Battery packs and electrical equipment

Abstract

This disclosure relates to a battery pack and an electrical device. The battery pack includes multiple battery cells, a housing, and a stop structure. Each battery cell is provided with a pressure relief component. The multiple battery cells are disposed within the housing, and the housing has a pressure relief port opposite to the pressure relief component. The stop structure is connected to the housing and includes a first structural layer and a second structural layer stacked together. The first structural layer covers the pressure relief port and includes an insulating and heat-insulating layer and a weakened portion opposite to the pressure relief component. The second structural layer is used to seal the pressure relief port. The stop structure is configured such that when the pressure relief component thermally runs away, the weakened portion opposite to the pressure relief component and the second structural layer can rupture to form a pressure relief channel communicating with the pressure relief port. Through the above technical solution, the battery pack provided by this disclosure can reduce the possibility of short circuits caused by moisture entering the battery pack through the pressure relief port, thereby improving the safety of the battery pack.

Description

Technical Field

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

[0002] In related technologies, battery packs are usually equipped with pressure relief ports that are connected to the pressure relief components of individual battery cells. However, due to the design of the pressure relief ports, moisture can easily enter the battery pack through the pressure relief ports, causing a short circuit. Utility Model Content

[0003] The purpose of this disclosure is to provide a battery pack and electrical device that can reduce the possibility of short circuits caused by moisture entering the battery pack through a pressure relief port, thereby improving the safety of the battery pack.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a battery pack, comprising: a plurality of battery cells, each of which is provided with a pressure relief component; a housing, in which the plurality of battery cells are disposed, the housing having a pressure relief port opposite to the pressure relief component; and a stop structure connected to the housing and comprising a first structural layer and a second structural layer stacked thereon, the first structural layer covering the pressure relief port, the first structural layer including an insulating and heat-insulating layer and having a weakened portion opposite to the pressure relief component, the second structural layer for sealing the pressure relief port, the stop structure being configured such that when the pressure relief component thermally runs away, the weakened portion opposite to the pressure relief component and the second structural layer can rupture to form a pressure relief channel communicating with the pressure relief port, thereby reducing the possibility of, for example, water vapor entering the battery pack through the pressure relief port and causing a short circuit, thus helping to improve the safety of the battery pack.

[0005] In some possible implementations, the weakening part includes a serrated structure, which is simple in structure and easy to manufacture, and the serrated structure facilitates the formation of a pressure relief channel in the weakening part that communicates with the pressure relief port.

[0006] In some possible implementations, the pressure relief port includes a strip-shaped hole, and the scoring structure includes a main scoring. The main scoring extends parallel to the extension direction of the strip-shaped hole. Each end of the main scoring extends outward and divides into at least two branch scorings. This arrangement ensures that when the pressure relief component at the corresponding position thermally runs away, the scoring structure has a large stress-bearing area, so that the scoring structure opposite to the corresponding pressure relief component can break when the pressure relief component thermally runs away.

[0007] In some possible implementations, the notched structure extends through the first structural layer along its thickness direction, and the second structural layer covers the notched structure, in order to reduce the possibility of short circuits caused by moisture entering the battery pack through the pressure relief port, thereby improving the safety of the battery pack.

[0008] In some possible implementations, the insulating and heat-insulating layer includes a mica layer to reduce the possibility of thermal runaway spreading within the battery pack; and / or, the second structural layer includes a PET film to improve the sealing effect at the notched structure and reduce the possibility of thermal runaway spreading within the battery pack.

[0009] In some possible implementations, the housing includes a support plate and a bottom plate, the pressure relief port is disposed on the support plate, the plurality of battery cells are all supported on the support plate, the stop structure is disposed between the plurality of battery cells and the support plate, the bottom plate is located on the side of the support plate away from the battery cells, and an exhaust channel communicating with the pressure relief port is formed between the bottom plate and the support plate, so as to reduce the possibility of short circuits caused by, for example, water vapor entering the battery pack through the pressure relief port.

[0010] In some possible implementations, the first structural layer is located between the second structural layer and the support plate to reduce the possibility of short circuits caused by moisture entering the battery pack through the pressure relief port.

[0011] In some possible implementations, the first structural layer is bonded to the second structural layer; and / or, the first structural layer is bonded to the support plate, which provides high reliability and ease of installation.

