Battery pack

Abstract

In the battery pack provided by the present disclosure, by providing the blocking structure in the exhaust passage of the case, when the battery cell is in thermal runaway, the particles in the gas ejected from the battery cell can be blocked to prevent the particles from continuing to flow into the battery pack together with the gas, thereby preventing the particles from adversely affecting the devices in the battery pack or blocking the case explosion-proof valve, and preventing the gas explosion problem and the heat diffusion problem from occurring in the battery pack.SOLUTION: The present disclosure provides a battery pack, including a case having an exhaust passage, a plurality of battery cells disposed in the case and adapted to discharge gas out of the case through the exhaust passage, and a blocking structure disposed in the exhaust passage and having a blocking surface for blocking particles entrained in the gas discharged from the battery cells.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to the technical field of power batteries, and in particular to battery packs. [Background technology]

[0002] In the related art, a conventional battery pack includes a conventional case and multiple battery cells mounted within the case, each of which has a battery cell explosion prevention valve. When a battery cell experiences thermal runaway, the battery cell explosion prevention valve ejects thermal runaway gas to the outside. However, the thermal runaway gas ejected from the battery cell explosion prevention valve also carries solid particles from inside the battery cell. These particles flow into the conventional case along with the thermal runaway gas, which is likely to adversely affect other devices in the case and likely to clog the case explosion prevention valve.

[0003] Therefore, how to reduce the adverse effects on battery packs of particles ejected from the battery cell explosion prevention valve has become an issue that needs to be resolved as soon as possible. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a battery pack that prevents the problems of gas explosion and heat diffusion from occurring. [Means for solving the problem]

[0005] Based on the above object, the present invention provides a battery pack comprising: a case having an exhaust passage; a plurality of battery cells, all of which are arranged within the case and adapted to allow exhaust gas to pass through the exhaust passage and be exhausted to the outside of the case; and a blocking structure, arranged in the exhaust passage, having a blocking surface that blocks particles from being mixed into the gas exhausted from the battery cells.

[0006] In one embodiment of the present invention, the case has a case explosion-proof valve, the battery cell has a battery cell explosion-proof valve, the gas is suitable to flow out of the case from the battery cell explosion-proof valve and into the exhaust passage, and then be discharged to the outside of the case from the case explosion-proof valve, the flow path through which the gas flows from the battery cell explosion-proof valve to the case explosion-proof valve is defined as a first flow path, and the side wall surface of the blocking structure facing upstream of the gas along the first flow path is configured as the blocking surface.

[0007] In one embodiment of the present invention, the surface on which the battery cell explosion-proof valve is located is defined as a first battery cell end face, the orthogonal projection of the blocking surface corresponding to the battery cell explosion-proof valve on the first battery cell end face is defined as a blocking surface projection, and at least a portion of the battery cell explosion-proof valve is located upstream of the blocking surface projection along the first flow path.

[0008] In one embodiment of the present invention, the battery cell explosion-proof valve does not overlap the cutoff surface projection along the first flow path.

[0009] In one embodiment of the present invention, the blocking surface is a flat surface or a concave curved surface.

[0010] In one embodiment of the present invention, the surface on which the battery cell explosion-proof valve is located is defined as the end surface of the first battery cell, and when the blocking surface is a concave curved surface, the blocking surface is curved around an axis that is a straight line in a first direction, the first direction being the height direction of the battery cell, and / or the blocking surface is curved around an axis that is a straight line in a second direction, the second direction intersecting with the first direction.

[0011] In one embodiment of the present invention, the battery cell explosion-proof valve faces the inner bottom surface of the case, the inner bottom surface of the case is spaced apart from the battery cell explosion-proof valve, the exhaust passage is defined between the battery cell explosion-proof valve and the inner bottom surface of the case, and the blocking structure is connected to the inner bottom surface of the case.

[0012] In one embodiment of the present invention, the blocking surface is inclined toward the upstream side of the gas.

[0013] In one embodiment of the present invention, the surface on which the battery cell explosion-proof valve is located is defined as an end face of a first battery cell, and the case further includes a support member for supporting and arranging the battery cell, at least a portion of the support member being disposed between the end face of the first battery cell and the inner bottom surface of the case, the support member being provided with exhaust holes corresponding to the battery cell explosion-proof valves, the exhaust holes penetrating the support member so that gas discharged from the battery cell explosion-proof valves can pass through the exhaust holes and enter the exhaust passage, and the top of the blocking structure is disposed apart from the support member along a direction perpendicular to the inner bottom surface of the case.

