Battery box and energy storage device

Abstract

The utility model relates to a battery box and an energy storage device. The battery box body comprises an end plate and a side plate. The end plates comprise a first end plate and a second end plate, the first end plate and the second end plate are oppositely arranged in the length direction of the battery box body, and the first end plate is provided with a cooling device; the side plate is connected between the first end plate and the second end plate, a plurality of through vent holes are formed in the side plate, the vent holes form a plurality of groups at intervals in the length direction of the battery box body, the area of one group of vent holes is N times of the area of the other group of vent holes which are adjacent to the group of vent holes and close to the first end plate, and N is greater than 1. According to the structure of the battery box body, on the basis of increasing the air introduction amount, the air fluidity can be improved, so that the heat dissipation effect is improved, the temperature difference in the battery box body is reduced, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery heat dissipation, and in particular to a battery box and an energy storage device. Background Art

[0002] The battery box is used to accommodate the battery module, which will generate heat during operation. This is because when the battery in the battery module is charged and discharged, part of the energy inside it will be converted into heat energy instead of electrical energy. In addition, the chemical reaction inside the battery will also generate heat. If the heat cannot be effectively dissipated, the battery temperature will be too high, which will cause the battery chemical reaction rate to be too fast, resulting in a decrease in battery performance, a decrease in the capacity of the battery cell, and a decrease in the charging and discharging efficiency. In addition, the continuous high temperature state will accelerate the aging of the battery, cause structural damage to the battery, and reduce the cycle life of the battery. Furthermore, overheating of the battery will increase the risk of thermal runaway, especially when the battery is physically damaged, overcharged, over-discharged or internally short-circuited, which may trigger a chain reaction that causes the battery to overheat, catch fire or even explode. Therefore, if the battery box does not effectively dissipate heat in time to reduce the temperature of the battery, it will affect the performance, life and safety of the battery. Utility Model Content

[0003] Based on this, it is necessary to provide a battery box and energy storage device to address the problem that if the battery box is not effectively cooled in time to reduce the temperature of the battery, the performance, life and safety of the battery will be affected.

[0004] In a first aspect, a battery box comprises:

[0005] an end plate, comprising a first end plate and a second end plate, wherein the first end plate and the second end plate are arranged opposite to each other along the length direction of the battery box, and the first end plate is provided with a cooling device; and

[0006] A side plate is connected between the first end plate and the second end plate, and the side plate is penetrated by a plurality of ventilation holes. The ventilation holes form a plurality of spaced groups along the length direction of the battery box, and the area of ​​one group of the ventilation holes is N times the area of ​​another group of the ventilation holes adjacent thereto and close to one side of the first end plate, wherein N satisfies that N is greater than 1.

[0007] In one embodiment, the distance each of the ventilation holes extends along the thickness direction of the battery case is greater than the distance each of the ventilation holes extends along the length direction of the battery case.

[0008] In one of the embodiments, the ventilation holes are symmetrically arranged along the width direction of the battery box.

[0009] In one of the embodiments, a first vent is formed through the first end plate, and the cooling device is disposed at the first vent.

[0010] In one embodiment, a second ventilation opening is formed through the second end plate.

[0011] In a second aspect, an energy storage device includes a battery module and a battery case, wherein the battery case is the battery case as described in the first aspect, wherein the battery case has a receiving cavity and a ventilation hole connected to the receiving cavity, and the receiving cavity is used to accommodate the battery module.

[0012] In one embodiment, the ventilation hole is located between two ends of the battery module.

[0013] In one embodiment, along the length direction of the battery case, the battery module includes a first end and a second end opposite to each other, the battery module includes a plurality of battery cells, the ventilation holes form a first group, a second group and a third group of spaced apart battery cells, the ventilation holes in the first group are arranged near the battery cells at the first end, the ventilation holes in the second group are arranged near the battery cells in the middle between the first end and the second end, and the ventilation holes in the third group are arranged near the battery cells at the second end.

