Battery pack and energy storage unit

Abstract

The utility model belongs to the technical field of energy storage equipment, and relates to a battery pack and an energy storage unit.The battery pack comprises battery modules, a first limiting piece, a second limiting piece and a box, and the multiple battery modules are contained in the box; the box body comprises a front end plate, a rear end plate, a top plate, a bottom plate and side plates, the first limiting pieces are arranged on the top plate and form first channels with the top surfaces of the battery modules, second channels A are formed between the side surfaces of the battery modules and the side plates or between the adjacent battery modules, and the second limiting pieces are arranged on the bottom plate and form third channels with the bottom surfaces of the battery modules; an air supply assembly is arranged at the position, corresponding to the first channel, of the front end plate, and a first ventilation opening and a third ventilation opening which correspond to the first channel and the third channel respectively and communicate with the outside are formed in the rear end plate. According to the invention, uniform and effective heat dissipation of the battery module can be realized, and the heat dissipation efficiency of the battery module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and more specifically, to a battery pack and an energy storage unit. Background Art

[0002] A battery pack is a device including a battery module and a casing. The battery module is contained in the casing. Since the battery module generates a certain amount of heat when working, when the battery module is contained in the casing, the heat will be transferred to the sealed air inside, thereby forming high-temperature gas. The high-temperature gas will bring safety hazards to the battery module and may cause an explosion. Therefore, it is necessary to effectively discharge the high-temperature gas generated by the battery module when working to form heat dissipation.

[0003] Existing heat dissipation methods include using holes in the box to dissipate heat naturally or, in order to improve the heat dissipation efficiency, setting a fan or other air supply device in the box on this basis, and then setting a plurality of through holes connected to the outside on the side of the other side of the box, so as to effectively discharge the heat generated by the battery module inside the box when it is working. However, due to the protection requirements of the box, the openings cannot be too large or too many, and the heat generated between the top, side and bottom surfaces of the battery module is quite different. The heat generated on the top surface of the battery module is higher than the heat generated on the side and bottom surfaces. Therefore, when heat is dissipated through the air supply device, it will cause the heat on the top of the battery module to be difficult to be effectively discharged, and the heat will still accumulate in the box, causing certain safety hazards to the battery module. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present application is how to effectively and uniformly dissipate heat from the battery module.

[0005] In order to solve the above technical problems, the present application provides a battery pack, which adopts the following technical solutions:

[0006] A battery pack comprises: a battery module (1), a first limiting member (2), a second limiting member (3) and a box (4), wherein a plurality of the battery modules (1) are accommodated in the box (4);

[0007] The box body (4) comprises a front end plate (41), a rear end plate (42), a top plate (43), a bottom plate (44) and a side plate (45); the first limiting member (2) is arranged on the top plate (43) and abuts against the top surface of the battery module (1); a first channel (5) extending along the length direction of the battery module (1) is formed between the first limiting member (2) and the top surface of the battery module (1); a second channel A (6) is formed between the side surface of the battery module (1) and the side plate (45) or an adjacent battery module (1); the second limiting member (3) is arranged on the bottom plate (44) and abuts against the bottom surface of the battery module (1). A third channel (7) extending along the length direction of the battery module (1) is formed between the second limiting member (3) and the bottom surface of the battery module (1); the first channel (5), the second channel A (6) and the third channel (7) are connected to each other; an air supply component (411) is provided at a position corresponding to the first channel (5) on the front end plate (41); a first vent (421) and a third vent (423) communicating with the outside are provided on the rear end plate (42); the first vent (421) and the third vent (423) are provided corresponding to the first channel (5) and the third channel (7), respectively.

[0008] Furthermore, the first channel (5) comprises a first air supply channel (51), a first connecting channel (52) and a second connecting channel (53) which are connected to each other; the first air supply channel (51) extends along the length direction of the battery module (1), and the width of the first air supply channel (51) gradually decreases in the length direction of the battery module (1); the first connecting channel (52) and the second connecting channel (53) both extend along the width direction of the battery module (1) and are respectively connected to the second channels A (6) located on both sides of the battery module (1); wherein the first connecting channel (52) is arranged close to the adjacent battery module (1), and the second connecting channel (53) is arranged close to the side plate (45); and the width of the first connecting channel (52) is smaller than the width of the second connecting channel (53).