[0014] In one embodiment of the present invention, a plurality of the blocking structures are provided, each corresponding to at least one of the battery cell explosion-proof valves, and adjacent blocking structures are provided at a distance from each other. [Effects of the Invention]

[0015] As can be seen from the above, the battery pack provided by the present invention has a blocking structure in the exhaust passage of the case, which blocks particles in the gas that is emitted from the battery cell when the battery cell experiences thermal runaway, preventing the particles from continuing to flow into the battery pack along with the gas. This prevents the particles from adversely affecting equipment inside the battery pack or clogging the case explosion-proof valve, and prevents gas explosion and heat diffusion problems from occurring in the battery pack. [Brief explanation of the drawings]

[0016] In order to more clearly describe the technical solutions of the present invention or related art, the following briefly describes the drawings that need to be used in the description of the embodiments or related art. The drawings described below are only embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without any creative work.

[0017] [Figure 1] 1 is a schematic diagram of a partial structure of a battery pack according to an embodiment of the present invention. [Figure 2]1 is a schematic top view of a partial structure of a battery pack according to an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along the line AA in FIG. 2. [Figure 4] 3 is a schematic bottom view of a first battery cell end face of a battery cell of a battery pack according to one embodiment of the present invention. FIG. [Figure 5] FIG. 3 is a schematic cross-sectional view taken along the line BB in FIG. 2. [Figure 6] FIG. 3 is a cross-sectional schematic view of a second structure taken along the AA cross section of FIG. 2. [Figure 7] 3 is a cross-sectional schematic view of the second structure of FIG. 2 taken along the cross section BB. [Figure 8] FIG. 10 is a schematic top view of a case of a second structure of a battery pack according to one embodiment of the present invention. [Figure 9] 10 is a schematic three-dimensional view of a case of a second structure of a battery pack according to an embodiment of the present invention. FIG. [Figure 10] 1 is a schematic three-dimensional view of a case of a first structure of a battery pack according to an embodiment of the present invention. [Figure 11] 1 is a schematic top view of a case of a first structure of a battery pack according to an embodiment of the present invention. [Figure 12] FIG. 12 is a schematic cross-sectional view of the CC cross section of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understandable, the present invention will be described in more detail below in combination with specific embodiments and with reference to the drawings.

[0019] It should be noted that the relative arrangement of components, numerical expressions, and numerical values ​​described in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0020] At the same time, it should be understood that for the sake of convenience, the sizes of the parts shown in the drawings are not drawn according to their actual proportions.

[0021] The following description of at least one exemplary embodiment is merely exemplary in nature and is not intended to limit the invention and its application or uses.

[0022] Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention shall have the ordinary meanings understood by those skilled in the art. The terms "first," "second," and similar terms used in the embodiments of the present invention do not denote order, quantity, or importance, but are used only to distinguish between different components. Similar terms such as "comprises" and "has" mean that the element or thing preceding the term includes the element or thing listed thereafter and their equivalents, but does not exclude other elements or things. Similar terms such as "connected" and "coupled" are not limited to physical or mechanical connections, but also include electrical connections, whether direct or indirect. Terms such as "top," "bottom," "left," and "right" are used only to indicate relative positions, and if the absolute position of the described object changes, the relative positions may also change accordingly.

[0023] 1, which shows a partial structural three-dimensional schematic view of a battery pack. The battery pack includes a case 100, which includes a bottom plate 10 and four side plates 20 connected to edges of the bottom plate 10, and the bottom plate 10 and the four side plates 20 define an accommodating space 30 located inside the case 100. The battery pack further includes a plurality of battery cells 210 mounted in the accommodating space 30, and the battery cells 210 may be cylindrical battery cells.

[0024] Referring to Figure 2, Figure 2 shows a top view of a partial structure of a battery pack. Taking the structure shown in Figure 2 as an example, a plurality of battery cells 210 can form a plurality of battery cell arrays 200, and the plurality of battery cell arrays 200 are distributed along the width direction of the case 100 (such as the X direction in Figure 2). Each battery cell array 200 includes a plurality of battery cells 210 distributed along the length direction of the case 100 (such as the Y direction in Figure 2). To improve the space utilization rate of the accommodation space 30, adjacent battery cell arrays 200 can be arranged in a staggered manner.

