Long battery cell device and battery

Abstract

The utility model relates to the technical field of battery cells, in particular to a long battery cell device and a battery, and the long battery cell device comprises a battery cell assembly and a side plate assembly. The battery cell assembly comprises a plurality of pole groups which are sequentially and electrically connected in the first direction, the side plate assembly comprises two insulating side plates and two insulating end plates, the two insulating side plates extend in the first direction and are attached to the two sides of the battery cell assembly in the second direction respectively, and the two insulating end plates are arranged on the two sides of the battery cell assembly in the first direction; and the insulating end plates are respectively connected with the two insulating side plates, so that the two insulating side plates and the two insulating end plates are encircled to form a hoop ring hooped at the periphery of the battery cell assembly. According to the long battery cell device and the battery provided by the invention, the bending probability of the pole group is reduced, and the bending strength of the pole group is improved, so that the probability of undesirable occurrence of wrinkles, deformation, layer channeling, breakage and the like caused by overlarge length of the pole piece is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery cells, and particularly to a long battery cell device and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. In order to meet the requirements of high voltage and long driving range of automobiles and have lower costs, battery manufacturers increase the energy density of single cells by increasing the length of single cells.

[0003] However, increasing the length of a single cell results in a relatively large length dimension of the long battery cell structure (for example, the length of a single cell is greater than or equal to 400 mm). Correspondingly, the length dimension of its electrode group is also relatively large (for example, the battery cell described in Chinese Patent Document CN211480207U, long battery cell electrode group, long battery, battery module, and power battery). This makes it extremely easy for the electrode group to bend and deform during the assembly process of the single cell, resulting in poor assembly of the single cell, as well as problems such as wrinkles, deformation, layer displacement, and fracture caused by the excessive length of the electrode sheet. Summary of the Utility Model

[0004] The purpose of the present application is to provide a long battery cell device and a battery, which can, to a certain extent, solve the technical problems existing in the prior art that in order to meet the requirements of high voltage and long driving range of automobiles and have lower costs, battery manufacturers increase the energy density of single cells by increasing the length of single cells. However, increasing the length of a single cell results in a relatively large length dimension of the long battery cell structure, which makes it extremely easy for the electrode group to bend and deform during the assembly process of the single cell, resulting in poor assembly of the single cell, as well as problems such as wrinkles, deformation, layer displacement, and fracture caused by the excessive length of the electrode sheet.

[0005] According to a first aspect of the present application, a long battery cell device is provided, including a battery cell assembly and a side plate assembly. The battery cell assembly includes a plurality of electrode groups electrically connected in sequence along a first direction. The 5 side plate assembly includes two insulating side plates and two insulating end plates. The two insulating side plates extend along the first direction and are respectively attached to both sides of the battery cell assembly in a second direction. The two insulating end plates are disposed on both sides of the battery cell assembly in the first direction, and the insulating end plates are respectively connected to the two insulating side plates, so that the two insulating

[0006] side plates and the two insulating end plates enclose a hoop formed around the battery cell assembly. The 0 first direction intersects with the second direction.

[0007] Preferably, electrode tabs are led out from both ends of the electrode group in the first direction;

[0008] The insulating side plate includes a supporting ear and a side plate body fixedly connected to each other. The side plate body extends along the first direction, and the supporting ear is arranged on the side of the side plate body facing the

[0009] electrode core assembly, and the supporting ear is arranged between two adjacent electrode groups to support the electrode tabs of the electrode groups.

[0010] Preferably, the supporting ear is provided with a communication groove penetrating the supporting ear along the first direction, and the electrode tabs of two adjacent electrode groups are overlapped via the communication groove.

[0011] Preferably, the communication groove forms an opening on one side of the supporting ear in the third direction,

[0012] wherein the third direction intersects the plane determined by the first direction and the second direction;

[0013] It further includes an insulating sticker which can cover the opening.

[0014] Preferably, in the second direction, the size of the electrode core assembly is greater than or equal to twice the size of the supporting ear.

[0015] Preferably, it further includes a cover plate which is covered on the side of the insulating end plate facing away from the electrode core assembly. The insulating end plate is provided with a wire passing hole penetrating the insulating end plate along the first direction, and the electrode core assembly is electrically connected to the cover plate via the wire passing hole.

[0016] Preferably, it further includes a housing and an explosion-proof valve. The electrode core assembly and the side plate assembly are arranged in the housing;

[0017] The housing is provided with an explosion-proof port, and the explosion-proof valve is covered on the explosion-proof port.

