Battery pack and energy storage device

Abstract

The embodiment of the utility model provides a battery pack and an energy storage device, the battery pack comprises a shell, and a separator, a battery module and a battery management unit which are arranged in the shell, the battery management unit is arranged on the separator, the separator is fixed in the shell and divides the space in the shell into a battery cabin and a power distribution cabin which are distributed along a first direction, and the battery cabin and the power distribution cabin are arranged in the shell. The battery management unit is located in the power distribution cabin, the battery module is located in the battery cabin, and the battery management unit is electrically connected with the battery module. The battery compartment and the power distribution compartment can be separated, condensation caused by moisture streaming is inhibited, baking of a single plate on the battery compartment is reduced, and the temperature consistency of batteries at the end of the module is improved. By designing the subdivision partition plate structure, the subdivision partition plate has an integrated BMU installation function, fast installation is achieved in a clamping mode, assembly pretreatment can be conducted on branch lines in the production process, then an assembly is installed in a PACK, and the assembly and replacement efficiency can be improved.

Description

Technical Field

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

[0002] The battery pack, electronic devices such as the battery management unit, and the battery module in the related art are all assembled in the outer shell of the battery pack. Since most of the space in the outer shell is occupied by the battery module, the space in the outer shell for installing electronic devices such as the battery management unit is small, which makes it difficult to assemble electronic devices such as the battery management unit, and the position layout of electronic devices such as the battery management unit is difficult to rationalize. Since the position layout of electronic devices is difficult to rationalize, when the battery pack is working, the battery cells of the battery module close to the battery management unit have a higher temperature than the battery cells in other positions due to the baking effect of the battery management unit on the adjacent battery cells, resulting in a decrease in the temperature consistency of the battery cells in the battery pack. Utility Model Content

[0003] Embodiments of the present application provide a battery pack and an energy storage device to solve the problem of low temperature consistency of battery cells in the battery pack.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, comprising a shell and an isolating member, a battery module and a battery management unit built into the shell, wherein the battery management unit is disposed on the isolating member, the isolating member is fixed in the shell, and divides the space in the shell into a battery compartment and a distribution compartment distributed along a first direction, the battery management unit is located in the distribution compartment, the battery module is located in the battery compartment, and the battery management unit is electrically connected to the battery module.

[0005] In this embodiment, the electronic components such as the battery management unit can be first installed on the separator to form an integrated module structure, and then the module structure is fixed to the shell as a whole, so that the difficulty of assembly can be effectively reduced and the convenience of assembly can be improved. Moreover, since the battery management unit and the separator can be assembled outside the shell first, the position layout of the battery management unit is easier, so that the position layout of the electronic components such as the battery management unit is more reasonable. In this embodiment, through the reasonable layout of the positions of the separator and the battery management unit, the separator assembles the battery module and the battery management unit in compartments, so that the heat of the battery management unit when working can be effectively reduced on the battery module. Reduce the baking of the battery management unit and the like on the battery cells of the battery modules adjacent to it, and improve the temperature consistency of each battery cell of the battery module. In addition, since the battery compartment and the distribution compartment are separated by the separator, even if the battery module in the battery compartment produces condensation due to the large heat capacity, the condensation can be effectively prevented from flowing to the distribution compartment, so that the risk of electrical ignition caused by the battery management unit in the distribution compartment contacting the condensation can be effectively reduced. Moreover, by setting up the isolator, the heat transfer between the battery compartment and the power distribution compartment can be effectively blocked. Therefore, the temperature in the power distribution compartment will not lag behind the temperature in the battery compartment, and will not form a temperature difference with the surrounding temperature, thereby reducing the risk of condensation in the battery management unit in the power distribution compartment. In addition, when the battery cell of the battery module sprays electrolyte due to thermal runaway, the setting of the isolator can effectively block the electrolyte from spraying onto the battery management unit, thereby effectively reducing the risk of electrical ignition of the battery management unit.

[0006] In some embodiments, the isolation member includes a bottom plate and a vertical plate integrally formed with the bottom plate, the vertical plate divides the space in the outer shell into a battery compartment and a distribution compartment, the bottom plate is fixed to the base of the outer shell, the bottom plate is located on the side of the vertical plate away from the battery module, and the battery management unit is assembled on the side of the vertical plate away from the battery module. In this embodiment, the electronic components can be integrated and installed on the bottom plate and the vertical plate to form an integrated module structure, and then the module structure can be fixed to the outer shell as a whole, thereby effectively reducing the difficulty of assembly and improving the convenience of assembly. In addition, since the bottom plate is located on the side of the vertical plate away from the battery module, some electronic components can be integrated and installed on the bottom plate, thereby improving the ability to integrate electronic components on the isolation member.

[0007] In some embodiments, a mounting groove is provided on the side of the isolating member facing away from the battery module, and the battery management unit is installed in the mounting groove. In this embodiment, by providing the mounting groove on the vertical plate, an installation position can be reserved for the assembly of the battery management unit, thereby facilitating integrated design. Moreover, by installing the battery management unit in the mounting groove, the stability of the connection between the battery management unit and the isolating member can be effectively ensured.

[0008] In some embodiments, the battery management unit includes a bottom shell, a cover body and a sampling plate. The cover body is snap-connected to the bottom shell to form a receiving cavity, and the sampling plate is located in the receiving cavity. The bottom shell is arranged in the assembly groove, and the cover body is snap-connected to the isolation member. In this embodiment, since the bottom shell and the cover body are snap-connected, the connection convenience between the bottom shell and the cover body can be improved. The sampling plate is arranged in the receiving cavity surrounded by the bottom shell and the cover body, so as to improve the reasonable protection of the sampling plate to prevent the sampling plate from being short-circuited with other electronic devices, such as wires.

