Battery pack and electric device

Abstract

The utility model relates to battery technical field discloses a kind of battery pack and electric device, and battery pack includes bottom plate, frame, protection structure and liquid cooling structure;Protection structure includes elastic buffer plate and reinforcing plate, and the hardness of reinforcing plate is greater than the hardness of elastic buffer plate;Elastic buffer plate is connected with bottom plate;Liquid cooling structure includes liquid cooling plate and water nozzle, and liquid cooling plate is connected on the side of elastic buffer plate away from bottom plate, and water nozzle is located on the side of liquid cooling plate away from elastic buffer plate and is welded with liquid cooling plate to form weld joint;Elastic buffer plate is located between liquid cooling plate and bottom plate, reinforcing plate is located between liquid cooling plate and bottom plate, and weld joint is correspondingly arranged with reinforcing plate;The orthographic projection of weld joint on bottom plate is located within the orthographic projection of reinforcing plate on bottom plate;Battery pack is correspondingly arranged with reinforcing plate through weld joint, and the orthographic projection of weld joint on bottom plate is located within the orthographic projection of reinforcing plate on bottom plate, reduce weld joint cracking risk, improve the security of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] In existing battery packs, the bottom protection structure mainly consists of a base plate and an elastic buffer layer. In recent years, with the industry's increasing requirements for bottom protection of power batteries, bottom ball impact testing has become a widely adopted testing method in the industry. During the bottom ball impact test, the weld seam at the welding position of the water nozzle and the liquid cooling plate is prone to cracking. The cracking of the weld seam will cause the sealing performance of the liquid cooling plate to fail and generate the risk of liquid leakage, which seriously affects the safety of the power battery pack. Utility Model Content

[0003] With the aim of at least solving one of the technical problems existing in the prior art, this utility model aims to provide a battery pack and an electrical device having the battery pack, wherein the battery pack can reduce the risk of weld cracking and improve safety.

[0004] To achieve the above objectives, this utility model provides a battery pack having a first direction, including a base plate, a frame, a protective structure, and a liquid cooling structure; the frame is connected to the base plate and encloses the base plate to form an accommodating cavity; the protective structure includes an elastic buffer plate and a reinforcing plate, the reinforcing plate having a harder hardness than the elastic buffer plate; the elastic buffer plate is disposed within the accommodating cavity and connected to the base plate; the liquid cooling structure is disposed within the accommodating cavity, the liquid cooling structure including a liquid cooling plate and a water nozzle, the liquid cooling plate being connected to the side of the elastic buffer plate opposite to the base plate, the water nozzle being located on the side of the liquid cooling plate opposite to the elastic buffer plate and welded to the liquid cooling plate to form a weld; along the first direction, the elastic buffer plate is located between the liquid cooling plate and the base plate, the reinforcing plate is located between the liquid cooling plate and the base plate, and the weld is correspondingly disposed with the reinforcing plate; wherein, along the first direction, the orthographic projection of the weld on the base plate is within the range of the orthographic projection of the reinforcing plate on the base plate.

[0005] In some embodiments, the elastic buffer plate is provided with a mounting hole extending along the first direction, and the reinforcing plate is disposed within the mounting hole.

[0006] In some embodiments, the protective structure further includes an elastic buffer pad disposed within the mounting hole, and along the first direction, the elastic buffer pad is disposed between the base plate and the reinforcing plate; the elastic buffer pad is connected to the side of the reinforcing plate opposite to the liquid cooling plate; and / or, the elastic buffer pad is connected to the base plate.

[0007] In some embodiments, the protective structure further includes an elastic buffer pad, which is at least partially disposed within the mounting hole and between the liquid cooling plate and the reinforcing plate along the first direction; the elastic buffer pad is connected to the side of the reinforcing plate opposite to the base plate, and / or the reinforcing plate is connected to the base plate.

[0008] In some embodiments, the side of the reinforcing plate opposite to the elastic buffer pad is connected to the liquid cooling plate, and the side of the elastic buffer pad opposite to the reinforcing plate is in contact with the base plate.

[0009] In some embodiments, along the first direction, the thickness of the elastic buffer plate is a mm, the thickness of the reinforcing plate is b mm, and the thickness of the elastic buffer pad is c mm, satisfying: b + c ≤ a.

[0010] In some embodiments, at least one of the reinforcing plate and the elastic cushioning pad is connected to the elastic cushioning plate.

