A battery pack

Abstract

The application relates to the battery technical field and discloses a battery pack, which comprises a box body, at least two battery compartments separated by a partition beam inside, a bottom plate arranged in a single battery compartment, at least one battery group arranged on the bottom plate, a single battery group comprising a plurality of single batteries arranged along a first direction, and the first direction being perpendicular to the extension direction of the partition beam; a containment assembly arranged at the bottom of each battery group and comprising a pair of first blocking strips and a pair of second blocking strips; the containment assembly encloses all explosion-proof valves around the bottom of the single battery group; the containment assembly further comprises a blocking strip arranged between the two first blocking strips and spaced apart from any one side second blocking strip, and at least one blocking strip is arranged between every two adjacent explosion-proof valves. The application arranges the containment assembly with a closed structure at the bottom of the battery group to protect the explosion-proof valves in the circumferential direction and internally, so that the glue is blocked, and the risk of high-temperature gas spreading after thermal runaway of other battery groups is avoided.

Description

Technical Field

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

[0002] Currently, multiple sub-battery compartments are set inside the battery pack's casing structure, and each sub-battery compartment contains multiple individual batteries glued together. When thermal runaway occurs in some battery compartments, high-temperature gas can easily spread and invade other battery compartments, threatening the stable operation of other sub-battery compartments, causing the thermal runaway to spread and reducing the overall safety of the battery pack. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack that reduces the impact of thermal runaway between adjacent sub-battery compartments and improves the safety of the battery pack.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A battery pack, comprising:

[0006] The enclosure is divided into at least two battery compartments by a partition beam. Each battery compartment has a bottom plate and at least one battery pack is provided on the bottom plate. Each battery pack includes multiple individual cells arranged along a first direction, and the first direction is perpendicular to the extension direction of the partition beam.

[0007] An enclosure assembly is installed at the bottom of each battery pack. An explosion-proof valve is installed at the bottom of each individual battery. The enclosure assembly includes a pair of first baffles arranged in parallel and spaced apart, and a pair of second baffles arranged in parallel and spaced apart. The second baffles extend along a first direction. The enclosure assembly closes off all explosion-proof valves surrounding the bottom of a single battery pack.

[0008] The enclosure component also includes a barrier strip, which is disposed between two first baffles and spaced apart from a second baffle on either side. At least one barrier strip is disposed between every two adjacent explosion-proof valves. As can be seen from the above technical solution, one aspect of this disclosure provides a battery pack, the housing of which is separated from at least two independent battery compartments by a partition beam. A bottom plate is disposed within each battery compartment, and at least one battery pack is disposed on the bottom plate. The battery pack is the smallest independent assembly unit composed of individual cells; that is, a single battery pack includes multiple individual cells arranged along a first direction, which is perpendicular to the extension direction of the partition beam. Based on this, the enclosure component achieves a sealant and thermal runaway sealing effect for each battery pack. Specifically, the enclosure component is a closed structure, which is closed by a pair of parallel and spaced-apart first baffles and a pair of parallel and spaced-apart second baffles, and its closed area surrounds the individual battery pack. The explosion-proof valves at the bottom of all individual cells prevent adhesive from entering the explosion-proof valve area during the glue injection process, thus ensuring smooth venting in the event of thermal runaway of an individual cell. Furthermore, in the event of thermal runaway within a single battery pack, the enclosed structure of the enclosure reduces the risk of high-temperature gases escaping to other battery pack areas, preventing cross-contamination between adjacent battery packs during individual cell thermal runaway and enhancing the independence and operational safety of each battery pack. Additionally, the enclosure includes barrier strips positioned at the bottom of each individual battery pack between every two adjacent explosion-proof valves to reduce the impact of a thermally runaway individual cell on other individual cells, further improving the operational stability of the battery pack. Attached Figure Description

[0009] 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.

[0010] Figure 1 This is a schematic diagram of the internal structure of the box provided in an embodiment of the present utility model;

[0011] Figure 2 This is a schematic diagram of the enclosure component structure provided on the base plate according to an embodiment of the present utility model;

[0012] Figure 3 This is a schematic diagram of the structure of a single enclosure component provided in an embodiment of the present invention;

[0013] Figure 4 A side view of the mating structure of a single battery pack and enclosure component provided in an embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of the cooperation structure between the enclosure component and some individual cells in the battery pack according to an embodiment of the present invention.

