Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a plurality of battery cells; the bottom surface of the inner side of the box body is provided with a step surface, so that the bottom surface of the inner side of the box body is divided into at least two placement areas with a height difference in the height direction of the box body, and the battery cells are placed on each placement area. According to the battery pack provided by the invention, the step surface is arranged on the bottom surface of the inner side of the box body, so that at least two placement areas with height difference can be formed in the box body, acting force can be provided for glue in the placement area with higher height, and the glue is helped to flow to the placement area with lower height. According to the present invention, the fluidity of the glue in the box body can be easily improved, such that each region of the box body can be easily filled with the glue, the surface of the glue in the box body can easily form the flat surface, the plurality of battery cells in different regions in the box body can be easily immersed by the glue, and the subsequent assembly work of the battery pack can be easily achieved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more particularly to a battery pack. Background Art

[0002] In related technologies, existing battery packs include existing housings and multiple battery cells installed within the existing housings. After the battery cells are assembled within the existing housings, adhesive is applied from the top of the existing battery pack to immerse and encapsulate the battery cells within the existing housings.

[0003] However, the adhesive has poor flowability inside the casing, which may result in the adhesive not being able to completely submerge all the battery cells inside the existing casing.

[0004] Therefore, improving the flowability of the adhesive within the box has become an urgent problem to be solved. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery pack.

[0006] For the purposes described above, this application provides a battery pack, comprising: a plurality of battery cells; a housing, wherein the inner bottom surface of the housing has a stepped surface to divide the inner bottom surface of the housing into at least two placement areas having a height difference in the height direction of the housing, and each placement area is provided with a battery cell.

[0007] Optionally, the housing includes a bottom plate and a support member. The bottom plate has an inner accommodating space, and the support member is disposed within the accommodating space. The side of the support member away from the bottom plate forms the inner bottom surface of the housing.

[0008] Optionally, the carrier and the base plate are spaced apart to define an exhaust channel between the base plate and the carrier; the battery cell has an explosion-proof valve facing the inner bottom surface of the housing; the inner bottom surface of the housing is provided with an exhaust hole corresponding to the explosion-proof valve, the exhaust hole penetrates the carrier and communicates with the exhaust channel, so that the gas discharged by the explosion-proof valve can enter the exhaust channel through the exhaust hole.

[0009] Optionally, the support member includes at least two support sub-plates, and the surface of each support sub-plate away from the base plate is configured as a placement area; along a first direction, at least one partition is provided between each support sub-plate and the base plate, and the partition divides the exhaust channel into at least two exhaust sub-channels, with two adjacent exhaust sub-channels connected end to end in sequence; the first direction is perpendicular to the surface of the support sub-plate.

[0010] Optionally, the partition has a suspended end, and an exhaust port is defined between the suspended end of the partition and the inner sidewall of the adjacent housing, and / or, an exhaust port is defined between the suspended end of the partition and the adjacent support member, and the adjacent exhaust sub-channels are connected through the exhaust port.

[0011] Optionally, along the second direction, the number of partitions under each of the supporting sub-plates increases sequentially; the second direction is the direction in which the height of the placement area increases.

[0012] Optionally, along the first direction, the partition adjacent to the bearing sub-plate is defined as the first partition; along the second direction, the lower surface of the bearing sub-plate is not higher than the upper surface of the first partition of the front adjacent bearing sub-plate.

[0013] Optionally, along the second direction, the lower surface of the supporting sub-plate is flush with the lower surface of the first partition of the front adjacent supporting sub-plate.

[0014] Optionally, along the first direction, the orthographic projection of the partition plate onto the corresponding support subplate at least covers the vent holes disposed on the support subplate.

[0015] Optionally, the partition is connected to the inner wall of the support member and / or the housing.

[0016] Optionally, each placement area is provided with an encapsulation layer covering the battery cell, and the thickness of the encapsulation layer corresponding to each placement area increases sequentially in the opposite direction of the second direction; the second direction is the direction in which the height of the placement area increases.

