Battery pack

Abstract

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 blocking the case explosion-proof valve, and prevents gas explosion and heat diffusion problems from occurring in the battery pack. [Solution] The present invention provides a battery pack comprising a case having an exhaust passage, a plurality of battery cells all arranged within the case and suitable for exhaust gas to pass through the exhaust passage and be discharged outside the case, and a blocking structure arranged in the exhaust passage and having a blocking surface that blocks particles from being mixed into the gas exhausted from the battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and particularly to battery packs.

Background Art

[0002] In related technologies, a conventional battery pack includes a conventional case and a plurality of battery cells mounted inside the conventional case, and each battery cell has a battery cell explosion-proof valve. When thermal runaway occurs in the battery cell, the battery cell explosion-proof valve ejects thermal runaway gas to the outside. However, the thermal runaway gas ejected from the battery cell explosion-proof valve also carries solid particles inside the battery cell, and these particles flow into the conventional case together with the thermal runaway gas, which is likely to have an adverse effect on other devices in the conventional case and is likely to block the case explosion-proof valve.

[0003] Therefore, how to reduce the adverse effects of the particles ejected from the battery cell explosion-proof valve on the battery pack has become an urgent problem to be solved.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a battery pack that prevents the occurrence of gas explosion and heat diffusion problems.

Means for Solving the Problems

[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 provided inside the case and suitable for the discharged gas to pass through the exhaust passage and be discharged outside the case; and a blocking structure provided in the exhaust passage and having a blocking surface for blocking particles mixed in the gas discharged 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 from the battery cell explosion-proof valve, flow into the exhaust passage, and then be discharged outside 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 the first flow path, and along the first flow path, the side wall surface of the shut-off structure facing upstream of the gas is configured as the shut-off surface.

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

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

[0009] In one embodiment of the present invention, the blocking surface is a flat or 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 first battery cell end face, and when the shut-off surface is a concave curved surface, the shut-off surface is curved about an axis of a straight line in a first direction, the first direction being the height direction of the battery cell, and / or the shut-off surface is curved about an axis of a straight line in a second direction, the second direction intersecting 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 shut-off 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 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 the first battery cell end face, and the present invention further includes a support member for supporting and arranging the battery cell, at least a portion of the support member is provided between the first battery cell end face and the inner bottom surface of the case, the support member is provided with exhaust holes corresponding to the battery cell explosion-proof valves, the exhaust holes penetrate the support member, and gas discharged from the battery cell explosion-proof valve can pass through the exhaust holes and enter the exhaust passage, and the top of the shut-off structure is provided spaced apart from the support member in a direction perpendicular to the inner bottom surface of the case.

[0014] In one embodiment of the present invention, a plurality of the shut-off structures are provided, each of the shut-off structures corresponds to at least one of the battery cell explosion-proof valves, and adjacent shut-off structures are provided spaced apart. [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 ejected from the battery cells when the battery cells experience thermal runaway, preventing the particles from continuing to flow into the battery pack along with the gas. This prevents the particles from adversely affecting the equipment inside the battery pack or blocking the case explosion-proof valve, thereby preventing gas explosion and heat diffusion problems from occurring in the battery pack. [Brief explanation of the drawing]

[0016] To more clearly explain the technical concepts in the present invention or related technologies, the drawings that need to be used in the description of embodiments or related technologies are briefly described below. The drawings described below are merely embodiments of the present invention, and it will be obvious to those skilled in the art that other drawings can be obtained based on these drawings without any creative work.

