Battery pack and electric device
By designing the main body and support sections of the bracket, and incorporating a buffer layer, the problem of individual battery damage during collisions at the bottom of the battery box is solved, improving the structural strength and safety of the battery pack and protecting passenger safety.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-02
AI Technical Summary
The bottom of the existing battery box is prone to contact with individual cells during a collision, which can damage the individual cells and affect the safety of the electrical device.
The design employs a main body and a support section. The main body is supported between the top cover and the bottom plate, while the support section is connected to the individual battery cells through a buffer layer. The buffer layer reduces the impact force, and the support section withstands more impact force, preventing the bottom plate of the enclosure from being broken.
It reduces the probability of individual battery cells being damaged by collisions, improves the structural strength and safety of the battery pack, and enhances passenger protection.
Smart Images
Figure CN2025104044_02072026_PF_FP_ABST
Abstract
Description
Battery packs and electrical devices
[0001] Cross-references to related applications
[0002] This disclosure claims priority to Chinese Patent Application No. 202421574856.5, entitled "Battery Pack and Power Supply Device", filed on July 4, 2024, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of battery-related technology, specifically to a battery pack and an electrical device. Background Technology
[0004] In recent years, the emergence of new energy vehicles has played a significant role in promoting social development and environmental protection. Power batteries, as rechargeable batteries, are the power source for new energy vehicles and are widely used in this field. However, in some situations, existing batteries have poor rigidity and cannot directly withstand the loads from other parts of the electrical device, which can easily lead to safety accidents and affect the safety of the electrical device.
[0005] For example, existing battery packs typically include a housing to form a containment space, within which individual cells are housed. When the bottom of the housing collides with an obstacle, the resulting force causes deformation of the bottom of the battery housing. This upward deformation can impact or compress the individual cells. Consequently, when the battery housing deforms due to an impact from below, it comes into contact with the individual cells, causing damage and potentially leading to battery failure, thus compromising the safety of the electrical device. Summary of the Invention
[0006] This application provides a battery pack and power supply device that can solve the problem that when the bottom of the existing battery box is hit, it will come into contact with the individual cells, causing damage to the individual cells and leading to battery failure.
[0007] To achieve the above objectives, the battery pack provided in this application has a first direction Z and a second direction X that intersect each other in pairs, and the battery pack includes:
[0008] The enclosure includes a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the two sides of the frame in the first direction to jointly define the accommodating space;
[0009] A bracket is disposed within the accommodating space. The bracket includes a main body and a support. The main body is supported between the top cover and the bottom plate and is connected to the top cover and the bottom plate respectively. The support is connected to the side of the main body facing the bottom plate and is connected to the bottom plate. The support has a first plate surface facing away from the bottom plate.
[0010] A buffer layer is disposed within the accommodating space and connected to the first plate surface;
[0011] A single battery cell is disposed within the receiving space. The single battery cell includes a housing having a first side facing the bottom plate, the first side being connected to the side of the buffer layer facing the top cover.
[0012] The dimension D1mm of the main body in the second direction is smaller than the dimension D2mm of the support in the second direction.
[0013] In this technical solution, the main body of the bracket is supported between the top cover and the bottom plate and connected to both respectively. The support portion of the bracket is connected to the first side of the individual battery cell through a buffer layer. This allows the impact force to be transferred partly to the top cover and partly to the buffer layer when the bottom plate collides with an obstacle and deforms. The buffer layer reduces the impact force transmitted to the individual battery cell. This impact force handling scheme reduces the probability of damage to the individual battery cell from collision with the bottom plate, thus preventing battery failure. Furthermore, the dimension D1mm of the main body of the bracket in the second direction is smaller than the dimension D2mm of the support portion of the bracket in the second direction X, allowing the buffer layer to withstand more impact force and preventing the bottom plate of the battery pack from being broken due to excessive impact force.
[0014] In some embodiments of this application, the buffer layer is disposed on the top of the first plate surface, and the single cell is supported on the buffer layer so that the first side is spaced relative to the bottom plate.
