Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a pole group assembly and a side plate, wherein at least one side of the pole group assembly is provided with a side plate along a first preset direction, and the side plate is provided with a mounting lug boss; the pole group assembly comprises a plurality of pole groups which are sequentially arranged along a second preset direction, a mounting lug boss is arranged between any two adjacent pole groups, and an accommodating cavity and an opening communicated with the accommodating cavity are formed in the mounting lug boss; and the close tab clusters of two adjacent pole groups respectively extend into the accommodating cavity through the corresponding openings. Therefore, the whole pole group is designed to be of a split structure, the length of a single pole group is reduced, namely, the length of the pole piece is reduced, the problems of wrinkles, deformation, layer channeling or breakage and the like are not prone to occurring in the pole piece production and later assembly process, the yield is improved, the overall strength is improved, and the pressure-resistant performance is improved.

Description

Technical Field

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

[0002] At present, the battery cell structure is generally short, and the overall capacity increase space is limited by process conditions. If the length of the battery cell is increased in order to increase the capacity, and the length of the electrode group is increased, that is, the length of the electrode is increased, then wrinkles, deformation, layer crossover or fractures are likely to occur during the production and subsequent assembly of the electrode, resulting in a reduction in yield. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell which, to a certain extent, solves the technical problem in the prior art that in order to increase the capacity, the battery cell needs to be designed to be longer, thereby increasing the length of the electrode group, that is, increasing the length of the electrode sheet, which is prone to wrinkles, deformation, layer crossover or breakage during the production and subsequent assembly of the electrode sheet, resulting in a reduced yield.

[0004] The present application provides a battery cell, comprising: a pole group assembly and a side plate; wherein, along a first preset direction, the side plate is provided on at least one side of the pole group assembly, and the side plate is formed with a mounting protrusion; the pole group assembly comprises a plurality of pole groups arranged sequentially along a second preset direction, and the mounting protrusion is provided between any two adjacent pole groups, the mounting protrusion is formed with a accommodating cavity and an opening connected to the accommodating cavity, and the pole ear clusters of the two adjacent pole groups that are close to each other extend into the accommodating cavity through the corresponding openings respectively.

[0005] In the above technical solution, further, the opening includes an end opening and a side opening, and along the first preset direction, at least the end of the mounting protrusion away from the side plate is formed with the end opening, and along the second preset direction, the side openings are formed on both opposite sides of the mounting protrusion.

[0006] In any of the above technical solutions, further, along the first preset direction, the accommodating cavity runs through both ends of the mounting protrusion, and the end openings are respectively formed at both ends of the mounting protrusion.

[0007] In any of the above technical solutions, further, the side plate is formed with a first exhaust through hole, and the first exhaust through hole is connected to the adjacent end opening to form an exhaust channel.

[0008] In any of the above technical solutions, further, the battery cell further includes an insulating film, an explosion-proof valve and a shell; wherein the insulating film is wrapped around the assembly of the electrode group component and the side plate, and is installed as a whole in the shell;

[0009] The explosion-proof valve is installed on a side of the housing close to the side plate, and the explosion-proof valve can be connected to the first exhaust hole on the side plate through the second exhaust hole on the insulating film.

[0010] In any of the above technical solutions, further, the battery core also includes a protective layer, the protective layer is arranged on the inner wall of the shell and corresponds to the explosion-proof valve, and the protective layer is formed with an exhaust slit.

[0011] In any of the above technical solutions, further, along the second preset direction, the explosion-proof valve is provided at a middle position of the housing corresponding to any of the pole groups.

[0012] In any of the above technical solutions, further, an arc-shaped rounded corner is formed at one end of the side opening close to the end opening.

[0013] In any of the above technical solutions, further, along the first preset direction, the side plates are provided on the opposite sides of the pole group assembly, and any of the side plates is formed with the mounting protrusion, and the ends of the two mounting protrusions are abutted against each other.

[0014] In any of the above technical solutions, further, one of any two adjacent electrode groups forms an L-shaped positive electrode ear cluster, and one of any two adjacent electrode groups forms an L-shaped negative electrode ear cluster, and the positive electrode ear cluster and the negative electrode ear cluster are overlapped together and connected by welding.

[0015] In any of the above technical solutions, further, the side panels and the mounting protrusions are made of insulating materials.

