Cover plate arrangement and battery

Abstract

Cover plate arrangement, in particular for a battery, comprising: a cover plate having a mounting hole arranged so that it passes through the cover plate from the front to the back along the thickness direction thereof; a terminal block that is inserted into the mounting hole; a pressure plate that is sheathed on the terminal block; an insulator element provided between the pressure plate and the cover plate to separate the pressure plate from the cover plate; characterized in that the terminal block is divided into a first metal layer and a second metal layer along its thickness direction, the first metal layer is located on the front of the second metal layer, and the melting point of the first metal layer is lower than the melting point of the second metal layer, the heat transfer rate of the second metal layer is greater than the heat transfer rate of the first metal layer and is greater than the heat transfer rate of the printing plate; wherein the printing plate is welded to and fixed against the outer circumferential side of the first metal layer, so that a weld mark is formed between the printing plate and the first metal layer; and the thickness of the first metal layer is “H1”, the thickness of the second metal layer is “H2”, the depth of the weld mark is “H3”, and the above parameters are met: 0.7 ≤ H 1 H 2 × H 3 ≤ 8.

Description

TECHNICAL AREA

[0001] The present invention relates to the technical field of traction batteries or traction accumulators and in particular to a cover plate arrangement and a battery or accumulator. BACKGROUND

[0002] A traction battery is a battery that provides a power source for tools and generally comprises a metal casing, a cell housed within the metal casing, and a cover plate assembly attached to the top of the metal casing. The cover plate assembly incorporates a terminal post or connection clamp structure, which performs the power transmission function of the traction battery; therefore, the stability of the connection clamp structure itself affects the performance of the traction battery.

[0003] Currently, the conventional cover plate assembly generally comprises a cover plate, a pressure plate, a terminal post, and an insulator. The terminal is provided by insertion onto the cover plate, and the pressure plate and insulator are sheathed around the terminal. The pressure plate is welded to the terminal, preventing horizontal rotation or axial movement of the terminal. The insulator is positioned between the pressure plate and the cover plate to insulate the electrical conductor between them.

[0004] However, if the terminal block and the pressure plate are welded, the heat generated by the welding is very high, which can easily cause the insulating element to soften and lead to the problem of insulation failure. SUMMARY OF THE INVENTION

[0005] The object of the present invention is to provide a cover plate arrangement and a battery that improves the structural arrangement of the terminal block so that the terminal block can immediately dissipate the heat generated by welding, thereby avoiding the problem of insulation failure caused by softening of the insulator element.

[0006] To achieve the above objectives, the present invention provides the following technical schemes: A cover plate arrangement comprising: a cover plate having a mounting hole arranged so that it passes through the cover plate from the front to the back along the thickness direction thereof; a terminal block that is inserted into the mounting hole; a pressure plate that is sheathed on the terminal block; an insulator element provided between the pressure plate and the cover plate to separate the pressure plate from the cover plate; wherein the terminal block is divided into a first metal layer and a second metal layer along its thickness direction, the first metal layer being on the front side of the second metal layer, and the melting point of the first metal layer being lower than the melting point of the second metal layer, the heat transfer rate of the second metal layer being greater than the heat transfer rate of the first metal layer and greater than the heat transfer rate of the printing plate; wherein the pressure plate is welded to and fixed against the outer circumferential side of the first metal layer, so that a weld mark is formed between the pressure plate and the first metal layer; and the thickness of the first metal layer is “H1”, the thickness of the second metal layer is “H2”, the depth of the weld mark is “H3”, and the above parameters are satisfied: 0.7≤H1H2×H3≤8.

[0007] In some embodiments, the thickness “H1” of the first metal layer meets: 2 ≤ H1 ≤ 4 mm.

[0008] In some embodiments, the thickness “H2” of the second metal layer satisfies: 1 ≤ H2 ≤ 2 mm.

[0009] In some embodiments, the thickness “H3” of the weld mark meets: 0.4 ≤ H3 ≤ 2 mm.

[0010] In some embodiments, the back side of the second metal layer is recessed along its thickness direction towards the front side to form a recessed section.

[0011] In some embodiments, the thickness of the recessed section “H4” and the depth “H4” of the recessed section and the thickness “H2” of the second metal layer are: 0.5≤H4H2≤4.

[0012] In some embodiments, the depth “H4” of the recessed section satisfies: 1 ≤ H4 ≤ 4 mm.

[0013] In some embodiments, the interface between the first metal layer and the second metal layer is flush with the back of the printing plate, and the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark meet: 0.7≤H1H2×H3≤4.3.

[0014] In some embodiments, the interface between the first metal layer and the second metal layer is located on the front of the back of the printing plate, and the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark meet: 1,1≤H1H2×H3≤8.

[0015] In some embodiments, the shortest vertical distance in the thickness direction of the terminal block between the interface between the first metal layer and the second metal layer and the back of the printing plate “L1”, and “L1” is satisfied: 0 ≤ L1 ≤ 1.5 mm.

[0016] In some embodiments, the first metal layer consists of aluminum and the second metal layer consists of copper.