[0015] In some embodiments of this application, the side of the main body facing away from the support is directly connected to the top cover.
[0016] In some embodiments of this application, the housing has a second side facing the top cover, and the bracket further includes a connecting portion connected to at least one side of the main body in the second direction X, the connecting portion being located between the second side and the top cover and contacting the second side.
[0017] In some embodiments of this application, in the first direction Z, there is a first gap between the first side portion and the support portion, and the buffer layer is located within the first gap.
[0018] In some embodiments of this application, the dimension H1mm of the first gap in the first direction Z satisfies: 0.2≤H1≤10.
[0019] In some embodiments of this application, a second gap is provided between the base plate and the first side portion in the first direction Z. The second gap has a size of H2mm in the first direction Z and satisfies: 3≤H2≤35 and H2>H1.
[0020] In some embodiments of this application, the size of the main body portion in the second direction X is D1mm, and satisfies: 0.5≤D1≤30.
[0021] In some embodiments of this application, a pole post is provided on the first side, and the pole post is located on one side of the support portion, so that the pole post is offset from the buffer layer and the support portion in the second direction X.
[0022] In some embodiments of this application, in the first direction Z, the size of the buffer layer is larger than the size of the pole protruding from the first side.
[0023] In some embodiments of this application, the battery pack further has a third direction Y, wherein the first direction Z, the second direction X, and the third direction Y are mutually perpendicular;
[0024] The housing includes two sidewalls 213 extending along the third direction Y and arranged opposite to each other. Two pole posts are provided on the first side. In the second direction X, the dimension of the portion of the support that supports the buffer layer is D2mm. The dimension between the two sidewalls and the pole posts adjacent to them is D3mm, and satisfies: D2=(0.25~1)D3.
[0025] In some embodiments of this application, the size of the single cell is L mm in the second direction X, and the size of the connecting portion in the second direction X is D4 mm, satisfying: 0 < D4 ≤ L / 2.
[0026] In some embodiments of this application, there are multiple brackets, which are arranged sequentially along the second direction X. The individual battery is disposed between two adjacent brackets and supported by a buffer layer of the two adjacent brackets.
[0027] In some embodiments of this application, there are multiple brackets, which are arranged sequentially along the second direction X. The individual battery is disposed between two adjacent brackets, and at least one bracket simultaneously supports two adjacent individual batteries in the second direction X.
[0028] In some embodiments of the present application, the battery pack further has a third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other pairwise. A plurality of the single cells are arranged along the third direction Y, and at least one of the brackets supports a plurality of the single cells arranged along the third direction.
[0029] In some embodiments of the present application, there are a plurality of the brackets, and the plurality of brackets are sequentially and spacedly arranged in the accommodation space;
[0030] The two brackets at both ends are in an "L" shape, and the support portion is provided on one side of the main body portion;
[0031] The brackets in the middle are in an inverted "T" shape, and the support portions are provided on both sides of the main body portion;
[0032] There are a plurality of the buffer layers, and the plurality of buffer layers are provided corresponding to the support portions one by one;
[0033] The single cell is arranged between two adjacent brackets, and both ends of the single cell are respectively supported by the buffer layers of two adjacent brackets.
[0034] In some embodiments of the present application, there are a plurality of the brackets, and the plurality of brackets are sequentially and spacedly arranged in the accommodation space;
[0035] The two brackets at both ends are in a "匚" shape, and the support portion and the connecting portion are provided on the same side of the main body portion;
[0036] The brackets in the middle are in an "I" shape, and the support portions and the connecting portions are provided on both sides of the main body portion;
[0037] There are a plurality of the buffer layers, and the plurality of buffer layers are provided corresponding to the support portions one by one;
[0038] The single cell is arranged between two adjacent brackets, and both ends of the single cell are respectively supported by the buffer layers of two adjacent brackets.
[0039] In some embodiments of the present application, the battery pack further includes:
[0040] A cooling component, which is arranged on one side of the top cover facing the bottom plate and / or on one side of the main body portion facing the single cell.
