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, a conductive pole and a high temperature resistant patch, the conductive pole comprises a pole main body and a pole bottom plate, one side of the pole bottom plate deviating from the first insulating part is welded with a tab, one part of the tab is welded on the pole bottom plate, and the other part of the tab is welded on the high temperature resistant patch. The other part of the tab extends in the first direction and exceeds the pole bottom plate, and the high-temperature-resistant patch is attached to the side, facing the first insulating part, of the tab and located on the part, exceeding the pole bottom plate, of the tab. The heat of the tabs is blocked through the high-temperature-resistant patches, so that first thermal isolation is realized, the tabs cannot be tightly attached to the first insulating parts through the high-temperature-resistant patches, and gaps are formed between the tabs and the first insulating parts, so that an air thermal insulation layer is formed, and second thermal isolation is realized; the heat influence on the first insulating part during welding is greatly reduced by using a dual thermal isolation mode, 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 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, the explosion-proof valve is used to allow the high-temperature and high-pressure gas inside the battery to break through the explosion-proof valve when thermal runaway occurs inside the battery, thereby achieving the purpose of pressure relief and protection. The plastic part is used to insulate the conductive electrode post and the light aluminum plate, avoiding direct contact between the electrode post and the electrode tab and the light aluminum plate, and thus preventing short circuits. Therefore, the explosion-proof valve and the insulating part are important components to ensure the safe use of the battery.

[0004] Since a part of the electrode tab is welded to the conductive electrode post and the other part of the electrode tab directly abuts against the plastic part, when the electrode tab is welded to the conductive electrode post, the heat generated by the welding will cause the temperature of the electrode tab to rise rapidly, resulting in the plastic part in contact with the electrode tab being heated and deformed, extending horizontally. On the one hand, this causes the thickness of the plastic part to decrease, increasing the probability of the plastic part being punctured and causing a short circuit, and the insulation ability is poor. On the other hand, since the insulating part extends horizontally, the outer dimension of the battery cover plate will increase, resulting in difficulty in smoothly assembling into the shell, 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, which have good insulation protection and 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, on which an insertion through hole is provided;

[0009] A conductive electrode post, which includes a post main body and a post bottom plate. The post main body is inserted into the insertion through hole. The side of the post bottom plate facing away from the first insulating part is welded to the electrode tab. A part of the electrode tab is welded to the post bottom plate, and the other part of the electrode tab extends along a first direction and extends beyond the post bottom plate;

[0010] A high-temperature resistant patch, which is attached to the side of the electrode tab facing the first insulating part and is located on the part of the electrode tab extending beyond the post bottom plate;

[0011] The length dimension of the high-temperature resistant patch along the first direction is W1, and the length dimension of the part of the tab exceeding the tab bottom plate along the first direction is W2, and 0.4 ≤ W1 / W2 ≤ 0.7 is satisfied.

[0012] Optionally, the length dimension W1 of the high-temperature resistant patch along the first direction satisfies 12 mm ≤ W1 ≤ 25 mm.

[0013] Optionally, the width dimension of the high-temperature resistant patch along the second direction is L, and 8 mm ≤ L ≤ 15 mm is satisfied.

[0014] Optionally, the thickness dimension of the high-temperature resistant patch along the third direction is T, and 0.15 mm ≤ T ≤ 0.3 mm is satisfied.

[0015] Optionally, the tab bottom plate includes a first connecting plate, a second connecting plate and a fusing structure. The first connecting plate is connected to the tab body, the second connecting plate is welded to the tab on the side facing away from the first insulating member, and the fusing structure is disposed between the first connecting plate and the second connecting plate.

[0016] Optionally, a blocking through groove is formed in the fusing structure.

[0017] Optionally, the tab electrode column further includes an insulating rubber sleeve, and the insulating rubber sleeve is sleeved outside the fusing structure.

[0018] 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, and a plurality of limiting protrusions abutting against the tab bottom plate are provided on two opposite wall surfaces of the receiving groove along the second direction.

[0019] Optionally, the number of the limiting protrusions abutting against the first connecting plate is greater than the number of the limiting protrusions abutting against the second connecting plate.

[0020] On the other hand, a battery is provided. The battery 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 and form a cavity for receiving the battery cell group.

