Battery pack

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery pack which comprises a box body assembly, a supporting assembly, a bottom plate, a first battery cell and a second battery cell, the box body assembly is provided with a first opening; the supporting assembly covers the first opening, and a sealed space is defined by the supporting assembly and the box body assembly; the bottom plate is connected to the box body assembly and located on the side, away from the sealed space, of the supporting assembly. The bottom plate and the supporting assembly are arranged in a spaced mode to form a pressure relief space. The first battery cell and the second battery cell are arranged in the sealed space at an interval and are connected with the supporting assembly; the supporting assembly is provided with a first protruding part, and the first protruding part divides the pressure relief space into a first pressure relief sub-area and a second pressure relief sub-area. The pressure relief space is divided into the two independent pressure relief sub-areas by arranging the supporting assembly, so that the eruption matter does not string into the areas to influence the second battery cell when the first battery cell sprays the valve, and the reliability and the safety of the whole operation of the battery pack are improved.

Description

Technical Field

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

[0002] In the design of power battery packs, the internal space of the battery pack is usually divided into a space for placing battery cells and a single pressure relief space. In the event of thermal runaway, the battery cells will release high-temperature substances into the pressure relief space through their pressure relief mechanism.

[0003] Currently, multi-zone battery solutions have been proposed, which divide the battery pack into different zones. When one zone malfunctions, another zone can still function normally, thus preventing the entire pack from suddenly losing power and causing a potential accident. However, when cells in multiple zones share a single pressure relief space, overheated gas can still diffuse within that space and affect other cells, posing a risk of thermal runaway and spreading to adjacent zones, potentially leading to a chain reaction of thermal runaway in cells within those zones. Summary of the Invention

[0004] The technical problem this application aims to solve is: how to reduce the impact on the battery cells during thermal runaway of the battery pack.

[0005] To address the aforementioned technical problems, this application provides a battery pack having a first orientation, comprising: The housing assembly has a first opening on one side along the first direction; A support component is provided to cover the first opening and together with the housing component, forms a sealed space; A base plate is connected to the housing assembly and located on the side of the support assembly opposite to the sealed space; the base plate and the support assembly are spaced apart to form a pressure relief space; The first battery cell and the second battery cell are spaced apart within the sealed space and are both connected to the support assembly; The support component has a first protrusion that protrudes away from the first battery cell along the first direction and is connected to the base plate to divide the pressure relief space into a first pressure relief sub-region and a second pressure relief sub-region that are isolated from each other. Along the first direction, the first pressure relief sub-region corresponds to the first battery cell, and the second pressure relief sub-region corresponds to the second battery cell. The first pressure relief sub-region is configured to collect thermal runaway ejections from the first battery cell, and the second pressure relief sub-region is configured to collect thermal runaway ejections from the second battery cell.

[0006] In some embodiments, the support component includes: A first support portion is connected to the housing assembly, and the first support portion and the housing assembly enclose the sealed space. The first battery cell and the second battery cell are both connected to the first support portion. The first support portion is provided with a first pressure relief hole that extends through the first direction. The second support is connected to the side of the first support away from the sealed space along the first direction. The second support and the bottom plate together enclose the pressure relief space. The first protrusion is provided on the second support. The second support is provided with a second pressure relief hole that extends through the first direction. Along the first direction, the first pressure relief hole corresponds to the second pressure relief hole, and the first pressure relief hole and the second pressure relief hole are configured to allow the ejected material to enter and pass through.

[0007] In some embodiments, the first battery cell includes a first pressure relief member; the first pressure relief member is disposed at one end of the first battery cell facing the first support portion, and along the first direction, the orthographic projection of the first pressure relief member on the first support portion is at least partially located in the first pressure relief hole; The battery pack also includes: A protective component is disposed on the side of the first battery cell facing the first support portion, and the orthographic projection of the first pressure relief component along the first direction is located on the protective component; The protective element is configured to be broken when the first cell ejection valve is activated, allowing the ejected material to pass through.

[0008] In some embodiments, the protective element has a damage area; Along the first direction, the thickness of the damaged area is less than the thickness of other areas of the protective member, and the orthographic projection of the damaged area at least partially overlaps with the first pressure relief member and the first pressure relief hole; or, The damaged area has scratches.

[0009] In some embodiments, the first protrusion is sealed to the base plate. In some embodiments, the second support portion has a first flat portion disposed adjacent to the first protrusion; the first protrusion includes a first sidewall and a first bottom wall, the first flat portion is connected to the first support portion, and the first sidewall connects the first flat portion and the first bottom wall; It also includes a seal, which is at least partially connected between the first bottom wall and the bottom plate along the first direction.

[0010] In some embodiments, the first bottom wall includes a second flat portion and a second protrusion disposed adjacent to each other, the second protrusion connecting the second flat portion and the first side wall, and the second flat portion being spaced apart from the bottom plate along the first direction; The sealing element is disposed between the second flat portion and the base plate, and the sealing element is at least partially located between the second protrusion and the base plate.

[0011] In some embodiments, the base plate has a third flat portion and a protruding portion disposed adjacent to each other, and the protruding portion protrudes toward the direction of the third flat portion toward the first battery cell; along the first direction, the protruding portion is aligned with and spaced apart from the second flat portion, and the third flat portion is aligned with and spaced apart from the second protruding portion; The sealing element is disposed between the protrusion and the second flat portion, and the sealing element is at least partially disposed between the second protrusion and the third flat portion.