[0009] 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 housing and is electrically connected to the battery cells of the battery module. The flexible circuit board extends along a 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 extending into the power distribution compartment. The battery management unit further includes a second connection terminal connected to the sampling board, and the first connection terminal is connected to the second connection terminal. In this embodiment, since the flexible circuit board is located between the battery module and the top wall of the housing, so as to facilitate electrical connection with the battery cells of the battery module, the flexible circuit board extends along the first direction to facilitate convenient electrical connection with all the battery cells of the battery module. Moreover, the method of connecting the flexible circuit board and the sampling board through the first connection terminal and the second connection terminal can effectively reduce the difficulty of connection and improve the connection efficiency.

[0010] In some embodiments, the battery pack further includes a positive external interface and a negative external interface, and the battery pack further 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, and the first wire and the second wire are arranged on the isolating member and located in the power distribution cabin. In this embodiment, the first wire and the second wire are both arranged in the power distribution cabin, and due to the heat insulation effect of the isolating member on the power distribution cabin and the battery cabin, the risk of condensation on the first wire and the second wire and electrical ignition can be effectively reduced.

[0011] In some embodiments, the isolating member includes a bottom plate and a vertical plate integrally formed with the bottom plate, the vertical plate separates the space in the housing to form a battery compartment and a distribution compartment, the bottom plate is fixed to the base of the housing, the bottom plate is located on the side of the vertical plate away from the battery module, the second wire includes a first part extending along the width direction of the battery pack and a second part extending from the end of the first part along the height direction of the battery pack, the first part is arranged on the bottom plate, and the second part is arranged on the vertical plate. In this embodiment, the first part of the second wire is arranged on the bottom plate, and the length direction of the bottom plate is the width direction of the battery pack, which is also the extension direction of the first part, so that the first part with a longer span can be reasonably arranged on the bottom plate. The second part is connected to the end of the first part, and the extension direction of the second part is along the height direction of the battery pack, so that it can extend to the negative terminal of the battery module through the second part to connect with the negative terminal of the battery module. Such a design can rationalize the wiring of the second wire with a longer length.

[0012] In some embodiments, both ends of the vertical plate in the width direction of the battery pack are provided with wire grooves, and the bottom plate is provided with a wire groove, the first part passes through the wire groove on the bottom plate, and the second part passes through the wire groove on the vertical plate. In this embodiment, through the provision of the wire groove, the first part and the second part can be stably arranged on the isolation member, which is also conducive to the integrated design of the second wire and the isolation member.

[0013] In some embodiments, the battery pack further includes a fuse disposed on the isolator, and the fuse is connected to the first wire or the second wire. In this embodiment, since the fuse is connected to the first wire or the second wire, in the event of a system failure or a battery pack failure (such as a short circuit), the fuse can be quickly disconnected to ensure the safety of the battery pack throughout its life cycle, including manufacturing, transportation, storage, maintenance, and operation.

[0014] In some embodiments, the battery pack also includes a power board for controlling the battery module, and the power board is arranged in the power distribution compartment. In this embodiment, the battery module and the power board are assembled in separate compartments by means of an isolator, which can effectively reduce the effect of the heat generated by the power board during operation on the battery module. The baking of the battery cells of the battery module adjacent to the power board is reduced, and the temperature consistency of each battery cell of the battery module is improved. In addition, when the battery cell of the battery module sprays electrolyte due to thermal runaway, the isolation component can effectively prevent the electrolyte from spraying onto the power board, thereby effectively reducing the risk of electrical ignition of the power board.

[0015] In some embodiments, the housing includes a front wall and a rear wall that are opposite to each other in a first direction, the spacer is located between the battery module and the front wall, and the power board is disposed on a side of the front wall that faces the spacer. In this embodiment, since the power board is disposed on a side of the front wall that faces the spacer, the heat of the power board can be dissipated as much as possible through the front wall. In addition, the isolation of the spacer can further reduce the impact of the heat generated by the power board on the battery module in the battery compartment.

[0016] In some embodiments, the battery module includes a plurality of battery cells arranged along a first direction, the isolating member is in the shape of an elongated strip, the isolating member extends along the width direction of the battery pack, and the first direction is consistent with the length direction of the battery pack. In this embodiment, since the arrangement direction of the plurality of battery cells of the battery module is the first direction, and the length direction is the same as the width direction of the battery pack, the installation position of the battery management unit is located at the end side of the arrangement direction of the plurality of battery cells of the battery module, so that the position of the battery management unit can be flexibly and conveniently adjusted, and the design optimization and iterative evolution of the battery module can be supported in the first direction. In addition, since the isolating member is in the shape of an elongated strip, and the isolating member extends along the width direction of the battery pack, while isolating as many battery modules, power boards and battery management units as possible, it is possible to avoid the isolating member occupying a larger space in the first direction.

[0017] In some embodiments, in the width direction of the battery pack, the two ends of the isolating member protrude from the two ends of the battery module. In this embodiment, since the two ends of the isolating member in the extension direction protrude from the two ends of the battery module in the width direction of the battery pack, 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 isolating member, so as to reduce the impact of the heating of 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, so as to prevent the generation of condensation in the power distribution compartment.

[0018] In some embodiments, a space is left between the isolating member and the top wall of the housing, and the battery pack further comprises a foam strip, which is arranged in the spaced area between the top wall of the housing and the isolating member 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 strip is arranged between the battery module and the top wall of the housing, it can effectively prevent the electrolyte sprayed from the battery cell of the battery module from spraying toward the power distribution compartment, thereby preventing the electronic devices (power boards, battery management units, copper busbars, etc.) located in the power distribution compartment from electrical ignition.

