Long battery cell structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a long battery cell structure and a battery, the long battery cell structure has a length direction, the long battery cell structure comprises a pole group assembly, and the pole group assembly comprises a plurality of pole group bodies which are sequentially arranged along the length direction; the long battery cell structure further comprises at least two straightening parts and a plurality of connecting beams, the straightening parts extend in the length direction and are arranged on the two sides of the pole group assembly in the width direction, the connecting beams are connected with the straightening parts located on the two sides of the pole group assembly in the width direction, and the width direction intersects with the length direction; a connecting beam is arranged between every two adjacent pole group bodies, each connecting beam is provided with a connecting hole penetrating through the corresponding connecting beam in the length direction, and every two adjacent pole group bodies are electrically connected through the corresponding connecting hole. According to the long battery cell structure and the battery provided by the invention, the bending strength of the long battery cell structure in the length direction is improved, the bending probability of the pole assembly is reduced, and the problem of poor battery assembly caused by overlong pole assembly is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a long battery cell structure and a battery. Background Art

[0002] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage. To meet the requirements of high voltage, long driving range, and lower costs, battery companies are increasing the length of single cells to improve their energy density.

[0003] However, increasing the length of the single cell results in a longer length dimension of the long battery cell structure (for example, the length of the single cell is greater than or equal to 400 mm). Correspondingly, the length dimension of its electrode group is also longer (for example, the battery cells described in the long battery cell electrode group and long battery, battery module and power battery in the Chinese patent document CN211480207U). This makes it very easy for the electrode group to bend and deform during the assembly process of the single cell battery, resulting in poor assembly of the single cell battery, and defects such as wrinkling, deformation, layer crosstalk, and breakage caused by the excessive length of the electrode piece. Utility Model Content

[0004] The purpose of this application is to provide a long battery cell structure and battery, so as to solve to a certain extent the existing technical problems that in order to meet the requirements of high voltage and long driving range of automobiles with lower costs, battery companies increase the length of single cells to increase the energy density of single cells. The length of the long battery cell structure is large. During the assembly of single cells, the electrode group is very likely to bend and deform, resulting in poor assembly of the single cells, and the excessive length of the electrode causes wrinkles, deformation, layer crosstalk, breakage and other technical problems.

[0005] According to a first aspect of the present application, there is provided a long battery cell structure, the long battery cell structure having a length direction, the long battery cell structure comprising a pole group assembly, the pole group assembly comprising a plurality of pole group bodies sequentially arranged along the length direction;

[0006] The long cell structure further includes at least two straightening portions and a plurality of connecting beams, wherein the straightening portions extend along the length direction and are arranged on both sides of the electrode group assembly in the width direction, and the connecting beams connect the straightening portions located on both sides of the electrode group assembly in the width direction, and the width direction intersects the length direction;

[0007] The connecting beam is provided between two adjacent pole group bodies. The connecting beam is provided with a connecting hole penetrating the connecting beam along the length direction. The two adjacent pole group bodies are electrically connected via the connecting hole.

[0008] Preferably, the connecting beam includes a connecting body and a connecting cover plate that can be buckled with each other along the thickness direction, the connecting body and the connecting cover plate are arranged to form the connecting hole, and the thickness direction intersects with a plane determined by the length direction and the width direction.

[0009] Preferably, the connecting body is provided with first clamping parts at both ends in the width direction, and second clamping parts are provided at corresponding positions of the straightening part, and the connecting beam and the straightening part are clamped via the first clamping parts and the second clamping parts.

[0010] Preferably, the connection hole is provided on the connection cover plate.

[0011] Preferably, it further comprises a snap-in end plate, which is arranged at both ends of the pole group assembly in the length direction, and the straightening portions located on both sides of the pole group assembly in the width direction are snap-connected with the snap-in end plate.

[0012] Preferably, it also includes a cover plate, which is arranged on the side of the snap-in end plate facing away from the pole group assembly. The snap-in end plate is provided with a wire threading hole passing through the snap-in end plate along the length direction, and the pole group assembly is electrically connected to the cover plate via the wire threading hole.

[0013] Preferably, it further comprises a shell and an explosion-proof valve, wherein the pole group assembly, the straightening portion and the connecting beam are arranged in the shell;

[0014] The shell is provided with an explosion-proof opening, and the explosion-proof valve cover is arranged on the explosion-proof opening.

[0015] Preferably, the shell further comprises a protective patch, the protective patch is attached to the explosion-proof opening from the inner side of the shell, and the protective patch is provided with a breathable portion passing through the protective patch.

