Battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack. The battery pack has a first direction and a second direction which are intersected, and the battery pack comprises a shell, a pressing strip and at least two battery packs, wherein the pressing strip and the at least two battery packs are arranged in the shell; the at least two battery packs are arranged along the first direction, and each battery pack comprises a plurality of battery cells arranged along the second direction; each battery cell comprises a cover plate, the top surface of the cover plate of each battery cell is provided with two windows, the two windows are respectively arranged on two opposite sides of the cover plate in the first direction, and the windows form metal surfaces exposed outside of the cover plate; the pressing strips extend in the second direction, and the windows on the two adjacent sides of every two adjacent battery packs are connected with one pressing strip at the same time. The battery pack provided by the utility model solves the problems of low grouping efficiency and low structural strength of the existing battery pack.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery pack. Background Technology

[0002] The contemporary automotive industry is undergoing a revolutionary change, with traditional gasoline-powered vehicles gradually being replaced by new energy vehicles. Among these, pure electric vehicles are emerging as a type of new energy vehicle. Many traditional gasoline vehicle platforms are directly replacing the engine structure with a power battery pack structure, changing the vehicle's power source from fuel to batteries. With the emergence of new energy vehicles on the market, and as people's demands for the driving range of electric vehicles have increased, the same battery parameters mean a longer driving range, requiring more batteries to be placed in the battery pack of electric vehicles.

[0003] However, traditional battery packs have low assembly efficiency and low structural strength. Utility Model Content

[0004] The purpose of this application is to provide a battery pack that solves the problems of low assembly efficiency and low structural strength of existing battery packs.

[0005] According to this application, a battery pack is provided, the battery pack having intersecting first and second directions, the battery pack including a housing, a pressure strip disposed inside the housing, and at least two battery packs; the at least two battery packs are arranged along the first direction, each battery pack including a plurality of cells arranged along the second direction; the length direction of each cell is parallel to the first direction; each cell includes a cover plate, the top surface of the cover plate of each cell having two openings, the two openings being respectively disposed on opposite sides of the cover plate in the first direction, the openings forming the exposed metal surface of the cover plate; the pressure strip extends along the second direction, and the openings on adjacent sides of two adjacent battery packs are simultaneously connected to one pressure strip.

[0006] In any of the above technical solutions, the battery pack further satisfies: b ≥ 4 mm; where b is the minimum size of the window in the first direction.

[0007] In any of the above technical solutions, the battery cell further includes an exposed insulating film, a portion of which is disposed at the edge of the window; the battery pack satisfies: 0.95≥f / c≥0.5; where f is the minimum dimension of the window in the second direction, and c is the dimension of the battery cell in the second direction.

[0008] In any of the above technical solutions, the battery cell further includes two sides facing each other in the first direction; the battery pack satisfies: d≤2mm; where d is the minimum distance from the edge of the window near one side of the battery cell to that side of the battery cell.

[0009] In any of the above technical solutions, the battery cell further includes an insulating sheet and two terminals with opposite polarities; the two terminals are integrally connected to the cover plate, and the insulating sheet is provided with clearance holes at the corresponding positions of the terminals; the two terminals are spaced apart in the first direction, and the two openings are respectively located on opposite sides of the two terminals in the first direction; the battery pack satisfies: l < 10 mm; where l is the minimum distance from the edge of the insulating sheet near one side of the battery cell to that side of the battery cell; the battery pack satisfies: e / a ≤ 9%; where e is the minimum distance from the edge of the terminal to the side of the battery cell corresponding to that terminal, and a is the size of the battery cell in the first direction.

[0010] In any of the above technical solutions, the battery pack further satisfies: h / a≤0.13; where h is the dimension of the pressure strip in the first direction; and / or, the thickness of the pressure strip is ≥3mm.

[0011] In any of the above technical solutions, the housing further includes a bottom plate and at least two crossbeams disposed on the bottom plate; the at least two crossbeams are arranged along the second direction, each crossbeam extends along the first direction, and the battery pack is disposed between two adjacent crossbeams;

[0012] The battery pack satisfies: i / c = 1~8%; where i is the gap between two adjacent cells in the second direction, and c is the size of the cell in the second direction; and / or, the battery pack satisfies: g ≤ 5mm; where g is the gap between the cell at its end and the crossbeam.