[0019] In a second aspect, an embodiment of the present application provides an energy storage device, comprising a cabinet and a plurality of battery packs as described in any one of the first aspects above, wherein the plurality of battery packs are stacked in the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0021] Figure 1 A simple structural schematic diagram of an energy storage device provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0023] Figure 3 for Figure 2 A schematic diagram of a portion of the structure of a battery pack in an embodiment with part of the housing hidden;

[0024] Figure 4 for Figure 2 A schematic diagram of a battery pack in an embodiment with some structures hidden;

[0025] Figure 5 for Figure 2 Schematic diagram of the installation position of the power board of the battery pack;

[0026] Figure 6 for Figure 2 A schematic diagram of the structure of the isolation member of the battery pack;

[0027] Figure 7 for Figure 2 A schematic diagram of the assembly structure of the isolation member of the battery pack and the battery management unit;

[0028] Figure 8 for Figure 2 A schematic structural diagram of a battery management unit of a battery pack in an embodiment;

[0029] Fig. 9 for Figure 8 An exploded schematic diagram of the battery management unit in FIG.

[0030] Fig.10 for Figure 3 A local enlarged schematic diagram of the middle A;

[0031] Fig.11 for Figure 3 A local enlarged schematic diagram of point B in the middle. Description of the drawings:

[0033] L, first direction; X, length direction of the battery pack; Y, length direction of the battery pack; Z, length direction of the battery pack;

[0034] 1. Energy storage device; 2. Cabinet; 3. Battery pack; 4. Signal interface; 5. Positive external interface; 6. Negative external interface; 7. Bus; 8. Module structure;

[0035] 10. Shell; 101. Battery compartment; 102. Power distribution compartment; 11. Base; 12. Shell; 121. Front wall; 1211. Heat dissipation fins; 122. Rear wall; 123. Side wall; 124. Top wall;

[0036] 20. Battery module; 21. Battery cell; 22. Positive terminal; 23. Negative terminal; 24. Cable tie; 25. End plate;

[0037] 30. Battery management unit; 31. Clamping part; 32. Bottom shell; 321. Buckle; 33. Cover; 331. Card slot; 34. Sampling plate; 35. Accommodating cavity; 36. Second connecting terminal;

[0038] 40. Power board; 41. Installation cavity; 42. Cover plate;

[0039] 50. Flexible circuit board; 51. First connecting terminal;

[0040] 60, spacer; 61, bottom plate; 62, vertical plate; 621, assembly slot; 622, wire harness fixing card; 63, wire slot; 64, mounting slot; 65, mating portion; 66, fixing hole;

[0041] 71, first conductor; 72, second conductor; 721, first portion; 722, second portion;

[0042] 80. Fuse;

[0043] 90. Foam strips. DETAILED DESCRIPTION

[0044] The following first explains some terms involved in the embodiments of the present application.

[0045] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] In this specification, the terms "perpendicular", "parallel", etc. are explained.

[0047] Vertical: The verticality defined in this application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by 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.

[0048] Parallelism: The parallelism defined in this 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 caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. These situations will lead to the sliding fitting part and the first door panel not being absolutely parallel, but this application also defines this situation as parallelism.

[0049] Figure 1 A simple structural schematic diagram of an energy storage device 1 provided in an embodiment of the present application.

[0050] Reference Figure 1 The energy storage device 1 includes a cabinet 2 and a plurality of battery packs 3 disposed in the cabinet 2. The plurality of battery packs 3 are stacked in the cabinet 2. The plurality of battery packs 3 can store or output electrical energy.

[0051] To facilitate understanding of the energy storage device 1 provided in the embodiment of the present application, its application scenario is introduced 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 a backup power supply in daily family living environments, industrial and commercial parks, large ground power supply stations, or photovoltaic storage systems. The application of the energy storage device 1 is briefly explained using the photovoltaic storage system scenario as an example. The photovoltaic storage system generally includes photovoltaic modules, energy storage converters, energy storage devices 1, and grid-connected inverters. Among them, photovoltaic modules can convert light energy into electrical energy in the form of direct current and output it to the grid-connected inverter; the grid-connected inverter can convert electrical energy in the form of direct current into electrical energy in the form of alternating current, and transmit the electrical energy in the form of alternating current to the power grid, thereby realizing the grid connection of the photovoltaic storage system.

[0052] Figure 2 A schematic diagram of the structure of a battery pack 3 provided in an embodiment of the present application; Figure 3 for Figure 2 The schematic diagram of the partial structure of the battery pack 3 in the embodiment is a diagram in which a part of the housing 12 is hidden. Figure 2 The battery pack 3 in the embodiment can be used not only Figure 1 The energy storage device 1 in the embodiment can also be applied to the vehicle field or other fields that require the use of a battery pack 3 .

[0053] Reference Figure 2 and Figure 3The battery pack 3 includes a housing 10, a battery module 20, a battery management unit 30 and a power board 40 (such as Figure 5 ).

[0054] In some embodiments, the housing 10 includes a base 11 and a shell 12 connected to the base 11 . The shell 12 can be used to accommodate the battery module 20 after being connected to the base 11 .

[0055] The housing 12 includes a front wall 121 and a rear wall 122 opposite to each other in the length direction Z of the battery pack 3, two side walls 123 opposite to 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 receive the battery module 20, the battery management unit 30, and the power board 40.

[0056] The base 11 includes a bottom plate 61 and side plates connected to the periphery of the bottom plate 61 . The side plates and the bottom plate 61 are combined to form a limiting storage groove, and the battery module 20 is assembled into the limiting storage groove.

[0057] In some embodiments, there are multiple battery modules 20 , and the multiple battery modules 20 are arranged side by side in the housing 10 .

[0058] The battery module 20 includes a plurality of arranged battery cells 21 and end plates 25 (such as Fig.11 ) and a cable tie 24, 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 bundled together by the end plates 25 and the cable tie 24 at both ends to facilitate transportation and reduce the gap between adjacent battery cells 21 to improve energy density.

[0059] In some implementations, the pressure relief valves of the plurality of battery cells 21 are all facing the top wall 124 .

[0060] In some embodiments, the battery management unit 30 (BMU) is used to monitor the operating status of the battery to ensure safe and stable operation of the battery. For example, the battery management unit 30 monitors the voltage, current, temperature and other key parameters of the battery cell 21 of the battery module 20 to detect abnormal conditions in a timely manner and ensure safe operation of the battery.

