Battery pack and energy storage equipment

Abstract

The utility model provides a battery pack and energy storage equipment, the battery pack comprises a plurality of battery cells arranged at intervals and heat insulation pads arranged among the plurality of battery cells, the plurality of battery cells are divided into first battery cells and second battery cells, the first battery cells are adjacent to a high-risk area, and the second battery cells are adjacent to a low-risk area; wherein a first interval is formed between the first battery cell and the adjacent second battery cell, a second interval is formed between the two adjacent second battery cells, and the interval of the first interval is larger than that of the second interval. And differential heat insulation design is adopted, so that the first battery cells and the second battery cells are non-uniformly arranged. For the first battery cells adjacent to the high-risk area, the large first interval and the first heat insulation pad are utilized to obtain large heat insulation performance, heat spreading after the multiple first battery cells adjacent to the high-risk area are subjected to thermal runaway at the same time is effectively prevented, the heat spreading range is controlled within a certain range, and the thermal runaway protection effect is improved.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a battery pack and energy storage device. Background Technology

[0002] Battery packs in energy storage devices typically consist of multiple spaced-apart cells. To prevent the rapid spread of heat from a single cell to adjacent cells and the resulting chain reaction after thermal runaway, battery packs usually employ a thermal runaway-protected architecture: multiple cells are evenly spaced, with consistent spacing between every two cells, and are fitted with insulation material of uniform thickness. However, the thermal runaway-protected architecture described above is relatively simple, offering poor protection against thermal runaway and making it difficult to cope with the heat spread that can occur simultaneously from multiple cells located in different positions experiencing thermal runaway. Utility Model Content

[0003] In view of the above, it is necessary to provide a battery pack and energy storage device that can prevent the spread of fire caused by battery thermal runaway.

[0004] This application provides a battery pack for use in an energy storage device. The energy storage device includes a chassis, and the battery pack is housed within the chassis. The chassis has a high-risk area and a low-risk area. The battery pack includes a plurality of spaced-apart battery cells and thermal insulation pads disposed between the plurality of battery cells. The plurality of battery cells are divided into first battery cells and second battery cells. The first battery cells are adjacent to the high-risk area, and the second battery cells are adjacent to the low-risk area. A first gap is formed between the first battery cell and an adjacent second battery cell, and a second gap is formed between two adjacent second battery cells. The spacing of the first gap is greater than the spacing of the second gap. The plurality of thermal insulation pads are divided into first thermal insulation pads and second thermal insulation pads. The thermal insulation performance of the first thermal insulation pad is greater than that of the second thermal insulation pad. The first thermal insulation pad is disposed in the first gap, and the second thermal insulation pad is disposed in the second gap.

[0005] In some embodiments, the thickness of the first thermal insulation pad in the multiple cell arrangement directions is greater than the thickness of the second thermal insulation pad in the multiple cell arrangement directions.

[0006] In some embodiments, the thermal resistance of the first insulation pad is greater than that of the second insulation pad.

[0007] In some embodiments, a third gap is formed between two adjacent first cells, and the spacing of the first gap is greater than the spacing of the third gap.

[0008] In some embodiments, a heat insulation pad is disposed between the two sides of two adjacent cells facing each other.

[0009] In some embodiments, a conductive busbar is provided between the ends of two adjacent battery cells, and some heat is conducted through the conductive busbar.

[0010] In some embodiments, thermally conductive adhesive is provided at the end of the battery cell, and the thermally conductive adhesive is connected to the chassis.

[0011] In some embodiments, the energy storage device also includes a heating element housed within a chassis; the high-risk area is located closer to the heating element than the low-risk area.

[0012] In some embodiments, the chassis has a mounting surface that is close to the fixture when the chassis is installed and fixed; high-risk areas are positioned closer to the mounting surface than low-risk areas.

[0013] The second aspect of this application provides an energy storage device, which includes a chassis and a battery pack as provided in the first aspect, the battery pack being disposed inside the chassis.