[0025] Referring to Fig. 1, a case explosion-proof valve 21 is provided on the side plate 20 of the case 100. Referring to Fig. 3, Fig. 3 shows a schematic cross-sectional view of the AA section of Fig. 2. When the battery cell 210 is a cylindrical battery cell 210, the 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 case 100. When the battery cell 210 experiences thermal runaway, the case explosion-proof valve 21 opens, and the thermal runaway gas ejected from the battery cell explosion-proof valve 211 flows toward the case explosion-proof valve 21, accompanied by particles. After the thermal runaway gas flows into the case explosion-proof valve 21, some of the gas passes through the case explosion-proof valve 21 and is discharged outside the case 100, but at least some of the particles cannot pass through the case explosion-proof valve 21, and these particles block the case explosion-proof valve 21, making it difficult for subsequent gas to pass through the case explosion-proof valve 21 and be discharged outside the case 100, which may result in gas explosion problems and thermal diffusion (TP) problems inside the battery pack.

[0026] Taking this into consideration, and referring to FIG. 3, one embodiment of the present invention provides a battery pack including a case 100 having an exhaust passage 400, a plurality of battery cells 210, all of which are arranged within the case 100 and suitable for exhaust gas to pass through the exhaust passage 400 and be exhausted to the outside of the case 100, and a blocking structure 300 arranged in the exhaust passage 400 and having a blocking surface 310 that blocks particles from being mixed into the gas exhausted from the battery cells 210.

[0027] For example, the exhaust passage 400 may be formed by the structure of the case 100 itself, or may be formed by the case 100 and a structural member attached to the inside of the case 100.

[0028] For example, the isolation structure 300 may be connected to the battery cell 210 or to the case 100 of the battery pack, thereby fixing the isolation structure 300 within the battery pack.

[0029] For example, the start 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 case explosion-proof valve 21 .

[0030] For example, the blocking structure 300 may be a block-like structure, a tubular structure, a plate-like structure, or a column-like structure.

[0031] For example, the blocking surface 310 may be any surface of the blocking structure 300. For example, if the blocking structure 300 is a block-shaped structure, the blocking surface 310 may be a sidewall surface or a top surface; if the blocking structure 300 is a tubular structure, the blocking surface 310 may be an outer peripheral surface, an inner peripheral surface, or an end surface.

[0032] For example, blocking surface 310 may be a smooth surface, a surface provided with microstructures (eg, depressions or protrusions), or a surface connected to an intermediate layer (eg, an adhesive layer, a mesh layer, or a wool layer).

[0033] If the battery cell 210 experiences thermal runaway, gas emitted from the battery cell 210 flows along the exhaust passage 400 to the outside of the case 100, carrying particles with it. As the gas passes through the blocking structure 300 provided in the exhaust passage 400, the blocking surface 310 of the blocking structure 300 blocks the particles in the gas, preventing the particles from continuing to flow with the gas, and at least some of the particles adhere to or accumulate on the blocking surface 310. The gas then continues to flow through or bypass the blocking structure 300, and is eventually discharged to the outside of the case 100.

[0034] The battery pack provided in the embodiment of the present invention has a blocking structure 300 in the exhaust passage 400 of the case 100, which blocks particles in the gas emitted from the battery cell 210 when the battery cell 210 experiences thermal runaway, preventing the particles from continuing to flow into the case 100 along with the gas. This prevents the particles from adversely affecting equipment within the battery pack or clogging the case explosion-proof valve 21, and prevents gas explosion and heat diffusion problems from occurring in the battery pack.

[0035] Referring to Figure 3, in some embodiments, the case 100 has a case explosion-proof valve 21, the battery cell 210 has a battery cell explosion-proof valve 211, and the gas is suitable to flow out of the case 100 from the case explosion-proof valve 211 and into the exhaust passage 400 before being discharged to the outside of the case 100 through the case explosion-proof valve 21, the flow path through which the gas flows from the battery cell explosion-proof valve 211 to the case explosion-proof valve 21 is defined as a first flow path (the direction in which the gas flows is the direction indicated by the dotted arrow in Figure 3), and along the first flow path, the side wall surface of the blocking structure 300 facing upstream of the gas is configured as a blocking surface 310.