[0017] [Figure 1] This is a schematic diagram of a partial structure of a battery pack according to one embodiment of the present invention. [Figure 2]It is a schematic top view of a partial structure of a battery pack according to an embodiment of the present invention. [Figure 3] It is a schematic cross-sectional view of the A-A cross-section of FIG. 2. [Figure 4] It is a schematic bottom view of the first battery cell end face of a battery cell of a battery pack according to an embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view of the B-B cross-section of FIG. 2. [Figure 6] It is a schematic cross-sectional view of the second structure of the A-A cross-section of FIG. 2. [Figure 7] It is a schematic cross-sectional view of the second structure of the B-B cross-section of FIG. 2. [Figure 8] It is a schematic top view of a case of the second structure of a battery pack according to an embodiment of the present invention. [Figure 9] It is a schematic perspective view of a case of the second structure of a battery pack according to an embodiment of the present invention. [Figure 10] It is a schematic perspective view of a case of the first structure of a battery pack according to an embodiment of the present invention. [Figure 11] It is a schematic top view of a case of the first structure of a battery pack according to an embodiment of the present invention. [Figure 12] It is a schematic cross-sectional view of the C-C cross-section of FIG. 11.

Embodiments for Carrying Out the Invention

[0018] In order to more clearly understand the object, technical solution and advantages of the present invention, the present invention will be further described in detail below in combination with specific embodiments and with reference to the drawings.

[0019] Note that the relative arrangements, numerical expressions and numerical values of the components described in these embodiments do not limit the scope of the present invention unless specifically described.

[0020] At the same time, for convenience of explanation, it should be understood that the sizes of each part shown in the drawings are not drawn according to the actual ratio relationship.

[0021] The following description of at least one exemplary embodiment is for illustrative purposes only and is not intended to limit the invention or its applications 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 are not intended to indicate order, quantity, or importance, but are used solely to distinguish different components. Similar terms such as “includes” and “equip” mean that the element or thing preceding the term includes the elements or things listed after the term and their equivalents, but do not exclude other elements or things. Similar terms such as “connected” and “joined” include electrical connections, whether direct or indirect, and are not limited to physical or mechanical connections. Terms such as “up,” “down,” “left,” and “right” are used solely to indicate relative positional relationships, and if the absolute position of the object being described changes, its relative positional relationship may change accordingly.

[0023] Referring to Figure 1, Figure 1 shows a schematic three-dimensional diagram of a partial structure of a battery pack. The battery pack comprises a case 100, which comprises 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 define a housing space 30 located inside the case 100. The battery pack further comprises a plurality of battery cells 210 installed in the housing space 30, and the battery cells 210 may be cylindrical battery cells.

[0024] Referring to Figure 2, which shows a top view of a partial structure of a battery pack. Using the structure shown in Figure 2 as an example, multiple battery cells 210 can form multiple battery cell arrays 200, and these battery cell arrays 200 are distributed along the width direction of the case 100 (e.g., the X direction in Figure 2). Each battery cell array 200 comprises multiple battery cells 210 distributed along the length direction of the case 100 (e.g., the Y direction in Figure 2). To increase the space utilization rate of the housing space 30, adjacent battery cell arrays 200 can be arranged in an alternating pattern.

[0025] Referring to Figure 1, a case explosion-proof valve 21 is provided on the side plate 20 of the case 100. Referring to Figure 3, Figure 3 shows a schematic cross-sectional view of section AA in Figure 2. If 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 case 100. If the battery cell 210 experiences thermal runaway, the case explosion-proof valve 21 opens, and the runaway thermal gas ejected from the battery cell explosion-proof valve 211 flows toward the case explosion-proof valve 21, accompanied by particles. After the runaway thermal 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. However, at least some of the particles cannot pass through the case explosion-proof valve 21, and these particles block the valve 21. This makes it difficult for subsequent gas to pass through the case explosion-proof valve 21 and be discharged outside the case 100, potentially leading to gas explosion and thermal diffusive (TP) problems inside the battery pack.

[0026] With this in mind, referring to Figure 3, an embodiment of the present invention provides a battery pack comprising: a case 100 having an exhaust passage 400; a plurality of battery cells 210, all of which are provided within the case 100 and are suitable for the exhaust gas to pass through the exhaust passage 400 and be discharged outside the case 100; and a blocking structure 300 provided in the exhaust passage 400 and having a blocking surface 310 that blocks particles from mixing with the gas discharged from the battery cells 210.