[0009] Furthermore, the third channel (7) comprises a second air supply channel (71), a third connecting channel (72) and a fourth connecting channel (73) which are connected to each other, wherein the second air supply channel (71) extends along the length direction of the battery module (1), and the third connecting channel (72) and the fourth connecting channel (73) both extend along the width direction of the battery module (1) and are respectively connected to the second channels A (6) located on both sides of the battery module (1), wherein the third connecting channel (72) is arranged close to the adjacent battery module (1), and the fourth connecting channel (73) is arranged close to the side plate (45).

[0010] Furthermore, the second channel A (6) is formed by the side of the battery module (1) and the side plate (45) or the interval between adjacent battery modules (1), and the second channel A (6) is respectively connected to the first channel (5) and the third channel (7) on both sides along the height direction of the battery module (1), and a second vent (422) communicating with the outside is also provided at a position corresponding to the second channel A (6) on the rear end plate (42).

[0011] Furthermore, the battery pack further comprises: a third limiting member (8), the third limiting member (8) being arranged on the side plate (45) or clamped between adjacent battery modules (1), the third limiting member (8) being in contact with the side surface of the battery module (1) to form the second channel B (6'), the second channel B (6') being connected to the first channel (5) and the third channel (7) on both sides along the height direction of the battery module (1), and the width of the second channel B (6') gradually decreasing from the side connected to the first channel (5) to the side connected to the third channel (7).

[0012] Furthermore, the first connecting channel (52) and the third connecting channel (72) are connected to the second channel B (6') close to the adjacent battery module (1), and the width of the second channel B (6') close to the adjacent battery module (1) is 1 / 2 of the sum of the widths of the first connecting channel (52) and the third connecting channel (72);

[0013] The second connecting channel (53) and the fourth connecting channel (73) are connected to the second channel B (6') close to the side plate (45), and the width of the second channel B (6') close to the side plate is 1 / 2 of the sum of the widths of the second connecting channel (53) and the fourth connecting channel (73).

[0014] Furthermore, the first connecting channel (52) and the third connecting channel (72) correspond to each other in the vertical direction, the second connecting channel (53) and the fourth connecting channel (73) correspond to each other in the vertical direction, the width of the third connecting channel (72) is smaller than the width of the first connecting channel (52), and the width of the fourth connecting channel (73) is smaller than the width of the second connecting channel (53).

[0015] Furthermore, the first channel (5) and the third channel (7) are located correspondingly in the vertical direction, and the width of the third channel (7) is smaller than the width of the first channel (5).

[0016] Furthermore, the diameter of the first vent (421) is smaller than the diameter of the third vent (423), the width of the first channel (5) is larger than the diameter of the first vent (421), and the width of the third channel (7) is smaller than the diameter of the third vent (423).

[0017] In order to solve the above technical problems, an embodiment of the present application further provides an energy storage unit, which includes a battery pack and a mounting frame as described above, and the battery pack is installed in the mounting frame for centralized power supply.

[0018] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0019] In this embodiment, a battery pack including a battery module (1), a first limiting member (2), a second limiting member (3) and a box (4) is provided. A plurality of battery modules (1) are arranged in the box (4) so ​​that a second channel A (6) is formed between adjacent battery modules (1) and between the battery modules (1) and a side plate (45) of the box (4). The first limiting member (2) is provided on a top plate (43) of the box (4) to form a first channel (5). The second limiting member (3) is provided on a bottom plate (44) of the box (4) to form a third channel (7). The first channel (5), the second limiting member (3) and the side plate (45) of the box (4) are provided. The channel A (6) and the third channel (7) are connected. When the battery module (1) is working, the air supply component (411) installed on the front plate (41) of the box body (4) supplies air to the first channel (5), so that part of the air passes through the first channel, and the other part flows from the first channel (4) through the second channel (5) and then through the third channel (6). Finally, the high-temperature gas inside the box body (4) is respectively sent to the outside through the first ventilation port (421) and the third ventilation port (423) on the rear plate (42), thereby achieving uniform and effective heat dissipation of the top surface, side surface and bottom surface of the battery module (1). BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a battery pack embodiment of the present application;

[0022] Figure 2 This is an exploded structural diagram of a battery pack embodiment of the present application;

[0023] Figure 3A schematic plan view of a first channel of a battery pack embodiment of the present application;

[0024] Figure 4 A schematic plan view of a third channel of a battery pack embodiment of the present application;

[0025] Figure 5 This is an exploded structural diagram of another embodiment of the battery pack of the present application;

[0026] Figure 6 A schematic plan view of a second channel located between adjacent battery modules in another embodiment of the battery pack of the present application;

[0027] Figure 7 This is a schematic plan view of a second channel located between a battery module and a side plate according to another embodiment of the battery pack of the present application.