[0012] In some possible implementations, the plurality of battery cells and the support plate are connected by an adhesive layer, and a baffle structure is also provided between the second structural layer and the plurality of battery cells. The baffle structure has a clearance opening to accommodate at least one of the pressure relief components. The baffle structure is used to isolate the pressure relief components from the adhesive layer, thereby reducing the risk of adhesive leakage, for example, during adhesive application or pressing.

[0013] In some possible implementations, a support structure is provided between the support plate and the base plate. The support structure has a first connecting surface connected to the support plate and a second connecting surface connected to the base plate, which can ensure that the support plate and the base plate have high structural strength.

[0014] A second aspect of this disclosure provides an electrical device including the battery pack provided in the first aspect.

[0015] Through the above-described technical solution, namely the battery pack provided in this disclosure, the battery pack improves the sealing effect by connecting the stop structure to the housing, arranging the first structural layer to cover the pressure relief port, and further sealing the pressure relief port with a second structural layer stacked on top of the first structural layer. This arrangement, through the stop structure, can block, for example, water vapor, reducing the possibility of water vapor entering the battery pack through the pressure relief port and causing a short circuit, thus contributing to improved battery pack safety. Furthermore, since the first structural layer includes an insulating and heat-insulating layer, it can provide insulation and heat insulation, effectively preventing, for example, emissions from a thermally runaway battery cell after the pressure relief device is opened from contacting other non-thermally runaway battery cells through the pressure relief port, thereby reducing the possibility of thermal runaway spreading within the battery pack. In addition, the first structural layer has a weakened portion opposite to the pressure relief component, so that when the pressure relief component is opened in thermal runaway, the weakened portion opposite to the pressure relief component and the second structural layer can be broken to form a pressure relief channel communicating with the pressure relief port, thereby achieving the purpose of pressure relief after thermal runaway of the battery pack.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this disclosure;

[0019] Figure 2 This is an exploded schematic diagram of a battery pack provided in an exemplary embodiment of this disclosure;

[0020] Figure 3 This is a top view of the battery pack after removing the cover and individual battery cells according to an exemplary embodiment of this disclosure;

[0021] Figure 4 yes Figure 3 Cross-sectional view at position AA;

[0022] Figure 5 yes Figure 4 A magnified view of a portion of position B in the middle section;

[0023] Figure 6 This is a schematic diagram of the battery cell, stop structure, and housing provided in an exemplary embodiment of this disclosure;

[0024] Figure 7 yes Figure 6A magnified view of a portion of the area at position C;

[0025] Figure 8 This is an exploded view of the stop structure provided in an exemplary embodiment of this disclosure;

[0026] Figure 9 This is a schematic diagram of the supporting structure of the battery pack after the bottom plate is removed, provided in an exemplary embodiment of this disclosure.

[0027] Figure 10 yes Figure 9 A magnified view of a portion of the area at position D.

[0028] Explanation of reference numerals in the attached figures

[0029] 1-Battery cell; 2-Pressure relief component; 3-Box body; 310-Pressure relief port; 311-Strip hole; 320-Support plate; 321-Liquid cooling plate; 3211-First plate; 3212-Second plate; 3213-Second flat plate; 3214-Second protrusion; 322-Flow channel; 330-Bottom plate; 340-Exhaust channel; 4-Stop structure; 410-Pressure relief area; 420-Pressure relief channel; 430-Weakening part; 431-Scratching structure; 4311-Main scratch; 4312-Branch scratch; 440-First structural layer; 450-Second structural layer; 5-Adhesive layer; 6-Glue-blocking structure; 610-Allowing opening; 620-Foam; 7-Support structure; 710-First connecting surface; 720-Second connecting surface; 730-First flat plate; 740-First protrusion; 8-Adhesive. Detailed Implementation

