Battery and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a power utilization device, and the battery comprises a box body, an outer cover plate, a battery cell group, an inner cover plate and a pressure relief piece. The battery cell groups are arranged in the accommodating cavity along the second direction, each battery cell group comprises a plurality of battery cells arranged along the first direction, and each battery cell is provided with an anti-explosion valve; the inner cover plate is arranged in the accommodating cavity and is connected with one surface, facing the battery cell group, of the outer cover plate, the inner cover plate comprises a plurality of first pressure relief parts extending along the first direction, and the first pressure relief parts are arranged in the accommodating cavity along the second direction; a first pressure relief channel is arranged between each first pressure relief part and the outer cover plate, and the anti-explosion valve of each battery cell is arranged on one surface, opposite to the first pressure relief part, of the battery cell; and a plurality of first pressure relief holes sealed by pressure relief pieces are formed in the positions, opposite to the anti-explosion valve, of the first pressure relief parts. Diffusion of high-pressure gas and eruptions in the battery can be reduced, and the risk of thermal runaway propagation is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to batteries and electrical devices. Background Technology

[0002] In battery design, the electrical connections, thermal management, and safety protection of the cells are crucial aspects. Among these, the design of the cell's explosion-proof valve plays a decisive role in battery safety, as it can rapidly release high-pressure gases inside the cell in the event of thermal runaway, thereby preventing the battery from exploding.

[0003] Currently, the short-blade battery cell, as a high-performance battery unit, is widely used in electric vehicles, energy storage systems, and other fields due to its high energy density and excellent safety. However, because the terminals of the short-blade battery cell are located on opposite sides and the explosion-proof valve is located at the top, high-pressure gas and ejected materials can easily diffuse inside the battery during thermal runaway, increasing the risk of thermal runaway propagation. Utility Model Content

[0004] This application provides a battery and an electrical device to address the problem that when a battery cell experiences thermal runaway, high-pressure gas and ejected materials can easily diffuse inside the battery, increasing the risk of thermal runaway propagation.

[0005] In a first aspect, this application provides a battery having three perpendicular directions: a first direction, a second direction, and a third direction, and including a housing, an outer cover, multiple cell groups, an inner cover, and multiple pressure relief components. The housing is provided with a receiving cavity. The outer cover is connected to the housing and is used to cover the receiving cavity. Each of the aforementioned cell groups is arranged in the receiving cavity along the second direction. Each cell group includes multiple cells arranged along the first direction, and each cell is provided with an explosion-proof valve. An inner cover plate is disposed in the receiving cavity and connected to the side of the outer cover plate facing the cell group. The inner cover plate includes multiple first pressure relief portions, each of which extends along the first direction and is arranged in the receiving cavity along the second direction. The battery is also provided with a first pressure relief channel, which is disposed between each of the first pressure relief portions and the outer cover plate. The explosion-proof valve of each cell is disposed on the side of the cell opposite to the first pressure relief portion. Each first pressure relief portion has multiple first pressure relief holes, each of which is located opposite to the explosion-proof valve. The battery also includes multiple pressure relief components, each of which is connected to the first pressure relief portion and covers the first pressure relief holes.

[0006] Beneficial effects: By setting a first pressure relief section and a corresponding first pressure relief hole extending along the cell assembly direction on the inner cover plate, combined with the outer cover plate to form a first pressure relief channel, the high-pressure gas emitted by the cell explosion-proof valve is directed to the outside, preventing the disorderly diffusion of gas and ejected materials within the battery box. The design of the pressure relief component cover sealing the pressure relief hole ensures sealing performance under normal operating conditions, and only ruptures to release pressure in the event of thermal runaway, achieving rapid pressure relief and isolation from thermal runaway, significantly reducing the risk of thermal diffusion.

[0007] In one optional embodiment, the inner cover plate further includes a body portion that fits against the outer cover plate and a plurality of first baffle portions. The plurality of first baffle portions are connected to the cell assembly at one end in the third direction and to the body portion at the other end in the third direction. Each first baffle portion extends along the first direction, and each cell assembly is provided with a first baffle portion at both ends in the second direction.

