Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment. The battery monomer comprises a shell, an end cover assembly and a baffle plate. The shell is provided with a peripheral wall, and an accommodating cavity with an opening in the first direction is defined by the peripheral wall. The end cover assembly comprises an end cover, the end cover is located in the containing cavity, the end cover seals the opening, and a welding seam is formed between the end cover and the peripheral wall. And the baffle plate is annular and is positioned in the accommodating cavity. The baffle is provided with an inner ring part and an outer ring part, the inner ring part of the baffle is connected to the end cover assembly, and the outer ring part of the baffle makes contact with the peripheral wall. According to the utility model, through the arrangement of the baffle plate, the welding seam of the end cover and the peripheral wall is effectively separated from the electrolyte in the battery single body, and the corrosion at the welding part of the end cover assembly and the shell is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a battery monomer and electric equipment. BACKGROUND

[0002] With the development of energy storage, new energy vehicles and smart grid, the market demand for lithium ion battery products is increasing. Especially in the field of power batteries, the structure of square aluminum shell battery is widely used in the market at present.

[0003] In the manufacturing process of the existing square aluminum shell battery, the end cover assembly of the battery monomer is usually covered on the shell of the battery, and then welding is carried out at the joint between the end cover and the shell, so that the end cover and the shell are connected into an aluminum shell. Subsequently, electrolyte is injected into the aluminum shell through the liquid injection hole on the end cover.

[0004] However, it is found that during the use of the square aluminum shell battery, the oxides, gases and by-products in the electrolyte will react with the aluminum shell under certain conditions, causing corrosion of the shell, especially the corrosion of the welding part of the end cover and the shell, which seriously affects the safety and reliability of the square aluminum shell battery. SUMMARY

[0005] In view of the problems existing in the prior art, the utility model aims to provide a battery monomer and electric equipment to reduce the corrosion of the welding part of the end cover and the shell.

[0006] The utility model achieves the purpose by the following technical scheme:

[0007] A battery monomer comprises:

[0008] A shell has a peripheral wall, and the peripheral wall forms a containing cavity which is open in a first direction;

[0009] An end cover assembly comprises an end cover, the end cover is located in the containing cavity, the end cover seals the opening, and a welding seam is formed between the end cover and the peripheral wall;

[0010] A baffle in the form of a ring is located in the containing cavity; the baffle has an inner ring portion and an outer ring portion, the inner ring portion of the baffle is connected to the end cover assembly, and the outer ring portion of the baffle is in contact with the peripheral wall.

[0011] Further, in the first direction, the distance between the inner ring portion of the baffle and the end cover is less than the distance between the outer ring portion of the baffle and the end cover.

[0012] Still further, the baffle is in the form of an arc.

[0013] Further, the peripheral wall has a first side wall and a second side wall oppositely arranged along a second direction, and the first side wall and the second side wall are provided with protruding edges on the sides facing each other; the end cover is arranged on the protruding edges; the outer ring portion of the baffle is arranged on the side of the protruding edges facing away from the end cover; and the second direction and the first direction are perpendicular to each other.

[0014] Further, the baffle comprises two first plate portions oppositely arranged along a second direction and two second plate portions oppositely arranged along a third direction, and the thickness of the first plate portions is smaller than that of the second plate portions; and the third direction and the first direction are perpendicular to each other.

[0015] Further, the baffle comprises two first plate portions oppositely arranged along a second direction, and the thickness of the first plate portions decreases from the inner ring portion to the outer ring portion of the baffle.

[0016] Further, the end cover assembly further comprises an insulation plate arranged in the accommodating cavity and connected to the end cover; the orthographic projection of the insulation plate on the end cover is arranged in the end cover; and the inner ring portion of the baffle is connected to the insulation plate.

[0017] Further, the baffle and the insulation plate are integrally formed; or the baffle and the insulation plate are connected by means of hot melting, gluing or detachable connection.

[0018] Further, a corrosion-resistant coating is arranged on the side of the welding seam facing the baffle.

