Cover assembly and battery

Abstract

The cover plate assembly disclosed in the present application divides the cover plate spacer into two parts, namely the first spacer and the second spacer, and limits the thermal conductivity coefficients of the first spacer and the second spacer, so that the electrode lead-out piece will not melt the first spacer when welding the pole ear, and the design of the second spacer can also accelerate the conduction of welding heat, so as to further reduce the impact on the first spacer and avoid the melting of the first spacer. In addition, the original cover plate spacer is divided into two parts, and the heat resistance of the cover plate spacer is increased under the premise of ensuring that the cover plate spacer has an insulating function. The electrode lead-out piece does not need to be thickened, thereby reducing the weight and cost of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a cover plate assembly and a battery. Background Art

[0002] In related technologies, the battery cover assembly primarily consists of a terminal post, an aluminum cover, a sealing ring, an insulating spacer, and a lead-out tab. The lead-out tab is laser-welded to the battery tab to achieve electrical conductivity. However, the lead-out tab must be of a certain thickness to ensure that the insulating spacer between the lead-out tab and the aluminum cover does not melt during laser welding. This thick lead-out tab not only increases the weight and material cost of the entire battery, but also reduces battery space utilization and energy density. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problem of melting of insulating spacers in order to ensure welding of electrode lead-out sheets in existing cover plate assemblies, a cover plate assembly and a battery are proposed.

[0004] In order to solve the above technical problems, the present invention provides a cover plate assembly, which is applied to a battery, and the cover plate assembly includes: a cover plate body, a cover plate spacer and an electrode lead-out sheet stacked in sequence; the electrode lead-out sheet is used to be welded to the battery tab, wherein the cover plate spacer includes a first spacer and a second spacer, the first spacer abuts against the cover plate body, and the second spacer abuts against the electrode lead-out sheet, and the thermal conductivity coefficient of the second spacer is smaller than the thermal conductivity coefficient of the first spacer.

[0005] In some embodiments, a gap is provided between the second spacer and the electrode lead-out plate, and a heat insulating material is provided in the gap, wherein a heat conductivity coefficient of the heat insulating material is smaller than a heat conductivity coefficient of the second spacer.

[0006] In some embodiments, a plurality of bosses are provided on a side of the second spacer facing the electrode lead-out piece, and the plurality of bosses abut against the electrode lead-out piece to form the gap.

[0007] In some embodiments, the second spacer includes a plurality of second sub-spacers, and at least one of the second sub-spacers is provided with a plurality of through holes.

[0008] In some embodiments, a heat insulating material is provided in the through hole, and the heat conductivity coefficient of the heat insulating material is smaller than the heat conductivity coefficient of the second spacer.

[0009] In some embodiments, each of the second spacers is provided with a plurality of through holes, and the through holes at the same position of two adjacent second spacers are provided correspondingly.

[0010] In some embodiments, the second spacer includes a plurality of second sub-spacers, a gap is provided between two adjacent second sub-spacers, the gap contains a heat insulating material, and the heat conductivity coefficient of the heat insulating material is smaller than the heat conductivity coefficient of the second spacer.

[0011] In some embodiments, the cover body, the first spacer, and the second spacer have a pole accommodating cavity, and the pole accommodating cavity passes through the cover body, the first spacer, and the second spacer;

[0012] The cover plate assembly further includes a pole, which is accommodated in the pole accommodating cavity. One end of the pole is connected to the pole tab, and the other end protrudes from the cover plate body.

[0013] In some embodiments, a sealing ring is further provided between the cover plate body and the first spacer ring. The sealing ring is provided in the pole accommodating cavity and abuts against the pole.

[0014] In a second aspect, the present application provides a battery, comprising a battery housing having an opening, a cover assembly as described above for closing or opening the opening, and a pole core, wherein the battery housing has a receiving cavity for receiving the pole core, the receiving cavity being in communication with the opening, and the pole core being located within the receiving cavity;

[0015] The pole core has a pole tab, and the pole tab is connected to the electrode lead-out piece.

