Battery cell, battery module, and vehicle

Abstract

A battery cell (100), a battery module, and a vehicle are provided. The battery cell (100) includes a housing (1) and an electrode core (3). In a first direction, cover plates (2) are disposed on two opposite side portions of the housing (1), and poles (21) are disposed on each cover plate (2). The electrode core (3) is disposed within the housing, and the electrode core (3) includes a positive electrode plate (31), a negative electrode plate (32), and a diaphragm (33). The diaphragm (33) is disposed between the positive electrode plate (31) and the negative electrode plate (32). The positive electrode plate (31) is electrically connected to one of the poles (21) via a positive electrode tab, and the negative electrode plate (32) is electrically connected to the other of the poles (21) via a negative electrode tab (321). Support portions (5) that abut against the diaphragm (33) are disposed inside the two cover plates (2). In the first direction, the length of the diaphragm (33) is L_diaphragm, the minimum distance between the support portions (5) on both sides of the electrode core (3) is L_spacing, and the battery cell satisfies the following condition: L_diaphragm - 6 mm < L_spacing ≤ L_diaphragm.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 2023204400370, entitled "BATTERY CELL, BATTERY MODULE, AND VEHICLE," filed on February 28, 2023, which is incorporated herein by reference in its entirety.

[0002] The present application relates to the field of battery technology, and in particular to battery cells, battery modules, and vehicles. [Background technology]

[0003] Among all forms of energy, electrical energy is the easiest to use, the cleanest, most environmentally friendly, and most efficient. Batteries are the best device for storing electrical energy and are widely used in people's daily lives, having a significant impact on people's lives. With the gradual development of battery technology, batteries with excellent performance are becoming increasingly popular. In related technologies, the polar core of a battery is mounted within a housing, but the housing has a poor confining effect on the polar core, especially on the diaphragm within the polar core. This makes the polar core prone to movement and deformation within the housing, which reduces the overall quality of the battery and leaves room for improvement. Summary of the Invention

[0004] The present application is intended to solve at least one of the technical problems in the prior art. Therefore, an object of the present application is to provide a battery cell that restricts the diaphragm of an electrode core to prevent relative movement between the diaphragm and the positive or negative electrode plate, thereby improving the reliability of the electrode core.

[0005] The present application further provides a battery module in which the aforementioned battery cells are used.

[0006] The present application further provides a vehicle in which the aforementioned battery module is used.

[0007] A battery cell according to an embodiment of the present application includes a housing and an electrode core. In a first direction, cover plates are disposed on two opposite sides of the housing, and electrodes are disposed on each of the cover plates. The electrode core is disposed within the housing and includes a positive electrode plate, a negative electrode plate, and a diaphragm. The diaphragm is disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate is electrically connected to one of the electrodes via a positive electrode tab, and the negative electrode plate is electrically connected to the other of the electrodes via a negative electrode tab. Support portions that abut against the diaphragm are disposed inside the two cover plates. In the first direction, the length of the diaphragm is L_diaphragm, the minimum distance between the support portions on both sides of the electrode core is L_interval, and the battery cell satisfies the following condition: L_diaphragm - 6 mm < L_interval ≤ L_diaphragm.

[0008] According to the battery cell of this embodiment of the present application, the minimum distance between the support portions on both sides of the electrode core is restricted to be within a certain range. As a result, the support portions on both sides restrict the diaphragm of the electrode core, and relative movement between the diaphragm and the positive electrode plate or the negative electrode plate can be avoided. This reduces the possibility of deformation of the electrode core, improves the overall stability of the electrode core, and improves the reliability of the battery cell.

[0009] A battery module according to the present application includes a box and a plurality of battery cells. The battery cells are battery cells according to any one of the aforementioned embodiments, and the plurality of battery cells are disposed within the box.

[0010] A vehicle according to the present application includes the aforementioned battery module.

[0011] Further aspects and advantages of the present application are provided in part in the following description, and some of the further aspects and advantages will become apparent from the following description or will be learned from the practice of the present application.