[0016] In any of the above technical solutions, further, the battery cell also includes a protective end plate, and along the second preset direction, at least one end of the pole group assembly is provided with the protective end plate, and any of the protective end plates is formed with an avoidance gap; the side plate is clamped with the protective end plate.

[0017] In any of the above technical solutions, further, a buckle is formed on one of the side plate and the protective end plate, a slot is formed on the other of the side plate and the protective end plate, and the buckle can be snapped into the slot.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The present application provides a longer battery cell, thereby achieving an overall capacity increase, and designs the overall electrode group inside the battery cell into a split structure, with a mounting protrusion provided on the side, and the mounting protrusion extending between adjacent electrode groups, and the mounting protrusion openings opening a receiving cavity and an opening, so that the electrode lug cluster can extend into the receiving cavity, thereby providing an installation space for the electrode lug cluster, playing a role in protecting the electrode group cluster and avoiding crushing the electrode lug cluster, thereby making it possible to achieve docking of the two electrode groups.

[0020] It can be seen that the overall pole group is designed as a split structure, which reduces the length of a single pole group, that is, reduces the length of the pole piece, and is less likely to cause wrinkles, deformation, layer crossover or breakage during pole piece production and subsequent assembly, thereby helping to improve the yield rate and reduce costs. Moreover, a mounting protrusion is provided between the two pole groups to improve the overall strength and the pressure resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 An exploded view of a battery cell provided in an embodiment of the present application;

[0023] Figure 2 An assembly diagram of the side panels and protective end panels provided in an embodiment of the present application;

[0024] Figure 3 for Figure 2 Schematic diagram of a local enlarged structure;

[0025] Figure 4 for Figure 3 Another partially enlarged structural schematic diagram;

[0026] Figure 5 A schematic structural diagram of the side panel provided in an embodiment of the present application;

[0027] Figure 6 for Figure 5 Schematic diagram of a local enlarged structure;

[0028] Figure 7 for Figure 5 Another partially enlarged structural schematic diagram;

[0029] Figure 8 A schematic structural diagram of a protective end plate provided in an embodiment of the present application;

[0030] Figure 9 An exploded view of a housing provided in an embodiment of the present application;

[0031] Figure 10 An assembly diagram of a housing provided in an embodiment of the present application;

[0032] Figure 11 for Figure 10 Cross-sectional view along section AA;

[0033] Figure 12 for Figure 11 A schematic diagram of the enlarged structure at B;

[0034] Figure 13 A protective layer provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 1-pole group assembly, 11-pole group, 111-pole ear cluster, 2-side plate, 21-mounting boss, 22-opening, 221-end opening, 222-side opening, 23-first exhaust hole, 24-clip, 3-insulating film, 4-explosion-proof valve, 5-housing, 6-protective layer, 61-exhaust slit, 7-protective end plate, 71-slot, 72-avoidance gap, 8-cover assembly. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Refer to the following Figures 1 to 13 The battery cell according to some embodiments of the present application is described.

[0043] See also Figures 1 to 3 、 Figure 5 、 Figure 6 As shown, an embodiment of the present application provides a battery cell, comprising: an electrode assembly 1 and a side plate 2; wherein, along a first preset direction a, the side plate 2 is provided on at least one side of the electrode assembly 1, and the side plate 2 is formed with a mounting protrusion 21;

[0044] The pole group assembly 1 includes a plurality of pole groups 11 arranged in sequence along a second preset direction b, and a mounting protrusion 21 is provided between any two adjacent pole groups 11, the mounting protrusion 21 forms a accommodating cavity and an opening 22 connected to the accommodating cavity, and the pole ear clusters 111 close to each other of the two adjacent pole groups 11 extend into the accommodating cavity through the corresponding openings 22 respectively.

[0045] According to the structure described above, the present application provides a longer battery cell, thereby achieving an overall capacity increase, and the overall pole group 11 inside the battery cell is designed as a split structure, and a mounting protrusion 21 is provided on the side, and the mounting protrusion 21 is extended between adjacent pole groups 11, and the mounting protrusion 21 opens a accommodating cavity and an opening 22, so that the pole ear cluster 111 can extend into this accommodating cavity, thereby providing an installation space for the pole ear cluster 111, playing a role in protecting the pole ear cluster 111 and avoiding crushing the pole ear cluster 111, thereby providing the possibility of docking the two pole groups 11.

