Liquid-cooled battery pack

Abstract

The liquid-cooled battery pack comprises a liquid-cooled plate bottom support assembly, the liquid-cooled plate bottom support assembly comprises a liquid-cooled plate and a bottom support which are connected together from top to bottom, the bottom support comprises an outer frame and a reinforcing beam, the reinforcing beam is arranged in the outer frame in the first direction, and the outer frame and the reinforcing beam are both hollow profiles. The outer frame surrounds the bottom edge of the liquid cooling plate; the battery cell module is arranged on the liquid cooling plate bottom support assembly; and the box cover is connected with the liquid cooling plate bottom support assembly and seals the battery cell module. The number of structural parts needed by the bottom support is reduced, the outer frame provides a stable supporting boundary for the liquid cooling plate, the reinforcing beams further enhance the overall rigidity of the bottom support, the hollow sectional materials are adopted as materials of the outer frame and the reinforcing beams, the weight of the whole bottom support structure is greatly reduced while enough strength is guaranteed, and the structure is simple and convenient. The outer frame and the stiffening beams are relatively simple in structure and easy to process, so that the production process can be simplified, and quality control is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a liquid cooling battery pack. BACKGROUND

[0002] Energy storage systems play a vital role in modern energy systems. In order to improve the storage and output capacity of energy storage systems, the energy density of the battery cell is continuously improved and the capacity is continuously increased, which greatly increases the heat generated by the battery cell during charging and discharging. The traditional air cooling technology has been difficult to meet the heat dissipation demand. The liquid cooling scheme can take away the heat generated by the battery through the circulation of the cooling liquid in the battery cell module, thereby achieving heat dissipation and temperature control of the battery. Due to its higher heat exchange efficiency, better heat dissipation effect, lower noise pollution and higher space utilization, the liquid cooling scheme has become a key technology to solve the heat dissipation problem of large-capacity batteries and has been widely used in the field of energy storage batteries.

[0003] In the prior art, in order to improve the space utilization, the liquid cooling plate is often arranged below the battery cell as part of the support of the bottom of the battery pack. Due to the material limitation of the liquid cooling plate, it is often necessary to add structural members to strengthen the bottom of the liquid cooling plate. The profile of the structural member is generally made of sheet metal welding.

[0004] In the process of realizing the utility model, the inventors found that at least the following problems exist in the prior art: the structural member design of the bottom of the liquid cooling plate of the liquid cooling battery pack is relatively complex, the profile of the structural member is relatively thick and heavy, and a large number of structural members are required, which results in a large weight of the liquid cooling battery pack, high manufacturing cost and low processing efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims to at least solve one of the technical problems in the related art to some extent.

[0006] Therefore, the purpose of the utility model is to provide a liquid cooling battery pack, which reduces the complexity of the structural member at the bottom of the liquid cooling plate, meets the structural strength, and reduces the weight of the battery pack.

[0007] To achieve the above purpose, the utility model provides a liquid cooling battery pack, which comprises:

[0008] The liquid cooling plate bottom support assembly comprises a liquid cooling plate and a bottom support connected together from top to bottom, the bottom support comprises an outer frame and a reinforcing beam, the reinforcing beam is arranged in the outer frame along a first direction, the outer frame and the reinforcing beam are both hollow profiles, and the outer frame surrounds the bottom edge of the liquid cooling plate.

[0009] The battery cell module is arranged on the liquid cooling plate bottom support assembly.

[0010] The box cover is connected with the liquid cooling plate bottom support assembly and closes the battery cell module.

[0011] According to the liquid-cooled battery pack, the bottom support is provided below the liquid-cooled plate, the base includes an outer frame and a reinforcing beam, the reinforcing beam is arranged in the outer frame along a first direction, the outer frame and the reinforcing beam are both hollow profiles, the outer frame surrounds the bottom edge of the liquid-cooled plate, thereby reducing the number of structural members required by the bottom support, the outer frame provides a stable support boundary for the liquid-cooled plate, the reinforcing beam further enhances the overall rigidity of the bottom support, the hollow profile is adopted as the material of the outer frame and the reinforcing beam, the weight of the entire bottom support structure is greatly reduced while sufficient strength is ensured, the structure of the outer frame and the reinforcing beam is relatively simple and easy to process, the production process can be simplified, and quality control is facilitated.

