Battery pack and energy storage device

Abstract

The present application relates to a battery pack and an energy storage device, the battery pack comprising: a battery case, a mounting chamber being formed inside the battery case; a separation mechanism, the separation mechanism being arranged in the mounting chamber and separating the mounting chamber into a first chamber and a second chamber; an electrical module, the electrical module being arranged in the second chamber; a battery module, a first part of the battery module being arranged in the first chamber, and a second part of the battery module being arranged in the second chamber and being electrically connected to the electrical module; and a liquid inlet tube and a liquid outlet tube, the liquid inlet tube and the liquid outlet tube being separately arranged on the battery case and both being communicated with the first chamber. The electrical module is separately mounted in the second chamber; because a cooling liquid circulates only in the first chamber, the electrical module will not be in direct contact with the cooling liquid, and thus will not cause contamination of the cooling liquid, which will result in reduction of the insulation performance of the cooling liquid and electrical safety problems, and in addition, the cooling liquid will not corrode various devices of the electrical module, thereby ensuring the service life and safety of the electrical module.

Description

Battery pack and energy storage device TECHNICAL FIELD

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

[0002] A battery pack refers to a whole that packs lithium ion batteries, a battery management system (BMS) and other necessary electrical components in a protective container. It is usually used in electric vehicles and rechargeable battery systems to provide a power source and store energy. Since a battery pack generates a large amount of heat during work, it needs to be cooled to ensure the safety and performance of the battery pack. At present, the cooling methods for battery packs mainly include air cooling and liquid cooling. Among them, liquid cooling is more widely used. The liquid cooling method mainly cools the battery through a cooling liquid. The cooling liquid flows through the heat exchanger (liquid cooling plate) at the bottom and side of the battery to take away the heat of the battery without direct contact with the battery. Another liquid cooling method is to immerse or spray the battery in an insulating cooling liquid to cool the battery.

[0003] However, when the traditional battery pack uses the immersion or spraying cooling method of insulating cooling liquid, the cooling liquid directly contacts the battery module, electrical connectors, voltage and temperature collection lines, high and low voltage output terminals, insulation protective materials and other devices in the battery pack. The cooling liquid can easily corrode the electrical devices and lines, reduce their service life, and cause the cooling liquid to be contaminated, the insulation performance to be reduced, the positive and negative electrodes to be short-circuited, and electrical safety problems to occur.

[0004] SUMMARY

[0005] Therefore, it is necessary to provide a battery pack and an energy storage device to solve the problems that the cooling liquid is easily contaminated and the battery pack components are easily corroded to reduce the service life.

[0006] In a first aspect, the present application provides a battery pack, comprising:

[0007] a battery box, an installation cavity is formed in the inside of the battery box;

[0008] a separation mechanism, the separation mechanism is arranged in the installation cavity and separates the installation cavity into a first cavity and a second cavity;

[0009] an electrical module, the electrical module is arranged in the second cavity;

[0010] a battery module, a first part of the battery module is arranged in the first cavity, and a second part of the battery module arranged in the second cavity is electrically connected with the electrical module; and

[0011] An inlet pipe and an outlet pipe are arranged on the battery box and communicate with the first cavity.

[0012] In the battery pack, the installation cavity is divided into the first cavity and the second cavity by the separation mechanism, and the inlet pipe and the outlet pipe are arranged on the battery box and communicate with the first cavity, so that the cooling liquid is transported from the inlet pipe into the first cavity to directly immerse and contact the first part of the battery module installed in the first cavity, the cooling liquid exchanges heat with the battery module to absorb the heat generated by the operation of the battery module, and then flows out from the outlet pipe to take away the heat, thereby achieving the effect of cooling the battery module; the electrical module is separately installed in the second cavity, the cooling liquid only flows in the first cavity, the electrical module does not directly contact the cooling liquid, and therefore the cooling liquid is not polluted, the insulation performance of the cooling liquid is not reduced, and the electrical safety problem is not caused, and the cooling liquid does not corrode each device of the electrical module, thereby ensuring the service life and safety of the electrical module, and the cooling liquid does not contact the positive and negative electrodes of the battery monomer, so that even if the insulation performance of the cooling liquid is reduced, short circuit is not caused.

[0013] The technical scheme of the present application is further described as follows:

[0014] In one embodiment, the separation mechanism includes a first partition plate arranged inside the battery box, the second cavity includes a containing compartment, the first partition plate divides the installation cavity into the containing compartment and the first cavity, the electrical module includes a signal acquisition module and a high-low voltage connection module, and the signal acquisition module and the high-low voltage connection module are arranged in the containing compartment.

[0015] In one embodiment, a side wall of the battery box surrounding the containing compartment is provided with a maintenance window, and a detachable maintenance cover plate is arranged on the maintenance window.

[0016] In one embodiment, the separation mechanism further includes at least one second partition plate arranged in a first gap inside the battery module and a second gap between the battery module and an inner wall of the battery box, and a space above the second partition plate is set as a battery connection compartment, and the battery connection compartment and the containing compartment jointly constitute the second cavity.