[0017] In some embodiments, the printing plate and the first metal layer are made of the same material.

[0018] In some embodiments, the shortest vertical distance in the thickness direction of the terminal block is from the connecting surface of the back of the pressure plate and the insulator element to the weld mark “L2”, and “L2” is satisfied: 0 ≤ L2 ≤ 2.5 mm.

[0019] In some embodiments, the insulator element is connected to at least part of the back of the printing plate.

[0020] In some embodiments, the insulator element is at least partially connected to the outer circumferential side of the second metal layer.

[0021] In some embodiments, the insulator element comprises: a planar section provided between the printing plate and the cover plate to separate the printing plate from the cover plate; a vertical section extending into the mounting hole and extending to the rear of the mounting hole; and wherein the vertical section is provided relative to the outer circumferential side of the second metal layer.

[0022] In some embodiments, a sealing element is further included, wherein the sealing element is provided between the cover plate and the terminal block and is provided on the back of the insulator element, and wherein the sealing element is provided at least partially in the mounting hole and is connected to the second metal layer.

[0023] In some embodiments, the projection of the insulator element on the cover plate conceals the projection of the sealing element on the cover plate.

[0024] In some embodiments, the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer, and the depth “H3” of the weld mark meet the following criteria: 1,1≤H1H2×H3≤8.

[0025] In some embodiments, the thermal deformation temperature of the insulator element is “T”, and “T” satisfies: 150°C≤T≤350°C, and the thickness “H” I “The first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark must meet: 1.5≤H1H2×H3≤8.

[0026] Based on the cover plate arrangement described above, the present application further provides a battery having a tab and any of the cover plate arrangements described above, and the tab is electrically connected to the terminal.

[0027] In some embodiments, the tab projections and the weld mark partially overlap in the thickness direction of the terminal, and the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark fulfill: 0.8≤H1H2×H3≤4.5.

[0028] The cover plate arrangement and the battery according to the embodiment of the present invention have the following advantageous effects compared to the prior art: The cover plate arrangement of the present application proposes a terminal block formed from a composite of a first and a second metal layer. The melting point of the first metal layer is lower than that of the second, and the heat transfer rate of the second metal layer is higher than that of the first and higher than that of the pressure plate. In this way, when the pressure plate is welded and fixed to the outer circumferential side of the first metal layer, the second metal layer can dissipate the heat generated by the welding process more quickly, thereby reducing the heat transferred to the insulating element and preventing overheating and softening of the insulating element. Furthermore, the thickness "H1" of the first metal layer and the thickness "H2" of the second metal layer influence the weld strength and the heat transfer rate of the terminal block.By controlling the relative ratio of the three parameters – the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer, and the depth “H3” of the weld mark – the cover plate arrangement can achieve a balanced effect between weld strength and heat transfer rate. Therefore, the cover plate arrangement exhibits both sufficient weld strength and the ability to achieve the expected heat transfer rate, while preventing the thickness “H1” of the first metal layer from being too small to negatively impact weld strength. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic diagram of the cover plate arrangement according to the embodiment of the present application; Fig. 2 is a top view of the cover plate arrangement according to the embodiment of the present application; Fig. Figure 3 is a schematic diagram of section “AA” in Fig.2; Fig. 4 is another schematic diagram of the structure from Fig. 3; Fig. 5 is another schematic diagram of the structure from Fig. 4; Fig. Figure 6 is an enlarged view of part “B” in Fig. 5.

[0029] In the characters: 100. Cover plate arrangement; 1. Cover plate; 2. Terminal block; 20. First metal layer; 21. Second metal layer; 210. Recessed section; 22. Interface; 3. Pressure plate; 4. Insulator element; 40. Planar section; 41. Vertical section; 5. Weld mark; 6. Sealing element. DETAILED DESCRIPTION OF EXECUTION FORMS

[0030] The specific embodiments of the present invention are described in more detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not used to limit the scope of protection of the present invention.

[0031] In the description of the present invention, it is understood that when an element is described as "attached to" or "provided to" another element, it may be located directly on the other element or indirectly on the other element. When an element is described as "connected" to another element, it may be directly connected to the other element or indirectly connected to the other element. The terms "installed," "connected," and "attached" are to be understood in a broad sense; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection via an intermediate medium; they may refer to the internal connection of two elements or the interaction relationship between two elements.For those skilled in the art in this field, the specific meanings of the above-mentioned terms in the present invention are understandable from the specific circumstances.

[0032] In the description of the present invention, it is to be understood that the terms "height", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", and the like, which are used in the present invention as a reference to the orientation or positional relationship, are based on the orientation or positional relationship in the drawings and serve only to expedite the description of the present invention and to simplify the description, and do not indicate or suggest that the device or element in question must have a particular orientation or must be constructed and operated in a particular orientation, and thus should not be construed as a limitation of the present invention.