[0028] Figure markings: battery module 1, first limiting member 2, second limiting member 3, box body 4, first channel 5, second channel A6, second channel B6', third channel 7, third limiting member 8, front end plate 41, rear end plate 42, top plate 43, bottom plate 44, side plate 45, first air supply channel 51, first connecting channel 52, second connecting channel 53, second air supply channel 71, third connecting channel 72, fourth connecting channel 73, air supply assembly 411, first vent 421, second vent 422, third vent 423. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] Embodiment 1 of the battery pack of the present application

[0032] refer to Figure 1 to Figure 2The battery pack of the present application comprises: a battery module 1, a first limiting member 2, a second limiting member 3 and a box body 4, wherein a plurality of the battery modules 1 are accommodated in the box body 4;

[0033] The box body 4 includes a front end plate 41, a rear end plate 42, a top plate 43, a bottom plate 44 and a side plate 45. The first limiting member 2 is arranged on the top plate 43 and abuts against the top surface of the battery module 1. A first channel 5 extending along the length direction of the battery module 1 is formed between the first limiting member 2 and the top surface of the battery module 1. A second channel A6 is formed between the side surface of the battery module 1 and the side plate 45 or an adjacent battery module 1. The second limiting member 3 is arranged on the bottom plate 44 and abuts against the bottom surface of the battery module 1. A third channel 7 extending along the length direction of the battery module 1 is formed between the second limiting member 3 and the bottom surface of the battery module 1, and the first channel 5, the second channel A6 and the third channel 7 are connected to each other. An air supply component 411 is arranged at a position corresponding to the first channel 5 on the front end plate 41, and a first vent 421 and a third vent 423 connected to the outside are arranged on the rear end plate 42, and the first vent 421 and the third vent 423 are arranged corresponding to the first channel 5 and the third channel 7, respectively.

[0034] refer to Figure 2 The box body 4 is used to accommodate multiple battery modules 1. The battery modules 1 are arranged in the box body 4. The battery module 1 is composed of multiple battery packs arranged in pairs, and is generally a rectangular cube with a predetermined length and width. The front end plate 41 and the rear end plate 42 of the box body 4 are respectively located at the two end positions of the battery module 1 in the length direction, the top plate 43 is located at the top of the battery module 1, the side plate 45 is located at the side position of the battery module 1 in the width direction, and the bottom plate 44 is located at the bottom of the battery module 1. The front end plate 41, the rear end plate 42, the top plate 43, the bottom plate 44 and the side plate 45 are connected to form a accommodating cavity for accommodating the battery module.

[0035] The first limiting member 2 is arranged on the side of the top plate 43 facing the inside of the box body 4. The first limiting member 2 can be formed integrally with the top plate 43. The first limiting member 2 includes a plurality of blocks of predetermined shapes, which are arranged at intervals from each other. The protruding heights of the blocks of the first limiting member 2 are the same, and the top surfaces of the blocks are all located in the same horizontal plane. When the battery module 1 is placed in the box body 4, the first limiting member 2 abuts against the top surface of the battery module 1 to form a first channel 5. In a specific implementation, in order to facilitate the abutment of the first limiting member 2 against the top surface of the battery module 1, the top plate 43 of the box body 4 can be set in the form of a detachable cover. After the battery module 1 is placed in the box body 4, the top plate 43 is covered on the top of the battery module 1 so that the first limiting member 2 abuts against the top surface of the battery module 1.

