Battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and electric equipment. The battery pack comprises a fixed column, a fixed part and a plurality of modules; the plurality of modules are stacked in a first direction; the fixing column extends in the first direction, the fixing column sequentially penetrates through the multiple modules, and the fixing piece is connected with the end of the fixing column so as to fix the multiple modules. According to the battery pack and the electric equipment, the problem of insufficient strength and rigidity after a plurality of standard modules are fixed and grouped in an existing battery pack structure is solved.

Description

TECHNICAL FIELD

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

[0002] It is known that, in terms of reducing carbon emissions, electric vehicle technology is widely regarded as an effective solution, and one of the three cores of electric vehicle technology is power battery pack technology. With the rapid development of power battery pack technology, various battery packs have been researched, from standard module assembled battery packs, to CTP solutions, and short knife, long knife LCTP solutions, CTC solutions, to double-sided cooling, three-sided cooling and other solutions. A battery pack in the prior art is composed of multiple standard modules stacked in the same direction to assemble a long strip-shaped battery pack. This battery pack is suitable for assembly and cooling.

[0003] However, the strength and rigidity of the multiple standard modules fixed into a group in the structure of the existing battery pack are insufficient. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a battery pack and an electric device, thereby solving the problem of insufficient strength and rigidity of multiple standard modules fixed into a group in the structure of the existing battery pack.

[0005] According to a first aspect of the present application, a battery pack is provided, comprising a fixing column, a fixing member and multiple modules; the multiple modules are stacked in a first direction; the fixing column extends along the first direction, and the fixing column sequentially passes through the multiple modules, and the fixing member is connected with the end of the fixing column to fix the multiple modules.

[0006] In any of the above technical solutions, further, the fixing column is a threaded column, and the fixing member is a nut; the number of the fixing column is one, and the number of the fixing member is two; the fixing column sequentially passes through the middle part of the multiple modules, and the two fixing members are respectively threadedly connected with the two ends of the fixing column to lock the multiple modules.

[0007] In any of the above technical solutions, further, the module comprises a positive electrode cell support, a negative electrode cell support and a plurality of cylindrical cells; the positive electrode cell support comprises a first bottom wall and a first enclosing wall arranged along the edge of the first bottom wall, the first bottom wall and the first enclosing wall form a first containing space; the negative electrode cell support comprises a second bottom wall and a second enclosing wall arranged along the edge of the second bottom wall, the second bottom wall and the second enclosing wall form a second containing space; the positive electrode cell support and the negative electrode cell support can be contacted so that the first containing space and the second containing space jointly contain a plurality of cylindrical cells; a plurality of cylindrical cells are arranged in an array, the cylindrical cells extend along the first direction, the first bottom wall and the second bottom wall are respectively provided with first mounting through holes and second mounting through holes for mounting the cylindrical cells; the middle part of the first bottom wall and the second bottom wall are respectively provided with through holes for penetrating the fixing column.

[0008] In any of the above technical solutions, further, the module further comprises a positive bus bar, a positive connecting lug, a negative bus bar and a negative connecting lug; the positive bus bar is arranged on one side of the first bottom wall, the positive bus bar is provided with a plurality of first welding points adapted to a plurality of cylindrical cells, the first welding points are welded with corresponding cylindrical cells through the first mounting through hole, and the positive connecting lug is connected with the positive bus bar; the negative bus bar is arranged on one side of the second bottom wall, the negative bus bar is provided with a plurality of second welding points adapted to a plurality of cylindrical cells, the second welding points are welded with corresponding cylindrical cells through the second mounting through hole, and the negative connecting lug is connected with the negative bus bar; the positive bus bar and the negative bus bar are both formed with an avoiding space for penetrating the fixing column.

