Battery pack and powered device

Abstract

The present disclosure provides a battery pack and an electrical device. The battery pack comprises a box, a plurality of batteries, a protection box and a BMS. The box is internally provided with a partition beam for partitioning the internal space of the box into a battery compartment and an electrical compartment. The plurality of batteries are arranged in the battery compartment. The protection box is arranged in the electrical compartment and is internally provided with a receiving cavity and is externally provided with a window. The BMS is arranged in the protection box and is provided with a sensing module for sensing a target gas entering the protection box through the window. Accordingly, by integrating the sensing module on the BMS, the overall volume of the sensing module and the BMS can be reduced, and thus the overall volume of the battery pack can be reduced. The sensing module is used for sensing the target gas entering the protection box through the window, and the function of the sensing module does not overlap with the BMS, which can avoid wasting hardware resources and reduce production costs. In addition, the target gas can enter the protection box through the window, which enables the sensing module to timely sense the target gas, and thus enables the BMS to respond in a timely manner.

Description

Technical Field

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

[0002] Thermal runaway can occur in batteries under abnormal conditions such as overheating or internal short circuits. It is the most serious safety malfunction in battery systems, causing the battery to bulge, catch fire, or even explode. Therefore, timely and reliable detection of early signs of thermal runaway is crucial for ensuring personal safety.

[0003] In traditional battery packs, modular thermal runaway sensors are typically used for thermal runaway safety monitoring. These sensors integrate various sensors and signal processing circuits, and can interact with the Battery Management System (BMS) via communication methods such as CAN bus to report alarm information. However, these modular thermal runaway sensors are complex in design and have high production costs. Secondly, their internal signal processing functions overlap with the BMS, resulting in wasted hardware resources. Furthermore, these thermal runaway sensors require installation space, increasing the overall size of the battery pack. Utility Model Content

[0004] In view of this, the present disclosure provides a battery pack to at least solve or improve the problems of high production cost, large space occupation, and waste of hardware resources due to functional redundancy of thermal runaway sensors in previous battery packs.

[0005] The battery pack includes a housing, multiple batteries, a protection box, and a BMS. The housing has an internal partition beam that divides the interior space into a battery compartment and an electrical compartment. The batteries are arranged within the battery compartment. The protection box is located within the electrical compartment and has an internal cavity with a window. The BMS is located within the protection box and includes a sensing module used to detect target gas entering the protection box through the window.

[0006] In this disclosure, by integrating the sensing module onto the BMS, the overall size of both the sensing module and the BMS can be reduced, resulting in a more compact battery pack and a smaller overall battery pack size. Secondly, the sensing module is used to sense the target gas entering the protective box through the window; its function does not overlap with the BMS, thus avoiding wasted hardware resources and reducing production costs. Furthermore, the target gas can enter the protective box through the window, allowing the sensing module to detect the target gas arriving at the protective box in a timely manner, enabling the BMS to respond promptly.

[0007] This disclosure also provides an electrical device that includes the battery pack described above. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic cross-sectional view of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 This is a schematic diagram of the structure of a battery pack according to another embodiment of the present disclosure.

[0013] Figure 3 This is a schematic diagram of the structure of a battery pack according to another embodiment of the present disclosure.

[0014] Figure 4 This is a schematic diagram of the structure of a battery pack according to another embodiment of the present disclosure.

[0015] Figure 5 This is a schematic diagram of the structure of a battery pack according to another embodiment of the present disclosure.

[0016] Figure 6 This is a schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0017] Figure 7 This is a schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0018] Figure 8 This is a schematic cross-sectional view of a battery pack according to another embodiment of the present disclosure.

[0019] Figure 9 for Figure 1 A schematic diagram of the protective box in the diagram.

[0020] Figure 10 for Figure 1 A schematic diagram of the structure of the protective box in another embodiment.

[0021] Figure 11 for Figure 1 A schematic diagram of the structure of the protective box in another embodiment.

