Battery pack

Abstract

The utility model provides a battery pack, which comprises: a box body, in which an exhaust passage is arranged; the plurality of battery cells are arranged in the box body, and gas exhausted by the battery cells is suitable for being exhausted out of the box body through the exhaust channel; the guide structure is arranged in the exhaust channel and is close to the battery cell; the guide structure is provided with a guide surface, and the guide surface is used for guiding gas which is discharged from the battery cell and enters the exhaust channel. According to the battery pack provided by the invention, the guide structure is arranged in the exhaust channel and close to the battery cell, and when the battery cell is in thermal runaway, the gas sprayed out of the battery cell can be guided in time through the guide surface, so that the flowing direction of the gas in the exhaust channel is changed and limited, and the gas is prevented from flowing to other adjacent normal battery cells to a certain extent; and the risk of thermal runaway induced after the normal battery cell is influenced by the gas can be reduced, and the problem of thermal diffusion of the battery pack can be prevented.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery pack. Background Art

[0002] In the related art, the existing battery pack includes an existing box body and multiple battery cells installed in the existing box body, and each battery cell has a battery cell explosion-proof valve. When the battery cell has thermal runaway, the battery cell explosion-proof valve will spray gas outward. However, if the direction of the sprayed gas is not controlled, it may induce thermal runaway of other normal battery cells, thereby causing heat diffusion problems in the battery pack.

[0003] Therefore, how to guide the gas ejected from the battery cell explosion-proof valve has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery pack.

[0005] Based on the above-mentioned purpose, the present application provides a battery pack, including: a box body, the box body having an exhaust channel; a plurality of battery cells, the plurality of battery cells are arranged in the box body, and the gas discharged from the battery cells is suitable for being discharged to the outside of the box through the exhaust channel; a guide structure, the guide structure is arranged in the exhaust channel and is close to the battery cells; the guide structure has a guide surface, and the guide surface is used to guide the gas discharged from the battery cells and entering the exhaust channel.

[0006] Optionally, the box body has a box explosion-proof valve, the battery cell has a battery cell explosion-proof valve, the gas is suitable for flowing out of the battery cell explosion-proof valve and flowing through the exhaust channel and then discharged from the box body from the box explosion-proof valve, and the flow path of the gas flowing from the battery cell explosion-proof valve to the box explosion-proof valve is defined as a first flow path; the side wall surface of the guide structure facing the box explosion-proof valve is configured as the guide surface, and along the first flow path, the guide surface is inclined toward the downstream of the gas.

[0007] Optionally, a plurality of guide structures are provided, and guide surfaces of at least two of the plurality of guide structures have different inclination angles.

[0008] Optionally, the surface where the battery cell explosion-proof valve is located is defined as the first battery cell end face; the angle between the guide surface and the first battery cell end face is defined as the inclination angle of the guide surface; along the first flow path, the inclination angles of the multiple guide surfaces of the multiple guide structures decrease successively.

[0009] Optionally, a plurality of the battery cells are arranged along the first flow path to form at least one battery cell row; in the same battery cell row, the battery cells and the guide structures correspond one to one; and along the first flow path, an absolute value Δa of a difference in inclination angles of the guide surfaces of two adjacent guide structures is:

[0010] Δa=(90 / n)°

[0011] Wherein, n is the number of the battery cells in the same battery cell row.

[0012] Optionally, the battery cell explosion-proof valve faces the inner bottom surface of the box body, and the inner bottom surface of the box body is spaced apart from the battery cell explosion-proof valve to define the exhaust channel between the battery cell explosion-proof valve and the inner bottom surface of the box body, and the guide structure is spaced apart from the inner bottom surface of the box body.

[0013] Optionally, along a direction perpendicular to the inner bottom surface of the box body, the spacing distance between the bottom end of the guide structure and the inner bottom surface of the box body is defined as a first spacing distance; and a plurality of guide structures are provided, and the first spacing distances of the plurality of guide structures are equal.

[0014] Optionally, along a direction perpendicular to the inner bottom surface of the box body, the spacing distance between the bottom end of the guide structure and the inner bottom surface of the box body is defined as a first spacing distance; the guide structure is provided in plurality, and along the first flow path, the first spacing distances of the plurality of guide structures increase sequentially.