[0021] Advantages of the present invention:

[0022] The present invention provides a battery cover plate. By attaching a high-temperature resistant patch to the part of the tab that extends beyond the tab bottom plate in the first direction, the high-temperature resistant patch is used to block the heat of the tab, preventing the heat on the tab from being transferred to the first insulating part, thereby achieving the first layer of thermal isolation. And by setting the high-temperature resistant patch, the tab cannot be closely attached to the first insulating part, thus forming a gap between the tab and the first insulating part to form an air heat insulation layer, achieving the second layer of thermal isolation. By using the double thermal isolation method, the thermal influence on the first insulating part during welding is greatly reduced, thereby avoiding the deformation of the first insulating part due to the excessive temperature of the tab, improving the insulation performance and assembly processability. And by limiting the length dimension W1 of the high-temperature resistant patch in the first direction and the length dimension W2 of the part of the tab that extends beyond the tab bottom plate in the first direction, so that the two satisfy 0.4 ≤ W1 / W2 ≤ 0.7. On the one hand, this can avoid the too small length of the high-temperature resistant patch covering the tab in the first direction, resulting in poor heat insulation effect and reducing the heat insulation and protection effect on the first insulating part. On the other hand, it can avoid the too large length of the high-temperature resistant patch covering the tab in the first direction, causing the high-temperature resistant patch to cover the part of the tab with a lower temperature, resulting in material waste and increased manufacturing cost.

[0023] The present invention also provides a battery. By applying the above-mentioned 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the structural exploded view of the battery cover plate provided by the present invention;

[0025] Figure 2 is the cross-sectional view of the battery cover plate provided by the present invention after being welded with the tab;

[0026] Figure 3 is the plan view of the high-temperature resistant patch provided by the present invention disposed on the tab;

[0027] Figure 4 is the connection schematic diagram among the conductive tab, the high-temperature resistant patch and the tab provided by the present invention;

[0028] Figure 5 is the structural schematic diagram of the first insulating part in the battery cover plate provided by the present invention;

[0029] Figure 6 is the structural schematic diagram of the conductive tab in the battery cover plate provided by the present invention.

[0030] In the figure:

[0031] 100. Tab;

[0032] 1. First insulating part; 11. Insertion through hole; 12. Accommodating groove; 13. Limiting protrusion;

[0033] 2. Conductive electrode post; 21. Post main body; 22. Post bottom plate; 221. First connecting plate; 222. Second connecting plate; 223. Fusing structure; 224. Blocking through groove; 23. Insulating rubber sleeve;

[0034] 3. High-temperature resistant patch;

[0035] 4. Cover plate body;

[0036] 5. Second insulating part;

[0037] 6. Connecting block. Specific embodiments

[0038] 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 the parts related to the present invention are shown in the drawings, rather than all the 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 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 simply means that the horizontal height of the first feature is higher than that of 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 simply means 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 "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying the operations, 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 meanings.

[0042] Since a part of the tab is welded to the conductive electrode post and the other part of the tab directly abuts against the plastic part, when the tab is welded to the conductive electrode post, the heat generated by the welding will cause the temperature of the tab to rise rapidly, resulting in the plastic part in contact with the tab being heated and deformed and extending in the horizontal direction. On the one hand, it causes the thickness of the plastic part to decrease, increasing the probability of the plastic part being punctured and causing a short circuit, and the insulation ability is poor. On the other hand, after the insulating part extends in the horizontal direction, it will cause the outer dimension of the battery cover plate to increase, resulting in the inability to be smoothly assembled into the shell, and the assembly processability is poor.

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

[0044] As Figures 1 to 6 shown, the battery cover plate includes a first insulating part 1, a conductive electrode post 2 and a high-temperature resistant patch 3. The first insulating part 1 is provided with an insertion through hole 11. The conductive electrode post 2 includes a post body 21 and a post bottom plate 22. The post body 21 is inserted into the insertion through hole 11. The side of the post bottom plate 22 facing away from the first insulating part 1 is welded to the tab 100. A part of the tab 100 is welded to the post bottom plate 22, and the other part of the tab 100 extends in the first direction and extends beyond the post bottom plate 22. The high-temperature resistant patch 3 is attached to the side of the tab 100 facing the first insulating part 1 and is located on the part of the tab 100 that extends beyond the post bottom plate 22. The length dimension of the high-temperature resistant patch 3 in the first direction is W1, and the length dimension of the part of the tab 100 that extends beyond the post bottom plate 22 in the first direction is W2, and 0.4 ≤ W1 / W2 ≤ 0.7 is satisfied.

