A battery pack

Abstract

The application relates to the battery technical field and discloses a battery pack, which comprises at least two spaced battery groups, a single battery group comprises at least two single batteries, the single battery comprises a first surface and a second surface located at two ends in the height direction of the single battery, the first surface is provided with an explosion-proof valve; an isolation assembly is at least partially arranged between the two battery groups, the isolation assembly comprises a connecting part and an isolation part which are arranged in a bending mode, the connecting part is at least partially overlapped on the first surface, the isolation part is embedded in the gap between the two battery groups and extends from the first surface to the second surface; in the direction perpendicular to the first surface, the height of the isolation part is h1 mm, the height of the single battery is h2 mm, and the range of h1 / h2 is 0.05-0.4. The isolation part disclosed by the application extends to the second surface based on the first surface provided with the explosion-proof valve, heat transfer isolation is conducted on the first surface with high temperature during thermal runaway, and the risk of thermal runaway spreading 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] A battery pack is a unit consisting of multiple individual cells. In order to improve the energy density of the battery pack, the arrangement of multiple individual cells is becoming more and more dense. In the structure of densely arranged individual cells, when a single individual cell experiences thermal runaway, heat can easily spread rapidly between multiple individual cells, causing a large number of individual cells to lose control and resulting in a major thermal runaway accident in the battery pack. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack to reduce the impact of thermal runaway regions within the battery pack on adjacent individual cells.

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

[0005] A battery pack, comprising:

[0006] At least two battery packs are arranged at intervals, and each battery pack includes at least two individual cells. Each individual cell includes a first surface and a second surface located at both ends in its height direction. An explosion-proof valve is provided on the first surface.

[0007] An isolation component is at least partially disposed between the two battery packs. The isolation component includes a bent connecting portion and an isolation portion. The connecting portion at least partially overlaps a first surface, and the isolation portion is embedded in the gap between the two battery packs and extends from the first surface to a second surface. Along a direction perpendicular to the first surface, the height of the isolation portion is h1 mm, the height of the individual battery is h2 mm, and the range of h1 / h2 is 0.05-0.4.

[0008] As can be seen from the above technical solution, one aspect of this disclosure provides a battery pack, which includes at least two spaced-apart battery groups, each containing at least two individual cells. Each battery group also includes an isolation component. The isolation component overlaps on the first surface of the individual cells via a connecting portion to maintain a limiting effect, and is embedded in the gap between the two individual cells. The isolation portion and the connecting portion have a bent structure, allowing the isolation portion to extend from the first surface of the individual cell to the second surface. For the first surface equipped with an explosion-proof valve, during the thermal runaway process of the individual cell… The first surface where the explosion-proof valve is located has a high temperature, which gradually decreases towards the second surface. The isolation section extending from the first surface to the second surface can effectively insulate the key areas near the first surface, reducing the risk of heat being transferred from the explosion-proof valve to the surrounding area due to runaway, and preventing the spread of thermal runaway between multiple individual cells. At the same time, the ratio h1 / h2 of the height h1mm of the isolation section to the height h2mm of the individual cell is limited to a range of 0.05-0.4 to balance the heat insulation effect of the isolation section on the individual cell and the weight of the isolation section, ensuring that the isolation section maintains a good and stable shape to meet the heat insulation function. 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 a battery pack according to an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of the assembly of an isolation component and a single battery cell according to an embodiment of the present invention;

[0012] Figure 3 A schematic diagram of an isolation component embedded between two adjacent single cells according to an embodiment of the present invention;

[0013] Figure 4 for Figure 3 A forward-facing diagram;

[0014] Figure 5 for Figure 3 A top-down view;

[0015] Figure 6 This is a schematic diagram of the structure of the isolation component and the single battery before assembly according to an embodiment of the present invention;

[0016] Figure 7 A schematic diagram of the connection portion and the two side single battery cells provided in an embodiment of the present utility model;

[0017] Figure 8 This is a schematic diagram of the structure of the filler provided in one embodiment of the present utility model.