[0013] In any of the above technical solutions, the battery pack further includes a first heat insulation plate, a second heat insulation plate, and an end plate; two adjacent battery packs together form a battery module, the first heat insulation plate is bonded between two battery packs in the same battery module, and the second heat insulation plate is bonded between two adjacent battery modules; the end plates are bonded to both sides of the battery module that are opposite to each other in the second direction.

[0014] In any of the above technical solutions, the battery pack further includes a busbar connected to the battery cell, and the same pressure bar is disposed between two adjacent sets of busbars of two adjacent battery packs.

[0015] In any of the above technical solutions, the battery pack further includes a cold plate disposed inside the housing; the bottom surface of the battery pack is bonded to the cold plate; and the windows on adjacent sides of two adjacent battery packs are simultaneously bonded to a pressure strip.

[0016] The battery pack of this application includes a housing, a retaining strip disposed inside the housing, and at least two battery packs. The at least two battery packs are arranged along a first direction, and each battery pack includes multiple cells arranged along a second direction. Each cell includes a cover plate, and the top surface of each cell's cover plate has two openings, which are respectively disposed on opposite sides of the cover plate in the first direction, forming exposed metal surfaces of the cover plate. The retaining strip extends along the second direction, and the openings on adjacent sides of two adjacent battery packs are simultaneously connected to one retaining strip.

[0017] Based on the above technical features, the beneficial effects of this application are as follows:

[0018] The pressure strip of this application extends along a second direction and securely connects the tops of two adjacent battery packs. Furthermore, the pressure strip connects to the metal surface (window) of the cover plate, a connection method that is more stable and robust than direct connection to the cover plate or the external insulating film of the battery cell.

[0019] As described above, this application connects two adjacent battery packs by using a pressure strip, which not only increases the battery pack assembly efficiency and improves the structural strength of the battery pack, but also allows the pressure strip to resist the expansion force of the battery cells during use.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of the battery pack according to an embodiment of this application is shown;

[0023] Figure 2 Show Figure 1 Enlarged schematic diagram of part A;

[0024] Figure 3 A schematic diagram illustrating the assembly of the pressure strip according to an embodiment of this application is shown;

[0025] Figure 4 A schematic diagram of the structure of a battery cell according to an embodiment of this application is shown;

[0026] Figure 5 A schematic diagram of the structure of a battery cell according to an embodiment of this application is shown;

[0027] Figure 6 Show Figure 5 Enlarged schematic diagram of part B;

[0028] Figure 7 Show Figure 5 Enlarged schematic diagram of part B;

[0029] Figure 8 A schematic diagram of the housing structure of an embodiment of this application is shown;

[0030] Figure 9 An assembly diagram of a battery pack according to an embodiment of this application is shown;

[0031] Figure 10 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown;

[0032] Figure 11 An assembly diagram of multiple battery modules according to embodiments of this application is shown;

[0033] Figure 12 A schematic diagram illustrating the assembly of the filler according to an embodiment of this application;

[0034] Figure 13 This diagram illustrates the assembly of the battery pack after it is installed in the housing, according to an embodiment of this application.

[0035] Figure 14 This is a schematic diagram showing the assembly of the battery pack before it is installed in the housing, according to an embodiment of this application.

[0036] Icons: 1000-Battery module; 100-Battery pack; 110-Cell; 111-Cover plate; 112-Window; 120-Insulating film; 130-Terminal post; 140-Insulating sheet; 200-Pressure strip; Y-First direction; X-Second direction; 300-Housing; 310-Horizontal beam; 320-First horizontal beam; 330-Vertical beam; 400-Busbar; 500-Cold plate; 600-First heat insulation plate; 700-Second heat insulation plate; 800-End plate; 900-Filling component. Detailed Implementation

[0037] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0038] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0039] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0040] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0041] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0042] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0043] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0044] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0045] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0046] The purpose of this application is to provide a battery pack that solves the problems of low assembly efficiency and low structural strength of existing battery packs. See below for reference. Figures 1 to 14 This application describes a battery pack according to some embodiments. The battery pack of this application has a first direction Y and a second direction X that are perpendicular to each other. It should be noted that the above perpendicularity can be 90° ± 5°.