[0015] Optionally, the surface where the battery cell explosion-proof valve is located is defined as a first battery cell end face; the battery pack also includes a carrier for supporting the battery cell, the carrier is arranged between the first battery cell end face and the inner bottom surface of the box body, the carrier is provided with exhaust holes corresponding to the battery cell explosion-proof valves one by one, the exhaust holes penetrate the carrier so that the gas discharged from the battery cell explosion-proof valve can enter the exhaust channel through the exhaust holes; a protruding connecting structure is provided on the side surface of the carrier away from the first battery cell end face, and the guide structure is connected to the end of the connecting structure away from the battery cell explosion-proof valve.

[0016] Optionally, a tubular structure protruding from and surrounding the exhaust through hole is provided on a surface of one side of the carrier away from the end surface of the first battery cell, and the tubular structure is configured as the connecting structure.

[0017] Optionally, a plurality of the connecting structures are provided, and along the first flow path, the protruding heights of the plurality of connecting structures decrease sequentially.

[0018] Optionally, a partition structure is provided between the inner bottom surface of the box body and the supporting member, and the partition structure is connected to at least one of the box body and the supporting member. The partition structure is used to define the space between the supporting member and the inner bottom surface of the box body into at least two exhaust areas, and each of the exhaust areas includes the exhaust channel.

[0019] From the above, it can be seen that the battery pack provided by the present application has a guide structure arranged in the exhaust channel and near the battery cell. When the battery cell is in thermal runaway, the gas ejected from the battery cell can be promptly guided by the guide surface of the guide structure to change and limit the flow direction of the gas in the exhaust channel, thereby preventing the gas from flowing to other adjacent normal battery cells to a certain extent, helping to reduce the risk of normal battery cells being induced to thermal runaway after being affected by the gas, and helping to prevent thermal diffusion problems in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of a partial structure of a battery pack according to an embodiment of the present application;

[0022] Figure 2 A top view of a local structure of a battery pack according to an embodiment of the present application;

[0023] Figure 3 for Figure 2 A schematic cross-sectional view of the first structure at section AA;

[0024] Figure 4 for Figure 2 A schematic cross-sectional view of the second structure at section AA;

[0025] Figure 5 It is a three-dimensional schematic diagram of a first structure of a carrier connected with battery cells of a battery pack according to an embodiment of the present application;

[0026] Figure 6 for Figure 5 A magnified schematic diagram of part C;

[0027] Figure 7 It is a three-dimensional schematic diagram of a second structure of a carrier connected with battery cells of a battery pack according to an embodiment of the present application;

[0028] Figure 8 for Figure 2Schematic diagram of the cross-section of the third structure at section AA.

[0029] Description of reference numerals:

[0030] 100, box body; 10, bottom plate; 20, side plate; 21, box body explosion-proof valve; 30, accommodation space;

[0031] 200, battery cell row; 210, battery cell; 211, battery cell explosion-proof valve; 212, first battery cell end face;

[0032] 300, guide structure; 310, guide surface;

[0033] 400, exhaust channel; 500, partition structure;

[0034] 600, bearing member; 610, exhaust through hole; 620, connection structure;

[0035] 700. Exhaust area. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0037] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0038] 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.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0040] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like 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.

[0041] like Figure 1 , Figure 1 The partial structure diagram of the battery pack is shown. Figure 1 The battery pack is described by taking the structure shown as an example. The battery pack may include a box body 100, and the box body 100 may include a bottom plate 10 and four side plates 20 connected to the edge of the bottom plate 10, and the bottom plate 10 and the four side plates 20 together define a receiving space 30 located inside the box body 100. The battery pack also includes a plurality of battery cells 210 installed in the receiving space 30, and the battery cells 210 may be cylindrical battery cells 210.

[0042] like Figure 2 , Figure 2 The top view of the local structure of the battery pack is shown. Figure 2 Taking the structure shown in FIG. 1 as an example, the plurality of battery cells 210 can be formed into a plurality of battery cell rows 200, and the plurality of battery cell rows 200 are arranged along the width direction of the box body 100 (eg Figure 2 Each battery cell row 200 includes a plurality of cells arranged along the length direction of the box body 100 (e.g., Figure 2 In order to improve the space utilization of the accommodation space 30, adjacent battery cell rows 200 may be staggered.

