Battery cell cover plate and battery cell

Abstract

This utility model relates to the field of battery cell technology, and provides a battery cell cover plate and a battery cell. The battery cell cover plate includes: a cover plate body with a first through hole; a lower plastic plate disposed on one side of the cover plate body and having a second through hole; an electrode post including a mounting plate and a connecting post, the mounting plate being located on the side of the lower plastic plate away from the cover plate body, and the connecting post being connected to the mounting plate and passing through the first through hole and the second through hole; and a heat insulation component disposed between the mounting plate and the lower plastic plate. By providing a heat insulation component between the lower plastic plate and the electrode post, this battery cell cover plate can reduce the heat conducted from the electrode post to the lower plastic plate during welding, thereby preventing insulation failure between the electrode post and the aluminum plate due to the melting of the lower plastic plate.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a battery cell cover plate and a battery cell. Background Technology

[0002] A battery cell generally consists of a housing, electrode assembly, and cell cover. The electrode assembly is housed inside the housing, and the cell cover is placed on top of the housing to seal the electrode assembly inside. The cell cover typically consists of an aluminum plate and a lower plastic plate. The aluminum plate is separated from the electrode post by the lower plastic plate, thereby achieving insulation.

[0003] In the cell manufacturing process, the tabs of the electrode assembly need to be welded to the terminals on the cover plate. During the welding process, if the welding temperature is too high, the lower plastic plate will melt and lose its insulating function, causing the terminals to conduct through the aluminum plate and resulting in a short circuit. Utility Model Content

[0004] This utility model provides a cell cover plate and a cell to solve the problem in the prior art that the lower plastic plate of the cell cover plate is prone to melting during the electrode welding process.

[0005] This utility model provides a battery cell cover plate, comprising:

[0006] The cover plate body is provided with a first through hole;

[0007] The lower plastic plate is disposed on one side of the cover plate body and has a second through hole;

[0008] The pole includes a mounting plate and a connecting post. The mounting plate is located on the side of the lower plastic plate away from the cover plate body. The connecting post is connected to the mounting plate and passes through the first through hole and the second through hole.

[0009] A heat insulation component is disposed between the mounting plate and the lower plastic plate.

[0010] According to the present invention, a battery cell cover plate is provided with a positioning groove on the side of the lower plastic plate away from the cover plate body. The shape of the positioning groove is adapted to the shape of the mounting plate. The mounting plate and the heat insulation component are disposed in the positioning groove.

[0011] According to the present invention, a battery cell cover plate is provided, wherein the heat insulation component includes a bottom plate and a side plate connected together, the bottom plate being located between the mounting plate and the bottom of the positioning groove, and the side plate being located between the mounting plate and the side wall of the positioning groove.

[0012] According to the present invention, the end of the side plate away from the bottom of the groove is lower than the opening of the positioning groove, and the height difference between the end of the side plate away from the bottom of the groove and the opening of the groove is h, 0.2≤h≤0.3mm.

[0013] According to the present invention, the thickness of the bottom plate is t1, 0.3mm≤t1≤0.6mm; and / or the thickness of the side plate is t2, 0.2mm≤t2≤0.4mm.

[0014] According to the present invention, one of the side wall of the positioning groove and the side plate is provided with a positioning protrusion, and the other is provided with a positioning groove, wherein the positioning protrusion and the positioning groove are positioned and engaged.

[0015] According to the present invention, a battery cell cover plate is provided, wherein the mounting plate includes a first mounting part and a second mounting part connected together, the connecting post is connected to the first mounting part, the heat insulation member is disposed between the second mounting part and the lower plastic plate, and the second mounting part is used for welding to the electrode tab.

[0016] According to the present invention, a battery cell cover plate is provided in which the first mounting part and the lower plastic plate have a gap in the thickness direction of the lower plastic plate.

[0017] According to the present invention, a battery cell cover plate is provided in which the heat insulation component is bonded, fused, or snapped to the lower plastic plate.

[0018] This utility model also provides a battery cell, comprising: a housing, an electrode assembly, and any one of the above-mentioned battery cell cover plates, wherein the housing has an opening, the battery cell cover plate is disposed in the opening, the battery cell cover plate and the housing surround to form a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the electrode tabs of the electrode assembly are connected to the mounting plate.

