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 conductive pole and a first insulating part, the conductive pole comprises a pole main body and a pole bottom plate, the pole main body is connected to the pole bottom plate, one side of the pole bottom plate deviating from the pole main body is provided with a welding mark formed by welding with a tab, and the first insulating part is arranged on the pole bottom plate. The pole bottom plate is provided with a plurality of heat dissipation channels which extend along a first direction and penetrate through the pole bottom plate, the first insulating part is provided with an insertion through hole for the pole main body to penetrate through, the width size of the heat dissipation channels along a second direction is H, the thickness size of the pole bottom plate along the second direction is T, and H / T is more than or equal to 0.1 and less than or equal to 0.28. When the tab and the pole bottom plate are welded, the heat dissipation area is increased through the heat dissipation channel, and the heat transferred from the pole bottom plate to the first insulating part is reduced, so that the heat influence of the first insulating part when the tab and the pole bottom plate are welded is reduced, the deformation of the first insulating part due to high temperature is avoided, and the insulating property and the assembly manufacturability are improved.

Description

Technical Field

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

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

[0003] In order to avoid short circuit caused by direct contact between the conductive electrode column and the bare aluminum plate, a plastic part for insulation is usually provided between the conductive electrode column and the bare aluminum plate. However, when the conductive electrode column and the pole ear are connected by laser welding, the heat generated during the welding process will cause the temperature of the conductive electrode column to rise rapidly, resulting in the temperature of the conductive electrode column being too high. A large amount of heat is transferred to the plastic part between the conductive electrode column and the bare aluminum plate, causing the plastic part to deform due to heat and extend in the horizontal direction. This will not only increase the probability of the plastic part being broken down due to the reduction in thickness, resulting in a high short circuit risk and poor insulation protection, but also change the outer dimensions of the battery cover due to the deformation of the plastic part, making it difficult to assemble the battery cover into the battery shell and the assembly process is poor. Summary of the invention

[0004] The object of the present invention is to provide a battery cover plate and a battery with strong insulation protection and good assembly processability.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a battery cover is provided, the battery cover comprising:

[0007] A conductive electrode, the conductive electrode comprising a pole body and a pole bottom plate, the pole body being connected to the pole bottom plate, a welding mark being welded to a pole ear on a side of the pole bottom plate away from the pole body, and a plurality of heat dissipation channels extending in a first direction and penetrating the pole bottom plate are provided on the pole bottom plate;

[0008] A first insulating member, wherein the first insulating member is provided with an inserting through hole for the pole body to pass through;

[0009] The width dimension of the heat dissipation channel along the second direction is H, the thickness dimension of the pole bottom plate along the second direction is T, and 0.1≤H / T≤0.28 is satisfied.

[0010] Optionally, a width dimension H of the heat dissipation channel along the second direction satisfies 0.2 mm ≤ H ≤ 0.55 mm.

[0011] Optionally, the pole bottom plate includes a first connecting plate, a second connecting plate, and a fusing structure. The first connecting plate is connected to the pole body. The second connecting plate is welded to the pole ear on a side facing away from the first insulating member. The fusing structure is disposed between the first connecting plate and the second connecting plate.

[0012] Optionally, a blocking through groove is formed in the fusing structure.

[0013] Optionally, the conducting pole column further includes an insulating rubber sleeve, and the insulating rubber sleeve is disposed outside the fusing structure.

[0014] Optionally, a receiving groove is further formed in the first insulating member. The first connecting plate, the second connecting plate, and the fusing structure are all received in the receiving groove. The receiving groove includes a first wall surface opposite to the pole bottom plate along the second direction. A plurality of heat dissipation through holes distributed in a grid shape are formed in the first wall surface.

[0015] Optionally, the total area of the projections of the plurality of heat dissipation through holes on the pole bottom plate along the second direction is S, the area of the welding mark is S1, and 0.1 ≤ S1 / S ≤ 0.25 is satisfied.