[0041] In some embodiments of the present application, the buffer layer includes at least one of silica gel foam, silica gel sheet, and structural adhesive.
[0042] On the other hand, the present application further provides an electrical device, including the battery pack according to any one of the above technical solutions.
[0043] Since the power supply device provided in this application includes the battery pack described in any of the above technical solutions, both can solve the same problem and achieve the same effect. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1 is a perspective view of a battery pack according to an embodiment of this application;
[0046] Figure 2 is an exploded view of a battery pack according to an embodiment of this application;
[0047] Figure 3 is a cross-sectional view of a battery pack according to an embodiment of this application;
[0048] Figure 4 is a schematic diagram of the structure of the bracket in the battery pack according to an embodiment of this application;
[0049] Figure 5 is a schematic diagram of the battery pack structure in another embodiment of this application;
[0050] Figure 6 is a schematic diagram of the structure of the bracket in the battery pack in another embodiment of this application;
[0051] Figure 7 is an enlarged view of part A in Figure 3;
[0052] Figure 8 is an enlarged view of part B in Figure 5;
[0053] Figure 9 is a schematic diagram of the structure of a single battery cell in the battery pack in an embodiment of this application;
[0054] Figure 10 is a schematic diagram of the cooling component in the battery pack in an embodiment of this application.
[0055] Icons: 10 - Housing; 11 - Top cover; 12 - Frame; 13 - Bottom plate; 120 - Accommodation space; 20 - Individual battery; 21 - Housing; 211 - First side; 212 - Second side; 213 - Side wall; 22 - Terminal post; 23 - Cover plate; 24 - Explosion-proof valve; 30 - Bracket; 31 - Main body; 32 - Support; 321 - First plate; 33 - Connecting part; 40 - Buffer layer; 50 - Cooling assembly; 51 - Liquid cooling plate; 52 - Channel; 20a - First gap; 20b - Second gap. Detailed Implementation
[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0057] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0058] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0060] This application provides a battery pack and an electrical device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.
[0061] Figure 1 is a perspective view of the battery pack in an embodiment of this application, Figure 2 is an exploded view of the battery pack in an embodiment of this application, and Figure 3 is a cross-sectional view of the battery pack in an embodiment of this application. Referring to Figures 1 to 3, the battery pack provided in this application has a first direction Z and a second direction X that intersect each other. The battery pack includes a housing 10, a support 30, a buffer layer 40, and individual batteries 20. The housing 10 includes a top cover 11, a frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to both sides of the frame 12 in the first direction Z to jointly define an accommodating space 120. The support 30 is disposed in the accommodating space 120. The support 30 includes a main body 31 and a supporting part 32. The main body 31 is supported between the top cover 11 and the bottom plate 13 and is connected to the top cover 11 and the bottom plate 13 respectively. The supporting part 32 is connected to the side of the main body 31 facing the bottom plate 13 and is connected to the bottom plate 13. The supporting part 32 has a first plate surface 321 facing away from the bottom plate 13. A buffer layer 40 is disposed within the receiving space 120 and connected to the first plate surface 321. A single battery cell 20 is disposed within the receiving space 120 and includes a housing 21. The housing 21 has a first side portion 211 facing the bottom plate 13, and the first side portion 211 is connected to the side of the buffer layer 40 facing the top cover 11. The main body portion 31 has a dimension D1mm in the second direction X that is smaller than the support portion 32 has a dimension D2mm in the second direction X.