[0036] refer to Figures 2 to 3The first channel 5 includes a first air supply channel 51, a first connecting channel 52 and a second connecting channel 53. The first air supply channel 51 is extended along the length direction of the battery module 1, and its width gradually decreases from the front end plate 41 side to the rear end plate 42 side. The first connecting channel 52 and the second connecting channel 53 are respectively located on both sides of the first air supply channel 51, and are used to connect the second channels A6 on both sides of the battery module 1, wherein the width of the first connecting channel 52 is smaller than the width of the second connecting channel 53. In this embodiment, the first connecting channel 52 is connected in the form of multiple irregular criss-cross structures on the horizontal plane. The first air supply channel 51 corresponds to the middle position of the top of the battery module 1, where multiple explosion-proof valves of the battery module 1 are usually provided. The first connecting channel 52 and the second connecting channel 53 are both arranged parallel to the width direction of the battery module 1. One end of the first air supply channel 51 corresponds to the position of the air supply assembly 411 installed on the front end plate 41, and the other end of the first air supply channel 51 corresponds to the position of the first vent 421 on the rear end plate 42. The first air supply channel 51 is connected to the outside through the first vent 421.

[0037] In this embodiment, a first limiting member 2 is provided on the top plate 43 of the box body 4, so that when the battery module 1 is placed in the box body 4, the block body of the first limiting member 2 and the top surface of the battery module 1 are abutted against each other to form a first channel 5 for the cooling air blown by the air supply component 411 to pass through; a first channel 5 including a first air supply channel 51, a first connecting channel 52 and a second connecting channel 53 is provided, so that the cooling air blown from one end of the first channel 5 can be sent to the first vent 421 at the other end through the first air supply channel 51, so as to blow the high-temperature gas on the top of the battery module 1 to the outside, cool the top of the battery module 1 in real time, and at the same time, the cooling air blown in the first channel 5 is dispersed into the second channel A6 through the first connecting channel 52 and the second connecting channel 53 connected to the first air supply channel 51, so as to dissipate heat at the position of the second channel A6.

[0038] The battery modules 1 are spaced apart from each other in the box body 4, and a gap is also formed between the battery module 1 and the side plate 45 of the box body 4. The above gap forms a second channel A6. The width of the second channel A6 in the height direction of the battery module 1 is equal to the side of the battery module 1. The width of the second channel A6 in the width direction of the battery module 1 is a preset value. In this embodiment, the preset value is 1 cm. There is a gap with the same distance as the preset value between the side of the battery module 1 and the side plate 45 of the box body 4. Similarly, there is also a gap with the same distance as the preset value between adjacent battery modules 1. The above preset value can be adjusted accordingly according to actual conditions. A second vent 422 is provided at the position corresponding to the second channel A6 on the rear end plate 42. The cooling air flowing from the first channel 5 flows through the second channel A6 and is then sent to the outside through the second vent 422. In this embodiment, the second vent 422 may include a plurality of through holes of a predetermined shape. By setting the second vent 422 as a plurality of through holes of a predetermined shape, it is avoided that the opening on the rear end plate 42 is too large, so as to effectively protect the battery module 1 in the box body 4. In a specific implementation, in order to ensure that the battery modules 1 are spaced at a predetermined distance from each other, and the battery module 1 and the side plate 45 are spaced at a predetermined distance, a limiting portion may be provided at the edge of the second limiting member 3, and the position of the battery module 1 placed in the box body 4 is fixed by the limiting portion. The limiting portion may be provided as a stopper protruding upward from the edge of the second limiting member 3.

[0039] In this embodiment, the battery modules 1 are arranged at intervals in the box body 4, and the battery modules 1 are spaced apart from the side panels 45 of the box body 4, so that the second channels A6 for the cooling air blown by the first channels 5 can be formed on both sides of the battery modules 1, thereby achieving effective heat dissipation on the sides of the battery modules 1.

[0040] The second limiting member 3 is arranged on the side of the bottom plate 44 facing the inside of the box body 4. The second limiting member 3 can be formed integrally with the bottom plate 44. The second limiting member 3 includes a plurality of blocks of predetermined shapes. The blocks are spaced apart from each other. The protruding heights of the blocks of the second limiting member 3 are the same, and the top surfaces of the blocks are all located in the same horizontal plane. When the battery module 1 is placed in the box body 4, the second limiting member 3 is against the bottom surface of the battery module 1 to form a third channel 7.

