Shell assembly and battery

Abstract

The invention relates to the technical field of batteries, and provides a shell assembly and a battery. The shell assembly comprises a shell body and an elastic piece, the shell body is provided with a containing cavity, openings are formed in the two ends of the containing cavity in the length direction, and the containing cavity is used for containing the pole group; a mounting opening is formed in the bottom surface of the shell body and is used for mounting an anti-explosion valve; elastic pieces are fixed to the two ends of the bottom face of the containing cavity and are arranged close to the opening. The mounting opening is formed in the bottom face of the shell body, the anti-explosion valve can be opened through the mounting opening, and mounting is convenient; the elastic pieces are arranged at the two ends, close to the opening, of the bottom face of the containing cavity in the length direction, so that in the pole group assembling process, the pole group can be prevented from being scratched, an insulating film is protected, and the insulating film is prevented from being damaged; and the elastic piece also prevents the pole group from moving, so that the tab is torn and the pole piece is damaged. According to the embodiment of the invention, the assembly efficiency can be improved, and the product yield is also improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a shell assembly and battery. BACKGROUND

[0002] With the pursuit of clean energy and sustainable development around the world, lithium-ion battery technology has developed rapidly in recent years and is increasingly mature. Due to its high energy density, long cycle life, and relatively low self-discharge rate, lithium-ion batteries as power batteries have been widely used in electric vehicles and energy storage fields. In these application scenarios, the performance and safety of lithium-ion batteries are increasingly stringent requirements. The performance of the battery not only relates to the operating efficiency and endurance of the equipment, but also directly affects the safety of the user and the reliability of the equipment.

[0003] As the core component of the battery pack, the safety and assembly performance of the lithium battery cell in the battery pack play a decisive role in the stable operation of the entire battery system. Therefore, the structural design of the lithium battery cell is a key factor to ensure the safety of the battery cell, which has attracted much attention in the industry.

[0004] Currently, the spacing and inner weld height of the pole group in the shell are not standardized, which can cause the insulating film in the pole group to be easily damaged. The unreasonable spacing of the pole group in the shell can cause the pole group to move and cause the pole lug to tear and the pole piece to be damaged, affecting the yield of the product. SUMMARY

[0005] The present application provides a shell assembly and battery to solve the problem of the insulating film in the pole group being easily broken, the pole lug being easily torn, and the pole piece being damaged, which affects the yield of the product.

[0006] The present application provides a shell assembly, comprising: a shell body having a receiving cavity, the receiving cavity having two ends in the length direction provided with openings, the receiving cavity being used to accommodate a pole group; the bottom surface of the shell body being provided with a mounting port, the mounting port being used to mount an explosion-proof valve; an elastic member, both ends of the bottom surface of the receiving cavity being fixed with the elastic member, the elastic member being arranged close to the opening.

[0007] According to the shell assembly provided by the present application, the elastic member is fixed on the bottom surface of the receiving cavity by pasting.

[0008] According to the shell assembly provided by the present application, both ends of the bottom surface of the receiving cavity are provided with notches, and the elastic member is fixed in the notches.

[0009] According to the shell assembly provided by the present application, the depth of the notch is H, the thickness of the elastic member is T, 0.1mm≤T≤0.2mm, and 0.03mm≤H-T≤0.2mm.

[0010] According to a housing assembly provided by the present invention, the length of the notch along the length direction of the receiving cavity is W, 15mm≤W≤30mm.

[0011] According to a housing assembly provided by the present invention, the bottom surface of the receiving cavity is further provided with an exhaust groove, which extends along the length direction of the receiving cavity.

[0012] According to a housing assembly provided by the present invention, there are multiple exhaust channels, and the multiple exhaust channels are spaced apart along the width direction of the receiving cavity.

[0013] According to a housing assembly provided by the present invention, the width of the venting groove is L, 1.2mm≤L≤10mm; the number of venting grooves is n, and the width of the receiving cavity is F; 0.3 < (n L) / F≤0.55.

[0014] According to a housing assembly provided by the present invention, the depth of the venting groove is h, where 0.15mm≤h≤0.3mm.

[0015] The present invention also provides a battery, including the above-described housing assembly, and further including an electrode assembly and an end plate assembly. The electrode assembly is disposed in the receiving cavity, and the openings at both ends of the receiving cavity are covered by the end plate assembly. The outer wall surface of the end plate assembly abuts against an elastic member.

[0016] The housing assembly and battery provided by this invention facilitate installation by providing an installation port on the bottom surface of the housing body, through which the explosion-proof valve can be opened. Furthermore, by placing elastic elements at both ends of the bottom surface of the receiving cavity near the openings along its length, elastic elements prevent the electrode assemblies from rubbing together during assembly, protecting the insulating film and preventing damage. These elastic elements also prevent the electrode assemblies from shifting, which could lead to tearing of the electrode tabs or damage to the electrode sheets. This invention not only improves assembly efficiency but also increases product yield. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention 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 invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the housing assembly provided by the present invention.