[0046] It can be seen that the overall pole group 11 is designed as a split structure, which reduces the length of a single pole group 11, that is, reduces the length of the pole piece, and is less likely to cause wrinkles, deformation, layer crossover or breakage during pole piece production and subsequent assembly, thereby helping to improve the yield rate and reduce costs. Moreover, a mounting protrusion 21 is provided between the two pole groups 11 to improve the overall strength and the pressure resistance performance.

[0047] Furthermore, preferably, the aforementioned side panel 2 is provided on at least one narrow side of the electrode assembly 1. This narrow side specifically refers to the narrow, elongated side formed by the long and wide sides, which improves the ease of inserting the electrode assembly 1 into the housing. The side panel 2 is not provided on the large side of the electrode assembly 1, which does not affect heat dissipation and improves the safety and reliability of the battery cell. Of course, this is not limited to this, and the side panel 2 can also be provided on the large side of the electrode assembly 1, i.e., the larger side formed by the long and high sides.

[0048] Furthermore, preferably, the length direction of the pole group 11 is the same as the second preset direction b, and the height direction of the pole group 11 is the same as the first preset direction a. Of course, this is not limited thereto.

[0049] Furthermore, preferably, the mounting protrusion 21 and the side panel 2 can be integrally formed by injection molding. Of course, the present invention is not limited thereto, and the molding method can be selected according to actual needs.

[0050] In this embodiment, preferably, Figure 3 、 Figure 5 and Figure 6 As shown, the opening 22 includes an end opening 221 and a side opening 222, and along the first preset direction a, at least one end of the mounting protrusion 21 away from the side plate 2 is formed with an end opening 221, and along the second preset direction b, side openings 222 are formed on both opposite sides of the mounting protrusion 21.

[0051] According to the structure described above, the end opening 221 and the side opening 222 are provided so that part of the structure of the two tab clusters 111 on both sides extends from the corresponding side opening 222 and end opening 221 into the accommodating cavity to avoid interference.

[0052] In this embodiment, preferably, Figure 3 and Figure 6 As shown, along the first preset direction a, the accommodating cavity passes through both ends of the mounting protrusion 21 , and end openings 221 are formed at both ends of the mounting protrusion 21 .

[0053] According to the structure described above, the accommodating cavity is provided along the entire length direction of the mounting boss 21, which contributes to lightweight design and provides sufficient space for accommodating the tab cluster 111. In addition, an exhaust channel can be formed to facilitate exhaust during thermal runaway.

[0054] It should be noted that: along the first preset direction a, the accommodating cavity may also only penetrate the end of the mounting protrusion 21 away from the side plate 2, while the end close to the side plate 2 is closed. In this case, no exhaust channel connecting the left and right sides of the electrode assembly 1 will be formed.

[0055] In this embodiment, preferably, Figure 3 and Figure 6 As shown, the side plate 2 is formed with a first exhaust through hole 23 , and the first exhaust through hole 23 is communicated with the adjacent end opening 221 to form an exhaust passage.

[0056] According to the structure described above, the two sides of the electrode assembly 1 are connected together through the exhaust channel. No matter where thermal runaway occurs on the left or right side of the electrode assembly 1, rapid exhaust can be achieved, thereby improving the safety and reliability of the battery cell during use.

[0057] In this embodiment, preferably, Figure 1 As shown, the battery cell further includes an insulating film 3, an explosion-proof valve 4 and a shell 5; wherein the insulating film 3 is wrapped around the assembly of the electrode group component 1 and the side plate 2, and the whole is installed in the shell 5;

[0058] The explosion-proof valve 4 is installed on a side of the housing 5 close to the side plate 2 , and the explosion-proof valve 4 can be connected to the first exhaust hole 23 on the side plate 2 through the second exhaust hole on the insulating film 3 .

[0059] According to the structure described above, along the first preset direction a, the two sides of the electrode group 11 can be connected through the aforementioned exhaust channel, and in conjunction with the explosion-proof valve 4 on the side, the high-temperature gas in thermal runaway can be quickly discharged.

[0060] Furthermore, along the second predetermined direction b, an explosion-proof valve 4 is provided at the center of the housing 5 corresponding to each electrode group 11. As can be seen, the installation of the explosion-proof valve 4 at the center of the electrode group 11 ensures that both sides of the explosion-proof valve 4 have the same exhaust stroke, thereby enabling rapid exhaust regardless of where thermal runaway occurs. Of course, the installation location of the explosion-proof valve 4 is not limited to the above; the explosion-proof valve 4 can also be installed at locations of the housing 5 that are adjacent to two electrode groups 11, and so on.

