A battery pack

Abstract

The application discloses a battery pack, comprising: an inner box body, a plurality of single batteries are arranged in the inner box body, and an exhaust port is arranged on the inner box body; an outer box body is arranged on the outer side of the inner box body, a discharge valve is arranged on the side wall of the outer box body, the exhaust port and the discharge valve form a discharge path from the single battery to the outer side of the battery pack, and a filtering assembly capable of filtering particles is arranged on the discharge path. In the battery pack, the discharge path for the single battery to flow out is arranged, and the filtering assembly is arranged on the discharge path. After the pressure of the single battery in the inner box body is out of control, the spraying material of the single battery can pass through the filtering assembly, the high-visibility particles are blocked by the filtering assembly, and the high-temperature gas passes through the filtering assembly and is discharged, so that the pressure relief of the single battery is realized, and the concentration of the visible material outside the battery pack is reduced, and the sensory effect is reduced.

Description

Technical Field

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

[0002] The battery pack contains multiple individual cells. When a single elevator cell experiences thermal runaway, the high-temperature gas and particulate matter inside it will be ejected from the explosion-proof valve and flow to the explosion-proof valve structure on the battery pack wall, where it will be quickly discharged from the battery pack. While the thermal runaway of a single cell is a controllable accident, the smoke generated during the discharge of the battery pack will produce a large amount of smoke, which will reduce visibility under operating conditions and cause panic among personnel, making it highly likely to cause secondary accidents.

[0003] Therefore, how to reduce the sensory impact caused by battery thermal runaway is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery pack to reduce the sensory impact caused by battery thermal runaway.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery pack, comprising:

[0007] The inner casing contains multiple individual batteries, and the inner casing has an exhaust port.

[0008] An outer casing is spaced apart from the outer casing. A discharge valve is provided on the side wall of the outer casing. The exhaust port and the discharge valve form a discharge path from the individual battery cell to the outside of the battery pack. A filter component capable of filtering particulate matter is provided on the discharge path.

[0009] As can be seen from the above technical solution, one aspect of this disclosure provides a battery pack having an inner casing and an outer casing. The inner casing houses multiple individual batteries, while the outer casing is spaced apart on the outside of the inner casing. The inner casing has an exhaust port. When the pressure of an individual battery inside the inner casing abnormally runs out of control, its explosion-proof valve opens, and the ejected material flows out through the exhaust port to prevent continuous impact on other individual batteries. The outer casing has a discharge valve. The ejected material from the individual batteries enters the gap between the inner and outer casings from the exhaust port and flows to the discharge valve. The discharge valve opens to release the ejected material from the individual batteries, preventing the internal pressure of the battery pack from rising and causing more serious consequences. Furthermore, a filter assembly is installed along the discharge path of the ejected material from the individual batteries. Large particles with high visibility in the ejected material are blocked by the filter assembly, while high-temperature gases pass through the filter assembly and are discharged. This achieves battery pack depressurization while preventing the observation of large amounts of visible smoke outside the battery pack, thus avoiding panic and reducing the sensory impact caused by battery thermal runaway. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention.

[0012] Figure 2 This is a side view of a battery pack provided according to an embodiment of the present invention;

[0013] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure in the diagram;

[0014] Figure 4 This is a schematic diagram of the structure of a filter assembly provided in an embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the assembly structure of the filter assembly and the inner housing.

[0016] Figure 6 This is a schematic diagram of the assembly structure of the first and second filter layers on one side of the support frame.

[0017] Figure 7 A schematic diagram showing the structure of the filter assembly positioned at the outlet valve location of the outer casing;

[0018] Figure 8This is a schematic diagram of the assembly structure of a filter component provided in an embodiment of the present invention.

[0019] in:

[0020] 10 - Inner casing; 110 - Individual battery; 120 - Exhaust port;

[0021] 20 - Outer casing; 210 - Discharge valve;

[0022] 30 - Filter assembly; 310 - First filter layer; 320 - Second filter layer; 330 - Support frame; 3310 - Mounting position; 340 - Receiving cavity. Detailed Implementation

[0023] The core of this application is to disclose a battery pack that reduces the sensory impact caused during battery thermal runaway.