[0043] like Figure 1 The side plate 20 of the box 100 is provided with a box explosion-proof valve 21. Figure 3 , Figure 3 Shown Figure 2 Schematic diagram of the cross section AA in FIG. When the battery cell 210 is a cylindrical battery cell, its battery cell explosion-proof valve 211 can be located at the bottom of the battery cell 210, that is, close to the bottom plate 10 of the box 100. When the battery cell 210 has thermal runaway, the battery cell explosion-proof valve 211 will open, and the gas ejected from the battery cell explosion-proof valve 211 will flow in the space between the battery cell 210 and the inner bottom surface of the box 100, and finally be discharged to the outside of the box 100 through the opened box explosion-proof valve 21. Each battery cell 210 in the battery pack can be installed on the same horizontal plane, and each battery cell 210 shares the above space, that is, the bottom of each battery cell 210 is connected to the above space. After the gas ejected from one of the battery cell explosion-proof valves 211 enters the above space, if it is not restricted, it will flow in all directions around, thereby having an adverse effect on multiple adjacent normal battery cells 210, and there is a probability of inducing thermal runaway of the normal battery cell 210.

[0044] In view of this, if Figure 3An embodiment of the present application provides a battery pack, including: a box body 100, the box body 100 has an exhaust channel 400, a plurality of battery cells 210, the plurality of battery cells 210 are all arranged in the box body 100, and the gas discharged from the battery cells 210 is suitable for being discharged to the outside of the box body 100 through the exhaust channel 400; a guide structure 300, the guide structure 300 is arranged in the exhaust channel 400 and is close to the battery cells 210; the guide structure 300 has a guide surface 310, and the guide surface 310 is used to guide the gas discharged from the battery cells and entering the exhaust channel 400.

[0045] Exemplarily, the exhaust passage 400 may be formed by the structure of the housing 100 itself, or may be defined and formed by the housing 100 and a structural member installed inside the housing 100 .

[0046] Exemplarily, the guide structure 300 may be connected to the battery cell 210 or to the box body 100 of the battery pack, so that the position of the guide structure 300 in the battery pack is fixed.

[0047] Exemplarily, the starting point of the exhaust passage 400 may be the battery cell explosion-proof valve 211 of the battery cell 210 , and the end point may be the box explosion-proof valve 21 .

[0048] Exemplarily, the guide structure 300 may be a block structure, a tubular structure or a plate structure.

[0049] Exemplarily, the guide surface 310 may be a flat surface or a concave curved surface.

[0050] When the battery cell 210 has thermal runaway, the gas ejected from the battery cell 210 (which may carry solid particles) will enter the exhaust channel 400. Since the guide structure 300 is disposed in the exhaust channel 400 and is close to the battery cell 210, the gas will first flow toward the guide structure 300 after entering the exhaust channel 400. When the gas flows to the guide surface 310 of the guide structure 300, the guide surface 310 will guide the gas to guide the gas in the exhaust channel 400 to a preset flow direction, so as to limit and guide the flow of the gas through the guide surface 310, and finally discharge the gas from the housing 100.

[0051] The battery pack provided in the embodiment of the present application has a guide structure 300 disposed in the exhaust channel 400 and near the battery cell 210. When the battery cell 210 experiences thermal runaway, the gas ejected from the battery cell 210 can be promptly guided by the guide surface 310 of the guide structure 300 to change and limit the flow direction of the gas in the exhaust channel 400, thereby preventing the gas from flowing to other adjacent normal battery cells 210 to a certain extent, helping to reduce the risk of normal battery cells 210 being induced to experience thermal runaway after being affected by the gas, and helping to prevent thermal diffusion (TP) problems in the battery pack.

[0052] like Figure 3 In some embodiments, the box 100 has a box explosion-proof valve 21, the battery cell 210 has a battery cell explosion-proof valve 211, and the gas is suitable for flowing out of the battery cell explosion-proof valve 211 and flowing through the exhaust channel 400 and then discharged from the box explosion-proof valve 21 to the box 100. The flow path of the gas from the battery cell explosion-proof valve 211 to the box explosion-proof valve 21 is defined as the first flow path (the gas flow direction is as follows Figure 3 The guide structure 300 is configured as a guide surface 310 on the side wall surface facing the box explosion-proof valve 21. Along the first flow path, the guide structure 300 is located downstream of the corresponding battery cell explosion-proof valve 211, and the guide surface 310 is inclined toward the downstream of the gas.