[0019] The battery cell cover and battery cell provided by this utility model can reduce the heat conducted from the electrode to the lower plastic plate during the welding process by setting a heat insulation component between the lower plastic plate and the electrode post. This avoids insulation failure between the electrode post and the aluminum plate due to the melting of the lower plastic plate, and also ensures the normal hot-melt assembly of the inner insulation film of the battery cell with the lower plastic plate in subsequent processes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the battery cell cover plate provided by this utility model.

[0022] Figure 2 This is a cross-sectional view of the battery cell cover plate provided by this utility model.

[0023] Figure 3 This is a schematic diagram showing the positional relationship between the positioning groove and the heat insulation component in the battery cell cover provided by this utility model.

[0024] Figure 4 This is a schematic diagram of the heat insulation component structure in the battery cell cover provided by this utility model.

[0025] Figure 5 This is a schematic diagram showing the positional relationship between the heat insulation component and the high-temperature resistant adhesive in the battery cell cover provided by this utility model.

[0026] Figure 6 yes Figure 2 An enlarged schematic diagram of part A shown in the middle circle.

[0027] Figure label:

[0028] 1. Cover plate body; 11. First through hole; 2. Lower plastic plate; 21. Second through hole; 22. Positioning groove; 221. Groove bottom; 222. Side wall; 223. Positioning protrusion; 3. Pole post; 31. Mounting plate; 311. First mounting part; 312. Second mounting part; 32. Connecting post; 4. Heat insulation component; 41. Base plate; 42. Side plate; 421. Positioning groove; 42a. First side plate; 42b. Second side plate; 42c. Connecting plate; 5. Upper plastic plate; 6. Riveting block; 7. Sealing ring; 8. High temperature resistant adhesive; 9. Gap. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In the description of the embodiments of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly identifying product components and do not represent any substantial difference. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances. Furthermore, "multiple" means two or more. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0031] The following is combined with Figures 1-6 This invention describes the cell cover plate and the cell.

[0032] like Figure 1 As shown, the battery cell cover provided in this embodiment includes a cover body 1, a lower plastic plate 2, an electrode post 3, and a heat insulation component 4. The cover body 1 has a first through hole 11. The lower plastic plate 2 is disposed on one side of the cover body 1 and has a second through hole 21. The electrode post 3 includes a mounting plate 31 and a connecting post 32. The mounting plate 31 is located on the side of the lower plastic plate 2 away from the cover body 1, and the connecting post 32 is connected to the mounting plate 31 and passes through the first through hole 11 and the second through hole 21. The heat insulation component 4 is disposed between the mounting plate 31 and the lower plastic plate 2.

[0033] The cover plate body 1 is typically a metal plate with a certain structural strength, such as an aluminum plate. The lower plastic plate 2 can be made of PP material. The heat insulation component 4 is a high-temperature resistant engineering plastic component, such as PC or LCP. It is understandable that the high-temperature performance of the heat insulation component 4 should be higher than that of the lower plastic plate 2.

[0034] In the cell structure, the lower plastic plate 2 is located on the side of the cover plate body 1 facing the electrode assembly, and the mounting plate 31 of the electrode post 3 is located on the side of the lower plastic plate 2 away from the cover plate body 1. The electrode tabs of the electrode assembly are welded to the mounting plate 31, so that the electrode tabs are electrically connected to the connecting post 32 through the mounting plate 31.

[0035] See Figure 1 and Figure 2 The connecting post 32 passes sequentially through the second through hole 21 of the lower plastic plate 2 and the first through hole 11 of the cover plate body 1. An upper plastic plate 5 and a riveting block 6 are provided on the side of the cover plate body 1 away from the lower plastic plate 2. The upper plastic plate 5 is located between the riveting block 6 and the cover plate body 1 to isolate them. The top end of the connecting post 32 is riveted to the riveting block 6. The battery cell structure also includes a sealing ring 7, which is located within the first through hole 11 and the second through hole 21. The connecting post 32 passes through the sealing ring 7 to achieve sealing and insulation between the connecting post 32 and the cover plate body 1.

[0036] The battery cell cover provided in this embodiment of the utility model can reduce the heat conducted from the electrode 3 to the lower plastic plate 2 during the welding process by setting a heat insulation component 4 between the lower plastic plate 2 and the electrode 3. This avoids the insulation failure between the electrode 3 and the aluminum plate caused by the melting of the lower plastic plate 2, and can also ensure the normal hot-melt assembly of the inner insulating film of the battery cell with the lower plastic plate in subsequent processes.

