Battery pack and electric device

Abstract

The application relates to the technical field of battery packs, and provides a battery pack and a power utilization equipment. The battery pack of the application comprises a shell body with a cavity, a plurality of battery cell assemblies arranged in the cavity, the shell body comprises a shell body with a cavity, and a partition arranged in the shell body, the partition divides the cavity into a plurality of accommodating cavities, at least two battery cell assemblies are arranged in the at least two accommodating cavities, and the types of the battery cell assemblies in the at least two accommodating cavities are different; the battery pack can be provided with at least two groups of battery cell assemblies of different types, and the two groups of battery cell assemblies are spaced apart under the action of a cover body and a sealing unit, so that the battery pack can improve the energy density, the cycle life and the low-temperature applicability of the battery, and the multi-dimensional performance requirements of the battery pack are considered, so that the overall reliability of the battery pack is improved.

Description

Technical Field

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

[0002] As a crucial component of energy storage systems, battery packs play an indispensable role in numerous fields. In the automotive industry, battery packs are the core power source of vehicles, and their performance directly affects the vehicle's range, power output, and safety performance.

[0003] In related technologies, the battery modules in a battery pack typically use a single type of cell. Since the cells in a battery pack are all of the same type, it is difficult for the battery pack to meet multi-dimensional performance requirements, which is not conducive to improving the overall reliability of the battery pack. Utility Model Content

[0004] In view of this, this application aims to provide a battery pack that can improve the overall reliability of the battery pack.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] A battery pack includes a housing with a cavity, a plurality of battery cell assemblies disposed within the cavity, a cover sealing the cavity, and a sealing unit disposed between the housing and the cover.

[0007] The housing includes a housing body having the cavity, and a partition disposed within the housing body, the partition dividing the cavity into multiple receiving cavities, at least two of the receiving cavities containing the battery cell assembly, and the battery cell assembly in at least two of the receiving cavities being of different types;

[0008] The cover is connected to both the housing body and the partition, and seals off multiple accommodating cavities;

[0009] The sealing unit includes multiple sealing portions that are arranged one-to-one with the multiple receiving cavities, and each sealing portion is used to seal the corresponding receiving cavity.

[0010] Furthermore, the battery pack also includes a plurality of explosion-proof valves disposed on the housing body, and the plurality of explosion-proof valves are configured one-to-one with the receiving cavity where the battery cell assembly is disposed.

[0011] Furthermore, each of the sealing portions is a sealing strip disposed along the edge of the corresponding receiving cavity, the sealing strip being connected to the cover and the housing by fasteners; and / or, the plurality of sealing portions are integrally formed.

[0012] Furthermore, the housing body includes a cooling plate forming the bottom wall of the receiving cavity, and the battery cells in the battery cell assembly are bonded to the cooling plate by adhesive; the cooling plate is provided with a flow channel for coolant to circulate.

[0013] Furthermore, the cooling plate includes an upper plate body bonded to the battery cell assembly, and a lower plate body disposed at the bottom of the upper plate body; the portion of the upper plate body bonded to the battery cell assembly is planar, and the lower plate body has a downwardly protruding portion, the protruding portion and the upper plate body forming the flow channel.

[0014] Furthermore, the housing body also includes a bottom protective plate disposed below the cooling plate; the gap z between the bottom of the battery cell assembly and the bottom protective plate and the height h of the battery cell assembly satisfy: z≥0.08h.

[0015] Furthermore, the receiving cavity containing the battery cell assembly is elongated, and each battery cell assembly includes a plurality of battery cells arranged sequentially along the width direction of the corresponding receiving cavity, the thickness direction of the battery cells being consistent with the width direction of the corresponding receiving cavity; and / or, the cover is connected to the housing body, the partition and the sealing unit together by threaded fasteners, and the housing body and the partition are each provided with a plurality of threaded fasteners arranged at intervals.

[0016] Furthermore, a filler is sandwiched between two adjacent cells in each of the cell assemblies, and the filler defines a preset gap between the two adjacent cells; the preset gap i and the thickness c of the cell satisfy: i / c=0.01-0.08.