Brief Description of the Drawings

[0012] [Figure 1] 1 is a schematic structural diagram of a battery cell according to an embodiment of the present application; [Figure 2] 1 is a cross-sectional view of an electrode core attachment according to an embodiment of the present application. [Figure 3] 1 is a schematic diagram of a spacer ring according to an embodiment of the present application. [Figure 4] FIG. 10 is a schematic diagram of a cover plate according to another embodiment of the present application. [Figure 5] 1 is a cross-sectional view of a battery cell according to an embodiment of the present application. [Figure 6] 1 is a schematic diagram of an insulating film attachment according to an embodiment of the present application. [Figure 7] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements, or elements having the same or similar functions, throughout. The following embodiments described with reference to the accompanying drawings are examples and are intended to illustrate the present application only, and should not be understood as limitations on the present application.

[0014] The following describes a battery cell 100 according to an embodiment of the present application with reference to the accompanying drawings.

[0015] As shown in FIGS. 1 to 7, the battery cell 100 according to this embodiment of the present application includes a housing 1 and an electrode core 3. In a first direction, cover plates 2 are arranged on two opposite side portions of the housing 1, and poles 21 are arranged on each cover plate 2. The electrode core 3 is arranged inside the housing 1. The electrode core 3 includes a positive electrode plate 31, a negative electrode plate 32, and a diaphragm 33. The diaphragm 33 is arranged between the positive electrode plate 31 and the negative electrode plate 32. The positive electrode plate 31 is electrically connected to one of the poles 21 through a positive electrode tab, and the negative electrode plate 32 is electrically connected to the other of the poles 21 through a negative electrode tab 321. Support portions 5 that abut against the diaphragm 33 are arranged inside the two cover plates 2. In the first direction, the length of the diaphragm 33 is L diaphragm, the minimum distance between the support portions 5 on both sides of the electrode core 3 is L interval, and the battery cell 100 satisfies the following condition: L diaphragm - 6 mm < L interval ≤ L diaphragm.

[0016] Therefore, the support portions 5 on both sides can limit the diaphragm 33 of the electrode core 3 and avoid relative movement between the diaphragm 33 and the positive electrode plate 31 or the negative electrode plate 32. This can reduce the possibility of deformation of the electrode core 3, improve the overall stability of the electrode core 3, and improve the reliability of the battery cell 100.

[0017] For example, as shown in FIGS. 1 to 6, the battery cell 100 includes a housing 1 and an electrode core 3. The housing 1 is constructed as a square tube. Openings are formed at both ends of the housing 1 in a first direction (i.e., the length direction shown in FIG. 1), and two cover plates 2 are arranged. The two cover plates 2 are respectively attached to the two openings of the housing 1 and configured to close the openings. As a result, the housing 1 and the cover plates 2 can define a sealed mounting cavity. Each cover plate 2 is provided with a pole 21. The pole 21 penetrates the cover plate 2 in the thickness direction and extends into the mounting cavity.

[0018] The electrode core 3 may be mounted in the mounting cavity of the housing 1. The electrode core 3 includes a positive electrode plate 31, a negative electrode plate 32, and a diaphragm 33. A plurality of positive electrode plates 31 and a plurality of negative electrode plates 32 are arranged, and the plurality of positive electrode plates 31 and the plurality of negative electrode plates 32 are arranged in a staggered pattern. A plurality of diaphragms 33 are arranged, and the diaphragm 33 is sandwiched between adjacent positive electrode plates 31 and negative electrode plates 32 and configured to separate the positive electrode plate 31 from the negative electrode plate 32. The positive electrode tab is arranged on one side of the positive electrode plate 31 in the first direction, and the positive electrode plate 31 may be electrically connected to the corresponding side of the electrode 21 through the positive electrode tab. The negative electrode tab 321 is arranged on the other side of the negative electrode plate 32 in the first direction, and the negative electrode plate 32 may be electrically connected to the other electrode 21 through the negative electrode tab 321. As a result, the electrode core 3 can supply power to the outside.