[0053] Illustratively, along the axial direction of the battery cell 210 , the guide surface 310 may be spaced apart from the battery cell explosion-proof valve 211 .

[0054] Exemplarily, the inclined guide surface 310 faces the box explosion-proof valve 21 and the battery cell explosion-proof valve 211 .

[0055] Exemplarily, the surface where the battery cell explosion-proof valve 211 is located is defined as the first battery cell end surface 212 , and the orthographic projection of the guide surface 310 on the first battery cell end surface 212 at least partially overlaps with the battery cell explosion-proof valve 211 .

[0056] Since the guide surface 310 guides the gas ejected from the battery cell explosion-proof valve 211, the guide structure 300 needs to be arranged downstream of the battery cell explosion-proof valve 211 so that the gas can pass through the guide structure 300 after being ejected from the battery cell explosion-proof valve 211. After the gas flows to the guide surface 310 of the guide structure 300, it will flow toward the box explosion-proof valve 21 along the first flow path under the guidance of the inclined guide surface 310, and finally be discharged out of the box 100.

[0057] The guide surface 310 is oriented toward the box explosion-proof valve 21 and is inclined toward the downstream of the gas, and can guide the gas passing through the guide surface 310 directly to the box explosion-proof valve 21, so that the gas flows directly to the box explosion-proof valve 21 along a shorter first flow path in the box 100, thereby reducing the number of normal battery cells 210 through which the gas flows, and helping to further reduce the risk of normal battery cells 210 being induced to have thermal runaway after being affected by the gas.

[0058] like Figure 3 In some embodiments, a plurality of guide structures 300 are provided, and the guide surfaces 310 of at least two guide structures 300 among the plurality of guide structures 300 have different inclination angles.

[0059] For example, the plurality of guide structures 300 arranged along the first flow path have guide surfaces 310 with different inclination angles; or, in a direction perpendicular to the first flow path (eg, Figure 2A plurality of guide structures 300 are arranged in the Y direction (in the Y direction), and the inclination angles of the guide surfaces 310 are different.

[0060] In combination with the above content, it can be known that the gas flows along the guide surface 310 . The different inclination angles of the multiple guide surfaces 310 will cause the gas to flow at different height layers in the exhaust channel 400 after passing through the multiple guide surfaces 310 .

[0061] Combination Figure 3 , along the axial direction of the battery cell 210 (such as Figure 3 In the Z direction of the guide surface 310, when the inclination angle of the guide surface 310 is small, the middle of the guide surface 310 is closer to the battery cell explosion-proof valve 211, and the gas will flow along the first flow path at a height layer close to the battery cell explosion-proof valve 211 in the exhaust channel 400 after the guiding effect of the guide surface 310. On the contrary, when the inclination angle of the guide surface 310 is large, the middle of the guide surface 310 is far away from the battery cell explosion-proof valve 211, and the gas will flow along the first flow path at a height layer far away from the battery cell explosion-proof valve 211 in the exhaust channel 400 after the guiding effect of the guide surface 310.

[0062] When thermal runaway occurs in multiple battery cells 210 , the gas ejected from the explosion-proof valves 211 of different battery cells will flow simultaneously at different height layers in the exhaust channel 400 under the action of multiple guide surfaces 310 with different inclination angles, which helps the gas to be discharged from the battery pack quickly and smoothly.

[0063] like Figure 3 In some embodiments, the surface where the battery cell explosion-proof valve 211 is located is defined as the first battery cell end face 212; the angle b between the guide surface 310 and the first battery cell end face 212 is defined as the inclination angle of the guide surface 310; along the first flow path, the inclination angles of the multiple guide surfaces 310 of the multiple guide structures 300 decrease successively.

[0064] Exemplarily, the plurality of guide structures 300 arranged in a direction perpendicular to the first flow path have guide surfaces 310 with the same inclination angle.

[0065] Exemplarily, along the first flow path, the number of the guide structures 300 is less than or equal to the number of the battery cells 210 .

[0066] by Figure 3 Taking the structure and direction shown as an example, the inclination angles of the guide surfaces 310 of the plurality of guide structures 300 decrease from right to left. The gas discharged from the rightmost (i.e., most upstream) battery cell explosion-proof valve 211 will flow in the lowest layer, the gas discharged from the second right battery cell explosion-proof valve 211 will flow in the second lower layer with a slightly higher height, and so on, the gas discharged from the leftmost (i.e., most downstream) battery cell explosion-proof valve 211 will flow in the uppermost layer.

