Battery cell connection terminals and battery cells

Abstract

The present invention provides a battery cell connection terminal and battery cell, wherein the battery cell connection terminal includes: a pole connecting section; a first tab connecting section connected to the pole connecting section and to the tab of a bare battery cell, the first tab connecting section being a first straight plate section; and a first tab mating section connected to the first tab connecting section and abutting the tab of the bare battery cell, the first tab mating section being a first curved plate section. The technical solution of the present invention can effectively solve the problem of battery cell tabs being easily damaged in related technologies.

Description

Technical Field

[0001] The present invention relates to the field of power batteries, and in particular to a connecting terminal of a battery cell and a battery cell. Background Art

[0002] Currently, electric vehicle battery cells are generally assembled using a T-structure, with two connecting terminals extending from the cell's top cover and electrically connected to the cell's tabs. This connection method offers the benefits of low internal resistance and low temperature rise during high-rate charge and discharge. However, this comes with a challenge: the cell relies solely on the tabs to secure it to the terminals. This can easily deform when the entire battery module is subjected to vibration or impact, increasing the cell's movement. Increased movement along the cell's length can easily lead to misalignment between the positive and negative electrode tabs. Widthwise movement can easily cause the tabs to crack or break, reducing the cell's current handling capacity or even causing failure. Furthermore, during assembly and tab shaping, the tabs can move erratically, which can damage the tabs from the inner ends of the connecting terminals, increasing the cell's defective rate. Summary of the Invention

[0003] The main purpose of the present invention is to provide a connecting terminal of a battery cell and a battery cell, so as to solve the problem in the related art that the tabs of the battery cell are easily damaged.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a connecting terminal of a battery cell is provided, which includes: a pole connecting section; a first pole tab connecting section, which is connected to the pole connecting section and connected to the pole tab of the bare battery cell, and the first pole tab connecting section is a first straight plate section; a first pole tab mating section, which is connected to the first pole tab connecting section and abuts against the pole tab of the bare battery cell, and the first pole tab mating section is a first arc-shaped plate section.

[0005] Furthermore, the bare cell includes a first bare cell and a second bare cell, the first tab connecting section is connected to the tab of the first bare cell, and the first tab mating section is in abutment with the tab of the first bare cell, and the connecting terminal also includes: a second tab connecting section, connected to the pole connecting section and connected to the tab of the second bare cell, the second tab connecting section is a second straight plate section; a second tab mating section, connected to the second tab connecting section and in abutment with the tab of the second bare cell, the second tab mating section is a second arc-shaped plate section.

[0006] Furthermore, the central angle corresponding to the first arc-shaped plate segment is greater than or equal to 90°; the central angle corresponding to the second arc-shaped plate segment is greater than or equal to 90°.

[0007] Furthermore, the pole connecting section is a bent plate, and the pole connecting section includes a first connecting plate electrically connected to the pole and a second connecting plate arranged at an angle to the first connecting plate. The first pole tab connecting section is arranged on one side of the second connecting plate and has an angle with the second connecting plate, and the second pole tab connecting section is arranged on the other side of the second connecting plate.

[0008] According to another aspect of the present invention, a battery cell is provided, comprising: a shell having a accommodating cavity and an opening connected to the accommodating cavity; a top cover, which is arranged on the opening of the shell, and a plurality of poles are provided on the top cover; a plurality of connecting terminals, which are arranged in the accommodating cavity and correspond one to one to the plurality of poles, the connecting terminal is the above-mentioned connecting terminal, and the first pole tab matching section of the connecting terminal is located at the inner end of the first pole tab connecting section; a first bare battery cell, which is arranged in the accommodating cavity; wherein the pole connecting section of the connecting terminal is connected to the pole, the first pole tab connecting section is connected to the pole of the first bare battery cell, and the first pole tab matching section is in contact with the pole of the first bare battery cell.

