Battery pack, battery system and electric device

Abstract

The utility model provides a battery pack, a battery system and an electric device. The battery pack comprises a box body structure, a first function plate, a second function plate, an isolation beam and two battery modules, the box body structure is provided with an accommodating cavity for providing a mounting space for the battery module; the isolation beam is arranged in the containing cavity and divides the containing cavity into a first subspace and a second subspace which are arranged in the first direction. Wherein the first direction is the length direction of the battery pack. A battery module is arranged in the first subspace. And the other battery module is arranged in the second subspace. The two battery modules are arranged in the same battery pack, so that the space utilization rate on the battery rack is increased, the upper limit of the electric quantity of the whole battery system in the electric device is improved, and the performance of the battery system is optimized. Furthermore, the isolation beam can be used for separating the mounting space for the two battery modules, and also can be used for sharing the battery core expansion force borne by the box body structure, so that the service life of the battery pack is prolonged.

Description

Technical Field

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

[0002] Some electrical devices on the market require multiple battery packs to provide power. Multiple battery packs can be placed on a battery rack to form a battery system.

[0003] In the related art, the arrangement gaps between multiple battery packs are large, which affects the space utilization rate of the battery rack, limits the number of battery packs that can be installed on the battery rack, and further limits the upper limit of the power of the entire battery system in the electrical device. Utility Model Content

[0004] The present application provides a battery pack, a battery system, and an electrical device, which increase the space utilization on the battery rack, thereby increasing the upper limit of the power of the entire battery system in the electrical device and optimizing the performance of the battery system.

[0005] In a first aspect, the present application provides a battery pack comprising: a box structure, a first functional board, a second functional board, an isolation beam, and two battery modules. The box structure has a housing cavity for providing installation space for the battery module. The isolation beam is arranged in the housing cavity and divides the housing cavity into a first subspace and a second subspace arranged along a first direction. The first direction is the length direction of the battery pack. One battery module is arranged in the first subspace. Another battery module is arranged in the second subspace. The first functional board and the second functional board are respectively connected at both ends of the box structure along the first direction. A first control component and a first thermal management component are provided on the first functional board. The first control component is electrically connected to the battery module in the first subspace, and the first thermal management component is communicated with the battery module in the first subspace. A second control component and a second thermal management component are provided on the second functional board. The second control component is electrically connected to the battery module in the second subspace, and the second thermal management component is communicated with the battery module in the second subspace.

[0006] Through the first aspect, the present application separates the first subspace and the second subspace that are independent of each other in the box structure through the isolation beam, arranges one battery module in the first subspace, and arranges the other battery module in the second subspace, so that the two battery modules are arranged in the same battery pack, thereby increasing the space utilization on the battery rack, thereby increasing the upper limit of the power of the entire battery system in the electrical device, and optimizing the performance of the battery system. Furthermore, in addition to separating the installation space for the two battery modules, the isolation beam can also be used to share the battery cell expansion force borne by the box structure, thereby increasing the service life of the battery pack. Further, the first battery control component and the first thermal management component provided on the first functional board are used to ensure that the battery module in the first subspace can work independently. Similarly, the second battery control component and the second thermal management component provided on the second functional board are used to ensure that the battery module in the second subspace can work independently.

[0007] In one possible design, the battery pack may further include multiple pressure strips arranged along a first direction. The battery module may include multiple columns of module units arranged along the first direction. Each pressure strip is disposed between two adjacent columns of module units. The battery module includes a top surface and a bottom surface. The top and bottom surfaces are arranged relative to each other along a third direction, wherein the third direction is the height direction of the battery pack. All pressure strips are pressed against the top surface. The bottom surface abuts the box structure.

[0008] Based on the description of the above embodiments, the holding strips provided in the battery pack cooperate with the housing structure to fully define the freedom of the battery modules within the housing structure, significantly improving the stability of the two battery modules when installed within the housing structure. The battery pack includes multiple holding strips arranged along a first direction, each of which is positioned between two adjacent columns of module units in the battery module, enabling all module units in the battery module to be limited in the third direction.

[0009] In one possible design, the box structure may include a first side panel and a second side panel disposed opposite each other along a second direction. The second direction is the width of the battery pack. The pressure strip includes a first end and a second end disposed along the second direction. The first end is connected to the first side panel, and the second end is connected to the second side panel.

[0010] Based on the description of the above embodiments, the first end of the pressure strip is connected to the first side panel of the box structure, and the second end of the pressure strip is connected to the second side panel of the box structure, so that multiple pressure strips in the battery pack can be used to share the expansion force of the battery cells borne by the first side panel and the second side panel at any position in the first direction, thereby further improving the service life of the battery pack.

[0011] In one possible design, a buffer foam is provided between the pressure strip and the battery module.