[0067] Along the first flow path, the gas discharged from the battery cell 210 at the downstream flows in the upper layer, and the gas discharged from the battery cell 210 at the upstream flows in the lower layer. At this time, the gases in the two height layers interfere with each other less during the flow process, and the gases in different height layers can flow quickly and smoothly. If, on the contrary, the gas discharged from the battery cell 210 at the upstream flows in the upper layer, and the gas discharged from the battery cell 210 at the downstream flows in the lower layer, then the gas discharged from the battery cell 210 at the downstream will pass through the gas flowing in the upper layer when entering the lower layer, which will have an adverse effect on the flow of the gas.

[0068] The specific inclination angle of each guide surface 310 can be designed according to the number of guide structures 300 arranged along the first flow path.

[0069] In some embodiments, Figure 2 , a plurality of battery cells 210 are arranged along the first flow path to form at least one battery cell row 200 .

[0070] like Figure 3 , in the same battery cell row 200, the battery cells 210 and the guide structures 300 correspond one to one; and along the first flow path, the absolute value Δa of the difference in the inclination angles of the guide surfaces 310 of two adjacent guide structures 300 is:

[0071] Δa=(90 / n)°

[0072] Wherein, n is the number of battery cells 210 in the same battery cell row 200 .

[0073] It is understandable that the inclination angle of the guide surface 310 needs to be greater than 0°, otherwise it will block the gas ejected from the battery cell explosion-proof valve 211 instead of guiding it. At the same time, the inclination angle of the guide surface 310 also needs to be no greater than 90°, otherwise it is difficult for the guide surface 310 to guide the gas ejected from the battery cell explosion-proof valve 211. Therefore, in this embodiment, for each battery cell row 200, 90° is evenly divided according to the number of battery cells 210 included therein, and the inclination angle of the guide surface 310 of each guide structure 300 is determined according to the angle after the even division.

[0074] Specifically, Figure 3 The structure and direction shown are further explained. Figure 3 Each cell row 200 includes six cells 210, and Δa is 15°. The inclination angles of the guide surfaces 310 of the six guide structures 300 can be designed to be 15°, 30°, 45°, 60°, 75° and 90° from left to right.

[0075] Of course, the inclination angle of the leftmost guide surface 310 can be reduced. For example, the inclination angles of the guide surfaces 310 of the six guide structures 300 are designed to be 10°, 25°, 40°, 55°, 70° and 85° from left to right.

[0076] In this embodiment, the inclination angles of the multiple guide surfaces 310 arranged along the first flow path are arranged in equal steps, so the exhaust passage 400 can be divided into multiple height layers with relatively uniform spatial heights along the vertical direction. Even if multiple battery cells 210 in the same battery cell row 200 have thermal runaway at the same time, it can be ensured that the gas ejected by the battery cell explosion-proof valve 211 of each battery cell 210 can be quickly and smoothly discharged from the box body 100.

[0077] At the same time, this embodiment divides 90 degrees equally according to the number of battery cells 210 in the same battery cell row 200, which helps to improve the space utilization in the height direction of the exhaust channel 400.

[0078] like Figure 3 In some embodiments, the battery cell explosion-proof valve 211 faces the inner bottom surface of the box body 100, and the inner bottom surface of the box body 100 is spaced apart from the battery cell explosion-proof valve 211 to define an exhaust channel 400 between the battery cell explosion-proof valve 211 and the inner bottom surface of the box body 100, and the guide structure 300 is spaced apart from the inner bottom surface of the box body 100.

[0079] Illustratively, the guide structure 300 may be an inclined plate-shaped structure.

[0080] by Figure 3 Taking the structure and direction shown as an example, when the battery cell 210 has thermal runaway, the gas ejected from the battery cell explosion-proof valve 211 will be ejected downward, and under the guidance of the guide surface 310, enter the gap between the guide structure 300 and the inner bottom surface of the box body 100 and flow out of the box body 100. For the gas flowing in the gap, the guide structure 300 can block the gas from flowing upward, which helps to prevent the gas from approaching the normal battery cell 210 upward during the flow along the first flow path, thereby preventing the gas from impacting the normal battery cell 210, thereby protecting the battery cell 210.

