Battery box, battery system and electric device

Abstract

This application discloses a battery housing, a battery system, and an electrical device, relating to the field of energy storage equipment technology. The battery housing includes a top cover, a bottom cover, and at least two frames; the at least two frames are stacked sequentially along their height, each frame having an internal cavity with open ends at opposite ends along the height direction, thus allowing the internal cavities of the at least two frames to communicate with each other; the top cover and bottom cover are respectively connected to the ends of the at least two frames furthest apart in the height direction, thereby sealing the battery housing. The battery housing, battery system, and electrical device disclosed in this application help reduce the overall weight and cost of the battery system and are easy to assemble.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, specifically to a battery housing, a battery system, and an electrical device. Background Technology

[0002] Battery systems are a key component of new energy electric vehicles. As the development of new energy electric vehicles progresses, the energy requirements for battery systems are also increasing. Therefore, battery systems typically contain two or more battery packs.

[0003] In related technologies, battery system designs typically involve fixing multiple battery packs to a single housing frame, or fixing multiple battery packs independently to the vehicle. However, fixing multiple battery packs to a housing frame increases the overall vehicle weight and cost, while fixing them independently to the vehicle requires consideration of assembly clearances, increasing space utilization and assembly complexity. Utility Model Content

[0004] In view of this, this application provides a battery housing, a battery system, and an electrical device that helps reduce the overall weight and cost of the battery system and is easy to assemble.

[0005] The specific technical solution adopted in this application is as follows:

[0006] One embodiment of this application provides a battery housing, which includes a top cover, a bottom protective plate, and at least two housing frames;

[0007] The at least two box frames are stacked and connected sequentially along the height direction, each box frame has an inner cavity and is open at opposite ends along the height direction, so that the inner cavities of the at least two box frames are interconnected;

[0008] The top cover and the bottom cover are respectively connected to the two ends of the at least two box frames that are furthest apart in the height direction, thereby enclosing the battery box.

[0009] Optionally, the at least two box frames include a first box frame connected to the top cover plate, and at least one second box frame located on the side of the first box frame away from the top cover plate;

[0010] The first open end of the first box frame is provided with a hanging component, and the second open end of the first box frame is provided with a first fixing component;

[0011] The second box frame is provided with a second fixing member at its first open end, and the second box frame is provided with the first fixing member at its second open end;

[0012] The first open end and the second open end are the two opposite ends of the box frame along the height direction, and the first open end is closer to the top cover plate than the second open end.

[0013] Optionally, the box frame has two first outer side walls opposite each other along a first direction and two second outer side walls opposite each other along a second direction, one of the first direction and the second direction being parallel to the length direction of the box frame, and the other of the first direction and the second direction being parallel to the width direction of the box frame;

[0014] The first fixing member includes at least one of a first fixing part and a second fixing part, and the second fixing member includes at least one of a third fixing part and a fourth fixing part, wherein the first fixing part and the third fixing part are located on the first outer side wall of the box frame, and the second fixing part and the fourth fixing part are located on the second outer side wall of the box frame;

[0015] Each of the box frames is connected to the third fixing part of the adjacent box frame through the first fixing part, and to the fourth fixing part of the adjacent box frame through the second fixing part.

[0016] Optionally, the first fixing part includes a first U-shaped frame, the opening side of the first U-shaped frame is connected to the first outer side wall, and a first fixing hole is provided through the first U-shaped frame along the height direction;

[0017] The third fixing part includes a second C-shaped frame, the open side of the second C-shaped frame is connected to the first outer side wall, and a second fixing hole is provided through the second C-shaped frame along the height direction;

[0018] The battery housing also includes a first fastener, which is inserted into a first fixing hole in one of the housing frames and a second fixing hole in the other housing frame.

[0019] Optionally, the first fixing part further includes a first support plate, one side of the first support plate is connected to the first shaped frame and located between the first fixing hole and the first outer side wall, and the other side of the first support plate is connected to the first outer side wall and spaced apart from the first shaped frame;

[0020] And / or,

[0021] The third fixing part further includes a second support plate, one side of which is connected to the second C-shaped frame and located between the second fixing hole and the first outer side wall, and the other side of which is connected to the first outer side wall and spaced apart from the second C-shaped frame.

[0022] Optionally, at least a portion of the surface of the first C-shaped frame away from the first support plate is coplanar with the end face of the second open end where the first fixing part is located;

[0023] At least a portion of the surface of the second C-shaped frame away from the second support plate is coplanar with the end face of the first open end where the third fixing part is located.

[0024] Optionally, at least one of the first C-shaped frames of the box frame is further provided with a positioning hole, the positioning hole passing through the first C-shaped frame along the height direction, and the positioning hole being spaced apart from the first fixing hole;

[0025] The second C-shaped frame is provided with a positioning pin extending along the height direction. The positioning pin is spaced apart from the second fixing hole and can pass through the positioning hole.