[0014] The battery pack and energy storage device provided in this application employ a differentiated thermal insulation design, resulting in an uneven arrangement between the first and second battery cells. For the first battery cell adjacent to a high-risk area, a larger first gap and a first thermal insulation pad are used to achieve greater thermal insulation performance, enhancing the thermal runaway prevention effect. This increases the distance between the first battery cell adjacent to the high-risk area and the second battery cell adjacent to the low-risk area, increasing the thermal insulation performance from the first battery cell to the second battery cell. This effectively prevents the thermal runaway from occurring simultaneously in multiple first battery cells adjacent to the high-risk area, controlling the thermal runaway range within a certain area and improving the thermal runaway protection effect. Attached Figure Description

[0015] Figure 1 A schematic diagram of the appearance of the energy storage device provided in this application.

[0016] Figure 2 This is an exploded view of the battery pack, power conversion assembly, and chassis provided in this application.

[0017] Figure 3 This is a schematic diagram of the appearance of the battery pack provided in this application.

[0018] Figure 4 This is an exploded view of the battery pack provided in this application.

[0019] Figure 5 The chassis provided in this application is a top view of the first mounting method.

[0020] Figure 6 The top view of the chassis provided for this application using the second mounting method.

[0021] Figure 7 This is a schematic diagram of the structure of the battery cell and heat insulation pad assembly provided in this application.

[0022] Figure 8 This is a cross-sectional schematic diagram of the battery cell and heat insulation pad assembly provided in this application.

[0023] Figure 9 This is a schematic diagram showing the distribution of battery cells, high-risk areas, and low-risk areas provided in this application.

[0024] Figure 10 A schematic diagram of thermal diffusion for the first layout of the battery pack provided in this application.

[0025] Figure 11 A schematic diagram of thermal diffusion for a second layout of the battery pack provided in this application.

[0026] Explanation of main component symbols

[0027] 100. Battery pack; 10. Battery cell; 11. First battery cell; 12. Second battery cell; 20. Thermal insulation pad; 21. First thermal insulation pad; 22. Second thermal insulation pad; 23. Third thermal insulation pad; 30. Bracket; 40. Conductive busbar; 50. Thermally conductive adhesive; 200. Chassis; 201. Battery compartment; 202. Power compartment; 203. High-risk area; 204. Low-risk area; 205. Mounting surface; 300. Power conversion assembly; 400. Fixture. Detailed Implementation

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have a component that is centrally located. When a component is considered to be "set" on another component, it can be directly set on the other component or may also have a component that is centrally located.

[0030] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “equivalent to”, and any variations thereof, in the specification, claims, and foregoing description of the drawings, are intended to cover non-exclusive inclusion.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In existing battery pack thermal runaway protection solutions, uniform cell insulation is typically used to prevent thermal runaway. Taking a prismatic battery module as an example, the battery pack contains multiple evenly spaced cells, with an insulation layer between adjacent cells. All insulation layers are made of the same material and have the same thickness, resulting in consistent insulation performance. This uniform insulation layer prevents heat transfer between cells, thus preventing the spread of thermal runaway.

[0034] However, the aforementioned uniform heat insulation solution is insufficient to address situations where multiple cells experience simultaneous thermal runaway. In practical applications, under certain operating conditions, multiple cells within the battery pack may be simultaneously triggered into thermal runaway. Since uniform insulation is designed based on the energy released by a single cell's thermal runaway, it cannot effectively prevent heat propagation when two or more cells experience thermal runaway simultaneously, resulting in poor thermal runaway protection.

[0035] Furthermore, the amount of heat insulation material used in the above scheme is unreasonable, which increases costs and also increases the weight and volume of the battery pack, which is not conducive to improving the energy density of the battery pack.

[0036] Therefore, embodiments of this application provide a battery pack and energy storage device that effectively prevent thermal runaway.

[0037] Figure 1 A schematic diagram of the appearance of the energy storage device provided in this application. Figure 2 This is an exploded view of the battery pack, power conversion assembly, and chassis provided in this application.

