Battery pack and electric device with same

Abstract

The invention provides a battery pack and a power utilization device with the same, and the battery pack comprises a box body which is provided with a containing cavity; the partition beams are arranged in the box body and divide the accommodating cavity into a plurality of sub-cavities, and a battery pack is arranged in each sub-cavity; the box cover is arranged above the box body in a covering mode and blocks the containing cavity; the sealing piece is arranged between the separation beam and the box cover and is used for separating the two adjacent sub-cavities; wherein the battery pack comprises a battery body, a pole and a conducting bar, a first spacing distance A mm is formed between the top surface of the separation beam and the top surface of the battery body, the sealing element has a thickness T0 mm before compression and a thickness T1 mm after compression, a second spacing distance B mm is formed between the top surface of the conducting bar and the top surface of the battery body, and 40 < = A * (T0-T1) * B < = 320. According to the technical scheme, the problem that the connection strength between the conducting bar and the pole is affected due to the fact that the separation beam is prone to deformation in the prior art can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery pack and an electrical device having the same. Background Technology

[0002] In related technologies, multiple sub-chambers are divided into the battery pack housing by a partition beam, and each sub-chamber is independently sealed. When the battery pack in one sub-chamber fails due to thermal runaway or other reasons, the battery packs in the other sub-chambers can still work normally.

[0003] Among them, the separator beam is generally taller than the original horizontal and vertical beam structure used to reinforce the battery pack. The separator beam is more prone to deformation than the original horizontal and vertical beam structure. In addition, the separator beam needs to abut against the box cover. Vibration at the box cover will be transmitted to the separator beam, which may cause the separator beam to deform and affect the connection strength between the conductive bar and the terminal post in the battery pack. Summary of the Invention

[0004] The main objective of this invention is to provide a battery pack and an electrical device having the same, in order to solve the problem in related technologies where the separator beam is prone to deformation, which affects the connection strength between the conductive bar and the terminal post.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing having a receiving cavity; a partition beam disposed within the housing and dividing the receiving cavity into multiple sub-chambers, each sub-chamber containing a battery pack; a cover covering the housing and sealing the receiving cavity; and a sealing member disposed between the partition beam and the cover and isolating two adjacent sub-chambers; wherein the battery pack includes a battery body, terminals, and a conductive busbar, the terminals being disposed on the top surface of the battery body, the conductive busbar being disposed above the terminals and electrically connected to the terminals, the top surface of the partition beam being higher than the top surface of the battery body, and a first gap distance A mm between the top surface of the partition beam and the top surface of the battery body, the sealing member having a thickness T0 mm before compression and a thickness T1 mm after compression, and a second gap distance B mm between the top surface of the conductive busbar and the top surface of the battery body, wherein the first gap distance A mm, the thickness T0 mm before compression, the thickness T1 mm after compression, and the second gap distance B mm satisfy: 40 ≤ A × (T0 - T1) × B ≤ 320.

[0006] According to another aspect of the present invention, an electrical device is provided, comprising a battery pack, wherein the battery pack is the battery pack described above.

[0007] By applying the technical solution of this invention, the housing cavity of the casing is divided into multiple sub-chambers by a partition beam, and a sealing element is installed between the partition beam and the casing cover. This achieves sealing and isolation of adjacent sub-chambers, ensuring that when a battery pack in one sub-chamber fails due to thermal runaway or other reasons, the thermal runaway can be controlled within that sub-chamber, preventing hot gas from flowing into other sub-chambers and affecting the normal operation of the battery packs there, thus allowing the battery pack to continue operating. By ensuring that the first gap distance A mm between the top surface of the partition beam and the top surface of the battery body, the uncompressed thickness T0 mm, the compressed thickness T1 mm, and the second gap distance B mm between the top surface of the conductive bar and the top surface of the battery body meet the above requirements, the impact of partition beam deformation on the connection strength between the conductive bar and the terminal post can be reduced while maintaining the sealing and isolation effect of adjacent sub-chambers. Specifically, the first spacing distance A mm reflects the height of the separator beam. A larger first spacing distance A mm indicates a larger separator beam, meaning it is more prone to deformation, affecting the connection strength between the conductor and the terminal. Conversely, a smaller first spacing distance A mm indicates a smaller separator beam, meaning it is less prone to deformation, thus affecting the connection strength between the conductor and the terminal. The difference between the thickness T0 mm before compression and the thickness T1 mm after compression reflects the degree of compression of the seal. A larger difference indicates a greater degree of compression and better sealing, but the seal's cushioning capacity weakens, making it easier for vibrations at the cover to be transmitted to the separator beam, causing deformation. Conversely, a smaller difference indicates a less compressed seal and poorer sealing, but the seal's cushioning capacity is stronger, making it less likely for vibrations at the cover to be transmitted to the separator beam, thus preventing deformation. The second spacing distance B mm reflects the distance between the connection point of the terminal and the conductor and the top surface of the battery body. A larger mm indicates a greater distance between the terminal and the conductor bar from the top surface of the battery body, making the connection more prone to failure. Conversely, a smaller second spacing distance B mm indicates a closer distance between the terminal and the conductor bar from the top surface of the battery body, resulting in a more robust connection. By comprehensively considering the product of the first spacing distance A mm, the difference between the pre-compression thickness T0 mm and the post-compression thickness T1 mm, and the second spacing distance B mm, this approach not only considers the independent effects of these three parameters on the sealing and isolation between adjacent sub-chambers and the connection strength between the conductor bar and the terminal, but also the mutual influence between them. This achieves a reduction in the impact of separator beam deformation on the connection strength between the conductor bar and the terminal while ensuring the sealing and isolation effect between adjacent sub-chambers. Therefore, the technical solution of this application effectively solves the problem in related technologies where separator beams are prone to deformation, affecting the connection strength between the conductor bar and the terminal. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0009] Figure 1 A three-dimensional structural schematic diagram of an embodiment of a battery pack according to the present invention is shown;

[0010] Figure 2 It shows Figure 1 A three-dimensional structural diagram of part of the battery pack;

[0011] Figure 3 It shows Figure 1 A cross-sectional view of the battery pack;

[0012] Figure 4 It shows Figure 3 A magnified view of point A on the battery pack;

[0013] Figure 5 It shows Figure 4 A magnified view of point B on the battery pack;

[0014] Figure 6 A cross-sectional schematic diagram of an embodiment of a battery pack according to the present invention is shown;

[0015] Figure 7 It shows Figure 6 A magnified view of point C on the battery pack;

[0016] Figure 8 It shows Figure 6 A three-dimensional structural diagram of the battery body of the battery pack;

[0017] Figure 9 It shows Figure 8 A cross-sectional schematic diagram of the battery body;

[0018] Figure 10 A three-dimensional structural schematic diagram of a separator beam according to an embodiment of a battery pack based on the present invention is shown;

[0019] Figure 11 A three-dimensional structural schematic diagram of a separator beam according to an embodiment of a battery pack based on the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. Box body; 101. Receiving cavity; 102. Sub-chamber; 11. Side beam;

[0022] 20. Divider beam; 21. Divider rib; 22. Open structure; 23. Glue injection hole; 24. First fixing hole; 25. Second fixing hole;

[0023] 30. Battery pack; 301. First battery pack; 302. Second battery pack; 31. Battery body; 311. Battery casing; 312. Battery cell; 313. Tab; 314. First explosion-proof valve; 32. Terminal post; 33. Conductor busbar; 34. Insulating film; 341. Window opening;

[0024] 40. Box lid;

[0025] 50. Sealing components;

[0026] 60. Separator; 61. Buffer recess;

[0027] 80. Buffer sealing structure;

[0028] 100. Second explosion-proof valve. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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 invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] 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.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the 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 figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] The concepts involved in the embodiments of this application are explained below:

[0033] 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 a reasonable structural design, fixes these components within the enclosure, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The enclosure consists of a lower enclosure and an upper enclosure. The lower enclosure includes a base plate and side plates connected to and surrounding the base plate; the upper enclosure is connected to the side plates and has a cover plate (also called a cover) positioned opposite the base plate. The upper and lower enclosures together form a receiving cavity. The enclosure can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0034] The frame is the structural framework of the battery pack housing, serving a supporting, protective, and connecting function. The frame can be composed of various elements; for example, it can be formed by splicing together multiple beams; or it can consist of four sub-frames connected end-to-end to form an enclosed space, which is then sealed by a cover and a bottom plate to create a cavity. The frame can be made of various materials, such as aluminum alloy, copper alloy, steel, or plastic; it can be rectangular, circular, polygonal, etc., and this application does not specify a particular shape. The interior of the frame can be a solid structure or contain cavities.