[0026] Optionally, the second fixing part includes a third fixing hole disposed on the second outer side wall, and the fourth fixing part includes a fourth fixing hole disposed on the second outer side wall;

[0027] The battery housing also includes a connector, a second fastener, and a third fastener. The connector is provided with a fifth fixing hole and a sixth fixing hole. The second fastener passes through the fifth fixing hole and the third fixing hole, and the third fastener passes through the sixth fixing hole and the fourth fixing hole.

[0028] Optionally, a first groove and a second groove are provided at intervals along the height direction on the second outer side wall, and the sides of the first groove and the second groove that are far away from each other extend to the end face of the first open end and the end face of the second open end, respectively.

[0029] The third fixing hole is located on the bottom wall of the first groove, and the fourth fixing hole is located on the bottom wall of the second groove. A portion of the connector and at least a portion of the second fastener are accommodated inside the first groove, and another portion of the connector and at least a portion of the third fastener are accommodated inside the second groove.

[0030] Optionally, the hanging component includes at least one of a lifting part and a mounting part, wherein the lifting part is used to lift the battery box, and the mounting part is used to install the battery box onto the carrier.

[0031] Optionally, the at least two box frames further include a third box frame, the third box frame being located on the side of the at least one second box frame away from the first box frame;

[0032] The third box frame is provided with the second fixing member at its first open end. The third box frame is connected to the first fixing member of the adjacent second box frame through the second fixing member. The second open end of the third box frame is connected to the bottom guard plate.

[0033] Optionally, each of the box frames includes a first side beam, a second side beam, a third side beam, a fourth side beam, and two expansion beams;

[0034] The first side beam, the second side beam, the third side beam, and the fourth side beam are sequentially and closedly connected along the circumference of the box frame;

[0035] The two expansion beams are located within the space enclosed by the first side beam, the second side beam, the third side beam, and the fourth side beam and are spaced apart from each other. The two sides of each expansion beam are respectively connected to the first side beam and the third side beam, and the beam wall of each expansion beam away from the other expansion beam is in contact with or connected to the beam wall of the adjacent second side beam or fourth side beam through ribs.

[0036] Optionally, the top cover plate and the box frame, two adjacent box frames, and the box frame and the bottom protective plate are all sealed connections.

[0037] Another aspect of this application provides a battery system, which includes a plurality of cell assemblies and the battery housing described above, wherein the cell assemblies are housed in the cavities of at least two frames of the battery housing.

[0038] Another aspect of this application provides an electrical device, which includes a device body and the battery system described above, wherein the device body is powered by the battery system.

[0039] In the battery case provided in this application embodiment, at least two frames for accommodating and installing battery cell components are stacked and connected sequentially along the height direction to form an internally connected frame structure; the top cover plate and the bottom cover plate are respectively connected to the two ends of the at least two frames to close the internally connected frame structure so that the battery case is completely enclosed. In this battery box, at least two frames are directly stacked together, and the top cover and bottom guard plate are also directly connected to the frames. Therefore, compared to the related technologies where a single frame is sealed to form an independent battery box, and then multiple independent battery boxes are assembled using a single frame, the battery box solution provided in this application does not require an additional frame, reducing the weight and cost of the battery box. Compared to the related technologies where a single frame is individually sealed to form an independent battery box, and then each battery box is independently fixed to the vehicle, the battery box solution provided in this application does not need to consider the assembly gaps of each independent battery box on the vehicle. Instead, it can be directly installed on the vehicle as a whole, thereby reducing assembly difficulty and improving the utilization rate of vehicle space when arranged in the vehicle. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a battery box provided in an embodiment of this application;

[0042] Figure 2 yes Figure 1 A partial exploded view of the battery box shown.

[0043] Figure 3 yes Figure 1 Exploded view of the battery box shown;

[0044] Figure 4 This is an assembly diagram of a second box frame, a connector, a second fastener, and a third fastener provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the assembly of a second box frame and a first fastener provided in an embodiment of this application;

[0046] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0047] Figure 7This is a schematic diagram of the assembly of a first box frame and a first fastener provided in an embodiment of this application;

[0048] Figure 8 yes Figure 7 Enlarged view of point B in the middle;

[0049] Figure 9 This is a schematic diagram of the structure of a first box frame provided in an embodiment of this application;

[0050] Figure 10 This is a cross-sectional structural diagram of a first box frame provided in an embodiment of this application.