[0019] The support portions 5 may be respectively arranged inside the two cover plates 2. Two support portions 5 are arranged, and the two support portions 5 are respectively arranged on both sides of the tab. The support portion 5 abuts against the end of the electrode core 3 to limit the electrode core 3 in the first direction, thereby preventing the electrode core 3 from moving in the first direction. In the first direction, the length of the diaphragm 33 may be set to L diaphragm, and the minimum distance between the support portions 5 on both sides of the electrode core 3 may be set to L interval, and the battery cell 100 satisfies the following condition: L diaphragm - 6 mm < L interval ≤ L diaphragm.

[0020] The length of the diaphragm 33 (L) may be equal to or greater than the minimum distance L between the supports 5 on both sides of the electrode core 3, and may be less than 6 mm plus the minimum distance L between the supports 5 on both sides of the electrode core 3. In this manner, the supports 5 on both sides can restrict the diaphragm 33 in the first direction to improve the mounting stability of the diaphragm 33 and reduce the possibility of the diaphragm 33 moving relative to the positive and negative electrode plates 31 and 32. As a result, the diaphragm 33 stably separates the positive and negative electrode plates 31 and 32, thereby improving the stability of the electrode core 3 and reducing the possibility of deformation of the electrode core 3. This improves the reliability of the battery cell 100.

[0021] According to the battery cell 100 in this embodiment of the present application, the minimum distance between the supports 5 on both sides of the electrode core 3 is limited to a certain range, so that the supports 5 on both sides can restrict the diaphragm 33 of the electrode core 3 and prevent relative movement between the diaphragm 33 and the positive electrode plate 31 or the negative electrode plate 32. This reduces the possibility of deformation of the electrode core 3, improves the overall stability of the electrode core 3, and enhances the reliability of the battery cell 100.

[0022] In some embodiments of the present application, a spacer ring 4 is disposed inside at least one cover plate 2, and the spacer ring 4 is provided with a receiving cavity 41 configured to receive a positive electrode tab or a negative electrode tab 321, and a support portion 5 is disposed on the corresponding spacer ring 4.

[0023] For example, as shown in FIGS. 3 and 7 , the battery cell 100 may be configured to have a spacer ring 4 that is conformally positioned relative to the opening. The spacer ring 4 is configured to be attached between the inside of the cover plate 2 (i.e., the side facing the mounting cavity) and the end of the electrode core 3 in the first direction, so that the spacer ring 4 can insulate the cover plate 2 from the electrode core 3. An accommodation cavity 41 is formed on the spacer ring 4, and the accommodation cavity 41 penetrates the spacer ring 4 in the thickness direction. The accommodation cavity 41 of the spacer ring 4 is configured to accommodate a positive electrode tab (or a negative electrode tab 321), so that the positive electrode tab (or a negative electrode tab 321) can be connected to the electrode 21 on the corresponding side through the spacer ring 4. In addition, a support 5 is arranged on the side of the spacer ring 4 facing the electrode core 3, and the support 5 is configured to limit and support the electrode core 3, so that the cover plate 2 can limit the electrode core 3 by using the spacer ring 4.

[0024] By disposing the support portion 5 on the spacer ring 4, the difficulty of processing the cover plate 2 can be reduced, which can contribute to reducing processing costs.

[0025] In some embodiments of the present application, the support portion 5 and the cover plate 2 are an integral member. For example, as shown in FIG. 4 , the support portion 5 and the cover plate 2 may be integrally formed such that the support portion 5 is disposed inside the cover plate 2, and the insulating portion 22 may be integrated into the inside of the cover plate 2. After the cover plate 2 is attached to the opening of the housing 1, the insulating portion 22 and the support portion 5 may insulate the cover plate 2 from the electrode core 3, and the support portion 5 may be supported on the electrode core 3 to restrict the electrode core 3. Based on the above-described arrangement, the cover plate 2 can be assembled by a single attachment, which contributes to reducing the difficulty of attaching the battery cell 100 and improving the processing efficiency of the battery cell 100.

[0026] In some embodiments of the present application, the length H of the battery cell 100 is 400 mm≦H≦1500 mm, the height W of the battery cell 100 is 80 mm≦W≦240 mm, and the thickness T of the battery cell 100 is 10 mm≦T≦40 mm.