[0081] like Figure 3 In some embodiments, along a direction perpendicular to the inner bottom surface of the box body 100 (eg Figure 3 In the Z direction), the spacing distance L between the bottom end of the guide structure 300 and the inner bottom surface of the box body 100 is defined as a first spacing distance; a plurality of guide structures 300 are provided, and the first spacing distances of the plurality of guide structures 300 are equal.

[0082] The first spacing distance is equal, which can ensure the height of the gap between the guide structure 300 and the inner bottom surface of the box body 100 (such as Figure 3 The dimension in the Z direction in the gap is relatively uniform, which prevents the guide structure 300 from hindering the flow of gas in the gap and helps to enable the gas to be discharged from the box body 100 smoothly.

[0083] like Figure 4 , Figure 4 Shown Figure 2 In some embodiments, the guide structure 300 is provided with a plurality of guides along the first flow path (gas flow direction such as Figure 4 ), the first spacing distances of the plurality of guide structures 300 increase sequentially.

[0084] by Figure 4 Taking the multiple guide structures 300 corresponding to one battery cell row 200 as an example, along the first flow path, the first spacing distances of the multiple guide structures 300 increase successively, and a gap area with a triangular longitudinal section is formed below each guide structure 300 (such as Figure 4 The area surrounded by the dotted line in the middle). As the gas ejected from the battery core explosion-proof valve 211 flows from right to left (i.e., from the vertex to the base of the triangle), the space for gas flow is continuously increased, which helps to quickly and smoothly discharge the gas from the box body 100.

[0085] At the same time, it should be noted that the design of this embodiment is also suitable for the arrangement of the battery cells 210 in the battery cell row 200. Figure 4 When all the cells 210 in the cell row 200 have thermal runaway, the space under the leftmost cell 210 needs to allow the gas ejected from the cell explosion-proof valves 211 of all the cells 210 in the cell row 200 to flow, while the space under the rightmost cell 210 only allows the gas ejected from the cell explosion-proof valve 211 of the rightmost cell 210 to flow. Therefore, designing the first spacing distance of the leftmost guide structure 300 to be larger also meets the above gas flow requirements.

[0086] like Figure 3 In some embodiments, the battery pack further includes a carrier 600 for supporting and placing the battery cell 210. The carrier 600 is disposed between the first battery cell end surface 212 and the inner bottom surface of the box body 100. The carrier 600 is provided with exhaust holes 610 corresponding to the battery cell explosion-proof valves 211 one by one. The exhaust holes 610 penetrate the carrier 600 so that the gas discharged from the battery cell explosion-proof valves 211 can enter the exhaust channel 400 through the exhaust holes 610.

[0087] For example, the first cell end surface 212 of the cell 210 may be connected to the carrier 600 by bonding.

[0088] Exemplarily, a surface of the carrier 600 away from the inner bottom surface of the box body 100 is provided with a groove for positioning the battery cell 210 , and the exhaust hole 610 is provided at the bottom of the groove.

[0089] Exemplarily, the carrier 600 may abut against the inner bottom surface of the box body 100 , or abut against a protruding structure provided on the inner side wall of the box body 100 , so that the position of the carrier 600 in the accommodating space 30 is fixed.

[0090] The carrier 600 provides a mounting structure foundation for the multiple battery cells 210 in the accommodating space 30, ensuring that the multiple battery cells 210 can be stably and reliably mounted in the accommodating space 30 of the box 100. At the same time, by providing the exhaust through hole 610 on the carrier 600, it is possible to prevent the carrier 600 from blocking the battery cell explosion-proof valve 211, and when the battery cell 210 has thermal runaway, it is ensured that the battery cell explosion-proof valve 211 can be opened smoothly to release gas to the exhaust channel 400.

[0091] like Figure 5 , Figure 5 A three-dimensional schematic diagram of a carrier 600 connected to a battery cell 210 is shown. In some embodiments, a protruding connection structure 620 is disposed on a side surface of the carrier 600 away from the first battery cell end surface 212, and the guide structure 300 is connected to the end of the connection structure 620 away from the battery cell explosion-proof valve 211.

[0092] Exemplarily, the connection structure 620 may be connected to the carrier 600 by bonding, plugging, clamping, welding, threading or integrally forming.

[0093] Exemplarily, the guide structure 300 may be connected to the connection structure 620 by bonding, plugging, clamping, welding or integrally forming.