[0016] Optionally, the receiving groove further includes two second wall surfaces opposite to the pole bottom plate along the first direction. Limiting protrusions that are in contact with the pole bottom plate are symmetrically distributed on the two second wall surfaces.

[0017] Optionally, the number of the limiting protrusions in contact with the first connecting plate on each second wall surface is greater than the number of the limiting protrusions in contact with the second connecting plate.

[0018] On the other hand, a battery is provided. The battery includes a pole group, a battery housing, and the battery cover plate according to any one of the above. The battery housing is a cavity structure provided with an opening. The battery cover plate is disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for receiving the pole group.

[0019] Advantages of the present invention:

[0020] The present invention provides a battery cover plate. By providing a plurality of heat dissipation channels on the pole column bottom plate welded to the tab, which extend along a first direction and penetrate the pole column bottom plate, when the tab is welded to the pole column bottom plate, the heat dissipation area is increased through the heat dissipation channels, and the heat transferred from the pole column bottom plate to the first insulating member is reduced, thereby reducing the thermal influence on the first insulating member during the welding of the tab to the pole column bottom plate, avoiding deformation of the first insulating member due to high temperature, improving the insulation performance and assembly processability. Moreover, by limiting the ratio between the width dimension H of the heat dissipation channel along a second direction and the thickness dimension T of the pole column bottom plate along the second direction, such that 0.1 ≤ H / T ≤ 0.28, on the one hand, it avoids the space of the heat dissipation channel being too small, reducing the heat dissipation effect of the heat dissipation channel, and on the other hand, it avoids the space of the heat dissipation channel being too large, resulting in poor structural strength of the pole column bottom plate and being prone to damage during welding.

[0021] The present invention also provides a battery. By applying the above-mentioned battery cover plate, not only the probability of short circuit is reduced and the product quality is improved, but also 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of the structure of the battery cover plate provided by the present invention;

[0023] Figure 2 is a bottom plan view of the battery cover plate provided by the present invention;

[0024] Figure 3 is a three-dimensional assembly view of the conductive pole column in the battery cover plate provided by the present invention;

[0025] Figure 4 is a plan assembly view of the conductive pole column in the battery cover plate provided by the present invention;

[0026] Figure 5 is a schematic structural view of the conductive pole column in the battery cover plate provided by the present invention without the insulating rubber sleeve assembled;

[0027] Figure 6 is a schematic structural view of the first insulating member in the battery cover plate provided by the present invention.

[0028] In the figure:

[0029] 100, welding mark;

[0030] 1, conductive pole column; 11, pole column body; 12, pole column bottom plate; 121, first connecting plate; 122, second connecting plate; 123, fusing structure; 124, blocking through groove; 13, heat dissipation channel; 14, insulating rubber sleeve;

[0031] 2. The first insulating member; 21. Insertion through hole; 22. Accommodating groove; 221. First wall surface; 222. Heat dissipation through hole; 223. Second wall surface; 224. Limiting protrusion;

[0032] 3. The cover plate body;

[0033] 4. The second insulating member;

[0034] 5. The connecting block. Specific embodiments

[0035] The present invention will be further described in detail below with reference to the accompanying 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 rather than all structures are shown in the drawings.

[0036] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. 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.

[0037] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" 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 other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are 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, and therefore cannot be understood 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 meanings.

[0039] Since the plastic part is arranged between the pole and the bare aluminum plate, when the pole ear and the pole are connected by welding, the high temperature generated causes the plastic part to be deformed by heat and extend in the horizontal direction, which not only reduces the thickness of the plastic part and increases the probability of the plastic part being punctured and causing a short circuit, posing a high risk and poor insulation protection, but also because the plastic part is heated and extended in the horizontal direction, the outer dimensions of the battery cover will increase, making it difficult to enter the shell and having poor assembly processability.

[0040] Therefore, in order to reduce the thermal impact on the plastic parts during welding and improve the insulation protection and assembly processability of the plastic parts, this embodiment provides a battery cover.

