Battery pack and energy storage device with same

Abstract

The utility model discloses a battery pack and an energy storage device with the same. The battery pack comprises a shell and at least one battery cell unit, the shell is provided with a containing cavity. The battery cell unit is arranged in the accommodating cavity and comprises a plurality of battery cells; the plurality of battery cells are arranged along a first direction. Wherein the length of the shell in the first direction is L, the width of the shell in the second direction is W, the height of the shell in the third direction is D, the first direction, the second direction and the third direction are mutually orthogonal, and L, W and D meet the following conditions: L is greater than or equal to 1800mm and less than or equal to 2200mm, W is greater than or equal to 720mmm and less than or equal to 810mm, and D is greater than or equal to 240mmm and less than or equal to 260mm. According to the battery pack disclosed by the utility model, the size of the shell is more suitable for being mounted in a box body of the energy storage device, meanwhile, the number of the battery packs can meet the standard size of a 20-foot cabinet and the requirement for 5MWh electric quantity, the miniaturization design of the energy storage device is facilitated, and the occupied space of the energy storage device during mounting is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a battery pack and an energy storage device having the same. Background Art

[0002] In the related art, container energy storage equipment includes a container and a battery pack installed in the container, wherein the battery pack usually adopts a traditional air-cooled battery pack or a 53-string liquid-cooled battery pack. However, most containers developed with 53-string battery packs are non-standard size containers, and the containers need to have doors on both sides (that is, both sides of the integrated box facing each other can be opened), which increases the manufacturing cost of the container and the difficulty of waterproof sealing. In addition, the size of the container energy storage equipment is large, and it occupies a large space during installation. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack, the size of the shell is more suitable for installation in the box of the energy storage device, and the number of battery packs can meet the standard size of a 20-foot cabinet and the 5MWh power requirement, and is conducive to the miniaturization design of the energy storage device, reducing the space occupied by the energy storage device during installation.

[0004] Another object of the present invention is to provide an energy storage device using the above-mentioned battery pack.

[0005] A battery pack according to an embodiment of the first aspect of the utility model includes: a shell having a accommodating cavity; at least one battery cell unit, the battery cell unit is arranged in the accommodating cavity, the battery cell unit includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction; wherein, the length of the shell in the first direction is L, the width of the shell in the second direction is W, the height of the shell in the third direction is D, the first direction, the second direction and the third direction are orthogonal to each other, wherein L, W and D satisfy: 1800mm≤L≤2200mm, 720mmm≤W≤810mm, 240mmm≤D≤260mm.

[0006] According to the battery pack of the embodiment of the utility model, the battery pack is packed into the energy storage device by making the length of the shell in the first direction meet 1800mm≤L≤2200mm, and the width of the shell in the second direction meet 720mmm≤W≤810mm. Therefore, compared with the traditional container energy storage equipment, the size of the shell is more suitable for installation in the box of the energy storage device, and the number of battery packs can meet the standard size of the 20-foot cabinet and the power demand of 5MWh, and it is conducive to the miniaturization design of the energy storage device, reducing the space occupied by the energy storage device during installation.

[0007] According to some embodiments of the utility model, the shell includes: a cover body, which is open on one side of the second direction; a heat sink, which is arranged on the open side of the cover body, and the heat sink and the cover body jointly define the accommodating cavity, and a plurality of limit bars are provided on the heat sink, and the plurality of limit bars are respectively located on both sides of the heat sink in the first direction, and the battery cell unit is located between the plurality of limit bars.

[0008] According to some embodiments of the utility model, there are multiple battery cell units, and the multiple battery cell units are arranged along the third direction. At least two of the battery cell units constitute a battery cell module. The outer periphery of the battery cell module is provided with at least one first restraint member, and the first restraint member provides restraint forces in multiple directions to the battery cell module, and at least one of the restraint forces in the multiple directions is parallel to the first direction.

[0009] According to some embodiments of the present invention, the battery pack further includes: a plurality of second restraints, which are respectively arranged on both sides of the battery cell module in the first direction, and each of the second restraints is located between the first restraint and the battery cell module.

[0010] According to some embodiments of the present invention, in the third direction, each of the second restraining members is located on a side of the limiting strip away from the heat dissipation plate.