[0009] In any of the above technical solutions, further, the module further comprises a positive electrode collecting plate and a negative electrode collecting plate; the positive electrode collecting plate is arranged on the side of the positive electrode busbar opposite to the first bottom wall, and a plurality of first collecting pieces corresponding to the plurality of first welding points are arranged on the positive electrode collecting plate, and the first collecting pieces are welded with the corresponding first welding points; the positive electrode collecting plate is further provided with a positive electrode low-voltage collecting interface; and / or, the positive electrode collecting plate is provided with a positive electrode temperature sensing piece, and the positive electrode temperature sensing piece is attached to the positive electrode busbar; the negative electrode collecting plate is arranged on the side of the negative electrode busbar opposite to the second bottom wall, and a plurality of second collecting pieces corresponding to the plurality of second welding points are arranged on the negative electrode collecting plate, and the second collecting pieces are welded with the corresponding second welding points; the negative electrode collecting plate is further provided with a negative electrode low-voltage collecting interface; and / or, the negative electrode collecting plate is provided with a negative electrode temperature sensing piece, and the negative electrode temperature sensing piece is attached to the negative electrode busbar; the middle part of the positive electrode collecting plate and the negative electrode collecting plate are both provided with a through hole for the fixing column to pass through.

[0010] In any of the above technical solutions, further, the positive electrode cell support and the negative electrode cell support are both polygonal prism structures; and / or, the positive electrode busbar, the negative electrode busbar, the positive electrode collecting plate and the negative electrode collecting plate are all polygonal structures; the positive electrode busbar, the negative electrode busbar, the positive electrode collecting plate and the negative electrode collecting plate are arranged in alignment with the polygonal prism structure; the number of sides of the polygonal prism structure and the number of sides of the polygonal structure are both N.

[0011] In any of the above technical solutions, further, the positive electrode connecting lug and the negative electrode connecting lug are both located on the first side of the combined polygonal prism structure, and the positive electrode low-voltage collecting interface and the negative electrode low-voltage collecting interface are both located on any one side of the other side of the combined polygonal prism structure.

[0012] In any of the above technical solutions, further, the battery pack further comprises a plurality of separators; the separators are arranged between any two adjacent modules, and the middle part of the separator is provided with a through hole for the fixing column to pass through.

[0013] In any of the above technical solutions, further, the battery pack further comprises an end plate; among the plurality of modules, the outer sides of the two modules located at both ends are sequentially provided with the separators and the end plates, and the end plates are provided with through holes for the fixing columns to pass through.

[0014] According to the second aspect of the present application, a power consuming device is provided, which comprises the battery pack as described above.

[0015] The battery pack of the present application comprises a fixing column, a fixing member and a plurality of modules. The plurality of modules are arranged in a stack in a first direction; the fixing column extends along the first direction, the fixing column sequentially passes through the plurality of modules, and the fixing member is connected with the end of the fixing column to fix the plurality of modules.

[0016] According to the above technical features, the present application has the following advantages:

[0017] The battery pack of the present application assembles the plurality of module assemblies together through the assembly structure of the long fixing column and the fixing member, improves the overall rigidity of the module assembly, and forms a high-strength and high-rigidity assembly body.

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 The overall structure schematic diagram of the module of the embodiment of the present application is shown;

[0021] Figure 2 The assembly structure schematic diagram of the battery pack of the embodiment of the present application is shown;

[0022] Figure 3 The side view of Figure 2 is shown;

[0023] Figure 4 The structure schematic diagram after installing the first high-voltage bus, the second high-voltage bus and the connecting wire is shown. Figure 3

[0024] Figure legend: 100-module; 110-positive electrode core support; 120-negative electrode core support; 121-second bottom wall; 122-second surrounding wall; 1211-second mounting through hole; 130-cylindrical core; 140-positive electrode bus bar; 141-positive electrode connecting lug; 150-negative electrode bus bar; 151-negative electrode connecting lug; 152-Ba sheet; 160-positive electrode collection plate; 161-positive electrode low-voltage collection interface; 170-negative electrode collection plate; 171-negative electrode low-voltage collection interface; 200-fixing column; 300-fixing member; 400-separation plate; 500-end plate; 600-connecting wire; 700-first high-voltage bus; 800-second high-voltage bus; X-first direction. ​DETAILED DESCRIPTION

[0025] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and thus particular embodiments described herein are not intended as being exhaustive of what the present disclosure can provide. For example, although processes are described with regard to particular operational flows, various changes can be made within the scope of the present disclosure. For example, the order of operations can be changed, or certain operations can be performed in parallel. In addition, for the sake of brevity and clarity, some features of the description including features known in the art can not be described.

