Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a first insulating part and a conductive pole, the conductive pole comprises a pole main body, a pole bottom plate and an insulating heat conduction part, the pole bottom plate comprises a fusing structure with a mounting through groove, a first connecting plate and a second connecting plate, the fusing structure is arranged between the first connecting plate and the second connecting plate, the insulating heat conduction piece is embedded in the mounting through groove, the length size of the insulating heat conduction piece in the first direction is H, the thickness size of the insulating heat conduction piece in the second direction is T1, the sectional area of the fusing structure split in the first direction is S, and the condition that H * T1 is larger than or equal to 9 mm < 2 > and smaller than or equal to S. On one hand, the insulation heat conduction piece is used for increasing the integrity degree of the pole bottom plate and increasing the heat dissipation area, on the other hand, the insulation heat conduction piece with better heat conductivity is used for improving the heat dissipation performance, the heat dissipation speed of the pole bottom plate is increased, and the situation that the first insulation piece is heated, melted and deformed due to the fact that the temperature of the pole bottom plate is too high is avoided.

Description

Technical Field

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

[0002] As an important part of a lithium battery, the structural design of the battery cover plate not only affects the basic performance of the battery, such as capacity and charge-discharge efficiency, but also directly relates to the safety and long-term reliability of the battery. The main structural components of the battery cover plate include conductive electrode posts, light aluminum plates, plastic parts, explosion-proof valves, etc.

[0003] Among them, since there is a risk of short circuit inside the battery, in order to provide safety protection for the battery and avoid the danger caused by short circuit, a fusing structure is usually provided on the bottom plate where the electrode post is welded to the ear. When a short circuit occurs, the fusing structure can be melted by the high temperature during the short circuit, so that the electrode post bottom plate is divided into two independent parts connected to the conductive electrode post and the ear respectively, thereby realizing the disconnection between the electrode post and the ear, timely disconnecting the connection between the inside and the outside of the battery, and preventing the further violent reaction of the electrode group.

[0004] In order to avoid direct contact between the electrode post bottom plate and the light aluminum plate to cause a short circuit, a plastic part for insulation is usually provided between the electrode post bottom plate and the light aluminum plate. However, after the fusing structure is provided on the electrode post bottom plate, compared with the bottom plate made of an integral metal plate, its heat dissipation ability is poor. When laser welding operation is carried out on the electrode post bottom plate and the ear, the temperature of the electrode post bottom plate is too high, resulting in a large amount of heat being transferred to the plastic part in contact with the electrode post bottom plate, causing the plastic part to be deformed and extended in the horizontal direction. This not only increases the probability of the plastic part being punctured due to the reduction in thickness, has a high short-circuit risk and poor insulation protection, but also changes the external dimension of the battery cover plate due to the deformation of the plastic part, making it difficult to insert the battery cover plate into the battery case during assembly, and the assembly processability is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery cover plate and a battery with strong insulation protection and good assembly processability.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, a battery cover plate is provided, and the battery cover plate includes:

[0008] A first insulating part, and an insertion through hole is formed on the first insulating part;

[0009] The conducting electrode post, the conducting electrode post includes a post body, a post bottom plate and an insulating and heat-conducting member. The post body is inserted into the insertion through hole. The post bottom plate includes a fusing structure, a first connecting plate and a second connecting plate. The fusing structure is provided with an installation through groove and is arranged between the first connecting plate and the second connecting plate. The first connecting plate is connected to the post body. The side of the second connecting plate facing away from the first insulating member is welded to the tab. The insulating and heat-conducting member is embedded in the installation through groove;

[0010] The length dimension of the insulating and heat-conducting member in the first direction is H, the thickness dimension of the insulating and heat-conducting member in the second direction is T1, and the cross-sectional area of the fusing structure cut along the first direction is S, and it satisfies 9mm 2 ≤H×T1≤S.

[0011] Optionally, the thickness dimension of the fusing structure in the second direction is T, and the thickness dimension T1 of the insulating and heat-conducting member in the second direction satisfies 1.5mm≤T1≤T.

[0012] Optionally, the length dimension of the installation through groove in the first direction is L, and the length dimension of the fusing structure in the first direction is W, and it satisfies 3mm≤(W - L) / 2≤7mm.

