Battery pack

Abstract

The utility model provides a battery pack, which comprises a box body, a battery pack and a battery pack, the plurality of battery cells are all 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; and the interception structure is arranged in the exhaust channel, the interception structure is provided with an interception surface, and the interception surface is used for intercepting particulate matters discharged by the battery cell and mixed in the gas. According to the battery pack provided by the invention, the interception structure is arranged in the exhaust channel of the box body, so that particulate matters in the gas sprayed out of the battery cells can be intercepted when the battery cells are in thermal runaway, the particulate matters are prevented from continuously flowing in the battery pack along with the gas, and the particulate matters are prevented from causing adverse effects on devices in the battery pack and blocking an explosion-proof valve of the box body; and the problems of gas detonation and heat 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 a plurality of 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 eject thermal runaway gas outward. However, the thermal runaway gas ejected from the battery cell explosion-proof valve will also carry some solid particles inside the battery cell. These particles flow in the existing box body with the thermal runaway gas and are likely to have adverse effects on other devices installed in the existing box body, and are easy to block the box body explosion-proof valve.

[0003] Therefore, how to reduce the adverse effects of particulate matter ejected from the battery cell explosion-proof valve on the battery pack 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 exhausted by the battery cells is suitable for being discharged to the outside of the box through the exhaust channel; an interception structure, arranged in the exhaust channel, the interception structure having an interception surface, and the interception surface is used to intercept particulate matter mixed in the gas discharged by the battery cells.

[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; along the first flow path, the side wall surface of the interception structure facing upstream of the gas is configured as the interception surface.

[0007] Optionally, the surface where the battery cell explosion-proof valve is located is defined as a first battery cell end face, and the orthographic projection of the interception surface corresponding to the battery cell explosion-proof valve on the first battery cell end face is defined as an interception surface projection; along the first flow path, at least part of the battery cell explosion-proof valve is located upstream of the interception surface projection.

[0008] Optionally, along the first flow path, the battery cell explosion-proof valve does not overlap with a projection of the interception surface.

[0009] Optionally, the intercepting surface is a plane or a concave curved surface.

[0010] Optionally, the surface where the battery cell explosion-proof valve is located is defined as the first battery cell end face; when the intercepting surface is a concave curved surface, the intercepting surface is bent with the straight line where the first direction is located as the axis, and the first direction is the height direction of the battery cell; and / or, the intercepting surface is bent with the straight line where the second direction is located as the axis, and the second direction intersects with the first direction.

[0011] 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 intercepting structure is connected to the inner bottom surface of the box body.

[0012] Optionally, the intercepting surface is inclined toward the upstream of the gas.

[0013] 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 at least partially 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 pass through the carrier so that the gas discharged from the battery cell explosion-proof valve can enter the exhaust channel through the exhaust holes; along the direction perpendicular to the inner bottom surface of the box body, the top of the interception structure is spaced apart from the carrier.

[0014] Optionally, a plurality of intercepting structures are provided, each of which corresponds to at least one battery cell explosion-proof valve; and adjacent intercepting structures are arranged at intervals.

[0015] From the above, it can be seen that the battery pack provided in the present application can intercept particulate matter in the gas ejected from the battery cell when thermal runaway occurs in the battery cell by providing an interception structure in the exhaust passage of the box body, so as to prevent the particulate matter from continuing to flow with the gas in the box body, thereby preventing the particulate matter from causing adverse effects on the devices in the battery pack and clogging the explosion-proof valve of the box body, which helps to prevent gas explosion problems and heat diffusion problems in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic diagram of a partial structure of a battery pack according to an embodiment of the present application;

[0018] Figure 2 A top view of a local structure of a battery pack according to an embodiment of the present application;

[0019] Figure 3 for Figure 2 Schematic diagram of the cutaway of section AA;

[0020] Figure 4 A bottom view of a first cell end surface of a cell of a battery pack according to an embodiment of the present application;

[0021] Figure 5 for Figure 2 Schematic diagram of the cutaway of the BB section;

[0022] Figure 6 for Figure 2 A schematic cross-sectional view of the second structure at section AA;

[0023] Figure 7 for Figure 2 A schematic cross-sectional view of the second structure of the middle BB section;

[0024] Figure 8 A schematic top view of a box body of a second structure of a battery pack according to an embodiment of the present application;

[0025] Fig. 9 A three-dimensional schematic diagram of a box body of a second structure of a battery pack according to an embodiment of the present application;

[0026] Fig.10 A three-dimensional schematic diagram of a box body of a first structure of a battery pack according to an embodiment of the present application;

[0027] Fig.11 A schematic top view of a box body of a first structure of a battery pack according to an embodiment of the present application;

[0028] Fig.12 for Fig.11 Schematic diagram of the cross-section of CC in .