[0011] In some embodiments, the mounting hole has a main hole portion and a positioning hole portion that communicate with each other; the reinforcing plate includes a plate body and a positioning portion, the plate body is located in the main hole portion, and the positioning portion is connected to the plate body and located in the positioning hole portion.

[0012] In some embodiments, the elastic buffer plate has a receiving groove on the side facing the liquid cooling plate, the reinforcing plate is housed in the receiving groove, and the receiving groove has a bottom wall; along the first direction, the reinforcing plate is located between the liquid cooling plate and the bottom wall of the groove.

[0013] This utility model also provides an electrical device, which includes a battery pack according to any one of the above claims.

[0014] Compared with the prior art, the battery pack provided in this embodiment of the present invention has the following advantages: (1) By placing the elastic buffer plate between the bottom plate and the liquid cooling plate, when the bottom plate is impacted from the bottom, the impact force is first transmitted to the elastic buffer plate and then to the liquid cooling plate. During this process, the elastic buffer plate can absorb energy and buffer the impact force to reduce the impact force transmitted from the bottom plate to the liquid cooling plate, thereby enabling the elastic buffer plate to protect the liquid cooling plate from damage and improve the safety performance of the battery pack.

[0015] (2) By placing the reinforcing plate between the base plate and the liquid cooling plate, when the base plate is impacted from the bottom, the impact force is first transmitted to the reinforcing plate and then to the liquid cooling plate. Since the weld is correspondingly set with the reinforcing plate and the orthographic projection of the weld on the base plate is within the range of the orthographic projection of the reinforcing plate on the base plate, the external impact force is first transmitted to the reinforcing plate and then to the weld of the water nozzle and the liquid cooling plate. Since the hardness of the reinforcing plate is greater than that of the elastic buffer plate, when the reinforcing plate is impacted from the bottom, the reinforcing plate is less likely to deform than the elastic buffer plate, so as to effectively withstand and disperse the impact force. Thus, the reinforcing plate can provide key protection for the weld of the water nozzle and the liquid cooling plate, effectively reduce the impact force that can be transmitted to the weld of the water nozzle and the liquid cooling plate, reduce the risk of weld cracking, and improve the safety of the battery pack. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a battery pack provided in Embodiment 1 of this utility model; Figure 2 This is a cross-sectional view of a battery pack provided in Embodiment 1 of this utility model; Figure 3 yes Figure 2 Enlarged view of point A; Figure 4 yes Figure 2 Enlarged view of point B; Figure 5 This is a schematic diagram of the battery pack structure after omitting the cover plate according to Embodiment 1 of this utility model; Figure 6 This is an exploded view of the battery pack provided in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram showing the connection of the base plate, frame, and separator provided in Embodiment 1 of this utility model; Figure 8 This is an assembly diagram of the elastic buffer plate and reinforcing plate provided in Embodiment 1 of this utility model; Figure 9 This is a top view of the elastic buffer plate provided in Embodiment 1 of this utility model; Figure 10 This is a top view of the reinforcing plate provided in Embodiment 1 of this utility model; Figure 11 This is a cross-sectional view of a battery pack provided in Embodiment 2 of this utility model; Figure 12 yes Figure 11 Enlarged view of point C; Figure 13 This is a cross-sectional view of a battery pack provided in Embodiment 3 of this utility model; Figure 14 yes Figure 13Enlarged diagram of point D. Figure 15 This is a cross-sectional view of a battery pack provided in Embodiment 4 of this utility model; Figure 16 yes Figure 15 Enlarged view of point E; Figure 17 yes Figure 16 A schematic diagram omitting the reinforcing plate;

[0017] In the diagram, 1. Base plate; 2. Border; 20. Receiving cavity; 3. Protective structure; 31. Elastic buffer plate; 32. Reinforcing plate; 33. Elastic buffer pad; 311. Buffer sub-plate; 321. Plate body; 322. Positioning part; 3111. Mounting hole; 3112. Receiving groove; 31111. Main hole part; 31112. Positioning hole part; 31121. Groove bottom wall; 4. Liquid cooling structure; 41. Liquid cooling plate; 42. Water tap; 401. Weld; 5. Battery; 6. Divider; 61. First dividing beam; 62. Second dividing beam; 63. Third dividing beam; 7. Cover plate; Z, first direction; X, second direction; Y, third direction. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 utility model.

