Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system. The battery pack comprises a shell and at least one partition plate, the shell comprises a bottom plate and a peripheral side frame, the bottom plate and the peripheral side frame are connected to form a containing cavity, the containing cavity is used for containing a plurality of battery modules, and the bottom plate is used for fixing the battery modules. And the at least one partition plate is accommodated in the accommodating cavity, each partition plate is arranged between two adjacent battery modules, each partition plate is connected with the bottom plate in a sealing manner, and two ends of each partition plate are connected with the peripheral side frame in a sealing manner. In the application, the at least one partition plate is used for dividing the accommodating cavity into a plurality of cabins. As the partition plate is hermetically connected with the bottom plate and the peripheral side frame, electrolyte leaked from the battery module is limited in a cabin where the battery module is located. And the electrolyte is prevented from flowing to other cabins due to the arrangement of the partition plates. And the flowing range of the electrolyte is reduced, the mutual influence of liquid leakage between different cabins is reduced, and the insulation reliability between the battery modules of the different cabins is improved, so that the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an energy storage system. Background Art

[0002] There is a risk of electrolyte leakage during transportation or operation of the battery pack. The leaked electrolyte flows inside the battery pack shell and corrodes the insulation film of other battery modules in the battery pack, causing insulation failure between multiple battery modules. Insulation failure between battery modules may cause the risk of fire or even explosion of the battery pack. Utility Model Content

[0003] The present application provides a battery pack and an energy storage system, which can reduce the risk of electrolyte leakage in the battery pack while ensuring the reliability and heat dissipation effect of the battery pack.

[0004] In a first aspect, the present application provides a battery pack, the battery pack comprising a shell and at least one partition, the shell comprising a bottom plate and a peripheral side frame, the bottom plate and the peripheral side frame are connected to form a receiving cavity, the receiving cavity is used to receive a plurality of battery modules, and the bottom plate is used to fix the plurality of battery modules. At least one partition is received in the receiving cavity, each of the partitions is arranged between two adjacent battery modules, each of the partitions is sealed to the bottom plate, and both ends of each of the partitions are sealed to the peripheral side frame.

[0005] In an embodiment of the present application, at least one partition is used to separate the accommodating cavity into a plurality of compartments. Since the partition is sealed and connected to the bottom plate and the surrounding side frame, the electrolyte leaked from the battery module is confined to the compartment where the battery module is located. The provision of the partition blocks the electrolyte from flowing to other compartments. The flow range of the electrolyte is reduced, the mutual influence of leakage between different compartments is reduced, and the insulation reliability between battery modules in different compartments is improved, thereby improving the safety performance of the battery pack. In addition, the partition is used to implement leakage protection of the battery pack, and the partition structure is simple, easy to implement, low cost, and highly reliable. The provision of the partition has little effect on the internal structure of the battery pack, and for battery packs with liquid cooling channels integrated in the bottom plate, the provision of the partition will not affect the heat dissipation effect of the bottom plate on the battery module.

[0006] In one embodiment, along the arrangement direction of the partition and the bottom plate, the height of the partition is less than the height of the surrounding side frame. In the embodiment of the present application, the height of the partition is relatively small, and when the partition is connected to the bottom plate, it can be avoided that the partition is protruding from the surrounding side frame, which causes difficulty in installing the top plate. In the embodiment of the present application, the height of the partition is less than the height of the surrounding side frame, which facilitates the assembly of the battery pack.

[0007] In one embodiment, the height of the partition along the arrangement direction of the partition and the bottom plate is greater than the width of the partition along the arrangement direction of the partition and the battery module, and less than the length of the partition along the extension direction of the partition. In the embodiment of the present application, the height of the partition is greater than the width of the partition and less than the length of the partition, which is conducive to reducing the size of the partition. The partition is compactly arranged in the accommodating cavity, which improves the space utilization of the accommodating cavity, helps to save the space of the accommodating cavity and improve the energy density of the battery pack.

[0008] In one embodiment, the partition includes two connected first sub-plates, and along the arrangement direction of the partition and the bottom plate, one of the first sub-plates is arranged between the other first sub-plate and the bottom plate. Along the arrangement direction of the partition and the battery module, the width of the one first sub-plate is greater than the width of the other first sub-plate.

[0009] In the embodiment of the present application, the width of one first sub-plate is greater than the width of another first sub-plate, which increases the contact area between one first sub-plate and the bottom plate. This is beneficial for a first sub-plate to be stably fixed to the bottom plate, and is beneficial for improving the reliability of the seal between one first sub-plate and the bottom plate. On the other hand, the width of another first sub-plate is less than the width of one first sub-plate, and a larger gap is formed between the other first sub-plate and the adjacent battery module, which can be used to store more electrolyte. This reduces the risk of electrolyte overflowing into other compartments and improves the safety performance of the battery pack.

[0010] In one embodiment, the height of the first sub-plate along the arrangement direction of the partition and the bottom plate is less than or equal to the height of the other first sub-plate. In the embodiment of the present application, since the width of the other first sub-plate is less than the width of the first sub-plate, the height of the other first sub-plate is greater than or equal to the height of the first sub-plate, which is conducive to increasing the volume of the compartment, reducing the risk of electrolyte overflowing to other compartments, and improving the safety performance of the battery pack.

[0011] In one embodiment, the partition includes a second sub-plate and two third sub-plates, and along the extension direction of the partition, the second sub-plate is arranged between the two third sub-plates, and the two third sub-plates are used to be sealed and connected to the peripheral side frame. Along the arrangement direction of the partition and the battery module, the width of the third sub-plate is greater than the width of the second sub-plate.

[0012] In the embodiment of the present application, the width of the third sub-plate is greater than the width of the second sub-plate, which increases the contact area between the third sub-plate and the surrounding side frame. This is conducive to the stable fixation of the third sub-plate to the surrounding side frame, and is conducive to improving the reliability of the seal between the third sub-plate and the surrounding side frame. On the other hand, the width of the second sub-plate is less than the width of the third sub-plate, and a larger gap is formed between the second sub-plate and the adjacent battery module, which can be used to store more electrolyte. The risk of electrolyte overflowing into other compartments is reduced, and the safety performance of the battery pack is improved.

[0013] In one embodiment, the length of the third sub-plate along the extension direction of the partition is less than the length of the second sub-plate. In the embodiment of the present application, since the width of the second sub-plate is less than the width of the third sub-plate, the length of the second sub-plate is greater than the length of the third sub-plate, which is conducive to increasing the volume of the compartment, reducing the risk of electrolyte overflowing to other compartments, and improving the safety performance of the battery pack.

[0014] In one embodiment, the partition includes two end faces, and the two end faces are opposite to each other along the arrangement direction of the partition and the battery module. At least one of the end faces includes a plurality of spaced protrusion structures, and the protrusion structures protrude from one end face in a direction away from the other end face, and the width of the protrusion structure along the arrangement direction of the partition and the battery module is greater than or equal to the spacing between the two end faces.