[0017] The electrical module further includes a signal acquisition wire harness and an electrical connector, and the signal acquisition wire harness and the electrical connector are arranged in the battery connection compartment and electrically connected with the battery module.

[0018] In one of the embodiments, the second partition plate comprises a frame and a first sealing member, the first sealing member is arranged in the frame, and the first sealing member cooperates with the frame to form a through hole, the battery cell of the battery module passes through the through hole, a part of the battery cell extends into the battery connecting cavity, and the second partition plate isolates the cooling liquid from the signal acquisition wire harness and the electrical connecting member.

[0019] Alternatively, the second partition plate is provided with a through hole, the battery cell of the battery module passes through the through hole, a part of the battery cell extends into the battery connecting cavity, and the battery cell and the through hole are sealingly connected through a sealing medium, so that the second partition plate isolates the cooling liquid from the signal acquisition wire harness and the electrical connecting member.

[0020] In one of the embodiments, the battery pack further comprises a second sealing member, the second sealing member is arranged between the first end of the battery module and the first partition plate, and / or the second sealing member is arranged between the second end of the battery module and the inner wall of the battery box.

[0021] The first end and the second end are opposite ends of the battery module, respectively.

[0022] In one of the embodiments, the battery pack further comprises a liquid leakage sensor, the liquid leakage sensor is arranged in the second cavity and is used to detect whether the cooling liquid leaks from the first cavity into the second cavity.

[0023] In one of the embodiments, the battery pack further comprises a pressure relief valve, the pressure relief valve is arranged on the side wall of the battery box.

[0024] In one of the embodiments, the battery module comprises at least two rows of battery cells, the at least two rows of battery cells are arranged side by side along a first direction of the battery box, each row of battery cells comprises a plurality of battery cells, and the plurality of battery cells are arranged in a stacked manner along a second direction of the battery box; during the flowing of the cooling liquid in the first cavity, the cooling liquid contacts the side surface of each row of battery cells to perform heat transfer, and the first direction is arranged intersecting the second direction.

[0025] In one of the embodiments, the battery module comprises a plurality of battery units, the plurality of battery units comprises first edge-side battery units, a middle portion battery unit group and second edge-side battery units, the first edge-side battery units are arranged close to one side wall of the battery box in the first direction, the second edge-side battery units are arranged close to the other side wall of the battery box in the first direction, the middle portion battery unit group is arranged in the middle of the first edge-side battery units and the second edge-side battery units, and the middle portion battery unit group comprises at least two rows of battery units arranged close to each other; during the flow of the cooling liquid in the first cavity, the cooling liquid contacts the side surfaces of the first edge-side battery units, the side surfaces of the middle portion battery unit group and the side surfaces of the second edge-side battery units to perform heat transfer.

[0026] In one of the embodiments, the battery module comprises a plurality of battery units, the plurality of battery units comprises a first battery unit group and a second battery unit group, the first battery unit group and the second battery unit group are arranged close to each other in the first direction of the battery box, the first battery unit group is arranged close to one side wall of the battery box in the first direction, the second battery unit group is arranged close to the other side wall of the battery box in the first direction, and the first battery unit group and the second battery unit group each comprises at least two rows of battery units arranged close to each other; during the flow of the cooling liquid in the first cavity, the cooling liquid contacts the side surfaces of the first battery unit group and the second battery unit group to perform heat transfer.

[0027] In one of the embodiments, the battery module comprises at least two rows of battery units, the at least two rows of battery units are arranged close to each other in the first direction of the battery box, each row of battery units comprises a plurality of battery monomers, the plurality of battery monomers are arranged in a stack in the second direction of the battery box, and flow channel partitions are arranged between the stacked surfaces of the battery monomers; during the flow of the cooling liquid in the first cavity, the cooling liquid can pass through the flow channel partitions to contact the side surfaces of the battery monomers to perform heat transfer; wherein the first direction and the second direction are arranged to intersect each other.

[0028] In one of the embodiments, a plurality of accommodation compartments are arranged in the mounting cavity, and all the accommodation compartments are in communication with the first cavity.

[0029] The battery module comprises a plurality of battery monomers, at least one battery monomer is arranged in each of the accommodation compartments, and during the flow of the cooling liquid in the first cavity, the cooling liquid flows into the accommodation compartments to contact the battery monomers to perform heat transfer.

[0030] In one of the embodiments, the battery box comprises a lower box body and an upper cover, and the upper cover and the lower box body enclose the mounting cavity.

[0031] The second aspect of the present application also provides an energy storage device comprising the battery pack as described above. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations to the present application.

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0034] Fig. 1 is an exploded structural view of the battery pack according to an embodiment of the present application.

[0035] Fig. 2 is a cross-sectional structural view of the battery box and the partition mechanism after being assembled.