[0012] In some embodiments, the base plate has a first recess, which protrudes in a direction away from the first cell along the first direction, and the first protrusion is partially received in the first recess. The seal is located at least partially between the first recess and the first bottom wall.

[0013] In some embodiments, the second support portion further has a second recessed portion, which protrudes in a direction away from the first cell along the first direction. The second recessed portion is spaced apart from the first protrusion, and the second recessed portion and the first support portion form an outlet channel.

[0014] In some embodiments, the first support portion and the second support portion are integrally formed.

[0015] In some embodiments, the housing assembly includes: Top cover; The frame has a first opening and a second opening that are connected on opposite sides along the first direction. The upper cover is connected to the frame and closes the second opening. The upper cover, the frame, and the support assembly together enclose the sealed space. The frame includes a first side beam and a second side beam, and the support component connects the first side beam and the second side beam simultaneously; the first side beam is hollow to form a first cavity, the second side beam is hollow to form a second cavity, and the first cavity and the second cavity are spaced apart. Wherein, the first cavity is in communication with the first pressure relief sub-region and is configured to allow the ejected material from the first pressure relief sub-region to enter; and / or, The second cavity is in communication with the second pressure relief sub-region and is configured to allow the ejected material from the second pressure relief sub-region to enter.

[0016] The advantages of the battery pack provided in this application compared with the prior art are as follows: This application divides the battery pack into a sealed space for placing battery cells and a pressure relief space using a support component. The pressure relief space is further divided into a first pressure relief sub-region and a second pressure relief sub-region by a first protrusion. This ensures that the first battery cell corresponds to the first pressure relief sub-region and the second battery cell corresponds to the second pressure relief sub-region. When the first battery cell is depressurized, ejected material enters the first pressure relief sub-region. Due to the isolation effect of the first protrusion, the ejected material is prevented from entering the second pressure relief sub-region, thus preventing the ejected material from affecting the second battery cell. Similarly, when the second battery cell is depressurized, ejected material enters the second pressure relief sub-region without affecting the first battery cell. This application divides the battery cells and isolates them within the pressure relief space, effectively reducing the number of battery cells affected by heat propagation in the event of thermal runaway, thereby improving the overall reliability and safety of the battery pack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery pack described in this application.

[0018] Figure 2 This application Figure 1 A sectional view of section AA in the middle.

[0019] Figure 3 This application Figure 1 Isometric view of section AA.

[0020] Figure 4 This application Figure 3 Enlarged diagram of point B in the middle.

[0021] Figure 5 This application Figure 3 Enlarged diagram of point C in the middle.

[0022] Figure 6 This application Figure 3 Enlarged diagram of point D in the middle.

[0023] Figure 7 This application Figure 3 Enlarged diagram of point E in the middle.

[0024] Figure 8 This is a schematic diagram of the structure of the first or second battery cell in this application.

[0025] Figure 9 This is a schematic diagram of the structure of the border described in this application.

[0026] Figure 10 This is an assembly diagram of the support component and the base plate described in Embodiment 1 of this application.

[0027] Figure 11 This application Figure 10 Enlarged schematic diagram at point F in the middle.

[0028] Figure 12 This is an assembly diagram of the support component and the base plate described in Embodiment 2 of this application.

[0029] Figure 13 This application Figure 12 Enlarged schematic diagram of point G in the middle.

[0030] Figure 14 This is an assembly diagram of the support component and the base plate described in Embodiment 3 of this application.

[0031] Figure 15 This application Figure 14 Enlarged schematic diagram of point H in the middle.

[0032] Figure 16 This is an assembly diagram of the support component and the base plate described in Embodiment 4 of this application.

[0033] Figure 17 This application Figure 16 Enlarged schematic diagram of point I in the middle.

[0034] Figure label: 10. Housing assembly; 101. First opening; 102. Sealed space; 103. Pressure relief space; 103a. First pressure relief sub-area; 103b. Second pressure relief sub-area; 104. Second opening; 11. Top cover; 12. Frame; 121a. First side beam; 121b. Second side beam; 1211. First inner wall; 1211a. Support part; 1211b. Through hole; 1212. First outer wall; 1212a. Third pressure relief hole; 122a. First cavity; 122b. Second cavity; 20. Base plate; 21. Third flat section; 22. Protrusion; 23. First recess; 30. Support assembly; 301. First protrusion; 3011. First sidewall; 3012. First bottom wall; 3012a. Second flattened portion; 3012b. Second protrusion; 302. First flattened portion; 303. Second recessed portion; 304. Flow channel; 31. First support portion; 311. First pressure relief hole; 32. Second support portion; 321. Second pressure relief hole; 40a, First battery cell; 40b, Second battery cell; 41, First pressure relief component; 42, Second pressure relief component; 50. Protective components; 51. Damaged area; 60. Sealing components; 70. Balancing mechanism; 80. Isolation components; P1, first cell pressure relief path; P2, second cell pressure relief path; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0035] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to 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.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] Example 1 like Figure 1 As shown, this embodiment proposes a battery pack having three perpendicular directions: a first direction X, a second direction Y, and a third direction Z. For ease of explanation, the height direction of the battery pack is defined as the first direction X, the length direction as the second direction Y, and the width direction as the third direction Z.