[0019] Further, the end cover assembly further comprises a drainage member arranged on the side of the insulation plate facing away from the end cover; the drainage member is connected to the baffle; the drainage member has a channel, one end of the channel penetrates through the baffle, and the other end of the channel penetrates through the insulation plate and the end cover.

[0020] A battery cell is used in an electric device.

[0021] Compared with the prior art, the battery cell has the advantages that the welding seam formed between the end cover and the peripheral wall is effectively separated from the electrolyte in the battery cell by the arrangement of the baffle, and the corrosion of the welding seam between the end cover and the shell is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the end cover assembly of the utility model;

[0023] Figure 2 is a top view of the battery cell of the utility model;

[0024] Figure 3 is an assembly schematic view of the shell and end cover assembly in the utility model;

[0025] Figure 4 is Figure 3 an enlarged schematic view of B part in the utility model;

[0026] Figure 5 is a top view of the shell in the utility model;

[0027] Figure 6 is Figure 2 a sectional view of A-A section in the utility model.

[0028] in the drawing:

[0029] 1-shell;1a-first side wall;1b-second side wall;2-housing cavity;3-end cover;4-weld;5-baffle;5a-first plate part;5b-second plate part;6-ridge;7-insulating plate;8-drainage member;81-drainage channel;9-electrode;10-annular channel;11-liquid injection hole;12-electricity core;13-overturning plate. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0031] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through the intermediate medium, can be two elements inside the communication, for the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.In addition, the technical features involved in the different embodiments of the utility model described below can be combined as long as they do not conflict with each other.

[0033] The utility model discloses a kind of battery monomer, as shown in Figures 1 to 6 Second direction and first direction are perpendicular to each other.Define third direction as Y axis positive direction, third direction and first direction are perpendicular to each other, second direction and third direction are also perpendicular to each other.

[0034] Battery monomer includes shell 1, shell 1 has circumference wall, circumference wall surrounds and constitutes the accommodation cavity 2 opening along first direction.In the embodiment, shell 1 is cuboid box body, the cuboid box body has accommodation cavity 2, the cuboid box body has one opening communicated with accommodation cavity 2 along Z axis direction, or, the cuboid box body has two openings communicated with accommodation cavity 2 and oppositely arranged along Z axis direction.In other embodiments, shell 1 can also be cylindrical or regular polygonal prism or other shapes.Meanwhile, the battery monomer of the utility model includes end cover assembly, the number of end cover assembly set and the number of opening set are same, end cover assembly includes end cover 3 and electrode 9, end cover 3 is located in accommodation cavity 2, i.e.end cover 3 is embedded in the accommodation cavity 2 surrounded by circumference wall.End cover 3 seals opening, and end cover 3 and circumference wall are connected by welding, i.e.end cover 3 and circumference wall have weld 4.

[0035] In order to solve the problem that weld 4 has been corroded after long time use of battery monomer, the battery monomer of the utility model also includes ring-shaped baffle 5, the number of baffle 5 set and the number of end cover assembly set are same, baffle 5 is located in accommodation cavity 2.Baffle 5 has inner ring part and outer ring part, and the inner ring part of baffle 5 is connected to end cover assembly, and the outer ring part of baffle 5 contacts with circumference wall.As baffle 5 outer ring part and circumference wall are in contact, as shown in Figure 3 And Figure 6 As shown, baffle 5 separates weld 4 and the part of accommodation cavity 2 accommodating electrode assembly, so that weld 4 can be protected from corrosion by gas generated by decomposition of electrolyte after long time use of battery monomer.

[0036] It should be noted that baffle 5 is made of a material that does not react with electrolyte, for example, baffle 5 is made of plastic.

