Housing assembly of battery and battery

Abstract

The present application relates to a housing assembly of a battery and a battery. The housing assembly of a battery comprises a casing, an end cover, a sleeve, and an insulating plate. The casing has a bottom wall and a side wall, and the side wall comprises a main side portion and a bending portion. The end cover has a terminal portion and a ledge portion, the ledge portion being located between the bending portion and the bottom wall and being insulatingly connected to the side wall. The sleeve covers the exterior of the casing. The insulating plate comprises an inner side portion, an outer side portion arranged on the periphery of the inner side portion, and a connecting portion connected between the inner side portion and the outer side portion. The outer side portion is at least partially clamped between the sleeve and the bending portion. The inner side portion is provided with a through hole for the terminal portion to pass through. The inner side portion is arranged closer to the bottom wall than the outer side portion.

Description

Battery casing assembly and battery

[0001] This application claims priority to Chinese Patent Application No. 202422508795.9, filed on October 16, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery casing assembly and a battery. Background Technology

[0003] Battery labeling involves applying a special label or protective film (usually called a sleeve) to the battery casing during the manufacturing process. This enhances the appearance, protects the surface, displays brand and product information, and provides additional insulation to prevent short circuits. During the labeling process, the sleeve undergoes heating or cooling processes to shrink and fit snugly against the battery casing. To provide buffer space for thermal expansion and contraction, compensate for manufacturing tolerances, and release external stress, deformation gaps are provided between the sleeve and the terminals. These deformation gaps ensure that the sleeve can freely contract and deform during labeling, preventing breakage or poor deformation due to excessive tension. Invention Overview

[0004] However, if the deformation gaps are not properly treated, they will not only affect the appearance of the battery, but may also cause foreign objects to enter the battery, causing short circuits and affecting the insulation effect.

[0005] In a first aspect, this application provides a battery casing assembly, comprising:

[0006] A housing having a bottom wall and side walls, the side walls including a main side portion connected to the outer periphery of the bottom wall, and a curved portion extending from one end of the main side portion away from the bottom wall toward the central axis of the housing;

[0007] An end cap has a terminal portion and an eave portion connected to the outer periphery of the terminal portion, the eave portion being located on the side of the curved portion facing the bottom wall and being insulated from the side wall;

[0008] A sleeve, covering the outside of the housing; and,

[0009] An insulating plate includes an inner portion, an outer portion disposed around the periphery of the inner portion, and a connecting portion connecting the inner portion and the outer portion. The outer portion is at least partially sandwiched between the sleeve and the bent portion. The inner portion is provided with a through hole for passing through the terminal portion. The inner portion is disposed closer to the bottom wall than the outer portion.

[0010] Secondly, this application also provides a battery, comprising:

[0011] The battery casing assembly as described above; and,

[0012] The battery cell is housed within the casing. Beneficial effects

[0013] The battery casing assembly provided in this application, by having the terminal portion pass through a through hole in the inner part and at least partially sandwiched between the outer part and the sleeve and the bend, allows the insulating plate to cover the deformation gap reserved between the terminal portion and the sleeve, maintaining the clean appearance of the battery, preventing foreign objects from entering the gap, and avoiding short circuits. Furthermore, even if electrolyte leaks from between the eaves and sidewalls, the insulating plate can block it from the inside, suppressing electrolyte leakage to the outside and improving battery safety. Based on this, by setting the inner part closer to the bottom wall than the outer part, the insulating plate forms a spatial structure, increasing structural rigidity and reducing the possibility of deformation under stress. Even if the insulating plate tends to warp away from the bottom wall on the inner part due to sleeve contraction, the setting of the inner part closer to the bottom wall than the outer part can offset the adverse effects, preventing incomplete sleeve coverage of the insulating plate due to deformation, thereby improving the sleeve yield and ensuring the appearance and insulation effect of the battery. In other words, this insulating plate achieves multiple functions by inserting the terminal portion through the through hole on the inner side and clamping the outer side between the sleeve and the bent part, thus blocking deformation gaps, preventing foreign objects from entering, beautifying the appearance, improving insulation effect, and suppressing electrolyte leakage. Moreover, the inner side is set closer to the bottom wall than the outer side, which reduces the negative impact of deformation, improves the labeling yield, and ensures the stable implementation of various functions, thereby improving the battery production yield, appearance quality, safety, and reliability.

