Patent Application
20240006728
The present application relates to the technical field of batteries, for example, to a current collector plate and a battery.
The anode current collector plate of the lithium ion battery has the function of collecting the current of the jellyroll tab and conducting the internal current to the pole to form the external current. In the actual cell safety test process, due to the structural characteristics of the anode current collector plate, the high-pressure gas inside the cell cannot be discharged in time when a thermal runaway occurs, increasing the risk of cell shell cracking and anode pole flying out.
The present application provides a current collector plate, which can not only timely cut off the connection between the pole and the jellyroll, but also facilitate the exhaust of the gas generated by the thermal runaway when a thermal runaway occurs in the battery, so as to better reduce the probability of fire or explosion of the battery.
The present application provides a battery with a low probability of fire or explosion when a thermal runaway occurs, improving the safety of the battery in use.
In a first aspect, the embodiments of the present application provide a current collector plate. The current collector plate has a jellyroll connection portion and a pole connection portion; the jellyroll connection portion is provided to be connected to a jellyroll of a battery; the pole connection portion is provided to be connected to a pole of the battery; the current collector plate is provided with a dividing groove and at least one connecting bridge provided in the dividing groove; and the connecting bridge connects the jellyroll connection portion and the pole connection portion, wherein the connecting bridge is provided to be fused to disconnect the jellyroll connection portion and the pole connection portion when the thermal runaway of the battery occurs.
In an embodiment, the pole connection portion is provided in a central region of the current collector plate; the dividing groove comprises a first groove portion provided around the pole connection portion and a plurality of second groove portions provided at intervals around the first groove portion, the plurality of second groove portions respectively communicating with the first groove portion; and one of the connecting bridges is provided in the first groove portion.
In an embodiment, the current collector plate is circular, the core connection portion is circular; the second groove portion includes a radial groove extending in a radial direction of the current collector plate and a circumferential groove extending in a circumferential direction of the current collector plate.
In an embodiment, the pole connection portion comprises a central portion and a plurality of radiation portions; the central portion is located in a central region of the current collector plate; the plurality of radiation portions are provided around the central portion; and the connecting bridge is provided at a position between two adjacent radiation portions.
In an embodiment, the connecting bridges are provided in pairs, and the connecting bridges provided in pairs are arranged symmetrically with respect to the central portion.
In an embodiment, the pole connection portion further comprises an outer peripheral portion spaced apart from the central portion; and both ends of at least one radiation portion are connected to the central portion and the outer peripheral portion, respectively.
In an embodiment, the thickness of the connecting bridge is less than the thickness of the jellyroll connection portion and the pole connection portion.
In an embodiment, the edge of the current collector plate is provided with positioning grooves.
In an embodiment, the positioning grooves are plural; and the plurality of positioning grooves are provided at intervals along a profile direction of the current collector plate. In a second aspect, the embodiments of the present application also provide a battery comprising a case, a jellyroll and the current collector plate as described above, wherein the jellyroll is provided in the case, the case being provided with a pole; the jellyroll is connected to the jellyroll connection portion; and the pole is connected to the pole connection portion.
Advantageous Effects of the Present Application. The connecting bridge is fused to disconnect the jellyroll connection portion and the pole connection portion when the battery has a thermal runaway, so as to avoid the aggravation of thermal runaway. The dividing groove can provide a gas discharge channel, facilitating the exhaust of the gas generated by the thermal runaway, so as to better reduce the probability of fire or explosion of the battery.
Advantageous Effects of the Present Application. With the current collector plate as described above, the connecting bridge is fused to disconnect the jellyroll connection portion and the pole connection portion when the battery has a thermal runaway, so that the pole and the jellyroll are disconnected, so as to avoid the aggravation of thermal runaway. The dividing groove can provide a gas discharge channel, releasing the internal pressure of the battery, reducing the risk of the case breaking of the battery and the anode pole flying out.
1, jellyroll connection portion;
2, pole connection portion; 21, central portion; 22, radiation portion; 23, outer peripheral portion;
3, dividing groove; 31, first groove portion; 32, second groove portion; 321, radial groove; 322, circumferential groove;
4, connecting bridge; 5, positioning groove;
100, case; 200, pole; 300, jellyroll.
In the description of the present application, it should be understood that the directional 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”, and the like are based on the directional or positional relationships shown in the drawings. It is merely for the purpose of describing the present application and simplifying the description, and is not intended to indicate or imply that a particular orientation, configuration and operation of the referenced device or element is required and should not be construed as limiting the scope of the present application.
Furthermore, the features defined as “first” and “second” may explicitly or implicitly comprise one or more of the features, for distinguishing descriptive features, but not for defining sequences or importance. In the description of the present application, unless otherwise indicated, the meaning of “plurality” is two or more.
In the description of the present application, unless otherwise specified and limited, the terms “mounted”, “connected with”, and “connecting” should be interpreted broadly, e.g. either fixedly or detachably or integrally. It may be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected by an intermediate medium, and can be the communication between two elements. The meaning of the above terms in this application will be understood in specific circumstances by those of ordinary skill in the art.
The structure of the current collector plate of an embodiment of the present application is described below with reference to
The present application provides a current collector plate, as shown in
In some embodiments, as shown in
In some embodiments, as shown in
In other embodiments of the present application, the shape of the dividing grooves 3 may be selected according to actual needs and is not limited to the above description. In some embodiments, as shown in
In some embodiments, as shown in
In some embodiments, as shown in
In other embodiments of the present application, the shape of the pole connection portion 2 may be selected according to actual needs, and is not limited to the above description.
The number of the connecting bridges 4 can be selected according to practical needs. In the present application, as shown in
In some embodiments, the thickness of the connecting bridge 4 is less than the thickness of the core connection 1 and the post connection 2. In this way, on the premise of ensuring the stable conduction of the jellyroll 300 and the pole 200 during the operation of the battery, it can ensure that the connecting bridge 4 can be quickly fused and disconnect the jellyroll 300 and the pole 200 when the thermal runaway of the battery occurs, so as to avoid the phenomenon that the degree of thermal runaway is increased. In some embodiments, the edge of the current collector plate is provided with positioning grooves 5 as shown in
In some embodiments, as shown in
Two embodiments of the current collector plate of the present application are described below with reference to
As shown in
As shown in
The present application also provides a battery, as shown in
In the battery of the present application, with the current collector plate as described above, the connecting bridge 4 is fused to disconnect the jellyroll connection portion 1 and the pole connection portion 2 when the battery has a thermal runaway, so that the pole 200 and the jellyroll 300 are disconnected, so as to avoid the aggravation of the thermal runaway. The dividing groove 3 can provide a gas discharge channel, releasing the internal pressure of the battery, reducing the risk of the case 100 breaking of the battery and the anode pole flying out.
In the description of this description, the description of the reference terms “some embodiments”, “other embodiments”, etc. is intended to mean that features, structures, materials, or characteristics described in connection with the embodiments or examples are intended to be included in at least one embodiment or example of the present application. In this specification, schematic statement of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022217081487 | Jul 2022 | CN | national |
This application is a continuation of International Pat. Appl. No. PCT/CN2022/125246, filed on Oct. 14, 2022, pending, which claims priority to Chinese Patent Application No. 202221708148.7 filed on Jul. 4, 2022 to the China Patent Office, the entire contents of which are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/125246 | Oct 2022 | US |
| Child | 18146313 | US |
