Battery packs and electrical equipment

Abstract

This utility model provides a battery pack and an electrical device. The battery pack includes: a housing, comprising a frame and a base plate connected to the bottom of the frame, forming a receiving cavity between the frame and the base plate. The bottom of the frame has a support portion extending toward the center of the base plate, and the support portion overlaps with the base plate. A battery pack is disposed within the receiving cavity. The support portion supports a portion of the battery pack, and the base plate supports the remaining portion of the battery pack. In the direction from the support portion toward the center of the base plate, the projection of the battery pack onto the support portion has a first dimension L1mm, and the support portion has a second dimension L2mm. The first dimension L1mm is greater than half of the second dimension L2mm. The technical solution of this application effectively solves the problem of poor connection stability between the base plate and the frame in related technologies, which easily leads to breakage at the connection area between the base plate and the frame.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and electrical equipment. Background Technology

[0002] In related technologies, the base plate of the battery pack is mainly used to support the batteries inside the pack and is the main load-bearing structure. However, during the welding process between the base plate and the frame, the edges of the base plate are usually directly welded to the frame. Under conditions such as vibration, the batteries inside the pack exert a significant impact on the base plate, resulting in poor stability of the connection between the base plate and the frame. This can easily lead to breakage at the connection point between the base plate and the frame. Utility Model Content

[0003] The main purpose of this utility model is to provide a battery pack and electrical equipment to solve the problem of poor connection stability between the base plate and the frame in related technologies, which easily leads to the disconnection of the connection area between the base plate and the frame.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing, including a frame and a base plate connected to the bottom of the frame, wherein a receiving cavity is formed between the frame and the base plate, wherein the bottom of the frame has a support portion extending toward the center of the base plate, and the support portion overlaps with the base plate; a battery pack disposed within the receiving cavity, wherein the support portion supports a portion of the battery pack, and the base plate supports the remaining portion of the battery pack, wherein, in the direction of the support portion toward the center of the base plate, the projection of the battery pack onto the support portion has a first dimension L1mm, and the support portion 14 has a second dimension L2mm, wherein the first dimension L1mm is greater than 1 / 2 of the second dimension L2mm.

[0005] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0006] The battery pack using the technical solution of this utility model includes a housing and a battery pack. The housing includes a frame and a base plate connected to the bottom of the frame. A receiving cavity is formed between the frame and the base plate, wherein the bottom of the frame has a support portion extending toward the center of the base plate, and the support portion overlaps with the base plate. The battery pack is disposed in the receiving cavity, the support portion supports a portion of the battery pack, and the base plate supports the remaining portion of the battery pack. In the direction from the support portion toward the center of the base plate, the projection of the battery pack onto the support portion has a first dimension L1mm, and the support portion has a second dimension L2mm. The first dimension L1mm is greater than half of the second dimension L2mm. Thus, by having a support portion at the bottom of the frame and overlapping with the base plate, the connection strength between the frame and the base plate is improved. Simultaneously, a portion of the battery pack rests on the support portion, and the remaining portion rests on the base plate. The weight of the battery pack is shared by the base plate and the support portion, preventing the problem of easy breakage at the connection area between the base plate and the frame. Therefore, the technical solution of this application effectively solves the problem of poor connection stability between the base plate and the frame in related technologies, which easily leads to breakage at the connection area. Furthermore, since the setting of the first dimension L1mm being greater than 1 / 2 of the second dimension L2mm ensures that the support part and the support part share the weight of the battery pack, it can also effectively improve the stability of the support part supporting a portion of the battery pack. Attached Figure Description

[0007] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0008] Figure 1 A perspective structural schematic diagram of an embodiment of the battery pack according to the present invention is shown;

[0009] Figure 2 It shows Figure 1 A top view of the battery pack;

[0010] Figure 3 It shows Figure 1 A cross-sectional view of the battery pack;

[0011] Figure 4 It shows Figure 3 An enlarged schematic diagram of the structure at point A of the battery pack after rotating 90 degrees clockwise;

[0012] Figure 5 It shows Figure 4 An enlarged view of point B on the battery pack;

[0013] Figure 6 It shows Figure 1 A schematic diagram of the exploded structure of the battery pack;

[0014] Figure 7 It shows Figure 1 A three-dimensional structural diagram of the base plate of the battery pack.