[0016] The beneficial effects of the present invention are:

[0017] The cover plate assembly disclosed in the present application divides the cover plate spacer into two parts, a first spacer and a second spacer, and limits the thermal conductivity coefficient of the first spacer and the second spacer, so that the electrode lead-out tab will not melt the first spacer when welding the tab. The design of the second spacer can also accelerate the conduction of welding heat, further reducing the impact on the first spacer and preventing the first spacer from melting. In addition, the original cover plate spacer is divided into two parts, which increases the heat resistance of the cover plate spacer while ensuring that the cover plate spacer has an insulating function. The electrode lead-out tab does not need to be thickened, thereby reducing the weight and cost of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is an exploded view of a cover plate assembly provided according to an embodiment of the present invention.

[0019] Figure 2 is a cross-sectional view of a cover plate assembly provided according to an embodiment of the present invention.

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 is an exploded view of a cover plate assembly provided according to another embodiment of the present invention.

[0022] Figure 5 is an exploded view of a cover plate assembly provided according to another embodiment of the present invention.

[0023] The reference numerals in the specification are as follows:

[0024] 10. Cover plate assembly;

[0025] 110. Cover plate body;

[0026] 120, first spacer;

[0027] 130, second spacer; 131, second sub-spacer; 132, through hole; 133, boss; 134, gap

[0028] 140, sealing ring;

[0029] 150, pole; 151, pole accommodating cavity;

[0030] 160. Electrode lead-out piece. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0032] In the related art, a battery cover assembly generally consists of a terminal post, an aluminum cover, a sealing ring, an insulating spacer, and an electrode lead-out tab. The electrode lead-out tab is connected to the battery cell tab through methods such as laser welding to achieve electrical conductivity. However, the electrode lead-out tab must be kept to a certain thickness to ensure that the insulating spacer between the electrode lead-out tab and the aluminum cover does not melt during laser welding. However, increasing the thickness of the tab lead-out not only increases the weight and material cost of the entire battery, but also reduces the battery's space utilization and energy density.

[0033] Therefore, based on the above-mentioned problems, the present application proposes a cover plate assembly, which aims to reduce the risks brought about by welding of electrode lead-out plates without changing the thickness of the entire cover plate assembly.

[0034] The present application discloses a cover plate assembly, such as Figure 1-5As shown, the cap plate assembly 10 is applied to a battery. The cap plate assembly 10 includes a cap plate body 110, a cap plate spacer (shown as solid area in the figure), and an electrode lead-out tab 160 stacked in sequence. The electrode lead-out tab 160 is used to weld to the internal tab of the battery to electrically connect the battery tab to the battery post 150 through the electrode lead-out tab 160. The cap plate spacer includes a first spacer 120 and a second spacer 130. The first spacer 120 abuts the cap plate body 110, and the second spacer 130 abuts the electrode lead-out tab 160. The thermal conductivity of the second spacer 130 is lower than that of the first spacer 120. This application divides the cover plate spacer into two parts, the first spacer 120 and the second spacer 130, and limits the thermal conductivity coefficient of the first spacer 120 and the second spacer 130, so that the electrode lead-out tab 160 will not melt the first spacer 120 when welding the tab. The design of the second spacer 130 can also accelerate the conduction of welding heat, further reducing the impact on the first spacer 120 and preventing the first spacer 120 from melting. In addition, the original cover plate spacer is divided into two parts, and the heat resistance of the cover plate spacer is increased under the premise of ensuring that the cover plate spacer has an insulating function. The electrode lead-out tab does not need to be thickened, thereby reducing the weight and cost of the battery cell.

[0035] Furthermore, the cover plate spacer can be an integral unit, wherein the first spacer 120 and the second spacer 130 are both part of the cover plate spacer. In addition, the cover plate spacer can be separated into the first spacer 120 and the second spacer 130, wherein the second spacer 130 and the first spacer 120 are two separate components, and the first spacer 120 and the second spacer 130 can be combined to form the cover plate spacer.

[0036] Specifically, as known in the relevant art, thermal conductivity refers to the amount of heat transferred through one square meter of area within a certain period of time under stable heat transfer conditions, expressed in watts per meter degree K (W / (m·K)). Here, K can be replaced by degrees Celsius). In other words, if the thermal conductivity of an object is low, less heat is transferred. Because the second spacer 130 is positioned close to the electrode lead tab 160, when the electrode lead tab 160 is welded to the electrode tab, heat is first transferred from the second spacer 130 to the first spacer 120. However, because the thermal conductivity of the second spacer 130 is lower than that of the first spacer 120, heat is difficult to transfer from the second spacer 130 to the first spacer 120. Even if some heat is transferred to the first spacer 120, it will not cause the first spacer 120 to melt, thereby reducing the risk of battery short circuits. Specifically, the risk of the spacer melting and contact between the cover body 110 and the electrode lead tab 160 is reduced.