[0011] According to some embodiments of the utility model, a low-voltage connector, at least one battery management unit and at least one high-voltage connector are provided on the outer peripheral surface of the cover body, the battery management unit is electrically connected to the battery cell module and the low-voltage connector respectively, and the high-voltage connector is electrically connected to the battery cell module.

[0012] According to some embodiments of the utility model, at least one fixing block is provided on the heat dissipation plate, and the fixing block is located on a side of the cover body away from the battery cell module, and the fixing block is used to fix the battery pack in the box of the energy storage device.

[0013] According to some embodiments of the present invention, a seal is provided between the cover and the heat dissipation plate.

[0014] According to some embodiments of the present utility model, an explosion-proof valve is provided on the housing.

[0015] According to the energy storage device of the embodiment of the second aspect of the utility model, it includes: a box body, the box body has an opening formed on one side in a first direction; a box door, the box door is rotatably arranged at the opening; a battery pack, the battery pack is arranged in the box body, the low-voltage connector, the high-voltage connector and the battery management unit of the battery pack are opposite to the opening, and the battery pack is the battery pack according to the embodiment of the first aspect of the utility model.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is an exploded view of a battery pack according to an embodiment of the utility model;

[0019] Figure 2 is a schematic diagram of a battery cell module and a heat sink according to an embodiment of the utility model;

[0020] Figure 3 is a schematic diagram of a battery pack according to an embodiment of the utility model, wherein a cover is not shown;

[0021] Figure 4 is a schematic diagram of a heat dissipation plate according to an embodiment of the utility model;

[0022] Figure 5 is an exploded view of a heat sink according to an embodiment of the utility model;

[0023] Figure 6 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0024] Figure 7 is a schematic diagram of an energy storage device according to an embodiment of the utility model;

[0025] Figure 8 is a schematic diagram of an energy storage device according to an embodiment of the utility model from another angle;

[0026] Fig. 9 It is a connection diagram of a series-parallel structure of battery cells 1 and 104 in series according to an embodiment of the utility model;

[0027] Fig.10 This is another connection schematic diagram of a series-parallel structure of battery cells 1 and 104 in series according to an embodiment of the utility model;

[0028] Fig.11 This is a connection diagram of a series-parallel structure of 2 cells in parallel and 52 cells in series according to an embodiment of the utility model;

[0029] Fig.12 This is another connection diagram of the series-parallel structure of 2 cells in parallel and 52 cells in series according to an embodiment of the utility model.

[0030] Reference numerals:

[0031] 100. Battery pack;

[0032] 1. Shell; 11. Cover; 111. Accommodating cavity; 12. Heat dissipation plate; 121. Limiting strip; 122. Fixing block; 123. Seal; 13. Explosion-proof valve; 14. Heat dissipation interface; 2. Battery unit; 21. Battery; 22. Battery module; 3. First restraint; 4. Second restraint; 5. Low-voltage connector; 6. High-voltage connector; 7. Battery management unit; 71. 52-string BMU; 72. Maintenance switch;

[0033] 200. Energy storage device;

[0034] 201. Box body; 202. Box door; 203. High-voltage control box. DETAILED DESCRIPTION

[0035] Reference below Figure 1-Figure 12 A battery pack 100 according to an embodiment of the first aspect of the present invention is described.

[0036] like Figure 1-Figure 12 As shown, a battery pack 100 according to an embodiment of the first aspect of the utility model includes a housing 1 and at least one battery cell unit 2.

[0037] Specifically, the shell 1 has a accommodating cavity 111. The battery cell unit 2 is arranged in the accommodating cavity 111, and the battery cell unit 2 includes a plurality of battery cells 21. In the description of the present utility model, "plurality" means two or more. The plurality of battery cells 21 are arranged along a first direction. Among them, the length of the shell 1 in the first direction is L, the width of the shell 1 in the second direction is W, and the height of the shell 1 in the third direction is D. The first direction, the second direction and the third direction are orthogonal to each other, and L, W and D satisfy: 1800mm≤L≤2200mm, 720mmm≤W≤810mm, 240mmm≤D≤260mm.