[0015] In the embodiment of the present application, the protruding structure extends toward two adjacent battery modules, and the protruding structure can play a role in supporting the partition to prevent the partition from tilting, bending and getting close to the adjacent battery modules. The protruding structure can ensure that the end face of the partition is spaced from the adjacent battery modules, and the electrolyte leaked from the battery module can be better confined in the compartment where the battery module is located, reducing the risk of the electrolyte flowing to other compartments and improving the safety performance of the battery pack.

[0016] In one embodiment, along the extension direction of the protrusion structure, the protrusion structure includes two ends, one end of the protrusion structure is used to be fixed to an end surface of the partition, and along the arrangement direction of the partition and the bottom plate, the distance between one end of the protrusion structure and the bottom plate is greater than or equal to the distance between the other end of the protrusion structure and the bottom plate.

[0017] In the embodiment of the present application, the protrusion structure is inclined toward the bottom plate, and the electrolyte leaking to the partition can flow toward the bottom plate along the protrusion structure. The protrusion structure also guides the electrolyte away from the partition, reducing the risk of the electrolyte flowing to other compartments and improving the safety performance of the battery pack.

[0018] In one embodiment, the maximum length of the partition is greater than or equal to the length of the peripheral side frame along the direction in which the partition extends. When the partition is a straight plate, the maximum length of the partition is the length of the partition along the first direction. The maximum length of the partition is equal to or approximately equal to the length of the peripheral side frame along the direction in which the partition extends. The straight partition has a simple structure and is easy to arrange. When the partition is a curved plate, the maximum length of the partition is the length of the partition after being straightened. The maximum length of the partition is greater than the length of the partition along the first direction. The curved partition has a larger contact area with the bottom plate, which is conducive to the stable fixation of the partition to the bottom plate.

[0019] In one embodiment, the partition includes a plurality of first arc segments and a plurality of second arc segments, the plurality of first arc segments and the plurality of second arc segments are alternately arranged along the extension direction of the partition, and the opening directions of the first arc segments and the second arc segments are opposite to the arrangement direction of the battery modules along the partition. Each of the battery modules includes a plurality of cylindrical cells, the cylindrical cell portion of one of the two adjacent battery modules is accommodated in the plurality of first arc segments, and the cylindrical cell portion of the other of the two adjacent battery modules is accommodated in the plurality of second arc segments.

[0020] In an embodiment of the present application, a plurality of battery cells of a battery module are arranged in sequence along the extension direction of the partition. The battery cells are cylindrical, and the battery modules are curved on both sides along the arrangement direction of the battery modules and the partition. The partition is also curved. Each arc segment accommodates part of a battery cell of an adjacent battery module or accommodates part of more than one battery cell of an adjacent battery module. A plurality of second arc segments accommodate part of a battery cell of another adjacent battery module or accommodate part of more than one battery cell of another adjacent battery module. In the embodiment of the present application, full use is made of the gaps between the battery cells, which is beneficial to reducing the size of the battery pack along the arrangement direction of the battery module and the partition.

[0021] In one embodiment, the battery pack further includes a first sealing structure and two second sealing structures, wherein the first sealing structure is located between the partition and the bottom plate. The first sealing structure is used to seal the partition and the bottom plate. The peripheral side frame includes two first side plates arranged relatively to each other along the extension direction of the partition, wherein one second sealing structure is located between one end of the partition and one of the first side plates, and the other second sealing structure is located between the other end of the partition and the other first side plate. The one second sealing structure is used to seal one end of the partition and the one first side plate, and the other second sealing structure is used to seal the other end of the partition and the other first side plate.

[0022] In the embodiment of the present application, the first sealing structure fills the gap between the partition and the bottom plate so that the partition and the bottom plate are sealed and connected. The second sealing structure fills the gap between the partition and the surrounding side frame so that the partition and the surrounding side frame are sealed and connected. The provision of the first sealing structure and the second sealing structure can improve the reliability of the sealing between the partition and the bottom plate and the surrounding side frame, so that the partition can effectively block the flow of electrolyte.

[0023] In one embodiment, the battery pack includes a plurality of battery modules, the plurality of battery modules are arranged at intervals along the arrangement direction of the battery modules and the partitions, each of the battery modules includes a plurality of battery cells, and the plurality of battery cells are arranged in sequence along the extension direction of the partitions. Along the arrangement direction of the battery modules and the partitions, each of the partitions is spaced apart from the two adjacent battery modules, and along the arrangement direction of the battery modules and the partitions, the width of the partition is less than the spacing between the two adjacent battery modules.

[0024] In the embodiment of the present application, multiple battery modules in the battery pack are arranged in an orderly manner, which simplifies the assembly of the battery pack. The gap between the partition and the adjacent battery module can be used to store leaked electrolyte, which increases the volume of the compartment and reduces the risk of electrolyte overflowing into other compartments. In addition, when the battery module leaks electrolyte from a position higher than the partition, since the partition is spaced apart from the adjacent battery module, the leaked electrolyte can smoothly flow from the side wall of the battery module to the bottom plate, reducing the risk of electrolyte flowing directly from the gap between the partition and the top plate to the adjacent compartment. The isolation between compartments is improved, which helps to ensure reliable insulation between battery modules in different compartments, thereby reducing safety risks such as fire and explosion of the battery pack.

[0025] In one embodiment, the spacing between the partition and the two adjacent battery modules along the arrangement direction of the battery module and the partition is greater than 1 mm and less than 5 mm. In the embodiment of the present application, the spacing between the partition and any adjacent battery module is within an appropriate range, which is conducive to limiting the electrolyte leaked from the battery module to the compartment where the battery module is located, thereby improving the safety performance of the battery pack. In addition, the battery module and the partition are compactly arranged, which helps to improve the energy density of the battery pack.

[0026] In one embodiment, the height of the partition along the arrangement direction of the partition and the bottom plate is greater than or equal to 5 mm, so that the compartment can store a certain amount of electrolyte to prevent the electrolyte from overflowing and spreading to other compartments. The partition can effectively block the flow of electrolyte.

[0027] In one embodiment, the height of the partition along the arrangement direction of the partition and the bottom plate is less than or equal to the height of the battery module, thereby reducing the influence of the partition on the electrical connection between adjacent battery modules.

[0028] In one embodiment, the peripheral side frame further comprises two second side plates arranged opposite to each other along the arrangement direction of the partition and the battery module. The at least one partition is spaced apart from the two second side plates, and the gap between the at least one partition and each of the second side plates is used to accommodate at least one battery module. In the embodiment of the present application, the two second side plates are used to enclose and form the cabin, which reduces the number of partitions and helps to reduce costs.

[0029] In one embodiment, the at least one partition is a plurality of partitions, and the plurality of partitions are arranged in sequence at intervals, and the gap between any two adjacent partitions is used to accommodate at least one battery module. In the embodiment of the present application, the gap between any two adjacent partitions is used to arrange the battery modules, which improves the utilization rate of the partitions and helps to reduce the size of the battery pack.

