Pole piece, laminated battery and electric equipment
By designing the recessed side of the electrode plate, the exhaust space in the battery case is constructed, which solves the problems of high-voltage short circuit and fire and explosion when the lithium-ion battery is thermally out of control, and significantly improves the safety of the battery.
Patent Information
- Application Number
- CN202421024960.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-11
AI Technical Summary
When existing lithium-ion batteries are thermally out of control, high-temperature gases are prone to accumulate and lead to high-pressure short circuits, increasing the risk of fire and explosion.
An electrode sheet is designed, with the first side portion of the second side portion being recessed toward the second side, thereby constructing an exhaust space in the battery case to ensure that high-temperature and high-pressure gas can be effectively discharged and reduce the risk of fire and explosion of the battery pack.
By constructing the exhaust space, the risk of fire and explosion of the battery pack when it is thermally out of control is effectively reduced and the safety of the battery is improved.
Smart Images
Figure CN222653966U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a pole piece, a laminated battery and electrical equipment. Background Art
[0002] With the continuous development of the new energy industry, the penetration rate of electric vehicles in our daily lives is getting higher and higher. People's anxiety about electric vehicles has gradually shifted from the previous range to the safety of batteries.
[0003] With the increasing number of battery cell structures, the location and number of battery cell explosion-proof valves are also constantly changing. At present, there are two locations for lithium-ion battery explosion-proof valves. One is that the explosion-proof valve is on the same side as the positive and negative poles. When the battery cell has thermal runaway, high-temperature gas will be generated inside the shell, move to the explosion-proof valve and gather. Since the explosion-proof valve and the pole ear are on the same side, the high-temperature gas is easy to gather here, and the erupted material is easy to accumulate in the pressure relief channel, causing a high-voltage short circuit. The other is that the explosion-proof valve and the positive and negative poles are not on the same side, which can avoid high-voltage short circuits.
[0004] The internal space utilization rate of the laminated battery is high, but there is little reserved space inside the battery, and the gas flow space is small during thermal runaway, so the battery will catch fire and explode when thermal runaway occurs. Utility Model Content
[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a pole piece, which can better construct an exhaust space in the battery shell and reduce the risk of fire and explosion.
[0006] According to the pole piece of the embodiment of the present utility model, the pole piece has a first side surface and a second side surface that are opposite to each other, and at least a portion of the first side surface is recessed toward the second side surface.
[0007] According to the pole piece of the embodiment of the utility model, by designing the shape of the pole piece, the pole piece can better construct an exhaust space in the battery shell after being constructed into an electrode group. After the electrode group has thermal runaway, it can be beneficial to the discharge of high-temperature and high-pressure gas, which can better reduce the risk of fire and explosion of the electrode group.
[0008] In addition, the pole piece according to the utility model may also have the following additional technical features:
[0009] In some embodiments of the present invention, the first side surface includes a middle plane and a first inclined plane and a second inclined plane connected to two sides of the middle plane.
[0010] In some embodiments of the present invention, the middle plane is parallel to the second side surface.
[0011] In some embodiments of the present invention, the first inclined surface and the second inclined surface are symmetrically arranged on both sides of the middle plane.
[0012] In some embodiments of the present invention, the recessed depth H of the first side surface satisfies: 1 mm ≤ H ≤ 3 mm.
[0013] The utility model also provides a laminated battery having the pole pieces of the above embodiment.
[0014] The laminated battery according to the embodiment of the present invention comprises a battery shell and an electrode group, wherein the electrode group is installed in the battery shell, and the electrode group comprises a plurality of stacked electrode sheets.
[0015] According to the laminated battery of the embodiment of the utility model, by making the electrode group composed of the electrode pieces of the above-mentioned embodiment, the electrode group can better construct an exhaust space in the battery shell, which is beneficial to better exhaust the laminated battery during thermal runaway and can better reduce the risk of fire or explosion of the laminated battery.
[0016] In some embodiments of the present invention, the first side surfaces of the plurality of pole pieces are located at the lower side of the electrode group so that the electrode group forms a groove opening downward, and an explosion-proof valve opposite to the groove is provided on the bottom plate of the battery shell.
[0017] In some embodiments of the present invention, the explosion-proof valve is arranged below the exact center of the groove.
[0018] In some embodiments of the present invention, the electrode sheet includes a positive electrode sheet and a negative electrode sheet, the positive electrode tab of the positive electrode sheet is located at one end of the electrode group, and the negative electrode tab of the negative electrode sheet is located at the other end of the electrode group.
[0019] The utility model also provides an electrical device having the laminated battery of the above embodiment.
[0020] According to the electrical equipment of the embodiment of the utility model, by being provided with the laminated battery of the above embodiment, the risk of fire and explosion of the electrical equipment caused by thermal runaway of the laminated battery can be reduced well, thereby making the electrical equipment highly reliable and safe.
[0021] Optionally, the electrical equipment may be a vehicle, a water heater, a vacuum cleaner, a computer, etc., and the present utility model does not impose any limitation thereto.
[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0024] Figure 1 It is a schematic diagram of the structure of a pole piece according to an embodiment of the utility model.
