Cover plate assembly and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a cover plate assembly and a battery, the cover plate assembly comprises a cover plate body, a pole, a bottom plate and a protection piece, the pole is arranged on the cover plate body, the pole is connected with the bottom plate, the bottom plate comprises a fusing section, and the pole is arranged on one side of the fusing section; and the protection piece is arranged at the joint of one end, facing the bottom plate, of the pole and the bottom plate. Thus, by arranging the protection piece at the joint of the pole and the bottom plate, welding slag generated during welding can be prevented from falling into the pole group, the situation that the welding slag pierces the diaphragm and causes short circuit in the battery cell is avoided, the protection piece can support the joint of the pole and the bottom plate, and the connection stability and sealing performance of the pole and the bottom plate are improved; and the safety of the battery is further improved.

Description

Technical Field

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

[0002] A battery is a common energy storage device. As a power battery, a lithium-ion battery is widely used in electric vehicles and the energy storage field.

[0003] In a ternary cathode lithium-ion battery, an Fuse structure is usually provided to prevent overcurrent and avoid short circuit or overload from damaging the circuit. In order to cut off the circuit in time after the Fuse structure melts, the tab and the terminal are usually arranged on both sides of the Fuse structure and are electrically connected through a terminal bottom plate. Since the terminal bottom plate is long and narrow, the cost of integrally forming the terminal and the terminal bottom plate is relatively high. In order to save costs and improve material utilization rate, the terminal and the terminal bottom plate are designed as a split type.

[0004] The split-type terminal and the terminal bottom plate are fixedly connected by welding. During the welding process, welding slag will be formed on the welding surface. When assembling the battery cell, this welding surface faces the battery cell. Therefore, the remaining welding slag is very likely to fall off under working conditions such as vibration and fall into the inside of the electrode assembly, which may pierce the separator and cause internal short circuit of the battery cell, thus affecting the normal operation of the battery. Summary of the Invention

[0005] The purpose of the present invention is to provide a cover plate assembly and a battery to solve the problem that welding slag is likely to remain after welding the split-type terminal and the terminal bottom plate.

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

[0007] In a first aspect, a cover plate assembly includes: a cover plate body; a terminal and a bottom plate, the terminal is arranged on the cover plate body, the terminal is connected to the bottom plate, the bottom plate includes a fusing section, and the terminal is arranged on one side of the fusing section; a protection member, the protection member is arranged at the connection between one end of the terminal facing the bottom plate and the bottom plate.

[0008] Preferably, the terminal is seam-welded to the bottom plate, and the protection member covers the welding area.

[0009] Preferably, the bottom plate further includes a first conductive section and a second conductive section. Along the length direction of the bottom plate, the first conductive section, the fusing section, and the second conductive section are arranged in sequence, and the terminal is arranged on the first conductive section.

[0010] Preferably, the terminal is provided with a first groove, the first conductive section is provided with a second groove, and the first groove and the second groove cooperate to form a limiting groove for accommodating the protection member.

[0011] Preferably, the thickness of the bottom plate is H1, and 1.00 mm ≤ H1 ≤ 3.00 mm is satisfied. The depth of the limiting groove is H2, and 0.10 mm ≤ H2 ≤ 0.2H1 is satisfied.

[0012] Preferably, the thickness of the protection member is H3, and H2 ≤ H3 ≤ H2 + 2.00 mm is satisfied.

[0013] Preferably, the protection member is a protection patch, and the protection patch is adhesively connected to both the pole post and the bottom plate.

[0014] Preferably, the end face of the protection patch facing away from the cover body is flush with the end face of the bottom plate facing away from the cover body, or the end face of the protection patch facing away from the cover body protrudes from the end face of the bottom plate facing away from the cover body.

[0015] Preferably, the thickness of the bottom plate is greater than or equal to 1.00 mm.

[0016] In a second aspect, a battery includes a battery cell, a housing, and the cover assembly as described above. The battery cell is disposed inside the housing. The housing is connected to the cover body, and the protection member is disposed on a side of the cover body facing the battery cell.

[0017] Advantages of the present invention:

[0018] A cover assembly includes a cover body, a pole post, a bottom plate, and a protection member. The pole post is disposed on the cover body, the pole post is connected to the bottom plate, the bottom plate includes a fusing section, and the pole post is disposed on one side of the fusing section; the protection member is disposed at a connection between one end of the pole post facing the bottom plate and the bottom plate.

[0019] In this way, the fusing section can ensure that the circuit is cut off in time when the current is overcurrent. Disposing the pole post on one side of the fusing section helps to fixedly connect the pole post and the bottom plate by welding. The protection member can provide protection and support to the connection between the pole post and the bottom plate, and block the remaining welding slag from falling into the inside of the battery pack, thereby reducing the situation where the welding slag pierces the separator and causes an internal short circuit of the battery cell, further improving the connection stability and sealing performance between the pole post and the bottom plate, avoiding electrolyte leakage caused by poor welding at the pole post and the bottom plate, and improving the stability and safety of the overall structure of the cover assembly. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a cover assembly in an embodiment of the present invention;

[0021] Figure 2 is a bottom view of a cover assembly in an embodiment of the present invention;

[0022] Figure 3It is a partial cross-sectional view of the cover plate assembly in an embodiment of the present invention;

[0023] Figure 4 It is in an embodiment of the present invention Figure 3 An enlarged view of part A;

[0024] Figure 5 It is the first partial cross-sectional view of the cover plate assembly in an embodiment of the present invention;

[0025] Figure 6 It is the first partial side view of the cover plate assembly in an embodiment of the present invention;

[0026] Figure 7 It is the second partial cross-sectional view of the cover plate assembly in an embodiment of the present invention;

[0027] Figure 8 It is the second partial side view of the cover plate assembly in an embodiment of the present invention.

