Power storage device and power consuming device

Abstract

The application provides a power storage device, which comprises a shell, an electrical device board assembly and a battery module. The shell is internally formed with a receiving cavity, and a ventilation opening is arranged on a first side wall of the shell, and the ventilation opening is communicated with the receiving cavity and an external space. The electrical device board assembly is arranged in the receiving cavity. The battery module is located in the receiving cavity and connected with the electrical device board assembly. The battery module comprises a plurality of soft package battery cells stacked along a first direction, and the plurality of soft package battery cells comprise a first battery cell closest to the first side wall. The first battery cell comprises a first film shell and a first electrode lead, the first film shell has a first sealing edge portion, one end of the first electrode lead is located in the first film shell, and the other end of the first electrode lead extends to the electrical device board assembly through the first sealing edge portion. In an orthogonal projection along the first direction, the first sealing edge portion at least partially overlaps with the ventilation opening, and the first electrode lead at least partially overlaps with the ventilation opening.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an energy storage device and an electrical appliance. Background Technology

[0002] With the rapid development of new energy vehicles and start-stop battery systems, pouch batteries have been widely used due to their advantages such as high energy density, flexible size, and significant cost advantages. However, pouch batteries pose safety hazards under extreme operating conditions or in the event of thermal runaway.

[0003] Pouch cells are encapsulated in an aluminum-plastic film. When thermal runaway occurs inside, a large amount of high-temperature gas is generated inside the cell, causing a sharp increase in internal pressure. If the exhaust system of the energy storage device is not properly designed, the high-temperature gas cannot be discharged in time, which will cause the energy storage device to expand or even explode.

[0004] In related technologies, the exhaust structure of pouch battery energy storage devices suffers from limited exhaust capacity. Summary of the Invention

[0005] In view of this, embodiments of this application provide an energy storage device and an electrical device, aiming to solve the problem of limited exhaust capacity in the exhaust structure of pouch battery energy storage devices in the related art.

[0006] In a first aspect, embodiments of this application provide an energy storage device, which includes a housing, an electronic component board assembly, and a battery module. A receiving cavity is formed inside the housing, and a vent is provided on a first sidewall of the housing, the vent connecting the receiving cavity and an external space. The electronic component board assembly is disposed within the receiving cavity. The battery module is located within the receiving cavity and connected to the electronic component board assembly. The battery module includes a plurality of pouch cells stacked along a first direction, among which a first cell is closest to the first sidewall. The first cell includes a first membrane shell and a first electrode lead. The first membrane shell has a first sealing edge, one end of the first electrode lead is located inside the first membrane shell, and the other end of the first electrode lead extends through the first sealing edge to connect with the electronic component board assembly. In a projection along the first direction, the first sealing edge and the vent at least partially overlap, and the first electrode lead and the vent at least partially overlap.

[0007] In conjunction with the first aspect described above, in some optional embodiments, a first rib and a second rib are provided on the first sidewall, with the first rib and the second rib located on both sides of the ventilation opening, respectively. The first rib and the second rib extend along a second direction, and the first sealing portion extends along a third direction, which is perpendicular to the first direction. The second direction and the second direction have an included angle θ1, where θ1 satisfies: 70°≤θ1≤110°.

[0008] In conjunction with the first aspect above, in some optional embodiments, the second direction is perpendicular to the third direction. Along the third direction, the minimum distance L1 between the first rib and the second rib satisfies: 8 mm ≤ L1 ≤ 30 mm. Along the second direction, the height of both the first rib and the second rib is W1, and W1 satisfies: 8 mm ≤ W1 ≤ 20 mm. And / or, along the second direction, the minimum distance L2 between the line connecting the tops of the first rib and the second rib and the upper edge of the ventilation port satisfies: 2 mm ≤ L2 ≤ 15 mm.