[0022] Figure 12 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0023] Figure Labels

[0024] Battery pack-100; Battery-10; Housing-20; Battery compartment-21; Electrical compartment-22; Separator beam-23; Support plate-24; Opening-241; Base plate-25; Side beam-26; First opening-261; Second opening-262; Exhaust channel-27; Protection box-30; Windows-32, 32a, 32b; BMS-33; Electrical equipment-200. Detailed Implementation

[0025] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0026] <Example Battery Pack>

[0027] refer to Figure 1 According to an embodiment of this disclosure, a battery pack 100 may include a battery group composed of multiple batteries 10 connected in series and parallel, and integrates a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. The battery pack 100 may also include a housing 20, within which the aforementioned components are housed. The housing 20 effectively prevents external collisions, compression, and vibrations from affecting the batteries, battery management system (BMS), thermal management system, and other components inside the housing 20. Furthermore, the housing prevents external moisture or dust from entering the housing. The housing 20 can be sealed with a top cover, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a rechargeable battery and a power source for new energy vehicles, primarily used for storing and providing electrical energy.

[0028] A Battery Management System (BMS) is a system used to monitor and manage the operation of a battery pack. It integrates sensors, control units, and actuators to monitor key parameters such as battery voltage, current, and temperature in real time, and performs dynamic control and optimization based on this data. The BMS is primarily used to ensure battery safety (such as preventing overcharging, over-discharging, and overheating), optimize charge and discharge performance, and extend battery life. It is an indispensable key component in applications such as electric vehicles and energy storage systems. Furthermore, the BMS33 is electrically connected to the battery pack, responsible for real-time acquisition of key data such as battery voltage, temperature, and current, performing state calculations and logical judgments, and executing core commands such as battery protection, battery balancing, and external communication.

[0029] The housing 20 has a partition beam 23 inside, dividing the internal space of the housing 20 into a battery compartment 21 and an electrical compartment 22. The battery pack 100 may also include multiple batteries 10, which are arranged within the battery compartment 21. The battery 10 is the basic energy storage unit in the battery pack 100, used to store and release electrical energy, and can convert chemical energy into electrical energy (discharging process) or store electrical energy as chemical energy (charging process) through internal chemical reactions. In the battery pack 100, multiple batteries 10 can be electrically connected in series or parallel to meet different voltage, capacity, and power requirements. In some embodiments, the battery 10 is a prismatic battery. In other embodiments, the battery 10 is a cylindrical battery. In other embodiments, the battery 10 is a pouch battery. In other embodiments, the battery 10 may also be other types of batteries. This disclosure does not limit the type of battery.

[0030] Under abnormal conditions, the battery pack 100 may experience thermal runaway, which occurs when a short circuit, overcharging, or high temperature triggers a chain reaction of exothermic reactions within the battery 10, causing a rapid rise in temperature and loss of control. Thermal runaway not only damages the battery 10 but may also lead to safety accidents. Furthermore, when thermal runaway occurs in the battery 10, a series of reactions occur within the battery 10, generating and releasing a large amount of target gases. These target gases may include, but are not limited to, one or more components such as carbon monoxide, carbon dioxide, hydrogen, smoke, methane, and ethylene. These target gases can serve as important characteristics for determining the occurrence of thermal runaway; this disclosure does not specifically limit the types of target gases produced.

[0031] The battery pack 100 may also include conductive elements. The conductive elements can electrically connect the terminals of at least two batteries 10, i.e., the current output terminals of the batteries 10, to realize the series or parallel connection of multiple batteries 10.

[0032] The battery pack 100 may also include a battery array. The battery array can be formed by connecting multiple batteries 10 with similar capacity and internal resistance. For example, multiple batteries 10 can be connected in series to form a battery array, or multiple batteries 10 can be connected in parallel to form a battery array, or a portion of multiple batteries 10 can be connected in series and another portion can be connected in parallel to form a battery array.

[0033] The battery pack 100 may also include a protective box 30. The protective box 30 is disposed within the electrical compartment 22, and has an internal receiving cavity with a window 32 on its surface. The battery pack 100 may also include components such as a BMS 33 and a sensing module. The BMS 33 and the sensing module are located within the protective box 30. The sensing module is used to sense the target gas entering the protective box 30 through the window 32.