[0035] A partition beam is disposed within the housing cavity of the battery pack and extends laterally or longitudinally to divide the housing space into multiple sub-chambers. Each sub-chamber houses at least one battery pack. The partition beam can be a strip structure, with its two ends connected to two side beams of the housing along its length, thus dividing the housing into two sub-chambers located on either side of the partition beam along its width. The partition beam can be made of metal, such as aluminum, or integrally molded using rubber injection molding, plastic injection molding, or molding molding. Plastic injection molding can use plastics such as polyethylene, polypropylene, ABS, PA, or polystyrene. The partition beam can also be formed by die casting or other methods such as extrusion molding, and then welded to the housing.

[0036] A battery pack is formed by connecting multiple battery cells with similar capacity and internal resistance in series or parallel.

[0037] A battery casing is a component used to provide a space to house and isolate the electrode assembly and other parts of a battery cell from the external environment. A battery casing generally includes a casing body with an opening at at least one end and a receiving cavity. The opening of the battery casing can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Materials used for battery casings include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic composite film.

[0038] The cover plate is a component that seals the opening of the battery casing to isolate the internal environment of the battery cell from the external environment. Materials used for the cover plate include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film.

[0039] A battery cell is the component in a battery where electrochemical reactions occur; it is the smallest unit in a battery capable of performing electrochemical reactions such as charging and discharging. A battery cell is the basic unit of a battery and typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the movement of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0040] The tab is located on one side of the positive / negative current collector and is separately or integrally formed with the current collector. It is electrically connected to the current collector to conduct the current on the corresponding current collector. The tab is made of a metal material with good conductivity (such as copper, aluminum, or nickel).

[0041] An explosion-proof valve on a battery cell is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. During battery use, the explosion-proof valve is mainly used to prevent excessive pressure buildup that could cause deformation or explosion in the event of thermal runaway or other situations. It allows gas to escape from the battery, thus reducing internal pressure. The material of the explosion-proof valve is not limited, including but not limited to aluminum, steel, and alloys. The shape of the explosion-proof valve is not limited, and it can be square, oblong, elliptical, racetrack-shaped, etc. The type of explosion-proof valve is not limited, such as a notched explosion-proof valve, which can be formed by stamping or laser etching.

[0042] Terminals are used to electrically connect the electrode assembly inside a battery cell to external devices (adjacent battery cells or other electrical equipment) located outside the battery casing. The battery can discharge to external devices through the cell output terminals (tabs) and the external device output terminals (terminals), and an external power source can charge the battery through the terminals and tabs. Terminals can be directly electrically connected to the cell tabs or connected to the tabs through metal adapters. Terminals are made of metals including, but not limited to, copper, aluminum, aluminum alloys, and copper-aluminum alloys.

[0043] A busbar electrically connects the terminals (current output terminals) of at least two battery cells to enable series or parallel connection of multiple battery cells. Busbars are made of metals such as copper, aluminum, tungsten, and manganese, or alloys such as copper-aluminum composites, which possess excellent electrical conductivity.

[0044] An insulating film is applied to the outer surface of the battery's metal casing to improve the insulation performance of the battery's outer surface. It can be applied to the outer surface of the casing by adhesive bonding or coating. The insulating film can be a film structure such as polyester film (PET, Polyethylene Terephthalate), polyimide (PI), polypropylene (PP), or polyethylene (PE).

[0045] The components of the insulating coating can be: (1) modified epoxy resin; (2) polyacrylate; (3) polyethylene phthalate (PET); (4) insulating material formed by oil-based insulating resin or water-based insulating resin as the main material, the main material of the insulating resin includes epoxy resin, acrylic resin, polyurethane resin, hydroxyl acrylic resin and other multifunctional resins; the insulating material can also include a variety of additives, such as photoinitiators, reactive diluents, flame retardants, wetting agents, leveling agents, defoamers, etc. The main material and additives are mixed in a certain proportion to prepare the insulating material for spraying. It is understandable that in order to avoid the material from flowing too quickly when sprayed onto the surface of the shell, the spraying material is prepared as a liquid with a certain viscosity, the viscosity range is mainly between 2000 and 12000 cps, and the specific viscosity range of different materials is adjusted accordingly; (5) polyimide coating or insulating coating formed by polymers such as polyimide (PI) and epoxy resin; (6) styrene-butadiene rubber emulsion.

[0046] Other types of outer insulation layers: Alumina layer, boron nitride layer, or titanium carbide layer can also be used to replace the blue film. Layers made of the above materials have insulation properties and high temperature resistance.

[0047] The cover is a sealed component used to enclose the housing cavity of the battery pack, isolating it from the outside environment and preventing external moisture and dust from affecting the battery pack. The cover can be made of non-metallic materials, such as any polymer compound used as a raw material in plastics processing, commonly known as resin. Common resins include polyphenylene sulfide resin (PPS), polyphenylene oxide resin (PPO), and polypropylene resin (PP). Alternatively, composite materials including reinforcing agents and resin can be used; common reinforcing agents include glass fiber, carbon fiber, and graphite fiber. Metallic materials such as iron, aluminum, aluminum alloys, iron alloys, and stainless steel can also be used.

[0048] A separator is disposed on at least one side of the battery pack formed by the multiple battery cells along the stacking direction of the cells. It counteracts the expansion and deformation forces of the individual cells, preventing the overall size of the battery pack from increasing. The separator can be made of aluminum, steel, other metal materials, or composite materials of metal and non-metal; it can be made of engineering plastics, fiberglass, or carbon fiber; and it can be made from aluminum alloy sheet through extrusion and / or machine tool processing. The separator can also be a flat plate structure with a certain thickness, typically 2mm to 25mm, to meet the strength requirements of the battery pack. A thinner thickness would not meet the structural strength requirements; a thicker thickness would affect the energy density of the battery pack.

[0049] An explosion-proof valve in a battery pack enclosure is a component that actuates to release internal pressure or temperature when the internal pressure or temperature reaches a predetermined threshold. The explosion-proof valve is used to prevent the risk of explosion caused by abnormal conditions such as battery overheating or overcharging, ensuring the safe operation of the battery. When the battery is operating normally, the explosion-proof valve seals the enclosure to ensure normal battery operation; in the event of thermal runaway, the explosion-proof valve needs to activate its explosion-proof function promptly to release internal gas and heat, thereby reducing the risk of explosion. The working principle of the explosion-proof valve is to establish a regulating venting channel inside the enclosure. When the internal pressure of the enclosure increases, the valve opens, allowing gas to escape from the enclosure and thus reducing pressure. The explosion-proof valve may include a housing, a valve cover, and a hinge structure. The explosion-proof valve can be made of metal or flame-retardant polymer materials such as polyvinyl chloride, polyvinylidene chloride, and fluoroplastics.