[0061] In this embodiment, preferably, Figures 9 to 13 As shown, the battery cell further includes a protective layer 6 , which is disposed on the inner side wall of the housing 5 and corresponds to the explosion-proof valve 4 , and an exhaust slit 61 is formed on the protective layer 6 .

[0062] According to the structure described above, a protective layer 6 is provided inside the shell 5 to prevent the electrode group 11 from damaging the explosion-proof valve 4, and an exhaust slit 61 is provided on the protective layer 6 to ensure normal exhaust when the battery cell thermally runs away, thereby improving the safety and reliability of the battery cell during use.

[0063] Furthermore, preferably, the material of the protective layer 6 can be plastic sheet or rubber, etc., and the specific design is based on actual needs.

[0064] In this embodiment, preferably, Figure 6 As shown, an end of the side opening 222 close to the end opening 221 is formed with an arc-shaped rounded corner to prevent the sharp corner from scratching the tab cluster 111 and play a role in protecting the tab cluster 111.

[0065] In this embodiment, preferably, Figures 1 to 3 As shown, along the first preset direction a, side plates 2 are provided on opposite sides of the pole group assembly 1 , and each side plate 2 is formed with a mounting protrusion 21 , and the ends of the two mounting protrusions 21 are pressed against each other.

[0066] According to the structure described above, two side panels 2 are used to guide and protect the left and right sides of the pole group assembly 1 when entering the shell, and a mounting protrusion 21 is provided on each side panel 2. The ends of the two mounting protrusions 21 are abutted against each other, and the accommodating cavity of the two mounting protrusions 21 can accommodate the entire pole ear cluster 111, playing a role of all-round protection. In addition, the provision of two side panels 2 and the mounting protrusions 21 helps to improve the overall strength.

[0067] It should be noted that the number of side panels 2 is not limited to two, but can also be one, depending on actual needs. Preferably, when the number of side panels 2 is one, the mounting protrusion 21 on the side panel 2 can be lengthened to accommodate a longer tab cluster 111. Of course, it is not limited to this, and can also be designed according to actual needs.

[0068] In this embodiment, preferably, Figures 1 to 3 As shown, the side plate 2 is formed with a plurality of notches arranged in sequence along the second preset direction b, that is, the side plate 2 presents a structure of alternating wide and narrow sections, which helps to exhaust the battery cell when thermal runaway occurs. Of course, this is not limited to this.

[0069] In this embodiment, preferably, Figure 3 As shown, one of any two adjacent electrode groups 11 forms an L-shaped positive electrode ear cluster, and one of any two adjacent electrode groups 11 forms an L-shaped negative electrode ear cluster, and the positive electrode ear cluster and the negative electrode ear cluster are overlapped together and connected by welding.

[0070] According to the structure described above, the positive electrode ear cluster and the negative electrode ear cluster of the two-pole group 11 are directly overlapped together, reducing structures such as connecting plates, reducing internal resistance, and at the same time saving the length of the ear cluster 111, reducing the space inside the battery cell, and helping to increase the capacity of the battery cell.

[0071] In this embodiment, preferably, Figure 2 and Figure 4 As shown, the battery cell further includes a protective end plate 7, and along the second preset direction b, protective end plates 7 are provided at both ends of the pole group assembly 1, and any protective end plate 7 is formed with an avoidance gap 72; the side plate 2 is clamped with the protective end plate 7.

[0072] According to the structure described above, protective end plates 7 are provided at both ends of the pole group assembly 1 to ensure thrust balance when the pole enters the shell, and the side plates 2 are connected to the protective end plates 7, which has higher overall strength, better fixation and protection effect on the pole group assembly 1, and can also play a role in insulation protection.

[0073] Furthermore, preferably, the material of the protective end plate 7 can be rubber or plastic, etc., which can be selected according to actual needs.

[0074] It should be noted that the protective end plates 7 are not limited to being provided at both ends of the pole group assembly 1 , but may also be provided at only one end of the pole group assembly 1 along the second preset direction b, depending on actual needs.

[0075] In this embodiment, preferably, Figure 4 、 Figure 7 and Figure 8 As shown, the side plate 2 is formed with a buckle 24 , the protective end plate 7 is formed with a slot 71 , and the buckle 24 can be snapped into the slot 71 .