[0042] In some implementations, such as Figure 1 , Figure 2 and Figure 3 As shown, the battery pack includes a housing assembly 10, a base plate 20, a support assembly 30, a first battery cell 40a, and a second battery cell 40b. The housing assembly 10 has a first opening 101 along a first direction X. The support assembly 30 covers the first opening 101 and, together with the housing assembly 10, forms a sealed space 102. The first battery cell 40a and the second battery cell 40b are spaced apart within the sealed space 102 along a second direction Y, and both are connected to the support assembly 30. The base plate 20 is connected to the housing assembly 10 and is located on the side of the support assembly 30 away from the sealed space 102. The base plate 20 and the support assembly 30 are spaced apart to form a pressure relief space 103. Along the first direction X, the sealed space 102 and the pressure relief space 103 are adjacent, facilitating the passage of battery cells ejected within the sealed space 102 through the support assembly 30 to reach the pressure relief space 103.

[0043] In some embodiments, to avoid cross-contamination of ejected material from the first cell 40a or the second cell 40b during thermal runaway, the support assembly 30 has a first protrusion 301, please refer to... Figure 2 Along the first direction X, the first protrusion 301 protrudes away from the first battery cell 40a and connects to the base plate 20 to divide the pressure relief space 103 into a first pressure relief sub-region 103a and a second pressure relief sub-region 103b. Along the first direction X, the first pressure relief sub-region 103a corresponds to the first battery cell 40a, and the second pressure relief sub-region 103b corresponds to the second battery cell 40b. The first pressure relief sub-region 103a and the second pressure relief sub-region 103b are isolated from each other. The first pressure relief sub-region 103a is configured to collect thermal runaway ejections from the first battery cell 40a, and the second pressure relief sub-region 103b is configured to collect thermal runaway ejections from the second battery cell 40b. Thus, the pressure relief space 103 is divided into a first pressure relief sub-region 103a and a second pressure relief sub-region 103b by the first protrusion 301, so that the first cell 40a corresponds to the first pressure relief sub-region 103a and the second cell 40b corresponds to the second pressure relief sub-region 103b. When the first cell 40a is depressurized, the ejected material enters the first pressure relief sub-region 103a. Due to the isolation effect of the first protrusion 301, the ejected material can be prevented from entering the second pressure relief sub-region 103b, thereby preventing the ejected material from affecting the second cell 40b. Similarly, when the second cell 40b is depressurized, the ejected material enters the second pressure relief sub-region 103b and will not affect the first cell 40a. Therefore, when the battery pack experiences thermal runaway, the number of cells affected by heat propagation can be effectively reduced, and the overall reliability and safety of the battery pack can be improved.

[0044] The first pressure relief sub-region 103a and the second pressure relief sub-region 103b are isolated from each other, meaning that inside the battery pack, the first pressure relief sub-region 103a and the second pressure relief sub-region 103b are always spatially non-connected; therefore, the first protrusion 301 and the base plate 20 need to be sealed together.

[0045] It should be noted that there are one or more first battery cells 40a. When there are multiple first battery cells 40a, the multiple first battery cells 40a are stacked along the third direction Z, and the multiple first battery cells 40a all correspond to the first voltage relief sub-region 103a in the first direction X, that is, the multiple first battery cells 40a share the first voltage relief sub-region 103a. Similarly, there are one or more second battery cells 40b. When there are multiple second battery cells 40b, the multiple second battery cells 40b are stacked along the third direction Z, and the multiple second battery cells 40b in the first direction X... All X correspond to the second pressure relief sub-region 103b, meaning that multiple second cells 40b share the second pressure relief sub-region 103b. With the first protrusion 301 isolating the first pressure relief sub-region 103a and the second pressure relief sub-region 103b, the first cell 40a and the second cell 40b do not interfere with each other during thermal runaway. Even if one of the multiple first cells 40a experiences thermal runaway, causing other first cells 40a to malfunction, the second cell 40b can still be guaranteed to supply power normally, avoiding the problem of the entire battery pack stopping power supply.

[0046] In the above description, the term "multiple" is used to indicate a quantity of 2 or more, such as 2, 3, 4... 10, 20 or even more.

[0047] In some implementations, such as Figure 4 and Figure 8 As shown, the first battery cell 40a includes a first pressure relief component 41, which is disposed at the end of the first battery cell 40a facing the support assembly 30. Along the first direction X, the orthographic projection of the first pressure relief component 41 is located in the first pressure relief sub-region 103a, so that when the first battery cell 40a experiences thermal runaway, the ejected material can break through the first pressure relief component 41 and enter the first pressure relief sub-region 103a. The structure of the second battery cell 40b is the same as that of the first battery cell 40a. Specifically, as shown... Figure 5 and Figure 8 As shown, the second battery cell 40b includes a second pressure relief member 42, which is disposed at one end of the second battery cell 40b facing the support assembly 30. Along the first direction X, the orthographic projection of the second pressure relief member 42 is located in the second pressure relief sub-region 103b, so that when the second battery cell 40b is in thermal runaway, the ejected material can break through the second pressure relief member 42 and enter the second pressure relief sub-region 103b.

[0048] In some implementations, such as Figure 4As shown, the support assembly 30 includes a first support portion 31 and a second support portion 32. Specifically, the first support portion 31 is connected to the housing assembly 10, and the first support portion 31 and the housing assembly 10 enclose a sealed space 102. The first battery cell 40a and the second battery cell 40b are both connected to the first support portion 31. The second support portion 32 is connected to the side of the first support portion 31 away from the sealed space 102 along the first direction X. The second support portion 32 and the bottom plate 20 together enclose a pressure relief space 103. A first protrusion 301 is provided on the second support portion 32 to divide the pressure relief space 103 into a first pressure relief sub-region 103a and a second pressure relief sub-region 103b. The support assembly 30 adopts a double-layer design, which can improve its support strength, thereby providing effective support for the first battery cell 40a and the second battery cell 40b.