[0018] in:

[0019] 10-Battery pack; 20-Single cell; 210-First surface; 220-Second surface; 230-Explosion-proof valve; 30-Isolation assembly; 310-Connecting part; 320-Isolation part; 40-Filling element. Detailed Implementation

[0020] The core of this application is to disclose a battery pack that reduces the impact of thermal runaway regions within the battery pack on adjacent individual cells.

[0021] 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.

[0022] like Figure 1 As shown, one aspect of this disclosure provides a battery pack. It should be noted that the battery pack, as a rechargeable battery, is the power source for new energy vehicles. Specifically, it includes a battery pack composed of multiple battery cells, which are combined in series and parallel or both to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage and low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components. The above components are placed in a housing, which is divided into upper and lower parts and sealed together, specifically by a cover plate, forming a complete functional unit that can directly output electrical energy.

[0023] like Figure 1 and Figure 2As shown in the embodiments provided in this disclosure, the battery pack includes at least two battery packs 10 spaced apart. It should be noted that the battery pack 10 is formed by multiple individual cells 20 with equivalent capacity and internal resistance connected in series or in parallel. The two battery packs 10 can be isolated by a partition beam, thereby reducing the risk of thermal runaway propagation between the two battery packs 10. Each battery pack 10 includes at least two individual cells 20 and is electrically connected by a busbar. It should be noted that the individual cell 20 can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable batteries, the active materials can be activated by charging after discharge and continue to be used. The individual cell 20 typically includes a casing and a cell disposed within the casing.

[0024] Specifically, the single cell 20 includes a first surface 210 and a second surface 220 located at both ends in its height direction. The first surface 210 is provided with an explosion-proof valve 230. In some embodiments, the vertical height of the first surface 210 is higher than that of the second surface 220, that is, the first surface 210 is the top surface of the single cell 20, so that the status of the explosion-proof valve 230 can be directly observed after the battery pack cover is opened.

[0025] It should be noted that the explosion-proof valve 230 refers to an element or component that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a single cell 20 reaches a predetermined threshold. During battery use, the explosion-proof valve 230 is mainly used to allow gas to escape from the battery to reduce internal pressure in order to prevent excessive increase in internal pressure and thus prevent the battery from deforming or exploding when thermal runaway or other situations occur. The material of the explosion-proof valve 230 is not limited, including but not limited to aluminum, steel, alloys, etc. The shape of the explosion-proof valve 230 is not limited, such as square, oblong, elliptical, racetrack-shaped, etc. The type of explosion-proof valve 230 is not limited, such as a serrated explosion-proof valve, which can be formed by stamping or laser etching.

[0026] It should also be noted that during the thermal runaway process of the single cell 20, high-temperature gas is ejected from the explosion-proof valve 230. The first surface 210 is a high-temperature surface, and heat will spread from the first surface 210 to the second surface 220 and the sidewalls of the adjacent single cell 20.

[0027] Based on this, the isolation component 30 is at least partially disposed in the gap region between the two battery packs 10 to separate two adjacent rows of individual cells 20 in the two battery packs 10. Specifically, the isolation component 30 includes a connecting portion 310 and an isolation portion 320, which are bent and continuously disposed. At least a portion of the structure of the connecting portion 310 overlaps with the first surface 210, so that the isolation component 30 makes contact with the individual cell 20 through the connecting portion 310, thereby ensuring that the isolation component 30 has an accurate assembly position. The isolation portion 320 is embedded in the gap between the two individual cells 20 to utilize the gap between the individual cells 20 and reduce the space occupied by the isolation component 30 in the battery pack. The above structure allows the isolation portion 320 to extend from the first surface 210 to the second surface 220 of the individual cell 20.

[0028] It should be noted that the first surface 210, which is equipped with the explosion-proof valve 230, is a high-temperature surface during the thermal runaway of a single cell 20. For a single cell 20, the heat during thermal runaway extends from the first surface 210 to the second surface 220. For adjacent cells 20, the temperature of the thermally runaway cell 20 is transferred from the first surface 210 to the battery sidewall and then to the adjacent cells. Therefore, in this embodiment, the isolation part 320 is configured to extend from the first surface 210 to the second surface 220, which can effectively insulate the key area near the first surface 210. This blocks the path of heat transfer from a single cell 20 to the second surface 220, reducing the risk of further runaway of a single cell 20. It also reduces the risk of heat spreading from the sidewall to adjacent cells 20, thus preventing the spread of thermal runaway among multiple cells 20 and improving the safety of the battery pack.