[0037] Specifically, see Figure 1 , Figure 3 and Figure 6 As shown, the end cap assembly also includes an insulating plate 7. The end cap 3 has a first surface and a second surface disposed opposite to each other along the Z-axis direction. The first surface of the end cap 3 faces the outside of the battery cell, and the second surface of the end cap 3 faces the inside of the battery cell. The insulating plate 7 is located within the accommodating cavity and is connected to the second surface of the end cap 3. The insulating plate 7 is used to isolate the end cap 3 and the battery cell 12, thus insulating the end cap 3 and the battery cell 12. Considering that the high temperature generated during welding of the end cap 3 and the outer casing 1 may melt the insulating plate 7, as... Figure 4 As shown, the orthographic projection of the insulating plate 7 onto the end cover 3 is located inside the end cover 3. That is to say, the outer peripheral wall of the insulating plate 7 and the outer peripheral wall of the end cover 3 are spaced apart in any direction perpendicular to the Z-axis. In this way, the insulating plate 7 can be protected from high temperature during the welding of the end cover 3 and the outer shell 1.

[0038] Furthermore, considering the ease of connection between the baffle 5 and the end cap assembly, see [link to relevant documentation]. Figure 4 As shown, the inner ring of the baffle 5 is connected to the insulating plate 7. Preferably, the inner ring of the baffle 5 is connected to the edge of the insulating plate 7, so as to avoid reducing the effective usable area of ​​the insulating plate 7 by connecting the inner ring of the baffle 5 and the insulating plate 7 as much as possible.

[0039] Since the outer peripheral wall of the insulating plate 7 and the outer peripheral wall of the end cap 3 are spaced apart, the inner ring of the baffle 5 is connected to the edge of the insulating plate 7. It can be understood that the inner ring of the baffle 5 and the outer peripheral wall of the end cap are also spaced apart, that is, the inner ring of the baffle 5 can be protected from high temperature when the end cap 3 and the outer shell 1 are welded.

[0040] It should be noted that the baffle 5 and the insulating plate 7 can be connected in a detachable manner, such as by snap-fit. The baffle 5 and the insulating plate 7 can also be connected by heat fusion or adhesive bonding. Alternatively, the baffle 5 and the insulating plate 7 can be manufactured using a one-piece molding process.

[0041] It should also be noted that, such as Figure 1 and Figure 6 As shown, the end cap assembly also includes two flip plates 13, which are arranged opposite each other along the X-axis. Each flip plate 13 is foldably connected to the insulating plate 7. The flip plates 13 are designed to prevent the tabs of the battery cell 12 from being inserted backward into the main body of the battery cell 12, and to prevent the main body of the battery cell 12 from moving around inside the outer casing 1. In order to avoid interference between the flip plate 13 and the annular baffle 5 when the flip plate 13 is folded, the foldable connection between the flip plate 13 and the insulating plate 7 is located inside the ring of the baffle 5.

[0042] In some embodiments, such as Figure 4As shown, in order to avoid the heat generated when the end cover 3 and the shell 1 are welded to affect the baffle 5, in addition to the design of the inner ring part of the baffle 5 and the insulation plate 7 connection, the distance between the inner ring part of the baffle 5 and the end cover 3 is less than the distance between the outer ring part of the baffle 5 and the end cover 3.

[0043] In the utility model, by limiting the inner ring part and the outer ring part are arranged in the Z axis direction, that is, in the Z axis direction, the outer ring part of the baffle 5 is farther away from the welding seam 4 compared with the inner ring part, so that the influence of the heat generated in the welding process of the end cover 3 and the peripheral wall on the baffle 5 is reduced.

[0044] It should be noted that, in order to avoid the setting of the baffle 5 affecting the volume of the accommodation cavity occupied by the battery cell 12, when the outer ring part of the baffle 5 is farthest from the end cover 3, the outer ring part of the baffle 5 abuts against the main body of the battery cell 12.

[0045] Specifically, as shown in the drawings, Figure 4 In order to design the inner ring part and the outer ring part of the baffle 5 to be arranged in the Z axis direction, the cross section of the baffle 5 can be designed to be oblique, or the cross section of the baffle 5 can be designed to be arc-shaped, or the cross section of the baffle 5 can be designed to be "L" shaped.