[0009] According to another aspect of the present invention, a battery cell is provided, comprising: a shell having a accommodating cavity and an opening connected to the accommodating cavity; a top cover, which is arranged on the opening of the shell, and a plurality of poles are provided on the top cover; a plurality of connecting terminals, which are arranged in the accommodating cavity and correspond one to one to the plurality of poles, and the connecting terminal is the above-mentioned connecting terminal, and the first pole lug matching section of the connecting terminal is located at the inner end of the first pole lug connecting section, and the second pole lug matching section of the connecting terminal is located at the inner end of the second pole lug connecting section; a first bare battery cell and a second bare battery cell, which are arranged in the accommodating cavity and the first bare battery cell and the second bare battery cell are arranged opposite to each other; wherein, the pole connecting section of the connecting terminal is connected to the pole, the first pole lug connecting section is connected to the pole lug of the first bare battery cell, the first pole lug matching section is in contact with the pole lug of the first bare battery cell, the second pole lug connecting section is connected to the pole lug of the second bare battery cell, and the second pole lug matching section is in contact with the pole lug of the second bare battery cell.

[0010] Furthermore, the battery cell also includes: an insulating sleeve, which is arranged in the accommodating cavity, the insulating sleeve includes a bottom shell arranged below the first bare battery cell and the second bare battery cell and a side shell surrounding the first bare battery cell, the second bare battery cell and the circumferential outside of the connecting terminal, the side shell is arranged to pass through from top to bottom, the bottom shell includes a bottom plate and a surrounding plate connected to the bottom plate, which is nested in the side shell, the bottom plate is an arc-shaped plate with a downward convex arrangement, and the cross-section of the arc-shaped plate is a structure with a low middle and high two sides.

[0011] Furthermore, the connecting terminal also includes a support plate, which is arranged between the first pole lug connecting section and the second pole lug connecting section. The support plate is located at one end of the first pole lug connecting section and the second pole lug connecting section away from the pole column connecting section. The enclosure includes a first end plate and a second end plate. A first clip is provided on the inner wall of the first end plate, and a second clip is provided on the inner wall of the second end plate. The lower surfaces of the first clip and the second clip abut against the upper surface of the support plate.

[0012] Furthermore, the enclosure includes a first end plate, a second end plate, a first side plate and a second side plate, the first side plate and the second side plate are both located between the first end plate and the second end plate, the first side plate is provided with a first notch opening upward, the ratio of the length of the first notch to the length of the first side plate is between 0.5 and 0.95, the second side plate is provided with a second notch opening upward, the ratio of the length of the second notch to the length of the second side plate is between 0.6 and 0.95.

[0013] Furthermore, the enclosure includes a first end plate and a second end plate, and the outer surfaces of the first end plate and the second end plate are both provided with a protruding structure protruding outward, and the outer end surface of the protruding structure includes a facade and a guide slope located below the facade, and the guide slope gradually tilts inward from top to bottom.

[0014] Applying the technical solution of the present invention, the connection terminal of the present application includes a pole connecting section, a first tab connecting section arranged on the pole connecting section, and a first tab fitting section arranged on the first tab connecting section. Among them, the pole connecting section is used to connect to the pole, and the first tab connecting section can be welded to the tab of the bare battery cell, so that the current can flow from the tab to the first tab connecting section, and finally flow to the pole through the pole connecting section. The first tab fitting section is a first arc-shaped plate section that abuts against the tab. After the tab is welded to the first tab connecting section, the tab can be shaped so that the tab fits the first arc-shaped plate section. The contact area between the first arc-shaped plate section and the tab is large and the contact surface is smooth. When the battery module vibrates or is impacted, the first arc-shaped plate section will not damage the tab, thereby improving the service life of the battery cell. In addition, the first arc-shaped plate section can support the tab in the width direction of the battery cell, reducing the probability of the tab moving in the width direction of the battery cell, thereby reducing the probability of the tab cracking. At the same time, the first pole tab connecting section is the first straight plate section, and the first pole tab matching section is the first arc-shaped plate section connected to the first straight plate section. This connection method of the straight plate and the arc-shaped plate can enhance the structural strength of the first pole tab connecting section and the first pole tab matching section, reduce the probability of deformation of the connecting terminal, and further reduce the probability of movement of the bare battery cell, thereby improving the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 A schematic diagram of a three-dimensional structure at one angle is shown according to an embodiment of a connecting terminal of a battery cell of the present invention;

