Battery pack

Abstract

The utility model describes a battery pack, which comprises a box body, a fuse, a fire-fighting device and a battery management unit assembly, wherein the box body comprises a top plate positioned on one side of the box body; the fuse is connected to the top plate; the fire fighting device is connected to the top plate and used for releasing a fire extinguishing agent by sensing temperature changes. The battery management unit assembly is connected to the top plate and located between the fire fighting device and the fuse. Therefore, the battery management unit assembly is arranged between the fire-fighting device and the fuse, and the fire-fighting device is separated from the fuse, so that the influence on the fire-fighting device when the fuse is heated can be reduced, the fire-fighting device is prevented from releasing a fire extinguishing agent mistakenly, and the safety performance of the battery pack is ensured.

Description

Technical Field

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

[0002] In new energy devices such as electric vehicles, mobile power banks, and energy storage systems, the battery pack is a core component. To minimize the space occupied by the battery pack, its components are typically arranged compactly to reduce its size. Because the battery pack stores a large amount of energy in a small space, its safety performance is of paramount importance. In traditional battery pack designs, if the components are not arranged rationally, it may affect stable operation and even pose safety hazards. Utility Model Content

[0003] In view of the above-mentioned existing situation, this application provides a battery pack that can improve the safety performance of the battery pack.

[0004] This utility model provides a battery pack, comprising: a housing, the housing including a top plate located on one side of the housing; a fuse connected to the top plate; a fire-fighting device connected to the top plate, the fire-fighting device being used to release a fire extinguishing agent by sensing temperature changes; and a battery management unit assembly connected to the top plate and located between the fire-fighting device and the fuse.

[0005] Optionally, the battery management unit assembly includes a first bracket, a second bracket, and two battery management units; the first bracket is connected to the second bracket, and a receiving space is formed between the first bracket and the second bracket; the first bracket and / or the second bracket is connected to the top plate; one battery management unit is connected to the side of the first bracket away from the second bracket, and the other battery management unit is connected to the second bracket and located within the receiving space.

[0006] Optionally, the second support includes a receiving groove recessed in a direction away from the first support, the receiving groove forming the receiving space; or, the first support includes a receiving groove recessed in a direction away from the second support, the receiving groove forming the receiving space.

[0007] Optionally, the first bracket and / or the second bracket are provided with weight-reducing holes.

[0008] Optionally, the battery management unit assembly includes a third bracket and two battery management units; the two battery management units are respectively connected to opposite sides of the third bracket, and the third bracket is connected to the housing.

[0009] Optionally, the housing includes a lid and a base, the bottom of which is detachably connected to the base; the top plate is located on one side of the lid, and the lid has an inner cavity for accommodating the battery module, the battery module being located in the inner cavity and connected to the base.

[0010] Optionally, the battery pack further includes a liquid cooling pipe interface for connecting to an external liquid cooling pipe; the base includes a mounting portion that protrudes from the top plate on the side opposite to the battery module, and the liquid cooling pipe interface is connected to the mounting portion.

[0011] Optionally, the battery pack further includes a high-voltage connector assembly and an explosion-proof valve; the fire-fighting device, the battery management unit assembly, the fuse, and the high-voltage connector assembly are all connected to the outside of the top plate and located above the liquid cooling pipe interface.

[0012] Optionally, the top plate has a through groove that communicates with the interior of the enclosure; the enclosure also includes a maintenance cover that is detachably connected to the top plate, the maintenance cover having an accommodating space, the explosion-proof valve being connected to the maintenance cover and communicating with the accommodating space; the maintenance cover is closed to the through groove, and the fire-fighting device, the battery management unit assembly, and the fuse are located within the accommodating space.

[0013] Optionally, the maintenance cover protrudes from the top plate by a distance between 15mm and 25mm.

[0014] The battery pack disclosed in this invention includes a housing, a fuse, a fire suppression system, and a battery management unit (BMU) assembly. The fire suppression system releases extinguishing agent based on temperature changes. Typically, the fuse is the hottest component in the battery pack. Therefore, this invention isolates the fire suppression system from the fuse by placing the BMU assembly between them. This reduces the impact of the fuse heating up on the fire suppression system, prevents the fire suppression system from erroneously releasing extinguishing agent, and ensures the safety performance of the battery pack. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram showing the overall structure of the battery pack involved in this application.

[0018] Figure 2 This is a partial structural schematic diagram of the battery pack involved in this application.

[0019] Figure 3 This is a schematic diagram showing the release path of the fire extinguishing agent involved in this application inside the battery pack.

