Battery pack and energy storage device

Abstract

Provided in the embodiments of the present application are a battery pack and an energy storage device. The battery pack comprises a housing, and a separator, battery modules and battery management units, which are arranged in the housing, wherein the battery management units are arranged on the separator; the separator is fixed in the housing, and divides a space in the housing into a battery compartment and a power distribution compartment that are distributed in a first direction; the battery management units are located in the power distribution compartment; the battery modules are located in the battery compartment; and the battery management units are electrically connected to the battery modules. The present application can achieve the separation of the battery compartment from the power distribution compartment, suppress moisture cross-flow that causes condensation, and reduce the baking of the battery compartment by a board, thereby improving the temperature consistency of batteries at the ends of modules. By means of the design of the structure of a compartment separation board, the compartment separation board has the function of integrated BMU installation; rapid installation is achieved by means of snap-fitting; and during production, assembly preprocessing can be performed on a branch line, and an assembly is then installed in the PACK, such that the assembly and replacement efficiency can be improved.

Description

Battery packs and energy storage devices

[0001] This application claims priority to Chinese Patent Application No. 202421235289.0, filed on May 31, 2024, entitled “Battery Pack and Energy Storage Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a battery pack and energy storage device. Background Technology

[0003] In related technologies, battery packs, battery management units, and other electronic devices, as well as battery modules, are all assembled inside the battery pack casing. Since most of the space inside the casing is occupied by the battery modules, the space available for installing the battery management units and other electronic devices is limited. This makes it difficult to assemble the battery management units and other electronic devices, and the placement of these devices is difficult to optimize. As a result, when the battery pack is in operation, the cells in the battery modules closest to the battery management unit experience a higher temperature than cells in other locations due to the baking effect of the battery management unit on adjacent cells. This leads to a decrease in the uniformity of cell temperature within the battery pack.

[0004] Application content

[0005] The embodiments of this application provide a battery pack and energy storage device to solve the problem of low temperature uniformity of battery cells within the battery pack.

[0006] In a first aspect, embodiments of this application provide a battery pack, which includes a housing and an isolator, a battery module, and a battery management unit built into the housing. The battery management unit is disposed on the isolator, which is fixed inside the housing and divides the space inside the housing into a battery compartment and a power distribution compartment distributed along a first direction. The battery management unit is located in the power distribution compartment, the battery module is located in the battery compartment, and the battery management unit is electrically connected to the battery module.

[0007] In this embodiment, electronic components such as the battery management unit can be first mounted on the separator to form an integrated module structure, and then the module structure can be fixed to the outer casing. This effectively reduces assembly difficulty and improves assembly convenience. Furthermore, since the battery management unit and separator can be assembled outside the casing first, the placement of the battery management unit is easier, resulting in a more rational layout of the electronic components. In this embodiment, the rational layout of the separator and battery management unit allows for separate compartment assembly of the battery module and battery management unit, effectively reducing the impact of heat from the battery management unit on the battery module. This reduces the baking of adjacent battery module cells by the battery management unit, improving the temperature uniformity of each cell in the battery module. In addition, since the battery compartment and power distribution compartment are separated by the separator, even if condensation occurs in the battery module in the battery compartment due to its large heat capacity, it can be effectively prevented from flowing into the power distribution compartment. This effectively reduces the risk of electrical arcing caused by contact with condensation in the battery management unit within the power distribution compartment. Furthermore, by incorporating insulating components, heat transfer between the battery compartment and the power distribution compartment can be effectively blocked. Therefore, the temperature within the power distribution compartment is less affected by the temperature within the battery compartment, and its temperature changes do not lag behind the surrounding temperature, preventing a temperature difference and reducing the risk of condensation on the battery management unit. Additionally, in the event of thermal runaway and electrolyte ejection from the battery module cells, the insulating components effectively prevent electrolyte from spraying onto the battery management unit, thus significantly reducing the risk of electrical arcing in the battery management unit.

[0008] In some embodiments, the separator includes a base plate and an integrally formed upright plate. The upright plate divides the space within the housing into a battery compartment and a power distribution compartment. The base plate is fixed to the base of the housing and is located on the side of the upright plate opposite to the battery module. The battery management unit is assembled on the side of the upright plate opposite to the battery module. In this embodiment, electronic components can be integrated and mounted on the base plate and the upright plate to form an integrated module structure, and then the module structure can be fixed to the housing as a whole, thereby effectively reducing assembly difficulty and improving assembly convenience. Furthermore, since the base plate is located on the side of the upright plate opposite to the battery module, some electronic components can be integrated and mounted on the base plate, improving the ability to integrate electronic components on the separator.

[0009] In some embodiments, the side of the separator facing away from the battery module has a mounting slot, and the battery management unit is installed in the mounting slot. In this embodiment, by providing a mounting slot on the upright plate, an installation position can be reserved for the battery management unit, thereby facilitating integrated design. Moreover, by installing the battery management unit in the mounting slot, the stability of the connection between the battery management unit and the separator can be effectively ensured.

[0010] In some embodiments, the battery management unit includes a bottom shell, a cover, and a sampling plate. The cover is snap-fitted to the bottom shell and forms a receiving cavity, within which the sampling plate is located. The bottom shell is disposed within an assembly slot, and the cover is snap-fitted to a spacer. In this embodiment, the snap-fit ​​connection between the bottom shell and the cover improves the ease of connection between them. Furthermore, the sampling plate is disposed within the receiving cavity formed by the bottom shell and the cover, thus providing adequate protection for the sampling plate and preventing short circuits between it and other electronic components, such as wires.

[0011] In some embodiments, the battery pack further includes a flexible circuit board and a first connection terminal. The flexible circuit board is located between the battery module and the top wall of the casing, and is electrically connected to the battery cells of the battery module. The flexible circuit board extends along a first direction, with a portion extending into the power distribution compartment. The first connection terminal is connected to the portion of the flexible circuit board extending into the power distribution compartment. The battery management unit also includes a second connection terminal connected to the sampling board, and the first and second connection terminals are connected. In this embodiment, because the flexible circuit board is located between the battery module and the top wall of the casing, it facilitates convenient electrical connection to the battery cells of the battery module. The flexible circuit board extends along the first direction to facilitate convenient electrical connection to all the battery cells of the battery module. Moreover, the method of connecting the flexible circuit board and the sampling board through the first and second connection terminals can effectively reduce the connection difficulty and improve the connection efficiency.

