Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack which comprises a battery box and a battery pack, the battery box is provided with a reinforcing box wall, and the reinforcing box wall is provided with convex ribs; the battery pack is arranged in the battery box, an anti-explosion valve is arranged at one end, facing the reinforcing box wall, of the battery pack, and at least part of the orthographic projection of the anti-explosion valve on the reinforcing box wall is overlapped with the convex ribs; and the convex ribs protrude towards the direction far away from the battery pack. The battery pack provided by the utility model has relatively high structural strength and relatively high safety performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] Lithium-ion batteries, as efficient and high-energy-density energy storage devices, are widely used in electric vehicles, energy storage systems and other fields.

[0003] In existing technologies, lithium-ion battery packs include a battery box and a battery assembly housed within the battery box. The battery assembly comprises multiple individual battery cells, each equipped with an explosion-proof valve. When a battery cell experiences thermal runaway, it rapidly releases a large amount of high-temperature gas and particulate matter. This gas and particulate matter breaches the explosion-proof valve and impacts the battery box lid. Currently, the lid in existing technologies is a flat structure; the impact force from the high-temperature gas and particulate matter can cause the lid to rupture, releasing the gas and particulate matter outside the battery pack and affecting the normal operation of other battery cells. Therefore, the existing lid structure has low structural strength, resulting in lower battery pack safety.

[0004] Therefore, there is an urgent need for a battery pack with higher safety. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack to solve the technical problems of low structural strength and low safety box in the prior art.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] Battery pack, including:

[0008] A battery box having reinforced walls, the reinforced walls having ribs;

[0009] A battery pack is disposed inside the battery box, and the end of the battery pack facing the reinforced box wall has an explosion-proof valve. The orthographic projection of the explosion-proof valve on the reinforced box wall at least partially overlaps with the rib. The rib protrudes in a direction away from the battery pack.

[0010] The technical effects that the above technical solution can achieve are as follows:

[0011] The reinforced walls of the battery pack are equipped with ribs, which enhance the structural strength of the entire reinforced wall. When the explosion-proof valve is breached, the high-temperature gas and particles inside the battery pack will rush towards the ribs. The ribs buffer the impact of the high-temperature gas and particles, thereby reducing the risk of the reinforced wall being breached. This prevents the release of high-temperature gas and particles outside the battery pack. Therefore, the high-temperature gas and particles generated by thermal runaway of this battery pack will not cause the temperature of the environment in which the battery pack is located to rise. This ensures that thermal runaway of the battery pack will not affect the normal operation of other battery packs, thus improving the safety of the battery pack. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the first structure of a battery pack provided in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of a portion of the battery pack provided in one embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the first structure for reinforcing the box wall according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the second structure for reinforcing the box wall provided in one embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the third structure for reinforcing the box wall according to an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the second structure of a battery pack provided in one embodiment of the present invention.

[0019] In the picture:

[0020] 100. Battery box; 110. Reinforced box wall; 111. Rib; 120. Box body; 200. Battery pack; 210. Explosion-proof valve; 220. Terminal post. Detailed Implementation

[0021] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0022] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0026] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] This embodiment provides a battery pack that can reduce the impact on surrounding battery packs in the event of thermal runaway, thus providing high safety.

[0030] For example, such as Figure 1 As shown, the battery pack includes a battery box 100 and a battery pack 200. The battery pack 200 is located inside the battery box 100, and the battery box 100 limits the movement of the battery pack 200 to reduce the risk of the battery pack 200 shaking. The shape of the battery box 100 can be square or other shapes, and this embodiment does not limit it.

[0031] Please continue reading Figure 1 The battery box 100 has a reinforcing wall 110. The reinforcing wall 110 is a wall in the length or width direction of the battery box 100. The reinforcing wall 110 has ribs 111, which are used to enhance the structural strength of the reinforcing wall 110, thereby improving the structural strength of the entire battery box 100. In this embodiment, as... Figure 1 As shown, the rib 111 protrudes in a direction away from the battery pack 200.

[0032] In this embodiment, the battery pack 200 is disposed inside the battery box 100, and the end of the battery pack 200 facing the reinforced box wall 110 has an explosion-proof valve 210. The explosion-proof valve 210 is used to open when the battery of the battery pack 200 experiences thermal runaway, so as to discharge the internal pressure of the battery and the thermal runaway material from the inside of the battery casing to the outside of the casing.

