Battery cell, battery pack and vehicle

Abstract

The utility model discloses a battery monomer, a battery pack and a vehicle, the battery monomer comprises a core body, a first adapter, a second adapter, a first pole and a second pole, and the core body is provided with a plurality of first tabs and a plurality of second tabs; the first adapter is used for connecting the plurality of first tabs, and the second adapter is used for connecting the plurality of second tabs; the first pole is connected with the first adapter, and the second pole is connected with the second adapter. Therefore, the plurality of first tabs and the plurality of second tabs can correspondingly define a plurality of current channels, charge and discharge of the single battery can be realized through the plurality of current channels, and heat accumulation on a single tab can be improved, so that heat concentration is improved, and the probability of thermal runaway of the single battery is reduced; on one hand, the safety and the reliability of the single battery can be improved, and on the other hand, the charging overcurrent capacity of the tabs can be improved under the condition that the overcurrent area of the tabs is not increased, so that the charging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery pack and a vehicle. BACKGROUND

[0002] In the prior art, when a battery is charged, the temperature at the tab continuously increases. Further increasing the charging rate of the battery will further increase the temperature rise rate during charging, causing the temperature of the tab and even the whole battery cell to rapidly increase, resulting in a higher probability of thermal runaway of the battery monomer during charging and discharging, and poor safety and reliability. CONTENT OF THE UTILITY MODEL

[0003] The application aims to at least solve one of the technical problems in the prior art. To this end, one purpose of the application is to provide a battery monomer with higher safety and reliability.

[0004] The application further provides a battery pack with the battery monomer.

[0005] The application further provides a vehicle with the battery pack.

[0006] In a first aspect, the battery monomer according to the embodiments of the application includes a core body, a first adapter, a second adapter, a first pole and a second pole, the core body is provided with a plurality of first tabs and a plurality of second tabs; the first adapter is used to connect the plurality of first tabs, and the second adapter is used to connect the plurality of second tabs; the first pole is connected with the first adapter, and the second pole is connected with the second adapter.

[0007] The battery monomer according to the embodiments of the application can define a plurality of current channels through the plurality of first tabs and the plurality of second tabs, and can realize charging and discharging of the battery monomer through the plurality of current channels, so as to improve heat accumulation on a single tab, improve heat concentration, and reduce the probability of thermal runaway of the battery monomer. On the one hand, the safety and reliability of the battery monomer can be improved, and on the other hand, the charging overcurrent capacity of the tab can be improved without increasing the overcurrent area of the tab, so as to improve the charging efficiency.

[0008] According to some embodiments of the application, the core body is configured as a winding core, the plurality of first tabs are located on the same side of the core body in the axial direction, and the plurality of second tabs are located on the same side of the core body in the axial direction.

[0009] In some embodiments, the first adapter and the second adapter are both configured as a connecting plate.

[0010] According to some embodiments of the present application, the core comprises at least one lamination, each lamination has at least one first tab, and the first tab is located on at least one side of the lamination; at least one second tab, and the second tab is located on at least one side of the lamination.

[0011] In some embodiments, the first adapter and the second adapter are both configured as a connecting plate.

[0012] Further, the first adapter and the second adapter are both an extension plate, and the extension plate is used to connect a plurality of first tabs located on the same side of the lamination or a plurality of second tabs located on the same side of the lamination.

[0013] Further, the first adapter and the second adapter are both a bending plate, and the bending plate comprises a plurality of connected sub-plate bodies, each sub-plate body corresponds to a side of the lamination, and the connected sub-plate bodies are located on different sides of the lamination.

[0014] In some embodiments, the battery monomer further comprises a shell and an end cover, the core, the first adapter, and the second adapter are arranged in the shell, the end cover is arranged on the shell, and the first pole and the second pole are arranged on the end cover.

[0015] In a second aspect, a battery pack according to embodiments of the present application comprises the battery monomer described in the above embodiments.

[0016] In a third aspect, a vehicle according to embodiments of the present application comprises the battery pack described in the above embodiments.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0019] Figure 1 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0020] Figure 2 is a partial structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0021] Figure 3 is a structural schematic diagram of a first adapter or a second adapter according to some embodiments of the present application;

[0022] Figure 4 is another structural schematic diagram of a battery monomer according to some embodiments of the present application.