[0012] Based on the description of the above embodiment, the buffer foam is arranged between the pressure strip and the battery module to prevent the burrs on the pressure strip from piercing the blue film of the battery cell in the battery module, thereby ensuring that the battery pack can be used normally.

[0013] In one possible design, the first end is provided with a first boss, within which a first bolt hole is provided. The first side panel is provided with a first groove, within which a first connecting hole is provided. The first boss is nested within the first groove, with the first bolt hole and the first connecting hole aligned, allowing the first end to be connected to the first side panel via bolts. The second end is provided with a second boss, within which a second bolt hole is provided. The second side panel is provided with a second groove, within which a second connecting hole is provided. The second boss is nested within the second groove, with the second bolt hole and the second connecting hole aligned, allowing the second end to be connected to the second side panel via bolts.

[0014] Based on the description of the above embodiment, the first boss and the first groove cooperate so that the first end is connected to the first side panel by bolts, while reducing the stress on the first bolt hole due to the expansion force of the battery cell, thereby ensuring the connection strength between the first end and the first side panel. Similarly, the second boss and the second groove cooperate so that the second end is connected to the second side panel by bolts, while reducing the stress on the second bolt hole due to the expansion force of the battery cell, thereby ensuring the connection strength between the second end and the second side panel. In summary, by ensuring the connection strength between the first end and the first side panel and ensuring the connection strength between the second end and the second side panel, the risk of pressure strip failure is greatly reduced.

[0015] In a possible design, metal bushings are provided in the first bolt hole, the second bolt hole, the first connecting hole, and the second connecting hole.

[0016] Based on the description of the above embodiment, the metal bushing can reduce wear on the inner walls of the first and second bolt holes during the bolt connection process, thereby ensuring the stability of the connection. Furthermore, since the box structure is generally made of aluminum profiles, the metal bushings provided in the first and second connection holes can prevent the bolts from directly threading into the aluminum profile, preventing the profile threads from drawing or slipping, thereby ensuring the stability of the connection.

[0017] In one possible design, a row of module units includes multiple battery cells arranged along a second direction. The battery cells include two surfaces disposed opposite each other in the second direction, one of which is bonded to the liquid cooling plate and the other to the aerogel.

[0018] Based on the description of the above embodiment, a liquid cooling plate and an aerogel are respectively attached to the two surfaces of the battery cell, which reduces the risk of heat diffusion caused by thermal runaway in the battery pack and reduces the production cost of the battery pack.

[0019] In a second aspect, the present application provides a battery system comprising: a battery rack and a battery pack according to any one of the above embodiments. Multiple battery packs are arranged on the battery rack. The box structure of the battery pack has a first side panel and a second side panel. The first side panel includes a first structural beam and a second structural beam arranged along a third direction. The third direction is the height direction of the battery pack. The second side panel includes a third structural beam and a fourth structural beam arranged along the third direction. The first structural beam and the third structural beam are connected to the top cover of the battery pack. The second structural beam and the fourth structural beam are connected to the battery rack.

[0020] In one possible design, the box structure includes a bottom plate for supporting the battery modules in the battery pack. The first structural beam, the second structural beam, the third structural beam, the fourth structural beam and the bottom plate are all profiled plates.

[0021] Based on the description of the above embodiments,

[0022] In a third aspect, the present application provides an electrical device, comprising: a battery system according to any one of the above embodiments, the battery system being used to provide electrical energy.

[0023] The beneficial effects of the battery system provided in the above-mentioned second aspect, the various possible designs of the above-mentioned second aspect, and the electrical device provided in the above-mentioned third aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and the various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a schematic structural diagram of a battery pack in an embodiment of the present application.

[0026] Figure 2 This is an assembly diagram of a box structure and isolation beams in an embodiment of the present application.

[0027] Figure 3 This is a structural diagram of a box structure in an embodiment of the present application.

[0028] Figure 4 This is a schematic structural diagram of a layering strip in an embodiment of the present application.

[0029] Figure 5 for Figure 4 Enlarged view of part A.

[0030] Figure 6for Figure 4 Magnified view of part B.

[0031] Figure 7 for Figure 3 Magnified view of part C.

[0032] Figure 8 for Figure 3 Magnified view of part D.

[0033] Figure 9 for Figure 1 Enlarged view of part E.

[0034] Description of reference numerals:

[0035] 100-battery pack;

[0036] 1-box structure; 1a-first subspace; 1b-second subspace; 11-first side panel; 111-first structural beam; 112-second structural beam; 12-second side panel; 121-third structural beam; 122-fourth structural beam; 13-bottom panel; 14-first groove; 15-second groove;

[0037] 2-Isolation beam;

[0038] 3-battery module; 31-module unit; 311-battery cell;

[0039] 4-pressing strip; 41-first end; 42-second end; 43-first boss; 44-second boss;

[0040] 5-first function board; 6-second function board;

[0041] 7-Liquid cooling plate; 8-Aerogel;

[0042] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0046] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0048] The directional words appearing in the following description are all directions shown in the drawings and do not limit the specific structure of this application. For example, in the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting this application.