[0033] In the description of the present invention, it is understood that the terms "first" and "second" used in the present invention are used for descriptive purposes only and cannot be understood as indicating a relative significance or implicitly specifying the number of the technical features mentioned. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Examples

[0034] As in the Fig.As shown in Figures 1-6, the embodiment of the present application provides a cover plate arrangement 100 suitable for a traction battery. With the output interface of the traction battery facing the front and the side opposite the front as the rear, the cover plate arrangement 100 comprises a cover plate 1, a terminal block 2, a pressure plate 3, and an insulator element 4. The cover plate 1 has a mounting hole arranged such that it extends from the front to the rear along the thickness direction of the cover plate 1. The terminal block 2 is inserted into the mounting hole such that a portion of the terminal block 2 passes through the mounting hole and extends to the front of the mounting hole. The pressure plate 3 is provided on the front of the cover plate 1 and is sheathed over the terminal block 2.The insulator element 4 is provided between the pressure plate 3 and the cover plate 1, so that the pressure plate 3 is separated from the cover plate 1.

[0035] Referring to the Fig.1-3 The terminal 2 is divided into a first metal layer 20 and a second metal layer 21 along its thickness direction. The first metal layer 20 is located on the front side of the second metal layer 21, and the melting point of the first metal layer 20 is lower than that of the second metal layer 21. The heat transfer rate (i.e., the thermal conductivity) of the second metal layer 21 is higher than that of the first metal layer 20. Furthermore, the pressure plate 3 is welded to and fixed against the outer circumferential side of the first metal layer 20, forming a weld mark 5 between the pressure plate 3 and the first metal layer 20. The thickness of the first metal layer 20 is "H1", the thickness of the second metal layer 21 is "H2", and the depth of the weld mark 5 is "H3". The above parameters satisfy: 0.7≤H1H2×H3≤8

[0036] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5, based on formula (1), can be one of the values ​​of 0.7, 0.8, 0.9, 1, 1.1, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.5, 4.6, 4.8, 5, 5.1, 5.5, 5.6, 5.8, 6, 6.1, 6.5, 6.6, 6.8, 7, 7.1, 7.5, 7.6, 7.8 and 8.

[0037] It is understood that the thickness “H1” of the first metal layer 20 refers to the maximum thickness value of the first metal layer 20 in its thickness direction, and that accordingly the thickness “H2” of the second metal layer 21 refers to the maximum thickness value of the second metal layer 21 in its thickness direction.

[0038] It should be noted that the depth "H3" of the weld mark 5 reflects the heat generated by welding the terminal 2 and the pressure plate 3. The greater the depth "H3" of the weld mark 5, the larger the weld area between the terminal 2 and the pressure plate 3, and the more heat is generated by welding these components. Since the heat transfer rate of the second metal layer 21 is greater than that of the first metal layer 20, the heat dissipation efficiency of the terminal 2 increases with the proportion of the second metal layer 21 within the terminal 2.Since the weld mark 5 is formed between the pressure plate 3 and the first metal layer 20, if the proportion of the second metal layer 21 in the terminal 2 is too large, the volume of the first metal layer 20 will also be compressed, which affects the area of ​​the weld mark 5 and further impairs the weld strength of the terminal 2 and the pressure plate 3.

[0039] By controlling the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5, the cover plate arrangement 100 can therefore achieve a balanced effect between weld strength and heat transfer rate. If the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 is greater than 8, the proportion of the first metal layer 20 in the terminal 2 is too large and the proportion of the second metal layer in the terminal 2 is too small. This will result in the heat generated by welding the pressure plate 3 and the terminal 2 not being dissipated in time, and the insulating element 4 will be easily softened by the heat, leading to insulation failure.If the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5 is less than 0.7, then the proportion of the first metal layer 20 in the terminal 2 is too small and the depth “H3” of the weld mark 5 is insufficient, which will lead to insufficient weld strength between the pressure plate 3 and the terminal 2 and will easily lead to failure of the connection between the pressure plate 3 and the terminal 2.

[0040] To verify that the structural parameters of the cover plate arrangement 100 provided in the present embodiment satisfy the above relationship, i.e., if the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 are equal, the cover plate arrangement 100 of the present embodiment can exhibit sufficient weld strength compared to other cover plate arrangements 100, 10 groups of tests were carried out, see Table 1 below: In Table 1, test examples 1 to 10 are tests based on the structure of the cover plate assembly 100 of the present embodiment. That is, in the cover plate assembly 100 of test examples 1 to 10, the width “W1” of the pressure plate 3, the thickness “t1” of the pressure plate 3, the width “W2” of the flange 21, and the thickness “t2” of the flange 21 satisfy the above-mentioned matching relationship. The comparison examples 1 and 2 are different structures of a cover plate assembly; that is, the width “W1” of the pressure plate 3, the thickness “t1” of the pressure plate 3, the width “W2” of the flange 21, and the thickness “t2” of the flange 21 of comparison examples 1 and 2 do not satisfy the above-mentioned matching relationship.

[0041] The procedure for the tensile force test is as follows: For each test, 20 batteries are used. A tensile block is mounted on the surface of terminal 2 and connected to the tensile testing machine (universal testing machine DNS-2). After the pressure ring 3 is fixed, the tensile testing machine pulls terminal 2 through the tensile block, and the machine sensor (sensor model CLY30) is activated to record the tensile force value of the tensile block until terminal 2 drops. The maximum value in the tensile force curve is read, and any value above 1200 is considered qualified.