[0017] Optionally, the encapsulation layer has a top surface that is away from the inner bottom surface of the housing, and the top surface of the encapsulation layer is flush with at least a portion of the placement area.

[0018] As can be seen from the above, the battery pack provided in this application has a stepped surface on the inner bottom side of the casing, which can form at least two placement areas with a height difference inside the casing. This provides force to the adhesive in the higher placement area, helping the adhesive flow to the lower placement area. This helps improve the fluidity of the adhesive inside the casing, making it easier for the adhesive to fully fill all areas of the casing. It also helps to form a flatter adhesive surface inside the casing, making it easier for multiple cells in different areas of the casing to be immersed in the adhesive. This also facilitates the subsequent assembly of the battery pack. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial three-dimensional structural schematic diagram of the battery pack according to an embodiment of this application;

[0021] Figure 2 This is a partial top view of the battery pack according to an embodiment of this application;

[0022] Figure 3 This is a perspective view of the battery pack housing according to an embodiment of this application;

[0023] Figure 4 for Figure 2 Schematic diagram of the cross section AA;

[0024] Figure 5 for Figure 2 A cross-sectional view of section AA after the battery cell has been removed;

[0025] Figure 6 for Figure 5 An enlarged schematic diagram of part B in the diagram;

[0026] Figure 7 for Figure 5 An enlarged schematic diagram of part C in the diagram;

[0027] Figure 8 for Figure 5 An enlarged schematic diagram of part D in the diagram.

[0028] Description of reference numerals:

[0029] 100. Enclosure; 10. Inner bottom surface; 11. Placement area; 20. Base plate; 30. Storage space; 40. Side plate; 41. Enclosure explosion-proof valve; 42. Inner wall; 43. Cavity;

[0030] 200. Battery cell busbar; 210. Battery cell; 211. Battery cell explosion-proof valve;

[0031] 300, Supporting component; 310, Vent hole; 320, Supporting sub-plate; 320a, First supporting sub-plate; 320b, Second supporting sub-plate; 330, Connecting part;

[0032] 400, Exhaust passage; 410, Exhaust sub-passage; 410a, First exhaust sub-passage; 410b, Second exhaust sub-passage; 410c, Third exhaust sub-passage; 420, Exhaust connection port;

[0033] 500, partition; 510, first partition; 520, suspended end;

[0034] 600, Encapsulation layer; 610, Top surface. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0036] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0037] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0038] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] like Figure 1 As shown, Figure 1 A partial three-dimensional structural schematic diagram of the battery pack is shown. The battery pack may include a housing 100, which may include a base plate 20 and four side plates 40 connected to the edge of the base plate 20. The base plate 20 and the four side plates 40 together define an accommodating space 30 located inside the housing 100. At least one side plate 40 of the housing 100 is equipped with a housing explosion-proof valve 41. Exemplarily, along the width direction of the housing (e.g. Figure 1 The side panel 40 (in the X direction) is equipped with a housing explosion-proof valve 41. The battery pack also includes multiple battery cells 210 installed in the housing space 30, and the battery cells 210 can be cylindrical battery cells 210.

[0041] like Figure 2 As shown, Figure 2 A top view showing a partial structural section of the battery pack is displayed. Figure 2 Taking the structure shown as an example, multiple battery cells 210 can be formed into multiple battery cell rows 200, with the multiple battery cell rows 200 extending along the width direction of the housing 100 (e.g., ...). Figure 2 The cells are distributed along the X-direction of the housing 100. Each cell array 200 includes cells distributed along the length direction of the housing 100 (e.g., in the X direction). Figure 2 Multiple battery cells 210 are distributed in the Y direction (in the middle). To improve the space utilization of the housing space 30, adjacent battery cell rows 200 can be staggered.

[0042] In some embodiments, a horizontal support plane is provided in the receiving space 30 of the housing 100. Exemplarily, this support plane is formed by the inner side of the base plate 20 of the housing 100, or by the surface of a structural member mounted in the receiving space 30 of the housing 100. Multiple battery cells 210 are placed on this support plane within the receiving space 30. During potting from the top of the battery pack into the housing 100, the adhesive (e.g., potting compound) flows downwards to the support plane, then flows in all directions along the support plane to fill the receiving space 30 until all the battery cells 210 within the receiving space 30 are submerged.