[0017] Furthermore, the plurality of accommodating cavities include a first accommodating cavity and a second accommodating cavity arranged side by side and accommodating the battery cell assembly, and a third accommodating cavity disposed on one side of the first accommodating cavity and the second accommodating cavity; the battery cell in the battery cell assembly in the first accommodating cavity is a lithium iron phosphate battery cell, the battery cell in the battery cell assembly in the second accommodating cavity is a ternary lithium battery cell, and the first accommodating cavity and the second accommodating cavity have the same length, the width d of the first accommodating cavity and the width e of the second accommodating cavity satisfy: d / e = 0.3-1, and the third accommodating cavity accommodates the electrical components of the battery pack.

[0018] Compared with related technologies, this application has the following advantages:

[0019] (1) The battery pack described in this application, by setting the housing body and the separator, divides the cavity into multiple receiving cavities, and at least two receiving cavities are provided with different types of battery cell components. This setting allows the battery pack to be provided with at least two sets of different types of battery cell components, and the two sets of battery cell components are spaced apart from each other under the action of the cover and the sealing unit. This helps to take into account the multi-dimensional performance requirements of the battery pack in terms of improving the energy density of the battery pack, improving the cycle life of the battery, and improving the low temperature applicability, so as to improve the overall reliability of the battery pack.

[0020] (2) By setting explosion-proof valves on the housing body that correspond one-to-one with the accommodating cavities containing the battery cell components, when the gas pressure in any accommodating cavity becomes too high due to abnormal conditions such as overcharging or overheating of the battery cell component, the explosion-proof valve corresponding to the accommodating cavity can be opened independently in time to release the high-pressure gas in the accommodating cavity, thereby preventing the high-pressure gas from accumulating in the accommodating cavity and effectively reducing the impact on the battery cell components in other accommodating cavities, so as to help improve the safety of the battery pack.

[0021] (3) By setting a sealing strip along the edge of the corresponding receiving cavity and using fasteners to tightly connect the cover and sealing strip to the housing body, it is possible to effectively prevent moisture and dust from the external environment from entering the receiving cavity and to effectively improve the sealing performance between two adjacent receiving cavities. At the same time, setting multiple sealing parts in one piece helps to improve the connection reliability between adjacent sealing parts and helps to assemble the sealing parts between the cover and the housing body.

[0022] (4) By setting a cooling plate and attaching the battery cell assembly to the cooling plate with an adhesive, the heat generated by the battery cell assembly can be transferred to the cooling plate. During the flow of the coolant in the flow channel, the heat on the cooling plate is continuously carried away, so as to effectively reduce the temperature of the battery cell assembly and ensure the reliability of the battery pack.

[0023] (5) By setting the part where the upper plate is bonded to the cell assembly to be a plane, it helps to increase the contact area between the upper plate and the cell assembly, thereby increasing the heat transfer area between the cell assembly and the upper plate. This allows the heat generated by the cell assembly to be quickly and evenly transferred to the cooling plate, which helps to quickly reduce the temperature of the cell assembly and ensure the reliability of the battery pack.

[0024] (6) By setting a bottom protective plate under the cooling plate, it helps to protect the cell assembly and improve the overall structural strength of the battery pack. At the same time, the gap z between the bottom of the cell assembly and the bottom protective plate is set to satisfy the following condition with respect to the height h of the cell assembly: z≥0.08h, so that a certain buffer space is formed between the bottom protective plate and the cell assembly. When the bottom protective plate is subjected to external impact, this buffer space has a certain buffering effect, which helps to improve the safety of the battery pack.

[0025] (7) By setting the receiving cavity to be elongated and making the thickness direction of the battery cell consistent with the width direction of the receiving cavity, the spatial structure characteristics of the elongated receiving cavity can be fully utilized, the battery cell layout can be optimized, and the internal space utilization of the battery pack can be improved. At the same time, the cover is connected to the housing body, the separator and the sealing unit through multiple spaced threaded fasteners, which helps to improve the connection reliability and sealing between the cover and the housing body.