[0024] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, one aspect of this disclosure provides a battery pack, which mainly includes an inner casing 10 and an outer casing 20. Multiple individual batteries 110 are stacked inside the inner casing 10 to store and output electrical energy. The outer casing 20 is spaced apart on the outside of the inner casing 10 to provide an additional layer of protection, preventing damage to the individual batteries 110 from direct impact. Simultaneously, to provide a stable discharge path for the ejected material when an abnormal pressure occurs in an individual battery 110 and the explosion-proof valve opens to release pressure, the inner casing 10 is provided with an exhaust port 120, and the outer casing 20 is provided with a discharge valve 210 on its side wall. The interlayer area between the exhaust port 120 and the discharge valve 210 forms a complete discharge path, allowing the ejected material from the individual batteries 110 inside the inner casing 10 to flow smoothly to the outside of the battery pack along the aforementioned discharge path when abnormal pressure occurs, thus preventing the risk of ignition or explosion due to excessive pressure inside the battery pack.

[0026] It should be noted that the exhaust port 120 and the discharge valve 210 are misaligned. This means that the ejected material entering the interlayer between the inner casing 10 and the outer casing 20 from the exhaust port 120 can be blocked by the inner wall of the outer casing 20 and then move to one or both sides. After being guided by the discharge path, it flows out from the discharge valve 210. This avoids the situation where the ejected material has an excessively strong impact and damages the discharge valve 210 when the exhaust port 120 and the discharge valve 210 are directly opposite each other, and avoids the ejected material having a long ejection distance outside the battery pack.

[0027] Furthermore, a filter assembly 30 is installed along the discharge path to filter the ejected material from the runaway individual battery 110. Specifically, one or more filter assemblies 30 are installed at any position along the discharge path. The ejected material will pass through at least one filter assembly 30 during its flow out of the battery pack. The filter assembly 30 filters and blocks large particles with high visibility in the ejected material, causing them to remain in the interlayer area between the inner casing 10 and the outer casing 20. Invisible high-temperature gases and small particles with low visibility will pass smoothly through the filter assembly 30 and be discharged. Sufficient discharge material can achieve smooth depressurization of the battery pack and prevent further damage to the battery pack. At the same time, because the large particles with high visibility are blocked by the filter assembly 30, the amount of smoke observable outside the battery pack will be significantly reduced, thus avoiding panic.

[0028] Furthermore, for the battery pack provided in the embodiments of this disclosure, the filter assembly 30 can be disposed at any position on the discharge path to filter and suppress smoke from the ejected material of the individual battery 110. In order to improve the filtration effect of the filter assembly 30, in some embodiments of this disclosure, the filter assembly 30 is fixedly disposed with the inner housing 10 and covers the exhaust port 120, so that the ejected material of the individual battery 110 can pass through the filter assembly 30 first and then enter the discharge path. The concentration of large particles in the discharge path is reduced, and the obstruction effect of high temperature gases in the discharge path is reduced, thereby improving the depressurization rate of the battery pack.

[0029] It should also be noted that in some embodiments of this disclosure, multiple inner boxes 10 can be provided in the outer box 20. The inner boxes 10 are arranged and connected to each other to collaboratively realize the storage and output of electrical energy. Correspondingly, in a single inner box 10, while the filter component 30 covers the exhaust port 120, most or all of its structure is located inside the inner box 10, without occupying the external area of ​​the inner box 10, without affecting the channel size between the inner box 10 and the outer box 20, and avoiding affecting the stacking arrangement of multiple inner boxes 10.