[0020] 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.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0024] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0025] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Example 1 like Figures 1 to 10As shown, the battery pack provided in Embodiment 1 of this utility model has a first direction Z, a second direction X and a third direction Y that are perpendicular to each other. The battery pack includes a base plate 1, a frame 2, a protective structure 3 and a liquid cooling structure 4.

[0027] The frame 2 is connected to the base plate 1 and encloses the base plate 1 to form a receiving cavity 20; the protective structure 3 includes an elastic buffer plate 31 and a reinforcing plate 32, the hardness of the reinforcing plate 32 is greater than the hardness of the elastic buffer plate 31; the elastic buffer plate 31 is disposed in the receiving cavity 20 and connected to the base plate 1; the liquid cooling structure 4 is disposed in the receiving cavity 20, the liquid cooling structure 4 includes a liquid cooling plate 41 and a water nozzle 42, the liquid cooling plate 41 is connected to the side of the elastic buffer plate 31 away from the base plate 1, the water nozzle 42 is located on the side of the liquid cooling plate 41 away from the elastic buffer plate 31 and is welded to the liquid cooling plate 41 to form a weld 401; along the first direction Z, the elastic buffer plate 31 is located between the liquid cooling plate 41 and the base plate 1, the reinforcing plate 32 is located between the liquid cooling plate 41 and the base plate 1, and the weld 401 is correspondingly arranged with the reinforcing plate 32; wherein, along the first direction Z, the orthographic projection of the weld 401 on the base plate 1 is within the range of the orthographic projection of the reinforcing plate 32 on the base plate 1.

[0028] Based on this technical solution, by placing the elastic buffer plate 31 between the base plate 1 and the liquid cooling plate 41, when the base plate 1 is subjected to a bottom impact, the bottom impact force is first transmitted to the elastic buffer plate 31 and then to the liquid cooling plate 41. During this process, the elastic buffer plate 31 can absorb and buffer the impact force to reduce the impact force transmitted from the base plate 1 to the liquid cooling plate 41, thereby enabling the elastic buffer plate 31 to protect the liquid cooling plate 41 from damage and improve the safety performance of the battery pack.

[0029] By placing the reinforcing plate 32 between the base plate 1 and the liquid cooling plate 41, when the base plate 1 is subjected to a bottom impact, the bottom impact force is first transmitted to the reinforcing plate 32 and then to the liquid cooling plate 41 through the reinforcing plate 32. Since the weld 401 is correspondingly arranged with the reinforcing plate 32 and the orthographic projection of the weld 401 on the base plate 1 is within the range of the orthographic projection of the reinforcing plate 32 on the base plate 1, the external impact force is first transmitted to the reinforcing plate 32 and then to the weld 401 at the welding position of the water nozzle 42 and the liquid cooling plate 41 through the reinforcing plate 32. Since the hardness of the reinforcing plate 32 is greater than that of the elastic buffer plate 31, when the reinforcing plate 32 is subjected to bottom impact, the reinforcing plate 32 is less likely to deform and more effectively withstands and disperses the impact force compared to the elastic buffer plate 31. This allows the reinforcing plate 32 to provide key protection for the weld 401 at the welding position of the water nozzle 42 and the liquid cooling plate 41, more effectively reducing the impact force that can be transmitted to the weld 401 at the welding position of the water nozzle 42 and the liquid cooling plate 41, reducing the risk of weld 401 cracking, and improving the safety of the battery pack.

[0030] In this first embodiment, the elastic buffer plate 31 is made of modified polypropylene (MPP).

[0031] In other embodiments, the material of the elastic buffer plate 31 may also be an elastic material including but not limited to polyurethane foam (PU), rubber, silicone, etc.

[0032] In this first embodiment, the reinforcing plate 32 is made of aluminum alloy. Specifically, the reinforcing plate 32 can be made of commonly used aluminum alloys in the battery field, such as 5052 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, and 7075 aluminum alloy.

[0033] In some other embodiments, the reinforcing plate 32 may also be made of metal materials including but not limited to steel, iron alloys, etc.

[0034] See Figures 1 to 3 ,and Figures 5 to 7 The battery pack also includes a separator 6, which includes a first separator beam 61. The first separator beam 61 is disposed in the accommodating cavity 20, and the two ends of the first separator beam 61 in the second direction X are respectively connected to the inner walls of the two sides of the accommodating cavity 20. The battery 5 is located on one side of the first separator beam 61, and the water nozzle 42 is located on the side of the first separator away from the battery 5.