[0030] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0031] In this disclosure, unless otherwise stated, "inner" and "outer" refer to the inner and outer contours relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0032] According to a first aspect of this disclosure, a battery pack is provided, with reference to... Figures 1 to 10As shown, the battery pack includes multiple battery cells 1, a housing 3, and a stop structure 4. Each battery cell 1 is provided with a pressure relief component 2. The multiple battery cells 1 are disposed inside the housing 3, and the housing 3 is provided with a pressure relief port 310 opposite to the position of the pressure relief component 2. The stop structure 4 is connected to the housing 3 and includes a first structural layer 440 and a second structural layer 450 arranged in layers. The first structural layer 440 covers the pressure relief port 310 and includes an insulating and heat-insulating layer and a weakened portion 430 opposite to the position of the pressure relief component 2. The second structural layer 450 is used to seal the pressure relief port 310. The stop structure 4 is configured such that when the pressure relief component 2 thermally runs away and opens, the weakened portion 430 and the second structural layer 450 opposite to the position of the pressure relief component 2 can break to form a pressure relief channel 420 communicating with the pressure relief port 310.

[0033] Through the above-described technical solution, namely the battery pack provided in this disclosure, the battery pack improves the sealing effect by connecting the stop structure 4 to the housing 3 and by covering the pressure relief port 310 with the first structural layer 440, and further sealing the pressure relief port 310 with the second structural layer 450 stacked with the first structural layer 440. This arrangement, through the setting of the stop structure 4, can block, for example, water vapor, reducing the possibility of water vapor entering the battery pack through the pressure relief port 310 and causing a short circuit, thus contributing to improved battery pack safety. Furthermore, since the first structural layer 440 includes an insulating and heat-insulating layer, it can provide insulation and heat insulation, effectively preventing, for example, emissions from the pressure relief component 2 of a thermally runaway battery cell 1 from contacting other non-thermally runaway battery cells 1 through the pressure relief port 310, thereby reducing the possibility of thermal runaway spreading within the battery pack. In addition, the first structural layer 440 has a weakened portion 430 opposite to the pressure relief member 2, so that when the pressure relief member 2 is opened in thermal runaway, the weakened portion 430 opposite to the pressure relief member 2 and the second structural layer 450 can be broken to form a pressure relief channel 420 communicating with the pressure relief port 310, so as to achieve the purpose of pressure relief after the battery pack is in thermal runaway.

[0034] It should be noted that the aforementioned battery cell 1 can be in the form of a pouch battery cell, a prismatic battery cell, or a cylindrical battery cell, and this disclosure is not limited to these.

[0035] Considering that in order to facilitate the rupture of the weakened portion 430 corresponding to the position of the pressure relief component 2 when thermal runaway occurs, in some embodiments, reference is made to... Figures 5 to 8As shown, the stop structure 4 may include a pressure relief region 410 opposite to the pressure relief port 310 and / or the pressure relief component 2. The weakening part 430 is disposed in the pressure relief region 410. This arrangement is so as to enable the weakening part 430 opposite to the corresponding pressure relief component 2 to break when the pressure relief component 2 is thermally runaway open, so that the pressure relief component 2 and the pressure relief port 310 can be connected through the pressure relief channel 420.

[0036] The weakening portion 430 can be arranged in any suitable manner; for example, in some embodiments, refer to Figures 5 to 8 As shown, the weakening part 430 may include a notched structure 431, which is simple in structure and easy to manufacture. It is understood that, for example, the notched structure 431 can be machined at the pressure relief area 410 of the stop structure 4 by CNC (Computer Numerical Control) notching, so as to facilitate the pressure relief area 410 opposite to the corresponding pressure relief component 2 position to rupture when the pressure relief component 2 thermally runs away.

[0037] It should be noted that this disclosure does not specifically limit the shape and size of the above-mentioned groove structure 431. The purpose is to facilitate the rupture of the pressure relief area 410 opposite to the position of the corresponding pressure relief component 2 when the pressure relief component 2 is opened in thermal runaway. Those skilled in the art can design it adaptively according to actual application requirements.

[0038] For example, refer to Figure 8 As shown, the pressure relief port 310 may include a strip-shaped hole 311, and the scoring structure 431 may include a main scoring 4311. The extension direction of the main scoring 4311 is parallel to the extension direction of the strip-shaped hole 311. Both ends of the main scoring 4311 extend outward and divide into at least two branch scoring 4312. This arrangement ensures that when the pressure relief component 2 at the corresponding position thermally runs away, the scoring structure 431 has a large stress-bearing area, so that the pressure relief area 410 opposite to the corresponding position of the pressure relief component 2 can rupture when the pressure relief component 2 thermally runs away. This disclosure is not limited thereto.