[0012] In some embodiments, the battery pack further includes a positive external interface and a negative external interface. The battery pack also includes a first wire for connecting the positive external interface and the positive terminal of the battery module, and a second wire for connecting the negative external interface and the negative terminal of the battery module. The first and second wires are disposed on an insulating component and located within the power distribution compartment. In this embodiment, both the first and second wires are located within the power distribution compartment. Due to the heat insulation effect of the insulating component on the power distribution compartment and the battery compartment, the risk of electrical arcing caused by condensation on the first and second wires can be effectively reduced.

[0013] In some embodiments, the separator includes a base plate and an integrally formed upright plate. The upright plate divides the space within the housing into a battery compartment and a power distribution compartment. The base plate is fixed to the base of the housing and is located on the side of the upright plate opposite to the battery module. The second conductor includes a first portion extending along the width direction of the battery pack and a second portion extending from the end of the first portion along the height direction of the battery pack. The first portion is disposed on the base plate, and the second portion is disposed on the upright plate. In this embodiment, the first portion of the second conductor is disposed on the base plate, and the length direction of the base plate is the width direction of the battery pack, which is also the extension direction of the first portion. This allows the first portion, which has a relatively long span, to be reasonably disposed on the base plate. The second portion is connected to the end of the first portion, and the extension direction of the second portion is along the height direction of the battery pack. This allows the second portion to extend to the negative terminal of the battery module for connection. This design can streamline the wiring of the long second conductor.

[0014] In some embodiments, the upright plate has wire grooves at both ends in the width direction of the battery pack, and the bottom plate has wire grooves, with a first part passing through the wire groove on the bottom plate and a second part passing through the wire groove on the upright plate. In this embodiment, the wire grooves allow both the first and second parts to be stably mounted on the separator, and also facilitate the integrated design of the second wire with the separator.

[0015] In some embodiments, the battery pack also includes a fuse disposed on the separator, the fuse being connected to a first conductor or a second conductor. In this embodiment, because the fuse is connected to the first conductor or the second conductor, in the event of a system failure or a battery pack failure (such as a short circuit), the fuse can quickly disconnect the circuit, thereby ensuring the safety of the battery pack throughout its entire lifecycle, from manufacturing, transportation, storage, maintenance, and operation.

[0016] In some embodiments, the battery pack also includes a power board for controlling the battery modules, which is located in the power distribution compartment. In this embodiment, the battery modules and the power board are assembled in separate compartments using an isolator, which effectively reduces the impact of heat generated by the power board during operation on the battery modules. This reduces the baking of the battery cells in adjacent battery modules by the power board and improves the temperature uniformity of the cells in the battery module. Furthermore, when a battery cell in the battery module experiences thermal runaway and ejects electrolyte, the isolator effectively prevents the electrolyte from spraying onto the power board, thereby effectively reducing the risk of electrical arcing on the power board.

[0017] In some embodiments, the housing includes a front wall and a rear wall opposite each other in a first direction, an insulator is located between the battery module and the front wall, and a power board is disposed on the side of the front wall facing the insulator. In this embodiment, since the power board is disposed on the side of the front wall facing the insulator, the heat of the power board can be dissipated through the front wall as much as possible. In addition, the insulator further reduces the impact of the heat generated by the power board on the battery module inside the battery compartment.

[0018] In some embodiments, the battery module includes multiple battery cells arranged along a first direction, and the separator is elongated, extending along the width direction of the battery pack. The first direction is consistent with the length direction of the battery pack. In this embodiment, since the multiple battery cells of the battery module are arranged in the first direction, and the length direction is the same as the width direction of the battery pack, the battery management unit is installed at the end of the multiple battery cells in the battery module. This allows for flexible and convenient adjustment of the position of the battery management unit and supports design optimization and iterative evolution of the battery module in the first direction. Furthermore, since the separator is elongated and extends along the width direction of the battery pack, it can isolate the battery module, power board, and battery management unit as much as possible while avoiding the separator occupying too much space in the first direction.

[0019] In some embodiments, the two ends of the spacer protrude beyond the two ends of the battery module in the width direction of the battery pack. In this embodiment, because the two ends of the spacer protrude beyond the two ends of the battery module in the width direction of the battery pack, each position of the battery module can be effectively separated from the electronic components in the power distribution compartment by the spacer in the width direction of the battery pack, thereby reducing the impact of heat generated by the electronic components in the power distribution compartment on the battery module. It can also effectively reduce the heat transfer from the battery compartment to the power distribution compartment, thereby preventing the formation of condensation in the power distribution compartment.

[0020] In some embodiments, a gap is left between the separator and the top wall of the casing. The battery pack also includes foam strips, which are disposed in the gap area between the top wall of the casing and the separator in the height direction of the battery pack, and the height direction of the battery pack is perpendicular to the first direction. In this embodiment, since the foam strips are disposed between the battery module and the top wall of the casing, the electrolyte ejected from the battery module cells can be effectively prevented from spraying onto the power distribution compartment, thereby preventing electrical arcing of electronic components (power boards, battery management units, copper busbars, etc.) located in the power distribution compartment.

[0021] Secondly, embodiments of this application provide an energy storage device, including a cabinet and a plurality of battery packs as described in any of the first aspects above, wherein the plurality of battery packs are stacked inside the cabinet. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 is a simplified structural diagram of an energy storage device provided in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of a battery pack provided in an embodiment of this application;

[0025] Figure 3 is a partial structural diagram of the battery pack in the embodiment of Figure 2 after part of the casing has been hidden;

[0026] Figure 4 is a partial structural diagram of the battery pack in the embodiment of Figure 2 after some of the structure has been hidden.

[0027] Figure 5 is a schematic diagram of the installation position of the power board of the battery pack in Figure 2;

[0028] Figure 6 is a schematic diagram of the structure of the separator in Figure 2;

[0029] Figure 7 is a schematic diagram of the assembly structure of the battery pack separator and battery management unit in Figure 2;

[0030] Figure 8 is a schematic diagram of the battery management unit of the battery pack in the embodiment of Figure 2;

[0031] Figure 9 is an exploded view of the battery management unit in Figure 8;

[0032] Figure 10 is a magnified view of part A in Figure 3;

[0033] Figure 11 is a magnified view of part B in Figure 3.

