Cell assemblies, batteries, battery packs, and automobiles

Abstract

The electrode assembly includes a sealing film (11), an electrode body (12), and a spacer (13), and the electrode body (12) and the spacer (13) are both located in a receiving cavity formed by being surrounded by the sealing film (11). The electrode body (12) includes an electrode body main body (121) and two electrode lead members electrically connected to the electrode body main body and having opposite polarities. The electrode body main body (121) has a length extending along a first direction and a length extending along the first direction. At both ends located on the opposite sides, the spacer (13) has V-shaped end faces (1211) having tip portions and protruding outside the electrode body main body (121), and the connection portions between the two electrode lead members and the electrode body main body (121) are located at the tip portions of the two V-shaped end faces (1211), respectively. The spacer (13) includes an inclined portion (131) located at the V-shaped end face (1211), and an electrode lead hole (1310) is provided in the inclined portion (131) to pass through the spacer (13) and lead out the electrode lead member.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application No. "202020835882.4" with the application title "Cell Assembly, Battery, Battery Pack and Automobile" filed by Wide Vision Company Limited on May 18, 2020.

[0002] This application relates to the field of batteries, and in particular, to cell assemblies, battery modules, battery packs and automobiles.

Background Art

[0003] For the power batteries of new energy vehicles, safety, endurance and service life are all important and none can be lacking. However, in the conventional die - cut tabbed cells of power batteries, when the end part is pressed, the internal positive and negative electrode plates are easily pressed and contacted, so there is a risk of short - circuit.

Summary of the Invention

[0004] The electrode body assembly according to this application includes a sealing film, an electrode body and a spacer. Both the electrode body and the spacer are located in a receiving cavity formed by being surrounded by the sealing film. The electrode body includes an electrode body main body and two electrode lead - out members that are electrically connected to the electrode body main body and have opposite polarities. The length of the electrode body main body extends along a first direction. Both ends of the electrode body main body located on the opposite sides along the first direction include V - shaped end faces with tip portions protruding outside the electrode body main body. The connection parts of the two electrode lead - out members and the electrode body main body are respectively located at the tip portions of the two V - shaped end faces. The spacer includes an inclined portion installed on the V - shaped end face, and an electrode lead - out hole for leading out the electrode lead - out member through the spacer is installed in the inclined portion.

[0005] Compared with the prior art, the beneficial effects of this application are as follows.

[0006] During the manufacturing process of electrode assemblies, when the space within the sealing film is evacuated, the pressure difference between the inside and outside of the sealing film affects the end face of the electrode body. The pressure outside the sealing film pushes the end face of the electrode body, making it prone to short circuits due to contact between the positive and negative electrode pieces inside the electrode body. By installing a spacer on the end face of the electrode body and positioning the inclined portion of the spacer on the V-shaped end face of the electrode body, the V-shaped end face of the electrode body can be prevented to some extent from being pushed, and the risk of short circuits due to contact between the positive and negative electrode pieces inside the electrode body can be avoided.

[0007] In some embodiments of the present application, the inclined portion includes a first inclined portion and a second inclined portion, the first inclined portion and the second inclined portion are connected to form a V-shaped inclined portion, and the electrode extraction hole is a through hole formed between the first inclined portion and the second inclined portion.

[0008] In some embodiments of the present application, the electrode body, at opposite ends along the first direction, further includes flat surfaces located on both sides of the V-shaped end face, and the V-shaped end face and the flat surfaces form a stepped structure.

[0009] In some embodiments of the present application, the spacer further includes a flat portion, the flat portion being placed on the flat surface.

[0010] In some embodiments of the present application, the first inclined portion and the second inclined portion are connected by the flat portion.

[0011] In some embodiments of the present application, one region of the first inclined portion and / or the second inclined portion is attached to the V-shaped end face, and the other region has a gap with the V-shaped end face.

[0012] In some embodiments of the present application, the electrode body further includes a tab drawn out from the tip of the V-shaped end face, and the electrode pull-out member is electrically connected to the tab.

[0013] The battery according to the second aspect of the present application includes the electrode assembly described above.

[0014] The battery pack according to the third aspect of the present application includes a plurality of the above-mentioned batteries.