[0026] (8) By setting a filler between two adjacent cells, a preset gap is formed between the two adjacent cells, thereby providing buffer protection for the two adjacent cells using the filler. At the same time, the preset gap i and the thickness c of the cell satisfy i / c=0.01-0.08, so that a heat dissipation channel is formed between the adjacent cells, effectively avoiding overheating of the cells caused by heat accumulation, and helping to improve the safety of the battery pack.

[0027] (9) By using lithium iron phosphate cells in the first cavity and ternary lithium phosphate cells in the second cavity, and with the first and second cavities having the same length and a width that satisfies the ratio d / e = 0.3-1, the high energy density of ternary lithium phosphate cells and the high safety and long life of lithium iron phosphate cells are complemented to optimize the overall energy density and safety performance of the battery pack, taking into account the multi-dimensional performance requirements of the battery pack, so as to improve the overall reliability of the battery pack.

[0028] This application also proposes an electrical device having a battery pack as described above.

[0029] The electrical equipment described in this application, by setting up the battery pack as described above, helps to take into account the multi-dimensional performance requirements of the battery pack in terms of improving battery pack energy density, improving battery cycle life and improving low temperature adaptability, so as to improve the overall reliability of the battery pack and enhance the power reliability of the electrical equipment. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the battery pack described in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the shell body and cavity described in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram showing the battery cell assembly located inside the cavity according to an embodiment of this application;

[0034] Figure 4 This is a partial exploded view of the battery pack described in the embodiments of this application;

[0035] Figure 5 for Figure 1 A magnified view of part F in the middle section;

[0036] Figure 6 This is a partial exploded view of the battery pack described in the embodiments of this application;

[0037] Figure 7 This is an exploded view of the cooling plate described in the embodiments of this application;

[0038] Figure 8 for Figure 7 A magnified view of part G in the middle;

[0039] Figure 9 This is a schematic diagram showing the positional relationship between the bottom of the battery cell and the bottom protective plate as described in the embodiments of this application;

[0040] Figure 10 This is a schematic diagram of the cell arrangement as described in the embodiments of this application;

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Shell; 101. Cover; 102. Shell body; 1021. Cooling plate; 10211. Upper plate; 10212. Lower plate; 10213. Protruding part; 1021b. Flow channel; 1022. Bottom guard plate; 103. Separator;

[0043] 2. Battery cell assembly; 201. Battery cell;

[0044] 3. Sealing unit; 301. Sealing part; 3011. Sealing strip; 302. Fastener; 303. Sealing element;

[0045] 4. Explosion-proof valve;

[0046] 5. Threaded fasteners;

[0047] 6. Filler;

[0048] 7. Electrical components;

[0049] a. Cavity; a1. Receiving cavity; a11. First receiving cavity; a12. Second receiving cavity; a13. Third receiving cavity; i. Preset gap. Detailed Implementation

[0050] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0052] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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 in light of the specific circumstances.

[0054] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0056] An embodiment of the first aspect of this application provides a battery pack that is used in electrical equipment, such as in a vehicle, to provide power to the vehicle. Through its innovative design, the battery pack can adapt to different environments and meet multi-dimensional performance requirements, thereby improving the overall reliability of the battery pack.

[0057] In related technologies, the battery modules in a battery pack typically use a single type of cell 201, such as ternary lithium cells, lithium iron phosphate cells, or sodium bicarbonate cells. If only ternary lithium cells are used, the battery pack will have poor thermal stability at high temperatures. If only lithium iron phosphate cells are used, the battery pack will have low energy density. If only sodium bicarbonate cells are used, the battery pack will have low cycle life. Therefore, using the same type of cell 201 in the battery pack makes it difficult for the battery pack to meet multi-dimensional performance requirements, which is not conducive to improving the overall reliability of the battery pack.

[0058] In view of this, in order to overcome the shortcomings of the related technology, the battery pack of this embodiment combines... Figures 1 to 4 As shown, the overall design includes a housing 1 with a cavity a, multiple battery cell assemblies 2 disposed in the cavity a, a cover 101 that seals the cavity a, and a sealing unit 3 disposed between the housing 1 and the cover 101.