[0017] Figure 2 Shown Figure 1A schematic diagram of the three-dimensional structure of the connecting terminal from another angle;

[0018] Figure 3 A schematic diagram of the split structure of an embodiment of a battery cell according to the present invention is shown;

[0019] Figure 4 Shown Figure 3 Schematic diagram of the cross-sectional structure of the battery cell

[0020] Figure 5 Shown Figure 4 Schematic diagram of the enlarged structure of the battery cell at A;

[0021] Figure 6 Shown Figure 3 A schematic diagram of a three-dimensional structure of a partial structure of a battery cell;

[0022] Figure 7 Shown Figure 3 A schematic diagram of the three-dimensional structure of an embodiment of a bottom shell of a battery cell;

[0023] Figure 8 Shown Figure 3 A schematic diagram of the three-dimensional structure of another embodiment of the bottom shell of the battery cell;

[0024] Figure 9 Shown Figure 7 Schematic diagram of the enlarged structure at B of the bottom shell of the battery cell.

[0025] The above drawings include the following reference numerals:

[0026] 10. Connecting terminal; 11. Pole connecting section; 111. First connecting plate; 112. Second connecting plate; 12. First tab connecting section; 13. First tab fitting section; 14. Second tab connecting section; 15. Second tab fitting section; 16. Support plate; 20. Shell; 21. Opening; 30. Top cover; 40. Pole; 50. First bare cell; 60. Second bare cell; 70. Insulating sleeve; 71. Bottom shell; 712. Enclosure; 711. Bottom plate; 712. Enclosure; 7121. First end plate; 7122. Second end plate; 7123. First side plate; 7124. Second side plate; 72. Side shell; 73. First buckle; 74. Second buckle; 75. Raised structure; 76. First notch; 77. Second notch. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0030] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the connection terminal of the battery cell of the present application includes: a pole connecting section 11, a first tab connecting section 12, and a first tab mating section 13. The first tab connecting section 12 is connected to the pole connecting section 11 and is connected to the tab of the bare battery cell. The first tab connecting section 12 is a first straight plate section; the first tab mating section 13 is connected to the first tab connecting section 12 and abuts against the tab of the bare battery cell. The first tab mating section 13 is a first curved plate section.

[0031] Applying the technical solution of this embodiment, the connection terminal of the present application includes a pole connecting section 11, a first tab connecting section 12 provided on the pole connecting section 11, and a first tab fitting section 13 provided on the first tab connecting section 12. Among them, the pole connecting section 11 is used to connect to the pole, and the first tab connecting section 12 can be welded to the tab of the bare battery cell, so that the current can flow from the tab to the first tab connecting section 12, and finally flow to the pole through the pole connecting section 11. The first tab fitting section 13 is a first arc-shaped plate section that abuts against the tab. After the tab is welded to the first tab connecting section 12, the tab can be shaped so that the tab fits the first arc-shaped plate section. The contact area between the first arc-shaped plate section and the tab is large and the contact surface is smooth. When the battery module vibrates or is impacted, the first arc-shaped plate section will not cause damage to the tab, thereby improving the service life of the battery cell. In addition, the first curved plate segment can support the tab across the width of the cell, reducing the likelihood of the tab shifting across the width of the cell, thereby reducing the likelihood of the tab cracking. Furthermore, the first tab connection segment 12 is a first straight plate segment, and the first tab mating segment 13 is a first curved plate segment connected to the first straight plate segment. This straight plate-to-curved plate connection enhances the structural strength of the first tab connection segment 12 and the first tab mating segment 13, reducing the likelihood of deformation of the connection terminal and further reducing the likelihood of movement of the bare cell, thereby increasing the cell's service life.