[0014] The battery provided in this application includes the aforementioned battery casing assembly. The insulating plate, by having the terminal portion pass through a through hole in the inner portion and clamping the outer portion between the sleeve and the bent portion, achieves multiple functions such as blocking deformation gaps, preventing foreign objects from entering, beautifying the appearance, improving insulation effect, and suppressing electrolyte leakage. Furthermore, the inner portion is positioned closer to the bottom wall than the outer portion, reducing the negative impact of deformation, improving the labeling yield, and ensuring the stable implementation of various functions, thereby improving the battery's production yield, appearance quality, safety, and reliability. Attached Figure Description

[0015] Figure 1 is a cross-sectional view of the first structural embodiment of the battery provided in this application;

[0016] Figure 2 is a schematic diagram of the structure of the battery end cap in Figure 1;

[0017] Figure 3 is a cross-sectional view of the second structural configuration of the battery provided in this application;

[0018] Figure 4 is a schematic diagram of the structure of the battery end cap in Figure 3;

[0019] Figure 5 is a cross-sectional view of the third structure of the battery provided in this application;

[0020] Figure 6 is a schematic diagram of the structure of the battery end cap in Figure 5;

[0021] Figure 7 is a top view of the structure of the insulating plate of the battery provided in this application;

[0022] Figure 8 is a cross-sectional view at point AA in Figure 7.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1000, Battery; 100, Housing Assembly; 1, Insulating Plate; 11, Inner Side; 111, Through Hole; 12, Connecting Part; 13, Outer Side; 2, Housing; 21, Bottom Wall; 22, Side Wall; 221, Main Side; 2211, Protrusion; 222, Bend; 3, End Cap; 31, Terminal Part; 32, Eaves; 4, Sleeve; 5, Insulating Sealing Ring; 51, Center Hole; 52, Slot; 6, Explosion-proof Sheet; 7, Perforated Plate; 8, Insulating Gasket; 200, Battery Cell. Embodiments of the present invention

[0025] This application provides a battery casing assembly and a battery. Please refer to Figures 1 and 2, or Figures 3 and 4, or Figures 5 and 6. Figures 1 to 8 are schematic diagrams of the battery structure provided in possible implementations of this application.

[0026] The housing assembly 100 of the battery 1000 includes a housing 2, an end cap 3, a sleeve 4, and an insulating plate 1.

[0027] The housing 2 has a bottom wall 21 and side walls 22. The side walls 22 include a main side portion 221 connected to the outer periphery of the bottom wall 21, and a curved portion 222 extending from one end of the main side portion 221 away from the bottom wall 21 toward the central axis of the housing 2. The housing 2 not only provides basic encapsulation and protection for the cell 200, but the curved portion 222 design also provides additional structural support and mounting positions. The electrode assembly of the cell 200 (including a positive electrode, a negative electrode, and a separator) undergoes an electrochemical reaction, and the housing 2 is electrically connected to either the positive or negative electrode to ensure current conduction.

[0028] The end cap 3 has a terminal portion 31 and an eave portion 32 connected to the outer periphery of the terminal portion 31. The eave portion 32 is located between the curved portion 222 and the bottom wall 21 and is insulated from the side wall 22. The terminal portion 31 on the end cap 3 is the electrical interface of the battery 1000 for connecting to external circuits, while the eave portion 32 is insulated from the side wall 22 to prevent short circuits.

[0029] Sleeve 4 covers the outside of housing 2. Sleeve 4, covering the outside of housing 2, not only enhances the appearance and feel of battery 1000, but also provides physical protection and additional insulation protection to prevent external damage.