[0043] However, the applicant discovered that the adhesive itself is quite viscous. When flowing along a horizontal supporting plane, the supporting plane cannot provide the adhesive with the force to assist its flow. This makes it easy for the adhesive to stagnate during the flow process, resulting in adhesive accumulation in some areas of the containment space, where the adhesive surface height is high; while other areas lack adhesive, where the adhesive surface height is low. In other words, it is not easy to form a relatively flat horizontal surface for the adhesive in the box. When the adhesive surface height is uneven, it is not easy to ensure that multiple cells in different areas of the box are completely submerged, and it can also adversely affect the subsequent assembly of the battery pack.

[0044] In view of this, such as Figure 1 As shown, this application embodiment provides a battery pack, which includes a housing 100 and multiple battery cells 210. For example... Figure 3 As shown, Figure 3 A perspective view of the box 100 is shown. The inner bottom surface 10 of the box 100 has a stepped surface to divide the inner bottom surface 10 of the box 100 into at least two sections in the height direction of the box 100 (e.g., ...). Figure 3 Placement areas 11 with height differences in the Z direction (in the middle), each placement area 11 has a battery cell 210 placed on it.

[0045] For example, the battery cell 210 in this embodiment can be a cylindrical battery cell or a prismatic battery cell.

[0046] For example, the stepped surface of the inner bottom surface 10 of the housing 100 may be constructed from a base plate 20 of uneven thickness, or from a structural member of uneven thickness (e.g., a plate-shaped structural member or a block-shaped structural member) installed inside the housing 100, or from a plate-shaped structural member of uniform thickness and stepped shape installed inside the housing 100.

[0047] For example, the height of the placement area 11 can increase sequentially in a single direction, such as increasing sequentially from one side to the other along the width direction of the box 100; or, the height of the placement area 11 can increase sequentially in two opposite directions, such as increasing sequentially from the middle of the box 100 to both sides along the width direction of the box 100; or, the height of the placement area 11 can increase sequentially from the middle of the box 100 along both the width and length directions of the box 100 towards the edge.

[0048] For example, the surface area of ​​the placement area 11 can be the same or different, and the surface shape of the placement area 11 can be the same or different.

[0049] For example, the height difference between any two adjacent placement areas 11 can be equal or unequal.

[0050] The inner bottom surface 10 of the housing 100 has a stepped surface, allowing for adhesive pouring from the highest placement area 11. As the adhesive flows from the highest placement area 11 to the next lower placement area 11, the height difference between the two areas allows the adhesive's gravitational potential energy to be converted into kinetic energy, promoting its flow. Simultaneously, even if adhesive is already present on the surfaces of each placement area 11, as long as a height difference remains, it can still assist the flow of subsequent adhesive poured into the housing 100 until a relatively flat surface is formed inside the housing 100.

[0051] The battery pack provided in this application embodiment has a stepped surface on the inner bottom surface 10 of the housing 100, which can form at least two placement areas 11 with a height difference within the housing 100. This provides force to the adhesive located in the higher placement area 11, helping the adhesive flow to the lower placement area 11. This helps improve the fluidity of the adhesive within the housing 100, making it easier for the adhesive to fully fill each area of ​​the housing 100. It also helps to form a flatter adhesive surface inside the housing 100, making it easier for multiple cells 210 in different areas of the housing 100 to be immersed in the adhesive. This also facilitates the subsequent assembly of the battery pack.

[0052] like Figure 4 As shown, Figure 4 Shown Figure 2A cross-sectional view of section AA. In some embodiments, the box 100 includes a bottom plate 20 and a support member 300. The bottom plate 20 has an inner receiving space 30. The support member 300 is disposed in the receiving space 30. The side of the support member 300 away from the bottom plate 20 is configured as the inner bottom surface 10 of the box 100.