[0016] Preferably, the explosion-proof opening is provided on a side surface of the housing in the width direction;

[0017] There are multiple explosion-proof openings, and each explosion-proof opening is provided at a position of the shell corresponding to the middle of each pole group body in the longitudinal direction.

[0018] According to the second aspect of the present application, a battery is provided, comprising the long cell structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the long cell structure, which will not be described in detail here.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The long battery cell structure provided in the present application is achieved by arranging the electrode group assembly into a structure of electrode group bodies connected in sequence along the length direction, arranging a connecting beam between two adjacent electrode group bodies, and arranging at least two straightening portions extending along the length direction on both sides of the electrode group assembly in the width direction, and making the connecting beam respectively connect the straightening portions located on both sides of the electrode group assembly in the width direction. In this way, on the one hand, by arranging the electrode group assembly into a segmented structure of multiple electrode group bodies, and making two adjacent electrode group bodies electrically connected through the connecting holes of the connecting beam, the electrode group assembly maintains the power storage capacity of the long battery cell while effectively shortening the length of the electrode group body and reducing the probability of bending of the electrode column assembly; on the other hand, the straightening portions extending along the length direction are arranged on both sides of the width direction of the electrode group assembly and connected by the connecting beam, so as to further improve the bending strength of the long battery cell structure in the length direction, thereby effectively avoiding the problem of poor battery assembly caused by excessive length of the electrode group assembly.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram of the exploded structure of a long battery cell structure provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a long battery cell provided in an embodiment of the present application;

[0025] Figure 3 for Figure 2 The provided schematic diagram of the partially enlarged structure of the long battery cell structure at point B;

[0026] Figure 4 for Figure 2 The provided schematic diagram of the partially enlarged structure of the long battery cell structure at position C;

[0027] Figure 5 A schematic cross-sectional view of a long battery cell structure provided in an embodiment of the present application;

[0028] Figure 6 A schematic side view of the long battery cell structure provided in an embodiment of the present application;

[0029] Figure 7 for Figure 6 A schematic diagram of the enlarged structure of the local structure obtained by cutting the long battery cell structure along the AA direction is provided;

[0030] Figure 8 This is a schematic diagram of the front view of the protective patch provided in an embodiment of the present application;

[0031] Figure 9 Schematic diagram of the exploded structure of the connecting beam provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1-straightening portion; 11-second clamping portion; 12-claw; 2-clamping end plate; 21-threading hole; 22-claw; 3-connecting beam; 31-connecting body; 32-connecting cover; 33-first clamping portion; 34-connecting hole; 4-cover; 41-pole; 5-housing; 61-explosion-proof vent; 62-protective sticker; 621-ventilation portion; 71-pole ear;

[0034] L-length direction; W-width direction; T-thickness direction. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0037] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] 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 in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Refer to the following Figures 1 to 9 The long cell structure and battery according to some embodiments of the present application are described.

[0041] See also Figures 1 to 9 As shown, an embodiment of the first aspect of the present application provides a long battery cell structure, wherein the long battery cell structure has a length direction L. The long battery cell structure includes a pole group assembly, and the pole group assembly includes a plurality of pole group bodies arranged in sequence along the length direction L. The long battery cell structure also includes at least two straightening portions 1 and a plurality of connecting beams 3, the straightening portion 1 extending along the length direction L, the straightening portion 1 being arranged on both sides of the pole group assembly in the width direction W, the connecting beam 3 connecting the straightening portions 1 located on both sides of the pole group assembly in the width direction W, and the width direction W intersecting with the length direction L. A connecting beam 3 is provided between two adjacent pole group bodies, and the connecting beam 3 is provided with a connecting hole 34 passing through the connecting beam 3 along the length direction L, and the two adjacent pole group bodies are electrically connected via the connecting hole 34.

[0042] According to the long battery cell structure provided by the above technical features, the electrode group assembly is arranged into a structure of electrode group bodies connected in sequence along the length direction L, and the connecting beam 3 is arranged between two adjacent electrode group bodies, and at least two straightening parts 1 extending along the length direction L are arranged on both sides of the electrode group assembly in the width direction W, and the connecting beam 3 is respectively connected to the straightening parts 1 located on both sides of the electrode group assembly in the width direction W. In this way, on the one hand, by arranging the electrode group assembly into a segmented structure of multiple electrode group bodies, and electrically connecting two adjacent electrode group bodies through the connecting hole 34 of the connecting beam 3, the electrode group assembly maintains the power storage capacity of the long battery cell while effectively shortening the length of the electrode group body and reducing the probability of bending of the pole column 41 assembly; on the other hand, the straightening parts 1 extending along the length direction L are arranged on both sides of the width direction W of the electrode group assembly and connected by the connecting beam 3, so as to further improve the bending strength of the long battery cell structure in the length direction L, thereby effectively avoiding the problem of poor battery assembly caused by excessive length of the electrode group assembly.