[0051] Figure label:

[0052] 1. Top cover plate;

[0053] 2. Bottom protective plate;

[0054] 3. Box frame; 301. First open end; 302. Second open end; 303. First outer side wall; 304. Second outer side wall; 305. First groove; 306. Second groove; 307. First side beam; 308. Second side beam; 309. Third side beam; 3010. Fourth side beam; 3011. Expansion beam; 3012. Rib; 3013. Gap; 31. First box frame; 32. Second box frame; 33. Hanging component; 331. Lifting part; 332. Mounting part; 34. 341. First fixing part; 3411. First C-shaped frame; 3412. First fixing hole; 3413. First support plate; 3414. Positioning hole; 342. Second fixing part; 3421. Third fixing hole; 35. Second fixing part; 351. Third fixing part; 3511. Second C-shaped frame; 3512. Second fixing hole; 3513. Second support plate; 3514. Positioning pin; 352. Fourth fixing part; 3521. Fourth fixing hole; 36. Third box frame;

[0055] 4. First fastener;

[0056] 5. Connector; 51. Fifth fixing hole; 52. Sixth fixing hole;

[0057] 6. Second fastener;

[0058] 7. Third fastener. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0061] This application provides a battery housing, such as... Figure 1 and Figure 2 As shown, the battery box includes a top cover plate 1, a bottom protective plate 2, and at least two box frames 3. The at least two box frames 3 are stacked and connected sequentially along the height direction, where the height direction refers to the height direction of the battery box and also the height direction of the box frames 3. Each box frame 3 has an internal cavity and is open at opposite ends along the height direction, thus allowing the internal cavities of the at least two box frames 3 stacked sequentially along the height direction to communicate with each other. The top cover plate 1 and the bottom protective plate 2 are respectively connected to the ends of the at least two box frames 3 that are furthest apart in the height direction, thereby enclosing the battery box; that is, the internal space of the battery box is a closed space.

[0062] In the battery box provided in this application embodiment, at least two box frames 3 for accommodating and installing battery cell components are stacked and connected sequentially along the height direction to form an internally connected box frame structure; the top cover plate 1 and the bottom protective plate 2 are respectively connected to the two ends of the at least two box frames 3 to close the internally connected box frame structure so that the battery box is completely closed. Since at least two battery boxes 3 are directly stacked together in the battery box provided in this application embodiment, and the top cover plate 1 and the bottom protective plate 2 are also directly connected to the battery box 3, compared with the installation method in the related technology of sealing a single battery box to form an independent battery box and then assembling multiple independent battery boxes through a box frame, the battery box solution provided in this application embodiment does not require additional box frame preparation, thereby reducing the weight and cost of the battery box. Therefore, when this battery box is applied to new energy vehicles, it helps to reduce the weight and cost of the entire vehicle. Compared with the installation method in the related technology of sealing a single battery box to form an independent battery box and then fixing each battery box to the vehicle independently, the battery box solution in this application embodiment does not need to consider the assembly gap of each independent battery box on the vehicle. Instead, it can be directly installed on the vehicle as a whole, thereby reducing the assembly difficulty and improving the utilization rate of the vehicle space layout.

[0063] Figure 3 This is an exploded view of a battery box provided in an embodiment of this application. Figure 3As shown, in some embodiments of this application, at least two box frames 3 stacked and connected sequentially along the height direction include a first box frame 31 connected to the top cover plate 1, and at least one second box frame 32 located on the side of the first box frame 31 away from the top cover plate 1. The side of the first box frame 31 away from the top cover plate 1 is connected to the adjacent second box frame 32, and the side of any second box frame 32 away from the first box frame 31 may be connected to another adjacent second box frame 32, or may be connected to the bottom protective plate 2.

[0064] like Figure 3 As shown, the first open end 301 of the first box frame 31 is provided with a hanging member 33, and the second open end 302 of the first box frame 31 is provided with a first fixing member 34.

[0065] It should be noted that, in this embodiment, each box frame 3 (including the first box frame 31 and the second box frame 32) has two open ends opposite each other along the height direction. These two open ends are the first open end 301 and the second open end 302, respectively, wherein the first open end 301 is closer to the side where the top cover plate 1 is located than the second open end 302. For example, for the first box frame 31, the first open end 301 of the first box frame 31 is connected to the top cover plate 1, and the second open end 302 of the first box frame 31 is connected to the first open end 301 of the adjacent second box frame 32.

[0066] The hanging bracket 33 is used to lift or mount the battery box. In some embodiments, such as Figure 8 As shown, the hanging component 33 may include at least one of a lifting part 331 and a mounting part 332, wherein the lifting part 331 is used to lift the battery box and the mounting part 332 is used to install the battery box onto the carrier.

[0067] Optionally, at least one lifting part 331 is provided on each of the two opposite outer side walls of the first box frame 31, and each lifting part 331 includes two lifting lugs spaced apart on the outer side wall of the first box frame 31. For example, as shown... Figure 9 As shown, two lifting lugs are respectively provided on the two opposite outer side walls of the first box frame 31 to lift the battery box, thereby facilitating the transfer of the battery box.