[0053] For example, the support member 300 can be a stepped plate structure with uniform thickness or a stepped block structure with non-uniform thickness.

[0054] For example, the support member 300 may be fixedly connected to or detachably connected to the bottom plate 20 of the housing 100, or the support member 300 may be fixedly connected to or detachably connected to the side plate 40 of the housing 100.

[0055] For example, the carrier 300 and the housing 100 can be fixedly connected by welding, bonding or integral molding, or the carrier 300 and the housing 100 can be detachably connected by snap-fit, plug-in or fastener connection.

[0056] By constructing a stepped surface on the inner bottom surface 10 of the box 100 by means of the surface of the bearing member 300 independent of the bottom plate 20, the bottom plate 20 of the box 100 can maintain a plate-like structure with uniform thickness and small thickness. On the one hand, this helps to simplify the overall structure of the box 100, and on the other hand, it also helps to save the cost of the box 100.

[0057] like Figure 4 As shown, in some embodiments, the support member 300 is spaced apart from the base plate 20 to define an exhaust channel 400 between the base plate 20 and the support member 300; the battery cell 210 has a battery cell explosion-proof valve 211, which faces the inner bottom surface 10 of the housing 100; the inner bottom surface 10 of the housing 100 is provided with an exhaust through hole 310 corresponding to the battery cell explosion-proof valve 211, the exhaust through hole 310 penetrates the support member 300 and communicates with the exhaust channel 400, so that the gas discharged by the battery cell explosion-proof valve 211 can enter the exhaust channel 400 through the exhaust through hole 310.

[0058] For example, the installation position of the explosion-proof valve 41 on the side panel 40 corresponds to the exhaust channel 400. When the explosion-proof valve 41 is opened, the exhaust channel 400 can be connected to the outside of the enclosure 100 through the explosion-proof valve 41.

[0059] For example, the cell explosion-proof valve 211 is located at the bottom of the cell 210.

[0060] For example, the circumferential sidewalls of the carrier 300 are all fitted and connected to the inner sidewall 42 of the housing 100 to improve the sealing between the exhaust channel 400 and the cell placement space.

[0061] For example, the support member 300 can be a plate-like structure with uniform thickness to facilitate the provision of an exhaust hole 310 through the support member 300.

[0062] The carrier 300 can separate the cell placement space in the housing space 30 above the carrier 300 for accommodating the cell 210 from the exhaust channel 400 below the carrier 300. This can prevent gas in the exhaust channel 400 from entering the cell placement space to a certain extent, and reduce the adverse effects of the gas discharged from the cell explosion-proof valve 211 on other cells 210.

[0063] The applicant's research found that after thermal runaway occurs in cell 210 (especially cylindrical cells), cell 210 experiences significant weight loss (more than 80% of its original weight). The reason for this significant weight loss is that during thermal runaway, the gas discharged from the cell explosion-proof valve 211 carries a large amount of solid particulate matter. This gas, carrying particulate matter, flows through the exhaust channel 400 towards the enclosure explosion-proof valve 41. While the gas can pass through the enclosure explosion-proof valve 41 and exit the enclosure 100, at least some of the particulate matter cannot pass through. This particulate matter can easily clog the enclosure explosion-proof valve 41, preventing subsequent gas from exiting the enclosure 100, posing a risk of thermal diffusion and fire within the battery pack.

[0064] In some embodiments, a screen is provided in the exhaust channel 400 to intercept particulate matter carried in the flowing gas.

[0065] A screen can intercept particulate matter in the gas before it reaches the explosion-proof valve 41 in the enclosure, reducing the risk of particulate matter clogging the valve to some extent. However, if the screen intercepts a large amount of particulate matter, there is a risk that the mesh of the screen may become blocked by the particulate matter, which would also have a serious adverse effect on the gas flow in the exhaust channel 400.