[0034] Based on the above structure, the partition beam 23 can separate the battery compartment 21 and the electrical compartment 22. When a battery 10 in the battery compartment 21 experiences thermal runaway, it can delay and prevent the impact on components such as the BMS33 in the electrical compartment 22. The protective box 30 can provide protection for its internal components such as the BMS33, effectively preventing small particles and other substances from affecting the BMS33 and other components. By integrating the sensing module onto the BMS33, the overall volume of the sensing module and the BMS33 can be reduced, making the battery pack 100 more compact and reducing the overall volume of the battery pack 100. Secondly, the sensing module is used to sense the target gas entering the protective box 30 through the window 32. Its function does not overlap with that of the BMS33, which can avoid wasting hardware resources and reduce production costs. In addition, the target gas can enter the protective box 30 through the window 32 on the protective box 30, which allows the sensing module to sense the target gas delivered to the protective box 30 in a timely manner, so that the BMS33 can respond in a timely manner. To illustrate, when the sensing module detects the target gas, it transmits the detected signal to the BMS33. The BMS33 then issues a warning or fault alarm, thereby reminding the operator to take appropriate measures.

[0035] refer to Figure 2 Window 32 is located on the top wall of the protective box 30. For ease of description, in the accompanying drawings of this disclosure, Y is used to indicate the height direction of the partition beam 23.

[0036] Since the density of the target gas is typically lower than that of air, the target gas generated after thermal runaway of multiple batteries 10 usually diffuses upwards. Furthermore, in some embodiments, the vents of the multiple batteries 10 are located near the top of the housing 20. During thermal runaway, the multiple batteries 10 release the target gas through the vents at the top of the housing 20. The target gas can enter the electrical compartment 22 from the battery compartment 21 via the top of the partition beam 23. By providing a window 32 in the top wall of the protective housing 30, the target gas can enter the protective housing 30 more quickly through the window 32, enabling the sensing module to detect the target gas promptly, thus allowing the BMS 33 to respond in a timely manner.

[0037] Continue to refer to Figure 2 The top of the partition beam 23 has a recess extending transversely along the partition beam, and the recess is aligned with the window 32 transversely along the partition beam 23. The transverse direction of the partition beam is from the battery compartment to the electrical compartment. For ease of description, in the accompanying drawings of this disclosure, H is used to indicate the transverse direction of the partition beam 23.

[0038] By providing a transversely penetrating notch at the top of the partition beam 23, a directional path is provided for the target gas, preventing its disorderly diffusion within the battery compartment 21. This ensures the target gas is concentrated and enters the electrical compartment 22 through the notch, guaranteeing that the sensing module can detect a high concentration of the target gas. The notch and window 32 are aligned transversely with the partition beam 23, ensuring that after entering the electrical compartment 22 through the notch, the target gas can promptly and accurately enter the protective box 30 through the window 32. This allows the sensing module to detect the target gas promptly and accurately and transmit the signal to the BMS 33, enabling the BMS 33 to respond in a timely manner.

[0039] In another embodiment, reference Figure 3 Window 32 is located on one side of the protective box 30 along the longitudinal direction of the partition beam 23. For ease of description, in the accompanying drawings of this disclosure, Z is used to indicate the longitudinal direction of the partition beam 23.

[0040] The space between the side wall of the protective box 30 and the side wall of the facing housing 20 is relatively large, which can provide a large flow cross-sectional area for the target gas and reduce flow resistance. The window 32 is located on one side wall of the protective box 30 along the longitudinal direction of the partition beam 23. The target gas can smoothly enter the protective box 30 through the window 32. This effectively prevents the target gas from accumulating outside the protective box 30 due to excessive flow resistance, which would prevent the sensing module from detecting the target gas in time and thus prevent the BMS33 from responding promptly.

[0041] In another embodiment, reference Figure 4 Window 32 is located on the front wall of the protective box 30 facing the partition beam 23.

[0042] Because the front wall of the protective box 30 facing the partition beam 23 is relatively close to the partition beam 23, the window 32 is located on the front wall of the protective box 30 facing the partition beam 23. This shortens the path for the target gas to enter the protective box 30 from the battery compartment 21. This ensures that the target gas enters the protective box 30 quickly, while also minimizing concentration loss upon entering the protective box 30, allowing the sensing module to detect the target gas more accurately.

[0043] Continue to refer to Figure 4 The top of the partition beam 23 has a recess that runs horizontally through it, and the orthographic projection of the recess on the front box wall at least partially overlaps with the window 32.