[0038] For example, in Figure 1-Figure 12 In the example, the length direction of the housing 1 (for example, Figure 1 The front-to-back direction in the figure) is the first direction, and the width direction of the housing 1 (for example, Figure 1 The left-right direction in the figure) is the second direction, and the height direction of the housing 1 (for example, Figure 1The vertical direction in the third direction is the vertical direction in the housing 111. A plurality of battery cells 21 are stacked in the first direction in the housing 111 to form a battery cell unit 2, and the battery cell unit 2 extends in the length direction of the housing 1. When the length of the housing 1 in the first direction is less than 1800 mm, the length of the housing 1 is short, and after the battery pack 100 is placed in the box 201 of the energy storage device 200, some space will be left on both sides of the battery pack 100 in the first direction, resulting in a decrease in the charge of the energy storage device 200, thereby reducing the working time of the energy storage device 200.

[0039] When the length of the housing 1 in the first direction is greater than 2200 mm, the length of the housing 1 is too long, and the battery pack 100 cannot be loaded into the box 201 of the energy storage device 200, or in other words, the size of the box 201 of the energy storage device 200 needs to be increased, thereby increasing the manufacturing cost. When the width of the housing 1 in the second direction is less than 720 mm, the width of the housing 1 is too small, which increases the number of battery packs 100 arranged in the box 201 of the energy storage device 200 and increases the cost of the battery pack 100.

[0040] When the width of the shell 1 in the second direction is greater than 810 mm, the width of the shell 1 is too wide, and the number of battery packs 100 placed in the box 201 of the energy storage device 200 will be reduced, which may not meet the use needs of the energy storage device 200. When the height of the shell 1 in the third direction is less than 240 mm, the height of the shell 1 is small, which will increase the number of battery packs 100 stacked in the box 201 of the energy storage device 200. When the height of the shell 1 in the third direction is greater than 260 mm, the height of the shell 1 is too high, and the number of battery packs 100 placed in the box 201 of the energy storage device 200 is reduced, which may not meet the use needs of the battery packs 100.

[0041] Therefore, by making the length of the shell 1 in the first direction satisfy 1800mm≤L≤2200mm, the width of the shell 1 in the second direction satisfy 720mmm≤W≤810mm, and the height of the shell 1 in the third direction satisfy 240mmm≤D≤260mm, the size of the battery pack 100 is suitable for arrangement in the box 201 of the energy storage device 200. At the same time, the number of battery packs 100 can meet the use requirements of the energy storage device 200, that is, meet the standard size of a 20-foot cabinet and the power requirement of 5MWh, and is conducive to the miniaturized design of the energy storage device 200, reducing the occupied space of the energy storage device 200 during installation.

[0042] According to the battery pack 100 of the embodiment of the utility model, the battery pack 100 is installed in the energy storage device 200 by making the length of the shell 1 in the first direction meet 1800mm≤L≤2200mm, and the width of the shell 1 in the second direction meet 720mm≤W≤810mm. Therefore, compared with the traditional container energy storage equipment, the size of the shell 1 is more suitable for installation in the box 201 of the energy storage device 200, and the number of battery packs 100 can meet the standard size of 20-foot cabinets and 5MWh power requirements, and is conducive to the miniaturization design of the energy storage device 200, reducing the space occupied by the energy storage device 200 during installation.

[0043] According to some embodiments of the utility model, the housing 1 includes a cover 11 and a heat sink 12. The cover 11 is open on one side in the third direction. The heat sink 12 is arranged on the open side of the cover 11, and the heat sink 12 and the cover 11 jointly define a receiving cavity 111. The heat sink 12 is provided with a plurality of limit bars 121, and the plurality of limit bars 121 are respectively located on both sides of the heat sink 12 in the first direction, and the battery cell 2 is located between the plurality of limit bars 121. Figure 1-Figure 6 , the cover body 11 and the heat sink 12 are arranged along the third direction, and the heat sink 12 is located on the lower side of the cover body 11. One side of the cover body 11 adjacent to the heat sink 12 is open, so that the cover body 11 and the heat sink 12 can cooperate and jointly define the accommodating cavity 111. Among them, the length of the heat sink 12 is greater than the length of the cover body 11. The edges of the heat sink 12 and the cover body 11 are both provided with through holes, and the shape of the through holes can be waist-shaped or circular, so that the fasteners pass through the through holes to fix the heat sink 12 to the cover body 11. A heat dissipation pipeline is provided inside the heat sink 12, and a cooling liquid can pass through the heat dissipation pipeline. The cooling liquid flowing in the heat dissipation pipeline can take away the heat generated by the battery cell 21 when it is working, so that the heat sink 12 can dissipate heat to the battery cell 21 and reduce the temperature of the battery pack 100.