[0032] It should be noted that the pole connecting segment 11 and the first tab connecting segment 12 can be an integrally formed structure, or they can be connected by welding or other connection methods, as long as the conductivity between the pole connecting segment 11 and the first tab connecting segment 12 is ensured. The first tab connecting segment 12 and the first tab mating segment 13 can be an integrally formed structure, or they can be connected by welding or other connection methods, as long as the conductivity between the first tab connecting segment 12 and the first tab mating segment 13 is ensured.

[0033] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown, in this embodiment, the bare cell includes a first bare cell and a second bare cell, the first tab connecting section 12 is connected to the tab of the first bare cell, the first tab fitting section 13 is in contact with the tab of the first bare cell, and the connecting terminal further includes: a second tab connecting section 14 and a second tab fitting section 15. Among them, the second tab connecting section 14 is connected to the pole connecting section 11 and is connected to the tab of the second bare cell, and the second tab connecting section 14 is a second straight plate section; the second tab fitting section 15 is connected to the second tab connecting section 14 and is in contact with the tab of the second bare cell, and the second tab fitting section 15 is a second arc-shaped plate section. Specifically, in this embodiment, the cell includes a first bare cell and a second bare cell, the first tab connecting section 12 is used to connect to the tab of the first bare cell, and the first tab fitting section 13 can be in contact with and fit with the tab of the first bare cell to support and shape the tab of the first bare cell. The second tab connection section 14 is used to connect to the tab of the second bare cell, and the second tab mating section 15 can support and shape the tab of the second bare cell. The above structure enables the connection terminal to support, limit, and shape the connection of the two bare cells when the battery cell includes two bare cells, thereby improving the service life of the battery cells.

[0034] It should be noted that when there is only one bare cell in the battery cell, the connection terminal may only include the pole connection section 11, the first tab connection section 12 and the first tab matching section 13. The first tab connection section 12 is welded to the tab, and the first tab matching section 13 is in contact with the tab, forming support for the tab while facilitating the shaping of the tab. Of course, when there is only one bare cell in the battery cell, the connection terminal may also include all the pole connection sections 11, the first tab connection section 12, the first tab matching section 13, the second tab connection section 14 and the second tab matching section 15. At this time, although the connection terminal can connect two bare cells, the second tab connection section 14 and the second tab matching section 15 can also be left vacant, relying only on the first tab connection section 12 and the first tab matching section 13 to connect and match with the bare cell.

[0035] It should also be noted that when more than three bare cells are arranged in the battery core, the number of tab fitting sections and tab connection sections can be increased to accommodate more bare cells.

[0036] like Figure 1 、 Figure 2 and Figure 5As shown, in this embodiment, the central angle corresponding to the first curved plate segment is equal to 90°; the central angle corresponding to the second curved plate segment is also equal to 90°. In the above structure, setting the central angle corresponding to the first curved plate segment to 90° can increase the contact area between the first curved plate segment and the tab of the first bare battery cell, preventing the first curved plate segment from damaging the tab when the battery module vibrates or is impacted. Correspondingly, setting the central angle corresponding to the second curved plate segment to 90° can also achieve the same effect.

[0037] Of course, in other embodiments not shown in the figures, the central angle corresponding to the first arc-shaped plate segment may also be greater than 90°. Correspondingly, the central angle corresponding to the second arc-shaped plate segment may also be greater than 90°.