[0037] like Figure 3As shown in this embodiment of the invention, a positioning groove 22 is provided on the side of the lower plastic plate 2 away from the cover plate body 1. The shape of the positioning groove 22 is adapted to the shape of the mounting plate 31. The mounting plate 31 and the heat insulation member 4 are disposed in the positioning groove 22.

[0038] The shape of the positioning groove 22 is adapted to the shape of the mounting plate 31, facilitating the installation and positioning of the mounting plate 31 and the lower plastic plate 2. A second through hole 21 is provided within the positioning groove 22, and a heat insulation component 4 can be installed within the positioning groove 22 at a position outside the second through hole 21. Optionally, the positioning groove 22 is a rectangular groove, with one corner chamfered to prevent incorrect installation of the pole post 3 and the lower plastic plate 2.

[0039] In some embodiments of this utility model, the heat insulation component 4 is a flat plate and is disposed between the bottom 221 of the mounting plate 31 and the positioning groove 22, mainly used for heat insulation between the lower plastic plate 2 and the surface of the mounting plate 31.

[0040] In other embodiments of this utility model, such as Figure 4 As shown, the heat insulation component 4 includes a connected base plate 41 and a side plate 42. The base plate 41 is located between the mounting plate 31 and the bottom 221 of the positioning groove 22, and the side plate 42 is located between the mounting plate 31 and the side wall 222 of the positioning groove 22.

[0041] The base plate 41 is used for heat insulation between the lower plastic plate 2 and the mounting plate 31, and the side plate 42 is used for heat insulation between the lower plastic plate 2 and the sides of the mounting plate 31, thereby improving the heat insulation effect between the mounting plate 31 and the lower plastic plate 2.

[0042] Optionally, the side plate 42 extends along the side edge of the mounting plate 31, such that the side plate 42 and the bottom plate 41 form a receiving groove, in which at least a portion of the mounting plate 31 is received. It is understood that the side plate 42 is conformally configured with the side wall 222 of the positioning groove 22 and the side edge of the mounting plate 31.

[0043] Specifically, the side plate 42 includes a first side plate 42a, a second side plate 42b, and a connecting plate 42c. The first side plate 42a and the second side plate 42b are disposed opposite to each other, and the connecting plate 42c connects the first side plate 42a and the second side plate 42b to form a U-shaped side plate 42. The connecting plate 42c is located on the side of the second mounting portion 312 away from the first mounting portion 311.

[0044] like Figure 6 As shown, in some embodiments of this utility model, the end of the side plate 42 away from the bottom of the groove 221 is lower than the opening of the positioning groove 22, and the height difference between the end of the side plate 42 away from the bottom of the groove 221 and the opening of the groove is h, 0.2≤h≤0.3mm.

[0045] Understandably, the dimension of the side plate 42 in the depth direction of the positioning groove 22 is 0.2~0.3mm smaller than the depth of the positioning groove 22. For example, 0.2mm, 0.25mm or 0.3mm. This ensures that the assembled heat insulation component 4 does not affect the riveting fixture of the cover plate.

[0046] In this embodiment of the invention, the thickness of the base plate 41 is greater than the thickness of the side plate 42. When the mounting plate 31 is welded to the electrode lug, the heat conducted from the surface of the mounting plate 31 to the base plate 41 is greater than the heat conducted from its side to the side plate 42. By providing a thicker base plate 41, the heat insulation effect between the surface of the mounting plate 31 and the lower plastic plate 2 can be improved. While ensuring adequate heat insulation between the side of the mounting plate 31 and the lower plastic plate 2, providing a thinner side plate 42 can reduce the weight and material usage of the heat insulation component 4, thereby lowering costs.

[0047] Optionally, such as Figure 6 As shown, the thickness of the base plate 41 is t1, 0.3mm ≤ t1 ≤ 0.6mm; and / or, the thickness of the side plate 42 is t2, 0.2mm ≤ t2 ≤ 0.4mm. For example, the thickness of the base plate 41 is 0.3mm, 0.4mm, 0.5mm, and 0.6mm. The thickness of the side plate 42 is 0.2mm, 0.3mm, and 0.4mm.