[0041] refer to Figure 2 and Figure 4The third channel 7 includes a second air supply channel 71, a third connecting channel 72 and a fourth connecting channel 73. The second air supply channel 71 is extended along the length direction of the battery module 1. The third connecting channel 72 and the fourth connecting channel 73 are respectively located on both sides of the second air supply channel 71, and are used to connect the second channels A6 on both sides of the battery module 1, wherein the width of the third connecting channel 72 is smaller than the width of the fourth connecting channel 73. In this embodiment, the third connecting channels 72 are connected in a plurality of irregular tic-tac-toe structures on a horizontal plane. The second air supply channel 71 corresponds to the middle position of the top of the battery module 1. The third connecting channel 72 and the fourth connecting channel 73 are both arranged parallel to the width direction of the battery module 1. The end of the second air supply channel 71 close to the rear end plate corresponds to the position of the third vent 423 on the rear end plate 42. The second air supply channel 71 is connected to the outside through the third vent 423.

[0042] In this embodiment, a second limiting member 3 is provided on the bottom plate 44 of the box body 4, so that when the battery module 1 is placed in the box body 4, the block of the second limiting member 3 and the top surface of the battery module 1 are abutted against each other to form a third channel 7 for the cooling air blown from the second channel A6 to pass through; a second channel 7 including a second air supply channel 71, a third connecting channel 72 and a fourth connecting channel 73 is provided, so that the cooling air blown from the second channel A6 can pass through the third connecting channel 72 and the fourth connecting channel 73 to the second air supply channel 71, and then the second air supply channel 71 blows the high-temperature gas at the bottom of the battery module 1 to the outside through the third vent 423, thereby cooling the bottom of the battery module 1 in real time.

[0043] In this embodiment, the wind blown in the first channel 6 is divided into three directions. The first direction flows from one end of the first air supply channel 51 close to the front end plate 41 to the end of the first air supply channel 51 close to the rear end plate 42. Since the temperature at the top of the battery module 1 is the highest during operation, the width of the first air supply channel 51 is set to gradually decrease in the first direction, so that the cooling air blown out by the air supply component 411 gradually increases in the first air supply channel 51, so as to quickly discharge the high-temperature gas at the top of the battery module 1 to the outside. The second flow direction is from the first connection channel 52 to the second channel A6 to the third connection channel 72, and finally to the second air supply channel 71. The first connection channel 52 and the third connection channel 72 correspond to each other in the vertical direction. The second flow direction corresponds to the position between adjacent battery modules 1. Since the heat of this part is generated by two battery modules 1, the channel widths of the first connection channel 52 and the third connection channel 72 are set to a smaller width to speed up the flow speed of the cooling air in this flow direction, so that the high-temperature gas between the adjacent battery modules 1 can be quickly transferred to the second air supply channel 71 for discharge. The third flow direction is from the second connection channel 53 to the second channel A6 to the fourth connection channel 73, and finally to the second air supply channel 71. The second connection channel 53 and the fourth connection channel 73 correspond to each other in the vertical direction. The second flow direction corresponds to the position between the battery module 1 and the side plate 45. Since the heat of this part is generated by a single battery module 1, the channel widths of the second connection channel 53 and the fourth connection channel 73 are set to a larger width to increase the heat dissipation area and improve the heat dissipation effect.

[0044] In this embodiment, since the high temperature of the top surface, side surface and bottom surface of the battery module 1 gradually decreases during operation, an air supply assembly 411 is provided corresponding to the first channel 5 to partially discharge the high temperature gas in the first channel 5 through the first vent 421, and part of the high temperature gas is transferred to the second channel A6 through the first connecting channel 52 and the second connecting channel 53 of the first channel 5, and mixed with the high temperature gas in the second channel A6. The mixed gas is then partially discharged to the outside through the third vent 423 at one end of the second channel A6, and the remaining part of the mixed gas is then transferred to the second air supply channel 71 through the third connecting channel 72 and the fourth connecting channel 73 of the third channel 7, and finally discharged to the outside through the third vent 423 at one end of the second air supply channel 71. Through the above ventilation process, the high temperature gas of each part of the battery module 1 can be effectively discharged, and at the same time, since the temperature of the high temperature gas of the battery module 1 is gradually accumulated in the process from the first channel 5 to the second channel A6 to the third channel 7, the temperature of each part of the battery module is ensured to be uniform, and the uniform heat dissipation of the battery module 1 is effectively achieved.