[0033] In this embodiment, the orthographic projection of the explosion-proof valve 210 onto the reinforced housing wall 110 at least partially overlaps with the rib 111. That is, at least a portion of the explosion-proof valve 210 is directly opposite the rib 111 on the reinforced housing wall 110 in the thickness direction. Thus, the rib 111 enhances the structural strength of the entire reinforced housing wall 110. When the explosion-proof valve 210 is breached, the high-temperature gas and particles inside the battery pack 200 will rush towards the rib 111. The rib 111 buffers the impact force of the high-temperature gas and particles, thereby reducing the risk of the reinforced housing wall 110 being breached. This prevents the release of high-temperature gas and particles outside the battery pack. Therefore, the high-temperature gas and particles generated by the thermal runaway of the battery pack will not cause the temperature of the environment where the battery pack is located to rise, ensuring that the thermal runaway of the battery pack 200 will not affect the normal operation of other battery packs, thus improving the safety of the battery pack.

[0034] In one embodiment, the rib 111 and the reinforcing box wall 110 are separate structures, that is, the rib 111 and the reinforcing box wall 110 are fixedly connected. In this case, the thickness or size of the rib 111 can be set according to the required structural strength requirements, which provides high flexibility. For example, when the rib 111 and the reinforcing box wall 110 are separate structures, the rib 111 can be set on the surface of the reinforcing box wall 110 facing the battery pack 200, or the rib 111 can also be set on the surface of the reinforcing box wall 110 facing away from the battery pack 200. This embodiment does not limit this.

[0035] In other embodiments, the rib 111 and the reinforcing box wall 110 are an integral structure, which makes the reinforcing box wall 110 have higher structural strength and also facilitates the manufacturing of the rib 111.

[0036] For example, such as Figure 1 As shown, when the rib 111 and the reinforcing box wall 110 are an integral structure, the rib 111 is formed by stamping on the reinforcing box wall 110. That is, the rib 111 is formed by stamping on the reinforcing box wall 110, which facilitates the formation of the rib 111 and simplifies the operation. Of course, it is understood that the rib 111 and the reinforcing box wall 110 can also be formed by injection molding or other methods, which can also form an integral rib 111 and reinforcing box wall 110. This embodiment does not limit this.

[0037] In one possible implementation, the rib 111 extends away from the battery pack 200, that is, it extends outward from the battery box 100. This avoids occupying the internal space of the battery box 100, thus not affecting the height of the battery pack 200 and ensuring that the battery pack has a high energy density. Furthermore, by providing the outwardly protruding rib 111, when one battery in the battery pack 200 experiences thermal runaway, the high-temperature gas and particles that break through the explosion-proof valve 210 will enter the rib 111 and flow within it. This reduces the amount of high-temperature gas and particles diffusing to adjacent batteries, minimizing the impact on adjacent batteries and minimizing the impact of battery thermal runaway on the entire battery pack 200. Moreover, as the high-temperature gas flows within the rib 111, it exchanges heat with the rib 111, and its temperature gradually decreases. Therefore, the impact on other explosion-proof valves 210 opposite to the rib 111 is also minimal, resulting in high safety.

[0038] In other possible implementations, the rib 111 may also extend in the direction toward the battery pack 200 to adapt to application scenarios that require a certain overall height of the battery pack.

[0039] To ensure sufficient venting clearance between the reinforced casing 110 and the battery pack 200, in some optional embodiments, such as Figure 2 As shown, the plane where the explosion-proof valve 210 is located is the characteristic plane, and the distance between the rib 111 and the characteristic plane is the first distance d1. The distance between the non-rib 111 part of the reinforced box wall 110 and the characteristic plane is the second distance d2, and the difference between the first distance d1 and the second distance d2 ranges from 2mm to 20mm.

[0040] In this embodiment, the distance between the rib 111 and the feature plane specifically refers to the maximum distance between the rib 111 and the feature plane, that is, the distance between the surface of the rib 111 facing away from the battery pack 200 and the feature plane. Neither the first distance d1 nor the second distance d2 should be too large. If the first distance d1 is too large, that is, the rib 111 protrudes a great height from the reinforcing wall 110, which increases the overall height of the battery pack 100, thereby increasing the space required by the battery pack 100, which is detrimental to the miniaturization and energy density of the battery pack. The first distance d1 should also not be too small, as this would result in the rib 111 being too small, thus the rib 111's effect on improving the structural strength of the reinforcing wall 110 would be poor, and the risk of the reinforcing wall 110 being breached by high-temperature flue gas would still be relatively high. The second distance d2 should also not be too large. If the second distance d2 is too large, the distance between the battery pack 200 and the reinforcing wall 110 is large, resulting in a lower energy density of the battery pack. The second distance d2 should not be too small. If the second distance d2 is too small, it means that the distance between the battery pack 200 and the reinforcing casing 110 is too small, which will affect the busbar configuration in the battery pack. By controlling the range of the difference between the first distance d1 and the second distance d2, the battery pack can have a large energy density to meet the requirements of battery pack miniaturization, while also improving the structural strength of the reinforcing casing 110, without affecting the space requirements of the busbars in the battery pack.