[0047] like Figures 1 to 4 As shown, the battery pack of this application includes a housing 300, a retaining strip 200 disposed inside the housing 300, and at least two battery packs 100. The at least two battery packs 100 are arranged along a first direction Y, and each battery pack 100 includes a plurality of battery cells 110 arranged along a second direction X. Figure 4 and Figure 5As shown, the battery cell 110 includes a cover plate 111. The top surface of the cover plate 111 of each battery cell 110 is provided with two openings 112. The two openings 112 are respectively provided on opposite sides of the cover plate 111 in the first direction Y. The openings 112 form the exposed metal surface of the cover plate 111. The pressure strip 200 extends along the second direction X. The openings 112 on the adjacent sides of two adjacent battery packs 100 are simultaneously connected to a pressure strip 200.

[0048] In other words, the cover plate 111 of the cell 110 of this application has aluminum-exposed windows 112 on both sides of its shoulder. The pressure strip 200 extends along the second direction X and fixes the tops of two adjacent battery packs 100 together through the aluminum-exposed windows 112 on both sides. In addition, the pressure strip 200 is directly bonded to the metal surface (windows 112) of the cover plate 111. This bonding method is more stable and stronger than the direct bonding of the pressure strip 200 to the cover plate 111 or the external insulating film 120 of the cell 110. As described above, this application connects two adjacent battery packs 100 together by the pressure strip 200, which not only increases the assembly efficiency of the battery pack 100 and improves the structural strength of the battery pack, but also allows the pressure strip 200 to resist the expansion force of the cell 110 during use.

[0049] In the embodiments of this application, preferably, such as Figure 5 and Figure 6 As shown, the battery pack satisfies: b ≥ 4 mm; where b is the minimum dimension of the opening 112 in the first direction Y. As an example, the opening 112 of this application can be rectangular, with a width ≥ 4 mm, to ensure the bonding area between the opening 112 and the pressure strip 200, thereby ensuring the stability and firmness of the bonding method.

[0050] In the embodiments of this application, further, as shown... Figure 5 and Figure 6 As shown, the battery cell 110 also includes an exposed insulating film 120, part of which wraps around the outer side of the battery cell 110, and part of which extends to wrap around the edge of the window 112. The battery pack of this application satisfies: 0.95 ≥ f / c ≥ 0.5; where f is the minimum dimension of the window 112 in the second direction X, and c is the dimension X of the battery cell 110 in the second direction X. This configuration, f / c ≥ 0.5, ensures the bonding area between the window 112 and the pressure strip 200, thereby ensuring the stability and firmness of the bonding method. 0.95 ≥ f / c ensures that insulating films 120 are left on opposite sides of the window 112 in the second direction X, preventing short circuits between adjacent battery cells 110 due to foreign objects or moisture.

[0051] In the embodiments of this application, further, as shown... Figure 5 and Figure 6As shown, the battery cell 110 includes two opposing sides in the first direction Y. The battery pack satisfies: d ≤ 2mm; where d is the minimum distance from the edge of the window 112 near the side of the battery cell 110 to that side of the battery cell 110. That is, the distance d from the window 112 to the side of the battery cell 110 is ≤ 2mm. This setting ensures the bonding area between the window 112 and the pressure strip 200, thereby ensuring the stability and firmness of the bonding method.

[0052] And such as Figure 5 and Figure 7 As shown, the battery cell 110 of this application also includes an insulating sheet 140 and two terminals 130 with opposite polarities. The insulating sheet 140 covers a cover plate 111, and the two terminals 130 pass through the insulating sheet 140 and are integrally connected to the cover plate 111, with the two terminals 130 exposed on the insulating sheet 140. The two terminals 130 are spaced apart in the first direction Y, and two openings 112 are located on opposite sides of the two terminals 130 in the first direction Y. The battery pack satisfies: l < 10 mm; where l is the minimum distance from the edge of the insulating sheet 140 near one side of the battery cell 110 to that side of the battery cell 110. Additionally, the battery pack satisfies: e / a ≤ 9%; where e is the minimum distance from the edge of the terminal 130 to the side of the battery cell 110 corresponding to that terminal 130, and a is the dimension of the battery cell 110 in the first direction Y (a can be 100 mm to 300 mm). As described above, the battery pack of this application satisfies l < 10 mm and e / a ≤ 9% to ensure that even if the terminal post 130 and the insulating sheet 140 are close to the edge of the cell 110, the shoulder opening 112 of the cell 110 can still be realized, thereby improving the structural strength of the battery pack.