[0023] REFERENCE NUMERALS:

[0024] 100 - core body;

[0025] 210 - first tab, 211 - first left tab, 212 - first upper tab, 220 - second tab;

[0026] 310 - first pole, 311 - large head end, 320 - second pole;

[0027] 410 - first adapter, 420 - second adapter;

[0028] 410a - bending plate;

[0029] 411a - first sub-plate body, 412a - second sub-plate body, 413a - third sub-plate body, 414a - fourth sub-plate body;

[0030] 410b - extension plate. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explanation of the present application, and cannot be understood as a limitation of the present application.

[0032] According to Figures 1-3 The battery monomer, battery pack and vehicle of the embodiments of the present application are understood.

[0033] Referring to Figure 1 As shown, according to the battery monomer of the embodiments of the present application, the battery monomer comprises: a core body 100, a first adapter and a second adapter, a first pole, and a second pole.

[0034] Among them, the core body 100 is provided with a plurality of first tabs 210 and a plurality of second tabs 220, the first tabs 210 and the second tabs 220 can be formed as positive and negative tabs respectively, and are electrically connected with the core body 100 at the same time to define a current channel, and the plurality of first tabs 210 and the plurality of second tabs 220 can correspond to define a plurality of current channels.

[0035] The core 100 is further provided with a first adapter 410 and a second adapter 420. The first adapter 410 is used to connect the plurality of first tabs 210, and the second adapter 420 is used to connect the plurality of second tabs 220. Meanwhile, the first pole 310 is connected to the first adapter 410, and the second pole 320 is connected to the second adapter 420, so that the plurality of first tabs 210 can simultaneously realize electrical connection with the first pole 310 (which can be a positive pole or a negative pole), and the plurality of second tabs 220 can simultaneously realize electrical connection with the second pole 320 (which can be a negative pole or a positive pole).

[0036] More specifically, an external power source (i.e., a charging device) or a power consumption device (i.e., a load) is in communication with the first pole 310 and the second pole 320, so as to charge the battery cell through the external power source or output electrical energy of the battery cell to drive the power consumption device. The first pole 310 is connected to each first tab 210 through the first adapter 410, and the second pole 320 is connected to each second tab 220 through the second adapter 420, so that the electrical energy in the battery cell can be output through the plurality of current channels, or the electrical energy input into the battery cell by the charging device can be input through the plurality of current channels.

[0037] It is worth mentioning that the first adapter 410 and the second adapter 420 can have the same or different structures, and can be structures or components for forming a current path, such as a plate body or a wire.

[0038] In addition, the number of the first poles 310 is not limited to one, and a plurality of first poles 310 can be provided based on the number of the first tabs 210, and a corresponding number of second poles 320 can be provided. Alternatively, a plurality of second poles 320 can be provided based on the number of the second tabs 220, and a corresponding number of first poles can be provided. In this way, the same technical effect can be achieved, and the first adapter 410 can be electrically connected to the plurality of first poles 310 synchronously, and the plurality of second adapters 420 can be electrically connected to the plurality of second poles 320 synchronously.

[0039] According to the battery cell provided in the embodiments of the present application, the plurality of first tabs 210 and the plurality of second tabs 220 can define a plurality of current channels, and the charging and discharging of the battery cell can be realized through the plurality of current channels. The heat accumulation on a single tab can be improved, the heat concentration can be improved, and the probability of thermal runaway of the battery cell can be reduced. On the one hand, the safety and reliability of the battery cell can be improved. On the other hand, the charging overcurrent capacity of the tab can be improved without increasing the overcurrent area of the tab, so as to improve the charging efficiency.

[0040] It can be understood that the core in the battery cell can be configured as a roll core structure or a laminated structure. Hereinafter, the structure of the battery cell of the embodiment of the application is specifically described in a feasible form of the application configured as a roll core structure and a feasible form configured as a laminated structure.

[0041] First, the case where the core 100 includes at least one laminated sheet is described.