[0034] Explanation of reference numerals in the attached drawings: L, first direction; X, length direction of the battery pack; Y, length direction of the battery pack; Z, length direction of the battery pack; 1, energy storage device; 2, cabinet; 3, battery pack; 4, signal interface; 5, positive external interface; 6, negative external interface; 7, busbar; 8, module structure; 10, outer shell; 101, battery compartment; 102, power distribution compartment; 11, base; 12, housing; 121, front wall; 1211, heat dissipation fins; 122, rear wall; 123, side wall; 124, top wall; 20, battery module; 21, cell; 22, positive connector; 23, negative connector; 24, cable tie; 25, end plate; 30, battery management unit; 31, locking part; 32, bottom shell; 321, buckle; 33, cover; 331, slot; 34, sampling plate; 35. 36. Receiving cavity; 40. Second connecting terminal; 41. Power board; 42. Mounting cavity; 50. Cover plate; 51. Flexible circuit board; 52. First connecting terminal; 60. Isolator; 61. Base plate; 62. Vertical plate; 621. Assembly slot; 622. Wire harness fixing clip; 63. Wire groove; 64. Mounting slot; 65. Mating part; 66. Fixing hole; 71. First wire; 72. Second wire; 721. First part; 722. Second part; 80. Fuse; 90. Foam strip. Detailed Implementation

[0035] The following section will first explain some of the terms used in the embodiments of this application.

[0036] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] In this specification, the terms "vertical" and "parallel" are explained.

[0038] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0039] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, allowing for situations where the parallelism is not absolute due to factors such as assembly tolerances, design tolerances, and structural flatness. These situations may lead to the sliding mating part and the first door panel not being absolutely parallel, but this application also defines such situations as parallelism.

[0040] Figure 1 is a simplified structural diagram of an energy storage device 1 provided in an embodiment of this application.

[0041] Referring to Figure 1, the energy storage device 1 includes a cabinet 2 and multiple battery packs 3 disposed within the cabinet 2, with the multiple battery packs 3 stacked within the cabinet 2. Electrical energy can be stored or output through the multiple battery packs 3.

[0042] To facilitate understanding of the energy storage device 1 provided in this application embodiment, its application scenarios are described below. The energy storage device 1 is a system that can store electrical energy through a certain medium and release the stored energy to generate electricity when needed. It can be used as a load balancing device and backup power source in everyday home environments, industrial and commercial parks, large ground-mounted power stations, or photovoltaic-storage systems, among other scenarios. The application of the energy storage device 1 will be briefly explained using a photovoltaic-storage system as an example. A photovoltaic-storage system typically includes photovoltaic modules, an energy storage converter, the energy storage device 1, and a grid-connected inverter. The photovoltaic modules convert light energy into direct current (DC) electricity and output it to the grid-connected inverter; the grid-connected inverter converts the DC electricity into alternating current (AC) electricity and transmits this AC electricity to the power grid, thereby achieving grid connection of the photovoltaic-storage system.

[0043] Figure 2 is a structural schematic diagram of a battery pack 3 provided in an embodiment of this application; Figure 3 is a partial structural schematic diagram of the battery pack 3 in the embodiment of Figure 2 after the shell 12 is hidden. The battery pack 3 in the embodiment of Figure 2 can be applied not only to the energy storage device 1 in the embodiment of Figure 1, but also to the automotive field or other fields that require the use of the battery pack 3.

[0044] Referring to Figures 2 and 3, the battery pack 3 includes a housing 10 and a battery module 20, a battery management unit 30, and a power board 40 housed within the housing 10 (as shown in Figure 5).

[0045] In some embodiments, the housing 10 includes a base 11 and a housing 12 connected to the base 11, the housing 12 being used to accommodate the battery module 20 after being connected to the base 11.

[0046] The housing 12 includes a front wall 121 and a rear wall 122 opposite each other in the length Z direction of the battery pack 3, two side walls 123 opposite each other in the width direction of the battery pack 3, and a top wall 124 opposite to the base 11 in the height direction of the battery pack 3. The two side walls 123, the front wall 121 and the rear wall 122 are connected between the top wall 124 and the base 11, and together form a receiving cavity, which can be used to house the battery module 20, the battery management unit 30 and the power board 40.

[0047] The base 11 includes a base plate 61 and a side plate connected to the periphery of the base plate 61. The side plate and the base plate 61 enclose a limiting storage groove, and the battery module 20 is assembled into the limiting storage groove.

[0048] In some embodiments, there are multiple battery modules 20 arranged side by side inside the housing 10.

[0049] The battery module 20 includes multiple battery cells 21 arranged together, and end plates 25 (as shown in Figure 11) and cable ties 24 binding the multiple battery cells 21 at both ends along the arrangement direction. The arrangement direction of the multiple battery cells 21 is the length direction Z of the battery pack 3. The multiple battery cells 21 can be bound together by the end plates 25 and cable ties 24 at both ends to facilitate handling and reduce the gap between adjacent battery cells 21, thereby improving energy density.

[0050] In some embodiments, the pressure relief valves of the multiple cells 21 are all oriented toward the top wall 124.

[0051] In some implementations, the Battery Management Unit (BMU) 30 is used to monitor the battery's operating status to ensure its safe and stable operation. For example, the BMU monitors key parameters such as voltage, current, and temperature of the battery cells 21 in the battery module 20 to promptly detect abnormalities and ensure the safe operation of the battery.

[0052] In some embodiments, the battery pack 3 also includes a flexible printed circuit board 50 (FPC), which is electrically connected between the multiple cells 21 of the battery module 20 and the battery management unit 30. The flexible printed circuit board 50 is used to measure the operating status of the multiple cells 21 of the battery module 20 and feed it back to the battery management unit 30, such as transmitting the measured key parameters of the multiple cells 21, such as voltage, current, and temperature, to the battery management unit 30.