[0009] In conjunction with the first aspect described above, in some optional embodiments, the first sidewall is provided with a first receiving groove, the first receiving groove being located on the side of the first rib away from the second rib, preferably, along the first direction, the depth D1 of the first receiving groove satisfies: 1 mm ≤ D1 ≤ 5 mm; and / or, the first sidewall is provided with a second receiving groove, the second receiving groove being located on the side of the second rib away from the first rib, preferably, along the first direction, the depth D2 of the first receiving groove satisfies: 1 mm ≤ D2 ≤ 5 mm; and / or, a third receiving groove is provided between the first rib and the second rib, preferably, along the first direction, the depth D3 of the first receiving groove satisfies: 1 mm ≤ D3 ≤ 5 mm.

[0010] In conjunction with the first aspect described above, in some optional embodiments, the battery module includes a first battery module and a second battery module arranged along a third direction. In the orthographic projection along the first direction, the first battery module at least partially overlaps with the vent, the first receiving slot, and the third receiving slot, and the second receiving slot at least partially overlaps with the second battery module. The number of pouch cells in the first battery module is less than the number of pouch cells in the second battery module.

[0011] In conjunction with the first aspect described above, in some optional embodiments, a partition is provided between the first battery cell and the first sidewall, and in the orthographic projection on a plane perpendicular to the first direction, the partition at least partially overlaps with the ventilation port. Along the second direction, the minimum distance from the upper edge of the partition to the lower edge of the ventilation port is L3. Preferably, L3 satisfies: L3 ≤ 3 mm. The flexural modulus of the partition is not less than 750 MPa. The first direction is perpendicular to the second direction.

[0012] In conjunction with the first aspect described above, in some alternative embodiments, the electrical component board assembly includes a circuit board and a lead bracket. The circuit board is located on the side of the lead bracket away from the battery module, and the circuit board, lead bracket, and battery module are connected in sequence. The lead bracket has a first baffle extending toward the side of the battery module, and in a projected orthographic projection along a first direction, the first baffle at least partially overlaps with a vent.

[0013] In conjunction with the first aspect above, in some optional embodiments, along the first direction, the distance between the first baffle and the first battery cell is less than the distance between the first rib and the first battery cell, and / or, the distance between the first baffle and the first battery cell is less than the distance between the second rib and the first battery cell; and / or, along the first direction, the first baffle is provided with a protrusion facing the battery module.

[0014] In conjunction with the first aspect above, in some alternative embodiments, along the second direction, the first baffle and the first rib and / or the second rib have a minimum gap D4, where D4 satisfies: 0.5 mm ≤ D4 ≤ 3 mm; and / or, along the first direction, the first baffle and the first sidewall have a minimum gap D5, where D5 satisfies: 2 mm ≤ D5 ≤ 10 mm.

[0015] Secondly, embodiments of this application provide an electrical device that includes the energy storage device described in any of the above embodiments.

[0016] According to the technical solution provided in the embodiments of this application, the vent of the energy storage device at least partially overlaps with the first sealing edge and the first electrode lead of the pouch cell. That is, the vent is located on the first side wall of the housing, opposite to the first sealing edge and the first electrode lead of the pouch cell. Because the strength of the first sealing edge at the first electrode lead is relatively large, the gas generated by the side reaction inside the pouch cell is not easily able to break through the first sealing edge around the first electrode lead, so that the gas breaking area on the first sealing edge can avoid the vent, thereby effectively preventing the first membrane shell from blocking the vent.

[0017] Furthermore, the fixed connection between the first electrode lead and the device board assembly can further enhance the strength of the first sealing edge near the connection area of ​​the first electrode lead, preventing the first membrane shell in this area from being ruptured by gas. Moreover, even if this area is ruptured, the first electrode lead fixedly connected to the device board assembly can still pull and limit the first membrane shell of the first sealing edge connected to it, thereby preventing the first membrane shell of the pouch cell from being blown by the side reaction gas generation, which would cover the ventilation port and affect the exhaust, thus improving the safety of the energy storage device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the drawings only show some embodiments of this application and should not be considered as a limitation of the scope. It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements. Furthermore, it should be understood that the drawings are merely schematic, and the dimensions and scale of the elements in the drawings are not necessarily precise.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an energy storage device according to an embodiment of this application.