[0012] According to an embodiment of the utility model, connecting hole that extends along vertical direction is equipped on liquid-cooled plate and bottom support, liquid-cooled plate and bottom support utilize fastener connection.

[0013] According to an embodiment of the utility model, the number of reinforcing beams is multiple.

[0014] According to an embodiment of the utility model, still include battery management unit assembly and connector panel assembly, the side wall of the box cover is equipped with first opening and second opening, battery management unit assembly protrudes from first opening, connector panel assembly protrudes from second opening.

[0015] According to an embodiment of the utility model, the liquid-cooled plate bottom support assembly further includes two parallelly arranged crossbeams, the crossbeams are hollow profiles, the battery cell modules are limited between the two crossbeams and are detachably connected with the crossbeams.

[0016] According to an embodiment of the utility model, further include multiple hoisting supports, the hoisting support is connected with the side of liquid-cooled plate bottom support assembly.

[0017] According to an embodiment of the utility model, the battery management unit assembly includes a bracket, a cover plate and a circuit board, the circuit board is installed on the bracket, the bracket is connected with the liquid-cooled plate, the bracket and the cover plate are made of plastic, the cover plate, the bracket and the box cover are connected by fasteners.

[0018] According to an embodiment of the utility model, the connector panel assembly includes an injection molded panel, the connector panel assembly includes an injection molded panel, two power output terminals, at least one communication interface, a fire sprinkler and a nameplate slot, the power output terminals, the communication interface, the fire sprinkler and the nameplate slot are provided on the injection molded panel, one side of the two power output terminals is provided with an identifier.

[0019] According to one embodiment of the utility model, the inside of the connector panel assembly is provided with a fuse, a copper bar and a pre-fixed screw hole position, the copper bar is connected with the pre-fixed screw hole position by a screw.

[0020] According to one embodiment of the utility model, the inside of the injection molding panel is also provided with two insulation ribs, one of the insulation ribs is arranged between the two power output terminals, and the other insulation rib is arranged between the fire sprinkler and the fuse.

[0021] The additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be known by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments and are not meant to limit the scope of the utility model. Moreover, the same reference numerals are used throughout the several drawings to designate the same or similar parts. Among them:

[0023] Figure 1 It is the whole structure schematic diagram of liquid cooling battery pack that one embodiment of the utility model proposes.

[0024] Figure 2 It is the exploded structure schematic diagram of liquid cooling battery pack that one embodiment of the utility model proposes.

[0025] Figure 3 It is the structure schematic diagram of liquid cooling plate bottom support assembly that one embodiment of the utility model relates to.

[0026] Figure 4 It is the exploded structure schematic diagram of liquid cooling plate bottom support assembly that one embodiment of the utility model relates to.

[0027] Figure 5 It is the structure schematic diagram of connector panel assembly that one embodiment of the utility model relates to.

[0028] Figure 6 It is the exploded structure schematic diagram of connector panel assembly that one embodiment of the utility model relates to.

[0029] BRIEF DESCRIPTION OF DRAWINGS:

[0030] 10 - liquid cooling plate bottom support assembly, 11 - liquid cooling plate, 12 - bottom support, 13 - crossbeam, 20 - box cover, 21 - recess, 22 - first opening, 23 - second opening, 30 - battery management unit assembly, 31 - bracket, 32 - cover plate, 40 - connector panel assembly, 50 - battery cell module, 51 - integrated busbar, 60 - hoisting bracket, 121 - outer frame, 122 - reinforcing beam, 402 - insulation rib, 403 - pre-fixing screw hole, 404 - copper bar, 405 - fuse, 406 - injection panel, 407 - power output terminal, 408 - communication interface, 409 - fire sprinkler, 411 - nameplate groove, 412 - identifier, 413 - sealing ring mounting groove. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0032] Reference is made below to Figures 1 to 6 , describing a liquid-cooled battery pack according to an embodiment of the present application.