[0019] Figure 2 This is an exploded view of the housing assembly provided by the present invention.

[0020] Figure 3This is a bottom view of the housing assembly provided by the present invention.

[0021] Figure 4 This invention provides Figure 3 A schematic diagram of the cross section of AA.

[0022] Figure 5 This invention provides Figure 4 A magnified view of a portion of region P.

[0023] Figure 6 This invention provides Figure 3 A schematic diagram of the cross-section of BB.

[0024] Figure 7 This invention provides Figure 6 A magnified view of the Q region.

[0025] Figure 8 This is a schematic diagram of the battery structure provided by the present invention.

[0026] Figure 9 This is an exploded view of the battery provided by the present invention.

[0027] Figure 10 This is a bottom view of the battery provided by the present invention.

[0028] Figure 11 This invention provides Figure 10 A cross-sectional schematic diagram of the CC region.

[0029] Figure 12 This invention provides Figure 11 A magnified view of a portion of region M.

[0030] Figure 13 This invention provides Figure 10 A cross-sectional schematic diagram of the DD region.

[0031] Figure 14 This invention provides Figure 13 A magnified view of a portion of region N.

[0032] Figure label: 10. Housing assembly; 11. Housing body; 111. Receiving cavity; 112. Opening; 113. Notch; 114. Vent groove; 115. Mounting port; 12. Elastic element; 20. Insulating film; 30. Electrode assembly; 40. Explosion-proof valve; 50. End plate assembly; 51. End plate; 52. Cover plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0035] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0039] The following is combined Figures 1-14 The housing assembly 10 and the battery of the present invention are described.

[0040] The housing assembly 10 provided in this embodiment of the invention includes a housing body 11 and elastic members 12. The housing body 11 has a receiving cavity 111, with openings 112 at both ends along its length, for receiving the electrode assembly 30. The bottom surface of the housing body 11 has a mounting port 115 for installing the explosion-proof valve 40. Elastic members 12 are provided at both ends of the bottom surface of the receiving cavity 111, and the elastic members 12 are positioned close to the openings 112.

[0041] like Figure 1 and Figure 2 As shown, the shell body 11 has a rectangular structure and a receiving cavity 111. Openings 112 are provided at both ends of the receiving cavity 111 along its length, allowing the pole assembly 30 to be placed into the receiving cavity 111 through one of the openings 112. Figure 3 and Figure 4 As shown, the bottom surface of the shell body 11 is provided with a mounting port 115, and the explosion-proof valve 40 is installed in the mounting port 115 and can be opened through the mounting port 115, such as... Figure 10 and Figure 11 As shown. Compared to the prior art where the installation port 115 of the explosion-proof valve 40 is located on the end plate assembly 50, installation is more convenient. In some embodiments of the present invention, the adjacent two walls of the shell body 11 are connected by rounded corners or chamfers. Correspondingly, rounded corners or chamfers are provided at corresponding positions on the pole assembly 30, which is beneficial for the pole assembly 30 to enter the shell and reduces the risk of the pole assembly 30 being scratched.

[0042] An insulating film 20 is applied to the outer wall surface of the electrode assembly 30. Elastic members 12 are fixed at both ends of the bottom surface of the receiving cavity 111 along its length. Figure 2As shown, the elastic element 12 is positioned near the opening 112. When the electrode assembly 30 is inserted into the receiving cavity 111 through the opening 112, the electrode assembly 30 preferentially contacts the elastic element 12, preventing the electrode assembly 30 from rubbing against the elastic element 12, protecting the insulating film 20, and preventing damage to the insulating film 20. It also prevents the electrode assembly 30 from shifting, which could lead to tearing of the electrode tabs or damage to the electrode sheets. The end plate assembly 50 covers the opening 112, and its outer wall surface abuts against the elastic element 12, stably fixing the end plate assembly 50 at the opening 112 and achieving a seal. Compared to the prior art, this embodiment of the invention eliminates the side plate structure, reduces the number of parts, lowers the manufacturing difficulty, and avoids defects caused by side plate heat melting and assembly.

[0043] The housing assembly 10 provided in this embodiment of the invention features an installation port 115 on the bottom surface of the housing body 11, through which the explosion-proof valve 40 can be opened, facilitating installation. Elastic members 12 are provided at both ends of the bottom surface of the receiving cavity 111 near the opening 112 along its length direction. These elastic members prevent the electrode assembly 30 from scraping during assembly, protecting the insulating film 20 and preventing damage. The elastic members 12 also prevent the electrode assembly 30 from shifting, which could lead to tearing of the electrode tabs or damage to the electrode sheets. This embodiment of the invention not only improves assembly efficiency but also increases product yield.