[0020] Figure 2 This is a three-dimensional structural diagram of a portion of the energy storage device according to an embodiment of this application.

[0021] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure along the cross section of AA.

[0022] Figure 4 for Figure 3 A frontal view of the structure.

[0023] Figure 5 for Figure 4 A magnified schematic diagram of the structure of region E in the middle.

[0024] Figure 6 This is a three-dimensional structural diagram of the housing of an energy storage device according to an embodiment of this application.

[0025] Figure 7 for Figure 6 A schematic diagram of the cross-section along BB.

[0026] Figure 8 for Figure 6 A schematic diagram of the cross-section along CC.

[0027] Figure 9 This is a three-dimensional structural diagram of another part of the structure of an energy storage device according to an embodiment of this application.

[0028] Figure 10 for Figure 9 A top-view structural diagram.

[0029] Figure label: 100. Energy storage devices; 10. Housing; 11. Receiving cavity; 12. First sidewall; 121. First receiving groove; 122. Second receiving groove; 123. Third receiving groove; 13. Ventilation port; 14. First rib; 15. Second rib; 20. Electrical component board assembly; 21. Circuit board; 22. Lead wire bracket; 221. First baffle; 30. Battery module; 31. First battery module; 32. Second battery module; 33. Soft-pack battery cell; 331. First membrane shell; 3311. First sealing edge; 332. First electrode lead; 40. Separator; 50. Cover. Detailed Implementation

[0030] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0031] Pouch batteries pose safety hazards under extreme conditions or in the event of thermal runaway. Pouch cells are encapsulated in an aluminum-plastic film; when internal side reactions occur, a large amount of high-temperature, high-pressure gas is generated inside the cell, causing a rapid increase in internal pressure. If the energy storage device's venting system is improperly designed, the high-temperature gas cannot be discharged in time, potentially leading to the energy storage device expanding or even exploding.

[0032] In related technologies, the exhaust structure of energy storage devices usually adopts the method of opening a vent on the shell. However, the inventor found through research that there are some technical defects.

[0033] First, the vent is usually located on the side wall or bottom of the housing of the energy storage device, far away from the tab area, resulting in a long exhaust path and high resistance.

[0034] Secondly, the high-temperature airflow generated during thermal runaway will blow away the softened aluminum-plastic membrane, causing it to deform and move towards the ventilation port, which may cover or block the ventilation port, leading to depressurization failure.

[0035] Furthermore, the exhaust structure in the relevant technology lacks an effective mechanism for guiding and collecting ejected particulate matter, which may move with the airflow and cause secondary short circuits or blockages.

[0036] Therefore, a new technical solution is needed to address the technical problem of limited exhaust capacity of the vent during thermal runaway and improve the safety performance of energy storage devices.

[0037] To address the aforementioned problems in related technologies, this application provides an energy storage device and an electrical appliance. The following is in conjunction with… Figures 1 to 5 The present application provides an embodiment of an energy storage device and an electrical appliance.

[0038] It should be understood that there are many ways to implement this application, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of this application.

[0039] For ease of description, the first direction is indicated by arrow X in the diagram, the third direction by arrow Y, and the second direction by arrow Z, and they are perpendicular to each other. In this text, along the Z direction, the direction pointed to by the arrow is the top (upper) part, and the direction away from the direction pointed to by the arrow is the bottom (lower) part.

[0040] It should also be noted that, in orthographic projection along a certain direction, it specifically means that the plane in which the orthographic projection is located is perpendicular to that direction. For example, in orthographic projection along a first direction, it means that the plane in which the orthographic projection is located is perpendicular to the first direction.