[0030] In a second aspect, the present application provides an energy storage system, which includes a power conversion module and multiple battery packs as described above, wherein the power converter is connected to the multiple battery packs and is used to perform power conversion on the current input into or output from the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0032] Figure 1 A schematic diagram of an energy storage system provided in accordance with one embodiment of the present application.

[0033] Figure 2 A three-dimensional diagram of a battery pack provided according to an embodiment of the present application.

[0034] Figure 3 A top view of a battery pack provided in accordance with an embodiment of the present application.

[0035] Figure 4 A cross-sectional view of a battery pack along the YZ plane provided in one embodiment of the present application.

[0036] Figure 5 A cross-sectional view of a battery pack along the YZ plane provided in one embodiment of the present application.

[0037] Figure 6 A three-dimensional diagram of a partition provided in accordance with an embodiment of the present application.

[0038] Figure 7 A three-dimensional diagram of a partition provided in accordance with an embodiment of the present application.

[0039] Figure 8 A top view of a battery pack provided in accordance with an embodiment of the present application.

[0040] Fig. 9A three-dimensional diagram of a partition provided in accordance with an embodiment of the present application.

[0041] Fig.10 A three-dimensional diagram of a partition provided in accordance with an embodiment of the present application.

[0042] Fig.11 A cross-sectional view of a battery pack along the YZ plane provided in one embodiment of the present application.

[0043] Fig.12 A three-dimensional diagram of a partition provided in accordance with an embodiment of the present application.

[0044] Fig.13 A top view of a battery pack provided in accordance with an embodiment of the present application.

[0045] Fig.14 A cross-sectional view of a battery pack along the XZ plane provided in one embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0047] In this document, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0048] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the structure.

[0049] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0050] Parallelism: The parallelism defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for situations where the absolute parallelism is not achieved due to factors such as assembly tolerance, design tolerance, and the influence of structural flatness.

[0051] Vertical: The verticality defined in the embodiments of the present application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for a relationship that is not absolutely vertical due to factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0052] See also Figure 1 , Figure 1 A schematic diagram of an energy storage system provided in one embodiment of the present application. The energy storage system includes a power conversion module 20 and a plurality of battery packs 10 , and the power conversion module 20 is connected to the plurality of battery packs 10 .

[0053] The battery pack 10 is used to store electrical energy and supply power to the load 2. The power conversion module 20 is a module capable of realizing a power conversion function. The power conversion module 20 can realize at least one function of DC-DC conversion, AC-AC conversion, AC-DC conversion, and DC-AC conversion. Exemplarily, the power conversion module 20 can be a converter or other power conversion device. The converter includes a rectifier (AC-DC), an inverter (DC-AC), an AC converter (AC-AC), and a DC converter (DC-DC).

[0054] In one embodiment, the energy storage system further includes an energy storage cabinet 1 . The power conversion module 20 and a plurality of battery packs 10 are accommodated in the energy storage cabinet 1 .

[0055] The power conversion module 20 is used to perform power conversion on the current output by the battery pack 10 and then transmit it to the load 2. The load 2 can be any electrical equipment that uses the energy storage system as a power source, such as a vehicle, a communication base station, a household and industrial energy storage device. Exemplarily, the power conversion module 20 can realize AC-DC conversion. The direct current output by the battery pack 10 is converted into alternating current by the power conversion module 20 and then used for electricity in daily life and production. Or the power conversion module 20 can realize AC-AC conversion and AC-DC conversion. The direct current output by the battery pack 10 is converted into AC-AC and AC-DC in sequence and then used for electricity in daily life and production.

[0056] The power conversion module 20 can also be used to receive the current transmitted by the power supply 3, and convert the current transmitted by the power supply 3 into power before transmitting it to the battery pack 10. The power supply 3 can be a city power supply, a generator, solar energy, wind energy, a battery, etc.

[0057] In one embodiment, the power supply 3 is a power grid 31 (such as Figure 1As shown in FIG. 1 , the power conversion module 20 is connected to the power grid 31 and the battery pack 10. The power conversion module 20 converts the AC power provided by the power grid 31 into DC power and then charges the battery pack 10. The DC power output by the battery pack 10 can also be converted into AC power by the power conversion module 20 and then fed back into the power grid 31.

[0058] In one embodiment, the power source 3 is a photovoltaic panel 32 (such as Figure 1 ). The photovoltaic panel 32 converts solar energy into electric energy, and charges the battery pack 10 after power conversion through the power conversion module 20. In one embodiment, when the electric energy output by the photovoltaic panel 32 exceeds the demand of the power grid 31 or the demand of the load 2 for electric energy, the excess electric energy generated by the photovoltaic panel 32 can be stored in the battery pack 10 through the power conversion module 20. When the electric energy output by the photovoltaic panel 32 is less than the demand of the power grid 31 or the demand of the load 2 for electric energy, the battery pack 10 feeds the stored electric energy into the power grid 31 or supplies power to the load 2 through the power conversion module 20.

[0059] The battery pack 10 provided in the present application can also be applied to other energy storage systems other than the energy storage system described above. For example, the battery pack 10 can be applied to a vehicle-mounted energy storage system. The DC power output by the vehicle-mounted battery pack 10 is converted by the power conversion module 20 and then supplied to the corresponding vehicle-mounted load 2.

[0060] There is a risk of electrolyte leakage during transportation or operation of the battery pack 10. The leaked electrolyte flows in the shell of the battery pack 10 and corrodes the insulating film of the battery module 300 in the battery pack 10 (see reference 1). Figure 2 ), thereby causing insulation failure between multiple battery modules 300. Insulation failure between battery modules 300 may cause the risk of fire or even explosion of the battery pack 10. The battery pack 10 provided in the present application includes a partition 100, which can limit the flow of leaked electrolyte in the shell, thereby improving the safety performance of the battery pack 10.

[0061] The battery pack 10 in the present application is described in detail below.

[0062] See also Figure 2 , Figure 3 and Figure 4 . Figure 2 A three-dimensional diagram of a battery pack 10 provided according to an embodiment of the present application. Figure 3 A top view of a battery pack 10 provided in accordance with an embodiment of the present application. Figure 4A cross-sectional view of a battery pack 10 provided along the YZ plane according to an embodiment of the present application. The present application provides a battery pack 10, which includes a shell and at least one partition 100. The shell includes a bottom plate 210 and a surrounding side frame 220, the bottom plate 210 is connected to the surrounding side frame 220 to form a receiving cavity, the receiving cavity is used to receive a plurality of battery modules 300, and the bottom plate 210 is used to fix the plurality of battery modules 300. At least one partition 100 is received in the receiving cavity, each partition 100 is arranged between two adjacent battery modules 300, each partition 100 is sealedly connected to the bottom plate 210, and both ends of each partition 100 are sealedly connected to the surrounding side frame 220.

