Secondary battery structure

Abstract

The utility model provides a secondary battery structure which comprises a shell and a top cover structure, and the shell is provided with an accommodating groove for accommodating a battery cell; and the top cover structure covers the notch of the accommodating groove, and the top cover structure is hermetically connected with the shell through a hot melt adhesive. The secondary battery structure solves the problem that the shell and the top cover of the secondary battery structure in the prior art cannot be detached.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a secondary battery structure. Background Art

[0002] In the prior art, a secondary battery structure in a square shape usually includes a shell, a battery cell arranged in the shell, and a top cover arranged on the shell. The existing assembly method of the shell and the top cover mostly adopts laser pre-welding + laser welding. The laser welds along the weld between the top cover and the shell to ensure the sealing of the secondary battery structure and the bonding strength between the top cover and the shell.

[0003] However, the above-mentioned assembly method is an irreversible assembly method. The secondary battery structure after laser welding is assembled into an integrated structure and cannot be disassembled. When an abnormal state is detected in the battery cell, the entire secondary battery structure will be scrapped and cannot be repaired. Utility Model Content

[0004] The main purpose of the utility model is to provide a secondary battery structure to solve the problem that the outer shell and the top cover of the secondary battery structure in the prior art cannot be disassembled.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a secondary battery structure, including a shell and a top cover structure, wherein the shell has a receiving groove for receiving the battery cell; the top cover structure is covered at the notch of the receiving groove, and the top cover structure is sealed and connected to the shell by hot melt adhesive.

[0006] Furthermore, the groove wall surface of the accommodating groove has a first bonding ring surface, the top cover structure has a second bonding ring surface at a position opposite to the first bonding ring surface, and hot melt adhesive is provided between the first bonding ring surface and the second bonding ring surface.

[0007] Furthermore, in the direction from the slot opening to the bottom of the accommodating slot, the outer periphery of the top cover structure has a first abutting ring surface, a first supporting ring surface, and a second bonding ring surface which are connected in sequence; wherein, the first abutting ring surface extends in the vertical direction, the first supporting ring surface extends in the horizontal direction, and the second bonding ring surface extends in the vertical direction, and the cross-section of the hot melt adhesive is L-shaped, and the first ring segment of the L-shaped hot melt adhesive extends into the gap between the first bonding ring surface and the second bonding ring surface, and the second ring segment of the L-shaped hot melt adhesive overlaps the first supporting ring surface and abuts against the first abutting ring surface.

[0008] Furthermore, there are at least two circles of hot melt adhesive between the first bonding ring surface and the second bonding ring surface, which are arranged at intervals along the direction from the groove opening to the groove bottom of the accommodating groove.

[0009] Furthermore, a transition inclined surface is provided between the first supporting ring surface and the second bonding ring surface, so that a guide port for the hot melt adhesive to flow in is formed between the transition inclined surface and the first bonding ring surface.

[0010] Furthermore, the inclination angle A of the transition inclined surface satisfies: 45°≤A≤60°.

[0011] Furthermore, there is at least one sealing ring between the first bonding ring surface and the second bonding ring surface, and the sealing ring is located on the side of the hot melt adhesive facing the bottom of the receiving groove.

[0012] Furthermore, one of the first bonding ring surface and the second bonding ring surface has a limiting groove, and the groove wall surface of the limiting groove is matched with a part of the outer circumference of the sealing ring, so that a part of the sealing ring is embedded in the limiting groove.

[0013] Further, the limiting groove is one that is continuously arranged around the circumference of the first bonding ring surface; or, the limiting groove is one that is continuously arranged around the circumference of the second bonding ring surface; or, the limiting grooves are multiple and are arranged at intervals around the circumference of the first bonding ring surface; or, the limiting grooves are multiple and are arranged at intervals around the circumference of the second bonding ring surface.

[0014] Furthermore, a support ring platform is provided at the groove opening of the accommodating groove, and in the vertical direction, the first bonding ring surface is connected to the support ring platform on the side facing the groove bottom of the accommodating groove; the top cover structure includes a connected support ring plate and a shielding plate, the support ring plate is located on the outer peripheral side of the shielding plate, and the support ring plate extends from the groove opening of the accommodating groove to the groove bottom, and is overlapped on the support ring platform.