[0037] Furthermore, in the present application, the second spacer 130 should be minimized from melting during welding of the electrode lead tab 160. Therefore, the melting point of the second spacer 130 should be greater than the welding temperature of the electrode lead tab 160. Furthermore, the length of the second spacer 130 is generally shorter than that of the first spacer 120. The length of the second spacer 130 can be the same as that of the electrode lead tab 160, and this is not limited thereto.

[0038] In the embodiments of this application, Figure 1-5 As shown, in the cover plate assembly 10 disclosed in the present application, a gap 134 may be provided between the second spacer 130 and the electrode lead-out tab 160. This gap 134 may be filled with a thermal insulation material, wherein the thermal conductivity of the thermal insulation material is less than that of the second spacer 130. By providing the gap 134 between the second spacer 130 and the electrode lead-out tab 160, the cover plate assembly 10 disclosed in the present application can further reduce the weight and cost of the cover plate assembly 10, thereby reducing the weight and cost of the entire battery and improving the energy density and space utilization of the battery. After the gap 134 is provided between the second spacer 130 and the electrode lead-out tab 160, a portion of the second spacer 130 still abuts the electrode lead-out tab 160, thereby enabling the second spacer 130 to be stacked on the electrode lead-out tab 160. Furthermore, the gap 134 may be filled with a thermal insulation material, wherein the thermal conductivity of the thermal insulation material is less than that of the second spacer 130. The purpose is to further reduce the amount of welding heat generated by the electrode lead-out tab 160 when welding the tab to the first spacer 120. During the entire tab welding process, the heat generated by welding first passes through the thermal insulation material. Because the thermal conductivity of the thermal insulation material is lower than that of the second spacer 130, the thermal insulation material within the gap 134 will block some of the heat from being transferred to the second spacer 130. Since the thermal conductivity of the second spacer 130 is lower than that of the first spacer 120, the second spacer 130 will also block most of the heat from being transferred to the first spacer 120. The layered blocking design ensures the reliability of the first spacer 120 and prevents the first spacer 120 from being melted by the heat generated when welding the tab, which could cause other risks.

[0039] Furthermore, in one embodiment of the present application, if Figure 2 and Figure 3As shown, the second spacer 130 is provided with a plurality of bosses 133 on the side facing the electrode lead tab 160. Each of the bosses 133 abuts the electrode lead tab 160 to form the gap 134. Generally, the length of the bosses 133 is between 0.1 mm and 0.5 mm, which can ensure the overall strength of the cover plate while further reducing the weight and cost of the cover plate, reducing the risk of melting of the first spacer 120, and improving the safety of the cover plate assembly 10. The position and number of the bosses 133 in this application are not limited. However, generally, there should be at least four bosses 133, and they should be arranged in a quadrilateral to better form the gap 134. Furthermore, in other embodiments of the present application, the gap 134 between the second spacer 130 and the electrode lead tab 160 can also be formed by other structures. For example, the edge of the second spacer 130 can be provided with a circle of closed protrusions that abut the electrode lead tab 160, thereby forming a receiving area that can be filled with thermal insulation material. Alternatively, the electrode lead-out piece 160 is provided with a protrusion to form a gap 134 with the second spacer 130. Alternatively, related structural members are separately provided to form the gap 134, etc., which is not further limited in this application.

[0040] In the embodiments of this application, Figure 4 and Figure 5 As shown, the second spacer 130 may further include multiple second sub-spacers 131, each of which is stacked sequentially. The cover plate assembly 10 disclosed in this application further reduces the risk of melting the first spacer 120 by providing multiple layers of second sub-spacers 131. Specifically, because the thermal conductivity of the second spacer 130 is lower than that of the first spacer 120, providing multiple layers of second sub-spacers 131 gradually reduces the heat generated by the welding tabs, thereby reducing the impact on the first spacer 120 and reducing the risk of melting the first spacer 120.