[0053] Another point worth mentioning is, such as Figure 1 and Figure 2 As shown, the battery pack of this application also includes a busbar 400 connected to the battery cell 110, and the same pressure strip 200 is disposed between two adjacent busbars 400 of two adjacent battery packs 100. And as... Figure 1 and Figure 2 As shown, the battery pack of this application satisfies: h / a ≤ 0.13; where h is the dimension of the pressure strip 200 in the first direction Y. With this configuration, the width of the pressure strip 200 should ensure that both sides of the pressure strip 200 are simultaneously bonded to the openings 112 of at least two adjacent battery packs 100. If h / a > 0.13, the excessive width of the pressure strip 200 will affect the installation of the pressure strip 200 or the busbar 400. Furthermore, the thickness of the pressure strip 200 should be ≥ 3mm to ensure the structural strength of the pressure strip 200 and the entire battery pack 100, effectively resisting the expansion force of the battery cell 110 during use. Additionally, the height of the pressure strip 200 should be higher than the busbars 400 on both sides, serving as an isolation layer to prevent short circuits caused by moisture or foreign objects in the busbars 400 on both sides.

[0054] In the embodiments of this application, such as Figure 10 and Figure 11 As shown, the battery pack of this application also includes a first heat insulation plate 600, a second heat insulation plate 700, and an end plate 800. Two adjacent battery packs 100 together form a battery module 1000. The first heat insulation plate 600 is bonded between two battery packs 100 within the same battery module 1000, and the second heat insulation plate 700 is bonded between two adjacent battery modules 1000. End plates 800 are bonded to both opposite sides of the battery module 1000 in the second direction X.

[0055] The first heat insulation plate 600 of this application is bonded to the battery cells 110 on both sides of the battery pack 100 by applying structural adhesive on both sides. When two battery packs 100 are combined into a battery module 1000, pressure is first applied to the sides, and after the battery cells 110 are bonded to the first heat insulation plate 600, they are then bonded to the end plate 800. A second heat insulation plate 700 is then bonded between the two battery modules 1000. After all battery modules 1000 are inserted into the housing 300, the sides of the battery modules 1000 are pressed together to ensure adhesion of the adhesive layer on the sides of the second heat insulation plate 700.

[0056] The integrated heat insulation plate of this application is glued to the two sides of the battery cell 110, which not only improves the structural strength of the battery pack, but also prevents heat transfer between the sides of the battery cell 110 after thermal runaway, thus avoiding the entire pack from catching fire.

[0057] In addition, such as Figure 12 As shown, a filler 900 is provided between two cells 110 in the same battery pack 100. The filler 900 can act as a buffer to ensure the gap between the cells 110 and ensure the normal use of the cells 110. The filler 900 can be compressed and deformed and can spring back to ensure the battery pack is assembled, ensure that the battery module 1000 can be placed in the box under overpressure, and ensure that the dimensions of the battery module 1000 are restored after being placed in the box and contact the crossbeam (first crossbeam 320).

[0058] In this embodiment, as Figure 10 As shown, the battery module 1000 has two cells 110 in the width direction and ≤20 cells 110 in the length direction. That is, the number of cells 110 in a single battery module 1000 is ≤40. Before the battery module 1000 is installed in the casing, the length direction of the battery module 1000 can be compressed and deformed. The deformation size / module length should be <0.02.

[0059] In the embodiments of this application, such as Figure 8 and Figure 9As shown, the housing 300 (lower housing 300) of this application includes a base plate, two vertical side beams 330 extending along a second direction X, and at least two cross beams. The two vertical side beams 330 are arranged around the edge of the base plate. The at least two cross beams are arranged along the second direction X, each cross beam extending along a first direction Y, and both ends of each cross beam are connected to the vertical side beams 330. The battery pack 100 is disposed between two adjacent cross beams.