[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, interception structure; 310, interception surface;

[0033] 400, exhaust passage;

[0034] 500, interception surface projection;

[0035] 600, a bearing member; 610, an exhaust hole. 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 battery pack includes a box 100, which includes a bottom plate 10 and four side plates 20 connected to the edges of the bottom plate 10. The bottom plate 10 and the four side plates 20 define a receiving space 30 inside the box 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.

[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 210, its battery cell explosion-proof valve 211 can be located at the bottom of the battery cell 210, close to the bottom plate 10 of the box 100. When the battery cell 210 has thermal runaway, the box explosion-proof valve 21 will open, and the thermal runaway gas ejected from the battery cell explosion-proof valve 211 will carry particulate matter and flow in the direction of the box explosion-proof valve 21. After the thermal runaway gas flows to the box explosion-proof valve 21, part of the gas will be discharged to the outside of the box 100 through the box explosion-proof valve 21, but at least part of the particulate matter cannot pass through the box explosion-proof valve 21, and these particulate matter will block the box explosion-proof valve 21, making it difficult for the gas that arrives later to be discharged to the outside of the box 100 through the box explosion-proof valve 21, which may cause gas explosion problems and thermal diffusion (TP) problems inside the battery pack.

[0044] In view of this, if Figure 3 An embodiment of the present application provides a battery pack, including: a box body 100, having an exhaust channel 400 therein; a plurality of battery cells 210, all of which are arranged in the box body 100, and the gas exhausted by the battery cells 210 is suitable for being discharged to the outside of the box body 100 through the exhaust channel 400; an interception structure 300, arranged in the exhaust channel 400, the interception structure 300 has an interception surface 310, and the interception surface 310 is used to intercept particulate matter mixed in the gas exhausted by the battery cells 210.

[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 interception structure 300 may be connected to the battery cell 210 or to the case 100 of the battery pack so that the position of the interception 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 interception structure 300 may be a block structure, a tubular structure, a plate structure or a columnar structure.

[0049] Exemplarily, the interception surface 310 can be any surface of the interception structure 300. For example, when the interception structure 300 is a block structure, the interception surface 310 can be a side wall surface or a top surface; when the interception structure 300 is a tubular structure, the interception surface 310 can be an outer peripheral surface, an inner peripheral surface or an end surface.

[0050] Exemplarily, the intercepting surface 310 may be a smooth surface, a surface provided with a microstructure (such as depressions or protrusions), or a surface connected with a medium layer (such as a glue layer, a mesh layer, or a wool layer).

[0051] When the battery cell 210 has thermal runaway, the gas ejected from the battery cell 210 carries the particles and flows along the exhaust passage 400 to the outside of the housing 100. When passing through the interception structure 300 disposed in the exhaust passage 400, the interception surface 310 of the interception structure 300 intercepts the particles in the gas, preventing the particles from continuing to flow with the gas, so that at least part of the particles adhere to or accumulate on the interception surface 310; while the gas can continue to flow through or bypass the interception structure 300, and finally be discharged to the outside of the housing 100.

[0052] The battery pack provided in the embodiment of the present application can intercept particulate matter in the gas ejected from the battery cell 210 when the battery cell 210 is in thermal runaway by disposing an interception structure 300 in the exhaust passage 400 of the box body 100, so as to prevent the particulate matter from continuing to flow with the gas in the box body 100, thereby preventing the particulate matter from causing adverse effects on the devices in the battery pack and clogging the box body explosion-proof valve 21, which helps to prevent gas explosion problems and heat diffusion problems in the battery pack.

[0053] 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 Along the first flow path, the side wall surface of the intercepting structure 300 facing the upstream of the gas is configured as an intercepting surface 310.

[0054] Exemplarily, the surface area of ​​the interception surface 310 is not less than the surface area of ​​other side walls of the interception structure 300. For example, when the interception structure 300 is a plate-like structure, the plate surface of the plate-like structure can be used as the interception surface 310.