[0049] In addition, the expressions indicating directions such as the X direction, Y direction, and Z direction used to illustrate the operation and construction of the various components of this embodiment are not absolute but relative, and although these indications are appropriate when the various components are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0050] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0051] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. "Connected" or "connected" in a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0053] An electrical appliance is an electrical device that uses electricity to perform a specific function. This includes, but is not limited to, electric bicycles, electric passenger cars, electric commercial vehicles, and electric heavy trucks. All of these devices can be powered by battery packs to meet the power needs of their respective devices.

[0054] Some electrical devices on the market require multiple battery packs to provide power. Multiple battery packs can be placed on a battery rack to form a battery system.

[0055] For example, the battery system of an electric heavy truck generally requires 8 or 10 battery packs to meet the power requirements of the electric heavy truck.

[0056] In the related art, the arrangement gaps between multiple battery packs are large, which affects the space utilization rate of the battery rack, limits the number of battery packs that can be installed on the battery rack, and further limits the upper limit of the power of the entire battery system in the electrical device.

[0057] Based on this, the present application provides a battery pack, a battery system and an electric device, which increases the space utilization on the battery rack by arranging two battery modules in the box structure of the same battery pack, thereby increasing the upper limit of the power of the entire battery system in the electric device and optimizing the performance of the battery system. Figure 1-9 Provide specific instructions.

[0058] First, as Figure 1 and Figure 2 As shown, the present application provides a battery pack 100, which may include a box structure 1, a first functional board 5, a second functional board 6, an isolation beam 2, and two battery modules 3. The box structure 1 has a receiving cavity for providing an installation space for the battery module 3. The isolation beam 2 is arranged in the receiving cavity and divides the receiving cavity into a first subspace 1a and a second subspace 1b arranged along a first direction X. The first direction X is the length direction of the battery pack 100. One battery module 3 is arranged in the first subspace 1a. Another battery module 3 is arranged in the second subspace 1b. The first functional board 5 and the second functional board 6 are respectively connected to the two ends of the box structure 1 along the first direction X. A first control component and a first thermal management component are provided on the first functional board 5. The first control component is electrically connected to the battery module 3 in the first subspace 1a, and the first thermal management component is connected to the battery module 3 in the first subspace 1a. The second function board 6 is provided with a second control component and a second thermal management component. The second control component is electrically connected to the battery module 3 in the second subspace 1b. The second thermal management component is communicated with the battery module 3 in the second subspace 1b.

[0059] The box structure 1 is a housing structure with a receiving cavity. The battery module 3 is disposed within the receiving cavity, protecting the battery module 3 from physical damage. Furthermore, the box structure 1 provides a certain degree of structural strength to withstand vibrations or impacts that the electrical device may experience. For example, if the electrical device is an electric heavy truck, the vibrations and impacts to which the truck is subjected during driving are significant.

[0060] Specifically, if Figure 2 and Figure 3 As shown, the box structure 1 may include a first side panel 11, a second side panel 12, and a bottom panel 13. The first side panel 11 and the second side panel 12 are arranged relative to each other along a second direction Y, and the bottom panel 13 is connected between the first side panel 11 and the second side panel 12, so that the first side panel 11, the second side panel 12, and the bottom panel 13 form a C-shaped structure, thereby facilitating one-time extrusion molding of the box structure 1 in a mold.

[0061] For example, the box structure 1 may be a rectangular parallelepiped, and thus the box structure 1 may have three dimensions: length, width, and height. Figure 1 It can be seen that the length is the size of the box structure 1 in the first direction X, the width is the size of the box structure 1 in the second direction Y, and the height is the size of the box structure 1 in the third direction Z.

[0062] In the related art, the box structure 1 of the battery pack 100 has only one battery module 3. In the box structure 1 of the battery pack 100 provided in the present application, two battery modules 3 are arranged along the first direction X. Therefore, the length of the box structure 1 in the present application is greater than that in the related art.

[0063] Furthermore, compared with the box structure 1 in the related art, the width and height of the box structure 1 in the present application remain unchanged, and the connection position of the box structure 1 and the battery rack in the battery system remains unchanged, so that the battery pack 100 provided in the present application has a certain degree of versatility.

[0064] Among them, Figure 2 As shown, the isolation beam 2 can be disposed in the housing cavity of the box structure 1, dividing the housing cavity into a first subspace 1a and a second subspace 1b arranged along a first direction X. Both the first subspace 1a and the second subspace 1b can be used to house the battery module 3. The battery module 3 can include multiple columns of module units 31 arranged along the first direction X. Each column of module units 31 can include multiple battery cells 311 arranged along a second direction Y. The battery cells 311 undergo a charging and discharging process, converting chemical energy into electrical energy.