[0041] For example, the difference between the first distance d1 and the second distance d2 can be any value within the range of 2mm-20mm or any two values. This embodiment does not specify a particular value. For example, the difference between the first distance d1 and the second distance d2 can be 2mm, 5mm, 10mm, 15mm, 18mm, or 20mm.

[0042] It should be noted that the explosion-proof valve 210 is typically plate-shaped. Therefore, the plane containing the explosion-proof valve 210 can be understood as the end face of the battery pack 200 facing the reinforcing casing wall 110. Of course, it can also be understood that the plane containing the explosion-proof valve 210 can be understood as the surface of the explosion-proof valve 210 facing the reinforcing casing wall 110 or the top surface of the explosion-proof valve 210; the specific choice can be made flexibly according to requirements, and this embodiment does not limit this.

[0043] It should also be noted that the non-ribbed part of the reinforcing box wall 110 is specifically the area of ​​the reinforcing box wall 110 that does not have ribbed 111. For example, the area of ​​the reinforcing box 120 without ribbed 111 is usually flat.

[0044] In some optional embodiments, the first distance d1 is in the range of 5mm-30mm. The first distance d1 can be any value within the range of 5mm-30mm or any range between two values. For example, the first distance d1 is 5mm, 10mm, 15mm, 20mm, 25mm, or 30mm.

[0045] Optionally, the second distance d2 can be in the range of 3mm-25mm. The second distance d2 can be any value within the range of 3mm-25mm or any range between two values. For example, the second distance d2 can be 3mm, 5mm, 8mm, 10mm, 18mm, 20mm, or 25mm.

[0046] In some alternative embodiments, such as Figure 2 As shown, the width direction of the rib 111 is the same as the width direction of the explosion-proof valve 210, and the width of the rib 111 is L1, while the width of the explosion-proof valve 210 is L2. The value range of L1 / L2 is 1.5-4; that is, the ratio of L1 to L2 is 1.5-4. By limiting the ratio of the width of the rib 111 to the width of the explosion-proof valve 210, the rib 111 has sufficient space for the flow of high-temperature gas and particulate matter after the explosion-proof valve 210 ruptures, thereby reducing the risk of high-temperature gas and particulate matter stagnation.

[0047] For example, the value of L1 / L2 can be any value in the range of 1.5-4 or any two values ​​in between; this embodiment does not limit this. For example, the values ​​of L1 / L2 are 1.5, 1.8, 2, 2.5, 3, 3.5, and 4.

[0048] Optionally, the width L1 of the rib 111 can range from 10mm to 400mm. The width L1 of the rib 111 cannot be too large, as this would result in a small area of ​​the reinforced casing wall 110 without the rib 111, reducing the binding effect on the battery pack 200. This would cause the battery pack 200 to easily bounce within the battery box 100, resulting in poor stability, and the structural reinforcement effect on the reinforced casing wall 110 would be insignificant. Conversely, the width L1 of the rib 111 cannot be too small, as this would increase the manufacturing difficulty of the rib 111 and make it difficult to ensure that the explosion-proof valve 210 is aligned with the rib 111, thus still posing a risk that the reinforced casing wall 110 could be breached by high-temperature gases.

[0049] It should be noted that the width L of the protruding rib 111 can be any value within the range of 10mm-400mm or between any two values, and this embodiment does not limit it. For example, the width L1 of the protruding rib 111 can be 10mm, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, or 400mm.

[0050] Alternatively, the width L2 of the explosion-proof valve 210 can range from 20mm to 100mm. In this embodiment, the width L2 of the explosion-proof valve 210 can be any value within the range of 20mm to 100mm or any two values; this embodiment does not limit this. For example, the width L2 of the explosion-proof valve 210 can be 20mm, 30mm, 40mm, 50mm, 60mm, 80mm, or 100mm.

