Battery monomer and battery

Abstract

The utility model discloses a battery monomer and a battery, and relates to the technical field of batteries. Each battery monomer comprises a shell, a battery cell group, a cover plate assembly and a connecting sheet; the battery cell group is arranged in the shell, the battery cell group comprises at least one battery cell, and any battery cell is provided with a tab; the shell is provided with an opening structure, the cover plate assembly is arranged on the opening structure, and the cover plate assembly comprises a pole; the connecting piece is arranged on one side, close to the battery cell group, of the cover plate assembly, the connecting piece comprises a first connecting part and at least one second connecting part, the at least one second connecting part is arranged close to the edge of the first connecting part, one end, far away from the first connecting part, of the second connecting part extends towards one side far away from the battery cells, and the tab is connected to the at least one second connecting part. According to the battery monomer provided by the invention, a larger redundant space is provided for the tabs under the condition that the internal space of the shell is not changed.

Description

Technical Field

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

[0002] In the battery structure, the connection between the tab and the terminal is usually achieved through an adapter.

[0003] After the traditional battery structure is assembled, it is easy for the tab to be inserted into the pole piece, causing a short circuit. The main reason for the tab to be inserted into the pole piece is that the movable length of the tab is larger than the movable space of the tab, that is, in the traditional battery structure, there is insufficient redundant space for the tab. Utility Model Content

[0004] The present application provides a battery cell and a battery, which provide a larger redundant space for the tabs while keeping the internal space of the shell unchanged.

[0005] The present application provides a battery cell, including a shell, a battery cell group, a cover plate assembly and a connecting sheet;

[0006] The battery cell group is arranged in the housing, and the battery cell group includes at least one battery cell, and any of the battery cells is provided with a tab;

[0007] The housing is provided with an opening structure, the cover plate assembly is arranged at the opening structure, and the cover plate assembly includes a pole;

[0008] The connecting piece is arranged on a side of the cover plate assembly close to the battery cell group, and the connecting piece includes a first connecting portion and at least one second connecting portion, the at least one second connecting portion is arranged close to the edge of the first connecting portion, and an end of the second connecting portion away from the first connecting portion extends in a direction away from one side of the battery cell, the pole ear is connected to the at least one second connecting portion, and the first connecting portion is connected to the pole.

[0009] Based on the above technical solution, in the battery cell provided in the present application, one end of the second connecting portion is extended in a direction away from one side of the battery cell, thereby forming a larger space on the side of the second connecting portion close to the battery cell group, providing a larger redundant space for the pole ear and reducing the possibility of the pole ear being inserted backwards into the battery cell body.

[0010] In some possible implementations, the battery cell group includes a plurality of the battery cells;

[0011] The connecting piece includes two second connecting parts, and the two second connecting parts are arranged on both sides of the first connecting part;

[0012] Part of the tabs of the battery cells are connected to one of the second connecting portions, and another part of the tabs of the battery cells are connected to another of the second connecting portions.

[0013] In some possible implementations, the battery cell group includes four battery cells arranged side by side;

[0014] Wherein, the tabs of two adjacent battery cells are arranged close together and connected to a second connecting portion;

[0015] The tabs of the other two adjacent battery cells are folded together and connected to another second connecting portion.

[0016] In some possible implementations, the tab is connected to a side of the second connection portion close to the battery cell group.

[0017] In some possible implementations, the pole ear is folded to a side of the second connection portion close to the cover plate assembly, and is connected to a side of the second connection portion close to the cover plate assembly.

[0018] In some possible implementations, a side edge of the second connection portion away from one end of the first connection portion is provided with a rounded corner.

[0019] In some possible implementations, a surface of the second connection portion away from one end of the first connection portion is configured as an arc surface.

[0020] In some possible embodiments, the second connecting portion includes a first structural segment, one end of which extends in a direction away from the battery cell; the first structural segment is formed by bending an edge of the second connecting piece toward a side away from the battery cell and forming a bending angle α, wherein 0°<α<90°.

[0021] In some possible implementations, one end of the first structure segment close to the first connection portion is connected to a transition segment, and a side of the transition segment away from the cover plate assembly is a curved surface.

[0022] In addition, the present application also provides a battery, comprising the battery cell provided in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 shows a schematic cross-sectional structure diagram of a battery cell in some embodiments;

[0025] Figure 2Shows Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0026] Figure 3 A schematic diagram of a partial cross-sectional structure of a connecting sheet in some embodiments is shown;

[0027] Figure 4 Schematic diagrams showing the connection relationship between the tabs and the connecting sheets in other embodiments are shown;

[0028] Figure 5 Shows Figure 4 A schematic diagram of the partially enlarged structure of part B;

[0029] Figure 6 Partial structural schematic diagrams of the second connecting portion in some other embodiments are shown.