[0036] Fig. 3 is a structural view of the cooling liquid flow mode according to an embodiment of the present application.

[0037] Fig. 4 is a structural view of the cooling liquid flow mode according to another embodiment of the present application.

[0038] Fig. 5 is a structural view of the battery cells arranged closely to each other.

[0039] Fig. 6 is a structural view of the battery cells arranged with flow channel partitions.

[0040] Fig. 7 is a structural view of the battery cells arranged to form flow channels according to an embodiment.

[0041] Fig. 8 is a structural view of the battery cells arranged to form flow channels according to another embodiment.

[0042] Fig. 9 is a structural view of the battery cells arranged to form flow channels according to yet another embodiment.

[0043] Explanation of reference signs:

[0044] 100, battery pack; 10, battery box; 11, lower box body; 12, upper cover; 13, maintenance window; 14, maintenance cover plate; 20, first partition plate; 30, second partition plate; 31, via hole; 32, frame body; 33, first sealing member; 40, first cavity; 40a, second cavity; 50, containing bin; 60, battery connecting bin; 70, electrical module; 71, signal acquisition module; 72, high-low voltage connection module; 73, signal acquisition wire harness; 74, electrical connecting member; 80, battery module; 80a, first part; 80b, second part; 81, battery unit; 81a, first side battery unit; 81b, second side battery unit; 81c, middle part battery unit group; 81d, first battery unit group; 81e, second battery unit group; 82, battery monomer; 90, liquid inlet pipe; 90a, liquid outlet pipe; 90b, pressure relief valve; 90c, flow passage partition plate; 90d, second sealing member. DETAILED DESCRIPTION

[0045] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit of the present application, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0048] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "mount", "connect", "connection", "fixed", and the like, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "mount", "connect", "connection", "fixed", and the like, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0051] Referring to FIGS. 1, 2 and 3, a battery pack 100 according to an embodiment of the present application includes a battery box 10, a partition mechanism, an electrical module 70, a battery module 80, an inlet pipe 90 and an outlet pipe 90a.

[0052] The battery box 10 is a load-bearing main body of the battery pack 100, and is used to load and integrate the partition mechanism, the electrical module 70, the battery module 80, the inlet pipe 90 and the outlet pipe 90a. The battery box 10 is made of metal material to obtain sufficient structural strength. In order to facilitate hoisting and carrying, lifting lugs are reserved on the outer wall of the battery box 10.

[0053] The battery box 10 has an installation cavity formed inside. In one embodiment, the battery box 10 comprises a lower box body 11 and an upper cover 12, which is detachably arranged at the upper end opening of the lower box body 11, and the upper cover 12 and the lower box body 11 enclose the installation cavity. When the upper cover 12 is detached from the lower box body 11, the inner cavity of the lower box body 11 is opened, thereby facilitating the installation or removal of the functional components such as the battery module 80. When the upper cover 12 is combined with the lower box body 11, the installation cavity is formed into a sealed cavity, preventing the leakage of the cooling liquid or the entry of impurities such as dust from the external environment into the installation cavity, thereby affecting the safety of the electrical module 70 and the battery module 80.

[0054] Please continue to refer to FIG. 2, FIG. 5 and FIG. 6. The separation mechanism is arranged in the installation cavity and separates the installation cavity into a first cavity 40 and a second cavity 40a. The second cavity 40a comprises a containing compartment 50 and a battery connecting compartment 60. The electrical module 70 is arranged in the second cavity 40a. The first part 80a of the battery module 80 (such as the part of the battery module 80 in the lower dashed box in FIG. 5 and FIG. 6) is arranged in the first cavity 40, and the second part 80b of the battery module 80 (such as the part of the battery module 80 in the upper dashed box in FIG. 5 and FIG. 6) arranged in the second cavity 40a is electrically connected with the electrical module 70. The liquid inlet pipe 90 and the liquid outlet pipe 90a are arranged on the battery box 10 and are both in communication with the first cavity 40.

[0055] For example, the liquid inlet pipe 90 and the liquid outlet pipe 90a are connected to the liquid supply device through pipes, respectively, and the liquid supply device provides the cooling liquid and the power required for the flow of the cooling liquid, thereby ensuring the circulation of the cooling liquid between the liquid supply device and the battery pack 100.