[0044] The limit strips 121 extend along the width direction of the heat sink 12, and the number of the limit strips 121 may be two, and the two limit strips 121 are respectively located on both sides of the length direction of the heat sink 12. The battery cell unit 2 is placed on the heat sink 12, and the width direction of the battery cell unit 2 is consistent with the width direction of the heat sink 12. The battery cell unit 2 is located between the two limit strips 121, and both sides of the length direction of the battery cell unit 2 are stopped by the limit strips 121, so that the limit strips 121 limit the displacement of the battery cell unit 2 in the first direction, prevent the battery cell unit 2 from moving in the first direction, enhance the stability of the battery cell unit 2, and ensure that the battery cell unit 2 can work normally.

[0045] According to some embodiments of the present invention, there are multiple battery cell units 2, and the multiple battery cell units 2 are arranged along the second direction. At least two battery cell units 2 constitute a battery cell module 22. At least one first restraining member 3 is sleeved on the outer periphery of the battery cell module 22. The first restraining member 3 provides restraining forces in multiple directions to the battery cell module 22, and at least one of the restraining forces in the multiple directions is parallel to the first direction. Figure 1-Figure 3 As shown, a plurality of battery cell units 2 are arranged along the width direction of the heat sink 12, and the pole direction of the battery cell units 2 is arranged upward. The first restraint 3 extends along the circumference of the battery cell module 22, so that the first restraint 3 can provide a restraining force at each position of the periphery of the battery cell module 22 to ensure that the structure of the battery cell module 22 remains stable and prevent the battery cell module 22 from dispersing. Among them, the number of the first restraints 3 can be 2, and the two first restraints 3 are arranged at intervals along the third direction around the battery cell module 22. In this way, it can be ensured that at least two battery cell units 2 are kept fixed to prevent the battery cell module 22 from dispersing. Among them, the first restraint 3 can be a steel belt or a plastic steel belt.

[0046] Reference Figure 2 The number of the battery cell units 2 can be 4, and the 4 battery cell units 2 are arranged along the width direction of the heat sink 12, and every 2 battery cell units 2 constitute a battery cell module 22, and the number of the battery cell modules 22 formed is 2, and the 2 battery cell modules 22 are arranged along the width direction of the heat sink 12.

[0047] Such a configuration facilitates the series or parallel connection of multiple battery cells 2 , makes the arrangement of the battery cells 2 in the accommodating cavity 111 reasonable and orderly, and meets the number of battery cells 2 required by the battery pack 100 , which is beneficial to increasing the performance of the battery pack 100 .

[0048] According to some embodiments of the present invention, the battery pack 100 further includes a plurality of second restraints 4, which are respectively disposed on both sides of the battery module 22 in the first direction, and each second restraint 4 is located between the first restraint 3 and the battery module 22. Figure 1-Figure 3 In the example, the number of the second restraints 4 can be two, and the two second restraints 4 are respectively located on both sides of the length direction of the battery cell module 22, and the second restraints 4 are in contact with the outer peripheral surface of the length direction of the battery cell module 22. The first restraint 3 is sleeved on the outer periphery of the battery cell module 22 and the second restraint 4, so that the second restraint 4 is fixed on the outside of the battery cell module 22. In this way, the battery cell module 22 is fixed, the arrangement of the battery cell 21 is made more compact, the density of the battery cell module 22 is improved, and the space occupied by the battery cell module 22 is saved. When the battery cell 21 swells during operation, the second restraint 4 can reduce the swelling of the battery cell 21 to prevent the battery cell module 22 from being deformed to a large extent, thereby extending the service life of the battery pack 100.

[0049] It should be noted that the second restraining member 4 can be made of die-cast aluminum material or high-strength engineering plastic.