[0048] When the thickness of the base plate 41 is less than 0.3mm, the heat insulation effect between the surface of the mounting plate 31 and the lower plastic plate 2 is poor, and the bottom 221 of the positioning groove 22 is prone to melting; when the thickness of the base plate 41 is greater than 0.6mm, the heat insulation effect between the surface of the mounting plate 31 and the lower plastic plate 2 meets the requirements.

[0049] When the thickness of the side plate 42 is less than 0.2mm, the heat insulation effect between the side of the mounting plate 31 and the lower plastic plate 2 is poor, and the side wall 222 of the positioning groove 22 is prone to melting; when the thickness of the side plate 42 is greater than 0.4mm, the heat insulation effect between the side of the mounting plate 31 and the lower plastic plate 2 meets the requirements.

[0050] In one embodiment, 0.3mm≤t1≤0.6mm and 0.2mm≤t2≤0.4mm can ensure that the surface and sides of the mounting plate 31 and the lower plastic plate 2 have good heat insulation effects.

[0051] Furthermore, such as Figure 3 and Figure 4 As shown, one of the sidewall 222 and the side plate 42 of the positioning groove 22 is provided with a positioning protrusion 223, and the other is provided with a positioning groove 421. The positioning protrusion 223 and the positioning groove 421 are positioned and engaged.

[0052] Specifically, the side wall 222 of the positioning groove 22 is provided with a positioning protrusion 223, and the side plate 42 is provided with a positioning groove 421; or, the side wall 222 of the positioning groove 22 is provided with a positioning groove 421, and the side plate 42 is provided with a positioning protrusion 223. When the heat insulation component 4 is installed in the positioning groove 421, the positioning of the heat insulation component 4 relative to the lower plastic plate 2 is achieved through the cooperation of the positioning protrusion 223 and the positioning groove 421, preventing the heat insulation component 4 from shifting during the riveting process of the cell cover plate, which would cause the protection of the lower plastic plate 2 to fail.

[0053] Optionally, positioning protrusions 223 are provided on both opposite sidewalls 222 of the positioning groove 22. Correspondingly, positioning grooves 421 are provided on opposite sides of the heat insulation member 4. Specifically, the first side plate 42a and the second side plate 42b of the heat insulation member 4 are respectively provided with positioning grooves 421, and the two positioning grooves 421 are arranged opposite to each other.

[0054] In some embodiments of this utility model, the mounting plate 31 includes a first mounting portion 311 and a second mounting portion 312 connected together. A connecting post 32 is connected to the first mounting portion 311, and a heat insulation member 4 is disposed between the second mounting portion 312 and the lower plastic plate 2. The second mounting portion 312 is used for welding to the electrode tab.

[0055] Specifically, the first mounting portion 311 and the second mounting portion 312 are distributed along the length of the lower plastic plate 2. The first mounting portion 311 is provided with a first conductive portion connected to the connecting post 32, and the second mounting portion 312 is provided with a second conductive portion connected to the electrode tab. The first conductive portion and the second conductive portion are connected. During the electrode tab welding process, the heat is mainly concentrated in the second mounting portion 312. The heat insulation component 4 is disposed between the second mounting portion 312 and the lower plastic plate 2, which simplifies the structure of the heat insulation component 4.

[0056] Furthermore, a fusible link is connected between the first mounting part 311 and the second mounting part 312. The fusible link can melt at a certain temperature to cut off the first conductive part and the second conductive part, thereby achieving high-temperature protection for the battery cell.

[0057] Furthermore, such as Figure 2 As shown, there is a gap 9 between the first mounting part 311 and the lower plastic plate 2 in the thickness direction of the lower plastic plate 2. Specifically, the mounting part is disposed in the positioning groove 22 of the lower plastic plate 2, and there is a gap 9 between the first mounting part 311 and the bottom 221 of the positioning groove 22.

[0058] Understandably, the mounting plate 31 has a first mounting surface on the side facing the lower plastic plate 2, and the lower plastic plate 2 has a second mounting surface on the side facing the mounting plate 31. Specifically, the second mounting surface is the bottom surface of the positioning groove 22. The first and second mounting surfaces are positioned opposite each other. The heat insulation component 4 is disposed between the first and second mounting surfaces and supported between the second mounting part 312 and the lower plastic plate 2, creating a gap 9 between the first mounting part 311 and the lower plastic plate 2. The presence of this gap 9 reduces the heat conducted to the lower plastic plate 2 through the first mounting part 311.

[0059] In this embodiment of the utility model, the heat insulation component 4 is bonded, fused, or snapped to the lower plastic plate 2.