[0063] The side frame 220 includes two openings. The housing further includes a top plate. The top plate and the bottom plate 210 are arranged opposite to each other along the third direction Z. The top plate and the bottom plate 210 are respectively used to close the two openings of the side frame 220. The top plate, the bottom plate 210 and the side frame 220 are jointly arranged to form a receiving cavity.

[0064] In one embodiment, the bottom plate 210 is further integrated with a liquid cooling channel. The cooling liquid in the liquid cooling channel is used to perform heat exchange with the multiple battery modules 300 to cool the multiple battery modules 300.

[0065] At least one partition 100 is used to separate a plurality of battery modules 300. A plurality of compartments are formed between two adjacent partitions 100 and the bottom plate 210, and between the partition 100, the side wall of the peripheral side frame 220 and the bottom plate.

[0066] Exemplarily, in one embodiment, the battery pack 10 includes a partition 100. A partition 100 separates the accommodating cavity into two compartments, each compartment containing at least one battery module 300. Exemplarily, the battery pack 10 includes three battery modules 300, wherein two battery modules 300 are contained in one compartment, and another battery module 300 is contained in another compartment. The three battery modules 300 are separated by the partition 100 to form two parts.

[0067] In one embodiment, the battery pack 10 includes two or more partitions 100, and the two or more partitions 100 separate the receiving cavity into a plurality of compartments, each compartment accommodating at least one battery module 300. Figure 3 In the illustrated embodiment, two partitions 100 separate the receiving cavity into three compartments. Each compartment accommodates a battery module 300. The three battery modules 300 are separated into three parts by two partitions 100.

[0068] In the embodiment of the present application, since the partition 100 is sealed and connected to the bottom plate 210 and the surrounding side frame 220, the electrolyte leaked from the battery module 300 is confined to the compartment where the battery module 300 is located. The provision of the partition 100 blocks the electrolyte from flowing to other compartments. The flow range of the electrolyte is reduced, the mutual influence of leakage between different compartments is reduced, and the insulation reliability between the battery modules 300 in different compartments is improved, thereby improving the safety performance of the battery pack 10. In addition, the partition 100 is used to implement leakage protection of the battery pack 10. The partition 100 has a simple structure, is easy to implement, has a low cost, and has high reliability. The provision of the partition 100 has little effect on the internal structure of the battery pack 10, and for the battery pack 10 in which the bottom plate 210 is integrated with a liquid cooling channel, the provision of the partition 100 will not affect the heat dissipation effect of the bottom plate 210 on the battery module.

[0069] In one embodiment, the number of separators 100 can be designed according to the voltage resistance of the battery cells in the battery module 300 and the voltage of a single battery cell, so that the total voltage of the battery module 300 in each compartment is less than the maximum voltage resistance of the battery cell. This ensures that the maximum voltage in each compartment is within a safe range, reducing the risk of insulation failure between battery modules 300 and between the battery module 300 and the housing.

[0070] In one embodiment, the separator 100 is made of a material resistant to electrolyte corrosion. Exemplarily, the material resistant to electrolyte corrosion includes PP (polypropylene) and PE (polyethylene).

[0071] See also Figure 2 and Figure 3 In one embodiment, the peripheral side frame 220 includes two first side plates 221 arranged opposite to each other along the extension direction of the partition 100, and the two ends of the partition 100 are respectively sealed and connected to the two first side plates 221. The two first side plates 221 are arranged at intervals along the first direction X. The two ends of each partition 100 along the first direction X are respectively sealed and connected to the two first side plates 221. The regularity of the arrangement of the multiple partitions 100 is improved, and the partition 100 is conveniently sealed and connected to the peripheral side frame 220.

[0072] See also Figure 2 and Figure 3In one embodiment, the peripheral side frame 220 further includes two second side plates 222. The two second side plates 222 are arranged opposite to each other along the arrangement direction of the partition 100 and the battery module 300. The arrangement direction of the partition 100 and the battery module 300 is parallel to the second direction Y. Along the second direction Y, the at least one partition 100 is spaced from the two second side plates 222, and the gap between the at least one partition 100 and each second side plate 222 is used to accommodate at least one battery module 300. Among them, one second side plate 222, the at least one partition 100 and another second side plate 222 are arranged in sequence. In the embodiment of the present application, the gap between the partition 100 and the second side plate 222 is fully utilized to arrange the battery module 300, which is beneficial to improve the energy density of the battery pack 10. And the battery module 300 arranged between the partition 100 and the second side plate 222 can also be better isolated from other battery modules 300, which is beneficial to improve the safety performance of the battery pack 10.

[0073] In one embodiment, the battery pack 10 includes a partition 100, and a partition 100 and two second side plates 222 are arranged at intervals along the second direction Y. The gap formed by a partition 100 and each second side plate 222 is used to accommodate at least one battery module 300. Among them, a second side plate 222, a partition 100 and a bottom plate 210 can be enclosed to form a compartment. Another second side plate 222, a partition 100 and a bottom plate 210 can be enclosed to form another compartment. The electrolyte leaked from the battery module 300 is isolated in the compartment where the battery module 300 is located. In the embodiment of the present application, two second side plates 222 are used to enclose and form a compartment, which reduces the number of partitions 100 and helps reduce costs.

[0074] See also Figure 2 and Figure 3 In one embodiment, the battery pack 10 includes a plurality of partitions 100, and the plurality of partitions 100 are arranged in sequence at intervals, and the gap between any two adjacent partitions 100 is used to accommodate at least one battery module 300. Among them, the plurality of partitions 100 are arranged along the second direction Y. A second side plate 222, adjacent partitions 100 and the bottom plate 210 can be enclosed to form a compartment, and two adjacent partitions 100 and the bottom plate can be enclosed to form a compartment. Another second side plate 222, adjacent partitions 100 and the bottom plate 210 can also be enclosed to form a compartment. In the embodiment of the present application, any two adjacent partitions 100 are used to arrange the battery modules 300, which improves the utilization rate of the partitions 100 and helps to reduce the size of the battery pack 10.

[0075] See also Figure 2 and Figure 3In one embodiment, the battery pack 10 includes a plurality of battery modules 300, and the plurality of battery modules 300 are arranged at intervals along the second direction Y. Each battery module 300 includes a plurality of battery cells, and the plurality of battery cells are arranged in sequence along the first direction X. Among them, the partition 100 is arranged between two adjacent battery modules 300 along the second direction Y. The second direction Y is parallel to the arrangement direction of the battery modules 300 and the partition 100, and the battery modules 300 and the partition 100 are arranged at intervals. The first direction X is perpendicular to the second direction Y. In the embodiment of the present application, the plurality of battery modules 300 in the battery pack 10 are arranged in a regular pattern, and the partition 100 extends along the first direction X to separate the plurality of battery modules 300, thereby simplifying the assembly of the battery pack 10.