[0018] Preferably, the housing further includes a protective sticker which is attached to the explosion-proof port from the inside of the housing, and the protective sticker is provided with a ventilation part penetrating the protective sticker.

[0019] Preferably, the explosion-proof port is arranged on the side surface of the housing in the second direction.

[0020] According to the second aspect of the present application, a battery is provided, which includes the long electrode core device described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the long electrode core device, and will not be elaborated here.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] The long battery cell device provided by the present application, on the one hand, sets the battery cell assembly into a combined structure of multiple pole groups electrically connected in sequence along the first direction. Thus, while taking into account the high energy density of the battery cell assembly, the length dimension of the pole group is effectively shortened to reduce the probability of the pole group bending. On the other hand, two insulating side plates are respectively attached to both sides of the battery cell assembly in the second direction, and two insulating end plates are used to connect the two insulating side plates, so that the insulating side plates can always be attached to the side of the pole group. Then, the pole group is straightened by the insulating side plates, thereby improving the bending resistance strength of the pole group.

[0023] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, provides a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Isometric structural schematic diagram of the long battery cell device provided by the embodiment of the present application;

[0026] Figure 2 For Figure 1 Enlarged structural schematic diagram of the long battery cell device at A;

[0027] Figure 3 For Figure 1 Enlarged structural schematic diagram of the long battery cell device at B;

[0028] Figure 4 For Figure 1 Enlarged structural schematic diagram of the long battery cell device at C;

[0029] Figure 5 Isometric structural schematic diagram of the insulating side plate provided by the embodiment of the present application;

[0030] Figure 6 Isometric structural schematic diagram of the insulating end plate provided by the embodiment of the present application;

[0031] Figure 7 Front view structural schematic diagram of the long battery cell device provided by the embodiment of the present application;

[0032] Figure 8 Bottom view structural schematic diagram of the long battery cell device provided by the embodiment of the present application;

[0033] Figure 9 The top view structural schematic diagram of the long battery cell device provided by the embodiment of the present application;

[0034] Figure 10 The sectional view structural schematic diagram of the explosion-proof port provided by the embodiment of the present application.

[0035] Reference numerals:

[0036] 11 - Side plate body; 111 - Fitting piece; 112 - Fitting rib; 113 - Claw; 12 - Supporting ear; 121 - Vent hole; 122 - Connecting groove; 13 - Insulating end plate; 131 - Wire passing hole; 132 - Card slot; 21 - Electrode group; 22 - Electrode tab; 3 - Insulating sticker; 4 - Cover plate; 41 - Terminal post; 5 - Housing; 51 - Explosion-proof port; 6 - Explosion-proof valve; 7 - Protective sticker.

[0037] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed implementation manners

[0038] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0039] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0040] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0043] The following refers to Figures 1 to 9 Describe the long battery cell device and battery according to some embodiments of the present application.

[0044] Refer to Figures 1 to 9 As shown, an embodiment of the first aspect of the present application provides a long battery cell device, which includes a battery cell assembly and a side plate assembly. The battery cell assembly includes a plurality of pole groups 21 electrically connected in sequence along a first direction F1. The side plate assembly includes two insulating side plates and two insulating end plates 13. The two insulating side plates extend along the first direction F1 and are respectively attached to both sides of the battery cell assembly in a second direction F2. The two insulating end plates 13 are disposed on both sides of the battery cell assembly in the first direction F1, and the insulating end plates 13 are respectively connected to the two insulating side plates, so that the two insulating side plates and the two insulating end plates 13 enclose a hoop ring that is hoop-mounted around the battery cell assembly. The first direction F1 intersects with the second direction F2.

[0045] For the long battery cell device provided according to the above technical features, on the one hand, the battery cell assembly is set as a combined structure of a plurality of pole groups 21 electrically connected in sequence along the first direction F1. Thus, while taking into account the high energy density of the battery cell assembly, the length dimension of the pole group 21 is effectively shortened to reduce the probability of the pole group 21 bending; on the other hand, the two insulating side plates are respectively attached to both sides of the battery cell assembly in the second direction F2, and the two insulating side plates are connected by the two insulating end plates 13, so that the insulating side plates can always be in contact with the side surface of the pole group 21. Then, the pole group 21 is straightened by the insulating side plates, thereby improving the bending resistance of the pole group 21, and effectively reducing the probability of occurrence of defects such as wrinkles, deformation, layer displacement, and fracture caused by the excessive length of the pole piece.