[0039] It should be noted that this disclosure does not specifically limit the number of branch marks 4312 or the angle between any branch mark 4312 and the main mark 4311. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to facilitate the rupture of the pressure relief area 410 opposite to the position of the corresponding pressure relief component 2 when the pressure relief component 2 is opened in thermal runaway.

[0040] Additionally, in some implementations, references Figures 5 to 8As shown, the notch structure 431 can be disposed on the first structural layer 440 (i.e., it can be understood that the notch structure 431 can be disposed, for example, in the pressure relief region 410 of the first structural layer 440) and along the thickness direction of the first structural layer 440 (see reference). Figure 7 The first structural layer 440 is penetrated by the vertical direction of the middle section (or the height direction of the battery pack). The second structural layer 450 covers the grooved structure 431. This arrangement facilitates on-site processing and preparation, and also makes it easier to ensure that the pressure relief area 410 corresponding to the pressure relief component 2 can rupture and relieve pressure when the pressure relief component 2 is opened due to thermal runaway. Furthermore, the second structural layer 450 can seal the grooved structure 431, which helps to improve the sealing effect when the stop structure 4 covers the pressure relief port 310, and reduces the possibility of short circuits caused by water vapor or emissions from the pressure relief component 2 entering the battery pack through the pressure relief port 310.

[0041] In some embodiments, considering that the notched structure 431 (i.e., the weakened portion 430) is provided on the first structural layer 440, in order to facilitate the rupture of the pressure relief regions 410 of both the first structural layer 440 and the second structural layer 450 opposite to the corresponding pressure relief member 2 when the pressure relief member 2 is opened in thermal runaway, thereby achieving pressure relief, the maximum thickness of the second structural layer 450 can be configured to be less than the maximum thickness of the first structural layer 440. This arrangement, by thinning the second structural layer 450 relative to the first structural layer 440, facilitates the rupture of the pressure relief regions 410 of both the first structural layer 440 and the second structural layer 450 opposite to the corresponding pressure relief member 2 when the pressure relief member 2 is opened in thermal runaway. This disclosure is not limited thereto.

[0042] Exemplarily, in some implementations, reference is made to Figure 7 As shown, the maximum thickness of the first structural layer 440 can be 0.1mm-1mm, and further, the maximum thickness of the first structural layer 440 can be 0.2mm-0.5mm, for example, the maximum thickness of the first structural layer 440 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc., so as to facilitate the rupture of the pressure relief area 410 of the first structural layer 440, and also to facilitate the lightweight design of the entire battery pack. This disclosure is not limited thereto.

[0043] Additionally, in some implementations, references Figure 7As shown, the maximum thickness of the second structural layer 450 can be 0.1mm-0.3mm, and further, the maximum thickness of the second structural layer 450 can be 0.15mm-0.2mm, for example, the maximum thickness of the second structural layer 450 can be 0.15mm, 0.18mm, 0.2mm, etc., so as to facilitate the rupture of the pressure relief area 410 of the second structural layer 450, and also to facilitate the lightweight design of the entire battery pack. This disclosure is not limited thereto.

[0044] Of course, it is understood that the above-described embodiment of constructing the stop structure 4 as including a first structural layer 440 and a second structural layer 450 arranged in a stacked manner, and of providing the notching structure 431 in the first structural layer 440 and penetrating the first structural layer 440 along its thickness direction, is exemplary. For example, in some alternative embodiments not shown, the notching structure 431 may also be along the thickness direction of the first structural layer 440 (see reference...). Figure 7 The indentation in the middle (up and down direction) forms a groove-shaped structure. That is, it can be understood that the local part of the first structural layer 440 (e.g., at the location of the pressure relief area 410) can be thinned to weaken the pressure relief area 410 of the first structural layer 440, so as to facilitate the purpose of relieving pressure by causing the pressure relief area 410 opposite to the position of the corresponding pressure relief component 2 to rupture when the pressure relief component 2 is thermally runaway.

[0045] It should be noted that, for example, a groove structure arranged in a ring or a line (e.g., a straight line or a curve) can be machined on the first structural layer 440 using CNC (Computer Numerical Control) machining. That is, it can be understood that a local part of the first structural layer 440 (e.g., at the location of the pressure relief region 410) can be thinned by using a recess at the location of the pressure relief region 410 of the first structural layer 440, so as to facilitate the pressure relief region 410 opposite to the position of the pressure relief component 2 to rupture and relieve pressure when the pressure relief component 2 is thermally runaway.

