Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electrical equipment, and battery pack includes box and multiple battery monomers, box includes bottom plate and frame, bottom plate and frame are enclosed into containing cavity, containing cavity is separated into at least two battery compartments by middle beam, heating element is arranged on bottom plate, battery monomer is placed on bottom plate, heating element is between bottom plate and battery monomer;Middle beam is provided with the communication opening of intercommunication of adjacent two battery compartments, heating element is arranged in the communication opening, in the first direction, along the length direction of the middle beam, the section area of the communication opening is A1 mm 2 , the section area of the middle beam is A2 mm 2 , A1 / A2 The range is 0.0018-0.02.The utility model can guarantee the structural strength of middle beam, and also can avoid the hole wall distance of communication opening being too close to heating element, leading to the heat generated by heating element being taken away by middle beam, affecting the heating efficiency of heating element to battery.

Description

Technical Field

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

[0002] Electric vehicles are new energy vehicles powered by batteries. These batteries are lithium-ion batteries, which possess advantages such as high energy density, fast charging capability, and long cycle life. To improve the performance of the batteries in low-temperature environments and enable individual battery cells to quickly enter fast charging, rapid heating of the individual cells is necessary. In existing technologies, heating elements are installed inside the battery pack, with the individual battery cells positioned on these elements. The heating elements heat the individual battery cells, causing them to heat up rapidly and thus enter fast charging mode.

[0003] A battery pack typically contains a battery assembly composed of multiple individual battery cells. To prevent thermal runaway of one battery cell from affecting the operation of another, the chamber containing the battery cells is divided into two or more battery compartments. The heating tubes in two adjacent battery compartments need to pass through the intermediate beam between the battery compartments, which can affect the structural strength of the intermediate beam. Furthermore, the intermediate beam can easily carry away the heat from the heating tubes. Utility Model Content

[0004] In view of this, the present invention provides a battery pack in which the heating element has higher heating efficiency for individual battery cells and the middle beam has better structural strength.

[0005] This utility model also provides an electrical device.

[0006] To achieve the above objectives, in a first aspect, the battery pack of this utility model provides the following technical solution:

[0007] A battery pack includes a housing and multiple battery cells. The housing includes a base plate and a frame connected to the surface of the base plate. The base plate and the frame form a cavity for housing the battery cells. The cavity is divided into at least two battery compartments by a central beam. A heating element is disposed on the base plate. The battery cells are placed on the base plate, and the heating element is located between the base plate and the battery cells. A connecting opening is provided on the central beam to connect two adjacent battery compartments. A portion of the heating element passes through the connecting opening. The connecting opening is cut along the length of the central beam in a first direction, and the cross-sectional area of ​​the connecting opening is A1 mm. 2 The cross-sectional area of ​​the intermediate beam is A2 mm. 2 The range of A1 / A2 is 0.0018-0.02.

[0008] As can be seen from the above technical solution, the battery pack provided by this utility model has a heating element on the bottom plate to heat the battery cells, meeting the requirements for use of the battery cells in low-temperature environments; a connecting opening is provided on the middle beam for the heating element to pass through, facilitating the heating element to heat the battery cells located on both sides of the middle beam. The area of ​​the connecting opening end is A1mm. 2 The area A2 mm of the surface of the opening connected to the intermediate beam. 2 The ratio of A1 / A2 is limited to ensure it remains within a suitable range. This avoids excessively affecting the structural strength of the intermediate beam while preventing the wall of the connecting opening from being too close to the heating element, which could lead to heat loss from the heating element. This reduces the probability of the intermediate beam carrying away heat from the heating element. The battery pack of this invention features higher heating efficiency for individual battery cells and better structural strength of the intermediate beam.

[0009] Secondly, this utility model also provides an electrical device, including a battery pack, which is the battery pack described in the above embodiment.