[0053] The flexible circuit board 50 extends along the length direction Z of the battery pack 3, so that each battery module 20 is provided with a flexible circuit board 50. The flexible circuit board 50 can be connected to all the cells 21 of the battery module 20 so as to detect the status of all the cells 21 of the battery module 20.

[0054] Similarly, a flexible circuit board 50 can be connected to only one battery management unit 30, and a battery management unit 30 can monitor the operating status of only one battery module 20. Since the battery pack 3 can include multiple battery modules 20, the battery pack 3 can be equipped with multiple battery management units 30 and multiple flexible circuit boards 50.

[0055] In some embodiments, the flexible circuit board 50 is disposed between the top wall 124 battery modules 20.

[0056] In some implementations, the power board 40 is used to control the battery module 20, such as to perform active balancing and power conversion of the battery module 20, in order to manage charging and discharging and ensure the safe and efficient operation of the battery module 20.

[0057] In some embodiments, the battery pack 3 also includes a signal interface 4, which is located on the front wall 121. The battery management unit 30 and the power board 40 are connected to the signal interface 4 via wires to transmit the signals received by the battery management unit 30 and the power board 40 of the battery pack 3 to the outside or to receive external signals.

[0058] Figure 4 is a partial structural diagram of the battery pack 3 in the embodiment of Figure 2 after some of the structure has been hidden.

[0059] Referring to Figures 2-4, in some embodiments, the battery pack 3 further includes an isolator 60. The battery management unit 30 and the isolator 60 are assembled into an integrated module structure 8, which is located inside the housing 10. In this embodiment, the battery management unit 30 and other electronic components can be integrated and mounted on the isolator 60 to form an integrated module structure 8, and then the module structure 8 can be fixed to the housing 10 as a whole. This effectively reduces assembly difficulty and improves assembly convenience. Since the battery management unit 30 and the isolator 60 can be assembled outside the housing 10 first, the position layout of the battery management unit 30 is easier, and the position layout of the battery management unit 30 and other electronic components is more rational. Through the rational layout of the isolator 60 and the battery management unit 30, the isolator 60 can assemble the battery module 20 and the battery management unit 30 in separate compartments.

[0060] In some embodiments, the separator 60 divides the outer casing 10 into a battery compartment 101 and a power distribution compartment 102 distributed along a first direction L. The battery compartment 101 is mainly used to house the battery module 20, while the power distribution compartment 102 is mainly used to house electronic components such as the battery management unit 30 and the power board 40. In this embodiment, by assembling the battery module 20, power board 40, and battery management unit 30 in separate compartments using the separator 60, the impact of heat generated by the battery management unit 30 and power board 40 during operation on the battery module 20 can be effectively reduced. This reduces the baking effect of the power board 40 and battery management unit 30 on the adjacent battery cells 21 of the battery module 20, improving the temperature uniformity of each cell 21 in the battery module 20. Furthermore, since the battery compartment 101 and the power distribution compartment 102 are separated by the insulating component 60, even if condensation occurs in the battery module 20 of the battery compartment 101 due to its large heat capacity, the condensation can be effectively prevented from flowing to the power distribution compartment 102. This effectively prevents electrical arcing caused by contact between the electronic components (such as battery management boards, power boards 40, or connecting wires) in the power distribution compartment 102 and the condensation. Moreover, by setting the insulating component 60, heat transfer between the battery compartment 101 and the power distribution compartment 102 can also be effectively blocked. Therefore, the temperature change in the power distribution compartment 102 is not significantly affected by the temperature in the battery compartment 101, and there is no temperature difference with the surrounding temperature, thereby reducing the risk of condensation on the electronic components in the power distribution compartment 102. Furthermore, when the battery cell 21 of the battery module 20 experiences thermal runaway and ejects electrolyte, the isolation component 60 can effectively prevent the electrolyte from spraying onto the power board 40 or the battery management unit 30, thereby effectively reducing the risk of electrical arcing of the power board 40 or the battery management unit 30.

[0061] The separator 60 is made of insulating material, thereby increasing the creepage distance between the battery module 20 and the electronic devices disposed in the power distribution compartment 102 through the separation of the separator 60, and effectively preventing electrical arcing between the battery cell 21 of the battery module 20 and the electronic devices.

[0062] The insulating component 60 is made of a material with low thermal conductivity. Because the insulating component 60 is made of a material with low thermal conductivity, it can effectively block heat transfer between the power distribution compartment 102 and the battery compartment 101, and effectively block heat transfer from the battery management unit 30 and the power board 40 to the battery module 20. This can effectively reduce the baking effect on the battery module 20 when the battery management unit 30 and the power board 40 generate heat during operation.

[0063] In some embodiments, the thermal conductivity of the insulating element 60 is less than 0.3 W / (m*K). For example, the insulating element 60 can be made of engineering plastics such as PC, ABS, PA, etc.

[0064] It is understood that in some other embodiments, the insulating member 60 may also be made of a metal material coated with a heat-insulating and low thermal conductivity material, which can not only ensure the functions of insulation and heat insulation, but also effectively improve the supporting strength of the insulating member 60.

[0065] In some embodiments, the first direction L is consistent with the length direction Z of the battery pack 3. The separator 60 has an elongated structure, and the extension direction of the separator 60 is the width direction of the battery pack 3, that is, the length direction of the separator 60 is the width direction of the battery pack 3. It can be understood that the width direction, the length direction Z of the battery pack 3, and the height direction of the battery pack 3 are all perpendicular to each other. The length direction of the separator 60 refers to the direction of extension when the separator 60 is elongated. Because the separator 60 is elongated and its length direction is the same as the width direction of the battery pack 3, it can isolate the battery module 20, power board 40, and battery management unit 30 as much as possible while avoiding the separator 60 occupying a large space in the first direction L.

[0066] In some embodiments, the two ends of the insulating member 60 protrude beyond the two ends of the battery module 20 in the width direction of the battery pack 3. Because the two ends of the insulating member 60 protrude beyond the two ends of the battery module 20 in the width direction of the battery pack 3, each position of the battery module 20 can be effectively separated from the electronic components in the power distribution compartment 102 by the insulating member 60 in the width direction of the battery pack 3, thereby reducing the impact of heat generated by the electronic components in the power distribution compartment 102 on the battery module 20. It also effectively reduces the heat transfer from the battery compartment 101 to the power distribution compartment 102, preventing condensation from forming in the power distribution compartment 102.