[0008] Beneficial effects: The first baffle section connects the battery cell assembly and the outer cover plate body along a third direction, forming a physical isolation barrier to prevent ejected material from directly impacting the outer cover plate or adjacent battery cell assembly. The extension direction of the baffle section is consistent with the battery cell arrangement direction, optimizing the airflow path and guiding the ejected material to be discharged in an orderly manner along the first pressure relief channel, reducing lateral diffusion.

[0009] In one optional embodiment, the inner cover plate further includes a plurality of second pressure relief portions and a plurality of second baffle portions. Each of the battery cells is provided with a second pressure relief portion and a second baffle portion at both ends in the second direction. Each of the second pressure relief portions and each of the second baffle portions extends along the first direction, and the first pressure relief portion, the second pressure relief portion, the second baffle portion and the first baffle portion are connected in sequence. The inner cover plate further includes a second pressure relief channel and a second pressure relief hole. The second pressure relief channel is disposed between the first pressure relief portion, the second pressure relief portion, the second baffle portion, the first baffle portion and the body portion. The second pressure relief hole is opened on the side of the second pressure relief portion facing the battery cell group.

[0010] Beneficial effects: The addition of a second pressure relief section and a second baffle section, together with the first pressure relief section and the main body, forms a second pressure relief channel, constructing a multi-stage pressure relief buffer system. The first pressure relief channel is responsible for the main pressure relief, while the second pressure relief channel diverts some gas through the second pressure relief hole, further reducing local pressure peaks.

[0011] In one optional embodiment, each of the second pressure relief portions is inclined, and the height of one end of each of the second pressure relief portions near the first pressure relief portion along the second direction is greater than the height of the other end of each of the second pressure relief portions away from the first pressure relief portion along the second direction.

[0012] Beneficial effects: The second pressure relief section adopts an inclined design (higher at the end closer to the first pressure relief section and lower at the end further away), which utilizes the characteristics of gravity and airflow dynamics to accelerate the ejected material to converge in a direction away from the first pressure relief section, thus avoiding stagnation in the second pressure relief channel.

[0013] In one optional embodiment, the inner cover plate further includes a third baffle portion and a fourth baffle portion. The third baffle portion and the fourth baffle portion are staggered along the third direction in each of the second pressure relief channels. Each of the third baffle portions and each of the fourth baffle portions extends along the first direction. The third baffle portion is connected to the first pressure relief portion, and the fourth baffle portion is connected to the second baffle portion.

[0014] Beneficial effects: The third and fourth baffle sections, arranged alternately along a third direction within the second pressure relief channel, form a labyrinthine airflow blocking structure, forcing the airflow to change direction multiple times and significantly weakening the kinetic energy of the ejected material. The staggered baffles extend the flow time of thermal runaway products, providing space for gas cooling and particulate matter settling, further reducing the propagation speed and hazard of thermal runaway. The staggered layout of the baffles extends the flow path of the ejected material, reducing particulate matter spillage through collision deceleration and deposition, and improving the redundancy of safety protection.

[0015] In one alternative embodiment, the battery further includes a first gap disposed between the pressure relief element and the explosion-proof valve.

[0016] Beneficial effects: The first gap design between the pressure relief component and the explosion-proof valve prevents the pressure relief component from contacting the explosion-proof valve due to vibration or thermal expansion under normal operating conditions, thus avoiding false triggering. At the same time, the first gap provides pre-diffusion space for the ejected gas in the early stage of thermal runaway, mitigating instantaneous pressure shock, extending the response time window of the pressure relief component, and ensuring the accuracy of the pressure relief action.

[0017] In one alternative embodiment, the battery further includes a second gap disposed between the body portion and the outer cover plate.

[0018] Beneficial effects: The second gap between the main body and the outer cover plate forms an auxiliary exhaust chamber, allowing a small amount of gas to be released slowly through the gap, balancing the internal and external pressure difference, and preventing the inner cover plate from deforming due to instantaneous high pressure; the gap can also serve as a redundant pressure relief path, providing emergency pressure relief when the first pressure relief channel is blocked, thus improving system reliability.