[0029] Based on the above structure, in some embodiments of this disclosure, such as Figure 3 and Figure 4As shown, along the direction perpendicular to the first surface 210, i.e., the height direction of the single cell 20, the height of the isolation portion 320 is h1 mm, and the height of the single cell 20 is h2 mm. The range of h1 / h2 is 0.05-0.4, specifically 0.05, 0.12, 0.19, 0.25, 0.32, or 0.4. It should be noted that if h1 / h2 is less than 0.05, the protective area of ​​the isolation portion 320 in the height direction of the single cell 20 is relatively small. In the event of thermal runaway of the single cell 20, the protective structure of the isolation portion 320 is too small to effectively block heat, resulting in insufficient heat insulation effect of the isolation component 30, and thus still posing a significant risk of thermal runaway propagation. Conversely, if h1 / h2 is greater than 0.05, the protective area of ​​the isolation portion 320 in the height direction of the single cell 20 is relatively small. If the ratio is 0.4, the insulation portion 320 will be too long, resulting in excessive weight. This will put significant load on the connecting portion 310 that overlaps with the first surface 210, posing a risk of deformation due to excessive load. Deformation of the connecting portion 310 will cause slippage of the contact area with the first surface 210, leading to positioning deviation of the insulation component 30. Consequently, the insulation portion 320 will not be able to accurately act on the heat transfer path on the first surface 210, affecting the blocking of heat spread. Therefore, this embodiment limits the range of h1 / h2 to 0.05-0.4 to balance the heat insulation performance and positioning accuracy of the insulation portion 320, thereby improving the effectiveness of the insulation component 30 in blocking heat spread.

[0030] Furthermore, for the battery pack provided in this embodiment, the individual battery 20 can be a prismatic battery or a cylindrical battery. For a prismatic battery, the area where the connecting part 310 overlaps with the first surface 210 can be rectangular, with the edges of the first surface 210 having the same span. For a cylindrical battery, the area where the connecting part 310 overlaps with the first surface 210 can be set as a partial annular structure, and is concentrically set with the circular structure of the first surface 210, with the edges of the first surface 210 having the same span, thereby improving the uniformity and stability of the overlap between the connecting part 310 and the first surface 210.

[0031] Based on the above embodiments, for the connecting part 310, for a single overlapped cell 20 in the single-sided battery pack 10, the overlap area of ​​the connecting part 310 on its first surface 210 has a span of d1mm along the width direction of the single cell 20, and the width dimension of the first surface 210 is d2mm. Then the range of d1 / d2 is 0.02-0.2, specifically 0.02, 0.04, 0.05, 0.08, 0.12, 0.15, 0.18 or 0.2. It should be noted that for the isolation component 30, the overlapping area of ​​its connecting part 310 on the first surface 210 is the basis for achieving accurate and stable positioning of the isolation component 30. If d1 / d2 is less than 0.02, the positioning effect of the isolation component 30 is poor, and there is a significant risk of deviation between the connecting part 310 and the first surface 210, resulting in a difference between the setting of the isolation part 320 and the preset position, thus failing to effectively achieve the heat insulation effect. Conversely, if d1 / d2 is greater than 0.2, the connecting part 310 will occupy a larger area on the first surface 210, and its... This could cause the explosion-proof valve 230 to approach or intrude into the clearance area above it, resulting in resistance during the explosion process and affecting the pressure relief effect of the individual battery 20, thus posing a risk of explosion of the individual battery 20. Therefore, the range of d1 / d2 is limited to 0.02-0.2 to ensure that the isolation component 30 can achieve stable and accurate positioning through the overlap between the connecting part 310 and the first surface 210, while avoiding an excessively large overlap area of ​​the connecting part 310 on the first surface 210, which could affect the smooth explosion of the explosion-proof valve 230 and improve the safety of the battery pack during operation.