[0013] Optionally, the battery cover plate further includes a heat-conducting patch, the heat-conducting patch is attached to the side of the post bottom plate where it is welded to the tab, and part of the heat-conducting patch covers the first connecting plate, the second connecting plate and the fusing structure.

[0014] Optionally, the projected area of the heat-conducting patch in the second direction on the first connecting plate is larger than the projected area of the heat-conducting patch in the second direction on the second connecting plate.

[0015] Optionally, the first insulating member is further provided with a receiving groove, and the first connecting plate, the second connecting plate and the fusing structure are all accommodated in the receiving groove.

[0016] Optionally, the receiving groove includes a groove bottom wall opposite to the fusing structure in the second direction and two inner side walls opposite to each other in the first direction. A plurality of limiting protrusions abutting against the post bottom plate are symmetrically distributed on the two inner side walls.

[0017] Optionally, the battery cover plate further includes an insulating rubber sleeve, the insulating rubber sleeve is sleeved on the outside of the fusing structure, and the insulating rubber sleeve includes a rubber sleeve body, and the rubber sleeve body is arranged between the groove bottom wall and the fusing structure.

[0018] Optionally, the insulating rubber sleeve further includes rubber sleeve side plates connected to both sides of the rubber sleeve body along the first direction, and the rubber sleeve side plates are disposed between the inner side wall and the fusing structure.

[0019] On the other hand, a battery is provided, which includes a battery cell group, a battery housing, and the battery cover plate according to any one of the above. The battery housing is a cavity structure with an opening, and the battery cover plate is disposed at the opening of the battery housing to close the battery housing, so as to form a receiving cavity for receiving the battery cell group.

[0020] Advantages of the present invention:

[0021] The present invention provides a battery cover plate. By providing an installation through groove in the fusing structure of the pole post bottom plate and embedding an insulating heat-conducting member in the installation through groove, on the one hand, the integrity of the pole post bottom plate is increased by the insulating heat-conducting member, and the heat dissipation area is enlarged. On the other hand, the insulating heat-conducting member with better heat conductivity is used to improve the heat dissipation performance. Thus, the heat dissipation speed of the pole post bottom plate is improved through the mutual cooperation of the two aspects, and it is avoided that the first insulating member in contact with the pole post bottom plate is melted and deformed due to the too high temperature of the pole post bottom plate, thereby reducing the thermal influence of the high temperature during the welding operation on the first insulating member, enhancing the insulation protection performance, improving the assembly processability, and limiting the length dimension H of the insulating heat-conducting member along the first direction, the thickness dimension T1 of the insulating heat-conducting member along the second direction, and the cross-sectional area S of the fusing structure cut along the first direction, so that the three satisfy 9mm 2 ≤H×T1≤S. Thus, on the one hand, it is avoided that the area of the insulating heat-conducting member is too small, resulting in poor heat conduction effect. On the other hand, it is avoided that the area of the insulating heat-conducting member is too large, thus exceeding the pole post bottom plate and occupying the working space during the welding of the pole ear and the pole post bottom plate, resulting in compression of the available welding area between the pole ear and the pole post bottom plate and reducing the connection strength after welding.

[0022] The present invention also provides a battery. By applying the above battery cover plate, the probability of short circuit is reduced, the product quality is improved, and due to the improvement of the assembly processability, the assembly speed is greatly increased, the assembly cycle is shortened, and the production capacity is improved. Description of the Drawings

[0023] Figure 1 is an exploded view of the structure of the battery cover plate provided by the present invention;

[0024] Figure 2 is Figure 1 an enlarged view of the structure of part A in

[0025] Figure 3 is a partial cross-sectional view of the structure of the battery cover plate provided by the present invention;

[0026] Figure 4 It is a three-dimensional assembly schematic diagram of the conductive electrode post and the insulating rubber sleeve in the battery cover plate provided by the present invention;

[0027] Figure 5 It is a planar assembly schematic diagram of the conductive electrode post and the insulating rubber sleeve in the battery cover plate provided by the present invention;

[0028] Figure 6 It is a structural schematic diagram of the conductive electrode post in the battery cover plate provided by the present invention;

[0029] Figure 7 It is a structural schematic diagram of the top of the first insulating part in the battery cover plate provided by the present invention.