[0041] Exemplary energy storage device refer to Figures 1 to 10 In a first aspect, embodiments of this application provide an energy storage device 100, which includes a housing 10, an electronic component board assembly, and a battery module 30. A receiving cavity 11 is formed inside the housing 10 (e.g., the lower housing 10), and a vent 13 is provided on a first sidewall 12 of the housing 10, communicating with the receiving cavity 11 and an external space. The electronic component board assembly 30 is disposed within the receiving cavity 11. The battery module 30 is located within the receiving cavity 11 and connected to the electronic component board assembly 30. The battery module 30 includes a plurality of pouch cells 33 stacked along a first direction X, and the plurality of pouch cells 33 includes a first cell closest to the first sidewall 12. The first battery cell includes a first housing 331 and a first electrode lead 332. The first housing 331 has a first sealing portion 3311 (e.g., a top sealing portion). One end of the first electrode lead 332 is located inside the first housing 331, and the other end of the first electrode lead 332 (e.g., it may be a tab) extends through the first sealing portion 3311 to connect with the device board assembly 30. In a projection along the first direction X, the first sealing portion 3311 at least partially overlaps with the vent 13, and the first electrode lead 332 at least partially overlaps with the vent 13.

[0042] According to the technical solution provided in the embodiments of this application, the vent 13 of the energy storage device 100 at least partially overlaps with the first sealing edge portion and the first electrode lead of the first battery cell. That is, the vent 13 is opened on the first side wall of the housing, opposite to the first sealing edge portion 3311 and the first electrode lead 332 of the pouch battery cell. Because the strength of the first sealing edge portion 3311 at the first electrode lead 332 is relatively large, the gas generated by the side reaction inside the pouch battery cell 33 is not easy to break through the first sealing edge portion 3311 around the first electrode lead 332, so that the gas breaking area on the first sealing edge portion 3311 can avoid the vent 13, thereby effectively preventing the first membrane shell 331 from blocking the vent 13.

[0043] Furthermore, the fixed connection between the first electrode lead 332 and the device board assembly 20 can further enhance the strength of the first sealing portion 3311 near the connection area of ​​the first electrode lead 332, preventing the first membrane shell 331 in this area from being ruptured by gas. Moreover, even if this area is ruptured, the first electrode lead 332, which is fixedly connected to the device board assembly 20, can still pull and limit the first membrane shell 331 of the first sealing portion 3311 connected to it, thereby preventing the first membrane shell 331 of the soft-pack battery cell from being blown by the side reaction gas generation, which would cover the ventilation port 13 and affect the exhaust, thereby improving the safety of the energy storage device 100.

[0044] It should be noted that the first sealing edge 3311 can be a top sealing edge, and the first electrode lead can be a positive lead or a negative lead.

[0045] For example, the first membrane shell 331 can be an aluminum-plastic film.

[0046] For example, each pouch cell 33 is provided with at least two electrode leads of opposite polarity, such as a negative lead and a positive lead.

[0047] For example, the electrical component board assembly may include a BMS board, a PCB board, and a lead frame, etc.

[0048] refer to Figure 1 For example, the energy storage device 100 also includes a cover 50 that covers the lower housing 10.

[0049] It is understood that those skilled in the art can configure one or more battery modules 30 according to the needs of specific application scenarios.

[0050] It should be noted that the first direction X can be either the length direction of the housing 10 or the width direction of the housing 10, and those skilled in the art can choose to set it as needed.

[0051] refer to Figures 6 to 8 In some embodiments, a first rib 14 and a second rib 15 are provided on the first sidewall 12. The first rib 14 and the second rib 15 are located on both sides of the ventilation port 13 to support the first membrane shell 331 and prevent the first membrane shell 331 from covering the ventilation port 13 in the event of thermal runaway, thereby improving safety. The first rib 14 and the second rib 15 extend along the second direction Z, and the first sealing portion 3311 extends along the third direction Y. The third direction Y is perpendicular to the first direction X, and the second direction Z and the third direction Y have an included angle θ1, where θ1 satisfies: 70°≤θ1≤110°, for example, 70°, 80°, 90°, 100° or 110°, or any value between them.