[0044] By providing a transversely penetrating notch at the top of the partition beam 23, a directional path is provided for the target gas, preventing its disorderly diffusion within the battery compartment 21. This ensures the target gas is concentrated and enters the electrical compartment 22 through the notch, guaranteeing that the sensing module can detect a higher concentration of the target gas. The orthographic projection of the notch onto the front wall of the housing at least partially overlaps with the window, ensuring that after entering the electrical compartment 22 through the notch, the target gas can promptly and accurately enter the protective housing 30 through the window 32. This ensures that the sensing module can promptly detect the target gas and transmit the signal to the BMS, enabling the BMS to respond in a timely manner.

[0045] In another embodiment, reference Figure 5 The partition beam 23 is provided with a through hole that extends laterally therethrough, and the orthographic projection of the through hole on the front box wall at least partially overlaps with the window.

[0046] By providing a through hole running transversely through the partition beam 23, a directional path is provided for the target gas, preventing its disorderly diffusion within the battery compartment 21. This allows the target gas to concentrate and enter the electrical compartment 22 through the notch, ensuring that the sensing module can detect a higher concentration of the target gas. The orthographic projection of the through hole onto the front wall of the housing at least partially overlaps with the window, ensuring that after entering the electrical compartment 22 through the notch, the target gas can promptly and accurately enter the protective box 30 through the window 32. This ensures that the sensing module can promptly detect the target gas and transmit the signal to the BMS 33, enabling the BMS 33 to respond in a timely manner.

[0047] In another embodiment, reference Figure 6 Window 32 is located on the rear wall of the protective box 30, opposite to the partition beam 23.

[0048] According to the above structure, after the target gas enters the electrical chamber 22, it will not directly enter the protective box 30 through the window 32. Instead, the target gas will flow to the rear wall of the box and enter the protective box 30 through the window 32. This process allows the target gas concentration distribution to become more uniform, resulting in a more stable signal sensed by the sensing module and preventing the BMS from making erroneous responses due to a sudden increase in the target gas concentration. Furthermore, the protective box 30 can prevent the target gas from directly entering the protective box 30 through the window 32, avoiding direct impact from the target gas on components such as the BMS 33 within the protective box 30, thus preventing any impact on the performance of these components.

[0049] Continue to refer to Figure 6The housing 20 includes a support plate 24, a bottom plate 25, and a side beam 26. The support plate 24 is located below and supports the plurality of batteries 10. The bottom plate 25 is located below the support plate 24 and forms an exhaust channel 27 between the bottom plate 25 and the support plate 24. The side beam 26 is located on the side of the protective housing 30 facing away from the partition beam 23, and the side beam 26 has a first opening 261 and a second opening 262 that are connected. The first opening 261 communicates with the exhaust channel 27, and the second opening 262 is located on the surface of the side beam 26 facing the rear wall of the housing. The orthographic projection of the second opening 262 on the rear wall of the housing at least partially overlaps with the window 32. In some embodiments, the discharge ports of the plurality of batteries 10 are located at one end near the bottom of the housing 20. In the event of thermal runaway, the plurality of batteries 10 can discharge ejected material to the bottom of the housing 20, i.e., to the exhaust channel 27. By placing the exhaust channel 27 below the multiple batteries 10, the ejected materials emitted during thermal runaway of the multiple batteries 10 can be promptly discharged into the exhaust channel 27, thereby ensuring timely discharge of the ejected materials through the exhaust channel 27. The ejected materials emitted during thermal runaway of the multiple batteries 10 include, but are not limited to, target gases.

[0050] According to the above structure, the target gas in the emission channel 27 can enter the channel between the side beam 26 and the side wall of the housing 20 through the first opening 261, then enter the electrical compartment 22 through the second opening 262, and finally enter the protective box 30 through the window 32. The orthographic projection of the second opening 262 on the rear box wall at least partially overlaps with the window 32, which can ensure that after the target gas enters the electrical compartment 22 through the second opening 262, it can enter the protective box 30 in a timely and accurate manner through the window 32, ensuring that the sensing module can detect the target gas in a timely manner and transmit the signal to the BMS33, so that the BMS33 can respond in a timely manner.

[0051] In another embodiment, reference Figure 7 Window 32 is located on the bottom wall of the protective box 30.