[0026] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these described examples have been provided for illustrative purposes so that those skilled in the art will be able to implement the methods, apparatuses, and / or systems described herein in a variety of ways.

[0027] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," "directly adjacent to," "directly on top of," or "directly covering" another element, there are no other elements interposed therebetween.

[0028] As used herein, the term "and / or" includes any one of the listed items and any combination of two or more of the listed items.

[0029] Although terms such as "first," "second," and "third" can be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the element, component, region, layer, or section referred to as the first element, component, region, layer, or section in the examples described herein can also be referred to as the second element, component, region, layer, or section without departing from the teachings of the examples.

[0030] For ease of description, spatially relative terms, such as "on", "upper", "lower", "above", and "below", can be used herein for the purpose of illustrating one element's relationship to another element in the drawings. Such spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientations depicted in the drawings. For example, if the device in the drawings is turned over, elements described as being "on" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the term "on" can encompass both an "on" and "below" orientation. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms (i.e., the terms do not exclude the presence of other elements or steps). The term "coupled" as used herein is intended to mean physically, logically, or communicatively coupled or linked, unless otherwise indicated.

[0032] Variations in shapes that are shown in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings, but include variations in shapes that occur as a result of manufacturing processes and / or tolerances.

[0033] Features of the examples described herein can be combined with each other as various combinations according to an understanding of the disclosure after the disclosure is understood. Also, although the examples described herein have various configurations, other configurations are possible as will be apparent after the disclosure is understood.

[0034] The first aspect of the present application provides a battery pack, thereby solving the problem that the strength and rigidity of a plurality of standard modules fixed into a group are insufficient. The following refers to the accompanying drawings to describe the battery pack according to some embodiments of the present application. Figures 1 to 4 The battery pack described in some embodiments of the present application is described.

[0035] As shown in Figure 2 The battery pack of the present application includes a fixing column 200, a fixing member 300, and a plurality of modules 100. The plurality of modules 100 are arranged in a stack in a first direction X; the fixing column 200 extends along the first direction X, the fixing column 200 sequentially passes through the plurality of modules 100, and the fixing member 300 is connected to the end of the fixing column 200 to fix the plurality of modules 100.

[0036] That is, the battery pack of the present application assembles multiple module assemblies 100 together through the assembly structure of one long fixing column 200 and fixing member 300, improves the overall rigidity of the module assembly 100, and makes multiple modules 100 form a high-strength and high-rigidity assembly body.

[0037] In the embodiment of the present application, as an example, the fixing column 200 can be a screw, and the fixing member 300 can be a nut. During assembly, the screw passes through the middle part of multiple modules 100 in sequence, and the nut is connected with one end of the screw (connected with the end of the screw without a nut) to lock multiple modules 100. In this way, the assembly is convenient, and the overall rigidity and overall strength of the module assembly 100 are high.

[0038] As another example, as shown in Figure 2 , preferably, the fixing column 200 can be a threaded column, the fixing member 300 can be a nut, and the fixing member 300 can be two. During assembly, the threaded column passes through the middle part of multiple modules 100 in sequence, and the two nuts are respectively threadedly connected with both ends of the threaded column to lock multiple modules 100. In this way, the assembly is convenient, and the overall rigidity and overall strength of the module assembly 100 are high.

[0039] In the embodiment of the present application, in order to further improve the overall rigidity and overall strength of the module assembly 100, as shown in Figure 2 , the battery pack of the present application further comprises multiple partitions 400. Each module 100 is provided with a partition 400 on each side opposite to each other in the first direction X, the partition 400 is a hexagonal structure, and the partition 400 is arranged in alignment with the hexagonal prism structure of the module, and the middle part of the partition 400 is provided with a through hole for the fixing column 200 to pass through. In this way, the partition 400 is arranged in the middle of each module 100, which not only can further improve the overall rigidity and overall strength of the module assembly 100, but also can provide insulation and isolation protection, and in addition, when the battery cell in a certain module 100 is in thermal runaway, it can also play a heat insulation function, thereby improving the safety of the entire module assembly 100.