[0042] The procedure for testing thermal conductivity is as follows: For each test, 20 batteries are used, and a power source (RDTS-02) is placed on the top and bottom of the terminal block. A thermometer (LR8450) is placed on the bottom of the terminal block. A current of 500A is applied, and after 1 minute, the temperature is recorded via the thermometer. If the temperature exceeds 60 degrees Celsius, the test is considered unqualified. Table 1 H1 (Unit: mm) H2 (unit: mm) H3 (Unit: mm) H1H2×H3≤8 Traction force value (N) Success rate of thermal conductivity (%) Test example 1 2,5 1,8 2 0,69 1250 100% Test example 2 4 1 0,5 8,00 2005 100% Test example 3 2 2 0,8 1,25 1530 100% Test example 4 2,5 1,5 0,4 4,17 1760 100% Test example 5 3,8 1,1 0,8 4,32 1800 100% Test example 6 3,1 1,2 1,1 2,35 1680 100% Test example 7 2,8 1,1 1,7 1,50 1570 100% Test example 8 3,6 1,7 1,9 1,11 1450 100% Comparison example 1 2 2 2 0,50 1000 100% Comparison example 2 4 1 0,4 10,00 2180 70%

[0043] As can be seen from Table 1, if the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 satisfy the above corresponding relationship, the terminal 2 of the cover plate assembly can withstand a tensile force of more than 1200 and ensure that no air escapes. If the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 do not satisfy the above corresponding relationship, this type of cover plate assembly will have the problem that the tensile force or the airtightness that the terminal 2 can withstand will be insufficient.

[0044] When the pressure plate 3 is welded to the terminal 2, the weld originates from the front of the terminal 2 near the intersection of the pressure plate 3 and the first metal layer 20, thus welding and fixing the pressure plate 3 and the first metal layer 20. Since the melting point of the second metal layer 21 is higher than that of the first metal layer 20, the second metal layer 21 does not melt during the welding and fixing process, thereby ensuring the stability of the overall structure of the terminal 2 and the stable connection between the terminal 2 and the cell.

[0045] It is understood that the first metal layer 20 and the second metal layer 21 can be selected according to the specification parameters of terminal 2. Considering the applicability of laser welding, for example, the first metal layer 20 can be made of aluminum and the second metal layer 21 can be made of copper. Additionally, the pressure plate 3 can be made of the same material as the first metal layer 20, which is advantageous for the welding process and temperature control during welding. For example, if the first layer is made of aluminum, the pressure plate 3 can also be made of aluminum.

[0046] The heat generated by welding is transferred outwards through the pressure plate 3 and the first metal layer 20. During this heat transfer process, the heat transfer rate of the second metal layer 21 is greater than that of the first metal layer 20 and greater than that of the pressure plate 3. Furthermore, the second metal layer 21 is a structural layer of metal material whose heat transfer rate must be much higher than that of the insulating element 4. In this way, more of the heat generated by welding is transferred to the second metal layer 21, allowing it to dissipate the heat generated by welding quickly. This prevents excessive heat transfer to the insulating element 4, which would cause it to overheat, soften, and impair its insulating effect.

[0047] It should be noted that the shape of the insulator element 4 is varied and can be an integrated or a split structure. The insulator element 4 is arranged wholly or partially horizontally between the cover plate 1 and the pressure plate 3, so that the cover plate 1 and the pressure plate 3 can be separated. According to the specification parameters of the pressure plate 3 and the insulator element 4, the width of the insulator element 4 itself is not necessarily equal to the width of the pressure plate 3. The width of the insulator element 4 can be smaller than the width of the pressure plate 3, so that the insulator element 4 is connected to part of the back surface of the pressure plate 3. Alternatively, as shown in Fig.Figure 3 shows, as an example of the present embodiment, the width of the insulator element 4 is greater than or equal to the width of the pressure plate 3, so that the insulator element 4 is connected to the back of the pressure plate 3 as a whole.

[0048] In traction batteries, the thickness and diameter of terminal 2 have corresponding standard sizes, so that the thickness “H1” of the first metal layer 20 and the thickness “H2” of the second metal layer 21 mutually influence each other. If the thickness “H1” of the first metal layer 20 is large, even though the weld strength between terminal 2 and the pressure plate 3 is ensured, the thickness “H2” of the second metal layer 21 will be correspondingly small, which impairs the rapid heat dissipation; conversely, if the thickness “H2” of the second metal layer 21 is large, even though the heat transfer rate of terminal 2 is ensured, the thickness “H1” of the first metal layer 20 will be correspondingly small, which leads to a corresponding reduction in the depth of the weld mark 5 and impairs the weld strength between terminal 2 and the pressure plate 3.Therefore, the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5 should meet a certain range value and satisfy the corresponding ratio relationship.