[0041] like Figures 1 to 6 As shown, the battery cover includes a conductive electrode 1 and a first insulating member 2, the conductive electrode 1 includes a pole body 11 and a pole bottom plate 12, the pole body 11 is connected to the pole bottom plate 12, the pole bottom plate 12 is welded to the pole ear on one side away from the pole body 11, a plurality of heat dissipation channels 13 extending along a first direction and penetrating the pole bottom plate 12 are provided on the pole bottom plate 12, a plug-in through hole 21 for the pole body 11 to pass through is provided on the first insulating member 2, the width dimension of the heat dissipation channel 13 along the second direction is H, the thickness dimension of the pole bottom plate 12 along the second direction is T, and 0.1≤H / T≤0.28 is satisfied.

[0042] The battery cover plate is provided with a plurality of heat dissipation channels 13 extending along a first direction and penetrating the pole bottom plate 12 on the pole bottom plate 12 welded to the pole lug, so that when the pole lug and the pole bottom plate 12 are welded, the heat dissipation area is increased through the heat dissipation channels 13, and the heat transferred from the pole bottom plate 12 to the first insulating member 2 is reduced, thereby reducing the thermal influence of the first insulating member 2 when the pole lug and the pole bottom plate 12 are welded, avoiding deformation of the first insulating member 2 due to high temperature, improving the insulation performance and assembly processability, and limiting the ratio between the width dimension H of the heat dissipation channel 13 along the second direction and the thickness dimension T of the pole bottom plate 12 along the second direction, so that the two satisfy 0.1≤H / T≤0.28, thereby avoiding on the one hand that the space of the heat dissipation channel 13 is too small, reducing the heat dissipation effect of the heat dissipation channel 13, and on the other hand avoiding that the space of the heat dissipation channel 13 is too large, resulting in poor structural strength of the pole bottom plate 12, which is easy to be damaged during welding.

[0043] The number of heat dissipation channels 13 arranged on the pole bottom plate 12 can be adjusted according to the size and thickness of the pole bottom plate 12. In the present embodiment, four heat dissipation channels 13 are provided on the pole bottom plate 12, and the cross-sectional shape of the heat dissipation channels 13 can also be freely adjusted according to demand, such as rectangular, circular or elliptical.

[0044] In this embodiment, if it is desired to enhance the heat dissipation effect of the heat dissipation channel 13, the inner wall of the heat dissipation channel 13 can also be made wavy or serrated by using laser cutting technology, thereby increasing the contact area between the heat dissipation channel 13 and the air and improving the heat dissipation effect.

[0045] In this embodiment, as Figure 1 shown, the battery cover plate further includes a second insulating member 4 and a connecting block 5. A connecting through hole corresponding to the insertion through hole 21 is formed on the cover plate body 3. One end of the pole column main body 11 passing through the insertion through hole 21 is inserted into the connecting through hole and connected to the connecting block 5. The second insulating member 4 is disposed on the side of the cover plate body 3 facing away from the first insulating member 2 and is used to achieve insulation protection among the cover plate body 3, the pole column main body 11, and the connecting block 5. In addition, in order to ensure the firmness of the connection between the first insulating member 2 and the cover plate body 3, the first insulating member 2 is provided with a positioning protrusion outside the insertion through hole 21, and a positioning through hole adapted to the positioning protrusion is formed on the cover plate body 3. The positioning protrusion is inserted into the positioning through hole.

[0046] The battery cover plate can be a welded cover plate or a riveted cover plate. When the battery cover plate is a welded cover plate, the connecting block 5 is welded to the pole column main body 11. When the battery cover plate is a riveted cover plate, the connecting block 5 is riveted to the pole column main body 11. Moreover, the battery cover plate of this structure can be adapted to different types of batteries by changing the number of the conducting pole columns 1. When there is one conducting pole column 1 on the battery cover plate, the battery cover plate is adapted to a blade battery. When there are two conducting pole columns 1 on the battery cover plate, the battery cover plate is adapted to a square shell battery.