[0067] Furthermore, since the battery management unit 30 is installed at the end of the battery module 20 in the first direction L, its position can be flexibly and conveniently adjusted, and the battery module 20 can be optimized and iteratively evolved in the first direction L.

[0068] In some embodiments, along the width direction of the battery pack 3, both ends of the separator 60 extend substantially to the two side walls 123 of the housing 12, so that the battery compartment 101 and the power distribution compartment 102 are separated as much as possible to reduce the impact of the electronic devices in the power distribution compartment 102 on the battery module 20.

[0069] It is understood that in some other embodiments, the first direction L may also be the width direction of the battery pack 3 or the height direction of the battery pack 3, etc.

[0070] Figure 5 is a schematic diagram of the installation position of the power board 40 of the battery pack 3 in Figure 2.

[0071] Referring to Figures 2-5, in some embodiments, the separator 60 is located between the battery module 20 and the front wall 121, and the power board 40 is disposed on the side of the front wall 121 facing the separator 60. In this embodiment, in the first direction L, the area between the separator 60 and the front wall 121 is the power distribution compartment 102. Since the power board 40 is disposed on the side of the front wall 121 facing the separator 60, the heat of the power board 40 can be dissipated through the front wall 121 as much as possible. In addition, the heat generated by the separator 60 can further reduce the impact of the heat generated by the power board 40 on the battery module 20 inside the battery compartment 101.

[0072] In some embodiments, heat dissipation fins 1211 are provided on the front wall 121, and the power board 40 is also provided on the front wall 121, so that the heat dissipation effect of the power board 40 can be further improved by the arrangement of heat dissipation fins 1211.

[0073] In some embodiments, the front wall 121 has a mounting cavity 41 and a cover plate 42 for sealing the mounting cavity 41 on the side facing the isolator 60. The power board 40 is disposed in the mounting cavity 41. After the power board 40 is assembled in the mounting cavity 41, the cover plate 42 can seal the power board 40 in the mounting cavity 41. It is understood that power devices, such as various diodes, transistors, resistors, capacitors, or inductors, can be integrated on the power board 40. Since the power board 40 is sealed in the mounting cavity 41, more of the heat generated by the power board 40 can be dissipated through the front wall 121. Moreover, since the power board 40 is sealed in the mounting cavity 41, the impact of the power board 40 on other electronic devices in the power distribution compartment 102 can also be effectively reduced, such as the mutual influence between the power board 40 and the battery management unit 30.

[0074] Referring to Figures 3 and 5, in some embodiments, the battery pack 3 further includes a positive external interface 5 and a negative external interface 6 disposed on the front wall 121. The positive external interface 5 is connected to the positive terminal 22 of the battery module 20, and the negative external interface 6 is used to connect to the negative terminal 23 of the battery module 20. Other external interfaces of the battery pack 3 may also be provided on the front wall 121, such as interfaces for connecting to the power board 40 or the battery management unit 30. Since the multiple battery packs 3 in the energy storage device 1 are basically stacked, the front wall 121 of the battery pack 3 is usually exposed, while the top wall 124, base 11, etc. of the battery pack 3 are used to abut against the base 11, top wall 124, etc. of other battery packs 3. Therefore, placing the positive external interface 5 and the negative external interface 6 on the front wall 121 facilitates the connection between multiple battery packs 3. Furthermore, the power board 40 and battery management unit 30 and other electronic devices are housed in the power distribution compartment 102 between the isolation member 60 and the front wall 121. Since the front wall 121 is exposed, heat dissipation efficiency can be improved through the front wall 121.

[0075] Figure 6 is a schematic diagram of the structure of the separator 60 of the battery pack 3 in Figure 2.

[0076] Referring to Figure 6, in some embodiments, the isolation member 60 includes a base plate 61 and an upright plate 62 integrally formed with the base plate 61. Both the upright plate 62 and the base plate 61 are elongated, and the length direction of the upright plate 62 and the base plate 61 is the same.

[0077] A mounting slot 621 is provided on one side of the upright plate 62 for mounting the battery management unit 30. It can be understood that there can be multiple mounting slots 621 to mount multiple battery management units 30, and the multiple mounting slots 621 are arranged at intervals along the length of the upright plate 62.

[0078] The upright plate 62 has a wire harness fixing clip 622 on one side of the mounting groove 621. There can be multiple wire harness fixing clips 622. The wire harness fixing clips 622 are used to fix and constrain the wires to avoid the wires from being too messy.

[0079] The upright plate 62 has a wire groove 63 for constraining the copper busbar on one side of the mounting groove 621.

[0080] In some embodiments, the upright plate 62 is provided with two wire grooves 63, which are located at two ends of the upright plate 62 along its length.

[0081] In some embodiments, the base plate 61 and the upright plate 62 are approximately perpendicular. The base plate 61 is used to fix the base 11, for example, the base plate 61 and the base 11 can be fixedly connected by bolts or screws. Since the base plate 61 and the upright plate 62 are approximately perpendicular, after the base plate 61 and the base 11 are fixed, the upright plate 62 can be ensured to be in a vertically placed state.

[0082] The base plate 61 is also provided with a wire groove 63 for constraining the copper busbar.

[0083] The base plate 61 is also provided with a mounting groove 64 for mounting the fuse 80 (as shown in Figure 7).

[0084] Figure 7 is a schematic diagram of the assembly structure of the separator 60 and the battery management unit 30 of the battery pack 3 in Figure 2.

[0085] Referring to Figures 6 and 7, in some embodiments, the battery management unit 30 is snap-fitted 321 onto the side of the separator 60 facing away from the battery module 20. Since the separator 60 and the battery management unit 30 are snap-fitted 321, the connection efficiency between the battery management unit 30 and the separator 60 can be improved. Furthermore, since the battery management unit 30 is connected to the separator 60, the assembly efficiency can be improved and the assembly difficulty reduced by first fixing the battery management unit 30 to the separator 60 and then assembling the separator 60 onto the housing 10.

[0086] In some embodiments, the battery management unit 30 is mounted within the mounting slot 621. By mounting the battery management unit 30 within the mounting slot 621, the stability of the connection between the battery management unit 30 and the separator 60 can be effectively ensured.

