Cover structure and battery

Abstract

The present application relates to the field of battery technology, and in particular to a cover plate structure and a battery, wherein the cover plate structure includes a cover plate body, an insulating connecting portion and at least two pole assemblies. The pole assembly includes a pole and a connecting plate, wherein the connecting plate is arranged on one side of the cover plate body, and the pole passes through the cover plate body along a first direction and is connected to the connecting plate. At least two pole assemblies are arranged in sequence along a second direction, and the two ends of the insulating connecting portion in the second direction are respectively provided with placement holes, and the parts of the connecting plates of the two adjacent pole assemblies can be respectively arranged at the two end placement holes of the insulating connecting portion in the second direction to connect the two adjacent pole assemblies. According to the cover plate structure and the battery provided by the present application, the flatness of the pole assembly is guaranteed, thereby effectively reducing the probability of the connection plate being warped, deformed, and having excessive flatness.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate structure and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural parts of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide protection for lithium-ion batteries in terms of safety and reliability, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules. The battery cover of lithium-ion batteries is an important component of lithium-ion batteries. Therefore, how to ensure the stability of the battery cover has become a technical problem that needs to be solved urgently.

[0003] However, after the existing cover plate, the pole and the connecting plate are riveted, the connecting plate will be warped and deformed, the flatness and size will be out of tolerance, and the palladium sheet welding will easily cause voids and cold solder joints, which will cause the overcurrent temperature rise at the weld mark to be too large, and in severe cases, cause thermal runaway. Summary of the invention

[0004] The purpose of this application is to provide a cover plate structure and a battery, which can solve the existing problems in the prior art to a certain extent, such as the existing cover plate, the rivet block is warped and deformed after the pole and the rivet block are riveted, the flatness size is out of tolerance, the palladium sheet welding is prone to explosion holes and cold welding, and the overcurrent temperature rise at the weld mark is too large, which may cause thermal runaway in severe cases.

[0005] According to a first aspect of the present application, there is provided a cover plate structure, comprising a cover plate body, an insulating connecting portion and at least two pole assemblies;

[0006] The pole assembly comprises a pole and a connecting plate, wherein the connecting plate is arranged on one side of the cover body, and the pole passes through the cover body along a first direction and is connected to the connecting plate;

[0007] The at least two pole assemblies are arranged in sequence along the second direction, and the insulating connecting portion is respectively provided with placement holes at both ends in the second direction. Portions of the connecting plates of two adjacent pole assemblies can be respectively arranged at the placement holes at both ends of the insulating connecting portion in the second direction to connect the two adjacent pole assemblies, and the second direction intersects with the first direction.

[0008] Preferably, the insulating connection part further includes a barrier part, and the two placement holes arranged at two ends of the insulating connection part in the second direction are separated and not connected by the barrier part.

[0009] Preferably, the number of the pole assemblies is two, and the two pole assemblies are fixedly connected via the insulating connecting portion;

[0010] The connecting plate has a first end and a second end opposite to each other in the second direction, the first end being an end of the connecting plate away from the insulating connecting portion;

[0011] The connecting plate is provided with a connecting hole penetrating the connecting plate along the first direction, and the pole passes through the connecting hole and is connected to the connecting plate;

[0012] In the second direction, the connection hole is disposed close to the first end of the connection plate.

[0013] Preferably, a distance from the center of the connecting hole to the second end of the connecting plate in the second direction is defined as y, wherein 20 mm≤y≤50 mm.

[0014] Preferably, the tensile strength of the insulating connecting portion is defined as , the tensile strength of the connecting plate is The dimension of the hole wall of the placement hole away from the cover plate body in the first direction is W 1. The portion of the connecting plate disposed in the placement hole in the first direction W 2;

[0015] in, and .

[0016] Preferably, the distance from the center of the connecting hole to the first end of the connecting plate in the second direction is defined as z, and the radius of the connecting hole is defined as d, wherein z≥d+1.5 mm.

[0017] Preferably, the center of the connecting hole is arranged on the midline of the connecting plate in a third direction, and the third direction is perpendicular to the second direction;

[0018] Define that the size of the connecting plate in the first direction is h, the thickness of the connecting plate at the narrowest part of the parts on both sides of the connecting hole in the third direction is k, the size of the cover plate body in the third direction is D, and the radius of the connecting hole is d, wherein 2mm≤h≤4mm, 1mm≤k≤(D-2d-2).