[0015] The above figures include the following reference numerals:

[0016] 10. Box body; 11. Frame; 111. First side beam; 112. Second side beam; 113. Cavity; 12. Base plate; 121. Second step structure; 1211. Second horizontal plane; 1212. Second vertical plane; 13. Receiving cavity; 14. Support part; 141. First step structure; 1411. First horizontal plane; 1412. First vertical plane; 142. Support plate;

[0017] 20. Battery pack;

[0018] 30. Extension section; 31. Lifting position. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] According to one aspect of this application, a battery pack is provided, such as Figures 1 to 4 As shown, an embodiment of the battery pack includes a housing 10 and a battery pack 20. The housing 10 includes a frame 11 and a base plate 12 connected to the bottom of the frame 11. A receiving cavity 13 is formed between the frame 11 and the base plate 12, wherein the bottom of the frame 11 has a support portion 14 extending toward the center of the base plate 12, and the support portion 14 overlaps with the base plate 12. The battery pack 20 is disposed within the receiving cavity 13, the support portion 14 supports a portion of the battery pack 20, and the base plate 12 supports the remaining portion of the battery pack 20, wherein, in the direction of the support portion 14 toward the center of the base plate 12, the projection of the battery pack 20 onto the support portion 14 has a first dimension L1mm, and the support portion 14 has a second dimension L2mm, wherein the first dimension L1mm is greater than half of the second dimension L2mm.

[0023] In the technical solution of the embodiment of the battery pack, the support portion 14 supports a portion of the battery pack 20, and the base plate 12 supports the remaining portion of the battery pack 20. Thus, by having the support portion 14 at the bottom of the frame 11, and the support portion 14 overlapping the base plate 12, the connection strength between the frame 11 and the base plate 12 is improved. Simultaneously, a portion of the battery pack 20 rests on the support portion 14, and the remaining portion rests on the base plate 12. The weight of the battery pack is shared by the base plate 12 and the support portion 14, preventing the problem of easy breakage at the connection area between the base plate and the frame. Therefore, the technical solution of the embodiment of the battery pack effectively solves the problem of poor connection stability between the base plate and the frame in related technologies, which easily leads to breakage at the connection area. Furthermore, since the first dimension L1mm is greater than half of the second dimension L2mm, while ensuring that the support portion shares the weight of the battery pack, it also effectively improves the stability of the support portion supporting a portion of the battery pack.

[0024] like Figures 1 to 4As shown, the ratio of the first dimension L1mm to the second dimension L2mm satisfies: 0.55≤L1mm / L2mm≤1. Thus, by limiting the range of the ratio of the first dimension L1mm to the second dimension L2mm, the support portion 14 ensures that it can meet the load-bearing requirements of the battery pack. The weight of the battery pack is shared by the base plate 12 and the support portion 14, preventing the base plate from easily breaking off at the connection area with the frame.

[0025] The ratio of the first dimension L1mm to the second dimension L2mm is preferably 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, or 1.00.

[0026] It should be noted that the center of the base plate 12 refers to the position of the center point of the base plate 12 when viewed from above.

[0027] like Figures 1 to 4 As shown, the ratio of the first dimension L1mm to the second dimension L2mm satisfies: 0.65≤L1mm / L2mm≤0.85. Thus, by limiting the range of the ratio of the first dimension L1mm to the second dimension L2mm, the support part 14 is further guaranteed to meet the load-bearing requirements of the battery pack, so that the weight of the battery pack can be shared by the base plate 12 and the support part 14.

[0028] like Figures 1 to 4 As shown, in order to effectively improve the stability of the support part supporting the battery pack, the first dimension L1mm satisfies: 11mm≤L1mm≤60mm.