[0019] In one optional embodiment, the battery further includes a plurality of connectors, with each connector disposed between two adjacent cells arranged along the second direction. The connectors include a first connecting segment, a second connecting segment, and a third connecting segment. The second connecting segment and the third connecting segment are respectively disposed at both ends of the first connecting segment along the second direction. The second connecting segment is connected to one of the two adjacent cells arranged along the second direction, and the third connecting segment is connected to the other cell.

[0020] Beneficial effects: The connector connects adjacent cells in segments on both sides, accommodating assembly tolerances in the second direction of the cell assembly. The flexible structure and multi-point fixing design of the connector disperse mechanical stress, preventing loosening of the connection due to cell expansion or vibration, and ensuring long-term stability of the electrical connection. Simultaneously, the explosion-proof valve and cell terminals are located on opposite sides (thermoelectric separation), preventing ejected material from contaminating the electrical connection area and reducing the risk of short circuits.

[0021] In one optional embodiment, the battery further includes a plurality of support beams and an elastic element. Each of the support beam groups is arranged within the receiving cavity along the second direction, and a support beam is disposed between two adjacent cell assemblies. The support beams extend along the first direction, and a second connecting segment and a third connecting segment are respectively disposed on both sides of the support beams along the second direction. The elastic element is disposed between the second connecting segment and the support beam, and / or, between the third connecting segment and the support beam.

[0022] Beneficial effects: The support beam extends along the arrangement direction of each cell in the cell assembly and connects to the connectors via elastic elements, forming a flexible support system. The support beam provides lateral rigidity to prevent the cell assembly from shifting. The elastic elements absorb the deformation energy generated by the thermal expansion or vibration of the cells, avoiding stress concentration that could lead to connector breakage, while also compensating for manufacturing tolerances and ensuring tight contact between the cells.

[0023] In one optional embodiment, the first pressure relief channel extends along the first direction, and the pressure relief component and the explosion-proof valve are provided one-to-one.

[0024] Beneficial effects: In the event of thermal runaway of a battery cell, the molten material ejected from the explosion-proof valve can burn through the pressure relief component opposite the battery cell, enter the first pressure relief channel, and then flow and cool along the first direction under the guidance of the first pressure relief channel. The pressure relief components corresponding to the explosion-proof valves of adjacent battery cells are not damaged, and the molten material can be contained within the first pressure relief channel, preventing the molten material from directly contacting adjacent battery cells in the first direction, while also preventing thermal runaway from spreading to adjacent battery cell groups along the second direction.

[0025] Secondly, this application also provides an electrical device, including a battery.

[0026] Since the electrical device includes a battery and has the same effect as a battery, it will not be elaborated further here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the inner cover plate in an embodiment of this application;

[0030] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0031] Figure 4 This is a schematic diagram of the structure of the box in an embodiment of this application;

[0032] Figure 5 for Figure 4 A magnified view of part B in the diagram;

[0033] Figure 6 This is a cross-sectional view of a battery according to an embodiment of this application;

[0034] Figure 7 for Figure 6 A magnified view of part of C;

[0035] Figure 8 for Figure 6 A magnified view of part of D;

[0036] Figure 9 for Figure 6 A magnified view of part of E in the diagram.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Housing; 2. Receiving cavity; 3. Outer cover plate; 4. Battery cell assembly; 5. Inner cover plate; 501. Main body; 502. First baffle section; 503. Second pressure relief section; 504. Second baffle section; 505. Third baffle section; 506. Fourth baffle section; 6. First pressure relief section; 7. First pressure relief channel; 8. Explosion-proof valve; 9. First pressure relief hole; 10. Pressure relief component; 11. Second pressure relief channel; 12. Second pressure relief hole; 13. First gap; 14. Second gap; 15. Connecting component; 1501. First connecting section; 1502. Second connecting section; 1503. Third connecting section; 16. Support beam; 17. Elastic component; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The following is combined Figures 1 to 8 This describes an embodiment of the present application.