[0042] Specifically, a plurality of laminated sheets are arranged in layers, and each laminated sheet has at least one first tab 210 located on at least one side of the laminated sheet, and at least one second tab 220 located on at least one side of the laminated sheet.

[0043] The laminated sheet can be a rectangular structure, and the rectangular structure includes a length side and a width side. The first tab 210 on at least one side of the laminated sheet means that the first tab 210 can be arranged only on the length side, or only on the width side, or on both the length side and the width side. Of course, the number of first tabs 210 on the length side and the width side is not limited to one. The second tab 220 on at least one side of the laminated sheet means that the second tab 220 can be arranged only on the length side, or only on the width side, or on both the length side and the width side. Of course, the number of second tabs 220 on the length side and the width side is not limited to one.

[0044] In other words, on the laminated core, the length side and the width side of the projection profile defined by the projection in the overlapping direction can be provided with the first tab 210 and the second tab 220.

[0045] For example, as shown in FIGS. 1 and 2, the core 100 includes a plurality of laminated sheets 200 arranged in layers, and each laminated sheet 200 has at least one first tab 210 and at least one second tab 220. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, two laminated sheets are arranged to define the core 100, and each laminated sheet is provided with two first tabs 210, i.e., a first left tab 211 arranged on the left side of the laminated sheet and a first upper tab 212 arranged on the upper side of the laminated sheet (see FIG. 2). Figure 2

[0046] Figure 2 ​In the embodiment, the upper side of the lamination is provided with a first pole 310, the first pole 310 has a large end 311, a column body (not shown in the figure) extending below the large end 311, and a first adapter 410 and a first upper pole lug 212 are sequentially arranged between the large end 311 and the upper surface of the lamination; the first upper pole is a C-shaped bending structure with one side opening, and the openings of the two first upper poles arranged on two adjacent laminations are oppositely arranged. The first adapter 410 extends to the left side of the lamination and is connected with the end of the first left pole lug 211, and the first left pole lug 211 is connected with the left side of the lamination.

[0047] It can be understood that a plurality of first pole lugs 210 are arranged on different sides of the lamination to form a plurality of current paths, so that the function of shunt can be realized, and since the first pole lug 210 is arranged on the side wall of the lamination structure, the first adapter 410 can be arranged in extension along the lamination structure, so that a plurality of pole lugs can be arranged without occupying too much space.

[0048] In a further embodiment, the above-mentioned embodiments are combined Figure 2 It can be understood that the specific structure of the first adapter 410 and the second adapter 420, the first adapter 410 and the second adapter 420 are both connected to the connecting plate, and the connecting plate can extend along the outer contour of the lamination structure to match the lamination structure, so as to better adapt to the cavity for accommodating the battery.

[0049] It is worth noting that the present embodiment mainly takes the case that the first connecting plate is connected to the first pole 310 and the second connecting plate is connected to the second pole 320 as an example for description, but those skilled in the art can also associate the above-mentioned connection mode and replace it with: one first pole lug 210 is directly connected to the first pole 310, and then connected to other first pole lugs 210 through the first connecting plate, or one second pole lug 220 is directly connected to the second pole 320, and then connected to other first pole lugs 210 through the second connecting plate.

[0050] Next, the structure of the connecting plate will be described in detail.

[0051] First, the above-mentioned embodiments are combined Figure 2 The case shown corresponds to an example in which the first adapter 410 and the second adapter 420 are both: a bending plate 410a, the bending plate 410a includes a plurality of connected sub-plate bodies, each sub-plate body corresponds to one side of the lamination, and the connected sub-plate bodies are located on the opposite sides of the lamination.

[0052] Specifically, the first pole lug 210 is taken as an example for description, the first pole lug 210 can be arranged on different sides of the lamination structure, in order to connect the first pole lugs 210 on different sides, the connecting plate of the first connecting piece is arranged to surround the structure of the battery cell, in other words, the first pole lugs 210 on different sides are connected through the bending plate 410a.