[0062] In this technical solution, the main body 31 of the bracket 30 is supported between the top cover 11 and the bottom plate 13 and is connected to both the top cover 11 and the bottom plate 13 respectively. The support part 32 of the bracket 30 is connected to the first side 211 of the single battery 20 through the buffer layer 40. When the bottom plate 13 collides with an obstacle and deforms, part of the impact force is transmitted to the top cover 11 through the main body 31, and the other part is transmitted to the buffer layer 40 through the support part 32. The buffer layer 40 can reduce the impact force transmitted to the single battery 20. Through the above-mentioned impact force handling scheme, the probability of the single battery 20 colliding with the bottom plate 13 and being damaged, thereby leading to battery failure, can be reduced. Furthermore, the dimension D1mm of the main body 31 in the second direction X is smaller than the dimension D2mm of the support part 32 in the second direction X, so that the buffer layer 40 can withstand more impact force and prevent the bottom plate 13 of the battery pack housing 10 from being broken due to excessive impact force.
[0063] Specifically, the bottom of the frame 12 has an opening, and the base plate 13 covers the opening. The connection between the base plate 13 and the frame 12 can be a threaded connection, a snap-fit connection, or welding; this application does not impose any specific limitation on this. Similarly, the connection between the bracket 30 and the base plate 13 can be welding, bonding, a snap-fit connection, or a threaded connection; this application does not impose any specific limitation on this.
[0064] Referring again to Figure 3, the single battery 20 also includes a terminal post 22, which is disposed on the first side portion 211. The first side portion 211 is supported on the buffer layer 40. In other words, in the first direction Z, there is a first gap 20a between the first side portion 211 of the single battery 20 and the support portion 32 of the bracket 30, and the buffer layer 40 is located within the first gap 20a, as shown in Figure 7. That is, the terminal post 22 protrudes downward from the lower surface of the housing 21, the lower surface of the housing 21 faces the upper surface of the bottom plate 13, and the buffer layer 40 is disposed between the lower surface of the housing 21 and the bottom plate 13. In this embodiment, the single battery 20 is installed upside down inside the housing 10, which can enhance the overall rigidity of the battery pack and reduce the probability of battery pack damage. Furthermore, since the terminal post 22 faces the lower top cover 11, and the passenger is closer to the top cover 11 than the bottom plate 13, this arrangement can maximize passenger safety in the event of thermal runaway of the single battery 20.
[0065] It should be noted that the first side portion 211 is supported by the buffer layer 40, meaning that the projection area of the electrode post 22 on the base plate 13 is offset from the projection area of the buffer layer 40 on the base plate 13, which helps to improve the energy density of the battery pack. Specifically, in the first direction Z, the size of the buffer layer 40 is larger than the size of the electrode post 22 protruding from the first side portion 211. That is, there is a gap between the electrode post 22 and the base plate 13 in the first direction Z, and the two do not contact each other.
[0066] In some embodiments, as shown in Figures 3 and 4, the side of the main body 31 facing away from the support 32 is directly connected to the top cover 11, that is, the bracket 30 is inverted "T" shape, with its two ends contacting and connecting to the top cover 11 and the bottom plate 13 respectively. The structure of the bracket 30 is simple and conducive to improving the energy density of the battery pack. It should be noted that since the brackets 30 at both ends only need to support one single battery cell 20, in order to reduce the size of the housing 10 in the second direction X, the brackets 30 at both ends in the second direction X are "L" shaped.
[0067] In other embodiments, as shown in Figures 5 and 6, the housing 21 has a second side 212 facing the top cover 11, and the bracket 30 further includes a connecting portion 33. The connecting portion 33 is connected to at least one side of the main body 31 in the second direction X, and is located between the second side 212 and the top cover 11, and contacts the second side 212 and / or the top cover 11. That is, the bracket 30 is generally "I" shaped. The connection portion 33 can increase the contact area between the bracket 30 and the top cover 11, thereby helping to enhance the overall strength of the battery. It should be noted that since the brackets 30 at both ends only need to support one single battery cell 20, in order to reduce the size of the housing 10 in the second direction X, the brackets 30 at both ends in the second direction X are "U" shaped.
[0068] The following is a detailed description of the common parts of the support 30 in the two structures described above.