[0030] In the figure:

[0031] 1. First insulating part; 11. Insertion through hole; 12. Positioning protrusion; 13. Accommodating groove; 14. Limiting protrusion; 15. Bottom wall of the groove; 16. Inner side wall;

[0032] 2. Conductive electrode post; 21. Main body of the electrode post; 22. Electrode post bottom plate; 221. Fusing structure; 222. First connecting plate; 223. Second connecting plate; 224. Installation through slot; 23. Insulating and heat-conducting part;

[0033] 3. Cover plate body; 31. Connecting through hole; 32. Positioning through hole;

[0034] 4. Second insulating part;

[0035] 5. Connecting block;

[0036] 6. Heat-conducting patch;

[0037] 7. Insulating rubber sleeve; 71. Main body of the rubber sleeve; 72. Rubber sleeve side plate. Detailed implementation manners

[0038] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0039] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Since the heat dissipation effect of the pole post base plate with a fuse structure in the traditional setting is poor, when laser welding operation is carried out between the pole post base plate and the pole ear, the temperature of the pole post base plate is too high, resulting in a large amount of heat being transferred to the plastic part in contact with the pole post base plate, causing the plastic part to be deformed by heat and extend in the horizontal direction. This will not only increase the probability of the plastic part being punctured due to the reduction in thickness, having a high short-circuit risk and poor insulation protection, but also change the outer dimension of the battery cover due to the deformation of the plastic part, making it difficult to insert the battery cover into the battery case during the assembly of the battery cover and the battery case, and the assembly processability is poor.

[0043] Therefore, in order to reduce the thermal influence on the plastic part during the laser welding operation and improve the insulation protection and assembly processability of the plastic part, this embodiment provides a battery cover.

[0044] Such as Figures 1 to 7As shown, the battery cover plate includes a first insulating member 1 and a conductive electrode post 2. A plugging through-hole 11 is formed on the first insulating member 1. The conductive electrode post 2 includes a post body 21, a post bottom plate 22, and an insulating and heat-conducting member 23. The post body 21 is inserted into the plugging through-hole 11. The post bottom plate 22 includes a fusing structure 221, a first connecting plate 222, and a second connecting plate 223. An installation through-slot 224 is provided on the fusing structure 221 and is disposed between the first connecting plate 222 and the second connecting plate 223. The first connecting plate 222 is connected to the post body 21. The side of the second connecting plate 223 facing away from the first insulating member 1 is welded to the pole ear. The insulating and heat-conducting member 23 is embedded in the installation through-slot 224. The length dimension of the insulating and heat-conducting member 23 in the first direction is H, the thickness dimension of the insulating and heat-conducting member 23 in the second direction is T1, and the cross-sectional area of the fusing structure 221 cut along the first direction is S, and it satisfies 9mm 2 ≤H×T1≤S.

[0045] By providing an installation through-slot 224 on the fusing structure 221 of the post bottom plate 22 and embedding the insulating and heat-conducting member 23 in the installation through-slot 224, on the one hand, the integrity of the post bottom plate 22 is increased by the insulating and heat-conducting member 23, and the heat dissipation area is enlarged. On the other hand, the insulating and heat-conducting member 23 with better heat conductivity is used to improve the heat dissipation performance. Thus, the heat dissipation speed of the post bottom plate 22 is improved through the cooperation of the two aspects, avoiding the first insulating member 1 in contact with the post bottom plate 22 from melting and deforming due to the too high temperature of the post bottom plate 22, thereby reducing the thermal influence of the high temperature during the welding operation on the first insulating member 1, enhancing the insulation protection performance, improving the assembly processability, and limiting the length dimension H of the insulating and heat-conducting member 23 in the first direction, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction, and the cross-sectional area S of the fusing structure 221 cut along the first direction, so that the three satisfy 9mm 2 ≤H×T1≤S. Thus, on the one hand, it is avoided that the area of the insulating and heat-conducting member 23 is too small, resulting in poor heat conduction effect. On the other hand, it is avoided that the area of the insulating and heat-conducting member 23 is too large, thus exceeding the post bottom plate 22 and occupying the working space during the welding of the pole ear and the post bottom plate 22, resulting in compression of the available welding area between the pole ear and the post bottom plate 22 and reducing the connection strength after welding.