[0049] For example, the thickness “H1” of the first metal layer 20 can satisfy: 2 ≤ H1 ≤ 4 mm, so that the first metal layer 20 has a sufficient thickness. This ensures that when welding the pressure plate 3 and the first metal layer 20, the resulting weld mark 5 has a sufficient depth. For example, the thickness “H1” of the first metal layer 20 can be one of the following dimensions: 2 mm, 2.5 mm, 3 mm, 3.5 mm, and 4 mm.

[0050] Alternatively, the thickness “H2” of the second metal layer 21 can satisfy the following: 1 ≤ H2 ≤ 2 mm, ensuring that the second metal layer 21 has a sufficient thickness. This ensures that the terminal block 2 can dissipate the heat generated by welding in a timely manner. For example, the thickness “H2” of the second metal layer 21 can be one of the following dimensions: 1 mm, 1.5 mm, or 2 mm.

[0051] Alternatively, the depth "H3" of the weld mark 5 can be: 0.4 ≤ H3 ≤ 2 mm, to ensure that there is sufficient welding surface between the pressure plate 3 and the terminal 2. This ensures that the pressure plate 3 and the terminal 2 are firmly connected. For example, the depth "H3" of the weld mark 5 can be one of the following dimensions: 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, and 2 mm.

[0052] When the heat generated by welding is transferred to the second metal layer 21, the second metal layer 21 should have a certain heat dissipation effect so that the second metal layer 21 can maintain a certain temperature difference with the first metal layer 20 and the pressure plate 3 to ensure the heat transfer efficiency.

[0053] Referring to Fig.As an example of the present embodiment, the cover plate arrangement 100 can further comprise a sealing element 6, which is provided between the cover plate 1 and the terminal block 2 and is arranged on the rear side of the insulator element 4. The sealing element 6 is provided at least partially in the mounting hole and connected to the second metal layer 21, so that the outer circumferential side of the second metal layer 21 can be sealed by the sealing element 6 to meet the sealing requirements between the terminal block 2 and the cover plate 1.The dimension of the sealing element 6 can be designed according to the dimension of the insulator element 4, so that the projection of the insulator element 4 on the cover plate 1 can cover the projection of the sealing element 6 on the cover plate 1, so that the insulator element 4 and the sealing element 6 can work together, so that the cover plate arrangement can achieve 100 times better sealing and insulating effects.

[0054] Generally, the area in the same welding direction as the weld mark 5 is more susceptible to heat than other areas. The position where the sealing element 6 contacts the terminal 2 is likely to cause the sealing element 6 to melt, leading to seal failure. To address this, the ratio between the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 can be adjusted according to the following formula to reduce the effects of the heat generated by welding on the sealing element 6: 1,1≤H1H2×H3≤8

[0055] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5, based on formula (2), can be one of the values ​​1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.5, 4.6, 4.8, 5, 5.1, 5.5, 5.6, 5.8, 6, 6.1, 6.5, 6.6, 6.8, 7, 7.1, 7.5, 7.6, 7.8 and 8.

[0056] Referring to Fig. 4, as a further example of the present embodiment, is the reverse side of the second metal layer 21 is recessed along its thickness direction towards the front side to form a recessed section 210, so that the second metal layer 21 forms an outer contour structure which is in the shape of “ " resembles. The hollow structure formed by the recessed section 210 can effectively expand the heat dissipation area where the second metal layer 21 intersects with the outside in order to dissipate the heat of the second metal layer 21 in a timely manner.

[0057] It is understood that the thickness "H2" of the second metal layer 21 influences the heat transfer rate of the second metal layer 21. The greater the thickness "H2" of the second metal layer 21, the more heat the second metal layer 21 can absorb, and the more heat it must dissipate. Similarly, the depth of the recessed section 210 influences the heat dissipation performance of the second metal layer 21. The greater the depth of the recessed section 210, the larger the heat dissipation area extended by the second metal layer 21, and its heat dissipation performance is correspondingly improved. Naturally, the depth of the recessed section 210 also affects the dimensions of the second metal layer 21 itself, i.e., it influences the structural strength of the second metal layer 21.Therefore, the thickness “H2” of the second metal layer 21 and the depth of the recessed section 210 should be considered to be within a reasonable range. For example, a thickness of the recessed section 210 “H4” and a depth “H4” of the recessed section 210 and a thickness “H2” of the second metal layer 21 satisfy: 0.5≤H4H2≤4

[0058] Alternatively, the depth “H4” of the recessed section 210 satisfies: 1 ≤ H4 ≤ 4 mm to ensure that the thickness “H2” of the second metal layer 21 and the depth “H4” of the recessed section 210 are identical. This allows the heat absorbed by the second metal layer 21 to be dissipated through the recessed section 210 in a timely manner, thus preventing the accumulation of heat in the second metal layer 21 near the first metal layer 20, since the recessed section 210 is too small to cause heat-induced shrinkage of the separator between the first metal layer 20 and the second metal layer 21. For example, the depth “H4” of the recessed section 210 can be one of the dimensions of 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm and 4 mm.

[0059] For example, the ratio of the thickness “H4” of the recessed section 210 to the thickness “H2” of the second metal layer 21, based on formula (3), can be one of the values ​​of 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8 and 4.