[0065] In the related art, two battery modules 3 are respectively arranged in two battery packs 100. When the battery packs 100 are installed on a battery rack of a battery system, a gap of 150 mm needs to be reserved between the two battery packs 100 in the first direction X.

[0066] Based on this, the present application separates the box structure 1 into a first subspace 1a and a second subspace 1b, which are independent of each other, by using an isolation beam 2. A battery module 3 can be placed in each of the first subspace 1a and the second subspace 1b, i.e., two battery modules 3 can be placed in the same battery pack 100, shortening the distance between the two battery modules 3 to 20-30 mm. This increases the space utilization on the battery rack, thereby increasing the upper limit of the battery system's power in the electrical device and optimizing the battery system's performance.

[0067] In addition, the isolation beam 2 can be welded to the box structure 1 to ensure the stability of the connection between the isolation beam 2 and the box structure 1.

[0068] Specifically, if Figure 1 and Figure 2 As shown, the isolation beam 2 includes two ends arranged along the second direction Y, one end of which is welded to the first side plate 11 and the other end of which is welded to the second side plate 12. Furthermore, the bottom of the isolation beam 2 is welded to the bottom plate 13.

[0069] When the battery module 3 is placed in the first subspace 1a or the second subspace 1b, the first side plate 11 and the second side plate 12 are in close contact with the battery module 3, so that the first side plate 11 and the second side plate 12 provide a pre-tightening force for the battery module 3. Therefore, the expansion force of the battery cells 311 in the battery module 3 during the charge and discharge process directly acts on the first side plate 11 and the second side plate 12.

[0070] Based on this, one end of the isolation beam 2 is welded to the first side panel 11, and the other end is welded to the second side panel 12, allowing the isolation beam 2 to apply a tensile force to the first and second side panels 11, 12. The direction of this tensile force is opposite to the direction of the expansion force of the battery cells 311 of the battery module 3. Therefore, the isolation beam 2 can also be used to share the expansion force of the battery cells 311 borne by the box structure 1.

[0071] Furthermore, although the two battery modules 3 are provided in the same battery pack 100, the two battery modules 3 need to operate independently. The normal operation of the battery modules 3 requires the coordinated connection of the battery control component and the thermal management component. Therefore, the battery pack 100 provided in this application requires two sets of battery control components and thermal management components to be coordinated and connected with the two battery modules 3 respectively.

[0072] Based on this, a first function board 5 and a second function board 6 are provided on the box structure 1. The battery control assembly and thermal management assembly of one battery module 3 are provided on the first function board 5, while the battery control assembly and thermal management assembly of the other battery module 3 are provided on the second function board 6. For ease of understanding, the term "first battery control assembly" will be used to refer to the battery control assembly provided on the first function board 5, and the term "first thermal management assembly" will be used to refer to the thermal management assembly provided on the first function board 5. Similarly, the term "second battery control assembly" will be used to refer to the battery control assembly provided on the second function board 6, and the term "second thermal management assembly" will be used to refer to the thermal management assembly provided on the second function board 6.

[0073] Specifically, if Figure 1 and Figure 2As shown, the first functional board 5 and the second functional board 6 are respectively arranged at the two ends of the box structure 1 along the first direction. The first functional board 5 is directed toward the battery module 3 in the first subspace 1a, and the second functional board 6 is directed toward the battery module 3 in the second subspace 1b. This facilitates the electrical connection of the battery module 3 in the first subspace 1a with the first battery control assembly and communication with the first thermal control assembly. In addition, it facilitates the electrical connection of the battery module 3 in the second subspace 1b with the second battery control assembly and communication with the second thermal control assembly. In combination with the above content, it can be seen that the first functional board 5 and the second functional board 6 are respectively connected to the two ends of the box structure 1 along the first direction X. In addition, the first battery control assembly and the first thermal management assembly are arranged on the first functional board 5, and the second battery control assembly and the second thermal management assembly are arranged on the second functional board 6, so that the battery module 3 in the first subspace 1a and the battery module 3 in the second subspace 1b can work independently.

[0074] In summary, the present application separates the box structure 1 into a first subspace 1a and a second subspace 1b that are independent of each other through the isolation beam 2, and sets one battery module 3 in the first subspace 1a and the other battery module 3 in the second subspace 1b, so that the two battery modules 3 are set in the same battery pack 100, thereby increasing the space utilization on the battery rack, thereby increasing the upper limit of the power of the entire battery system in the electrical device and optimizing the performance of the battery system. Furthermore, in addition to separating the installation space for the two battery modules 3, the isolation beam 2 can also be used to share the expansion force of the battery cells 311 borne by the box structure 1, thereby increasing the service life of the battery pack 100. Furthermore, the first battery control component and the first thermal management component set on the first functional board 5 are used to ensure that the battery module 3 in the first subspace 1a can work independently. Similarly, the second battery control component and the second thermal management component set on the second functional board 6 are used to ensure that the battery module 3 in the second subspace 1b can work independently.