[0020] Figure 4 This is an exploded view of the battery pack involved in this application.

[0021] Figure 5 This is another partial structural schematic diagram of the battery pack involved in this application.

[0022] Figure 6 This is another partial structural schematic diagram of the battery pack involved in this application.

[0023] Figure 7 This is a partial cross-sectional view showing the battery pack involved in this application.

[0024] Figure 8 This is a side view showing the battery pack involved in this application.

[0025] Figure 9 This is another partial structural schematic diagram of the battery pack involved in this application.

[0026] Figure 10 This is another partial structural schematic diagram of the battery pack involved in this application.

[0027] Figure 11 This is another partial structural schematic diagram of the battery pack involved in this application.

[0028] Reference numerals: 100, Battery pack; 1, Housing; 11, Cover; 111, Top plate; 112, Through slot; 113, Through hole; 114, Bottom plate; 12, Base; 121, Mounting part; 13, Maintenance cover; 14, Insulating component; 15, Crossbeam; 2, Battery module; 21, First battery module; 22, Second battery module; 23, Third battery module; 24, Fourth battery module; 3, Isolator; 31, First notch; 32, Second notch; 4, Fire-fighting device; 5, Explosion-proof valve; 6, Battery management unit assembly; 61, First bracket; 62, Second bracket; 63, Third bracket; 64, Battery management unit; 65, Weight reduction hole; 7, Fuse; 8, High-voltage connector assembly; 9, Liquid cooling pipe interface. Detailed Implementation

[0029] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components, and repeated descriptions are omitted. Furthermore, the drawings are merely schematic diagrams, and the proportions of the components or their shapes may differ from actual dimensions. It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0031] Reference Figures 1 to 4 This application provides a battery pack 100, which includes a housing 1 and an isolation member 3 and a fire-fighting device 4 disposed inside the housing 1. The housing 1 includes a top plate 111 and a bottom plate 114 disposed opposite to each other. One end of the isolation member 3 is connected to the top plate 111 of the housing 1, and the other end of the isolation member 3 has a gap with the bottom plate 114. The fire-fighting device 4 is connected to the top plate 111 and is located on one side of the isolation member 3. The fire-fighting device 4 can release a fire extinguishing agent to diffuse inside the housing 1. The battery pack 100 also includes an explosion-proof valve 5, which is connected to the top plate 111 and is located on the side of the isolation member 3 away from the fire-fighting device 4.

[0032] According to the above structure, the battery model of this application is located inside the housing 1. One end of the separator 3 has a gap with the bottom plate, through which the fire-fighting device 4 can release extinguishing agent to diffuse within the housing 1. Specifically, when a fire breaks out inside the battery pack 100, the fire-fighting device 4 releases extinguishing agent, and the explosion-proof valve 5 opens due to the increased pressure inside the battery pack 100 to discharge the extinguishing agent and smoke. Due to the separator 3, the extinguishing agent first diffuses within the housing 1 on the side corresponding to the fire-fighting device 4, and then diffuses through the gap to the side of the housing 1 corresponding to the explosion-proof valve 5. Therefore, the extinguishing agent can fully diffuse within the housing 1 before reaching the explosion-proof valve 5, thereby allowing the extinguishing agent to reach as many parts of the multiple battery modules 2 as possible, achieving more comprehensive coverage of the multiple battery modules 2 and achieving a better fire extinguishing effect. In addition, the isolation element 3 can also prolong the time for the extinguishing agent to be discharged from the explosion-proof valve 5, so that the extinguishing agent can fully extinguish the flame inside the battery pack 100 and reduce the probability of the battery pack 100 reigniting.

[0033] For easier understanding, please refer to Figure 1The width direction of the housing 1 is the X-axis direction, the length direction of the housing 1 is the Y-axis direction, and the height direction of the housing 1 is the Z-axis direction. In this embodiment, the top plate 111 and the bottom plate 114 are distributed along the length direction of the housing 1.