[0015] Figure 6 This is a schematic diagram showing the position of one side of a single enclosure component and an explosion-proof valve according to an embodiment of the present invention;

[0016] Figure 7 A schematic diagram of the first and second stop bars embedded and mating structure provided in an embodiment of this utility model;

[0017] Figure 8 A schematic diagram of the first and second stop bars embedded and mating structure provided in another embodiment of this utility model;

[0018] Figure 9 A schematic diagram of the inclined fit structure of the first and second stop bars provided in an embodiment of this utility model;

[0019] Figure 10 A schematic diagram of the stepped fit structure of the first and second stop bars provided in an embodiment of this utility model;

[0020] Figure 11 This is a schematic diagram of the toothed corrugated structure of the first and second baffle bars provided in an embodiment of the present invention;

[0021] Figure 12 A schematic diagram of a partially integrated enclosure component provided in one embodiment of this utility model;

[0022] Figure 13 A schematic diagram of an integrated enclosure component provided in an embodiment of this utility model.

[0023] in:

[0024] 10-Box body; 110-Separation beam; 120-Battery compartment; 130-Base plate; 140-Battery pack; 20-Single cell; 210-Explosion-proof valve; 30-Enclosure component; 310-First baffle; 3110-Protrusion; 320-Second baffle; 3210-Connecting groove; 330-Barrier strip; 340-First heat-conducting strip; 350-Second heat-conducting strip. Detailed Implementation

[0025] The core of this application is to disclose a battery pack that reduces the impact of thermal runaway between adjacent sub-cells and improves the safety of the battery pack.

[0026] 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.

[0027] like Figure 1 As shown, this disclosure provides a battery pack, which includes a housing. It should be noted that the housing of the battery pack refers to a closed or semi-closed structure made of materials such as metal and plastic. It provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and fixes these components in the battery pack housing through reasonable structural design to ensure that they maintain a relatively stable position during the operation of the battery pack and avoid damage to components or loosening of connections due to vibration, impact and other factors.

[0028] The battery pack housing typically includes an upper cover and a lower housing. The lower housing includes a base plate 130 and a side plate connected to and surrounding the base plate 130. The upper cover is connected to the side plate and includes a cover plate opposite to the base plate 130. The upper cover and the lower housing together enclose a receiving chamber.

[0029] The upper cover is a sealing component used to cover the cavity of the battery pack housing, encapsulating the battery pack inside the cavity and isolating it from the outside world to prevent external moisture and dust from affecting the battery module.

[0030] The top cover can be made of non-metallic materials, such as any polymer compound used as a raw material for plastic products, i.e., resin. Commonly used resins include polyphenylene sulfide resin (PPS), polyphenylene sulfide resin (PPO), and polypropylene resin (PP). Alternatively, it can be made of composite materials including reinforcing agents and resins; commonly used reinforcing agents include glass fiber, carbon fiber, and graphite fiber. Metallic materials can also be used, such as iron, aluminum, aluminum alloys, iron alloys, and stainless steel. Furthermore, the top cover can be in various shapes, such as rectangular or circular, depending on the specific requirements.

[0031] The battery pack casing can be cast from materials such as steel plates and aluminum alloys, or made from lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0032] The battery pack casing can be cylindrical, cuboid, cube, etc.

[0033] And such Figure 1 and Figure 2As shown, in the battery pack provided in this embodiment, the housing 10 is separated into at least two battery compartments 120 by a partition beam 110. Each battery compartment 120 has a base plate 130 inside, and at least one battery pack 140 is provided on the base plate 130. It should be noted that the battery pack 140 is the smallest independent operating unit formed by combining individual batteries 20. Each battery pack 140 includes multiple individual batteries 20 arranged along a first direction, and the first direction is perpendicular to the extension direction of the partition beam 110, so that the multiple battery packs 140 can be evenly arranged on both sides of the partition beam 110, and the uniformity of the structural distribution of the battery compartments 120 in the housing 10.