[0015] The automobile according to the fourth aspect of this application includes the battery pack described above. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of the electrode assembly in one embodiment of the present invention. [Figure 2] This is a schematic diagram of an electrode assembly with the sealing film removed, according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of the electrode assembly in Figure 1 with the sealing film removed, according to one embodiment of the present invention. [Figure 4] This is a schematic diagram of a battery without a case, according to one embodiment of the present invention. [Figure 5] This is a schematic diagram of a battery, including a case, in one embodiment of the present invention. [Figure 6] This is a schematic diagram of the battery pack configuration in one embodiment of the present invention. [Figure 7] This is a schematic diagram of an automobile according to one embodiment of the present invention. [Modes for carrying out the invention]

[0017] The embodiments of the present application will be described in detail below, and examples of the above embodiments are shown in the drawings. Throughout, the same or similar reference numerals indicate the same or similar parts or parts having the same or similar function. The embodiments described below with reference to the drawings are illustrative and for illustrative purposes only, and should not be understood as limiting the present application.

[0018] Furthermore, in the description of this application, the directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the directions or positional relationships shown in the drawings and are merely for the purpose of easily explaining and simplifying the description of this application. They do not indicate or suggest that the shown device or component has a specific direction or must be configured and operate in a specific direction, and therefore should not be understood as limiting this application.

[0019] Furthermore, the terms "first" and "second" are for descriptive purposes only and should not be understood as indicating or suggesting relative importance, or suggesting the quantity of the technical features shown. Thus, features limited by "first" and "second" may explicitly or implicitly include one or more such features. In this description, "multiple" means two or more unless otherwise clearly and specifically limited.

[0020] In this application, unless otherwise explicitly provided and limited, terms such as "attachment," "connection," "bonding," and "fixing" should be understood in a broad sense. For example, these may include fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections via an intermediate medium; internal communication between two parts; or the interaction between two parts. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0021] The electrode body assembly according to the present application includes a sealing film, an electrode body, and a spacer. The electrode body is located within a housing cavity formed by being surrounded by the sealing film. The electrode body includes an electrode body main body and two electrode lead-out members that are electrically connected to the electrode body main body and have opposite polarities. The length of the electrode body main body extends along a first direction. Both ends of the electrode body main body located on opposite sides along the first direction include V-shaped end faces having tip portions and protruding outside the electrode body main body. The connection sites between the two electrode lead-out members and the electrode body main body are respectively located at the tip portions of the two V-shaped end faces. The spacer includes an inclined portion provided on the V-shaped end face, and an electrode lead-out hole for leading out the electrode lead-out member through the spacer is provided in the inclined portion.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows.

[0023] In the manufacturing process of the electrode body assembly, when evacuating the space inside the sealing film, affected by the internal and external air pressure difference of the sealing film, the end face of the electrode body is pushed by the external air pressure of the sealing film, and the positive electrode plate and the negative electrode plate inside the electrode body are likely to contact and cause a short circuit. A spacer is installed on the end face of the electrode body so that the pressure applied to the end of the electrode body can be buffered by the spacer. By installing the inclined portion of the spacer on the V-shaped end face of the electrode body, it is possible to avoid, to a certain extent, the pushing of the V-shaped end face of the electrode body, and further avoid the risk of short circuit caused by the contact between the positive electrode plate and the negative electrode plate inside the electrode body.

[0024] FIG. 1 is a schematic configuration diagram of an electrode body assembly in an embodiment of the present application. FIG. 2 is a schematic configuration diagram of the electrode body assembly with the sealing film removed in an embodiment of the present application. FIG. 3 is a schematic diagram of the electrode body assembly in FIG. 1 with the sealing film removed in an embodiment of the present application. As shown in FIGS. 1, 2, and 3, the electrode body assembly 10 includes a sealing film 11, an electrode body 12, and a spacer 13. The electrode body 12 and the spacer 13 are both located within a housing cavity formed by being surrounded by the sealing film 11. The electrode body 12 includes an electrode body main body 121 and two electrode lead members 122 that are electrically connected to the electrode body main body 121 and have opposite polarities. One of the two electrode lead members 122 is a positive electrode lead member, and the other is a negative electrode lead member. The length of the electrode body main body 121 extends along the first direction A. Both ends of the electrode body main body 121 located on the opposite side along the first direction A include V-shaped end faces 1211 that have tip portions and protrude outside the electrode body main body. The connection portions of the two electrode lead members 122 and the electrode body main body 121 are respectively located at the tip portions of the two V-shaped end faces 1211. The spacer 13 includes an inclined portion 131 provided on the V-shaped end face 1211, and an electrode lead hole 1310 for pulling out the electrode lead member through the spacer 13 is provided in the inclined portion 131.