[0027] For example, the exhaust passage 400 may be formed by the structure of the case 100 itself, or it may be formed by the case 100 and structural members installed inside the case 100.

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

[0029] For example, the starting point of the exhaust passage 400 may be the battery cell explosion-proof valve 211 of the battery cell 210, and the ending point may be the case explosion-proof valve 21.

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

[0031] For example, the blocking surface 310 may be any surface of the blocking structure 300. For instance, if the blocking structure 300 is a block-shaped structure, the blocking surface 310 may be a side wall surface or a top surface. If the blocking structure 300 is a tubular structure, the blocking surface 310 may be an outer circumferential surface, an inner circumferential surface, or an end surface.

[0032] For example, the barrier surface 310 may be a smooth surface, a surface with a microstructure (e.g., recesses or protrusions), or a surface connected to an intermediary layer (e.g., an adhesive layer, a mesh layer, or a wool layer).

[0033] If the battery cell 210 experiences thermal runaway, the gas ejected from the battery cell 210 flows out of the case 100 along the exhaust passage 400, accompanied by particles. As the gas passes through the shut-off structure 300 provided in the exhaust passage 400, the shut-off surface 310 of the shut-off structure 300 blocks the particles in the gas, preventing them from continuing to flow with the gas, and at least some of the particles adhere to or accumulate on the shut-off surface 310. The gas then continues to flow, passing through or bypassing the shut-off structure 300, and is eventually discharged outside the case 100.

[0034] In the embodiment of the present invention, the battery pack provided has a shut-off structure 300 in the exhaust passage 400 of the case 100. This structure prevents particles in the gas ejected 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 the equipment inside the battery pack or blocking the case explosion-proof valve 21, thereby preventing 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, and the battery cell 210 has a battery cell explosion-proof valve 211. The gas is suitable to flow out from the battery cell explosion-proof valve 211 into the exhaust passage 400 and then be discharged outside the case 100 from 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 the first flow path (the direction of gas flow is indicated by the dotted arrow in Figure 3), and along the first flow path, the side wall surface of the shut-off structure 300 facing upstream of the gas is configured as the shut-off surface 310.

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

[0037] The gas flows from the battery cell explosion-proof valve 211 to the case explosion-proof valve 21. The side of the shut-off structure 300 closest to the battery cell explosion-proof valve 211 is upstream of the gas, and the side of the shut-off structure 300 closest to the case explosion-proof valve 21 is downstream of the gas. When the gas reaches the shut-off structure 300, it preferentially contacts the shut-off surface 310 on the upstream side. Due to the shut-off effect of the shut-off surface 310, the gas flow rate decreases, and particles carried by the gas settle on the shut-off surface 310, thus achieving the objective of shutting off particles in the gas discharged from the battery cell explosion-proof valve 211.

[0038] Referring to Figure 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 orthographic projection of the first battery cell end face 212 of the shut-off surface 310 corresponding to the battery cell explosion-proof valve 211 is defined as the shut-off surface projection 500. Referring to Figure 4, Figure 4 shows a schematic bottom view of the first battery cell end face 212. Along the first flow path (the direction of gas flow is indicated by the dotted arrow in Figure 4), at least a portion of the battery cell explosion-proof valve 211 is located upstream of the shut-off surface projection 500.

[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 can block the gas in the first flow path and achieve the effect of blocking particles in the gas. Furthermore, since the blocking surface 310 can block only the gas flowing from upstream to the blocking surface 310 along the first flow path, it is clear that at least a part of the battery cell explosion-proof valve 211 needs to be located upstream of the blocking surface 310. In other words, the blocking surface 310 can produce the effect of blocking gas ejected from the part of the battery cell explosion-proof valve 211 located upstream of the blocking surface 310. On the other hand, it is difficult for the part of the battery cell explosion-proof valve 211 located downstream of the blocking surface 310 to produce a blocking effect.