[0030] Furthermore, the purpose of the filter assembly 30 is to block large particulate impurities in the smoke. However, its pores during the filtration process are at risk of becoming clogged by these large particles, which could block the passage of high-temperature gas and reduce the depressurization rate of the battery pack. Therefore, in some embodiments of this disclosure, such as... Figure 4 and Figure 5 As shown, the filter assembly 30 has a layered structure to achieve graded filtration and reduce the clogging risk of a single-layer filter structure. Specifically, the filter assembly 30 includes at least a first filter layer 310 and a second filter layer 320. The first filter layer 310 is closer to the interior of the inner casing 10 than the second filter layer 320, so that the exhaust from the individual battery 110 first contacts the first filter layer 310, and some particles are blocked by the first filter layer 310. The smoke passing through the first filter layer 310 then passes through the second filter layer 320, achieving secondary filtration. Based on this, as... Figure 6 As shown, the pore size of the first filter layer 310 is larger than that of the second filter layer 320, so that the first filter layer 310 can intercept larger particles of impurities. Larger particles of impurities have higher visibility and are easier to handle, but they are also more likely to cause clogging of the filter assembly 30 and affect the pressure relief efficiency of the battery pack. In this embodiment, the preliminary filtration by the first filter layer 310 can effectively reduce the filtration burden of the second filter layer 320 and reduce the risk of clogging of the second filter layer 320.

[0031] Furthermore, after the ejected material from the single battery cell 110 passes through the first filter layer 310, larger particles of impurities are intercepted. The remaining ejected material mainly contains smaller particles of impurities and high-temperature gases. The remaining ejected material enters the second filter layer 320 for further filtration. Due to the smaller pore size of the second filter layer 320, it can perform finer filtration of the tiny particles in the ejected material without causing clogging due to excessively high concentrations of large particles. This layered filtration structure allows the filter assembly 30 to classify and process impurities in the ejected material, which not only improves filtration efficiency but also reduces the risk of clogging and extends the service life of the filter assembly 30. It should be further noted that the filter assembly 30 can also be configured with more filter layers according to filtration requirements. The pore size of the multi-stage filter layers decreases in the direction away from the single battery cell 110 to achieve a more refined filtration effect while maintaining the depressurization rate of the battery pack.

[0032] Based on the above embodiments, and considering the common smoke suppression and filtration requirements of the ejected material from a single battery cell 110, in some embodiments of this disclosure, the diameter of the filter holes on the first filter layer 310 is 3mm-6mm. Impurities with a particle diameter larger than the diameter of the filter holes on the first filter layer 310 in the ejected material from the single battery cell 110 can be directly intercepted by the first filter layer 310. It should be noted that, for the first filter layer 310, if its filter hole diameter is less than 3mm, although it can filter out more impurities, it will cause excessive resistance when the gas passes through, resulting in a slower gas discharge speed and affecting the timely release of internal pressure in the battery pack. If its filter hole diameter is greater than 6mm, some larger particles of impurities may pass directly through the filter holes and block subsequent processes, failing to achieve the expected filtration effect, thereby reducing the interception capability of the filter assembly 30 for larger particles of impurities in the gas.

[0033] The second filter layer 320 has filter holes with a diameter ranging from 2mm to 4mm. It should be noted that the filter holes in the second filter layer 320 are primarily used for fine filtration of small particles in the ejected material while maintaining the smooth passage of high-temperature gas. Therefore, if the filter hole diameter of the second filter layer 320 is less than 2mm, although it can filter out more particulate impurities and further reduce the visibility of smoke outside the battery pack, it will also increase the resistance to gas passage, affecting gas discharge efficiency. Conversely, if the filter hole diameter is greater than 4mm, the discharged gas will contain more particulate impurities, making it difficult to meet the smoke suppression filtration effect of the filter assembly 30. Therefore, in this embodiment, the filter hole diameter of the first filter layer 310 is set to 3mm-6mm, and the filter hole diameter of the second filter layer 320 is set to 2mm-4mm. This ensures effective filtration of particulate impurities in the ejected material while ensuring smooth gas discharge, meeting the pressure relief rate requirements of the battery pack. It should also be noted that the pore size of the first filter layer 310 is larger than that of the second filter layer 320. For example, the pore size of the first filter layer 310 is 3mm, while the pore size of the second filter layer 320 is 2mm; or the pore size of the first filter layer 310 is 5mm, while the pore size of the second filter layer 320 is 3mm; or the pore size of the first filter layer 310 is set to 6mm, while the pore size of the second filter layer 320 is 4mm.