[0052] In this way, the arrangement of the first rib 14 and the second rib 15 helps to reduce the resistance to gas flow, allowing the gas to reach the ventilation port 13 more smoothly. At the same time, the first rib 14 and the second rib 15 can guide some of the particulate matter in the gas to settle downwards under the action of gravity, and to a certain extent prevent particulate matter on both sides of the gas from entering the ventilation port 13, thus avoiding excessive particles entering the ventilation port 13 and causing blockage.

[0053] It is understandable that the first rib 14 and / or the second rib 15 can be configured as trapezoidal, wavy, or straight. (See reference) Figures 4 to 8 In one example, the first rib 14 and / or the second rib 15 are set as straight strips, and the structure is relatively simple.

[0054] In some embodiments, the second direction Z is perpendicular to the third direction Y, i.e., θ1 = 90°, and the second direction Z is vertically downward, which is more conducive to reducing the resistance to gas flow and allowing the gas to reach the ventilation port 13 more smoothly. At the same time, the first rib 14 and the second rib 15 can better guide the particulate matter in the gas to fall under the action of gravity, avoiding blockage of the ventilation port 13. Along the third direction Y, the minimum spacing L1 of the first rib 14 and the second rib 15 satisfies: 8 mm ≤ L1 ≤ 30 mm, for example, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 25 mm or 30 mm, or any value between them, to avoid L1 being too small, which is not conducive to gas flow and guiding the fall of particulate matter, or L2 being too large, which cannot effectively support the first membrane shell 331, causing the first membrane shell 331 to cover the ventilation port 13. Along the second direction Z, the height of the first rib 14 and the second rib 15 is W1, and W1 satisfies: 8mm≤W1≤20mm, for example, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm or 20 mm, or any value between them, to avoid W1 being too small, which would not effectively support the first membrane shell 331 and cause the first membrane shell 331 to cover the ventilation port 13, or W1 being too large, which would interfere with other structures.

[0055] refer to Figure 7 In some embodiments, along the second direction Z, the minimum distance L2 between the line connecting the top of the first rib 14 and the second rib 15 and the upper edge of the vent 13 satisfies: 2 mm ≤ L2 ≤ 15 mm, for example, 2 mm, 3 mm, 4 mm, 5 mm, 8 mm, 10 mm, 12 mm or 15 mm, or any value between them.

[0056] The minimum distance L2 between the line connecting the top of the first rib 14 and the second rib 15 and the upper edge of the air exchange port 13 is controlled within a certain range to avoid the distance being too small, which would not effectively prevent the membrane shell from covering the air exchange port 13, or the distance being too large, which would increase the exhaust path.

[0057] Continue to refer to Figure 7 In some embodiments, the second direction Z is perpendicular to the third direction Y. Along the third direction Y, the distance L1 between the first rib 14 and the second rib 15 satisfies: 8 mm ≤ L1 ≤ 30 mm. Along the second direction Z, the heights of the first rib 14 and the second rib 15 are W1, respectively, and W1 satisfies: 8 mm ≤ W1 ≤ 20 mm. Along the second direction Z, the distance L2 between the line connecting the tops of the first rib 14 and the second rib 15 and the upper edge of the ventilation port 13 satisfies: 2 mm ≤ L2 ≤ 15 mm.

[0058] refer to Figures 6 to 8 In some embodiments, the first sidewall 12 is provided with a first receiving groove 121, which is located on the side of the first rib 14 away from the second rib 15. Thus, the first receiving groove 121 can accommodate particulate matter in the collected gas while buffering the gas. Preferably, along the first direction X, the depth D1 of the first receiving groove 121 satisfies: 1 mm ≤ D1 ≤ 4 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, or any value between them. This avoids D1 being too small, which would not provide sufficient space for collecting particulate matter in the gas and buffering the gas, or D1 being too large, which would weaken the strength of the housing 10.