[0049] Furthermore, to improve the efficiency of allowing ejected material from the battery cell to enter the pressure relief space 103 through the support assembly 30 during the valve operation, the first support portion 31 is provided with a first pressure relief hole 311 extending along the first direction X; the second support portion 32 is provided with a second pressure relief hole 321 extending along the first direction X; and along the first direction X, the first pressure relief hole 311 and the second pressure relief hole 321 correspond, and the first pressure relief hole 311 and the second pressure relief hole 321 are configured to allow ejected material to enter and pass through. Specifically, the first support portion 31 has two adjacent first pressure relief holes 311 along the second direction Y, such as... Figure 4 As shown, along the first direction X, one of the first pressure relief holes 311 corresponds to the first pressure relief component 41, that is, the orthogonal projection of the first pressure relief component 41 on the first support portion 31 is at least partially located in the first pressure relief hole 311, so that when the first battery cell 40a is ejected, the ejected material can break through the first pressure relief component 41 and enter the first pressure relief sub-region 103a through the first pressure relief hole 311 and the second pressure relief hole 321, thereby improving the throughput of the ejected material from the first battery cell 40a; as Figure 5 As shown, along the first direction X, another first pressure relief hole 311 corresponds to the second pressure relief member 42. That is, the orthogonal projection of the second pressure relief member 42 on the first support 31 is at least partially located in the first pressure relief hole 311, so that when the second battery cell 40b is ejected, the ejected material can break through the second pressure relief member 42 and enter the second pressure relief sub-region 103b through the first pressure relief hole 311 and the second pressure relief hole 321, thereby improving the throughput of the ejected material of the second battery cell 40b.

[0050] In some embodiments, the support component 30 may be integrally formed, that is, the first support portion 31 and the second support portion 32 are integrally formed, for example, an independent whole made by extrusion molding process. In this case, the first support portion 31 may be the wall portion of the support component 30 facing the first battery cell 40a or the second battery cell 40b, and the second support portion 32 may be the wall portion of the support component 30 facing the base plate 20. The first pressure relief hole 311 and the second pressure relief hole 321 are two parts of the same through hole.

[0051] In other embodiments, the support assembly 30 is composed of a first support portion 31 and a second support portion 32 that are independent of each other. The first support portion 31 and the second support portion 32 can be connected to each other by means of bolts, welding, bonding or other methods to form the support assembly 30.

[0052] In some embodiments, the support assembly 30 may be a thermal management component. Specifically, the first support portion 31 and the second support portion 32 are at least partially spaced apart and form a flow channel for containing a cooling medium to cool the first battery cell 40a and / or the second battery cell 40b. The flow channel is spaced apart from the first protrusion 301, the first pressure relief hole 311, and the second pressure relief hole 321; or the orthogonal projections of both the first pressure relief member 41 and the second pressure relief member 42 along the first direction X on the support assembly 30 are offset from the flow channel.

[0053] In some implementations, such as Figure 4 and Figure 10 As shown, in the area where the first cell 40a is located, to prevent the backflow of ejected material in the first pressure relief sub-region 103a from affecting other cells in the same area, the battery pack also includes a protective member 50. The protective member 50 is located on the side of the first cell 40a facing the first support portion 31, and the orthographic projection of the first pressure relief member 41 along the first direction X is located on the protective member 50. The protective member 50 is configured to be broken when the first cell 40a is depressurized, allowing the ejected material to pass through. Thus, when a certain first cell 40a depressurizes, the ejected material will only break the corresponding protective member 50 along the first direction X, allowing the ejected material to enter the first pressure relief sub-region 103a. The adjacent first cells 40a are protected from the backflow of ejected material due to the blocking effect of the protective member 50, thereby preventing heat spread. Similarly, in the area where the second cell 40b is located, to prevent the backflow of ejected material in the second pressure relief sub-region 103b from affecting other cells, such as... Figure 5 and Figure 10 As shown, the protective member 50 is also provided on the side of the second cell 40b facing the first support portion 31, and the orthographic projection of the second pressure relief member 42 along the first direction X is located on the protective member 50; wherein, the protective member 50 is configured to be destroyed when the second cell 40b is depressurized, allowing the ejected material to pass through; thus, when a certain second cell 40b depressurizes, the ejected material will only destroy the corresponding protective member 50 along the first direction X, allowing the ejected material to enter the second pressure relief sub-region 103b, while the other adjacent second cells 40b can be protected from the backflow of the ejected material due to the blocking effect of the protective member 50, thereby avoiding heat spread.

[0054] It should be noted that the purpose of the protective component 50 is to block the first pressure relief hole 311 or the second pressure relief hole 321, thereby isolating the first pressure relief component 41 and the first pressure relief sub-region 103a, and isolating the second pressure relief component 42 and the second pressure relief sub-region 103b. Therefore, in some embodiments, such as Figure 4 As shown, the protective member 50 can be disposed on the side of the first support portion 31 near the first battery cell 40a, and the protective member 50 covers the first pressure relief hole 311; in another embodiment, the protective member 50 can also be disposed on the side of the second support portion 32 away from the first support portion 31, and the protective member 50 covers the second pressure relief hole 321; in other embodiments, the protective member 50 can also be disposed in the first pressure relief hole 311 and connected to the hole wall of the first pressure relief hole 311, or the protective member 50 can be disposed in the second pressure relief hole 321 and connected to the inner wall of the second pressure relief hole 321.