[0033] In combination with Figures 1 to 4 , the liquid-cooled battery pack according to an embodiment of the present application includes a liquid-cooled plate bottom support assembly 10, a box cover 20 and a battery cell module 50. The liquid-cooled plate bottom support assembly 10 includes a liquid-cooled plate 11 and a bottom support 12 connected together from top to bottom, the bottom support 12 includes an outer frame 121 and a reinforcing beam 122, the reinforcing beam 122 is arranged in the outer frame 121 along a first direction, the outer frame 121 and the reinforcing beam 122 are both hollow profiles, and the outer frame 121 surrounds the bottom edge of the liquid-cooled plate 11. The battery cell module 50 is arranged on the liquid-cooled plate bottom support assembly 10. The box cover 20 is connected with the liquid-cooled plate bottom support assembly 10 to enclose the battery cell module 50.

[0034] The shape of the liquid-cooled plate 11 is selected according to actual needs. For example, the liquid-cooled plate 11 is approximately a cuboid as a whole. The liquid-cooled plate 11 and the bottom support 12 have consistent dimensions, and the liquid-cooled plate 11 and the bottom support 12 can be connected by bolt fixation, buckle fixation or the like. The liquid-cooled plate 11 has a liquid cooling channel therein, the first end and the last end of the liquid cooling channel are protruded on the top surface of the liquid-cooled plate 11 to form a liquid inlet and a liquid outlet. The liquid cooling channel is used to pass in a liquid cooling medium, and the type of the liquid cooling medium is set according to actual needs, which is not limited.

[0035] The bottom support 12 serves as a carrier for supporting the liquid cooling plate 11, the battery cell module 50 and the box cover 20. The outer frame 121 and the reinforcing beam 122 are both hollow profiles. The hollow profile is a profile with one or more closed through holes in the cross section. The material of the hollow profile can be aluminum alloy, steel, etc. The reinforcing beam 122 can be welded or threadedly connected to the opposite two edges of the outer frame 121. The number of reinforcing beams 122 can be selected according to actual needs, and can be one or more. In the example, the number of reinforcing beams 122 is three. The first direction can be the width direction of the liquid cooling plate 11 according to actual needs. The outer frame 121 and the reinforcing beam 122 can be made of the same material or different materials. The cross section of the hollow profile can be selected according to actual needs, and in the example, the cross section of the hollow profile is rectangular. The battery cell module 50 is used for storing and releasing electric energy. The battery cell module 50 includes a plurality of series-connected battery cells, and the number of battery cells is not limited according to actual needs. The specific type of the battery cell can be a cuboid according to actual needs. The battery cell module 50 includes an integrated busbar 51 to realize electrical connection and signal transmission of each battery cell. The integrated busbar is a separate module, that is, the integrated busbar is designed as a standard interface and a separate module with functions, which can improve the degree of automation and consistency of the liquid-cooled battery pack.

[0036] According to the liquid-cooled battery pack, the bottom support is arranged below the liquid cooling plate, the base includes an outer frame and a reinforcing beam, the reinforcing beam is arranged in the outer frame along a first direction, the outer frame and the reinforcing beam are both hollow profiles, and the outer frame surrounds the bottom edge of the liquid cooling plate. Thus, the number of structural members required by the bottom support is reduced, the outer frame provides a stable support boundary for the liquid cooling plate, the reinforcing beam further enhances the overall rigidity of the bottom support, the hollow profile is used as the material of the outer frame and the reinforcing beam, the weight of the entire bottom support structure is greatly reduced while ensuring sufficient strength, the structure of the outer frame and the reinforcing beam is relatively simple and easy to process, the production process can be simplified, and quality control is facilitated.