[0032] It should be noted that in some embodiments of this disclosure, the range of d1mm is 0.6mm-8mm, specifically 0.6mm, 1.5mm, 2mm, 4mm, 6mm or 8mm; while the range of d2mm is 30mm-80mm, specifically 30mm, 40mm, 50mm, 60mm, 70mm or 80mm.

[0033] Furthermore, such as Figure 4 and Figure 6As shown, in the battery pack provided in this embodiment, the gap d3mm between two adjacent individual cells 20 ranges from 1mm to 6mm, specifically 1mm, 2mm, 3mm, 4mm, 5mm, or 6mm. For a battery pack with multiple individual cells 20, if the gap between two adjacent individual cells 20 is greater than 6mm, the number of individual cells 20 in the battery pack will decrease, and the energy density of the battery pack will decrease. At the same time, an excessively large gap will result in a larger thickness of the isolation portion 320 embedded between two individual cells 20, increasing the cost of the isolation component 30, and the connection portion 310 is prone to deformation, which may lead to the isolation component 30 failing. If the gap between two adjacent individual cells 20 is less than 1mm, the heat transfer path between adjacent individual cells 20 will be shortened. In the event of thermal runaway of a single individual cell 20, the thinness of the isolation portion 320 will prevent effective heat isolation, which may also lead to the spread of thermal runaway. Therefore, in this embodiment, the gap d3mm between two adjacent single cells 20 is limited to 1mm-6mm to ensure that the isolation component 30 can effectively isolate the heat transfer between adjacent single cells 20 while maintaining the energy density of the battery pack, thereby reducing the risk of thermal runaway propagation within the battery pack.

[0034] Based on the above embodiments, the gap d3mm between two adjacent single cells 20 is the thickness of the isolation portion 320 after installation between the two single cells 20. In order to achieve a dense embedding of the isolation portion 320 between the two single cells 20, in some embodiments of this disclosure, the isolation portion 320 is an elastic structure and is embedded between two adjacent single cells 20 after compression to maintain a dense filling effect.

[0035] Furthermore, such as Figure 6 As shown, in some embodiments, the thickness of the insulating portion 320 before compression is d4mm, while the range of d3 / d4 is 0.25-0.75, specifically 0.25, 0.35, 0.45, 0.55, 0.65, or 0.75. It should be noted that if d3 / d4 is less than 0.25, the insulating portion 320 has sufficient compression, but the large difference between its pre-compression size and the gap between the two individual battery cells 20 increases the assembly difficulty of the insulating portion 320. Conversely, if d3 / d4 is greater than 0.75, the pre-compression size of the insulating portion 320 is close to the gap between the two individual battery cells 20, resulting in insufficient compression and inability to achieve dense filling, thus affecting its thermal insulation performance. Therefore, this embodiment limits the range of d3 / d4 to 0.25-0.75 to balance the assembly difficulty of the insulating portion 320 and its thermal insulation performance for adjacent individual battery cells 20.

[0036] It should be noted that in some embodiments, d4mm ranges from 1.4mm to 8mm, and can specifically be 1.4mm, 3mm, 4.5mm, 6mm, 7.5mm or 8mm.

[0037] Based on the above embodiments, the insulating portion 320 includes a solid silicone inner layer in its thickness direction, giving it good elasticity to meet embedding requirements and a certain degree of high-temperature resistance. The insulating portion 320 also includes a ceramic silicone rubber outer layer. Under open flame or high-temperature conditions, the ceramic silicone rubber can sinter into a self-supporting ceramic body, preventing the spread and transmission of flame and high temperature, thus providing stable thermal insulation for the insulating portion 320. It should be noted that the ceramic silicone rubber can be disposed on one side of the inner solid silicone layer or on both sides in the thickness direction of the inner solid silicone layer to enhance the thermal insulation effect of the insulating portion 320.