[0025] Figure 2 It is a schematic structural diagram of an electrode group according to an embodiment of the utility model.
[0026] Figure 3 It is a schematic structural diagram of a laminated battery according to an embodiment of the utility model.
[0027] Reference numerals:
[0028] Pole sheet 1, positive electrode sheet 11, positive electrode ear 111, negative electrode sheet 12, negative electrode ear 121, first side surface 13, first inclined surface 131, second inclined surface 132, middle plane 133, second side surface 14,
[0029] Laminated battery 100, battery shell 2, electrode group 3, explosion-proof valve 4, DETAILED DESCRIPTION
[0030] The embodiments of the present invention 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 invention, and cannot be understood as limiting the present invention.
[0031] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the present utility model can be understood according to specific circumstances.
[0033] Reference below Figure 1-Figure 3 A pole piece 1 according to an embodiment of the present invention is described.
[0034] like Figure 1-Figure 3 As shown, according to the pole piece 1 of the present invention, the pole piece 1 has a first side surface 13 and a second side surface 14 opposite to each other, and at least a portion of the first side surface 13 is recessed toward the second side surface 14. Figure 1-Figure 3 As shown, the side of the pole piece 1 is roughly rectangular, and the long side of one side of the rectangle is concave toward the inside. Exemplarily, multiple pole pieces 1 can be stacked to construct an electrode group 3. Since the first side 13 of the pole piece 1 has a shape that is concave toward the second side 14, the electrode group 3 can better construct an exhaust space in the battery shell 2. When the electrode group 3 has thermal runaway, the high-temperature and high-pressure gas can flow to the exhaust space and then flow out from the exhaust space, which can avoid the high-temperature and high-pressure gas from being unable to be discharged in time, thereby better reducing the risk of fire and explosion of the electrode group 3.
[0035] According to the pole piece 1 of the embodiment of the utility model, the shape of the pole piece 1 is designed so that the pole piece 1 can better construct an exhaust space in the battery shell 2 after being constructed into the electrode group 3. After the electrode group 3 thermally runs away, it can be beneficial to discharge high-temperature and high-pressure gas, which can better reduce the risk of fire and explosion of the electrode group 3.
[0036] In some embodiments of the present invention, the first side surface 13 includes a middle plane 133 and a first inclined surface 131 and a second inclined surface 132 connected to both sides of the middle plane 133. Such a design has a simple structure and is easy to process, which can reduce the processing cost.
[0037] References Figure 1-Figure 3 In an example shown, the first side surfaces 13 of the plurality of pole pieces 1 are all located on the lower side of the electrode group 3, so that the electrode group 3 forms a groove with an opening facing downward, and the groove and the battery shell 2 form an exhaust space, and in the left and right directions, the electrode group 3 has legs located on both sides of the exhaust space, so as to better support the electrode group 3, and such a design of the pole piece 1 can also better increase the size of the pole piece 1, thereby improving the capacitance of the pole piece 1.
[0038] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the middle plane 133 is parallel to the second side surface 14, so that the electrode group 3 can construct a trapezoidal exhaust space in the battery shell 2, and the size of the exhaust space gradually increases from top to bottom, so that the gas can be better discharged downward.
[0039] Alternatively, if Figure 1-Figure 3 As shown, the first inclined surface 131 and the second inclined surface 132 are symmetrically arranged on both sides of the middle plane 133, that is, the electrode group 3 can construct a trapezoidal exhaust space in the battery shell 2, and the trapezoid is an isosceles trapezoid, thereby, in the direction from top to bottom, it can be beneficial for the gas to diffuse and discharge downward evenly, and can better avoid the gas from generating vortices or eddies in the exhaust space, thereby reducing the damage caused to the electrode group 3 and the battery shell 2 by the high-temperature and high-pressure gas.
[0040] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the concave depth H of the first side surface 13 satisfies: 1mm≤H≤3mm. That is to say, when the concave depth of the first side surface 13 of the pole piece 1 satisfies the above dimensions, an exhaust space can be better constructed in the battery shell 2 while ensuring the capacitance of the pole piece 1, that is, the exhaust requirement can be better met.
[0041] In one example, the recess depth H of the first side surface 13 may be the dimension between the lower edges of the pole piece 1 on the middle plane 133 in the up and down directions.
[0042] The present utility model also provides a laminated battery 100 having the pole piece 1 of the above embodiment.
[0043] like Figure 1-Figure 3 As shown, the laminated battery 100 according to the embodiment of the present invention comprises a battery shell 2 and an electrode group 3. The electrode group 3 is installed in the battery shell 2, and the electrode group 3 comprises a plurality of stacked electrode sheets 1.
[0044] According to the laminated battery 100 of the embodiment of the utility model, by making the electrode group 3 composed of the electrode piece 1 of the above-mentioned embodiment, the electrode group 3 can better construct an exhaust space in the battery shell 2, which is beneficial to better exhaust the laminated battery 100 during thermal runaway, and can better reduce the risk of fire or explosion of the laminated battery 100.