[0068] Optionally, at least one mounting portion 332 is provided on each of the two opposite outer side walls of the first box frame 31. Each mounting portion 332 includes at least one mounting point structure disposed on the outer side wall of the first box frame 31, and each mounting point structure has at least one through-hole. For example, see Figure 9 One outer wall of the first box frame 31 ( Figure 9 Two mounting point structures are provided on the left outer wall of the first box frame 31, each of which has a through mounting hole; the other outer wall of the first box frame 31 ( Figure 9 A mounting point structure with two through-holes is provided on the right outer wall of the battery box. The mounting part 332 can firmly fix the battery box to the installation position (such as the car chassis) by means of bolts, clips, welding, etc., thereby ensuring that the battery will not be displaced or fall off due to vibration, impact or gravity during operation.

[0069] See also Figure 3 The first open end 301 of the second box frame 32 is provided with a second fixing member 35, and the second open end 302 of the second box frame 32 is provided with a first fixing member 34. The first fixing member 34 can be connected to the second fixing member 35. For example, the first fixing member 34 on the second open end 302 of the first box frame 31 can be connected to the second fixing member 35 on the first open end 301 of the adjacent second box frame 32, thereby fixing the first box frame 31 and the second box frame 32 together.

[0070] In other words, for any two adjacent frames 3 in the battery box provided in this application embodiment, the open ends of the two adjacent frames 3 are respectively provided with a first fixing member 34 and a second fixing member 35, so that the open ends of the two adjacent frames 3 are fixedly connected by the first fixing member 34 and the second fixing member 35.

[0071] like Figure 3 As shown, the box frame 3 in this embodiment is typically square or rectangular. For ease of description, the outermost walls of the box frame 3 in this embodiment are defined. Figure 4 As shown, for each box frame 3, the box frame 3 has two first outer side walls 303 opposite each other along a first direction, and two second outer side walls 304 opposite each other along a second direction. One of the first and second directions is parallel to the length direction of the box frame 3, and the other of the first and second directions is parallel to the width direction of the box frame 3. For example, in... Figure 4 In the middle, the two first outer side walls 303 of the box frame 3 are opposite each other in the length direction of the box frame 3, and the two second outer side walls 304 of the box frame 3 are opposite each other in the width direction of the box frame 3.

[0072] In some embodiments of this application, such as Figure 4 As shown, the first fixing member 34 includes at least one of a first fixing part 341 and a second fixing part 342; as Figure 5As shown, the second fixing member 35 includes at least one of a third fixing part 351 and a fourth fixing part 352. The first fixing part 341 and the third fixing part 351 may be located on at least one first outer side wall 303 of the box frame 3, and the second fixing part 342 and the fourth fixing part 352 may be located on at least one second outer side wall 304 of the box frame 3. Any box frame 3 can be connected to the third fixing part 351 of an adjacent box frame 3 via the first fixing part 341, and can be connected to the fourth fixing part 352 of an adjacent box frame 3 via the second fixing part 342.

[0073] By connecting the first fixing part 341 with the third fixing part 351 and the second fixing part 342 with the fourth fixing part 352, direct fixing between two adjacent and stacked box frames 3 is achieved without the need for an additional box frame, thus saving costs. Furthermore, since the first fixing part 341 and the third fixing part 351 are provided on the two first outer side walls 303 of the box frame 3, and the second fixing part 342 and the fourth fixing part 352 are provided on the two second outer side walls 304 of the box frame 3, a firm and reliable connection can be ensured on the outer side walls in all directions of the two adjacent box frames 3. The resulting stacked box frame has high rigidity and strength.

[0074] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the first fixing part 341 includes a first C-shaped frame 3411, the open side of which is connected to the first outer side wall 303, and a first fixing hole 3412 is provided through the first C-shaped frame 3411 along the height direction; the third fixing part 351 includes a second C-shaped frame 3511, the open side of which is connected to the first outer side wall 303, and a second fixing hole 3512 is provided through the second C-shaped frame 3511 along the height direction. The battery box also includes a first fastener 4, which passes through the first fixing hole 3412 of one box frame 3 and the second fixing hole 3512 of the other box frame 3.

[0075] Optionally, the first fastener 4 can be a bolt, rivet, or other fastening component. Figure 6 The illustration shows the case where the first fastener 4 is a bolt. The bolt passes through the first fixing hole 3412 of one frame 3 and the second fixing hole 3512 of the other frame 3, thereby fastening the first and second brackets 3411 and 3511, thus achieving the fastening of two adjacent frames 3. This is easy to assemble and has good connection reliability. Moreover, since the bolt is detachable, it also facilitates the disassembly and maintenance of the battery box.

[0076] Optionally, the first fastener 4 may also include a sleeve or washer fitted on the outside of the bolt, thereby improving the fastening effect of the first fastener 4 on the first I-shaped bracket 3411 and the second I-shaped bracket 3511, making the connection less prone to loosening.