[0066] In view of this, if Figure 5 As shown, Figure 5 Shown Figure 2 A cross-sectional view of section AA after removing cell 210. In some embodiments, the carrier 300 includes at least two carrier sub-plates 320, and the plate surface of each carrier sub-plate 320 away from the base plate 20 is configured as a placement area 11; along a first direction (e.g. Figure 5 In the Z direction), at least one partition 500 is provided between each load-bearing sub-plate 320 and the base plate 20. Figure 6 , Figure 6 for Figure 5Enlarged schematic diagram of part B. The partition 500 divides the exhaust channel 400 into at least two exhaust sub-channels 410, and two adjacent exhaust sub-channels 410 are connected end to end in sequence; the first direction is perpendicular to the surface of the supporting sub-plate 320.

[0067] For example, along the first direction, at least two layers of partitions 500 are provided below each carrier sub-plate 320. In this way, even if the partition 500 closest to the carrier sub-plate 320 is damaged (for example, the partition 500 is punctured by the gas ejected from the cell explosion-proof valve 211), the partition 500 located below the damaged partition 500 can still function to separate the exhaust passage 400.

[0068] For example, a connecting portion 330 is provided between two adjacent support sub-plates 320, and the connecting portion 330 is fixedly connected to the two support sub-plates 320 respectively. The connecting portion 330 can be used to construct a continuous plate-like structure between two adjacent support sub-plates 320.

[0069] For example, the connecting part 330 and the supporting subplate 320 can be fixedly connected by welding or integral molding.

[0070] For example, such as Figure 6 The connecting part 330 can be a plate-shaped structure, and the angle d between the plate surface of the connecting part 330 and the plate surface of the supporting sub-plate 320 is greater than or equal to 90°.

[0071] Along the first direction, the partition 500 divides the exhaust passage 400 into at least two exhaust sub-passages 410. The two adjacent exhaust sub-passages 410 are connected end to end in sequence, so the direction of gas flow will change at the position where the two adjacent exhaust sub-passages 410 are connected.

[0072] Specifically, with Figure 6 Taking the structure and direction of the gas flow as an example, the dashed arrows in the diagram represent the gas flow path. In the first exhaust sub-channel 410a, the gas flows from right to left. When the gas reaches the connection point between the upper first exhaust sub-channel 410a and the lower second exhaust sub-channel 410b, the gas changes direction, flowing from left to right into the second exhaust sub-channel 410b and continuing towards the explosion-proof valve 41. Understandably, when the gas flow direction changes, the gas velocity decreases, and the gas's ability to carry particulate matter decreases accordingly. Therefore, particulate matter will deposit at the location where the gas flow direction changes, i.e., gas-solid separation occurs. Thus, the amount of particulate matter carried by the gas flowing into the second exhaust sub-channel 410b is reduced, helping to reduce the risk of the explosion-proof valve 41 being blocked by particulate matter.

[0073] like Figure 7 As shown, Figure 7 Shown Figure 5 Enlarged schematic diagram of part C. In some embodiments, the partition 500 has a suspended end 520, and an exhaust port 420 is defined between the suspended end 520 of the partition 500 and the inner sidewall 42 of the adjacent housing 100, and the adjacent exhaust sub-channel 410 is connected through the exhaust port 420.

[0074] And / or, such as Figure 6 As shown, an exhaust port 420 is defined between the suspended end 520 of the partition 500 and the adjacent support member 300, and the adjacent exhaust sub-channel 410 is connected through the exhaust port 420.

[0075] For example, in the circumferential direction of the partition 500, the end of the partition 500 that is not connected to other structural members is defined as the suspended end 520.

[0076] For example, the inner wall 42 of the housing 100 is the side panel 40 facing the receiving space 30.

[0077] The partition 500 is spaced from the inner sidewall 42 of the housing 100 to form an exhaust port 420, or the partition 500 and the support member 300 are spaced apart to form an exhaust port 420, such that the exhaust port 420 corresponds to the entire edge of the suspended end 520 of the partition 500. This allows for a larger opening area of ​​the exhaust port 420, further reducing the risk of the exhaust port 420 being blocked by deposited particles. Furthermore, compared to forming the exhaust port 420 by removing material from the partition 500, the method used in this embodiment simplifies the internal structure of the housing 100, reducing processing difficulty and the cost of the housing 100.