[0034] Specifically, refer to Figure 3 Due to the design of the isolator 3, the extinguishing agent's discharge path after release can form a U-shape, with the starting point of the U-shaped path being the fire-fighting device 4 and the ending point being the explosion-proof valve 5. After the fire-fighting device 4 releases the extinguishing agent, it is discharged from the fire-fighting device 4 and then diffuses towards the base plate 114. In the early stages of extinguishing agent release, it mainly remains on the side of the isolator 3 facing the fire-fighting device 4. As the extinguishing agent continues to diffuse, it passes through the gap between the isolator 3 and the base plate 114, thus continuing to diffuse towards the side of the isolator 3 facing the explosion-proof valve 5. Then, the extinguishing agent continues to diffuse from the base plate 114 towards the explosion-proof valve 5, finally being discharged from the explosion-proof valve to the outside of the enclosure 1. In this way, the extinguishing agent can diffuse in zones on both sides of the isolator within the enclosure 1, extending the residence time of the extinguishing agent inside the enclosure 1. Understandably, in related technologies, due to the absence of an isolator 3, the extinguishing agent, after release, does not fully diffuse within the battery pack 100 before being quickly discharged through the explosion-proof valve 5. This may not only result in the extinguishing agent failing to reach the vicinity of the burning battery module 2, but also lead to insufficient extinguishing due to the rapid discharge of the extinguishing agent, causing the fire in the battery module 2 to reignite. The battery pack 100 provided in this application effectively solves the aforementioned technical problems.

[0035] The extinguishing agent selected in this application can be an extinguishing aerosol, or a diffuse gaseous extinguishing agent such as carbon dioxide or nitrogen. Specifically, after the fire-fighting device 4 is activated, this type of extinguishing agent can diffuse in the space and cover the entire space to extinguish the fire. Furthermore, this type of extinguishing agent leaves no obvious residue after release and will not damage the battery pack 100. The aerosol extinguishing agent is composed of an oxidant, a reducing agent, and a combustion rate control agent, and is compressed into solid blocks and contained within the fire-fighting device 4. After the fire-fighting device 4 is triggered, the aerosol extinguishing agent rapidly diffuses within the battery pack 100, submerging the battery modules 2 within the battery pack 100 in the aerosol smoke. After release, the aerosol extinguishing agent uses air as the dispersion medium and solid or liquid particles as the dispersion phase. It possesses gaseous fluidity, allowing it to bypass obstacles and diffuse, thus penetrating corners and crevices to achieve comprehensive fire extinguishing coverage. In addition, the aerosol cloud formed during the release of aerosol extinguishing agents can not only absorb heat around the flames and lower the temperature, but also compete with oxygen in the flames, reducing the oxygen supply to the flames and thus achieving the effect of suffocation and extinguishing the fire.

[0036] In some embodiments, along the height direction of the housing 1, the two ends of the isolator 3 respectively abut against the inner wall of the housing 1. It is understood that the upper and lower ends of the isolator 3 can be as close as possible to the inner wall of the housing 1, making it difficult for the extinguishing agent to pass through the upper and lower ends of the isolator 3, thereby allowing the extinguishing agent to diffuse along a U-shaped path as much as possible. Therefore, the extinguishing agent can reach as many parts of the multiple battery modules 2 as possible, achieving more comprehensive coverage of the multiple battery modules 2, and prolonging the time for the extinguishing agent to be discharged from the explosion-proof valve 5.

[0037] In some embodiments, the battery pack 100 further includes multiple battery modules 2, with the separator 3 located between two adjacent battery modules 2. Thus, battery modules 2 are located on both sides of the separator 3. Under the action of the separator 3, the fire extinguishing agent can fully diffuse within the housing 1, thereby achieving more comprehensive coverage of the battery modules 2 on both sides of the separator 3 and achieving a better fire extinguishing effect.

[0038] In some embodiments, the number of battery modules 2 located on both sides of the separator 3 is equal. In this embodiment, it can also be understood as being located in the middle of the top plate 111 along the width direction of the housing 1. Thus, the separator 3 evenly divides the space inside the housing 1, making the space on both sides of the separator 3 approximately equal in size.

[0039] Reference Figure 5 In some examples, along the width direction of the housing 1, multiple battery modules 2 include a first battery module 21, a second battery module 22, a third battery module 23, and a fourth battery module 24 arranged sequentially, with the spacer 3 located between the second battery module 22 and the third battery module 23. In other examples, there may be one battery module 2 on each side of the spacer 3, or there may be three battery modules 2 on each side.

[0040] In some embodiments, the battery module 2 includes a bottom surface facing the base plate 114, with a gap between the bottom surface and the base plate 114. This allows the extinguishing agent to permeate the gap between the bottom surface and the base plate 114, thus ensuring the extinguishing agent adequately surrounds the battery module 2 and improves the fire extinguishing effect. It is understood that a channel for the extinguishing agent to pass through can also be formed between the bottom surface and the base plate 114, allowing the extinguishing agent to quickly move from one side of the separator 3 to the other.