[0035] The separator 6 also includes a second separator beam 62 and a third separator beam 63. The second separator beam 62 is disposed within the accommodating cavity 20, and its two ends in the second direction X are respectively connected to the inner walls of both sides of the accommodating cavity 20. In the third direction Y, the battery 5 is located between the first separator beam 61 and the second separator beam 62, and the third separator beam 63 is located on the side of the second separator beam 62 opposite to the battery 5. The first separator beam 61, the second separator beam 62, and the third separator beam 63 divide the interior of the accommodating cavity 20 into a battery 5 mounting area, an electrical component mounting area, a cooling system mounting area, and a wiring harness arrangement area.

[0036] The battery pack also includes a cover plate 7, which is connected to the end of the frame 2 away from the base plate 1 and seals the receiving cavity 20.

[0037] In this first embodiment, the first direction Z corresponds to the height direction of the battery pack, the second direction X corresponds to the width direction of the battery pack, and the third direction Y corresponds to the length direction of the battery pack.

[0038] See Figures 2 to 6 ,and Figures 8 to 10 The elastic buffer plate 31 is provided with a mounting hole 3111 that runs through the first direction Z, and the reinforcing plate 32 is provided in the mounting hole 3111.

[0039] By embedding a reinforcing plate 32 into a localized area of ​​the elastic buffer plate 31, a high degree of integration between the rigid reinforcement structure (reinforcing plate 32) and the elastic buffer substrate (elastic buffer plate 31) is achieved. The advantage of this high integration is that reinforcement is only applied locally to critical areas corresponding to the weld 401 (such as the welding area between the water nozzle 42 and the liquid cooling plate 41). The high-hardness reinforcing plate 32 replaces part of the elastic buffer plate 31, improving the critical area's resistance to external impacts (such as bottom ball strikes), reducing the risk of weld 401 cracking, and preventing leakage risks caused by weld 401 cracking. In other areas, the original thickness and buffering performance of the elastic buffer plate 31 are retained, maintaining overall energy absorption and vibration reduction functions. Furthermore, this "embedding" method eliminates the need to thicken the elastic buffer plate 31 overall to improve local strength, avoiding problems such as wasted elastic material, increased weight, and space occupation. Thus, the structural optimization goal of "on-demand reinforcement and precise protection" can be achieved without increasing the total thickness of the battery pack bottom protection. In one embodiment, hardness refers to Shore hardness.

[0040] Optionally, the reinforcing plate 32 can be installed in the mounting hole 3111 by connecting it to the liquid cooling plate 41, by connecting it to the base plate 1, or by connecting it to the wall of the mounting hole 3111.

[0041] Preferably, the elastic buffer plate 31 includes multiple buffer sub-plates 311, one of which is provided with a mounting hole 3111. Dividing the elastic buffer plate 31 into multiple buffer sub-plates 311 allows for differentiated design and arrangement based on the internal structural layout and stress characteristics of the battery pack. For example, mounting holes 3111 can be provided on the buffer sub-plates 311 corresponding to critical protection areas such as liquid cooling plate welds and water taps, and reinforcing plates 32 can be embedded to achieve localized reinforcement; while conventional buffer structures are used in other non-critical areas, thereby achieving a refined design of "configuration as needed and functional zoning," avoiding material redundancy, and reducing overall weight and cost while ensuring protective performance. Furthermore, the split structure is beneficial for adapting to complex box shapes and internal component layouts, improving space utilization.

[0042] In this first embodiment, there are four buffer plates 311.

[0043] The protective structure 3 also includes an elastic buffer pad 33, at least a portion of which is disposed within the mounting hole 3111.

[0044] In this first embodiment, a portion of the elastic buffer pad 33 is disposed within the mounting hole 3111 along the first direction Z, between the liquid cooling plate 41 and the reinforcing plate 32. The reinforcing plate 32 is positioned directly close to the bottom plate 1, enabling it to respond immediately to impacts from the bottom (such as ball impacts), providing robust structural support and preventing excessive local deformation. The elastic buffer pad 33, positioned between the reinforcing plate 32 and the liquid cooling plate 41, serves as an intermediate transition layer. It can evenly transfer the impact force on the liquid cooling plate 41 to the reinforcing plate 32, avoiding stress concentration, and can also absorb high-frequency vibrations and transient impact energy through its own elastic deformation, reducing the direct impact on the liquid cooling plate 41 and the weld 401 formed between it and the water nozzle 42.