[0025] In the present application, during the manufacturing process of the electrode body assembly 10, when evacuating the space inside the sealing film 11, due to the influence of the internal and external air pressure difference of the sealing film 11, the end face of the electrode body 12 is pushed by the external air pressure of the sealing film 11, and the positive electrode plate and the negative electrode plate inside the electrode body 12 are likely to contact and cause a short circuit. In order to be able to buffer the pressure applied to the end of the electrode body 12 by the spacer 13, the spacer 13 is installed on the end face of the electrode body. By installing the inclined portion 131 of the spacer 13 on the V-shaped end face 1211 of the electrode body 12, the pushing of the V-shaped end face 1211 of the electrode body 12 is avoided to a certain extent, and further the risk of short circuit due to the contact between the positive electrode plate and the negative electrode plate inside the electrode body 12 is avoided.

[0026] In some embodiments of the present application, the inclined portion 131 includes a first inclined portion 1311 and a second inclined portion 1312, the first inclined portion 1311 and the second inclined portion 1312 are connected to form a V-shaped inclined portion 131, and the electrode extraction hole 1310 is a through hole formed between the first inclined portion 1311 and the second inclined portion 1312.

[0027] The thickness of the electrode body 121 extends along the second direction B, which is perpendicular to the first direction A. The first inclined portion 1311 and the second inclined portion 1312 are arranged along the second direction B, and the electrode extraction hole 1310 is located between the first inclined portion 1311 and the second inclined portion 1312. The electrode extraction member 122 penetrates through the electrode extraction hole 1310 and through the sealing film 11 so as to be electrically connected to the anisotropic electrode extraction member of another electrode body assembly 10.

[0028] This results in a better fit between the shape of the spacer 13 and the V-shaped end face 1211 of the electrode body 12. The spacer 13 can better buffer the pressure applied to the V-shaped end face 1211 of the electrode body when the sealing film 11 is evacuated, and the pressure from other directions A. This prevents the V-shaped end face 1211 of the electrode body 12 from being pressed to some extent, and further avoids the risk of a short circuit due to contact between the positive electrode piece and the negative electrode piece within the electrode body 12.

[0029] In some embodiments of the present application, one region of the first inclined portion 1311 and / or the second inclined portion 1312 is attached to the V-shaped end face 1211, and the other region has a gap with the V-shaped end face 1211.

[0030] In some embodiments of the present application, the region of the first inclined portion 1311 adjacent to the tip of the V-shaped end face 1211 is attached to the V-shaped end face 1211, and the region of the first inclined portion 1311 away from the tip of the V-shaped end face 1211 has a gap with the V-shaped end face 1211. Similarly, the region of the second inclined portion 1312 adjacent to the tip of the V-shaped end face 1211 is attached to the V-shaped end face 1211, and the region of the second inclined portion 1312 away from the tip of the V-shaped end face 1211 has a gap with the V-shaped end face 1211. As a result, the first inclined portion 1311 curves upward relative to the corresponding V-shaped end face 1211, and the second inclined portion 1312 curves upward relative to the corresponding V-shaped end face 1211. The first inclined portion 1311 and the second inclined portion 1312 can better buffer the pressure applied to the V-shaped end face 1211 of the electrode body when the sealing film 11 is evacuated, and the pressure from other pressures from the first direction A, resulting in a higher buffering effect.

[0031] In some other embodiments of the present invention, the first inclined portion 1311 can be completely bonded to the corresponding V-shaped end face 1211, and the second inclined portion 1312 can also be completely bonded to the corresponding V-shaped end face 1211. Such an installation can also buffer the pressure applied to the V-shaped end face 1211 of the electrode body when the sealing film 11 is evacuated, and the other pressure from the first direction A, resulting in a high buffering effect.

[0032] In some embodiments of the present invention, the electrode body 121, at opposite ends along the first direction A, further includes flat surfaces 1212 located on both sides of the V-shaped end face 1211, and the V-shaped end face 1211 and the flat surfaces 1212 form a stepped structure. The V-shaped end face 1211 is the portion that forms the tab, and the flat surfaces 1212 is the portion where the tab is not installed.

[0033] In some embodiments of the present invention, the spacer 13 further includes a flat portion 132, which is placed on a flat surface 1212. The flat portion 132 acts as a fixing mechanism for the electrode body 12, preventing it from moving inside the case and further pressing the V-shaped end face 1211 when the electrode body 12 is subjected to force, and significantly reducing the risk of short circuits due to contact between the positive and negative electrode pieces within the electrode body 12.

[0034] In some embodiments of the present invention, the first inclined portion 1311 and the second inclined portion 1312 are connected by a flat portion 132. This further improves the pressure resistance strength of the spacer 13.