[0075] Furthermore, in order to improve the stability of the two battery modules 3 installed in the box structure 1, the present application also makes the following designs:

[0076] like Figure 1 As shown, in some embodiments, the battery pack 100 may further include a plurality of pressure strips 4 arranged along a first direction X. The battery module 3 may include a plurality of columns of module units 31 arranged along the first direction X. Each pressure strip 4 is disposed between two adjacent columns of module units 31. The battery module 3 includes a top surface and a bottom surface. The top surface and the bottom surface are arranged relative to each other along a third direction Z. The third direction Z is the height direction of the battery pack 100. All pressure strips 4 are pressed against the top surface. The bottom surface abuts against the box structure 1.

[0077] According to the above content, the first side plate 11 and the second side plate 12 in the box structure 1 are used to pre-position the two battery modules 3. Figure 1 It can be seen that the first side plate 11 and the second side plate 12 limit the two battery modules 3 in the first direction X and the second direction Y.

[0078] From the above content, it can be seen that the battery module 3 still lacks a limit in the third direction Z. Figure 1 As shown, the third direction Z is the height direction of the battery pack 100 , and is also the height direction of the battery module 3 . The battery module 3 has a top surface and a bottom surface that are relatively arranged in the third direction Z.

[0079] Based on this, the bottom surface of the battery module 3 abuts against the bottom plate 13 of the box structure 1, which is used to restrict the movement of the battery module 3 toward the bottom surface. The pressure strip 4 presses against the top surface of the battery module 3 along the third direction Z, restricting the movement of the battery module 3 toward the top surface. Combined with the above, it can be seen that the pressure strip 4 and the box structure 1 cooperate to achieve the limitation of the battery module 3 in the third direction Z.

[0080] It can be seen that the freedom of the battery module 3 in the box structure 1 is completely defined by the first side panel 11, the second side panel 12, the bottom panel 13 and the pressure strip 4, which greatly improves the stability of the installation of the two battery modules 3 in the battery pack 100.

[0081] Specifically, the battery module 3 may include multiple columns of module units 31 arranged along the first direction X. Therefore, the battery pack 100 may include multiple holding bars 4 arranged along the first direction X. Furthermore, each holding bar 4 is disposed between two adjacent columns of module units 31, so that each column of module units 31 in the battery module 3 can be tightly pressed by the holding bar 4, thereby enabling all module units 31 in the battery module 3 to be limited in position in the third direction Z.

[0082] According to the description of the above embodiment, the holding strips 4 provided in the battery pack 100 cooperate with the housing structure 1 to fully define the degrees of freedom of the battery modules 3 within the housing structure 1, significantly improving the stability of the installation of the two battery modules 3 within the housing structure 1. The battery pack 100 includes multiple holding strips 4 arranged along the first direction X, with each holding strip 4 positioned between two adjacent columns of module units 31 in the battery module 3. This allows all module units 31 in the battery module 3 to be constrained in the third direction Z.

[0083] Based on the above content and taking into account the structural strength of the box structure 1, the present application may further define the connection method of the above-mentioned pressure strips 4 in the box structure 1:

[0084] In some embodiments, the box structure 1 may include a first side panel 11 and a second side panel 12 disposed opposite each other along a second direction Y. The second direction Y is the width of the battery pack 100. The holding strip 4 includes a first end 41 and a second end 42 disposed along the second direction Y. The first end 41 is connected to the first side panel 11. The second end 42 is connected to the second side panel 12.

[0085] like Figure 3 、 Figure 4 and Figure 5 As shown, the holding strip 4 includes a first end 41 and a second end 42 arranged along the second direction Y. The first end 41 is connected to the first side panel 11, and the second end 42 is connected to the second side panel 12. This allows the holding strip 4 to exert a tensile force on the first and second side panels 11, 12. The direction of this tensile force is opposite to the direction of the expansion force of the battery cells 311 of the battery module 3. Therefore, the holding strip 4 can also be used to share the expansion force of the battery cells 311 borne by the box structure 1.

[0086] The expansion force of the battery cell 311 and the direction of the expansion force of the battery cell 311 have been explained above and will not be repeated here.

[0087] In addition, since the first side plate 11 and the second side plate 12 have lengths in the first direction X, any position of the first side plate 11 and the second side plate 12 in the first direction X bears the expansion force of the battery cell 311 .

[0088] Based on this, the battery pack 100 may further include multiple beadings 4 arranged along the first direction X. The greater the number of beadings 4, the greater the number of first ends 41 and second ends 42. Therefore, the battery pack 100 may include multiple first connection points where the first end 41 connects to the first side panel 11. All first connection points may be evenly distributed along the first direction X on the first side panel 11, allowing the multiple beadings 4 to distribute the expansion force of the battery cells 311 at any position on the first side panel 11 in the first direction X.