[0087] In some embodiments, the battery management unit 30 is provided with a locking part 31, and the separator 60 is provided with a mating part 65. The mating part 65 is located at the edge of the assembly groove 621. After the battery management unit 30 is installed in the assembly groove 621, the locking part 31 engages with the mating part 65. The mating part 65 can limit the locking part 31 to prevent the battery management unit 30 from detaching from the assembly groove 621.

[0088] In some embodiments, the separator 60 is also provided with a fixing hole 66, and the battery management unit 30 can be fixed to the separator 60 by means of bolts connected to the fixing hole 66. It is understood that in some other embodiments, the separator 60 and the battery management unit 30 are fixed by both bolts and clips 321 to improve the stability of the connection between the battery management unit 30 and the separator 60.

[0089] In some embodiments, the upright plate 62 is used to divide the outer casing 10 into a battery compartment 101 and a power distribution compartment 102 adjacent along a first direction L. The base plate 61 is fixed to the base 11 of the outer casing 10, and the base plate 61 is located on the side of the upright plate 62 away from the battery module 20. In this embodiment, the spacer 60 is fixed to the base 11 by the base plate 61, making the assembly method between the spacer 60 and the base 11 more reasonable. Moreover, since the base plate 61 is located on the side of the upright plate 62 away from the battery module 20, some electronic devices can be integrated and installed on the base plate 61, improving the ability to integrate electronic devices on the spacer 60. By first integrating and installing the electronic devices on the base plate 61 and the upright plate 62, and then fixing the whole assembly to the base 11, the assembly difficulty can be effectively reduced.

[0090] In some embodiments, the battery pack 3 includes a plurality of battery management units 30, which are spaced apart on the side of the upright plate 62 opposite to the battery module 20. In the first direction L, each battery module 20 is provided with a corresponding battery management unit 30, so that each battery module 20 can be monitored.

[0091] In some embodiments, the module structure 8 further includes a first wire 71 and a second wire 72. The first wire 71 is connected to the positive terminal interface 5 and the positive terminal connector 22 of the battery module 20, and the second wire 72 is connected to the negative terminal interface 6 and the negative terminal connector 23 of the battery module 20. This allows adjacent battery packs 3 to be easily connected in series or in parallel through the positive terminal interface 5 and the negative terminal interface 6.

[0092] In some embodiments, the positive terminal 22 and negative terminal 23 of the battery module 20 are located at both ends of the battery module 20 in the width direction of the battery pack 3. That is, the distance between the positive terminal 22 and negative terminal 23 of the battery module 20 is approximately the same as the dimension of all battery modules 20 in the width direction of the battery pack 3. To facilitate the connection between battery packs 3, the distance between the positive external interface 5 and the negative external interface 6 is usually relatively close. Therefore, at least one of the first wire 71 and the second wire 72 needs to span a relatively long path within the battery pack 3. Therefore, how to reasonably design and arrange the first wire 71 or the second wire 72 that spans a relatively long path is also extremely important.

[0093] In some implementations, the positive external interface 5 and the negative external interface 6 are located at one end of the front wall 121 near the positive terminal 22 of the battery pack 3, so that the second wire 72 connecting the negative terminal 23 of the battery module 20 and the negative external interface 6 needs to be located within the battery pack 3 over a relatively long path.

[0094] In some embodiments, the first conductor 71 and the second conductor 72 are both located inside the power distribution compartment 102. Due to the heat insulation effect of the insulating member 60 on the power distribution compartment 102 and the battery compartment 101, the risk of electrical arcing caused by condensation on the first conductor 71 and the second conductor 72 can be effectively reduced.

[0095] In some embodiments, both the first wire 71 and the second wire 72 are disposed on the separator 60. The component can be isolated from the battery module 20 by the separator 60, and the assembly difficulty can be reduced by first integrating and installing it on the separator 60 and then installing it as a whole on the base 11.

[0096] In some embodiments, the first wire 71 is mounted on the upright plate 62. Since the upright plate 62 faces the front wall 121, the first wire 71 can be easily connected to the positive electrode external interface 5.

[0097] In some embodiments, the second conductor 72 includes a first portion 721 extending along the width direction of the battery pack 3 and a second portion 722 extending from the end of the first portion 721 along the height direction of the battery pack 3. The first portion 721 is disposed on the base plate 61, and the second portion 722 is disposed on the upright plate 62. In this embodiment, the first portion 721 of the second conductor 72 is disposed on the base plate 61, and the length direction of the base plate 61 is the width direction of the battery pack 3, which is also the extension direction of the first portion 721. This allows the first portion 721, which has a longer span, to be reasonably disposed on the base plate 61. The second portion 722 is connected to the end of the first portion 721, and the extension direction of the second portion 722 is along the height direction of the battery pack 3. This allows the second portion 722 to extend to the negative terminal 23 of the battery module 20 for connection. By placing the second conductor 72 on the base plate 61 and the upright plate 62, this design can rationalize the wiring of the long second conductor 72 and effectively prevent electrical arcing between the second conductor 72 and other electronic components.

[0098] In some embodiments, both the first conductor 71 and the second conductor 72 are copper busbars. It is understood that the first conductor 71 and the second conductor 72 can be either rigid copper busbars or flexible copper busbars. Since the first conductor 71 and the second conductor 72 are copper busbars...

[0099] In some embodiments, the upright plate 62 has wire grooves 63 at both ends in the width direction of the battery pack 3. The wire grooves 63 on the base plate 61 have a first portion 721 passing through the wire groove 63 on the base plate 61 and a second portion 722 passing through the wire groove 63 on the upright plate 62. By setting the wire grooves 63, both the first portion 721 and the second portion 722 can be stably set on the separator 60.

[0100] In some embodiments, the module structure 8 also includes a fuse 80, which is connected to the first conductor 71 or the second conductor 72. Thus, in the event of a system failure or a failure of the battery pack 3 itself (such as a short circuit), the fuse 80 can quickly disconnect the circuit, ensuring the safety of the battery pack 3 throughout its entire lifecycle, from manufacturing, transportation, storage, maintenance, and operation.