[0014] In one embodiment, the ventilation holes in the first group, the second group, and the third group correspond to a plurality of battery cells.

[0015] In one embodiment, the area of ​​the ventilation holes in the first group is S1, the area of ​​the ventilation holes in the second group is S2, and the area of ​​the ventilation holes in the third group is S3, satisfying S1:S2:S3=(5~6):(3~4):(1~2).

[0016] The battery case is provided with a cooling device on the first end plate, so as to suck the air outside the battery case into the battery case through the ventilation holes, and finally discharge the air outside the battery case. In addition, a plurality of ventilation holes are provided on the side plate, so that the ventilation holes form a plurality of groups spaced apart along the length direction of the battery case, and the area of ​​a group of ventilation holes is larger than the area of ​​another group of ventilation holes adjacent to it and close to the first end plate. In other words, when the areas of the two adjacent groups of ventilation holes on the side plate are compared, the area of ​​the group of ventilation holes close to the first end plate is always smaller than the area of ​​the group of ventilation holes far from the first end plate. As a result, the areas of the several groups of ventilation holes close to the cooling device are small, which can increase the pressure of the air and increase the flow speed of the air; and on the side far from the cooling device, the areas of the several groups of ventilation holes are large, which can reduce the resistance of the air flow and make more air flow into the battery case. Therefore, by setting the ventilation holes, the air flow is accelerated to bring out the heat on the basis of increasing the air intake, so that the present application can solve the heat dissipation problem of the battery case and ensure the performance, life and safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery box accommodating a battery module provided in an embodiment of the present application.

[0018] Figure 2 A side view of a battery box provided in an embodiment of the present application.

[0019] Explanation of the accompanying drawings: 1. battery module; 11. first end; 12. second end; 13. battery cell; 131. first battery cell; 132. second battery cell; 133. third battery cell; 134. fourth battery cell; 135. fifth battery cell; 136. sixth battery cell; 137. seventh battery cell; 138. eighth battery cell; 2. battery case; 21. first end plate; 22. second end plate; 23. first side plate; 24. second side plate; 25. cooling device; 26. ventilation hole; 261. first group; 262. second group; 263. third group; 27. first vent; 28. second vent. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0021] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0022] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0024] The battery box is used to accommodate battery modules. During operation, the battery modules will generate a lot of heat and accumulate in the battery box. If the heat is not discharged in time, it will affect the performance and service life of the battery modules, and even cause the risk of thermal runaway or fire.

[0025] Based on the above questions, please refer to Figure 1 and Figure 2 , Figure 1 The A direction is the length direction of the battery case 2, the B direction is the height direction of the battery case 2, and the C direction is the width direction of the battery case 2. The embodiment of the present application provides a battery case 2, including an end plate and a side plate. The end plate includes a first end plate 21 and a second end plate 22, which are arranged relatively along the length direction of the battery case 2, and the cooling device 25 is arranged on the first end plate 21; the side plate is connected between the first end plate 21 and the second end plate 22, and the side plate is provided with a plurality of ventilation holes 26 passing through. Along the length direction of the battery case 2, the ventilation holes 26 form multiple groups of intervals, and the area of ​​one group of ventilation holes 26 is N times the area of ​​another group of ventilation holes 26 adjacent to it and close to the first end plate 21, wherein N is greater than 1. Multiple groups of ventilation holes 26 are arranged on the side plate, and the areas of the multiple groups of ventilation holes 26 decrease in groups along the direction from the second end plate 22 to the first end plate 21. In other words, among any two adjacent groups of ventilation holes 26 , the area of ​​the group of ventilation holes 26 close to the second end plate 22 is larger than the area of ​​the group of ventilation holes 26 close to the first end plate 21 .