[0055] In some implementations, such as Figure 4 , Figure 5 and Figure 10 As shown, the protective component 50 is provided with a damage area 51; along the first direction X, the thickness of the damage area 51 is less than the thickness of other areas of the protective component 50, and the orthographic projection of the damage area 51 at least partially overlaps with the first pressure relief component 41 and the first pressure relief hole 311, or the orthographic projection of the damage area 51 at least partially overlaps with the second pressure relief component 42 and the first pressure relief hole 311; this design makes the damage area 51 a weak area, which can be preferentially damaged when the first cell 40a or the second cell 40b is ejected, so that the ejected material can enter the corresponding pressure relief sub-area through the first pressure relief hole 311.

[0056] In other embodiments, the damaged area 51 is provided with grooves, which can also form a weak area on the protective member 50 and can be preferentially damaged when the first cell 40a or the second cell 40b is sprayed.

[0057] In some implementations, such as Figure 1 As shown, the housing assembly 10 includes a top cover 11 and a frame 12, as... Figure 3 and Figure 9As shown, the frame 12 has a first opening 101 and a second opening 104 on opposite sides along the first direction X. The upper cover 11 is connected to the frame 12 and closes the second opening 104. The support component 30 is connected to the frame 12 and closes the first opening 101. The upper cover 11, the frame 12 and the support component 30 together form a sealed space 102, so that the first battery cell 40a and the second battery cell 40b can be in a closed space to avoid interference from external factors. Further, the frame 12 includes a first side beam 121a and a second side beam 121b, and the support assembly 30 connects both the first side beam 121a and the second side beam 121b; the first side beam 121a is hollow to form a first cavity 122a, and the second side beam 121b is hollow to form a second cavity 122b, with the first cavity 122a and the second cavity 122b spaced apart; wherein the first cavity 122a communicates with the first pressure relief sub-region 103a and is configured to allow ejected material from the first pressure relief sub-region 103a to enter; and / or, The second cavity 122b communicates with the second pressure relief sub-region 103b and is configured to allow ejected material from the second pressure relief sub-region 103b to enter. By providing the first cavity 122a and the second cavity 122b on the frame 12, the pressure relief space volume can be further increased, enabling more effective containment and release of ejected material, and further improving the safety of the battery pack in the event of thermal runaway. When the first cell 40a experiences thermal runaway, the ejected material enters the first pressure relief sub-region 103a via the support assembly 30, and then enters the first cavity 122a, such as... Figure 2 The pressure relief path P1; when the second cell 40b experiences thermal runaway, the ejected material enters the second pressure relief sub-region 103b via the support assembly 30, and then enters the second cavity 122b, as shown. Figure 2 Pressure relief path P2.

[0058] In some embodiments, the first side beam 121a and the second side beam 121b are spaced apart along the second direction Y, that is, the first side beam 121a is located on the side of the first battery cell 40a away from the second battery cell 40b, and the second side beam 121b is located on the side of the second battery cell 40b away from the first battery cell 40a, thereby effectively realizing thermal runaway zone management.

[0059] In another embodiment, the first side beam 121a and the second side beam 121b are adjacent and connected, but the first cavity 122a and the second cavity 122b are not connected, which can also achieve thermal runaway zoning management and avoid cross-zone impact.

[0060] In some embodiments, the first side beam 121a and the second side beam 121b have the same structure. Taking the second side beam 121b as an example, for instance... Figure 7As shown, the second side beam 121b has a first inner wall 1211 and a first outer wall 1212, which are spaced apart along the second direction Y. The support assembly 30 is connected to the first inner wall 1211, and the second cavity 122b is located between the first inner wall 1211 and the first outer wall 1212. The first inner wall 1211, the support assembly 30, and the base plate 20 enclose a second pressure relief sub-area 103b. In order for the ejected material in the second pressure relief sub-area 103b to enter the second cavity 122b, the first inner wall 1211 is provided with a through hole 1211b connecting the second pressure relief sub-area 103b and the second cavity 122b.

[0061] In some implementation methods, please continue to refer to Figure 6 and Figure 7 To facilitate the connection between the support assembly 30 and the frame 12, the first inner wall 1211 is provided with a support portion 1211a extending along the second direction Y to the sealed space 102. Along the first direction X, the support portion 1211a is spaced apart from the bottom plate 20, and at least a portion of the support assembly 30 is connected to the support portion 1211a.

[0062] In some implementations, to further improve the safety of the battery pack, such as... Figure 1 and Figure 9 As shown, the first outer wall 1212 is provided with a third pressure relief hole 1212a, which communicates with the second cavity 122b. The battery pack also includes a balancing mechanism 70, which is located in the third pressure relief hole 1212a. It should be understood that the balancing mechanism 70 has a set threshold, which is configured to open when the pressure value in the second cavity 122b is greater than the set threshold, thereby discharging the high-temperature and high-pressure gas and ejected material out of the battery pack to improve the safety of the entire pack.