[0034] Furthermore, in order to improve the overall performance and structural stability of the filter assembly 30, in some embodiments of this disclosure, the first filter layer 310 and the second filter layer 320 are arranged in parallel, so that the ejected material from the single battery 110 can flow along a relatively stable path when passing through the first filter layer 310 and the second filter layer 320, avoiding the ejected material from becoming disordered or deviating during the filtration process, and improving the uniformity and consistency of the filtration effect. Meanwhile, the interval between the first filter layer 310 and the second filter layer 320 is 0.5mm-20mm, specifically 0.5mm, 5mm, 10mm, 15mm, and 20mm. It should be noted that if the interval between the first filter layer 310 and the second filter layer 320 is less than 0.5mm, the space between the two filter layers will be too small, and the high-temperature gas will encounter excessive resistance when passing through. That is, after the high-temperature gas passes through the first filter layer 310 and is impacted, it is difficult to adjust its posture and may tilt and impact the filter holes of the second filter layer 320, affecting the gas discharge and depressurization efficiency. In addition, the too small interval may also cause mutual interference between the two filter layers, reducing the filtration effect. On the other hand, if the interval between the two filter layers is greater than 20mm, although it can reduce the resistance when the gas passes through, the excessively large interval will reduce the overall structural compactness of the filter assembly 30. It not only occupies a lot of space, but also causes the first filter layer 310 and the second filter layer 320 to be relatively displaced when the filter assembly 30 is subjected to external forces such as vibration and impact, thus affecting the stability of the filtration effect.

[0035] Furthermore, in order to meet the throughput requirements and filtration effect of the first filter layer 310 and the second filter layer 320, the area ratio of the open area on the first filter layer 310 is 30%-95%, and the area ratio of the open area on the second filter layer 320 is also 30%-95%. An open area ratio of not less than 30% ensures that the first filter layer 310 and the second filter layer 320 have sufficient filtration effect, while an open area ratio of not more than 95% ensures the structural strength of the first filter layer 310 and the second filter layer 320 and improves their service life.

[0036] Based on the above embodiments, the filter assembly 30 further includes a third filter layer and a fourth filter layer to further improve its filtration accuracy. Specifically, the third filter layer is disposed on the side of the second filter layer 320 facing away from the first filter layer 310, and is spaced apart from the second filter layer 320. Preferably, the interval between the third filter layer and the second filter layer 320 is equal to the interval between the first filter layer 310 and the second filter layer 320, thereby improving the uniformity of multi-stage filtration in the filter assembly 30. Correspondingly, the fourth filter layer is disposed on the side of the third filter layer facing away from the second filter layer 320, and is spaced apart from the third filter layer. Furthermore, the pore size of the third filter layer is smaller than that of the second filter layer 320, and the pore size of the fourth filter layer is smaller than that of the third filter layer. The ejected material passes through the first filter layer 310, the second filter layer 320, the third filter layer, and the fourth filter layer sequentially along the passage path of the filter assembly 30, thereby achieving more refined multi-stage filtration.

[0037] It should also be noted that the diameter of the filter pores in the third filter layer is 0.5mm-2mm, specifically 0.5mm, 5mm, 10mm, 15mm or 20mm, and the proportion of its open area is 30%-95%, specifically 30%, 50%, 70% or 90%, in order to cooperate with the first filter layer 310 and the second filter layer 320 to achieve multi-stage filtration.

[0038] Furthermore, the fourth filter layer can adopt a plate structure with filter holes. In this case, the diameter of the filter holes on the fourth filter layer is 0.1mm-0.5mm, specifically 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm. At the same time, the fourth filter layer can also be one or a combination of ceramic fiber felt, glass fiber felt and fiber aerogel felt with filtration performance. In this case, the porosity of the fourth filter layer is 50%-99% to meet the requirements of the final fine filtration in multi-stage filtration.