[0041] In some embodiments, the end of the isolator 3 facing the base plate 114 is on the same plane as the bottom surface. It is understood that when the bottom surface and the end of the isolator 3 facing the base plate 114 are both on the same plane, a relatively complete channel can be formed between the bottom surface and the base plate, allowing the extinguishing agent to quickly travel from one side of the isolator 3 to the other through this channel, resulting in higher extinguishing efficiency. In other embodiments, the bottom surface is located between the end of the isolator 3 facing the base plate 114 and the base plate 114. Conversely, if the end of the isolator 3 facing the base plate 114 protrudes from the bottom surface, the isolator 3 blocks part of the channel formed between the bottom surface and the base plate 114, which to some extent affects the speed at which the extinguishing agent diffuses to the other side of the isolator 3.

[0042] In some examples, along the height of the housing 1, the bottom of the battery module 2 is connected to the bottom of the housing 1, and the top of the battery module 2 has a gap with the housing 1; along the lateral direction of the housing 1, the outer wall of the battery module 2 has a gap with the inner wall of the housing 1. This gap arrangement allows the extinguishing agent to better diffuse within the housing 1, enabling it to more fully cover the battery module 2, resulting in a better fire extinguishing effect.

[0043] In some embodiments, an insulating member 14 may be provided on the inner wall of the housing 1. The insulating member 14 may be located in an area other than the top plate 111. In related technologies, since the battery pack 100 may be subjected to external pressure during use, if the housing 1 is deformed by pressure, the inner wall of the housing 1 will directly contact the battery module 2. Therefore, the insulating member can provide an insulating layer, thereby enhancing the safety and reliability of the battery pack 100. Specifically, the insulating member 14 has a sheet-like structure and is attached to the inner wall of the housing 1. In some examples, both the insulating member 14 and the separator 3 can be made of polypropylene material. Polypropylene, abbreviated as PP, is a good electrical insulating material. The insulating member 14 can prevent contact between the battery module 2 and the housing 1, avoiding short circuits.

[0044] Reference Figure 6 In some embodiments, the separator 3 is provided with a first notch 31, which is located at one end of the separator 3 facing the top plate 111, for avoiding electronic devices of the battery pack 100, and the edge of the first notch 31 is in contact with the outer contour of the avoided electronic device.

[0045] The electronic components can be battery management unit assembly 6 or connecting copper busbars, etc., and these electronic components are usually arranged in the area of ​​the top plate 111. Specifically, the shape of the first notch 31 can be designed according to the outer contour of the electronic component to be avoided, so that the edge of the first notch 31 can fit the outer contour of the electronic component as closely as possible, so as to minimize the gap between the first notch 31 and the electronic component and reduce the passage of fire extinguishing agent at the first notch 31.

[0046] In some embodiments, the separator 3 is provided with a second notch 32, which is used to avoid protruding structures on the inner wall of the housing 1. Since the inner wall of the housing 1 is typically not completely flat, such as... Figure 4 In the middle, the bottom of the housing 1 is provided with a raised crossbeam 15, which is used to connect and fix the battery module 2. The separator 3 needs to be provided with a second notch 32 for the crossbeam 15 to pass through. The shape of the second notch 32 can be designed according to the outer contour of the crossbeam 15 to be avoided, so that the edge of the second notch 32 can fit the outer contour of the crossbeam 15 as closely as possible, so as to minimize the gap between the second notch 32 and the crossbeam 15 and reduce the amount of fire extinguishing agent passing through the second notch 32.

[0047] Reference Figure 7 In some embodiments, the isolating element 3 includes a side facing the fire-fighting device 4 or the explosion-proof valve 5. The isolating element 3 separates a first space facing the fire-fighting device 4 and a second space facing the explosion-proof valve 5 within the housing 1. A main channel for supplying extinguishing agents from the first space to the second space is formed between the edge of the isolating element 3 and the inner wall of the housing 1. The area of ​​the main channel on the plane containing the side is S1. The channel formed by the end face of the isolating element 3 facing the bottom plate and the inner wall of the housing 1 is the design channel. The area of ​​the design channel on the plane containing the side is S2. Wherein, S2 / S1 ≥ 80%. Specifically, due to the presence of structures such as the first notch 31 and the second notch 32 in the isolating element 3, and because the inner wall of the housing 1 is usually not completely flat, extinguishing agents can also pass through the gaps between the isolating element 3 and the electronic components, and also through the gaps between the isolating element 3 and the inner wall of the housing 1. These gaps, together with the design channel, form the main channel, except for the design channel used for supplying extinguishing agents. It can be understood that S1 = S2 + the area of ​​the gap on the plane containing the side. To ensure that the extinguishing agent passes through the designed channels as much as possible, the ratio of S2 / S1 is set to ≥80%, maximizing the proportion of the designed channels. This allows the extinguishing agent to pass through these channels rather than through gaps, ensuring it diffuses sufficiently within the enclosure 1 before reaching the explosion-proof valve 5. This allows the extinguishing agent to reach all areas of the multiple battery modules 2, achieving more comprehensive coverage and better fire extinguishing effect. Furthermore, it prolongs the time for the extinguishing agent to exit from the explosion-proof valve 5, allowing it to fully extinguish the flames within the battery pack 100 and reducing the probability of reignition.