[0046] Specifically, in the embodiment, considering that the baffle 5 needs to be deformed to pass over the convex rib 6 when the end cover assembly and the shell are assembled, the cross section of the baffle 5 is designed to be arc-shaped, so that the baffle 5 is more easily deformed.

[0047] In some embodiments, as shown in the drawings, Figures 3 to 6 The peripheral wall has a first side wall 1a and a second side wall 1b arranged opposite in the second direction. The side of the first side wall 1a facing the second side wall 1b is the inner side of the first side wall 1a, and the side of the second side wall 1b facing the first side wall 1a is the inner side of the second side wall 1b. Since the shell 1 is a cuboid box, the first side wall 1a and the second side wall 1b are two opposite side walls, as shown in the drawings, Figure 5 The first side wall 1a and the second side wall 1b are the side walls of the short side of the cuboid box.

[0048] In succession Figures 3 to 6 , considering the positioning problem when the end cover 3 is embedded in the shell 1, the side of the first side wall 1a facing the second side wall 1b and the side of the second side wall 1b facing the first side wall 1a are provided with convex ribs 6, that is, the convex ribs 6 are arranged on the inner sides of the first side wall 1a and the second side wall 1b, and the two convex ribs 6 are arranged opposite.

[0049] When the end cover assembly is assembled to the shell 1, the end cover 3 is finally placed on the convex rib 6, and the convex rib 6 is arranged to block the end cover 3 from further entering the inside of the accommodating cavity 2, thereby playing a limiting role. In the process of the baffle 5 following the end cover 3 into the accommodating cavity 2, the outer ring part of the baffle 5 first contacts the inner side of the peripheral wall, and when the outer ring part of the baffle 5 encounters the convex rib 6, the baffle 5 will be deformed and shrink due to force, so that the outer ring part of the baffle 5 can pass over the convex rib 6, and after the outer ring part of the baffle 5 passes over the convex rib 6, the baffle 5 restores the shape, that is, the outer ring part of the baffle 5 and the inner side of the peripheral wall are in contact, and finally when the end cover 3 is placed on the convex rib 6, the outer ring part of the baffle 5 is located on the side of the convex rib 6 away from the end cover 3, that is, as shown in Figure 4 , the outer ring part of the baffle 5 and the end cover 3 are located on the two sides of the convex rib 6 respectively.

[0050] It should be noted that the arrangement of the convex rib 6 can be various, for example, the convex rib 6 is composed of a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the Y-axis direction; for example, the peripheral wall further includes a third side wall and a fourth side wall arranged opposite along the Y-axis direction, and the convex rib 6 is arranged on the side of the third side wall facing the fourth side wall and the side of the fourth side wall facing the third side wall, and the specific design is determined according to the design.

[0051] It should be further noted that in order to facilitate the connection of the convex rib 6 and the peripheral wall, the convex rib 6 and the peripheral wall are designed to be integrally formed.

[0052] Further, as shown in Figures 1 to 4 , in this embodiment, because the shell is a rectangular box, the opening surrounded by the peripheral wall is a rectangle, and the baffle 5 includes two first plate parts 5a arranged opposite along the second direction and two second plate parts 5b arranged opposite along the third direction.

[0053] In the process of assembling the end cover assembly to the shell 1, because the first side wall 1a and the second side wall 1b of the peripheral wall are provided with the convex rib 6, and the contact position of the first plate part 5a with the peripheral wall is on the side of the convex rib 6 facing the accommodating cavity 2, and the end cover 3 is arranged on the side of the convex rib 6 away from the accommodating cavity 2, so that the first plate part 5a needs to be deformed in the process of passing through the convex rib 6, and the second plate part 5b hardly deforms in the process of entering the accommodating cavity 2 because there is no convex rib 6 in the movement path of the second plate part 5b, so that the deformation of the second plate part 5b in the process of entering the accommodating cavity 2 is smaller than the deformation of the first plate part 5a in the process of entering the accommodating cavity 2.