[0030] Referring to Figures 7 and 8, the insulating plate 1 includes an inner portion 11, an outer portion 13 surrounding the inner portion 11, and a connecting portion 12 connecting the inner portion 11 and the outer portion 13. The outer portion 13 is at least partially sandwiched between the sleeve 4 and the bend 222. The inner portion 11 has a through hole 111 for the terminal portion 31 to pass through. The inner portion 11 is located closer to the bottom wall 21 than the outer portion 13 (i.e., in Figures 2, 4, or 6, the inner portion 11 is lower and the outer portion 13 is higher, with a height difference between them). The through hole 111 of the inner portion 11 allows the terminal portion 31 to pass through. The outer portion 13, sandwiched between the sleeve 4 and the bend 222, blocks deformation gaps, prevents foreign objects from entering, and effectively blocks electrolyte leakage, improving safety. The inner part 11 is closer to the bottom wall 21. This design reduces the adverse effects caused by the shrinkage of the sleeve 4, ensures the complete coverage of the sleeve 4, and improves the sleeve yield.

[0031] In the technical solution of this application, by inserting the terminal portion 31 through the through hole 111 of the inner portion 11 and at least partially clamping the outer portion 13 between the sleeve 4 and the bent portion 222, the insulating plate 1 can cover the deformation gap reserved between the terminal portion 31 and the sleeve 4, keeping the appearance of the battery 1000 clean, preventing foreign objects from entering the gap and avoiding short circuits. In addition, even if electrolyte leaks from between the eaves 32 and the side wall 22, the insulating plate 1 can block it on the inside, suppressing electrolyte leakage to the outside and improving the safety of the battery 1000. Based on this, by setting the inner side 11 closer to the bottom wall 21 relative to the outer side 13, the insulating plate 1 forms a spatial structure, which increases the structural rigidity and reduces the possibility of deformation under stress. Even if the insulating plate 1 tends to warp and deform away from the bottom wall 21 due to the shrinkage of the sleeve 4 (refer to Figure 2, Figure 4, or Figure 6 for understanding, the sleeve 4 is pressed on the upper side of the outer side 13, and the shrinkage of the sleeve 4 may cause the inner side 11 to deform and warp), the adverse effects can be offset by setting the inner side 11 closer to the bottom wall 21 relative to the outer side 13, avoiding the sleeve 4 from not fully covering the insulating plate 1 due to deformation, thereby improving the sleeve yield and ensuring the appearance and insulation effect of the battery 1000. That is, by inserting the terminal portion 31 through the through hole 111 of the inner portion 11 and clamping the outer portion 13 between the sleeve 4 and the bent portion 222, the insulating plate 1 achieves multiple functions such as blocking deformation gaps, preventing foreign objects from entering, beautifying the appearance, improving the insulation effect, and suppressing electrolyte leakage. Moreover, the inner portion 11 is set closer to the bottom wall 21 than the outer portion 13, which reduces the negative impact of deformation, improves the labeling yield, and ensures the stable realization of various functions, thereby improving the production yield, appearance quality, safety and reliability of the battery 1000.

[0032] Understandably, the inner part 11 is positioned closer to the bottom wall 21 than the outer part 13, meaning that the connecting part 12 is bent and connected between the inner part 11 and the outer part 13, and can be a right-angle connection.

[0033] In some possible implementations, as shown in Figure 8, the connecting portion 12 is inclined, and in the radial direction (X direction in Figure 8) of the through hole 111, the inner periphery of the connecting portion 12 is closer to the through hole 111 than the outer periphery of the connecting portion 12. In these possible implementations, this inclined design of the connecting portion 12 forms an obtuse-angle connection, providing additional lateral support, enhancing the structural rigidity of the insulation plate 1, effectively dispersing stress, reducing deformation under stress, further reducing the negative impact of deformation, improving the yield rate of the sealing, and ensuring the stable implementation of various functions.