[0045] In this embodiment, the diameter of the first vent 421 is smaller than the diameter of the first channel 5, the diameter of the first vent 421 refers to the maximum inner diameter of the first vent 421, and the diameter of the first channel 5 refers to the width of the first channel 5 near the first vent 421. By setting the diameter of the first vent 421 to be smaller than the diameter of the first channel 5, the cooling air passing through the first channel 5 is partially restricted in the first channel 5, so that the remaining cooling air can be transferred to the second channel A6 through the first connecting channel 52 and the second connecting channel 53 for heat dissipation; the diameter of the third vent 423 is larger than the diameter of the third channel 7, the diameter of the third vent 423 refers to the maximum inner diameter of the third vent 423, and the diameter of the third channel 7 refers to the width of the third channel 7 near the third vent 423. By setting the diameter of the third vent 423 to be smaller than the diameter of the third channel 7, the cooling air passing through the third channel 7 can quickly pass through the third vent 423 for heat dissipation.

[0046] An embodiment of the present application further provides an energy storage unit, which includes a battery pack and a mounting frame, wherein the battery pack is installed in the mounting frame for centralized power supply.

[0047] This embodiment adopts the energy storage unit of the battery pack as described above, so as to achieve uniform and effective heat dissipation of the battery module 1 and improve the heat dissipation efficiency of the battery module 1 .

[0048] Embodiment 2 of the battery pack of the present application

[0049] refer to Figure 5 In this embodiment, the battery pack also includes a third limiting member 8, which includes a plurality of spaced blocks having a predetermined shape. When the blocks are arranged on the side plate 45, they can be formed integrally with the side plate 45. When the blocks are sandwiched between adjacent battery modules 1, they can be connected to the front plate 41 or the rear plate 42 of the battery module 1, or the position of the battery module 1 in the box body 4 can be fixed by setting a limiting portion on the second limiting member 3 as mentioned above, and then the block structure is fixed to the side of the battery module 1 by adhesion for setting. In this embodiment, the second channel B6' is formed by abutting the third limiting member 3 against the side of the battery module 1.

[0050] refer to Figures 5 to 7The width of the second channel B6' gradually decreases in the vertical direction from the end connected to the first channel 5 to the end connected to the third channel 7. The first connecting channel 52 and the third connecting channel 72 are connected to the second channel B6' close to the adjacent battery module 1, and the width of the second channel B6' close to the adjacent battery module 1 is 1 / 2 of the sum of the widths of the first connecting channel 52 and the third connecting channel 72; the second connecting channel 53 and the fourth connecting channel 73 are connected to the second channel B6' close to the side plate 45, and the width of the second channel B6' close to the side plate is 1 / 2 of the sum of the widths of the second connecting channel 53 and the fourth connecting channel 73.

[0051] In this embodiment, the second channel B6' is arranged in an interval trapezoidal channel, the longer side of the trapezoidal channel is connected to the first channel 5, and the shorter side of the trapezoidal channel is connected to the third channel 7. The width of the second channel B6' refers to the middle width of the trapezoidal channel, which is 1 / 2 of the sum of the longest side and the shortest side of the trapezoidal channel.

[0052] In this embodiment, the width of the second channel B6' is set to gradually decrease from the end connected to the first channel 5 to the end connected to the third channel 7, so that the flow rate of the cooling air blown by the first channel 5 is accelerated when flowing through the second channel B6', so as to improve the heat dissipation efficiency in the second channel B6'. By setting the width of the second channel B6' to 1 / 2 of the sum of the widths of the corresponding connecting channels, the flow rate of the cooling air flowing through the second channel B6' is gradually increased, so as to improve the overall heat dissipation efficiency of the battery module 1.

[0053] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A battery pack, characterized in that: The battery pack comprises: a battery module (1), a first limiting member (2), a second limiting member (3) and a box (4), wherein a plurality of the battery modules (1) are accommodated in the box (4); The box body (4) comprises a front end plate (41), a rear end plate (42), a top plate (43), a bottom plate (44) and a side plate (45); the first limiting member (2) is arranged on the top plate (43) and abuts against the top surface of the battery module (1); a first channel (5) extending along the length direction of the battery module (1) is formed between the first limiting member (2) and the top surface of the battery module (1); a second channel A (6) is formed between the side surface of the battery module (1) and the side plate (45) or an adjacent battery module (1); the second limiting member (3) is arranged on the bottom plate (44) and abuts against the bottom surface of the battery module (1). A third channel (7) extending along the length direction of the battery module (1) is formed between the second limiting member (3) and the bottom surface of the battery module (1); the first channel (5), the second channel A (6) and the third channel (7) are connected to each other; an air supply component (411) is provided at a position corresponding to the first channel (5) on the front end plate (41); a first vent (421) and a third vent (423) communicating with the outside are provided on the rear end plate (42); the first vent (421) and the third vent (423) are provided corresponding to the first channel (5) and the third channel (7), respectively.