[0077] In some embodiments of this application, such as Figure 6 As shown, the first fixing part 341 also includes a first support plate 3413. One side of the first support plate 3413 is connected to the first C-shaped frame 3411 and is located between the first fixing hole 3412 and the first outer side wall 303. The other side of the first support plate 3413 is connected to the first outer side wall 303 and is spaced apart from the first C-shaped frame 3411. The first support plate 3413 serves to provide support and improve the compressive strength of the first C-shaped frame 3411, thereby ensuring that the connection between the first C-shaped frame 3411 and the second C-shaped frame 3511 is not easily deformed or damaged when the battery box is subjected to external impact.

[0078] Similarly, see also Figure 6 The third fixing part 351 may also include a second support plate 3513. One side of the second support plate 3513 is connected to the second C-shaped frame 3511 and is located between the second fixing hole 3512 and the first outer side wall 303. The other side of the second support plate 3513 is connected to the first outer side wall 303 and is spaced apart from the second C-shaped frame 3511. The second support plate 3513 serves to provide support and improve the compressive strength of the second C-shaped frame 3511, thereby ensuring that the connection between the first C-shaped frame 3411 and the second C-shaped frame 3511 is not easily deformed or damaged when the battery box is subjected to external impact.

[0079] In some embodiments of this application, such as Figure 6 As shown, at least a portion of the surface of the first C-shaped frame 3411 away from the first support plate 3413 is coplanar with the end face of the second open end 302 where the first fixing part 341 is located; at least a portion of the surface of the second C-shaped frame 3511 away from the second support plate 3513 is coplanar with the end face of the first open end 301 where the third fixing part 351 is located. This ensures that not only the end faces of the first open end 301 and the second open end 302 contact each other between two adjacent frames 3, but also the lower surfaces of the first C-shaped frame 3411 and the upper surfaces of the second C-shaped frame 3511 contact each other. This increases the contact area between the two adjacent frames 3 during stacking, improving the sealing of the stacked connection and preventing stress concentration on the battery box, thus enhancing the impact resistance of the battery box.

[0080] In some embodiments of this application, such as Figure 7 and Figure 8As shown, at least one box frame 3 has a positioning hole 3414 on its first C-shaped frame 3411. The positioning hole 3414 extends through the first C-shaped frame 3411 along the height direction, and is spaced apart from the first fixing hole 3412. Figure 6 As shown, the second C-shaped frame 3511 is provided with a positioning pin 3514 extending along the height direction. The positioning pin 3514 is spaced apart from the second fixing hole 3512, and the positioning pin 3514 can pass through the positioning hole 3414.

[0081] For example, for any two adjacent box frames 3, the positioning pin 3514 of one box frame 3 passes through the positioning hole 3414 of the other box frame 3, thus realizing the relative positioning of the two box frames 3, which facilitates subsequent connection and assembly.

[0082] Optionally, the number of positioning holes 3414 is at least two, and they are distributed on opposite sides of the first fixing hole 3412; the number of positioning pins 3514 is at least two, and they are distributed on opposite sides of the second fixing hole 3512. In this way, when the positioning pins 3514 and positioning holes 3414 are assembled, the first fixing hole 3412 and its corresponding second positioning hole 3414 will naturally be in the same position, thereby improving the assembly and positioning efficiency of adjacent frames 3 and facilitating the automated assembly of the battery box.

[0083] In some embodiments of this application, such as Figure 4 As shown, the second fixing part 342 includes a third fixing hole 3421 provided on the second outer side wall 304, and the fourth fixing part 352 includes a fourth fixing hole 3521 provided on the second outer side wall 304. The number of third fixing holes 3421 is at least one, and the number of fourth fixing holes 3521 is at least one.

[0084] The battery housing also includes a connector 5, a second fastener 6, and a third fastener 7. The connector 5 is provided with a fifth fixing hole 51 and a sixth fixing hole 52. The second fastener 6 passes through the fifth fixing hole 51 and the third fixing hole 3421, and the third fastener 7 passes through the sixth fixing hole 52 and the fourth fixing hole 3521. The number of connectors 5, second fasteners 6, and third fasteners 7 is at least one, and the number of fifth fixing holes 51 and sixth fixing holes 52 is at least one. In one example, the number of third fixing holes 3421, fifth fixing holes 51, and second fasteners 6 are equal; the number of fourth fixing holes 3521, sixth fixing holes 52, and third fasteners 7 are equal. Since two adjacent housing frames 3 are also connected by connectors 5, second fasteners 6, and third fasteners 7, a fixed connection between the two housing frames 3 based on the second outer side wall 304 is achieved.