[0043] like Figures 1 to 9As shown, the L shown in the figure can be an example of the above-mentioned length direction L, and the W shown in the figure can be an example of the above-mentioned width direction W. The length direction L and the width direction W intersect each other. Preferably, the length direction L and the width direction W are perpendicular to each other, so as to adapt to the square shell battery cell. For the convenience of description, the direction perpendicular to the plane determined by the length direction L and the width direction W is defined as the thickness direction T. The T shown in the figure can be an example of the above-mentioned thickness direction T. Preferably, the thickness direction T can be perpendicular to the plane determined by the length direction L and the width direction W.

[0044] Preferably, if Figure 1 and Figure 2 As shown in the figure, an example in which the pole group assembly is divided into two sections, that is, an example in which the pole group assembly includes two pole group bodies, and correspondingly, the number of the connecting beam 3 can be one. However, this is not limited to this, and the number of the pole group bodies can be adaptively adjusted according to the size of the pole column 41 assembly in the length direction L.

[0045] Preferably, if Figure 1 and Figure 2 As shown in the figure, there are two straightening portions 1, each provided on either side of the electrode assembly in the width direction W. The straightening portions 1 can be attached to the side of the electrode assembly to facilitate alignment. However, this is not limiting, and the number of straightening portions 1 can be adaptively adjusted based on the dimensions of the scintillating electrode assembly in the thickness direction T.

[0046] Preferably, if Figures 1 to 4 As shown, the straightening portion 1 may include straightening patches and connecting ribs both extending along the length direction L. The straightening patches and the connecting ribs are alternately arranged, and in the thickness direction T, the size of the straightening patches is larger than the size of the connecting ribs. In this way, the weight of the straightening portion 1 is effectively reduced, and the cost and occupied space of the straightening portion 1 are saved.

[0047] Preferably, although not shown in the figure, the ends of the above-mentioned pole group bodies in the length direction L are provided with pole ears 71, and two adjacent pole group bodies can be overlapped with each other through their respective pole ears 71 to achieve electrical connection, and the pole ears 71 of the two adjacent pole group bodies are overlapped with each other through the connection holes 34 extending along the length direction L, so that the electrical connection between the pole group bodies can be achieved without bending the pole ears 71, thereby reducing the risk of the pole ears 71 breaking due to bending.

[0048] It should be noted that Figure 1 and Figure 2 In the long cell structure shown, the pole group body has been hidden in the figure to avoid it from blocking other structures.

[0049] Preferably, if Figures 1 to 5 and Figure 9 As shown, the above-mentioned connecting beam 3 may include a connecting body 31 and a connecting cover plate 32 that can be buckled together along the thickness direction T. The connecting body 31 and the connecting cover plate 32 are arranged to form the above-mentioned connecting hole 34. In this way, on the one hand, the detachable structure of the connecting cover plate 32 structure and the connecting body 31 can effectively facilitate the overlapping of the pole ears 71 of the two adjacent pole group bodies, thereby facilitating the assembly operation of the long battery cell structure; on the other hand, the buckling structure of the connecting body 31 and the connecting cover plate 32 can effectively insulate the pole ears 71 of the two adjacent pole group bodies that are overlapped with each other, thereby improving the insulation of the long battery cell structure.

[0050] Preferably, if Figure 5 As shown, the above-mentioned connecting hole 34 can be provided on the above-mentioned connecting cover plate 32. In other words, the side of the above-mentioned connecting cover plate 32 facing the connecting body 31 is provided with a groove body open to the connecting body 31, and the side of the above-mentioned connecting body 31 facing the connecting cover plate 32 is a smooth side surface. In this way, when the connecting cover plate 32 and the connecting body 31 are in a buckled state, the side surfaces of the groove body and the connecting body 31 are surrounded to form the above-mentioned connecting hole 34, thereby simplifying the manufacturing process of the connecting beam 3.