[0037] In combination with FIGS. 1-4, Figure 2 and Figure 4 In some embodiments, the liquid cooling plate 11 and the bottom support 12 are provided with connecting holes extending in the vertical direction, and the liquid cooling plate 11 and the bottom support 12 are connected by fasteners. The four edges of the box cover 20 also have connecting holes, and the fasteners sequentially pass through the box cover 20, the liquid cooling plate 11 and the bottom support 12 from top to bottom to be connected, forming a stable overall structure. When maintenance or replacement of components is required, the fasteners can be easily disassembled and reinstalled. This helps to reduce maintenance costs and time.

[0038] In order to realize the lightweight design, the box cover 20 uses an injection molding part. In order to avoid the collapse of the box cover 20, a plurality of recesses 21 extending from the left edge to the right edge are arranged on the box cover 20. The path and number of the recesses 21 are arranged according to actual needs, and are not specifically limited.

[0039] The liquid cooling plate bottom support assembly 10 further comprises two parallel cross beams 13, the cross beams 13 are hollow profiles, the battery cell module 50 is limited between the two cross beams 13 and is detachably connected with the cross beams 13. The fasteners are installed on the front and rear side walls of the battery cell module 50, and the fasteners are threadedly connected with the cross beams 13, having the advantage of easy disassembly.

[0040] In some embodiments, as shown in Figure 1 The liquid cooling battery pack further comprises a plurality of lifting brackets 60 connected with the side edges of the liquid cooling plate bottom support assembly 10. The lifting brackets 60 are used for the transfer of the liquid cooling battery pack product during the production process. The lifting brackets 60 are installed in the following manner: the fasteners sequentially pass through the lifting brackets 60, the box cover 20 and are connected with the liquid cooling plate bottom support assembly 10, forming a stable structure.

[0041] In some embodiments, as shown in Figures 1 to 6 The liquid cooling battery pack further comprises a battery management unit assembly 30 and a connector panel assembly 40. The side walls of the box cover 20 are provided with a first opening 22 and a second opening 23. The battery management unit assembly 30 protrudes from the first opening 22, and the connector panel assembly 40 protrudes from the second opening 23. The battery management unit assembly 30 has the functions of real-time monitoring, management, safety protection, communication and interaction of the battery cells. The connector panel assembly 40 has various terminals to realize the connection with the fire fighting system, the communication system and the electrical equipment.

[0042] As shown in Figure 1 The battery management unit assembly 30 comprises a bracket 31, a cover plate 32 and a circuit board. The circuit board is installed on the bracket 31, the bracket 31 is connected with the liquid cooling plate 11, and the bracket 31 and the cover plate 32 are made of plastic to realize the lightweight of the liquid cooling battery pack. The cover plate 32, the bracket 31 and the box cover 20 are connected by fasteners, and the cover plate 32 and the box cover 20 are sealed to protect the internal circuit elements and are easy to disassemble. The bracket 31 and the cover plate 32 can be used as separate modules to realize modular production and improve production efficiency.

[0043] In combination with Figure 1 , Figure 5 and Figure 6As shown, the connector panel assembly 40 comprises an injection panel 406, two power output terminals 407, at least one communication interface 408, a fire sprinkler 409 and a nameplate slot 411, the power output terminals 407, the communication interface 408, the fire sprinkler 409 and the nameplate slot 411 are arranged on the injection panel 406, one side of the two power output terminals 407 is provided with an identification symbol 412, the power output terminals 407 are used for connecting external electrical equipment, one is positive and the other is negative. The identification symbol 412 is used to mark the polarity and name of the power output terminal 407. The number of communication interfaces 408 is set according to actual needs. The injection panel 406 can realize lightweight design.

[0044] The inner side of the connector panel assembly 40 is provided with a fuse 405, a copper bar 404 and a pre-fixed screw hole 403, and the copper bar 404 is connected with the pre-fixed screw hole 403 by a screw. The fuse 405 can cut off the circuit when the current is abnormal, preventing the battery cell module 50 from being damaged. The screw can avoid the loosening of the copper bar 404 during the transfer process of the connector panel assembly 40. The inner side of the injection panel 406 is also provided with two insulating ribs 402, one of which is arranged between the two power output terminals 407, and the insulating rib 402 separates the two power output terminals 407, which can reduce the risk of short circuit of the power output terminals 407 during installation. The other insulating rib 402 is arranged between the fire sprinkler 409 and the fuse 405, so that the fuse 405 will not malfunction due to electrical interference under normal working conditions. The inner side edge of the injection panel 406 is also provided with a circle of sealing ring mounting groove 413 for mounting a sealing ring to realize sealed connection with the box cover 20.