[0045] The battery cover plate is provided with a high-temperature resistant patch 3 on the part where the tab 100 extends beyond the tab bottom plate 22 along the first direction. By using the high-temperature resistant patch 3 to block the heat of the tab 100, the heat on the tab 100 is prevented from being transferred to the first insulating member 1, thereby achieving the first layer of heat isolation. And by setting the high-temperature resistant patch 3, the tab 100 cannot be closely attached to the first insulating member 1, thus forming a gap between the tab 100 and the first insulating member 1 to form an air heat insulation layer and achieve the second layer of heat isolation. The use of double heat isolation greatly reduces the heat influence on the first insulating member 1 during welding, thereby avoiding the deformation of the first insulating member 1 due to the excessive temperature of the tab 100, improving the insulation performance and assembly processability. And by limiting the length dimension W1 of the high-temperature resistant patch 3 along the first direction and the length dimension W2 of the part where the tab 100 extends beyond the tab bottom plate 22 along the first direction, the two satisfy 0.4 ≤ W1 / W2 ≤ 0.7. On the one hand, this avoids that the length of the high-temperature resistant patch 3 covering the tab 100 along the first direction is too small, resulting in poor heat insulation effect and reducing the heat insulation and protection effect on the first insulating member 1. On the other hand, it avoids that the length of the high-temperature resistant patch 3 covering the tab 100 along the first direction is too large, so that the high-temperature resistant patch 3 covers the part with a lower temperature of the tab 100, causing material waste and increasing the manufacturing cost.

[0046] The shape of the high-temperature resistant patch 3 can be freely set according to requirements, such as circular, rectangular or oval, etc. In this embodiment, the high-temperature resistant patch 3 is rectangular. And the high-temperature resistant patch 3 is made of a material with high heat resistance and insulation, such as PAI / PI / PEEK, etc.

[0047] In this embodiment, as Figure 1 shown, the battery cover plate further includes a cover plate body 4, a second insulating member 5 and a connecting block 6. The cover plate body 4 is provided with a connecting through hole corresponding to the insertion through hole 11. One end of the tab main body 21 passing through the insertion through hole 11 is inserted into the connecting through hole and connected to the connecting block 6. The second insulating member 5 is arranged on the side of the cover plate body 4 facing away from the first insulating member 1 and is used to realize the insulation protection among the cover plate body 4, the tab main body 21 and the connecting block 6. In addition, in order to ensure the firmness when the first insulating member 1 is connected to the cover plate body 4, the first insulating member 1 is provided with a positioning protrusion outside the insertion through hole 11, and the cover plate body 4 is provided with a positioning through hole adapted to the positioning protrusion, and the positioning protrusion is inserted into the positioning through hole.

[0048] 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 6 is welded to the pole column body 21. When the battery cover plate is a riveted cover plate, the connecting block 6 is riveted to the pole column body 21. And the battery cover plate of this structure can adapt to different types of batteries by changing the number of conductive pole columns 2. When there is one conductive pole column 2 on the battery cover plate, the battery cover plate is adapted to a blade battery. When there are two conductive pole columns 2 on the battery cover plate, the battery cover plate is adapted to a square shell battery.

[0049] In this embodiment, the conductive pole column 2 provided with the fusing structure 223 is generally the positive pole column. Because the negative terminal ear is generally made of copper, the negative pole column connected to the negative terminal ear is generally also made of copper. And the thermal conductivity of copper is higher, so there is no need to set the fusing structure 223 on the negative pole column to avoid waste of resources and reduce the manufacturing cost. In order to prevent the fusing structure 223 from melting when welding the terminal ear 100 and the pole column bottom plate 22, the melting point of the fusing structure 223 is greater than the temperature when welding the terminal ear 100 and the pole column bottom plate 22, and not greater than the temperature when a short circuit occurs.