[0035] In some embodiments of the present application, the electrode body 12 further includes two tabs 123 drawn out from the tip of a V-shaped end face 1211, the two tabs 123 including a positive electrode tab and a negative electrode tab, and two electrode lead members 122 are each electrically connected to the two tabs 123. As shown in Figures 4 and 5, in embodiments of the present application, the battery 100 includes a case 20 and at least one cell assembly 10 sealed within the case 20, and as shown in Figure 4, a plurality of cell assemblies 10 are sealed within the case 20, and the plurality of cell assemblies 10 are arranged sequentially along a first direction A of the battery 100. When the plurality of cell assemblies 10 are connected in series, the series connection of the two cell assemblies 10 is achieved by electrically connecting the positive electrode lead member of one of the two cell assemblies 10 to the negative electrode lead member of the other cell assembly 10. The cell assembly is the cell assembly described in any of the embodiments above.

[0036] In some embodiments of the present invention, the case 20 is a metal case, such as an aluminum case. Naturally, the case may be made of other metals as needed. This ensures that the case 20 has sufficient strength to avoid crushing or deformation, thereby improving the safety of the battery 100.

[0037] In some embodiments of the present invention, the battery 100 is a rectangular parallelepiped, and the battery 100 has a length L, a thickness W, and a height H, where the length L is greater than the height H and the height H is greater than the thickness W. The length of the battery 100 is 400 to 2500 mm. The ratio of the length to the height of the battery 100 is 4 to 21.

[0038] Furthermore, the fact that battery 100 is approximately a rectangular prism does not mean that battery 100 is rectangular or cubic in shape, and that irregularities may be localized, but it may be approximately a rectangular prism or cubic, or that notches, protrusions, chamfers, arcs, and bends may be localized, but the overall shape is approximately a rectangular prism or approximately a square prism.

[0039] The battery module according to this application includes multiple batteries 100 according to this application.

[0040] The battery pack relating to this application includes a plurality of batteries 100 or battery modules relating to this application.

[0041] As shown in Figure 6, the battery pack 200 according to the present invention includes a tray 22 and a battery 100 placed in the tray 22.

[0042] The automobile 300 relating to this application includes a battery module or battery pack relating to this application.

[0043] As can be seen from the above, this invention possesses the above-mentioned excellent characteristics, and when used, it increases the effects not found in conventional technologies, making it practical and extremely valuable as a product.

[0044] The foregoing description is merely a preferred embodiment of the present application and does not limit it. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application should be included within the scope of protection.

Claims

1. An electrode assembly comprising a sealing film, an electrode body, and a spacer, The electrode body and the spacer are both located within a housing cavity surrounded by the sealing film, the electrode body includes an electrode body main body and two electrode pull-out members electrically connected to the electrode body main body and having opposite polarity, the length of the electrode body main body extends along a first direction, the ends of the electrode body main body located on opposite sides along the first direction include V-shaped end faces, the V-shaped end faces have tips and protrude outside the electrode body main body, and the connection portions of the two electrode pull-out members to the electrode body main body are each located at the tips of the two V-shaped end faces. The spacer includes an inclined portion arranged on the V-shaped end face, and an electrode extraction hole is provided in the inclined portion, penetrating the spacer, from which the electrode extraction member is pulled out. The inclined portion includes a first inclined portion and a second inclined portion, the first inclined portion and the second inclined portion are connected, and together they form a V-shaped inclined portion. The regions of the first and second inclined portions adjacent to the tip of the V-shaped end face are attached to the V-shaped end face, and the regions of the first and second inclined portions away from the tip of the V-shaped end face have a gap with the V-shaped end face. The space inside the sealing film is evacuated to a vacuum. An electrode assembly characterized by the following features.

2. The electrode assembly according to claim 1, characterized in that the electrode extraction hole is a through hole formed between the first inclined portion and the second inclined portion.

3. The electrode assembly according to claim 2, wherein both ends of the electrode body located on opposite sides along the first direction further include flat surfaces located on both sides of the V-shaped end face, and the V-shaped end face and the flat surfaces form a stepped structure.

4. The electrode assembly according to claim 3, characterized in that the spacer further includes a flat portion, the flat portion being installed on the flat surface.

5. The electrode assembly according to claim 4, characterized in that the first inclined portion and the second inclined portion are connected by the flat portion.

6. The electrode assembly according to any one of claims 1 to 5, wherein the electrode body further includes a tab drawn out from the tip of the V-shaped end face, and the electrode drawing member is electrically connected to the tab.

7. A battery comprising a case and at least one cell assembly sealed within the case, wherein the cell assembly is an electrode assembly according to any one of claims 1 to 6.

8. A battery pack characterized by including a plurality of batteries as described in claim 7.

9. An automobile characterized by including the battery pack described in claim 8.

10. A method for manufacturing an electrode assembly according to any one of claims 1 to 6, The electrode body and the spacer are placed within the containment cavity surrounded by the sealing film, and The space inside the sealing film is evacuated by vacuum. A method that includes this.

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