[0038] Furthermore, in the battery pack provided in this embodiment, the connecting portion 310 serves as the basis for positioning and assembling the isolation component 30 on the individual battery 20. It can be disposed on one or both sides of the isolation portion 320. In some embodiments, the connecting portion 310 is bent and disposed on one side of the isolation portion 320, overlapping and fixed with the first surface 210 on that side. That is, the connecting portion 310 is only limited and connected to the first surface 210 of a single individual battery 20. This allows the assembly of the isolation component 30 to have a smaller structural impact on the battery pack, avoiding the impact on the heat release of the explosion-proof valve 230 on the other side, while also reducing the difficulty of setting up the isolation component 30. It should also be noted that in some preferred embodiments, the connecting portion 310 and the isolation portion 320 are arranged vertically, so that the isolation component 30 has an L-shaped cross-section. The vertically arranged connecting portion 310 and isolation portion 320 allow all areas of the connecting portion 310 to overlap with the first surface 210, improving the utilization efficiency of the connecting portion 310 and reducing the overall space occupied by the isolation component 30.

[0039] In other embodiments, such as Figure 7 As shown, the connecting portion 310 is bent and disposed on both sides of the insulating portion 320. Simultaneously, the connecting portion 310 can overlap and be fixed to the two first surfaces 210 of two adjacent individual battery cells 20 respectively. Compared to a single-sided overlap structure, this provides a more stable overlap effect, thus improving the stability of the insulating assembly 30 during use. It should also be noted that in some preferred embodiments, the connecting portion 310 and the insulating portion 320 are vertically arranged, so that the insulating assembly 30 has a T-shaped cross-section. The vertically arranged connecting portion 310 and the insulating portion 320 allow all areas of the connecting portion 310 to overlap with the two first surfaces 210 on both sides, further improving the efficiency of the connecting portion 310.

[0040] Furthermore, based on the above embodiments, for the T-shaped isolation component 30, such as Figure 7 As shown, the overlap area width between the connecting part 310 and the first surface 210 on one side of the isolation part 320 is d5mm, while the overlap area width between the connecting part 310 and the first surface 210 on the other side of the isolation part 320 is d6mm. Therefore, the range of d5 / d6 is 0.9-1.1, specifically 0.9, 0.95, 1.0, 1.05, or 1.1. It should be noted that the connecting part 310 is used to support the weight of the isolation part 320 so that the isolation part 320 can be stably positioned between the two individual battery cells 20. And if d5... If the range of d5 / d6 is less than 0.9 or greater than 1.1, the width difference of the connecting portions 310 on both sides of the isolation portion 320 is large, and the isolation component 30 still has a large risk of skewness. This would prevent the isolation portion 320 from being stably embedded between the two individual cells 20 and would reduce its heat insulation effect. Therefore, the range of d5 / d6 is limited to 0.9-1.1 to ensure the stability of the support effect of the connecting portion 310 on the isolation portion 320, so that the isolation portion 320 has a stable structural bearing foundation and can perform its heat insulation function smoothly.

[0041] It should be noted that in some embodiments of this disclosure, d5mm ranges from 0.4mm to 7mm, specifically 0.4mm, 1.5mm, 2.5mm, 3.5mm, 5mm, 6mm, or 7mm; correspondingly, d6mm ranges from 0.4mm to 7mm, specifically 0.4mm, 1.5mm, 2.5mm, 3.5mm, 5mm, 6mm, or 7mm.

[0042] Furthermore, it should be noted that for the T-shaped isolation component 30, in some preferred embodiments, the connecting portion 310 is located in the area on both sides of the isolation portion 320 and is symmetrically arranged about the isolation portion 320. This not only enables the connecting portion 310 on both sides of the isolation portion 320 to provide uniform support for the isolation portion 320, but also allows the isolation component 30 to have a higher degree of assembly freedom during the assembly process without having to distinguish between the positive and negative directions, thus improving its assembly convenience.

[0043] In the above embodiment, since the overlap between the connecting portion 310 and the first surfaces 210 on both sides can provide a more stable bearing base for the isolation portion 320 and reduce the risk of deformation of the isolation portion 320 due to gravity, in this embodiment, the range of h1 / h2 is 0.1-0.4, specifically 0.1, 0.2, 0.3 or 0.4. It should be noted that the overlapping structure on both sides allows the isolation portion 320 to have a larger installation area in the height direction of the single cell 20. By extending the height of the isolation portion 320, it can achieve heat insulation protection for a larger area on the single cell 20. At the same time, the connecting portion 310 on both sides ensures the structural stability of the isolation portion 320, thereby further improving the heat insulation effect of the isolation component 30 on the adjacent single cell 20 compared with the aforementioned embodiment.