[0050] like Figures 1 to 5 As shown, this application provides a battery pack, an embodiment of which includes: a housing 10, a partition beam 20, a battery pack 30, a housing cover 40, and a sealing element 50. The housing 10 has a receiving cavity 101; a partition beam 20 is disposed inside the housing 10 and divides the receiving cavity 101 into multiple sub-chambers 102, each sub-chamber 102 containing a battery pack 30; a cover 40 is placed on top of the housing 10 and seals the receiving cavity 101; a sealing element 50 is disposed between the partition beam 20 and the cover 40 and isolates two adjacent sub-chambers 102; wherein, the battery pack 30 includes a battery body 31, terminals 32, and conductive busbars 33, the terminals 32 are disposed on the top surface of the battery body 31, the conductive busbars 33 are disposed above the terminals 32 and electrically connected to the terminals 32, the top surface of the partition beam 20 is higher than the top surface of the battery body 31, and there is a first gap distance A mm between the top surface of the partition beam 20 and the top surface of the battery body 31, the sealing element 50 has a thickness T0 mm before compression and a thickness T1 mm after compression, and there is a second gap distance B mm between the top surface of the conductive busbars 33 and the top surface of the battery body 31, wherein the first gap distance A The following conditions must be met: the thickness before compression (T0 mm), the thickness after compression (T1 mm), and the second interval (B mm) must satisfy: 40 ≤ A × (T0 - T1) × B ≤ 320.

[0051] By applying the technical solution of this embodiment, the housing cavity 101 of the box 10 is divided into multiple sub-chambers 102 by the partition beam 20, and a sealing element 50 is provided between the partition beam 20 and the box cover 40. This can achieve sealing and isolation of adjacent sub-chambers 102, so that when the battery pack 30 in a certain sub-chamber 102 fails due to thermal runaway or other reasons, the thermal runaway can be controlled within that sub-chamber 102, preventing hot gas from flowing into other sub-chambers 102 and affecting the normal operation of the battery pack 30 in other sub-chambers 102, thereby allowing the battery pack to continue to work. By ensuring that the first gap distance A mm between the top surface of the separator beam 20 and the top surface of the battery body 31, the thickness T0 mm before compression of the seal 50, the thickness T1 mm after compression, and the second gap distance B mm between the top surface of the conductive bar 33 and the top surface of the battery body 31 meet the above requirements, the deformation of the separator beam 20 can be reduced on the connection strength between the conductive bar 33 and the terminal post 32 while ensuring the sealing and isolation effect of the adjacent sub-chambers 102. Specifically, the first interval distance A mm reflects the height of the partition beam 20. The larger the first interval distance A mm, the greater the height of the partition beam 20, meaning the partition beam 20 is more prone to deformation, affecting the connection strength between the conductive busbar 33 and the pole post 32. Conversely, the smaller the first interval distance A mm, the smaller the height of the partition beam 20, meaning the partition beam 20 is less prone to deformation, thus affecting the connection strength between the conductive busbar 33 and the pole post 32. The difference between the thickness T0 mm before compression and the thickness T1 mm after compression reflects the degree of compression of the seal 50. The larger the difference, the greater the degree of compression of the seal 50, resulting in a better sealing effect. However, the cushioning capacity of the seal 50 will be weaker, making it easier for vibrations at the cover 40 to be transmitted to the partition beam 20, causing deformation of the partition beam 20. Conversely, the smaller the difference, the less the degree of compression of the seal 50, resulting in a poorer sealing effect. However, the stronger the cushioning capacity of the seal 50, making it less likely for vibrations at the cover 40 to be transmitted to the partition beam 20, thus preventing deformation of the partition beam 20. The second interval distance B... mm reflects the distance between the connection position of the terminal post 32 and the conductive bus 33 and the top surface of the battery body 31. The larger the second distance B mm, the farther the connection position of the terminal post 32 and the conductive bus 33 is from the top surface of the battery body 31, and the more likely the connection between the two will fail. Conversely, the smaller the second distance B mm, the closer the connection position of the terminal post 32 and the conductive bus 33 is to the top surface of the battery body 31, and the more reliable the connection between the two.By comprehensively considering the product of the difference between the first spacing distance A mm, the thickness T0 mm before compression, and the thickness T1 mm after compression, and the second spacing distance B mm, this approach not only considers the independent influence of each of the three parameters on the sealing and isolation between adjacent sub-chambers 102 and the connection strength between the conductive busbar 33 and the pole post 32, but also takes into account the mutual influence between the three parameters. This achieves a reduction in the impact of the deformation of the partition beam 20 on the connection strength between the conductive busbar 33 and the pole post 32 while ensuring the sealing and isolation effect of adjacent sub-chambers 102. Therefore, the technical solution of this embodiment can effectively solve the problem in related technologies where the partition beam is prone to deformation, affecting the connection strength between the conductive busbar and the pole post.

[0052] Preferably, A×(T0-T1)×B can be 40, 50, 60, 80, 100, 150, 200, 300, 310 or 320.

[0053] like Figure 5 As shown, the first interval distance A mm satisfies: 5mm ≤ A mm ≤ 10mm. The first interval distance A mm reflects the height of the partition beam 20. The larger the first interval distance A mm, the larger the height of the partition beam 20, meaning the partition beam 20 is more prone to deformation, affecting the connection strength between the conductive busbar 33 and the pole post 32. Conversely, the smaller the first interval distance A mm, the smaller the height of the partition beam 20, meaning the partition beam 20 is less prone to deformation, thus affecting the connection strength between the conductive busbar 33 and the pole post 32. Furthermore, the smaller the first interval distance A mm, the larger the distance between the top surface of the partition beam 20 and the box cover 40, requiring a greater sealing height and a higher risk of seal failure. Conversely, the larger the first interval distance A mm, the smaller the distance between the top surface of the partition beam 20 and the box cover 40, requiring a smaller sealing height and a lower risk of seal failure. By controlling the first interval distance A mm within the aforementioned range, both the sealing and isolation effect between adjacent sub-chambers 102 and the connection strength between the conductive busbar 33 and the pole post 32 can be considered. Preferably, the first interval distance A mm can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0054] In general, in order to maximize the space of the passenger compartment in a vehicle with a battery pack, the cover 40 will directly abut against the bottom wall of the passenger compartment, or even use the cover 40 as the bottom wall of the passenger compartment. Therefore, the cover 40 will be affected by the passenger compartment and will vibrate significantly. The vibration of the cover 40 will be transmitted to the partition beam 20 through the seal 50, affecting the structural strength and deformation of the partition beam 20.