[0046] As Figures 1 to 9As shown, F1 shown in the figure can be an example of the first direction F1, and F2 shown in the figure can be an example of the second direction F2. Among them, the first direction F1 and the second direction F2 intersect. Preferably, the above-mentioned first direction F1 and the second direction F2 are perpendicular to each other to adapt to the structure of the square shell battery. Correspondingly, the above-mentioned first direction F1 can be the length direction of the square shell battery, and the above-mentioned second direction F2 can be the width direction of the square shell battery. For the convenience of description, the thickness direction of the square shell battery is defined as the third direction F3 (that is, the third direction F3 is perpendicular to the plane determined by the first direction F1 and the second direction F2). F3 shown in the figure can be an example of the third direction F3.

[0047] Preferably, as Figure 1 , Figure 3 and Figure 5 shown, pole lugs 22 can be led out at both ends of the above-mentioned pole group 21 in the first direction F1, so as to facilitate the sequential electrical connection of the pole group 21 along the first direction F1.

[0048] Optionally, as Figure 2 shown, at least part of the pole lugs 22 of two adjacent pole groups 21 can overlap each other along the third direction F3, so as to realize the electrical connection between two adjacent pole groups 21. In this way, the pole lugs 22 of two adjacent pole groups 21 can be overlapped with each other only by extending along the first direction F1, thus effectively avoiding the tearing caused by the bending of the pole lugs 22.

[0049] Preferably, as Figure 1 , Figure 3 and Figure 5 shown, the above-mentioned insulating side plate can include a supporting ear 12 and a side plate body 11 that are fixedly connected to each other. The side plate body 11 extends along the first direction F1. The supporting ear 12 is arranged on the side of the side plate body 11 facing the battery cell assembly, and the supporting ear 12 is arranged between two adjacent pole groups 21 to support the pole lugs 22 of the pole group 21. In this way, by arranging the supporting ear 12 between two adjacent pole groups 21, the bending strength of the long battery cell device at the connection between two adjacent pole groups 21 can be effectively increased, and the long battery cell device can be effectively prevented from bending at the connection between two adjacent pole groups 21.

[0050] Preferably, as Figure 3 and Figure 5 shown, the supporting ear 12 is provided with a communication groove 122 that penetrates the supporting ear 12 along the first direction F1. The pole lugs 22 of two adjacent pole groups 21 are overlapped through the communication groove 122. In this way, not only the stability of the butt joint of the pole lugs 22 of two adjacent pole groups 21 can be effectively protected, but also the probability of the pole lugs 22 being bent and torn can be effectively reduced.

[0051] Preferably, as Figure 3 and Figure 5As shown, the above-mentioned communication groove 122 forms an opening on one side of the supporting ear 12 in the third direction F3. In this way, the overlapping operation of the tab ears 22 of two adjacent pole groups 21 can be effectively facilitated, and thus the assembly process can be simplified.

[0052] Preferably, as Figure 1 and Figure 3 shown, the above-mentioned long battery cell device may further include an insulating sticker 3, and the insulating sticker 3 can cover the opening. In this way, the tab ears 22 in the communication groove 122 can be effectively insulated.

[0053] Optionally, not shown in the figure, both ends of the insulating sticker 3 in the first direction F1 can be respectively attached to two adjacent pole groups 21 to ensure that the insulating sticker 3 can completely cover the opening in the first direction F1.

[0054] Optionally, not shown in the figure, in the second direction F2, the size of the insulating sticker 3 is larger than the opening size of the communication groove 122 to ensure that the insulating sticker 3 can completely cover the opening in the second direction F2.

[0055] Optionally, in the third direction F3, the size of the insulating sticker 3 can be 0.1 mm to 0.3 mm to balance the insulation effect and space occupancy rate of the insulating sticker 3.

[0056] Preferably, as Figure 1 and Figure 3 shown, in the second direction F2, the size of the battery cell assembly is greater than or equal to twice the size of the supporting ear 12. In this way, when two insulating side plates are arranged opposite to each other in the second direction F2, the supporting ears 12 of the two insulating side plates can be effectively prevented from interfering with each other.

[0057] Preferably, as Figure 3 shown, the above-mentioned supporting ear 12 may further be provided with a ventilation hole 121 penetrating the supporting ear 12 in the second direction F2 to facilitate the gas flow at the supporting ear 12.