[0059] The housing 1 includes a housing body 102 with a cavity a, and a partition 103 disposed within the housing body 102. The partition 103 divides the cavity a into multiple receiving cavities a1. At least two receiving cavities a1 are provided with battery cell assemblies 2, and the types of battery cell assemblies 2 in the at least two receiving cavities a1 are different. The cover 101 is connected to both the housing body 102 and the partition 103, and seals the multiple receiving cavities a1. The sealing unit 3 includes multiple sealing parts 301 that are disposed one-to-one with the multiple receiving cavities a1. Each sealing part 301 is used to seal the corresponding receiving cavity a1.

[0060] Therefore, by setting the housing body 102 and the separator 103, the cavity a is divided into multiple receiving cavities a1, and at least two receiving cavities a1 are provided with different types of battery cell assemblies 2. This arrangement allows the battery pack to be provided with at least two sets of different types of battery cell assemblies 2, and the two sets of battery cell assemblies 2 are spaced apart by the cover 101 and the sealing unit 3. This helps to take into account the multi-dimensional performance requirements of the battery pack in terms of improving the energy density, improving the cycle life of the battery, and improving the low temperature adaptability, so as to improve the overall reliability of the battery pack.

[0061] Based on the above overview, specifically, the cell 201 in cell assembly 2 can be a ternary lithium battery cell, a lithium iron phosphate battery cell, or a sodium hydroxide battery cell. The specific type of cell assembly 2 is determined according to the design requirements of the battery pack. By using a ternary lithium battery cell for cell 201, cell assembly 2 can achieve higher energy density, storing more energy within the same volume of battery casing 1, resulting in longer device runtime, and stable energy release even at low temperatures. By using a lithium iron phosphate battery cell for cell 201, cell assembly 2 can achieve good thermal stability, reducing the risk of thermal runaway and providing an ultra-long cycle life. By using a sodium hydroxide battery cell for cell 201, cell 201 can be charged quickly, and the battery assembly can operate stably at high or low temperatures.

[0062] Understandably, continuing the combination Figures 1 to 4 As shown, as a specific configuration of the housing body 102, in this embodiment, there are two accommodating cavities a1 for the battery cell assembly 2. Therefore, the battery cells 201 of the battery cell assembly 2 in the two accommodating cavities a1 can be ternary lithium battery cells and lithium iron phosphate battery cells, or ternary lithium battery cells and sodium battery cells, or lithium iron phosphate battery cells and sodium battery cells.

[0063] In detail, in some exemplary embodiments, the plurality of receiving cavities a1 include a first receiving cavity a11 and a second receiving cavity a12 arranged side by side and accommodating the battery cell assembly 2, and a third receiving cavity a13 disposed on one side of the first receiving cavity a11 and the second receiving cavity a12.

[0064] Among them, the battery cell 201 in the battery cell assembly 2 in the first receiving cavity a11 is a lithium iron phosphate battery cell, the battery cell 201 in the battery cell assembly 2 in the second receiving cavity a12 is a ternary lithium battery cell, and the lengths of the first receiving cavity a11 and the second receiving cavity a12 are the same. The width d of the first receiving cavity a11 and the width e of the second receiving cavity a12 satisfy: d / e=0.3-1. The third receiving cavity a13 contains the electrical components 7 of the battery pack.

[0065] Therefore, by using lithium iron phosphate cells for the battery cell assembly 2 in the first cavity a11 and ternary lithium batteries for the battery cell assembly 2 in the second cavity a12, and by ensuring that the first cavity a11 and the second cavity a12 have the same length and their widths satisfy the ratio d / e=0.3-1, the high energy density of ternary lithium batteries and the high safety and long lifespan of lithium iron phosphate cells are complemented, thereby optimizing the overall energy density and safety performance of the battery pack and taking into account the multi-dimensional performance requirements of the battery pack, thus improving the overall reliability of the battery pack.

[0066] It is understood that the ratio between the width d of the first receiving cavity a11 and the width e of the second receiving cavity a12, i.e., d / e, can be 0.3, 0.4, 0.5, 0.7 or 1. In this embodiment, d / e is preferably 0.5. This setting enables the battery pack to have high energy density while also having good thermal stability, reducing the risk of thermal runaway of cell 201 and extending the cycle life of the battery pack.