[0061] In some embodiments, the battery pack 3 also includes a flexible circuit board 50 (Flexible Printed Circuit, FPC), which is electrically connected between the multiple battery cells 21 of the battery module 20 and the battery management unit 30. The flexible circuit board 50 is used to measure the operating status of the multiple battery cells 21 of the battery module 20 and feed back to the battery management unit 30, such as transmitting the measured key parameters such as voltage, current, and temperature of the multiple battery cells 21 to the battery management unit 30.

[0062] 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 corresponding flexible circuit board 50 . The flexible circuit board 50 can be connected to all the battery cells 21 of the battery module 20 to detect the status of all the battery cells 21 of the battery module 20 .

[0063] Similarly, one flexible circuit board 50 can be connected to only one battery management unit 30, and one 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 provided with multiple battery management units 30 and multiple flexible circuit boards 50 accordingly.

[0064] In some implementations, the flexible circuit board 50 is disposed between the top wall 124 and the battery modules 20 .

[0065] In some implementations, the power board 40 is used to control the battery module 20 , for example, to be responsible for active balancing and power conversion of the battery module 20 , so as to perform charge and discharge management and ensure safe and efficient operation of the battery module 20 .

[0066] In some embodiments, the battery pack 3 also includes a signal interface 4, which is disposed 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 facilitate transmitting the signals received by the battery management unit 30 and the power board 40 of the battery pack 3 to the outside, or receiving external signals.

[0067] Figure 4 for Figure 2 A partial structural diagram of the battery pack 3 in the embodiment with some structures hidden.

[0068] Reference Figure 2-Figure 4In some embodiments, the battery pack 3 further includes an isolating member 60, and the battery management unit 30 and the isolating member 60 are assembled into an integrated module structure 8, and the module structure 8 is disposed in the housing 10. In this embodiment, the electronic components such as the battery management unit 30 can be integrated and installed on the isolating member 60 to form an integrated module structure 8, and then the module structure 8 can be fixed to the housing 10 as a whole, thereby effectively reducing the difficulty of assembly and improving the convenience of assembly. Since the battery management unit 30 and the isolating member 60 can be assembled outside the housing 10 first, the position layout of the battery management unit 30 is easier, and thus the position layout of the electronic components such as the battery management unit 30 is more reasonable. By rationally arranging the positions of the isolating member 60 and the battery management unit 30, etc., the isolating member 60 can assemble the battery module 20 and the battery management unit 30 in compartments.

[0069] In some embodiments, the isolating member 60 separates the housing 10 into a battery compartment 101 and a power distribution compartment 102 distributed along the first direction L. The battery compartment 101 is mainly used to place the battery module 20, and the power distribution compartment 102 is mainly used to place electronic devices such as the battery management unit 30 and the power board 40. In this embodiment, the battery module 20, the power board 40 and the battery management unit 30 are assembled in compartments by the isolating member 60, which can effectively reduce the influence of the heat of the battery management unit 30 and the power board 40 on the battery module 20 during operation. Reduce the baking of the battery cells 21 of the battery module 20 adjacent to the power board 40 and the battery management unit 30, and improve the temperature consistency of each battery cell 21 of the battery module 20. In addition, since the battery compartment 101 and the power distribution compartment 102 are separated by the isolation member 60, even if the battery module 20 in the battery compartment 101 generates condensation due to its large heat capacity, the condensation can be effectively prevented from flowing to the power distribution compartment 102, thereby effectively preventing the electronic devices in the power distribution compartment 102 (such as the battery management unit, the power board 40 or the connecting wires, etc.) from contacting the condensation and causing electrical ignition. Moreover, by providing the isolation member 60, the heat transfer between the battery compartment 101 and the power distribution compartment 102 can be effectively blocked. Therefore, the temperature in the power distribution compartment 102 will not lag behind the temperature change in the power distribution compartment 102 under the influence of the relatively small temperature in the battery compartment 101, and will not form a temperature difference with the surrounding temperature, thereby reducing the risk of condensation in the electronic devices in the power distribution compartment 102. In addition, when the battery cell 21 of the battery module 20 experiences thermal runaway and sprays electrolyte, the setting of the isolation member 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 ignition of the power board 40 or the battery management unit 30.

[0070] The isolation member 60 is made of an insulating material, so that the creepage distance between the battery module 20 and the electronic devices arranged in the power distribution compartment 102 can be increased through the separation of the isolation member 60, and the electrical spark between the battery cell 21 of the battery module 20 and the electronic devices can be effectively prevented.

[0071] The isolator 60 is made of a material with low thermal conductivity. Since the isolator 60 is made of a material with low thermal conductivity, the isolator 60 can effectively block the heat transfer between the power distribution compartment 102 and the battery compartment 101, and effectively block the heat transfer from the battery management unit 30 and the power board 40 to the battery module 20, thereby effectively reducing the baking effect of the battery management unit 30 and the power board 40 on the battery module 20 when they are working and generating heat.

[0072] In some implementations, the thermal conductivity of the isolation member 60 is less than 0.3 W / (m*K). For example, the isolation member 60 may be made of engineering plastics such as PC, ABS, and PA.

[0073] It is understandable that in some other embodiments, the isolation member 60 may also be made of a heat-insulating material with low thermal conductivity coated on the surface of a metal material. This can not only ensure insulation, heat insulation and other functions, but also effectively improve the supporting strength of the isolation member 60.

[0074] In some embodiments, the first direction L is consistent with the length direction Z of the battery pack 3. The isolating member 60 is in the shape of an elongated strip, and the extension direction of the isolating member 60 is the width direction of the battery pack 3, that is, the length direction of the isolating member 60 is the width direction of the battery pack 3. It can be understood that the width direction of the battery pack 3, the length direction Z of the battery pack 3 and the height direction of the battery pack 3 are perpendicular to each other. The length direction of the isolating member 60 refers to the extension direction of the isolating member 60 when it is in the shape of an elongated strip. Since the isolating member 60 is in the shape of an elongated strip, and the length direction of the isolating member 60 is the same as the width direction of the battery pack 3, the isolating member 60 can avoid occupying a larger space in the first direction L while isolating as many battery modules 20, power boards 40 and battery management units 30 as possible.