[0046] In addition, it is understood that when the above-mentioned stop structure 4 is constructed to include a first structural layer 440 and a second structural layer 450 arranged in layers, and a groove structure 431 is provided in the first structural layer 440, and the groove structure 431 is recessed inward along the thickness direction of the first structural layer 440 to form a groove structure, the provision of the second structural layer 450 can also achieve the purpose of improving the sealing effect and reducing the possibility of short circuits caused by water vapor entering the battery pack through the pressure relief port 310.

[0047] Furthermore, in some embodiments, at least one of the first structural layer 440 and the second structural layer 450 may include insulating and heat-insulating materials. With such an arrangement, the first structural layer 440 and the second structural layer 450 can provide insulation and heat insulation, thereby achieving the effect of stably preventing the emissions (such as high-temperature and high-pressure gases, solid particles, and electrolyte liquids) emitted after the pressure relief device 2 of a thermally runaway battery cell 1 is opened from contacting other non-thermally runaway battery cells 1 through the pressure relief port 310, thereby reducing the possibility of thermal runaway spreading within the battery pack.

[0048] For example, in some embodiments, the insulating and heat-insulating layer of the first structural layer 440 may include, but is not limited to, a mica layer. Because mica has good insulation, high-temperature resistance, and flexibility, it can effectively prevent emissions (such as high-temperature, high-pressure gases, solid particles, and electrolyte liquids) emitted after the pressure relief device 2 of a thermally runaway battery cell 1 is opened from contacting other non-thermally runaway battery cells 1 through the pressure relief port 310, thereby reducing the possibility of thermal runaway spreading within the battery pack. This disclosure is not limited thereto.

[0049] In addition, in some embodiments, the second structural layer 450 may include, but is not limited to, a PET film (polyethylene terephthalate film). Because the PET film has good toughness and impact resistance, when the second structural layer 450 is stacked with the first structural layer 440, the sealing effect at the notched structure 431 can be improved, reducing the possibility of thermal runaway propagating within the battery pack. This disclosure is not limited thereto.

[0050] It should be noted that this disclosure does not specifically limit the location of the stop structure 4. Its purpose is to enable the stop structure 4 to be connected to the housing 3 and to cover each pressure relief port 310, thereby reducing the possibility of short circuits caused by moisture entering the battery pack. Therefore, it can be understood that the stop structure 4 can be adaptively set between the battery cell 1 and the support plate 320 of the housing 3 (described in detail below) and cover each pressure relief port 310. Alternatively, the stop structure 4 can also be adaptively set in the exhaust channel 340 of the housing 3 (described in detail below) and cover each pressure relief port 310. Alternatively, the stop structure 4 can be set between the battery cell 1 and the support plate 320 of the housing 3 and in the exhaust channel 340. This disclosure does not specifically limit such variations. Those skilled in the art can design them adaptively according to actual application requirements.

[0051] This disclosure is specifically described by way of example, with a stop structure 4 disposed between the battery cell 1 and the support plate 320 of the housing 3 and covering each pressure relief port 310:

[0052] For example, in some implementations, reference Figures 4 to 8 As shown, the housing 3 includes a support plate 320, a pressure relief port 310 which can be disposed on the support plate 320, and multiple battery cells 1 are supported on the support plate 320. A stop structure 4 is disposed between the multiple battery cells 1 and the support plate 320. By arranging the stop structure 4 between the multiple battery cells 1 and the support plate 320, it can not only block, for example, water vapor, reducing the possibility of water vapor entering the battery pack through the pressure relief port 310 and causing a short circuit, but also, when the stop structure 4 is constructed as, for example, an insulating material, it can also form an insulating layer between the battery cells 1 and the support plate 320, achieving the function of insulating and protecting the support plate 320 of the housing 3 through the stop structure 4. In this way, when the battery cell 1 experiences thermal runaway, it can reduce the possibility of emissions (such as conductive materials) ejected from the pressure relief component 2 directly contacting the support plate 320 of the housing 3, further reducing the possibility of insulation failure of the entire battery pack, and helping to improve the safety of the battery pack.