[0060] It should be noted that the beams mentioned above can include two types.

[0061] In the embodiments of this application, such as Figure 8 and Figure 9 As shown, the first scenario is illustrated. In this scenario, the aforementioned beam only includes... Figure 8 The first crossbeam 320 is in the middle, and the battery pack 100 is arranged between two adjacent first crossbeams 320.

[0062] Building upon the first scenario, to further enhance the overall strength of the battery pack and facilitate the arrangement of other components, such as... Figure 8 and Figure 9 As shown, the edge of the base plate is also provided with two transverse beams 310 extending along the first direction Y.

[0063] In the second case (not shown in the accompanying drawings of this application), the aforementioned beam includes... Figure 8 The first crossbeam 320 and the side beam 310 are located in the middle; the battery pack 100 located at both ends of the battery pack is disposed between the adjacent first crossbeam 320 and side beam 310.

[0064] In other words, the battery pack 100 is positioned between two crossbeams, which can resist the expansion force of the battery cell 110 during use. Compared with the prior art, this application changes the expansion force bearing structure from the module end plate 800 to the lower housing 300 of the battery pack, significantly reducing costs.

[0065] In addition, the upper module of this application has a reinforcing beam at the end to ensure the structural strength of the overall module, while the lower module does not have a reinforcing beam, and there are no other metal parts above the pressure strip 200 except for the battery pack upper shell 300.

[0066] In the embodiments of this application, such as Figure 14 As shown, when the battery module 1000 is inserted into the housing 300, it is in an overvoltage state, and there is a gap Z between the end plate 800 of the battery module 1000 and the crossbeam (first crossbeam 320) of the lower housing 300. Figure 13 As shown, after being placed in the box, the filling material of the battery module 1000 rebounds and comes into contact with the crossbeam (first crossbeam 320) of the lower housing 300.

[0067] In the embodiments of this application, the battery pack satisfies: i / c = 1~8%; where i is the gap between two adjacent cells 110 in the second direction X, and c is the size of cell 110 in the second direction X. The battery pack also satisfies: g ≤ 5mm; where g is the gap between the outermost cell of the battery pack 100 and the crossbeam (first crossbeam 320). With this configuration, the end plate 800 of this application is made of non-metallic material, has a thinner thickness, lower weight, lower cost, and higher assembly efficiency. Furthermore, it can effectively improve the volume utilization rate of the battery module 1000 in the second direction X.

[0068] Furthermore, it is worth mentioning that in the embodiments of this application, such as Figure 8 As shown, the battery pack also includes a cold plate 500 disposed inside the housing 300, and the bottom surface of the battery pack 100 is bonded to the cold plate 500. That is, an adhesive layer exists between the cold plate 500 and the battery pack 100, the adhesive layer serving to fix the battery pack 100 and conduct heat with the battery pack 100. In this embodiment, the area of ​​the adhesive layer is ≥ 40% of the total area of ​​the battery pack 100, and the thermal conductivity of the adhesive layer is 0.1–1.5 W.

[0069] In summary, in the highly integrated CTP battery pack of this application, aluminum-exposed windows 112 are present on the shoulders of the cover plate 111 on both sides of the cell 110. The pressure strip 200 extends along the second direction X and fixes the tops of two adjacent battery packs 100 together through the aluminum-exposed windows 112 on both sides. In addition, the pressure strip 200 is directly bonded to the metal surface (window 112) of the cover plate 111. This bonding method is more stable and stronger than the direct bonding of the pressure strip 200 to the cover plate 111 or the external insulating film 120 of the cell 110. Furthermore, the bottom of the battery pack 100 is bonded to the cold plate 500. As mentioned above, this application connects the tops and bottoms of two adjacent battery packs 100 respectively through the pressure strip 200 and the cold plate 500, which not only increases the assembly efficiency of the battery pack 100 and improves the structural strength of the battery pack, but also allows the pressure strip 200 to resist the expansion force of the cell 110 during use.