[0059] Next, refer to Figures 6 to 8 In some embodiments, the first sidewall 12 is provided with a second receiving groove 122, which is located on the side of the second rib 15 away from the first rib 14. Thus, the first receiving groove 121 can accommodate particulate matter in the collected gas while buffering the gas. Preferably, along the first direction X, the depth D2 of the first receiving groove 121 satisfies: 1 mm ≤ D2 ≤ 4 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, or any value between them. This avoids D2 being too small, which would not provide sufficient space for collecting particulate matter in the gas and buffering the gas, or D2 being too large, which would weaken the strength of the housing 10.

[0060] Continue to refer to Figures 6 to 8 In some embodiments, a third receiving groove 123 is provided between the first rib 14 and the second rib 15. Preferably, along the first direction X, the depth D3 of the first receiving groove 121 satisfies: 1 mm ≤ D3 ≤ 5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, or any value between them, to avoid D3 being too small, which would not provide a suitable space to collect particulate matter and buffer gas in the gas, or D3 being too large, which would weaken the strength of the shell 10.

[0061] refer to Figure 9 and Figure 10In some embodiments, the battery module 30 includes a first battery module 31 and a second battery module 32 arranged along a third direction Y. In the orthographic projection along the first direction X, the first battery module 31 at least partially overlaps with the vent 13, the first receiving groove 121 and the third receiving groove 123, and the second receiving groove 122 at least partially overlaps with the second battery module 32.

[0062] In one example, the first battery module 31 partially overlaps with the first receiving slot 121, the vent 13, the third receiving slot 123, and a portion of the second receiving slot 122, with the second receiving slot 122 partially overlapping with the second battery module 32.

[0063] In this way, the three receiving slots can each provide suitable space to collect particulate matter and buffer gas from the gas released from the corresponding location. Furthermore, the first battery module 31 is directly opposite the vent 13. The number of first battery modules 31 is set to be relatively small, and they overlap with the third receiving slot 123, the first receiving slot 121, and part of the second receiving slot 122 simultaneously. This maximizes the collection of particulate matter from the air released by the first battery module 31 and buffers the released air, improving the safety of the energy storage device 100. The second battery module 31 is relatively far from the vent 13, allowing it to overlap with part of the second receiving slot 122. This buffers the gas released by the second battery module to a certain extent and collects and blocks particulate matter before the gas reaches the vent 13, further preventing blockage of the vent 13.

[0064] Return to reference Figures 3 to 5 In some embodiments, a partition 40, such as an insulating plate, is provided between the first battery cell and the first sidewall 12 to provide insulation, thermal isolation, and shock absorption. In orthographic projection onto a plane perpendicular to the first direction X, the partition 40 at least partially overlaps with the vent 13 to further constrain the membrane shell of the pouch battery cell 33 and prevent it from covering the vent 13. Along the second direction Z, the minimum distance from the upper edge of the partition 40 to the lower edge of the vent 13 is L3. Preferably, L3 satisfies: L3 ≤ 3 mm, for example, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, etc., to avoid excessively large L3 that could excessively obstruct the vent 13 and hinder exhaust. The flexural modulus of the partition 40 is not less than 750 MPa to provide sufficient resistance to bending deformation, thereby effectively constraining the membrane shell and preventing it from deforming and covering the vent 13. The first direction X is perpendicular to the second direction Z.

[0065] It should be noted that the distance L3 between the upper edge of the partition 40 and the lower edge of the air exchange port 13 refers to the distance between the lowest point of the lower edge of the air exchange port 13 and the partition 40.

[0066] Next, refer to Figures 3 to 5In some embodiments, the electrical component board assembly 30 includes a circuit board 21 and a lead bracket 22. The circuit board 21 is located on the side of the lead bracket 22 away from the battery module 30, and the circuit board 21, the lead bracket 22, and the battery module 30 are connected in sequence. The lead bracket 22 has a first baffle 221 extending toward the side of the battery module 30. In a projection along the first direction X, the first baffle 221 at least partially overlaps with the vent 13 to further prevent the first membrane shell 331 and the first electrode lead 332 from deforming and covering the vent 13, further facilitating venting and thereby further improving the safety of the energy storage device 100.