[0069] Referring to Figures 7 and 8, the first gap 20a has a dimension of H1mm in the first direction Z, and satisfies: 0.2≤H1≤10, to ensure that the buffer layer 40 has a suitable thickness in the first direction Z, thereby ensuring the buffering effect of the buffer layer 40. At the same time, it can also avoid the first gap 20a having an excessively large dimension H1mm in the first direction Z, which would result in a low energy density of the battery pack.
[0070] In the first direction Z, a second gap 20b is provided between the base plate 13 and the first side 211 of the casing 21 of the single battery 20. The second gap 20b has a dimension of H2mm in the first direction Z, and satisfies: 3≤H2≤35, and H2>H1. This is to avoid the second gap 20b having an excessively large dimension H2mm in the first direction Z, which would result in an excessively large or small volume utilization rate of the battery pack, affecting battery safety. At the same time, it also prevents the second gap 20b from being too small, which would be detrimental to the installation of the bracket 30 and the buffer layer 40. It can be understood that the aforementioned support part 32 has a dimension of H3mm in the first direction Z, and satisfies: H3=H2-H1.
[0071] In the second direction X, the size of the main body 31 is D1mm, and satisfies: 0.5≤D1≤30. This ensures that the main body 31 provides good support while avoiding the problem of excessive material requirements and high manufacturing costs associated with an overly large main body 31.
[0072] In some embodiments, the battery pack further has a third direction Y, and the first direction Z, the second direction X, and the third direction Y are mutually perpendicular; the housing 21 includes two side walls 213 extending along the third direction Y and arranged opposite to each other, the first side 211 is provided with two pole posts 22, in the second direction X, the dimension of the portion of the support 32 supported on the buffer layer 40 is D2mm, the dimension between the two side walls 213 and the pole post 22 close to them is D3mm, and satisfies: D2=(0.25~1)D3, ensuring that the contact area between the buffer layer 40 and the first side 211 of the housing 21 is more suitable, which is beneficial to ensuring the buffering effect of the buffer layer 40.
[0073] The following is a detailed description of the different parts of the support 30 in the two structures described above.
[0074] As shown in Figures 5 and 6, in this embodiment, the bracket 30 includes a connecting portion 33 located on the top of the main body 31. In the second direction X, the size of the single battery 20 is L mm, and the size of the connecting portion 33 in the second direction X is D4 mm, satisfying: 0 < D4 ≤ L / 2, to ensure the contact area between the connecting portion 33 and the top plate 11, so as to better transfer the impact force received by the bottom plate 13 to the top plate 11, thereby better avoiding damage to the battery pack.
[0075] The performance of the technical solutions provided in the embodiments of this application will be evaluated below with reference to specific examples.
[0076] Embodiments 1 to 24 are provided, in which the dimensions D3 mm between the two sidewalls 213 of the housing 21 and the adjacent terminal 22, and the dimension L mm of the individual battery 20 in the second direction X are constant values. In the battery pack selected in this application, the dimensions D3 = 27 mm between the two sidewalls 213 of the housing 21 and the adjacent terminal 22, and the dimension L = 208 mm of the individual battery 20 in the second direction X.
[0077] It should be noted that the embodiments of this application characterize the overall structural strength of the battery pack through stress testing. Stress is applied to the battery pack to conduct stress tests. During the test, the maximum stress that the battery pack can withstand is detected. The maximum stress F can be detected using the mechanical impact test in GB38031-2020, with units of MPa. The greater the maximum stress that the battery pack can withstand, the higher the overall structural strength of the battery pack. The space utilization rate of the battery pack provided in the embodiments of this application is characterized by energy density T, where energy density T = battery pack capacity / battery pack weight = individual cell voltage * number of cells * cell capacity / battery pack weight, with units of Wh / kg.