[0044] Furthermore, such as Figure 8 As shown, the battery pack provided in this embodiment also includes a filler 40. Both the insulating portion 320 and the filler 40 are disposed in the gap region between two individual cells 20. The filler 40 can achieve a certain heat insulation effect in other areas of the gap between the two individual cells 20, thereby improving the overall heat insulation effect. Simultaneously, the filler 40 provides support for the insulating portion 320. When the connecting portion 310 deforms, causing the insulating portion 320 to slide down along the gap between the individual cells 20, the filler 40 can support the insulating portion 320, ensuring that the insulating portion 320 still maintains a good structural shape and has a heat insulation effect. It should also be noted that along the height direction of the individual cell 20, the filler 40 can be spaced apart from the insulating portion 320 to support the insulating portion 320 after it undergoes a certain deformation. Similarly, the filler 40 can also be directly connected to the insulating portion 320 to provide effective structural support, thereby improving the stability of the insulating portion 320.

[0045] In some embodiments of this disclosure, along the height direction of the single cell 20, the filler 40 extends from the second surface 220 toward the first surface 210 and is spaced apart from the isolation portion 320. The filler 40 from the second surface 220 has a stable structural foundation, which reduces the risk of its own deformation. The spaced arrangement with the isolation portion 320 ensures that the filler 40 and the isolation portion 320 have sufficient assembly clearance, so that the high precision requirements of the structural processing will not be caused by the two being tightly connected, thereby reducing the processing and assembly difficulty of the filler 40 and the isolation portion 320.

[0046] In other embodiments, the filler 40 is a structural adhesive, which can be set during the glue injection process of the individual battery 20 in the battery pack, thereby further reducing the assembly difficulty of its individual assembly. In addition, the structural adhesive not only has a certain heat insulation effect, but also can effectively bond the individual battery 20 on both sides, thereby further improving the structural stability of the individual battery 20.

[0047] It should be noted that structural adhesive is used to bond and fix structural components within the battery pack. Structural adhesive has the characteristics of high strength, ability to withstand large loads, aging resistance, fatigue resistance, corrosion resistance, and stable performance within its expected lifespan, thereby improving the connection strength between the battery and the casing. The material of structural adhesive is an insulating material doped with a conductive medium. Specifically, insulating materials can be used as the base material, that is, non-conductive adhesives, such as epoxy resin, silicone rubber, polyurethane, etc. It can also be epoxy resin structural adhesive and polyurethane structural adhesive, or two-component epoxy resin structural adhesive, two-component acrylic structural adhesive, two-component polyurethane structural adhesive, or two-component silane structural adhesive.

[0048] Furthermore, in the battery pack provided in the embodiments of this disclosure, the overlapping area of ​​the connecting portion 310 on the first surface 210 is spaced apart from the etched area of ​​the explosion-proof valve 230 on the first surface 210, so as to avoid the connecting portion 310 obstructing the explosion-proof valve 230 and affecting the ejection of high-temperature gas in the explosion-proof valve 230 area, ensuring that the single battery 20 can quickly eject high-temperature gas during thermal runaway, reducing the risk of further blockage and explosion. Furthermore, in some embodiments of this disclosure, the connecting portion 310 completely overlaps the first surface 210, so that the connecting portion 310 has high utilization efficiency, achieving connection with the first surface 210 and support for the isolation portion 320, such as... Figure 5As shown, the distance d7mm between the connecting part 310 and the explosion-proof valve 230 ranges from 0.5mm to 4mm, specifically 0.5mm, 1mm, 1.6mm, 2.2mm, 2.8mm, 3.4mm, or 4mm. It should be noted that if the distance between the connecting part 310 and the explosion-proof valve 230 is less than 0.5mm, the setting of the connecting part 310 will have a certain impact on the surrounding area of ​​the explosion-proof valve 230, causing the connecting part 310 to obstruct the ejection path of the explosion-proof valve 230, affecting the depressurization rate of the single battery 20 during thermal runaway. If the distance between the connecting part 310 and the explosion-proof valve 230 is greater than 4mm, the overlapping area between the connecting part 310 and the first surface 210 is too small, resulting in insufficient supporting force of the connecting part 310 on the isolation part 320, posing a risk of deformation to the isolation part 320 and affecting its heat insulation capability. Therefore, in this embodiment, the distance d7mm between the connecting part 310 and the explosion-proof valve 230 is limited to 0.5mm-4mm, so that the connecting part 310 has sufficient overlapping area on the first surface 210 to satisfy the supporting function of the isolation part 320, while avoiding the impact on the exhaust of the explosion-proof valve 230.

