterized in that, The plurality of frames include a top frame, a bottom frame, and two side frames. The top frame and the bottom frame are arranged at intervals along the height direction of the battery and are perpendicular to the height direction. The top frame is higher than the bottom frame. The two side frames are arranged at intervals along the width direction of the battery and are perpendicular to the width direction. The top frame includes multiple frame segments spaced apart from each other, and the gas channel is formed between any two adjacent frame segments.

12. The battery pack according to claim 11, characterized in that, The sum of the lengths of the multiple frame segments is Ls, in mm. The distance between the two side frames is D3, in mm. 0.034≤Ls / D3≤0.99, and / or 40mm≤Ls≤1150mm, and / or 100mm≤D3≤1190mm.

13. The battery pack according to claim 1, characterized in that, The plurality of frames include a top frame, a bottom frame, and two side frames. The top frame and the bottom frame are arranged at intervals along the height direction of the battery and are perpendicular to the height direction. The top frame is higher than the bottom frame. The two side frames are arranged at intervals along the width direction of the battery and are perpendicular to the width direction. Each side frame includes multiple frame segments spaced apart from each other, and the gas channel is formed between any two adjacent frame segments.

14. The battery pack according to claim 13, characterized in that, The sum of the lengths of the multiple frame segments is Ls, in mm. The distance between the two side frames is D3, in mm. 0.034≤Ls / D3≤2.96, and / or 40mm≤Ls≤296mm, and / or 100mm≤D3≤1190mm.

15. The battery pack according to claim 13, characterized in that, In the height direction, the distance from the top frame to the bottom frame is D1, in mm, and the distance from the bottom frame to the nearest gas channel is D4, in mm, where 0.0035≤D4 / D1≤0.99, and / or 60mm≤D1≤290mm, and / or 1mm≤D4≤150mm.

16. The battery pack according to claim 1, characterized in that, The gas channel is zigzag or curved.

17. The battery pack according to claim 1, characterized in that, The area of ​​the inner space projected along the thickness direction of the buffer frame is S1, in mm. 2 The cross-sectional area of ​​the gas channel is S2, in mm. 2 12≤S1 / S2≤17255000, and / or 6000mm 2 ≤S1≤345100mm 2 And / or, 0.02≤S2≤z30500.

18. The battery pack according to claim 17, characterized in that, Under a pressure of 1 MPa along the thickness direction, the compression ratio of the buffer frame is C, where 3% ≤ C ≤ 90%.

19. The battery pack according to claim 18, characterized in that, The buffer frame is made of silicone, resin, or microporous foamed polypropylene.

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

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