[0010] The electrical equipment of this utility model includes the battery pack of the above embodiment, and therefore has the advantages of the battery pack described above, which will not be repeated here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the battery pack from one angle provided in an embodiment of this utility model;

[0013] Figure 2 This is a structural schematic diagram of the battery pack provided in an embodiment of the present invention from another angle;

[0014] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0015] Figure 4 for Figure 3 A partially enlarged structural diagram of part B in the diagram;

[0016] Figure 5 A schematic diagram of the structure of the intermediate beam provided in an embodiment of this utility model;

[0017] Figure 6A partially enlarged structural schematic diagram of the location of the connecting opening provided in another embodiment of this utility model;

[0018] Figure 7 A partially enlarged structural schematic diagram of the location of the connecting opening provided in another embodiment of this utility model;

[0019] Figure 8 This is a schematic diagram of the structure of a heat insulation sleeve provided in an embodiment of the present invention;

[0020] Figure 9 A structural schematic diagram of the box body at one angle provided in an embodiment of this utility model;

[0021] Figure 10 This is a structural schematic diagram of the box body from another angle provided in an embodiment of the present utility model;

[0022] Figure 11 for Figure 10 A cross-sectional view of the CC position in the diagram.

[0023] in:

[0024] 1. Box body,

[0025] 101. Base plate; 102. Frame; 1021. First frame plate; 1022. Second frame plate.

[0026] 2. Battery cell,

[0027] 3. Heating element,

[0028] 301. Main heating pipe; 302. End connecting pipe.

[0029] 4. Intermediate beam,

[0030] 401. Connecting opening,

[0031] 5. Heat insulation sleeve,

[0032] 501. Install through holes. Detailed Implementation

[0033] This utility model discloses a battery pack with a heating element that provides higher heating efficiency for individual battery cells and a stronger structural strength for the intermediate beam.

[0034] This utility model also discloses an electrical device.

[0035] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] A battery pack comprises a battery array consisting of multiple battery cells connected in series and / or parallel, 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 parts. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. As a rechargeable battery, the battery pack is the power source for new energy vehicles.

[0037] A battery cell can store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, the active materials can be reactivated by charging after discharge, allowing for continued use. A battery cell includes a casing and a battery cell housed within the casing.

[0038] The enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0039] The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components inside the enclosure, ensuring their relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The battery pack enclosure generally consists of an upper enclosure and a lower enclosure. The lower enclosure typically has four side panels and a bottom plate. The four side panels can be integrally formed with the bottom plate or manufactured separately and fixedly connected. The enclosure can be cast from materials such as steel plate, aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0040] The battery pack enclosure consists of a base plate and a frame. The base plate is the main load-bearing component, typically referring to the structural member installed at the bottom of the battery pack, used to support and secure the battery pack, battery management system, cooling system, and other components inside. The base plate is located at the bottom of the enclosure frame, for example, by welding, riveting, or screwing. The base plate can be made of various materials, such as high-strength materials like aluminum alloy, steel, and stainless steel. The base plate can be rectangular, circular, polygonal, or a plate-like structure; its specific shape is not limited, and its dimensions are determined by the number and size of the battery cells housed in the battery pack.

[0041] The frame is the structural framework of the battery pack housing, serving a supporting, protective, and connecting function. The frame can be formed by splicing together multiple beams. In existing technologies, the frame typically includes four sub-frames, which are connected end-to-end to form an enclosed space. This enclosed space is sealed by a top cover and a bottom plate to form a receiving cavity. The frame can be made of various materials, such as aluminum alloy, copper alloy, steel, and plastic. The frame can be rectangular, circular, polygonal, etc., with no specific limitations. The interior of the frame can be a solid structure or contain hollow cavities.

[0042] The enclosure may also include partition beams, which are positioned within the battery pack housing space and extend laterally or longitudinally to divide the housing space into multiple sub-spaces. The partition beams are fixedly connected to the side walls of the enclosure, which may be frames. The partition beams divide the internal space of the enclosure into multiple sub-spaces, with different battery module components housed in different sub-spaces. The partition beams may be strip-shaped, with each end connected to one of the two side walls of the enclosure to divide the interior into two sub-spaces located on either side of the partition beam. The partition beams may be made of metal, such as aluminum, or integrally molded using rubber injection molding, plastic injection molding, or molding injection molding. Plastic injection molding may use plastics such as polyethylene, polypropylene, ABS, PA, or polystyrene. The partition beams may be formed by die casting or other methods such as extrusion molding, and then welded to the two side walls of the enclosure.