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

[0041] For example, the blocking surface 310 is close to the battery cell explosion-proof valve 211, blocking particles carried by the gas at an initial position close to the first flow path, thereby reducing the impact of particles on other equipment within the battery pack.

[0042] To improve the blocking effect of the blocking surface 310, the gas flow rate passing through the blocking surface 310 can be increased. For this reason, the entire battery cell explosion-proof valve 211 corresponding to the blocking surface 310 must be positioned upstream of the blocking surface 310, and the gas ejected from the battery cell explosion-proof valve 211 must pass through the blocking surface 310 in the process of flowing along the first flow path, so that the blocking surface 310 blocks all the gas ejected from the battery cell explosion-proof valve 211, and the blocking surface 310 can block a greater amount of particles carried by the gas.

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

[0044] By designing the barrier surface 310 as a flat surface, it is possible to reduce the complexity of the barrier structure 300 and contribute to cost reduction, based on the assurance that the barrier structure 300 has a barrier effect against flowing gas particles.

[0045] Referring to Figure 5, Figure 5 shows a schematic cross-sectional view of the BB section in Figure 2.

[0046] For example, the vertical center line of the shielding structure 300 (e.g., the dashed line in Figure 5) and the corresponding vertical center line of the battery cell 210 lie in the same vertical plane.

[0047] For example, the width of the shut-off surface 310 (the dimension in the X direction in Figure 5 of the shut-off structure 300) may be slightly smaller than the diameter of the battery cell explosion-proof valve 211, or it may be equal to the diameter of the battery cell explosion-proof valve 211, or it may be larger than the diameter of the battery cell explosion-proof valve 211. The width of the shut-off surface 310 can be designed according to the specific structure of the battery cell 210 and / or battery pack, and is not limited thereto.

[0048] For example, the side walls along the width direction of the barrier structure 300 may be vertical side walls.

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

[0050] The barrier surface 310 is designed as a curved surface that is concave inward towards the barrier structure 300, thereby increasing the surface area of ​​the barrier surface 310 and improving the barrier effect of the barrier surface 310 on particles in the gas. On the other hand, the inwardly concave curved surface can collect particles in the center of the barrier surface 310, preventing particles from moving along the surface of the barrier surface 310 to the edges, and can help prevent particles from separating from the barrier surface 310.

[0051] Referring to Figure 7, Figure 7 shows a schematic cross-sectional view of the second structure of the BB cross-section of the battery pack in Figure 2.

[0052] For example, the barrier structure 300 is a side wall that curves along the widthwise side wall.

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

[0054] Alternatively, referring to Figure 6, in some embodiments, if the barrier surface 310 is a concave curved surface, the barrier surface 310 is curved about a straight line in a second direction (such as the X direction in Figure 6) as its axis, and the second direction intersects the first direction.

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

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

[0057] Naturally, the barrier surface 310 may be curved vertically or horizontally; in other words, the barrier surface 310 may be a concave spherical curved surface. This allows for an even larger surface area of ​​the barrier surface 310, which can contribute to further improving the barrier effect against particles in the gas.

[0058] Referring to Figure 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 a shut-off structure 300 is connected to the inner bottom surface of the case 100.

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

[0060] For example, the shielding structure 300 can be connected to the inner bottom surface of the case 100 by methods such as bonding, welding, insertion, fastening, clamping, or integral molding.

[0061] Generally, when gas flows through the exhaust passage 400, particles carried by the gas are located in the lower layer of the gas, i.e., near the inner bottom surface of the case 100, due to the action of gravity. In this embodiment, the barrier structure 300 is connected to the inner bottom surface of the case 100 and is located in the gas layer where the concentration of particles in the gas is high, contributing to an improved barrier effect against particles in the gas. On the other hand, since the barrier structure 300 is connected to the inner bottom surface of the case 100, there is no gap between the barrier structure 300 and the inner bottom surface of the case 100, which helps to hold particles accumulated on the inner bottom surface of the case 100 in place at the barrier surface 310, and prevents the accumulated particles from moving again due to the action of gas that arrives later.