[0058] Preferably, as Figures 1 to 3 and Figure 5 shown, the above-mentioned side plate body 11 may include a fitting piece 111 and a fitting rib 112 both extending along the first direction F1, and the size of the fitting piece 111 is larger than the size of the fitting rib 112 in the third direction F3. The side plate body 11 is formed by alternately connecting the fitting piece 111 and the fitting rib 112. In this way, while ensuring the fitting area between the side plate body 11 and the side surface of the pole column 41, the material cost and quality of the side plate body 11 can be effectively reduced.

[0059] Preferably, as Figure 4 and Figure 5As shown, clamping claws 113 can be provided at both ends of the above-mentioned side plate body 11 in the first direction F1. Correspondingly, as Figure 6 shown, clamping grooves 132 adapted to the clamping claws 113 are further provided at both ends of the above-mentioned insulating end plate 13 in the second direction F2. As Figure 4 shown, the above-mentioned side plate body 11 and the insulating end plate 13 are connected through the clamping cooperation of the clamping claws 113 and the clamping grooves 132, so as to improve the connection accuracy between the side plate body 11 and the insulating end plate 13.

[0060] Preferably, as Figure 1 、 Figure 2 and Figure 4 shown, the above-mentioned long battery cell device may further include a cover plate 4. The cover plate 4 is covered on the side of the insulating end plate 13 facing away from the battery cell assembly. The insulating end plate 13 is provided with a wire passing hole 131 penetrating the insulating end plate 13 in the first direction F1. The battery cell assembly is electrically connected to the cover plate 4 through the wire passing hole 131. Thus, on the one hand, the assembly of the battery cell assembly and the cover plate 4 is realized; on the other hand, the insulation between the cover plate 4 and the battery cell assembly is realized through the above-mentioned insulating end plate 13, thereby effectively saving the lower plastic part structure of the battery cell and further improving the space utilization rate of the long battery cell device.

[0061] Preferably, as Figure 1 、 Figure 2 and Figure 4 shown, the above-mentioned cover plate 4 may be provided with a pole post 41, and the above-mentioned battery cell assembly can be electrically connected to the pole post 41.

[0062] In the embodiment, as Figures 7 to 10 shown, the above-mentioned long battery cell structure may further include a housing 5, and the above-mentioned battery cell assembly and the side plate assembly are arranged in the housing 5. Correspondingly, the above-mentioned cover plate 4 may also be covered on both ends of the housing 5 in the first direction F1 to enclose a closed space for accommodating both the above-mentioned battery cell assembly and the side plate assembly.

[0063] Preferably, as Figures 7 to 10 shown, the long battery cell structure may further include an explosion-proof valve 6. The housing 5 is provided with an explosion-proof port 51, and the explosion-proof valve 6 is covered on the explosion-proof port 51 to realize the pressure relief of the above-mentioned closed space and ensure the safety of the long battery cell structure.

[0064] Preferably, as Figure 10 shown, the above-mentioned housing 5 may further include a protective sticker 7. The protective sticker 7 is attached to the explosion-proof port 51 from the inside of the housing 5. The protective sticker 7 is provided with a breathable part penetrating the protective sticker 7. Thus, on the one hand, attaching the protective sticker 7 to the explosion-proof port 51 from the inside of the housing 5 can effectively prevent the battery cell assembly from scratching the explosion-proof valve 6 during the process of the battery cell assembly penetrating into the housing 5; on the other hand, through the breathable part of the protective sticker 7, the exhaust smoothness of the explosion-proof valve 6 can be effectively ensured.

[0065] Optionally, not shown in the figure, the above-mentioned air-permeable part may be a cutting line. However, it is not limited thereto, and the above-mentioned air-permeable part may also be a hole or a mesh, etc.

[0066] Preferably, as Figure 8 and Figure 9 shown, the above-mentioned explosion-proof port 51 may be provided on the side surface of the above-mentioned housing 5 in the second direction F2.

[0067] Preferably, as Figure 8 and Figure 9 shown, the number of the above-mentioned explosion-proof ports 51 may be multiple, and the multiple explosion-proof ports 51 may be arranged at intervals in the first direction F1 to improve the safety of the long battery cell structure. Correspondingly, the above-mentioned explosion-proof valve 6 is provided on each explosion-proof port 51.