[0038] Specifically, if Figure 1 and Figure 2 As shown, in this embodiment, the pole connecting section 11 is a bent plate. The pole connecting section 11 includes a first connecting plate 111 electrically connected to the pole and a second connecting plate 112 arranged at an angle to the first connecting plate 111. The first tab connecting section 12 is arranged on one side of the second connecting plate 112 and forms an angle therewith. The second tab connecting section 14 is arranged on the other side of the second connecting plate 112. In this structure, the pole connecting section 11, the first tab connecting section 12, and the second tab connecting section 14 are integrally formed. The angle between the first connecting plate 111 and the second connecting plate 112 is 90°. The first tab connecting section 12 is arranged on the sidewall of the second connecting plate 112 and forms a 90° angle therewith. Correspondingly, the second tab connecting section 14 is arranged on the other sidewall of the second connecting plate 112, with the first tab connecting section 12 and the second tab connecting section 14 being arranged opposite each other. This structure facilitates the processing and forming of the connecting terminal.

[0039] It should be noted that the thickness of each portion of the connecting terminal 10 in this embodiment can be uniform, or thickness can be increased in locations subject to greater stress. For example, the end where the first tab connecting segment 12 connects to the post connecting segment 11 can be thickened to enhance the strength of the connecting terminal and further reduce the probability of deformation. Similarly, the end where the second tab connecting segment 14 connects to the post connecting segment 11 can be thickened.

[0040] The present application also provides a battery cell. The battery cell of the first embodiment includes: a shell 20, a top cover 30, a plurality of connection terminals 10, and a first bare battery cell 50. The shell 20 has a receiving cavity and an opening 21 connected to the receiving cavity; the top cover 30 is provided on the opening 21 of the shell 20, and a plurality of poles 40 are provided on the top cover 30; the plurality of connection terminals 10 are provided in the receiving cavity and are provided in a one-to-one correspondence with the plurality of poles 40, the connection terminal 10 is the above-mentioned connection terminal, and the first tab fitting section 13 of the connection terminal 10 is located at the inner end of the first tab connecting section 12; the first bare battery cell 50 is provided in the receiving cavity; the pole connecting section 11 of the connection terminal 10 is connected to the pole 40, the first tab connecting section 12 of the connection terminal 10 is connected to the tab of the first bare battery cell 50, and the first tab fitting section 13 is in contact with the tab of the first bare battery cell 50.

[0041] In the above structure, the battery cell includes only one bare battery cell, namely the first bare battery cell 50. The connecting terminal 10 includes: a first tab connecting section 12 and a first tab fitting section 13. Among them, the first tab fitting section 13 is a first arc-shaped plate section that abuts against the tab. After the tab is welded to the first tab connecting section 12, the tab can be shaped so that the tab fits with the first arc-shaped plate section. The contact area between the first arc-shaped plate section and the tab is large and the contact surface is smooth. When the battery module vibrates or is impacted, the first arc-shaped plate section will not damage the tab, thereby improving the service life of the battery cell. In addition, the first arc-shaped plate section can support the tab in the width direction of the battery cell, reducing the probability of the tab moving in the width direction of the battery cell, thereby reducing the probability of the tab cracking. At the same time, the first pole tab connecting section 12 is a first straight plate section, and the first pole tab matching section 13 is a first arc-shaped plate section connected to the first straight plate section. This connection method of the straight plate and the arc-shaped plate can enhance the structural strength of the first pole tab connecting section 12 and the first pole tab matching section 13, reduce the probability of deformation of the connecting terminal, and further reduce the probability of movement of the bare battery cell, thereby improving the service life of the battery cell.

[0042] like Figures 3 to 6As described, the difference between the battery cell of Example 2 and the battery cell of Example 1 is that the number of bare cells in the battery cell of Example 2 is different from that in Example 1, and the structure of the connecting terminal is also different from that of the connecting terminal of Example 1. Specifically, the connecting terminal 10 of Example 2 includes a pole connecting section 11, a first tab connecting section 12, a first tab fitting section 13, a second tab connecting section 14, and a second tab fitting section 15. The battery cell also includes a first bare cell and a second bare cell. The first tab connecting section 12 is used to connect to the tab of the first bare cell, and the first tab fitting section 13 can abut and fit with the tab of the first bare cell to support and shape the tab of the first bare cell. The second tab connecting section 14 is used to connect to the tab of the second bare cell, and the second tab fitting section 15 can support and shape the tab of the second bare cell. The above structure enables the connecting terminal to support, limit, and shape the connection of the two bare cells when the battery cell includes two bare cells, thereby improving the service life of the battery cell.