[0019] Preferably, the pole assembly further comprises a first plastic part, the first plastic part is wrapped around a side of the connecting plate facing the cover plate body, and a portion of the first plastic part extends to the insulating connecting portion.

[0020] Preferably, the two pole assemblies have different polarities.

[0021] According to the second aspect of the present application, a battery is provided, comprising the cover plate structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the cover plate structure, which will not be described in detail herein.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] The cover plate structure provided in the present application connects two adjacent pole assemblies by respectively setting installation holes at both ends of the insulating connecting part in the second direction, and respectively setting parts of the connecting plates of two adjacent pole assemblies in the installation holes at both ends of the insulating connecting part in the second direction, so as to enable the two adjacent pole assemblies to be mutually constrained through the insulating connecting part, thereby ensuring the flatness of the pole assemblies, and thereby effectively reducing the probability of the connecting plate being warped, deformed, or having excessive flatness.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the exploded structure of the cover plate structure provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the axonometric structure of the cover plate structure provided in an embodiment of the present application;

[0028] Figure 3 Another isometric structural schematic diagram of the cover plate structure provided in the embodiment of the present application;

[0029] Figure 4 A schematic diagram of the exploded structure of the connecting plate provided in an embodiment of the present application;

[0030] Figure 5 A schematic cross-sectional view of a cover plate structure provided in an embodiment of the present application;

[0031] Figure 6 Another schematic cross-sectional view of the cover plate structure provided in the embodiment of the present application;

[0032] Figure 7 for Figure 6 The enlarged structural schematic diagram of the cover plate structure at A is shown.

[0033] Reference numerals:

[0034] 11-connecting plate; 110-connecting hole; 12-pole; 121-pole body; 122-limiting plate; 13-first plastic part; 14-insulating gasket; 15-palladium sheet; 3-insulating connecting part; 31-placement hole; 32-blocking part; 4-cover body; 41-explosion-proof hole; 5-second plastic part; 6-explosion-proof valve; 61-patch;

[0035] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0036] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0038] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Refer to the following Figures 1 to 7The cover plate structure and the battery according to some embodiments of the present application are described.

[0042] See also Figures 1 to 7 As shown, an embodiment of the first aspect of the present application provides a cover plate structure, which includes a cover plate body 4, an insulating connection part 3 and at least two pole assemblies. The pole assembly includes a pole 12 and a connecting plate 11, the connecting plate 11 is arranged on one side of the cover plate body 4, and the pole 12 passes through the cover plate body 4 along the first direction F1 and is connected to the connecting plate 11. At least two pole assemblies are arranged in sequence along the second direction F2, and the two ends of the insulating connection part 3 in the second direction F2 are respectively provided with placement holes 31, and parts of the connecting plates 11 of two adjacent pole assemblies can be respectively arranged at the two end placement holes 31 of the insulating connection part 3 in the second direction F2 to connect the two adjacent pole assemblies.

[0043] According to the cover plate structure provided by the above-mentioned technical features, by respectively setting placement holes 31 at both ends of the insulating connecting part 3 in the second direction F2, and the parts of the connecting plates 11 of the two adjacent pole assemblies can be respectively set in the placement holes 31 at both ends of the insulating connecting part 3 in the second direction F2 to connect the two adjacent pole assemblies, so that the two adjacent pole assemblies can be mutually constrained through the insulating connecting part 3, thereby ensuring the flatness of the pole assembly, thereby effectively reducing the probability of the connecting plate 11 being warped, deformed, and having a flatness dimension deviation.

[0044] like Figures 1 to 7 As shown, F1 shown in the figure may be an example of the first direction F1, and F2 shown in the figure may be an example of the second direction F2, wherein the second direction F2 intersects the first direction F1. Preferably, the first direction F1 may be arranged perpendicular to the second direction F2 to facilitate the structure of the square shell battery. For ease of description, the direction perpendicular to the plane determined by the first direction F1 and the second direction F2 is defined as a third direction F3, and F3 shown in the figure may be an example of the third direction F3.

