Cover plate, cover plate assembly, battery case, battery module, and battery pack

Abstract

A cover plate (1), a cover plate assembly (2), a battery case (3), a battery module (4), and a battery pack. The cover plate (1) comprises a body portion (10) and a first boss (11); the body portion (10) has a thickness of D1, wherein 0.8 mm≤D1≤1.5 mm; the first boss (11) protrudes from one side of the body portion (10); a through-going liquid injection hole (110) is provided at the position of the first boss (11) corresponding to a through hole (200); the other side of the body portion (10) is provided with a first recess (12); the first recess (12) corresponds to the first boss (11); the cover plate (1) has a thickness of D2 at the first boss (11), wherein 0.8 mm≤D2≤1.5 mm. The cover plate (1) can meet the usage requirement of structural strength.

Description

Cover plate, cover plate assembly, battery housing, battery module and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 15, 2023, with application number 202321530873.4. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a cover plate, a cover plate assembly, a battery housing, a battery module and a battery pack. Background Art

[0003] With the rapid development of new energy, battery modules have been used more and more widely. At the same time, there is a demand for lighter battery modules.

[0004] In the related art, in order to ensure that the structural strength of the cover plate of the battery module meets the use requirements, the cover plate is often made of an aluminum plate with a thickness of at least 2 mm. SUMMARY OF THE INVENTION

[0005] In the related art, the cover plate is often made of aluminum plate with a thickness of at least 2mm. This makes the cover plate heavy and not conducive to the lightweight requirements of the battery module. If the cover plate thickness is less than 2mm, although the weight of the cover plate can be further reduced, the structural strength of the cover plate cannot meet the use requirements.

[0006] In a first aspect, an embodiment of the present application provides a cover plate for use in a cover plate assembly, wherein the cover plate assembly includes an insulating plate and a sealing structure, wherein the insulating plate is provided with a through hole, and the cover plate includes:

[0007] a main body, one side of which is used to connect to the insulating plate, the main body having a thickness D1, 0.8 mm ≤ D1 ≤ 1.5 mm; and

[0008] a first boss, the first boss being protrudingly provided on a side of the main body facing away from the insulating plate, and the first boss being provided with a through injection hole corresponding to the through hole;

[0009] The main body has a setting surface facing the insulating plate, the setting surface is provided with a first recess, and the first recess corresponds to the first boss;

[0010] The cover plate has a thickness D2 at the first boss, and 0.8 mm ≤ D2 ≤ 1.5 mm.

[0011] In the second aspect, an embodiment of the present application provides a cover plate assembly, comprising an insulating plate and a sealing structure, wherein the insulating plate is provided with a through hole, and the cover plate assembly further comprises: the cover plate as described in the first aspect above, wherein the side of the main body portion provided with the first recess is connected to the insulating plate, the through hole corresponds to the liquid injection hole, the sealing structure seals the liquid injection hole, and the sealing structure is partially provided through the through hole.

[0012] In a third aspect, an embodiment of the present application provides a battery housing for a battery module, the battery housing comprising: a shell body having an opening on one side of the shell body; and a cover plate assembly as described in the second aspect above, the cover plate covering the opening, the insulating plate being at least partially located inside the shell body.

[0013] In a fourth aspect, an embodiment of the present application provides a battery module, comprising a core pack, the battery module further comprising a battery shell as described in the third aspect above, the core pack being arranged inside the shell body.

[0014] In the fifth aspect, an embodiment of the present application provides a battery pack, comprising a case body, and a plurality of batteries arranged inside the case body, each of the batteries comprising a core pack and a battery shell, the core pack being arranged inside the battery shell, and the battery shell comprising the battery shell as described in the third aspect. Beneficial effects

[0015] The cover plate provided by the present application is provided with a first boss on one side of the main body and a first recess corresponding to the first boss on the other side of the main body, so that the cover plate forms a ring-shaped local thickening structure protruding along the protruding direction of the first boss between the outer periphery of the first boss and the side wall of the first recess, thereby making the overall structural strength of the cover plate greater than that of a flat plate structure with the same thickness. Therefore, the thickness of the cover plate can be thinned at all locations, so that the thickness of the main body and the cover plate at the first boss is less than or equal to 1.5 mm, thereby achieving a more lightweight design of the cover plate. Furthermore, since the injection hole is opened on the first boss, the first boss can also be used to make the injection hole further away from the insulating plate, so as to avoid the situation where the injection hole is closer to the insulating plate due to the thinning design at various locations of the cover plate, thereby avoiding the interference of the sealing structure used to seal the injection hole with the battery cells inside the battery module.