[0044] In this embodiment of the invention, the elastic element 12 can be elastic foam adhesive, which has a good buffering effect when the electrode assembly 30 moves.

[0045] In this embodiment of the invention, the elastic element 12 can be fixed to the bottom surface of the receiving cavity 111 by adhesive. In one embodiment, the elastic element 12 is provided with adhesive backing, and the elastic element 12 is adhered to the side of the bottom surface of the receiving cavity 111 near the opening 112 by the adhesive backing. In another embodiment, the elastic element 12 can also be snapped onto the bottom surface of the receiving cavity 111 by a slot.

[0046] In some embodiments of the present invention, such as Figure 2 and Figure 5 As shown, the bottom surface of the receiving cavity 111 has notches 113 at both ends, and the notches 113 extend from the end face of the adjacent opening 112 toward the interior of the receiving cavity 111. An elastic member 12 is fixed within the notch 113. In one embodiment, the elastic member 12 is fixed to the bottom surface of the notch 113 by adhesive bonding. In another embodiment, the bottom surface of the notch 113 has a limiting hole, and one side of the elastic member 12 has a protrusion that can be inserted into the limiting hole. It should be noted that the size of the protrusion is slightly larger than the limiting hole. Under the action of external force, the protrusion is inserted into or pulled out of the limiting hole; that is, when the protrusion is inserted into the limiting hole, the outer wall surface of the protrusion is interference-fitted with the inner wall surface of the limiting hole.

[0047] In some embodiments of the present invention, the thickness of the elastic element 12 is T, where 0.1mm≤T≤0.2mm, and the thickness T of the elastic element 12 can be 0.1mm, 0.15mm, 0.2mm, etc.

[0048] In some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, the depth of the notch 113 is H, 0.03mm ≤ HT ≤ 0.2mm. Optionally, HT can be 0.03mm, 0.05mm, 0.1mm, 0.16mm, 0.2mm, etc. In one embodiment, the thickness T of the elastic member 12 is 0.1mm, and the depth H of the notch 113 is 0.15mm, 0.2mm, etc.

[0049] In some embodiments of the present invention, such as Figure 5 As shown, the length of the notch 113 along the length direction of the receiving cavity 111 is W, 15mm≤W≤30mm. In some embodiments, the length W of the notch 113 is 15mm, 16mm, 18mm, 20mm, 23mm, 25mm, 28mm, 30mm, etc.

[0050] In some embodiments of the present invention, the length of the elastic member 12 is less than W. In one embodiment, when the elastic member 12 is fixed to the notch 113, the center of the length direction of the elastic member 12 coincides with the center of the length direction of the notch 113, that is, assembly error is set to reduce assembly difficulty.

[0051] In some embodiments of the present invention, the bottom surface of the notch 113 away from the opening 112 is connected to the inner wall of the receiving cavity 111 by a bevel or rounded corner, which facilitates the smooth installation of the pole assembly 30 into the appropriate position.

[0052] In some embodiments of the present invention, the bottom surface of the receiving cavity 111 is further provided with an exhaust groove 114, such as... Figure 2 As shown, the venting groove 114 extends along the length direction of the receiving cavity 111, that is, it is aligned with the length direction of the notch 113. In this embodiment of the invention, by providing the venting groove 114 on the bottom surface of the receiving cavity 111, venting is facilitated, and electrolyte flow is also aided. In one embodiment, the venting groove 114 is located at the center of the width direction of the bottom surface of the receiving cavity 111.

[0053] In this embodiment of the invention, there can be multiple venting grooves 114, which are spaced apart along the width direction of the receiving cavity 111 to improve the venting effect and accelerate the flow of electrolyte. Figure 6 and Figure 7 As shown, the bottom surface of the receiving cavity 111 is provided with 6 exhaust grooves 114.

[0054] In some embodiments of the present invention, such as Figure 7As shown, the width of the exhaust groove 114 is L, 1.2mm≤L≤10mm. Optionally, the width L of the exhaust groove 114 can be 1.2mm, 1.5mm, 2mm, 2.3mm, 3mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.7mm, 6mm, 6.6mm, 7mm, 7.7mm, 8mm, 8.2mm, 9mm, 9.8mm, 10mm, etc.

[0055] In this embodiment of the invention, the width of the receiving cavity 111 is F, such as... Figure 7 As shown, 14mm ≤ F ≤ 118mm. Optionally, F can be 14mm, 23mm, 50mm, 118mm, etc. It can be understood that the width of the receiving cavity 111 is set according to the dimensions of the electrode assembly 30.