[0054] In this way, in order to facilitate the deformation of the first plate part 5a, the thickness of the first plate part 5a is smaller than the thickness of the second plate part 5b, so as to facilitate the baffle 5 to enter the accommodating cavity 2.

[0055] In this embodiment, based on the premise that the thickness of the first plate portion 5a is less than the thickness of the second plate portion 5b, in order to further facilitate the deformation of the first plate portion 5a, the thickness of the first plate portion 5a is reduced in the extension direction from the inner ring portion to the outer ring portion of the baffle 5. Since the outer ring portion of the first plate portion 5a contacts the protruding rib 6, the thinner outer ring portion of the first plate portion 5a is more easily deformed. In other embodiments, the baffle 5 includes the first plate portion 5a arranged along the second direction, but the thickness of the first plate portion 5a and other parts of the baffle 5 is not limited. That is, the first plate portion 5a can be thinner than the thickness of other parts of the baffle 5, or the thickness of the first plate portion 5a and other parts of the baffle 5 can be the same. However, it is necessary to reduce the thickness of the first plate portion 5a in the extension direction from the inner ring portion to the outer ring portion of the baffle 5, so that the outer ring portion of the baffle 5 can deform, thereby facilitating the entry of the first plate portion 5a into the receiving cavity 2. This invention facilitates deformation of the first plate portion 5a by setting the thickness of the outer ring portion of the first plate portion 5a to be thinner than the thickness of the inner ring portion of the first plate portion 5a.

[0056] In some embodiments, such as Figure 3 and Figure 4 As shown, the battery cell also includes an anti-corrosion coating. Specifically, the anti-corrosion coating is applied to the side of the weld 4 facing the baffle 5. This invention prevents corrosion of the weld 4 by applying the anti-corrosion coating.

[0057] like Figures 1 to 4 As shown, in this embodiment, the baffle 5 is annular, and its outer ring contacts the peripheral wall. Therefore, the baffle 5, insulating plate 7, end cap 3, and peripheral wall form an annular channel 10. During the battery cell production process, after the end cap assembly is assembled onto the housing 1 and the end cap 3 and housing 1 are welded, the battery cell is inverted, and then anti-corrosion liquid is injected into the annular channel 10, so that the anti-corrosion liquid forms an anti-corrosion coating on the side of the weld 4 facing the baffle 5.

[0058] Furthermore, to facilitate the injection of the anti-corrosion coating, the end cap assembly also includes a flow guide 8. The flow guide 8 is located on the side of the insulating plate 7 facing away from the end cap 3, and the flow guide 8 cooperates with the insulating plate 7 to form a flow channel 81. The flow guide 8 is connected to the baffle 5, and one end of the flow channel passes through the baffle 5, so that the flow channel 81 is connected to the annular channel 10. The other end of the flow channel 81 passes through the insulating plate 7 and the end cap 3. During the production of the battery cell, after the end cap 3 is welded to the peripheral wall, the battery cell is inverted, and then the anti-corrosion liquid is allowed to enter the annular channel 10 from the flow channel 81, ultimately forming an anti-corrosion coating on the side of the weld 4 facing the baffle 5.

[0059] It should be noted that the drainage channel 81 and the liquid injection hole 11 provided on the insulating plate 7 and the end cover 3 are independent of each other, that is, when it is required to inject electrolyte from the liquid injection hole 11, it can be ensured that the electrolyte will not flow into the annular channel 10 from the drainage channel 81; and when it is required to inject the corrosion-proof liquid from the drainage channel 81, it can be ensured that the corrosion-proof liquid will not flow into the part of the containing cavity in which the battery cell 12 is contained from the liquid injection hole 11.

[0060] The utility model discloses still a kind of electric equipment, electric equipment can be pure electric vehicle, energy storage container.In electric equipment, the battery monomer of the utility model is connected after being connected with load electricity.