[0051] It should be noted that the battery pack 200 typically includes multiple batteries, each of which has an explosion-proof valve 210. That is, in this embodiment, there are multiple explosion-proof valves 210. The orthographic projection of each explosion-proof valve 210 onto the reinforced housing wall 110 at least partially overlaps with the rib 111, ensuring that if any explosion-proof valve 210 ruptures, the high-temperature gas and particles ejected from that valve 210 will all be directed towards the rib 111, thereby preventing the high-temperature gas and particles ejected from each explosion-proof valve 210 from breaking through the reinforced housing wall 110.

[0052] In this embodiment, multiple ribs 111 are provided to correspond to the case of multiple explosion-proof valves 210. The sum of the projected areas of the multiple ribs 111 in the first direction should not be too large as a proportion of the projected area of ​​the reinforcing box wall 110 in the first direction. If it is too large, the area of ​​the reinforcing box wall 110 without ribs 111 will be too small, which will reduce the restraining effect on the battery pack 200 and cause the battery pack 200 to easily jump within the battery box 100, resulting in poor stability. The sum of the projected areas of the multiple ribs 111 in the first direction should not be too small as a proportion of the projected area of ​​the reinforcing box wall 110 in the first direction. If it is too small, the ribs 111 will be too narrow. On the one hand, the space for the ribs 111 to accommodate high-temperature gas is small, which makes the high-temperature gas have a greater impact on adjacent batteries. In severe cases, it may cause thermal runaway of adjacent batteries or accidental opening of the explosion-proof valve 210. On the other hand, the structural reinforcement effect on the reinforcing box wall 110 is not obvious. Here, the first direction is the thickness direction of the reinforcing box wall 110.

[0053] To extend the travel distance of the high-temperature gas within the rib 111, in some optional embodiments, the length of the rib 111 in its extending direction cannot be too small. If the rib 111 is too short, the high-temperature gas will not be able to diffuse. Therefore, a suitable rib 111 length allows the high-temperature gas to travel a longer distance within the rib 111, ensuring that the temperature of the diffused gas does not become excessively high and reducing its impact on other normal batteries. In some optional embodiments, the rib 111 can extend to the edge of the reinforcing wall 110 to guide the high-temperature gas to the edge of the reinforcing wall 110, facilitating heat dissipation.

[0054] To ensure that more of the high-temperature gas ejected by the explosion-proof valve 210 reaches the rib 111, in one embodiment, the width of the overlapping area between the orthographic projection of the explosion-proof valve 210 on the reinforced housing wall 110 and the rib 111 can be relatively large. This results in a larger area where the explosion-proof valve 210 and the rib 111 face each other, ensuring that more high-temperature gas reaches the rib 111 without causing damage to areas of the reinforced housing wall 110 without the rib 111, thus further improving the safety and structural strength of the battery pack.

[0055] It should be noted that the overlapping area of ​​the orthographic projection of the explosion-proof valve 210 on the reinforced box wall 110 and the protruding rib 111 can also be understood as the area where the orthographic projection of the explosion-proof valve 210 on the reinforced box wall 110 falls within the protruding rib 111. The width of the overlapping area of ​​the orthographic projection of the explosion-proof valve 210 on the reinforced box wall 110 and the protruding rib 111 can be understood as the size of the overlapping area in the width direction of the protruding rib 111. Specifically, the width direction of the protruding rib 111 is perpendicular to the thickness direction of the reinforced box wall 110 and the length direction (or extension direction) of the protruding rib 111, and the width of the protruding rib 111 is less than the length of the protruding rib 111.

[0056] To further improve the structural strength of the battery pack, in one embodiment, the orthographic projection of the explosion-proof valve 210 on the reinforcing tank wall 110 is completely located within the rib 111. When multiple explosion-proof valves 210 are provided, the orthographic projections of all explosion-proof valves 210 on the reinforcing tank wall 110 are completely located within the rib 111. In this way, the high-temperature and high-pressure gas and high-temperature particulate matter ejected from the explosion-proof valve 210 can completely rush towards the rib 111 and be buffered by the rib 111, reducing the destructive force of the high-temperature and high-pressure gas and high-temperature particulate matter on the reinforcing tank wall 110, thereby further reducing the risk of damage to the reinforcing tank wall 110 and improving the structural strength and safety of the battery pack. It should be noted that the outer contour of the orthographic projection of the explosion-proof valve 210 on the reinforcing tank wall 110 coinciding with the edge of the rib 111 is also considered as the orthographic projection of the explosion-proof valve 210 on the reinforcing tank wall 110 being completely located within the rib 111.