[0052] According to the above structure, after the target gas enters the electrical chamber 22, it will not directly enter the protective box 30 through the window 32. Instead, the target gas will flow to the bottom wall of the box and enter the protective box 30 through the window 32. This process allows the target gas concentration distribution to become more uniform, resulting in a more stable signal sensed by the sensing module and preventing the BMS33 from making erroneous responses due to a sudden increase in the target gas concentration. Furthermore, the protective box 30 can prevent the target gas from directly entering the protective box 30 through the window 32, avoiding direct impact from the target gas on components such as the BMS33 inside the protective box 30, thus preventing any impact on the performance of these components.

[0053] Continue to refer to Figure 7The housing 20 includes a support plate 24 and a base plate 25. The support plate 24 is located below and supports the plurality of batteries 10. The base plate 25 is located below the support plate 24 and forms an exhaust channel 27 between the base plate 25 and the support plate 24. The support plate 24 has an opening 241, the orthographic projection of which onto the bottom wall of the housing at least partially overlaps with a window. In some embodiments, the exhaust ports of the plurality of batteries 10 are located at one end near the bottom of the housing 20. When the plurality of batteries 10 experience thermal runaway, they discharge ejected material into the exhaust channel 27. By positioning the exhaust channel 27 below the plurality of batteries 10, the ejected material discharged during thermal runaway of the plurality of batteries 10 can be discharged into the exhaust channel 27 in a timely manner, thereby ensuring timely discharge of the ejected material through the exhaust channel 27. The ejected material discharged during thermal runaway of the plurality of batteries 10 includes, but is not limited to, target gases.

[0054] According to the above structure, the target gas in the emission channel 27 can enter the electrical compartment 22 through the opening 241, and then enter the protective box 30 through the window 32. In addition, the orthographic projection of the opening 241 on the bottom wall of the box at least partially overlaps with the window, which can ensure that after the target gas enters the electrical compartment 22 through the opening 241, it can enter the protective box 30 in a timely and accurate manner through the window 32. This ensures that the sensing module can detect the target gas in a timely manner and transmit the signal to the BMS, so that the BMS can respond in a timely manner.

[0055] In one embodiment, the protective box 30 is provided with a plurality of windows 32, which are located on a plurality of different boxes of the protective box 30.

[0056] By providing windows 32 on multiple different walls of the protective box 30, it can be ensured that the target gas can quickly enter the protective box 30 through at least one window 32. The sensing module can detect the target gas in a timely and accurate manner, thereby enabling the BMS 33 to respond promptly. Furthermore, multiple windows 32 can enhance the overall structural reliability. Specifically, even if some windows 32 are accidentally blocked, the other windows 32 can still function normally, ensuring that the target gas can enter the protective box 30 through the windows 32.

[0057] In another embodiment, reference Figure 8 The multiple windows 32 include two windows 32a and 32b, which are located on two opposite walls of the protective box.

[0058] By placing two windows 32a and 32b on opposite walls of the protective box 30, convection can be formed between the two windows 32a and 32b, allowing the target gas to be quickly introduced into the protective box 30. This enables the sensing module to detect the target gas promptly, allowing the BMS33 to respond in a timely manner.

[0059] Continue to refer to Figure 8Two windows, 32a and 32b, are respectively located on the two opposite box walls of the protective box 30 along the longitudinal direction of the partition beam 23.

[0060] The large space between the two opposing box walls along the longitudinal direction of the partition beam 23 and the side wall of the facing box 20 provides a large flow cross-sectional area for the target gas, resulting in low flow resistance. By placing two windows 32a and 32b on the opposing box walls of the protective box 30 along the longitudinal direction of the partition beam 23, the target gas can enter the protective box 3 more smoothly and quickly through the windows 32, thereby ensuring that the sensing module can detect the target gas in a timely manner, enabling the BMS to respond promptly.

[0061] In another embodiment, reference Figure 8 The housing 20 may include two side beams 231 and 232 connected to both ends of the partition beam 23, respectively. The distances from the protective box 30 to the two side beams 231 and 232 along the longitudinal direction of the partition beam 23 are D1 and D2, respectively, in mm, where 0.5 ≤ D1 / D2 ≤ 2. Preferably, 0.62 ≤ D1 / D2 ≤ 1.7. More preferably, 0.9 ≤ D1 / D2 ≤ 1.4. Alternatively, the ratio D1 / D2 may also be 0.75, 0.85, 0.95, 1, 1.1, 1.25, 1.37, 1.6, 1.8, or 1.9. The distance D1 from the protective box 30 to the side beam 231 along the longitudinal direction of the partition beam 23 satisfies: 600mm ≤ D1 ≤ 1200mm, and the distance D2 from the protective box 30 to the side beam 231 along the longitudinal direction of the partition beam 23 satisfies: 600mm ≤ D1 ≤ 1200mm.