[0045] It should be noted that in the description of the present application, the terms "first", "second" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, 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 or in communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specified. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0048] In the description of the present application, the terms "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the present application.

[0049] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions or other processes, and the various embodiments of the present application include additional implementations in which the order of execution is different, in which other code modules are utilized, in which not all code modules are utilized, in which code modules are utilized in combination with one another, and in which other structures and methods of implementation are utilized, all of which are within the scope of the present application.

[0050] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A liquid-cooled battery pack, characterized by, The application relates to a liquid-cooled plate and bottom support assembly (10) comprising a liquid-cooled plate (11) and a bottom support (12) connected together from top to bottom, wherein the bottom support (12) comprises an outer frame (121) and a reinforcing beam (122) arranged in the outer frame (121) along a first direction, and the outer frame (121) and the reinforcing beam (122) are both hollow profiles, and the outer frame (121) surrounds the bottom edge of the liquid-cooled plate (11). An electric cell module (50) is arranged on the liquid-cooled plate and bottom support assembly (10). A box cover (20) is connected with the liquid-cooled plate and bottom support assembly (10) to enclose the electric cell module (50). Connecting holes extending in a vertical direction are arranged on the liquid-cooled plate (11) and the bottom support (12), and the liquid-cooled plate (11) and the bottom support (12) are connected by fasteners.

2. The liquid-cooled battery pack of claim 1, wherein, The number of the reinforcing beams (122) is multiple.

3. The liquid-cooled battery pack of claim 1, wherein, The application further comprises a battery management unit assembly (30) and a connector panel assembly (40), and a first opening (22) and a second opening (23) are arranged on the side wall of the box cover (20), the battery management unit assembly (30) protrudes from the first opening (22), and the connector panel assembly (40) protrudes from the second opening (23).

4. The liquid-cooled battery pack of claim 1, wherein, The liquid-cooled plate and bottom support assembly (10) further comprises two parallel arranged cross beams (13), the cross beams (13) are hollow profiles, the electric cell module (50) is limited between the two cross beams (13) and detachably connected with the cross beams (13).

5. The liquid-cooled battery pack of claim 1, wherein, The application further comprises multiple lifting supports (60) connected with the side edges of the liquid-cooled plate and bottom support assembly (10).

6. The liquid-cooled battery pack of claim 1, wherein, The battery management unit assembly (30) comprises a support (31), a cover plate (32) and a circuit board, the circuit board is arranged on the support (31), the support (31) is connected with the liquid-cooled plate (11), the support (31) and the cover plate (32) are made of plastic, and the cover plate (32), the support (31) and the box cover (20) are connected by fasteners.

7. The liquid-cooled battery pack of claim 4, wherein, The connector panel assembly (40) comprises an injection molded panel (406), two power output terminals (407), at least one communication interface (408), a fire sprinkler (409) and a nameplate groove (411), the power output terminals (407), the communication interface (408), the fire sprinkler (409) and the nameplate groove (411) are arranged on the injection molded panel (406), and one side of the two power output terminals (407) is provided with an identifier (412).

8. The liquid-cooled battery pack of claim 4, wherein, The inner side of the connector panel assembly (40) is provided with a fuse (405), a copper bar (404) and a pre-fixed screw hole (403), and the copper bar (404) is connected with the pre-fixed screw hole (403) by a screw.

9. The liquid-cooled battery pack of claim 8, wherein, ​ 10. The liquid-cooled battery pack of claim 9, wherein, The inner side of the injection molded panel (406) is further provided with two insulation ribs (402), one of which is arranged between the two power output terminals (407), and the other is arranged between the fire sprinkler (409) and the fuse (405).

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