[0050] According to some embodiments of the present invention, each second restraining member 4 is located on a side of the limiting strip 121 away from the heat sink 12 in the third direction. Figure 1-Figure 3 , the second restraint 4 is placed above the limit strip 121, and the first restraint 3 is also located above the limit strip 121. In this way, the battery cell unit 2 is abutted against the limit strips 121 on both sides of the first direction, saving the space occupied by the battery cell module 22 in the first direction. At the same time, the limit strip 121 has a certain supporting effect on the second restraint 4, which facilitates the restraint of the first restraint 3 on the second restraint 4 and the battery cell module 22, further increasing the structural density of the battery cell module 22, improving the stability of the battery cell unit 2, and preventing the battery cell unit 2 from dispersing.

[0051] According to some embodiments of the present invention, the outer peripheral surface of the cover 11 is provided with a low-voltage connector 5, at least one battery management unit 7 and at least one high-voltage connector 6, the battery management unit 7 is electrically connected to the battery module 22 and the low-voltage connector 5 respectively, and the high-voltage connector 6 is electrically connected to the battery module 22. Figure 1-Figure 12 As shown, the cover 11 forms an opening on one side in the first direction, and the low voltage connector 5, at least one battery management unit 7 and at least one high voltage connector 6 are all located on the side of the opening formed in the length direction of the cover 11, and the low voltage connector 5, at least one battery management unit 7 and at least one high voltage connector 6 pass through the opening to be electrically connected to the battery module 22. The battery management unit 7 includes 52 strings of BMU 71 and a maintenance switch 72, etc.

[0052] The number of high-voltage connectors 6 can be 2, and the two high-voltage connectors 6 are respectively a positive high-voltage connector 6 and a negative high-voltage connector 6, and the positive high-voltage connector 6 and the negative high-voltage connector 6 are arranged at intervals in the third direction. The high-voltage connector 6 and the low-voltage connector 5 are respectively located on both sides or on the same side of the second direction, and the 52-string BMU 71 and the maintenance switch 72 are arranged on a side adjacent to the high-voltage connector 6.

[0053] Reference Figure 1-Figure 12 The battery pack 100 has a total of 4 battery cell units 2, each battery cell unit 2 includes 26 battery cells 21, and the number of battery cells 21 in the entire battery pack 100 is 104. The 26 battery cells 21 of each battery cell unit 2 can be a 1-in-26 series series-parallel structure, that is, all 26 battery cells 21 are connected in series to form a battery string. The battery cell module 22 is composed of two battery cell units 2, and the two battery cell units 2 are connected in series. The four battery cell units 2 in the battery pack 100 form two battery cell modules 22.

[0054] Reference Fig. 9 and Fig.10 The two battery cell modules 22 can be a series-parallel structure of 1 in parallel and 5 in series, that is, the 26 battery cells 21 of each battery cell unit 2 are connected in series, and the two battery cell units 2 of each battery cell module 22 are connected in series.

[0055] The positive electrode of the first battery module 22 is connected to the negative electrode of the second battery module 22 through the maintenance switch 72; or, the negative electrode of the first battery module 22 is connected to the positive electrode of the second battery module 22 through the maintenance switch 72. The positive electrode of the first battery module 22 is connected to the positive high voltage connector 6, and the negative electrode of the second battery module 22 is connected to the negative high voltage connector 6; or, the negative electrode of the first battery module 22 is connected to the negative high voltage connector 6, and the positive electrode of the second battery module 22 is connected to the positive high voltage connector 6. Fig. 9 and Fig.10 As shown, when the battery cell module 22 is a 1-in-52-in-series series-parallel structure, the single cell voltage and temperature of the first battery cell module 22 are collected by a 52-in-series BMU 71, and the single cell voltage and temperature of the second battery cell module 22 are collected by another 52-in-series BMU 71.

[0056] In the entire battery pack 100, the combination of the above two battery cell modules 22 is 1 in parallel and 10 in series, that is, two 1 in parallel and 52 in series battery cell modules 22 are connected in series. The above 1 in parallel and 10 in series structure can be achieved through different series connection methods of the battery cells 21, and the first battery cell module 22 of the battery pack 100 is always positive and the second battery cell module 22 is always negative output, or the first battery cell module 22 of the battery pack 100 is always negative and the second battery cell module 22 is always positive output.