[0036] For example, the surface area of ​​the blocking surface 310 is smaller than the surface area of ​​the other side walls of the blocking structure 300. For example, if the blocking structure 300 is a plate-like structure, the plate surface of the plate-like structure can be the blocking surface 310.

[0037] Gas flows from the battery cell explosion-proof valve 211 to the case explosion-proof valve 21, with the side of the blocking structure 300 closest to the battery cell explosion-proof valve 211 being the upstream side of the gas, and the side of the blocking structure 300 closest to the case explosion-proof valve 21 being the downstream side of the gas. When the gas reaches the blocking structure 300, it preferentially comes into contact with the upstream blocking surface 310. Due to the blocking effect of the blocking surface 310, the gas flow rate is reduced and particles carried by the gas settle on the blocking surface 310, achieving the purpose of blocking the particles in the gas discharged from the battery cell explosion-proof valve 211.

[0038] 3, in some embodiments, the surface on which the battery cell explosion-proof valve 211 is located is defined as the first battery cell end face 212, and the orthogonal projection of the first battery cell end face 212 on the blocking surface 310 corresponding to the battery cell explosion-proof valve 211 is defined as the blocking surface projection 500. Referring to FIG. 4, FIG. 4 shows a schematic bottom view of the first battery cell end face 212. At least a portion of the battery cell explosion-proof valve 211 is located upstream of the blocking surface projection 500 along the first flow path (the gas flows in the direction of the dotted arrow in FIG. 4).

[0039] Combining the above, the battery cell explosion-proof valve 211 is the starting point of the first flow path, and the blocking surface 310 blocks the gas in the first flow path, thereby blocking particles in the gas. Since the blocking surface 310 can only block gas flowing from upstream to the blocking surface 310 along the first flow path, it is clear that at least a portion of the battery cell explosion-proof valve 211 must be located upstream of the blocking surface 310. In other words, the blocking surface 310 can block gas that erupts from the portion of the battery cell explosion-proof valve 211 located upstream of the blocking surface 310. Furthermore, it is difficult for the portion of the battery cell explosion-proof valve 211 located downstream of the blocking surface 310 to achieve a blocking effect.

[0040] Referring to FIG. 4, in some embodiments, along the first flow path, the battery cell explosion prevention valve 211 does not overlap the blocking surface projection 500.

[0041] For example, the blocking surface 310 is close to the battery cell explosion prevention valve 211 and blocks gas-borne particles at an initial location close to the first flow path, reducing the impact of the particles on other devices in the battery pack.

[0042] In order to improve the blocking effect of the blocking surface 310, the gas flow rate passing through the blocking surface 310 can be increased. Therefore, the entire battery cell explosion-proof valve 211 corresponding to the blocking surface 310 must be located upstream of the blocking surface 310, and the gas emitted from the battery cell explosion-proof valve 211 will pass through the blocking surface 310 as it flows along the first flow path, so that the blocking surface 310 blocks all the gas emitted from the battery cell explosion-proof valve 211 and increases the amount of particles carried by the gas that the blocking surface 310 blocks.

[0043] Referring to FIG. 3, in some embodiments, blocking surface 310 is planar.

[0044] By designing the blocking surface 310 as a flat surface, the structural complexity of the blocking structure 300 can be reduced, contributing to cost reduction, while ensuring that the blocking structure 300 has a blocking effect on flowing gas particles.

[0045] Referring to FIG. 5, FIG. 5 shows a schematic cross-sectional view of the cross section BB of FIG.

[0046] For example, the vertical centerline of the isolation structure 300 (eg, the dashed-dotted line in FIG. 5) and the vertical centerline of the corresponding battery cell 210 lie in the same vertical plane.

[0047] For example, the width of the blocking surface 310 (the dimension of the blocking structure 300 in the X direction in FIG. 5 ) may be slightly smaller than the diameter of the battery cell explosion-proof valve 211, or may be equal to or larger than the diameter of the battery cell explosion-proof valve 211. The width of the blocking 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.

[0048] For example, the sidewalls along the width direction of the blocking structure 300 may be vertical sidewalls.

[0049] Referring to Figure 6, Figure 6 shows a cross-sectional schematic view of the second structure of the battery pack taken along section AA in Figure 2. In some embodiments, the blocking surface 310 is a concave curved surface.