[0060] Since the pressure plate 3 is located on the front of the cover plate 1, the insulating element 4, positioned between the pressure plate 3 and the cover plate 1, is generally attached to the back of the pressure plate 3, ensuring direct contact between the insulating element 4 and the pressure plate 3. If the second metal layer 21 is located far from the pressure plate 3 or has no contact with it, the heat absorbed by the pressure plate 3 will be transferred to the insulating element 4, potentially leading to overheating of the insulating element 4. Therefore, the relative position of the second metal layer 21 and the pressure plate 3 must be considered to ensure that the heat from the pressure plate 3 is dissipated to the second metal layer 21 in a timely manner.

[0061] Referring to Fig.4 as an example of the present embodiment, the interface 22 between the first metal layer 20 and the second metal layer 21 is flush with the back of the printing plate 3, and the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5 satisfy: 0.7≤H1H2×H3≤4.3

[0062] It is understood that the interface 22 between the first metal layer 20 and the second metal layer 21 is flush with the back of the printing plate 3, thus placing the second metal layer 21 close to the printing plate 3. When the heat energy diffuses from the weld mark 5 to the back, more heat energy diffuses to the second metal layer 21 in this way, so that the heat from the printing plate 3 can be dissipated to the second metal layer 21 in a timely manner.

[0063] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5, based on formula (4), can be one of the values ​​of 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.2 and 4.3.

[0064] Referring to Fig. 5 as a further example of the present embodiment, the interface 22 between the first metal layer 20 and the second metal layer 21 is alternatively arranged on the front of the back of the printing plate 3, so that the second metal layer 21 can form direct contact with the printing plate 3 and the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5 satisfy: 1,1≤H1H2×H3≤8

[0065] It is understood that the interface 22 between the first metal layer 20 and the second metal layer 21 is located on the front of the back of the printing plate 3, so that the second metal layer 21 is in direct contact with the printing plate 3. In this way, when the heat energy diffuses from the weld mark 5 to the back, more heat energy diffuses to the second metal layer 21, so that the heat from the printing plate 3 can be dissipated to the second metal layer 21 in a timely manner.

[0066] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5, based on formula (5), can be one of the values ​​1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.5, 4.6, 4.8, 5, 5.1, 5.5, 5.6, 5.8, 6, 6.1, 6.5, 6.6, 6.8, 7, 7.1, 7.5, 7.6, 7.8 and 8.

[0067] The thickness “H1” of the first metal layer 20 and the thickness “H2” of the second metal layer 21 determine the interface position between the first metal layer 20 and the second metal layer 21. In the thickness direction of the terminal 2, the shortest vertical distance between the interface 22 (i.e., the interface position) of the first metal layer 20 and the second metal layer 21 and the back of the printing plate 3 can reflect the area of ​​direct contact between the printing plate 3 and the second metal layer 21 and the area of ​​direct contact between the printing plate 3 and the first metal layer 20.If the shortest vertical distance between the interface 22 of the first metal layer 20 and the second metal layer 21 and the back of the pressure plate 3 is too small, the second metal layer 21 may not be able to dissipate the heat generated by the welding in a timely manner; if the shortest vertical distance between the interface 22 of the first metal layer 20 and the second metal layer 21 and the back of the pressure plate 3 is too large, the contact area between the first metal layer 20 and the pressure plate 3 may be insufficient, which impairs the weld strength. Therefore, in the thickness direction of the terminal 2, the shortest vertical distance between the interface 22 of the first metal layer 20 and the second metal layer 21 and the back of the pressure plate 3 is “L1”, and “L1” can be considered to satisfy the following conditions: 0 ≤ L1 ≤ 1.5 mm.For example, the shortest vertical distance between the interface 22 of the first metal layer 20 and the second metal layer 21 and the back of the printing plate 3 is “L1”, which can be one of the dimensions of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm and 1.5 mm.

[0068] In addition to adjusting the relative positional ratio between the second metal layer 21 and the pressure plate 3, the relative positional ratio between the insulating element 4 and the second metal layer 21 can also be adjusted so that the heat absorbed by the insulating element 4 itself can be dissipated by the second metal layer 21 in a timely manner. For example, the insulating element 4 is at least partially connected to the outer circumferential side of the second metal layer 21.

[0069] Referring to Fig.As an example of the present embodiment, the insulator element 4 can comprise a planar section 40 and a vertical section 41. The planar section 40 is provided between the pressure plate 3 and the cover plate 1 to separate the pressure plate 3 and the cover plate 1; the vertical section 41 extends into the mounting hole and towards the rear of the mounting hole; additionally, the vertical section 41 is provided relative to the outer circumferential side of the second metal layer 21, which is to be joined to the second metal layer 21.

[0070] Of course, the insulator element 4 can also be designed with other shapes and contours according to the specifications of the cover plate arrangement 100 itself, so that part of the structure of the insulator element 4 itself can be connected to the outer circumferential side of the second metal layer 21. In this way, the insulator element 4 is directly connected to the second metal layer 21, so that the insulator element 4 can conduct heat with the second metal layer 21.