[0051] However, the connection hole 34 is not limited to being provided in the connection cover 32 . As long as the pole ears 71 between two adjacent pole group bodies can be overlapped, the connection hole 34 can also be provided in the connection body 31 or between the connection body 31 and the connection cover 32 .

[0052] Optionally, the size of the connecting hole 34 in the thickness direction T (ie Figure 3 The S value shown) can be 0.5mm to 1.5mm.

[0053] Preferably, if Figure 9 As shown, the connecting body 31 may extend along the width direction W, and the connecting body 31 may be a hollow structure, so as to reduce the mass of the connecting beam 3 and further improve the capacity density of the battery.

[0054] Preferably, if Figures 1 to 5 and Figure 9 As shown, the connecting body 31 is provided with a first clamping portion 33 at both ends in the width direction W, and the straightening portion 1 is provided with a second clamping portion 11 at the corresponding position. The connecting beam 3 and the straightening portion 1 can be clamped via the first clamping portion 33 and the second clamping portion 11.

[0055] Alternatively, as Figures 1 to 5 As described above, the first clamping portion 33 may be a clamping protrusion, and the second clamping portion 11 may be a clamping hole or a clamping groove adapted to the clamping protrusion.

[0056] Optionally, not shown in the figures, the first clamping portion 33 may be a clamping hole or a clamping groove, and the second clamping portion 11 may be a clamping protrusion adapted to the clamping hole or the clamping groove.

[0057] Preferably, if Figure 1 and Figure 4 As shown, the above-mentioned long battery cell structure can also include a clamping end plate 2, which is arranged at both ends of the pole group assembly in the length direction L, and the straightening parts 1 on both sides of the pole group assembly in the width direction W are clamped with the clamping end plate 2. In this way, on the one hand, the clamping end plate 2 and the straightening part 1 can be clamped around the pole group assembly for a circle, thereby effectively limiting the pole group assembly; on the other hand, the bending strength of the straightening part 1 is further improved, thereby improving the bending resistance of the long battery cell structure.

[0058] Preferably, if Figure 1 and Figure 4 As shown, the end of the straightening portion 1 in the length direction L can be provided with a claw 12, and the corresponding position of the above-mentioned clamping end plate 2 can be provided with a clamping groove 22 adapted to the claw 12, so as to realize the clamping of the straightening portion 1 and the clamping end plate 2 through the clamping of the claw 12 and the clamping groove 22.

[0059] Preferably, the thickness of the above-mentioned clamping end plate 2 can be 0.2 mm to 0.5 mm, so as to take into account both the supporting strength and space utilization of the clamping end plate 2.

[0060] Preferably, if Figure 1 and Figure 2 As shown, the above-mentioned long battery cell structure may further include a cover plate 4, which is provided on the side of the snap-in end plate 2 facing away from the pole group assembly. The snap-in end plate 2 is provided with a threading hole 21 passing through the snap-in end plate 2 along the length direction L. The pole group assembly is electrically connected to the cover plate 4 via the threading hole 21. In this way, on the one hand, the assembly of the pole group assembly and the cover plate 4 is realized; on the other hand, insulation between the cover plate 4 and the pole group assembly is realized through the above-mentioned snap-in end plate 2, thereby effectively saving the lower plastic structure of the battery cell and further improving the space utilization rate of the long battery cell structure.

[0061] Preferably, if Figure 1 、 Figure 2 and Figure 4 As shown, the cover plate 4 may further include a pole 41 , and the cover plate 4 is electrically connected to the pole group assembly via the pole 41 .

[0062] In an embodiment, Figure 6 and Figure 7As shown, the long cell structure may further include a housing 5, in which the electrode group assembly, the straightening portion 1, and the connecting beam 3 are disposed. Correspondingly, the cover plate 4 may also be disposed on both ends of the housing 5 in the length direction L to enclose and form a sealed space for accommodating the electrode group assembly, the straightening portion 1, and the connecting beam 3.

[0063] Preferably, if Figure 6 As shown, the long battery cell structure may further include an explosion-proof valve. The housing 5 is provided with an explosion-proof opening 61 , and the explosion-proof valve cover is provided on the explosion-proof opening 61 to achieve pressure relief in the enclosed space to ensure the safety of the long battery cell structure.

[0064] Preferably, if Figure 7 As shown, the shell 5 may further include a protective sticker 62, which is attached to the explosion-proof opening 61 from the inner side of the shell 5. The protective sticker 62 is provided with a breathable portion 621 that penetrates the protective sticker 62. Thus, on the one hand, attaching the protective sticker 62 to the explosion-proof opening 61 from the inner side of the shell 5 can effectively prevent the pole group assembly from scratching the explosion-proof valve during the process of the pole group assembly penetrating the shell 5; on the other hand, the breathable portion 621 of the protective sticker 62 can effectively ensure the smooth exhaust of the explosion-proof valve.