[0034] And such Figure 2 and Figure 3 As shown, a single battery pack 140 contains multiple individual cells 20, and the bottom of each individual cell 20 is fixed to the bottom plate 130 of the battery compartment 120 by adhesive. It should also be noted that for individual cells 20 with explosion-proof valves 210 at the bottom, in order to prevent the adhesive from clogging the explosion-proof valves 210 during the adhesive bonding process and affecting the release of high-temperature gas in the event of thermal runaway, the battery pack provided in this embodiment also includes a containment component 30. Specifically, the containment component 30 is disposed at the bottom of each battery pack 140 and, through a surrounding closed structure, contains the explosion-proof valves 210 at the bottom of all individual cells 20 in the single battery pack 140.

[0035] It should be noted that the enclosure component 30 is pressed between the bottom of the individual battery 20 and the bottom plate 130 of the housing 10, which can block the intrusion path of the adhesive to the explosion-proof valve 210 during the adhesive injection process. Furthermore, since the enclosure component 30 is arranged around the explosion-proof valve 210 to meet the adhesive blocking requirement of the explosion-proof valve 210 and prevent the adhesive from entering the area of ​​the explosion-proof valve 210 during the adhesive injection process, the enclosure component 30 is a closed structure. As a result, when the individual battery 20 in a single battery pack 140 experiences thermal runaway, the high-temperature gas ejected from the explosion-proof valve 210 is blocked by the closed enclosure component 30 and gathers downward to the exhaust structure of the battery pack, reducing the risk of high-temperature gas escaping to other battery packs 140 and causing thermal runaway problems in other battery packs 140.

[0036] Specifically, such as Figure 2 , Figure 5 and Figure 6As shown, the enclosure component 30 includes a pair of parallel and spaced-apart first baffles 310 and a pair of parallel and spaced-apart second baffles 320, which combine to form a closed frame structure and achieve a surrounding arrangement of all explosion-proof valves 210 in the battery pack 140. The paired and parallel first baffles 310 and second baffles 320 allow the enclosure component 30 to be assembled separately, reducing the difficulty of aligning the positions of each baffle. At the same time, it allows the enclosure component 30 to have a more regular shape structure, such as a rectangular, square, parallelogram, or rhomboid structure. Its regular arrangement configuration has a stable enclosure effect.

[0037] It should also be noted that in some embodiments of this disclosure, the second baffle 320 extends along the first direction to span the installation area of ​​all explosion-proof valves 210, while the first baffle 310 closes the two second baffles 320 on both sides of all explosion-proof valves 210 to satisfy the closed structure of the enclosure assembly 30.

[0038] Furthermore, the two first baffles 310 in the enclosure component 30 can adopt the same structure or have different width or length dimensions. It is only necessary to ensure that their length covers the projected length of the explosion-proof valve 210 on the first baffle 310, and that their width meets the requirements for sealant and high-temperature gas isolation.

[0039] In some specific embodiments, the two first baffles 310 have the same structure. For commonly used rectangular or oblong explosion-proof valves 210, the two first baffles 310 extend along the length of the explosion-proof valve 210. In order to improve the uniformity of the effect of the two first baffles 310, the distance between the two first baffles 310 and the nearest explosion-proof valve 210 is equal, so that the enclosure component 30 of the closed structure has a more uniform protective effect on the explosion-proof valves 210 on both sides.

[0040] Furthermore, the enclosure component 30 provided in the above embodiments can provide independent protection for each battery pack 140. On this basis, the enclosure component 30 also includes a barrier strip 330 disposed inside it. Specifically, the barrier strip 330 is disposed between two first baffles 310 and is spaced apart from the second baffles 320 at both ends. At the same time, at least one barrier strip 330 is disposed between each pair of adjacent explosion-proof valves 210.

[0041] It should be noted that the barrier strip 330 is used to separate adjacent explosion-proof valves 210 to prevent some of the high-temperature and high-pressure gas ejected from the explosion-proof valve 210 of a single cell 20 from accumulating between the explosion-proof valve 210 and the base plate 130 due to failure to be discharged in time through the corresponding pressure relief hole on the base plate 130, which would further aggravate thermal runaway. At the same time, in this embodiment, the barrier strip 330 and the second baffle strip 320 are set at intervals to accelerate the exhaust to a certain extent and avoid the accumulation of high-temperature and high-pressure gas between the explosion-proof valve 210 and the base plate 130, which would cause a greater risk of thermal runaway.