[0055] The gas flows from the battery cell explosion-proof valve 211 to the box explosion-proof valve 21. The side of the interception structure 300 close to the battery cell explosion-proof valve 211 is the upstream of the gas, and the side of the interception structure 300 close to the box explosion-proof valve 21 is the downstream of the gas. When the gas reaches the interception structure 300, it will preferentially contact the interception surface 310 facing upstream. Under the blocking effect of the interception surface 310, the flow rate of the gas will be reduced, and the particles carried by the gas will settle at the interception surface 310, so as to achieve the purpose of intercepting the particles in the gas discharged from the battery cell explosion-proof valve 211.

[0056] like Figure 3 In some embodiments, the surface where the cell explosion-proof valve 211 is located is defined as the first cell end surface 212, and the orthographic projection of the interception surface 310 corresponding to the cell explosion-proof valve 211 on the first cell end surface 212 is defined as the interception surface projection 500. Figure 4 , Figure 4 The schematic diagram of the bottom view of the first cell end face 212 is shown. Figure 4 ), at least a portion of the battery cell explosion-proof valve 211 is located upstream of the interception surface projection 500.

[0057] In combination with the above content, the battery cell explosion-proof valve 211 is the starting point of the first flow path, and the interception surface 310 can block the gas in the first flow path to achieve the interception effect on the particulate matter in the gas. Then, it can be understood that along the first flow path, the interception surface 310 can only intercept the gas flowing from the upstream to the interception surface 310, so it is necessary to ensure that the battery cell explosion-proof valve 211 is at least partially located upstream of the interception surface 310. In other words, the interception surface 310 can intercept the gas ejected from the part of the battery cell explosion-proof valve 211 located upstream of the interception surface 310; while it is difficult to intercept the part of the battery cell explosion-proof valve 211 located downstream of the interception surface 310.

[0058] like Figure 4 In some embodiments, along the first flow path, the battery cell explosion-proof valve 211 does not overlap with the interception surface projection 500 .

[0059] Exemplarily, the interception surface 310 is close to the battery cell explosion-proof valve 211 to intercept the particulate matter carried in the gas at an initial position close to the first flow path, thereby reducing the impact of the particulate matter on other devices in the battery pack.

[0060] In order to improve the interception effect of the interception surface 310, the gas flow rate passing through the interception surface 310 can be increased. To this end, it is necessary to make the battery cell explosion-proof valve 211 corresponding to the interception surface 310 located upstream of the interception surface 310 as a whole, so that the gas ejected from the battery cell explosion-proof valve 211 will pass through the interception surface 310 during the process of flowing along the first flow path, that is, the interception surface 310 intercepts all the gas ejected from the battery cell explosion-proof valve 211, and the interception surface 310 intercepts a larger amount of particulate matter carried in the gas.

[0061] like Figure 3 In some embodiments, the intercepting surface 310 is a plane.

[0062] Designing the interception surface 310 to be a plane can reduce the structural complexity of the interception structure 300 while ensuring that the interception structure 300 has an interception effect on particulate matter in the flowing gas, thereby helping to reduce costs.

[0063] like Figure 5 , Figure 5 Shown Figure 2 Schematic diagram of the cutaway view of section BB.

[0064] Exemplarily, the vertical centerline of the interception structure 300 (eg Figure 5 The dotted line in FIG. 2 and the vertical center line of the corresponding battery cell 210 are in the same vertical plane.

[0065] For example, the width of the interception surface 310 (the width of the interception structure 300 along the Figure 5 The dimension in the X direction in the figure can be slightly smaller than the diameter of the battery cell explosion-proof valve 211, or equal to the diameter of the battery cell explosion-proof valve 211, or larger than the diameter of the battery cell explosion-proof valve 211. The width of the intercepting surface 310 can be designed according to the specific structure of the battery cell 210 and / or the battery pack, and is not limited here.

[0066] Exemplarily, the sidewalls of the interception structure 300 along the width direction may be vertical sidewalls.

[0067] like Figure 6 , Figure 6 The battery pack is shown in Figure 2 A schematic cross-sectional view of the second structure of section AA in FIG.

[0068] The interception surface 310 is designed to be a curved surface that is recessed into the interior of the interception structure 300. On the one hand, the surface area of ​​the interception surface 310 can be increased to improve the interception effect of the interception surface 310 on particulate matter in the gas; on the other hand, the inwardly recessed curved surface can gather particulate matter toward the middle of the interception surface 310 to prevent the particulate matter from moving along the surface of the interception surface 310 toward the edge, thereby helping to prevent the particulate matter from detaching from the interception surface 310.

[0069] like Figure 7 , Figure 7 The battery pack is shown in Figure 2 Schematic diagram of the cross-section of the second structure in section BB.