[0043] At present, an insulating sleeve is required inside the battery cell to wrap the bare battery cell to avoid electrical connection between the bare battery cell and the metal shell of the battery cell. However, the inventors found in long-term research that the bottom of the traditional insulating sleeve is easy to scrape against the metal shell when it is installed in the shell of the battery cell, causing damage to the insulating sleeve and causing electrical connection between the bare battery cell and the metal shell. On the other hand, the bottom of the traditional insulating sleeve is a rectangular corner design, and there is a large gap between it and the tab of the bare battery cell, which makes the bare battery cell easy to move. In order to solve the above problems, as Figure 3 and Figure 7As shown, in this embodiment, the battery cell also includes an insulating sleeve 70, which is arranged in the accommodating cavity. The insulating sleeve 70 includes a bottom shell 71 arranged below the first bare battery cell 50 and the second bare battery cell 60 and a side shell 72 surrounding the first bare battery cell 50, the second bare battery cell 60 and the connecting terminal 10 in a circumferential direction. The side shell 72 is arranged to pass through from top to bottom. The bottom shell 71 includes a bottom plate 711 and a surrounding plate 712 connected to the bottom plate 711. The surrounding plate 712 is nested in the side shell 72. The bottom plate 711 is an arc-shaped plate convexly arranged downward, and the cross-section of the arc-shaped plate is a structure with a low middle and high two sides. In the above structure, the side shell 72 can wrap the circumferential outer sides of the first bare cell 50 and the second bare cell 60, and the bottom shell 71 can wrap the bottoms of the first bare cell 50 and the second bare cell 60. The enclosure 712 of the bottom shell 71 and the side shell 72 are nested together to tightly wrap the first bare cell 50 and the second bare cell 60, preventing the tabs of the first bare cell 50 and the tabs of the second bare cell 60 from contacting the metal shell 20. In addition, the bottom plate 711 is a curved plate with a downward convex configuration, and the cross-section of the curved plate is a structure with a low middle and high sides. The above structure allows the insulating sleeve 70 to play a guiding role when it is installed in the shell 20, greatly reducing the probability of the insulating sleeve 70 being scratched. At the same time, the lower ends of the tabs of the first bare cell 50 and the tabs of the second bare cell 60 are also arc-shaped structures that are convex downward, and the curvature of the bottom plate 711 is adapted to the curvature of the lower ends of the tabs, further limiting the movement space of the tabs of the first bare cell 50 and the tabs of the second bare cell 60, thereby extending the service life of the battery.

[0044] It should be noted that the thickness of the insulating sleeve 70 is between 0.1 mm and 2.0 mm. More preferably, the thickness of the insulating sleeve 70 is between 0.3 mm and 0.8 mm.

[0045] It should also be noted that the bottom plate 711 is provided with a plurality of through holes for circulating the electrolyte.

[0046] like Figure 1 、 Figure 3 and Figure 7 As shown, in this embodiment, the bottom shell 71 is snap-fitted to the connection terminals 10, and the side shell 72 is disposed around the circumferential outer side of the bottom shell 71. In the above structure, the snap-fitting of the bottom shell 71 to the connection terminals 10 can improve the connection stability of the bottom shell 71, thereby enabling the bottom shell 71 to wrap around the bottom of the first bare cell 50 and the second bare cell 60.