[0056] In summary, the technical scheme of the embodiment has the following beneficial effects: in the battery pack 100, the separation mechanism is installed in the battery box 10, so that the installation cavity is separated into the first cavity 40 and the second cavity 40a, the liquid inlet pipe 90 and the liquid outlet pipe 90a are further installed on the battery box 10, the liquid inlet pipe 90 and the liquid outlet pipe 90a are in communication with the first cavity 40, so that the cooling liquid is delivered from the liquid inlet pipe 90 to the first cavity 40 to directly immerse and contact the first part 80a of the battery module 80 installed in the first cavity 40, the cooling liquid exchanges heat with the battery module 80 to absorb the heat generated by the operation of the battery module 80, and then flows out from the liquid outlet pipe 90a to take away the heat, so as to achieve the effect of cooling the battery module 80; the electrical module 70 is separately installed in the second cavity 40a, because the cooling liquid only flows in the first cavity 40, the electrical module 70 will not directly contact the cooling liquid, so the cooling liquid will not be contaminated, the insulation performance of the cooling liquid will not be reduced, and the electrical safety problem will not be caused, and the cooling liquid will not corrode each device of the electrical module 70, so as to ensure the service life and safety of the electrical module 70, and the cooling liquid will not contact the positive and negative electrodes of the battery monomer 82, so even if the insulation performance of the cooling liquid is reduced, the short circuit will not be caused.

[0057] Please continue to refer to FIG. 1 and FIG. 2, in an embodiment, the battery box 10 is a cuboid, the separation mechanism includes a first partition plate 20, the first partition plate 20 is arranged in the interior of the battery box 10, for example, the first partition plate 20 is arranged at one end of the second direction (i.e. the length direction) of the battery box 10, but is kept spaced from the side wall of the end without contact. The second cavity includes a containing bin 50, the first partition plate 20 separates the installation cavity to form the containing bin 50 and the first cavity 40, the electrical module 70 includes a signal acquisition module 71 and a high-low voltage connection module 72, the signal acquisition module 71 and the high-low voltage connection module 72 are respectively arranged in the containing bin 50. Thus, the first partition plate 20 can isolate the containing bin 50 from the first cavity 40, the first part 80a of the battery module 80 is installed in the first cavity 40, and the signal acquisition module 71 and the high-low voltage connection module 72 are installed in the containing bin 50, the cooling liquid will not flow into the containing bin 50, so it will not contact the signal acquisition module 71 and the high-low voltage connection module 72, the signal acquisition module 71 and the high-low voltage connection module 72 will not contaminate the cooling liquid, and the cooling liquid will not corrode the signal acquisition module 71 and the high-low voltage connection module 72, so as to ensure the safe and reliable use of the battery module 80, the signal acquisition module 71 and the high-low voltage connection module 72.

[0058] For example, in order to ensure the isolation effect of the first partition plate 20, the first partition plate 20 can be sealingly connected with the side wall of the installation cavity by welding, bonding or the like, so as to prevent the cooling liquid flowing in the first cavity 40 from leaking into the containing bin 50.

[0059] Further, the side wall of the battery box 10 surrounding the accommodating cavity 50 is provided with a maintenance window 13, and a detachable maintenance cover plate 14 is installed on the maintenance window 13. In actual use, when the signal acquisition module 71 and / or the high-low voltage connection module 72 is damaged, the maintenance cover plate 14 is removed, and the damaged signal acquisition module 71 and / or the high-low voltage connection module 72 can be directly repaired through the maintenance window 13 without being disassembled and taken out, thereby improving the convenience of maintenance work.

[0060] For example, the maintenance cover plate 14 can be detachably connected with the battery box 10 in at least one mode such as but not limited to screw connection, clamping connection, magnetic attraction connection, and adhesive connection, which can be flexibly selected according to actual needs.

[0061] In addition, on the basis of any of the above embodiments, the partition mechanism further comprises at least one second partition plate 30, which is arranged in a first gap inside the battery module 80 and a second gap between the battery module 80 and the inner wall of the battery box 10. The first gap inside the battery module 80 specifically refers to the sum of the fitting gaps between each battery monomer 82 inside the battery module 80. Arranging the second partition plate 30 in the first gap and the second gap mainly serves to seal the first gap and the second gap.

[0062] Specifically, the second partition plate 30 can be flexibly moved up and down within the height range of the first part 80a of the battery module 80, so as to adapt to battery modules 80 of different sizes to partition first cavities 40 and second cavities 40a of different sizes, thereby expanding the application range. The space above the second partition plate 30 is the battery connection cavity 60, and the battery connection cavity 60 and the accommodating cavity 50 jointly form the second cavity 40a; the electrical module 70 further comprises a signal acquisition wire harness 73 and an electrical connector 74, both of which are arranged in the battery connection cavity 60 and electrically connected with the battery module 80.

[0063] It should be noted that the battery connection cavity 60 and the accommodating cavity 50 can be in communication or separated, as long as the wire harness connection and electrical connection are met.

[0064] By further arranging the second partition plate 30, the signal acquisition wire harness 73 and the electrical connector 74 can be arranged separately in the battery connection cavity 60 to be isolated from the cooling liquid arranged in the first cavity 40, so that in the use process of the battery pack 100, the cooling liquid only contacts and cools the lower part of the battery module 80, and does not contact the signal acquisition wire harness 73 and the electrical connector 74, that is, the cooling liquid is prevented from being contaminated by the signal acquisition wire harness 73 and the electrical connector 74, and at the same time, the cooling liquid is prevented from corroding the signal acquisition wire harness 73 and the electrical connector 74.