[0030] Description of main component symbols:

[0031] 1000-battery cell;

[0032] 100-shell; 110-opening structure; 120-accommodating cavity; 200-battery cell group; 210-battery cell; 211-ear; 211a-first ear; 211b-second ear; 212-battery cell body; 300-cover assembly; 310-pole; 320-first insulating member; 330-second insulating member; 340-sealing member; 350-cover; 400-connecting plate; 410-first connecting portion; 420-second connecting portion; 4201-first structural section; 4202-second structural section; 4203-transition section; 421-fillet; 422-arc surface. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] like Figure 1 and Figure 2 As shown, a battery cell 1000 is provided in an embodiment, including a housing 100 , a battery cell group 200 , a cover plate assembly 300 and a connecting sheet 400 .

[0039] The interior of the housing 100 is a hollow structure, and forms a receiving chamber 120 . An opening structure 110 is disposed at one end of the housing 100 , and the opening structure 110 is communicated with the receiving chamber 120 .

[0040] The battery cell group 200 is disposed in the accommodating cavity 120 of the housing 100. The battery cell group 200 may include at least one battery cell 210, and any battery cell 210 is provided with a tab 211. It is understandable that the battery cell 210 also includes a battery cell body 212 wound with positive / negative electrode sheets and a separator, and the tab 211 may be connected to the battery cell body 212.

[0041] The cap assembly 300 is disposed at the opening structure 110 of the housing 100 and can seal the opening structure 110. The cap assembly 300 includes a pole 310 for realizing external connection of the battery cell 1000.

[0042] The connecting piece 400 is disposed on one side of the cap assembly 300 close to the battery cell group 200. The connecting piece 400 may include a first connecting portion 410 and at least one second connecting portion 420, and the at least one second connecting portion 420 is disposed close to the edge of the first connecting portion 410. The first connecting portion 410 is connected to the pole 310, and the at least one second connecting portion 420 is connected to the pole ear 211 of the battery cell group 200, thereby realizing electrical connection between the battery cell group 200 and the pole 310.

[0043] In addition, the end of the second connection portion 420 away from the first connection portion 410 extends in a direction away from the side of the battery cell 210. Therefore, when the internal space of the shell 100 remains unchanged, the space of the second connection portion 420 close to the battery cell group 200 can be increased, thereby providing a larger redundant space for the pole ear 211, increasing the movable space of the pole ear 211, and reducing the risk of short circuit caused by the pole ear 211 being inserted upside down into the battery cell body 212.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments, the cover plate assembly 300 further includes a cover plate 350 , a first insulating member 320 , a second insulating member 330 , and a sealing member 340 .

[0045] The cover plate 350 covers the opening structure 110 of the housing 100 and can be fixedly connected to the housing 100 in a sealed manner by welding or the like. The pole 310 can be arranged on the cover plate 350 along the axial direction of the battery cell 1000. One end of the pole 310 extends to the side of the cover plate 350 close to the accommodating cavity 120 and can be connected to the first connecting portion 410 by laser welding. The other end of the pole 310 protrudes from the side of the cover plate 350 away from the accommodating cavity 120 for external connection with other devices. The axial direction of the battery cell 1000 can refer to the extension direction of the axis L.

[0046] In the embodiment, the first insulating member 320 is arranged on a side of the cover plate 350 away from the accommodating cavity 120, and is clamped between the end of the pole 310 protruding relative to the cover plate 350 and the cover plate 350, thereby achieving insulation between the end of the pole 310 protruding relative to the cover plate 350 and the cover plate 350.

[0047] The second insulating member 330 is disposed on the side of the cover plate 350 close to the accommodating cavity 120. In addition, the second insulating member 330 is disposed between the connecting piece 400 and the cover plate 350, and extends to the pole 310 for connecting one end of the first connecting portion 410 and the cover plate 350, which can achieve insulation between the pole 310 for connecting one end of the first connecting portion 410 and the cover plate 350, and insulation between the connecting piece 400 and the cover plate 350. The sealing member 340 is sleeved on the circumferential side of the portion of the pole 310 that passes through the cover plate 350, providing a sealing effect while achieving insulation between the pole 310 and the cover plate 350.

[0048] It is understandable that any battery cell 210 includes a positive electrode tab and a negative electrode tab. The cover assembly 300 also includes an insulated positive electrode column and a negative electrode column. Accordingly, the battery cell 1000 also includes a positive electrode connecting piece connected between the positive electrode column and the positive electrode tab, and a negative electrode connecting piece connected between the negative electrode column and the negative electrode tab. In the embodiment, the structure of the positive electrode connecting piece and the connection method of the positive electrode connecting piece with the positive electrode tab and the positive electrode column may be similar to the structure of the negative electrode connecting piece and the connection method of the negative electrode connecting piece with the negative electrode tab and the negative electrode column.