[0038] like Figure 1 and Figure 2As shown, this application embodiment first provides a battery pack 100, which is applied to an energy storage device. The energy storage device can be a photovoltaic energy storage system, which includes a photovoltaic panel and an energy storage device, with the photovoltaic panel and the energy storage device electrically connected.

[0039] Photovoltaic panels can be placed outdoors to convert solar energy into direct current (DC) under sunlight and output it to energy storage devices. These energy storage devices can be installed indoors and connected to household appliances. They store the electrical energy generated by the photovoltaic panels and then supply that energy to the appliances.

[0040] Specifically, the energy storage device includes a battery pack 100, a chassis 200, and a power conversion component 300, both of which are housed within the chassis 200.

[0041] The power conversion component 300 can be one or more combinations of a DC-DC converter (DCDC) and a DC-AC inverter (DCAC). The power conversion component 300 is electrically connected to the battery pack 100 and is used to convert electrical energy for use by household appliances. The power conversion component 300 supports grid-connected or off-grid mode switching.

[0042] Figure 3 This is a schematic diagram of the appearance of the battery pack provided in this application. Figure 4 This is an exploded view of the battery pack provided in this application.

[0043] Please refer to the following: Figure 3 and Figure 4 The battery pack 100, also known as a battery module PACK (Packaged Assembly of Cells and Key Components), is an energy storage device that integrates a battery management module, a thermal management module, and multiple battery cells 10 within a support frame 30, used to store electrical energy generated by photovoltaic panels. In the example of this application, the battery pack 100 is a prismatic battery module, with the battery cells 10 generally square in shape. In other embodiments, the type of battery pack 100 can be configured according to actual needs.

[0044] In the example of this application, the chassis 200 has a battery compartment 201 and a power compartment 202, which are arranged vertically. The power conversion component 300 is disposed in the power compartment 202, and the battery pack 100 is disposed in the battery compartment 201.

[0045] Figure 5 The chassis provided in this application is a top view of the first mounting method. Figure 6 The top view of the chassis provided for this application using the second mounting method.

[0046] Please refer to the following: Figure 5 and Figure 6 In actual working scenarios, the chassis 200 needs to be installed on the fixed object 400, and at least one side of the chassis 200 is close to or connected to the fixed object 400. This side forms the mounting surface 205 of the chassis 200. That is, the mounting surface 205 is close to the fixed object 400 when the chassis 200 is installed and fixed.

[0047] In the description of this application, the side of an object refers to its periphery. The periphery of the chassis 200 consists of multiple side surfaces. For ease of understanding, the multiple side surfaces of the chassis 200 are defined below as the first side, the second side, the third side, and the fourth side. The first side is the front of the chassis 200, the second and fourth sides are the opposite side walls of the chassis 200, and the third side is the back of the chassis 200.

[0048] The fixed object 400 can be a supporting component such as a wall, column, or floor of a building. The chassis 200 can be installed in various ways. For example, in the first installation method, the chassis 200 is fixed to the ground and installed against a wall on one side. In this case, the third side of the chassis 200 is close to the wall, and the first, second, and fourth sides of the chassis 200 are unobstructed. In this case, the third side is the mounting surface 205.

[0049] For example, in the second installation method, the chassis 200 is fixed to the ground and installed against a corner of the wall. Then the third side of the chassis 200 is close to one of the walls, and the second side of the chassis 200 is close to another wall. The first and fourth sides of the chassis 200 are unobstructed. At this time, the second and third sides are both installation surfaces 205.

[0050] It is understood that the above installation methods are all illustrative examples. The specific installation method of the chassis 200 can be configured according to the requirements of the actual scenario, and can also be adjusted according to the site environment or safety requirements. This application does not impose any restrictions on this.

[0051] Figure 7 This is a schematic diagram of the structure of the battery cell and heat insulation pad assembly provided in this application. Figure 8 This is a cross-sectional schematic diagram of the battery cell and heat insulation pad assembly provided in this application.