[0042] Furthermore, in the battery pack provided in this embodiment, the width of the first baffle 310 is greater than the width of the barrier strip 330, so that the first baffle 310 located at the end of the enclosure component 30 has a stronger adhesive blocking and gas release effect compared to the barrier strip 330 located inside the enclosure component 30. This allows a single enclosure component 30 to strengthen its peripheral protection, maintain the independence of the explosion-proof valve 210 inside a single battery pack 140, and further reduce the risk of gas spread during thermal runaway of adjacent battery packs 140.

[0043] Furthermore, in some embodiments of this disclosure, such as Figure 6 As shown, the width L1mm of the first baffle 310 ranges from 5mm to 15mm, specifically 5mm, 8mm, 11mm, or 15mm. It should be noted that if the width of the first baffle 310 is less than 5mm, it cannot meet the end protection effect of the enclosure component 30, and it is difficult to achieve effective protection against adhesive and thermal runaway high-temperature gases. If the width of the first baffle 310 is greater than 15mm, it will occupy a large space at the bottom of the battery pack 140, resulting in insufficient bonding area for some individual cells 20, which leads to poor bonding strength and affects its structural stability.

[0044] Furthermore, in the battery pack provided in the embodiments of this disclosure, the barrier strip 330 can be a straight line structure or a broken line structure, or it can be set at an angle, as long as it can isolate the two explosion-proof valves 210. In some embodiments of this disclosure, the barrier strip 330 is set perpendicular to the second baffle 320, so that the enclosure component 30 for each explosion-proof valve 210 in the battery pack 140 is more regular. It should also be noted that the distance L2mm between the end of the barrier strip 330 and the adjacent second baffle strip 320 ranges from 1mm to 5mm, specifically 1mm, 2mm, 3mm, 4mm, or 5mm. It should be noted that if L2mm is less than 1mm, the connection path between the two explosion-proof valves 210 is small, and high-temperature and high-pressure gas is likely to accumulate between the explosion-proof valve 210 and the base plate 130, leading to further thermal runaway problems. If L2mm is greater than 5mm, the amount of high-temperature and high-pressure gas entering other explosion-proof valves 210 through the barrier strip 330 during thermal runaway is large, which has too great an impact on adjacent single cells 20 and is not conducive to the overall stability of the battery pack.

[0045] Furthermore, it should be noted that in the battery pack provided in this embodiment, a heat exchange plate is provided at the bottom of the bottom plate 130 to accelerate the heat exchange of the individual battery cells 20. At the same time, the two second baffles 320 are connected by a first heat-conducting strip 340. Preferably, the ends of the two second baffles 320 are respectively connected by the first heat-conducting strip 340, and the two ends of the first heat-conducting strip 340 abut against the second baffles 320. This allows the battery surface at the location of the explosion-proof valve 210 to improve temperature uniformity through the heat transfer between the two second baffles 320 via the first heat-conducting strip 340, thereby improving the heat exchange efficiency between the battery surface around the explosion-proof valve 210 and the bottom heat exchange plate.

[0046] It should also be noted that the first heat-conducting strip 340 can also cooperate with the first baffle 310 to improve the sealing effect at the end of the second baffle 320 and optimize the sealing effect of the enclosure component 30. Either the first heat-conducting strip 340 or the first baffle 310 can be set inside the enclosure component 30.

[0047] Furthermore, in order to optimize the above technical solution, in some embodiments of this disclosure, the enclosure component 30 is also provided with a second heat-conducting strip 350. Specifically, at least one second heat-conducting strip 350 is provided between every two adjacent explosion-proof valves 210 to achieve heat conduction and concentration between adjacent explosion-proof valves 210, thereby reducing the degree of heat concentration at the explosion-proof valve 210 position and providing overheat protection for the battery surface in the explosion-proof valve 210 area. At the same time, the second heat-conducting strip 350 can cooperate with the barrier strip 330 to achieve effective isolation of adjacent explosion-proof valves 210. Therefore, in this embodiment, similar to the barrier strip 330, the distance L3mm between the end of the second heat-conducting strip 350 and the second baffle 320 on its nearest side is in the range of 1mm-5mm, specifically 1mm, 2mm, 3mm, 4mm or 5mm; similar to the distance L2mm between the end of the barrier strip 330 and the second baffle 320 on its nearest side, if L3mm is less than 1mm, the connection path between the two explosion-proof valves 210 is small, and high-temperature and high-pressure gas is likely to accumulate between the explosion-proof valve 210 and the base plate 130, leading to further thermal runaway problems; while if L3mm is greater than 5mm, the amount of high-temperature and high-pressure gas entering other explosion-proof valve 210 positions through the barrier strip 330 during thermal runaway is large, which has too great an impact on adjacent single cells 20 and is not conducive to the overall stability of the battery pack.