[0056] In this embodiment of the invention, the number of exhaust grooves 114 is n, and the number n and the width L of the exhaust grooves 114 can be set according to the width F of the receiving cavity 111.

[0057] In some embodiments of the present invention, 0.3 < (n When L) / F≤0.55, a support portion is formed between two adjacent exhaust grooves 114 when the electrode assembly 30 is installed in the receiving cavity 111. This provides stable support for the electrode assembly 30 and prevents the electrode assembly 30 from sinking due to excessive number n of exhaust grooves 114 and / or excessive width L of exhaust grooves 114 affecting the size of the support portion.

[0058] Table 1. Scratching during electrode assembly installation and product yield under different parameters.

[0059] In some embodiments of the present invention, such as Figure 7 As shown, the depth of the exhaust groove 114 is h, where 0.15mm ≤ h ≤ 0.3mm. Optionally, h can be 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, etc.

[0060] In some embodiments of the present invention, the venting groove 114 is disposed between two notches 113, such as Figure 2 As shown. In one embodiment, the depth h of the vent groove is less than the depth H of the notch 113.

[0061] In this embodiment of the invention, the exhaust groove 114 can be prepared by extruding tubing.

[0062] Based on the above embodiments, the present invention conducted corresponding experiments, as shown in Table 1, to examine the scratching condition and product yield of the electrode assembly 30 when it is installed in the casing under different parameters.

[0063] likeFigure 8 and Figure 9 As shown, this embodiment of the invention also provides a battery, including the housing assembly 10 of any of the above embodiments. The battery further includes an electrode group 30 and an end plate assembly 50, with the electrode group 30 disposed within a receiving cavity 111. Openings 112 at both ends of the receiving cavity 111 cover the end plate assembly 50, and the outer wall surface of the end plate assembly 50 abuts against the elastic member 12.

[0064] Specifically, the electrode assembly 30 is inserted into the receiving cavity through the opening 112, and the end of the electrode assembly 30 near the opening contacts the elastic element, such as... Figure 12 As shown; a support portion is formed between two adjacent exhaust grooves 114 on the bottom surface of the receiving cavity 111. The bottom surface of the electrode assembly 30 abuts against the support portion to provide support and prevent the electrode assembly from sinking, as shown. Figure 13 and Figure 14 As shown. Figure 9 As shown, the end plate assembly 50 includes an end plate 51 and a cover plate 52. The end plate 51 is inserted into the opening 112, and the outer wall surface of the end plate 51 abuts against the elastic member 12, providing a good fixing effect and also achieving a sealing effect. Furthermore, the cover plate 52 covers the end plate 51 to fix and seal the end plate 51, achieving a double seal.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A housing assembly, characterized in that, include: The shell body has a receiving cavity with openings at both ends along its length, and the receiving cavity is used to receive the electrode assembly; the bottom surface of the shell body has a mounting port for installing an explosion-proof valve. The elastic element is fixed at both ends of the bottom surface of the receiving cavity, and the elastic element is disposed close to the opening.

2. The housing assembly according to claim 1, characterized in that, The elastic element is fixed to the bottom surface of the receiving cavity by adhesive.

3. The housing assembly according to claim 1, characterized in that, Both ends of the bottom surface of the receiving cavity are provided with notches, and the elastic element is fixed to the notches.

4. The housing assembly according to claim 3, characterized in that, The depth of the notch is H, and the thickness of the elastic element is T, where 0.1mm ≤ T ≤ 0.2mm; 0.03mm≤HT≤0.2mm.

5. The housing assembly according to claim 4, characterized in that, The length of the notch along the length of the receiving cavity is W, where 15mm ≤ W ≤ 30mm.

6. The housing assembly according to claim 1, characterized in that, The bottom surface of the receiving cavity is also provided with an exhaust groove, which extends along the length of the receiving cavity.

7. The housing assembly according to claim 6, characterized in that, There are multiple exhaust channels, and the multiple exhaust channels are spaced apart along the width direction of the receiving cavity.

8. The housing assembly according to claim 7, characterized in that, The width of the exhaust groove is L, 1.2mm≤L≤10mm; the number of exhaust grooves is n; and the width of the receiving cavity is F. 0.3<(n L) / F≤0.55。 9. The housing assembly according to claim 7, characterized in that, The depth of the exhaust groove is h, where 0.15mm ≤ h ≤ 0.3mm.

10. A battery, characterized in that, The housing assembly as described in any one of claims 1 to 9 further includes an electrode assembly and an end plate assembly, wherein the electrode assembly is disposed within the receiving cavity, and the openings at both ends of the receiving cavity are covered by the end plate assembly, and the outer wall surface of the end plate assembly abuts against the elastic element.

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