[0078] Specifically, Examples 1 to 5 satisfy 0.2 ≤ H1 ≤ 10, with the remaining parameters being constants, such as H2, D1, D2, and D4. Examples 6 to 9 satisfy 3 ≤ H2 ≤ 35, with the remaining parameters being constants, such as H1, D1, D2, and D4. Examples 10 to 14 satisfy 0.5 ≤ D1 ≤ 30, with the remaining parameters being constants, such as H1, H2, D2, and D4. Examples 15 to 19 satisfy D2 = (0.25 ~ 1)D3, with the remaining parameters being constants, such as H1, H2, D1, and D4. Examples 20 to 24 satisfy 0 < D4 ≤ 0.5L, with the remaining parameters being constants, such as H1, H2, D1, and D2. Specific parameters and test results are detailed in Table 1.
[0079] In addition, comparative examples 1-4 are provided. Comparative example 1-2 is a test without a buffer layer. Comparative example 3 is a test in which the dimension of the support part 32 in the second direction X exceeds the dimension between the side wall 213 and the pole post 22 near it. Comparative example 4 is a test in which the dimension of the support part 32 in the second direction X is less than 0.25 times the dimension between the side wall 213 and the pole post 22 near it.
[0080] Table 1
[0081] As can be seen from Examples 1 to 24 and Comparative Examples 1 to 4:
[0082] (1) When the buffer layer 40 is not set, the maximum stress of the battery pack is below 9 MPa. When the buffer layer 40 is set, the maximum stress of the battery pack is above 9 MPa, which significantly improves the structural strength of the battery pack.
[0083] (2) When a buffer layer of 40 is set and D2 = (0.25~1)D3, the maximum stress of the battery pack is above 10 MPa, and the structural strength of the battery pack is relatively superior.
[0084] The structure and dimensions of the support 30 have been described in detail above. Next, the arrangement of the support 30 will be described in detail.
[0085] In some embodiments of this application, as shown in Figures 3 and 5, the battery pack further has a second direction X, with multiple supports 30 arranged sequentially along the second direction X. Individual cells 20 are disposed between two adjacent supports 30, and each individual cell 20 is supported by a buffer layer 40 between the two adjacent supports 30. That is, each individual cell 20 is supported by supports 30 at both ends of the second direction X, and the impact force transmitted to the individual cell 20 through the buffer layer 40 and the base plate 13 can be buffered. The impact force can be dispersed by the two supports 30 located on both sides of the individual cell 20, effectively reducing stress concentration and preventing damage to the individual cell 20.
[0086] This can be understood as each individual battery cell 20 being supported by two corresponding brackets 30. For example, if the battery pack includes two individual batteries 20, then four brackets 30 are needed to support the two individual batteries 20. The four brackets 30 are arranged sequentially along the second direction X. No individual batteries 20 are placed between the two middle brackets 30. There may be gaps between the two middle brackets 30, or they may be close to each other. This application does not limit this.
[0087] In some embodiments of this application, the battery pack also has a second direction X, with multiple supports 30 spaced apart along the second direction X, and individual cells 20 disposed between two adjacent supports 30. At least one support 30 simultaneously supports two adjacent individual cells 20 in the second direction X, that is, the same support 30 can simultaneously support two adjacent individual cells 20 in the second direction X, thereby reducing the number of supports 30 required in the battery pack and improving the manufacturing efficiency of the battery pack.
[0088] Based on the above embodiments, the battery pack also has a third direction Y, a first direction Z, a second direction X and a third direction Y that are mutually perpendicular to each other, and a plurality of individual cells 20 are arranged along the third direction Y. At least one bracket 30 simultaneously supports the plurality of individual cells 20 arranged along the third direction Y. That is, the same bracket 30 can simultaneously support the plurality of individual cells 20 arranged along the third direction Y, thereby further reducing the number of brackets 30 and further improving the production efficiency of the battery pack.
[0089] Meanwhile, in order to ensure the support effect of the bracket 30 and the safety performance of the battery pack with the bracket 30, the bracket 30 is made of rigid insulating material, so as to separate two adjacent single cells 20 in the second direction X.
[0090] In some embodiments of this application, the buffer layer 40 is made of a flexible or elastic material. For example, the buffer layer 40 includes at least one of silicone foam, silicone sheet, and structural adhesive.