[0052] Please refer to the following: Figure 7 and Figure 8 In this embodiment, the battery pack 100 includes a support 30, a plurality of spaced-apart battery cells 10, and a heat insulation pad 20 disposed between the plurality of battery cells 10. The plurality of battery cells 10 form a whole and are fixed within the support 30. The arrangement direction of the plurality of battery cells 10 is the X-axis direction shown in the figure, and the plurality of battery cells 10 form a row along the arrangement direction. Multiple rows of battery cells 10 can be fixed simultaneously within the support 30. A gap is formed between two adjacent battery cells 10, and the heat insulation pad 20 is disposed within the gap between two adjacent battery cells 10.

[0053] Figure 9 This is a schematic diagram showing the distribution of battery cells, high-risk areas, and low-risk areas provided in this application.

[0054] Please refer to the following: Figure 9 Specifically, the chassis 200 has a high-risk area 203 and a low-risk area 204. The high-risk area 203 and the low-risk area 204 can be divided according to the thermal runaway characteristics of the battery pack 100. The high-risk area 203 refers to the area with a greater risk of thermal runaway than the low-risk area 204, and the low-risk area 204 refers to the area with a smaller risk of thermal runaway than the high-risk area 203.

[0055] Specifically, high-risk area 203 can be an area with higher ambient temperature that is more likely to cause thermal runaway of battery cell 10, or an area that is close to flammable materials that is more likely to cause greater damage after thermal runaway of battery cell 10; low-risk area 204 can be an area with lower ambient temperature that is less likely to cause thermal runaway of battery cell 10, or an area that is far away from flammable materials, etc. The specific settings can be made according to the internal layout of chassis 200 or the installation environment of chassis 200.

[0056] The following is an example of the division between high-risk area 203 and low-risk area 204.

[0057] For example, the energy storage device also includes a heat source, which is housed within the chassis 200. The high-risk area 203 is closer to the heat source than the low-risk area 204. The heat source refers to electronic components that easily generate significant heat during operation, such as transistors and capacitors in the power conversion assembly 300.

[0058] For example, high-risk area 203 can be an area where the distance between the inside of the chassis 200 and the heat source is less than a specified distance, and low-risk area 204 can be an area where the distance between the inside of the chassis 200 and the heat source is greater than a specified distance. The specific distance can be configured according to the heat source's heating temperature, heating speed, etc.

[0059] Because the heat-generating element emits heat during operation, areas within the chassis 200 near the heat-generating element may experience rapid temperature rise or high temperatures. Battery cells 10 located near this area are susceptible to thermal runaway due to environmental influences; therefore, this area can be defined as a high-risk area 203. Conversely, areas within the chassis 200 far from the heat-generating element do not experience rapid temperature rise or high temperatures. Battery cells 10 located near this area are less likely to experience thermal runaway due to environmental influences; therefore, this area can be defined as a low-risk area 204.

[0060] For example, high-risk area 203 is located closer to the mounting surface 205 than low-risk area 204. For instance, high-risk area 203 can be an area where the distance from the inside of the chassis 200 to the mounting surface 205 is less than a specified distance, while low-risk area 204 can be an area where the distance from the inside of the chassis 200 to the heat source exceeds a specified distance. The specific distance can be configured based on the ignition point, area, etc., of the mounting surface 205.

[0061] Because a large amount of heat will be generated after the battery cell 10 experiences thermal runaway, the temperature of the area adjacent to the battery cell 10 inside the chassis 200 will rise. Since the mounting surface 205 is located near the fixed object 400, if the mounting surface 205 is close to this area, it is easy to cause damage or even combustion to the fixed object 400 near the mounting surface 205, leading to further disasters. Therefore, this area can be defined as a high-risk area 203. If the mounting surface 205 is far from this area, it is less likely to affect the fixed object 400 near the mounting surface 205. Therefore, this area can be defined as a low-risk area 204.

[0062] In this embodiment, the multiple battery cells 10 can be divided into first battery cells 11 and second battery cells 12. The first battery cell 11 is adjacent to the high-risk area 203, and the second battery cell 12 is adjacent to the low-risk area 204. A first interval T1 is formed between the first battery cell 11 and the adjacent second battery cell 12, and a second interval T2 is formed between two adjacent second battery cells 12. The spacing of the first interval T1 is greater than the spacing of the second interval T2.