[0045] Optionally, the elastic cushioning pad 33 is connected to the side of the reinforcing plate 32 away from the base plate 1, and / or the reinforcing plate 32 is connected to the base plate 1.

[0046] The reinforcing plate 32 and the elastic buffer pad 33 can be assembled as a single component first, and then the component can be assembled with the liquid cooling plate 41 and / or the base plate 1. The assembly is simple.

[0047] In this first embodiment, the elastic cushioning pad 33 is made of modified polypropylene (MPP), and the material of the elastic cushioning pad 33 is the same as that of the elastic cushioning plate 31.

[0048] In other embodiments, the material of the elastic cushioning pad 33 may also be, but is not limited to, polyurethane foam (PU), rubber, silicone, etc.

[0049] In this first embodiment, the reinforcing plate 32 is bonded to the base plate 1 with structural adhesive. The structural adhesive not only ensures a reliable connection between the reinforcing plate 32 and the base plate 1, but also possesses good adhesive strength and a certain degree of elastic deformation capability. While transmitting loads, it can also act as a buffer and stress disperser, further reducing the impact force transmitted to the weld 401 at the welding position of the water nozzle 42 and the liquid cooling plate 41, thus further reducing the risk of weld 401 cracking.

[0050] In this first embodiment, the elastic buffer pad 33 is bonded to the reinforcing plate 32 with double-sided adhesive.

[0051] Preferably, at least one of the reinforcing plate 32 and the elastic buffer pad 33 is connected to the elastic buffer plate 31. When the reinforcing plate 32 and / or the elastic buffer pad 33 are connected to the elastic buffer plate 31, it can prevent the reinforcing plate 32 from shifting, loosening or falling off under battery pack transportation, vibration or impact conditions, and ensure that the reinforcing plate 32 is always accurately located directly below the weld 401, and continuously plays a local reinforcing and supporting role in the area where the weld 401 is located.

[0052] See Figures 6 to 10The mounting hole 3111 has a main hole portion 31111 and a positioning hole portion 31112 that are interconnected; the reinforcing plate 32 includes a plate body 321 and a positioning portion 322, the plate body 321 is located in the main hole portion 31111, and the positioning portion 322 is connected to the plate body 321 and located in the positioning hole portion 31112.

[0053] The main hole 31111 is used to accommodate the main support part of the reinforcing plate 32 (i.e., the plate body 321), and undertakes the protection function for the weld seam 401 area of ​​the liquid cooling plate 41. The positioning hole 31112 is used to accommodate the extension structure of the reinforcing plate 32 (i.e., the positioning part 322). Through the matching of shape and position, the reinforcing plate 32 is uniquely positioned within the mounting hole 3111, preventing the reinforcing plate 32 from rotating, shifting, or being installed in reverse during assembly, ensuring that it always accurately corresponds to the weld seam 401 position and plays an optimal protective role. Moreover, through the cooperation of the main hole 31111 and the positioning hole 31112, the reinforcing plate 32 can be limited. When the battery pack is subjected to vibration or impact loads, the relative movement of the reinforcing plate 32 in the plane is restricted, improving the structural stability of the reinforcing plate 32 under dynamic working conditions and avoiding protection failure due to displacement.

[0054] Example 2 See Figures 11 to 12 The battery pack provided in Embodiment 2 differs from the battery pack provided in Embodiment 1 in that all the elastic buffer pads 33 are located inside the mounting holes 3111, and along the first direction Z, the elastic buffer pads 33 are located between the base plate 1 and the reinforcing plate 32.

[0055] By setting an elastic buffer pad 33 between the base plate 1 and the reinforcing plate 32, the elastic buffer transition layer absorbs the vibration and stress transmitted from external impacts (such as bottom ball impacts) through the base plate 1 to the reinforcing plate 32, avoiding stress concentration or structural damage caused by rigid contact. On the other hand, the elastic buffer pad 33 can position and support the reinforcing plate 32, improve the stability of the reinforcing plate 32 under dynamic loads, and prevent it from shifting or loosening during impact, thereby ensuring its continuous and reliable protection effect on the weld 401 area.

[0056] Optionally, the elastic buffer pad 33 is connected to the side of the reinforcing plate 32 facing away from the liquid cooling plate 41; and / or, the elastic buffer pad 33 is connected to the base plate 1.