[0048] The following description, through comparative examples 1 to 2 and examples 1 to 5, illustrates the changes in the fire extinguishing effect within the battery pack 100 according to the limitation of the ratio of S2 to S1 in the embodiments of this application.

[0049] In the battery packs of Comparative Examples 1 to 2 and Examples 1 to 5, when a fire broke out inside the battery pack 100, the percentage of flammable gas inside the battery pack 100 is recorded in the table below. Specific parameters are shown in Table 1.

[0050] Table 1

[0051]

[0052] Those skilled in the art can see from the above comparative examples 1 to 2 and examples 1 to 5 that setting the isolation element 3 can improve the fire extinguishing effect, and when S2 / S1≥80%, the flammable gas in the battery pack 100 is lower, and the fire extinguishing effect is better.

[0053] In some embodiments, the spacer 3 is bonded to the inner wall of the housing 1. Specifically, along the length of the housing 1, the end of the spacer 3 facing the top plate 111 is bonded to the top plate 111; along the height of the housing 1, both ends of the spacer 3 are bonded to the inner wall of the housing 1. Therefore, fixing the spacer 3 by bonding provides a more stable fixation effect, reducing the possibility of loosening and displacement. Furthermore, bonding provides a better sealing effect because the adhesive forms a sealing layer after curing, preventing gas penetration. In addition, the adhesive can adapt to uneven surfaces of the inner wall of the housing 1, resulting in a better connection.

[0054] In other embodiments, the spacer 3 may also abut against the inner wall of the housing 1. Specifically, since the spacer 3 is located between two adjacent battery modules 2, the spacer 3 can be sandwiched between the two adjacent battery modules 2, thereby fixing the spacer 3 inside the housing 1. In the length direction of the housing 1, the end of the spacer 3 facing the top plate 111 abuts against the top plate 111, and in the height direction of the housing 1, both ends of the spacer 3 abut against the inner wall of the housing 1.

[0055] In some examples, for ease of installation, the bottom of the spacer 3 can be glued along the height of the housing 1, and then inserted between two adjacent battery modules 2. The top of the spacer 3 abuts against the inner wall of the housing 1, and the end of the spacer 3 facing the top plate 111 can also abut against the top plate 111.

[0056] In some embodiments, along the height direction of the housing 1, the spacer 3 protrudes from the surface of the battery module 2, and the protrusion height is between 8mm and 22mm. The distance by which the spacer 3 protrudes from the battery module 2 can also be the distance between the battery module 2 and the inner wall of the housing 1. A protrusion height of 8mm-22mm meets the electrical design requirements of the battery pack 100 and also allows for a more compact structure of the battery pack 100. In some examples, the height of the spacer 3 protruding from the surface of the battery module 2 can be one of 8mm, 10mm, 13mm, 15mm, 18mm, 20mm, or 22mm.

[0057] In some embodiments, the separator 3 has a plate-like structure, and its thickness is between 2mm and 5mm. In some examples, the thickness of the separator 3 can be one of 2mm, 3mm, 3.5mm, 4mm, and 5mm. The selected separator 3 has a Shore hardness of 40HC-70HC, which allows it to withstand pressures below 10Kpa, ensuring that it is not easily deformed by excessive pressure during thermal runaway of the battery pack 100, thus preventing the separator 3 from failing its isolation function. Furthermore, it is not too thick to avoid interfering with components such as the battery module 2 inside the housing 1.

[0058] In some embodiments, the battery pack 100 is a sodium-ion battery pack 100. Thus, the battery pack 100 of this application uses sodium ions as charge carriers. Sodium is more abundant on Earth than lithium, easier to obtain, has lower raw material costs, and lower manufacturing costs.