[0055] like Figures 3 to 5As shown, the thickness T0 mm before compression and the thickness T1 mm after compression satisfy the following condition: 1.2 mm ≤ T0 mm - T1 mm ≤ 5 mm. The difference between the thickness T0 mm before compression and the thickness T1 mm after compression reflects the degree of compression of the seal 50. The larger the difference, the greater the degree of compression of the seal 50, resulting in a better sealing effect. However, the weaker the buffering capacity of the seal 50, the easier it is for vibrations at the cover 40 to be transmitted to the partition beam 20, causing deformation of the partition beam 20. Conversely, the smaller the difference, the smaller the degree of compression of the seal 50, resulting in a poorer sealing effect. However, the stronger the buffering capacity of the seal 50, the less likely vibrations at the cover 40 are to be transmitted to the partition beam 20, thus preventing deformation of the partition beam 20. By controlling the difference between the thickness T0 mm before compression and the thickness T1 mm after compression within the above range, the sealing and isolation effect between adjacent sub-chambers 102 can be balanced with the minimal impact of vibrations from the cover 40 on the partition beam 20. Preferably, T0 mm-T1 mm can be 1.2 mm, 1.5 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0056] like Figure 5 As shown, the second spacing distance B mm satisfies: 4mm ≤ B mm ≤ 7mm. The second spacing distance B mm reflects the distance between the connection position of the terminal post 32 and the conductive busbar 33 and the top surface of the battery body 31. The larger the second spacing distance B mm, the farther the connection position of the terminal post 32 and the conductive busbar 33 is from the top surface of the battery body 31, and the closer the conductive busbar 33 is to the cover 40. The connection between the terminal post 32 and the conductive busbar 33 is more prone to failure, and the cover 40 is more likely to hit the conductive busbar 33 when it deforms, thus affecting the reliability of the connection between the terminal post 32 and the conductive busbar 33. Conversely, the smaller the second spacing distance B mm, the closer the connection position of the terminal post 32 and the conductive busbar 33 is from the top surface of the battery body 31, and the farther the conductive busbar 33 is from the cover 40. The connection between the terminal post 32 and the conductive busbar 33 is more reliable, and the cover 40 is less likely to hit the conductive busbar 33 when it deforms, thus affecting the reliability of the connection between the terminal post 32 and the conductive busbar 33. In addition, the second spacing distance B mm The larger the second gap distance B mm, the longer the heat transfer path and the larger the heat dissipation area between the battery cell 312 and the conductive busbar 33 in the battery body 31, making the battery pack 30 less prone to thermal runaway. Conversely, the smaller the second gap distance B mm, the shorter the heat transfer path and the smaller the heat dissipation area between the battery cell 312 and the conductive busbar 33 in the battery body 31, increasing the risk of thermal runaway in the battery pack 30. By controlling the second gap distance B mm within the above-mentioned range, both the connection strength between the terminal post 32 and the conductive busbar 33 and the heat dissipation effect between the battery cell 312 and the conductive busbar 33 can be considered. Preferably, the second gap distance B mm can be 4 mm, 5 mm, 6 mm, or 7 mm.

[0057] like Figure 4As shown, the separator beam 20 is spaced apart from at least one battery pack 30 and has a third spacing distance C mm in the lateral direction, which satisfies the following condition: 2 mm ≤ C mm ≤ 12 mm. By spacing the separator beam 20 from the battery pack 30, the possibility of the force after deformation of the separator beam 20 being transmitted to the battery pack 30 and affecting the connection between the terminal post 32 and the conductive bar 33 can be reduced. However, this will reduce the space utilization rate within the housing 10. By controlling the third spacing distance C mm within the above-mentioned range, both the isolation effect of deformation force and the space utilization rate within the housing 10 can be considered. Preferably, the third spacing distance C mm can be 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 11 mm, or 12 mm.

[0058] Of course, in order to improve the space utilization within the housing 10, the two battery packs 30 located on both sides of the partition beam 20 can also be fitted to the partition beam 20.

[0059] like Figures 6 to 7 As shown, a separator 60 is provided between the separator beam 20 and the spaced-apart battery pack 30. Two opposing sides of the separator 60 contact the separator beam 20 and the battery pack 30, respectively. The separator 60 has a first height H1 mm, and the battery body 31 has a second height H2 mm. The first height H1 mm and the second height H2 mm satisfy the condition: 0.65 ≤ H1 / H2 ≤ 1.2. The separator 60 enables positional constraint of the battery pack 30 and the separator beam 20 in the width direction of the separator beam 20, reducing the probability of the battery pack 30 shaking within the sub-chamber 102. By controlling the ratio of the first height H1 mm to the second height H2 mm within the aforementioned range, the positional constraint effect on the battery pack 30 can be guaranteed. Preferably, H1 / H2 can be 0.65, 0.7, 0.85, 1, 1.1, or 1.2.

[0060] like Figures 6 to 7 As shown, a buffer recess 61 is provided on the surface of the separator 60 facing the separator beam 20. The buffer recess 61 can reduce the weight of the separator 60, thereby reducing the overall weight of the battery pack; on the other hand, it can provide a certain amount of collapsing energy absorption space for the deformation of the separator beam 20, reducing the force transmitted to the battery pack 30 when the separator beam 20 deforms, thereby improving the structural strength of the battery pack 30 itself, especially improving the connection strength between the terminal post 32 and the conductive busbar 33; in addition, the buffer recess 61 can also strengthen the structure of the separator 60.

[0061] The buffer recess 61 can be provided with a flexible adhesive that can deform, which can increase the connection strength between the separator 60 and the separator beam 20 while ensuring its collapse energy absorption effect, so as to improve the positional constraint effect on the battery pack 30.

[0062] like Figures 6 to 7 As shown, there are multiple buffer recesses 61, wherein the uppermost buffer recess 61 has a fourth interval distance D mm between it and the cover 40, and the fourth interval distance D mm satisfies: D mm ≤ 50 mm. Preferably, the fourth interval distance D mm can be 15 mm, 20 mm, 30 mm, 40 mm or 50 mm.

[0063] like Figures 6 to 7 As shown, there are multiple buffer recesses 61, wherein the lowest buffer recess 61 has a fifth interval distance E mm between it and the bottom surface of the receiving cavity 101, and the fifth interval distance E mm satisfies: E mm ≤ 20. Preferably, the fifth interval distance E mm can be 5 mm, 10 mm, 15 mm or 20 mm.

[0064] In related technologies, the battery casing of the battery body is generally a conductive structure, and a complete insulating film structure is usually set on the outer periphery of the battery body to prevent arcing and conduction between the battery body and the external conductive junction. The insulating film structure is bonded to the external structure to secure the battery body. However, when the battery pack is subjected to a large impact, the insulating film structure may separate from the external structure or from the battery body, resulting in poor fixation of the battery body.

[0065] like Figures 6 to 9 As shown, an insulating film 34 is provided on the surface of the battery body 31. The insulating film 34 located on the surface of the battery body 31 facing the separator 60 has a window portion 341. An adhesive layer for connecting the battery body 31 and the separator 60 is provided in the window portion 341. The window portion 341 has a first surface area S1 mm. 2 The surface of the battery body 31 facing the separator 60 has a second surface area S2 mm. 2 The first surface area is S1 mm. 2 Second surface area S2 mm 2 The following condition must be met: 0.1 ≤ S1 / S2 ≤ 0.95. By providing a window 341 on the insulating film 34 and an adhesive layer within the window 341 to achieve a direct connection between the battery body 31 and the separator 60, the fixing effect of the battery body 31 and the battery pack 30 is better, thereby improving the structural strength of the battery pack. By increasing the first surface area S1 mm... 2 Second surface area S2 mm 2 The ratio between S1 and S2 is controlled within the above-mentioned range to balance the fixing effect on the battery body 31 and the battery pack 30 with the insulation effect of the insulating film 34. Preferably, S1 / S2 can be 0.1, 0.12, 0.15, 0.2, 0.4, 0.5, 0.6, 0.8, 0.9 or 0.95.

[0066] In a preferred embodiment, the second surface area is S2 mm. 2 In 8×10 3 mm 2 Up to 3.375×10 5 mm 2 Between; First surface area S1 mm 2 At 4.2×10 3 mm 2 Up to 1.78×10 5 mm 2 between.