[0047] like Figure 1 、 Figure 2 and Figure 7As shown, in this embodiment, the connection terminal 10 further includes a support plate 16, which is disposed between the first tab connection segment 12 and the second tab connection segment 14. The support plate 16 is located at the end of the first tab connection segment 12 and the second tab connection segment 14 that is away from the pole connection segment 11. The enclosure 712 includes a first end plate 7121 and a second end plate 7122. A first clip 73 is provided on the inner wall of the first end plate 7121, and a second clip 74 is provided on the inner wall of the second end plate 7122. The lower surfaces of the first clip 73 and the second clip 74 abut against the upper surface of the support plate 16. In the above structure, the support plate 16 can support the first tab connection segment 12 and the second tab connection segment 14, preventing the ends of the first tab connection segment 12 and the second tab connection segment 14 that are away from the pole connection segment 11 from approaching each other and deforming. In addition, the enclosure 712 of the bottom shell 71 includes a first end plate 7121 and a second end plate 7122. The first end plate 7121 is provided with a first clip 73, and the second end plate 7122 is provided with a second clip 74. The first clip 73 and the second clip 74 can be respectively connected to the support plates 16 on the two connecting terminals, so that the bottom shell 71 can be installed on the connecting terminals, thereby improving the stability of the connection of the bottom shell 71.

[0048] like Figure 7 As shown, in this embodiment, the enclosure 712 includes a first end plate 7121, a second end plate 7122, a first side plate 7123 and a second side plate 7124. The first side plate 7123 and the second side plate 7124 are both located between the first end plate 7121 and the second end plate 7122. The first side plate 7123 is provided with a first notch 76 that opens upward, and the ratio of the length of the first notch 76 to the length of the first side plate 7123 is between 0.5 and 0.95. The second side plate 7124 is provided with a second notch 77 that opens upward, and the ratio of the length of the second notch 77 to the length of the second side plate 7124 is between 0.6 and 0.95. In the above structure, since the battery cells may expand during use, a first notch 76 is provided on the first side plate 7123. The ratio of the length of the first notch 76 to the length of the first side plate 7123 is ensured to be between 0.5 and 0.95, so that the first side plate 7123 does not occupy too much space in the width direction of the battery cells. This arrangement can provide more expansion space for the first bare battery cells inside the battery cells. Correspondingly, providing a second notch 77 on the second side plate 7124 can also achieve the same effect.

[0049] like Figure 7As shown, in this embodiment, the enclosure 712 includes a first end plate 7121 and a second end plate 7122. The outer surface of the first end plate 7121 and the outer surface of the second end plate 7122 are both provided with a protruding structure 75 protruding outward. The outer end surface of the protruding structure 75 includes a vertical surface and a guiding slope located below the vertical surface. The guiding slope gradually tilts inward from top to bottom. In the above structure, the protruding structure 75 can fill the gap between the first end plate 7121 and the second end plate 7122 and the shell 20, thereby reducing the probability of the first bare cell 50 and the second bare cell 60 moving in the length direction of the cell, thereby improving the service life of the cell. In addition, the outer end surface of the protruding structure 75 includes a vertical surface and a guiding slope located below the vertical surface. The guiding slope can play a guiding role when the insulating sleeve 70 is installed in the shell 20, thereby improving the assembly efficiency of the cell.

[0050] It should be noted that, in the embodiment, the protruding structure 75 is a boss structure protruding outward.

[0051] Of course, if Figure 8 As shown, in other embodiments, the protruding structure 75 can also be provided on the first side plate 7123 and the second side plate 7124 of the bottom shell 71, but considering that providing the protruding structure 75 on the first side plate 7123 and the second side plate 7124 will occupy a certain space in the width direction of the battery cell, thereby reducing the expansion space of the first bare battery cell 50 and the second bare battery cell 60, it is the optimal embodiment to provide the protruding structure 75 only on the first end plate 7121 and the second end plate 7122.