[0040] In the embodiment of the present application, in order to further improve the overall rigidity and overall strength of the module assembly 100, as shown in Figure 2 , the battery pack of the present application further comprises two end plates 500; among multiple modules 100, the outermost sides of the two modules 100 located at both ends are respectively provided with an end plate 500, and the end plate 500 is provided with a through hole for the fixing column 200 to pass through. In this way, the present application assembles multiple module assemblies 100 together through the assembly structure of one long fixing column 200, two fixing members 300, multiple partitions 400, and two end plates 500 on both sides, thereby further improving the overall rigidity and overall strength of the module assembly 100.

[0041] The following will be describedFigure 1 The module 100 described in some embodiments of the present application is described.

[0042] As shown in Figure 1 The module 100 of the present application includes a positive electrode core support 110, a negative electrode core support 120, and a plurality of cylindrical cores 130. Among them, the positive electrode core support 110 includes a first bottom wall and a first surrounding wall arranged along the edge of the first bottom wall, and the first bottom wall and the first surrounding wall form a first containing space; the negative electrode core support 120 includes a second bottom wall 121 and a second surrounding wall 122 arranged along the edge of the second bottom wall 121, and the second bottom wall 121 and the second surrounding wall 122 form a second containing space; the positive electrode core support 110 and the negative electrode core support 120 can be docked so that the first containing space and the second containing space collectively contain a plurality of cylindrical cores 130; the plurality of cylindrical cores 130 are arranged in an array, the cylindrical cores 130 extend along a first direction X, and the first bottom wall and the second bottom wall 121 are respectively provided with first mounting through holes and second mounting through holes 1211 for mounting the cylindrical cores 130; The middle part of the first bottom wall and the second bottom wall 121 is provided with a through hole for penetrating the fixing column 200.

[0043] Further, in the embodiments of the present application, the module 100 further includes a positive bus bar 140, a positive connection lug 141, a negative bus bar 150, and a negative connection lug 151. Among them, the positive bus bar 140 is arranged on one side of the first bottom wall, and the positive bus bar 140 is provided with a plurality of first welding points adapted to the plurality of cylindrical cores 130, the first welding points are welded with the corresponding cylindrical cores 130 through the first mounting through hole, and the positive connection lug 141 is connected with the positive bus bar 140. Similarly, the negative bus bar 150 is arranged on one side of the second bottom wall 121, and the negative bus bar 150 is provided with a plurality of second welding points adapted to the plurality of cylindrical cores 130, the second welding points are welded with the corresponding cylindrical cores 130 through the second mounting through hole, and the negative connection lug 151 is connected with the negative bus bar 150; The middle part of the positive bus bar 140 and the negative bus bar 150 forms an avoiding space for penetrating the fixing column 200.

[0044] In the embodiments of the present application, as shown in Figure 1 As an example, the positive electrode core support 110 and the negative electrode core support 120 are hexagonal prism structures, the cylindrical cores 130 are stacked and placed along the radial direction, and a single module 100 is formed according to the specified series-parallel connection rule. As an example, the series-parallel connection rule of the single module 100 of the present application is 6P15S (6 cylindrical cores 130 form a group, and there are 15 groups in total), and the single module 100 is selected as a hexagonal prism structure.

[0045] Furthermore, the corresponding positive bus 140 and negative bus 150 are also hexagonal structures, and the positive bus 140 and negative bus 150 connect 15 sets of cylindrical cells 130 in series.

[0046] As an example, such as Figure 1 As shown, the positive busbar 140 is provided with multiple tabs, each tab being arched and including two first welding points at both ends. A group of three parallel tabs corresponds to a group of six cylindrical cells 130. Similarly, the negative busbar 150 is provided with multiple tabs 152, each tab being arched and including two second welding points at both ends. A group of three parallel tabs 152 corresponds to a group of six cylindrical cells 130.