[0034] Understandably, there are multiple ways to achieve an insulating connection between the eaves 32 and the side wall 22. For example, an insulating material can be coated on the contact surface of the eaves 32 and / or the side wall 22 to form an insulating layer.

[0035] In some possible implementations, as shown in Figures 2, 4, or 6, the housing assembly 100 of the battery 1000 also includes an insulating sealing ring 5. The insulating sealing ring 5 has a central hole 51, its inner periphery is sealed to the eaves 32, and its outer periphery is sealed to the sidewall 22. In these possible implementations, the insulating sealing ring 5 not only provides electrical insulation but also has good sealing performance, preventing electrolyte leakage. Furthermore, as an independent sealing element, the insulating sealing ring 5 can simplify the assembly process and improve production efficiency. Specifically, the insulating sealing ring 5 is made of high-performance insulating materials, such as specific types of rubber or synthetic materials.

[0036] In some possible implementations, as shown in Figures 2, 4, or 6, a protrusion 2211 is provided on the inner side of the main side portion 221. The protrusion 2211 and the curved portion 222 are spaced apart to define a mounting groove, in which the outer periphery of the insulating sealing ring 5 is inserted. In these possible implementations, the mounting groove provides conditions for the precise positioning and stable installation of the insulating sealing ring 5. The outer periphery of the insulating sealing ring 5 is precisely inserted into this mounting groove, which not only ensures the correct installation position of the sealing ring but also effectively improves its fixation and sealing performance. Through the cooperation between the protrusion 2211 and the curved portion 222, the side wall 22 can tightly engage the outer periphery of the insulating sealing ring 5, preventing it from shifting or loosening during operation, thereby ensuring the dual effects of electrical insulation and mechanical sealing, and enhancing stability and safety.

[0037] In some possible implementations, as shown in Figures 2, 4, or 6, the inner periphery of the insulating sealing ring 5 is provided with a slot 52, and the outer periphery of the eaves 32 is inserted into the slot 52. In these possible implementations, the slot 52 can ensure more precise alignment and fixation of the insulating sealing ring 5 during installation, thereby improving the sealing performance and mechanical stability of the entire battery 1000 structure. It can also reduce the potential risk of poor contact or short circuit due to improper installation, thus improving the safety of the battery 1000.

[0038] In some possible implementations, as shown in Figures 2, 4, or 6, the slot 52 extends beyond the bend 222 in the direction from the main side 221 toward the through hole 111. In these possible implementations, the slot 52 extending beyond the bend 222 in the direction from the main side 221 toward the through hole 111 means that a portion of the insulating sealing ring 5 is outside the edge of the bend 222 and not completely covered. This extended portion provides additional constraint, enabling it to form a tight contact and stable connection with the eaves 32 and the bend 222, ensuring the fixation and sealing effect of the insulating sealing ring 5. It also provides additional barrier to prevent short circuits between the bend 222 and the eaves 32 or the terminal portion 31, enhancing the insulation effect and thus improving the structural stability, safety, and reliability of the battery 1000.

[0039] Understandably, the electrolyte is sealed inside the housing 2. If the sealing effect of the insulating sealing ring 5 between the eaves 32 and the side wall 22 is not good, the electrolyte will flow out along the space between the insulating sealing ring 5 and the eaves 32 and / or the bend 222. Due to the obstruction of the insulating plate 1, the leakage of electrolyte out of the battery 1000 can be suppressed.

[0040] In some possible implementations, as shown in Figures 4 or 6, the inner portion 11 at least partially extends into the central hole 51. In these possible implementations, the inner portion 11 of the insulating plate 1 at least partially extends into the central hole 51 of the insulating sealing ring 5, which can more directly form an effective barrier on the potential outflow path of the electrolyte. By physically occupying part of the space of the central hole 51, it can cooperate with the structural depth of the insulating sealing ring 5 to form a multiple sealing barrier, which can effectively prevent the electrolyte from overflowing and ensure the safety and performance stability of the battery 1000 under various operating conditions.