[0049] In this embodiment, the connecting piece 400 used as the positive electrode, the electrode post 310 of the positive electrode and the electrode tab 211 of the positive electrode are taken as examples for detailed description.

[0050] like Figure 1 and Figure 2 As shown, in some embodiments, the battery cell group 200 may include four battery cells 210 arranged side by side. The connecting sheet 400 may include two second connecting portions 420, and the two second connecting portions 420 are respectively arranged on both sides of the first connecting portion 410. In the embodiment, the tabs 211 of two adjacent battery cells 210 are connected to one second connecting portion 420, and the tabs 211 of two adjacent battery cells 210 are connected to another second connecting portion 420.

[0051] In other embodiments, the battery cell group 200 may include a battery cell 210, and the connecting sheet 400 may include a second connecting portion 420, and the tab 211 of the battery cell 210 may be connected to the second connecting portion 420. Alternatively, the battery cell group 200 includes two, three, five, or six battery cells 210, and the connecting sheet 400 may include two second connecting portions 420, wherein the tabs 211 of a portion of the battery cells 210 may be connected to one second connecting portion 420, and the tabs 211 of another portion of the battery cells 210 may be connected to another second connecting portion 420.

[0052] like Figure 1 and Figure 2 As shown, in the embodiment, a group of two adjacent battery cells 210 is taken as an example for description.

[0053] One of the cells 210 includes a first pole tab 211a, and the other cell 210 includes a second pole tab 211b. The first pole tab 211a can be attached and fixed to one side of the second pole tab 211b by bonding or welding, and the first pole tab 211a and the second pole tab 211b are at least partially in contact with each other to be electrically connected, that is, the first pole tab 211a and the second pole tab 211b are arranged close together.

[0054] In addition, the second pole tab 211b may protrude relative to an end of the first pole tab 211a away from the battery cell body 212 to which it is connected, and a section of the second pole tab 211b protruding relative to the first pole tab 211a may be connected to the second connection portion 420 on the corresponding side.

[0055] like Figures 1 to 3 As shown, in some embodiments, the second connection portion 420 further includes a first structural segment 4201, a second structural segment 4202 and a transition segment 4203. The transition segment 4203 is connected between the first structural segment 4201 and the second structural segment 4202, and one end of the second structural segment 4202 away from the transition segment 4203 is connected to the first connection portion 410.

[0056] Among them, the second structural segment 4202 can be in the same plane as the first connecting portion 410, that is, the second structural segment 4202 is a flat plate structure. The transition section 4203 can be an arc-shaped plate structure. In the embodiment, one end of the first structural segment 4201 extends toward the side away from the battery cell 210, and the first structural segment 4201 can be formed by bending the edge portion of the second connecting portion 420 toward the side away from the battery cell 210, and a bending angle α is formed. The transition section 4203 can play a role in smooth transition between the first structural segment 4201 and the second structural segment 4202, reduce the concentration of stress and the generation of cracks at the bending position, and thus improve the mechanical strength and durability of the connecting sheet 400.

[0057] In some embodiments, the bending angle α can be set to 0°<α<90°, which can provide sufficient redundant space for the tab 211 of the battery cell group 200 and reduce the probability of the tab 211 being inserted into the battery cell body 212. For example, in some embodiments, the bending angle α can be set to 5°, 15°, 30°, 42°, 50°, 65°, 70°, 75°, 82°, 90° or any other angle between 0° and 90° (excluding the endpoint values).

[0058] In some embodiments, a section of the second pole ear 211b protruding relative to the first pole ear 211a can be simultaneously connected to the side of the first structure segment 4201 away from the cover plate assembly 300, the side of the transition segment 4203 away from the cover plate assembly 300, and the side of the second structure segment 4202 away from the cover plate assembly 300 by ultrasonic welding. Among them, the side of the transition segment 4203 away from the cover plate assembly 300 is a curved surface, which can prevent scratches and punctures of the second pole ear 211b.

[0059] In other embodiments, the second connection portion 420 may include only the first structural segment 4201 and the transition segment 4203. The transition segment 4203 may be connected between the first structural segment 4201 and the first connection portion 410, and the second pole ear 211b may be connected to both the side of the first structural segment 4201 away from the cap plate assembly 300 and the side of the transition segment 4203 away from the cap plate assembly 300. Alternatively, the second connection portion 420 includes only the first structural segment 4201, and the second pole ear 211b may be connected to the side of the first structural segment 4201 away from the cap plate assembly 300.