[0057] In this second embodiment, the side of the reinforcing plate 32 facing away from the elastic buffer pad 33 is connected to the liquid cooling plate 41, and the side of the elastic buffer pad 33 facing away from the reinforcing plate 32 is in contact with the base plate 1. The reinforcing plate 32 is directly connected to the liquid cooling plate 41 and can respond synchronously with the liquid cooling plate 41 to external impacts, providing immediate and stable local reinforcement support to the weld 401 area, effectively suppressing stress concentration in the weld 401 caused by local deformation of the liquid cooling plate 41, and improving the structural integrity and crack resistance of the welded joint. At the same time, the elastic buffer pad 33 is located between the reinforcing plate 32 and the base plate 1 and maintains contact with the base plate 1. The elastic buffer pad 33 can absorb vibration energy through elastic compression during impact, buffering the upward force transmitted by the base plate 1.

[0058] In this second embodiment, the reinforcing plate 32 is bonded to the liquid cooling plate 41 with structural adhesive. The elastic buffer pad 33 is bonded to the reinforcing plate 32 with double-sided adhesive.

[0059] In some other embodiments, the elastic cushioning pad 33 may also be bonded to the base plate 1.

[0060] Along the first direction Z, the thickness of the elastic buffer plate 31 is amm, the thickness of the reinforcing plate 32 is bmm, and the thickness of the elastic buffer pad 33 is cmm, satisfying: b+c≤a.

[0061] The dimensional relationship b+c≤a ensures that when the reinforcing plate 32 and the elastic buffer pad 33 are embedded in the mounting hole 3111 of the elastic buffer plate 31, the overall thickness of the three components does not exceed the original thickness range of the elastic buffer plate 31 in the thickness direction. This avoids structural interference or assembly difficulties caused by local protrusions and is conducive to the overall thin and light design of the battery pack.

[0062] It should be noted that in this utility model, "the thickness of the elastic buffer plate 31 along the first direction Z is a mm" refers to the original thickness of the elastic buffer plate 31 in the first direction Z when there is no external force and the elastic buffer plate 31 is in a free state (i.e., no elastic deformation such as compression or tension has occurred), denoted as a mm. Similarly, "the thickness of the elastic buffer pad 33 is c mm" refers to the initial thickness of the elastic buffer pad 33 in the first direction Z in a free state without pressure or elastic deformation, denoted as c mm. All thicknesses refer to the geometric dimensions of the material in a relaxed state and do not include deformation caused by assembly compression or working loads.

[0063] In this second embodiment, ab < 2, that is, the thickness of the elastic buffer plate 31 is greater than the thickness of the reinforcing plate 32, and the thickness difference between the two is less than 2 mm.

[0064] Example 3 See Figures 13 to 14The battery pack provided in Embodiment 3 differs from the battery pack provided in Embodiment 2 in that the protective structure 3 does not include the elastic buffer pad 33, and ab≥2.

[0065] When the thickness difference between the elastic buffer plate 31 and the reinforcing plate 32 is ≥2mm, there is sufficient space in the mounting hole 3111. Buffering can be achieved through air gaps or other buffer layers. Performance requirements can be met without the need for additional elastic buffer pad 33, thereby avoiding structural redundancy and reducing material costs and assembly complexity.

[0066] Example 4 See Figures 15 to 17 The battery pack provided in Embodiment 4 differs from the battery pack provided in Embodiment 1 in that the elastic buffer plate 31 is provided with a receiving groove 3112 on the side facing the liquid cooling plate 41, and the reinforcing plate 32 is housed in the receiving groove 3112. The receiving groove 3112 has a bottom wall 31121. Along the first direction Z, the reinforcing plate 32 is located between the liquid cooling plate 41 and the bottom wall 31121.

[0067] By embedding the reinforcing plate 32 into a groove in a local area of ​​the elastic buffer plate 31, the resistance of the weld 401 area to external impacts (such as bottom ball impact) can be improved, the risk of weld 401 cracking can be reduced, and the risk of leakage caused by cracking of the weld 401 of the liquid cooling plate 41 can be prevented. At the same time, it is not necessary to thicken the elastic buffer plate 31 as a whole to improve local strength, thus avoiding problems such as waste of elastic material, increased weight and space occupation.