[0091] In this embodiment, the buffer layer 40 is on the first plate surface 321 and has a shape substantially the same as the first plate surface 321.
[0092] In some embodiments of this application, referring to Figures 3 and 9, the single cell 20 further includes a cover plate 23, which is disposed facing the base plate 13, and the terminal post 22 passes through the cover plate 23. For example, an explosion-proof valve 24 is also disposed on the cover plate 23.
[0093] In some embodiments of this application, referring to FIG10, the battery pack further includes a cooling assembly 50. The cooling assembly 50 is disposed on the side of the top cover 11 facing the bottom plate 13, and / or, the cooling assembly 50 is disposed on the side of the main body 31 facing the individual battery 20, to cool the individual battery 20 and play a role in heat insulation and preventing thermal runaway. For example, the cooling assembly 50 includes a graphite heat-conducting plate and a heat spreader. Alternatively, the cooling assembly 50 includes a liquid cooling plate 51 and a channel 52 disposed on the liquid cooling plate 51. The channel 52 is used for the flow of cooling medium to remove the heat of the individual battery 20, and the two ports of the channel 52 are respectively connected to an external supply device and a storage device.
[0094] In some embodiments of this application, an electrical device is also provided, including a battery pack as described in any of the above technical solutions. Since the electrical device provided in this application includes a battery pack as described in any of the above technical solutions, both can solve the same problem and achieve the same effect.
[0095] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application. Industrial applicability
[0097] In summary, this disclosure provides a battery pack and power supply device with a simple overall structure and low cost. It can also solve the problem that when the bottom of the existing battery box is hit, it will come into contact with the individual cells, causing damage to the individual cells and leading to battery failure.
Claims
1. A battery pack, wherein, The battery pack has a first direction (Z) and a second direction (X) that intersect each other in pairs, and the battery pack includes: The box (10) includes a top cover (11), a frame (12) and a bottom plate (13), wherein the top cover (11) and the bottom plate (13) are respectively connected to the two sides of the frame (12) in the first direction (Z) to jointly define the accommodating space (120); A bracket (30) is disposed within the accommodating space (120). The bracket (30) includes a main body (31) and a support (32). The main body (31) is supported between the top cover (11) and the bottom plate (13) and is connected to the top cover (11) and the bottom plate (13) respectively. The support (32) is connected to the side of the main body (31) facing the bottom plate (13) and is connected to the bottom plate (13). The support (32) has a first plate surface (321) facing away from the bottom plate (13). A buffer layer (40) is disposed within the receiving space (120) and connected to the first plate surface (321); A single battery cell (20) is disposed within the receiving space (120). The single battery cell (20) includes a housing (21) having a first side (211) facing the bottom plate (13). The first side (211) is connected to the side of the buffer layer (40) facing the top cover (11). The dimension D1mm of the main body (31) in the second direction (X) is smaller than the dimension D2mm of the support (32) in the second direction (X).
2. The battery pack of claim 1, wherein, The buffer layer (40) is disposed on the top of the first plate (321), and the single cell (20) is supported on the buffer layer (40) so that the first side (211) is spaced relative to the bottom plate (13).
3. The battery pack according to claim 1, wherein, The side of the main body (31) facing away from the support (32) is directly connected to the top cover (11).
4. The battery pack of claim 1, wherein, The housing (21) has a second side (212) facing the top cover (11), and the bracket (30) further includes a connecting portion (33) connected to at least one side of the main body (31) in the second direction (X), the connecting portion (33) being located between the second side (212) and the top cover (11) and in contact with the second side (212).
5. The battery pack of claim 1, wherein, In the first direction (Z), there is a first gap (20a) between the first side portion (211) and the support portion (32), and the buffer layer (40) is located within the first gap (20a).
6. The battery pack of claim 5, wherein, The dimension H1mm of the first gap (20a) in the first direction (Z) satisfies: 0.2≤H1≤10.