[0067] like Figures 6 to 7 As shown, there is a sixth gap distance F mm between the window portion 341 and the top surface of the battery body 31. The sixth gap distance F mm satisfies: F mm ≤ 20 mm. Generally, the bottom of the battery body 31 is fixed to the bottom plate of the housing 10. The smaller the sixth gap distance F mm, the closer the top of the adhesive layer is to the top surface of the battery body 31, and the more likely the adhesive layer will fail. By controlling the sixth gap distance F mm within the above-mentioned range, the adhesive layer's bonding effect can be guaranteed. Preferably, the sixth gap distance F mm can be 5 mm, 8 mm, 10 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm.

[0068] like Figures 6 to 7 As shown, there is a seventh interval distance G mm between the window portion 341 and the bottom surface of the battery body 31, which satisfies the condition: G mm ≤ 20 mm. Since the bottom plate of the housing 10 is generally made of conductive material, the battery casing 311 of the battery body 31 will become slightly charged during the operation of the battery pack 30. By controlling the seventh interval distance G mm within the above-mentioned range, arcing between the battery casing 311 and the bottom plate of the housing 10 can be avoided, which could lead to a short circuit. Preferably, the seventh interval distance G mm can be 5 mm, 8 mm, 10 mm, 11 mm, 12 mm, 15 mm, 18 mm, or 20 mm.

[0069] like Figures 6 to 7As shown, there is an eighth interval distance H mm between the window opening 341 and the top surface of the partition beam 20, which satisfies the following condition: 3mm ≤ H mm ≤ 20mm. The bottom of the partition beam 20 is fixedly connected to the bottom plate of the box body 10, and the top of the partition beam 20 is connected to the box cover 40 through the sealing element 50. This makes the top of the partition beam 20 more susceptible to vibration and deformation. The smaller the eighth interval distance H mm, the closer the top of the adhesive layer is to the top surface of the partition beam 20, and the more likely the adhesive layer will fail. By controlling the eighth interval distance H mm within the above-mentioned range, the adhesive layer's bonding effect can be guaranteed. Preferably, the eighth interval distance H mm can be 3mm, 5mm, 8mm, 10mm, 15mm, or 20mm.

[0070] like Figures 4 to 5 As shown, a first battery pack 301 and a second battery pack 302 are respectively arranged on both sides of the partition beam 20. In the lateral direction, the partition beam 20 and the first battery pack 301 have a first lateral distance C1 mm, and the partition beam 20 and the second battery pack 302 have a second lateral distance C2 mm. The first lateral distance C1 mm and the second lateral distance C2 mm satisfy the condition that |C1 mm - C2 mm| ≤ 10 mm. By controlling the absolute value of the difference between the first lateral distance C1 mm and the second lateral distance C2 mm within the above range, the first battery pack 301 and the second battery pack 302 are arranged as symmetrically as possible with respect to the partition beam 20, thereby improving the overall consistency of the battery pack and enhancing its overall strength. Preferably, |C1 mm - C2 mm| can be 0 mm, 2 mm, 5 mm, 7 mm, or 10 mm.

[0071] like Figure 4 , Figure 5 , Figure 7 , Figure 10 and Figure 11 As shown, the partition beam 20 is a hollow beam, and at least one partition rib 21 extending in the transverse direction is provided inside the hollow beam. By making the partition beam 20 a hollow structure, the partition beam 20 itself has a certain buffering capacity, and is not easily deformed or damaged after being subjected to the vibration force transmitted by the box cover 40; the partition rib 21 can improve the structural strength of the partition beam 20.

[0072] In this embodiment, the partition rib 21 extends in the transverse direction. Of course, partition ribs 21 extending in the vertical direction can also be provided inside the hollow beam to further increase the structural strength of the partition beam 20.

[0073] like Figure 4 , Figure 5 and Figure 7As shown, in the vertical direction, the top surface of the battery body 31 is located between the top surface of the separator beam 20 and the uppermost separator rib 21. The separator rib 21 is located at the position with the greatest structural strength in the height direction of the separator beam 20. By placing this position below the top surface of the battery body 31, the top surface of the battery body 31 (here, the welding position between the casing and the cover plate of the battery body 31) and the connection position between the conductive bar 33 and the terminal post 32 can be located at the same height as the position with relatively weaker structural strength on the separator beam 20, thereby reducing the impact of the separator beam 20 on the structural strength of the battery body 31.

[0074] like Figure 4 As shown, there is a ninth interval distance 1 mm between the top surface of the battery body 31 and the uppermost partition rib 21. The ninth interval distance 1 mm satisfies the following condition: 3 mm ≤ 1 mm ≤ 15 mm. By controlling the ninth interval distance 1 mm within the above range, the spacing between the top surface of the battery body 31 and the partition rib 21 is reasonable, thereby reducing the impact of the partition rib 21 on the structural strength of the battery body 31. Preferably, the ninth interval distance 1 mm can be 3 mm, 5 mm, 7 mm, 10 mm, 12 mm, or 15 mm.

[0075] like Figures 4 to 5 As shown, the battery body 31 includes a battery casing 311 and a battery cell 312 disposed within the battery casing 311. The battery cell 312 has an upwardly extending tab 313. In the vertical direction, the tab 313 is offset from the separator rib 21. The offset arrangement of the tab 313 and the separator rib 21 means that their projections on the vertical surface of the separator beam 20 do not coincide. This arrangement can prevent the separator rib 21 from directly impacting the tab 313 when the separator beam 20 deforms, thus reducing the impact of vibration on the tab 313.

[0076] like Figure 4 As shown, at least two partition ribs 21 are provided inside the hollow beam, and there is a tenth interval distance J mm between two adjacent partition ribs 21. The tenth interval distance J mm satisfies: 5 mm ≤ J mm ≤ 30 mm. By controlling the tenth interval distance J mm within the above range, the height of each sub-cavity inside the hollow beam is reasonable, which can take into account both the buffering capacity of the partition beam 20 and the structural strength of the partition beam 20. Preferably, the tenth interval distance J mm can be 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm.

[0077] like Figure 4As shown, in the vertical direction, there is an eleventh interval distance K mm between the uppermost partition rib 21 and the sealing element 50. The eleventh interval distance K mm satisfies: 10 mm ≤ K mm ≤ 30 mm. By controlling the eleventh interval distance K mm within the above range, the spacing between the partition rib 21 and the top surface of the partition beam 20 is reasonable, which can take into account both the buffering capacity and the structural strength of the partition beam 20. Preferably, the eleventh interval distance K mm can be 10 mm, 13 mm, 15 mm, 20 mm, 25 mm or 30 mm.

[0078] like Figures 10 to 11 As shown, the partition beam 20 has opening structures 22 at both ends along its length, and a buffer sealing structure 80 is provided inside the partition beam 20 to block at least one opening structure 22. The partition beam 20 can be a profile structure manufactured by extrusion, and by providing a buffer sealing structure 80 inside the partition beam 20, the opening structure 22 can be blocked.

[0079] Specifically, a buffer sealing structure 80 can be injected into the interior of the partition beam 20 through the opening structure 22. The buffer sealing structure 80 can be made of expanding foam.

[0080] like Figure 10 As shown, a potting hole 23 is provided on the side of the separator beam 20 facing the battery pack 30. The potting hole 23 is used to inject the buffer sealing structure 80 into the separator beam 20. There is a twelfth interval distance L mm between the potting hole 23 and the preset center plane of the separator beam 20. The twelfth interval distance L mm satisfies: L mm ≤ 150 mm, and the preset center plane is the center plane perpendicular to the length direction of the separator beam 20. After the separator beam 20 has been installed on the housing 10, the opening structures 22 at both ends of the separator beam 20 have been connected to the side beams 11 of the housing 10, making it difficult to inject the buffer sealing structure 80 into the separator beam 20 through the opening structures 22. By providing the potting hole 23 on the side of the separator beam 20 facing the battery pack 30, the buffer sealing structure 80 can be smoothly injected into the interior of the separator beam 20. By controlling the twelfth interval distance L mm within the above range, the potting hole 23 can be located as close as possible to the center position in the length direction of the separator beam 20, thereby achieving more uniform injection. Preferably, the twelfth interval distance L mm can be 0 mm, 5 mm, 10 mm, 50 mm, 100 mm or 150 mm.