[0057] Furthermore, in the width direction of the rib 111, the explosion-proof valve 210 is centered with the rib 111, that is, in the width direction of the rib 111, the center of the explosion-proof valve 210 is collinear with the center of the rib 111. Since the weakest area of ​​the explosion-proof valve 210 is usually located near the center of the explosion-proof valve 210, high-temperature and high-pressure gas is usually ejected from the center of the explosion-proof valve 210. Therefore, aligning the explosion-proof valve 210 with the rib 111 can further ensure that the ejected gas directly hits the central area of ​​the rib 111, reducing the impact on the areas of the reinforced enclosure wall 110 where the rib 111 is not provided.

[0058] In one embodiment, such as Figure 3 As shown, the length direction of the explosion-proof valve 210 is consistent with the length direction of the rib 111. In other embodiments, such as Figure 4 As shown, the length direction of the explosion-proof valve 210 is consistent with the width direction of the rib 111. Of course, it can be understood that the length direction of the explosion-proof valve 210 can also be set at an angle to both the length and width directions of the rib 111, but this embodiment does not limit this.

[0059] To improve the utilization rate of each rib 111, in this embodiment, as follows: Figure 3 or Figure 4 As shown, at least a portion of the orthographic projection of at least two explosion-proof valves 210 onto the reinforced wall 110 overlaps with the same rib 111, meaning that at least two explosion-proof valves 210 are directly facing the same rib 111. This ensures that the high-temperature gas ejected from each explosion-proof valve 210 can reach the rib 111, and also allows the rib 111 to be relatively long, facilitating the diffusion and cooling of the high-temperature gas.

[0060] In some alternative embodiments, please continue to refer to Figure 3 and Figure 4 Multiple explosion-proof valves 210 are arranged in an array, that is, multiple explosion-proof valves 210 are arranged in rows and columns. Each row and each column includes multiple explosion-proof valves 210. To improve the uniformity of reinforcement of the reinforced box wall 110 structure, multiple ribs 111 are provided, and the multiple ribs 111 are arranged at intervals. In one embodiment, the multiple ribs 111 can be arranged at intervals along the length direction of the reinforced box wall 110 (i.e., transversely). In other embodiments, the multiple ribs 111 are arranged at intervals along the width direction of the reinforced box wall 110 (i.e., longitudinally). In another embodiment, several of the protruding ribs 111 are spaced apart along the length of the reinforcing box wall 110, and the remaining protruding ribs 111 are spaced apart along the width of the reinforcing box wall 110. The transversely placed protruding ribs 111 intersect with the longitudinally placed protruding ribs 111. That is, the plurality of protruding ribs 111 includes a first protruding rib extending along the width of the reinforcing box wall 110 and a second protruding rib extending along the length of the reinforcing box wall 110, with the first and second protruding ribs intersecting. The specific arrangement of the protruding ribs 111 can be selected according to parameters such as the shape and size of the reinforcing box wall 110; this embodiment does not limit this arrangement.

[0061] In one embodiment, the orthographic projections of the explosion-proof valves 210 located in the same row onto the reinforced housing wall 110 all at least partially overlap with the same rib 111. In other embodiments, such as Figure 3 or Figure 4 As shown, the orthographic projections of the explosion-proof valves 210 located in the same column onto the reinforced box wall 110 all overlap at least partially with the same rib 111.

[0062] In another embodiment, such as Figure 5 As shown, the orthographic projections of the explosion-proof valves 210 located in the same row on the reinforced box wall 110 all overlap at least partially with the same rib 111, and the orthographic projections of the explosion-proof valves 210 located in the same column on the reinforced box wall 110 all overlap at least partially with the same rib 111. That is, there are two intersecting ribs 111. The gas ejected from an explosion-proof valve 210 can flow along both the horizontal and vertical ribs 111, which further improves the diffusion efficiency and cooling rate of high-temperature gas, and further reduces the impact of high-temperature gas on adjacent batteries.