[0078] like Figure 5 In some embodiments, along the second direction (e.g.) Figure 5 In the X direction, the number of partitions 500 below each bearing sub-plate 320 increases sequentially; the second direction is the direction in which the height of the placement area 11 increases.

[0079] For example, both side panels 40 of the enclosure 100 along the second direction are equipped with enclosure explosion-proof valves 41.

[0080] For example, the side panel 40 of the enclosure 100 has a cavity 43 inside, and the enclosure explosion-proof valve 41 extends into the cavity 43. The inner side wall 42 of the enclosure 100 has a through hole, and at least the bottom exhaust sub-channel 410 is connected to the cavity 43 through the through hole along the height direction of the enclosure 100.

[0081] Since the multiple supporting sub-plates 320 have the same thickness, as the height of the placement area 11 increases, the cross-sectional height of the exhaust channel 400 between the supporting sub-plates 320 and the bottom plate 20 of the enclosure 100 also increases accordingly. Therefore, by increasing the number of partitions 500, the exhaust channel 400 can be divided into more exhaust sub-channels 410, and the number of exhaust connection ports 420 will also increase accordingly. When gas flows through more exhaust connection ports 420, the amount of deposited particles will also be greater, thus further reducing the risk of the enclosure explosion-proof valve 41 being blocked.

[0082] like Figure 6 As shown, in some embodiments, along the first direction (e.g.) Figure 6 In the Z direction), the partition 500 adjacent to the bearing sub-plate 320 is defined as the first partition 510; along the second direction (e.g., Figure 6 In the X direction, the lower surface of the bearing sub-plate 320 is not higher than the upper surface of the first partition 510 of the adjacent bearing sub-plate 320 on the front side.

[0083] by Figure 6 Taking the structure and orientation shown in the figure as an example for further explanation, along the second direction, the second bearing sub-plate 320b is located in front of the first bearing sub-plate 320a, and the height of the second bearing sub-plate 320b is higher than the height of the first bearing sub-plate 320a.

[0084] Gas enters the third exhaust sub-channel 410c through the exhaust port 310 of the first support sub-plate 320a and flows from left to right. When the gas flows to the exhaust port 420, since the upper surface of the first partition 510 corresponding to the second support sub-plate 320b is higher than the lower surface of the first support sub-plate 320a, the first exhaust sub-channel 410a is higher than the third exhaust sub-channel 410c. This prevents gas from flowing upward into the first exhaust sub-channel 410a and avoids adverse effects on the battery cell 210 on the higher-positioned second support sub-plate 320b, thus helping to prevent heat diffusion. After passing through the exhaust port 420, the gas flows downward into the second exhaust sub-channel 410b and is then discharged outside the enclosure 100 through the enclosure explosion-proof valve 41 near the bottom plate 20 of the enclosure 100.

[0085] like Figure 6 As shown, in some embodiments, along the second direction, the lower surface of the support sub-plate 320 is flush with the lower surface of the first partition 510 of the front adjacent support sub-plate 320.

[0086] Still with Figure 6Taking the structure and orientation shown in the figure as an example for further explanation, when the lower surface of the first partition 510 corresponding to the second bearing sub-plate 320b is flush with the lower surface of the first bearing sub-plate 320a, on the one hand, the spacing between the first exhaust sub-channel 410a and the third exhaust sub-channel 410c along the first direction can be increased, further preventing the gas flowing out of the third exhaust sub-channel 410c from entering the first exhaust sub-channel 410a; on the other hand, the third exhaust sub-channel 410c and the second exhaust sub-channel 410b can be aligned, which helps the gas flowing out of the third exhaust sub-channel 410c to quickly and smoothly enter the second exhaust sub-channel 410b, and then be discharged to the outside of the box 100 through the box explosion-proof valve 41 near the bottom plate 20 of the box 100.