[0075] In some embodiments, the two ends of the isolating member 60 in the extension direction protrude from the two ends of the battery module 20 in the width direction of the battery pack 3. Since the two ends of the isolating member 60 in the extension direction protrude from the two ends of the battery module 20 in the width direction of the battery pack 3, each position of the battery module 20 in the width direction of the battery pack 3 can be effectively separated from the electronic components in the power distribution compartment 102 by the isolating member 60, so as to reduce the influence of the electronic components in the power distribution compartment 102 on the battery module 20 when heating. It can also effectively reduce the heat transfer from the battery compartment 101 to the power distribution compartment 102, so as to prevent the generation of condensation in the power distribution compartment 102.

[0076] In addition, since the installation position of the battery management unit 30 is located at the end side of the battery module 20 in the first direction L, the position can be flexibly and conveniently adjusted and the battery module 20 can be supported in the first direction L for design optimization and iterative evolution.

[0077] In some embodiments, along the width direction of the battery pack 3, both ends of the length of the isolation member 60 basically extend to the two side walls 123 of the shell 12, so that the battery compartment 101 and the distribution compartment 102 are separated as much as possible to reduce the impact of the electronic devices in the distribution compartment 102 on the battery module 20.

[0078] It can be 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 .

[0079] Figure 5 for Figure 2 Schematic diagram of the installation position of the power board 40 of the battery pack 3.

[0080] Reference Figure 2-Figure 5 In some embodiments, the isolating member 60 is located between the battery module 20 and the front wall 121, and the power board 40 is located on the side of the front wall 121 facing the isolating member 60. In this embodiment, in the first direction L, the area between the isolating member 60 and the front wall 121 is the power distribution compartment 102. Since the power board 40 is located on the side of the front wall 121 facing the isolating member 60, the heat of the power board 40 can be dissipated as much as possible through the front wall 121. In addition, the isolation of the isolating member 60 can further reduce the influence of the heat generated by the power board 40 on the battery module 20 in the battery compartment 101.

[0081] In some implementations, the front wall 121 is provided with heat dissipation fins 1211 , and the power board 40 is provided on the front wall 121 , so that the heat dissipation effect of the power board 40 can be further improved by providing the heat dissipation fins 1211 .

[0082] In some embodiments, a mounting cavity 41 and a cover plate 42 for sealing the mounting cavity 41 are provided on the side of the front wall 121 facing the isolation member 60, and the power board 40 is provided in the mounting cavity 41. After the power board 40 is assembled in the mounting cavity 41, the power board 40 can be sealed in the mounting cavity 41 by the cover plate 42. It is understandable that power devices, such as various diodes, triodes, resistors, capacitors or inductors, etc., can be integrated on the power board 40. Since the power board 40 is sealed in the mounting cavity 41, more 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 influence of the power board 40 on other electronic devices in the distribution cabin 102 can also be effectively reduced, such as the mutual influence between the power board 40 and the battery management unit 30 can be effectively reduced.

[0083] Reference Figure 3 and Figure 5 In some embodiments, the battery pack 3 further includes a positive external interface 5 and a negative external interface 6 provided 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 an external interface connected 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, and the top wall 124, the base 11, etc. of the battery pack 3 are used to abut against the base 11, the top wall 124, etc. of other battery packs 3. Therefore, arranging the positive external interface 5 and the negative external interface 6 on the front wall 121 can facilitate the connection between the multiple battery packs 3. Furthermore, electronic components such as the power board 40 and the battery management unit 30 are arranged in the power distribution compartment 102 between the isolation piece 60 and the front wall 121 . Since the front wall 121 is exposed, the heat dissipation efficiency can be improved through the front wall 121 .

[0084] Figure 6 for Figure 2 Schematic diagram of the structure of the isolation member 60 of the battery pack 3.

[0085] Reference Figure 6 In some embodiments, the isolation member 60 includes a bottom plate 61 and a vertical plate 62 integrally formed with the bottom plate 61 . The vertical plate 62 and the bottom plate 61 are both in the shape of long strips, and the vertical plate 62 and the bottom plate 61 have the same length direction.

[0086] A mounting groove 621 is provided on one side of the vertical plate 62, and the mounting groove 621 is used to install the battery management unit 30. It is understandable that the number of the mounting grooves 621 can be multiple, so as to assemble multiple battery management units 30, and the multiple mounting grooves 621 are arranged at intervals along the length direction of the vertical plate 62.

[0087] A wire harness fixing card 622 is provided on one side of the vertical plate 62 where the assembly groove 621 is provided. The number of the wire harness fixing card 622 can be multiple, and the wire harness fixing card 622 is used to fix and constrain the wires to prevent the wires from being too messy.

[0088] A wire groove 63 for restraining the copper busbar is provided on one side of the vertical plate 62 where the assembly groove 621 is provided.

[0089] In some embodiments, two wire grooves 63 are provided on the vertical plate 62 , and the two wire grooves 63 are located at two ends of the vertical plate 62 in the length direction of the vertical plate 62 .

[0090] In some embodiments, the bottom plate 61 is substantially perpendicular to the vertical plate 62. The bottom plate 61 is used to be fixedly connected to the base 11, for example, the bottom plate 61 and the base 11 can be fixedly connected by bolts or screws. Since the bottom plate 61 and the vertical plate 62 are substantially perpendicular to each other, after the bottom plate 61 and the base 11 are fixed, the vertical plate 62 can be ensured to be in a vertically placed state.

[0091] The bottom plate 61 is also provided with a wire slot 63 for restraining the copper busbar.