[0053] For example, continuing to refer to the case shown in Figure 2 , the first left lug 211 and the first upper lug 212 are arranged on the laminated sheet, the first sub-plate body 411 is connected to the first upper lug 212 and is attached to the lower surface of the large head end 311 of the pole on one side and to the upper surface of the first upper lug 212 on the other side, the first sub-plate body 411 extends outwards to the first left lug 211 with the second sub-plate body 412 bent, and the first sub-plate body 411 is perpendicular to the second sub-plate body 412. In addition, the two laminated sheets are arranged in an overlapping manner, the lower surface of the first sub-plate body 411 is attached to the first upper lug 212 of both laminated sheets, and the end of the second sub-plate body 412 is connected to the first left lug 211 of both laminated sheets.

[0054] The first connecting piece connects both the first left lug 211 and the first upper lug 212 to the first lug 210, so that when the laminated sheets are arranged in an overlapping manner, the first lugs 210 on each laminated sheet can be connected by a bent plate 410a to form multiple current channels.

[0055] The bent structure of the second adapter 420 is basically the same as that of the first adapter 410, which will not be described here.

[0056] In other examples, further reference is made to the case shown in Figure 3 , it can be understood that the bent plate 410a can be arranged as shown in Figure 2 , including the first bent part 411a and the second bent part 412a, or as shown in Figure 3 1°, including the first bent part 411a, the second bent part 412a, and the third bent part 413a, or as shown in Figure 3 2°, including the first bent part 411a, the second bent part 412a, the third bent part 413a, and the fourth bent part 414a.

[0057] It can be understood that the bent plate 410a can be adapted to be connected to the first lug 210 or the second lug 220 arranged on different side walls of the laminated sheet structure, thereby forming more current channels and further shunting the current generated during the charging process, thereby relieving the heating at each channel.

[0058] In some embodiments, with reference to Figure 4 , it can be understood that the first adapter 410 and the second adapter 420 can also be arranged as an extension plate 410b, which extends and is connected to different first lugs 210 or second lugs 220.

[0059] For example Figure 4As shown, the extension plate 410b is used to connect multiple first tabs 210 on the same side of the laminated sheet, the first tabs 210 are two and are both arranged on the same side of the laminated sheet, the extension plate 410b is a straight plate structure, and both ends of the straight plate are connected with the first tabs 210.

[0060] For example, multiple second tabs 220 on the same side of the laminated sheet are connected, and the second tabs 220 can be two and are both arranged on the same side of the laminated sheet, the extension plate 410b is a straight plate structure, and both ends of the straight plate are connected with the second tabs 220.

[0061] It can be understood that the multiple first tabs 210 or the multiple second tabs 220 are connected by the extension plate 410b to form a current channel between the first pole 310 and the multiple first tabs 210 or between the second pole 320 and the multiple second tabs 220, thereby realizing the function of shunt.

[0062] It is worth mentioning that in addition to the aforementioned example of arranging the core 100 into a laminated sheet structure, the core 100 can also be arranged into a roll core. Next, the case where the core 100 is constructed as a roll core is described.

[0063] In some embodiments, the core 100 is constructed as a roll core, multiple first tabs 210 are located on the same axial side of the core 100, and multiple second tabs 220 are located on the same axial side of the core 100, in other words, since the roll core is usually formed by alternately winding continuous electrode sheets and separators to form a cylindrical or flat roll structure. Therefore, in this structure, the side wall is tightly fitted, and it is not suitable to directly arrange the tabs on the side wall, and the tabs can be led out on both axial sides of the roll core, that is, the first tabs 210 are multiple, and the multiple first tabs 210 can be located on both axial sides of the roll core, and the multiple second tabs 220 can also be located on both axial sides of the roll core, and the multiple first tabs 210 and the multiple second tabs 220 are spaced apart in the radial direction to reduce the probability of short circuit of the core and improve the reliability.

[0064] Specifically, for the roll core structure, the multiple first tabs 210 and the multiple second tabs 220 can be arranged at one end or both ends of the roll core, that is, at both axial ends of the roll core, and these tabs can be connected with the electrode material inside the roll core by welding or crimping to ensure effective transmission of current.

[0065] For example, in a cylindrical battery cell of the roll core structure, the first tabs 210 and the second tabs 220 are arranged at the end of the cylinder formed by the roll core, and the multiple first tabs 210 and the multiple second tabs 220 are connected with the electrode material inside the roll core by laser welding or ultrasonic welding, and two first tabs 210 are arranged at one end of the roll core structure and two second tabs 220 are arranged at the other end.