[0059] Reference Figure 2 In some embodiments, the battery pack 100 further includes a battery management unit assembly 6 and a fuse 7; both the battery management unit assembly 6 and the fuse 7 are connected to the top plate 111, and the battery management unit assembly 6 is located between the fire-fighting device 4 and the fuse 7. The fire-fighting device 4 is used to release extinguishing agent by sensing temperature changes. Typically, the fuse 7 is the device with the highest operating temperature in the battery pack 100. Therefore, by placing the battery management unit assembly 6 between the fire-fighting device 4 and the fuse 7, the fire-fighting device 4 and the fuse 7 are isolated, thereby reducing the impact of the fuse 7 heating up on the fire-fighting device 4, preventing the fire-fighting device 4 from mistakenly releasing the extinguishing agent, and ensuring the safety performance of the battery pack 100.

[0060] In related technologies, the battery management unit component 6 is responsible for monitoring and managing the battery's operating status and can also perform operations such as balancing, for example, by adjusting the current to keep the charge level of all battery modules 2 consistent.

[0061] Each battery module 2 consists of multiple battery cells, and each cell is equipped with an explosion-proof valve. When thermal runaway occurs in the battery pack 100, a large amount of heat is typically generated inside the battery cells. The hot airflow inside the cells can impact the explosion-proof valve, causing it to rupture or detach, allowing the hot airflow to escape. In this embodiment, the fire-fighting device 4 extends a thermistor and is positioned near the explosion-proof valve of each battery cell. After thermal runaway occurs, the fire-fighting device 4 can detect the thermal runaway temperature. When the thermal runaway temperature reaches a preset value, it indicates a fire within the battery pack 100, triggering the fire-fighting device 4 to release extinguishing agent to cool the interior of the battery pack 100 and isolate it from oxygen.

[0062] Reference Figures 4 to 11 In some embodiments, the battery management unit assembly 6 includes a first bracket 61, a second bracket 62, and two battery management units 64. The first bracket 61 is connected to the second bracket 62, and a receiving space is formed between the first bracket 61 and the second bracket 62. The first bracket 61 and / or the second bracket 62 are connected to the top plate 111. One battery management unit 64 is connected to the side of the first bracket 61 opposite to the second bracket 62, and the other battery management unit 64 is connected to the second bracket 62 and located within the receiving space. Thus, the two battery management units 64 are overlapped in the thickness direction, making the structure of the battery management unit assembly 6 more compact. Furthermore, compared to the battery pack 100 using one battery management unit 64 in related technologies, the volume of one battery management unit 64 is usually larger. However, this embodiment can use two battery management units 64, resulting in a smaller individual volume of the two battery management units 64. This allows the smaller battery management units 64 to be flexibly installed on the battery pack 100, improving space utilization.

[0063] Specifically, since the two battery management units 64 are connected to the first bracket 61 and the second bracket 62 respectively, when it is necessary to maintain a single battery management unit 64, it is only necessary to disassemble the corresponding bracket to carry out the operation. This can significantly improve maintenance efficiency and reduce unnecessary disassembly work.

[0064] In some embodiments, the second bracket 62 includes a recessed receiving groove that is recessed away from the first bracket 61, forming a receiving space. Thus, the receiving groove of the second bracket 62 can accommodate a battery management unit 64. The first bracket 61 and the second bracket 62 are screwed together, and the second bracket 62 is screwed to the top plate 111.

[0065] In other embodiments, the first support 61 includes a receiving groove recessed in a direction away from the second support 62, the receiving groove forming a receiving space.

[0066] Reference Figure 10 and Figure 11The first bracket 61 and / or the second bracket 62 are provided with weight-reducing holes 65. Therefore, the weight-reducing holes 65 not only help reduce the weight of the first bracket 61 and / or the second bracket 62, but also provide heat dissipation. The weight-reducing holes 65 facilitate air convection to dissipate heat from the battery management unit 64, thereby maintaining the temperature of the battery management unit 64 within a reasonable range.

[0067] In some embodiments, the battery management unit assembly 6 includes a third bracket 63 and two battery management units 64; the two battery management units 64 are respectively connected to opposite sides of the third bracket 63, and the third bracket 63 is connected to the housing 1. Thus, in this embodiment, the two battery management unit assemblies 6 are connected to the same third bracket 63, reducing the use of brackets and lowering costs.