[0081] Specifically, for each of the multiple sub-cavities that the partition bar 21 divides into within the partition beam 20, a glue injection hole 23 can be provided.

[0082] like Figure 10As shown, the top surface of the partition beam 20 is provided with multiple first fixing holes 24. The battery pack also includes fasteners that pass through the cover 40, the seal 50, and the first fixing holes 24, so that the seal 50 is clamped between the partition beam 20 and the cover 40. By using fasteners that pass through the cover 40, the seal 50, and the first fixing holes 24 to press the seal 50 between the partition beam 20 and the cover 40 with a suitable amount of compression, it has the advantages of simple structure and reliable connection.

[0083] like Figure 10 As shown, along the length of the partition beam 20, there is a thirteenth interval M mm between two adjacent first fixing holes 24, and the thirteenth interval M mm satisfies: 15 mm ≤ M mm ≤ 150 mm. By controlling the thirteenth interval M mm within the above range, the density of the first fixing holes 24 on the partition beam 20 can be controlled. On the one hand, this reduces the impact of the arrangement of the first fixing holes 24 on the strength of the partition beam 20, and on the other hand, it ensures that the compression amount at various points along the length of the sealing element 50 is approximately equal, thereby ensuring the sealing effect. Preferably, the thirteenth interval M mm can be 15 mm, 20 mm, 40 mm, 60 mm, 100 mm, 120 mm, or 150 mm.

[0084] In an embodiment not shown in the figure, two adjacent first fixing holes 24 along the length of the partition beam 20 are at least partially offset along the width of the partition beam 20. This arrangement allows the first fixing holes 24 of the partition beam 20 to be staggered as much as possible, thereby better dispersing stress, avoiding stress concentration that could cause structural failure of the partition beam 20, and reducing the impact of the arrangement of the first fixing holes 24 on the strength of the partition beam 20.

[0085] There is a fourteenth interval distance N mm between the first fixing hole 24 and the side of the sealing element 50, and the fourteenth interval distance N mm satisfies: 2mm ≤ N mm ≤ 8mm. Controlling the fourteenth interval distance N mm within the above range can ensure the sealing effect of the sealing element 50 while reducing the lateral space occupied by the sealing element 50 within the housing 10, thereby improving the space utilization rate of the housing 10. Preferably, the fourteenth interval distance N mm can be 2mm, 5mm, or 8mm.

[0086] like Figure 11 As shown, two rows of second fixing holes 25 are provided on the top surface of the partition beam 20. The two rows of second fixing holes 25 and the fasteners passing through the two rows of second fixing holes 25 respectively seal the two adjacent sub-chambers 102. When the seal of one sub-chamber 102 fails, it will not affect the seal of the other sub-chamber 102.

[0087] like Figures 4 to 5As shown, the seal 50 has a first width W1 mm, and the partition beam 20 has a second width W2 mm. The ratio between the first width W1 mm ​​and the second width W2 mm satisfies the condition: 0.8 ≤ W1 / W2 ≤ 1.2. By controlling the ratio between the first width W1 mm ​​and the second width W2 mm within the above range, the width of the partition beam 20 can be reduced while ensuring that the seal 50 has sufficient width. This allows for more space inside the housing 10 for placing batteries, thereby increasing the energy density of the battery pack. Preferably, W1 / W2 can be 0.8, 0.85, 0.9, 1, or 1.2.

[0088] like Figures 1 to 2 As shown, the housing 10 has a side beam 11, and the two ends of the partition beam 20 are connected to the side beam 11. The end of the sealing member 50 extends above the side beam 11. By extending the sealing member 50 above the side beam 11, air leakage at the corner of the sub-chamber 102 can be prevented from causing communication between adjacent sub-chambers 102, thus ensuring a sealing and isolation effect.

[0089] In an embodiment not shown in the figure, the cover 40 has a first region corresponding to the partition beam 20 and a second region corresponding to the sub-chamber 102, with the first region being lower than the second region. By raising the second region corresponding to the sub-chamber 102, the cover 40 is spaced apart from the top of the battery pack 30, especially from the conductive bar 33, making it less likely to affect the connection between the conductive bar 33 and the terminal post 32 when the cover 40 vibrates or deforms. Furthermore, by creating a height difference between the first and second regions, the cover 40 forms a non-planar structure, which helps to improve the structural strength of the cover 40. In addition, since the first region is lower, the second region can shield the fasteners provided in the first region.

[0090] The width of the first region is greater than or equal to the width of the seal 50. This arrangement prevents parts of the seal 50 from being partially sandwiched between the cover 40 and the partition beam 20, thus ensuring a proper seal. The fact that the width of the first region is greater than or equal to the width of the seal 50 ensures that the entire structure of the seal 50 in the width direction can be used to achieve a seal, thereby guaranteeing the sealing effect.

[0091] Of course, the second zone can also be lower than the first zone.

[0092] In one embodiment, the battery body 31 has a first side, a second side, a third side, and a fourth side connected in sequence. The first side and the third side are arranged opposite each other, and the second side and the fourth side are arranged opposite each other. The area of ​​the first side is smaller than the area of ​​the second side. The first side is arranged opposite to the partition beam 20. The first spacing distance A mm, the thickness before compression T0 mm, the thickness after compression T1 mm, and the second spacing distance B mm satisfy: 50 ≤ A × (T0 - T1) × B ≤ 320. The battery body 31 expands during operation. Since the area of ​​the first side is smaller than the area of ​​the second side, the expansion deformation of the first side is relatively small when the battery body 31 expands. Consequently, the expansion of the battery body 31 has a relatively small impact on the structural strength of the partition beam 20. Therefore, the lower limit of A × (T0 - T1) × B can be increased to improve the sealing and isolation effect on the adjacent sub-chambers 102. At this time, A × (T0 - T1) × B can be 50, 60, 80, 100, 150, 200, 300, 310, or 320.

[0093] like Figure 1 , Figure 2 and Figure 8 As shown, the battery body 31 has a first side, a second side, a third side, and a fourth side connected in sequence. The first side and the third side are arranged opposite each other, and the second side and the fourth side are arranged opposite each other. The area of ​​the first side is smaller than the area of ​​the second side. The second side is arranged opposite to the partition beam 20. The first spacing distance A mm, the thickness before compression T0 mm, the thickness after compression T1 mm, and the second spacing distance B mm satisfy: 40 ≤ A × (T0 - T1) × B ≤ 310. The battery body 31 expands during operation. Since the area of ​​the first side is smaller than the area of ​​the second side, the expansion deformation of the second side is relatively larger when the battery body 31 expands. Consequently, the expansion of the battery body 31 has a relatively larger impact on the structural strength of the partition beam 20. Therefore, it is necessary to reduce the upper limit of A × (T0 - T1) × B to improve the structural strength of the partition beam 20 itself. At this time, A × (T0 - T1) × B can be 40, 50, 60, 80, 100, 150, 200, 300, or 310.

[0094] like Figures 8 to 9 As shown, the battery body 31 has a first explosion-proof valve 314, which is disposed on the bottom surface of the battery body 31. When the internal temperature of the battery body 31 is too high, resulting in excessive internal gas pressure, the high-temperature gas can be discharged by breaking the first explosion-proof valve 314. By placing the first explosion-proof valve 314 on the bottom surface of the battery body 31, and positioning the first explosion-proof valve 314 and the conductive busbar 33 on two opposite sides of the battery body 31, the impact of the first explosion-proof valve 314 breaking on the conductive busbar 33 can be reduced, thus achieving thermoelectric separation.