[0026] See also Figure 1 and Figure 2 The cooling device 25 is used to draw external air into the battery box 2 through the ventilation holes 26 to remove the heat inside the battery box 2. The cooling device 25 is arranged on the first end plate 21. In the direction close to the cooling device 25, the area of ​​the plurality of ventilation holes 26 gradually decreases, which can increase the pressure and flow rate of the air. The area of ​​the plurality of ventilation holes 26 away from the cooling device 25 gradually increases, which can reduce the air flow resistance and increase the amount of air introduced, so that more air is drawn into the battery box 2 and is taken out by the cooling device 25 at a faster speed, thereby improving the heat dissipation effect of the battery box 2.

[0027] The embodiment of the present application does not limit the number of groups of ventilation holes 26 . For example, there may be two groups of ventilation holes 26 , three groups of ventilation holes 26 , or four groups of ventilation holes 26 .

[0028] The embodiment of the present application does not limit the spacing between each group of ventilation holes 26. For example, the spacing between two adjacent groups of ventilation holes 26 may be the same or different.

[0029] The embodiment of the present application does not limit the number of ventilation holes 26 in each group. For example, the number of ventilation holes 26 included in each group may be one, two, three, four, five or more.

[0030] The embodiment of the present application does not limit the distance between two adjacent ventilation holes 26 in each group of ventilation holes 26. For example, the distance between two adjacent ventilation holes 26 may be the same or different.

[0031] See also Figure 2 , the embodiment of the present application does not limit the shape of the ventilation hole 26, for example, it can be strip-shaped, circular or polygonal. In some embodiments, the distance that each ventilation hole 26 extends along the thickness direction of the battery case 2 is greater than the distance it extends along the length direction of the battery case 2. In other words, each ventilation hole 26 is in the shape of an elongated strip and is vertically arranged along the thickness direction of the battery case 2. The vertically arranged ventilation holes 26 are conducive to the air entering the top and bottom of the battery case 2, and can better guide the flow of air, so that the air can flow more effectively and improve the heat dissipation effect. In addition, compared with the horizontally arranged ventilation holes 26, the vertically arranged ventilation holes 26 can reduce the length of the battery case 2, reduce the flow path length of the battery case 2, improve the heat dissipation efficiency, and are conducive to compacting the structural dimensions of the battery case 2.

[0032] See also Figure 1 The side panels include a first side panel 23 and a second side panel 24 which are arranged opposite to each other along the width direction of the battery box 2, and the first side panel 23 and the second side panel 24 are connected between the first end panel 21 and the second end panel 22. The plurality of through holes may be arranged only on the first side panel 23, or only on the second side panel 24, or on the first side panel 23 and the second side panel 24 at the same time. In order to provide uniform heat dissipation of the battery box 2 by the ventilation holes 26, a plurality of ventilation holes 26 are arranged on the first side panel 23 and the second side panel 24 at the same time. It should be noted that when a plurality of ventilation holes 26 are arranged on the first side panel 23 and the second side panel 24 at the same time, the plurality of ventilation holes 26 on each side panel are reduced group by group in the direction close to the first end panel 21.

[0033] See also Figure 1, the embodiment of the present application does not limit the arrangement of the ventilation holes 26 on the battery case 2. Exemplarily, along the width direction of the battery case 2, the ventilation holes 26 may be symmetrically arranged or asymmetrically arranged. It is understandable that when the ventilation holes 26 are symmetrically arranged, the multiple groups of ventilation holes 26 on the first side plate 23 and the second side plate 24 are symmetrically arranged. In other words, the number of groups of ventilation holes 26 on the first side plate 23 and the second side plate 24 is the same, the spacing between two adjacent groups of ventilation holes 26 is the same, the number of ventilation holes 26 in each group is the same, the spacing between two adjacent ventilation holes 26 is consistent, and the shape and size of the ventilation holes 26 on the first side plate 23 and the second side plate 24 are the same. When the ventilation holes 26 are asymmetrically arranged, the multiple groups of ventilation holes 26 on the first side plate 23 and the second side plate 24 are staggered. In other words, when at least one of the number of groups of ventilation holes 26 on the first side plate 23 and the second side plate 24, the spacing between two adjacent groups of ventilation holes 26, the number of ventilation holes 26 in each group, the spacing between two adjacent ventilation holes 26, and the shape or size of the ventilation holes 26 on the first side plate 23 and the second side plate 24 are different, the ventilation holes 26 on the first side plate 23 and the second side plate 24 are asymmetrically arranged.