[0063] Corresponding to the division of the first interval T1 and the second interval T2, the multiple heat insulation pads 20 can be divided into the first heat insulation pad 21 and the second heat insulation pad 22. The heat insulation performance of the first heat insulation pad 21 is greater than that of the second heat insulation pad 22. The first heat insulation pad 21 is disposed in the first interval T1, and the second heat insulation pad 22 is disposed in the second interval T2.

[0064] It is understood that multiple cells 10 within the battery pack 100 are insulated from each other by multiple heat insulation pads 20, preventing any one cell 10 from conducting heat to adjacent cells 10, thus achieving a basic thermal propagation protection architecture. Based on this, a differentiated heat insulation design is adopted, dividing the battery pack 100 into high-risk areas 203 and low-risk areas 204 according to its thermal runaway characteristics, and creating an uneven arrangement between the first cell 11 and the second cell 12.

[0065] For the first battery cell 11 adjacent to the high-risk area 203, a larger first gap T1 and a first heat insulation pad 21 are used to achieve greater heat insulation performance and enhance the heat spread prevention effect. In this way, the distance between the first battery cell 11 adjacent to the high-risk area 203 and the second battery cell 12 adjacent to the low-risk area 204 can be increased, which can increase the heat insulation performance from the first battery cell 11 to the second battery cell 12, effectively preventing the heat spread after multiple first battery cells 11 adjacent to the high-risk area 203 experience thermal runaway simultaneously, controlling the heat spread range within a certain range, and improving the thermal runaway protection effect.

[0066] For the second cell 12 adjacent to the low-risk area 204, a smaller second spacing is used to achieve a dense arrangement, which is beneficial to reduce the amount of heat insulation material used in the second heat insulation pad 21, reduce the weight and volume of the battery pack 100, and is more conducive to improving the energy density of the battery pack 100.

[0067] In some embodiments, the heat insulation pad 20 is disposed between the two sides of two adjacent battery cells 10 facing each other. This improves the heat insulation effect of the heat insulation pad 20 between two adjacent battery cells 10.

[0068] In some embodiments, the thickness of the first heat insulation pad 21 in the arrangement direction of the plurality of battery cells 10 is greater than the thickness of the second heat insulation pad 22 in the arrangement direction of the plurality of battery cells 10. For example, the first heat insulation pad 21 fills a first interval T1, and the second heat insulation pad 22 fills a second interval T2, such that the thickness of the first heat insulation pad 21 is equal to the spacing of the first interval T1, and the thickness of the second heat insulation pad 22 is equal to the spacing of the second interval T2.

[0069] Thus, by making the thickness of the first heat insulation pad 21 greater than that of the second heat insulation pad 22, the heat insulation performance of the first heat insulation pad 21 is greater than that of the second heat insulation pad 22, thereby achieving a differentiated heat insulation effect.

[0070] In some embodiments, the thermal resistance of the first heat insulation pad 21 is greater than that of the second heat insulation pad 22. The first heat insulation pad 21 and the second heat insulation pad 22 are made of different heat insulation materials so that the first heat insulation pad 21 and the second heat insulation pad 22 have different thermal resistances, so that the heat insulation performance of the first heat insulation pad 21 is greater than that of the second heat insulation pad 22, thereby achieving differentiated heat insulation effects.

[0071] The thermal insulation materials include, but are not limited to, aerogel, CR foam (chloroprene rubber foam), silicone foam, ceramicized foam, mica materials, graphite composite materials, etc., and can be configured according to actual needs.

[0072] In some embodiments, a third gap T3 is formed between two adjacent first cells 11, and the spacing of the first gap T1 is greater than the spacing of the third gap T3. The heat insulation pad 20 can also be divided into a third heat insulation pad 23, which is disposed in the third gap T3, and the thickness of the third heat insulation pad 23 is equal to the spacing of the third gap T3. In this way, the spacing between two adjacent first cells 11 can be reduced while meeting the requirements for thermal runaway protection, thereby reducing the overall volume of the battery pack 100.