[0062] If the ratio D1 / D2 is too large or too small, meaning the distance from the protective box 30 to one side beam is too large and the distance to the other side beam is too small, the impact force on different parts of the protective box 30 will be uneven when the target gas impacts. Furthermore, because the distance from the box wall where the window 32 is located to one side beam is too small, the flow resistance is too high when the target gas enters the protective box 30 through the window 32. Within the range of 0.7 ≤ D1 / D2 ≤ 1.4, the protective box 30 is approximately located in the middle region between the two side beams 231 and 232. This reduces the flow resistance when the target gas enters the protective box 30 through the window 32, allowing the target gas to enter the protective box 30 more smoothly, thus enabling the sensing module to detect the target gas in a timely manner.

[0063] In some embodiments, window 32 can be fully open. In another embodiment, refer to... Figure 9 The window 32 is provided with a grille 321. In some examples, the grille 321 can be an additional layer of grille added at the location of the window 32. In other examples, the grille 321 can be made by processing the box wall where the window 32 is located to have a filtering function during manufacturing.

[0064] By providing a grille 321 on the window 32, it is possible to effectively prevent solid foreign objects from entering the protective box 30 through the window 32 and affecting components such as the BMS, while ensuring the passage of the target gas. In some embodiments, the grille 321 is mesh-like. In other embodiments, the grille 321 is honeycomb-like. In other embodiments, the grille 321 is upright strips. In other embodiments, the grille 321 may also be other shapes. This disclosure does not limit its shape.

[0065] In another embodiment, reference Figure 10 A filter screen 322 is provided on the window 32. In some examples, the filter screen 322 can be an additional filter screen added at the location of the window 32. In other examples, the filter screen 322 can be made by processing the box wall where the window 32 is located to have a filtering function during manufacturing.

[0066] The filter 322 is porous and breathable, and its material can be glass fiber, ceramic fiber, waterproof and breathable membrane, etc. After the battery 10 experiences thermal runaway, in addition to the target gas, particulate matter or electrolyte may also be generated. By providing a filter 322 on the window 32, particulate matter or electrolyte can be prevented from entering the protection box 30 and affecting components such as the BMS. Simultaneously, it ensures that the target gas can enter the protection box 30 through the window 32. In some embodiments, the filter 322 is mesh-like. In other embodiments, the filter 322 is honeycomb-like. In still other embodiments, the filter 322 can also be other shapes. This disclosure does not limit its shape.

[0067] refer to Figure 11 The area of ​​window 32 is S1, in mm. 2 The area of ​​the box wall containing window 32 is S2, in mm. 2 The ratio S1 / S2 is 0.05 ≤ S1 / S2 ≤ 0.93. Preferably, it is 0.25 ≤ S1 / S2 ≤ 0.75. More preferably, it is 0.45 ≤ S1 / S2 ≤ 0.55. Alternatively, the ratio S1 / S2 can also be 0.15, 0.35, 0.6, 0.75, or 0.85. The area S1 of window 32 satisfies: 25 mm². 2 ≤S1≤90000mm 2 The area S2 of the box wall containing window 32 satisfies: 2500mm² 2 ≤S2≤96100mm 2 .

[0068] If the ratio S1 / S2 is too small (i.e., S1 is too small and S2 is too large), meaning window 32 is too small, the flow resistance when the target gas enters the protective box 30 through window 32 will be too high, preventing the target gas from entering the protective box 30 in a timely manner. Consequently, the sensing module and BMS will not be able to respond promptly. If the ratio S1 / S2 is too large (i.e., S1 is too large and S2 is too small), meaning window 32 is too large, the structural strength of the box wall where window 32 is located will decrease. Within the reasonable range of 0.05 ≤ S1 / S2 ≤ 0.95, the target gas has low flow resistance only when entering the protective box 30 through window 32, allowing the target gas to enter the protective box 30 quickly. This enables the sensing module and BMS 33 to respond promptly. In addition, the box wall where window 32 is located has high structural strength.