[0029] The first dimension L1mm is preferably 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, or 60mm.

[0030] like Figures 1 to 4 As shown, in order to ensure that the support part 14 can meet the load-bearing requirements of the battery pack, the second dimension L2mm satisfies: 20mm≤L2mm≤80mm.

[0031] The second dimension L2mm is preferably 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, 62mm, 64mm, 66mm, 68mm, 70mm, 72mm, 74mm, 76mm, 78mm, or 80mm.

[0032] like Figures 1 to 4 As shown, the frame 11 includes two first side beams 111 and two second side beams 112 arranged opposite to each other. Each second side beam 112 is connected between the ends of the two first side beams 111, and the support part 14 is provided at the bottom of the two first side beams 111. This facilitates the improvement of the structural strength of the connection between the support part 14 and the bottom of the two first side beams 111, and is conducive to realizing the overlapping connection between the support part 14 and the base plate 12.

[0033] like Figures 1 to 4 As shown, the support portion 14 is located at the bottom of the two second side beams 112. In this way, the support portion 14 can overlap and connect with the base plate 12, thereby improving the connection strength between the frame 11 and the base plate 12.

[0034] like Figures 1 to 4As shown, there is a first distance D1mm between the two first side beams 111, and a second distance D2mm between the two second side beams 112. In the direction from the support portion 14 toward the center of the base plate 12, the projection of the battery pack 20 onto the support portion 14 has a first dimension L1mm. The ratio of the first dimension L1mm to the first distance D1mm satisfies: 0.004 ≤ L1mm / D1mm ≤ 0.12. By limiting the range of the ratio between the first dimension L1mm and the first distance D1mm, this prevents insufficient connection strength between the frame and the base plate when the ratio is less than 0.004, and prevents the battery's heat dissipation efficiency from being affected when the ratio is greater than 0.12.

[0035] The preferred ratio of the first dimension L1mm to the first distance D1mm is 0.004, 0.006, 0.008, 0.010, 0.012, 0.014, 0.016, 0.018, 0.020, 0.022, 0.024, 0.026, 0.028, 0.030, 0.032, 0.034, 0.036, 0.038, 0.040, 0.042, 0.044, 0.046, 0.048, 0.050, 0.052, 0.054, 0.056, or 0.05. 8, 0.060, 0.062, 0.064, 0.066, 0.068, 0.070, 0.072, 0.074, 0.076, 0.078, 0.080, 0.082, 0.084, 0.086, 0.088, 0.090, 0.092, 0.094, 0.096, 0.098, 0.100, 0.102, 0.104, 0.106, 0.108, 0.110, 0.112, 0.114, 0.116, 0.118, or 0.120.

[0036] like Figures 1 to 4 As shown, the ratio of the first dimension L1mm and the second distance D2mm satisfies: 0.004 ≤ L1mm / D2mm ≤ 0.1. By limiting the range of the ratio between the first dimension L1mm and the second distance D2mm, it prevents insufficient connection strength between the frame and the base plate when the ratio is less than 0.004, and prevents the battery's heat dissipation efficiency from being affected when the ratio is greater than 0.1.

[0037] The preferred ratio of the first dimension L1mm to the second distance D2mm is 0.004, 0.006, 0.008, 0.010, 0.012, 0.014, 0.016, 0.018, 0.020, 0.022, 0.024, 0.026, 0.028, 0.030, 0.032, 0.034, 0.036, 0.038, 0.040, 0.042, 0.044, 0.046, or 0.04. 8, 0.050, 0.052, 0.054, 0.056, 0.058, 0.060, 0.062, 0.064, 0.066, 0.068, 0.070, 0.072, 0.074, 0.076, 0.078, 0.080, 0.082, 0.084, 0.086, 0.088, 0.090, 0.092, 0.094, 0.096, 0.098 or 0.100.

[0038] like Figures 3 to 7 As shown, the support portion 14 has a first step structure 141 on the side facing the base plate 12, and the base plate 12 has a second step structure 121 on the side facing the support portion 14. The second step structure 121 overlaps with the first step structure 141. In this way, the support portion 14 can overlap with the base plate 12, improving the connection strength between the frame 11 and the base plate 12.