[0067] In some of the exemplary implementations, combined with Figure 1 , Figure 4 and Figure 5 As shown, the battery pack also includes a plurality of explosion-proof valves 4 disposed on the housing body 102, and the plurality of explosion-proof valves 4 are configured one-to-one with the receiving cavity a1 containing the battery cell assembly 2.

[0068] Therefore, by providing explosion-proof valves 4 on the housing body 102 that correspond one-to-one with the receiving cavities a1 containing the battery cell assembly 2, when the gas pressure in any receiving cavity a1 becomes too high due to abnormal conditions such as overcharging or overheating of the battery cell assembly 2, the explosion-proof valve 4 corresponding to the receiving cavity a1 can be opened independently and in a timely manner to release the high-pressure gas in the receiving cavity a1, thereby preventing the high-pressure gas from accumulating in the receiving cavity a1 and effectively reducing the impact on the battery cell assembly 2 in other receiving cavities a1, which helps to improve the safety of the battery pack.

[0069] The explosion-proof valve 4 can be the common explosion-proof valve 4 installed on the battery pack shell, and the specific model and assembly form of the explosion-proof valve 4 can be selected according to the size of the shell body 102.

[0070] In some of the exemplary implementations, combined with Figure 1 and Figure 4 As shown, each sealing part 301 is a sealing strip 3011 provided along the edge of the corresponding receiving cavity a1. The sealing strip 3011 is connected to the cover 101 and the housing 1 by fasteners 302; multiple sealing parts 301 are integrally formed.

[0071] Therefore, by setting a sealing strip 3011 along the edge of the corresponding receiving cavity a1, and using fasteners 302 to tightly connect the cover 101 and the sealing strip 3011 to the housing body 102, it is possible to effectively prevent moisture and dust from the external environment from entering the receiving cavity a1, and to effectively improve the sealing performance between two adjacent receiving cavities a1, thereby improving the overall sealing performance of the battery pack. At the same time, setting multiple sealing parts 301 integrally molded helps to improve the connection reliability between adjacent sealing parts 301, facilitates the molding and production of sealing parts 301, and helps to assemble sealing parts 301 between the cover 101 and the housing body 102.

[0072] It is worth noting that the sealing strip 3011 can be made of silicone rubber, fluororubber, or EPDM rubber, which gives the sealing strip 3011 a certain degree of elasticity, allowing it to better fit the cover 101 and the housing body 102, thus helping to ensure the overall sealing of the battery pack. Furthermore, it is understood that the fastener 302 can be a rivet or a screw; to facilitate the connection between the cover 101 and the housing body 102, in this embodiment, a screw is preferred as the fastener 302.

[0073] In some of the exemplary implementations, combined with Figure 2 as well as Figures 6 to 8 As shown, the housing body 102 includes a cooling plate 1021 that forms the bottom wall of the receiving cavity a1, and the battery cell 201 in the battery cell assembly 2 is bonded to the cooling plate 1021 by adhesive; the cooling plate 1021 is provided with a flow channel 1021b for coolant to flow.

[0074] As described above, by setting up a cooling plate 1021 and attaching the battery cell assembly 2 to the cooling plate 1021 with an adhesive, the heat generated by the battery cell assembly 2 can be transferred to the cooling plate 1021. During the flow of the coolant in the flow channel 1021b, it can continuously exchange heat with the cooling plate 1021, thereby effectively reducing the temperature of the battery cell assembly 2 and ensuring the reliability of the battery pack.

[0075] It is understood that the battery cell assembly 2 is attached to the cooling plate 1021 by adhesive. In order to ensure that the battery cell assembly 2 can be securely connected to the cooling plate 1021 and that the cooling plate 1021 can cool the battery cell assembly 2, in this embodiment, the battery cell assembly 2 is preferably attached to the cooling plate 1021 by thermally conductive structural adhesive.

[0076] In detail, in some of the exemplary implementations, the following continues to be combined Figure 2 as well as Figures 6 to 8 As shown, the cooling plate 1021 includes an upper plate 10211 bonded to the battery cell assembly 2, and a lower plate 10212 disposed at the bottom of the upper plate 10211; the part of the upper plate 10211 bonded to the battery cell assembly 2 is a plane, and the lower plate 10212 has a downwardly protruding portion 10213, which together with the upper plate 10211 forms a flow channel 1021b.