[0047] Optionally, as Figure 3 、 Figure 4 shown, the width dimension H of the heat dissipation channel 13 in the second direction satisfies 0.2 mm ≤ H ≤ 0.55 mm. By limiting the width dimension H of the heat dissipation channel 13 in the second direction to satisfy 0.2 mm ≤ H ≤ 0.55 mm, the internal space of the heat dissipation channel 13 is prevented from being too small, resulting in a small contact area with the air and poor heat dissipation effect.

[0048] In this embodiment, the thickness dimension T of the pole column bottom plate 12 in the second direction satisfies T ≥ 1.5 mm. By limiting the thickness dimension T of the pole column bottom plate 12 in the second direction to satisfy T ≥ 1.5 mm, the thickness of the pole column bottom plate 12 is prevented from being too small, resulting in too low structural strength of the pole column bottom plate 12 and easy damage to the pole column bottom plate 12 when using a welding tooling to fix the pole column bottom plate 12.

[0049] Optionally, the pole base plate 12 includes a first connecting plate 121, a second connecting plate 122 and a fuse structure 123, the first connecting plate 121 is connected to the pole body 11, the second connecting plate 122 is welded to the pole ear on the side away from the first insulating member 2, and the fuse structure 123 is arranged between the first connecting plate 121 and the second connecting plate 122.

[0050] The pole bottom plate 12 is formed by the first connecting plate 121, the second connecting plate 122 and the fuse structure 123, so that when a short circuit occurs, the high temperature generated is used to melt the fuse structure 123, so that the pole body 11 connected to the first connecting plate 121 and the pole ear connected to the second connecting plate 122 are disconnected, thereby improving the safety protection performance. In addition, since the first connecting plate 121 and the second connecting plate 122 are connected by the fuse structure 123, their heat conduction ability is smaller than that of the pole bottom plate 12 formed of an integral metal plate, and the heat dissipation area is smaller and the heat conduction ability is worse. Therefore, when the pole ear and the pole bottom plate 12 are welded, the heat dissipation area is increased through the heat dissipation channel 13, and the heat transferred from the pole bottom plate 12 to the first insulating member 2 is reduced, thereby reducing the thermal influence of the first insulating member 2 when the pole ear and the pole bottom plate 12 are welded, avoiding the first insulating member 2 from being deformed due to high temperature, and improving the insulation performance and assembly processability.

[0051] In this embodiment, the conductive electrode column 1 provided with the fuse structure 123 is generally a positive electrode column. Since the negative electrode ear is generally made of copper, the negative electrode column connected to the negative electrode ear is generally also made of copper. The thermal conductivity of copper is higher, so there is no need to set the fuse structure 123 on the negative electrode column, avoiding waste of resources and reducing manufacturing costs. In order to prevent the fuse structure 123 from melting when welding the electrode ear and the electrode bottom plate 12, the melting point of the fuse structure 123 is greater than the temperature when the electrode ear and the electrode bottom plate 12 are welded, and not greater than the temperature when a short circuit occurs.

[0052] Alternatively, if Figure 5 As shown, a blocking slot 124 is provided on the fuse structure 123. By providing the blocking slot 124 on the fuse structure 123, the cross-sectional area on the fuse structure 123 is reduced, so that when a short circuit occurs, the heat generation is accelerated due to the smaller cross-section, thereby achieving early fusing, and its protection is better. However, since the cross-sectional area of the fuse structure 123 is smaller after the blocking slot 124 is provided, it is more necessary to provide a heat dissipation channel 13 on the pole bottom plate 12 in coordination with providing a plurality of heat dissipation holes 222 on the first wall surface 221 of the first insulating member 2, so as to effectively reduce the thermal impact of the high temperature generated when the second connecting plate 122 is welded to the pole ear on the first insulating member 2.