[0043] See Figures 1 to 11 The battery pack of this utility model includes a housing 1 and multiple battery cells 2. The housing 1 includes a base plate 101 and a frame 102 connected to the surface of the base plate 101. The base plate 101 and the frame 102 form a cavity for placing the battery cells 2. The cavity is divided into at least two battery compartments by a central beam 4. A heating element 3 is provided on the base plate 101, and the battery cells 2 are placed on the base plate 101. The heating element 3 is located between the base plate 101 and the battery cells 2. To facilitate the heating element 3 to penetrate all battery compartments and heat the battery cells 2 in the battery compartments, a connecting opening 401 is provided on the central beam 4 to connect two adjacent battery compartments. A portion of the heating element 3 passes through the connecting opening 401, such as... Figure 1and Figure 2 As shown, in the first direction, and along the length of the intermediate beam 4, that is, along the length of the intermediate beam 4, a section is cut from the top of the intermediate beam 4 to the bottom of the box body 1 (see...). Figure 2 The section line AA in the diagram connects to the section area of ​​the opening 401, which is A1 mm. 2 The cross-sectional area of ​​intermediate beam 4 is A2 mm. 2 A1 is specifically Figure 5 The area of ​​the grid line region in A2 is Figure 5 The area of ​​the slanted region in the figure, A1 / A2, ranges from 0.0018 to 0.02. The value of A1 / A2 can be any value among 0.0018, 0.005, 0.01, 0.015, 0.02, etc., or a value between any two values.

[0044] Among them, A2 mm 2 This refers to the area of ​​the surface of the intermediate beam 4 closest to the battery cell 2, A1 mm. 2 The area of ​​the end of a connecting opening 401, where the end refers to the area of ​​the end of the connecting opening 401 closest to the battery cell 2, and the first direction can be understood as the height direction of the housing 1 (see...). Figure 1 The range of A1 / A2 is controlled within the above-mentioned range to ensure that the heating element 3 can easily pass through the intermediate beam 4, while reducing the impact of the connecting opening 401 on the structural strength of the intermediate beam 4. It also reduces the probability that the heat from the heating element 3 will be carried away by the intermediate beam 4. If the value of A1 / A2 is too large, the area of ​​the connecting opening 401 will be large, thus significantly affecting the structural strength of the intermediate beam 4. If the value of A1 / A2 is too small, the area of ​​the connecting opening 401 will be small, and the distance between the intermediate beam 4 and the heating element 3 will be too close. This not only makes it difficult for the heating element 3 to pass through the connecting opening 401, but also makes it easier for the heat from the heating element 3 to be carried away by the intermediate beam 4, affecting the heating efficiency of the battery cell 2. The intermediate beam 4 is the partition beam of the housing 1.

[0045] The battery pack of this utility model has a heating element 3 on the base plate 101 to heat the battery cells 2, meeting the requirements for use of the battery cells 2 in low-temperature environments; a connecting opening 401 is provided on the intermediate beam 4 for the heating element 3 to pass through, facilitating the heating element 3 to heat the battery cells 2 located on both sides of the intermediate beam 4. The area A1mm of the connecting opening 401 is... 2 The area A2 mm of the surface of the opening 401 connected to the intermediate beam 4. 2The ratio of A1 / A2 is limited to ensure it remains within a suitable range. This avoids excessively affecting the structural strength of the intermediate beam 4 while preventing the heat from being carried away by the heating element 3 due to the hole wall of the connecting opening 401 being too close to it. This reduces the probability of the intermediate beam 4 carrying away heat from the heating element 3. In this battery pack, the heating element 3 provides higher heating efficiency for the battery cells 2, and the intermediate beam 4 exhibits better structural strength.

[0046] To facilitate the installation of the heating element 3 on the base plate 101, a connecting opening 401 is provided on the intermediate beam 4 near the base plate 101. In one embodiment, as... Figure 3 and Figure 4 As shown, the connecting opening 401 is an opening located at the bottom of the intermediate beam 4, and one side of the connecting opening 401 is directly connected to the surface of the base plate 101. In one embodiment, referring to... Figure 1 and Figure 2 In this embodiment, the surface of the intermediate beam 4 closest to the battery cell 2 is arranged perpendicular to the second direction, and the intermediate beam 4 extends along a direction perpendicular to the second direction. In another embodiment, the surface of the intermediate beam 4 closest to the battery cell 2 may also be arranged parallel to the second direction; this is not a limitation. The second direction is perpendicular to the first direction.