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

[0063] For example, the inclination angle of the cutoff surface 310 (i.e., the angle between the cutoff 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 battery pack, and is not limited thereto.

[0064] Using the structure and direction shown in Figure 3 as an example, along the first flow path, the gas flows from upstream (i.e., the left side of the barrier surface 310) through the barrier surface 310 to downstream (i.e., the right side of the barrier surface 310). When the gas reaches the barrier surface 310, because the barrier surface 310 is inclined toward the upstream direction of the gas, the particles in the gas are blocked by the barrier surface 310 and then move along the inclined barrier surface 310 toward the inner bottom surface of the case 100. This contributes to improving the sedimentation 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] Referring to Figure 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 provided 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, the exhaust holes 610 passing through the support member 600, and 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 shut-off structure 300 is provided 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 Figure 3).

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

[0067] For example, a groove for positioning the battery cell 210 is provided on the surface of the support member 600 that is 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 place within the housing space 30 by contacting the inner bottom surface of the case 100 or a protruding structure provided on the inner side wall of the case 100.

[0069] The top of the shut-off structure 300 and the support member 600 are spaced apart, creating a gap between them through which gas can flow. This helps to smoothly guide the gas ejected from the battery cell explosion-proof valve 211 into the case 100 and ultimately discharge it from the case 100.

[0070] Furthermore, combining the above information, the gas flowing through the exhaust passage 400 has a high concentration of particles in the lower layer and a low concentration of particles in the upper layer. As can be seen from Figure 3, the gap mentioned above corresponds to the upper layer of the gas and therefore does not have a significant adverse effect on the effect of blocking particles in the gas.

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

[0072] Generally, as shown in Figure 3, each battery cell 210 has one battery cell explosion-proof valve 211, meaning that the number of shut-off structures 300 is less than or equal to the number of battery cells 210.

[0073] Furthermore, if one shut-off 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 shut-off structure 300 along the first flow path, and the gas ejected from the two battery cell explosion-proof valves 211 will both pass through the shut-off structure 300 in the process of flowing along the first flow path, so that all particles in the gas ejected from the two battery cell explosion-proof valves 211 can be shut off by the shut-off surface 310.

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

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

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

[0077] Referring to Figures 6 and 12, Figure 12 shows a schematic cross-sectional view of the CC cross section in Figure 11. For example, the vertical height of the shut-off structure 300 can be determined according to its installation position on the side plate 20 of the case explosion-proof valve 21. Generally, the vertical height of the shut-off structure 300 is not higher than the center height of the case explosion-proof valve 21 in order to avoid the shut-off structure 300 causing a major obstruction to the exhaust of the case 100.

[0078] The above describes some embodiments of the present invention. Other embodiments are within the scope of the attached claims. In some cases, the operations or steps described in the claims may be performed in a different order than those in the embodiments described above, and the desired results may still be achieved. Furthermore, the steps illustrated in the drawings do not necessarily require a specific order or sequence shown to obtain the desired results. In some embodiments, multitasking or parallel processing may be possible or advantageous.

[0079] Each embodiment of the present invention is described in a stepwise manner, with emphasis on the differences between each embodiment, and any identical or similar parts between embodiments may be referenced to one another.

[0080] The description of this invention is provided for illustrative and explanatory purposes only and is not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and changes will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the invention and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0081] Those skilled in the art should understand that the descriptions of the embodiments above are merely illustrative and do not imply that the scope of the invention (including the claims) is limited to these examples. Technical features of the embodiments described above or different embodiments can be combined in accordance with the concept of the invention, the steps can be carried out in any order, and many other variations exist in different aspects of the embodiments of the invention described above, but are not described in detail for the sake of brevity.