[0065] For example, in order to ensure the isolation effect of the second partition plate 30, the second partition plate 30 can be sealed and connected with the side wall of the installation cavity and the first partition plate 20 by welding, bonding or the like, so as to prevent the cooling liquid flowing in the first cavity 40 from leaking into the battery connecting cavity 60.

[0066] Further, the second partition plate 30 is provided in multiple pieces, and the multiple pieces of the second partition plate 30 are arranged in layers and are spaced apart, and a layer of cavity is formed between the two adjacent second partition plates 30, that is, the first cavity 40 is divided into a multi-layer cavity structure.

[0067] Please continue to refer to FIG. 1. Specifically, in one embodiment, the second partition plate 30 includes a frame body 32 and a first sealing member 33, the first sealing member 33 is arranged in the frame body 32, and the first sealing member 33 cooperates with the frame body 32 to form a through hole 31, the battery monomer 82 of the battery module 80 passes through the through hole 31, and a part of the battery monomer 82 extends into the battery connecting cavity 60. The second partition plate 30 isolates the cooling liquid from the signal collection wire harness 73, the electrical connecting member 74 and the positive and negative electrodes of the battery monomer 82, that is, the second partition plate 30 prevents the cooling liquid from directly contacting the signal collection wire harness 73, the electrical connecting member 74 and the positive and negative electrodes of the battery monomer 82. The through hole 31 is arranged to allow the upper part of the battery monomer 82 to pass through, so that the signal collection wire harness 73 and the electrical connecting member 74 can smoothly extend into the battery connecting cavity 60, and the first sealing member 33 can also seal the through hole 31 to prevent the cooling liquid from leaking into the battery connecting cavity 60 through the through hole 31.

[0068] In this application, the frame body 32 is a rectangular structure, and the first sealing member 33 is a grid structure arranged in the frame body. The length direction of the first sealing member 33 is used for sealing between the battery monomers 81, and the width direction of the first sealing member 33 is used for sealing between the battery monomers 82. For example, the sealing member between the battery monomers 82 can be replaced by glue or a sealing gasket.

[0069] Optionally, the first sealing member 33 can be a metal piece or a plastic piece, which is sealed by glue, a sealing ring or the like, and can be flexibly selected as needed.

[0070] In addition, the thickness of the first sealing member 33 should be adjustable, and the up-down position should also be adjustable, so as to meet the needs of different sealing use scenarios.

[0071] Alternatively, as an alternative to the above embodiment, the second partition plate 30 is provided with a through hole 31, and the battery monomer 82 of the battery module 80 passes through the through hole 31, and a part of the battery monomer 82 extends into the battery connecting bin 60, and the battery monomer 82 and the through hole 31 are sealed and matched by a sealing medium, so that the second partition plate 30 isolates the cooling liquid from the signal collection wire harness 73, the electrical connection 74 and the positive and negative electrodes of the battery monomer 82. The difference from the above embodiment is that the second partition plate 30 does not provide the first sealing member 33 in this embodiment, and when the cooperation gap between the battery monomer 82 and the through hole 31 is small, the gap can be sealed by directly coating the sealing medium to meet the sealing requirement of the cooling liquid. For example, the sealing medium can be but not limited to glue and the like.

[0072] Further, the battery pack 100 further comprises a second sealing member 90d, and the first end of the battery module 80 and the first partition plate 20 are provided with the second sealing member 90d, and / or the second end of the battery module 80 and the inner wall of the battery box 10 are provided with the second sealing member 90d. In this way, the second sealing member 90d can seal and connect the first end of the battery module 80 and the first partition plate 20, and seal and connect the second end of the battery module 80 and the inner wall of the battery box 10, thereby forming a detour flow channel in the first cavity 40. The path of the cooling liquid flowing in the detour flow channel is long, which increases the time length of the cooling liquid staying in the first cavity 40, so that the cooling liquid can exchange heat with the battery module 80 more fully and completely, thereby strengthening the cooling effect of the battery module 80.

[0073] Optionally, the second sealing member 90d can be a sealing component such as glue, sealing gasket, sealing plate, etc., which can be flexibly set according to actual needs.

[0074] For example, as shown in FIG. 7, in one embodiment, when the battery module 80 contains four battery units 81, from top to bottom, the ends of the first and third battery units 81 and the first partition plate 20 are sealed and blocked by the second sealing member 90d, and the ends of the second and fourth battery units 81 and the inner wall of the battery box 10 are sealed and blocked by the second sealing member 90d, thereby forming five length-direction flow channels for the cooling liquid to flow between the battery units 81 in a serpentine manner, ensuring the cooling effect.

[0075] Alternatively, as shown in FIG. 8, in another embodiment, four battery units 81 are provided, and the middle two battery units 81 are arranged in parallel and close to each other, thereby forming two length-direction flow channels.