[0066] The battery cell according to the embodiments of the present application further comprises a shell and an end cover, the core body 100, the first adapter 410 and the second adapter 420 are arranged in the shell, and the end cover is arranged on the shell, and the first pole 310 and the second pole 320 are arranged on the end cover.

[0067] The battery cell disclosed in the present application is also suitable for realizing shunting through the plurality of first and second tabs 210 and 220 during discharging, which is similar to the shunting during the charging process and will not be described here.

[0068] The battery pack according to the present application comprises the battery cell described in any one of the preceding embodiments.

[0069] The battery pack according to the embodiments of the present application adopts the battery cell described above, on the one hand, the safety and reliability of the battery pack are higher, and on the other hand, the charging efficiency of the battery pack is higher, and the use experience is better.

[0070] The vehicle according to the present application comprises the battery pack described in the preceding embodiments.

[0071] The vehicle according to the embodiments of the present application, on the one hand, can realize fast charging, overcome the industry pain point, and improve the product competitiveness of the vehicle, and on the other hand, the heat accumulation during the charging and discharging process of the vehicle is less, the probability of thermal runaway of the battery pack is lower, and the safety and reliability of the vehicle can also be improved.

[0072] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In the description of the present application, “first feature” and “second feature” can include one or more features.

[0074] In the description of the present application, “a plurality of” means two or more.

[0075] In the description of the present application, the first feature can be “above” or “below” the second feature, which can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0076] In the description of the application, above, over and on are used to indicate that the first feature is above, over or on the second feature, either directly or obliquely, or simply that the first feature is higher than the second feature.

[0077] In the description of the application, references to "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an illustrative embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the application have been illustrated and described, it will be clear to those of ordinary skill in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the principles and the spirit of the application. The scope of the application is limited only by the claims and the equivalents thereof.

Claims

1. A battery cell, characterized in that, include: A core (100) having a plurality of first tabs (210) and a plurality of second tabs (220) disposed thereon; A first adapter (410) and a second adapter (420), wherein the first adapter (410) is used to connect a plurality of first tabs (210), and the second adapter (420) is used to connect a plurality of second tabs (220). A first pole (310) and a second pole (320), wherein the first pole (310) is connected to the first adapter (410) and the second pole (320) is connected to the second adapter (420).

2. The battery cell according to claim 1, characterized in that, The core (100) is constructed as a wound core, with a plurality of first tabs (210) located on the same side of the axial direction of the core (100), and a plurality of second tabs (220) located on the same side of the axial direction of the core (100).

3. The battery cell according to claim 2, characterized in that, Both the first adapter (410) and the second adapter (420) are constructed as connecting plates.

4. The battery cell according to claim 1, characterized in that, The core (100) includes at least one lamination, each lamination having at least one first tab (210), and the first tab (210) being located on at least one side of the lamination; At least one second tab (220) is located on at least one side of the stack.

5. The battery cell according to claim 4, characterized in that, Both the first adapter (410) and the second adapter (420) are constructed as connecting plates.

6. The battery cell according to claim 5, characterized in that, Both the first adapter (410) and the second adapter (420) are extension plates (410b), which are used to connect multiple first tabs (210) located on the same side of the stack, or multiple second tabs (220) located on the same side of the stack.

7. The battery cell according to claim 5, characterized in that, Both the first adapter (410) and the second adapter (420) are: a bending plate (410a), the bending plate (410a) includes a plurality of connected sub-plates, each of the sub-plates is located on one side of the stack, and the connected sub-plates are located on the opposite side of the stack.

8. The battery cell according to any one of claims 1-7, characterized in that, It also includes: a housing and an end cap, wherein the core (100), the first adapter (410), and the second adapter (420) are all disposed in the housing, the end cap is disposed on the housing, and the first pole post (310) and the second pole post (320) are disposed on the end cap.

9. A battery pack, characterized in that, include: The battery cell according to any one of claims 1-8.

10. A vehicle, characterized in that, include: The battery pack according to claim 9.

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