[0041] According to an embodiment of this application, a battery is provided, having a first direction X, a second direction Y, and a third direction Z perpendicular to each other, including a housing 1, an outer cover plate 3, multiple cell groups 4, an inner cover plate 5, and multiple pressure relief components 10. The housing 1 is provided with a receiving cavity 2. The outer cover plate 3 is connected to the housing 1 and is used to seal the receiving cavity 2. Each cell group 4 is arranged in the receiving cavity 2 along the second direction Y, and each cell group 4 includes multiple cells arranged along the first direction X, and each cell is provided with an explosion-proof valve 8. The inner cover plate 5 is disposed in the receiving cavity 2 and connected to the side of the outer cover plate 3 facing the cell group 4. The inner cover plate 5 includes multiple first pressure relief parts 6, each of which extends along the first direction X and is arranged along the second direction Y in the receiving cavity 2. The battery also includes a first pressure relief channel 7, which is located between each first pressure relief section 6 and the outer cover plate 3. The explosion-proof valve 8 of each cell is located on the side of the cell opposite to the first pressure relief section 6. Each first pressure relief section 6 has several first pressure relief holes 9, each located opposite the explosion-proof valve 8. The battery also includes multiple pressure relief components 10, each connected to the first pressure relief section 6 and sealing the first pressure relief holes 9.

[0042] It should be noted that the introduction of the first direction X, the second direction Y, and the third direction Z in the various embodiments of this application is merely for the convenience of describing spatial positional relationships and should not be construed as limiting the scope of the embodiments of this application. Therefore, the pairwise perpendicular relationship of the first direction X, the second direction Y, and the third direction Z can be interpreted, depending on the actual technical scenario, as the first direction X, the second direction Y, and the third direction Z respectively representing three mutually perpendicular directions in three-dimensional space, or it can be reasonably interpreted as a nearly perpendicular relationship between the first direction X, the second direction Y, and the third direction Z, for example, the included angles between the first direction X, the second direction Y, and the third direction Z are all within the range of 85°-95°... As long as the technical solution can conform to the spirit of this application or achieve the technical effect described in this application, it can be considered to fall within the scope defined by the appended claims.

[0043] like Figure 1 As shown, the strength of the pressure relief component 10 is much smaller than the sidewall strength of the first pressure relief part 6, allowing the pressure relief component 10 to break when high-pressure gas is ejected from the explosion-proof valve 8, enabling the high-pressure gas to smoothly enter the first pressure relief channel 7. The first pressure relief channel 7 is suitable for guiding the high-pressure gas. The first direction X, the second direction Y, and the third direction Z can be arranged perpendicularly to each other. The first direction X and the second direction Y are the length and width directions of the battery, respectively, and the third direction Z is the thickness direction of the battery. At the same time, multiple cells of each cell group 4 are arranged along the first direction X, so that multiple explosion-proof valves 8 of each cell group 4 are also arranged along the first direction X, in the same direction as the extension of the first pressure relief part 6. Multiple first pressure relief holes 9 on the same first pressure relief part 6 are also arranged along the first direction X, and the multiple first pressure relief holes 9 can be respectively set to correspond one-to-one with the multiple explosion-proof valves 8.

[0044] Understandable, such as Figure 2 The inner cover plate 5 shown (compared to) Figure 1 , Figure 2 The inner cover 5 is shown as the inner structure visible after flipping it over. The outer cover 3 and the inner cover 5 can be constructed as an integrated cover structure. After multiple battery cell groups 4 are arranged in sequence in the receiving cavity 2 and positioned and connected, the cover structure can be directly snapped together to achieve sealing of the box 1 and make each first pressure relief hole 9 aligned with each explosion-proof valve 8, thus realizing the construction of the battery.