[0045] Preferably, if Figure 6 As shown, the above-mentioned insulating connection part 3 may also include a partition part 32, and the two placement holes 31 arranged at the two ends of the above-mentioned insulating connection part 3 in the second direction F2 are separated and not connected by the partition part 32. In this way, the two placement holes 31 at the two ends of the second direction F2 of the insulating connection part 3 can be effectively insulated through the setting of the partition part 32, so that the insulating connection part 3 can effectively insulate the two adjacent pole assemblies. In this way, the different polarities of the two adjacent pole group assemblies can be achieved through the insulating effect of the insulating connection part 3, so that the cover plate structure space can be compressed.

[0046] Optionally, the insulating connecting portion 3 may be made of a hard insulating material, such as a ceramic material, a hard plastic material, etc.

[0047] Preferably, the insulating connecting portion 3 may be made of a hard insulating material, such as PPS, PVC, etc. Preferably, the connecting plate 11 of the two adjacent pole assemblies and the insulating connecting portion 3 may be integrally injection molded to achieve a fixed connection between the connecting portions of the two adjacent pole group assemblies, thereby improving the restraining and straightening capability of the insulating connecting portion 3 on the connecting plate 11 of the two adjacent pole assemblies.

[0048] Preferably, if Figure 6 and Figure 7 As shown, the outer edge of the insulating connector is aligned with the outer edge of the connecting plate 11. In other words, the cross-sectional area of ​​the portion of the connecting plate 11 disposed in the mounting hole 31 is smaller than the cross-sectional area of ​​other portions of the connecting plate 11, so as to improve the space utilization and neatness of the cover structure and facilitate the assembly of the cover structure.

[0049] like Figures 1 to 7 An example in which the cover plate structure has two pole assemblies is shown, but it is not limited thereto, and the number of pole group assemblies can be adaptively adjusted according to the number of lead-out tabs of the battery.

[0050] For ease of description, two opposite ends of the connecting plate 11 in the second direction F2 are respectively defined as a first end and a second end, wherein the first end is an end of the connecting plate 11 away from the insulating connecting portion 3 .

[0051] Preferably, the connection plate 11 is provided with a connection hole 110 penetrating the connection plate 11 along the first direction F1, and the pole 12 penetrates the connection hole 110 and is connected to the connection plate 11. Optionally, the pole 12 may penetrate the connection hole 110 and be riveted to the connection plate 11.

[0052] Preferably, if Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in the second direction F2, the connecting hole 110 is arranged close to the first end of the connecting plate 11. Figure 2 As shown, there is enough space between the connection hole 110 and the insulating connection portion 3 for arranging the palladium sheet 15 so as to facilitate the external electrical connection of the cover structure.

[0053] Preferably, if Figure 7 As shown, the distance from the center of the connecting hole 110 to the second end of the connecting plate 11 in the second direction F2 is defined as y, wherein 20mm≤y≤50mm. On the one hand, this ensures the space for setting the palladium sheet 15 on the connecting plate 11; on the other hand, it effectively reduces the probability of deformation of the connecting plate 11 due to bending caused by being too long.

[0054] Preferably, if Figure 7 As shown, the tensile strength of the insulating connecting portion 3 is defined as , the tensile strength of the connecting plate 11 is The dimension of the hole wall of the placement hole 31 away from the cover body 4 in the first direction F1 is W 1. The portion of the connecting plate 11 disposed in the placement hole 31 is W 2. Among them, and .

[0055] See Table 1, which shows that the insulating connecting portion 3 is PPS, that is, =105MPa; the connecting plate 11 is aluminum, that is, = 95MPa ten examples:

[0056] Table 1:

[0057]

[0058] Based on the results shown in Table 1, when y satisfies 20 mm ≤ y ≤ 50 mm, there is enough space on the connecting plate 11 to place the palladium sheet 15. If the size of y is too small, welding cannot be performed. If it is too large, the riveting block material will be excessive, resulting in cost waste. When the cover plate structure satisfies and When the flatness of the connecting plate 11 is improved significantly, the flatness of the connecting plate 11 can be controlled within the range of <0.2 mm; and the restraining ability of the insulating connecting part 3 on the connecting plate 11 can be effectively guaranteed, thereby ensuring the structural stability of the insulating connecting part 3 and the supporting and restraining ability of the insulating connecting part 3 on the connecting plate 11.