2. The battery pack according to claim 1, characterized in that: The first channel (5) comprises a first air supply channel (51), a first connecting channel (52) and a second connecting channel (53) which are connected to each other; the first air supply channel (51) extends along the length direction of the battery module (1), and the width of the first air supply channel (51) gradually decreases in the length direction of the battery module (1); the first connecting channel (52) and the second connecting channel (53) both extend along the width direction of the battery module (1) and are respectively connected to second channels A (6) located on both sides of the battery module (1); wherein the first connecting channel (52) is arranged close to an adjacent battery module (1), and the second connecting channel (53) is arranged close to the side plate (45); and the width of the first connecting channel (52) is smaller than the width of the second connecting channel (53).

3. The battery pack according to claim 2, characterized in that: The third channel (7) comprises a second air supply channel (71), a third connecting channel (72) and a fourth connecting channel (73) which are connected to each other. The second air supply channel (71) extends along the length direction of the battery module (1). The third connecting channel (72) and the fourth connecting channel (73) both extend along the width direction of the battery module (1) and are respectively connected to the second channels A (6) located on both sides of the battery module (1). The third connecting channel (72) is arranged close to the adjacent battery module (1), and the fourth connecting channel (73) is arranged close to the side plate (45).

4. The battery pack according to claim 3, characterized in that: The second channel A (6) is formed by the side of the battery module (1) and the side plate (45) or the interval between adjacent battery modules (1); the second channel A (6) is respectively connected to the first channel (5) and the third channel (7) on both sides along the height direction of the battery module (1); and a second vent (422) communicating with the outside is also provided at a position corresponding to the second channel A (6) on the rear end plate (42).

5. The battery pack according to claim 3, characterized in that: The battery pack further comprises: a third limiting member (8), the third limiting member (8) being arranged on the side plate (45) or sandwiched between adjacent battery modules (1), the third limiting member (8) being in contact with the side surface of the battery module (1) to form the second channel B (6'), the second channel B (6') being connected to the first channel (5) and the third channel (7) on both sides along the height direction of the battery module (1), and the width of the second channel B (6') gradually decreasing from the side connected to the first channel (5) to the side connected to the third channel (7).

6. The battery pack according to claim 5, characterized in that: The first connecting channel (52) and the third connecting channel (72) are connected to a second channel B (6') close to an adjacent battery module (1), and a width of the second channel B (6') close to an adjacent battery module (1) is 1 / 2 of a sum of a width of the first connecting channel (52) and a width of the third connecting channel (72); The second connecting channel (53) and the fourth connecting channel (73) are connected to the second channel B (6') close to the side plate (45), and the width of the second channel B (6') close to the side plate is 1 / 2 of the sum of the widths of the second connecting channel (53) and the fourth connecting channel (73).

7. The battery pack according to claim 4 or 6, characterized in that: The first connecting channel (52) and the third connecting channel (72) correspond to each other in a vertical direction, the second connecting channel (53) and the fourth connecting channel (73) correspond to each other in a vertical direction, the width of the third connecting channel (72) is smaller than the width of the first connecting channel (52), and the width of the fourth connecting channel (73) is smaller than the width of the second connecting channel (53).

8. The battery pack according to claim 7, characterized in that: The first channel (5) and the third channel (7) correspond to each other in the vertical direction, and the width of the third channel (7) is smaller than the width of the first channel (5).

9. The battery pack according to claim 8, characterized in that: The diameter of the first vent (421) is smaller than the diameter of the third vent (423), the width of the first channel (5) is larger than the diameter of the first vent (421), and the width of the third channel (7) is smaller than the diameter of the third vent (423).

10. An energy storage unit, characterized in that: The energy storage unit comprises a battery pack and a mounting frame as claimed in any one of claims 1 to 9, wherein the battery pack is installed in the mounting frame for centralized power supply.

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