[0092] The bottom plate 61 is also provided with a fuse 80 (such as Figure 7 ) mounting groove 64.

[0093] Figure 7 for Figure 2 Schematic diagram of the assembly structure of the isolation member 60 of the battery pack 3 and the battery management unit 30.

[0094] Reference Figure 6 and Figure 7 In some embodiments, the battery management unit 30 is connected to the side of the isolation member 60 away from the battery module 20 by a snap 321. Since the isolation member 60 and the battery management unit 30 are connected by a snap 321, the connection efficiency between the battery management unit 30 and the isolation member 60 can be improved. In addition, since the battery management unit 30 is connected to the isolation member 60, the battery management unit 30 can be first fixed to the isolation member 60, and then the isolation member 60 can be assembled to the housing 10, which can not only improve the assembly efficiency, but also reduce the assembly difficulty.

[0095] In some implementations, the battery management unit 30 is installed in the assembly groove 621. By installing the battery management unit 30 in the assembly groove 621, the stability of the connection between the battery management unit 30 and the isolation member 60 can be effectively ensured.

[0096] In some embodiments, a snap-fitting portion 31 is provided on the battery management unit 30, and a matching portion 65 is provided on the isolation member 60. The matching portion 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 snap-fitting portion 31 is snapped with the matching portion 65. The matching portion 65 can limit the snap-fitting portion 31 to prevent the battery management unit 30 from detaching from the assembly groove 621.

[0097] In some embodiments, the isolating member 60 is further provided with a fixing hole 66, and the battery management unit 30 can also be fixed to the isolating member 60 by connecting the bolts with the fixing holes 66. It is understandable that in some other embodiments, the isolating member 60 and the battery management unit 30 are fixed by both bolts and buckles 321 to improve the stability of the connection between the battery management unit 30 and the isolating member 60.

[0098] In some embodiments, the vertical plate 62 is used to separate the outer shell 10 into a battery compartment 101 and a power distribution compartment 102 adjacent to each other along the first direction L, and the bottom plate 61 is fixed to the base 11 of the outer shell 10, and the bottom plate 61 is located on the side of the vertical plate 62 away from the battery module 20. In this embodiment, the isolation member 60 is fixed to the base 11 through the bottom plate 61, so that the assembly method between the isolation member 60 and the base 11 is more reasonable. Moreover, since the bottom plate 61 is located on the side of the vertical plate 62 away from the battery module 20, some electronic devices can be integrated and installed on the bottom plate 61, thereby improving the ability to integrate electronic devices on the isolation member 60, so that the electronic devices can be integrated and installed on the bottom plate 61 and the vertical plate 62 first, and then fixed to the base 11 as a whole, thereby effectively reducing the difficulty of assembly.

[0099] In some embodiments, the battery pack 3 includes a plurality of battery management units 30, which are arranged at intervals on a side of the vertical plate 62 away from 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.

[0100] In some embodiments, the module structure 8 further includes a first wire 71 and a second wire 72, wherein the first wire 71 is connected to the positive electrode external interface 5 and the positive electrode connector 22 of the battery module 20, and the second wire 72 is connected to the negative electrode external interface 6 and the negative electrode connector 23 of the battery module 20. Thus, it is convenient to realize series or parallel connection between adjacent battery packs 3 through the positive electrode external interface 5 and the negative electrode external interface 6.

[0101] In some embodiments, the positive terminal 22 and the 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 the negative terminal 23 of the battery module 20 is roughly the same as the size of all battery modules 20 in the width direction of the battery pack 3. In order to facilitate the connection between battery packs 3, the distance between the positive external interface 5 and the negative external interface 6 is usually close. Therefore, at least one of the first wire 71 and the second wire 72 needs to span a longer path in the battery pack 3. Therefore, it is also extremely important to reasonably design and layout the first wire 71 or the second wire 72 that spans a longer path.

[0102] In some embodiments, the positive external interface 5 and the negative external interface 6 are arranged at one end of the front wall 121 close to 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 arranged in the battery pack 3 across a longer path.

[0103] In some embodiments, the first wire 71 and the second wire 72 are both arranged in the distribution compartment 102. Due to the heat insulation effect of the isolation member 60 on the distribution compartment 102 and the battery compartment 101, the risk of electrical ignition caused by condensation on the first wire 71 and the second wire 72 can be effectively reduced.

[0104] In some embodiments, the first wire 71 and the second wire 72 are both disposed on the isolating member 60. The components can be isolated from the battery module 20 by the isolating member 60, and the assembly difficulty can be reduced by first integrating the components on the isolating member 60 and then installing the components on the base 11 as a whole.

[0105] In some embodiments, the first wire 71 is installed on the vertical plate 62. Since the vertical plate 62 faces the front wall 121, the first wire 71 can be easily connected to the positive electrode external interface 5.

[0106] In some embodiments, the second wire 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 bottom plate 61, and the second portion 722 is disposed on the vertical plate 62. In this embodiment, the first portion 721 of the second wire 72 is disposed on the bottom plate 61, and the length direction of the bottom plate 61 is the width direction of the battery pack 3, which is also the extension direction of the first portion 721, so that the first portion 721 with a longer span can be reasonably disposed on the bottom 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, so that the second portion 722 can be extended to the negative terminal 23 of the battery module 20 through the second portion 722 to connect with the negative terminal 23 of the battery module 20. By arranging the second wire 72 on the bottom plate 61 and the vertical plate 62, such a design can rationalize the wiring of the second wire 72 with a longer length, and can effectively avoid electrical sparks between the second wire 72 and other electronic devices.

[0107] In some embodiments, the first wire 71 and the second wire 72 are both copper bars. It is understandable that the first wire 71 and the second wire 72 can be hard copper bars or soft copper bars. Since the first wire 71 and the second wire 72 are copper bars.