[0053] Furthermore, considering that in order to facilitate the rupture of the pressure relief regions 410 of the first structural layer 440 and the second structural layer 450 opposite to the corresponding pressure relief component 2 when the pressure relief component 2 is opened in a thermal runaway manner, thereby achieving pressure relief, in some embodiments, reference is made to... Figures 5 to 8 As shown, the stop structure 4 includes a first structural layer 440 and a second structural layer 450 stacked together. The first structural layer 440 is provided with a groove structure 431 that penetrates the first structural layer 440 along the thickness direction. When the second structural layer 450 covers the groove structure 431, the first structural layer 440 can be located between the second structural layer 450 and the support plate 320. This arrangement can reduce the possibility of short circuits caused by water vapor entering the battery pack through the pressure relief port 310, and also facilitates the rupture of the pressure relief areas 410 of the first structural layer 440 and the second structural layer 450 opposite to the corresponding pressure relief component 2 when the pressure relief component 2 is opened in thermal runaway.

[0054] Of course, it is understood that those skilled in the art can adapt the specific arrangement of the first structural layer 440 and the second structural layer 450 according to actual application needs. For example, in some alternative embodiments not shown, where the stop structure 4 includes a first structural layer 440 and a second structural layer 450 stacked together, and the first structural layer 440 is provided with a notch structure 431 penetrating the first structural layer 440 along the thickness direction, and the second structural layer 450 covers the notch structure 431, the second structural layer 450 can also be arranged between the first structural layer 440 and the support plate 320. This disclosure is not limited thereto.

[0055] In addition, in some embodiments, the first structural layer 440 can be bonded to the second structural layer 450, which is highly reliable and easy to install and operate.

[0056] In addition, in some embodiments, the first structural layer 440 can be bonded to the support plate 320, which is highly reliable and easy to install and operate.

[0057] In some implementations, reference Figures 5 to 8 As shown, multiple battery cells 1 and the support plate 320 can be connected by an adhesive layer 5 to stably connect the multiple battery cells 1 to the support plate 320. It should be noted that the adhesive layer 5 can be an adhesive layer formed by, for example, thermally conductive structural adhesive. This disclosure does not specifically limit the specific material of the thermally conductive structural adhesive, and those skilled in the art can design it adaptively according to actual application requirements.

[0058] Additionally, in some implementations, references Figures 5 to 8 As shown, a baffle structure 6 can also be provided between the second structural layer 450 and the plurality of battery cells 1. The baffle structure 6 has a clearance opening 610 for accommodating at least one pressure relief component 2. The baffle structure 6 is used to isolate the pressure relief component 2 from the adhesive layer 5. That is, it can be understood that, as Figure 7 As shown, the adhesive layer 5 can be located laterally to the stop structure 4 and the glue-blocking structure 6. This arrangement facilitates the blocking of the adhesive during processes such as applying adhesive or pressing, reducing the possibility of adhesive leaking into the exhaust channel 340 through the pressure relief port 310. This helps to ensure a stable connection between the battery cell 1 and the support plate 320 through the adhesive layer 5 formed by the adhesive, resulting in high reliability. Furthermore, it is understood that because the stop structure 4 and the glue-blocking structure 6 can block the adhesive, the possibility of adhesive leakage and contact with the pressure relief component 2 of the battery cell 1 during processes such as applying adhesive or pressing can be reduced. This reduces the risk of adhesive overflowing onto the pressure relief component 2 and affecting its thermal runaway opening.

[0059] Those skilled in the art can adapt the specific structure and material of the adhesive-blocking structure 6 according to actual application needs. This disclosure does not impose specific limitations in this regard. For example, in some embodiments, refer to Figures 5 to 8As shown, the adhesive-blocking structure 6 may include foam 620. Exemplarily, the foam 620 may include, but is not limited to, melamine foam. Because foam 620 has good sealing performance, it can effectively block the adhesive, reducing the risk of leakage during processes such as adhesive application or pressing. Furthermore, because foam 620 has good air permeability, it can release gas during processes such as pressing to facilitate the compression and creep deformation of the thermally conductive structural adhesive. Additionally, because foam 620 has good compressibility, it facilitates a tight fit between the battery cell 1 and foam 620 during processes such as pressing, improving the sealing effect and reducing the risk of adhesive leakage.