[0063] It should be noted that the structure of the first side beam 121a is the same as that of the second side beam 121b, that is, the first side beam 121a also has a first inner wall 1211 and a first outer wall 1212, as shown below. Figure 6 As shown, the first inner wall 1211 of the first side beam 121a has a through hole 1211b, which allows the first pressure relief sub-region 103a to communicate with the first cavity 122a. The first outer wall 1212 of the first side beam 121a has a third pressure relief hole 1212a. The third pressure relief hole 1212a is provided with a balancing mechanism 70, which allows the high-temperature and high-pressure gas and ejected material in the first cavity 122a to be discharged outside the battery pack. This will not be described in detail here.

[0064] In some embodiments, to avoid interference between the first battery cell 40a and the second battery cell 40b within the sealed space 102 during thermal runaway, for the following reasons, Figure 2As shown, the battery pack also includes a separator 80. Along the second direction Y, the separator 80 is disposed between the first cell 40a and the second cell 40b, thereby preventing the first cell 40a and the second cell 40b from interfering with each other in the sealed space 102, and thus realizing zoned management.

[0065] In some embodiments, the separator 80 is a beam that extends along a third direction Z and is integrated with the frame 12, thereby dividing the sealed space 102 into two independent spaces to meet the partition management of the first battery cell 40a and the second battery cell 40b.

[0066] In some implementation methods, please refer to Figure 10 and Figure 11 The second support portion 32 has a first flat portion 302 disposed adjacent to the first protrusion 301; the first protrusion 301 includes a first side wall 3011 and a first bottom wall 3012, the first flat portion 302 is connected to the first support portion 31, and the first side wall 3011 connects the first flat portion 302 and the first bottom wall 3012; in order to ensure the sealing effect between the first pressure relief sub-region 103a and the second pressure relief sub-region 103b, the battery pack also includes a sealing member 60, which is connected between the first bottom wall 3012 and the bottom plate 20 along the first direction X, so as to prevent the first pressure relief sub-region 103a and the second pressure relief sub-region 103b from being connected.

[0067] In some embodiments, the second support portion 32 further has a second recessed portion 303. Along the first direction X, the second recessed portion 303 protrudes in a direction away from the first cell 40a. Along the second direction Y, the second recessed portion 303 is spaced apart from the first protrusion 301, and the second recessed portion 303 and the first support portion 31 form a flow channel 304. This allows coolant to be introduced into the flow channel 304, thereby achieving rapid heat dissipation of the first cell 40a and the second cell 40b. In the event of thermal runaway of the first cell 40a and the second cell 40b, the coolant can promptly transfer heat to the outside of the battery pack, thereby reducing the risk of thermal spread of the entire pack.

[0068] In some embodiments, the first battery cell 40a and the second battery cell 40b are respectively connected to the first support portion 31 by thermally conductive adhesive, and the thermally conductive adhesive surrounds the first pressure relief hole 311. This can prevent the ejected material from the first battery cell 40a when it is in the valve from entering the sealed space 102 through the gap between the first battery cell 40a and the first support portion 31 and affecting other battery cells, or prevent the ejected material from the second battery cell 40b when it is in the valve from entering the sealed space 102 through the gap between the second battery cell 40b and the first support portion 31 and affecting other battery cells. This ensures that the ejected material from the first battery cell 40a and / or the second battery cell 40b when it is in the valve can enter the corresponding pressure relief sub-region, thereby avoiding thermal runaway and thermal propagation.

[0069] Additionally, it should be noted that this application only describes the battery pack as including a first cell 40a and a second cell 40b, and a first pressure relief sub-region 103a and a second pressure relief sub-region 103b corresponding to the first cell 40a and the second cell 40b, respectively. This is merely to explain the pressure relief methods of cells in different regions to avoid cross-region interference, and is not intended to limit the battery pack to only having cells in two regions. It is understood that when more cell regions are planned within the battery pack, the support assembly 30 can also be provided with multiple first protrusions 301, dividing the pressure relief space 103 into multiple pressure relief sub-regions corresponding to the cell regions, thereby achieving zoned pressure relief management. Furthermore, to facilitate the discharge of ejected material from the pressure relief sub-regions outside the battery pack, multiple independent cavities can also be planned inside the first side beam 121a and the second side beam 121b, thereby connecting with the pressure relief sub-regions of each cell region and preventing cross-region interference between cells in different regions. For those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

[0070] Example 2 The difference between this embodiment and Embodiment 1 is that: Please refer to Figure 12 and Figure 13 The first bottom wall 3012 includes a second flat portion 3012a and a second protrusion 3012b disposed adjacent to each other. The second protrusion 3012b connects the second flat portion 3012a and the first side wall 3011. Along the first direction X, the second flat portion 3012a is spaced apart from the bottom plate 20. A sealing member 60 is disposed between the second flat portion 3012a and the bottom plate 20. In this embodiment, by providing the second protrusion 3012b, the structural strength of the first bottom wall 3012 can be further improved. This improves the resistance to deformation and prevents the pressure relief sub-region of the first protrusion 301 from deforming due to excessive instantaneous pressure on the Y side of the second direction, thus avoiding the impact of thermal runaway. In addition, the second protrusion 3012b and the second flattened part 3012a can form a groove structure, so that the seal 60 can be located in the groove structure, which can limit and fix the seal 60, and prevent the seal 60 from shifting after the pressure in the pressure relief sub-region increases, thus ensuring the airtightness of the pressure relief sub-region.