[0039] like Figures 3 to 7 As shown, in order to ensure that the battery pack 20 can be placed flat inside the housing 10, the support part 14 includes a support plate 142 that is welded to the bottom plate 12, and the top surface of the support plate 142 is flush with the top surface of the bottom plate 12.

[0040] like Figures 3 to 7 As shown, the first step structure 141 has a first horizontal surface 1411, and the second step structure 121 has a second horizontal surface 1211 located above the first horizontal surface 1411 and in contact with it. In this way, the first horizontal surface 1411 and the second horizontal surface 1211 are in contact with each other, so that the first step structure 141 can stably support the second step structure 121, which facilitates the overlapping connection between the second step structure 121 and the first step structure 141.

[0041] like Figures 3 to 7 As shown, the width W1mm of the first horizontal plane 1411 is greater than or equal to 1mm and less than or equal to 20mm. In this way, by limiting the size range of the width W1mm of the first horizontal plane 1411, it can be ensured that the first step structure 141 can stably support the second step structure 121, and the connection strength of the second step structure 121 and the first step structure 141 can be guaranteed to achieve the overlapping connection.

[0042] The width W1mm of the first horizontal plane 1411 is preferably 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0043] like Figures 3 to 7 As shown, the width W2mm of the second horizontal plane 1211 is greater than or equal to 1mm and less than or equal to 20mm. In this way, by limiting the size range of the width W2mm of the second horizontal plane 1211, it can be ensured that the first step structure 141 can stably support the second step structure 121, and the connection strength of the second step structure 121 and the first step structure 141 to achieve the overlapping connection can also be guaranteed.

[0044] The width W2mm of the second horizontal plane 1211 is preferably 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0045] like Figures 3 to 7 As shown, the first step structure 141 has a first vertical surface 1412 that contacts and engages with the second step structure 121, and the second step structure 121 has a second vertical surface 1212 that contacts and engages with the first step structure 141. The second vertical surface 1212 is closer to the center of the base plate 12 than the first vertical surface 1412. This arrangement of the second vertical surface 1212 of the first vertical surface 1412 ensures that the first step structure 141 and the second step structure 121 abut smoothly, facilitating an overlapping connection between them.

[0046] like Figures 3 to 7 As shown, in order to facilitate the smooth contact between the first step structure 141 and the second step structure 121, the ratio of the height H1mm of the first vertical surface 1412 to the height H2mm of the second vertical surface 1212 satisfies: 0.1≤H1mm / H2mm≤1.

[0047] The ratio of the height H1mm of the first vertical surface 1412 to the height H2mm of the second vertical surface 1212 is preferably 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0.

[0048] like Figures 3 to 7As shown, the height H1mm of the first vertical surface 1412 is greater than or equal to 0.5mm and less than or equal to 4.5mm. In this way, by limiting the size range of the height H1mm of the first vertical surface 1412, it is possible to ensure that the first step structure 141 and the second step structure 121 can abut smoothly, and also to ensure the connection strength of the second step structure 121 and the first step structure 141 to achieve an overlapping connection.

[0049] The height H1mm of the first vertical plane 1412 is preferably 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm or 4.5mm.

[0050] like Figures 3 to 7 As shown, the height H2mm of the second vertical surface 1212 is greater than or equal to 0.5mm and less than or equal to 5mm. In this way, by limiting the size range of the height H2mm of the second vertical surface 1212, it is possible to ensure that the first step structure 141 and the second step structure 121 can abut together smoothly, and also to ensure the connection strength of the second step structure 121 and the first step structure 141 to achieve an overlapping connection.

[0051] The height H2mm of the second vertical plane 1212 is preferably 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5.0mm.