[0027] For example, as shown in FIG. 1 , the value of the length H of the battery cell 100 may be 600 mm. Alternatively, the value of the length H of the battery cell 100 may be 950 mm. Alternatively, the value of the length H of the battery cell 100 may be 1300 mm. Alternatively, the value of the length H of the battery cell 100 may be any value that satisfies the conditions. This is not a limitation in the present application. Therefore, an excessive increase in the length of the battery cell 100 can be avoided, which improves the structural stability of the battery cell 100. In addition, an excessive decrease in the length of the battery cell 100 can be avoided, which contributes to an improvement in the energy density of the battery cell 100 and improves the practicality of the battery cell 100.

[0028] As shown in FIG. 1 , the width W of the battery cell 100 may be 100 mm. Alternatively, the width W of the battery cell 100 may be 160 mm. Alternatively, the width W of the battery cell 100 may be 220 mm. Alternatively, the width W of the battery cell 100 may be any value that satisfies the conditions. This is not a limitation in the present application. Therefore, an excessive increase in the width of the battery cell 100 can be avoided, which improves the structural stability of the battery cell 100. In addition, an excessive decrease in the width of the battery cell 100 can be avoided, which contributes to improving the energy density of the battery cell 100.

[0029] In some embodiments of the present application, as shown in FIG. 1 , the value of the thickness T of the battery cell 100 may be 15 mm. Alternatively, the value of the thickness T of the battery cell 100 may be 25 mm. Alternatively, the value of the thickness T of the battery cell 100 may be 35 mm. Alternatively, the value of the thickness T of the battery cell 100 may be any value that satisfies the conditions. This is not a limitation in the present application. Therefore, an excessive increase in the thickness of the battery cell 100 can be prevented from affecting the heat dissipation performance of the battery cell 100, and an excessive decrease in the thickness of the battery cell 100 can be prevented from affecting the structural stability of the battery cell 100, thereby improving the practicality of the battery cell 100.

[0030] In some embodiments of the present application, the electrode core 3 includes two first surfaces 34 arranged opposite each other, and the area of ​​the first surfaces 34 is larger than the area of ​​the remaining surfaces of the electrode core 3. The battery cell 100 further includes two insulating films 6, which are attached to the two first surfaces 34, respectively. The first direction is the length direction of the first surfaces 34.

[0031] For example, as shown in FIG. 7 , two opposing sides of the electrode core 3 in the thickness direction may be configured as first surfaces 34, and the area of ​​the first surfaces 34 may be larger than the area of ​​the remaining surfaces of the electrode core 3. The battery cell 100 has two insulating films 6, which may be configured as thermally conductive composite films and attached to the two first surfaces 34, respectively, with the first direction set to the length direction of the first surfaces 34, so that the two cover plates 2 can be disposed at both ends of the length direction of the electrode core 3. The edges 61 of the two insulating films 6 in the width direction of the electrode core 3 may be connected via an insulating connecting film 7, so that the insulating film 6 wraps around the electrode core 3 to insulate the electrode core 3 from the housing 1 and prevent leakage of the battery cell 100 caused by an electrical connection between the electrode core 3 and the housing 1.

[0032] The insulating film 6 is attached to the first surface 34, so that the connection area between the insulating film 6 and the electrode core 3 can be increased and the attachment stability of the insulating film 6 can be improved. In addition, the cover plate 2 is disposed at the end of the electrode core 3 in the longitudinal direction, so that the possibility of a short circuit between the two poles 21 can be reduced and the reliability of the battery cell 100 can be improved.

[0033] In some embodiments of the present application, the insulating film 6 is bonded to the housing 1. Based on the above-described arrangement, the electrode core 3 may be attached to the housing 1 via the insulating film 6. This can improve the connection stability between the housing 1 and the electrode core 3, reduce the possibility of the electrode core 3 moving within the housing 1, improve the mounting stability of the battery cell 100, and improve the overall performance of the battery cell 100.

[0034] In some embodiments of the present application, the edges 61 of the two insulating films 6 on the same side in the width direction of the electrode core 3 are overlapped to insulate the electrode core 3 from the housing 1 .