[0089] Similarly, the battery pack 100 may include multiple second connection points where the second end 42 is connected to the second side panel 12. All second connection points may be evenly distributed on the second side panel 12 along the first direction X, so that the multiple holding strips 4 are used to distribute the expansion force of the battery cells 311 at any position of the second side panel 12 in the first direction X.

[0090] According to the description of the above embodiment, the first end 41 of the pressure strip 4 is connected to the first side panel 11 of the box structure 1, and the second end 42 of the pressure strip 4 is connected to the second side panel 12 of the box structure 1, so that the multiple pressure strips 4 in the battery pack 100 can be used to share the expansion force of the battery cell 311 borne by the first side panel 11 and the second side panel 12 at any position in the first direction X, thereby further improving the service life of the battery pack 100.

[0091] It should be noted that the holding strip 4 in the above embodiment needs to have a high tensile strength to prevent the holding strip 4 from being broken or damaged due to sharing the expansion force of the battery cells 311 borne by the box structure 1 .

[0092] Based on the above description, materials with high tensile strength are generally hard materials, which may cause burrs on the surface of the bead 4. The burrs directly contact the battery module 3, causing the blue film of the battery cell in the battery module 3 to be punctured, thereby affecting the normal use of the battery pack 100. In order to solve the above problems, the present application also makes the following improvements:

[0093] In some embodiments, a buffer foam is provided between the pressure strip 4 and the battery module 3 .

[0094] According to the description of the above embodiment, the buffer foam is arranged between the pressure strip 4 and the battery module 3 to prevent the burrs on the pressure strip 4 from piercing the blue film of the battery cell in the battery module 3, thereby ensuring that the battery pack 100 can be used normally.

[0095] Specifically, a first bolt hole is formed on the first end 41 of the pressure strip 4, so that the first end 41 can be connected to the first side panel 11 by bolts. Similarly, a second bolt hole is formed on the second end 42 of the pressure strip 4, so that the second bolt hole can be connected to the second side panel 12 by bolts.

[0096] Considering that the thickness range of the pressure strip 4 is only 3-6 mm, when the expansion force of the battery cell 311 increases with the increase in the number of charge and discharge cycles, the first bolt hole and the second bolt hole directly bear the stress brought by the expansion force of the battery cell 311, which may cause the first bolt hole and / or the second bolt hole to rupture, so that the above two bolt connections are at risk of failure, thereby causing the pressure strip 4 to fail.

[0097] Based on the above, in order to ensure the structural strength of the two bolt connections, the battery pack 100 in this application can also be improved as follows:

[0098] like Figure 5-Figure 8 As shown, in some embodiments, the first end 41 is provided with a first boss 43, and a first bolt hole is provided in the first boss 43. The first side plate 11 is provided with a first groove 14, and a first connecting hole is provided in the first groove 14. The first boss 43 is nested in the first groove 14, and the first bolt hole and the first connecting hole are aligned, so that the first end 41 is connected to the first side plate 11 by bolts. The second end 42 is provided with a second boss 44, and a second bolt hole is provided in the second boss 44. The second side plate 12 is provided with a second groove 15, and a second connecting hole is provided in the second groove 15. The second boss 44 is nested in the second groove 15, and the second bolt hole and the second connecting hole are aligned, so that the second end 42 is connected to the second side plate 12 by bolts.

[0099] Specifically, a first bolt hole is provided within the first boss 43, and a first connection hole corresponding to the first bolt hole is provided within the first recess 14. When the first boss 43 is nested within the first recess 14, the first bolt hole and the first connection hole align, allowing a bolt to pass through both holes simultaneously, thereby securing the first end 41 to the first side panel 11. At this point, the stress caused by the expansion force of the battery cell 311 is applied to the first boss 43 and the first recess 14, reducing the stress on the first bolt hole and the risk of cracking. This ensures the connection strength between the first end 41 and the first side panel 11, thereby minimizing the risk of failure of the holding strip 4.

[0100] Similarly, a second bolt hole is provided within the second boss 44, and a second connection hole corresponding to the second bolt hole is provided within the second groove 15. When the second boss 44 is nested within the second groove 15, the second bolt hole and the second connection hole align, allowing a bolt to pass through both holes simultaneously, thereby securing the second end 42 to the second side plate 12. At this point, the stress caused by the expansion force of the battery cell 311 is applied to the second boss 44 and the second groove 15, reducing the stress on the second bolt hole and the risk of cracking. This ensures the connection strength between the second end 42 and the second side plate 12, thereby minimizing the risk of failure of the holding strip 4.