[0108] In some embodiments, both ends of the vertical plate 62 in the width direction of the battery pack 3 are provided with wire grooves 63, the bottom plate 61 is provided with wire grooves 63, the first portion 721 passes through the wire grooves 63 on the bottom plate 61, and the second portion 722 passes through the wire grooves 63 on the vertical plate 62. By providing the wire grooves 63, both the first portion 721 and the second portion 722 can be stably provided on the isolation member 60.

[0109] In some embodiments, the module structure 8 further includes a fuse 80, which is connected to the first wire 71 or the second wire 72. Therefore, in the case of a system failure or a failure of the battery pack 3 itself (such as a short circuit), the fuse 80 can be quickly disconnected to ensure the safety of the battery pack 3 throughout its entire life cycle, including manufacturing, transportation, storage, maintenance, and operation.

[0110] In some embodiments, the fuse 80 is disposed in the power distribution compartment 102. Thus, the risk of condensation and electrical ignition at the fuse 80 can be reduced through the separation effect of the isolating member 60.

[0111] In some embodiments, the fuse 80 is disposed on the bottom plate 61, and the fuse 80 is connected to the first portion 721. Since the second wire 72 has a long span, it is convenient to connect with the fuse 80, and since the first portion 721 is disposed on the bottom plate 61, the fuse 80 can also be conveniently disposed on the bottom plate 61 to improve the connection stability of the fuse 80.

[0112] In some embodiments, in the width direction of the battery pack 3, that is, the length direction of the isolation member 60, the power board 40 and the fuse 80 are arranged at intervals. Since the volume of the fuse 80 and the power board 40 are both large, the space of the distribution compartment 102 can be reasonably utilized, and the size of the distribution compartment 102 can be effectively reduced in the first direction L, which is conducive to the miniaturization of the battery pack 3.

[0113] It is understandable that, in some other embodiments, the fuse 80 can also be provided outside the battery pack 3, and provided on the wire connecting the adjacent battery packs 3. Similarly, in the scenario of system failure or battery pack 3 failure itself (such as short circuit), the fuse 80 can achieve rapid disconnection.

[0114] Figure 8 for Figure 2 A schematic structural diagram of a battery management unit 30 of a battery pack 3 in an embodiment; Fig. 9 for Figure 8 Schematic diagram of the exploded view of the battery management unit 30.

[0115] Reference Figure 8 and Fig. 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 connected to the bottom shell 32 in a snap-fit ​​321 manner to form a receiving cavity 35, and the sampling plate 34 is located in the receiving cavity 35. In this embodiment, since the bottom shell 32 and the cover 33 are connected in a snap-fit ​​321 manner, the connection convenience between the bottom shell 32 and the cover 33 can be improved. The sampling plate 34 is arranged in the receiving cavity 35 surrounded by the bottom shell 32 and the cover 33, so that the sampling plate 34 can be reasonably protected to prevent the sampling plate 34 from being short-circuited with other electronic devices, such as wires.

[0116] In some embodiments, a buckle 321 is provided on the periphery of the bottom shell 32 , a slot 331 is provided on the periphery of the cover body 33 , and the bottom shell 32 and the cover body 33 are connected together through the buckle 321 and the slot 331 .

[0117] In some embodiments, the bottom shell 32 and the cover 33 are both made of non-conductive material to avoid short circuit with the sampling plate 34 .

[0118] Reference Figure 6 , Figure 8 and Fig. 9 In some embodiments, the bottom shell 32 is disposed in the assembly groove 621, and the cover 33 is connected to the isolation member 60 by snapping 321. The cover 33 and the isolation member 60 are snap-fitted and connected, and the bottom shell 32 is disposed in the assembly groove 621, so that the bottom shell 32 and the sampling plate 34 located in the accommodating cavity 35 can be stably connected to the isolation member 60.

[0119] Specifically, the engaging portion 31 is disposed on the cover body 33 so as to be engaged with the matching portion 65 on the isolation member 60 .

[0120] It is understandable that in some other embodiments, the bottom shell 32 and the isolating member 60 may be connected in a snap-fit ​​manner, for example, the snap-fitting portion 31 may be provided on the bottom shell 32 to snap-fit ​​with the matching portion 65 on the isolating member 60. The bottom shell 32 and the cover 33 may also be connected in a snap-fit ​​manner, but the bottom shell 32 or the cover 33 may be fixedly connected to the isolating member 60 by bolts or screws. The bottom shell 32 and the cover 33 may also be fixedly connected by bolts or screws, but the bottom shell 32 or the cover 33 may be connected in a snap-fit ​​manner to the isolating member 60.

[0121] It is understandable that in some other embodiments, the sampling plate 34 may be directly fixed on the isolating member 60, for example, in the assembly groove 621 of the isolating member 60, and then connected to the isolating member 60 through the cover 33, and the assembly groove 621 is covered to accommodate the sampling plate 34. In this way, the bottom shell 32 can be omitted, which not only reduces costs, but also saves space, which is conducive to the miniaturization of the battery pack 3.

[0122] Fig.10 for Figure 3 A local enlarged schematic diagram of point A in the middle.

[0123] Reference Figure 3 as well as Fig.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 realize the 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.

[0124] In some embodiments, the flexible circuit board 50 is located between the battery module 20 and the top wall 124 of the outer shell 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.

[0125] In some embodiments, the first connecting terminal 51 is connected to one end of the flexible circuit board 50 toward the isolation member 60, and the second connecting terminal 36 is connected to one end of the sampling plate 34 toward the top wall 124 of the housing 10, thereby facilitating reducing the distance between the first connecting terminal 51 and the second connecting terminal 36 to facilitate the connection between the first connecting terminal 51 and the second connecting terminal 36.

[0126] Specifically, the flexible circuit board 50 extends beyond the vertical plate 62 in the first direction L, and the first connecting terminal 51 is connected to the portion of the flexible circuit board 50 that extends beyond the vertical plate 62 in the first direction L, and the battery management unit 30 corresponds to the flexible circuit board 50 in the height direction of the battery pack 3, thereby facilitating the connection between the first connecting terminal 51 and the second connecting terminal 36, and there is no need for the flexible circuit board 50 to extend too long beyond the vertical plate 62 in the first direction L.