[0016] The cover plate assembly provided in this application is designed based on the above-mentioned cover plate. Its beneficial effects can be found in the beneficial effects of the above-mentioned cover plate, which will not be described in detail here.

[0017] The battery housing provided in the present application is designed based on the above-mentioned cover plate assembly. Its beneficial effects can be found in the beneficial effects of the above-mentioned cover plate assembly, which will not be described in detail here.

[0018] The battery module provided in this application is designed based on the above-mentioned battery housing. Its beneficial effects can be found in the beneficial effects of the above-mentioned battery housing, which will not be described in detail here.

[0019] The battery pack provided in this application is designed based on the above-mentioned battery housing. Its beneficial effects can be found in the beneficial effects of the above-mentioned battery housing, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the three-dimensional structure of the cover plate according to the embodiment;

[0021] FIG2 is a schematic diagram of the three-dimensional structure of the cover plate assembly according to the embodiment;

[0022] FIG3 is a schematic top view of the cover plate assembly according to the embodiment;

[0023] FIG4 is a schematic diagram of the structural decomposition of the cover plate assembly according to the embodiment;

[0024] FIG5 is a cross-sectional view taken along line AA in FIG3 .

[0025] FIG6 is an enlarged view of point M in FIG5 ;

[0026] FIG7 is an exploded schematic diagram of a partial structure of the cover plate assembly according to the embodiment;

[0027] FIG8 is a schematic diagram of the three-dimensional structure of the battery module according to the embodiment;

[0028] FIG9 is a schematic diagram of the structural decomposition of the battery module according to the embodiment;

[0029] Figure Number:

[0030] 1. Cover plate; 10. Main body; 100. Installation surface; 11. First boss; 110. Liquid injection hole; 110a. First sub-hole; 110b. Second sub-hole; 111. Second boss; 12. First recess; 120. Second recess;

[0031] 2. Cover plate assembly; 20. Insulation plate; 200. Through hole; 21. Sealing structure; 210. Sealing pin; 211. Sealing cover;

[0032] 3. Battery housing; 30. Shell body; 300. Opening;

[0033] 4. Battery module; 40. Core pack. Modes for Carrying Out the Invention

[0034] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] As shown in FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the present application provides a cover plate 1 for a cover plate assembly 2 . The cover plate assembly 2 includes an insulating plate 20 . The insulating plate 20 is provided with a through hole 200 .

[0037] As shown in Figures 4, 5, and 6, the cover plate 1 includes a main body 10 and a first boss 11. One side of the main body 10 is used to connect to the insulating plate 20. The main body 10 has a thickness D1, 0.8 mm ≤ D1 ≤ 1.5 mm. The first boss 11 is provided on the side of the main body 10 facing away from the insulating plate 20. A through-hole 110 is provided on the first boss 11 corresponding to the through-hole 200. The main body 10 has a mounting surface 100 facing the insulating plate 20. The mounting surface 100 is provided with a first recess 12, which corresponds to the first recess 12. The cover plate 1 has a thickness D2 at the first boss 11, 0.8 mm ≤ D2 ≤ 1.5 mm.

[0038] It should be noted that the "thickness D2 of the cover plate 1 at the first boss 11" specifically refers to the local structural thickness of the cover plate 1 at the first boss 11, which is formed by the first boss 11 and the first recess 12, and does not refer to the distance between the top of the first boss 11 and the setting surface 100.

[0039] By protruding a first boss 11 on one side of the main body 10 and providing a first recess 12 corresponding to the first boss 11 on the other side of the main body 10, a ring-shaped local thickening structure protruding along the protruding direction of the first boss 11 is formed between the outer periphery of the first boss 11 and the side wall of the first recess 12 of the cover plate 1, so that the overall structural strength of the cover plate 1 is greater than that of a flat plate structure with the same thickness. Therefore, the thickness of the cover plate 1 at various locations can be thinned so that the thickness of the main body 10 and the cover plate 1 at the first boss 11 is less than or equal to 1.5 mm, thereby achieving a more lightweight design of the cover plate 1.