[0060] In other embodiments, the second connection portion 420 may include a first structural segment 4201, a second structural segment 4202, and two transition segments 4203. The first structural segment 4201 may be disposed at one end of the second structural segment 4202 close to the first connection portion 410. The first structural segment 4201 and the first connection portion 410, and the first structural segment 4201 and the second structural segment 4202 may be connected via a transition segment 4203.

[0061] like Figure 4 and Figure 5 As shown, in other embodiments, a section of the second pole ear 211b protruding relative to the first pole ear 211a is folded to the side of the second connection portion 420 close to the cover plate assembly 300, and is connected to the side of the second connection portion 420 close to the cover plate assembly 300 by ultrasonic welding. It can be understood that the second pole ear 211b and the cover plate 350 can be separated by the second insulating member 330 to achieve insulation protection to prevent short circuit problems. In addition, the side edge of the second connection portion 420 away from one end of the first connection portion 410 (that is, the end of the first structural segment 4201 away from the first connection portion 410) is set as a rounded corner 421 to avoid scratching or piercing the second pole ear 211b, avoid causing damage to the second pole ear 211b, and improve the product yield of the battery cell 1000.

[0062] like Figure 6 As shown, in other embodiments, a section of the second pole ear 211b protruding relative to the first pole ear 211a is folded to the side of the second connection portion 420 close to the cover plate assembly 300, and is connected to the side of the second connection portion 420 close to the cover plate assembly 300. The surface of the second connection portion 420 away from the end of the first connection portion 410 (i.e., the end of the first structural segment 4201 away from the first connection portion 410) can be set as an arc surface 422, which can avoid scratching or piercing the second pole ear 211b, thereby avoiding damage to the second pole ear 211b and improving the product yield of the battery cell 1000.

[0063] In addition, a battery is provided in the embodiment, which may include the battery cell 1000 provided in the embodiment.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cell, characterized in that: It comprises a housing (100), a battery cell group (200), a cover plate assembly (300) and a connecting sheet (400); The battery cell group (200) is disposed in the housing (100), the battery cell group (200) comprises at least one battery cell (210), and any of the battery cells (210) is provided with a tab (211); The housing (100) is provided with an opening structure (110), the cover plate assembly (300) is arranged at the opening structure (110), and the cover plate assembly (300) includes a pole (310); The connecting piece (400) is arranged on a side of the cover plate assembly (300) close to the battery cell group (200), and the connecting piece (400) comprises a first connecting portion (410) and at least one second connecting portion (420), wherein the at least one second connecting portion (420) is arranged close to an edge of the first connecting portion (410), and an end of the second connecting portion (420) away from the first connecting portion (410) extends in a direction away from one side of the battery cell (210), the pole ear (211) is connected to the at least one second connecting portion (420), and the first connecting portion (410) is connected to the pole (310).

2. The battery cell according to claim 1, characterized in that: The battery cell group (200) comprises a plurality of battery cells (210); The connecting piece (400) comprises two second connecting parts (420), and the two second connecting parts (420) are respectively arranged on both sides of the first connecting part (410); The tabs (211) of a portion of the battery cells (210) are connected to one of the second connecting portions (420), and the tabs (211) of another portion of the battery cells (210) are connected to another of the second connecting portions (420).

3. The battery cell according to claim 2, characterized in that: The battery cell group (200) comprises four battery cells (210) arranged side by side; Wherein, the pole ears (211) of two adjacent battery cells (210) are arranged close together and connected to a second connecting portion (420); The pole tabs (211) of the other two adjacent battery cells (210) are arranged together and connected to another second connection portion (420).

4. The battery cell according to any one of claims 1 to 3, characterized in that: The pole tab (211) is connected to a side of the second connection portion (420) close to the battery cell group (200).

5. The battery cell according to any one of claims 1 to 3, characterized in that: The pole ear (211) is folded to a side of the second connection portion (420) close to the cover plate assembly (300), and is connected to a side of the second connection portion (420) close to the cover plate assembly (300).

6. The battery cell according to claim 5, characterized in that: A side edge of the second connection portion (420) away from one end of the first connection portion (410) is provided with a rounded corner (421).

7. The battery cell according to claim 5, characterized in that: A surface of the second connection portion (420) that is away from one end of the first connection portion (410) is configured as an arc surface (422).

8. The battery cell according to claim 1, characterized in that: The second connecting portion (420) comprises a first structural segment (4201), one end of which extends in a direction away from the battery cell (210); the first structural segment (4201) is formed by bending an edge of the second connecting portion (420) toward a side away from the battery cell (210), and forming a bending angle α, wherein 0°<α<90°.

9. The battery cell according to claim 8, characterized in that: One end of the first structural section (4201) close to the first connecting portion (410) is connected to a transition section (4203), and a side of the transition section (4203) away from the cover plate assembly (300) is an arc surface.

10. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

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