[0034] See also Figure 1 Preferably, in some embodiments, the ventilation holes 26 are symmetrically arranged along the width direction of the battery box 2. This ensures that the air flows evenly inside the battery box 2, thereby achieving even heat dissipation. This helps to avoid excessive local temperature and improve the overall heat dissipation effect. The symmetrically arranged ventilation holes 26 can reduce the dead corners inside the battery box 2 and avoid some areas from not being able to obtain good air circulation, thereby ensuring that the temperature inside the entire box is evenly distributed.

[0035] See also Figure 1 In some embodiments, the first end plate 21 is provided with a first vent 27, and the cooling device 25 is provided at the first vent 27. The cooling device 25 is used to bring the gas inside the battery box 2 out of the first vent 27 to remove the heat inside the battery box 2. Optionally, the cooling device 25 can be a fan or an air pump, both of which can discharge the air inside the battery box 2 out of the battery box 2.

[0036] See also Figure 1 Furthermore, the cooling device 25 is disposed on a side of the first end plate 21 facing the interior of the battery box 2 , which is beneficial for directly dissipating the heat in the battery box 2 .

[0037] See also Figure 1The first vents 27 can be symmetrically arranged along the width direction of the battery box 2. For example, one first vent 27 is arranged near the first side plate 23, and another first vent 27 is arranged near the second side plate 24. A cooling device 25 is installed on each of the two first vents 27 to exhaust gas. The symmetrical arrangement of the first vents 27 can improve the uniformity of heat dissipation in the battery box 2 and avoid excessive temperature differences between various parts of the battery box 2.

[0038] See also Figure 1 In some embodiments, the second end plate 22 is provided with a second vent 28. The second vent 28 is used for air intake. The second vent 28 can be symmetrically arranged along the width direction of the battery box 2. For example, one second vent 28 is arranged near the first side plate 23, and another second vent 28 is arranged near the second side plate 24. The symmetrical arrangement of the second vent 28 can make air enter the battery box 2 more uniformly, further improve the uniformity of air flow, and thus improve the heat dissipation effect.

[0039] Exemplarily, the second ventilation openings 28 may be multiple and spaced apart and densely distributed to form a hollow mesh structure, which can increase the air entry area while ensuring the structural strength of the second end plate 22, thereby improving the heat dissipation effect.

[0040] On the second aspect, the embodiments of the present application also provide an energy storage device that can be used in the fields of household energy storage, backup power storage, industrial and commercial energy storage, portable energy storage, etc. The household energy storage device can realize grid frequency and peak regulation, demand-side response, and form a microgrid. The backup power storage device can be applied to communication base stations, data rooms, public security monitoring, rail transit, etc., including indoor energy storage battery cabinets, integrated storage and charging machines, and large-scale energy storage systems. The industrial and commercial energy storage device is suitable for car charging stations, emergency backup power in areas without electricity or power shortage, grid-connected applications, etc., and can be used in small power stations, resort islands, ports, hotels, schools or hospitals and other places. The portable energy storage device can realize the integrated application of photovoltaics, energy storage and batteries, and can be used as an ideal portable power source for many activities at home, outdoors and in emergency situations.

[0041] The number of energy storage devices can be one or more. When the number of energy storage devices is multiple, multiple energy storage devices can be connected in series, in parallel, or in a combination of series and parallel to achieve greater capacity and power. Energy storage devices may include but are not limited to battery packs, battery clusters, energy storage cabinets, energy storage containers, etc.