[0060] Furthermore, it should be noted that this disclosure does not specifically limit the specific structure, dimensions, or quantity of the aforementioned adhesive-blocking structure 6 and stop structure 4. Those skilled in the art can adapt the design according to actual application requirements. For example, in some embodiments, reference... Figures 2 to 8 As shown, the adhesive-blocking structure 6 and the stop structure 4 can be along the first direction (refer to...). Figure 3 The left and right directions in the middle of the image (or you can refer to the length direction of the battery pack) and / or the second direction (you can refer to...) Figure 3 The structures (either vertically or, as can be referenced, in the width direction of the battery pack) are arranged in multiple groups, and each group of sealing structures 6 can have multiple clearance openings 610 to accommodate multiple pressure relief components 2, while each group of stop structures 4 can cover multiple pressure relief openings 310. This disclosure is not limited thereto.

[0061] In some implementations, reference Figures 4 to 8 As shown, the housing 3 may include a base plate 330, which is located on the side of the support plate 320 away from the battery cell 1. An exhaust channel 340 is formed between the base plate 330 and the support plate 320, which is connected to the pressure relief port 310. The housing 3 may also be provided with a discharge port (not shown), and a pressure relief structure (not shown) is provided at the discharge port. This arrangement allows the exhaust channel 340 to be connected to the outside of the housing 3 through a pressure relief structure (such as an explosion-proof valve, a pressure relief valve, or a safety valve), so that pressure relief can be achieved in the exhaust channel 340 by opening the pressure relief structure when the battery pack experiences thermal runaway.

[0062] Considering that during the pressing process, in order to quickly flatten, for example, thermally conductive structural adhesives, in some embodiments, reference is made to... Figures 2 to 10As shown, a support structure 7 can be provided between the support plate 320 and the base plate 330. The support structure 7 has a first connecting surface 710 connected to the support plate 320 and a second connecting surface 720 connected to the base plate 330. Thus, by providing the support structure 7, it is possible to ensure that the support plate 320 and the base plate 330 have high structural strength during processes such as pressing, for example, by placing the bottom wall of the base plate 330 on a support fixture (not shown) and applying pressure to the top wall of multiple battery cells 1. Furthermore, the double-sided force and the creep of the adhesive can facilitate the rapid flattening of, for example, thermally conductive structural adhesive.

[0063] It should be noted that this disclosure does not specifically limit the specific structure and quantity of the aforementioned support structure 7. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to achieve stable support for the support plate 320 and the base plate 330 through the support structure 7. For example, in some embodiments, refer to Figure 9 and Figure 10 As shown, the support structure 7 can be along the first direction (refer to...). Figure 3 The support structure 7 is arranged in multiple ways (either in the left-right direction or along the length of the battery pack) at intervals. Each support structure 7 has multiple first flat plate portions 730 arranged side by side along the second direction, and a first protrusion 740 connecting two adjacent first flat plate portions 730. The first protrusion 740 includes a first connecting surface 710, and the first flat plate portion 730 includes a second connecting surface 720. Thus, the support structure 7 is supported on the support plate 320 by the multiple first connecting surfaces 710 and on the bottom plate 330 by the multiple second connecting surfaces 720, ensuring a large support area. This helps to ensure that the support plate 320 and the bottom plate 330 have high structural strength. Furthermore, the double-sided force and the creep of the adhesive make it easy to quickly flatten, for example, the thermally conductive structural adhesive.

[0064] Additionally, in some embodiments, in order to ensure that the support structure 7 is stably connected to the support plate 320 and the base plate 330, reference is made to... Figure 9 and Figure 10 As shown, the first connecting surface 710 can be bonded to the support plate 320 by, for example, adhesive 8, and the second connecting surface 720 can also be bonded to the base plate 330 by, for example, adhesive 8. This arrangement can stably connect the support structure 7 to the support plate 320 and the base plate 330, which is highly reliable and easy to install and operate.