[0052] like Figures 3 to 7 As shown, the support portion 14 includes a support plate 142 welded to the base plate 12. The ratio of the thickness T1mm of the support plate 142 to the thickness T2mm of the base plate 12 satisfies: 0.1≤T1mm / T2mm≤1. Thus, by limiting the range of the ratio of the thickness T1mm of the support plate 142 to the thickness T2mm of the base plate 12, it prevents the support portion from occupying too much space when the ratio is greater than 1; and it prevents the connection strength between the support portion and the base plate from being insufficient when the ratio is less than 0.1.

[0053] The ratio of the thickness T1mm of the support plate 142 to the thickness T2mm of the base plate 12 is preferably 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0.

[0054] like Figures 3 to 7 As shown, in order to further improve the connection strength between the frame 11 and the base plate 12, the bottom of the frame 11 includes a bottom frame, which forms a support portion 14 and supports a part of the battery pack 20.

[0055] like Figures 1 to 3As shown, the housing 10 also includes an extension 30 connected to the outer side of the bottom of the frame 11, and a lifting position 31 is provided on the extension 30. The lifting position 31 facilitates the lifting of the battery pack.

[0056] like Figures 1 to 3 As shown, in order to improve the heat dissipation efficiency of the battery pack, the base plate 12 is a heat exchange plate, and a heat exchange channel is provided inside the heat exchange plate.

[0057] like Figures 1 to 3 As shown, in order to facilitate subsequent bolting operations on the frame 11, the frame 11 has multiple cavities 113 inside.

[0058] like Figures 1 to 3 As shown, the battery pack also includes a bottom protective plate, which is located at the bottom of the bottom plate 12 and spaced apart from the bottom plate 12. The bottom protective plate increases the protective function of the enclosure.

[0059] In this embodiment, the enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0060] The materials / composition of the aforementioned enclosure:

[0061] (1) The box includes a lower box, including a bottom plate and a side plate connected to and surrounding the bottom plate; an upper box is connected to the side plate and has a cover plate opposite to the bottom plate. The upper box and the lower box together enclose a receiving chamber.

[0062] (2) The battery pack box is generally composed of an upper box and a lower box. The lower box generally has four side plates and a bottom plate. The four side plates can be integrally formed with the bottom plate or can be processed and formed by separate fixed connection.

[0063] (3) The housing may include a bottom and a cover, the bottom and the cover covering each other, and the bottom and the cover together defining a storage space for accommodating the battery pack.

[0064] (4) The enclosure can be cast from materials such as steel plate and aluminum alloy, or lightweight materials such as glass fiber reinforced composite material and carbon fiber reinforced composite material.

[0065] (5) The shape of the box can be a cylinder, cuboid, cube, etc.

[0066] The aforementioned frame refers to the frame structure of the battery pack housing, which serves to provide support, protection, and connection.

[0067] The material / composition of the aforementioned border:

[0068] (1) The frame can be formed by splicing multiple beams together.

[0069] (2) The frame includes four sub-frames, which are connected end to end to form an enclosed space. The enclosed space is closed by the top cover and the bottom plate to form a receiving cavity.

[0070] (3) The frame can be made of various materials, such as aluminum alloy, copper alloy, steel, plastic, etc.

[0071] (4) The border can be rectangular, circular, polygonal, etc., and there are no specific limitations. The interior of the border can be a solid structure or contain cavities.

[0072] The aforementioned battery pack comprises multiple battery cells, which can be connected in series, parallel, or a combination of both to form a battery module. These battery modules can then be connected in series, parallel, or a combination of both to form a single unit. Multiple battery packs can be configured, such as four or eight, with no specific limitation. The battery pack is formed by connecting multiple battery cells of similar capacity and internal resistance in series or parallel. The battery pack may also include a housing, with one end open and connected to a heat exchange plate. The battery pack is housed within the housing.

[0073] The aforementioned battery pack includes a battery pack composed of multiple battery cells connected in series and / or in parallel to form 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. All of these components are placed inside a housing and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0074] (2) Battery packs, as a type of rechargeable battery, are the power source for new energy vehicles.