[0045] In some embodiments of the present invention, Figure 1-Figure 3As shown, the first side surfaces 13 of the plurality of pole pieces 1 are all located at the lower side of the electrode group 3, so that the electrode group 3 is configured with a groove opening downward, and an explosion-proof valve 4 opposite to the groove is provided on the bottom plate of the battery shell 2. Thus, when thermal runaway occurs in the electrode group 3, high-temperature and high-pressure gas can be discharged toward the groove, and then the gas in the groove can be better discharged toward the explosion-proof valve 4, and then can better break through the explosion-proof valve 4 and be discharged.
[0046] Optionally, the pole piece 1 has a first side surface 13 and a second side surface 14 relative to each other, at least part of the first side surface 13 is recessed toward the second side surface 14, the first side surface 13 includes a middle plane 133 and a first inclined surface 131 and a second inclined surface 132 connected to both sides of the middle plane 133, the middle plane 133 is parallel to the second side surface 14, and the first inclined surface 131 and the second inclined surface 132 are symmetrically arranged on both sides of the middle plane 133. Thus, the groove is configured as an isosceles trapezoidal groove with an opening downward, which is not only conducive to the collection of high-temperature and high-pressure gas, but also conducive to the discharge of high-temperature and high-pressure gas when thermal runaway occurs in the electrode group 3. The exhaust space of the present application is large, and the groove is configured as an isosceles trapezoidal groove, which can be conducive to the uniformity and stability of the airflow, and can better avoid the bottom surface of the battery shell 2 or even the bottom support plate from being damaged by hot melt, thereby reducing the risk of the electrode group 3 blocking the explosion-proof valve 4 after collapse.
[0047] Of course, it is understandable that the groove may not be an isosceles trapezoidal groove, or even a trapezoidal groove, and this application does not limit this. As long as the groove is constructed, the risk of the electrode group 3 blocking the explosion-proof valve 4 after collapse can be reduced.
[0048] In some embodiments of the present invention, the explosion-proof valve 4 is arranged below the center of the groove, so that the high-temperature and high-pressure gas gathered in the exhaust space can flow toward the explosion-proof valve 4 more evenly, and then flow out from the explosion-proof valve 4, and the gas discharge stability is good.
[0049] In some embodiments of the utility model, the electrode sheet 1 includes a positive electrode sheet 11 and a negative electrode sheet 12. The positive electrode ear 111 of the positive electrode sheet 11 is located at one end of the electrode group 3, and the negative electrode ear 112 of the negative electrode sheet 12 is located at the other end of the electrode group 3. Such a design is not only conducive to the series and parallel connection of the electrode groups 3, but also, after the electrode group 3 has thermal runaway, the positive electrode group 3 is not prone to short circuit, which can better improve the safety of the laminated battery 100.
[0050] The utility model also provides an electrical device having the laminated battery 100 of the above embodiment.
[0051] According to the electrical equipment of the embodiment of the utility model, by providing the laminated battery 100 of the above embodiment, the risk of fire and explosion of the electrical equipment caused by thermal runaway of the laminated battery 100 can be effectively reduced, thereby making the electrical equipment highly reliable and safe.
[0052] Optionally, the electrical equipment may be a vehicle, a water heater, a vacuum cleaner, a computer, etc., and the present utility model does not impose any limitation thereto.
[0053] Other structures and operations of the pole piece 1, laminated battery 100 and electrical equipment according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.
[0054] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0055] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A pole piece, characterized in that: The pole piece has a first side surface and a second side surface that are opposite to each other, and at least a portion of the first side surface is recessed toward the second side surface.
2. The pole piece according to claim 1, characterized in that: The first side surface includes a middle plane and a first inclined plane and a second inclined plane connected to two sides of the middle plane.
3. The pole piece according to claim 2, characterized in that: The middle plane is parallel to the second side surface.
4. The pole piece according to claim 2, characterized in that: The first inclined surface and the second inclined surface are symmetrically arranged on both sides of the middle plane.
5. The pole piece according to claim 1, characterized in that: The recessed depth H of the first side surface satisfies: 1 mm ≤ H ≤ 3 mm.
6. A laminated battery, characterized in that: include: Battery case; An electrode group, wherein the electrode group is installed in the battery shell, and the electrode group comprises a plurality of stacked pole pieces, and the pole pieces are the pole pieces according to any one of claims 1 to 5.
7. The laminated battery according to claim 6, characterized in that: The first side surfaces of the plurality of pole pieces are all located at the lower side of the electrode group, so that the electrode group forms a groove with an opening facing downward, and an explosion-proof valve opposite to the groove is arranged on the bottom plate of the battery shell.
8. The laminated battery according to claim 7, characterized in that: The explosion-proof valve is arranged below the exact center of the groove.
9. The laminated battery according to claim 6, characterized in that: The electrode sheets include a positive electrode sheet and a negative electrode sheet. The positive electrode tab of the positive electrode sheet is located at one end of the electrode group, and the negative electrode tab of the negative electrode sheet is located at the other end of the electrode group.
10. An electrical device, characterized in that: A laminated battery comprising any one of claims 6-9.