[0077] Therefore, by setting the part where the upper plate 10211 is bonded to the cell assembly 2 to be a plane, it helps to increase the contact area between the upper plate 10211 and the cell assembly 2, thereby increasing the heat transfer area between the cell assembly 2 and the upper plate 10211. This allows the heat generated by the cell assembly 2 to be quickly and evenly transferred to the cooling plate 1021, which helps to quickly reduce the temperature of the cell assembly 2 and ensure the reliability of the battery pack.

[0078] Based on the above introduction, in some of the exemplary implementations, combined with Figure 6 and Figure 9 As shown, the housing body 102 also includes a bottom protective plate 1022 disposed below the cooling plate 1021; the gap z between the bottom of the cell assembly 2 and the bottom protective plate 1022 satisfies the condition that z ≥ 0.08h with respect to the height h of the cell assembly 2. In this embodiment, for example, z = 0.08h, z = 0.09h, z = 0.1h, or z = 0.11h can be set. In this preferred embodiment, z = 0.1h is set to balance the relationship between the bottom protective plate 1022 and the bottom of the cell assembly 2 having a certain buffer gap and the overall size of the battery pack.

[0079] Therefore, by setting a bottom protective plate 1022 below the cooling plate 1021, it helps to provide additional protection for the cell assembly 2 and improve the overall structural strength of the battery pack. At the same time, the gap z between the bottom of the cell assembly 2 and the bottom protective plate 1022 is set to satisfy the condition that z ≥ 0.08h with respect to the height h of the cell assembly 2, so that a certain buffer space is formed between the bottom protective plate 1022 and the cell assembly 2. When the bottom protective plate 1022 is subjected to external impact, this buffer space has a certain buffering effect, which helps to improve the safety of the battery pack.

[0080] It is worth noting that when the bottom guard plate 1022 and the cooling plate 1021 are mounted on the housing body 102, a clearance groove is provided at the edge of the cooling plate 1021 where the flow channel 1021b is not provided. Bolts are then used to connect the bottom guard plate 1022 and the clearance groove to the housing body 102, thus clamping the cooling plate 1021 between the bottom guard plate 1022 and the cooling plate 1021, completing the assembly of the cooling plate 1021 and the bottom guard plate 1022. It is understood that to increase the sealing between the cooling plate 1021 and the housing body 102, a sealing element 303 is provided between the cooling plate 1021 and the housing body 102 during assembly. The sealing element 303 is positioned along the edge of the receiving cavity a1, and after assembly, the sealing element 303 presses firmly between the cooling plate 1021 and the housing body 102.

[0081] In some of the exemplary implementations, the combination continues... Figures 1 to 4 As shown, the cavity a1 containing the battery cell assembly 2 is elongated, and each battery cell assembly 2 includes multiple battery cells 201 arranged sequentially along the width direction of the corresponding cavity a1. The thickness direction of the battery cell 201 is consistent with the width direction of the corresponding cavity a1. The cover 101 is connected to the housing body 102, the partition 103 and the sealing unit 3 by threaded fasteners 5, and multiple threaded fasteners 5 are arranged at intervals on the housing body 102 and the partition 103.

[0082] Therefore, by setting the receiving cavity a1 to be elongated and making the thickness direction of the battery cell 201 consistent with the width direction of the receiving cavity a1, the spatial structural characteristics of the elongated receiving cavity a1 are fully utilized, the layout of the battery cell 201 is optimized, and the internal space utilization rate of the battery pack is improved. Specifically, the large surface of the battery cell 201 is parallel to the separator 103. When the battery cell 201 expands, the separator 103 resists the expansion force generated by the battery cell 201, making the overall structure of the battery pack more stable.