[0047] In this application, the positive and negative terminals of each pair of adjacent cylindrical cells 130 are reversed. Fifteen sets of terminals on the positive bus 140 and fifteen sets of terminals on the negative bus 150 connect the positive and negative terminals of the 15 cylindrical cells 130 in series. Specifically, the positive terminal connector 141 is connected to the first set of terminals on the positive bus 140 (the first set of terminals among the fifteen, i.e., the terminal welded to the first set of the fifteen cylindrical cells 130; this set of terminals is the positive terminal). Similarly, the negative terminal connector 151 is connected to the last set of terminals on the negative bus 150 (the last set of terminals among the fifteen, i.e., the terminal welded to the last set of the fifteen cylindrical cells 130; this set of terminals is the negative terminal).

[0048] Furthermore, in the embodiments of this application, such as Figure 1 As shown, module 100 also includes a positive electrode acquisition plate 160 and a negative electrode acquisition plate 170. The positive electrode acquisition plate 160 is disposed on the side of the positive electrode busbar 140 opposite to the first bottom wall, and has multiple first acquisition plates adapted to multiple first welding points, which are welded to their corresponding first welding points. Similarly, the negative electrode acquisition plate 170 is disposed on the side of the negative electrode busbar 150 opposite to the second bottom wall 121, and has multiple second acquisition plates adapted to multiple second welding points, which are welded to their corresponding second welding points. Furthermore, both the positive electrode acquisition plate 160 and the negative electrode acquisition plate 170 have through holes in their middle sections for the fixing post 200 to pass through.

[0049] It should be noted that the number of the first collecting pieces is at least 15, and the 15 first collecting pieces correspond to the 15 groups of the tab pieces on the positive bus bar 140 one by one. The number of the second collecting pieces is at least 15, and the 15 second collecting pieces correspond to the 15 groups of the tab pieces on the negative bus bar 150 one by one. In the embodiment, the first collecting piece and the second collecting piece are preferably nickel pieces, and the voltage of the 15 groups of the cylindrical battery cells 130 is collected through the nickel pieces.

[0050] Further, in the embodiment of the present application, the positive collecting plate 160 is further provided with a positive temperature sensing piece, and the positive temperature sensing piece is bonded with the positive bus bar 140 to collect the temperature of the cylindrical battery cell 130. Similarly, the negative collecting plate 170 is provided with a negative temperature sensing piece, and the negative temperature sensing piece is bonded with the negative bus bar 150 to collect the temperature of the cylindrical battery cell 130. In the embodiment, the number and position of the positive temperature sensing piece and the negative temperature sensing piece can be set according to the requirement.

[0051] In addition, the positive collecting plate 160 is further provided with a positive low-voltage collecting interface 161 for connecting with an external device, and the negative collecting plate 170 is further provided with a negative low-voltage collecting interface 171 for connecting with an external device.

[0052] In the embodiment of the present application, the positive cell support 110 and the negative cell support 120 are both polygonal prism structures. The positive bus bar 140, the negative bus bar 150, the positive collecting plate 160 and the negative collecting plate 170 are all polygonal structures; the positive bus bar 140, the negative bus bar 150, the positive collecting plate 160 and the negative collecting plate 170 are arranged in alignment with the polygonal prism structure; the number of sides of the polygonal prism structure is the same as the number of sides of the polygonal structure.

[0053] In the following, a hexagon will be taken as an example for description. In the embodiment of the present application, the positive cell support 110 and the negative cell support 120 are both hexagonal prism structures, the positive bus bar 140, the negative bus bar 150, the positive collecting plate 160 and the negative collecting plate 170 are all hexagonal structures, and the positive bus bar 140, the negative bus bar 150, the positive collecting plate 160 and the negative collecting plate 170 are arranged in alignment with the hexagonal prism structure. The hexagonal prism structure includes a first side, a second side, a third side, a fourth side, a fifth side and a sixth side. That is, the module 100 assembly of the present application is formed into a hexagonal prism structure, and the space reserved by the first side, the second side, the third side, the fourth side, the fifth side and the sixth side of the hexagonal prism structure is convenient for wiring.