[0049] Furthermore, in the battery pack provided in the embodiments of this disclosure, such as Figure 6 As shown, along the direction perpendicular to the first surface 210, i.e., the height direction of the single cell 20, the height h3mm of the connecting part 310 ranges from 1mm to 4mm, specifically 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or 4mm. It should be noted that if the height of the connecting part 310 is less than 1mm, the rigidity of the connecting part 310 will be poor, resulting in insufficient overlap and a risk of deformation. If the height of the connecting part 310 is greater than 4mm, the connecting part 310 will occupy a large height within the battery pack, affecting the assembly of other components such as the busbar. Therefore, the height h3mm of the connecting part 310 is limited to the range of 1mm-4mm to ensure that the connecting part 310 has sufficient overlap strength without affecting the installation of structures such as the busbar.

[0050] Furthermore, in some embodiments, the single cell 20 is specifically a cylindrical cell, and correspondingly, the range of h1 / h2 is further limited to 0.05-0.35, specifically 0.05, 0.15, 0.25 or 0.35. Specifically, in the cylindrical cell structure, due to the influence of the arc structure, the force on the edge of the first surface 210 of the connecting part 310 is more complex, which is prone to slippage risk. Therefore, compared with the aforementioned embodiments, this embodiment further reduces the height ratio of the insulating part 320 on the single cell 20, so as to reduce the load generated by the insulating part 320 on the connecting part 310 and reduce the load deformation risk of the connecting part 310, which has greater overlap difficulty.

[0051] Furthermore, in the battery pack provided in this embodiment, the isolation portion 320 is preferably disposed through a single battery pack 10, that is, the battery pack 10 can be divided into multiple relatively independent regions, and thermal isolation is achieved between each independent region. On this basis, for the cylindrical battery structure, the individual cells 20 are arranged in an alternating structure to make full use of the space inside the battery pack and improve the energy density of the battery pack. The isolation portion 320 is S-shaped along its length direction, extending in a curved manner and fitting against the side of the individual cells 20, thereby achieving thermal isolation for the individual cells 20 on both sides.

[0052] Furthermore, in some embodiments of this disclosure, the height h1mm of the isolation portion 320 ranges from 5mm to 30mm, specifically 5mm, 10mm, 15mm, 20mm, 25mm, or 30mm, so that the isolation portion 320 is not too small, resulting in insufficient heat insulation area, or too large, causing a large load on the connecting portion 310, thus posing a greater risk of deformation to the isolation component 30; while the height h2mm of the individual battery 20 ranges from 70mm to 220mm, specifically 70mm, 80mm, 100mm, 135mm, 180mm, or 220mm, so that the height of the individual battery 20 meets the energy density requirements of the battery pack, while not causing the battery pack to be too large and thus posing a greater assembly difficulty in the target flattening process.

[0053] 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.

[0054] 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: At least two battery packs (10) are spaced apart, and each battery pack (10) includes at least two individual cells (20). Each individual cell (20) includes a first surface (210) and a second surface (220) located at both ends in its height direction. The first surface (210) is provided with an explosion-proof valve (230). An isolation component (30) is at least partially disposed between two battery packs (10). The isolation component (30) includes a bent connecting portion (310) and an isolation portion (320). The connecting portion (310) is at least partially overlapped with the first surface (210). The isolation portion (320) is embedded in the gap between the two battery packs (10) and extends from the first surface (210) to the second surface (220). Along a direction perpendicular to the first surface (210), the height at which the isolation portion (320) overlaps with the casing of the single battery cell (20) is h1 mm, the height of the single battery cell (20) is h2 mm, and the range of h1 / h2 is 0.05-0.