[0059] Preferably, if Figure 7 As shown, the distance from the center of the connecting hole 110 to the first end of the connecting plate 11 in the second direction F2 is defined as z, and the radius of the connecting hole 110 is d, wherein z≥d+1.5mm, so as to ensure the strength of the portion of the connecting plate 11 located on the side where the first end of the connecting hole 110 is located.

[0060] Preferably, if Figure 5 As shown, the center of the connecting hole 110 is arranged on the center line of the connecting plate 11 in the third direction F3.

[0061] Define that the dimension of the connecting plate 11 in the first direction F1 is h, the thickness of the connecting plate 11 at the narrowest part of the parts on both sides of the connecting hole 110 in the third direction F3 is k, the dimension of the cover body 4 in the third direction F3 is D, and the radius of the connecting hole 110 is d, wherein 2mm≤h≤4mm, 1mm≤k≤(D-2d-2). On the one hand, h satisfies 2mm≤h≤4mm, which can effectively ensure the bending strength of the connecting plate 11; on the other hand, when the connecting plate 11 and the pole 12 are riveted, the thickness k of the narrowest part of the parts on both sides of the connecting plate 11 in the third direction F3 satisfies 1mm≤k≤(D-2d-2), which can effectively accommodate the expansion of the pole 12 during the riveting process and save the material of the cover structure.

[0062] Preferably, 2.5 mm ≤ h ≤ 4 mm, 1.5 mm ≤ k ≤ (D-2d-4), for example, the above h can be equal to 3 mm, and k can be equal to 2 mm.

[0063] Preferably, if Figure 1 and Figures 5 to 7 As shown, the pole assembly may further include a first plastic part 13, which is wrapped around the side of the connecting plate 11 facing the cover body 4, and a portion of the first plastic part 13 extends to the insulating connecting portion 3. In other words, Figure 7 As shown, the gap width (i.e. Figure 7 The b value shown) is smaller than the width of the insulating connecting portion 3 in the second direction F2 (ie Figure 7 c value shown) to ensure the insulation performance of both the connecting plate 11 and the cover body 4.

[0064] Preferably, one of the two pole assemblies is a positive pole assembly, and the other of the two pole assemblies is a negative pole assembly, so as to ensure that the cover plate structure can integrate the positive and negative electrodes of the battery, thereby improving the space utilization of the battery.

[0065] Optionally, relative to the positive electrode column assembly, the first plastic part 13 needs to satisfy the requirement that the insulation resistance is between 0.05 MΩ and 100 MΩ when 500 VDC is applied to the connecting plate 11 and the cover body 4 .

[0066] Optionally, relative to the negative pole assembly, the first plastic part 13 needs to satisfy the requirements that when 500VDC is applied to the connecting plate 11 and the cover body 4, the insulation resistance is greater than 200MΩ. And when 1000VDC is applied to the connecting plate 11 and the cover body 4, the current is less than 1mA, so as to ensure the electrical performance of the battery cell.

[0067] Preferably, if Figures 5 to 7As shown, at least a portion of the first plastic part 13 can extend to the side wall of the connecting plate 11, so that the assembly of the cover plate structure and the battery is convenient. For example, during the battery assembly process, the connecting plate 11 can be picked up by the portion of the first plastic part 13 extending to the side wall of the connecting plate 11, thereby avoiding scratches between the clamping jaws and the connecting plate 11 during the process of picking up the connecting plate 11.

[0068] Optionally, the first plastic part 13 , the insulating connecting part 3 , and the two connecting plates 11 may be integrally injection molded to further improve the restraining strength of the insulating connecting part 3 on the two connecting plates 11 .

[0069] In an embodiment, preferably, Figure 1 , Figure 3 and Figures 5 to 7 As shown, the cover plate structure may further include a second plastic part 5, which is attached to the side of the cover plate body 4 facing away from the connecting plate 11, so as to achieve insulation between the cover plate structure and the inside of the battery.

[0070] Preferably, if Figure 1 As shown, the pole 12 may include a pole body 121 and a limiting plate 122 connected to each other, the pole body 121 extends along the first direction F1, and the pole 12 passes through the connecting hole 110 via the pole body 121. The limiting plate 122 is arranged on a side of the cover body 4 facing away from the connecting plate 11 to limit the pole 12.