[0052] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A battery cell comprising: a housing having a receiving cavity and an opening communicating with the receiving cavity; A top cover is provided on the opening of the shell, and a plurality of poles are provided on the top cover; A first bare battery cell and a second bare battery cell are disposed in the accommodating cavity, and the first bare battery cell and the second bare battery cell are disposed opposite to each other; A plurality of connecting terminals are arranged in the accommodating cavity and are arranged in one-to-one correspondence with the plurality of poles, the connecting terminals including a pole connecting section, a first pole lug connecting section, a first pole lug matching section, a second pole lug connecting section and a second pole lug matching section, the first pole lug connecting section is connected to the pole connecting section and is connected to the pole lug of the first bare battery cell, the first pole lug matching section is connected to the first pole lug connecting section and abuts against the pole lug of the first bare battery cell, the first pole lug matching section is a first arc-shaped plate section, the second pole lug matching section is connected to the second pole lug connecting section and abuts against the pole lug of the second bare battery cell, the second pole lug connecting section is connected to the pole connecting section and is connected to the pole lug of the second bare battery cell, and the second pole lug matching section is a second arc-shaped plate section; An insulating sleeve is arranged in the accommodating cavity, the insulating sleeve comprising a bottom shell arranged below the first bare cell and the second bare cell and a side shell arranged around the first bare cell, the second bare cell and the circumferential outside of the connecting terminal, the side shell being arranged through-through from top to bottom, the bottom shell comprising a bottom plate and a surrounding plate connected to the bottom plate, the surrounding plate being nested in the side shell, the bottom plate being a downwardly convex arc-shaped plate, the cross section of the arc-shaped plate being a structure with a low middle and high sides, and a plurality of through holes for circulating the electrolyte being provided on the bottom plate; The connecting terminal also includes a support plate, which is arranged between the first pole tab connecting section and the second pole tab connecting section. The support plate is located at one end of the first pole tab connecting section and the second pole tab connecting section away from the pole column connecting section. The enclosure includes a first end plate and a second end plate. A first clip is provided on the inner wall of the first end plate, and a second clip is provided on the inner wall of the second end plate. The lower surfaces of the first clip and the second clip abut against the upper surface of the support plate.

2. The battery cell according to claim 1, characterized in that The first tab connecting section is a first straight plate section, and the first arcuate plate section and the bent section of the tab of the first bare battery cell are all fitted together. The first arcuate plate section can support the tab of the first bare battery cell in the width direction of the battery cell. The second tab connecting section is a second straight plate section, and the second arcuate plate section and the bent section of the tab of the second bare battery cell are all fitted together. The second arcuate plate section can support the tab of the second bare battery cell in the width direction of the battery cell.

3. The battery cell according to claim 1, characterized in that The central angle of the circle corresponding to the first arc-shaped plate segment is greater than or equal to 90°; the central angle of the circle corresponding to the second arc-shaped plate segment is greater than or equal to 90°.

4. The connecting terminal of the battery cell according to claim 1, characterized in that: The pole connecting section of the connecting terminal is connected to the pole, and the pole connecting section is a bent plate. The pole connecting section includes a first connecting plate electrically connected to the pole and a second connecting plate arranged at an angle to the first connecting plate. The first tab connecting section is arranged on one side of the second connecting plate and has an angle between the first tab connecting section and the second connecting plate, and the second tab connecting section is arranged on the other side of the second connecting plate.

5. The battery cell according to claim 1, characterized in that The first tab fitting section of the connecting terminal is located at an inner end portion of the first tab connecting section, and the second tab fitting section of the connecting terminal is located at an inner end portion of the second tab connecting section.

6. The battery cell according to claim 1, characterized in that The enclosure includes a first end plate, a second end plate, a first side plate and a second side plate, the first side plate and the second side plate are both located between the first end plate and the second end plate, the first side plate is provided with a first notch opening upward, the ratio of the length of the first notch to the length of the first side plate is between 0.5 and 0.95, the second side plate is provided with a second notch opening upward, the ratio of the length of the second notch to the length of the second side plate is between 0.6 and 0.

95.

7. The battery cell according to claim 1, characterized in that The enclosure includes a first end plate and a second end plate, and the outer surfaces of the first end plate and the second end plate are both provided with a protruding structure protruding outward, and the outer end surface of the protruding structure includes a facade and a guide slope located below the facade, and the guide slope gradually tilts inward from top to bottom.

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