[0040] Furthermore, since the injection hole 110 is opened on the first boss 11, the first boss 11 can also be used to make the injection hole 110 further away from the insulating plate 20, so as to avoid the situation where the injection hole 110 is closer to the insulating plate 20 due to the thinning design at various places of the cover plate 1, thereby avoiding the sealing structure 21 used to seal the injection hole 110 from interfering with the battery cells inside the battery module.

[0041] For example, by protruding a first boss 11 on one side of the main body 10, the cover plate 1 can realize, for example, a thickness D1 of the main body 10 of 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, and the cover plate 1 can realize, for example, a thickness D2 at the first boss 11 of 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0042] In order to ensure that the structure of the first boss 11 and the main body 10 can enhance the overall structural strength of the cover 1 and meet the design and use requirements, the first boss 11 needs to protrude from the main body 10 by a certain height, but not too much. Based on this, optionally, the protruding height of the first boss 11 from the main body 10 is A, and the height A can satisfy: 0.1D1≤A≤2D1. For example, the height A can be: 0.1D1, 0.2D1, 0.5D1, 0.6D1, 0.8D1, 1D1, 1.2D1, 1.5D1, 1.6D1, 1.8D1 or 2D1, etc.

[0043] Preferably, the first boss 11 and the first recess 12 can be formed on the main body 10 by stamping, so that the manufacturing process of the first boss 11 and the first recess 12 is simple.

[0044] In order to further alleviate the problem that the setting space of the sealing structure 21 of the injection hole 110 moves inwardly into the battery module due to the overall thinning design of the cover plate 1, causing the end of the sealing structure 21 to easily interfere with the battery cell, thereby posing a safety hazard, the cover plate 1 may optionally further include a second boss 111 and a second recess 120, the second boss 111 being convexly arranged on the first boss 11, the second recess 120 corresponding to the second boss 111 being arranged at the bottom of the first recess 12, the injection hole 110 being opened at the second boss 111, and the cover plate 1 The second boss 111 has a thickness D3, 0.8mm≤D3≤1.5mm. For example, the thickness D3 can be: 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc., so that the injection hole 110 is located further away from the insulating plate 20, so that the setting space of the sealing structure 21 is further moved to the outside of the battery module, so as to further alleviate the problem that the sealing structure 21 is prone to interfere with the battery cell, thereby improving the overall safety of the battery module.

[0045] It should be noted that the "thickness D3 of the cover plate 1 at the second boss 111" specifically refers to the local structural thickness of the cover plate 1 at the second boss 111, which is formed by the second boss 111 and the second recess 120, and does not refer to the distance between the top of the second boss 111 and the setting surface 100.

[0046] Preferably, the second boss 111 and the second recess 120 can be formed on the first boss 11 and the first recess 12 by stamping, so that the manufacturing process of the second boss 111 and the second recess 120 is simple.

[0047] The protruding height of the second boss 111 from the first boss 11 is B. The larger the height B, the farther the injection hole 110 is from the insulating plate 20, but the worse the structural stability of the second boss 111. The smaller the height B, the closer the injection hole 110 is to the insulating plate 20, but the better the structural stability of the second boss 111. Therefore, the height B cannot be too large or too small. Based on this, optionally, the protruding height B of the second boss 111 from the first boss 11 may satisfy: 0.1D2≤B≤2D2. For example, the height B may be: 0.1D2, 0.2D2, 0.5D2, 0.6D2, 0.8D2, 1D2, 1.2D2, 1.5D2, 1.6D2, 1.8D2 or 2D2, etc.

[0048] Preferably, the surface of the cover plate 1 provided with the liquid injection hole 110 protrudes from the main body 10 by a height C, that is, the total protrusion height of the second boss 111 protruding from the main body 10 is C, the insulating plate 20 has a thickness E, and the sealing structure 21 has a dimension F along the thickness direction of the cover plate 1. The thickness D1, height C, thickness E and dimension F can satisfy: -1mm≤D1+C+EF≤0.1mm, for example, D1+C+EF can be: -1mm, -0.9mm, -0.8mm, -0.7mm, -0.6mm, -0.5mm, -0.4mm, -0.3mm, -0.2mm, -0.1mm, 0mm or 0.1mm, etc., wherein the units of thickness D1, height C, thickness E and dimension F are all mm, so that the end of the sealing structure 21 away from the injection hole 110 is located in the through hole 200, or the height of the end of the sealing structure 21 away from the injection hole 110 protruding from the insulating plate 20 is less than or equal to 1mm, and the possibility of interference between the sealing structure 21 and the battery cell is small. Therefore, the overall safety of the battery module is better.