[0101] In addition, the first boss 43 is nested in the first groove 14 to pre-position the connection position between the first end 41 and the first side panel 11, facilitating the simultaneous entry of the bolt into the first bolt hole and the first connection hole, thereby improving the convenience of connecting the first end 41 to the first side panel 11. Similarly, the second boss 44 is nested in the second groove 15 to pre-position the connection position between the second end 42 and the second side panel 12, facilitating the simultaneous entry of the bolt into the second bolt hole and the second connection hole, thereby improving the convenience of connecting the second end 42 to the second side panel 12.

[0102] According to the description of the above embodiment, the first boss 43 and the first groove 14 cooperate to connect the first end 41 to the first side plate 11 via bolts while reducing the stress on the first bolt hole due to the expansion force of the battery cell 311, thereby ensuring the connection strength between the first end 41 and the first side plate 11. Similarly, the second boss 44 and the second groove 15 cooperate to connect the second end 42 to the second side plate 12 via bolts while reducing the stress on the second bolt hole due to the expansion force of the battery cell 311, thereby ensuring the connection strength between the second end 42 and the second side plate 12. In summary, by ensuring the connection strength between the first end 41 and the first side plate 11 and the connection strength between the second end 42 and the second side plate 12, the risk of failure of the pressure strip 4 is greatly reduced.

[0103] Furthermore, the outer edges of the first boss 43 in contact with the bead 4 are chamfered to reduce the shear force on the first boss 43 and further improve the connection strength between the first end 41 and the first side panel 11. Similarly, the outer edges of the second boss 44 in contact with the bead 4 are chamfered to reduce the shear force on the second boss 44 and further improve the connection strength between the second end 42 and the second side panel 12.

[0104] Furthermore, in some embodiments, metal bushings are provided in the first bolt hole, the second bolt hole, the first connecting hole, and the second connecting hole.

[0105] Specifically, the metal bushing can be disposed in the first bolt hole, the second bolt hole, the first connecting hole, and the second connecting hole by integrally packaging.

[0106] According to the description of the above embodiment, the metal bushing can reduce wear on the inner walls of the first and second bolt holes during the bolt connection process, thereby ensuring the stability of the connection. Furthermore, since the box structure 1 is generally made of aluminum profiles, the metal bushings provided in the first and second connection holes can prevent the bolts from directly threading into the aluminum profile, thereby preventing the profile threads from drawing or slipping, thereby ensuring the stability of the connection.

[0107] Furthermore, taking into account the cooling problem and cost issues of the battery module 3, the present application also makes the following designs:

[0108] like Figure 9 As shown, in some embodiments, a row of module units 31 includes a plurality of battery cells 311 arranged along the second direction Y. The battery cell 311 includes two surfaces arranged opposite to each other in the second direction Y. One surface is in contact with the liquid cooling plate 7, and the other surface is in contact with the aerogel 8.

[0109] Specifically, the number of battery cells 311 in multiple columns of module units 31 in the battery module 3 is the same. For example, a column of module units 31 includes 10 battery cells 311 arranged along the second direction Y. One side of each battery cell 311 is bonded to a cold plate, and the other side of each battery cell 311 is bonded to a layer of aerogel 8. It should be noted that two adjacent battery cells 311 can share a cold plate and / or a layer of aerogel 8.

[0110] The aerogel 8 can delay the occurrence of thermal runaway, reducing the risk of heat diffusion caused by thermal runaway in the battery pack 100. Furthermore, the aerogel 8 is inexpensive, further reducing the production cost of the battery pack 100.

[0111] Furthermore, the battery pack 100 provided in the present application is provided with two battery modules 3, and the two battery modules 3 are respectively provided with independent liquid cooling plates 7, so that the liquid cooling plate 7 of one battery module 3 is connected to the first thermal management component provided on the first end 41 plate to achieve heat exchange between the above-mentioned battery module 3 and the external environment. Similarly, the liquid cooling plate 7 of the other battery module 3 is connected to the second thermal management component provided on the second end 42 plate to achieve heat exchange between the above-mentioned battery module 3 and the external environment. In combination with the above content, it can be seen that both battery modules 3 in the battery pack 100 can achieve heat transfer through the liquid cooling plate 7, thereby further reducing the risk of heat diffusion caused by thermal runaway in the battery pack 100.

[0112] According to the description of the above embodiment, the liquid cooling plate 7 and the aerogel 8 are respectively attached to the two surfaces of the battery cell 311, which reduces the risk of heat diffusion caused by thermal runaway in the battery pack 100 and reduces the production cost of the battery pack 100.

[0113] In a second aspect, a battery system includes a battery rack and a battery pack 100 according to any one of the above embodiments. A plurality of battery packs 100 are arranged on the battery rack. The box structure 1 of the battery pack 100 has a first side panel 11 and a second side panel 12. The first side panel 11 includes a first structural beam 111 and a second structural beam 112 arranged along a third direction Z. The third direction Z is the height direction of the battery pack 100. The second side panel 12 includes a third structural beam 121 and a fourth structural beam 122 arranged along the third direction Z. The first structural beam 111 and the third structural beam 121 are connected to the top cover of the battery pack 100. The second structural beam 112 and the fourth structural beam 122 are connected to the battery rack.