[0015] By applying the technical solution of the utility model, the top cover structure and the shell are sealed and connected by hot-melt adhesive. Thus, on the one hand, the connection reliability between the top cover structure and the shell and the sealing reliability of the secondary battery structure are ensured; on the other hand, when the secondary battery structure needs to be supplemented with electrolyte, the hot-melt adhesive is removed by heating, thereby achieving the detachability of the top cover structure and the shell, and facilitating the subsequent supplementation of electrolyte to the secondary battery structure, so as to delay the cycle life and capacity level of the secondary battery structure; in addition, the battery cells in the shell or the receiving slot can also be repaired, which is beneficial to improving the product quality of the secondary battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the exploded structure of a secondary battery structure according to an optional embodiment of the utility model is shown;

[0018] Figure 2 Shows Figure 1 A partially enlarged structural schematic diagram of a secondary battery structure;

[0019] Figure 3 Shows Figure 2 Schematic diagram of the exploded structure of some secondary battery structures;

[0020] Figure 4 Shows Figure 3 Schematic diagram of the enlarged structure at the transition inclined surface.

[0021] The above drawings include the following reference numerals:

[0022] 10. Shell; 11. Accommodating groove; 111. First bonding annular surface; 112. Supporting ring platform;

[0023] 20. Top cover structure; 21. Second bonding annular surface; 211. Position limiting groove; 22. First abutting annular surface; 23. First supporting annular surface; 24. Transition inclined surface; 25. Supporting ring plate; 26. Shielding plate;

[0024] 30. hot melt adhesive; 31. first ring segment; 32. second ring segment;

[0025] 40. Sealing ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In order to solve the problem that the outer shell and the top cover of the secondary battery structure in the prior art cannot be disassembled, the utility model provides a secondary battery structure.

[0028] like Figures 1 to 4 As shown, the secondary battery structure includes a shell 10 and a top cover structure 20, wherein the shell 10 has a receiving groove 11 for receiving the battery cell; the top cover structure 20 is covered at the notch of the receiving groove 11, and the top cover structure 20 is sealed and connected to the shell 10 by hot melt adhesive 30.

[0029] By applying the technical solution of the utility model, the top cover structure 20 and the shell 10 are sealed and connected by the hot melt adhesive 30. In this way, on the one hand, the connection reliability between the top cover structure 20 and the shell 10 and the sealing reliability of the secondary battery structure are ensured. On the other hand, when it is necessary to replenish the electrolyte of the secondary battery structure, the hot melt adhesive 30 is removed by heating, so that the top cover structure 20 and the shell 10 can be disassembled, which is convenient for the subsequent replenishment of the electrolyte of the secondary battery structure, so as to delay the cycle life and capacity level of the secondary battery structure; in addition, the battery cells in the shell 10 or the receiving slot 11 can also be repaired, which is beneficial to improve the product quality of the secondary battery structure.

[0030] It should be noted that, in the present application, the melting temperature of the hot melt adhesive 30 is 180±10°C, the peel strength of the hot melt adhesive 30 is >5N / in2, and the softening temperature of the hot melt adhesive 30 is 140±5°C.

[0031] Preferably, the hot melt adhesive 30 can be removed after being heated by a hot air gun until it softens, thereby achieving a two-way loading and unloading action.

[0032] It should be noted that, in the present application, after the hot melt adhesive 30 is removed by heating, the top cover structure 20 and the battery cell are disassembled by using a clamp.

[0033] like Figure 2 and Figure 3 As shown, the groove wall surface of the receiving groove 11 has a first bonding ring surface 111, the top cover structure 20 has a second bonding ring surface 21 at a position opposite to the first bonding ring surface 111, and hot melt adhesive 30 is provided between the first bonding ring surface 111 and the second bonding ring surface 21. In this way, the connection reliability between the top cover structure 20 and the housing 10 and the sealing reliability of the space enclosed between the two are ensured.

[0034] It should be noted that, in an embodiment not shown in the figure of the present application, there are at least two circles of hot melt adhesive 30 arranged in a spaced relationship from the notch to the bottom of the receiving groove 11 between the first bonding ring surface 111 and the second bonding ring surface 21. In another possible embodiment, as Figure 2 and Figure 3As shown, in the direction from the notch of the receiving groove 11 to the groove bottom, the outer periphery of the top cover structure 20 has a first abutting ring surface 22, a first supporting ring surface 23, and a second bonding ring surface 21 connected in sequence; wherein, the first abutting ring surface 22 extends in the vertical direction, the first supporting ring surface 23 extends in the horizontal direction, and the second bonding ring surface 21 extends in the vertical direction. The cross section of the hot melt adhesive 30 is L-shaped, and the first ring segment 31 of the L-shaped hot melt adhesive 30 extends into the gap between the first bonding ring surface 111 and the second bonding ring surface 21, and the second ring segment 32 of the L-shaped hot melt adhesive 30 overlaps the first supporting ring surface 23 and abuts against the first abutting ring surface 22. In this way, the bonding firmness of the hot melt adhesive 30 to the top cover structure 20 and the shell 10 is ensured.