[0076] See also Figure 2 and Figure 3 In one embodiment, each partition 100 is spaced apart from two adjacent battery modules 300 along the arrangement direction of the battery modules 300 and the partition 100, and the width of the partition 100 along the arrangement direction of the battery modules 300 and the partition 100 is less than the spacing between two adjacent battery modules 300. The arrangement direction of the battery modules 300 and the partition 100 is parallel to the second direction Y. Each partition 100 is spaced apart from two adjacent battery modules 300. On the one hand, the gap between the partition 100 and the adjacent battery modules 300 can be used to store leaked electrolyte, which increases the volume of the compartment and reduces the risk of electrolyte overflowing into other compartments. On the other hand, when the battery module 300 leaks electrolyte from a position higher than the partition 100, the leaked electrolyte can smoothly flow from the side wall of the battery module 300 to the bottom plate 210 because the partition 100 is spaced apart from the adjacent battery module 300, reducing the risk of the electrolyte flowing directly from the gap between the partition 100 and the top plate to the adjacent compartment. The isolation between compartments is improved, which helps to ensure reliable insulation between battery modules 300 in different compartments, thereby reducing safety risks such as fire and explosion of the battery pack 10.

[0077] In one embodiment, the spacing between the partition 100 and two adjacent battery modules 300 along the arrangement direction of the battery module 300 and the partition 100 is greater than 1 mm and less than 5 mm. In the embodiment of the present application, the spacing between the partition 100 and any adjacent battery module 300 along the second direction Y is within an appropriate range, which is conducive to limiting the electrolyte leaked from the battery module 300 to the compartment where the battery module 300 is located, thereby improving the safety performance of the battery pack 10. In addition, the battery module 300 and the partition 100 are compactly arranged, which helps to improve the energy density of the battery pack 10.

[0078] In one embodiment, the interval between the partition 100 and two adjacent battery modules 300 along the arrangement direction of the battery modules 300 and the partition 100 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0079] See also Figure 4 In one embodiment, the height of the partition 100 along the arrangement direction of the partition 100 and the bottom plate 210 is less than the height of the surrounding side frame 220. Among them, the arrangement direction of the partition 100 and the bottom plate 210 is parallel to the third direction Z. In the embodiment of the present application, the height of the partition 100 along the third direction Z is relatively small. When the partition 100 is connected to the bottom plate 210, it can be avoided that the partition 100 is protruding from the surrounding side frame 220 and causing difficulties in installing the top plate. In the embodiment of the present application, the height of the partition 100 is less than the height of the surrounding side frame 220, which facilitates the assembly of the battery pack 10.

[0080] See also Figure 4 In one embodiment, the height of the partition 100 along the arrangement direction of the partition 100 and the bottom plate 210 is less than or equal to the height of the battery module 300. The height of the partition 100 is small, which reduces the influence of the partition 100 on the electrical connection between adjacent battery modules 300. In one embodiment, a busbar is provided between the top plate and the plurality of battery modules 300, and the plurality of battery modules 300 are connected in series or in parallel through the busbar. The height of the partition 100 is less than or equal to the height of the battery module 300, and the plurality of battery modules 300 can be smoothly connected to the busbar.

[0081] In one embodiment, the height of the partition 100 along the arrangement direction of the partition 100 and the bottom plate 210 is greater than or equal to 5 mm. In the embodiment of the present application, the height of the partition 100 along the third direction Z affects the amount of electrolyte stored in the compartment. In the embodiment of the present application, the height of the partition 100 is greater than or equal to 5 mm, so that the compartment can store a certain amount of electrolyte, avoiding electrolyte overflow and diffusion to other compartments. The partition 100 can effectively block the flow of electrolyte.

[0082] See also Figure 3 In one embodiment, the length of the partition 100 along the extension direction of the partition 100 is less than or equal to the length of the peripheral side frame 220. The length of the partition 100 refers to the straight line length between the two ends of the partition 100 along the first direction X. The length of the peripheral side frame 220 is the distance between the two first side plates 221 of the peripheral side frame 220 along the first direction X. The length of the partition 100 is less than or equal to the length of the peripheral side frame 220 so that the partition 100 can be accommodated in the accommodating cavity.

[0083] See also Figure 3 and Figure 4In one embodiment, the height of the partition 100 along the arrangement direction of the partition 100 and the bottom plate 210 is greater than the width of the partition 100 along the arrangement direction of the partition 100 and the battery module 300, and is less than the length of the partition 100 along the extension direction of the partition 100. In the embodiment of the present application, the height of the partition 100 along the third direction Z is greater than the width of the partition 100 along the second direction Y, and is less than the length of the partition 100 along the first direction X, which is conducive to reducing the size of the partition 100. The partition 100 is compactly arranged in the accommodating cavity, which improves the space utilization of the accommodating cavity, helps to save the space of the accommodating cavity, and improves the energy density of the battery pack 10.

[0084] In one embodiment, the width of the side of the partition 100 close to the bottom plate 210 along the arrangement direction of the partition 100 and the bottom plate 210 is greater than the width of the other side of the partition 100 away from the bottom plate 210 along the arrangement direction of the partition 100 and the bottom plate 210. The width of one side of the partition 100 refers to the width of one side of the partition 100 along the second direction Y. The width of the other side of the partition 100 refers to the width of the other side of the partition 100 along the second direction Y. In the embodiment of the present application, the width of the side of the partition 100 close to the bottom plate 210 is larger, which increases the contact area between the partition 100 and the bottom plate 210. It is beneficial to stably fix the partition 100 to the bottom plate 210, and it is beneficial to improve the reliability of the seal between the partition 100 and the bottom plate 210.

[0085] In one embodiment, the width of the partition 100 gradually increases from the direction from the partition 100 to the bottom plate 210. The width of the partition 100 refers to the width of the partition 100 along the second direction Y. Exemplarily, the cross-section of the partition 100 along the YZ plane is trapezoidal, and the two bases of the trapezoid are arranged along the arrangement direction of the partition 100 and the bottom plate 210. The longer of the two bases is fixed to the bottom plate 210, and the shorter of the two bases is arranged away from the bottom plate 210. In one embodiment, the cross-section of the partition 100 along the YZ plane is triangular, the base of the triangle is fixed to the bottom plate 210, and the fixed point of the triangle is arranged away from the bottom plate 210.

[0086] In the embodiment of the present application, the width of the side of the partition 100 close to the bottom plate 210 is larger, which increases the contact area between the partition 100 and the bottom plate 210. This is conducive to stably fixing the partition 100 to the bottom plate 210 and improving the reliability of the seal between the partition 100 and the bottom plate 210.

[0087] See also Figure 5 and Figure 6 , Figure 5 A cross-sectional view of a battery pack 10 along the YZ plane provided in one embodiment of the present application. Figure 6A three-dimensional diagram of a partition 100 provided in one embodiment of the present application. In one embodiment, the partition 100 includes two connected first sub-plates 110, and along the arrangement direction of the partition 100 and the bottom plate 210, one first sub-plate 110 is arranged between the other first sub-plate 110 and the bottom plate 210. Along the arrangement direction of the partition 100 and the battery module 300, the width of the one first sub-plate 110 is greater than the width of the other first sub-plate 110.