[0045] In this embodiment, by providing a first pressure relief part 6 extending along the arrangement direction of the cell group 4 on the inner cover plate 5, and forming a first pressure relief channel 7 with the outer cover plate 3, the high-pressure gas ejected by the cell explosion-proof valve 8 is directed to the outside, preventing the gas and ejected materials from spreading disorderly inside the battery box. The design of the pressure relief component 10 sealing the pressure relief hole ensures sealing under normal operating conditions, and only ruptures to release pressure in the event of thermal runaway, achieving rapid pressure relief and isolation from thermal runaway, significantly reducing the risk of thermal diffusion.

[0046] In one embodiment, the inner cover plate 5 further includes a body portion 501 that fits the outer cover plate 3 and a plurality of first baffle portions 502. One end of the plurality of first baffle portions 502 in the third direction Z is connected to the cell assembly 4, and the other end of the plurality of first baffle portions 502 in the third direction Z is connected to the body portion 501. Each first baffle portion 502 extends along the first direction X, and each cell assembly 4 is provided with a first baffle portion 502 at both ends in the second direction Y.

[0047] It should be noted that, as Figure 9 As shown, the first baffle portion 502 abuts against the top surface of the battery cell assembly 4, so that the first baffle portion 502 located at both ends of the battery cell assembly 4 in the second direction Y can seal the explosion-proof valve 8 of the battery cell assembly 4, forming a sealed cavity, which causes the high-pressure gas ejected by the explosion-proof valve 8 to flow along a preset path, that is, enter the first pressure relief channel 7 and the second pressure relief channel 11.

[0048] Optionally, the main body 501, the first baffle 502, the second baffle 504, the third baffle 505, the fourth baffle 506, the first pressure relief part 6, and the second pressure relief part 503 are an integral structure, which together form the inner cover plate 5.

[0049] In this embodiment, the first baffle portion 502 connects the battery cell assembly 4 and the outer cover plate 3 body along the third direction Z, forming a physical isolation barrier to prevent the ejected material from directly impacting the outer cover plate 3 or adjacent battery cell assembly 4. The extension direction of the baffle portion is consistent with the battery cell arrangement direction, optimizing the airflow path and guiding the ejected material to be discharged in an orderly manner along the first pressure relief channel 7, reducing lateral diffusion.

[0050] In one embodiment, the inner cover plate 5 further includes a plurality of second pressure relief portions 503 and a plurality of second baffle portions 504. Each cell assembly 4 is provided with a second pressure relief portion 503 and a second baffle portion 504 at both ends in the second direction Y. Each second pressure relief portion 503 and each second baffle portion 504 extends along the first direction X, and the first pressure relief portion 6, the second pressure relief portion 503, the second baffle portion 504 and the first baffle portion 502 are connected in sequence. The inner cover plate 5 further includes a second pressure relief channel 11 and a second pressure relief hole 12. The second pressure relief channel 11 is disposed between the first pressure relief portion 6, the second pressure relief portion 503, the second baffle portion 504, the first baffle portion 502 and the body portion 501. The second pressure relief hole 12 is opened on the side of the second pressure relief portion 503 facing the cell assembly 4.

[0051] It should be noted that, as Figure 9 As shown, the second baffle portion 504 can abut against the top surface of the battery cell assembly 4, which can increase the contact area with the battery cell assembly 4 and improve the sealing performance.

[0052] Understandable, such as Figure 8 As shown, the first pressure relief channel 7 and the second pressure relief channel 11 are isolated by the first pressure relief part 6, so that the first pressure relief channel 7 and the second pressure relief channel 11 form two independent channels.

[0053] In this embodiment, a second pressure relief section 503 and a second baffle section 504 are added, which together with the first pressure relief section 6 and the main body section 501 form a second pressure relief channel 11, constructing a multi-stage pressure relief buffer system. The first pressure relief channel 7 is responsible for the main pressure relief, and the second pressure relief channel 11 diverts part of the gas through the second pressure relief hole 12, further reducing the local pressure peak.

[0054] In one embodiment, each of the second pressure relief portions 503 is inclined, and the height of the end of each second pressure relief portion 503 near the first pressure relief portion 6 along the second direction Y is greater than the height of the other end of each second pressure relief portion 503 away from the first pressure relief portion 6 along the second direction Y.