[0035] It should be noted that, in the present application, the height H1 of the second ring segment 32 in the vertical direction and the height H2 of the first abutting annular surface 22 in the vertical direction satisfy: H1 = H2, so that the upper surface of the second ring segment 32 is flush with the upper surface of the top cover structure 20. In this way, it is helpful to improve the overall appearance of the secondary battery structure. It should be noted that the vertical direction in the present application is the direction from the notch of the receiving groove 11 to the bottom of the groove.

[0036] like Figure 2 and Figure 3 As shown, there is a transition inclined surface 24 between the first supporting annular surface 23 and the second bonding annular surface 21, so that a guide port for the hot melt adhesive 30 to flow in is formed between the transition inclined surface 24 and the first bonding annular surface 111. In this way, the smoothness of the hot melt adhesive 30 when flowing in is ensured, and enough hot melt adhesive 30 is ensured to participate in the sealing between the top cover structure 20 and the shell 10.

[0037] It should be noted that in this application, Figure 2 and Figure 3 As shown, the transition inclined surface 24 is arranged obliquely along the side of the groove wall facing away from the accommodating groove 11 .

[0038] It should be noted that, in the present application, the inclination angle A of the transition inclined surface 24 satisfies: 45°≤A≤60°. In this way, by reasonably optimizing the inclination angle A of the transition inclined surface 24, it is avoided that the transition inclined surface 24 is too small to effectively guide the hot melt adhesive 30, and it is avoided that the inclination angle A of the transition inclined surface 24 is too large to cause the guide port to be too small. Figure 4 .

[0039] like Figures 1 to 3As shown, there is at least one sealing ring 40 between the first bonding ring surface 111 and the second bonding ring surface 21, and the sealing ring 40 is located on the side of the hot melt adhesive 30 facing the bottom of the receiving groove 11. In other words, the sealing ring 40 is located between the bottom of the receiving groove 11 and the hot melt adhesive 30. In this way, the sealing ring 40 is arranged so that the sealing ring 40 and the hot melt adhesive 30q play a double sealing role in the space enclosed by the top cover structure 20 and the shell 10, thereby ensuring the sealing reliability of the space enclosed between the top cover structure 20 and the shell 10.

[0040] It should be noted that, in the present application, the cross-sectional area of ​​the sealing ring 40 is greater than the width of the gap between the first bonding ring surface 111 and the second bonding ring surface 21, so that the sealing ring 40 is squeezed between the first bonding ring surface 111 and the second bonding ring surface 21, thereby ensuring the sealing reliability of the sealing ring 40.

[0041] Optionally, the cross-sectional area of ​​the sealing ring 40 is generally 1.5 to 2 times the width of the gap between the first bonding ring surface 111 and the second bonding ring surface 21 .

[0042] Preferably, the material of the sealing ring 40 needs to be a non-metallic material, usually hydrogenated nitrile rubber or fluorosilicone rubber or other suitable modified materials.

[0043] like Figure 2 and Figure 3 As shown, one of the first bonding ring surface 111 and the second bonding ring surface 21 has a limiting groove 211, and the groove wall surface of the limiting groove 211 is matched with a part of the outer peripheral surface of the sealing ring 40, so that a part of the sealing ring 40 is embedded in the limiting groove 211. In this way, the setting of the limiting groove 211 plays a role in limiting the sealing ring 40, preventing the sealing ring 40 from moving in the gap between the first bonding ring surface 111 and the second bonding ring surface 21, thereby ensuring the sealing reliability of the space enclosed by the sealing ring 40, the top cover structure 20 and the housing 10.

[0044] Optionally, the limiting groove 211 is one that is continuously arranged around the circumference of the first bonding annular surface 111 .

[0045] Optionally, the limiting groove 211 is one that is continuously arranged around the circumference of the second bonding annular surface 21 .

[0046] Optionally, a plurality of limiting grooves 211 are arranged at intervals around the circumference of the first bonding annular surface 111 .

[0047] Optionally, a plurality of limiting grooves 211 are arranged at intervals around the circumference of the second bonding annular surface 21 .

[0048] Preferably, the second bonding annular surface 21 has two limiting grooves 211 , and the secondary battery structure has two sealing rings 40 , and the two sealing rings 40 are arranged in a one-to-one correspondence with the two limiting grooves 211 .

[0049] like Figure 2 and Figure 3 As shown, the slot of the receiving groove 11 is provided with a support ring 112, and in the vertical direction, the first bonding ring surface 111 is connected to the support ring 112 on the side facing the bottom of the receiving groove 11; the top cover structure 20 includes a connected support ring plate 25 and a shielding plate 26, the support ring plate 25 is located on the outer peripheral side of the shielding plate 26, and the support ring plate 25 extends from the slot of the receiving groove 11 to the bottom of the groove, and overlaps the support ring 112. In this way, the setting of the support ring 112 ensures that the support ring 112 can provide effective and reliable support to the top cover structure 20 through the cooperation of the support ring 112 and the support ring plate 25, thereby preventing the top cover structure 20 from falling into the receiving groove 11.