[0049] Among them, the insulating plate 20 usually adopts a structure with a thickness E of about 0.7 mm. For example, the thickness E of the insulating plate 20 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, etc. Taking the thickness E of the insulating plate 20 as 0.7 mm as an example, at this time, the thickness D1, height C and dimension F can satisfy: -1.7 mm ≤ D1 + CF ≤ -0.6 mm.

[0050] It can be understood that the height C is the sum of the protruding height A of the first boss 11 protruding from the main body 10 and the protruding height B of the second boss 111 protruding from the first boss 11 , that is, C=A+B.

[0051] As shown in Figures 4, 6 and 7, optionally, the injection hole 110 may include a first sub-hole 110a and a second sub-hole 110b that are connected to each other. The first sub-hole 110a is opened in the second recess 120, and the second sub-hole 110b is opened in the second boss 111. The aperture of the first sub-hole 110a is smaller than the aperture of the second sub-hole 110b. The sealing structure 21 may include a sealing pin 210 and a sealing cover 211. The sealing pin 210 is sealed and blocked in the first sub-hole 110a, and the top end of the sealing pin 210 is penetrated into the through hole 200. The sealing cover 211 covers the second sub-hole 110b, so that the injection hole 110 can be sealed for the second time, so that the sealing effect of the sealing structure 21 on the injection hole 110 is better.

[0052] It can be understood that the dimension F of the aforementioned sealing structure 21 may be the overall dimension of the sealing cover 211 and the sealing pin 210 along the thickness direction of the cover plate 1 .

[0053] Please refer to Figure 3 again. The main body 10 can be arranged around the first boss 11, that is, the main body 10 can be formed into a runway-type structure surrounding the first boss 11, and the main body 10 has a width t. Since the cover plate 1 is usually welded to the shell body of the battery shell by welding, the width t needs to have a certain size to provide a sufficient welding area. Based on this, optionally, the width t of the main body 10 can satisfy: t≥1mm, for example, the width t can be: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc.

[0054] As shown in Figures 2, 3, and 4, the present application provides a cover plate assembly 2, comprising an insulating plate 20 and a sealing structure 21. The insulating plate 20 is provided with a through hole 200. The cover plate assembly 2 further comprises: the cover plate 1 provided in the aforementioned solution, wherein the side of the body portion 10 provided with the first recess 12 is connected to the insulating plate 20, the through hole 200 corresponds to the liquid injection hole 110, the sealing structure 21 seals the liquid injection hole 110, and the sealing structure 21 is partially provided through the through hole 200. By providing the cover plate 1 provided in the aforementioned solution, the cover plate assembly 2 as a whole can achieve a more lightweight design.

[0055] As shown in FIG8 and FIG9 , the present application provides a battery module 4 , including a core pack 40 and a battery housing 3 . The core pack 40 is disposed inside a shell body 30 of the battery housing 3 .

[0056] Specifically, the battery housing 3 includes a housing body 30 and a cover assembly 2 as provided in the above technical solution. One side of the housing body 30 has an opening 300 , the cover 1 covers the opening 300 , and the insulating plate 20 is at least partially located inside the housing body 30 .

[0057] Since the cover plate assembly 2 provided by the aforementioned technical solution can achieve a more lightweight design, it is beneficial for the battery housing 3 and the battery module 4 including the battery housing 3 to meet the demand for a more lightweight design.

[0058] Optionally, the shell body 30 may be at least partially made of plastic material, for example, the shell body 30 may be made of plastic material as a whole, or the shell body 30 may be partially made of metal material and the remaining part may be made of plastic material, so as to reduce the weight of the shell body 30 and enable the battery shell 3 and the battery module 4 to achieve a further lightweight design.

[0059] The present application provides a battery pack, which includes a box body and a plurality of batteries arranged inside the box body. Each battery includes a core pack 40 and a battery shell 3. The core pack 40 is arranged inside the battery shell 3.

[0060] Specifically, the battery housing 3 includes a housing body 30 and a cover assembly 2 as provided in the above technical solution. One side of the housing body 30 has an opening 300 , the cover 1 covers the opening 300 , and the insulating plate 20 is at least partially located inside the housing body 30 .

[0061] Since the cover plate assembly 2 provided by the aforementioned technical solution can achieve a more lightweight design, it is beneficial for the battery housing 3 and the battery pack including the battery housing 3 to meet the demand for a more lightweight design.