[0063] Optionally, such as Figure 1 or Figure 6 As shown, the end of the battery pack 200 facing the reinforcing casing wall 110 also has a terminal post 220, wherein the orthographic projection of the terminal post 220 on the reinforcing casing wall 110 is located outside the rib 111. This reduces the impact of high-temperature gas or particles ejected by the explosion-proof valve 210 on the terminal post 220, and the width of the rib 111 does not need to be excessively large to accommodate the terminal post 220. Furthermore, the reinforcing casing wall 110 can also limit the entire battery pack 200 through the terminal post 220, reducing the risk of the battery pack 200 jumping. It should be noted that the battery pack 200 in this embodiment includes multiple batteries, each battery including two terminal posts 220 and one explosion-proof valve 210, with the explosion-proof valve 210 located between the two terminal posts 220.

[0064] In one embodiment, such as Figure 6 As shown, the battery box 100 includes a box body 120 with an opening and a cover connected to the opening end of the box body 120. The box body 120 and the cover cooperate to form a receiving space. The cover is a reinforcing wall 110; that is, in this embodiment, the protruding rib 111 is provided on the cover. By providing the box body 120 and the cover, the manufacturing of the battery box 100 can be facilitated. In some optional embodiments, the cover can be made of stainless steel to provide higher structural strength.

[0065] In other embodiments, the battery box 100 is a one-piece structure.

[0066] The battery pack provided in this embodiment has high structural strength, and the probability of the battery box 100 being ruptured by high temperature and high pressure gas is low, which makes the battery pack safe and reliable, and will not affect the normal use of other battery packs.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery pack, characterized by, The battery box (100) has a reinforced box wall (110) with a convex rib (111); The battery pack (200) is arranged in the battery box (100), and one end of the battery pack (200) towards the reinforced box wall (110) is provided with an explosion-proof valve (210), and the orthogonal projection of the explosion-proof valve (210) on the reinforced box wall (110) at least partially overlaps the convex rib (111); the convex rib (111) protrudes away from the battery pack (200). The plane where the explosion-proof valve (210) is located is a characteristic plane, the distance between the convex rib (111) and the characteristic plane is a first distance, the distance between the non-convex rib (111) part of the reinforced box wall (110) and the characteristic plane is a second distance, and the difference between the first distance and the second distance ranges from 2mm to 20mm.

2. The battery pack of claim 1, wherein, The first distance ranges from 5mm to 30mm, and the second distance ranges from 3mm to 25mm.

3. The battery pack of claim 2, wherein, The width direction of the convex rib (111) is the same as the width direction of the explosion-proof valve (210), and the width of the convex rib (111) is L1, the width of the explosion-proof valve (210) is L2, and the value range of L1 / L2 is 1.5-4; 4. The battery pack of claim 1, wherein, The width L1 of the convex rib (111) ranges from 10mm to 400mm, and the width L2 of the explosion-proof valve (210) ranges from 20mm to 100mm. The orthogonal projection of the explosion-proof valve (210) on the reinforced box wall (110) is completely located in the convex rib (111).

5. The battery pack of claim 1, wherein, The explosion-proof valve (210) is provided with a plurality of explosion-proof valves (210), and the orthogonal projection of each explosion-proof valve (210) on the reinforced box wall (110) at least partially overlaps the convex rib (111).

6. The battery pack of any one of claims 1-5, wherein, At least two orthogonal projections of the explosion-proof valve (210) on the reinforced box wall (110) at least partially overlap the same convex rib (111).

7. The battery pack of claim 6, wherein, A plurality of explosion-proof valves (210) are arranged in an array, and a plurality of convex ribs (111) are provided; 8. The battery pack of claim 7, wherein, The orthogonal projection of the explosion-proof valve (210) on the reinforced box wall (110) is completely located in the convex rib (111). The battery pack (200) is provided with a plurality of explosion-proof valves (210) towards the reinforced box wall (110), and the orthogonal projection of each explosion-proof valve (210) on the reinforced box wall (110) at least partially overlaps the convex rib (111).

9. The battery pack of any one of claims 1-5, wherein, The convex rib (111) extends along the width direction of the reinforced box wall (110); 10. The battery pack of any one of claims 1-5, wherein, Or, the convex rib (111) extends along the length direction of the reinforced box wall (110). ​ Alternatively, the convex ribs (111) are provided in plurality, and the plurality of convex ribs (111) include first convex ribs extending in a width direction of the reinforcing box wall (110) and second convex ribs extending in a length direction of the reinforcing box wall (110), and the first convex ribs intersect with the second convex ribs.

11. The battery pack of any one of claims 1-5, wherein, The battery box (100) includes a box body (120) having an opening and a box cover connected with an opening end of the box body (120), and the box body (120) and the box cover cooperatively form a containing space, and the box cover is the reinforcing box wall (110).

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