[0047] In order to facilitate the arrangement of the heating element 3 on the base plate 101, the center line of the connecting opening 401 is set perpendicular to the surface of the intermediate beam 4 on which the connecting opening 401 is set. This structural arrangement makes it easy for the heating element 3 to pass through the connecting opening 401 on the intermediate beam 4.

[0048] In one specific embodiment, A1 mm 2 The range is 30 mm 2 -150mm 2 A2 mm 2 The range is 7500 mm 2 -16800mm 2 By using A1 mm 2 and A2 mm 2 Within the aforementioned range, the excessively large size of the connecting opening 401 is avoided from affecting the structural strength of the intermediate beam 4. A1 mm 2 It can be 30mm 2 60mm 2 90 mm 2 120 mm 2 150 mm 2 Any value in the range or a value between any two values. A2 mm 2 It can be 7500mm 2 9000mm 2 12000mm 215000 mm 2 16800mm 2 It can be any value in the set or any value between any two values.

[0049] Understandably, to avoid direct contact between the intermediate beam 4 and the heating element 3, resulting in heat dissipation, the heating element 3 is spaced apart from the wall of the connecting opening 401. To create an insulating space, the distance between the wall of the heating element 3 and the wall of the connecting opening 401 is L1mm. Figure 4 As shown, L1mm ranges from 2mm to 10mm. L1mm can be any value among 2mm, 3mm, 5mm, 8.5mm, 10mm, etc., or a value between any two values. It should be noted that the distance L1mm can be the interval between any position of the tube wall of the heating element 3 and the hole wall of the connecting opening 401, and is not limited to this. Figure 4 The interval distance between the positions in the middle, Figure 4 The diagram below only shows the distance between the two components at one location. By limiting the distance between the wall of the heating element 3 and the wall of the connecting opening 401, it not only prevents the wall of the connecting opening 401 from getting too close to the heating element 3, but also prevents the distance between the wall of the connecting opening 401 and the heating element 3 from being too large, which would affect the structural strength of the intermediate beam 4. If the value of L1 is too large, it will affect the structural strength of the intermediate beam 4; if it is too small, the heat from the heating element 3 will be easily carried away by the intermediate beam 4, affecting the heating efficiency of the heating element 3 for the battery cell 2.

[0050] Furthermore, the connecting opening 401 can be a round hole, a trapezoidal hole, or a rectangular hole, or it can be a through hole of other shapes; there is no limitation here. For example... Figures 3-5 As shown, the connecting opening 401 is a rectangular hole. Figure 6 As shown, the connecting opening 401 is an arc-shaped hole. The heating element 3 can be a rectangular tube, such as... Figure 4 and Figure 6 As shown, it can also be a circular tube, or a tube of other shapes.

[0051] In one embodiment, the connecting opening 401 is an isosceles trapezoidal hole located on the intermediate beam 4 near the bottom plate 101, such as... Figure 7 As shown, the short side of the isosceles trapezoidal hole is located at the position of the connecting opening 401 away from the bottom plate 101, and the two equal-length sides of the isosceles trapezoidal hole are located on both sides of the heating element 3. The connecting opening 401 of this structure is beneficial to ensuring the structural strength of the intermediate beam 4 after the opening is made.

[0052] The distance between the connecting opening 401 and the surface of the intermediate beam 4 away from the bottom plate 101 is L2mm, such as... Figure 5As shown, L2mm ranges from 65mm to 110mm. L2mm can be any value among 65mm, 80mm, 90mm, 100mm, and 110mm, or a value between any two values. The surface of the intermediate beam 4 furthest from the base plate 101 is the top surface of the intermediate beam 4 furthest from the base plate 101. Limiting L2 within the above range not only reduces the heat carried away by the heating element 3 by the intermediate beam 4, but also ensures the structural strength of the intermediate beam 4. If the value of L2 is too large, the heat of the heating element 3 will be easily carried away by the intermediate beam 4; if the value of L2 is too small, it will affect the structural strength of the intermediate beam 4.