[0101] In some embodiments, the fuse 80 is located inside the distribution compartment 102. This reduces the risk of condensation and electrical arcing at the fuse 80 due to the separation effect of the isolator 60.

[0102] In some embodiments, the fuse 80 is disposed on the base plate 61 and connected to the first portion 721. Since the second conductor 72 has a long span, it is convenient to connect with the fuse 80. Moreover, since the first portion 721 is disposed on the base plate 61, it is also convenient to place the fuse 80 on the base plate 61 to improve the connection stability of the fuse 80.

[0103] In some embodiments, in the width direction of the battery pack 3, that is, in the length direction of the separator 60, the power board 40 and the fuse 80 are arranged at intervals. Since the fuse 80 and the power board 40 are both large in volume, the space of the power distribution compartment 102 can be reasonably utilized, and the size of the power distribution compartment 102 can be effectively reduced in the first direction L, which is conducive to the miniaturization of the battery pack 3.

[0104] It is understood that in some other embodiments, the fuse 80 may also be located outside the battery pack 3, on the wire connecting the adjacent battery pack 3. Similarly, in the event of a system failure or a failure of the battery pack 3 itself (such as a short circuit), the fuse 80 can achieve rapid disconnection.

[0105] Figure 8 is a structural schematic diagram of the battery management unit 30 of the battery pack 3 in the embodiment of Figure 2; Figure 9 is an exploded schematic diagram of the battery management unit 30 in Figure 8.

[0106] Referring to Figures 8 and 9, in some embodiments, the battery management unit 30 includes a bottom shell 32, a cover 33, and a sampling plate 34. The cover 33 is snap-fitted to the bottom shell 32 and forms a receiving cavity 35, within which the sampling plate 34 is located. In this embodiment, the snap-fit ​​connection between the bottom shell 32 and the cover 33 improves the ease of connection. The sampling plate 34 is positioned within the receiving cavity 35 formed by the bottom shell 32 and the cover 33, thus providing better protection for the sampling plate 34 and preventing short circuits between it and other electronic components, such as wires.

[0107] In some embodiments, the periphery of the bottom shell 32 is provided with a buckle 321, and the periphery of the cover 33 is provided with a slot 331. The bottom shell 32 and the cover 33 are connected together by the buckle 321 and the slot 331.

[0108] In some embodiments, both the bottom shell 32 and the cover 33 are made of non-conductive material to avoid short circuits with the sampling plate 34.

[0109] Referring to Figures 6, 8, and 9, in some embodiments, the bottom shell 32 is disposed within the assembly groove 621, and the cover 33 is snapped into the spacer 60 via a snap-fit ​​connection 321. The snap-fit ​​connection between the cover 33 and the spacer 60, with the bottom shell 32 disposed within the assembly groove 621, ensures that the bottom shell 32 and the sampling plate 34 located within the receiving cavity 35 are stably connected to the spacer 60.

[0110] Specifically, the engaging part 31 is provided on the cover 33 so as to engage with the mating part 65 on the isolation member 60.

[0111] It is understood that in some other embodiments, the bottom shell 32 and the spacer 60 can be connected by a snap-fit ​​mechanism, for example, by providing a snap-fit ​​part 31 on the bottom shell 32 to engage with the mating part 65 on the spacer 60. Alternatively, the bottom shell 32 and the cover 33 can be connected by a snap-fit ​​mechanism, but the bottom shell 32 or the cover 33 is fixedly connected to the spacer 60 by bolts or screws. Finally, the bottom shell 32 and the cover 33 can be fixedly connected by bolts or screws, but the bottom shell 32 or the cover 33 is connected to the spacer 60 by a snap-fit ​​mechanism.

[0112] It is understandable that in some other embodiments, the sampling plate 34 can be directly fixed to the separator 60, for example, placed in the assembly slot 621 of the separator 60, and then connected to the separator 60 by the cover 33, and the assembly slot 621 is sealed to house the sampling plate 34. This eliminates the need for the bottom shell 32, reducing costs and saving space, which is beneficial for the miniaturization of the battery pack 3.

[0113] Figure 10 is a magnified view of part A in Figure 3.

[0114] Referring to Figures 3 and 10, in some embodiments, the battery pack 3 further includes a first connection terminal 51 connected to the flexible circuit board, and the battery management unit 30 further includes a second connection terminal 36 connected to the sampling board 34. The first connection terminal 51 and the second connection terminal 36 are connected to achieve an electrical connection between the flexible circuit board 50 and the sampling board 34. Moreover, the method of connecting the flexible circuit board 50 and the sampling board 34 through the first connection terminal 51 and the second connection terminal 36 can effectively reduce the connection difficulty and improve the connection efficiency.

[0115] In some embodiments, the flexible circuit board 50 is located between the battery module 20 and the top wall 124 of the housing 10 to facilitate electrical connection with the battery cells 21 of the battery module 20. The flexible circuit board extends along the first direction L to facilitate convenient electrical connection with all the battery cells 21 of the battery module 20.

[0116] In some embodiments, the first connection terminal 51 is connected to the end of the flexible circuit board 50 facing the isolator 60, and the second connection terminal 36 is connected to the end of the sampling plate 34 facing the top wall 124 of the housing 10, thereby facilitating the reduction of the distance between the first connection terminal 51 and the second connection terminal 36, so as to facilitate the connection between the first connection terminal 51 and the second connection terminal 36.

[0117] Specifically, the flexible circuit board 50 extends beyond the upright plate 62 in the first direction L, and the first connection terminal 51 is connected to the portion of the flexible circuit board 50 that extends beyond the upright plate 62 in the first direction L. The battery management unit 30 corresponds to the flexible circuit board 50 in the height direction of the battery pack 3, which facilitates the connection of the first connection terminal 51 and the second connection terminal 36, and does not require the flexible circuit board 50 to extend too far beyond the upright plate 62 in the first direction L.

[0118] It is understandable that when there are multiple battery modules 20, there are also multiple flexible circuit boards 50 and battery management units 30. Each flexible circuit board 50 corresponds to a battery management unit 30 disposed on the separator 60 in the height direction of the battery pack 3.

[0119] Figure 11 is a magnified view of part B in Figure 3.