[0062] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0063] Throughout this specification, references to terms such as "an embodiment" or "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0064] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A cover plate (1) for a cover plate assembly (2), the cover plate assembly (2) comprising an insulating plate (20), the insulating plate (20) being provided with a through hole (200), the cover plate (1) comprising: A main body (10), one side of the main body (10) being used for connecting the insulating plate (20), the main body (10) having a thickness D1, 0.8 mm ≤ D1 ≤ 1.5 mm; and a first boss (11), the first boss (11) being protrudingly arranged on a side of the main body (10) facing away from the insulating plate (20), the first boss (11) being provided with a through injection hole (110) corresponding to the through hole (200); The main body (10) has a setting surface (100) facing the insulating plate (20), the setting surface (100) being provided with a first recess (12), the first recess (12) corresponding to the first boss (11); The cover plate (1) has a thickness D2 at the first boss (11), 0.8 mm ≤ D2 ≤ 1.5 mm.

2. The cover plate (1) according to claim 1, wherein: The protrusion height of the first boss (11) from the main body (10) is A, and 0.1D1≤A≤2D1.

3. The cover plate (1) according to claim 1, wherein: The cover plate (1) further comprises a second boss (111) and a second recess (120), wherein the second boss (111) is convexly disposed on the first boss (11), and the second recess (120) is disposed at the bottom of the first recess (12) corresponding to the second boss (111), the injection hole (110) is disposed at the second boss (111), and the cover plate (1) has a thickness D3 at the second boss (111), and 0.8 mm ≤ D3 ≤ 1.5 mm.

4. The cover plate (1) according to claim 3, wherein: The protrusion height of the second boss (111) from the first boss (11) is B, and 0.1D2≤B≤2D2.

5. The cover plate (1) according to any one of claims 1 to 4, wherein: The main body (10) is arranged around the first boss (11), and the main body (10) has a width t, where t≥1 mm.

6. The cover plate (1) according to claim 3, wherein: The first boss (11) and the first recess (12) are formed on the main body (10) by stamping, the second boss (111) is formed on the first boss (11) by stamping, and the second recess (120) is formed on the first recess (12) by stamping.

7. A cover plate assembly (2), comprising an insulating plate (20) and a sealing structure (21), wherein the insulating plate (20) is provided with a through hole (200), and the cover plate assembly (2) further comprises: According to the cover plate (1) according to any one of claims 1 to 6, a side of the main body (10) provided with the first recess (12) is connected to the insulating plate (20), the through hole (200) corresponds to the liquid injection hole (110), the sealing structure (21) seals the liquid injection hole (110), and the sealing structure (21) is partially penetrated through the through hole (200).

8. The cover plate assembly (2) according to claim 7, wherein: The surface of the cover plate (1) provided with the injection hole (110) protrudes from the main body (10) by a protruding height C, the insulating plate (20) has a thickness E, and along the thickness direction of the cover plate (1), the sealing structure (21) has a dimension F, -1mm≤D1+C+EF≤0.1mm.

9. The cover plate assembly (2) according to claim 7, wherein: The surface of the cover plate (1) provided with the injection hole (110) protrudes from the main body (10) by a height C, the first boss (11) of the cover plate (1) protrudes from the main body (10) by a height A, and the second boss (111) of the cover plate (1) protrudes from the first boss (11) by a height B, where C=A+B.

10. The cover plate assembly (2) according to claim 8, wherein: The thickness E of the insulating plate (20) satisfies: 0.5 mm ≤ E ≤ 1.2 mm.

11. A battery housing (3) for a battery module (4), the battery housing (3) comprising: A shell body (30), wherein one side of the shell body (30) has an opening (300); as well as, The cover plate assembly (2) according to claim 7, wherein the cover plate (1) covers the opening (300), and the insulating plate (20) is at least partially located inside the shell body (30).

12. The battery casing (3) according to claim 11, wherein the casing body (30) is at least partially made of plastic material.

13. A battery module (4), comprising a core pack (40), the battery module (4) further comprising a battery casing (3) according to claim 11 or 12, the core pack (40) being arranged inside the casing body (30).

14. A battery pack, comprising a box body, and a plurality of batteries arranged inside the box body, each of the batteries comprising a core pack (40) and a battery shell (3), the core pack (40) being arranged inside the battery shell (3), and the battery shell (3) comprising the battery shell (3) according to claim 11 or 12.

Images