[0053] Specifically, the two ends of the intermediate beam 4 are connected to the frame 102, and the intermediate beam 4 is provided with at least one connecting opening 401. To ensure the structural strength of the intermediate beam 4 near the end of the frame 102, the distance between the connecting opening 401 and the end of the intermediate beam 4 near the frame 102 needs to be limited. The distance between the connecting opening 401 and the end of the intermediate beam 4 near the frame 102 is L3mm. Figure 5 As shown, L3mm ranges from 30mm to 200mm. L3mm can be any value among 30mm, 90mm, 120mm, 160mm, 200mm, etc., or a value between any two values. If the value of L3 is too large, it will affect the heating efficiency of the heating element 3; if the value of L3 is too small, it will affect the connection strength between the intermediate beam 4 and the frame 102.

[0054] The heating element 3 can be a heating tube, a heating wire, or other commonly used heating structures, such as a heating film or a heating plate; no limitation is made here. When the heating element 3 is a heating tube, a heating medium is introduced into the heating tube to heat the battery cell 2. The heating medium can be a liquid or a gas.

[0055] In one embodiment, the heating element 3 is a heating tube, which is coiled on the base plate 101, such as... Figure 9 and Figure 10 As shown, the heating tube includes a main heating pipe 301 and an end connecting pipe 302 connected together. The main heating pipe 301 extends perpendicularly to the intermediate beam 4 and passes through the connecting opening 401. Adjacent main heating pipes 301 are connected through the end connecting pipes 302. The main heating pipes 301 are connected through the end connecting pipes 302 to form heating channels, which are arranged on the base plate 101 to facilitate heating of the battery cells 2. It can be understood that in order to improve the uniformity of heating of the battery cells 2, the bottom of each battery cell 2 is in contact with the heating element 3. The end connecting pipes 302 are arranged parallel to the intermediate beam 4 so that the main heating pipes 301 and the end connecting pipes 302 form an S-shaped or U-shaped flow channel.

[0056] To improve heating efficiency, the distance between the end connecting pipe 302 and the intermediate beam 4 is L4mm, such as... Figure 10 As shown, L4mm ranges from 200mm to 900mm. L4mm can be any value among 200mm, 350mm, 500mm, 700mm, and 900mm, or a value between any two values. Setting L4 within the above range can increase the length of the heating channel, ensuring heating uniformity and heating efficiency. If the value of L4 is too small, the heat generated by the heating tube will be insufficient, and it will easily affect the heating uniformity of the battery cell 2 by the heating tube, and the heat of the end connecting pipe 302 will easily be carried away by the intermediate beam 4; if the value of L4 is too large, the heat of the end connecting pipe 302 will easily be carried away by the frame 102.

[0057] In one embodiment, the frame 102 includes a first frame plate 1021 and a second frame plate 1022 connected together, and two of each of the first frame plate 1021 and the second frame plate 1022 are provided, such as... Figure 9 and Figure 10 The first frame plate 1021 is perpendicular to the intermediate beam 4, and each end of the intermediate beam 4 is connected to a first frame plate 1021. The second frame plate 1022 is parallel to the intermediate beam 4. The distance between the heating main tube 301 and the first frame plate 1021 is L5mm, and L5mm ranges from 32mm to 205mm. L5mm can be any value among 32mm, 60mm, 110mm, 150mm, and 205mm, or a value between any two values. Setting L5 within the above range can ensure the uniformity and efficiency of heating the battery cell 2, and also reduce the probability that the heat from the heating main tube 301 will be carried away by the first frame plate 1021. If the value of L5 is too small, the probability of the heat from the heating main tube 301 being carried away by the first frame plate 1021 will be higher; if the value is too large, the heat generated by the heating main tube 301 will be insufficient, which will affect the uniformity of heating the battery cell 2 by the heating tube and reduce the heating efficiency.