[0048] Based on the above embodiments, the distance L4mm between the first baffle 310 on one side and its nearest explosion-proof valve 210 ranges from 1mm to 20mm, specifically 1mm, 5mm, 10mm, 15mm, or 20mm. It should be noted that the distance between the first baffle 310 and the explosion-proof valve 210 on one side of the single battery pack 140 directly affects the performance of the first baffle 310 in protecting the explosion-proof valve 210 on one side of the single battery pack 140 from rubber and thermal runaway. For example, if the distance L4mm between the first baffle 310 and the explosion-proof valve 210 is less than... If the distance L4mm between the first baffle 310 and the explosion-proof valve 210 is too close, the adhesive blocked by the first baffle 310 will be too close to the explosion-proof valve 210, posing a significant risk that the adhesive will hinder the smooth ejection of high-temperature, high-pressure gas from the explosion-proof valve 210 area. If the distance L4mm between the first baffle 310 and the explosion-proof valve 210 is greater than 20mm, the distance between the first baffle 310 and the explosion-proof valve 210 will be too far. In the event of thermal runaway of the single cell 20, the high-temperature, high-pressure gas ejected from the explosion-proof valve 210 will accumulate in the area between the first baffle 310 and the explosion-proof valve 210 and cannot be ejected smoothly. Therefore, in this embodiment, the range of the distance L4mm between the first baffle 310 and the explosion-proof valve 210 is limited to 1mm-20mm to balance the adhesive-blocking effect of the first baffle 310 and the protection against the high-temperature gas ejected from the explosion-proof valve 210.

[0049] Furthermore, in some other embodiments of this disclosure, the two second baffles 320 in the enclosure assembly 30 may have the same structure or different width or length dimensions, as long as their length covers the projected length of the explosion-proof valve 210 on the second baffle 320, and their width meets the requirements for sealing and high-temperature gas isolation.

[0050] In some specific embodiments, the two second baffles 320 have the same structure and are disposed on both sides of the explosion-proof valve 210 along its length direction, so as to extend along the width direction of the explosion-proof valve 210.

[0051] Furthermore, the two second baffles 320 are symmetrically arranged on both sides of the explosion-proof valve 210 along its length to improve the uniformity of the action of the second baffles 320. In some embodiments of this disclosure, the distance L5mm between the second baffle 320 on one side and the explosion-proof valve 210 ranges from 1mm to 15mm; specifically, it can be 1mm, 5mm, 9mm, 13mm or 15mm. It should be noted that the distance between the second baffle 320 and the explosion-proof valve 210 directly affects the adhesive-blocking effect of the second baffle 320 on the explosion-proof valve 210 and its thermal runaway protection effect. If the distance L5mm between the second baffle 320 and the explosion-proof valve 210 is less than 1mm, the second baffle 320 is too close to the explosion-proof valve 210. The distance between the adhesive blocked by the second baffle 320 and the explosion-proof valve 210 is too small. A small amount of adhesive leaking through the second baffle 320 will affect the installation area of ​​the explosion-proof valve 210, resulting in a significant risk of adhesive leakage. If the distance L5mm between the second baffle 320 and the explosion-proof valve 210 is greater than 15mm, the second baffle 320 will be too close to other battery packs 140. In the event of thermal runaway of a single battery 20, the high-temperature gas generated at the location of the second baffle 320 can easily affect the adjacent battery pack 140. Therefore, in this embodiment, the distance L5mm between the second baffle 320 and the explosion-proof valve 210 is limited to 1mm-15mm, so that the second baffle 320 can block the adhesive and maintain a safe distance between the adhesive and the installation area of ​​the explosion-proof valve 210, while also satisfying the protective function of the second baffle 320 against the high-temperature gas ejected from the explosion-proof valve 210.