[0088] For the convenience of description, one first sub-board 110 is defined as a first sub-board 110a, and another first sub-board 110b is defined as a first sub-board 110b. Along the third direction Z, the first sub-board 110b, the first sub-board 110a and the bottom board 210 are arranged in sequence.

[0089] In the embodiment of the present application, the width of the first sub-plate 110a along the second direction Y is greater than the width of the first sub-plate 110b along the second direction Y, which increases the contact area between the first sub-plate 110a and the bottom plate 210. This is conducive to the stable fixation of the first sub-plate 110a to the bottom plate 210, and is conducive to improving the reliability of the seal between the first sub-plate 110a and the bottom plate 210. On the other hand, the width of the first sub-plate 110b is less than the width of the first sub-plate 110a, and a larger gap is formed between the first sub-plate 110b and the adjacent battery module 300, which can be used to store more electrolyte. The risk of electrolyte overflowing into other compartments is reduced, and the safety performance of the battery pack 10 is improved.

[0090] See also Figure 6 In one embodiment, the spacing between the other first sub-plate 110 and the first sub-plate 110 on both sides along the second direction Y is equal. Exemplarily, the two first sub-plates 110 are in an inverted T shape. The symmetrical design of the partition 100 improves the stability of the connection between the partition 100 and the bottom plate 210 and reduces the difficulty of processing the partition 100.

[0091] See also Figure 7 In one embodiment, a first sub-plate 110 includes two sides arranged opposite to each other along the second direction Y, and the spacing between the two sides of another first sub-plate 110 and the first sub-plate 110 along the second direction Y is not equal. Exemplarily, the two first sub-plates 110 are L-shaped. The shape of the partition 100 can be adjusted according to the specific conditions in the battery pack 10 to increase the adaptability of the partition 100.

[0092] In one embodiment, the two first sub-boards 110 are an integrated structure. The two first sub-boards 110 are integrally formed, which improves the connection strength of the two first sub-boards 110.

[0093] In one embodiment, the width of a first sub-plate 110 along the second direction Y is smaller than the gap between two adjacent battery modules 300. The first sub-plate 110a and the first sub-plate 110b are both spaced apart from the adjacent battery modules 300, which is beneficial to increase the volume of the compartment, reduce the risk of electrolyte overflowing to other compartments, and improve the safety performance of the battery pack 10.

[0094] In one embodiment, the width of a first sub-plate 110 along the second direction Y is equal to the gap between two adjacent battery modules 300. The two ends of the first sub-plate 110a along the second direction Y are respectively in contact with two adjacent battery modules 300. When assembling the battery pack 10, the first sub-plate 110a can be used to position the battery module 300, so as to facilitate the installation and arrangement of the battery module 300 and the partition 100 in the battery pack 10. In addition, the first sub-plate 110b is spaced apart from the two adjacent battery modules 300, and the gap between the first sub-plate 110b and the two adjacent battery modules 300 can be used to store leaked electrolyte.

[0095] In one embodiment, the height of one first sub-plate 110 along the arrangement direction of the partition 100 and the bottom plate 210 is less than or equal to the height of another first sub-plate 110. Among them, one first sub-plate 110 refers to the first sub-plate 110a, and the other first sub-plate 110 refers to the first sub-plate 110b. In the embodiment of the present application, since the width of the first sub-plate 110b is less than the width of the first sub-plate 110a, the height of the first sub-plate 110b along the third direction Z is greater than or equal to the height of the first sub-plate 110a along the third direction Z, which is conducive to increasing the volume of the compartment, reducing the risk of electrolyte overflowing to other compartments, and improving the safety performance of the battery pack 10.

[0096] See also Figure 8 and Fig. 9 , Figure 8 A top view of a battery pack 10 provided in accordance with an embodiment of the present application. Fig. 9 A three-dimensional diagram of a partition 100 provided in one embodiment of the present application. In one embodiment, the partition 100 includes a second sub-plate 120 and two third sub-plates 130. The second sub-plate 120 is arranged between the two third sub-plates 130 along the extension direction of the partition 100, and the two third sub-plates 130 are used to be sealed and connected with the surrounding side frame 220. The width of the third sub-plate 130 along the arrangement direction of the partition 100 and the battery module 300 is greater than the width of the second sub-plate 120. Among them, the two third sub-plates 130 are sealed and connected with the two first side plates 221 of the surrounding side frame 220 respectively.

[0097] In the embodiment of the present application, the width of the third sub-plate 130 along the second direction Y is greater than the width of the second sub-plate 120 along the second direction Y, which increases the contact area between the third sub-plate 130 and the surrounding side frame 220. This is conducive to the stable fixation of the third sub-plate 130 to the surrounding side frame 220, and is conducive to improving the reliability of the seal between the third sub-plate 130 and the surrounding side frame 220. On the other hand, the width of the second sub-plate 120 is less than the width of the third sub-plate 130, and a larger gap is formed between the second sub-plate 120 and the adjacent battery module 300, which can be used to store more electrolyte. The risk of electrolyte overflowing into other compartments is reduced, and the safety performance of the battery pack 10 is improved.

[0098] In one embodiment, the length of the third sub-plate 130 along the extension direction of the partition 100 is less than the length of the second sub-plate 120. In the embodiment of the present application, since the width of the second sub-plate 120 is less than the width of the third sub-plate 130, the length of the second sub-plate 120 along the first direction X is greater than the length of the third sub-plate 130 along the first direction X, which is conducive to increasing the volume of the compartment, reducing the risk of electrolyte overflowing to other compartments, and improving the safety performance of the battery pack 10.

[0099] See also Fig.10 , Fig.10 A three-dimensional diagram of a partition 100 provided in an embodiment of the present application. In one embodiment, the partition 100 includes a second sub-plate 120 and two third sub-plates 130, and the second sub-plate 120 is arranged between the two third sub-plates 130 along the extension direction of the partition 100. The second sub-plate 120 includes two connected first sub-plates 110, and along the arrangement direction of the partition 100 and the bottom plate 210, one first sub-plate 110 is arranged between the other first sub-plate 110 and the bottom plate 210. Among them, the two third sub-plates 130 are used for sealing connection with the peripheral side frame 220. The one first sub-plate 110 is used for sealing connection with the bottom plate 210. Along the arrangement direction of the partition 100 and the battery module 300, the width of the third sub-plate 130 is greater than the width of the second sub-plate 120, and the width of the one first sub-plate 110 is greater than the width of the other first sub-plate 110.