[0050] like Figure 2 and Figure 3 As shown, the first abutting annular surface 22 , the first supporting annular surface 23 , the second bonding annular surface 21 and the transition inclined surface 24 are all arranged on the outer surface of the supporting ring plate 25 facing away from the battery cell.

[0051] It should be noted that the design of the detachable top cover structure 20 provided in the present application has the following advantages:

[0052] 1) The design realizes the two-way function of the top cover structure 20 and the housing 10 to be assembled and disassembled, replacing the irreversible assembly method of conventional laser welding;

[0053] 2) The battery cell or the housing 10 can be disassembled and replaced separately for repair, thereby improving the product quality of the secondary battery structure;

[0054] 3 After the secondary battery structure product has been used for a long time, it can be disassembled and the electrolyte can be replenished to extend the cycle life and capacity level of the secondary battery structure.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0060] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A secondary battery structure, characterized in that: include: A housing (10), wherein the housing (10) has a receiving groove (11) for receiving a battery cell; A top cover structure (20), wherein the top cover structure (20) is arranged at the notch of the receiving groove (11), and the top cover structure (20) is sealed and connected to the shell (10) by hot melt adhesive (30).

2. The secondary battery structure according to claim 1, characterized in that: The groove wall surface of the accommodating groove (11) has a first bonding ring surface (111), the top cover structure (20) has a second bonding ring surface (21) at a position opposite to the first bonding ring surface (111), and the hot melt adhesive (30) is provided between the first bonding ring surface (111) and the second bonding ring surface (21).

3. The secondary battery structure according to claim 2, characterized in that: In the direction from the notch to the bottom of the containing groove (11), the outer periphery of the top cover structure (20) has a first abutting annular surface (22), a first supporting annular surface (23), and the second bonding annular surface (21) which are connected in sequence; The first abutting ring surface (22) extends in the vertical direction, the first supporting ring surface (23) extends in the horizontal direction, the second bonding ring surface (21) extends in the vertical direction, the cross section of the hot melt adhesive (30) is L-shaped, the first ring segment (31) of the L-shaped hot melt adhesive (30) extends into the gap between the first bonding ring surface (111) and the second bonding ring surface (21), and the second ring segment (32) of the L-shaped hot melt adhesive (30) overlaps the first supporting ring surface (23) and abuts against the first abutting ring surface (22).

4. The secondary battery structure according to claim 2, characterized in that: There are at least two circles of hot melt adhesive (30) between the first adhesive ring surface (111) and the second adhesive ring surface (21) and are arranged at intervals along the direction from the groove opening to the groove bottom of the receiving groove (11).

5. The secondary battery structure according to claim 3, characterized in that: A transition inclined surface (24) is provided between the first supporting annular surface (23) and the second bonding annular surface (21), so that a guide opening for the hot melt adhesive (30) to flow in is formed between the transition inclined surface (24) and the first bonding annular surface (111).

6. The secondary battery structure according to claim 5, characterized in that: The inclination angle A of the transition inclined surface (24) satisfies: 45°≤A≤60°.

7. The secondary battery structure according to any one of claims 2 to 6, characterized in that: At least one sealing ring (40) is provided between the first bonding ring surface (111) and the second bonding ring surface (21), and the sealing ring (40) is located on the side of the hot melt adhesive (30) facing the bottom of the receiving groove (11).

8. The secondary battery structure according to claim 7, characterized in that: One of the first bonding ring surface (111) and the second bonding ring surface (21) has a limiting groove (211), and a groove wall surface of the limiting groove (211) is matched with a part of the outer peripheral surface of the sealing ring (40), so that a part of the sealing ring (40) is embedded in the limiting groove (211).

9. The secondary battery structure according to claim 8, characterized in that: The limiting groove (211) is one that is continuously arranged around the circumference of the first bonding annular surface (111); or, The limiting groove (211) is one that is continuously arranged around the circumference of the second bonding annular surface (21); or, The limiting grooves (211) are multiple and are arranged at intervals around the circumference of the first bonding annular surface (111); or, The limiting grooves (211) are multiple and are arranged at intervals in the circumferential direction around the second bonding annular surface (21).

10. The secondary battery structure according to any one of claims 2 to 6, characterized in that: The receiving groove (11) has a support ring platform (112) at the groove opening, and in the vertical direction, the first bonding ring surface (111) is connected to the support ring platform (112) on the side facing the groove bottom of the receiving groove (11); the top cover structure (20) comprises a support ring plate (25) and a shielding plate (26) connected to each other, the support ring plate (25) is located on the outer peripheral side of the shielding plate (26), and the support ring plate (25) extends from the groove opening to the groove bottom of the receiving groove (11) and overlaps the support ring platform (112).

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