[0052] Furthermore, in some embodiments of this disclosure, the first baffle 310 and the second baffle 320 are vertically arranged, that is, for a pair of opposing first baffles 310 and second baffles 320, the included angle between them is 90°, so that the enclosure assembly 30 can form a rectangular closed frame structure. The vertically arranged first baffles 310 and second baffles 320 are simple to assemble and have a regular structure, and can be adapted to the rectangular configuration of the bottom of the battery pack 140. The assembler can easily achieve its precise positioning while maintaining the closed effect of the enclosure assembly 30, ensuring its blocking effect on the external adhesive of the explosion-proof valve 210 and its isolation effect on the internal high-temperature gas.

[0053] Regarding the specific structure of the first stop bar 310 and the second stop bar 320, in their extension direction, the first stop bar 310 and the second stop bar 320 can be set as a straight structure, a bent structure or a wave structure. In a specific embodiment of this disclosure, the first stop bar 310 and the second stop bar 320 are both regular rectangular structure stop bars, so as to facilitate production and use, and can be easily cut to meet the length requirements in actual use. Regarding the rectangular structure of the first baffle 310 and the second baffle 320, the end of the first baffle 310 abuts against the side wall of the second baffle 320. It should be noted that in this embodiment, the second baffle 320 is located on both sides of the explosion-proof valve 210 along its length. During the battery pack injection process, the two sides of the explosion-proof valve 210 along its length are the main adhesive blocking areas. Therefore, the end of the first baffle 310 abuts against the side wall of the second baffle 320 so that the gap formed by the first baffle 310 and the second baffle 320 is parallel to the length direction of the second baffle 320, rather than perpendicular to the length direction of the second baffle 320, thereby reducing the risk of adhesive leakage at the gap between the abutting first baffle 310 and the second baffle 320.

[0054] Furthermore, in the battery pack provided in the embodiments of this disclosure, such as Figure 13 As shown, the enclosure component 30 can be a one-piece structure or a split structure. In some embodiments, the two first baffles 310 and the two second baffles 320 in the enclosure component 30 are a one-piece structure, and the enclosure component 30 can be installed in a single installation during the assembly process. In addition, in the one-piece structure enclosure component 30, there are no gaps between the first baffles 310 and the second baffles 320, and the enclosure component 30 has a better sealing effect.

[0055] In other embodiments, such as Figure 12As shown, the enclosure component 30 can also be a partially separate, partially integrated structure. Specifically, in the enclosure component 30, the two first baffles 310 and one second baffle 320 are integrated into a U-shaped structure, meaning the U-shaped structure is directly assembled, while the other second baffle 320 is assembled separately to seal the opening area of ​​the U-shaped structure. Compared to a completely separate structure, the two first baffles 310 and one second baffle 320 of the U-shaped structure still reduce the assembly difficulty of the enclosure component 30. Furthermore, the independent second baffle 320 seals the opening of the U-shaped structure and allows for length adjustment based on assembly errors, ensuring a proper seal. In this embodiment, compared to a completely separate enclosure component 30, the assembly difficulty is reduced, while the independently configured second baffle 320 ensures a good seal through adaptive adjustment.

[0056] As for the separate enclosure components 30, such as Figure 7 and Figure 8 As shown, the first baffle 310 and the second baffle 320 achieve a sealing effect through a mating structure. In order to improve the sealing effect of the enclosure component 30, in some embodiments of this disclosure, the example of the end of the first baffle 310 mating with the side wall of the second baffle 320 is used for illustration. The side wall of the second baffle 320 is provided with a connecting groove 3210, and the first baffle 310 is partially embedded in the connecting groove 3210. The first baffle 310 embedded in the connecting groove 3210 has a more precise mating position compared with the abutting structure, and the connection groove 3210 is used to limit the movement and reduce the risk of displacement of the first baffle 310 relative to the second baffle 320, thereby improving the structural stability of the enclosure component 30.

[0057] It should also be noted that the embedded structure provides superior sealing performance between the first baffle 310 and the second baffle 320, and creates a longer gap path for the mating gap formed between them. If the single cell 20 experiences thermal runaway and high-temperature gas is ejected from the explosion-proof valve 210, and the enclosure component 30 leaks, the high-temperature gas must also traverse a longer mating gap to escape from the enclosure component 30, increasing the difficulty of the escape path and reducing the risk of high-temperature gas escape.