[0061] In conclusion, the battery monomer of the utility model is separated from the electrolyte in the battery monomer by the setting of baffle 5, effectively weld seam 4 of end cover 3 and peripheral wall, reduce the corrosion of the welding position of end cover assembly and shell 1.And by limiting the position of inner ring part and outer ring part, the outer ring part is set away from weld seam 4.And by setting the cross section of baffle 5 as arc shape, baffle 5 is not easy to break in the process of entering containing cavity 2.And by the setting of convex rib 6, the assembly of battery monomer is facilitated.And by limiting the thickness of first plate part 5a is less than the thickness of second plate part 5b, baffle 5 is facilitated to enter containing cavity.And by setting the thickness of outer ring part of first plate part 5a is thinner than the thickness of inner ring part of first plate part 5a, the deformation of first plate part 5a is facilitated.And by the setting of insulating plate 7, battery monomer is prevented from electric leakage and open circuit.And by the setting of anticorrosive coating, weld seam 4 is prevented from rusting.And by the setting of drainage member 8, the injection of electrolyte and the formation of anticorrosive coating are facilitated.

[0062] It should be noted that: the above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model still belongs to the scope of the technical scheme of the utility model.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, comprising: a shell (1) having a peripheral wall, wherein the peripheral wall forms a containing cavity (2) which is open in a first direction; a cover assembly comprising a cover (3) which is located in the containing cavity (2), wherein the cover (3) seals the opening, and a welding seam (4) is formed between the cover (3) and the peripheral wall; a baffle (5) in the form of a ring which is located in the containing cavity (2), wherein the baffle (5) has an inner ring part and an outer ring part, the inner ring part of the baffle (5) is connected to the cover assembly, and the outer ring part of the baffle (5) is in contact with the peripheral wall.

2. The battery cell of claim 1, wherein, In the first direction, the distance between the inner ring part of the baffle (5) and the cover (3) is smaller than the distance between the outer ring part of the baffle (5) and the cover (3).

3. The battery cell of claim 2, wherein, The baffle (5) is in the form of an arc.

4. The battery cell of claim 1, wherein, The peripheral wall has a first side wall (1a) and a second side wall (1b) which are oppositely arranged in a second direction, and the first side wall (1a) and the second side wall (1b) are both provided with a convex rib (6) on the side facing the other side wall; the cover (3) is arranged on the convex rib (6); the outer ring part of the baffle (5) is located on the side of the convex rib (6) which is away from the cover (3); and the second direction is perpendicular to the first direction.

5. The battery cell of claim 4, wherein, The baffle (5) comprises two first plate parts (5a) which are oppositely arranged in the second direction and two second plate parts (5b) which are oppositely arranged in a third direction, wherein the thickness of the first plate part (5a) is smaller than the thickness of the second plate part (5b); and the third direction is perpendicular to the first direction. The baffle (5) comprises two first plate parts (5a) which are oppositely arranged in the second direction, and the thickness of the first plate part (5a) decreases from the inner ring part to the outer ring part of the baffle (5).

6. The battery cell according to any one of claims 1 to 5, characterized in that, The cover assembly further comprises an insulation plate (7) which is located in the containing cavity (2) and is connected to the cover (3); the orthographic projection of the insulation plate (7) on the cover (3) is located in the cover (3); and the inner ring part of the baffle (5) is connected to the insulation plate (7).

7. The battery cell of claim 6, wherein, The baffle (5) is integrally formed with the insulation plate (7), or the baffle (5) is connected to the insulation plate (7) by means of hot melting, gluing or detachable connection.

8. The battery cell of any one of claims 1 to 5, wherein, A corrosion-resistant coating is arranged on the side of the welding seam (4) which faces the baffle (5).

9. The battery cell of claim 6, wherein, The cover assembly further comprises a flow guide (8) which is arranged on the side of the insulation plate (7) which is away from the cover (3); the flow guide (8) is connected to the baffle (5); the flow guide (8) has a channel, one end of the channel penetrates through the baffle (5), and the other end of the channel penetrates through the insulation plate (7) and the cover (3).

10. An electric device, characterized by The application further relates to a battery comprising the battery cell as claimed in any one of claims 1 to 9.

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