[0053] Alternatively, if Figure 3 , Figure 5As shown in the figure, the battery cover plate further includes an insulating rubber sleeve 14, and the insulating rubber sleeve 14 is arranged outside the fusing structure 123. By arranging the insulating rubber sleeve 14 outside the fusing structure 123, on the one hand, it plays an insulating and protective role, avoiding the occurrence of arcing due to the too small gap between the first connecting plate 121 and the second connecting plate 122. On the other hand, when a short circuit occurs, since the insulating rubber sleeve 14 is arranged outside the fusing structure 123, it can avoid the residue after the fusing structure 123 melts from falling into the battery interior and causing damage.

[0054] Among them, in order to verify the ratio between the width dimension H of the heat dissipation channel 13 in the second direction and the thickness dimension T of the pole column base plate 12 in the second direction, and the thermal influence on the first insulating member 2 during the welding of the pole ear and the pole column base plate 12, as shown in Table 1, six sets of embodiments and three sets of comparative examples are provided for verification. The conducting pole column 1 is the positive pole column welded to the positive pole ear. A fusing structure 123 is arranged on the pole column base plate 12 of the conducting pole column 1. The material of the first insulating member 2 in contact with the pole column base plate 12 is the industry - common material PP (melting point temperature 160°C - 170°C), and the welding power of the pole ear and the pole column base plate 12 is 1000W.

[0055] Table 1

[0056]

[0057] As can be seen from Embodiments 1 to 6 in Table 1, when the ratio between the width dimension H of the heat dissipation channel 13 in the second direction and the thickness dimension T of the pole column base plate 12 in the second direction satisfies the range of 0.1 ≤ H / T ≤ 0.28, at this time, the size of the heat dissipation channel 13 not only meets the heat dissipation requirements during the welding of the pole column base plate 12 and the pole ear, but also avoids the too low structural strength of the pole column base plate 12. Therefore, after the pole ear and the pole column base plate 12 are welded, no hot - melting marks are found on the first insulating member 2, and no damage is found on the pole column base plate 12.

[0058] As can be seen from Comparative Example 1 in Table 1, when the ratio between the width dimension H of the heat dissipation channel 13 in the second direction and the thickness dimension T of the pole column base plate 12 in the second direction is greater than the maximum value of 0.1 ≤ H / T ≤ 0.28, at this time, due to the too large space of the heat dissipation channel 13, the structural strength of the pole column base plate 12 is poor, so that when welding, when the pole column base plate 12 is fixed by the welding tooling, the pole column base plate 12 is damaged and cracks appear.

[0059] As can be seen from Comparative Example 2 and Comparative Example 3 in Table 1, when the ratio between the width dimension H of the heat dissipation channel 13 in the second direction and the thickness dimension T of the pole post base plate 12 in the second direction is less than the minimum value of 0.1 ≤ H / T ≤ 0.28, the space of the heat dissipation channel 13 is too small at this time, and the contact area with air is too small, resulting in poor heat dissipation effect of the heat dissipation channel 13, and causing more heat to be transferred to the first insulating member 2, resulting in thermal melting deformation of the first insulating member 2 due to excessive temperature.

[0060] Optionally, as Figure 6 shown, a receiving groove 22 is further formed in the first insulating member 2, the first connecting plate 121, the second connecting plate 122 and the fusing structure 123 are all received in the receiving groove 22, and the receiving groove 22 includes a first wall surface 221 opposite to the pole post base plate 12 in the second direction, and a plurality of heat dissipation through holes 222 distributed in a grid shape are formed in the first wall surface 221. By forming a plurality of heat dissipation through holes 222 distributed in a grid shape in the first wall surface 221 opposite to the pole post base plate 12 in the second direction of the receiving groove 22, the heat dissipation speed of the first insulating member 2 is accelerated, the thermal influence of high temperature on the first insulating member 2 is avoided, and it cooperates with the heat dissipation channel 13 on the pole post base plate 12 to achieve double heat dissipation during welding, so that the heat dissipation effect is better, the heat dissipation speed is faster, and the thermal influence on the first insulating member 2 is smaller.