[0046] Among them, the product of the length dimension H of the insulating and heat-conducting member 23 in the first direction and the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction can be any value greater than 9mm 2 such as 9mm 2 、10mm 2 、11mm 2 、12mm 2 、13mm 2 、14mm 2 、15mm 2 、16mm2 、17mm 2 、18mm 2 、19mm 2 , 20mm 2 However, it should be noted that the upper limit of the product of the length dimension H of the insulating thermal conductive member 23 along the first direction and the thickness dimension T1 of the insulating thermal conductive member 23 along the second direction cannot exceed the cross-sectional area S of the fuse structure 221 cut along the first direction.

[0047] In this embodiment, the fuse structure 221 is formed by injection molding between the first connecting plate 222 and the second connecting plate 223. The insulating heat conductive part 23 arranged in the mounting groove 224 of the fuse structure 221 is made of a material with high thermal conductivity and insulation, such as Si3N4 / AIN / BeO / PCD / ceramic, etc. In this embodiment, the insulating heat conductive part 23 is prepared using a ceramic block, so that it has both excellent thermal conductivity and insulation, ensuring that when a short circuit occurs and the fuse structure 221 melts, the first connecting plate 222 connected to the pole body 21 and the second connecting plate 223 welded to the pole ear are completely separated, and the pole body 21 and the pole ear will not be reconnected through the insulating heat conductive part 23.

[0048] In this embodiment, if Figure 1 As shown, the battery cover also includes a cover body 3, a second insulating member 4 and a connecting block 5. The cover body 3 is provided with a connecting through hole 31 corresponding to the plug-in through hole 11. One end of the pole body 21 passes through the plug-in through hole 11 and is inserted into the connecting through hole 31 and connected to the connecting block 5. The second insulating member 4 is arranged on the side of the cover body 3 away from the first insulating member 1, and is used to achieve insulation protection between the cover body 3, the pole body 21 and the connecting block 5. In addition, as Figure 1 , Figure 7 As shown, in order to ensure the firmness of the connection between the first insulating member 1 and the cover body 3, the first insulating member 1 is provided with a positioning protrusion 12 on the outside of the plug-in hole 11, and a positioning through hole 32 adapted to the positioning protrusion 12 is opened on the cover body 3, and the positioning protrusion 12 is inserted into the positioning through hole 32.

[0049] The battery cover can be a welded cover or a riveted cover. When the battery cover is a welded cover, the connecting block 5 is welded to the pole body 21. When the battery cover is a riveted cover, the connecting block 5 is riveted to the pole body 21. The battery cover of this structure can be adapted to different types of batteries by changing the number of conductive electrode columns 2. When one conductive electrode column 2 is provided on the battery cover, the battery cover is adapted to blade batteries. When two conductive electrode columns 2 are provided on the battery cover, the battery cover is adapted to square shell batteries.

[0050] In this embodiment, the conductive electrode post 2 provided with the fusing structure 221 is generally the positive electrode post. Since the negative tab is generally made of copper, the negative electrode post connected to the negative tab is generally also made of copper. And the thermal conductivity of copper is higher, so there is no need to set the fusing structure 221 on the negative electrode post, which can avoid wasting resources and reduce the manufacturing cost. In order to prevent the fusing structure 221 from melting when welding the tab and the electrode post base plate 22, the melting point of the fusing structure 221 is greater than the temperature during the welding of the tab and the electrode post base plate 22 and not greater than the temperature during short circuit.

[0051] Optionally, as Figure 3 , Figure 6 shown, the thickness dimension T of the fusing structure 221 in the second direction and the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction satisfy 1.5 mm ≤ T1 ≤ T. By limiting the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction and the thickness dimension T of the fusing structure 221 in the second direction, on the one hand, it can prevent the thickness of the insulating and heat-conducting member 23 from being too small, resulting in poor structural strength and easy damage. On the other hand, it can prevent the thickness of the insulating and heat-conducting member 23 from being too large, thus exceeding the electrode post base plate 22 and occupying the working space during the welding of the tab and the electrode post base plate 22, resulting in compression of the available welding area between the tab and the electrode post base plate 22 and reducing the connection strength after welding.