[0058] Furthermore, based on the above embodiments, in some embodiments, for the first stop bar 310 and the second stop bar 320 of the embedded mating structure, the connecting groove 3210 can be set as a groove structure with the same width as the first stop bar 310, and the first stop bar 310 is set by embedding its end into the connecting groove 3210 to achieve mating with the second stop bar 320. In other embodiments, the opening width of the connecting groove 3210 is smaller than the width of the first stop bar 310. Correspondingly, a protrusion 3110 is provided at the end of the first stop bar 310. The first stop bar 310 is embedded into the connecting groove 3210 through the protrusion 3110 to achieve a fitting with the second stop bar 320. Preferably, the width of the protrusion 3110 is the same as the width of the connecting groove 3210 to achieve a tight fit. At the same time, after the protrusion 3110 is embedded into the connecting groove 3210, one side wall of the protrusion 3110 contacts the bottom of the connecting groove 3210, ensuring that each area of ​​the fitting structure of the first stop bar 310 and the second stop bar 320 can maintain a sealing effect.

[0059] In some embodiments of this disclosure, such as Figure 9 As shown, the ends of the first stop bar 310 and the second stop bar 320 are both inclined structures, and a sealing fit is achieved through inclined docking. It should be noted that the inclined docking of the first stop bar 310 and the second stop bar 320 has a defined installation position, which improves the assembly accuracy of both. In some specific embodiments, both the first stop bar 310 and the second stop bar 320 are configured as isosceles trapezoidal structures with equal leg lengths, and they dock through the legs of the isosceles trapezoidal structure. Furthermore, the length extension directions of the first stop bar 310 and the second stop bar 320 remain perpendicular, resulting in a uniform assembly position for the enclosure component 30, improving the assembly uniformity of the enclosure component 30, and enhancing the similar functional effects of the enclosure components 30 in different positions.

[0060] To improve the sealing effect of the enclosure component 30, such as Figure 10 As shown, in some embodiments, the end of the first baffle 310 has at least two stepped structures, and correspondingly, the end of the second baffle 320 has the same number of stepped structures. The first baffle 310 and the second baffle 320 are engaged by the stepped structures. The engagement of at least two stepped structures makes the joint gap between the first baffle 310 and the second baffle 320 bend along a curved path. The high-temperature gas inside the enclosure component 30 needs to go through multiple turns during the escape process, and any turning area on any step remains sealed. This seals the joint gap between the first baffle 310 and the second baffle 320, making it more difficult for the high-temperature gas to escape and reducing the risk of leakage from the enclosure component 30 to the outside.

[0061] Furthermore, unlike the vertically arranged stepped structure, in some embodiments of this disclosure, the end of the first stop bar 310 can also be configured as a toothed structure, and the end of the second stop bar 320 is correspondingly toothed. The first stop bar 310 and the second stop bar 320 engage with each other through the toothed structures at their ends, which can also extend the mating gap between the first stop bar 310 and the second stop bar 320. At the same time, the engagement of the toothed structures can generate more complex interactive forces, thus providing a tighter structural connection between the first stop bar 310 and the second stop bar 320.

[0062] Furthermore, in some embodiments of this disclosure, such as Figure 11 As shown, the end of the first baffle 310 has a wave structure, that is, the edge of the end of the first baffle 310 is a reciprocating arc structure, and the end of the second baffle 320 has a corresponding wave structure. At the same time, the ends of the first baffle 310 and the second baffle 320 are fitted together. The continuous wave structure can extend the joint gap between the first baffle 310 and the second baffle 320. At the same time, the continuously fitted wave structure can maintain a tight seal throughout the entire path of high-temperature gas escape, thereby reducing the risk of high-temperature gas escape.

[0063] 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.

[0064] 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 housing (10) is divided into at least two battery compartments (120) by a partition beam (110). Each battery compartment (120) is provided with a bottom plate (130) and at least one battery pack (140) is provided on the bottom plate (130). Each battery pack (140) includes a plurality of individual cells (20) arranged along a first direction, and the first direction is perpendicular to the extension direction of the partition beam (110). An enclosure assembly (30) is disposed at the bottom of each of the battery packs (140), and an explosion-proof valve (210) is disposed at the bottom of each individual battery cell (20). The enclosure assembly (30) includes a pair of first baffles (310) arranged in parallel and spaced apart, and a pair of second baffles (320) arranged in parallel and spaced apart, the second baffles (320) extending along the first direction; the enclosure assembly (30) encloses all the explosion-proof valves (210) surrounding the bottom of a single battery pack (140). The enclosure component (30) further includes a barrier strip (330), which is disposed between two first baffles (310) and spaced apart from the second baffle (320) on either side. At least one barrier strip (330) is disposed between each two adjacent explosion-proof valves (210).