[0055] Understandable, such as Figure 9 As shown, the second pressure relief part 503 is inclined and its lower end is connected to the second baffle part 504, which allows the top of the second baffle part 504 to form a retention channel. The ejected material entering from the second pressure relief hole 12 can be deposited in the retention channel to prevent it from flowing back to the surface of the battery cell.

[0056] In this embodiment, the second pressure relief section 503 adopts an inclined design (higher at the end near the first pressure relief section 6 and lower at the end away from it). By utilizing the characteristics of gravity and airflow dynamics, it accelerates the ejected material to converge in the direction away from the first pressure relief section 6, thus avoiding stagnation in the second pressure relief channel 11.

[0057] In one embodiment, the inner cover plate 5 further includes a third baffle portion 505 and a fourth baffle portion 506. Each second pressure relief channel 11 is provided with a third baffle portion 505 and a fourth baffle portion 506 interleaved along a third direction Z. Each third baffle portion 505 and each fourth baffle portion 506 extends along a first direction X. The third baffle portion 505 is connected to the first pressure relief portion 6, and the fourth baffle portion 506 is connected to the second baffle portion 504.

[0058] It should be noted that, as Figure 9 As shown, the third baffle portion 505 and the fourth baffle portion 506 can divide the second pressure relief channel 11 into multiple sequentially connected channels along the third direction Z, thereby extending the flow length of the second pressure relief channel 11.

[0059] Optionally, multiple third baffle portions 505 and multiple fourth baffle portions 506 can be provided, with multiple third baffle portions 505 being spaced apart and multiple fourth baffle portions 506 being spaced apart.

[0060] In this embodiment, the third baffle portion 505 and the fourth baffle portion 506 are staggered along the third direction Z within the second pressure relief channel 11, forming a labyrinthine airflow blocking structure. This forces the airflow to change direction multiple times, significantly weakening the kinetic energy of the ejected material. The staggered baffles prolong the flow time of the thermal runaway products, providing space for gas cooling and particulate matter settling, further reducing the propagation speed and hazard of thermal runaway. The staggered layout of the baffles prolongs the flow path of the ejected material, reducing particulate matter spillage through collision deceleration and deposition, and improving the redundancy of safety protection.

[0061] In one embodiment, such as Figure 8 As shown, the battery also includes a first gap 13, which is disposed between the pressure relief component 10 and the explosion-proof valve 8.

[0062] In this embodiment, the first gap 13 between the pressure relief component 10 and the explosion-proof valve 8 is designed to prevent the pressure relief component 10 from contacting the explosion-proof valve 8 due to vibration or thermal expansion under normal operating conditions, thus avoiding false triggering. At the same time, the first gap 13 provides pre-diffusion space for the ejected gas in the early stage of thermal runaway, alleviates the instantaneous pressure impact, extends the response time window of the pressure relief component 10, and ensures the accuracy of the pressure relief action.

[0063] In one embodiment, such as Figure 8 As shown, the battery also includes a second gap 14, which is disposed between the main body 501 and the outer cover plate 3.

[0064] In this embodiment, the second gap 14 between the main body 501 and the outer cover plate 3 forms an auxiliary exhaust chamber, allowing a small amount of gas to be released slowly through the gap, balancing the internal and external pressure difference, and preventing the inner cover plate 5 from deforming due to instantaneous high pressure; the gap can also serve as a redundant pressure relief path, providing emergency pressure relief when the first pressure relief channel is blocked, thereby improving system reliability.

[0065] In one embodiment, such as Figure 7 As shown, the battery also includes multiple connectors 15. A connector 15 is provided between two adjacent cells arranged along the second direction Y. The connector 15 includes a first connecting segment 1501, a second connecting segment 1502, and a third connecting segment 1503. The second connecting segment 1502 and the third connecting segment 1503 are respectively provided at both ends of the first connecting segment 1501 along the second direction Y. The second connecting segment 1502 is connected to one of the two adjacent cells arranged along the second direction Y, and the third connecting segment 1503 is connected to the other cell.