[0035] 6 and 7 , the width of the insulating film 6 may be set larger than the width of the electrode core 3, so that both widthwise sides of the insulating film 6 can extend to two widthwise side surfaces of the electrode core 3, respectively, and the edges 61 of the two insulating films 6 that extend to the same widthwise side surface of the electrode core 3 may be overlapped, so that the two insulating films 6 surround and are fixed to the circumferential outside of the electrode core 3, insulating the electrode core 3 from the housing 1. This contributes to reducing the number of parts of the battery cell 100, reducing processing costs, and improving the insulation performance and reliability of the battery cell 100.

[0036] In some embodiments of the present application, the width of the insulating film 6 may be set to W2, where W2 satisfies W+T≦W2≦W+2T. In other words, the width W2 of the insulating film 6 may be set to be equal to or greater than the sum of the thickness T and the width W of the electrode core 3. When the insulating film 6 is attached to the first surface 34 of the electrode core 3, the edge 61 of the insulating film 6 may extend to the side surface of the electrode core 3 in the width direction, and the size of the edge 61 of the insulating film 6 that extends to the side surface of the electrode core 3 in the width direction is equal to or greater than 1 / 2T. As a result, the edge 61 of two insulating films 6 that extend to the same side in the width direction of the electrode core 3 contact or have overlapping portions, and the edge 61 of the two insulating films 6 can be overlapped. In addition, the width W2 of the insulating film 6 may be set to be equal to or less than the sum of the thickness T of the electrode core 3 and twice the width W of the electrode core 3, so that the size of the edge 61, which is the edge of the insulating film 6 and extends to the side surface of the electrode core 3 in the width direction, is equal to or less than T. This prevents the edge 61 of the insulating film 6 from extending to the other first surface 34, and can contribute to reducing the difficulty of installing the insulating film 6. This contributes to reducing the difficulty of installing the battery cell 100 and improves the practicality of the battery cell 100.

[0037] In some embodiments of the present application, in the width direction of the electrode core 3, the electrode core 3 is provided with second surfaces 35 arranged opposite each other, and adhesive members are provided on the second surfaces 35, and the adhesive members and each insulating film 6 have overlapping areas.

[0038] For example, as shown in FIGS. 6 and 7 , the widthwise side of the electrode core 3 may be set to the second surface 35. The two second surfaces 35 are disposed opposite each other. The edge 61 of the insulating film 6 attached to the first surface 34 may extend to a position directly opposite the second surface 35, and at least a portion of the edges 61 of the two insulating films 6 that extend to the second surface 35 do not overlap. An adhesive member is disposed on the second surface 35, and the adhesive member and each insulating film 6 have an overlapping region. The adhesive member may be separately attached to the edges 61 of the two insulating films 6 to separately fix the edges 61 of the two insulating films 6 to the second surface 35. This contributes to improving the attachment stability of the insulating films 6 and improves the reliability of the battery cell 100.

[0039] The present application further provides a battery module.

[0040] A battery module according to one embodiment of the present application includes a box and a plurality of battery cells 100, the battery cells 100 being the battery cells 100 described in any one of the above-mentioned embodiments, and the plurality of battery cells 100 being arranged in the box.

[0041] For example, a battery module may be arranged to include a box and a plurality of battery cells 100. The box may be constructed as a square structure, and a mounting cavity may be formed within the box. The plurality of battery cells 100 are mounted within the mounting cavity, and the plurality of battery cells 100 may be arranged consecutively or at intervals. The plurality of battery cells 100 are configured to perform charging and discharging synchronously, so that the battery module can operate stably.

[0042] According to the battery module in this embodiment of the present application, the minimum distance between the supports 5 on both sides of the electrode core 3 is limited to a certain range, so that the supports 5 on both sides can restrict the diaphragm 33 of the electrode core 3 and prevent relative movement between the diaphragm 33 and the positive electrode plate 31 or the negative electrode plate 32. This reduces the possibility of deformation of the electrode core 3, improves the overall stability of the electrode core 3, and improves the reliability of the battery cell 100, contributing to improved reliability of the battery module.

[0043] The present application further provides a vehicle.

[0044] A vehicle according to an embodiment of the present application includes a battery module according to any one of the previous embodiments.