[0039] To improve the maintainability and assembly flexibility of the filter assembly 30 when installed on the inner housing 10, in some embodiments of this disclosure, such as Figure 4 and Figure 6As shown, the filter assembly 30 also includes a support frame 330, which is detachably mounted to the exhaust port 120 of the inner housing 10 via bolts or snap-fit ​​structures. The first filter layer 310 and the second filter layer 320 are detachably mounted on the support frame 330. It should be noted that the first filter layer 310 and the second filter layer 320 can adopt a sliding groove structure, or be independently mounted on the support frame 330 via a structure with a support platform and fixed with screws. On the one hand, the support frame 330, as the basic load-bearing structure, can be removed entirely from the inner housing 10. This allows for the overall inspection and maintenance of the filter assembly 30. The independent assembly structure of the first filter layer 310 and the second filter layer 320, which are mounted on the support frame 330, enables maintenance personnel to conveniently replace, clean, or inspect one or both of the first filter layer 310 and the second filter layer 320 according to actual needs. Furthermore, if a single filter layer is clogged or abnormally damaged, it can be cleaned or replaced individually without disassembling the entire filter assembly 30, thereby improving maintenance efficiency and reducing operating costs.

[0040] In addition, the support frame 330 can be independently installed at the exhaust port 120 position. The first filter layer 310 and the second filter layer 320 do not need to consider the relative position and connection structure with the exhaust port 120 on the inner box 10. Instead, they can achieve a tight and stable connection with the inner box 10 through the support frame 330. At the same time, the first filter layer 310 and the second filter layer 320 can also be pre-installed offline, which reduces the overall assembly difficulty of the battery pack.

[0041] In order to improve the versatility of the filter assembly 30 and make it adaptable to the assembly requirements of the inner casing 10 in different battery pack projects, in some embodiments of this disclosure, the support frame 330 is provided with a mounting position 3310, and the first filter layer 310 and the second filter layer 320 used for filtering the ejected material are both installed on the mounting position 3310. The mounting position 3310 adopts uniform installation to make the installation of the filter layer more standardized and stable, and to ensure that the mounting position 3310 of the filter layer on the support frame 330 is accurate. Meanwhile, multiple mounting positions 3310 are provided and spaced apart. Specifically, on a single support frame 330, the number of mounting positions 3310 is greater than the number of filter layers that need to be installed, so as to provide a structural expansion basis for the filter assembly 30. That is, when it is necessary to further improve the filtration effect, additional filter layers can be added to the existing mounting positions 3310 without redesigning or replacing the support frame 330, thereby improving the applicability and versatility of the filter assembly 30. At the same time, the first filter layer 310 and the second filter layer 320 can be assembled on different mounting positions 3310 on a single support frame 330 to adjust the spacing between the first filter layer 310 and the second filter layer 320, thus adapting to the filtration needs of different filtration conditions.

[0042] Furthermore, in order to improve the assembly accuracy and stability of the overall structure of the filter assembly 30, based on the above embodiments, such as... Figure 5 and Figure 6 As shown, the mounting positions 3310 on the support frame 330 are evenly arranged at the same intervals. When the first filter layer 310 and the second filter layer 320 are assembled on the mounting positions 3310, they have a standardized interval setting. That is, when the first filter layer 310 and the second filter layer 320 are set on two adjacent mounting positions 3310, they have a minimum interval, which is defined here as the preset interval. When the mounting positions 3310 are adjusted on different mounting positions 3310, the first filter layer 310 and the second filter layer 320 can be adjusted in a uniform gradient at integer multiples of the preset interval to reach the desired interval. This makes the interval setting of the first filter layer 310 and the second filter layer 320 have a clearer standard and can be selectively adjusted for different working conditions. Furthermore, it should be noted that the interval between adjacent mounting positions 3310 is 0.5mm-10mm, specifically 0.5mm, 4mm, 8mm, or 10mm. It should be noted that the interval between adjacent mounting positions 3310 needs to meet the minimum interval requirements of the filter layers during smoke suppression in the battery pack project, and can also meet larger interval requirements with multiple mounting positions 3310 at intervals. That is, setting two filter layers at an interval of 0.5mm-10mm can be applied to some projects without affecting the smooth flow of the sprayed material due to excessively small spacing between the two filter layers. At the same time, the interval between adjacent mounting positions 3310 should not be too large, to avoid an excessively long flow path of the sprayed material between the filter layers, which would increase the resistance when the gas passes through.