[0067] In some embodiments, along the first direction X, the distance between the first baffle 221 and the first battery cell is less than the distance between the first rib 14 and the first battery cell, so as to cooperate with the first rib 14 to block the first membrane shell 331 from covering the ventilation port 13.

[0068] In some embodiments, the distance between the first baffle 221 and the first battery cell is less than the distance between the second rib 15 and the first battery cell, so as to cooperate with the second rib 15 to prevent the first membrane shell 331 from covering the ventilation port 13.

[0069] In some embodiments, along the first direction X, the first baffle 221 is provided with a protrusion (e.g., a rib, not shown in the figure) facing the battery module 30 to further support the first membrane shell 331 and prevent the first membrane shell 331 from covering the ventilation port 13.

[0070] In some embodiments, along the first direction X, the distance between the first baffle 221 and the first battery cell is less than the distance between the first rib 14 and the first battery cell, and the distance between the first baffle 221 and the first battery cell is less than the distance between the second rib 15 and the first battery cell. Along the first direction X, the first baffle 221 is provided with a protrusion facing the battery module 30.

[0071] In some embodiments, along the second direction Z, the first baffle 221 has a minimum gap D4 with the first rib 14 and / or the second rib 15, D4 satisfying: 0.5 mm ≤ D4 ≤ 3 mm, for example, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm or any value between them.

[0072] It should be noted that the minimum gap D4 between the first baffle 221 and the first rib 14 or the second rib 15 refers to the distance between the bottom end of the first baffle 221 and the top end of the first rib 14 or the second rib 15 along the second direction Z.

[0073] In this way, the first membrane shell 331 can be supported to avoid blocking the air exchange port 13, while avoiding the situation where the spacing is too small, which is not conducive to gas flow, or the spacing is too large, which cannot effectively support and block the first membrane shell 331.

[0074] In some embodiments, along the first direction X, the first baffle 221 and the first sidewall 12 have a minimum gap D5, where D5 satisfies: 4 mm ≤ D5 ≤ 6 mm, for example, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm, or any value between them. This gap increases the gas buffer space, reducing the peak pressure of the shock wave. Simultaneously, it avoids D5 being too small, failing to form an effective buffer space, or D5 being too large, failing to effectively shield the first membrane shell 331, or interfering with other structures.

[0075] It should be noted that the minimum gap D5 between the first baffle 221 and the first sidewall 12 refers to the distance between the rear side surface of the first baffle 221 and the inner wall surface of the first sidewall 12 along the first direction X.

[0076] In this application, the energy storage device 100 can be a power energy storage device 100, a low-voltage energy storage device 100, or a start-stop energy storage device 100, etc.

[0077] It should be noted that other aspects of the construction of the energy storage device 100 can refer to the conventional construction of energy storage devices 100 in the field. For the sake of brevity, this application will not elaborate on them further.

[0078] Exemplary electrical equipment Embodiments of this application also provide an electrical device including the aforementioned energy storage device 100. The electrical device has the corresponding effects of the aforementioned battery, which will not be described in detail here.

[0079] It should be noted that the electrical equipment mentioned in this application can be energy storage equipment, such as energy storage cabinets, or power consumption equipment, such as automobiles, drones, power tools, workstations, and motorcycles.

[0080] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0081] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0082] It should be understood that the term "comprising" and its variations as used in this application are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0083] It should be understood that although terms such as “first” or “second” may be used in this application to describe various elements (such as a first direction and a second direction), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0084] It should be noted that, in the description of this application, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0085] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0086] The scope of protection of this application is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage device, characterized in that, include: The housing has an internal cavity, and a vent is provided on the first side wall of the housing, the vent connecting the cavity and the external space; An electrical component board assembly is disposed within the accommodating cavity; A battery module is located within the accommodating cavity and connected to the electrical component board assembly. The battery module includes a plurality of pouch cells stacked along a first direction. Among the plurality of pouch cells, there is a first cell closest to the first sidewall. The first cell includes a first membrane shell and a first electrode lead. The first membrane shell has a first sealing edge. One end of the first electrode lead is located inside the first membrane shell, and the other end of the first electrode lead extends through the first sealing edge to connect with the electrical component board assembly. In the orthographic projection along the first direction, the first sealing edge portion at least partially overlaps with the air vent, and the first electrode lead at least partially overlaps with the air vent.