[0054] As an example, as shown in FIG. 6, the module 100 is a hexagonal prism structure, and the space reserved by the first side, the second side, the third side, the fourth side, the fifth side and the sixth side of the hexagonal prism structure is convenient for wiring. Figure 3 and Figure 4As shown, the positive connection lug 141 and the negative connection lug 151 are both located on the first side of the hexagonal prism structure, and the positive low-voltage collection interface 161 and the negative low-voltage collection interface 171 are both located on the second side of the hexagonal prism structure. In this way, the positive connection lug 141 and the negative connection lug 151 are arranged on one side, and the positive low-voltage collection interface 161 and the negative low-voltage collection interface 171 are arranged on the other side, so that the module 100 assembly can be conveniently connected in high voltage and collected in low voltage.

[0055] In the embodiments of the present application, as shown in Figure 4 The battery pack further includes a plurality of first high-voltage rows 700, two second high-voltage rows 800, and a connection wire 600. Each first high-voltage row 700 connects the positive connection lug 141 and the negative connection lug 151 of two adjacent modules 100. The two second high-voltage rows 800 respectively connect the positive connection lug 141 and the negative connection lug 151 of the two modules 100 located at both ends. The connection wire 600 connects all the positive low-voltage collection interfaces 161 and the negative low-voltage collection interfaces 171, and outputs through a connector for connection with external equipment.

[0056] The module 100 of the present application is assembled as follows:

[0057] A plurality of cylindrical cells 130 are sequentially placed in the positive cell support 110 and the negative cell support 120 according to the 6P15S series-parallel connection specification. After the positive cell support 110 and the negative cell support 120 are combined and assembled with the cylindrical cells 130, the bus bars on the positive bus bar 140 and the negative bus bar 150 are welded on the side surfaces of the positive cell support 110 and the negative cell support 120, respectively. The bus bars weld the negative or positive of the cylindrical cells 130. Then, the nickel sheets on the FPC positive collection plate 160 and the negative collection plate 170 are welded, and the temperature sensing sheets are bonded. Finally, the positive bus bar 140, the negative bus bar 150, the positive collection plate 160, and the negative collection plate 170 are hot-anchored to the positive cell support 110 and the negative cell support 120 using a hot anchor process, forming a single module 100.

[0058] As described above, the present application has a baffle 400 and an end plate 500 placed between and outside a plurality of modules 100, and a long threaded column passes through the center. The long threaded column is fastened by nuts at both ends, so that the plurality of modules 100 form a high-strength and high-rigidity assembly body.

[0059] The present application only needs to replace one module 100 when one module 100 fails, improving the maintenance and disassembly.

[0060] The application adopts array module 100 arrangement, when the demand voltage and electric quantity are different, the voltage and electric quantity can be changed by changing the series and parallel number of single module 100 and the number of overall module 100, which has high flexibility and matching compatibility.

[0061] The second aspect of the application provides a battery pack as described above.

[0062] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, which are used to illustrate the technical solutions of the present application, rather than limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features, within the technical scope disclosed by the present application. These modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application.

Claims

1. A battery pack, characterized by, The fixing column (200), the fixing part (300) and a plurality of module groups (100) are included; A plurality of the module groups (100) are arranged in a stack in a first direction (X); The fixing column (200) extends along the first direction (X), the fixing column (200) sequentially passes through a plurality of the module groups (100), and the fixing part (300) is connected with the end of the fixing column (200) to fix a plurality of the module groups (100).

2. The battery pack of claim 1, wherein, The fixing column (200) is a threaded column, the fixing part (300) is a nut, the number of the fixing column (200) is one, and the number of the fixing part (300) is two. The fixing column (200) sequentially passes through the middle part of a plurality of the module groups (100), and two fixing parts (300) are respectively threadedly connected with the two ends of the fixing column (200) to lock a plurality of the module groups (100).

