Battery pack

Abstract

The present application describes a battery pack. The battery pack comprises: a case, and a separator and a fire protection device that are arranged inside the case, wherein the case comprises a top plate and a bottom plate that are arranged opposite each other; one end of the separator is connected to the top plate of the case, and there is a gap between the other end of the separator and the bottom plate; the fire protection device is connected to the top plate and located on one side of the separator; and the fire protection device can release a fire extinguishing agent to fill the interior of the case. The battery pack further comprises an explosion-proof valve, the explosion-proof valve being connected to the top plate and located on the side of the separator facing away from the fire protection device.

Description

battery pack

[0001] This application claims priority to Chinese Patent Application No. 202411639586.6, filed with the Chinese Patent Office on November 15, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0003] As a crucial core component in new energy equipment, the fire safety of batteries has attracted widespread attention. Battery systems can catch fire during operation due to various reasons, threatening not only personal safety but also potentially causing property damage and environmental pollution. Related technologies include installing fire-fighting devices within the battery pack to extinguish fires in the event of a battery fire. Invention Overview

[0004] However, this setup has the problem of insufficient fire suppression.

[0005] This application provides a battery pack that can improve the problem of insufficient fire extinguishing when a battery catches fire.

[0006] This application provides a battery pack comprising: a housing, an isolator and a fire-fighting device disposed inside the housing; the housing includes a top plate and a bottom plate disposed opposite to each other; one end of the isolator is connected to the top plate of the housing, and the other end of the isolator has a gap with the bottom plate; the fire-fighting device is connected to the top plate and located on one side of the isolator, and the fire-fighting device is capable of releasing a fire extinguishing agent to diffuse within the housing; the battery pack further includes an explosion-proof valve, which is connected to the top plate and located on the side of the isolator opposite to the fire-fighting device. Beneficial effects

[0007] The battery pack involved in this application includes a casing, multiple battery modules, an isolator, a fire suppression system, and an explosion-proof valve. The battery modules are housed within the casing. One end of the isolator has a gap with the base plate, through which the fire suppression system can release extinguishing agent to diffuse within the casing. Specifically, when a fire breaks out inside the battery pack, the fire suppression system releases the extinguishing agent, and the explosion-proof valve opens due to increased internal pressure to discharge the extinguishing agent and smoke. Due to the isolator, the extinguishing agent first diffuses within the casing on the side corresponding to the fire suppression system, and then diffuses through the gap to the side of the casing corresponding to the explosion-proof valve. Therefore, the extinguishing agent can fully diffuse within the casing before reaching the explosion-proof valve, allowing it to reach all areas of the multiple battery modules as comprehensively as possible for better fire suppression. Furthermore, the isolator also prolongs the time it takes for the extinguishing agent to be discharged from the explosion-proof valve, ensuring that the extinguishing agent can effectively extinguish the flames within the battery pack and reducing the probability of reignition. Attached Figure Description

[0008] Figure 1 is a schematic diagram showing the overall structure of the battery pack involved in this application;

[0009] Figure 2 is a partial structural schematic diagram of the battery pack involved in this application;

[0010] Figure 3 is a schematic diagram showing the release path of the fire extinguishing agent involved in this application inside the battery pack;

[0011] Figure 4 is an exploded view of the battery pack involved in this application;

[0012] Figure 5 is a schematic diagram of another partial structure of the battery pack involved in this application;

[0013] Figure 6 is a schematic diagram of another partial structure of the battery pack involved in this application;

[0014] Figure 7 is a partial cross-sectional view of the battery pack involved in this application;

[0015] Figure 8 is a side view of the battery pack involved in this application;

[0016] Figure 9 is a schematic diagram of another partial structure of the battery pack involved in this application;

[0017] Figure 10 is a schematic diagram of another partial structure of the battery pack involved in this application;

[0018] Figure 11 is a schematic diagram of another partial structure of the battery pack involved in this application.

[0019] 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. Embodiments of the present invention

[0020] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0023] Referring to 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 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.

[0024] According to the above structure, the battery module 2 of this application is located inside the housing 1. One end of the insulating member 3 has a gap with the bottom plate. Through this gap, 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 insulating member 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.

[0025] For ease of understanding, please refer to Figure 1. The 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 these possible implementations, the top plate 111 and the bottom plate 114 are distributed along the length direction of the housing 1.

[0026] Specifically, referring to Figure 3, due to the arrangement of the isolator 3, the path of the extinguishing agent after release and subsequent discharge can form a U-shape. The starting point of the U-shaped path is the fire-fighting device 4, and the ending point is 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 housing 1. In this way, the extinguishing agent can diffuse in zones on both sides of the isolator within the housing 1, extending the residence time of the extinguishing agent inside the housing 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.

[0027] 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.

[0028] In some possible implementations, along the height of the housing 1, the two ends of the isolator 3 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 from the upper and lower ends of the isolator 3, thus 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.

[0029] In some possible implementations, 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, resulting in a better fire extinguishing effect.