[0076] According to the structure described above, the buckle 24 can be snapped into the slot 71, thereby realizing the assembly of the side panel 2 and the protective end panel 7. The operation is simple and convenient, saving time and effort. After assembly, the overall structure is stronger and more stable. Moreover, the protective end panel 7 and the side panel 2 adopt a detachable connection method, which is repeatable.

[0077] It should be noted that: it is not limited to the above-mentioned structure of "providing a buckle 24 on the side panel 2 and a slot 71 on the protective end panel 7", and the buckle 24 can also be provided on the protective end panel 7 and the slot 71 can be provided on the side panel 2, and the specific design is based on actual needs.

[0078] In this embodiment, preferably, Figure 1As shown, the number of pole groups 11 is two. Of course, it is not limited to this. The number of pole groups 11 can be more than two, such as three, four, five or six, etc., which can be selected according to actual needs. Preferably, the aforementioned mounting protrusion 21 is provided between any two adjacent pole groups 11.

[0079] In this embodiment, preferably, Figure 1 As shown, the battery cell further includes a cover assembly 8 , and preferably, openings 22 are formed at both ends of the housing 5 , and the openings 22 are each equipped with a cover assembly 8 .

[0080] In this embodiment, preferably, Figure 1 As shown, the side plate 2 and the mounting protrusion 21 thereon are both made of insulating materials to avoid short circuits, which is a basic requirement of the battery and will not be described in detail here.

[0081] 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 battery cell, characterized in that: include: A pole group assembly and a side plate; wherein, along a first preset direction, at least one side of the pole group assembly is provided with the side plate, and the side plate is formed with a mounting protrusion; The pole group assembly includes a plurality of pole groups arranged in sequence along a second preset direction, and an installation protrusion is provided between any two adjacent pole groups, the installation protrusion forms a accommodating cavity and an opening connected to the accommodating cavity, and the pole ear clusters close to each other of the two adjacent pole groups extend into the accommodating cavity through corresponding openings respectively.

2. The battery cell according to claim 1, characterized in that The opening includes an end opening and a side opening, and along the first preset direction, at least the end of the mounting protrusion away from the side plate is formed with the end opening, and along the second preset direction, the side openings are formed on both opposite sides of the mounting protrusion.

3. The battery cell according to claim 2, characterized in that Along the first preset direction, the accommodating cavity passes through both ends of the mounting protrusion, and the end openings are respectively formed at both ends of the mounting protrusion.

4. The battery cell according to claim 3, characterized in that The side plate is formed with a first exhaust through hole, and the first exhaust through hole is communicated with the adjacent end opening to form an exhaust passage.

5. The battery cell according to claim 4, characterized in that: The battery cell further includes an insulating film, an explosion-proof valve, and a shell; wherein the insulating film is wrapped around the assembly of the electrode group component and the side plate, and is integrally installed in the shell; The explosion-proof valve is installed on a side of the housing close to the side plate, and the explosion-proof valve can be connected to the first exhaust hole on the side plate through the second exhaust hole on the insulating film.

6. The battery cell according to claim 5, characterized in that The battery core further includes a protective layer, which is arranged on the inner side wall of the shell and corresponds to the explosion-proof valve, and the protective layer is formed with an exhaust slit; and / or Along the second preset direction, the explosion-proof valve is provided at a middle position of the housing corresponding to any one of the pole groups.

7. The battery cell according to claim 2, characterized in that An end of the side opening close to the end opening is formed with an arc-shaped rounded corner.

8. The battery cell according to claim 1, characterized in that Along the first preset direction, the side plates are provided on both opposite sides of the pole group assembly, and any of the side plates is formed with the mounting protrusion, and the ends of the two mounting protrusions are abutted against each other; and / or One of any two adjacent electrode groups forms an L-shaped positive electrode ear cluster, and one of any two adjacent electrode groups forms an L-shaped negative electrode ear cluster, and the positive electrode ear cluster and the negative electrode ear cluster are overlapped and connected by welding; and / or The side plates and the mounting protrusions are both made of insulating materials.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell also includes a protective end plate, and along the second preset direction, at least one end of the pole group assembly is provided with the protective end plate, and any of the protective end plates is formed with an avoidance gap; the side plate is clamped with the protective end plate.

10. The battery cell according to claim 9, characterized in that: A buckle is formed on one of the side plate and the protective end plate, and a slot is formed on the other of the side plate and the protective end plate, and the buckle can be snapped into the slot.

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