[0066] Understandably, the connector 15 is provided with a bent sheet-like structure, which can be elastic, so that the second connecting segment 1502 and the third connecting segment 1503 can be connected to the terminal of the battery cell under the influence of their own elasticity.

[0067] In this embodiment, the connector 15 connects adjacent battery cells in segments on both sides, adapting to the assembly tolerance of the battery cell assembly 4 in the second direction Y. The structural flexibility and multi-point fixing design of the connector disperse mechanical stress, preventing loosening of the connection due to battery cell expansion or vibration, and ensuring the long-term stability of the electrical connection. At the same time, the explosion-proof valve 8 and the battery cell terminal are located on opposite sides (thermoelectric separation), preventing ejected material from contaminating the electrical connection area and reducing the risk of short circuits.

[0068] In one embodiment, the battery further includes a plurality of support beams 16 and elastic members 17. Each set of support beams 16 is arranged along a second direction Y within the receiving cavity 2, and a support beam 16 is disposed between two adjacent sets of four cells. The support beams 16 extend along a first direction X, and a second connecting section 1502 and a third connecting section 1503 are respectively disposed on both sides of the support beam 16 along the second direction Y. The elastic member 17 is disposed between the second connecting section 1502 and the support beam 16, and / or, between the third connecting section 1503 and the support beam 16.

[0069] Optionally, the elastic element 17 can be configured as a spring.

[0070] Optionally, the support beam 16 and the box body 1 are constructed as an integral structure.

[0071] In this embodiment, the support beam 16 extends along the arrangement direction of each cell in the cell assembly 4 and is connected to the connector 15 via the elastic member 17 to form a flexible support system. The support beam 16 provides lateral rigid constraint to prevent the cell assembly 4 from shifting. The elastic member 17 absorbs the deformation energy generated by the thermal expansion or vibration of the cells, avoiding stress concentration that could cause the connector 15 to break, while also compensating for manufacturing tolerances and ensuring tight contact between the cells.

[0072] In one embodiment, the first pressure relief channel 7 extends along the first direction X, and the pressure relief component 10 and the explosion-proof valve 8 are provided one-to-one.

[0073] Beneficial effects: In the event of thermal runaway of a battery cell, the molten material ejected from the explosion-proof valve 8 can burn through the pressure relief component 10 opposite to that battery cell, enter the first pressure relief channel 7, and then flow and cool along the first direction X under the guidance of the first pressure relief channel 7. The pressure relief components 10 corresponding to the explosion-proof valves 8 of adjacent battery cells are not damaged, and the molten material can be contained within the first pressure relief channel 7, preventing the molten material from directly contacting adjacent battery cells in the first direction X, and at the same time preventing thermal runaway from spreading along the second direction Y to adjacent battery cell groups 4.

[0074] According to an embodiment of this application, another aspect provides an electrical device including a battery.

[0075] Since the electrical device includes a battery and has the same effect as a battery, it will not be elaborated further here.

[0076] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery having a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other, characterized in that, include: The box body (1) is provided with a receiving cavity (2); The outer cover plate (3) is connected to the box body (1) and is used to cover the receiving cavity (2); Multiple battery cell groups (4) are arranged in the receiving cavity (2) along the second direction (Y). Each battery cell group (4) includes multiple battery cells arranged along the first direction (X). Each battery cell is provided with an explosion-proof valve (8). The inner cover plate (5) is disposed in the receiving cavity (2) and connected to the side of the outer cover plate (3) facing the battery cell assembly (4). The inner cover plate (5) includes a plurality of first pressure relief parts (6), each of the first pressure relief parts (6) extends along the first direction (X) and each of the first pressure relief parts (6) is arranged in the receiving cavity (2) along the second direction (Y). The battery is also provided with a first pressure relief channel (7), which is located between each of the first pressure relief parts (6) and the outer cover plate (3). The explosion-proof valve (8) of each of the battery cells is located on the side of the battery cell opposite to the first pressure relief part (6). Each of the first pressure relief parts (6) is provided with a plurality of first pressure relief holes (9), and each of the first pressure relief holes (9) is located at a position opposite to the explosion-proof valve (8); It also includes multiple pressure relief components (10), each of which is connected to the first pressure relief part (6) and covers the first pressure relief hole (9).