[0127] It is understandable that when there are multiple battery modules 20 , there are also multiple flexible circuit boards 50 and battery management units 30 , and each flexible circuit board 50 corresponds to a battery management unit 30 provided on the isolation member 60 in the height direction of the battery pack 3 .

[0128] Fig.11 for Figure 3 A local enlarged schematic diagram of point B in the middle.

[0129] Reference Figure 2 and Fig.11 In some embodiments, a space is provided between the separator 60 and the top wall 124 of the housing 10, so that part of the structure can extend to the area between the separator 60 and the top wall 124 during assembly, so as to improve the space utilization rate in the housing 10, which is conducive to the miniaturization of the battery pack 3. For example, the busbar 7 connected to the battery module 20, the positive terminal 22 and the negative terminal 23 of the battery module 20 can all be provided in the area between the separator 60 and the top wall 124 of the housing 10, and the flexible circuit board 50 can also pass through the area between the separator 60 and the top wall 124 of the housing 10 to connect with the battery management unit 30.

[0130] When the battery pack 3 is in thermal runaway, there is still a small amount of electrolyte spraying from the gap between the isolating member 60 and the top wall 124 of the housing 10 to the power board 40, the battery management unit 30, the copper busbar, etc., so there is still a risk of electrical ignition of the power board 40, the battery management unit 30, the copper busbar, etc. In order to avoid electrical ignition of the power board 40, the battery management unit 30, the copper busbar, etc. due to the electrolyte spraying to the distribution compartment 102. In some embodiments, the battery pack 3 also includes a foam strip 90 disposed between the battery module 20 and the top wall 124 of the housing 10, so that the area between the isolating member 60 and the top wall 124 of the housing 10 is filled with the foam strip 90, so that the electrolyte sprayed from the battery cell 21 of the battery module 20 can be basically completely prevented from being sprayed to the distribution compartment 102, thereby preventing the electronic devices (power board 40, battery management unit 30, copper busbar, etc.) located in the distribution compartment 102 from electrical ignition.

[0131] In some embodiments, the foam strip 90 is disposed between the battery module 20 and the top wall 124 of the housing 10, and in the height direction of the battery module 20, the foam strip 90 substantially corresponds to the position of the isolation member 60 or the end plate 25 of the battery module 20. Thus, the foam strip 90 can effectively isolate the electrolyte sprayed from the battery cell 21 of the battery module 20 from being sprayed toward the power distribution compartment 102.

[0132] In some embodiments, the foam strip 90 is in the shape of an elongated strip, and the extending direction of the foam strip 90 is the same as the extending direction of the isolation element 60 .

[0133] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: The battery pack includes an outer shell and an isolating member, a battery module and a battery management unit built into the outer shell. The battery management unit is arranged on the isolating member, and the isolating member is fixed in the outer shell and divides the space in the outer shell into a battery compartment and a distribution compartment distributed along a first direction. The battery management unit is located in the 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 bottom plate and a vertical plate integrally formed with the bottom plate, the vertical plate divides the space in the outer shell to form the battery compartment and the distribution compartment, the bottom plate is fixed to the base of the outer shell, the bottom plate is located on the side of the vertical plate away from the battery module, and the battery management unit is assembled on the side of the vertical plate away from the battery module.

3. The battery pack according to claim 1, characterized in that: A mounting groove is provided on a side of the isolating member away from the battery module, and the battery management unit is installed in the mounting groove.

4. The battery pack according to claim 3, characterized in that: The battery management unit includes a bottom shell, a cover body and a sampling plate. The cover body is snap-connected to the bottom shell to form a receiving cavity, and the sampling plate is located in the receiving cavity. The bottom shell is arranged in the assembly groove, and the cover body is snap-connected to the isolation member.

5. The battery pack according to claim 4, characterized in that: The battery pack further includes a flexible circuit board and a first connection terminal, wherein 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, a portion of the flexible circuit board extends into the power distribution compartment, and the first connection terminal is connected to the portion of the flexible circuit board extending into the power distribution compartment; The battery management unit further includes a second connection terminal connected to the sampling board, and the first connection terminal is connected to the second connection terminal.

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 arranged on the isolation member and are located in the distribution cabin.

7. The battery pack according to claim 6, characterized in that: The isolating member includes a bottom plate and a vertical plate integrally formed with the bottom plate, the vertical plate divides the space in the outer shell into the battery compartment and the distribution compartment, the bottom plate is fixed to the base of the outer shell, the bottom plate is located on the side of the vertical plate away from the battery module, the second wire includes a first part extending along the width direction of the battery pack and a second part extending from the end of the first part along the height direction of the battery pack, the first part is arranged on the bottom plate, and the second part is arranged on the vertical plate.

8. The battery pack according to claim 7, characterized in that: The vertical plate is provided with wire grooves at both ends in the width direction of the battery pack, the bottom plate is provided with a wire groove, the first part passes through the wire groove on the bottom plate, and the second part passes through the wire groove on the vertical plate.

9. The battery pack according to claim 6, characterized in that: The battery pack further includes a fuse disposed on the isolation member, and the fuse is connected to the first wire or the second wire.

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 arranged 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 that are opposite to each other in the first direction, the isolation member is located between the battery module and the front wall, and the power board is arranged on a side of the front wall facing the isolation member.

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 isolating member is in a strip shape and extends along the width direction of the battery pack. 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, two ends of the isolation member protrude from two ends of the battery module.

14. The battery pack according to claim 1, characterized in that: A gap is left between the isolating member and the top wall of the outer shell. The battery pack further comprises a foam strip. In the height direction of the battery pack, the foam strip is arranged in the gap area between the top wall of the outer shell and the isolating member. The height direction of the battery pack is perpendicular to the first direction.

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

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