[0057] In some optional embodiments, one battery cell unit 2 may also be a 2-in-parallel 13-in-series series-parallel structure, that is, it is composed of 13 groups of 2 parallel battery cells 21 connected in series. Fig.11 and Fig.12 As shown, the cell module 22 is composed of two cell units 2, and the combination of the two cell units 2 can be a 2-in-26-in-series series-parallel structure, that is, two 2-in-13-in-series cell units 2 are connected in series. In the entire battery pack 100, the combination of two cell modules can be a 2-in-52-in-series structure, that is, two 2-in-26-in-series cell modules 22 are connected in series.

[0058] When the cell module 22 is a 2-in-52 series series-parallel structure, the single cell voltage and temperature collection of the first cell module 22 and the single cell voltage and temperature collection of the second cell module 22 are collected through the 52-in-1 BMU 71. Among them, the communication control and power supply of the high-voltage control box 203 are transferred through the low-voltage connector 5 of the battery pack 100. In this way, the cell module 22 can realize a series-parallel structure of multiple modes, which can meet the various usage needs of the battery pack 100 and improve the application range of the battery pack 100.

[0059] According to some embodiments of the present invention, at least one fixing block 122 is disposed on the heat dissipation plate 12. The fixing block 122 is located on a side of the cover 11 away from the battery module 22. The fixing block 122 is used to fix the battery pack 100 in the box 201 of the energy storage device 200. For example, Figure 1-Figure 6 In the example, the fixing block 122 is disposed on one side of the heat sink 12 in the length direction, and the number of the fixing blocks 122 may be two, and the two fixing blocks 122 are respectively located at both ends of the heat sink 12 in the width direction, and the fixing blocks 122 are located outside the accommodating cavity 111. When the battery pack 100 is loaded into the box 201 of the energy storage device 200, the battery pack 100 can be pushed into the box 201 through the fixing block 122. When the battery pack 100 needs to be taken out of the box 201, the battery pack 100 can also be pulled out with the help of the fixing block 122, thereby facilitating the installation and removal of the battery pack 100, facilitating the maintenance of the battery pack 100, and improving the installation efficiency.

[0060] At least one heat dissipation interface 14 is provided on the heat dissipation plate 12, and the heat dissipation interface 14 is located on one side of the length direction of the heat dissipation plate 12, and the heat dissipation interface 14 is adjacent to the fixing block 122. Cooling liquid can be connected to the heat dissipation plate 12 through the heat dissipation interface 14, so that the heat dissipation plate 12 can achieve the heat dissipation function.

[0061] According to some embodiments of the present invention, a sealing member 123 is provided between the cover 11 and the heat sink 12. Figure 4 and Figure 5 As shown, the seal 123 is rectangular in shape, extends along the circumference of the heat sink 12, and is located on one side of the fixing block 122 adjacent to the center of the heat sink 12. The seal 123 can seal the cell module 22 with the heat sink 12 to prevent the heat sink 12 from leaking and causing damage to the cell module 22, thereby increasing the service life of the battery pack 100.

[0062] According to some embodiments of the present invention, an explosion-proof valve 13 is provided on the housing 1. Figure 1, the explosion-proof valve 13 is arranged on the side of the cover body 11 away from the low-voltage connector 5. The number of explosion-proof valves 13 can be 1 or 2. When the internal or external short circuit, overcharge, or collision of the battery module 22 occurs, gas will be generated inside the battery module 22, causing the battery module 22 to heat up and expand. At this time, the pressure inside the battery module 22 increases and cannot be released, which may cause the battery pack 100 to explode. By providing the explosion-proof valve 13, before the pressure of the battery pack 100 reaches the explosion limit, the explosion-proof valve 13 will crack and release gas, thereby avoiding the explosion of the battery pack 100, improving the safety of the battery pack 100, and extending the service life of the battery pack 100.

[0063] The energy storage device 200 according to the embodiment of the second aspect of the utility model comprises a box body 201, a box door 202 and a battery pack 100. The box body 201 is formed with an opening on one side in the first direction. The box door 202 is rotatably arranged at the opening. The battery pack 100 is arranged in the box body 201, and the low voltage connector 5, the high voltage connector 6 and the battery management unit 7 of the battery pack 100 are opposite to the opening. The battery pack 100 is the battery pack 100 according to the embodiment of the first aspect of the utility model.