[0085] Optionally, the second fastener 6 and the third fastener 7 are selected from fastening parts such as bolts and rivets. Figure 4 The diagram illustrates a case where both the second fastener 6 and the third fastener 7 are bolts. The second fastener 6 passes through the fifth fixing hole 51 on the connector 5 and the third fixing hole 3421 on the housing frame 3, fixing the connector 5 to the housing frame 3. The third fastener 7 passes through the sixth fixing hole 52 on the connector 5 and the fourth fixing hole 3521 on another housing frame 3, fixing the connector 5 to the other housing frame 3. Thus, the two housing frames 3 are indirectly connected via the connector 5. This connection method is easy to assemble and has good reliability. Moreover, since the bolts are detachable, it also facilitates the disassembly and maintenance of the battery housing.

[0086] Optionally, at least one of the second fastener 6 and the third fastener 7 may also include a sleeve or washer fitted over the outside of the bolt, thereby improving the connection between the bolt and the connector 5 and the box frame 3, making the connection less prone to loosening.

[0087] In some embodiments of this application, such as Figure 4 and Figure 5 As shown, a first groove 305 and a second groove 306 are spaced apart along the height direction on the second outer side wall 304, and the sides of the first groove 305 and the second groove 306 that are far apart from each other extend to the end faces of the first open end 301 and the second open end 302, respectively. A third fixing hole 3421 is located on the bottom wall of the first groove 305, and a fourth fixing hole 3521 is located on the bottom wall of the second groove 306. Each groove is perpendicular to the opening of the second outer side wall 304, and the bottom wall refers to the groove wall opposite to the opening end of the groove.

[0088] like Figure 2 As shown, a portion of the connector 5 and at least a portion of the second fastener 6 are accommodated inside the first groove 305, and another portion of the connector 5 and at least a portion of the third fastener 7 are accommodated inside the second groove 306. This prevents the connector 5, the second fastener 6, and the third fastener 7 from protruding from the second outer wall 304, thus protecting them. Furthermore, the arrangement of the first groove 305 and the second groove 306 facilitates the assembly and positioning of the connector 5.

[0089] It should be noted that, in this embodiment of the application, when both first outer side walls 303 of the box frame 3 are provided with first fixing parts 341, the size and specific style of the two first fixing parts 341 can be the same or different. For example, the length of the first C-shaped frame 3411 on one of the first outer side walls 303 is greater than the length of the first C-shaped frame 3411 on the other first outer side wall 303, and the number of first fixing holes 3412 on the first C-shaped frame 3411 on one of the first outer side walls 303 is greater than the number of first fixing holes 3412 on the first C-shaped frame 3411 on the other first outer side wall 303.

[0090] In some embodiments of this application, in addition to the first box frame 31 and the second box frame 32, at least two box frames 3 also include a third box frame 36. For example... Figure 3 As shown, the third box frame 36 is located on the side of at least one second box frame 32 away from the first box frame 31. The first open end 301 of the third box frame 36 is provided with a second fixing member 35. The third box frame 36 is connected to the first fixing member 34 of the adjacent second box frame 32 through the second fixing member 35. The second open end 302 of the third box frame 36 is connected to the bottom guard plate 2.

[0091] As can be seen, the battery box can also include three different types of boxes 3, wherein the first box 31 is located on the top layer and is used to connect with the top cover plate 1; the third box 36 is located on the bottom layer and is used to connect with the bottom protective plate 2; at least one second box 32 is located between the first box 31 and the third box 36, which is used to flexibly adjust the accommodation space for the battery cell assembly, thereby meeting the installation and arrangement requirements of different numbers of battery cell assemblies.

[0092] For each box frame 3, as Figure 9 and Figure 10 As shown, in some embodiments of this application, each box frame 3 includes a first side beam 307, a second side beam 308, a third side beam 309, a fourth side beam 3010, and two expansion beams 3011. The first side beam 307, second side beam 308, third side beam 309, and fourth side beam 3010 are sequentially and sequentially connected around the circumference of the box frame 3. The two expansion beams 3011 are located within the space enclosed by the first side beam 307, second side beam 308, third side beam 309, and fourth side beam 3010 and are spaced apart from each other. The two sides of each expansion beam 3011 are respectively connected to the first side beam 307 and the third side beam 309, and the beam wall of each expansion beam 3011 away from the other expansion beam 3011 is in contact with or connected to the beam wall of the adjacent second side beam 308 or fourth side beam 3010 through ribs 3012. See, for example, [link to relevant documentation]. Figure 9 and Figure 10 One of the expansion beams 3011 has a gap 3013 between it and the adjacent fourth side beam 3010.

[0093] The battery cell assembly installed inside the battery pack is typically located between two expansion beams 3011. During charging and discharging, the battery cell assembly expands. The expansion beams 3011 resist this expansion deformation, thereby reducing the direct impact of the cell assembly's deformation force on the frame 3 and lowering the risk of frame 3 deformation. This protects the stability and safety of the battery pack's internal structure. Furthermore, the design of the expansion beams 3011 enhances the overall structural strength and stability of the battery pack, preventing the connectors 5 from loosening or detaching due to cell expansion, further improving the safety of the battery system.