[0120] Referring to Figures 2 and 11, in some embodiments, a gap is provided between the spacer 60 and the top wall 124 of the housing 10, so that some structures can extend into the area between the spacer 60 and the top wall 124 during assembly, thereby improving the space utilization within the housing 10 and facilitating the miniaturization of the battery pack 3. For example, the busbar 7 connected to the battery module 20, the positive terminal connector 22 and the negative terminal connector 23 of the battery module 20 can all be located in the area between the spacer 60 and the top wall 124 of the housing 10, and the flexible circuit board 50 can also pass through the area between the spacer 60 and the top wall 124 of the housing 10 to connect with the battery management unit 30.

[0121] When the battery pack 3 experiences thermal runaway, a small amount of electrolyte still sprays from the gap between the separator 60 and the top wall 124 of the outer casing 10 onto the power board 40, battery management unit 30, copper busbar, etc., thus still posing a risk of electrical arcing to the power board 40, battery management unit 30, copper busbar, etc. To prevent electrical arcing of the power board 40, battery management unit 30, copper busbar, etc. due to electrolyte spraying onto the power distribution compartment 102, in some embodiments, the battery pack 3 further includes a foam strip 90 disposed between the battery module 20 and the top wall 124 of the outer casing 10, so as to fill the area between the separator 60 and the top wall 124 of the outer casing 10 with the foam strip 90, thereby substantially and completely preventing the electrolyte sprayed from the battery cell 21 of the battery module 20 from spraying onto the power distribution compartment 102, thereby preventing electrical arcing of electronic components (power board 40, battery management unit 30, copper busbar, etc.) located in the power distribution compartment 102.

[0122] In some embodiments, the foam strip 90 is disposed between the battery module 20 and the top wall 124 of the outer casing 10, and in the height direction of the battery module 20, the foam strip 90 substantially corresponds to the position of the separator 60 or the end plate 25 of the battery module 20. This allows the foam strip 90 to effectively isolate the electrolyte ejected from the battery cell 21 of the battery module 20 from spraying onto the power distribution compartment 102.

[0123] In some embodiments, the foam strip 90 is elongated, and the extension direction of the foam strip 90 is the same as the extension direction of the spacer 60.

[0124] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, The battery pack includes a housing and an isolator, a battery module, and a battery management unit built into the housing. The battery management unit is disposed on the isolator, which is fixed inside the housing and divides the space inside the housing into a battery compartment and a power distribution compartment distributed along a first direction. The battery management unit is located in the power distribution compartment, the battery module is located in the battery compartment, and the battery management unit is electrically connected to the battery module.

2. The battery pack according to claim 1, characterized in that, The isolation component includes a base plate and an upright plate integrally formed with the base plate. The upright plate divides the space inside the housing to form the battery compartment and the power distribution compartment. The base plate is fixed to the base of the housing and is located on the side of the upright plate away from the battery module. The battery management unit is assembled on the side of the upright plate away from the battery module.

3. The battery pack according to claim 1, characterized in that, The isolation component has an assembly slot on the side opposite to the battery module, and the battery management unit is installed in the assembly slot.

4. The battery pack according to claim 3, characterized in that, The battery management unit includes a bottom shell, a cover, and a sampling plate. The cover is snap-fitted to the bottom shell and forms a receiving cavity, and the sampling plate is located inside the receiving cavity. The bottom shell is disposed in the assembly slot, and the cover is snap-fitted to the separator.

5. The battery pack according to claim 4, characterized in that, The battery pack also includes a flexible circuit board and a first connection terminal. The flexible circuit board is located between the battery module and the top wall of the housing and is electrically connected to the battery cell of the battery module. The flexible circuit board extends along the first direction, and a portion of the flexible circuit board extends into the power distribution compartment. The first connection terminal is connected to the portion of the flexible circuit board that extends into the power distribution compartment. The battery management unit also includes a second connection terminal connected to the sampling board, and the first connection terminal and the second connection terminal are connected.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes a positive external interface and a negative external interface. The battery pack also includes a first wire for connecting the positive external interface and the positive terminal of the battery module, and a second wire for connecting the negative external interface and the negative terminal of the battery module. The first wire and the second wire are disposed on the insulating member and located inside the power distribution compartment.

7. The battery pack according to claim 6, characterized in that, The isolation component includes a base plate and an upright plate integrally formed with the base plate. The upright plate divides the space inside the housing to form the battery compartment and the power distribution compartment. The base plate is fixed to the base of the housing and is located on the side of the upright plate away from the battery module. The second conductor includes a first portion extending along the width direction of the battery pack and a second portion extending from the end of the first portion along the height direction of the battery pack. The first portion is disposed on the base plate and the second portion is disposed on the upright plate.

8. The battery pack according to claim 7, characterized in that, The upright plate has grooves at both ends in the width direction of the battery pack, and the bottom plate has grooves, with the first part passing through the grooves on the bottom plate and the second part passing through the grooves on the upright plate.

9. The battery pack according to claim 6, characterized in that, The battery pack also includes a fuse disposed on the separator, the fuse being connected to the first conductor or the second conductor.

10. The battery pack according to claim 1, characterized in that, The battery pack also includes a power board for controlling the battery module, and the power board is located in the power distribution compartment.

11. The battery pack according to claim 10, characterized in that, The housing includes a front wall and a rear wall opposite each other in the first direction, the separator is located between the battery module and the front wall, and the power board is disposed on the side of the front wall facing the separator.

12. The battery pack according to claim 1, characterized in that, The battery module includes a plurality of battery cells arranged along the first direction, the separator is elongated and extends along the width direction of the battery pack, and the first direction is consistent with the length direction of the battery pack.

13. The battery pack according to claim 1, characterized in that, In the width direction of the battery pack, the two ends of the separator protrude beyond the two ends of the battery module.

14. The battery pack according to claim 1, characterized in that, A gap is left between the separator and the top wall of the housing. The battery pack also includes a foam strip. In the height direction of the battery pack, the foam strip is disposed in the gap area between the top wall of the housing and the separator. The height direction of the battery pack is perpendicular to the first direction.

15. An energy storage device, characterized in that, It includes a cabinet and a plurality of battery packs as described in any one of claims 1-14, wherein the plurality of battery packs are stacked within the cabinet.

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