[0095] like Figures 1 to 2 As shown, the battery pack also includes a second explosion-proof valve 100 disposed on the housing 10. The second explosion-proof valve 100 and the sealing element 50 have a vertical distance V mm, which satisfies: 10 ≤ V mm. When thermal runaway occurs in a sub-chamber 102, high-temperature gas can be discharged through the second explosion-proof valve 100. The vertical distance V mm between the second explosion-proof valve 100 and the sealing element 50 reduces the impact of high-temperature gas on the sealing element 50, thereby reducing the possibility of sealing element 50 failure, so that thermal runaway can be internally controlled within the sub-chamber 102. Preferably, the vertical distance V mm can be 10 mm, 50 mm, 60 mm, or 80 mm.

[0096] The parameter values ​​of the first spacing distance A mm, the thickness before compression T0 mm, the thickness after compression T1 mm, and the second spacing distance B mm will affect the degree of deformation of the separator beam 20 of the battery pack and the connection strength between the pole post 32 and the connecting piece.

[0097] Test method for measuring the degree of deformation of the partition beam 20:

[0098] The test subject was a battery pack. For each embodiment and comparative example, 200 battery cells were taken and grouped together, then fixed to the bottom plate of the housing 10 with the partition beam 20. An initial center line was drawn at the top of the partition beam 20, along the center of the width of the partition beam 20. Then, conductive busbars 33 were welded to the terminal posts 32 of the battery cells. After installation, the housing cover 40 was closed and secured.

[0099] According to GB / T2423.43, the test object was mounted on a vibration table. The test procedure was carried out according to GB / T2423.56. Random and fixed-frequency vibration loads were applied in each direction, and the loading sequence should preferably be random z-axis, fixed-frequency z-axis, random y-axis, fixed-frequency y-axis, random x-axis, fixed-frequency x-axis (the direction of the line connecting the front and rear of the battery pack is the x-axis direction, and the other horizontal direction perpendicular to the x-axis direction is the y-axis direction). The vibration frequency, power spectral density (PSD), vibration time, etc., are shown in the table below.

[0100]

[0101] After the test, remove the battery pack cover 40. Using the line connecting the midpoints of the two ends of the separator beam 20 as the baseline, use calipers to measure the maximum deviation between the original center line and the baseline in the width direction of the separator beam 20. A maximum deviation greater than 3mm is considered unqualified.

[0102] Tests to measure the connection strength between the pole and the adapter:

[0103] The specific test conditions and parameters are the same as those in Test 1 above. After the test, the battery is removed and the bottom of the terminals and adapter plates are inspected for broken solder joints. A total of more than 10% of the solder joints are considered unqualified. Specifically, the terminals 32 are electrically connected to the tabs 313 of the battery body 31 through the adapter plates. The two ends of the adapter plates are welded to the terminals 32 and the tabs 313, respectively.

[0104]

[0105] In Examples 1 to 6, the first interval distance A mm, the difference between the thickness T0 mm before compression and the thickness T1 mm after compression, the second interval distance B mm, and the formula value of A×(T0-T1)×B are all within the preferred range of this application. After testing, the maximum deviation distance between the original center line and the baseline, as well as the proportion of solder fracture at the bottom of the pole post and the adapter piece, are all qualified.

[0106] In Example 7, the first interval distance A mm is outside the preferred range, the difference between the thickness T0 mm before compression and the thickness T1 mm after compression, the second interval distance B mm, and the formula value of A×(T0-T1)×B are all within the preferred range of this application. After the test, the maximum deviation distance between the original center line and the baseline is equal to 3 mm, which is within the boundary value of the qualified range; the proportion of broken solder marks at the bottom of the pole and the adapter plate is less than 10%, which is within the qualified range.

[0107] In Example 8, the difference between the thickness T0 mm before compression and the thickness T1 mm after compression is outside the preferred range. The first interval distance A mm, the second interval distance B mm, and the formula values ​​of A×(T0-T1)×B are all within the preferred range of this application. After testing, the maximum deviation between the original center line and the baseline is less than 3 mm, which is within the acceptable range. The proportion of solder fracture at the bottom of the pole post and the adapter plate is equal to 10%, which is within the boundary value of the acceptable range.

[0108] In Comparative Examples 1 and 2, several parameters are outside the preferred range, and the formula values ​​of A×(T0-T1)×B in both Comparative Examples 1 and 2 are also outside the preferred range. After testing, the maximum deviation between the original center line and the baseline in Comparative Example 1 is less than 3 mm, which is within the acceptable range, but the proportion of broken solder marks at the bottom of the pole and adapter plate is greater than 10%, which is within the unacceptable range. In Comparative Example 2, the proportion of broken solder marks at the bottom of the pole and adapter plate is less than 10%, which is within the acceptable range, but the maximum deviation between the original center line and the baseline is greater than 3 mm, which is within the unacceptable range.

[0109] This application also provides an electrical device, an embodiment of which includes a battery pack, wherein the battery pack is the aforementioned battery pack. The aforementioned battery pack effectively solves the problem in related technologies where the separator beam is prone to deformation, affecting the connection strength between the conductive bar and the terminal post. The electrical device having the aforementioned battery pack also possesses the aforementioned advantages.

[0110] Specifically, electrical devices may be used in passenger vehicles.

[0111] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention 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 invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0112] 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.

[0113] 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 should not be construed as limiting the scope of protection of this invention.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body (10) having a containing cavity (101); a partition beam (20) arranged in the box body (10) and dividing the containing cavity (101) into a plurality of sub-chambers (102), each of which is provided with a battery pack (30); a box cover (40) covering the box body (10) and sealing the containing cavity (101); a sealing element (50) arranged between the partition beam (20) and the box cover (40) and separating two adjacent sub-chambers (102); wherein the battery pack (30) comprises a battery body (31), a pole (32) arranged on the top surface of the battery body (31), and a conductive row (33) arranged above the pole (32) and electrically connected to the pole (32), the top surface of the partition beam (20) is higher than the top surface of the battery body (31), and the first interval distance A mm is between the top surface of the partition beam (20) and the top surface of the battery body (31), the sealing element (50) has a pre-compression thickness T0 mm and a post-compression thickness T1 mm, and the top surface of the conductive row (33) and the top surface of the battery body (31) have a second interval distance B mm, wherein the first interval distance A mm, the pre-compression thickness T0 mm, the post-compression thickness T1 mm and the second interval distance B mm satisfy: 40≤A×(T0-T1)×B≤320.

2. The battery pack of claim 1, wherein, The partition beam (20) is arranged at a third interval distance C mm in the transverse direction from at least one battery pack (30), and the third interval distance C mm satisfies: 2mm≤C mm≤12mm.

3. The battery pack of claim 2, wherein, A partition element (60) is arranged between the partition beam (20) and the battery pack (30) arranged at intervals, and the two opposite sides of the partition element (60) are in contact with the partition beam (20) and the battery pack (30) respectively, wherein the partition element (60) has a first height H1 mm, the battery body (31) has a second height H2 mm, and the first height H1 mm and the second height H2 mm satisfy: 0.65≤H1 / H2≤1.

2.

4. The battery pack of claim 3, wherein, The surface of the partition element (60) facing the partition beam (20) is provided with a buffer recess (61).

5. The battery pack of claim 4, wherein, The buffer recess (61) is a plurality of recesses, wherein the fourth interval distance D mm is between the uppermost buffer recess (61) and the box cover (40), and the fourth interval distance D mm satisfies: D mm≤50mm.