[0071] It is understood that the temperature resistance of the insulator element 4 also affects the performance of the terminal 2. The better the temperature resistance of the insulator element 4, the lower the probability that it will soften when the terminal 2 is welded to the pressure plate 3. Accordingly, the thickness of the second metal layer 21 of the terminal 2 can also be reduced. As an example of the present embodiment, the thermal deformation temperature of the insulator element 4 is "T", and "T" satisfies: 150°C ≤ T ≤ 350°C. In this case, the thickness "H1" of the first metal layer 20, the thickness "H2" of the second metal layer 21, and the depth "H3" of the weld mark 5 can satisfy: 1.5≤H1H2×H3≤8

[0072] It is understood that the thermal deformation temperature “T” of the insulator element 4 reflects the thermal resistance of the insulator element 4. The better the thermal resistance of the insulator element, the greater the welding heat that can be generated by the pressure plate 3 and the terminal 2, and the greater the depth “H3” of the weld mark 5, thus improving the bond strength between the pressure plate 3 and the terminal 2. For example, the thermal deformation temperature “T” of the insulator element 4 can be one of the values ​​150°C, 175°C, 200°C, 250°C, 275°C, 300°C, 325°C, and 350°C.

[0073] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21 and the depth “H3” of the weld mark 5, based on formula (6), can be one of the values ​​of 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.5, 4.6, 4.8, 5, 5.1, 5.5, 5.6, 5.8, 6, 6.1, 6.5, 6.6, 6.8, 7, 7.1, 7.5, 7.6, 7.8 and 8.

[0074] In addition to the fact that the heat dissipation performance of terminal 2 influences the heat absorbed by insulator element 4, the weld mark 5 is the area directly affected by the welding process and is generally the area with the highest temperature. If the weld mark 5 is too close to insulator element 4, the heat absorbed by insulator element 4 also increases, causing it to soften. Referring to Fig.6 is therefore, as an example of the present embodiment, in the thickness direction of the terminal 2, the shortest vertical distance from the connecting surface between the back of the pressure plate 3 and the insulator element 4 to the weld mark 5 “L2”, and “L2” satisfies: 0 ≤ L2 ≤ 2.5 mm. For example, the shortest vertical distance “L2” from the connecting surface between the back of the pressure plate 3 and the insulator element 4 to the weld mark 5 can be one of the dimensions of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm and 2.5 mm.

[0075] Based on the cover plate arrangement 100 mentioned above, the present embodiment also provides a battery (not shown) which has a tab (not shown) and any of the cover plate arrangements 100 described above, wherein the tab is provided on the back of the cover plate 1 near the second metal layer 21 and is electrically connected to the terminal 2.

[0076] Considering that the tab may be located behind weld mark 5, the tab projection and weld mark 5 overlap in the thickness direction of the terminal 2. In this case, the heat generated by welding may affect the tab. Therefore, the thickness "H1" of the first metal layer 20, the thickness "H2" of the second metal layer 21, and the depth "H3" of weld mark 5 can be adjusted according to the following formula to increase the thickness of the second metal layer 21, thus enabling it to dissipate heat quickly: 0.8≤H1H2×H3≤4.5

[0077] For example, the ratio of the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5, based on formula (7), can be one of the values ​​of 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2, 2.1, 2.5, 2.6, 2.8, 3, 3.1, 3.5, 3.6, 3.8, 4, 4.1, 4.5, 4.6, 4.8, 5, 5.1, 5.5, 5.6, 5.8, 6, 6.1, 6.5, 6.6, 6.8, 7, 7.1, 7.5, 7.6, 7.8, and 8 be.

[0078] In summary, the embodiment of the present application provides a cover plate arrangement 100 and a battery. In this embodiment, a terminal 2 is formed from a composite of a first metal layer 20 and a second metal layer 21. The melting point of the first metal layer 20 is lower than that of the second metal layer 21, and the heat transfer rate of the second metal layer 21 is higher than that of the first metal layer 20 and higher than that of the pressure plate 3. Thus, when the pressure plate 3 is welded and fixed to the outer circumferential side of the first metal layer 20, the second metal layer 21 can dissipate the heat generated by the welding more quickly, thereby reducing the heat transferred to the insulation. The heat from the edge element 4 is used to prevent the insulator element 4 from overheating and softening.Furthermore, the thickness “H1” of the first metal layer 20 and the thickness “H2” of the second metal layer 21 influence the weld strength and the heat transfer rate of the terminal 2. By controlling the relative ratio of the three parameters – the thickness “H1” of the first metal layer 20, the thickness “H2” of the second metal layer 21, and the depth “H3” of the weld mark 5 – the cover plate assembly 100 can achieve a balanced effect between weld strength and heat transfer rate, ensuring that the cover plate assembly 100 has sufficient weld strength and can achieve the expected heat transfer rate.