[0050] The blocking surface 310 is designed to be a curved surface concave toward the inside of the blocking structure 300, which increases the surface area of ​​the blocking surface 310 and improves the blocking effect of the blocking surface 310 against particles in gas. Meanwhile, the inwardly concave curved surface can gather particles in the center of the blocking surface 310 and prevent the particles from moving along the surface of the blocking surface 310 to the edges, which can help prevent the particles from leaving the blocking surface 310.

[0051] Referring to FIG. 7, FIG. 7 shows a cross-sectional schematic view of the second structure of the battery pack taken along the line BB in FIG.

[0052] For example, the blocking structure 300 has curved sidewalls along its width.

[0053] The blocking surface 310 may be curved in only one direction. Refer to FIG. 8, which shows a schematic top view of the case 100 of the second structure. In some embodiments, the blocking surface 310 of the blocking structure 300 is curved with a straight line in a first direction (such as the Z direction in FIG. 8) as its axis, and the first direction is the height direction of the battery cell 210. For example, the blocking surface 310 is curved from both ends toward the center. In this embodiment, the blocking surface 310 is curved laterally, which can effectively increase the lateral surface area of ​​the blocking surface 310.

[0054] Alternatively, referring to FIG. 6, in some embodiments, when the blocking surface 310 is a concave curved surface, the blocking surface 310 is curved with a straight line in a second direction (such as the X direction in FIG. 6) as an axis, and the second direction intersects with the first direction.

[0055] For example, the second direction and the first direction are perpendicular.

[0056] In this embodiment, the blocking surface 310 is curved in the vertical direction, which can effectively increase the vertical surface area of ​​the blocking surface 310.

[0057] Of course, the blocking surface 310 may be curved vertically or horizontally, i.e., may be a concave spherical curved surface, which can further increase the surface area of ​​the blocking surface 310 and contribute to further improving the blocking effect of particles in gas.

[0058] Referring to FIG. 6 , in some embodiments, the battery cell explosion-proof valve 211 faces the inner bottom surface of the case 100, the inner bottom surface of the case 100 is spaced apart from the battery cell explosion-proof valve 211, an exhaust passage 400 is defined between the battery cell explosion-proof valve 211 and the inner bottom surface of the case 100, and the blocking structure 300 is connected to the inner bottom surface of the case 100.

[0059] 9, which shows a schematic three-dimensional view of the second structure of the case 100. The insulating structure 300 is connected to the inner bottom surface of the case 100.

[0060] For example, the isolation structure 300 can be connected to the inside bottom surface of the case 100 by adhesive, welding, inserting, fastening, fastening connection, or integrally molded connection.

[0061] Generally, when gas flows through exhaust passage 400, particles carried by the gas are forced by gravity to the lower layer of the gas, i.e., near the inner bottom surface of case 100. In this embodiment, blocking structure 300 is connected to the inner bottom surface of case 100, and is located in the gas layer where the concentration of particles in the gas is high, contributing to improving the blocking effect of particles in the gas. Meanwhile, since blocking structure 300 is connected to the inner bottom surface of case 100, there is no gap between blocking structure 300 and the inner bottom surface of case 100, which contributes to keeping particles deposited on the inner bottom surface of case 100 in place on blocking surface 310 and prevents the deposited particles from moving again due to the action of gas that arrives later.

[0062] 10, which shows a three-dimensional schematic view of the first structure case 100. In some embodiments, the blocking surface 310 is inclined toward the upstream side of the gas.

[0063] For example, the inclination angle of the blocking surface 310 (i.e., the angle between the blocking surface 310 and the inner bottom surface of the case 100) can be designed according to the specific structure of the battery cell 210 and / or the battery pack, and is not limited here.

[0064] Taking the structure and direction shown in FIG. 3 as an example, gas flows along the first flow path from upstream (i.e., the left side of blocking surface 310) through blocking surface 310 toward downstream (i.e., the right side of blocking surface 310). When the gas reaches blocking surface 310, blocking surface 310 is inclined toward the upstream side of the gas. Therefore, after the particles in the gas are blocked by blocking surface 310, they move along inclined blocking surface 310 toward the inner bottom surface of case 100. This contributes to improving the settling efficiency of the particles in the gas and prevents the accumulated particles from moving again due to the action of gas that arrives later.