[0064] like Figure 7 and Figure 8 As shown, the opening is formed in the width direction of the box body 201 (for example, Figure 7 The length direction of the battery pack 100 is consistent with the width direction of the box 201, and the width direction of the battery pack 100 is consistent with the length direction of the box 201 (for example, Figure 7 The thickness direction of the battery pack 100 is consistent with the height direction of the box body 201 (for example, Figure 7 Multiple battery packs 100 are arranged in an array in the box 201. The box 201 is a box of standard size of a 20-foot cabinet.

[0065] With such an arrangement, the energy storage device 200 only needs to be provided with a box door 202 on one side in the width direction, that is, the box body 201 of the energy storage device 200 can be opened on one side, so that the battery pack 100 can be taken out or installed on one side of the box body 201, thereby improving the grouping efficiency of the battery pack 100, improving the installation efficiency, saving the manufacturing cost of the box body 201 of the energy storage device 200, and also reducing the transportation cost, saving the space occupied by the energy storage device 200, and facilitating the sealing of the box body 201 of the energy storage device 200.

[0066] According to the energy storage device 200 of the embodiment of the utility model, by adopting the above-mentioned battery pack 100, the box body 201 can be set to have a single-sided door, thereby improving the grouping efficiency of the battery pack 100, meeting the 5MWh power demand, improving the installation efficiency, saving the manufacturing cost of the box body 201 of the energy storage device 200, and also reducing the transportation cost and saving the space occupied by the energy storage device 200.

[0067] Other structures and operations of the energy storage device 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0068] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0070] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing having a receiving cavity; At least one battery cell unit, the battery cell unit is arranged in the accommodating cavity, the battery cell unit includes a plurality of battery cells, and the plurality of battery cells are arranged along a first direction; wherein the length of the shell in the first direction is L, the width of the shell in the second direction is W, the height of the shell in the third direction is D, the first direction, the second direction and the third direction are orthogonal to each other, wherein L, W and D satisfy: 1800mm≤L≤2200mm, 720mmm≤W≤810mm, 240mmm≤D≤260mm.

2. The battery pack according to claim 1, characterized in that: The housing comprises: a cover body, wherein the cover body is open on one side of the second direction; A heat sink, the heat sink is arranged on the open side of the cover body, the heat sink and the cover body jointly define the accommodating cavity, a plurality of limit strips are arranged on the heat sink, the plurality of limit strips are respectively located on both sides of the heat sink in the first direction, and the battery cell unit is located between the plurality of limit strips.

3. The battery pack according to claim 2, characterized in that: There are multiple battery cell units, and the multiple battery cell units are arranged along the third direction. At least two of the battery cell units constitute a battery cell module. The outer periphery of the battery cell module is provided with at least one first restraint member, and the first restraint member provides restraint forces in multiple directions to the battery cell module, and at least one of the restraint forces in the multiple directions is parallel to the first direction.

4. The battery pack according to claim 3, characterized in that: Also includes: A plurality of second restraints are respectively arranged on both sides of the battery cell module in the first direction, and each of the second restraints is located between the first restraint and the battery cell module.

5. The battery pack according to claim 4, characterized in that: In the third direction, each of the second restraining members is located on a side of the limiting strip away from the heat dissipation plate.

6. The battery pack according to claim 3, characterized in that: The outer peripheral surface of the cover body is provided with a low-voltage connector, at least one battery management unit and at least one high-voltage connector. The battery management unit is electrically connected to the battery cell module and the low-voltage connector respectively, and the high-voltage connector is electrically connected to the battery cell module.

7. The battery pack according to claim 3, characterized in that: At least one fixing block is disposed on the heat dissipation plate. The fixing block is located on a side of the cover body away from the battery core module. The fixing block is used to fix the battery pack in the box of the energy storage device.

8. The battery pack according to any one of claims 2 to 7, characterized in that: A sealing member is provided between the cover body and the heat dissipation plate.

9. The battery pack according to claim 1, characterized in that: An explosion-proof valve is arranged on the shell.

10. An energy storage device, characterized in that: include: A box body, wherein the box body is formed with an opening on one side of the first direction; A box door, the box door is rotatably arranged at the opening; A battery pack, wherein the battery pack is arranged in the box, a low-voltage connector, a high-voltage connector and a battery management unit of the battery pack are opposite to the opening, and the battery pack is a battery pack according to any one of claims 1-9.

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