[0042] See also Figure 1The energy storage device includes a battery box 2 and a battery module 1. The battery box 2 is the battery box 2 described in the first aspect, and the battery box 2 has a receiving cavity and a ventilation hole 26 connected to the receiving cavity, and the receiving cavity is used to receive the battery module 1. The battery module 1 includes a plurality of battery cells 13 and a battery management system, and a plurality of battery cells 13 are electrically connected through a connecting piece, and the battery cells 13 at one end of the battery module 1 are electrically connected to the battery management system through the connecting piece.

[0043] The battery cell 13 may be a secondary battery such as a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, a lithium-ion battery, a polymer lithium-ion battery, or a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The battery cell 13 may be a square battery.

[0044] See also Figure 1 In some embodiments, along the width direction of the battery case 2, the ventilation hole 26 is located between the two ends of the battery module 1. Therefore, the opening area of ​​the ventilation hole 26 is arranged directly opposite to the battery module 1, so that the air entering through the ventilation hole 26 can directly take away the heat from the battery cells 13 in the battery module 1, which is conducive to heat dissipation.

[0045] The battery module 1 provided in the embodiment of the present application may also include two, three, four or five. The multiple battery modules 1 are all arranged in the receiving cavity of the battery box 2. Figure 1 , taking two battery modules 1 as an example, along the width direction of the battery box 2, the two battery modules 1 are symmetrically arranged. One battery module 1 is arranged close to the first side plate 23, and the other battery module 1 is arranged close to the second side plate 24. The two battery modules 1 are arranged at intervals, and there is a spacing between the two battery modules 1 and the first side plate 23 and the second side plate 24 to form multiple flow channels for air flow. When the first side plate 23 and the second side plate 24 are symmetrically provided with multiple groups of ventilation holes 26, the multiple groups of ventilation holes 26 on each side plate correspond to one battery module 1, which can take away the heat from the battery cell 13 close to it, thereby avoiding the temperature difference in the battery box 2 and improving the uniformity of heat dissipation.

[0046] See also Figure 1 In some embodiments, along the length direction of the battery case 2, the battery module 1 includes a first end 11 and a second end 12 opposite to each other, the battery module 1 includes a plurality of battery cells 13, and the ventilation holes 26 form a first group 261, a second group 262, and a third group 263 spaced apart. The ventilation holes 26 of the first group 261 are arranged close to the battery cells 13 at the first end 11, the ventilation holes 26 of the second group 262 are arranged close to the battery cells 13 at the middle position of the first end 11 and the second end 12, and the ventilation holes 26 of the third group 263 are arranged close to the battery cells 13 at the second end 12. With this arrangement, the temperature difference between the battery cells 13 can be reduced.

[0047] Specifically, since the opening area formed by the ventilation holes 26 of the first group 261 is the largest, the battery cell 13 is arranged near the first end 11, which can increase the amount of air entering the battery module 1 near the first end 11, so that more air moves in the direction of the first end plate 21, and thus can bring out more heat. The opening area formed by the ventilation holes 26 of the second group 262 is located between the first group 261 and the third group 263, and its position is located between the first end 11 and the second end 12. On the one hand, it can ensure the amount of air entering, and on the other hand, it can ensure the air flow rate, and promote the air carrying heat to move to the first ventilation port 27. The opening area formed by the ventilation holes 26 of the third group 263 is the smallest, which increases the air flow rate, so that the air inside the battery box 2 is quickly discharged from the first ventilation port 27.

[0048] See also Figure 1 In some embodiments, the ventilation holes 26 of the first group 261, the second group 262, and the third group 263 all correspond to multiple battery cells 13. Thus, each group of ventilation holes 26 can dissipate heat for multiple battery cells 13 at the same time, thereby increasing the heat dissipation area and heat dissipation efficiency.