[0071] In some embodiments, to further improve the sealing effect, the seal 60 is at least partially located between the second protrusion 3012b and the base plate 20; this increases the contact area between the seal 60 and the first bottom wall 3012, improves the sealing effect, and along the first direction X, the seal 60 can support the second protrusion 3012b, preventing the second protrusion 3012b from rubbing against the base plate 20 and deforming.

[0072] Example 3 The difference between this embodiment and Embodiment 2 is as follows: Please refer to Figure 14 and Figure 15 The base plate 20 has a third flat portion 21 and a protrusion 22 arranged adjacent to each other, and the protrusion 22 protrudes towards the first battery cell 40a relative to the third flat portion 21; along the first direction X, the protrusion 22 is aligned with and spaced apart from the second flat portion 3012a, and the third flat portion 21 is aligned with and spaced apart from the second protrusion 3012b; the sealing member 60 is disposed between the protrusion 22 and the second flat portion 3012a; thus, by providing the protrusion 22 on the base plate 20, the second flat portion 3012a and the second protrusion 3012b can be matched in the first direction X, thereby providing support for the first bottom wall 3012; at the same time, the protrusion 22 can also limit the first protrusion 301 in the second direction Y, further improving the connection strength between the first protrusion 301 and the base plate 20.

[0073] In some embodiments, the seal 60 is at least partially disposed between the second protrusion 3012b and the third flat portion 21, and is able to support the second protrusion 3012b and prevent the second protrusion 3012b from rubbing against the third flat portion 21 and deforming.

[0074] Example 4 The difference between this embodiment and Embodiment 1 is that: Please refer to Figure 16 and Figure 17 The base plate 20 has a first recess 23, which protrudes in the direction away from the first cell 40a along the first direction X. The first protrusion 301 is partially accommodated in the first recess 23. The sealing member 60 is at least partially located between the first recess 23 and the first bottom wall 3012. Thus, by providing the first recess 23, a portion of the first protrusion 301 can be accommodated in the first direction X, thereby limiting the first protrusion 301 in the second direction Y. This effectively prevents the pressure relief sub-region of the first protrusion 301 from becoming too high instantaneously and deforming, thus avoiding the impact of thermal runaway.

[0075] The working process for this application is as follows: like Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, when the first cell 40a experiences thermal runaway, the ejected material sequentially breaks through the first pressure relief component 41 and the damage area 51 along the first direction X, and enters the first pressure relief sub-region 103a through the first pressure relief hole 311 and the second pressure relief hole 321. The ejected material in the first pressure relief sub-region 103a further enters the first cavity 122a through the through hole 1211b, and finally is discharged from the battery pack through the balancing mechanism 70; the pressure relief path of the first cell 40a is as follows. Figure 2 P1 pressure relief path; like Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, when the second cell 40b experiences thermal runaway, the ejected material sequentially breaks through the second pressure relief component 42 and the damage area 51 along the first direction X, and enters the second pressure relief sub-region 103b through the first pressure relief hole 311 and the second pressure relief hole 321. The ejected material in the second pressure relief sub-region 103b further enters the second cavity 122b through the through hole 1211b, and finally is discharged from the battery pack through the balancing mechanism 70; the pressure relief path of the second cell 40b is as follows. Figure 2 P2 pressure relief path.

[0076] In summary, this application provides a battery pack in which the battery pack is divided into a sealed space 102 for placing battery cells 40 and a pressure relief space 103 by a support component 30. The pressure relief space 103 is further divided into a first pressure relief sub-region 103a and a second pressure relief sub-region 103b by a first protrusion 301. This ensures that the first battery cell 40a corresponds to the first pressure relief sub-region 103a, and the second battery cell 40b corresponds to the second pressure relief sub-region 103b. When the first battery cell 40a is activated, the ejected material enters the first pressure relief sub-region 103b. The first pressure relief sub-region 103a, due to the isolation effect of the first protrusion 301, can prevent ejected material from entering the second pressure relief sub-region 103b, thereby preventing the ejected material from affecting the second cell 40b. Similarly, when the second cell 40b ejects material, it enters the second pressure relief sub-region 103b without affecting the first cell 40a. This application can effectively reduce the number of cells affected by heat propagation when the battery pack experiences thermal runaway, thereby improving the overall reliability and safety of the battery pack.

[0077] The above description is merely a preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application. The basic principles, main features, and advantages of this application have been shown and described above. For those skilled in the art, it is obvious that this application is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this application.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack having a first direction (X), characterized in that, include: The housing assembly (10) has a first opening (101) on one side along the first direction (X). The support component (30) covers the first opening (101) and together with the box component (10) forms a sealed space (102). A base plate (20) is connected to the housing assembly (10) and located on the side of the support assembly (30) away from the sealed space (102); the base plate (20) and the support assembly (30) are spaced apart to form a pressure relief space (103). The first battery cell (40a) and the second battery cell (40b) are spaced apart in the sealed space (102) and are both connected to the support assembly (30); The support component (30) has a first protrusion (301) that protrudes away from the first battery cell (40a) along the first direction (X) and is connected to the base plate (20) to divide the pressure relief space (103) into a first pressure relief sub-region (103a) and a second pressure relief sub-region (103b) that are isolated from each other. Along the first direction (X), the first pressure relief sub-region (103a) corresponds to the first battery cell (40a) and the second pressure relief sub-region (103b) corresponds to the second battery cell (40b). The first pressure relief sub-region (103a) is configured to collect thermal runaway ejections from the first battery cell (40a) and the second pressure relief sub-region (103b) is configured to collect thermal runaway ejections from the second battery cell (40b).