[0061] Optionally, the total area of the plurality of heat dissipation through holes 222 is S, the area of the welding mark 100 is S1, and 0.1 ≤ S1 / S ≤ 0.25 is satisfied. By limiting the relationship between the total area S of the heat dissipation through holes 222 and the area S1 of the welding mark 100, on the one hand, it is avoided that the total area of the heat dissipation through holes 222 is too small, resulting in weakening the heat dissipation effect of the plurality of heat dissipation through holes 222 on the first insulating member 2, and on the other hand, it is avoided that the area of the plurality of heat dissipation through holes 222 is too large, excessively weakening the structural strength of the first insulating member 2 itself, resulting in deformation of the first insulating member 2 when supporting the pole post base plate 12 and causing problems such as poor welding.

[0062] In this embodiment, the cross-sectional area dimension of each heat dissipation through hole 222 is P, and the number of heat dissipation through holes 222 formed in the first wall surface 221 is n. Therefore, the total area S of the plurality of heat dissipation through holes 222 = n × P.

[0063] Among them, in order to verify the ratio between the total area S of multiple heat dissipation through-holes 222 and the area S1 of the welding mark 100, and the thermal influence on the first insulating member 2 during the welding of the tab and the tab bottom plate 12, as shown in Table 2, six sets of embodiments and three sets of comparative examples are provided for verification. The conductive tab 1 is the positive tab welded to the positive tab, and a fusing structure 123 is provided on the tab bottom plate 12 of the conductive tab 1. The material of the first insulating member 2 in contact with the tab bottom plate 12 is the industry-standard material PP (melting point temperature 160°C - 170°C), and the welding power of the tab and the tab bottom plate 12 is 1000W.

[0064] Table 2

[0065]

[0066] As can be seen from Embodiments 7 to 12 in Table 2, when the ratio between the total area S of multiple heat dissipation through-holes 222 and the area S1 of the welding mark 100 satisfies the range of 0.1 ≤ S1 / S ≤ 0.25, the total area of the heat dissipation through-holes 222 can not only meet the heat dissipation requirements during the welding of the tab bottom plate 12 and the tab, but also avoid the structural strength of the first insulating member 2 being too low, resulting in insufficient support for the tab bottom plate 12 during welding and causing welding abnormalities.

[0067] As can be seen from Comparative Example 4 in Table 2, when the ratio between the total area S of multiple heat dissipation through-holes 222 and the area S1 of the welding mark 100 is less than the minimum value of 0.1 ≤ S1 / S ≤ 0.25, the heat dissipation area on the first insulating member 2 is insufficient, resulting in poor heat dissipation effect, so that the heat transferred to the first insulating member 2 cannot be dissipated to the outside air in time, and finally the first insulating member 2 undergoes hot melting deformation due to excessive temperature.

[0068] As can be seen from Comparative Examples 5 and 6 in Table 2, when the ratio between the total area S of multiple heat dissipation through-holes 222 and the area S1 of the welding mark 100 is greater than the maximum value of 0.1 ≤ S1 / S ≤ 0.25, the area of the multiple heat dissipation through-holes 222 is too large, excessively weakening the structural strength of the first insulating member 2 itself, resulting in deformation of the first insulating member 2 when supporting the tab bottom plate 12 and causing problems with poor welding.

[0069] Optionally, as Figure 5 and Figure 6 shown, the accommodating groove 22 further includes two second wall surfaces 223 opposite to the tab bottom plate 12 in the first direction, and limiting protrusions 224 in contact with the tab bottom plate 12 are symmetrically distributed on the two second wall surfaces 223. By providing the limiting protrusions 224 in contact with the tab bottom plate 12 on the second wall surfaces 223, the position of the tab bottom plate 12 is limited and fixed, avoiding misalignment of the tab bottom plate 12 during the welding of the tab bottom plate 12 and the tab and causing problems with poor welding.