[0076] Or, as shown in FIG. 9, in another embodiment, four battery units 81 are arranged, and the first and second battery units 81 are arranged in parallel and close to each other from top to bottom, and the third and fourth battery units 81 are also arranged in parallel and close to each other, so that three lengthwise flow channels can be formed.

[0077] In addition, on the basis of any of the above embodiments, the battery pack 100 further comprises a liquid leakage sensor arranged in the second cavity 40a and used to detect whether the cooling liquid leaks from the first cavity 40 into the second cavity 40a. When the liquid leakage sensor detects a leakage, it will feed back a signal to the staff in time, for example, to the terminal equipment such as the background monitoring equipment or the mobile phone carried by the staff, so that the staff can intervene in time to eliminate potential safety hazards.

[0078] The battery pack 100 further comprises a pressure relief valve 90b (and / or a fire fighting interface), which is arranged on the side wall of the battery box 10. When the battery module 80 works abnormally to generate gas and increase the pressure, the pressure relief valve 90b can be blown off to discharge and relieve the pressure, preventing the safety accident of battery explosion and avoiding the direct contact of the leaked electrolyte or flame with the cooling liquid after the battery thermal runaway.

[0079] Please continue to refer to FIGS. 3, 5 and 7. In this application, the cooling liquid flowing through the first cavity 40 absorbs heat from the battery module 80 to cool and dissipate heat of the battery module 80. There are many ways to achieve this, for example, in an optional embodiment, the battery module 80 comprises at least two rows of battery units 81 arranged side by side along the first direction (i.e. the width direction, the same below) of the battery box 10, each row of battery units 81 comprises a plurality of battery monomers 82 stacked along the second direction (i.e. the length direction, the same below) of the battery box 10, and the cooling liquid contacts the side surface of each row of battery units 81 to transfer heat during the flow in the first cavity 40.

[0080] Or, please continue to refer to FIGS. 4 and 6. In another optional embodiment, the battery module 80 comprises at least two rows of battery units 81 arranged side by side along the first direction of the battery box 10, each row of battery units 81 comprises a plurality of battery monomers 82 stacked along the second direction of the battery box 10, and a flow channel partition 90c is arranged between the stacked surfaces of the battery monomers 82. During the flow of the cooling liquid in the first cavity 40, the cooling liquid can not only contact the side surface of each row of battery units 81 to transfer heat, but also can transfer heat to the side surface (i.e. the stacked surface) of the battery monomers 82 through the flow channel partition 90c.

[0081] In the above two embodiments, the cooling liquid can be in effective contact with all the battery cells 82, thereby ensuring sufficient heat exchange between the battery cells 82 and the cooling liquid, so that the cooling liquid can more effectively absorb more heat generated by the battery cells 82 and carry it away, ensuring the cooling effect of the battery module 80.

[0082] It should be noted that the battery cells 81 can be closely arranged, or there can be flow channels for the cooling liquid to pass through, or the largest side of the last battery cell 82 can have a flow channel.

[0083] Specifically, as shown in FIG. 8, or in another embodiment, the battery module 80 includes a plurality of battery cells 81, which include first edge battery cells 81a, a middle battery cell group 81c, and second edge battery cells 81b, the first edge battery cells 81a are arranged close to the side wall of one side of the battery box 10 in the first direction, the second edge battery cells 81b are arranged close to the side wall of the other side of the battery box 10 in the first direction, the middle battery cell group 81c is arranged between the first edge battery cells 81a and the second edge battery cells 81b, and the middle battery cell group 81c includes at least two rows of battery cells 81 arranged side by side and close to each other; wherein the cooling liquid contacts the side surfaces of the first edge battery cells 81a, the side surfaces of the middle battery cell group 81c, and the side surfaces of the second edge battery cells 81b during the flow of the cooling liquid in the first cavity 40 to perform heat transfer.

[0084] Alternatively, as shown in FIG. 9, in another embodiment, the battery module 80 includes a plurality of battery cells 81, which are divided into a first battery cell group 81d and a second battery cell group 81e, the first battery cell group 81d and the second battery cell group 81e are arranged side by side and spaced apart along the first direction of the battery box 10, the first battery cell group 81d is further arranged spaced apart from the side wall of one side of the battery box 10 in the first direction, and the second battery cell group 81e is further arranged spaced apart from the side wall of the other side of the battery box 10 in the first direction, the first battery cell group 81d and the second battery cell group 81e each include at least two rows of battery cells 81 arranged side by side and close to each other; wherein the cooling liquid contacts the side surfaces of the first battery cell group 81d and the second battery cell group 81e during the flow of the cooling liquid in the first cavity 40 to perform heat transfer.

[0085] As can be easily understood, in the above two embodiments, different flow channel schemes can be formed according to different arrangements of the battery cells 81, and the cooling liquid can flow in the flow channels to contact each battery cell 81 to perform heat transfer, thereby achieving the purpose of cooling the battery module 80. The flow channel specifically refers to the serpentine channel indicated by the arrow in FIGS. 7-9.