[0041] In an embodiment of the present application, there is a gap between two adjacent second sub-spacers 131, and there is a heat-insulating material in the gap. After the gap is formed between the two adjacent second sub-spacers 131, the two adjacent parts of the second sub-spacers 131 are still in contact with each other to achieve the mutual stacking of the second sub-spacers 131. The thermal conductivity coefficient of the heat-insulating material is smaller than the thermal conductivity coefficient of the second sub-spacers 131. The cover assembly 10 disclosed in the present application can further improve the heat resistance of the second spacer 130 and reduce the melting risk of the first spacer 120 through a "sandwich"-like structural design. Specifically, due to the gap and the setting of the heat-insulating material filled in the gap, the heat transfer path is more complicated than the transfer path of the single-layer second spacer 130, and due to the different thermal conductivity coefficients of different materials, the heat resistance of the second spacer 130 is further improved.

[0042] Furthermore, the gap may be 0.01 mm to 0.1 mm. The gap mentioned above is generally a tolerance caused by factors such as the manufacturing process, but the gap may also be purposefully manufactured, which is not limited in this application.

[0043] In the embodiments of this application, Figure 5 As shown, to further enhance thermal insulation, at least one second sub-spacer 131 is provided with multiple through-holes 132. This structural design aims to further reduce the weight and cost of the cover assembly 10. The through-holes 132 contain thermal insulation material. Furthermore, due to the presence of the through-holes 132, thermal insulation material can also be placed within the through-holes 132. Therefore, compared to a complete second spacer 130, a second spacer 130 with through-holes 132 filled with thermal insulation material exhibits improved heat resistance and heat resistance. When heat is transferred to the second spacer 130 with through-holes 132, it diffuses throughout the entire second spacer 130. However, due to the different materials at different locations within the second spacer 130, the heat is blocked at different efficiencies. However, due to the presence of thermal insulation material within the through-holes 132, the heat is blocked more efficiently at the through-holes 132 than at other locations, resulting in a better heat-blocking effect for the entire second spacer 130.

[0044] Furthermore, each of the multi-layer second spacers 130 is provided with a plurality of through-holes 132, and the through-holes 132 at the same position of two adjacent second spacers 130 are arranged in a corresponding manner. This structural design can further enhance the heat-insulating effect of the second spacers 130, reduce the cost and weight of the cover assembly 10, and improve the space utilization of the battery. Furthermore, the corresponding arrangement of the through-holes 132 of two adjacent second spacers 130 can also reduce the processing and manufacturing costs and difficulty of the second spacers 130. Because the through-holes 132 are arranged in a corresponding manner, the position of the through-holes 132 of each second spacer 130 is fixed. In other words, during the manufacturing process, the processing of the second spacers 130 is consistent, and the structural changes of the second spacers 130 do not need to be made, thus reducing the operational difficulty. Furthermore, the relative arrangement of the through-holes 132 also increases the accumulation thickness of the thermal insulation material within the through-holes 132. The thicker the thermal insulation material, the better its heat-insulating ability.

[0045] In other embodiments of the present application, in general application scenarios, the aforementioned thermal insulation material typically refers to air. By providing corresponding structures within the first and second spacers 120, 130, and directly assembling the first and second spacers 120, 130 after fabrication, the requirements of the present application can be met without the need for additional thermal insulation materials. Furthermore, since air has a very low thermal conductivity coefficient of only 0.024-0.031 W / m·K, it can effectively slow down heat conduction, thereby providing a better thermal insulation effect.

[0046] In the embodiment of the present application, the first spacer 120 is used to insulate the cover plate body 110 from the electrode lead 160. Therefore, the first spacer 120 is typically made of an insulating material, such as polypropylene (PP), which typically has a thermal conductivity between 0.6 and 0.7 W / m·K. The second spacer 130 is used for heat insulation and can be made of either insulating or non-insulating materials. However, the thermal conductivity of the material used for the second spacer 130 must be lower than that of the first spacer 120. Therefore, the material used for the second spacer 130 is typically ceramic or aerogel, which has a lower thermal conductivity than PP. The thermal conductivity of ceramic is below 0.5 W / m·K; the thermal conductivity of aerogel is below 0.1 W / m·K. The thermal insulation material is typically air, which has a thermal conductivity of only 0.024-0.031 W / m·K, effectively slowing down heat conduction. Of course, in other embodiments, the thermal insulation material may also be polyester resin, aerogel, silicone, or other materials.