[0087] like Figure 8 As shown, Figure 8 Shown Figure 5 An enlarged schematic diagram of part D in some embodiments, along the first direction (e.g. Figure 8 In the Z direction), the orthogonal projection of the partition 500 onto the corresponding support sub-plate 320 at least covers the exhaust hole 310 provided on the support sub-plate 320.

[0088] For example, the vent hole 310 of the carrier sub-board 320 and the cell explosion-proof valve 211 of the cell 210 placed on the carrier sub-board 320 correspond one-to-one.

[0089] The partition 500 covers all the exhaust holes 310 on the corresponding support sub-plate 320, which can ensure that after the gas passes through any exhaust hole 310 on the support sub-plate 320, it will enter the exhaust sub-channel 410 under the action of the partition 500, and achieve gas-solid separation during the process of the gas flowing through the exhaust sub-channel 410 to the explosion-proof valve 41 of the box, thereby reducing the risk of gas-carried particles clogging the explosion-proof valve 41 of the box.

[0090] like Figure 8 The partition 500 is connected to the inner wall of the support 300 and / or the housing 100.

[0091] For example, when the partition 500 is connected to the carrier 300, the partition 500 can be connected to the connecting portion 330 of the carrier 300.

[0092] For example, along the second direction (such as...) Figure 8 In the X direction), one side of the connecting part 330 can be connected to the bearing sub-plate 320, and the other side can be connected to the partition plate 500, and the lower plate surface of the bearing sub-plate 320 and the lower plate surface of the partition plate 500 are flush.

[0093] For example, when the partition 500 is connected to the housing 100, the partition 500 can be connected to the inner side wall 42 of the side panel 40 of the housing 100.

[0094] For example, the partition 500 can be connected to the inner wall of the box 100 or to the load-bearing component 300 by means of welding, bonding, plugging, snapping or integral molding.

[0095] Using the inner sidewall of the carrier 300 and / or the housing 100 as the basic structure for the fixed connection of the separator 500 can improve the overall integration of the battery pack and reduce the assembly difficulty. On the other hand, it can also save the need to design a separate fixing structure for the separator 500, which helps to simplify the internal structure of the housing 100 and reduce the cost of the housing 100.

[0096] like Figure 4 As shown, in some embodiments, each placement area 11 is provided with an encapsulation layer 600 covering the battery cell 210, along the second direction (e.g., Figure 4 The thickness of the encapsulation layer 600 corresponding to each placement area 11 increases sequentially in the opposite direction of the X direction; the second direction is the direction in which the height of the placement area 11 increases.

[0097] For example, the encapsulation layer 600 may be formed by curing a foaming agent.

[0098] by Figure 4 Taking the structure and orientation shown as an example for further explanation, along the reverse of the second direction, that is, from right to left, the height of the support sub-plate 320 decreases sequentially, and correspondingly, the top height of the battery cell 210 placed on the support sub-plate 320 also decreases sequentially. Along the height direction of the housing 100 (e.g....) Figure 4 In the Z direction, the lower the top height of the cell 210, the greater the straight-line distance between the top of the cell 210 and the top opening of the housing 100, and the greater the space for setting the encapsulation layer 600.

[0099] The encapsulation layer 600 covering the top of the battery cell 210 can encapsulate the battery cell 210, helping to prevent venting from the top of the battery cell 210 (in the event of thermal runaway) and reducing the risk of external short circuits. The greater the thickness of the encapsulation layer 600, the better its encapsulation effect on the battery cell 210.

[0100] like Figure 4 As shown, in some embodiments, the encapsulation layer 600 has a top surface 610, which is located away from the inner bottom surface 10 of the housing 100, and the top surface 610 of the encapsulation layer 600 corresponding to at least a portion of the placement area 11 is flush with the housing 100. Preferably, the top surfaces 610 of all encapsulation layers 600 are flush to form a plane.

[0101] For example, the top surface 610 of the encapsulation layer 600 is parallel to the plane containing the top opening of the housing 100.