[0086] It is also to be noted that the height of the second partition plate 30 is adjustable, so that the height of the first cavity 40 formed by the first partition plate 20 and the second partition plate 30 is adjustable (it is easy to understand that the height of the first partition plate 20 is adjusted adaptively according to the change of the height of the second partition plate 30), which means that the height of the battery cell 82 immersed in the cooling liquid is adjustable. By adjusting the height of the second partition plate 30, the amount of cooling liquid and the contact area with the battery cell 82 are adjusted, so that the comprehensive balance of safety, cooling effect, cost, manufacturing convenience and other effects is achieved.

[0087] In addition, in addition to adjusting the height of the second partition plate 20, the effective height of the first cavity 40 can also be adjusted by adjusting the thickness of the second partition plate 30, and the contact area between the second partition plate 30 and the battery box 11 can also be adjusted, so that better sealing performance is achieved.

[0088] It is also to be noted that the first direction and the second direction are intersected. For example, the first direction and the second direction are perpendicular at 90°.

[0089] In another optional embodiment, a plurality of receiving compartments are arranged in the mounting cavity. For example, the battery pack 100 further comprises a mounting frame arranged in the first cavity 40, and the mounting frame is provided with a plurality of receiving compartments, all of which are in communication with the first cavity 40. The battery module 80 comprises a plurality of battery cells 82, and at least one battery cell 82 is arranged in each receiving compartment.

[0090] For example, when the first cavity 40 is rectangular, the mounting frame is also rectangular, and the inside of the mounting frame is separated by a grid structure to form a plurality of receiving compartments arranged in an array. The grid structure is provided with a through hole corresponding to the side wall of each receiving compartment, so that each receiving compartment is in communication with the first cavity 40 through the corresponding through hole, and the cooling liquid in the first cavity 40 can flow into the receiving compartment through the through hole.

[0091] Alternatively, the cooling liquid can also flow into the receiving compartment through the gap between the mounting frame and the side wall of the battery box 10.

[0092] Alternatively, the mounting frame is provided with a flow channel, and the cooling liquid in the first cavity 40 flows into the receiving compartment through the flow channel to cool the battery cell 82, etc.

[0093] For example, in the basic embodiment, only one battery cell 82 is arranged in each receiving compartment. Alternatively, in other embodiments, more than one battery cell 82 is arranged in each receiving compartment, and the number of battery cells 82 arranged in different receiving compartments can be the same or different, which can be selected flexibly according to actual needs.

[0094] During the flowing of the cooling liquid in the first cavity 40, the cooling liquid flows into the containing compartments to exchange heat with the battery monomers 82, thereby achieving cooling of the battery monomers 82. Compared with the above-mentioned several embodiments, the plurality of battery monomers 82 need to be stacked and assembled into a column to form the battery unit 81, and then the heavy and bulky battery unit 81 is placed in the first cavity 40, which has the problems of high labor intensity, difficult installation operation and inconvenience. In this embodiment, the battery monomers 82 can be sequentially loaded into the corresponding containing compartments, the weight of the single battery monomer 82 is smaller and the volume is smaller, so that the installation operation is more convenient and labor-saving. In addition, the side wall of the containing compartment can also limit the battery monomer 82 from the side, which helps to improve the installation stability of the battery monomer 82.

[0095] In addition, the application also provides a kind of energy storage equipment, it includes the battery pack 100 described in any one of the above embodiments.

[0096] For example, the energy storage equipment also includes a container, the battery cluster frame is installed in the container, and the installation compartment is formed in the battery cluster frame, one battery pack 100 is arranged in each installation compartment, and each battery pack 100 is connected in series and parallel, so that the energy storage equipment can obtain higher energy storage density and strengthen the energy supply capacity of the electric device.

[0097] The electric device can be of various types, such as a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric vehicle, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as a drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer.

[0098] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0099] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery box, an installation cavity being formed in an interior of the battery box; a partition mechanism, which is arranged in the installation cavity and partitions the installation cavity into a first cavity and a second cavity; an electrical module, which is arranged in the second cavity; a battery module, a first part of the battery module being arranged in the first cavity, and a second part of the battery module arranged in the second cavity being electrically connected with the electrical module; and an inlet pipe and an outlet pipe, which are respectively arranged on the battery box and are both in communication with the first cavity. The partition mechanism comprises a first partition plate, which is arranged in the interior of the battery box, and the second cavity comprises a containing compartment, the first partition plate partitioning the installation cavity into the containing compartment and the first cavity, the electrical module comprising a signal acquisition module and a high-low voltage connection module, the signal acquisition module and the high-low voltage connection module being arranged in the containing compartment.

2. The battery pack of claim 1, wherein, A side wall of the battery box surrounding the containing compartment is provided with a maintenance window, and a detachable maintenance cover plate is arranged on the maintenance window.