[0043] Furthermore, it should be noted that the evenly distributed mounting positions 3310 also help to improve the overall structural stability of the filter assembly 30. When the filter assembly 30 is subjected to external forces such as vibration and impact, each mounting position 3310 is subjected to the same stress state, and the stress distribution is more uniform, avoiding damage to the filter layer or deformation of the support frame 330 due to local stress concentration.

[0044] Furthermore, in some embodiments of this disclosure, such as Figure 6 As shown, one side of the mounting position 3310 has a groove structure. When a single filter layer is assembled on the mounting position 3310, it slides into the mounting position 3310 through the groove structure. After reaching the bottom of the groove structure on the mounting position 3310, the filter layer is stably assembled by using end clips or bolts to seal it. When performing maintenance and replacement, a single filter layer can also be inspected and replaced individually, reducing the difficulty of maintenance.

[0045] Furthermore, it should be noted that, in order to avoid the influence of the filter component 30 on the battery pack depressurization rate, in some embodiments of this disclosure, such as... Figure 2 As shown, the inner casing 10 has an exhaust port 120 on each of its opposite sides, and each exhaust port 120 is equipped with a filter component 30. When the individual battery 110 in the inner casing 10 experiences abnormal pressure and ejects, the ejected material can be dispersed to the two exhaust ports 120 and enter the space between the inner casing 10 and the outer casing 20 from the exhaust ports 120. The exhaust ports 120 on opposite sides of the inner casing 10 can meet the ejected material release needs of the adjacent area, avoiding the accumulation of ejected material in some areas of the inner casing 10 and causing abnormal pressure. At the same time, it reduces the exhaust burden when only a single exhaust port 120 is provided, significantly improves the emission efficiency of the ejected material, and increases the depressurization rate of the battery pack.

[0046] Furthermore, in some other embodiments of this disclosure, such as Figure 7 As shown, the filter assembly 30 is fixedly installed at one or two locations on the inner and outer walls of the outer casing 20. The filter assembly 30 has a square or arc-shaped structure and covers the discharge valve 210. In this embodiment, the ejected material can be quickly released from the inner casing 10. That is, the filter assembly 30 is installed at the exhaust port 120 position. The ejected material after the single cell 110 goes out of control can be directly discharged from the exhaust port 120 without being blocked, thereby achieving rapid depressurization of the inner casing 10 and preventing the ejected material from continuously affecting other single cells 110 in the inner casing 10, thus ensuring the operational stability of the inner casing 10. At the same time, after the ejected material reaches the discharge valve 210 position on the outer casing 20, it is directly filtered and discharged through the filter assembly 30.

[0047] Furthermore, it should be noted that the filter assembly 30, which is disposed on the inner and outer walls of the outer casing 20, has a side-mounted structure, and its two sides in the vertical direction serve as channels for the ejected material. To reduce the risk of clogging when filtering particles in the ejected material, in some embodiments of this disclosure, the bottom of the filter assembly 30 in the vertical direction is an open structure, or as shown... Figure 8 As shown, the bottom has a receiving cavity 340. After the single-layer filter structure blocks particulate matter, some of the particulate matter can fall off under gravity or be temporarily stored in the receiving cavity 340, thereby reducing the risk of clogging the filter assembly 30 and extending its service life. Additionally, when the filter assembly 30 is placed on the side, through holes can be made in the bottom plate of the outer casing 20 that abuts against the receiving cavity 340 to discharge particulate matter that falls between the filter assembly 30 into the outer casing 20, where it falls into the gap between the outer casing 20 and the bottom protective plate of the battery pack, further reducing the risk of clogging the filter assembly 30.

[0048] It should be noted that the discharge valve 210 is the end position of the discharge path of the material ejected from the single battery 110. Setting the filter assembly 30 at this position can ensure that the structural layout of other positions in the battery pack is not affected by the filter assembly 30, and has a more regular structural layout space. At the same time, since the discharge valve 210 is at the end position, when inspecting the filter assembly 30, the maintenance personnel can directly or through simple disassembly to achieve intuitive inspection of the filter assembly 30 without disassembling other structures in the battery pack, thus reducing the difficulty of maintenance.