[0041] In some possible implementations, as shown in Figure 4, the connecting portion 12 abuts against the insulating sealing ring 5. In these possible implementations, the connecting portion 12 abuts against the insulating sealing ring 5, providing a stable fixing point for the insulating plate 1, enhancing its stability and resistance to deformation, and avoiding performance degradation due to displacement or deformation. At the same time, this connection method more effectively cuts off the electrolyte flow path between the insulating sealing ring 5 and the bent portion 222, reducing the risk of electrolyte leakage, thereby improving the safety and reliability of the battery 1000.

[0042] In some possible implementations, as shown in Figure 6, the inner side 11 abuts against the eaves 32. In these possible implementations, the direct contact between the inner side 11 and the eaves 32 provides an additional fixed support point for the insulating plate 1, enhancing its stability and resistance to deformation, and avoiding performance degradation due to displacement or deformation. At the same time, the design of the inner side 11 abutting against the eaves 32 can effectively cut off and reduce the electrolyte flow path between the insulating sealing ring 5 and the bend 222, as well as between the insulating sealing ring 5 and the eaves 32, enhancing the sealing of the battery 1000, reducing the risk of electrolyte leakage, and thus improving the safety and reliability of the battery 1000.

[0043] In some possible implementations, see Figure 2, Figure 4 or Figure 6, the housing assembly 100 of the battery 1000 also includes an explosion-proof plate 6 and a perforated plate 7. The explosion-proof plate 6 is located on the side of the end cover 3 facing the bottom wall 21. The outer periphery of the explosion-proof plate 6 is connected to the eaves 32 and is inserted into the slot 52 together. The perforated plate 7 is located on the side of the explosion-proof plate 6 away from the end cover 3. In these possible implementations, the outer periphery of the explosion-proof plate 6 is connected to the eaves 32 of the end cap 3 and is inserted into the slot 52 of the insulating sealing ring 5 together, which increases the structural strength, stability and sealing of the entire assembly. When the internal pressure of the battery 1000 rises abnormally (such as in the case of overcharging or thermal runaway), the explosion-proof plate 6 can deform or rupture, thereby releasing the pressure accumulated inside the battery 1000 and preventing the battery 1000 from experiencing a more serious explosion accident. The perforated plate 7 works in conjunction with the explosion-proof plate 6. The perforation design on the perforated plate 7 allows gas or other substances to pass through, so as to ensure that the internal pressure of the battery 1000 can be effectively released and improve the safety of the battery 1000.

[0044] In some possible implementations, as shown in Figures 2, 4, or 6, the middle area of ​​the perforated plate 7 and the middle area of ​​the explosion-proof sheet 6 are connected, and the outer periphery of the perforated plate 7 and the outer periphery of the explosion-proof sheet 6 are spaced apart and sandwiched with an insulating gasket 8 for insulation. In these possible implementations, by setting the insulating gasket 8, the perforated plate 7 and the explosion-proof sheet 6 are prevented from forming a short circuit connection in the non-connection area, which would affect the short circuit test and crush test of the battery 1000, thereby ensuring the performance of the battery 1000.

[0045] According to a second aspect of this application, a battery 1000 is provided, including a housing assembly 100 and a battery cell 200. The structure of the housing assembly 100 is as described above, and the battery cell 200 is housed within the housing 2 of the housing assembly 100. Since the battery 1000 adopts all the technical solutions of all the above possible implementations, it has at least the beneficial effects brought by the technical solutions of the above possible implementations, which will not be elaborated here.