[0052] Among them, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction can be any value greater than 1.5 mm, such as 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. However, it should be noted that the upper limit value of the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction cannot exceed the thickness dimension T of the fusing structure 221 in the second direction.

[0053] Optionally, as Figure 5 shown, the length dimension L of the installation through groove 224 in the first direction and the length dimension W of the fusing structure 221 in the first direction satisfy 3 mm ≤ (W - L) / 2 ≤ 7 mm. By limiting the length dimension L of the installation through groove 224 in the first direction and the length dimension W of the fusing structure 221 in the first direction, so that the two satisfy 3 mm ≤ (W - L) / 2 ≤ 7 mm, thus preventing the remaining material of the fusing structure 221 from being too little after the installation through groove 224 is opened, and reducing the temperature reference for the fusing structure 221 to break.

[0054] In this embodiment, since the length dimension of the fusing structure 221 in the first direction is W and the thickness dimension of the fusing structure 221 in the second direction is T, the cross-sectional area S of the fusing structure 221 cut along the first direction is S = W × T, unit mm 2 .

[0055] Among them, in order to verify the limitation of the length dimension H of the insulating and heat-conducting member 23 in the first direction, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction, and the cross-sectional area S of the fusing structure 221 cut along the first direction, the thermal influence on the first insulating member 1 during the welding of the tab and the pole column base plate 22, and the limitation of the length dimension L of the installation through groove 224 in the first direction and the length dimension W of the fusing structure 221 in the first direction on the fusing reference of the fusing structure 221, as shown in Table 1, six sets of examples and four sets of comparative examples are provided for verification. Among them, the conducting electrode column 2 is the positive electrode column welded to the positive tab. A fusing structure 221 is provided on the pole column base plate 22 of the conducting electrode column 2. The material of the first insulating member 1 in contact with the pole column base plate 22 is the industry-general material PP (melting point temperature 160°C - 170°C), and the welding power of the tab and the pole column base plate 22 is 1000W each.

[0056] Table 1

[0057]

[0058] As can be seen from Examples 1 to 6 in Table 1, when the limitation of the length dimension H of the insulating and heat-conducting member 23 in the first direction, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction, and the cross-sectional area S of the pole column base plate 22 satisfy the range of 9mm 2 ≤H×T1≤S, at this time, the area of the insulating and heat-conducting member 23 meets the heat-conducting requirements and does not exceed the pole column base plate 22, without interfering with the welding operation. When the limitation of the length dimension L of the installation through groove 224 in the first direction and the length dimension W of the fusing structure 221 in the first direction satisfy the range of 3mm≤(W - L) / 2≤7mm, at this time, there is still enough material thickness remaining in the fusing structure 221 after the installation through groove 224 is opened, so that the temperature reference for the fusing structure 221 to break is not affected by the installation through groove 224.

[0059] As can be seen from Comparative Example 1 in Table 1, when the limitation values of the length dimension H of the insulating and heat-conducting member 23 in the first direction, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction, and the cross-sectional area S of the pole column base plate 22 are less than the minimum value of 9mm 2 ≤H×T1≤S, at this time, the area of the insulating and heat-conducting member 23 is too small, resulting in poor heat-conducting effect, thus making the temperature of the pole column base plate 22 too high, having a greater thermal influence on the first insulating member 1, and the first insulating member 1 melts due to heat.

[0060] As can be seen from Comparative Example 2 in Table 1, when the limitation values of the length dimension H of the insulating and heat-conducting member 23 in the first direction, the thickness dimension T1 of the insulating and heat-conducting member 23 in the second direction, and the cross-sectional area S of the pole column base plate 22 are greater than 9mm 2When ≤H×T1≤ the maximum value of S, the area of the insulating and heat-conducting member 23 is too large at this time, thus exceeding the pole column bottom plate 22 and occupying the working space during the welding of the pole ear and the pole column bottom plate 22. This not only affects the normal welding operation but also reduces the available welding area between the compressed pole ear and the pole column bottom plate 22, resulting in a decrease in the connection strength after welding.

[0061] As can be seen from Comparative Example 3 to Comparative Example 4 in Table 1, when the limiting value of the length dimension L of the installation through groove 224 along the first direction and the length dimension W of the fusing structure 221 along the first direction is less than the minimum value of 3mm ≤ (W - L) / 2 ≤ 7mm, after the fusing structure 221 is provided with the installation through groove 224, the remaining material is too little, resulting in a reduction in the temperature reference at which the fusing structure 221 breaks.