[0094] Exemplarily, the connection structure 620 may be a plate-like structure, a block-like structure, or a column-like structure.

[0095] By providing the connecting structure 620, it can be ensured that the guide structure 300 and the battery cell explosion-proof valve 211 are spaced apart, so as to form a larger space between the guide surface 310 and the battery cell explosion-proof valve 211. On the one hand, it can be ensured that the battery cell explosion-proof valve 211 can be opened smoothly, and on the other hand, it can also be ensured that the gas ejected from the battery cell explosion-proof valve 211 can have sufficient discharge space.

[0096] like Figure 6 , Figure 6 for Figure 5 The enlarged schematic diagram of the C portion in the middle. In some embodiments, a tubular structure protruding from and surrounding the exhaust through hole 610 is provided on a surface of the carrier 600 away from the first battery cell end surface 212 , and the tubular structure is configured as a connecting structure 620 .

[0097] The connection structure 620 is designed as a tubular structure surrounding the exhaust through hole 610. The tubular structure can circumferentially constrain the gas ejected from the battery cell explosion-proof valve 211. On the one hand, it can prevent the gas from affecting other normal battery cells 210. On the other hand, it can also guide the gas to the guide surface 310, which helps to improve the guiding effect of the guide surface 310 on the gas.

[0098] Figure 5 Each guide structure 300 is arranged along the axial direction of the battery cell 210 (eg Figure 5 The heights of the guide structures 300 (in the Z direction) are equal, that is, the first spacing distances of the guide structures 300 are equal.

[0099] like Figure 7 , Figure 7 A perspective schematic diagram of a second structure of a carrier 600 connected to a battery cell 210 is shown. Figure 7 In the embodiment, the heights of the guide structures 300 along the axial direction of the battery cell 210 are not completely equal. Figure 7 The heights of the plurality of guide structures 300 arranged in a direction (the direction indicated by the dotted arrow line in FIG. 1 ) decrease successively.

[0100] In some embodiments, a plurality of connection structures 620 are provided, and along the first flow path, the protruding heights of the plurality of connection structures 620 decrease sequentially.

[0101] In combination with the above-mentioned embodiment, along the first flow path, the first spacing distances of the plurality of guide structures 300 are successively reduced. In order to realize the above structure, the height of each guide structure 300 (the height along the axial direction of the battery cell 210) can be successively reduced according to the above rule, and the protruding heights of the connection structures 620 corresponding to each guide structure 300 are equal, such as Figure 4 Alternatively, the heights of the guide structures 300 may be equal, and the protruding heights of the connecting structures 620 corresponding to the guide structures 300 may be reduced in sequence according to the above-mentioned rule; or, the heights of the guide structures 300 and the protruding heights of the connecting structures 620 may be reduced in sequence according to the above-mentioned rule.

[0102] like Figure 8 , Figure 8 Shown Figure 2 In some embodiments, a partition structure 500 is provided between the inner bottom surface of the box body 100 and the carrier 600. The partition structure 500 is connected to at least one of the box body 100 and the carrier 600. The partition structure 500 is used to define at least two exhaust areas 700 (such as Figure 8), each exhaust region 700 includes an exhaust channel 400.

[0103] Exemplarily, the partition structure 500 may be a strip-shaped structure or a plate-shaped structure extending in a direction perpendicular to the inner bottom surface of the box body 100 .

[0104] Exemplarily, the partition structure 500 may be connected to the inner bottom surface of the box body 100 and abut against the bearing member 600 ; or, the partition structure 500 may abut against the inner bottom surface of the box body 100 and be connected to the bearing member 600 .

[0105] Exemplarily, the partition structure 500 may be connected to the box body 100 or the carrier 600 by bonding, welding, plugging, snapping, fastener connection or integral molding.

[0106] by Figure 8 To further illustrate the structure and direction shown, the partition structure 500 is located in the space between the support member 600 and the inner bottom surface of the box body 100. The partition structure 500 defines the space into two exhaust areas 700 located on the left and right sides thereof, respectively, so as to form more exhaust channels 400 in the space, which helps to enable the gas ejected from the battery cell explosion-proof valve 211 to be discharged from the box body 100 faster and more smoothly.