[0058] To ensure heating efficiency while reducing the difficulty of flow channel forming, the spacing between adjacent heating main tubes 301 is L6mm, with L6mm ranging from 20mm to 200mm. L6mm can be any value among 20mm, 50mm, 100mm, 150mm, and 200mm, or a value between any two values. If the value of L6 is too large, the distance between adjacent heating main tubes 301 will be too large, affecting the heating efficiency of the heating tubes. If the value of L6 is too small, the bent heating tubes will be difficult to form, increasing the forming difficulty.

[0059] To further reduce the heat carried away by the heating element 3 by the intermediate beam 4, a heat insulation sleeve 5 is provided inside the connecting opening 401, such as... Figure 8As shown, the heat insulation sleeve 5 is provided with mounting through holes 501 connecting two adjacent battery compartments. The heating element 3 passes through the mounting through holes 501, so that the heat insulation sleeve 5 covers the position where the heating element 3 passes through the intermediate beam 4, preventing the heat generated by the heating element 3 from being carried away by the intermediate beam 4. The heat insulation sleeve 5 is made of materials commonly used in the art, such as polystyrene. To ensure the heat insulation effect, the axial dimension of the heat insulation sleeve 5 along the connecting opening 401 is not less than the axial dimension of the connecting opening 401, so that the outer surface of the heating element 3 will not directly contact the hole wall of the connecting opening 401, that is, the outer surface of the heating element 3 will not directly contact the intermediate beam 4, reducing the probability that the heat of the heating element 3 will be conducted away through the intermediate beam 4. It can be understood that the shape and size of the surface of the heat insulation sleeve 5 near the connecting opening 401 are set with reference to the connecting opening 401. The heat insulation sleeve 5 here can be a ring sleeve or a block structure of other shapes, which is not limited here.

[0060] To prevent the heat insulation sleeve 5 from shifting relative to the connecting opening 401 of the intermediate beam 4, the outer surface of the heat insulation sleeve 5 is tightly abutted or fixedly connected to the surface of the connecting opening 401. This prevents the heat insulation sleeve 5 from shifting under external force, ensuring heat insulation between the heating element 3 and the connecting opening 401. Specifically, the outer surface of the heat insulation sleeve 5 can be bonded to the surface of the connecting opening 401, or other commonly used fixing methods can be used; no limitation is made here. Preferably, the material of the heat insulation sleeve 5 needs to be selected that not only has heat insulation properties but also electrical insulation properties.

[0061] In one embodiment, multiple intermediate beams 4 are provided, and the multiple intermediate beams 4 are arranged at intervals along a second direction. In the second direction, the connecting openings 401 on adjacent intermediate beams 4 are arranged opposite each other; or, in the second direction, the connecting openings 401 on adjacent intermediate beams 4 are staggered. The specific arrangement position is set according to actual needs. Figure 9 As shown, there are two intermediate beams 4, which divide the receiving cavity into three battery compartments. Each intermediate beam 4 has four connecting openings 401.

[0062] To facilitate the installation of the battery cell 2 and the base plate 101, and to limit the connection of the heating element 3, the base plate 101 is provided with a heating element mounting groove. The heating element 3 is installed in the heating element mounting groove, which is arranged according to the orientation of the heating element 3. To avoid the heating element mounting groove being too deep and affecting the structural strength of the base plate 101, a portion of the heating element 3 protrudes from the heating element mounting groove, such as... Figure 4 and Figure 7 As shown.

[0063] The battery pack of this invention reduces the impact of the heating element 3 in two adjacent battery compartments passing through the intermediate beam 4 on the structural strength of the intermediate beam 4, improves the heating efficiency of the battery cell 2, and reduces the heat carried away by the intermediate beam 4.

[0064] This utility model also provides an electrical device, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0065] In the description of this solution, it should be understood that 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 solution, "multiple" means two or more, unless otherwise explicitly specified.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, The device includes a housing and multiple battery cells. The housing includes a base plate and a frame connected to the surface of the base plate. The base plate and the frame form a cavity for housing the battery cells. The cavity is divided into at least two battery compartments by a central beam. A heating element is disposed on the base plate, and the battery cells are placed on the base plate. The heating element is located between the base plate and the battery cells. The central beam has a connecting opening that connects two adjacent battery compartments. A portion of the heating element passes through the connecting opening. The connecting opening is cut along the length of the central beam in a first direction, and its cross-sectional area is A1 mm. 2 The cross-sectional area of ​​the intermediate beam is A2 mm. 2 The range of A1 / A2 is 0.0018-0.