[0079] The above is only one preferred embodiment of the present invention. It should be noted that, for a person skilled in the art, several improvements and substitutions could be made without departing from the technical principle of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

[1] Cover plate arrangement, in particular for a battery, comprising: a cover plate having a mounting hole arranged so that it penetrates the cover plate from the front to the back along the thickness direction thereof; a terminal block that is inserted into the mounting hole; a pressure plate that is sheathed on the terminal block; an insulator element provided between the pressure plate and the cover plate to separate the pressure plate from the cover plate; characterized by , that the terminal block is divided into a first metal layer and a second metal layer along its thickness direction, the first metal layer is located on the front of the second metal layer, and the melting point of the first metal layer is lower than the melting point of the second metal layer, the heat transfer rate of the second metal layer is greater than the heat transfer rate of the first metal layer and is greater than the heat transfer rate of the printing plate; wherein the printing plate is welded to and fixed against the outer circumferential side of the first metal layer, so that a weld mark is formed between the printing plate and the first metal layer; and the thickness of the first metal layer is “H1”, the thickness of the second metal layer is “H2”, the depth of the weld mark is “H3”, and the above parameters are met: 0.7≤H1H2×H3≤8. [2] Cover plate arrangement according to claim 1, characterized by, that the thickness “H1” of the first metal layer is satisfied: 2 ≤ H1 ≤ 4 mm. [3] Cover plate arrangement according to one of the preceding claims, characterized by , that the thickness “H2” of the second metal layer fulfills: 1 ≤ H2 ≤ 2 mm. [4] Cover plate arrangement according to one of the preceding claims, characterized by , that the depth “H3” of the weld mark is met: 0.4 ≤ H3 ≤ 2 mm. [5] Cover plate arrangement according to one of the preceding claims, characterized by , that the back of the second metal layer is recessed along its thickness direction towards the front to form a recessed section. [6] Cover plate arrangement according to claim 5, characterized by , that the depth of the recessed section is “H4” and that the depth “H4” of the recessed section and the thickness “H2” of the second metal layer are satisfied: 0.5≤H4H2≤4. [7] Cover plate arrangement according to claim 5 or 6, characterized by, that the depth “H4” of the recessed section is satisfied: 1 ≤ H4 ≤ 4 mm. [8] Cover plate arrangement according to one of the preceding claims, characterized by , that the interface between the first metal layer and the second metal layer is flush with the back of the printing plate, and that the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark are met: 0.7≤H1H2×H3≤4.

3. [9] Cover plate arrangement according to one of the preceding claims, characterized by , that the interface between the first metal layer and the second metal layer is located on the front of the back of the printing plate, and that the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark are satisfied: 1,1≤H1H2×H3≤8. [10] Cover plate arrangement according to claim 9, characterized by, that in the thickness direction of the terminal block the shortest vertical distance between the interface between the first metal layer and the second metal layer and the back of the printing plate is “L1”, and “L1” satisfies: 0 ≤ L1 ≤ 1.5 mm. [11] Cover plate arrangement according to one of the preceding claims, characterized by that the first metal layer consists of aluminum and the second metal layer consists of copper. [12] Cover plate arrangement according to one of the preceding claims, characterized by that the printing plate and the first metal layer are made of the same material. [13] Cover plate arrangement according to one of the preceding claims, characterized by that the insulator element is connected to at least part of the back of the printing plate. [14] Cover plate arrangement according to one of the preceding claims, characterized by, that in the thickness direction of the terminal block the shortest vertical distance from the connecting surface of the back of the pressure plate and the insulator element to the weld mark “L2”, and that “L2” satisfies: 0 ≤ L2 ≤ 2.5 mm. [15] Cover plate arrangement according to claim 14, characterized by that the insulator element is connected to at least part of the back of the printing plate. [16] Cover plate arrangement according to claim 15, characterized by , that the insulator element includes: a planar section provided between the printing plate and the cover plate to separate the printing plate from the cover plate; a vertical section extending into the mounting hole and extending to the rear of the mounting hole; and wherein the vertical section is provided relative to the outer circumferential side of the second metal layer. [17] Cover plate arrangement according to one of the preceding claims, characterized by, that it further comprises a sealing element, wherein the sealing element is provided between the cover plate and the terminal block and is provided on the back of the insulator element, and wherein the sealing element is provided at least partially in the mounting hole and is connected to the second metal layer. [18] Cover plate arrangement according to claim 17, characterized by , that the projection of the insulator element on the cover plate conceals the projection of the sealing element on the cover plate. [19] Cover plate arrangement according to claim 17 or 18, characterized by , that the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer, and the depth “H3” of the weld mark are met: 1,1≤H1H2×H3≤8. [20] Cover plate arrangement according to one of the preceding claims, characterized by, that the thermal deformation temperature of the insulator element is “T”, and “T” satisfies: 150°C≤T≤350°C, and the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer, and the depth “H3” of the weld mark satisfy: 1.5≤H1H2×H3≤8. [21] Battery, characterized by , comprising a tab and a cover plate arrangement according to one of claims 1-19, wherein the tab is provided on the back of the cover plate near the second metal layer and is electrically connected to the terminal block. [22] Battery according to claim 21, characterized by , that the projection of the tab and the weld mark overlap in the thickness direction of the terminal block, and meet the thickness “H1” of the first metal layer, the thickness “H2” of the second metal layer and the depth “H3” of the weld mark: 0.8≤H1H2×H3≤4.5.

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