[0083] Meanwhile, the cover 101 is connected to the housing body 102, the partition 103, and the sealing unit 3 by a plurality of spaced threaded fasteners 5, which helps to improve the reliability of the connection and the sealing performance between the cover 101 and the housing body 102. It is understood that both the housing body 102 and the partition 103 are provided with a plurality of spaced threaded fasteners 5. In this embodiment, the number of threaded fasteners 5 on the partition 103 is not less than 20, and the plurality of threaded fasteners 5 are distributed at equal intervals on the partition 103. Similarly, the threaded fasteners 5 are also distributed at the same intervals on the housing body 102. The threaded fasteners 5 can be common bolts available on the market, as long as the cover 101 is connected to the housing body 102, the partition 103, and the sealing unit 3 by means of the threaded fasteners 5.

[0084] In some of the exemplary implementations, combined with Figure 3 and Figure 10 As shown, a filler 6 is sandwiched between two adjacent cells 201 in each cell assembly 2. The filler 6 defines a preset gap i between two adjacent cells 201. The preset gap i and the thickness c of the cell 201 satisfy the condition: i / c = 0.01-0.08. In this embodiment, for example, i / c = 0.01, i / c = 0.03, i / c = 0.04, i / c = 0.06, or i / c = 0.08 can be set. In this preferred embodiment, i / c = 0.04 is set in this way to achieve a balanced and compact arrangement of the cells 201, and to meet the requirement of buffer protection between the cells 201 by setting a preset gap i between them.

[0085] Therefore, by placing a filler 6 between two adjacent cells 201, a preset gap i is created between them, thus providing buffer protection for the adjacent cells 201 using the filler 6. Simultaneously, the preset gap i and the thickness c of the cell 201 satisfy the condition: i / c = 0.01-0.08, forming a heat dissipation channel between adjacent cells 201. This effectively prevents overheating of the cells 201 due to heat accumulation, contributing to improved battery pack safety.

[0086] It is worth noting that the filler 6 can be made of thermal insulation material, such as aerogel or ceramic fiber. In this embodiment, the filler 6 is preferably made of aerogel, which can ensure the spacing between adjacent cells 201 while also providing a certain degree of thermal insulation. Of course, the filler 6 can also be made of insulating plastic sheet, as long as it meets the requirement of maintaining the spacing between two adjacent cells 201.

[0087] It is worth noting that, regarding the battery pack of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 10 As shown, it includes a housing 1 with a cavity a, a plurality of battery cell assemblies 2 disposed in the cavity a, a cover 101 sealing the cavity a, and a sealing unit 3 disposed between the housing 1 and the cover 101.

[0088] The housing 1 includes a housing body 102 with a cavity a, and a partition 103 disposed within the housing body 102. The partition 103 divides the cavity a into multiple receiving cavities a1. At least two receiving cavities a1 are provided with battery cell assemblies 2, and the types of battery cell assemblies 2 in the at least two receiving cavities a1 are different. The cover 101 is connected to both the housing body 102 and the partition 103, and seals the multiple receiving cavities a1. The sealing unit 3 includes multiple sealing parts 301 that are disposed one-to-one with the multiple receiving cavities a1. Each sealing part 301 is used to seal the corresponding receiving cavity a1.

[0089] Furthermore, the battery pack also includes multiple explosion-proof valves 4 disposed on the housing body 102, and the multiple explosion-proof valves 4 are configured one-to-one with the receiving cavity a1 containing the battery cell assembly 2.

[0090] The cavity a1 containing the battery cell assembly 2 is elongated, and each battery cell assembly 2 includes multiple battery cells 201 arranged sequentially along the width direction of the corresponding cavity a1. The thickness direction of the battery cell 201 is consistent with the width direction of the corresponding cavity a1. The cover 101 is connected to the housing body 102, the partition 103 and the sealing unit 3 by threaded fasteners 5, and multiple threaded fasteners 5 are arranged at intervals on the housing body 102 and the partition 103.

[0091] The battery pack of this embodiment adopts the above design. By setting the housing body 102 and the separator 103, the cavity a is divided into multiple receiving cavities a1, and at least two receiving cavities a1 are provided with different types of battery cell assemblies 2. This arrangement allows the battery pack to be provided with at least two sets of different types of battery cell assemblies 2. Under the action of the cover 101 and the sealing unit 3, the two sets of battery cell assemblies 2 are spaced apart from each other. This helps to take into account the multi-dimensional performance requirements of the battery pack in terms of improving the energy density of the battery pack, improving the cycle life of the battery, and improving the low temperature adaptability, so as to improve the overall reliability of the battery pack.