[0070] Exemplarily, the sidewalls of the interception structure 300 along the width direction may be curved sidewalls.

[0071] The intercepting surface 310 may be curved in only one direction, such as Figure 8 , Figure 8 The schematic diagram of the top view of the box 100 of the second structure is shown. In some embodiments, the interception surface 310 of the interception structure 300 is along the straight line (such as Figure 8 The first direction is the height direction of the battery cell 210. For example, the intercepting surface 310 is bent from both ends to the middle. In this embodiment, the intercepting surface 310 is bent transversely, which can effectively increase the transverse surface area of ​​the intercepting surface 310.

[0072] Or, if Figure 6 In some embodiments, when the interception surface 310 is a concave surface, the interception surface 310 is located along the straight line of the second direction (such as Figure 6 The X direction in the figure) is the axis bending, and the second direction intersects with the first direction.

[0073] Exemplarily, the second direction is perpendicular to the first direction.

[0074] In this embodiment, the intercepting surface 310 is curved longitudinally, which can effectively increase the longitudinal surface area of ​​the intercepting surface 310 .

[0075] Of course, the interception surface 310 can be curved both longitudinally and transversely, that is, the interception surface 310 can be a concave spherical surface. In this way, the surface area of ​​the interception surface 310 can be further increased, which helps to further improve the interception effect of particulate matter in the gas.

[0076] like Figure 6 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 interception structure 300 is connected to the inner bottom surface of the box body 100.

[0077] like Fig. 9 , Fig. 9 The third embodiment shows a perspective view of a second structure of the box 100 . The interception structure 300 is connected to the inner bottom surface of the box 100 .

[0078] Exemplarily, the interception structure 300 may be connected to the inner bottom surface of the box body 100 by bonding, welding, plugging, snapping, fastener connection or integral molding.

[0079] Normally, for the gas flowing in the exhaust passage 400, the particles carried by the gas are located in the lower layer of the gas due to gravity, that is, close to the inner bottom surface of the box 100. In this embodiment, the interception structure 300 is connected to the inner bottom surface of the box 100. On the one hand, the interception structure 300 is located in the gas layer with a higher concentration of particles in the gas, which helps to improve the interception effect of particles in the gas; on the other hand, the interception structure 300 is connected to the inner bottom surface of the box 100, so that there is no gap between the interception structure 300 and the inner bottom surface of the box 100, which helps to keep the particles deposited on the inner bottom surface of the box 100 at the location of the interception surface 310, and prevent the deposited particles from moving again under the action of the subsequent arriving gas.

[0080] like Fig.10 , Fig.10 The perspective schematic diagram of the first structure of the housing 100 is shown. In some embodiments, the intercepting surface 310 is inclined toward the upstream of the gas.

[0081] For example, the inclination angle of the intercepting surface 310 (ie, the angle between the intercepting surface 310 and the inner bottom surface of the box body 100 ) can be designed according to the specific structure of the battery cell 210 and / or the battery pack, and is not limited here.

[0082] by Figure 3 Taking the structure and direction shown as an example, along the first flow path, the gas flows from the upstream (i.e., the left side of the interception surface 310) through the interception surface 310 to the downstream (i.e., the right side of the interception surface 310). When the gas reaches the interception surface 310, since the interception surface 310 is inclined toward the upstream of the gas, the particulate matter in the gas is intercepted by the interception surface 310 and moves along the inclined interception surface 310 toward the inner bottom surface of the box body 100, which helps to improve the sedimentation efficiency of the particulate matter in the gas and prevent the deposited particulate matter from moving again under the action of the subsequent arriving gas.

[0083] like Figure 3 In some embodiments, the battery pack further comprises a carrier 600 for supporting and placing the battery cell 210, the carrier 600 is at least partially 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 through holes 610 corresponding to the battery cell explosion-proof valves 211, the exhaust through holes 610 pass through 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 through holes 610; along a direction perpendicular to the inner bottom surface of the box body 100 (such as Figure 3In the Z direction), the top of the intercepting structure 300 is spaced apart from the supporting member 600.

[0084] For example, the first cell end surface 212 of the cell 210 may be connected to the carrier 600 by bonding.

[0085] 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.

[0086] 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.

[0087] The top of the interception structure 300 and the carrier 600 are spaced apart to form a gap for gas flow therebetween, which helps the gas ejected from the battery cell explosion-proof valve 211 to flow smoothly in the box body 100 and eventually be discharged from the box body 100 .