2. The battery pack according to claim 1, characterized in that, The support component (30) includes: The first support part (31) is connected to the housing assembly (10), and the first support part (31) and the housing assembly (10) enclose the sealed space (102). The first battery cell (40a) and the second battery cell (40b) are both connected to the first support part (31). The first support part (31) is provided with a first pressure relief hole (311) that extends through the first direction (X). The second support (32) is connected to the side of the first support (31) facing away from the sealed space (102) along the first direction (X). The second support (32) and the bottom plate (20) together enclose the pressure relief space (103). The first protrusion (301) is provided on the second support (32). The second support (32) is provided with a second pressure relief hole (321) that passes through along the first direction (X). Along the first direction (X), the first pressure relief hole (311) corresponds to the second pressure relief hole (321), and the first pressure relief hole (311) and the second pressure relief hole (321) are configured to allow the ejected material to enter and pass through.

3. The battery pack according to claim 2, characterized in that, The first battery cell (40a) includes a first pressure relief member (41); the first pressure relief member (41) is disposed at one end of the first battery cell (40a) facing the first support portion (31), and along the first direction (X), the orthographic projection of the first pressure relief member (41) on the first support portion (31) is at least partially located in the first pressure relief hole (311). The battery pack also includes: A protective member (50) is provided on the side of the first cell (40a) facing the first support (31), and the orthographic projection of the first pressure relief member (41) along the first direction (X) is located on the protective member (50); The protective element (50) is configured to be broken when the first cell (40a) is valved, allowing the ejected material to pass through.

4. The battery pack according to claim 3, characterized in that, The protective component (50) is provided with a damage area (51); Along the first direction (X), the thickness of the damaged area (51) is less than the thickness of other areas of the protective member (50), and the orthographic projection of the damaged area (51) at least partially overlaps with the first pressure relief member (41) and the first pressure relief hole (311); or, The damaged area (51) has markings.

5. The battery pack according to claim 2, characterized in that, The first protrusion (301) is sealed to the base plate (20).

6. The battery pack according to claim 5, characterized in that, The second support portion (32) has a first flat portion (302) disposed adjacent to the first protrusion (301); the first protrusion (301) includes a first side wall (3011) and a first bottom wall (3012), the first flat portion (302) is connected to the first support portion (31), and the first side wall (3011) connects the first flat portion (302) and the first bottom wall (3012). It also includes a seal (60) along the first direction (X), the seal (60) being at least partially connected between the first bottom wall (3012) and the bottom plate (20).

7. The battery pack according to claim 6, characterized in that, The first bottom wall (3012) includes a second flat portion (3012a) and a second protrusion (3012b) disposed adjacent to each other. The second protrusion (3012b) connects the second flat portion (3012a) and the first side wall (3011). Along the first direction (X), the second flat portion (3012a) is spaced apart from the bottom plate (20). The sealing element (60) is disposed between the second flat portion (3012a) and the base plate (20), and the sealing element (60) is at least partially located between the second protrusion (3012b) and the base plate (20).

8. The battery pack according to claim 7, characterized in that, The base plate (20) has a third flat portion (21) and a protrusion (22) arranged adjacent to each other, and the protrusion (22) protrudes relative to the third flat portion (21) in a direction closer to the first battery cell (40a); along the first direction (X), the protrusion (22) is aligned with and spaced apart from the second flat portion (3012a), and the third flat portion (21) is aligned with and spaced apart from the second protrusion (3012b); The sealing element (60) is disposed between the protrusion (22) and the second flat portion (3012a), and the sealing element (60) is at least partially disposed between the second protrusion (3012b) and the third flat portion (21).

9. The battery pack according to claim 6, characterized in that, The base plate (20) has a first recess (23) along the first direction (X), the first recess (23) protrudes in a direction away from the first battery cell (40a), and the first protrusion (301) is partially accommodated in the first recess (23); The seal (60) is at least partially located between the first recess (23) and the first bottom wall (3012).

10. The battery pack according to claim 2, characterized in that, The second support portion (32) also has a second recessed portion (303). Along the first direction (X), the second recessed portion (303) protrudes in a direction away from the first battery cell (40a). The second recessed portion (303) is spaced apart from the first protruding portion (301), and the second recessed portion (303) and the first support portion (31) enclose an outlet channel (304).

11. The battery pack according to claim 2, characterized in that, The first support part (31) and the second support part (32) are integrally formed.

12. The battery pack according to any one of claims 1-11, characterized in that, The housing assembly (10) includes: Top cover (11); The frame (12) has a first opening (101) and a second opening (104) on opposite sides along the first direction (X). The upper cover (11) is connected to the frame (12) and closes the second opening (104). The upper cover (11), the frame (12) and the support component (30) together enclose the sealed space (102). The frame (12) includes a first side beam (121a) and a second side beam (121b), and the support component (30) connects the first side beam (121a) and the second side beam (121b) simultaneously; the first side beam (121a) is hollow to form a first cavity (122a), and the second side beam (121b) is hollow to form a second cavity (122b), and the first cavity (122a) and the second cavity (122b) are spaced apart; The first cavity (122a) is in communication with the first pressure relief sub-region (103a) and is configured to allow the ejected material from the first pressure relief sub-region (103a) to enter; and / or, The second cavity (122b) communicates with the second pressure relief sub-region (103b) and is configured to allow the ejected material from the second pressure relief sub-region (103b) to enter.

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