2. The battery pack as described in claim 1, characterized in that, The width of the first baffle (310) is greater than the width of the barrier (330).

3. The battery pack as described in claim 1, characterized in that, The width L1mm of the first stop bar (310) ranges from 5mm to 15mm.

4. The battery pack as described in claim 1, characterized in that, The barrier strip (330) is arranged perpendicular to the second stop strip (320), and the distance L2mm between the end of the barrier strip (330) and the second stop strip (320) on its nearest side is in the range of 1mm-5mm.

5. The battery pack as described in claim 1, characterized in that, A heat exchange plate is provided at the bottom of the base plate (130), and a first heat-conducting strip (340) is connected between the ends of the two second baffles (320). The two ends of the first heat-conducting strip (340) abut against the second baffles (320).

6. The battery pack as described in claim 5, characterized in that, It also includes a second heat-conducting strip (350), with at least one second heat-conducting strip (350) provided between every two adjacent explosion-proof valves (210).

7. The battery pack as described in claim 6, characterized in that, The distance L3mm between the end of the second heat-conducting strip (350) and the second baffle (320) on its nearest side ranges from 1mm to 5mm.

8. The battery pack as claimed in claim 1, characterized in that, The distance L4mm between the first stop bar (310) on one side and the nearest explosion-proof valve (210) ranges from 1mm to 20mm.

9. The battery pack as claimed in claim 1, characterized in that, Two second baffles (320) are disposed on both sides of the explosion-proof valve (210) along its length and are symmetrically arranged about the explosion-proof valve (210).

10. The battery pack as claimed in claim 9, characterized in that, The distance L5mm between the second stop bar (320) on one side and the explosion-proof valve (210) ranges from 1mm to 15mm.

11. The battery pack as claimed in claim 1, characterized in that, The first baffle (310) and the second baffle (320) are arranged vertically, and the enclosure component (30) is a rectangular closed frame structure.

12. The battery pack as claimed in claim 1, characterized in that, Both the first stop bar (310) and the second stop bar (320) are rectangular structure stop bars, and the end of the first stop bar (310) abuts against the side wall of the second stop bar (320).

13. The battery pack as claimed in claim 1, characterized in that, The second stop bar (320) has a connecting groove (3210) on its side wall, and the first stop bar (310) is partially embedded in the connecting groove (3210).

14. The battery pack as claimed in claim 13, characterized in that, The connecting groove (3210) has the same width as the first stop bar (310), and the end of the first stop bar (310) is embedded in the connecting groove (3210), or, The opening of the connecting groove (3210) is smaller than the width of the first stop bar (310). The first stop bar (310) is provided with a protrusion (3110), which is embedded in the connecting groove (3210) and contacts the bottom of the connecting groove (3210).

15. The battery pack as claimed in claim 1, characterized in that, The ends of the first stop bar (310) and the second stop bar (320) are both inclined structures and are inclinedly connected.

16. The battery pack as claimed in claim 1, characterized in that, The end of the first stop bar (310) is a stepped structure with at least two levels, and the end of the second stop bar (320) is a stepped structure with the same number of levels and engages with the first stop bar (310).

17. The battery pack as claimed in claim 1, characterized in that, The end of the first stop bar (310) is toothed, and the end of the second stop bar (320) is correspondingly toothed and meshes with the first stop bar (310).

18. The battery pack as claimed in claim 1, characterized in that, The end of the first baffle (310) is a wave structure, and the end of the second baffle (320) is a corresponding wave structure and is fitted to the first baffle (310).

19. The battery pack as claimed in claim 1, characterized in that, The two first baffles (310) and the two second baffles (320) are an integral structure.

20. The battery pack as claimed in claim 1, characterized in that, The two first baffles (310) and one second baffle (320) form a U-shaped structure, and the other second baffle (320) seals the opening of the U-shaped structure.

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