[0068] Reference Figure 4 In some embodiments, the housing 1 includes a cover 11 and a base 12, with the bottom of the cover 11 detachably connected to the base 12. A top plate 111 is located on one side of the cover 11, and the cover 11 has an inner cavity for accommodating a battery module 2, which is located in the inner cavity and connected to the base 12. Thus, the detachable connection between the bottom of the cover 11 and the base 12 facilitates inspection or maintenance of the interior of the housing 1. Specifically, the cover 11 and the base 12 can be screwed together, and a sealing gasket can be provided between the cover 11 and the base 12 to reduce the entry of moisture, dust, and other contaminants through the gap between the cover 11 and the base 12.

[0069] In this application, the battery pack 100 can use a cold plate liquid cooling system to achieve heat transfer and temperature control. The cold plate is in contact with the battery module 2 and heat is transferred through the cold plate. When the heat of the battery module 2 is transferred to the cold plate, the coolant in the cold plate will absorb the heat and carry it away through the circulation system.

[0070] In some embodiments, the battery pack 100 further includes a liquid cooling pipe interface 9, which is used to connect to an external liquid cooling pipe and is connected to a cooling plate. The base 12 includes a mounting portion 121, which protrudes from the top plate 111 on the side opposite to the battery module 2, and the liquid cooling pipe interface 9 is connected to the mounting portion 121. Thus, the protruding mounting portion 121 facilitates the connection of the liquid cooling pipe interface 9 to the external liquid cooling pipe and provides more operating space.

[0071] In some embodiments, the battery pack 100 further includes a high-voltage connector assembly 8 and an explosion-proof valve 5; the fire-fighting device 4, battery management unit assembly 6, fuse 7, and high-voltage connector assembly 8 are all connected to the outside of the top plate 111 and located above the liquid cooling pipe interface 9. Thus, the fire-fighting device 4, battery management unit assembly 6, fuse 7, and high-voltage connector assembly 8 can fully utilize the space above the liquid cooling pipe interface 9, improving space utilization and making the battery pack 100 more compact. Specifically, the high-voltage connector assembly 8 of the battery pack 100 is responsible for connecting the battery module 2 to an external circuit to achieve power transmission. Specifically, the high-voltage connector assembly 8 includes a high-voltage socket, which is connected to the high-voltage output terminal of the battery module 2 and used to connect to the circuit of external electrical equipment. (Refer to...) Figure 4 The top plate 111 has a through hole 113 through which a connecting wire for connecting the high voltage connector to the battery module 2 passes.

[0072] In some embodiments, the top plate 111 has a through groove 112 that communicates with the interior of the housing 1. The housing 1 also includes a maintenance cover 13 detachably connected to the top plate 111. The maintenance cover 13 has an accommodating space, and the explosion-proof valve 5 is connected to the maintenance cover 13 and communicates with the accommodating space. The maintenance cover 13 covers the through groove 112, and the fire-fighting device 4, battery management unit assembly 6, and fuse 7 are located within the accommodating space. Since the fire-fighting device 4, battery management unit assembly 6, and fuse 7 typically only require disassembly or other operations when replacement or maintenance is needed, and do not require connection to external electrical equipment like the high-voltage connector assembly 8, the maintenance cover 13 is provided to protect the fire-fighting device 4, battery management unit assembly 6, and fuse 7, and to provide dust and water protection. The maintenance cover 13 can be screwed to the top plate 111, allowing maintenance personnel to quickly disassemble and reinstall the maintenance cover 13 when maintenance or replacement of internal components is required, thus improving maintenance efficiency.

[0073] Reference Figure 8 In some embodiments, the maintenance cover 13 protrudes from the top plate 111 by a distance between 15mm and 25mm.

[0074] Interference testing revealed that defining the distance D from which the maintenance cover 13 protrudes from the top plate 111 is 15mm ≤ D ≤ 25mm ensures sufficient internal space for the fire suppression system 4, battery management unit assembly 6, and fuse 7, while preventing external interference with the liquid cooling pipe interface 9 and providing ample assembly space. Therefore, a distance of 15mm-25mm from the maintenance cover 13 protruding from the top plate 111 represents the ideal design for both compactness and rational layout of the spacer structure.

[0075] The design of dimensional parameters according to the embodiments of this application is described below through comparative examples 3 to 4 and examples 6 to 10. The table below records the design of the distance by which the maintenance cover 13 protrudes from the top plate 111 in each example and comparative example. Specifically, for examples 6 to 10, the distance d1 between the maintenance cover 13 and the liquid cooling pipe interface 9, the distance d2 between the maintenance cover 13 and the liquid cooling pipe interface 9 along the length of the housing 1, and the distance d3 between the maintenance cover 13 and the liquid cooling pipe interface 9 along the height of the housing 1 are recorded respectively. The interference between the maintenance cover 13 and each component is also examined. Specific parameters are shown in Table 2.