[0102] Before the encapsulation layer 600 cures, it is a flowable adhesive. The inner bottom surface 10 of the housing 100 is stepped, which can improve the flowability of the adhesive within the housing 100. When the surface of the adhesive is not flat, the adhesive located at a higher position will continuously flow to a lower position under the effect of the height difference formed by the step surface. When the adhesive stops flowing, the surface of the adhesive can form a flat surface.

[0103] At this point, as long as the thickness of the encapsulation layer 600 covering the top of the tallest cell 210 meets the process requirements, the thickness of the encapsulation layer 600 covering the top of the other cells 210 in the housing 100 will only be thicker, ensuring that the encapsulation layer 600 can effectively encapsulate all the cells 210 within the housing 100. This also helps ensure the smooth progress of subsequent battery pack assembly.

[0104] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0105] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0106] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0107] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0108] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0109] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that: include: Multiple cells; The box body has an inner bottom surface with a step surface, so as to divide the inner bottom surface of the box body into at least two placement areas with a height difference in the height direction of the box body, and the battery cell is placed on each of the placement areas.

2. The battery pack according to claim 1, characterized in that: The box body comprises a bottom plate and a bearing member, the inner side of the bottom plate has a receiving space, the bearing member is arranged in the receiving space, and a side surface of the bearing member away from the bottom plate is configured as an inner bottom surface of the box body.

3. The battery pack according to claim 2, characterized in that: The carrier is spaced apart from the bottom plate to define an exhaust channel between the bottom plate and the carrier; the battery cell has a battery cell explosion-proof valve, and the battery cell explosion-proof valve faces the inner bottom surface of the box body; the inner bottom surface of the box body is provided with an exhaust through hole corresponding to the battery cell explosion-proof valve, and the exhaust through hole passes through the carrier and is connected with the exhaust channel, so that the gas discharged from the battery cell explosion-proof valve can enter the exhaust channel through the exhaust through hole.

4. The battery pack according to claim 3, characterized in that: The carrier comprises at least two carrier sub-plates, and a plate surface of each carrier sub-plate away from the bottom plate is configured as a placement area; Along the first direction, at least one partition is arranged between each of the bearing sub-plates and the bottom plate, and the partition divides the exhaust channel into at least two exhaust sub-channels, and two adjacent exhaust sub-channels are connected end to end in sequence; the first direction is perpendicular to the plate surface of the bearing sub-plate.

5. The battery pack according to claim 4, characterized in that: The partition has a suspended end, and an exhaust connection port is defined between the suspended end of the partition and the inner side wall of the box body adjacent thereto, and / or, an exhaust connection port is defined between the suspended end of the partition and the supporting member adjacent thereto, and adjacent exhaust sub-channels are connected through the exhaust connection port.

6. The battery pack according to claim 4, characterized in that: Along the second direction, the number of the partitions under each of the carrying sub-plates increases sequentially; the second direction is the direction in which the height of the placement area increases gradually.

7. The battery pack according to claim 6, characterized in that: Along the first direction, the partition adjacent to the carrying sub-board is defined as a first partition; along the second direction, the lower surface of the carrying sub-board is not higher than the upper surface of the first partition of the carrying sub-board adjacent to the front side.

8. The battery pack according to claim 7, characterized in that: Along the second direction, the lower surface of the carrying sub-plate is flush with the lower surface of the first partition plate of the carrying sub-plate adjacent to the front side.

9. The battery pack according to claim 4, characterized in that: Along the first direction, the orthographic projection of the partition on the corresponding carrying sub-plate at least covers the exhaust through-holes arranged on the carrying sub-plate.

10. The battery pack according to claim 4, characterized in that: The partition is connected to the supporting member and / or the inner side wall of the box body.

11. The battery pack according to claim 1, characterized in that: A packaging layer covering the battery cell is arranged above each placement area, and the thickness of the packaging layer corresponding to each placement area increases successively in the opposite direction of the second direction; the second direction is the direction in which the height of the placement area increases gradually.

12. The battery pack according to claim 11, characterized in that: The packaging layer has a top surface, the top surface of the packaging layer is away from the inner bottom surface of the box body, and at least a portion of the placement area corresponding to the top surface of the packaging layer is flush.

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