[0047] In the embodiments of this application, Figure 1 , Figure 4 as well as Figure 5 As shown, the cover body 110, the first spacer 120, and the second spacer 130 define a pole-accommodating cavity 151, which extends through the cover body 110, the first spacer 120, and the second spacer 130. The cover assembly 10 also includes a pole 150, which is accommodated within the pole-accommodating cavity 151. One end of the pole 150 is connected to the tab, and the other end protrudes from the cover body 110. A sealing ring 140 is also provided between the cover body 110 and the first spacer 120. The sealing ring 140 is disposed within the pole-accommodating cavity 151 and abuts against the pole 150. The sealing ring 140 cooperates with the pole 150 to seal the pole-accommodating cavity 151.

[0048] On the other hand, the present application also discloses a battery, which includes a battery shell with an opening, a cover assembly 10 as described above for closing or opening the opening, and a pole core, wherein the battery shell has a housing for accommodating the pole core, the housing is connected to the opening, and the pole core is located in the housing; the pole core has a pole ear, and the pole ear is connected to the electrode lead-out piece 160. In the present invention, unless otherwise clearly specified and defined, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly is applied to a battery, and the cover plate assembly comprises: a cover plate body, a cover plate spacer and an electrode lead-out sheet stacked in sequence; the electrode lead-out sheet is used for welding with the electrode lug of the battery, wherein the cover plate spacer comprises a first spacer and a second spacer, the first spacer abuts against the cover plate body, the second spacer abuts against the electrode lead-out sheet, and the thermal conductivity coefficient of the second spacer is smaller than the thermal conductivity coefficient of the first spacer; There is a gap between the second spacer and the electrode lead-out sheet, and a heat insulating material is arranged in the gap, wherein the heat conductivity coefficient of the heat insulating material is smaller than the heat conductivity coefficient of the second spacer.

2. The cover plate assembly according to claim 1, characterized in that: A plurality of bosses are provided on a side of the second spacer facing the electrode lead-out sheet, and the plurality of bosses are all in contact with the electrode lead-out sheet to form the gap.

3. The cover plate assembly according to claim 1, characterized in that: The second spacer includes a plurality of second sub-spacers, and at least one of the second sub-spacers is provided with a plurality of through holes.

4. The cover plate assembly according to claim 3, characterized in that: A heat insulating material is arranged in the through hole, and the heat conductivity coefficient of the heat insulating material is smaller than the heat conductivity coefficient of the second spacer.

5. The cover plate assembly according to claim 3, characterized in that: Each of the second spacers is provided with a plurality of through holes, and the through holes at the same position of two adjacent second spacers are provided correspondingly.

6. The cover plate assembly according to claim 1, characterized in that: The second spacer includes a plurality of second sub-spacers, a gap is provided between two adjacent second sub-spacers, a heat insulating material is provided in the gap, and the heat conductivity coefficient of the heat insulating material is smaller than the heat conductivity coefficient of the second spacer.

7. The cover plate assembly according to claim 1, characterized in that: The cover body, the first spacer and the second spacer have a pole accommodating cavity, and the pole accommodating cavity passes through the cover body, the first spacer and the second spacer; The cover plate assembly also includes a pole, which is accommodated in the pole accommodating cavity. One end of the pole is connected to the pole ear piece, and the other end protrudes from the cover plate body.

8. The cover plate assembly according to claim 7, characterized in that: A sealing ring is further provided between the cover plate body and the first spacer ring. The sealing ring is provided in the pole accommodating cavity and abuts against the pole.

9. A battery, characterized in that: A battery case having an opening, a cover assembly as claimed in any one of claims 1 to 8 for closing or opening the opening, and a pole core, wherein the battery case has a receiving cavity for receiving the pole core, the receiving cavity is communicated with the opening, and the pole core is located in the receiving cavity; The pole core has a pole ear, and the pole ear is welded to the electrode lead sheet.

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