[0075] The materials / composition of the battery pack mentioned above:

[0076] (1) A battery pack generally includes a cell module, a battery management system (BMS) control module, and a housing that contains the cell module and the BMS control module.

[0077] (2) The battery pack includes a housing and multiple individual batteries housed in the housing. The housing is divided into upper and lower parts, which are sealed together.

[0078] (3) The battery pack includes at least two battery cells, a BMS control assembly and a casing.

[0079] (4) A battery pack generally includes a battery box and a battery pack. The battery box includes a lower box and a top cover.

[0080] (5) A battery pack generally includes a housing, battery cells and a separator. Both the battery cells and the separator are located in the housing. The separator is located on the side of the battery cell away from the bottom wall of the housing, separating the battery cell from other devices located above the battery cell, thus playing a role in isolation.

[0081] The aforementioned battery cells can be secondary or primary batteries, and can also be lithium-ion batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., but this embodiment of the invention is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes, etc., but this embodiment of the invention is not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, but this embodiment of the invention is not limited to these types either.

[0082] For example, a battery cell may include a casing, a cell, and an electrolyte, with the casing housing the cell and electrolyte. The cell also includes a separator. A battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0083] The battery cell may have terminals or other components connected to adapters, with the terminals serving as the electrical connection points. Furthermore, the battery cell typically includes a pressure relief section. In the event of excessive internal pressure (e.g., thermal runaway), this section releases substances (e.g., gases, liquids, particulate matter) from the cell's interior, reducing internal pressure and preventing rapid pressurization that could lead to dangerous accidents such as cell explosions. For example, the pressure relief section can be an explosion-proof valve or explosion-proof plate. The adapter is preferably a connecting plate, and preferably a conductive structure. Any adjacent positive and negative electrodes are separated by a diaphragm.

[0084] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0085] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0086] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure. A wound cell is generally manufactured by winding continuous positive and negative electrodes and a separator, with the separator located between adjacent positive and negative electrodes. A stacked cell is manufactured by stacking positive and negative electrodes and a separator, where the positive and negative electrodes are separated by a separator, and adjacent layers of positive and / or negative electrodes within the cell are discontinuous. The stacking process includes layering or Z-shaped folding, etc. The embodiments of this application are not limited to these.

[0087] According to another aspect of this application, an electrical device is provided, including a battery pack, which is the battery pack described above. The battery pack is capable of providing electrical energy to the electrical device. Since the battery pack described above can solve the problem of poor connection stability between the base plate and the frame in related technologies, which easily leads to breakage in the connection area between the base plate and the frame, the electrical device including this battery pack can also solve the same technical problem.

[0088] The electrical equipment disclosed in this utility model embodiment can be, but is not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. When the electrical equipment is a vehicle, the battery pack can be located at the bottom, front, or rear of the vehicle.

[0089] In the description of this utility model, it should be understood that "multiple" means a quantity of two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0092] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The box (10) includes a frame (11) and a bottom plate (12) connected to the bottom of the frame (11), and a receiving cavity (13) is formed between the frame (11) and the bottom plate (12). The bottom of the frame (11) has a support portion (14) extending toward the center of the bottom plate (12), and the support portion (14) overlaps with the bottom plate (12). A battery pack (20) is disposed in the receiving cavity (13), the support (14) supports a part of the battery pack (20), and the base plate (12) supports the rest of the battery pack (20); In the direction of the support (14) toward the center of the base plate (12), the projection of the battery pack (20) on the support (14) has a first dimension L1mm, and the support (14) has a second dimension L2mm, wherein the first dimension L1mm is greater than 1 / 2 of the second dimension L2mm.

2. The battery pack according to claim 1, characterized in that, The ratio of the first dimension L1mm to the second dimension L2mm satisfies: 0.55≤L1mm / L2mm≤1.

3. The battery pack according to claim 1, characterized in that, The ratio of the first dimension L1mm to the second dimension L2mm satisfies: 0.65≤L1mm / L2mm≤0.

85.