[0082] The present invention has been described by combining specific embodiments of the present invention, but from the above description, many substitutions, modifications, and variations of these embodiments will be obvious to those skilled in the art.

[0083] Embodiments of the present invention are intended to include all substitutions, modifications, and variations that fall within the broad scope of the attached claims. Accordingly, all omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present invention should also be included within the scope of protection of the present invention. [Industrial applicability]

[0084] The battery pack of the present invention, by providing a blocking structure in the exhaust passage of the case, can block particles in the gas ejected from the battery cells when the battery cells experience thermal runaway, preventing the particles from continuing to flow into the case with the gas. This prevents the particles from adversely affecting the equipment inside the battery pack or blocking the case's explosion-proof valve, thereby preventing gas explosion and heat diffusion problems from occurring in the battery pack. [Explanation of symbols]

[0085] 100 cases 10 Bottom plate 20 Side panels 21 Explosion-proof valves 30 Containment space 200 Battery Cell Array 210 battery cells 211 Battery cell explosion-proof valve 212 End face of the first battery cell 300 Shielding structure 310 Shielding surface 400 Exhaust passage 500 Projection of the barrier surface 600 Support member 610 Exhaust port

Claims

1. Cases with an exhaust passage, Each of the above-mentioned batteries is provided within the case and is suitable for the discharged gas to pass through the exhaust passage and be discharged outside the case, A blocking structure provided in the exhaust passage and having a blocking surface that blocks particles from mixing with the gas discharged from the battery cell, Equipped with, 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 from the battery cell explosion-proof valve, flow into the exhaust passage, and then be discharged outside the case from the case explosion-proof valve, and the flow path through which the gas flows from the battery cell explosion-proof valve to the case explosion-proof valve is defined as the first flow path. A battery pack characterized in that, along the first flow path, the side wall surface of the blocking structure facing upstream of the gas is configured as the blocking surface.

2. The surface on which the battery cell explosion-proof valve is located is defined as the first battery cell end face, and the orthographic projection of the shielding surface corresponding to the battery cell explosion-proof valve on the first battery cell end face is defined as the shielding surface projection. The battery pack according to claim 1, characterized in that at least a portion of the battery cell explosion-proof valve is located upstream of the projection of the shut-off surface along the first flow path.

3. The battery pack according to claim 2, characterized in that the battery cell explosion-proof valve does not overlap with the projection of the shut-off surface along the first flow path.

4. The battery pack according to claim 1, characterized in that the blocking surface is a flat or concave curved surface.

5. The surface on which the battery cell explosion-proof valve is located is defined as the first battery cell end face. If the blocking surface is a concave curved surface, the blocking surface is curved with a straight line in the first direction as its axis, and / or the first direction is the height direction of the battery cell, and / or The battery pack according to claim 4, characterized in that the blocking surface is curved with a straight line in the second direction as its axis, and the second direction intersects with the first direction.

6. The battery pack according to claim 1, characterized in that 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 shut-off structure is connected to the inner bottom surface of the case.

7. The battery pack according to claim 6, characterized in that the blocking surface is inclined toward the upstream of the gas.

8. The surface on which the battery cell explosion-proof valve is located is defined as the first battery cell end face. Furthermore, the case is provided with a support member for supporting and arranging the battery cells, at least a portion of which is provided between the end face of the first battery cell and the 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 penetrate the support member, and the gas discharged from the battery cell explosion-proof valves can pass through the exhaust holes and enter the exhaust passage. The battery pack according to claim 6, characterized in that the top of the shielding structure is provided spaced apart from the support member, along a direction perpendicular to the inner bottom surface of the case.

9. The battery pack according to claim 6, characterized in that a plurality of the shut-off structures are provided, each shut-off structure corresponds to at least one of the battery cell explosion-proof valves, and adjacent shut-off structures are provided spaced apart.

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