[0088] Meanwhile, it should be noted that, in combination with the above content, for the gas flowing in the exhaust passage 400, the concentration of particulate matter in the lower layer of the gas is higher, and the concentration of particulate matter in the upper layer is lower. Figure 3 It can be seen that the above gap corresponds to the upper layer of the gas, and therefore does not cause a significant adverse effect on the effect of intercepting particulate matter in the gas.

[0089] like Fig.11 , Fig.11 The schematic diagram of the top view of the box body 100 of the first structure is shown. In some embodiments, a plurality of interception structures 300 are provided, and each interception structure 300 corresponds to at least one battery cell explosion-proof valve 211 .

[0090] Usually, if Figure 3 , each battery cell 210 has a battery cell explosion-proof valve 211 , that is, the number of interception structures 300 ≤ the number of battery cells 210 .

[0091] It should be noted that when an interception structure 300 corresponds to two battery cell explosion-proof valves 211, illustratively, the two battery cell explosion-proof valves 211 can be located upstream of the interception structure 300 along the first flow path, so that the gas ejected by the two battery cell explosion-proof valves 211 will pass through the interception structure 300 during the process of flowing along the first flow path, so that the particulate matter in the gas ejected by the two battery cell explosion-proof valves 211 can be intercepted by the interception surface 310.

[0092] like Fig.11 , adjacent interception structures 300 are arranged at intervals.

[0093] The two adjacent intercepting structures 300 are arranged at intervals, so that a gap for gas flow can be formed between the two adjacent intercepting structures 300, which helps the gas ejected from the battery cell explosion-proof valve 211 to flow smoothly in the box body 100 and finally be discharged from the box body 100.

[0094] It should also be noted that the vertical height of the interception structure 300 protruding from the inner bottom surface of the box body 100 can be designed according to the structure of the box body 100 and is not limited here.

[0095] like Figure 6 and Fig.12 , Fig.12 Shown Fig.11 For example, the vertical height of the interception structure 300 can be determined according to the setting position of the box explosion-proof valve 21 on the side plate 20. Usually, the vertical height of the interception structure 300 will not be higher than the center height of the box explosion-proof valve 21 to avoid the interception structure 300 causing a greater obstruction to the exhaust of the box 100.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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; An interception structure is arranged in the exhaust passage, and the interception structure has an interception surface, and the interception surface is used to intercept particulate matter mixed in the gas discharged from the battery cell.

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 being 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; along the first flow path, the side wall surface of the interception structure facing the upstream of the gas is configured as the interception surface.

3. The battery pack according to claim 2, characterized in that: The surface where the battery cell explosion-proof valve is located is defined as a first battery cell end face, and the orthographic projection of the interception surface corresponding to the battery cell explosion-proof valve on the first battery cell end face is defined as an interception surface projection; Along the first flow path, at least a portion of the battery cell explosion-proof valve is located upstream of a projection of the interception surface.

4. The battery pack according to claim 3, characterized in that: Along the first flow path, the battery cell explosion-proof valve does not overlap with the projection of the interception surface.

5. The battery pack according to claim 2, characterized in that: The intercepting surface is a plane or a concave curved surface.

6. The battery pack according to claim 5, characterized in that: The surface where the explosion-proof valve of the battery cell is located is defined as the first battery cell end face; when the intercepting surface is a concave curved surface, the intercepting surface is bent with the straight line of the first direction as the axis, and the first direction is the height direction of the battery cell; and / or, The intercepting surface is bent with a straight line where a second direction is located as an axis, and the second direction intersects with the first direction.

7. 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 interception structure is connected to the inner bottom surface of the box body.

8. The battery pack according to claim 7, characterized in that: The intercepting surface is inclined toward the upstream of the gas.

9. The battery pack according to claim 7, 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, wherein the carrier is at least partially disposed between the end surface of the first battery cell and the inner bottom surface of the box body, and the carrier is provided with exhaust through holes corresponding to the battery cell explosion-proof valves one by one, and the exhaust through holes penetrate the carrier so that the gas exhausted by the battery cell explosion-proof valve can enter the exhaust channel through the exhaust through holes; Along a direction perpendicular to the inner bottom surface of the box body, the top of the intercepting structure is spaced apart from the supporting member.

10. The battery pack according to claim 7, characterized in that: There are multiple interception structures, each of which corresponds to at least one battery cell explosion-proof valve, and adjacent interception structures are arranged at intervals.

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