[0065] Furthermore, in some implementations, references Figure 9 and Figure 10As shown, the support plate 320 may include a liquid cooling plate 321, which can be used to cool the battery cell 1 and also to cool down the battery pack in the event of thermal runaway. For example, the liquid cooling plate 321 may include a first plate 3211 and a second plate 3212 stacked together. The first plate 3211 is connected to the stop structure 4. The second plate 3212 includes a second flat plate portion 3213 connected to the first plate 3211 and a second protrusion portion 3214 protruding away from the first plate 3211, forming a flow channel 322 for fluid flow between the corresponding second protrusion portion 3214 and the first plate 3211. A pressure relief port 310 may be provided on the first plate 3211 and the second plate 3212. This arrangement not only allows for cooling down the battery cell 1 through the liquid cooling plate 321 but also for pressure relief, resulting in a high degree of integration.

[0066] In addition, such as Figure 9 and Figure 10 As shown, the first protrusion 740 of the support structure 7 can be connected to the second flat plate 3213 through the first connecting surface 710. With this arrangement, the support structure 7 can be tightly fitted to the liquid cooling plate 321 through the contour design of the support structure 7 and the liquid cooling plate 321, so as to ensure that the support plate 320 and the base plate 330 have high structural strength.

[0067] In addition, in some embodiments, the support structure 7 may be provided with a reinforcing rib structure to improve the structural strength of the support structure 7.

[0068] According to a second aspect of this disclosure, an electrical appliance is provided, which includes the battery pack provided in the first aspect. Furthermore, the electrical appliance possesses all the beneficial effects of the battery pack provided in the first aspect, which will not be elaborated further herein.

[0069] In some exemplary application scenarios, the aforementioned electrical equipment can be a vehicle, wherein the vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc., and this disclosure does not make any specific limitations in this regard.

[0070] Of course, in other application scenarios, the above-mentioned electrical equipment can also be used for vehicles that need to be powered by battery packs, such as in the field of energy storage, aerospace or water transportation.

[0071] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0072] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0073] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells, each of which is equipped with a pressure relief device; The housing contains the plurality of battery cells, and the housing has a pressure relief port that is opposite to the position of the pressure relief component. as well as A stop structure is connected to the housing and includes a first structural layer and a second structural layer stacked together. The first structural layer covers the pressure relief port. The first structural layer includes an insulating and heat-insulating layer and has a weakened portion opposite to the pressure relief component. The second structural layer is used to seal the pressure relief port. The stop structure is configured such that when the pressure relief component is thermally runaway open, the weakened portion opposite to the pressure relief component and the second structural layer can rupture to form a pressure relief channel communicating with the pressure relief port.

2. The battery pack of claim 1, wherein, The weakened portion includes a serrated structure.

3. The battery pack of claim 2, wherein, The pressure relief port includes a strip-shaped hole, and the serrated structure includes a main serration. The extension direction of the main serration is parallel to the extension direction of the strip-shaped hole, and the two ends of the main serration extend outward and divide into at least two branch serrations.

4. The battery pack of claim 2, wherein, The etched structure penetrates the first structural layer along the thickness direction of the first structural layer, and the second structural layer covers the etched structure.

5. The battery pack of claim 1, wherein, The insulating and heat-insulating layer includes a mica layer; and / or, The second structural layer includes a PET film.

6. The battery pack of any one of claims 1-5, wherein, The housing includes a support plate and a bottom plate. The pressure relief port is located on the support plate. The multiple battery cells are all supported on the support plate. The stop structure is located between the multiple battery cells and the support plate. The bottom plate is located on the side of the support plate away from the battery cells. An exhaust channel communicating with the pressure relief port is formed between the bottom plate and the support plate.

7. The battery pack of claim 6, wherein, The first structural layer is located between the second structural layer and the support plate.

8. The battery pack of claim 7, wherein, The first structural layer is bonded to the second structural layer; and / or, The first structural layer is bonded to the support plate.

9. The battery pack of claim 7, wherein, The plurality of battery cells and the support plate are connected by an adhesive layer. A baffle structure is also provided between the second structural layer and the plurality of battery cells. The baffle structure has a clearance opening to accommodate at least one of the pressure relief components. The baffle structure is used to isolate the pressure relief component from the adhesive layer.

10. The battery pack of claim 6, wherein, A support structure is provided between the support plate and the base plate. The support structure has a first connecting surface connected to the support plate and a second connecting surface connected to the base plate.

11. An electrical device, characterized by Includes the battery pack described in any one of claims 1-10.

Images