2. The energy storage device according to claim 1, characterized in that, The first sidewall is provided with a first rib and a second rib, which are located on both sides of the ventilation port. The first rib and the second rib extend along a second direction, and the first sealing part extends along a third direction. The third direction is perpendicular to the first direction, and the second direction and the third direction have an included angle θ1, where θ1 satisfies: 70°≤θ1≤110°.

3. The energy storage device according to claim 2, characterized in that, The second direction is perpendicular to the third direction. Along the third direction, the minimum spacing L1 between the first and second ribs satisfies: 8 mm ≤ L1 ≤ 30 mm. Along the second direction, the height of both the first and second ribs is W1, and W1 satisfies: 8 mm ≤ W1 ≤ 20 mm; and / or Along the second direction, the minimum distance L2 between the line connecting the tops of the first rib and the second rib and the upper edge of the air vent satisfies: 2 mm ≤ L2 ≤ 15 mm.

4. The energy storage device according to claim 2, characterized in that, The first sidewall is provided with a first receiving groove, which is located on the side of the first rib away from the second rib. Preferably, along the first direction, the depth D1 of the first receiving groove satisfies: 1 mm ≤ D1 ≤ 5 mm; and / or The first sidewall is provided with a second receiving groove, which is located on the side of the second rib away from the first rib. Preferably, along the first direction, the depth D2 of the first receiving groove satisfies: 1 mm ≤ D2 ≤ 5 mm; and / or A third receiving groove is provided between the first rib and the second rib. Preferably, along the first direction, the depth D3 of the first receiving groove satisfies: 1 mm ≤ D3 ≤ 5 mm.

5. The energy storage device according to claim 4, characterized in that, The battery module includes a first battery module and a second battery module arranged along a third direction. In the orthographic projection along the first direction, the first battery module at least partially overlaps with the air vent, the first receiving slot, the second receiving slot and the third receiving slot, and the second receiving slot at least partially overlaps with the second battery module. as well as The number of pouch cells in the first battery module is lower than the number of pouch cells in the second battery module.

6. The energy storage device according to any one of claims 1 to 5, characterized in that, A partition is provided between the first battery cell and the first sidewall. In the orthographic projection on a plane perpendicular to the first direction, the partition at least partially overlaps with the ventilation port. Along the second direction, the minimum distance from the upper edge of the partition to the lower edge of the air vent is L3; preferably, L3 satisfies: L3≤3 mm; The flexural modulus of the partition is not less than 750 MPa; The first direction is perpendicular to the second direction.

7. The energy storage device according to any one of claims 1 to 5, characterized in that, The electrical component board assembly includes a circuit board and a lead frame. The circuit board is located on the side of the lead frame away from the battery module, and the circuit board, the lead frame, and the battery module are connected in sequence. The lead bracket has a first baffle extending toward one side of the battery module, and in orthographic projection along the first direction, the first baffle at least partially overlaps with the vent.

8. The energy storage device according to claim 7, characterized in that, Along the first direction, the distance between the first baffle and the first cell is less than the distance between the first rib and the first cell, and / or The distance between the first baffle and the first battery cell is less than the distance between the second rib and the first battery cell; and / or Along the first direction, the first baffle is provided with a protrusion facing the battery module.

9. The energy storage device according to claim 7, characterized in that, Along the second direction, the first baffle has a minimum gap D4 with the first rib and / or the second rib, where D4 satisfies: 0.5 mm ≤ D4 ≤ 3 mm; and / or Along the first direction, the first baffle and the first sidewall have a minimum gap D5, where D5 satisfies: 2 mm ≤ D5 ≤ 10 mm.

10. An electrical appliance, characterized in that, Includes the energy storage device according to any one of claims 1 to 9.

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