[0065] 3, in some embodiments, the battery pack includes a support member 600 for supporting and arranging the battery cells 210, at least a portion of which is disposed between the first battery cell end face 212 and the inner bottom surface of the case 100, and the support member 600 is provided with exhaust holes 610 corresponding to the battery cell explosion-proof valves 211, which extend through the support member 600 so that gas discharged from the battery cell explosion-proof valves 211 can pass through the exhaust holes 610 and enter the exhaust passage 400. The top of the blocking structure 300 is spaced apart from the support member 600 along a direction perpendicular to the inner bottom surface of the case 100 (such as the Z direction in FIG. 3).

[0066] For example, the first battery cell end surface 212 of the battery cell 210 can be connected to the support member 600 by adhesive bonding.

[0067] For example, a groove for positioning the battery cell 210 is provided on the surface of the support member 600 away from the inner bottom surface of the case 100, and an exhaust hole 610 is provided at the bottom of the groove.

[0068] For example, the support member 600 can be fixed in position within the accommodation space 30 by abutting against the inner bottom surface of the case 100 or against a protruding structure provided on the inner side wall of the case 100.

[0069] The top of the blocking structure 300 and the support member 600 are spaced apart, forming a gap between the two through which gas can flow, which helps gas emitted from the battery cell explosion-proof valve 211 to flow smoothly into the case 100 and ultimately be discharged from the case 100.

[0070] Combining the above, the particle concentration is high in the lower layer of the gas flowing through the exhaust passage 400, and low in the upper layer. As can be seen from Figure 3, the gap corresponds to the upper layer of the gas, and therefore does not significantly affect the effect of blocking particles in the gas.

[0071] 11, which shows a schematic top view of the first structure case 100. In some embodiments, a plurality of isolation structures 300 are provided, each of which corresponds to at least one battery cell explosion-proof valve 211.

[0072] Generally, referring to FIG. 3, each battery cell 210 has one battery cell explosion-proof valve 211, that is, the number of the isolation structures 300 is equal to or less than the number of the battery cells 210.

[0073] Furthermore, when one blocking structure 300 corresponds to two battery cell explosion-proof valves 211, for example, the two battery cell explosion-proof valves 211 may be located upstream of the blocking structure 300 along the first flow path, and the gas emitted from the two battery cell explosion-proof valves 211 will all pass through the blocking structure 300 as it flows along the first flow path, and all particles in the gas emitted from the two battery cell explosion-proof valves 211 can be blocked by the blocking surface 310.

[0074] Referring to FIG. 11, adjacent blocking structures 300 are spaced apart.

[0075] By arranging two adjacent blocking structures 300 at a distance from each other, a gap through which gas can flow can be formed between the two adjacent blocking structures 300, which helps to smoothly flow the gas ejected from the battery cell explosion-proof valve 211 into the case 100 and ultimately to be discharged from the case 100.

[0076] The vertical height of the blocking structure 300 protruding from the inner bottom surface of the case 100 can be designed according to the structure of the case 100, and is not limited here.

[0077] 6 and 12, Fig. 12 shows a schematic cross-sectional view of the CC cross section of Fig. 11. For example, the vertical height of the blocking structure 300 can be determined according to the installation position of the case explosion-proof valve 21 on the side panel 20, and generally, the vertical height of the blocking structure 300 is not higher than the center height of the case explosion-proof valve 21 to avoid the blocking structure 300 causing a significant obstruction to the exhaust of the case 100.

[0078] It should be noted that the above describes several embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than the embodiments described above and still achieve desirable results. Also, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve desirable results. In some embodiments, multitasking or parallel processing may also be possible or advantageous.

[0079] Each embodiment of the present invention will be described in a step-by-step manner, with emphasis on the differences between each embodiment and other embodiments, and reference may be made to the same or similar parts between the embodiments.

[0080] The description of the present invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and changes will be apparent to those skilled in the art. The embodiments have been chosen and described to better explain the principles and practical applications of the invention and to enable others skilled in the art to understand the invention and to design various embodiments with various modifications to suit particular uses.

[0081] Those skilled in the art should understand that the description of any of the above embodiments is merely illustrative and does not imply that the scope of the present invention (including the claims) is limited to these examples. In accordance with the concept of the present invention, the technical features of the above embodiments or different embodiments can be combined, steps can be performed in any order, and there are many other variations in different aspects of the above embodiments of the present invention, which are not described in detail for the sake of brevity.