7. The battery pack of claim 6, wherein, In the first direction (Z), there is a second gap (20b) between the base plate (13) and the first side (211), the second gap (20b) having a size of H2mm in the first direction (Z) and satisfying: 3≤H2≤35, and H2>H1.
8. The battery pack of claim 1, wherein, In the second direction (X), the size of the main body (31) is D1mm, and satisfies: 0.5≤D1≤30.
9. The battery pack of claim 1, wherein, The first side portion (211) is provided with a pole post (22), which is located on one side of the support portion (32) so that the pole post (22) is offset from the buffer layer (40) and the support portion (32) in the second direction (X).
10. The battery pack of claim 9, wherein, In the first direction (Z), the size of the buffer layer (40) is larger than the size of the pole post (22) protruding from the first side (211).
11. The battery pack of claims 9 and 10, wherein, The battery pack also has a third direction (Y), and the first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other; the housing (21) also includes two side walls (213) extending along the third direction (Y) and arranged opposite to each other. Two pole posts (22) are provided on the first side (211). In the second direction (X), the size of the part of the support (32) supported by the buffer layer (40) is D2mm. The size between the two side walls (213) and the pole post (22) close to them is D3mm, and satisfies: D2=(0.25~1)D3.
12. The battery pack of claim 4, wherein, In the second direction (X), the size of the single cell (20) is L mm, and the size of the connecting part (33) in the second direction (X) is D4 mm, satisfying: 0 < D4 ≤ L / 2.
13. The battery pack of claim 1, wherein, There are multiple brackets (30), and the multiple brackets (30) are arranged sequentially along the second direction (X). The single battery (20) is disposed between two adjacent brackets (30), and the single battery (20) is supported by the buffer layer (40) of the two adjacent brackets (30).
14. The battery pack of claim 1, wherein, There are multiple brackets (30), and the multiple brackets (30) are distributed at intervals along the second direction (X). The individual battery (20) is disposed between two adjacent brackets (30), and at least one bracket (30) simultaneously supports two adjacent individual batteries (20) in the second direction (X).
15. The battery pack of claim 1, wherein, The battery pack also has a third direction (Y), the first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other, and a plurality of individual cells (20) are arranged along the third direction (Y), and at least one bracket (30) simultaneously supports the plurality of individual cells (20) arranged along the third direction (Y).
16. The battery pack of claim 1, wherein, The bracket (30) includes a plurality of brackets, which are arranged sequentially at intervals in the accommodating space (120); The two brackets (30) located at both ends are L-shaped, and the support part (32) is provided on one side of the main body (31); The bracket (30) located in the middle is in the shape of an inverted "T", and the support part (32) is provided on both sides of the main body (31); There are multiple buffer layers (40), and each buffer layer (40) is provided in a one-to-one correspondence with the support part (32); The single cell (20) is disposed between two adjacent brackets (30), and both ends of the single cell (20) are respectively supported by the buffer layers (40) of two adjacent brackets (30).
17. The battery pack of claim 4, wherein, There are multiple brackets (30), and the multiple brackets (30) are sequentially arranged at intervals in the accommodation space (120); The two brackets (30) at both ends are in a "C" shape, and the support portion (32) and the connection portion (33) are provided on the same side of the main body portion (31); The bracket (30) in the middle is in an "I" shape, and the support portion (32) and the connection portion (33) are provided on both sides of the main body portion (31); There are multiple buffer layers (40), and the multiple buffer layers are arranged corresponding to the support portions one by one; The single cell (20) is disposed between two adjacent brackets (30), and both ends of the single cell (20) are respectively supported by the buffer layers (40) of two adjacent brackets (30).
18. The battery pack of claim 1, wherein, The battery pack further includes: A cooling component (50), which is disposed on one side of the top cover (11) facing the bottom plate (13), and / or, disposed on one side of the main body portion (31) facing the single cell (20).
19. The battery pack of claim 1, wherein, The buffer layer (40) is at least one of silica gel foam, silica gel sheet and structural adhesive.
20. An electrical device, comprising: It includes the battery pack according to any one of claims 1 to 19.