6. The battery pack of claim 4, wherein, The buffer recess (61) is a plurality of recesses, wherein the fifth interval distance E mm is between the lowermost buffer recess (61) and the bottom surface of the containing cavity (101), and the fifth interval distance E mm satisfies: E mm≤20mm.

7. The battery pack of claim 3, wherein, The surface of the battery body (31) is provided with an insulating film (34), the insulating film (34) on the surface of the battery body (31) facing the partition (60) has a window part (341), the window part (341) is provided with an adhesive layer for connecting the battery body (31) and the partition (60), the window part (341) has a first surface area S1 mm 2 , the surface of the battery body (31) facing the partition (60) has a second surface area S2 mm 2 , the first surface area S1 mm 2 and the second surface area S2 mm 2 meet: 0.1≤S1 / S2≤0.

95.

8. The battery pack of claim 7, wherein The window part (341) and the top surface of the battery body (31) have a sixth spacing distance F mm, which satisfies: F mm≤20 mm; and / or, The window part (341) and the bottom surface of the battery body (31) have a seventh spacing distance G mm, which satisfies: G mm≤20 mm.

9. The battery pack of claim 7, wherein, The window part (341) and the top surface of the partition beam (20) have an eighth spacing distance H mm, which satisfies: 3 mm≤H mm≤20 mm.

10. The battery pack of any one of claims 1-9, wherein, The partition beam (20) is provided with a first battery pack (301) and a second battery pack (302) on both sides respectively, in the transverse direction, the partition beam (20) and the first battery pack (301) have a first transverse distance C1 mm, the partition beam (20) and the second battery pack (302) have a second transverse distance C2 mm, and the first transverse distance C1 mm and the second transverse distance C2 mm satisfy: |C1 mm-C2 mm|≤10 mm.

11. The battery pack of any one of claims 1-9, wherein, The partition beam (20) is a hollow beam, and at least one partition rib (21) extending in the transverse direction is arranged in the hollow beam.

12. The battery pack of claim 11, wherein, In the vertical direction, the top surface of the battery body (31) is located between the top surface of the partition beam (20) and the uppermost partition rib (21).

13. The battery pack of claim 12, wherein, The top surface of the battery body (31) and the uppermost partition rib (21) have a ninth spacing distance I mm, which satisfies: 3 mm≤I mm≤15 mm.

14. The battery pack of claim 11, wherein, The battery body (31) comprises a battery shell (311) and a battery cell (312) arranged in the battery shell (311), the battery cell (312) has a tab (313) leading upward, and in the vertical direction, the tab (313) is arranged staggered with the partition rib (21).

15. The battery pack of claim 11, wherein, The hollow beam is provided with at least two partition ribs (21), and adjacent two partition ribs (21) have a tenth spacing distance J mm, which satisfies: 5 mm≤J mm≤30 mm.

16. The battery pack of claim 11, wherein, In the vertical direction, the uppermost partition rib (21) and the sealing member (50) have an eleventh spacing distance K mm, which satisfies: 10 mm≤K mm≤30 mm.

17. The battery pack of claim 11, wherein, The partition beam (20) has an opening structure (22) at both ends in the length direction, and a buffer sealing structure (80) is arranged in the partition beam (20), which seals at least one opening structure (22).

18. The battery pack of claim 17, wherein, The partition beam (20) is provided with a glue pouring hole (23) on the side surface of the battery pack (30), the glue pouring hole (23) is used for pouring the buffer sealing structure (80) into the partition beam (20), the glue pouring hole (23) has a twelfth interval distance L mm from the preset center surface of the partition beam (20), the twelfth interval distance L mm satisfies: L mm≤150 mm, and the preset center surface is a center surface perpendicular to the length direction of the partition beam (20).

19. The battery pack of any one of claims 1-9, wherein, A plurality of first fixing holes (24) are arranged on the top surface of the partition beam (20), and the battery pack further comprises a fastener penetrating the box cover (40), the sealing member (50) and the first fixing hole (24), so that the sealing member (50) is clamped between the partition beam (20) and the box cover (40).

20. The battery pack of claim 19, wherein, In the length direction of the partition beam (20), two adjacent first fixing holes (24) have a thirteenth interval distance M mm, and the thirteenth interval distance M mm satisfies: 15 mm≤M mm≤150 mm.

21. The battery pack of claim 19, wherein, In the length direction of the partition beam (20), two adjacent first fixing holes (24) are at least partially misaligned in the width direction of the partition beam (20).

22. The battery pack of claim 19, wherein, The first fixing hole (24) and the side edge of the sealing member (50) have a fourteenth interval distance N mm, and the fourteenth interval distance N mm satisfies: 2 mm≤N mm≤8 mm.

23. The battery pack of any one of claims 1-9, wherein, Two rows of second fixing holes (25) are arranged on the top surface of the partition beam (20).

24. The battery pack of any one of claims 1-9, wherein, The sealing member (50) has a first width W1 mm, the partition beam (20) has a second width W2 mm, and the first width W1 mm and the second width W2 mm satisfy: 0.8≤W1 / W2≤1.

2.

25. The battery pack of any one of claims 1-9, wherein, The box body (10) has a side beam (11), both ends of the partition beam (20) are connected with the side beam (11), and the end of the sealing member (50) extends above the side beam (11).

26. The battery pack of any one of claims 1-9, wherein, The box cover (40) has a first area corresponding to the partition beam (20) and a second area corresponding to the sub-chamber (102), and the first area is lower than the second area.

27. The battery pack of claim 26, wherein, The width of the first area is greater than or equal to the width of the sealing member (50).

28. The battery pack of any one of claims 1-9, wherein, The battery body (31) has a first side surface, a second side surface, a third side surface and a fourth side surface connected in sequence, the first side surface and the third side surface are oppositely arranged, the second side surface and the fourth side surface are oppositely arranged, the area of the first side surface is smaller than the area of the second side surface, and the first side surface is oppositely arranged with the partition beam (20), wherein the first interval distance A mm, the compression thickness T0 mm, the compression thickness T1 mm and the second interval distance B mm satisfy: 50≤A×(T0-T1)×B≤320.

29. The battery pack of any one of claims 1-9, wherein, The battery body (31) has a first side, a second side, a third side and a fourth side connected in sequence, the first side and the third side are oppositely arranged, the second side and the fourth side are oppositely arranged, the area of the first side is smaller than the area of the second side, the second side is oppositely arranged with the partition beam (20), wherein the first interval distance A mm, the compression before thickness T0 mm, the compression after thickness T1 mm and the second interval distance B mm satisfy: 40≤A×(T0-T1)×B≤310.

30. The battery pack of any one of claims 1-9, wherein, The battery body (31) has a first explosion-proof valve (314) arranged on the bottom surface of the battery body (31).

31. The battery pack of any one of claims 1-9, wherein, The battery pack further comprises a second explosion-proof valve (100) arranged on the box (10), the second explosion-proof valve (100) has a vertical interval V mm with the sealing piece (50), and the vertical interval V mm satisfies: 10mm≤V mm.

32. The battery pack of any one of claims 1-9, wherein, The first interval distance A mm satisfies: 5mm≤A mm≤10mm.

33. The battery pack of any one of claims 1-9, wherein, The compression before thickness T0 mm and the compression after thickness T1 mm satisfy: 1.2mm≤T0 mm-T1mm≤5mm.

34. The battery pack of any one of claims 1-9, wherein, The second interval distance B mm satisfies: 4mm≤B mm≤7mm.

35. An electrically powered device comprising a battery pack, characterized in that The battery pack is the battery pack of any one of claims 1-34.

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