[0114] Further, if Figure 3 As shown, in some embodiments, the box structure 1 includes a bottom plate 13, which is used to support the battery module 3 in the battery pack 100. The first structural beam 111, the second structural beam 112, the third structural beam 121, the fourth structural beam 122 and the bottom plate 13 are all profile plates.

[0115] Specifically, the profile plate includes a plurality of cavities. Compared with a solid plate, the profile plate of the same volume requires less material and has a lower cost.

[0116] According to the description of the above embodiment, the first structural beam 111, the second structural beam 112, the third structural beam 121, the fourth structural beam 122 and the bottom plate 13 in the box structure 1 are all profile plates, which can reduce the production cost of the battery pack 100-pole battery system.

[0117] In a third aspect, an electrical device includes a battery system according to any one of the above embodiments, wherein the battery system is configured to provide electrical energy. Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not others, the combination of features from different embodiments is intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0118] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: Box structure, first functional board, second functional board, isolation beam and two battery modules; The box structure has a receiving cavity for providing an installation space for the battery module; The isolation beam is arranged in the accommodating cavity and divides the accommodating cavity into a first subspace and a second subspace arranged along a first direction; Wherein, the first direction is the length direction of the battery pack; A battery module is arranged in the first subspace; Another battery module is arranged in the second subspace; The first functional board and the second functional board are respectively connected to two ends of the box structure along the first direction; The first functional board is provided with a first control component and a first thermal management component, the first control component is electrically connected to the battery module in the first subspace, and the first thermal management component is in communication with the battery module in the first subspace; The second function board is provided with a second control component and a second thermal management component. The second control component is electrically connected to the battery module in the second subspace, and the second thermal management component is in communication with the battery module in the second subspace.

2. The battery pack according to claim 1, wherein: It may also include a plurality of press strips arranged along the first direction; The battery module may include a plurality of columns of module units arranged along the first direction; Each of the pressure strips is arranged between two adjacent rows of module units; The battery module includes a top surface and a bottom surface; The top surface and the bottom surface are arranged opposite to each other along a third direction; Wherein, the third direction is the height direction of the battery pack; All of the layering strips are pressed tightly against the top surface; The bottom surface abuts against the box structure.

3. The battery pack according to claim 2, wherein: The box structure may include a first side plate and a second side plate arranged opposite to each other along a second direction; Wherein, the second direction is the width direction of the battery pack; The press strip includes a first end and a second end arranged along the second direction; The first end is connected to the first side panel; The second end is connected to the second side plate.

4. The battery pack according to claim 3, wherein: Buffer foam is provided between the pressure strip and the battery module.

5. The battery pack according to claim 3, characterized in that: The first end is provided with a first boss, and the first boss is provided with a first bolt hole; A first groove is provided on the first side plate, and a first connecting hole is provided in the first groove; The first boss is nested in the first groove, the first bolt hole is aligned with the first connecting hole, and the first end is connected to the first side plate by a bolt; The second end is provided with a second boss, and the second boss is provided with a second bolt hole; A second groove is provided on the second side plate, and a second connecting hole is provided in the second groove; The second boss is nested in the second groove, and the second bolt hole is aligned with the second connecting hole, so that the second end is connected to the second side plate by a bolt.

6. The battery pack according to claim 5, characterized in that: Metal bushings are provided in the first bolt hole, the second bolt hole, the first connecting hole and the second connecting hole.

7. The battery pack according to any one of claims 3 to 6, characterized in that: A row of the module units includes a plurality of battery cells arranged along the second direction; The battery cell includes two surfaces arranged opposite to each other in the second direction; One side is bonded to the liquid cooling plate, and the other side is bonded to the aerogel.

8. A battery system, characterized in that: comprising a battery rack and a battery pack according to any one of claims 1 to 7; The plurality of battery packs are arranged on the battery rack; The box structure of the battery pack has a first side plate and a second side plate; The first side plate includes a first structural beam and a second structural beam arranged along a third direction; Wherein, the third direction is the height direction of the battery pack; The second side plate includes a third structural beam and a fourth structural beam arranged along the third direction; The first structural beam and the third structural beam are connected to the top cover of the battery pack; The second structural beam and the fourth structural beam are connected to the battery rack.

9. The battery system according to claim 8, characterized in that The box structure includes a bottom plate, which is used to support the battery modules in the battery pack; The first structural beam, the second structural beam, the third structural beam, the fourth structural beam and the bottom plate are all profile plates.

10. An electrical device, characterized in that: The battery system comprises the battery system according to any one of claims 8 to 9, wherein the battery system is used to provide electrical energy.

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