[0107] It should be noted that the above describes some embodiments of the present 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 an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0108] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0109] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0110] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0111] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0112] The embodiments of the present 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 the present application should be included in the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include: A box body, wherein the box body has an exhaust passage; A plurality of battery cells, each of which is disposed in the box, and the gas exhausted from the battery cells is suitable for being exhausted out of the box through the exhaust passage; A guide structure is provided in the exhaust passage and is close to the battery cell; the guide structure has a guide surface, and the guide surface is used to guide the gas discharged from the battery cell and entering the exhaust passage.

2. The battery pack according to claim 1, characterized in that: The box body has a box explosion-proof valve, and the battery cell has a battery cell explosion-proof valve. The gas is suitable for flowing out of the battery cell explosion-proof valve and passing through the exhaust channel and then discharged from the box body from the box explosion-proof valve. The flow path of the gas flowing from the battery cell explosion-proof valve to the box explosion-proof valve is defined as a first flow path; the side wall surface of the guide structure facing the box explosion-proof valve is configured as the guide surface, and along the first flow path, the guide surface is inclined toward the downstream of the gas.

3. The battery pack according to claim 2, characterized in that: The guide structures are provided in plurality, and the guide surfaces of at least two of the plurality of guide structures have different inclination angles.

4. The battery pack according to claim 3, characterized in that: The surface where the battery cell explosion-proof valve is located is defined as the first battery cell end face; the angle between the guide surface and the first battery cell end face is defined as the inclination angle of the guide surface; Along the first flow path, the inclination angles of the guide surfaces of the guide structures decrease sequentially.

5. The battery pack according to claim 4, characterized in that: A plurality of the battery cells are arranged along the first flow path to form at least one battery cell row; In the same battery cell row, the battery cells and the guide structures correspond one to one; and along the first flow path, the absolute value Δa of the difference in the inclination angles of the guide surfaces of two adjacent guide structures is: Δa=(90 / n)° Wherein, n is the number of the battery cells in the same battery cell row.

6. The battery pack according to claim 2, characterized in that: The battery cell explosion-proof valve faces the inner bottom surface of the box body, and the inner bottom surface of the box body is spaced apart from the battery cell explosion-proof valve to define the exhaust channel between the battery cell explosion-proof valve and the inner bottom surface of the box body, and the guide structure is spaced apart from the inner bottom surface of the box body.

7. The battery pack according to claim 6, characterized in that: Along a direction perpendicular to the inner bottom surface of the box body, a spacing distance between the bottom end of the guide structure and the inner bottom surface of the box body is defined as a first spacing distance; A plurality of guide structures are provided, and the first spacing distances of the plurality of guide structures are equal.

8. The battery pack according to claim 6, characterized in that: Along a direction perpendicular to the inner bottom surface of the box body, a spacing distance between the bottom end of the guide structure and the inner bottom surface of the box body is defined as a first spacing distance; A plurality of guide structures are provided, and along the first flow path, the first spacing distances of the plurality of guide structures increase sequentially.

9. The battery pack according to claim 6, characterized in that: The surface where the battery core explosion-proof valve is located is defined as the first battery core end surface; The battery pack further comprises a carrier for supporting and placing the battery cell, the carrier being arranged between the end surface of the first battery cell and the inner bottom surface of the box body, the carrier being provided with exhaust through holes corresponding to the battery cell explosion-proof valves one by one, the exhaust through holes penetrating the carrier so that the gas exhausted from the battery cell explosion-proof valves can enter the exhaust channel through the exhaust through holes; A protruding connection structure is provided on a surface of one side of the carrier away from the end surface of the first battery cell, and the guide structure is connected to an end of the connection structure away from the battery cell explosion-proof valve.

10. The battery pack according to claim 9, characterized in that: A tubular structure that protrudes and surrounds the exhaust through hole is provided on a surface of one side of the carrier away from the end surface of the first battery cell, and the tubular structure is configured as the connecting structure.

11. The battery pack according to claim 9, characterized in that: A plurality of the connecting structures are provided, and along the first flow path, the protruding heights of the plurality of connecting structures decrease in sequence.

12. The battery pack according to claim 9, characterized in that: A partition structure is provided between the inner bottom surface of the box body and the supporting member, and the partition structure is connected to at least one of the box body and the supporting member. The partition structure is used to define the space between the supporting member and the inner bottom surface of the box body into at least two exhaust areas, and each of the exhaust areas includes the exhaust channel.

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