Claims

1. A housing assembly (100) for a battery (1000), comprising: The housing (2) has a bottom wall (21) and a side wall (22), the side wall (22) including a main side portion (221) connected to the outer periphery of the bottom wall (21) and a curved portion (222) extending from one end of the main side portion (221) away from the bottom wall (21) toward the central axis of the housing (2); The end cap (3) has a terminal portion (31) and an eave (32) connected to the outer periphery of the terminal portion (31), the eave (32) being located between the curved portion (222) and the bottom wall (21) and being insulated from the side wall (22); A sleeve (4) is fitted over the outer casing (2); and, An insulating plate (1) includes an inner part (11), an outer part (13) disposed around the inner part (11), and a connecting part (12) connecting the inner part (11) and the outer part (13). The outer part (13) is at least partially sandwiched between the sleeve (4) and the bent part (222). The inner part (11) is provided with a through hole (111) for passing through the terminal part (31). The inner part (11) is disposed closer to the bottom wall (21) than the outer part (13).

2. The housing assembly (100) of the battery (1000) according to claim 1, wherein, The connecting part (12) is inclined, and in the radial direction of the through hole (111), the inner periphery of the connecting part (12) is closer to the through hole (111) than the outer periphery of the connecting part (12).

3. The housing assembly (100) of the battery (1000) according to claim 1 or 2, wherein, The surface of the eaves (32) facing the sidewall (22) is coated with an insulating material to form an insulating layer between the eaves (32) and the sidewall (22).

4. The housing assembly (100) of the battery (1000) according to claim 1 or 2, wherein, The sidewall (22) facing the eaves (32) is coated with an insulating material to form an insulating layer between the eaves (32) and the sidewall (22).

5. The housing assembly (100) of the battery (1000) according to claim 1 or 2, wherein the housing assembly (100) of the battery (1000) further comprises an insulating sealing ring (5), the insulating sealing ring (5) having a central hole (51), the inner periphery of the insulating sealing ring (5) being sealed to the eaves (32), and the outer periphery of the insulating sealing ring (5) being sealed to the side wall (22).

6. The battery (1000) housing assembly (100) of claim 5, wherein, The inner side of the main side (221) is provided with a protrusion (2211), the protrusion (2211) and the curved part (222) are spaced apart to define the mounting groove, and the outer periphery of the insulating sealing ring (5) is inserted into the mounting groove.

7. The housing assembly (100) of the battery (1000) according to claim 5, wherein, The inner periphery of the insulating sealing ring (5) is provided with a slot (52), and the outer periphery of the eaves (32) is inserted into the slot (52).

8. The battery (1000) housing assembly (100) of claim 7, wherein, In the direction of the main side portion (221) toward the through hole (111), the slot (52) is provided with its opening extending beyond the curved portion (222).

9. The housing assembly (100) of the battery (1000) according to claim 8, wherein, The inner portion (11) extends at least partially into the central hole (51).

10. The battery (1000) housing assembly (100) of claim 9, wherein, The connecting part (12) abuts against the insulating sealing ring (5).

11. The battery (1000) housing assembly (100) of claim 9, wherein, The inner side (11) abuts against the eaves (32).

12. The housing assembly (100) of the battery (1000) according to any one of claims 7 to 11, wherein the housing assembly (100) of the battery (1000) further comprises: An explosion-proof plate (6) is provided on the side of the end cap (3) facing the bottom wall (21). The outer periphery of the explosion-proof plate (6) is connected to the eaves (32) and is inserted into the slot (52). A perforated plate (7) is provided on the side of the explosion-proof sheet (6) away from the end cap (3).

13. The housing assembly (100) of the battery (1000) according to claim 12, wherein, The middle region of the perforated plate (7) is connected to the middle region of the explosion-proof sheet (6), and the outer periphery of the perforated plate (7) and the outer periphery of the explosion-proof sheet (6) are spaced apart.

14. The housing assembly (100) of the battery (1000) according to claim 13, the housing assembly (100) of the battery (1000) further includes an insulating gasket (8) sandwiched between the outer periphery of the perforated plate (7) and the outer periphery of the explosion-proof sheet (6).

15. A battery (1000), comprising: The housing assembly (100) of the battery (1000) as described in any one of claims 1 to 14; and, The battery cell (200) is housed within the housing (2).

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