[0069] This disclosure also provides an electrical device 200, which may include the battery pack 100 described above.

[0070] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0071] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0072] In a non-restrictive example, refer to Figure 12 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to power the electric vehicle.

[0073] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0074] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0075] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first opening and a second opening), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0076] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0077] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The housing has internal partition beams that divide the interior space of the housing into a battery compartment and an electrical compartment; Multiple batteries are arranged inside the battery compartment; A protective box is arranged inside the electrical compartment, which has an internal receiving cavity and a window on its surface; as well as The BMS is located inside the protective box and is equipped with a sensing module. The sensing module is used to sense the target gas entering the protective box through the window.

2. The battery pack according to claim 1, characterized in that, The window is located on the top wall of the protective box.

3. The battery pack according to claim 2, characterized in that, The top of the partition beam has a recess that extends laterally through the partition beam, and the recess is aligned with the window in the lateral direction of the partition beam.

4. The battery pack according to claim 1, characterized in that, The window is located on one side of the protective box along the longitudinal direction of the partition beam.

5. The battery pack according to claim 1, characterized in that, The window is located on the front wall of the protective box facing the partition beam.

6. The battery pack according to claim 5, characterized in that, The top of the partition beam has a recess that extends laterally through the partition beam, and the orthographic projection of the recess on the front box wall at least partially overlaps with the window.

7. The battery pack according to claim 5, characterized in that, The partition beam has a through hole extending laterally therethrough, the orthographic projection of which on the front box wall at least partially overlaps with the window.

8. The battery pack according to claim 1, characterized in that, The window is located on the rear wall of the protective box, opposite to the partition beam.

9. The battery pack according to claim 8, characterized in that, The enclosure includes a support plate, a bottom plate, and a side beam. The support plate is located below and supports the multiple batteries. The bottom plate is located below the support plate and forms an exhaust channel with the support plate. When the multiple batteries experience thermal runaway, they discharge ejected material into the exhaust channel. The side beam is located on the side of the protective box facing away from the partition beam. The side beam has a first opening and a second opening that are connected. The first opening communicates with the exhaust channel. The second opening is located on the surface of the side beam facing the rear box wall. The orthographic projection of the second opening on the rear box wall at least partially overlaps with the window.

10. The battery pack according to claim 1, characterized in that, The window is located on the bottom wall of the protective box.

11. The battery pack according to claim 10, characterized in that, The housing includes a support plate and a bottom plate. The support plate is located below the plurality of batteries and supports the plurality of batteries. The bottom plate is located below the support plate and forms an exhaust channel between the bottom plate and the support plate. When the plurality of batteries experience thermal runaway, they discharge ejected material into the exhaust channel. The support plate has an opening, and the orthographic projection of the opening on the bottom wall of the housing at least partially overlaps with the window.

12. The battery pack according to claim 1, characterized in that, The protective box is provided with multiple windows, which are located on multiple different walls of the protective box.

13. The battery pack according to claim 12, characterized in that, The plurality of windows includes two windows, which are located on two opposite walls of the protective box, respectively.

14. The battery pack according to claim 13, characterized in that, The two windows are respectively located on the two opposite box walls of the protective box along the longitudinal direction of the partition beam.

15. The battery pack according to claim 14, characterized in that, The enclosure includes two side beams connected to both ends of the partition beam. The distances from the protective box to the two side beams along the longitudinal direction of the partition beam are D1 and D2, respectively, in mm. The values ​​are 0.5≤D1 / D2≤2, and / or 600mm≤D1≤1200mm, and / or 600mm≤D2≤1200mm.

16. The battery pack according to claim 1, characterized in that, The window is equipped with a grille.

17. The battery pack according to claim 1 or 16, characterized in that, The window is equipped with a filter screen.

18. The battery pack according to claim 1, characterized in that, The area of ​​the window is S1, in mm. 2 The area of ​​the box wall containing the window is S2, in mm. 2 , 0.05≤S1 / S2≤0.93, and / or, 25mm 2 ≤S1≤90000mm 2 , and / or 2500mm 2 ≤S2≤96100mm 2 .

19. The battery pack according to claim 1, characterized in that, The target gas includes at least one of carbon monoxide, carbon dioxide, hydrogen, and smoke.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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