[0073] In another implementation (such as) Figure 11 As shown), the spacing of the first interval T1 can also be equal to the spacing of the third interval T3.

[0074] In some embodiments, a conductive busbar 40 is provided between the ends of two adjacent battery cells 10, and some heat is conducted through the conductive busbar 40. For example, the conductive busbar 40 can be an aluminum busbar. Each battery cell 10 has a head end and an end end; the head end of the battery cell 10 has a tab, and the conductive busbar 40 is electrically connected to the tab. Multiple conductive busbars 40 are provided, and multiple battery cells 10 establish a series circuit through multiple conductive busbars 40.

[0075] In actual operation, some of the heat at the beginning of the battery cell 10 can be dissipated through convection and radiation, while another part of the heat can be diffused through the conductive busbar 40. This optimizes the heat conduction path and reduces local overheating.

[0076] In some embodiments, the end of the battery cell 10 is provided with thermally conductive adhesive 50, which is connected to the chassis 200. For example, the end of the battery cell 10 passes through the bracket 30 and is bonded and fixed to the chassis 200 by the thermally conductive adhesive 50. During actual operation, some of the heat from the end of the battery cell 10 can be dissipated to the chassis 200 through the thermally conductive adhesive 50, thus optimizing the heat conduction path and reducing localized overheating.

[0077] For ease of understanding, the following description uses an example of the layout of the battery pack 100 as an example.

[0078] Figure 10 A schematic diagram of thermal diffusion for the first layout of the battery pack provided in this application.

[0079] Please refer to the following: Figure 10 In the first layout, there are 6 battery cells 10, which are: battery cell 10A, battery cell 10B, battery cell 10C, battery cell 10D, battery cell 10E, and battery cell 10F. Among them, battery cells 10C and 10D belong to the first battery cell 11, and battery cells 10A, 10B, 10E, and 10F belong to the second battery cell 12.

[0080] A second gap T2 is formed between battery cell 10A and battery cell 10B, a first gap T1 is formed between battery cell 10B and battery cell 10C, a third gap T3 is formed between battery cell 10C and battery cell 10D, a first gap T1 is formed between battery cell 10D and battery cell 10E, and a second gap T2 is formed between battery cell 10E and battery cell 10F.

[0081] The first interval T1 can be 5mm, and the first heat insulation pad 21 within the first interval T1 can be made of aerogel material. The second interval T2 can be 1mm, and the second heat insulation pad 22 within the second interval T2 can be made of CR foam material. The third interval T3 can be 1mm, and the third heat insulation pad 23 within the third interval T3 can be made of CR foam material.

[0082] Assuming that cell 10C experiences thermal runaway, the heat diffusion paths of cell 10C include the first path S1, the second path S2, the third path S3, the fourth path S4, the fifth path S5, and the sixth path S6.

[0083] First path S1: 105W of heat is conducted from cell 10C to cell 10B.

[0084] Second path S2: 529W of heat is conducted from cell 10C to cell 10D.

[0085] The third path S3: The heat generated by the 10C cell through convection is 85W.

[0086] Fourth path S4: The heat dissipation from the 10C cell is 75W.

[0087] Fifth path S5: The heat conducted by cell 10C through busbar 40 is 54W.

[0088] Sixth path S6: The heat conducted by cell 10C through thermally conductive adhesive 50 is 649W.

[0089] In this way, the heat spread between each cell 10 is controlled within the range of cell 10C and cell 10D, effectively preventing the spread to cell 10B or cell 10E. At the same time, the heat at cell 10C can be quickly dissipated through thermal adhesive 50, conductive busbar 40, convection heat dissipation, and radiation heat dissipation, optimizing the heat conduction path and ensuring that heat can be quickly dissipated to avoid local overheating.

[0090] Figure 11 A schematic diagram of thermal diffusion for a second layout of the battery pack provided in this application.