[0100] In the embodiment of the present application, the width of the third sub-plate 130 along the second direction Y is relatively large, which increases the contact area between the third sub-plate 130 and the surrounding side frame 220. This is conducive to the stable fixing of the third sub-plate 130 to the surrounding side frame 220, and is conducive to improving the reliability of the seal between the third sub-plate 130 and the surrounding side frame 220. On the other hand, the width of the first sub-plate 110a along the second direction Y is relatively large, which increases the contact area between the first sub-plate 110a and the bottom plate 210. This is conducive to the stable fixing of the first sub-plate 110a to the bottom plate 210, and is conducive to improving the reliability of the seal between the first sub-plate 110a and the bottom plate 210.

[0101] See also Fig.11 and Fig.12 . Fig.11 A cross-sectional view of a battery pack 10 along the YZ plane provided in one embodiment of the present application. Fig.12 A three-dimensional diagram of a partition 100 provided in one embodiment of the present application. In one embodiment, the partition 100 includes two end faces, and the two end faces are opposite to each other along the arrangement direction of the partition 100 and the battery module 300. At least one end face includes a plurality of spaced protrusion structures 101, and the protrusion structure 101 protrudes from one end face in a direction away from the other end face, and the width of the protrusion structure 101 along the arrangement direction of the partition 100 and the battery module 300 is greater than or equal to the distance between the two end faces. Among them, the distance between the two end faces is the width along the second direction Y when the partition 100 does not include the protrusion structure 101. The plurality of protrusion structures 101 are spaced apart, and the electrolyte leaked from the battery module can flow toward the bottom plate 210 through the gaps between the plurality of protrusion structures 101.

[0102] In the embodiment of the present application, the protruding structure 101 extends toward two adjacent battery modules 300, and the protruding structure 101 can play a role in supporting the partition 100, preventing the partition 100 from tilting, bending, and approaching the adjacent battery module 300. The protruding structure 101 can ensure that the end surface of the partition 100 is spaced from the adjacent battery module 300, and the electrolyte leaked from the battery module 300 can be better confined in the compartment where the battery module 300 is located, reducing the risk of the electrolyte flowing to other compartments, and improving the safety performance of the battery pack 10.

[0103] In one embodiment, the plurality of protrusion structures 101 are arranged along the first direction X at intervals.

[0104] In one embodiment, both end surfaces of the separator 100 include a plurality of spaced protrusion structures 101, one end of the protrusion structure 101 is fixed to one end surface of the separator 100, and the other end of the protrusion structure 101 abuts against the adjacent battery module 300. The protrusion structure 101 can improve the stability of the separator 100.

[0105] In one embodiment, the material of the protruding structure 101 may be insulating soft glue to prevent the protruding structure 101 from scratching the battery module 300 .

[0106] In one embodiment, the protruding structure 101 includes two ends along the extension direction of the protruding structure 101, one end of the protruding structure 101 is used to be fixed to an end surface of the partition 100, and the distance between one end of the protruding structure 101 and the bottom plate 210 along the arrangement direction of the partition 100 and the bottom plate 210 is greater than or equal to the distance between the other end of the protruding structure 101 and the bottom plate 210. The protruding structure 101 is inclined toward the bottom plate 210, and the electrolyte leaked to the partition 100 can flow to the bottom plate 210 along the protruding structure 101. In addition, the protruding structure 101 guides the electrolyte in the direction away from the partition 100, reducing the risk of the electrolyte flowing to other compartments and improving the safety performance of the battery pack 10.

[0107] See also Fig.13 , Fig.13 A top view of a battery pack 10 provided in one embodiment of the present application. In one embodiment, the maximum length of the partition 100 is greater than or equal to the length of the peripheral side frame 220 along the direction in which the partition 100 extends. Among them, the maximum length of the partition 100 refers to the length of the partition 100 itself. Among them, the partition 100 can be a straight plate or a curved plate. When the partition 100 is a straight plate, the maximum length of the partition 100 is the length of the partition along the first direction X. The maximum length of the partition 100 is equal to or approximately equal to the length of the peripheral side frame 220 along the direction in which the partition 100 extends. The straight partition 100 has a simple structure and is easy to arrange. When the partition 100 is a curved plate or a folded plate, the maximum length of the partition 100 is the length of the partition 100 after straightening. The maximum length of the partition 100 is greater than the length of the partition 100 along the first direction X. The curved partition 100 has a large contact area with the bottom plate 210, which is conducive to the stable fixation of the partition 100 to the bottom plate 210.

[0108] In one embodiment, the partition 100 includes a plurality of first arc segments 141 and a plurality of second arc segments 142, which are alternately arranged along the extension direction of the partition 100, and the opening directions of the first arc segments 141 and the second arc segments 142 are opposite to the arrangement direction of the battery modules 300 along the partition 100. Part of one of the two adjacent battery modules 300 is accommodated in the plurality of first arc segments 141, and part of the other of the two adjacent battery modules 300 is accommodated in the plurality of second arc segments 142.

[0109] The two adjacent battery modules 300 are two battery modules 300 adjacent to the separator 100 . The separator 100 is arranged between the two adjacent battery modules 300 .

[0110] In one embodiment, each battery module 300 includes a plurality of cylindrical cells. The cylindrical cell portion of one of the two adjacent battery modules 300 is accommodated in a plurality of first arc segments 141, and the cylindrical cell portion of the other of the two adjacent battery modules 300 is accommodated in a plurality of second arc segments 142. The plurality of cylindrical cells are arranged in sequence along the first direction X. The two sides of the battery module 300 along the second direction Y are curved. The partition 100 is also curved. Each arc segment 141 accommodates a portion of a cylindrical cell of a battery module 300 adjacent to the partition 100 or accommodates a portion of more than one cylindrical cell of a battery module 300 adjacent to the partition 100. Each second arc segment 142 accommodates a portion of a cylindrical cell of another battery module 300 adjacent to the partition 100 or accommodates a portion of more than one cylindrical cell of another battery module 300 adjacent to the partition 100. The projection of the separator 100 along the first direction X partially overlaps with the projection of the adjacent battery module 300 .

[0111] In the embodiment of the present application, the gaps between the battery cells are fully utilized, which is beneficial to reducing the size of the battery pack 10 along the second direction Y.

[0112] See also Fig.14 , Fig.14 A cross-sectional view of a battery pack 10 along the XZ plane provided in one embodiment of the present application. In one embodiment, the battery pack 10 further includes a first sealing structure 410, and the first sealing structure 410 is used to seal the partition 100 and the bottom plate 210, and the first sealing structure 410 is located between the partition 100 and the bottom plate 210. Among them, along the arrangement direction of the partition 100 and the bottom plate 210, the first sealing structure 410 fills the gap between the partition 100 and the bottom plate 210 so that the partition 100 and the bottom plate 210 are sealed and connected. The provision of the first sealing structure 410 can improve the reliability of the sealing between the partition 100 and the bottom plate 210, so that the partition 100 can effectively block the flow of the electrolyte.