[0049] For example, the battery module 1 includes eight battery cells 13 along its length direction, and the battery cell 13 at the first end 11 of the battery module 1 is the first battery cell 131, and the battery cell 13 at the second end 12 is the eighth battery cell 138. The ventilation area of ​​the ventilation holes 26 of the first group 261 at least covers part of the first battery cell 131 and the second battery cell 132, the ventilation area of ​​the ventilation holes 26 of the second group 262 at least covers part of the fourth battery cell 134 and the fifth battery cell 135, and the ventilation area of ​​the ventilation holes 26 of the third group 263 at least covers part of the seventh battery cell 137 and the eighth battery cell 138.

[0050] It should be noted that the battery module 1 provided in the embodiment of the present application may also include four, five, six, seven, nine or other number of battery cells 13 along its length direction.

[0051] In some embodiments, the area of ​​the first group 261 ventilation holes 26 is S1, the area of ​​the second group 262 ventilation holes 26 is S2, and the area of ​​the third group 263 ventilation holes 26 is S3, satisfying S1: S2: S3 = (5-6): (3-4): (1-2). According to finite element simulation calculation tests, the three groups of ventilation holes 26 within this range can effectively improve the overall heat dissipation uniformity of the battery box 2, reduce the temperature difference, and improve the heat dissipation efficiency.

[0052] For example, S1:S2:S3 may be 5:3:1, or 5:3:2, or 6:3:2, etc. Figure 1Taking S1:S2:S3=5:3:2 as an example, when the shapes and sizes of the ventilation holes 26 are consistent, this ratio can also be regarded as the ratio of the number of ventilation holes 26. In other words, the number of ventilation holes 26 in the first group 261: the number of ventilation holes 26 in the second group 262: the number of ventilation holes 26 in the third group 263 = 5:3:2.

[0053] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery box, characterized in that: include: an end plate, comprising a first end plate and a second end plate, wherein the first end plate and the second end plate are arranged opposite to each other along the length direction of the battery box, and the first end plate is provided with a cooling device; and A side plate is connected between the first end plate and the second end plate, and the side plate is penetrated by a plurality of ventilation holes. The ventilation holes form a plurality of spaced groups along the length direction of the battery box, and the area of ​​one group of the ventilation holes is N times the area of ​​another group of the ventilation holes adjacent thereto and close to one side of the first end plate, wherein N satisfies that N is greater than 1.

2. The battery box according to claim 1, characterized in that: The distance each of the ventilation holes extends along the thickness direction of the battery box is greater than the distance each of the ventilation holes extends along the length direction of the battery box.

3. The battery box according to claim 1, characterized in that: The ventilation holes are symmetrically arranged along the width direction of the battery box.

4. The battery box according to claim 1, characterized in that: The first end plate is penetrated by a first ventilating opening, and the cooling device is arranged at the first ventilating opening.

5. The battery box according to claim 1, characterized in that: The second end plate is provided with a second ventilating opening therethrough.

6. An energy storage device, characterized in that: It comprises a battery module and a battery case, wherein the battery case is the battery case as claimed in any one of claims 1 to 5, and the battery case has a accommodating cavity and a ventilation hole connected to the accommodating cavity, and the accommodating cavity is used to accommodate the battery module.

7. The energy storage device according to claim 6, characterized in that: The ventilation hole is located between two ends of the battery module.

8. The energy storage device according to claim 7, characterized in that: Along the length direction of the battery case, the battery module includes a first end and a second end opposite to each other, the battery module includes a plurality of battery cells, the ventilation holes form a first group, a second group and a third group of intervals, the ventilation holes in the first group are arranged close to the battery cells at the first end, the ventilation holes in the second group are arranged close to the battery cells in the middle between the first end and the second end, and the ventilation holes in the third group are arranged close to the battery cells at the second end.

9. The energy storage device according to claim 8, characterized in that: The ventilation holes in the first group, the second group and the third group all correspond to a plurality of battery cells.

10. The energy storage device according to claim 8, characterized in that: The area of ​​the ventilation holes in the first group is S1, the area of ​​the ventilation holes in the second group is S2, and the area of ​​the ventilation holes in the third group is S3, satisfying S1:S2:S3=(5~6):(3~4):(1~2).

Images