3. The battery pack of claim 2, wherein, The module group (100) includes a positive electrode core support (110), a negative electrode core support (120) and a plurality of cylindrical electrode cores (130); The positive electrode core support (110) includes a first bottom wall and a first surrounding wall arranged along the edge of the first bottom wall, and the first bottom wall and the first surrounding wall form a first containing space; The negative electrode core support (120) includes a second bottom wall (121) and a second surrounding wall (122) arranged along the edge of the second bottom wall (121), and the second bottom wall (121) and the second surrounding wall (122) form a second containing space; The positive electrode core support (110) and the negative electrode core support (120) can be contacted to make the first containing space and the second containing space jointly contain a plurality of the cylindrical electrode cores (130); A plurality of the cylindrical electrode cores (130) are arranged in an array, the cylindrical electrode cores (130) extend along the first direction (X), and the first bottom wall and the second bottom wall (121) are respectively provided with a first mounting through hole and a second mounting through hole (1211) for mounting the cylindrical electrode cores (130); The middle part of the first bottom wall and the second bottom wall (121) is provided with a through hole for the fixing column (200) to pass through.

4. The battery pack of claim 3, wherein, The module group (100) further includes a positive electrode busbar (140), a positive electrode connecting lug (141), a negative electrode busbar (150) and a negative electrode connecting lug (151); The positive electrode busbar (140) is arranged on one side of the first bottom wall, the positive electrode busbar (140) is provided with a plurality of first welding points adapted to a plurality of the cylindrical electrode cores (130), the first welding points are welded with the corresponding cylindrical electrode cores (130) through the first mounting through hole, and the positive electrode connecting lug (141) is connected with the positive electrode busbar (140). The negative bus bar (150) is arranged on one side of the second bottom wall (121), and a plurality of second welding points adapted to the plurality of cylindrical battery cells (130) are arranged on the negative bus bar (150), and the second welding points are welded with the corresponding cylindrical battery cells (130) through the second mounting through holes (1211); and the negative connection lug (151) is connected with the negative bus bar (150). The positive bus bar (140) and the negative bus bar (150) are both formed with an avoiding space for the fixing column (200) to pass through.

5. The battery pack of claim 4, wherein, The module (100) further comprises a positive collection plate (160) and a negative collection plate (170). The positive collection plate (160) is arranged on the side of the positive bus bar (140) away from the first bottom wall, a plurality of first collection pieces adapted to the plurality of first welding points are arranged on the positive collection plate (160), and the first collection pieces are welded with the corresponding first welding points; a positive low-voltage collection interface (161) is further arranged on the positive collection plate (160); and / or a positive temperature sensing piece is arranged on the positive collection plate (160) and is attached to the positive bus bar (140). The negative collection plate (170) is arranged on the side of the negative bus bar (150) away from the second bottom wall (121), a plurality of second collection pieces adapted to the plurality of second welding points are arranged on the negative collection plate (170), and the second collection pieces are welded with the corresponding second welding points; a negative low-voltage collection interface (171) is further arranged on the negative collection plate (170); and / or a negative temperature sensing piece is arranged on the negative collection plate (170) and is attached to the negative bus bar (150). Through holes are formed in the middle of the positive collection plate (160) and the negative collection plate (170) for the fixing column (200) to pass through.

6. The battery pack of claim 5, wherein, The positive battery cell support (110) and the negative battery cell support (120) are both polygonal prism structures. The positive bus bar (140), the negative bus bar (150), the positive collection plate (160), and the negative collection plate (170) are all polygonal structures, and are arranged in alignment with the polygonal prism structures. The number of sides of the polygonal prism structures and the number of sides of the polygonal structures are both N.

7. The battery pack of claim 6, wherein, The positive low-voltage collection interface (161) and the negative low-voltage collection interface (171) are both located on any one side of the other side of the combined polygonal prism structure.

8. The battery pack of any one of claims 1-7, wherein, The battery pack further comprises a plurality of separators (400). The partition plate (400) is arranged between any two adjacent modules (100), and a through hole is arranged in the middle of the partition plate (400) for the fixing column (200) to pass through.

9. The battery pack of claim 8, wherein, The battery pack further comprises an end plate (500). Among the plurality of modules (100), the outer sides of two modules (100) at both ends are sequentially provided with the partition plate (400) and the end plate (500), and the end plate (500) is provided with a through hole for the fixing column (200) to pass through.

10. An electric device, characterized by A battery pack comprising any one of the claims 1-9.

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