[0068] The bottom wall 31121 of the receiving tank is composed of the body of the elastic buffer plate 31, which has the elastic buffer function. During the impact, it can undergo elastic deformation and absorb part of the vibration energy. Therefore, by placing the reinforcing plate 32 between the liquid cooling plate 41 and the bottom wall 31121, a multi-layer collaborative protection mechanism can be formed, in which "the upper reinforcing plate 32 provides rigid protection + the lower bottom wall 31121 realizes elastic energy dissipation". This further reduces the impact force that can be transmitted to the weld 401 at the welding position of the water nozzle 42 and the liquid cooling plate 41, and further reduces the risk of weld 401 cracking.

[0069] This utility model also provides an electrical device, which includes a battery pack according to any one of the above claims.

[0070] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack having a first orientation (Z), characterized in that, include: Base plate (1); A frame (2) is connected to the base plate (1) and surrounds the base plate (1) to form an accommodating cavity (20); The protective structure (3) includes an elastic buffer plate (31) and a reinforcing plate (32), wherein the hardness of the reinforcing plate (32) is greater than that of the elastic buffer plate (31); the elastic buffer plate (31) is disposed in the accommodating cavity (20) and connected to the bottom plate (1); A liquid cooling structure (4) is disposed in the accommodating cavity (20). The liquid cooling structure (4) includes a liquid cooling plate (41) and a water nozzle (42). The liquid cooling plate (41) is connected to the side of the elastic buffer plate (31) away from the bottom plate (1). The water nozzle (42) is located on the side of the liquid cooling plate (41) away from the elastic buffer plate (31) and is welded to the liquid cooling plate (41) to form a weld (401). Along the first direction (Z), the elastic buffer plate (31) is located between the liquid cooling plate (41) and the bottom plate (1). The reinforcing plate (32) is located between the liquid cooling plate (41) and the bottom plate (1). The weld (401) is correspondingly provided with the reinforcing plate (32). Wherein, along the first direction (Z), the orthographic projection of the weld (401) on the base plate (1) is within the range of the orthographic projection of the reinforcing plate (32) on the base plate (1).

2. The battery pack according to claim 1, characterized in that, The elastic buffer plate (31) is provided with a mounting hole (3111) extending along the first direction (Z), and the reinforcing plate (32) is disposed in the mounting hole (3111).

3. The battery pack according to claim 2, characterized in that, The protective structure (3) further includes an elastic buffer pad (33), which is disposed in the mounting hole (3111) along the first direction (Z) and between the base plate (1) and the reinforcing plate (32); The elastic buffer pad (33) is connected to the side of the reinforcing plate (32) away from the liquid cooling plate (41); and / or, the elastic buffer pad (33) is connected to the base plate (1).

4. The battery pack according to claim 2, characterized in that, The protective structure (3) further includes an elastic buffer pad (33), which is at least partially disposed in the mounting hole (3111) along the first direction (Z) and is disposed between the liquid cooling plate (41) and the reinforcing plate (32). The elastic buffer pad (33) is connected to the reinforcing plate (32) on the side opposite to the base plate (1), and / or the reinforcing plate (32) is connected to the base plate (1).

5. The battery pack according to claim 3, characterized in that, The reinforcing plate (32) is connected to the liquid cooling plate (41) on the side away from the elastic buffer pad (33), and the elastic buffer pad (33) is connected to the base plate (1) on the side away from the reinforcing plate (32).

6. The battery pack according to any one of claims 3-5, characterized in that, Along the first direction (Z), the thickness of the elastic buffer plate (31) is amm, the thickness of the reinforcing plate (32) is bmm, and the thickness of the elastic buffer pad (33) is cmm, satisfying: b+c≤a.

7. The battery pack according to claim 6, characterized in that, At least one of the reinforcing plate (32) and the elastic buffer pad (33) is connected to the elastic buffer plate (31).

8. The battery pack according to any one of claims 3-5, characterized in that, The mounting hole (3111) has a main hole portion (31111) and a positioning hole portion (31112) that are interconnected; The reinforcing plate (32) includes a plate body (321) and a positioning part (322). The plate body (321) is located inside the main hole (31111), and the positioning part (322) is connected to the plate body (321) and located inside the positioning hole (31112).

9. The battery pack according to claim 1, characterized in that, The elastic buffer plate (31) has a receiving groove (3112) on the side facing the liquid cooling plate (41), and the reinforcing plate (32) is housed in the receiving groove (3112). The receiving groove (3112) has a bottom wall (31121). Along the first direction (Z), the reinforcing plate (32) is located between the liquid cooling plate (41) and the bottom wall (31121).

10. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-9.

Images