[0062] Optionally, as Figure 1 , Figure 3 shown, the battery cover plate further includes a heat-conducting patch 6. The heat-conducting patch 6 is attached to the side of the pole column bottom plate 22 where it is welded to the pole ear, and part of the heat-conducting patch 6 covers the first connecting plate 222, the second connecting plate 223, and the fusing structure 221. By providing the heat-conducting patch 6 on the pole column bottom plate 22, the speed of heat transfer from the second connecting plate 223 to the first connecting plate 222 away from the welding area during the welding of the second connecting plate 223 and the pole ear is accelerated, thereby increasing the heat dissipation speed of the second connecting plate 223 and preventing the temperature of the second connecting plate 223 from being too high, which may cause the first insulating member 1 in contact with the second connecting plate 223 to melt and deform.

[0063] Optionally, as Figure 3 shown, the projected area of the heat-conducting patch 6 along the second direction on the first connecting plate 222 is larger than the projected area of the heat-conducting patch 6 along the second direction on the second connecting plate 223. Since the pole ear is welded to the second connecting plate 223, by reducing the heat-conducting patch 6 covering the second connecting plate 223, more welding areas are reserved for the welding with the pole ear, ensuring that the welding area between the pole ear and the second connecting plate 223 is sufficient. And since the first connecting plate 222 is located at one end away from the welding area and its temperature is lower than that of the second connecting plate 223, a larger area of the heat-conducting patch 6 is arranged on the first connecting plate 222, thereby accelerating the heat dissipation speed and improving the heat dissipation efficiency.

[0064] Optionally, as Figure 1As shown in the figure, a receiving groove 13 is further formed in the first insulating member 1, and the first connecting plate 222, the second connecting plate 223, and the fusing structure 221 are all received in the receiving groove 13. By forming the receiving groove 13 in the first insulating member 1, the pole bottom plate 22 is received in the receiving groove 13, so that there is an overlapping part between the pole bottom plate 22 and the first insulating member 1 in space, making the structure more compact, reducing the overall thickness dimension of the battery cover plate, reducing the occupied space, thereby increasing the volume of the electrode group and improving the power supply capacity.

[0065] Optionally, as Figure 2 shown, the receiving groove 13 includes a groove bottom wall 15 opposite to the fusing structure 221 in the second direction and two inner side walls 16 oppositely arranged in the first direction. A plurality of limiting protrusions 14 abutting against the pole bottom plate 22 are symmetrically distributed on the two inner side walls 16. By providing the limiting protrusions 14 abutting against the pole bottom plate 22 on the two inner side walls 16, the position of the pole bottom plate 22 is limited and fixed, avoiding the problem that the pole bottom plate 22 is displaced during the welding of the pole bottom plate 22 and the pole ear, resulting in poor welding.

[0066] In this embodiment, since the pole bottom plate 22 includes the first connecting plate 222 and the second connecting plate 223, it is necessary to provide the limiting protrusions 14 respectively abutting against the first connecting plate 222 and the second connecting plate 223 on the inner side wall 16 to ensure the firmness of the fixation with the pole bottom plate 22. The number of the limiting protrusions 14 provided on a single inner side wall 16 can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 14 are provided on each inner side wall 16 to abut against the first connecting plate 222, and one limiting protrusion 14 is provided to abut against the second connecting plate 223. The reason why the number of the limiting protrusions 14 abutting against the first connecting plate 222 is greater than the number of the limiting protrusions 14 abutting against the second connecting plate 223 is that the temperature of the first connecting plate 222 is lower than that of the second connecting plate 223. Therefore, the limiting protrusions 14 are prevented from melting due to heat, resulting in ineffective fixation of the pole bottom plate 22.

[0067] Optionally, the battery cover plate further includes an insulating rubber sleeve 7. The insulating rubber sleeve 7 is sleeved outside the fusing structure 221. The insulating rubber sleeve 7 includes a rubber sleeve main body 71, and the rubber sleeve main body 71 is arranged between the groove bottom wall 15 and the fusing structure 221. By arranging the rubber sleeve main body 71 of the insulating rubber sleeve 7 between the groove bottom wall 15 and the fusing structure 221, insulation protection is achieved, avoiding the occurrence of arcing due to the too small gap between the first connecting plate 222 and the second connecting plate 223.