[0050] Optionally, the length dimension W1 of the high-temperature resistant patch 3 along the first direction satisfies 12mm ≤ W1 ≤ 25mm. By limiting the length dimension W1 of the high-temperature resistant patch 3 along the first direction to satisfy 12mm ≤ W1 ≤ 25mm, on the one hand, it can avoid that the length of the high-temperature resistant patch 3 covering the terminal ear 100 along the first direction is too small, resulting in poor heat insulation effect and reducing the heat insulation and protection effect on the first insulating part 1, causing the first insulating part 1 to be scalded when welding the terminal ear 100 and the pole column bottom plate 22. On the other hand, it can avoid that the length of the high-temperature resistant patch 3 covering the terminal ear 100 along the first direction is too large, thus compressing the welding area of the terminal ear 100 and the pole column bottom plate 22 and reducing the connection strength.

[0051] Optionally, the width dimension of the high-temperature resistant patch 3 along the second direction is L, and satisfies 8mm ≤ L ≤ 15mm. By limiting the width dimension L of the high-temperature resistant patch 3 along the second direction to satisfy 8mm ≤ L ≤ 15mm, it can avoid that the width of the high-temperature resistant patch 3 covering the terminal ear 100 along the second direction is too small, resulting in poor heat insulation effect and reducing the heat insulation and protection effect on the first insulating part 1, causing the first insulating part 1 to be scalded when welding the terminal ear 100 and the pole column bottom plate 22. On the other hand, it can avoid that the width of the high-temperature resistant patch 3 covering the terminal ear 100 along the second direction is too large, resulting in exceeding the terminal ear 100 and affecting the assembly.

[0052] Optionally, the thickness dimension T of the high-temperature resistant patch 3 in the third direction is T, and satisfies 0.15 mm ≤ T ≤ 0.3 mm. By defining the thickness dimension T of the high-temperature resistant patch 3 in the third direction to satisfy 0.15 mm ≤ T ≤ 0.3 mm, on the one hand, it is avoided that the thickness of the high-temperature resistant patch 3 is too small, resulting in poor heat insulation and protection effect, and the first insulating member 1 is scalded when the tab 100 is welded to the pole bottom plate 22. On the other hand, it is avoided that the thickness of the high-temperature resistant patch 3 is too large, resulting in too large a gap between the tab 100 and the first insulating member 1, and the stability of the tab 100 is poor, so that the tab 100 shakes during welding, resulting in poor welding.

[0053] Wherein, the thickness dimension T of the high-temperature resistant patch 3 in the third direction can be any value between 0.15 mm and 0.3 mm or the range between any two values, such as 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0054] Optionally, the pole bottom plate 22 includes a first connecting plate 221, a second connecting plate 222 and a fusing structure 223. The first connecting plate 221 is connected to the pole body 21, the side of the second connecting plate 222 facing away from the first insulating member 1 is welded to the tab 100, and the fusing structure 223 is arranged between the first connecting plate 221 and the second connecting plate 222. The pole bottom plate 22 is formed by the first connecting plate 221, the second connecting plate 222 and the fusing structure 223, so that in the event of a short circuit, the fusing structure 223 is melted by the generated high temperature, thereby realizing the disconnection between the pole body 21 connected to the first connecting plate 221 and the tab 100 connected to the second connecting plate 222, thereby improving the safety protection performance. And because the first connecting plate 221 and the second connecting plate 222 are connected through the fusing structure 223, its heat conduction ability has a smaller heat dissipation area and a worse heat conduction ability compared with the pole bottom plate 22 composed of an integral metal plate. Therefore, by setting the high-temperature resistant patch 3 on the tab 100, the heat influence on the first insulating member 1 during the welding operation is reduced, and the first insulating member 1 is prevented from deforming due to the too high temperature of the tab 100, improving the insulation performance and the assembly processability.

[0055] In this embodiment, the conductive pole 2 provided with the fusing structure 223 is generally the positive pole, because the negative tab is generally made of copper, so the negative pole 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 223 on the negative pole to avoid waste of resources and reduce the manufacturing cost. Among them, in order to prevent the fusing structure 223 from melting when the tab 100 is welded to the pole bottom plate 22, the melting point of the fusing structure 223 is greater than the temperature when the tab 100 is welded to the pole bottom plate 22 and not greater than the temperature during a short circuit.