[0091] Please refer to the following: Figure 11In the second layout, there are 6 battery cells 10, which are: battery cell 10A, battery cell 10B, battery cell 10C, battery cell 10D, battery cell 10E, and battery cell 10F. Among them, battery cells 10C and 10D belong to the first battery cell 11, and battery cells 10A, 10B, 10E, and 10F belong to the second battery cell 12.

[0092] A second gap T2 is formed between battery cell 10A and battery cell 10B, a first gap T1 is formed between battery cell 10B and battery cell 10C, a third gap T3 is formed between battery cell 10C and battery cell 10D, a first gap T1 is formed between battery cell 10D and battery cell 10E, and a second gap T2 is formed between battery cell 10E and battery cell 10F.

[0093] The first interval T1 can be 5mm apart, and the first heat insulation pad 21 within the first interval T1 can be made of aerogel material. The second interval T2 can be 1mm apart, and the second heat insulation pad 22 within the second interval T2 can be made of CR foam material. The third interval T3 can be 5mm apart, and the third heat insulation pad 22 within the third interval T3 can be made of CR foam material.

[0094] It is understood that the above-described layout of each battery cell 10 is merely an illustrative example. In actual application scenarios, the number, spacing, and layout of the battery cells 10 can be adjusted according to actual needs, and this application does not impose any restrictions on this.

[0095] like Figure 1 and Figure 2 As shown in the embodiments of this application, an energy storage device is also provided. The energy storage device includes a chassis 200, a power conversion component 300, and a battery pack 100 as in any of the above embodiments, wherein the battery pack 100 and the power conversion component 300 are housed within the chassis 200.

[0096] The working principle and beneficial effects of the energy storage device provided in this application can be specifically described in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A battery pack, characterized in that, The device is used in an energy storage device, which includes a chassis and a battery pack housed within the chassis. The chassis has a high-risk area and a low-risk area. The battery pack includes a plurality of spaced-apart battery cells and a heat insulation pad disposed between the plurality of battery cells, wherein the plurality of battery cells are divided into a first battery cell and a second battery cell, the first battery cell being adjacent to the high-risk area and the second battery cell being adjacent to the low-risk area; The first battery cell forms a first gap with the adjacent second battery cell, and a second gap forms between two adjacent second battery cells. The spacing of the first gap is greater than the spacing of the second gap. The plurality of heat insulation pads are divided into a first heat insulation pad and a second heat insulation pad. The heat insulation performance of the first heat insulation pad is greater than that of the second heat insulation pad. The first heat insulation pad is disposed in the first gap, and the second heat insulation pad is disposed in the second gap.

2. The battery pack according to claim 1, characterized in that, The thickness of the first heat insulation pad in the plurality of cell arrangement directions is greater than the thickness of the second heat insulation pad in the plurality of cell arrangement directions.

3. The battery pack according to claim 1, characterized in that, The thermal resistance of the first heat insulation pad is greater than that of the second heat insulation pad.

4. The battery pack according to claim 1, characterized in that, A third gap is formed between two adjacent first cells, and the spacing of the first gap is greater than the spacing of the third gap.

5. The battery pack according to claim 1, characterized in that, The heat insulation pad is disposed between the two sides of two adjacent battery cells facing each other.

6. The battery pack according to claim 1, characterized in that, A conductive busbar is provided between the ends of two adjacent battery cells, and some of the heat is conducted through the conductive busbar.

7. The battery pack according to claim 1, characterized in that, The end of the battery cell is provided with thermally conductive adhesive, which is connected to the chassis.

8. The battery pack according to any one of claims 1-7, characterized in that, The energy storage device also includes a heating element, which is housed within the chassis. The high-risk area is closer to the location of the heating element than the low-risk area.

9. The battery pack according to any one of claims 1-7, characterized in that, The chassis has a mounting surface that is close to the fixing object when the chassis is installed and fixed. The high-risk area is closer to the mounting surface than the low-risk area.

10. An energy storage device, characterized in that, The energy storage device includes a chassis and a battery pack as described in any one of claims 1-9, wherein the battery pack is disposed within the chassis.

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