[0071] Preferably, if Figures 5 to 7 As shown, the above-mentioned pole assembly can also have an insulating gasket 14, which can be sleeved on the outside of the above-mentioned column body 121. The two ends of the insulating gasket 14 in the first direction F1 can be connected to the above-mentioned first plastic part 13 and the second plastic part 5 respectively to ensure the insulation of the pole assembly and the cover plate.

[0072] Preferably, if Figure 1 , Figure 2 and Figure 6 As shown, the cover body 4 may also be provided with an explosion-proof hole 41 penetrating the cover body 4 along the first direction F1. The cover structure further includes an explosion-proof valve 6, which is covered in the explosion-proof hole 41 to achieve explosion-proof safety of the cover structure.

[0073] Alternatively, if Figure 2 and Figure 6 As shown, the cover structure may further include a patch 61 , which is attached to one side of the connection plate 11 of the explosion-proof hole 41 to cover the explosion-proof hole 41 , thereby ensuring the neatness and flatness of the outer side of the cover body 4 .

[0074] The embodiment of the second aspect of the present application further provides a battery, comprising the cover plate structure of any of the above embodiments, and thus having all the beneficial technical effects of the cover plate structure, which will not be elaborated here.

[0075] Preferably, although not shown in the figures, the battery may further include a shell, and the cover structure may be covered on one side of the shell.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate structure, characterized in that: It includes a cover plate body, an insulating connecting portion and at least two pole assemblies; The pole assembly comprises a pole and a connecting plate, wherein the connecting plate is arranged on one side of the cover body, and the pole passes through the cover body along a first direction and is connected to the connecting plate; The at least two pole assemblies are arranged in sequence along the second direction, and the two ends of the insulating connection portion in the second direction are respectively provided with placement holes, and the connecting plates of two adjacent pole assemblies can be respectively arranged at the two end placement holes of the insulating connection portion in the second direction to connect the two adjacent pole assemblies, and the second direction intersects with the first direction; The insulating connection portion further includes a barrier portion, and the two placement holes disposed at both ends of the insulating connection portion in the second direction are separated and not connected via the barrier portion; The number of the pole assemblies is two, and the two pole assemblies are fixedly connected via the insulating connecting portion; The connecting plate has a first end and a second end opposite to each other in the second direction, the first end being an end of the connecting plate away from the insulating connecting portion; The connecting plate is provided with a connecting hole penetrating the connecting plate along the first direction, and the pole passes through the connecting hole and is connected to the connecting plate; In the second direction, the connecting hole is arranged near the first end of the connecting plate; The center of the connecting hole is arranged on the midline of the connecting plate in a third direction, and the third direction is perpendicular to the second direction; Define that the size of the connecting plate in the first direction is h, the thickness of the connecting plate at the narrowest part of the parts on both sides of the connecting hole in the third direction is k, the size of the cover plate body in the third direction is D, and the radius of the connecting hole is d, wherein 2mm≤h≤4mm, 1mm≤k≤(D-2d-2).

2. The cover plate structure according to claim 1, characterized in that: A distance from the center of the connecting hole to the second end of the connecting plate in the second direction is defined as y, wherein 20 mm ≤ y ≤ 50 mm.

3. The cover plate structure according to claim 2, characterized in that: The tensile strength of the insulating connection is defined as , the tensile strength of the connecting plate is The dimension of the hole wall of the placement hole away from the cover plate body in the first direction is W 1. The portion of the connecting plate disposed in the placement hole in the first direction W 2; in, and .

4. The cover plate structure according to claim 1, characterized in that: It is defined that the distance from the center of the connecting hole to the first end of the connecting plate in the second direction is z, and the radius of the connecting hole is d, wherein z≥d+1.5 mm.

5. The cover plate structure according to claim 1, characterized in that: The pole assembly further includes a first plastic part, which is wrapped around a side of the connecting plate facing the cover plate body, and a portion of the first plastic part extends to the insulating connecting portion.

6. The cover plate structure according to claim 1, characterized in that: The polarities of the two pole assemblies are different.

7. A battery, characterized in that: The invention comprises the cover plate structure according to any one of claims 1 to 6.

Images