[0060] Optionally, the heat insulation component 4 is bonded to the lower plastic sheet 2 using a high-temperature resistant adhesive 8. This high-temperature resistant adhesive 8 can be glue or tape. Figure 5 As shown, the high-temperature resistant adhesive 8 is disposed in the central area of ​​the heat insulation component 4. Alternatively, the heat insulation component 4 and the lower plastic sheet 2 are fused together using a hot-melt process. Alternatively, the heat insulation component 4 and the lower plastic sheet 2 are snapped together using a snap-fit ​​structure.

[0061] Optionally, the heat insulation component 4 has a buckle on the side facing the lower plastic plate 2, and the lower plastic plate 2 has a slot on the side facing the heat insulation component 4, with the buckle engaging in the slot. When installing the heat insulation component 4, pressing is used to engage the heat insulation component 4 with the lower plastic plate 2.

[0062] Optionally, the heat insulation component 4 is provided with a slot, and the lower plastic plate 2 is provided with a snap-fit ​​protrusion. The snap-fit ​​protrusion is engaged in the slot to achieve the snap-fit ​​between the heat insulation component 4 and the lower plastic plate 2. The slot can be provided on the side plate 42, and the snap-fit ​​protrusion is correspondingly provided on the side wall 222 of the positioning groove 22. Optionally, in the above embodiment, the positioning groove 421 serves as the slot, and the positioning protrusion 223 serves as the snap-fit ​​protrusion. The positioning protrusion 223 and the positioning groove 421 achieve the snap-fit ​​through an interference fit.

[0063] This utility model embodiment also provides a battery cell, including: a housing, an electrode assembly, and a battery cell cover plate as described in any of the above embodiments. The housing has an opening, the battery cell cover plate is disposed in the opening, the battery cell cover plate and the housing surround to form a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the electrode tabs of the electrode assembly are connected to a mounting plate.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body is provided with a first through hole; The lower plastic plate is disposed on one side of the cover plate body and has a second through hole; The pole includes a mounting plate and a connecting post. The mounting plate is located on the side of the lower plastic plate away from the cover plate body. The connecting post is connected to the mounting plate and passes through the first through hole and the second through hole. A heat insulation component is disposed between the mounting plate and the lower plastic plate.

2. The cell cover plate according to claim 1, characterized in that, The lower plastic plate has a positioning groove on the side away from the cover plate body. The shape of the positioning groove is adapted to the shape of the mounting plate. The mounting plate and the heat insulation component are located in the positioning groove.

3. The cell cover plate according to claim 2, characterized in that, The heat insulation component includes a connected base plate and a side plate. The base plate is located between the mounting plate and the bottom of the positioning groove, and the side plate is located between the mounting plate and the side wall of the positioning groove.

4. The cell cover plate according to claim 3, characterized in that, The end of the side plate away from the bottom of the groove is lower than the opening of the positioning groove, and the height difference between the end of the side plate away from the bottom of the groove and the opening of the groove is h, 0.2≤h≤0.3mm.

5. The cell cover plate according to claim 3, characterized in that, The thickness of the base plate is t1, 0.3mm≤t1≤0.6mm; and / or, the thickness of the side plate is t2, 0.2mm≤t2≤0.4mm.

6. The cell cover plate according to claim 3, characterized in that, One of the sidewalls of the positioning groove and the side plate is provided with a positioning protrusion, and the other is provided with a positioning groove, wherein the positioning protrusion and the positioning groove are positioned and engaged.

7. The cell cover plate according to claim 1, characterized in that, The mounting plate includes a first mounting part and a second mounting part connected together. The connecting post is connected to the first mounting part. The heat insulation element is disposed between the second mounting part and the lower plastic plate. The second mounting part is used for welding to the electrode tab.

8. The cell cover plate according to claim 7, characterized in that, There is a gap between the first mounting part and the lower plastic plate in the thickness direction of the lower plastic plate.

9. The cell cover plate according to claim 1, characterized in that, The heat insulation component is bonded, fused, or snapped to the lower plastic sheet.

10. A battery cell, characterized in that, include: The battery includes a housing, an electrode assembly, and a cell cover plate as described in any one of claims 1-9, wherein the housing has an opening, the cell cover plate is disposed in the opening, the cell cover plate and the housing surround to form a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the electrode tabs of the electrode assembly are connected to the mounting plate.

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