[0068] Preferably, as Figure 8 and Figure 9 shown, taking the example that the number of the electrode groups 21 shown in the figure is two, preferably, as Figure 8 and Figure 9 shown, define the side walls at both ends of the above-mentioned housing 5 in the second direction F2 as the first side wall and the second side wall respectively. Optionally, as Figure 8 shown, two explosion-proof ports 51 may be provided on the first side wall, and the two explosion-proof ports 51 may be correspondingly arranged at the middle positions of the two electrode groups 21 in the first direction F1 respectively. In this way, it is convenient for the gas located at the middle position of the electrode group 21 in the housing 5 to be discharged. Optionally, as Figure 9 shown, one explosion-proof port 51 may be provided on the second side wall opposite to the above-mentioned supporting ear 12. In this way, it is convenient for the gas at the connection position between two adjacent electrode groups 21 in the housing 5 to be discharged.

[0069] Optionally, the above-mentioned long battery cell structure may further include an insulating film, and both the above-mentioned battery cell assembly and the side plate assembly may be coated on the inner side of the insulating film to achieve insulation between the battery cell assembly and the housing 5.

[0070] An embodiment of the second aspect of the present application further provides a battery, including the long battery cell device described in any one of the above embodiments. Therefore, it has all the beneficial technical effects of the long battery cell device, and details are not described herein again.

[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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A long battery cell device, characterized in that, It includes a battery cell assembly and a side plate assembly. The battery cell assembly includes a plurality of pole groups (21) electrically connected in sequence along a first direction (F1). The side plate assembly includes two insulating side plates and two insulating end plates (13). The two insulating side plates extend along the first direction (F1) and are respectively attached to both sides of the battery cell assembly in a second direction (F2). The two insulating end plates (13) are disposed on both sides of the battery cell assembly in the first direction (F1), and the insulating end plates (13) are respectively connected to the two insulating side plates, so that the two insulating side plates and the two insulating end plates (13) enclose a hoop formed around the periphery of the battery cell assembly. The first direction (F1) intersects with the second direction (F2).

2. The long battery cell device according to claim 1, wherein pole lugs (22) are led out from both ends of the pole group (21) in the first direction (F1); the insulating side plate includes a supporting ear (12) and a side plate body (11) fixedly connected to each other. The side plate body (11) extends along the first direction (F1). The supporting ear (12) is disposed on the side of the side plate body (11) facing the battery cell assembly, and the supporting ear (12) is disposed between two adjacent pole groups (21) for supporting the pole lugs (22) of the pole group (21).

3. The long battery cell device according to claim 2, wherein, The supporting ear (12) is provided with a communication groove (122) penetrating through the supporting ear (12) along the first direction (F1). The pole lugs (22) of two adjacent pole groups (21) are overlapped via the communication groove (122).

4. The long battery cell device according to claim 3, wherein the communication groove (122) forms an opening on one side of the supporting ear (12) in a third direction (F3). The third direction (F3) intersects with the plane determined by both the first direction (F1) and the second direction (F2); it further includes an insulating sticker (3), and the insulating sticker (3) can cover the opening.

5. The long battery cell device according to claim 2, characterized in that, In the second direction (F2), the size of the battery cell assembly is greater than or equal to twice the size of the supporting ear (12).

6. The long battery cell device according to any one of claims 1 to 5, characterized in that, It further includes a cover plate (4). The cover plate (4) is covered on the side of the insulating end plate (13) facing away from the battery cell assembly. The insulating end plate (13) is provided with a wire passing hole (131) penetrating through the insulating end plate (13) along the first direction (F1). The battery cell assembly is electrically connected to the cover plate (4) via the wire passing hole (131).

7. The long battery cell device according to any one of claims 1 to 5, characterized in that It further includes a housing (5) and an explosion-proof valve (6). The battery cell assembly and the side plate assembly are disposed in the housing (5); the housing (5) is provided with an explosion-proof port (51), and the explosion-proof valve (6) is covered on the explosion-proof port (51).

8. The long battery cell device according to claim 7, characterized in that, The housing (5) further includes a protective sticker (7). The protective sticker (7) is attached to the explosion-proof port (51) from the inner side of the housing (5). The protective sticker (7) is provided with a breathable part penetrating through the protective sticker (7).

9. The long battery cell device according to claim 7, characterized in that, The explosion-proof port (51) is provided on the side surface of the housing (5) in the second direction (F2).

10. A battery, characterized in that, Comprising the long battery cell device according to any one of claims 1 to 9.

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