4.

2. The battery pack as described in claim 1, characterized in that, The connecting part (310) is in the battery pack (10) on one side, the overlapping area on the first surface (210) of a single cell (20), the span along the width direction of the single cell (20) is d1mm, the width dimension of the first surface (210) is d2mm, and the range of d1 / d2 is 0.02-0.

2.

3. The battery pack as described in claim 1, characterized in that, The gap d3mm between two adjacent single cells (20) ranges from 1mm to 6mm.

4. The battery pack as described in claim 3, characterized in that, The isolation section (320) is an elastic structure and is compressed between two adjacent single cells (20). The thickness of the isolation section (320) before compression is d4mm, and the range of d3 / d4 is 0.25-0.

75.

5. The battery pack as described in claim 1, characterized in that, The connecting part (310) is bent and disposed on one side of the isolation part (320), and overlapped and fixed with the first surface (210) on one side.

6. The battery pack as described in claim 1, characterized in that, The connecting part (310) is bent and disposed on both sides of the isolation part (320), and overlaps and is fixed with the first surface (210) on both sides respectively.

7. The battery pack as described in claim 6, characterized in that, The overlap area between the connecting part (310) and the first surface (210) on one side is d5mm, and the overlap area between the connecting part (310) and the first surface (210) on the other side is d6mm. The range of d5 / d6 is 0.9-1.

1.

8. The battery pack as described in claim 7, characterized in that, The range of h1 / h2 is 0.1-0.

4.

9. The battery pack as described in claim 6, characterized in that, The connecting portion (310) is located in the area on both sides of the isolation portion (320) and is symmetrically arranged with respect to the isolation portion (320).

10. The battery pack as described in claim 5 or 6, characterized in that, The connecting part (310) and the isolating part (320) are arranged vertically.

11. The battery pack as claimed in claim 1, characterized in that, It also includes a filler (40) disposed between the two individual cells (20).

12. The battery pack as claimed in claim 11, characterized in that, Along the height direction of the single cell (20), the filler (40) extends from the second surface (220) toward the first surface (210) and is spaced apart from the isolation portion (320).

13. The battery pack as claimed in claim 11, characterized in that, The filler (40) is a structural adhesive.

14. The battery pack as claimed in claim 1, characterized in that, The connecting part (310) is spaced apart from the explosion-proof valve (230) in the overlapping area of ​​the first surface (210).

15. The battery pack as claimed in claim 14, characterized in that, The connecting part (310) is completely overlapped with the first surface (210), and the distance d7mm between the connecting part (310) and the explosion-proof valve (230) is in the range of 0.5mm-4mm.

16. The battery pack as claimed in claim 1, characterized in that, Along the direction perpendicular to the first surface (210), the height h3mm of the connecting part (310) ranges from 1mm to 4mm.

17. The battery pack as claimed in claim 2, characterized in that, The single cell (20) is a cylindrical cell, and the range of h1 / h2 is 0.05-0.

35.

18. The battery pack as claimed in claim 17, characterized in that, The individual cells (20) are arranged in an alternating pattern, and the isolation portion (320) has an S-shaped configuration along its length and is attached to the side of the individual cells (20).

19. The battery pack as claimed in claim 1, characterized in that, The range of h1mm is 5mm-30mm, and the range of h2mm is 70mm-220mm.

20. The battery pack as claimed in claim 2, characterized in that, The range of d1mm is 0.6mm-8mm; the range of d2mm is 30mm-80mm.

21. The battery pack as claimed in claim 4, characterized in that, The d4mm range is 1.4mm-8mm.

22. The battery pack as claimed in claim 7, characterized in that, The range of d5mm is 0.4mm-7mm, and the range of d6mm is 0.4mm-7mm.

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