3. The battery pack of claim 2, wherein, The partition mechanism further comprises at least one second partition plate, the second partition plate being arranged in a first gap in the interior of the battery module and a second gap between the battery module and an inner wall of the battery box, and a space above the second partition plate being provided as a battery connection compartment, the battery connection compartment and the containing compartment jointly constituting the second cavity.

4. The battery pack of claim 2, wherein, The electrical module further comprises a signal acquisition wire harness and an electrical connector, the signal acquisition wire harness and the electrical connector being both arranged in the battery connection compartment and being electrically connected with the battery module. The second partition plate comprises a frame and a first sealing member, the first sealing member being arranged in the frame, and the first sealing member and the frame cooperating to form a through hole, a battery cell of the battery module passing through the through hole, a part of the battery cell extending into the battery connection compartment, the second partition plate isolating the cooling liquid from the signal acquisition wire harness and the electrical connector.

5. The battery pack of claim 4, wherein, Alternatively, the second partition plate is provided with a through hole, a battery cell of the battery module passing through the through hole, a part of the battery cell extending into the battery connection compartment, and the battery cell and the through hole being sealingly connected through a sealing medium, so that the second partition plate isolates the cooling liquid from the signal acquisition wire harness and the electrical connector. The battery pack further comprises a second sealing member, the second sealing member being arranged between a first end of the battery module facing the first partition plate and the first partition plate, and / or the second sealing member being arranged between a second end of the battery module facing an inner wall of the battery box and the inner wall of the battery box.

6. The battery pack of claim 5, wherein, The first end and the second end are respectively opposite two ends of the battery module. The battery pack further comprises a liquid leakage sensor, which is arranged in the second cavity and is used to detect whether the cooling liquid leaks from the first cavity into the second cavity.

7. The battery pack of claim 1, wherein, The battery pack further comprises a pressure relief valve, which is arranged on a side wall of the battery box. ​ 8. The battery pack of claim 1, wherein, The battery module comprises at least two rows of battery units, the at least two rows of battery units are arranged side by side along a first direction of the battery box, each row of battery units comprises a plurality of battery monomers, and the plurality of battery monomers are arranged in a stacked manner along a second direction of the battery box; wherein the cooling liquid contacts the side surfaces of each row of battery units during the flow in the first cavity to perform heat transfer, and the first direction is arranged intersecting the second direction.

9. The battery pack of claim 1, wherein, The battery module comprises a plurality of rows of battery units, the plurality of rows of battery units comprises first edge-side battery units, a middle portion battery unit group and second edge-side battery units, the first edge-side battery units are arranged close to one side wall of the first direction of the battery box, the second edge-side battery units are arranged close to the other side wall of the first direction of the battery box, and the middle portion battery unit group is arranged in a spaced manner between the first edge-side battery units and the second edge-side battery units, and the middle portion battery unit group further comprises at least two rows of battery units arranged side by side close to each other; wherein the cooling liquid contacts the side surfaces of the first edge-side battery units, the side surfaces of the middle portion battery unit group and the side surfaces of the second edge-side battery units during the flow in the first cavity to perform heat transfer.

10. The battery pack of claim 1, wherein, The battery module comprises a plurality of rows of battery units, the plurality of rows of battery units are divided into a first battery unit group and a second battery unit group, the first battery unit group and the second battery unit group are arranged side by side in a spaced manner along a first direction of the battery box, the first battery unit group is further arranged in a spaced manner with one side wall of the first direction of the battery box, the second battery unit group is further arranged in a spaced manner with the other side wall of the first direction of the battery box, and the first battery unit group and the second battery unit group each comprise at least two rows of battery units arranged side by side close to each other; wherein the cooling liquid contacts the side surfaces of the first battery unit group and the second battery unit group during the flow in the first cavity to perform heat transfer.

11. The battery pack of claim 1, wherein, The battery module comprises at least two rows of battery units, the at least two rows of battery units are arranged side by side along a first direction of the battery box, each row of battery units comprises a plurality of battery monomers, and the plurality of battery monomers are arranged in a stacked manner along a second direction of the battery box, and flow channel partitions are arranged between the stacked surfaces of the battery monomers; the cooling liquid can pass through the flow channel partitions to perform heat transfer with the side surfaces of the battery monomers during the flow in the first cavity; wherein the first direction is arranged intersecting the second direction.

12. The battery pack of claim 1, wherein, The mounting cavity is provided with a plurality of accommodation compartments, and all the accommodation compartments are in communication with the first cavity. The battery module comprises a plurality of battery monomers, at least one battery monomer is installed in each accommodation compartment, and the cooling liquid performs heat transfer with the battery monomers by flowing into the accommodation compartments during the flow in the first cavity.

13. The battery pack of claim 1, wherein, The battery box comprises a lower box body and an upper cover, and the upper cover and the lower box body enclose the mounting cavity.

14. An energy storage device, characterized by, The battery pack comprises the battery module according to any one of claims 1 to 13.

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