[0076] Table 2

[0077]

[0078] In Example 9, refer to Figure 8 The maintenance cover 13 protrudes 22mm from the top plate 111 by a distance D. At this point, the closest distance d1 between the maintenance cover 13 and the liquid cooling pipe interface 9 is 9mm. Along the length of the enclosure 1, the distance d2 between the maintenance cover 13 and the liquid cooling pipe interface 9 is -2.7mm, and along the height of the enclosure 1, the distance d3 is 2.5mm. The negative value d2 can be interpreted as meaning that along the length of the enclosure 1, the maintenance cover 13 and the liquid cooling pipe interface 9 partially overlap, but due to the distances d1 and d2, there is sufficient space between them, preventing interference.

[0079] In the description of this application, 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 features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0081] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

[0083] Although this application has been specifically described above in conjunction with the accompanying drawings and embodiments, it is to be understood that the above description does not limit this application in any way. Those skilled in the art can make modifications and variations to this application as needed without departing from the essential spirit and scope of this application, and all such modifications and variations fall within the scope of this application.

Claims

1. A battery pack (100), characterized by, The battery pack (100) comprises: a box (1), the box (1) comprising a top plate (111) on one side of the box (1); a fuse (7) connected to the top plate (111); a fire extinguishing device (4) connected to the top plate (111), the fire extinguishing device (4) being used to release fire extinguishing agent by sensing temperature change; a battery management unit assembly (6) connected to the top plate (111) and located between the fire extinguishing device (4) and the fuse (7).

2. The battery pack (100) according to claim 1, characterized in that, The battery management unit assembly (6) comprises a first bracket (61), a second bracket (62) and two battery management units (64); The first bracket (61) is connected to the second bracket (62), and the first bracket (61) and the second bracket (62) have a containing space formed therebetween, and the first bracket (61) and / or the second bracket (62) is connected to the top plate (111); One of the battery management units (64) is connected to the side of the first bracket (61) away from the second bracket (62), and the other battery management unit (64) is connected to the second bracket (62) and located in the containing space.

3. The battery pack (100) according to claim 2, characterized in that, The second bracket (62) comprises a containing groove recessed away from the first bracket (61), and the containing groove forms the containing space; or The first bracket (61) comprises a containing groove recessed away from the second bracket (62), and the containing groove forms the containing space.

4. The battery pack (100) of claim 2, wherein, The first bracket (61) and / or the second bracket (62) is provided with a weight-reducing hole (65).

5. The battery pack (100) of claim 1, wherein, The battery management unit assembly (6) comprises a third bracket (63) and two battery management units (64); The two battery management units (64) are respectively connected to the opposite sides of the third bracket (63), and the third bracket (63) is connected to the box (1).

6. The battery pack (100) according to any one of claims 1-5, characterized in that, The battery pack (100) further comprises a battery module (2), the box (1) comprises a box cover (11) and a base (12), and the bottom of the box cover (11) is detachably connected to the base (12); The top plate (111) is located on one side of the box cover (11), the box cover (11) has an inner cavity for accommodating the battery module (2), and the battery module (2) is located in the inner cavity and connected to the base (12).

7. The battery pack (100) according to claim 6, characterized in that The battery pack (100) further comprises a liquid cooling pipe interface (9) for connecting an external liquid cooling pipe; The base (12) comprises a mounting portion (121) protruding from the side of the top plate (111) away from the battery module (2), and the liquid cooling pipe interface (9) is connected to the mounting portion (121).

8. The battery pack (100) according to claim 7, characterized in that The battery pack (100) further comprises a high-voltage connector assembly (8) and an explosion-proof valve (5); The fire extinguishing device (4), the battery management unit assembly (6), the fuse (7) and the high-voltage connector assembly (8) are all connected to the outer side of the top plate (111) and located above the liquid cooling pipe interface (9).

9. The battery pack (100) according to claim 8, characterized in that The top plate (111) is provided with a through groove (112) which is in communication with the inside of the box (1); The box (1) further comprises a maintenance cover (13) detachably connected with the top plate (111), the maintenance cover (13) is provided with a containing space, the explosion-proof valve (5) is connected with the maintenance cover (13) and is in communication with the containing space; The maintenance cover (13) covers the through groove (112), and the fire-fighting device (4), the battery management unit assembly (6) and the fuse (7) are located in the containing space.

10. The battery pack (100) according to claim 9, characterized in that, The distance between the maintenance cover (13) and the top plate (111) is between 15mm and 25mm.

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