[0056] Among them, in order to verify the limitation of the length dimension W1 of the high-temperature resistant patch 3 in the first direction and the length dimension W2 of the part of the tab 100 exceeding the tab bottom plate 22 in the first direction, as well as the limitation of the thickness dimension T of the high-temperature resistant patch 3 in the third direction, for the thermal influence and welding condition of the first insulating member 1 in the battery cover plate with the fusing structure 223, six groups of examples and four groups of comparative examples are provided in Table 1 for verification. Among them, the conducting tab 2 is the positive tab welded to the positive electrode tab, and the tab bottom plate 22 of the conducting tab 2 is provided with a fusing structure 223. The material of the first insulating member 1 in contact with the tab bottom plate 22 is the industry general material PP (melting point temperature 160°C - 170°C), and the welding power of the tab 100 and the tab bottom plate 22 is 1000W for all cases.

[0057] Table 1

[0058]

[0059] As can be seen from Examples 1 to 6 in Table 1, when the limitation of the length dimension W1 of the high-temperature resistant patch 3 in the first direction and the length dimension W2 of the part of the tab 100 exceeding the tab bottom plate 22 in the first direction satisfy the range of 0.4 ≤ W1 / W2 ≤ 0.7, at this time, the area covered by the high-temperature resistant patch 3 is large enough, and the insulation protection for the first insulating member 1 is strong, avoiding the first insulating member 1 from being scalded during welding; when the thickness dimension T of the high-temperature resistant patch 3 in the third direction satisfies 0.15mm ≤ T ≤ 0.3mm, at this time, the high-temperature resistant patch 3 has sufficient thickness to provide heat insulation protection for the first insulating member 1, but at the same time, it avoids too large a gap between the first insulating member 1 and the tab 100, which may cause the tab 100 to be unstable during welding and result in poor welding.

[0060] As can be seen from Comparative Example 1 in Table 1, when the limitation of the length dimension W1 of the high-temperature resistant patch 3 in the first direction and the length dimension W2 of the part of the tab 100 exceeding the tab bottom plate 22 in the first direction is less than the minimum value of 0.4 ≤ W1 / W2 ≤ 0.7, at this time, the length of the high-temperature resistant patch 3 covering the tab 100 in the first direction is too small, resulting in poor heat insulation effect and the first insulating member 1 being scalded.

[0061] As can be seen from Comparative Example 2 in Table 1, when the limitation of the length dimension W1 of the high-temperature resistant patch 3 in the first direction and the length dimension W2 of the part of the tab 100 exceeding the tab bottom plate 22 in the first direction is greater than the maximum value of 0.4 ≤ W1 / W2 ≤ 0.7, at this time, the length of the high-temperature resistant patch 3 covering the tab 100 in the first direction is too large, causing the high-temperature resistant patch 3 to cover the part of the tab 100 with a lower temperature, resulting in material waste and increased manufacturing cost.

[0062] As can be seen from Comparative Example 3 in Table 1, when the thickness dimension T of the high-temperature resistant patch 3 along the third direction is less than the minimum value of 0.15 mm ≤ T ≤ 0.3 mm, the thickness of the high-temperature resistant patch 3 is too small at this time, resulting in poor heat insulation and protection effects, and causing the first insulating member 1 to be scalded when the tab 100 is welded to the pole bottom plate 22.

[0063] As can be seen from Comparative Example 4 in Table 1, when the thickness dimension T of the high-temperature resistant patch 3 along the third direction is greater than the maximum value of 0.15 mm ≤ T ≤ 0.3 mm, the thickness of the high-temperature resistant patch 3 is too large at this time, resulting in too large a gap between the tab 100 and the first insulating member 1, and the stability of the tab 100 is poor, causing the tab 100 to shake during welding and resulting in poor welding.

[0064] Optionally, a blocking through groove 224 is formed in the fusing structure 223. By forming the blocking through groove 224 in the fusing structure 223, the cross-sectional area of the fusing structure 223 is reduced, so that in the event of a short circuit, due to the smaller cross-section, the heat generation is accelerated, thereby achieving early fusing, and its protection performance is better. However, since the cross-sectional area of the fusing structure 223 is smaller after the blocking through groove 224 is formed, it is more necessary to use the high-temperature resistant patch 3 to reduce the thermal influence of the high temperature generated during the welding of the second connecting plate 222 and the tab 100 on the first insulating member 1.