[0030] In some possible implementations, the number of battery modules 2 located on both sides of the separator 3 is equal. In these possible implementations, it can also be understood that they are 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.

[0031] Referring to Figure 5, in some examples, along the width direction of the housing 1, the plurality of 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.

[0032] In some possible implementations, 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 effectively surrounding the battery module 2 and improving 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.

[0033] In some possible implementations, the end of the isolator 3 facing the base plate 114 is on the same plane as the bottom surface. Understandably, this means the bottom surface and the end of the isolator 3 facing the base plate 114 are both on the same plane, and 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, resulting in higher extinguishing efficiency. In other possible implementations, 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.

[0034] 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.

[0035] In some possible implementations, an insulating element 14 can be provided on the inner wall of the housing 1. This insulating element 14 can be located in an area other than the top plate 111. In related technologies, since the battery pack 100 may be subjected to pressure from external objects 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 element provides an insulating layer, thereby enhancing the safety and reliability of the battery pack 100. Specifically, the insulating element 14 has a sheet-like structure and is attached to the inner wall of the housing 1. In some examples, both the insulating element 14 and the separator 3 can be made of polypropylene (PP), a good electrical insulating material. The insulating element 14 prevents contact between the battery module 2 and the housing 1, avoiding short circuits.

[0036] Referring to Figure 6, in some possible implementations, 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 components of the battery pack 100, and the edge of the first notch 31 is in contact with the outer contour of the avoided electronic component.

[0037] 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.

[0038] In some possible implementations, the separator 3 is provided with a second notch 32, which is used to avoid the protruding structure of the inner wall of the housing 1. Since the inner wall of the housing 1 is usually not completely flat, as shown in Figure 4, a protruding crossbeam 15 is provided at the bottom of the housing 1. The crossbeam 15 is used for connecting and fixing 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 extinguishing agent passing through the second notch 32.

[0039] Referring to Figure 7, in some possible implementations, the isolator 3 includes a side facing the fire-fighting device 4 or the explosion-proof valve 5, a first space facing the fire-fighting device 4 separated by the isolator 3 within the housing 1, and a second space facing the explosion-proof valve 5; a total channel for the extinguishing agent to flow from the first space to the second space is formed between the edge of the isolator 3 and the inner wall of the housing 1, and the area of ​​the total channel on the plane containing the side is S1; the channel formed by the end face of the isolator 3 facing the bottom plate and the inner wall of the housing 1 is the design channel, and 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 isolator 3, and the fact that the inner wall of the housing 1 is usually not completely flat, the extinguishing agent will also pass through the gap between the isolator 3 and the electronic device, and also through the gap between the isolator 3 and the inner wall of the housing 1. These gaps, together with the design channel, form the total channel, except for the design channel used for the passage of the extinguishing agent. 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 it 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 through the explosion-proof valve 5, allowing it to fully extinguish the flames within the battery pack 100 and reducing the probability of reignition.

[0040] 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.

[0041] 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.

[0042]

[0043] 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.

[0044] In some possible implementations, 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 can form 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.

[0045] In some other possible implementations, the spacer 3 can also abut against the inner wall of the housing 1. Specifically, since the spacer 3 is located between two adjacent battery modules 2, it 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.

[0046] 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.

[0047] In some possible implementations, 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.

[0048] In some possible implementations, the separator 3 has a plate-like structure with a thickness between 2mm and 5mm. In some examples, the thickness of the separator 3 can be one of 2mm, 3mm, 3.5mm, 4mm, or 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 due to 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.

[0049] In some possible implementations, the battery pack 100 is a sodium-ion battery pack 100. Therefore, the battery pack 100 of this application uses sodium ions as the charge carrier. Sodium is more abundant on Earth than lithium, easier to obtain, has lower raw material costs, and lower manufacturing costs.

[0050] Referring to Figure 2, in some possible implementations, the battery pack 100 also 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.

[0051] 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.

[0052] 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 some possible implementations, a thermistor is extended from the fire suppression system 4 and positioned near the explosion-proof valve of each battery cell. Upon thermal runaway, the fire suppression system 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 suppression system 4 to release extinguishing agent to cool the interior of the battery pack 100 and isolate it from oxygen.

[0053] Referring to Figures 4 to 11, in some possible implementations, 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, in the thickness direction of the battery management units 64, the two battery management units 64 are overlapped, 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. In these possible implementations, two battery management units 64 can be used, 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.

[0054] 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.

[0055] In some possible implementations, the second bracket 62 includes a recessed receiving groove that extends 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 connected by screws, and the second bracket 62 is screwed to the top plate 111.

[0056] In some other possible implementations, 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.

[0057] Referring to Figures 10 and 11, the 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.

[0058] In some possible implementations, 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 these possible implementations, the two battery management unit assemblies 6 are connected to the same third bracket 63, reducing the use of brackets and lowering costs.

[0059] Referring to Figure 4, in some possible implementations, 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 the 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.

[0060] 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.

[0061] In some possible implementations, the battery pack 100 also 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.