[0045] According to the vehicle in this embodiment of the present application, the minimum distance between the supports 5 on both sides of the electrode core 3 is limited to a certain range, so that the supports 5 on both sides can restrict the diaphragm 33 of the electrode core 3 and prevent relative movement between the diaphragm 33 and the positive electrode plate 31 or the negative electrode plate 32. This reduces the possibility of deformation of the electrode core 3, improves the overall stability of the electrode core 3, improves the reliability of the battery cells 100, contributes to improving the reliability of the battery module, and improves the overall performance of the vehicle.

[0046] In the description herein, reference to a description of terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "particular example," or "some examples" means that the particular feature, structure, material, or characteristic described with reference to an embodiment or example is included in at least one embodiment or example of the present application. Exemplary references to such terms in the description herein do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] Although embodiments of the present application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and purpose of the present application, and the scope of the present application is defined by the claims and their equivalents. [Explanation of symbols]

[0048] 100 battery cells 1. Housing 2 cover plates 21 poles 22 Insulation section 3 Electrode Core 31 Positive electrode plate 32 negative electrode plate 321 Negative electrode tab 33 Diaphragm 34 First Surface 35 Second Surface 4 spacer rings 41 Containment Cavity 5 Support part 6. Insulating film 61 Edge 7. Insulating connection film

Claims

1. A battery cell (100), a housing (1) in a first direction, with cover plates (2) arranged on two opposite sides of the housing (1), and with poles (21) arranged on each of the cover plates (2); an electrode core (3); The electrode core (3) is disposed in the housing (1), the electrode core (3) comprises a positive electrode plate (31), a negative electrode plate (32), and a diaphragm (33), the diaphragm (33) is disposed between the positive electrode plate (31) and the negative electrode plate (32), the positive electrode plate (31) is electrically connected to one of the electrodes (21) via a positive electrode tab, and the negative electrode plate (32) is electrically connected to the other of the electrodes (21) via a negative electrode tab (321), A support portion (5) that abuts against the diaphragm (33) is disposed inside the two cover plates (2), In the first direction, the length of the diaphragm (33) is L diaphragm, the minimum distance between the support portions (5) on both sides of the electrode core (3) is L spacing, and the battery cell (100) satisfies the following condition: L diaphragm - 6 mm < L spacing ≦ L diaphragm.

2. 2. The battery cell (100) according to claim 1, wherein a spacer ring (4) is disposed inside at least one of the cover plates (2), a receiving cavity (41) configured to receive the positive electrode tab or the negative electrode tab (321) is disposed on the spacer ring (4), and the support portion (5) is disposed on the corresponding spacer ring (4).

3. 3. The battery cell (100) according to claim 1 or 2, wherein the support (5) and the cover plate (2) are an integral part.

4. 4. The battery cell (100) according to claim 1, wherein the length H of the battery cell (100) is 400 mm≦H≦1500 mm, the height W of the battery cell (100) is 80 mm≦W≦240 mm, and the thickness T of the battery cell (100) is 10 mm≦T≦40 mm.

5. The electrode core (3) has two first surfaces (34) arranged opposite each other, and the area of ​​the first surfaces (34) is larger than the area of ​​the remaining surfaces of the electrode core (3); 5. The battery cell (100) according to claim 1, further comprising two insulating films (6), the two insulating films (6) being attached to the two first surfaces (34), respectively, and the first direction being the length direction of the first surfaces (34).

6. The battery cell (100) according to claim 5, wherein the insulating film (6) is bonded to the housing (1).

7. 7. A battery cell (100) according to claim 5 or 6, wherein the edges (61) of the two insulating films (6) on the same side in the width direction of the electrode core (3) are overlapped to insulate the electrode core (3) from the housing (1).

8. 8. A battery cell (100) according to claim 5, wherein the electrode core (3) has second surfaces (35) arranged opposite each other in the width direction of the electrode core (3), an adhesive member is provided on the second surfaces (35), and the adhesive member and the insulating film (6) each have an overlapping region.

9. The box and A plurality of battery cells (100), A battery module, wherein the battery cell (100) is the battery cell (100) according to any one of claims 1 to 8, and the plurality of battery cells (100) are arranged in the box.

10. A vehicle comprising the battery module according to claim 9.

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