[0092] An embodiment of the second aspect of this application provides an electrical device having a battery pack as described in the first aspect.

[0093] The electrical equipment described in this application, such as a vehicle, can benefit from the multi-dimensional performance requirements of the battery pack by installing a battery pack as described in the first aspect on the vehicle. This can improve the overall reliability of the battery pack and enhance the power reliability of the vehicle and other electrical equipment.

[0094] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that: It includes a housing with a cavity, a plurality of battery cell assemblies disposed within the cavity, a cover that seals the cavity, and a sealing unit disposed between the housing and the cover; The housing includes a housing body having the cavity, and a partition disposed within the housing body, the partition dividing the cavity into multiple receiving cavities, at least two of the receiving cavities containing the battery cell assembly, and the battery cell assembly in at least two of the receiving cavities being of different types; The cover is connected to both the housing body and the partition, and seals off multiple accommodating cavities; The sealing unit includes multiple sealing portions that are arranged one-to-one with the multiple receiving cavities, and each sealing portion is used to seal the corresponding receiving cavity.

2. The battery pack according to claim 1, characterized in that: The battery pack also includes a plurality of explosion-proof valves disposed on the housing body, and the plurality of explosion-proof valves are configured one-to-one with the receiving cavity containing the battery cell assembly.

3. The battery pack according to claim 1, characterized in that: Each of the sealing portions is a sealing strip disposed along the edge of the corresponding receiving cavity, the sealing strip being connected to the cover and the housing by fasteners; and / or, The multiple sealing components are integrally formed.

4. The battery pack according to claim 1, characterized in that: The housing body includes a cooling plate that forms the bottom wall of the receiving cavity, and the battery cells in the battery cell assembly are bonded to the cooling plate by adhesive. The cooling plate has channels for the flow of coolant.

5. The battery pack according to claim 4, characterized in that: The cooling plate includes an upper plate body bonded to the battery cell assembly, and a lower plate body disposed at the bottom of the upper plate body; The upper plate is bonded to the cell assembly at a planar surface, and the lower plate has a downwardly protruding portion, which together with the upper plate forms the flow channel.

6. The battery pack according to claim 4, characterized in that: The housing body also includes a bottom protective plate disposed below the cooling plate; The gap z between the bottom of the battery cell assembly and the bottom protective plate satisfies the following condition with respect to the height h of the battery cell assembly: z ≥ 0.08h.

7. The battery pack according to claim 1, characterized in that: The receiving cavity accommodating the battery cell assembly is elongated, and each battery cell assembly includes a plurality of battery cells arranged sequentially along the width direction of the corresponding receiving cavity, the thickness direction of the battery cells being consistent with the width direction of the corresponding receiving cavity; and / or, The cover is connected to the housing body, the partition and the sealing unit by threaded fasteners, and the housing body and the partition are provided with a plurality of threaded fasteners arranged at intervals.

8. The battery pack according to claim 7, characterized in that: Each of the battery cell assemblies has a filler sandwiched between two adjacent battery cells, and the filler defines a preset gap between the two adjacent battery cells; The preset gap i and the thickness c of the battery cell satisfy the following condition: i / c = 0.01-0.

08.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The plurality of receiving cavities include a first receiving cavity and a second receiving cavity arranged side by side and accommodating the battery cell assembly, and a third receiving cavity disposed on one side of the first receiving cavity and the second receiving cavity; The battery cells in the battery cell assembly in the first receiving cavity are lithium iron phosphate cells, the battery cells in the battery cell assembly in the second receiving cavity are ternary lithium batteries, and the lengths of the first receiving cavity and the second receiving cavity are the same. The width d of the first receiving cavity and the width e of the second receiving cavity satisfy: d / e = 0.3-1. The third receiving cavity contains the electrical components of the battery pack.

10. An electrical appliance, characterized in that: The electrical equipment is provided with a battery pack as described in any one of claims 1 and 9.

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