[0065] Optionally, the conductive pole 2 further includes an insulating rubber sleeve 23, and the insulating rubber sleeve 23 is sleeved outside the fusing structure 223. By arranging the insulating rubber sleeve 23 outside the fusing structure 223, on the one hand, it plays an insulating and protective role to avoid arcing due to too small a gap between the first connecting plate 221 and the second connecting plate 222, and on the other hand, in the event of a short circuit, since the insulating rubber sleeve 23 is arranged outside the fusing structure 223, it avoids the residue after the fusing structure 223 melts from falling into the battery interior and causing damage.

[0066] Optionally, a receiving groove 12 is further formed in the first insulating member 1, and the first connecting plate 221, the second connecting plate 222 and the fusing structure 223 are all received in the receiving groove 12. A plurality of limiting protrusions 13 abutting against the pole bottom plate 22 are provided on two opposite wall surfaces of the receiving groove 12 along the second direction. By forming the receiving groove 12 in the first insulating member 1, the pole bottom plate 22 is received in the receiving groove 12, 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, and by providing the limiting protrusions 13 abutting against the pole bottom plate 22 on two opposite wall surfaces of the receiving groove 12 along the second direction, the position of the pole bottom plate 22 is limited and fixed, avoiding dislocation of the pole bottom plate 22 during the welding of the pole bottom plate 22 and the tab 100 and resulting in poor welding problems.

[0067] In this embodiment, since the pole column bottom plate 22 includes a first connection plate 221 and a second connection plate 222, it is necessary to provide limiting protrusions 13 on the second wall surface that are respectively in contact with the first connection plate 221 and the second connection plate 222 to ensure the firmness of the fixation with the pole column bottom plate 22. The number of limiting protrusions 13 provided on a single second wall surface can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 13 are provided on each second wall surface to be in contact with the first connection plate 221, and one limiting protrusion 13 is provided to be in contact with the second connection plate 222.

[0068] Optionally, the number of limiting protrusions 13 in contact with the first connection plate 221 is greater than the number of limiting protrusions 13 in contact with the second connection plate 222. The reason why the number of limiting protrusions 13 in contact with the first connection plate 221 is greater than the number of limiting protrusions 13 in contact with the second connection plate 222 is that the temperature of the first connection plate 221 is lower than that of the second connection plate 222. Therefore, it is avoided that the limiting protrusions 13 are melted by heat, resulting in ineffective fixation of the pole column bottom plate 22.

[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 embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting 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 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 plate includes: A first insulating member, in which an insertion through-hole is formed; A conductive electrode post, which includes a post body and a post bottom plate. The post body is inserted into the insertion through-hole. The side of the post bottom plate facing away from the first insulating member is welded to a tab. A part of the tab is welded to the post bottom plate, and the other part of the tab extends along a first direction and extends beyond the post bottom plate; A high-temperature resistant patch, which is attached to the side of the tab facing the first insulating member and is located on the part of the tab that extends beyond the post bottom plate; The length dimension of the high-temperature resistant patch along the first direction is W1, the length dimension of the part of the tab that extends beyond the post bottom plate along the first direction is W2, and 0.4 ≤ W1 / W2 ≤ 0.7 is satisfied.

2. The battery cover plate according to claim 1, characterized in that, The length dimension W1 of the high-temperature resistant patch along the first direction satisfies 12 mm ≤ W1 ≤ 25 mm.

3. The battery cover plate according to claim 1, wherein, The width dimension of the high-temperature resistant patch along a second direction is L, and 8 mm ≤ L ≤ 15 mm is satisfied.

4. The battery cover plate according to claim 1, wherein, The thickness dimension of the high-temperature resistant patch along a third direction is T, and 0.15 mm ≤ T ≤ 0.3 mm is satisfied.

5. 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.

6. The battery cover plate according to claim 5, wherein, A blocking through-groove is formed in the fusing structure.

7. The battery cover plate according to claim 5, wherein, The conductive electrode post further includes an insulating rubber sleeve, which is sleeved outside the fusing structure.

8. The battery cover plate according to claim 5, wherein, An accommodating groove is further formed in the first insulating member. The first connecting plate, the second connecting plate and the fusing structure are all accommodated in the accommodating groove. A plurality of limiting protrusions abutting against the post bottom plate are arranged on two opposite wall surfaces of the accommodating groove along the second direction.

9. The battery cover plate according to claim 8, characterized in that, The number of the limiting protrusions abutting against the first connecting plate is greater than the number of the limiting protrusions abutting against the second connecting plate.

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

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