[0070] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this 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 still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.

Claims

1. A battery pack, characterized in that, The battery pack has intersecting first direction (Y) and second direction (X), and the battery pack includes a housing (300), a pressure strip (200) disposed inside the housing (300), and at least two battery packs (100); At least two of the battery packs (100) are arranged along the first direction (Y), and each battery pack (100) includes a plurality of cells (110) arranged along the second direction (X); the length direction of each cell (110) is parallel to the first direction (Y); The battery cell (110) includes a cover plate (111), and the top surface of the cover plate (111) of each battery cell (110) is provided with two openings (112). The two openings (112) are respectively provided on the two opposite sides of the cover plate (111) in the first direction (Y), and the openings (112) are formed as the exposed metal surface of the cover plate (111). The pressure strip (200) extends along the second direction (X), and the windows (112) on the adjacent sides of two adjacent battery packs (100) are simultaneously connected to one of the pressure strips (200).

2. The battery pack according to claim 1, characterized in that, The battery pack satisfies: b ≥ 4 mm; where b is the minimum size of the opening (112) in the first direction (Y).

3. The battery pack according to claim 1, characterized in that, The battery cell (110) also includes an exposed insulating film (120), a portion of which is disposed at the edge of the window (112); The battery pack satisfies: 0.95≥f / c≥0.5; where f is the minimum dimension of the window (112) in the second direction (X), and c is the dimension X of the cell (110) in the second direction (X).

4. The battery pack according to claim 3, characterized in that, The battery cell (110) includes two sides facing each other in the first direction (Y); The battery pack satisfies: d≤2mm; where d is the minimum distance from the edge of the window (112) near the side of the cell (110) to that side of the cell (110).

5. The battery pack according to claim 4, characterized in that, The battery cell (110) also includes an insulating sheet (140) and two terminals (130) with opposite polarities; the two terminals (130) are integrally connected to the cover plate (111), and the insulating sheet (140) is provided with clearance holes at corresponding positions of the terminals (130); The two pole posts (130) are spaced apart in the first direction (Y), and the two openings (112) are respectively located on opposite sides of the two pole posts (130) in the first direction (Y); The battery pack satisfies: l < 10 mm; where l is the minimum distance from the edge of the insulating sheet (140) near the side of the cell (110) to that side of the cell (110); The battery pack satisfies: e / a≤9%; where e is the minimum distance from the edge of the terminal post (130) to the side of the cell (110) corresponding to the terminal post (130), and a is the size of the cell (110) in the first direction (Y).

6. The battery pack according to claim 5, characterized in that, The battery pack satisfies: h / a ≤ 0.13; where h is the dimension of the pressure strip (200) in the first direction (Y); And / or, the thickness of the pressure strip (200) is ≥3mm.

7. The battery pack according to claim 1, characterized in that, The housing (300) includes a base plate and at least two crossbeams disposed on the base plate; At least two of the crossbeams are arranged along the second direction (X), each of the crossbeams extends along the first direction (Y), and the battery pack (100) is disposed between two adjacent crossbeams; The battery pack satisfies: i / c = 1 to 8%; where i is the gap between two adjacent cells (110) in the second direction (X), and c is the size of the cell (110) in the second direction (X); And / or, the battery pack satisfies: g≤5mm; where g is the gap between the battery cell (110) located at its own end and the crossbeam.

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a first heat insulation plate (600), a second heat insulation plate (700), and an end plate (800); Two adjacent battery packs (100) together form a battery module (1000), and the first heat insulation plate (600) is bonded between the two battery packs (100) in the same battery module (1000), and the second heat insulation plate (700) is bonded between the two adjacent battery modules (1000). The end plates (800) are bonded to both sides of the battery module (1000) that are opposite to each other in the second direction (X).

9. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a busbar (400) connected to the cell (110), and the same pressure bar (200) is disposed between two adjacent sets of busbars (400) of two adjacent battery packs (100).

10. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a cold plate (500) disposed inside the housing (300); The bottom surface of the battery pack (100) is bonded to the cold plate (500); The windows (112) on the adjacent sides of two adjacent battery packs (100) are simultaneously bonded to one of the pressure strips (200).

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