[0113] See also Fig.14In one embodiment, the battery pack 10 further includes two second sealing structures 420, one second sealing structure 420 is used to seal one end of the partition 100 and a first side plate 221, and the other second sealing structure 420 is used to seal the other end of the partition 100 and the other first side plate 221. One second sealing structure 420 is located between one end of the partition 100 and a first side plate, and the other second sealing structure 420 is located between the other end of the partition 100 and the other first side plate 221. Among them, along the extension direction of the partition 100, the second sealing structure 420 fills the gap between the partition 100 and the surrounding side frame 220 so that the partition 100 and the surrounding side frame 220 are sealed and connected. The provision of the second sealing structure 420 can improve the reliability of the sealing between the partition 100 and the surrounding side frame 220, so that the partition 100 can effectively block the flow of electrolyte.

[0114] In one embodiment, the first sealing structure 410 and the second sealing structure 420 may be cured glue. The partition plate 100 is sealed and connected with the bottom plate 210 and the peripheral side frame 220 by the glue.

[0115] In one embodiment, the partition 100, the bottom plate 210 and the surrounding side frame 220 are an integrated structure. The partition 100, the bottom plate 210 and the surrounding side frame 220 are integrally formed, which improves the reliability of the connection and the sealing between the partition 100 and the bottom plate 210 and the partition 100 and the surrounding side frame 220.

[0116] The battery pack and energy storage system provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A housing, the housing comprising a bottom plate and a peripheral side frame, the bottom plate and the peripheral side frame are connected to form a receiving cavity, the receiving cavity is used to receive a plurality of battery modules, and the bottom plate is used to fix the plurality of battery modules; At least one partition is accommodated in the accommodating cavity, each of the partitions is arranged between two adjacent battery modules, each of the partitions is sealed and connected to the bottom plate, and both ends of each of the partitions are sealed and connected to the peripheral side frames.

2. The battery pack according to claim 1, characterized in that: Along the arrangement direction of the partition plate and the bottom plate, the height of the partition plate is smaller than the height of the peripheral side frame.

3. The battery pack according to claim 1, characterized in that: The height of the partition along the arrangement direction of the partition and the bottom plate is greater than the width of the partition along the arrangement direction of the partition and the battery module, and is less than the length of the partition along the extension direction of the partition.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The partition includes two connected first sub-plates, and along the arrangement direction of the partition and the bottom plate, one of the first sub-plates is arranged between the other first sub-plate and the bottom plate; wherein: The width of the first sub-plate along the arrangement direction of the partition and the battery module is greater than the width of the other first sub-plate; A height of the first sub-board along an arrangement direction of the partition board and the bottom board is less than or equal to a height of the other first sub-board.

5. The battery pack according to any one of claims 1 to 3, characterized in that: The partition includes a second sub-plate and two third sub-plates. Along the extension direction of the partition, the second sub-plate is arranged between the two third sub-plates. The two third sub-plates are used to be sealed and connected with the peripheral side frame; wherein: The width of the third sub-board along the arrangement direction of the partition and the battery module is greater than the width of the second sub-board; The length of the third sub-plate along the extending direction of the partition is smaller than the length of the second sub-plate.

6. The battery pack according to any one of claims 1 to 3, characterized in that: The partition includes two end surfaces, and the two end surfaces are opposite to each other along the arrangement direction of the partition and the battery module; At least one of the end faces includes a plurality of spaced-apart protrusion structures, which protrude from one end face toward a direction away from another end face, and a width of the protrusion structure along the arrangement direction of the partition and the battery module is greater than or equal to the spacing between the two end faces.

7. The battery pack according to claim 6, characterized in that: Along the extension direction of the protruding structure, the protruding structure includes two ends, one end of the protruding structure is used to be fixed to an end surface of the partition, and along the arrangement direction of the partition and the bottom plate, the distance between one end of the protruding structure and the bottom plate is greater than or equal to the distance between the other end of the protruding structure and the bottom plate.

8. The battery pack according to any one of claims 1 to 3, characterized in that: The maximum length of the partition is greater than or equal to the length of the peripheral side frame along the extending direction of the partition.

9. The battery pack according to claim 8, characterized in that: The partition includes a plurality of first arc segments and a plurality of second arc segments, the plurality of first arc segments and the plurality of second arc segments are alternately arranged along the extension direction of the partition, and the opening directions of the first arc segments and the second arc segments are opposite to the arrangement direction of the partition and the battery module; wherein: Each of the battery modules includes a plurality of cylindrical battery cells, wherein the cylindrical battery cell portion of one of the two adjacent battery modules is accommodated in the plurality of first arc segments, and the cylindrical battery cell portion of the other of the two adjacent battery modules is accommodated in the plurality of second arc segments.

10. The battery pack according to any one of claims 1 to 3, characterized in that: The battery pack further includes a first sealing structure and two second sealing structures, wherein the first sealing structure is located between the partition and the bottom plate, and the first sealing structure is used to seal the partition and the bottom plate; The peripheral side frame includes two first side plates arranged relatively to each other along the extension direction of the partition, one second sealing structure is located between one end of the partition and one of the first side plates, and the other second sealing structure is located between the other end of the partition and the other first side plate, the one second sealing structure is used to seal one end of the partition and the one first side plate, and the other second sealing structure is used to seal the other end of the partition and the other first side plate.

11. The battery pack according to any one of claims 1 to 3, characterized in that: The battery pack comprises a plurality of battery modules, the plurality of battery modules are arranged at intervals along the arrangement direction of the battery modules and the partition, each of the battery modules comprises a plurality of battery cells, and the plurality of battery cells are arranged in sequence along the extension direction of the partition; Each of the partitions is spaced apart from the two adjacent battery modules along the arrangement direction of the battery modules and the partitions, and the width of the partition along the arrangement direction of the battery modules and the partitions is smaller than the spacing between the two adjacent battery modules.

12. The battery pack according to claim 11, characterized in that: Along the arrangement direction of the battery modules and the partition, the distance between the partition and the two adjacent battery modules is greater than 1 mm and less than 5 mm; The height of the partition along the arrangement direction of the partition and the bottom plate is greater than or equal to 5 mm and less than or equal to the height of the battery module.

13. The battery pack according to any one of claims 1 to 3, characterized in that: The peripheral side frame further includes two second side plates arranged opposite to each other along the arrangement direction of the partition plate and the battery module; The at least one partition is spaced apart from the two second side plates, and a gap between the at least one partition and each of the second side plates is used to accommodate at least one battery module.

14. The battery pack according to any one of claims 1 to 3, characterized in that: The at least one partition is a plurality of partitions, and the plurality of partitions are arranged in sequence and spaced apart from each other, and the gap between any two adjacent partitions is used to accommodate at least one battery module.

15. An energy storage system, characterized in that: It comprises a power conversion module and a plurality of battery packs as described in any one of claims 1 to 14, wherein the power converter is connected to the plurality of battery packs and is used for performing power conversion on the current input into or output from the battery pack.

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