[0094] In some embodiments of this application, the top cover plate 1 and the box frame 3, the two adjacent box frames 3, and the box frame 3 and the bottom protective plate 2 are all sealed connections.

[0095] For example, sealant is used to connect the top cover plate 1 and the box frame 3, between two adjacent box frames 3, and between the box frame 3 and the bottom protective plate 2. The sealing process using sealant is simple, and the resulting high-strength sealing layer effectively prevents liquid leakage and the intrusion of external dust and impurities. Furthermore, the sealant has good adhesion and chemical resistance, providing strong adhesion in complex shapes and irregular structures while withstanding mechanical stress.

[0096] This application also provides a battery system comprising multiple cell assemblies and a battery housing as described in the above embodiments, wherein the cell assemblies are housed within the cavities of at least two frames 3 of the battery housing.

[0097] The battery system provided in this application embodiment uses the aforementioned battery box, so compared with the battery box in the related technology, there is no need to prepare an additional box frame, which reduces the weight and cost of the battery box; it also does not need to consider the assembly gap of each part on the vehicle, but can be directly installed on the vehicle as a whole, thereby reducing the assembly difficulty and improving the utilization rate of the vehicle space layout when arranged in the vehicle.

[0098] This application also provides an electrical device, which includes a device body and a battery system as described in the above embodiments. The device body is powered by the battery pack system as described in the above embodiments.

[0099] For example, the electrical device can be an energy storage device (e.g., a household or outdoor energy storage power supply), electronic products, power tools, industrial electrical equipment, new energy vehicles, electric bicycles / scooters, special vehicles and equipment, etc. Taking a new energy vehicle as an example, compared with the battery system in related technologies, the overall weight and cost of the battery system provided in this application embodiment are reduced, thus reducing the overall vehicle manufacturing cost; moreover, since the battery system is assembled as a whole onto the vehicle, there is no need to consider the assembly gaps of the various parts of the battery box on the vehicle during assembly, thus reducing the assembly difficulty on the vehicle and improving the utilization rate of the vehicle's space layout.

[0100] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., 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.

[0101] The above description is only for the purpose of enabling those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery case characterized by comprising: The battery box includes a top cover (1), a bottom protective plate (2), and at least two box frames (3); The at least two box frames (3) are stacked and connected in sequence along the height direction. Each box frame (3) has an inner cavity and is open at both ends opposite to each other along the height direction, so that the inner cavities of the at least two box frames (3) are interconnected. The top cover plate (1) and the bottom cover plate (2) are respectively connected to the two ends of the at least two box frames (3) that are furthest apart in the height direction, thereby enclosing the battery box.

2. The battery pack of claim 1, wherein The at least two box frames (3) include a first box frame (31) connected to the top cover plate (1) and at least one second box frame (32) located on the side of the first box frame (31) away from the top cover plate (1); The first open end (301) of the first box frame (31) is provided with a hanging member (33), and the second open end (302) of the first box frame (31) is provided with a first fixing member (34); The second box frame (32) has a second fastener (35) at its first open end (301) and a first fastener (34) at its second open end (302); The first open end (301) and the second open end (302) are the two opposite ends of the box frame (3) along the height direction, and the first open end (301) is closer to the top cover plate (1) than the second open end (302).

3. The battery pack of claim 2, wherein, The box frame (3) has two first outer side walls (303) opposite each other along a first direction and two second outer side walls (304) opposite each other along a second direction. One of the first direction and the second direction is parallel to the length direction of the box frame (3), and the other of the first direction and the second direction is parallel to the width direction of the box frame (3). The first fixing member (34) includes at least one of a first fixing part (341) and a second fixing part (342), and the second fixing member (35) includes at least one of a third fixing part (351) and a fourth fixing part (352), wherein the first fixing part (341) and the third fixing part (351) are located on the first outer side wall (303) of the box frame (3), and the second fixing part (342) and the fourth fixing part (352) are located on the second outer side wall (304) of the box frame (3); Each of the box frames (3) is connected to the third fixing part (351) of the adjacent box frame (3) through the first fixing part (341), and is connected to the fourth fixing part (352) of the adjacent box frame (3) through the second fixing part (342).

4. The battery pack of claim 3, wherein The first fixing part (341) includes a first U-shaped frame (3411), the opening side of the first U-shaped frame (3411) is connected to the first outer side wall (303), and a first fixing hole (3412) is provided through the first U-shaped frame (3411) along the height direction. The third fixing part (351) includes a second C-shaped frame (3511), the opening side of the second C-shaped frame (3511) is connected to the first outer side wall (303), and a second fixing hole (3512) is provided through the second C-shaped frame (3511) along the height direction. The battery housing also includes a first fastener (4), which is inserted into a first fixing hole (3412) of one of the housing frames (3) and a second fixing hole (3512) of the other housing frame (3).