4. The battery pack according to claim 2, characterized in that, The first dimension L1mm satisfies: 11mm≤L1mm≤60mm.

5. The battery pack according to claim 2, characterized in that, The second dimension L2mm satisfies: 20mm≤L2mm≤80mm.

6. The battery pack according to claim 1, characterized in that, The frame (11) includes two first side beams (111) and two second side beams (112) arranged opposite to each other. Each second side beam (112) is connected between the ends of the two first side beams (111). The support (14) is disposed at the bottom of the two first side beams (111).

7. The battery pack according to claim 6, characterized in that, The support (14) is located at the bottom of the two second side beams (112).

8. The battery pack according to claim 6, characterized in that, There is a first distance D1mm between the two first side beams (111) and a second distance D2mm between the two second side beams (112). In the direction of the support (14) toward the center of the base plate (12), the projection of the battery pack (20) on the support (14) has a first dimension L1mm. The ratio of the first dimension L1mm to the first distance D1mm satisfies: 0.004≤L1mm / D1mm≤0.

12.

9. The battery pack according to claim 8, characterized in that, The ratio of the first dimension L1mm to the second distance D2mm satisfies: 0.004≤L1mm / D2mm≤0.

1.

10. The battery pack according to claim 1, characterized in that, The support part (14) has a first step structure (141) on the side facing the base plate (12), and the base plate (12) has a second step structure (121) on the side facing the support part (14). The second step structure (121) overlaps with the first step structure (141).

11. The battery pack according to claim 10, characterized in that, The support part (14) includes a support plate (142) welded to the base plate (12), and the top surface of the support plate (142) is flush with the top surface of the base plate (12).

12. The battery pack according to claim 10, characterized in that, The first step structure (141) has a first horizontal surface (1411), and the second step structure (121) has a second horizontal surface (1211) located above the first horizontal surface (1411) and in contact with it.

13. The battery pack according to claim 12, characterized in that, The width W1mm of the first horizontal plane (1411) is greater than or equal to 1mm and less than or equal to 20mm; and / or the width W2mm of the second horizontal plane (1211) is greater than or equal to 1mm and less than or equal to 20mm.

14. The battery pack according to claim 10, characterized in that, The first step structure (141) has a first vertical surface (1412) that contacts and engages with the second step structure (121), and the second step structure (121) has a second vertical surface (1212) that contacts and engages with the first step structure (141). The second vertical surface (1212) is closer to the center of the base plate (12) than the first vertical surface (1412).

15. The battery pack according to claim 14, characterized in that, The ratio of the height H1mm of the first vertical plane (1412) to the height H2mm of the second vertical plane (1212) satisfies: 0.1≤H1mm / H2mm≤1.

16. The battery pack according to claim 15, characterized in that, The height H1mm of the first vertical plane (1412) is greater than or equal to 0.5mm and less than or equal to 4.5mm.

17. The battery pack according to claim 15, characterized in that, The height H2mm of the second vertical plane (1212) is greater than or equal to 0.5mm and less than or equal to 5mm.

18. The battery pack according to claim 1, characterized in that, The support part (14) includes a support plate (142) welded to the base plate (12), and the ratio of the thickness T1mm of the support plate (142) to the thickness T2mm of the base plate (12) satisfies: 0.1≤T1mm / T2mm≤1.

19. The battery pack according to claim 1, characterized in that, The bottom of the frame (11) includes a bottom frame that forms the support (14) and supports a portion of the battery pack (20).

20. The battery pack according to claim 1, characterized in that, The housing (10) also includes an extension (30) connected to the outside of the bottom of the frame (11), and the extension (30) is provided with a hoisting position (31).

21. The battery pack according to claim 1, characterized in that, The base plate (12) is a heat exchange plate, and a heat exchange channel is provided inside the heat exchange plate.

22. The battery pack according to claim 1, characterized in that, The frame (11) has multiple cavities (113) inside.

23. The battery pack according to claim 1, characterized in that, The battery pack also includes a bottom protective plate, which is disposed at the bottom of the bottom plate (12) and spaced apart from the bottom plate (12).

24. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 23.

Images