2. The battery according to claim 1, characterized in that, The inner cover plate (5) further includes a body part (501) that fits the outer cover plate (3) and a plurality of first baffle parts (502). One end of the plurality of first baffle parts (502) in the third direction (Z) is connected to the battery cell assembly (4), and the other end of the plurality of first baffle parts (502) in the third direction (Z) is connected to the body part (501). Each first baffle part (502) extends along the first direction (X), and each battery cell assembly (4) is provided with a first baffle part (502) at both ends in the second direction (Y).

3. The battery according to claim 2, characterized in that, The inner cover plate (5) further includes a plurality of second pressure relief parts (503) and a plurality of second baffle parts (504). Each of the battery cell groups (4) is provided with a second pressure relief part (503) and a second baffle part (504) at both ends in the second direction (Y). Each second pressure relief part (503) and each second baffle part (504) extends along the first direction (X), and the first pressure relief part (6), the second pressure relief part (503), the second baffle part (504) and the first baffle part (502) are connected in sequence. The inner cover plate (5) further includes a second pressure relief channel (11) and a second pressure relief hole (12). The second pressure relief channel (11) is disposed between the first pressure relief part (6), the second pressure relief part (503), the second baffle part (504), the first baffle part (502) and the main body part (501). The second pressure relief hole (12) is opened on the side of the second pressure relief part (503) facing the battery cell assembly (4).

4. The battery according to claim 3, characterized in that, Each of the second pressure relief portions (503) is inclined, and the height of the end of each of the second pressure relief portions (503) near the first pressure relief portion (6) along the second direction (Y) is greater than the height of the other end of each of the second pressure relief portions (503) away from the first pressure relief portion (6) along the second direction (Y).

5. The battery according to claim 3, characterized in that, The inner cover plate (5) further includes a third baffle portion (505) and a fourth baffle portion (506). The third baffle portion (505) and the fourth baffle portion (506) are staggered along the third direction (Z) in each of the second pressure relief channels (11). Each third baffle portion (505) and each fourth baffle portion (506) extends along the first direction (X). The third baffle portion (505) is connected to the first pressure relief portion (6), and the fourth baffle portion (506) is connected to the second baffle portion (504).

6. The battery according to claim 1, characterized in that, It also includes a first gap (13), which is disposed between the pressure relief component (10) and the explosion-proof valve (8).

7. The battery according to claim 2, characterized in that, It also includes a second gap (14), which is disposed between the main body (501) and the outer cover plate (3).

8. The battery according to claim 1, characterized in that, Also includes: Multiple connectors (15) are provided between two adjacent battery cells arranged along the second direction (Y). Each connector (15) includes a first connecting segment (1501), a second connecting segment (1502), and a third connecting segment (1503). The second connecting segment (1502) and the third connecting segment (1503) are respectively provided at both ends of the first connecting segment (1501) along the second direction (Y). The second connecting segment (1502) is connected to one of the two adjacent battery cells arranged along the second direction (Y), and the third connecting segment (1503) is connected to the other battery cell.

9. The battery according to claim 8, characterized in that, Also includes: Multiple support beams (16) are arranged in the receiving cavity (2) along the second direction (Y), and the support beams (16) are provided between two adjacent battery cell groups (4). The support beams (16) extend along the first direction (X), and the second connecting section (1502) and the third connecting section (1503) are respectively provided on both sides of the support beams (16) along the second direction (Y). An elastic element (17) is disposed between the second connecting section (1502) and the support beam (16), and / or, is disposed between the third connecting section (1503) and the support beam (16).

10. The battery according to claim 1, characterized in that, The first pressure relief channel (7) extends along the first direction (X), and the pressure relief component (10) and the explosion-proof valve (8) are provided one-to-one.

11. An electrical appliance, characterized in that, include: The battery according to any one of claims 1 to 10.

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