[0068] Optionally, the insulating rubber sleeve 7 further includes rubber sleeve side plates 72. The rubber sleeve side plates 72 are connected to both sides of the rubber sleeve body 71 along the first direction, and the rubber sleeve side plates 72 are arranged between the inner side wall 16 and the fusing structure 221. By arranging the rubber sleeve side plates 72 between the inner side wall 16 and the fusing structure 221, the residues after the fusing structure 221 melts can be prevented from falling into the battery interior, causing damage.

[0069] In this embodiment, a battery is further provided. The battery includes a battery cell group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a cavity structure with an opening, and the battery cover plate is arranged at the opening of the battery housing to close the battery housing, so as to form a receiving cavity for accommodating the battery cell group. By applying the above-mentioned battery cover plate, the battery not only reduces the probability of short circuit and improves the product quality, but also greatly improves the assembly speed, shortens the assembly cycle, and improves the production capacity due to the improvement of the assembly processability.

[0070] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover comprises: A first insulating member, wherein the first insulating member is provided with an inserting through hole; A conductive electrode, the conductive electrode comprising a pole body, a pole bottom plate and an insulating heat-conducting member, the pole body being inserted into the plug-in through hole, the pole bottom plate comprising a fuse structure, a first connecting plate and a second connecting plate, the fuse structure being provided with a mounting groove and being arranged between the first connecting plate and the second connecting plate, the first connecting plate being connected to the pole body, the second connecting plate being welded to the pole ear on a side away from the first insulating member, and the insulating heat-conducting member being embedded in the mounting groove; The length dimension of the insulating and heat-conducting member in the first direction is H, the thickness dimension of the insulating and heat-conducting member in the second direction is T1, the cross-sectional area of the fusing structure cut along the first direction is S, and it satisfies 9mm 2 ≤ H × T1 ≤ S.

2. The battery cover plate according to claim 1, wherein The thickness dimension of the fuse structure along the second direction is T, and the thickness dimension T1 of the insulating heat conductive component along the second direction satisfies 1.5 mm≤T1≤T.

3. The battery cover plate according to claim 1, characterized in that, The length dimension of the installation through groove along the first direction is L, the length dimension of the fuse structure along the first direction is W, and 3mm≤(WL) / 2≤7mm is satisfied.

4. The battery cover plate according to claim 1, wherein, The battery cover plate also includes a thermally conductive patch, which is attached to one side of the pole bottom plate welded to the pole ear, and the first connecting plate, the second connecting plate and the fuse structure are partially covered with the thermally conductive patch.

5. The battery cover plate according to claim 4, wherein A projection area of the thermal conductive patch on the first connecting plate along the second direction is larger than a projection area of the thermal conductive patch on the second connecting plate along the second direction.

6. The battery cover plate according to claim 1, characterized in that The first insulating member is also provided with a receiving groove, and the first connecting plate, the second connecting plate and the fuse structure are all received in the receiving groove.

7. The battery cover plate according to claim 6, characterized in that, The accommodating groove comprises a groove bottom wall opposite to the fuse structure along the second direction and two inner side walls opposite to each other along the first direction, and a plurality of limiting protrusions abutting against the pole bottom plate are symmetrically distributed on the two inner side walls.

8. The battery cover plate according to claim 7, wherein The battery cover plate further includes an insulating rubber sleeve, which is sleeved on the outer side of the fuse structure. The insulating rubber sleeve includes a rubber sleeve body, which is arranged between the bottom wall of the groove and the fuse structure.

9. The battery cover plate according to claim 8, wherein, The insulating rubber sleeve further includes a rubber sleeve side plate, which is connected to two sides of the rubber sleeve body along the first direction, and is arranged between the inner side wall and the fuse structure.

10. A battery, characterized in that, The battery comprises a pole group, a battery shell and a battery cover as described in any one of claims 1 to 9, wherein the battery shell is a cavity structure with an opening, and the battery cover is arranged at the opening of the battery shell to close the battery shell to form a receiving cavity for accommodating the pole group.

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