5. The battery pack of claim 4, wherein, The first fixing part (341) further includes a first support plate (3413), one side of the first support plate (3413) is connected to the first shaped frame (3411) and is located between the first fixing hole (3412) and the first outer side wall (303), and the other side of the first support plate (3413) is connected to the first outer side wall (303) and is spaced apart from the first shaped frame (3411); And / or, The third fixing part (351) further includes a second support plate (3513), one side of which is connected to the second C-shaped frame (3511) and located between the second fixing hole (3512) and the first outer side wall (303). The other side of the second support plate (3513) is connected to the first outer side wall (303) and spaced apart from the second C-shaped frame (3511).

6. The battery pack of claim 5, wherein, At least a portion of the surface of the first C-shaped frame (3411) away from the first support plate (3413) is coplanar with the end face of the second open end (302) where the first fixing part (341) is located; At least a portion of the surface of the second C-shaped frame (3511) away from the second support plate (3513) is coplanar with the end face of the first open end (301) where the third fixing part (351) is located.

7. The battery pack of any of claims 4-6, wherein, At least one of the first zigzag frame (3411) of the box frame (3) is also provided with a positioning hole (3414), the positioning hole (3414) penetrates the first zigzag frame (3411) along the height direction, and the positioning hole (3414) is spaced apart from the first fixing hole (3412); At least one of the box frames (3) has a positioning pin (3514) extending along the height direction on the second C-shaped frame (3511). The positioning pin (3514) is spaced apart from the second fixing hole (3512) and can pass through the positioning hole (3414).

8. The battery pack of claim 3, wherein, The second fixing part (342) includes a third fixing hole (3421) provided on the second outer side wall (304), and the fourth fixing part (352) includes a fourth fixing hole (3521) provided on the second outer side wall (304); The battery housing also includes a connector (5), a second fastener (6), and a third fastener (7). The connector (5) is provided with a fifth fixing hole (51) and a sixth fixing hole (52). The second fastener (6) is inserted into the fifth fixing hole (51) and the third fixing hole (3421), and the third fastener (7) is inserted into the sixth fixing hole (52) and the fourth fixing hole (3521).

9. The battery pack of claim 8, wherein, The second outer sidewall (304) is provided with a first groove (305) and a second groove (306) spaced apart along the height direction, and the sides of the first groove (305) and the second groove (306) that are far apart from each other extend to the end face of the first open end (301) and the end face of the second open end (302), respectively. The third fixing hole (3421) is located on the bottom wall of the first groove (305), and the fourth fixing hole (3521) is located on the bottom wall of the second groove (306). A portion of the connector (5) and at least a portion of the second fastener (6) are accommodated inside the first groove (305), and another portion of the connector (5) and at least a portion of the third fastener (7) are accommodated inside the second groove (306).

10. The battery pack of claim 2, wherein, The hanging component (33) includes at least one of a lifting part (331) and a mounting part (332). The lifting part (331) is used to lift the battery box, and the mounting part (332) is used to install the battery box onto a carrier.

11. The battery pack of claim 2, wherein, The at least two box frames (3) further include a third box frame (36), which is located on the side of the at least one second box frame (32) away from the first box frame (31); The third box frame (36) is provided with the second fixing member (35) at its first open end (301). The third box frame (36) is connected to the first fixing member (34) of the adjacent second box frame (32) through the second fixing member (35). The second open end (302) of the third box frame (36) is connected to the bottom guard plate (2).

12. The battery pack of claim 1, wherein, Each of the box frames (3) includes a first side beam (307), a second side beam (308), a third side beam (309), a fourth side beam (3010), and two expansion beams (3011); The first side beam (307), the second side beam (308), the third side beam (309) and the fourth side beam (3010) are sequentially closed and connected along the circumference of the box frame (3); The two expansion beams (3011) are located within the space enclosed by the first side beam (307), the second side beam (308), the third side beam (309), and the fourth side beam (3010) and are spaced apart from each other. The two sides of each expansion beam (3011) are respectively connected to the first side beam (307) and the third side beam (309), and the beam wall of each expansion beam (3011) away from the other expansion beam (3011) is in contact with or connected to the beam wall of the adjacent second side beam (308) or fourth side beam (3010) through ribs (3012).

13. The battery pack of claim 1, wherein, The top cover plate (1) and the box frame (3), the two adjacent box frames (3), and the box frame (3) and the bottom guard plate (2) are all sealed connections.

14. A battery system characterized by, The battery system includes a plurality of cell assemblies and a battery housing as described in any one of claims 1-13, wherein the cell assemblies are housed in the cavities of at least two frames (3) of the battery housing.

15. An electrical appliance, characterized in that, The electrical equipment includes a device body and the battery system of claim 14, wherein the device body is powered by the battery system.

Images