[0082] While the present invention has been described in conjunction with specific embodiments thereof, many permutations, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0083] The embodiments of the present invention are intended to include all replacements, modifications, and variations that fall within the broad scope of the appended claims. Therefore, all omissions, modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present invention should also be included in the protection scope of the present invention. [Industrial Applicability]

[0084] The battery pack of the present invention has a blocking structure in the exhaust passage of the case, which blocks particles in the gas emitted from the battery cell when the battery cell experiences thermal runaway, preventing the particles from continuing to flow into the case along with the gas. This prevents the particles from adversely affecting equipment inside the battery pack or blocking the case explosion-proof valve, and prevents gas explosion and heat diffusion problems from occurring in the battery pack. [Explanation of symbols]

[0085] 100 cases 10 Bottom plate 20 Side Panel 21 Case explosion-proof valve 30 Containment Space 200 battery cell array 210 battery cells 211 Battery cell explosion prevention valve 212 First battery cell end face 300 Blocking structure 310 Blocking Surface 400 exhaust passage 500 Blocking Surface Projection 600 Support member 610 Exhaust vent

Claims

1. a case having an exhaust passage; a plurality of battery cells, each of which is disposed within the case, adapted to allow exhaust gas to pass through the exhaust passage and be exhausted to the outside of the case; a blocking structure provided in the exhaust passage and having a blocking surface that blocks particles from entering the gas discharged from the battery cell; A battery pack comprising:

2. the case has a case explosion-proof valve, the battery cell has a battery cell explosion-proof valve, the gas flows from the battery cell explosion-proof valve to the exhaust passage, and then is discharged to the outside of the case from the case explosion-proof valve, and a flow path through which the gas flows from the battery cell explosion-proof valve to the case explosion-proof valve is defined as a first flow path; The battery pack according to claim 1 , wherein a sidewall surface of the blocking structure facing upstream of the gas along the first flow path is configured as the blocking surface.

3. a surface on which the battery cell explosion-proof valve is located is defined as a first battery cell end surface, and an orthogonal projection of the blocking surface corresponding to the battery cell explosion-proof valve on the first battery cell end surface is defined as a blocking surface projection; The battery pack according to claim 2 , wherein at least a portion of the battery cell explosion-proof valve is located upstream of the cutoff surface projection along the first flow path.

4. The battery pack according to claim 3 , wherein the battery cell explosion-proof valve does not overlap the cutoff surface projection along the first flow path.

5. 3. The battery pack according to claim 2, wherein the blocking surface is a flat surface or a concave curved surface.

6. The surface on which the battery cell explosion-proof valve is located is defined as a first battery cell end surface, When the blocking surface is a concave curved surface, the blocking surface is curved around an axis that is a straight line in a first direction, and the first direction is a height direction of the battery cell; and / or 6. The battery pack according to claim 5, wherein the blocking surface is curved about an axis that is a straight line in a second direction, and the second direction intersects with the first direction.

7. 3. The battery pack according to claim 2, wherein the battery cell explosion-proof valve faces an inner bottom surface of the case, the inner bottom surface of the case is spaced apart from the battery cell explosion-proof valve, the exhaust passage is defined between the battery cell explosion-proof valve and the inner bottom surface of the case, and the blocking structure is connected to the inner bottom surface of the case.

8. 8. The battery pack according to claim 7, wherein the blocking surface is inclined toward the upstream side of the gas.

9. The surface on which the battery cell explosion-proof valve is located is defined as a first battery cell end surface, The case further includes a support member for supporting and arranging the battery cells, at least a portion of the support member being disposed between an end face of the first battery cell and an inner bottom surface of the case, and the support member is provided with exhaust holes corresponding to the battery cell explosion-proof valves, the exhaust holes penetrating the support member, and gas discharged from the battery cell explosion-proof valves can pass through the exhaust holes and enter the exhaust passage; 8. The battery pack according to claim 7, wherein a top of the blocking structure is spaced apart from the support member along a direction perpendicular to the inner bottom surface of the case.

10. 8. The battery pack according to claim 7, wherein a plurality of the blocking structures are provided, each of the blocking structures corresponding to at least one of the battery cell explosion-proof valves, and adjacent blocking structures are provided at a distance from each other.

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