[0070] In this embodiment, since the pole column bottom plate 12 includes a first connecting plate 121 and a second connecting plate 122, it is necessary to provide limiting protrusions 224 on the second wall surface 223 that are respectively in contact with the first connecting plate 121 and the second connecting plate 122 to ensure the firmness of the fixation with the pole column bottom plate 12. The number of limiting protrusions 224 provided on a single second wall surface 223 can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 224 are provided on each second wall surface 223 to be in contact with the first connecting plate 121, and one limiting protrusion 224 is provided to be in contact with the second connecting plate 122.

[0071] Optionally, the number of limiting protrusions 224 on each second wall surface 223 that are in contact with the first connecting plate 121 is greater than the number of limiting protrusions 224 that are in contact with the second connecting plate 122. The reason why the number of limiting protrusions 224 in contact with the first connecting plate 121 is greater than the number of limiting protrusions 224 in contact with the second connecting plate 122 is that the temperature of the first connecting plate 121 is lower than that of the second connecting plate 122. Therefore, it is avoided that the limiting protrusions 224 are melted by heat, resulting in ineffective fixation of the pole column bottom plate 12.

[0072] 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 provided at the opening of the battery housing to close the battery housing and 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 increases the production capacity due to the improvement of the assembly processability.

[0073] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit 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 list all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover plate includes: A conductive electrode post, which includes a post body and a post bottom plate. The post body is connected to the post bottom plate. On the side of the post bottom plate facing away from the post body, there is a welding mark for welding with the tab. Multiple heat dissipation channels are formed on the post bottom plate and extend along a first direction and penetrate through the post bottom plate; A first insulating member, on which there is a plugging through hole for the post body to pass through; The width dimension of the heat dissipation channel along a second direction is H, and the thickness dimension of the post bottom plate along the second direction is T, and 0.1≤H / T≤0.28 is satisfied.

2. The battery cover plate according to claim 1, characterized in that The width dimension H of the heat dissipation channel along the second direction satisfies 0.2mm≤H≤0.55mm.

3. The battery cover plate according to claim 1, characterized in that, The post bottom plate includes a first connecting plate, a second connecting plate and a fusing structure. 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 fusing structure is arranged between the first connecting plate and the second connecting plate.

4. The battery cover plate according to claim 3, characterized in that, A blocking through groove is formed on the fusing structure.

5. The battery cover plate according to claim 3, characterized in that, The conductive electrode post further includes an insulating rubber sleeve, which is arranged outside the fusing structure.

6. The battery cover plate according to claim 3, wherein, The first insulating member is further provided with a receiving groove. The first connecting plate, the second connecting plate and the fusing structure are all accommodated in the receiving groove. The receiving groove includes a first wall surface opposite to the post bottom plate along the second direction. Multiple heat dissipation through holes distributed in a grid shape are formed on the first wall surface.

7. The battery cover plate according to claim 6, characterized in that, The total area of the projections of the multiple heat dissipation through holes on the post bottom plate along the second direction is S, and the area of the welding mark is S1, and 0.1≤S1 / S≤0.25 is satisfied.

8. The battery cover plate according to claim 6, characterized in that, The receiving groove further includes two second wall surfaces opposite to the post bottom plate along the first direction. Limit protrusions for abutting against the post bottom plate are symmetrically distributed on the two second wall surfaces.

9. The battery cover plate according to claim 8, wherein, The number of the limit protrusions abutting against the first connecting plate on each second wall surface is greater than the number of the limit protrusions abutting against the second connecting plate.

10. A battery, characterized in that, The battery includes a battery cell group, a battery housing and the battery cover plate according to any one of claims 1-9. The battery housing is a cavity structure with an opening. The battery cover plate is arranged at the opening of the battery housing to seal the battery housing and form a receiving cavity for accommodating the battery cell group.

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