[0049] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, include: The inner casing (10) is provided with multiple individual batteries (110) inside the inner casing (10), and an exhaust port (120) is provided on the inner casing (10). An outer casing (20) is spaced apart from the outer casing (10). A discharge valve (210) is provided on the side wall of the outer casing (20). The exhaust port (120) and the discharge valve (210) form a discharge path from the single cell (110) to the outside of the battery pack. A filter assembly (30) capable of filtering particulate matter is provided on the discharge path.

2. The battery pack as described in claim 1, characterized in that, The filter assembly (30) covers the exhaust port (120) and is disposed on the inner wall of the inner housing (10).

3. The battery pack as described in claim 2, characterized in that, The filter assembly (30) includes at least a first filter layer (310) and a second filter layer (320), wherein the first filter layer (310) is closer to the interior of the inner housing (10) than the second filter layer (320), and the filter pore size of the first filter layer (310) is larger than the filter pore size of the second filter layer (320).

4. The battery pack as described in claim 3, characterized in that, The diameter of the filter holes on the first filter layer (310) is 3mm-6mm, and the diameter of the filter holes on the second filter layer (320) is 2mm-4mm.

5. The battery pack as described in claim 3, characterized in that, The first filter layer (310) and the second filter layer (320) are arranged in parallel, and the interval between them is 0.5mm-20mm.

6. The battery pack as described in claim 3, characterized in that, The area of ​​the perforated region on the first filter layer (310) accounts for 30%-95%, and the area of ​​the perforated region on the second filter layer (320) accounts for 30%-95%.

7. The battery pack as described in claim 3, characterized in that, The filter assembly (30) further includes a third filter layer and a fourth filter layer. The third filter layer is disposed on the side of the second filter layer (320) facing away from the first filter layer (310) and is spaced apart from the second filter layer (320). The fourth filter layer is disposed on the side of the third filter layer opposite to the second filter layer (320) and is spaced apart from the third filter layer. The pore size of the third filter layer is smaller than that of the second filter layer (320), and the pore size of the fourth filter layer is smaller than that of the third filter layer.

8. The battery pack as described in claim 7, characterized in that, The diameter of the filter holes on the third filter layer is 0.5mm-2mm, and the area of ​​the holes accounts for 30%-95%.

9. The battery pack as described in claim 8, characterized in that, The fourth filter layer is a plate structure, and the diameter of the filter holes on the fourth filter layer is 0.1mm-0.5mm, or... The fourth filter layer is one or a combination of ceramic fiber felt, glass fiber felt and fiber aerogel felt, and the porosity of the fourth filter layer is 50%-99%.

10. The battery pack as described in claim 3, characterized in that, The filter assembly (30) includes a support frame (330), on which the first filter layer (310) and the second filter layer (320) are detachably mounted, and the support frame (330) is fitted to the exhaust port (120).

11. The battery pack as claimed in claim 10, characterized in that, The support frame (330) is provided with mounting positions (3310), and the first filter layer (310) and the second filter layer (320) are both installed on the mounting positions (3310). The mounting positions (3310) are spaced apart, and the number of mounting positions (3310) is greater than the number of filter layers.

12. The battery pack as claimed in claim 11, characterized in that, The mounting positions (3310) are evenly arranged at the same intervals, and the interval between adjacent mounting positions (3310) is 0.5mm-10mm.

13. The battery pack as described in claim 2, characterized in that, An exhaust port (120) is provided on each of the opposite sides of the inner box (10), and a filter assembly (30) is provided for each exhaust port (120).

14. The battery pack as claimed in claim 2, characterized in that, The filter assembly (30) has a bottom opening in the vertical direction, which forms a cavity (340) for accommodating particulate matter.

15. The battery pack as claimed in claim 1, characterized in that, The filter assembly (30) is fixedly disposed on the inner wall or outer wall of the outer casing (20), and the filter assembly (30) covers the discharge valve (210).

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