[0065] Alternatively, as Figure 8 As shown, the ventilation portion 621 may be a cutting line. However, the present invention is not limited thereto, and the ventilation portion 621 may also be a ventilation hole or a ventilation mesh.

[0066] Preferably, if Figure 6 As shown, the explosion-proof opening 61 may be provided on a side surface of the housing 5 in the width direction W.

[0067] Preferably, if Figure 6 As shown, there can be multiple explosion-proof openings 61 , which can be spaced apart along the length direction L to improve the safety of the long battery cell structure. Correspondingly, each explosion-proof opening 61 is provided with the explosion-proof valve.

[0068] Preferably, if Figure 6 As shown, taking the example of two pole group bodies shown in the figure, preferably, the shell 5 is provided with an explosion-proof port 61 at a position corresponding to the middle of each pole group body in the length direction L to ensure smooth exhaust of each pole group body.

[0069] Optionally, the long cell structure may further include an insulating film, and the electrode group assembly, the straightening portion 1 and the connecting beam 3 are coated on the inner side of the insulating film to achieve insulation between the electrode group assembly and the shell 5 .

[0070] An embodiment of the second aspect of the present application further provides a battery, comprising the long cell structure described in any of the above embodiments, and thus having all the beneficial technical effects of the long cell structure, which will not be repeated here.

[0071] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A long battery cell structure, characterized in that: The long cell structure has a length direction, the long cell structure includes a pole group assembly, and the pole group assembly includes a plurality of pole group bodies sequentially arranged along the length direction; The long cell structure further includes at least two straightening portions and a plurality of connecting beams, wherein the straightening portions extend along the length direction and are arranged on both sides of the electrode group assembly in the width direction, and the connecting beams connect the straightening portions located on both sides of the electrode group assembly in the width direction, and the width direction intersects the length direction; The connecting beam is provided between two adjacent pole group bodies. The connecting beam is provided with a connecting hole penetrating the connecting beam along the length direction. The two adjacent pole group bodies are electrically connected via the connecting hole.

2. The long battery cell structure according to claim 1, characterized in that: The connecting beam includes a connecting body and a connecting cover plate that can be buckled with each other along the thickness direction. The connecting body and the connecting cover plate are arranged to form the connecting hole. The thickness direction intersects with a plane determined by the length direction and the width direction.

3. The long battery cell structure according to claim 2, characterized in that: The connecting body is provided with first clamping parts at both ends in the width direction, and second clamping parts are provided at corresponding positions of the straightening part. The connecting beam and the straightening part are clamped together via the first clamping parts and the second clamping parts.

4. The long battery cell structure according to claim 2, characterized in that: The connection hole is provided on the connection cover plate.

5. The long battery cell structure according to any one of claims 1 to 4, characterized in that: It also includes a snap-on end plate, which is arranged at both ends of the pole group assembly in the length direction, and the straightening parts located on both sides of the pole group assembly in the width direction are snap-on to the snap-on end plate.

6. The long battery cell structure according to claim 5, characterized in that: It also includes a cover plate, which is arranged on the side of the clamping end plate facing away from the pole group assembly. The clamping end plate is provided with a wire through hole passing through the clamping end plate along the length direction, and the pole group assembly is electrically connected to the cover plate via the wire through hole.

7. The long battery cell structure according to any one of claims 1 to 4, characterized in that: It also includes a shell and an explosion-proof valve, and the pole group assembly, the straightening part and the connecting beam are arranged in the shell; The shell is provided with an explosion-proof opening, and the explosion-proof valve cover is arranged on the explosion-proof opening.

8. The long battery cell structure according to claim 7, characterized in that: The shell further includes a protective patch, which is attached to the explosion-proof opening from the inner side of the shell, and the protective patch is provided with a vent portion passing through the protective patch.

9. The long battery cell structure according to claim 7, characterized in that: The explosion-proof opening is provided on a side surface of the shell in the width direction; There are multiple explosion-proof openings, and each explosion-proof opening is provided at a position of the shell corresponding to the middle of each pole group body in the longitudinal direction.

10. A battery, characterized in that: The long battery cell structure comprises the long battery cell structure according to any one of claims 1 to 9.

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