[0062] In some possible implementations, the battery pack 100 also 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. 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. Referring 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.

[0063] In some possible implementations, the top plate 111 has a through groove 112 that communicates with the interior of the enclosure 1. The enclosure 1 also includes a maintenance cover 13 detachably connected to the top plate 111. The maintenance cover 13 has a receiving space, and the explosion-proof valve 5 is connected to the maintenance cover 13 and communicates with the receiving space. The maintenance cover 13 closes to the through groove 112, and the fire-fighting device 4, battery management unit assembly 6, and fuse 7 are located within the receiving 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.

[0064] Referring to Figure 8, in some possible implementations, the maintenance cover 13 protrudes from the top plate 111 by a distance between 15mm and 25mm.

[0065] 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.

[0066] 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.

[0067]

[0068] In embodiment 9, referring to Figure 8, the distance D by which the maintenance cover 13 protrudes from the top plate 111 is 22mm. At this time, the closest distance d1 between the maintenance cover 13 and the liquid cooling pipe interface 9 is 9mm. The distance d2 between the maintenance cover 13 and the liquid cooling pipe interface 9 along the length of the housing 1 is -2.7mm, and the distance d3 between the maintenance cover 13 and the liquid cooling pipe interface 9 along the height of the housing 1 is 2.5mm. The negative value d2 can be understood as meaning that, along the length of the housing 1, the positions of the maintenance cover 13 and the liquid cooling pipe interface 9 partially overlap. However, due to the settings of distances d1 and d2, there is sufficient space between the maintenance cover 13 and the liquid cooling pipe interface 9, therefore, they will not interfere with each other.

Claims

1. A battery pack (100), comprising: The enclosure (1) includes an isolation component (3) and a fire-fighting device (4) disposed inside the enclosure (1). The enclosure (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), 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 located on one side of the isolation member (3). The fire-fighting device (4) can release extinguishing agent to diffuse into the box (1). The battery pack (100) also includes an explosion-proof valve (5), which is connected to the top plate (111) and located on the side of the isolation member (3) away from the fire-fighting device (4).

2. The battery pack (100) of claim 1, wherein, Along the height direction of the box (1), the two ends of the isolation member (3) abut against the inner wall of the box (1).

3. The battery pack (100) according to claim 1, the battery pack (100) further includes a plurality of battery modules (2), the battery modules (2) are disposed in the housing (1), and the separator (3) is located between two adjacent battery modules (2).

4. The battery pack (100) of claim 3, wherein, The number of battery modules (2) located on both sides of the separator (3) is equal.

5. The battery pack (100) of claim 3, wherein, The battery module (2) includes a bottom surface facing the base plate (114), and there is a gap between the bottom surface and the base plate (114).

6. The battery pack (100) of claim 5, wherein, The end of the spacer (3) facing the base plate (114) is on the same plane as the bottom surface; or, The bottom surface is located between the end of the separator (3) facing the bottom plate (114) and the bottom plate (114).

7. The battery pack (100) according to any one of claims 1-6, wherein, The isolation member (3) is provided with a first notch (31), which is located at one end of the isolation member (3) facing the top plate (111) and is configured to avoid the electronic components of the battery pack (100), and the edge of the first notch (31) is in contact with the outer contour of the avoided electronic components.

8. The battery pack (100) according to any one of claims 1-6, wherein, The isolation element (3) is provided with a second notch (32), which is configured to avoid the protruding structure of the inner wall of the housing (1).

9. The battery pack (100) according to any one of claims 1-6, wherein, The isolation element (3) includes a side facing the fire-fighting device (4) or the explosion-proof valve (5), a first space facing the fire-fighting device (4) and a second space facing the explosion-proof valve (5) separated by the isolation element (3) inside the housing (1); The edge of the isolation element (3) and the inner wall of the box (1) form a total channel for the extinguishing agent to travel from the first space to the second space, and the area of ​​the total channel on the plane of the side is S1; The channel formed by the end face of the isolation component (3) facing the bottom plate (114) and the inner wall of the box (1) is the design channel, and the area of ​​the design channel on the plane where the side is located is S2; Among them, S2 / S1≥80%.

10. The battery pack (100) according to any one of claims 1-6, wherein, Along the height direction of the housing (1), the separator (3) protrudes from the surface of the battery module (2), and the protrusion height is between 8mm and 22mm.

11. The battery pack (100) according to any one of claims 1-6, wherein, The spacer (3) is adhered to the inner wall of the housing (1); and / or, The isolation element (3) has a plate-like structure and the thickness of the isolation element (3) is between 2mm and 5mm.

12. The battery pack (100) according to any one of claims 1-6, wherein the battery pack (100) further comprises a battery management unit assembly (6) and a fuse (7); The battery management unit assembly (6) and the fuse (7) are both 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 configured to release extinguishing agent by sensing temperature changes.

13. The battery pack (100) according to any one of claims 1-6, wherein the battery pack (100) is a sodium-ion battery pack (100).

Images