02.

2. The battery pack according to claim 1, characterized in that, The connecting opening is located on the intermediate beam near the bottom plate.

3. The battery pack according to claim 1 or 2, characterized in that, The center line of the connecting opening is perpendicular to the surface of the intermediate beam in which the connecting opening is located.

4. The battery pack according to claim 1, characterized in that, A1 mm 2 The range is 30 mm 2 -150mm 2 ; And / or, A2 mm 2 The range is 7500 mm 2 -16800mm 2 .

5. The battery pack according to claim 1, characterized in that, The heating element is spaced apart from the wall of the connecting opening, and the distance between the tube wall of the heating element and the wall of the connecting opening is L1mm, with L1mm ranging from 2mm to 10mm.

6. The battery pack according to claim 1, characterized in that, The connecting opening is a round hole, a trapezoidal hole, or a rectangular hole.

7. The battery pack according to claim 1, characterized in that, The connecting opening is an isosceles trapezoidal hole located on the intermediate beam near the bottom plate, with the short side of the isosceles trapezoidal hole located away from the bottom plate.

8. The battery pack according to claim 1, characterized in that, The distance between the connecting opening and the surface of the intermediate beam away from the bottom plate is L2mm, and the range of L2mm is 65mm-110mm.

9. The battery pack according to claim 1, characterized in that, At least one of the connecting openings is provided on the intermediate beam; The two ends of the intermediate beam are connected to the frame, and the distance between the connecting opening and the end of the intermediate beam near the frame is L3mm, where L3mm ranges from 30mm to 200mm.

10. The battery pack according to claim 1, characterized in that, The heating element is one of a heating tube, a heating wire, a heating film, or a heating plate.

11. The battery pack according to claim 10, characterized in that, The heating element is a heating tube; The heating tube includes a main heating tube and an end connecting tube connected together. The main heating tube extends perpendicularly to the intermediate beam and passes through the connecting opening. Adjacent main heating tubes are connected through the end connecting tube.

12. The battery pack according to claim 11, characterized in that, The end connecting pipe is arranged parallel to the intermediate beam.

13. The battery pack according to claim 12, characterized in that, The distance between the end connecting pipe and the intermediate beam is L4mm, and the range of L4mm is 200mm-900mm.

14. The battery pack according to claim 11, characterized in that, The frame includes a first frame plate and a second frame plate connected together. The first frame plate is arranged perpendicular to the middle beam, and the second frame plate is arranged parallel to the middle beam. The distance between the heating main pipe and the first frame plate is L5mm, and the range of L5mm is 32mm-205mm.

15. The battery pack according to claim 14, characterized in that, The spacing between adjacent heating main tubes is L6mm, and L6mm ranges from 20mm to 200mm.

16. The battery pack according to claim 1, characterized in that, A heat insulation sleeve is provided inside the connecting opening, and the heat insulation sleeve is provided with a mounting through hole connecting two adjacent battery compartments. The heating element passes through the mounting through hole.

17. The battery pack according to claim 16, characterized in that, The outer surface of the heat insulation sleeve is in close contact with or fixedly connected to the surface of the through hole.

18. The battery pack according to claim 11, characterized in that, The heating tubes are arranged in an S-shape on the base plate.

19. The battery pack according to claim 11, characterized in that, The heating element has a circular, rectangular, or square cross-section.

20. The battery pack according to claim 1, characterized in that, Multiple intermediate beams are provided, and the multiple intermediate beams are arranged at intervals in the second direction. The connecting openings on two adjacent intermediate beams are arranged opposite each other; or the connecting openings on two adjacent intermediate beams are staggered.

21. The battery pack according to claim 1, characterized in that, The base plate is provided with a heating element mounting groove, and the heating element is installed in the heating element mounting groove.

22. The battery pack according to claim 21, characterized in that, Along the height direction, the heating element portion protrudes from the heating element mounting groove.

23. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1-22.

Images