[0028] In the figure:

[0029] 1. Cover plate body; 2. Terminal post; 21. First groove; 22. Connecting part; 3. Bottom plate; 31. Fusing section; 32. First conductive section; 321. Second groove; 322. Connecting groove; 33. Second conductive section; 4. Protective part; 5. Riveting block; 6. Upper plastic; 7. Lower plastic. Detailed implementation manners

[0030] 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. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0031] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", 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 circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] See also Figure 1 and Figure 2 The present invention provides a cover plate assembly, including a cover plate body 1, a pole 2, a bottom plate 3 and a protective member 4, wherein the pole 2 is arranged on the cover plate body 1, the pole 2 is connected to the bottom plate 3, the bottom plate 3 includes a fuse section 31, and the pole 2 is arranged on one side of the fuse section 31; the protective member 4 is arranged at the connection between one end of the pole 2 facing the bottom plate 3 and the bottom plate 3.

[0035] In this embodiment, the bottom plate 3 is arranged on the side of the cover body 1 facing the battery cell (not shown in the figure), and the pole 2 is arranged through the bottom plate 3 and the cover body 1, so that the two ends of the pole 2 are respectively located on both sides of the cover body 1, and the two ends of the pole 2 are respectively fixedly connected to the bottom plate 3 and the cover body 1. The cover assembly also includes a rivet block 5, an upper plastic 6 and a lower plastic 7. The end of the pole 2 facing away from the bottom plate 3 is electrically connected to the rivet block 5 to achieve connection with an external circuit. The upper plastic 6 is arranged between the rivet block 5 and the cover body 1, and the upper plastic 6 is provided with a groove for accommodating the rivet block 5 (not shown in the figure). The lower plastic 7 is arranged between the cover body 1 and the bottom plate 3. The length direction of the lower plastic 7 is parallel to the length direction of the cover body 1 to achieve insulation of the cover body 1.

[0036] Furthermore, the length direction of the fuse section 31 is perpendicular to the length direction of the bottom plate 3, and the bottom plate 3 on both sides of the fuse section 31 are electrically connected to the pole 2 and the pole ear respectively, that is, the pole 2 and the pole ear are electrically connected to the two ends of the bottom plate 3 respectively, the pole 2 is welded to the bottom plate 3, and the protective component 4 is connected to both the pole 2 and the bottom plate 3.

[0037] In this way, the protective member 4 can provide protection and support to the connection between the pole post 2 and the bottom plate 3. It can not only prevent the welding slag generated during welding from falling into the inside of the electrode group, avoid the welding slag piercing the separator and causing an internal short circuit of the battery cell, but also further improve the connection stability and sealing performance between the pole post 2 and the bottom plate 3, prevent loosening at the connection between the pole post 2 and the bottom plate 3 and leakage of the electrolyte, and improve the stability and safety of the overall structure of the cover assembly.

[0038] It can be understood that the setting position of the fusing section 31 can be adjusted according to actual needs, and it can be realized that the tab and the pole post 2 are located at both ends of the fusing section 31 to ensure that the fusing section 31 can cut off the circuit in time. The fusing section 31 can be a fuse structure or a thermistor structure. The setting position and specific structure of the fusing section 31 can be flexibly adjusted, and will not be listed in detail here.

[0039] Refer to Figures 2 to 4 , in some embodiments, the pole post 2 is welded at the seam on the bottom plate 3, and the protective member 4 is arranged to cover the welding area. In this embodiment, the welding area between the pole post 2 and the bottom plate 3 is arranged around the connection between the pole post 2 and the bottom plate 3.

[0040] In this way, the pole post 2 and the bottom plate 3 are fixedly connected by seam welding, which can prefabricate and process the pole post 2 and the bottom plate 3 respectively, avoid material waste, improve the sealing performance at the connection between the pole post 2 and the bottom plate 3, improve the connection stability between the pole post 2 and the bottom plate 3, and the protective member 4 is arranged to cover the welding area, which can block the welding slag in the welding area from falling, ensure the cleanliness of the welding area, avoid the welding slag falling into the inside of the electrode group and piercing the separator to cause an internal short circuit of the battery cell, and improve the safety and stability of the cover assembly.

[0041] Refer to Figure 5 and Figure 6 , in some embodiments, the bottom plate 3 further includes a first conductive section 32 and a second conductive section 33. Along the length direction of the bottom plate 3, the first conductive section 32, the fusing section 31, and the second conductive section 33 are arranged in sequence, and the pole post 2 is arranged on the first conductive section 32.

[0042] In this embodiment, the fusing section 31 is electrically connected to both the first conductive section 32 and the second conductive section 33, the tab is electrically connected to the second conductive section 33, the lower plastic 7 is provided with a groove (not shown in the figure) for accommodating the bottom plate 3, the end face of the bottom plate 3 facing away from the cover body 1 protrudes from the lower plastic 7, the first conductive section 32 is arranged at the end facing the cover body 1, so that the pole post 2 and the riveting block 5 are correspondingly arranged at the end facing the cover body 1, effectively utilizing the space of the cover body 1. The end of the pole post 2 facing the bottom plate 3 protrudes to be provided with a connecting portion 22, and a connecting groove 322 is provided on the surface of the bottom plate 3 facing the cover body 1 at the connecting portion 22, so that the pole post 2 and the bottom plate 3 are snap-connected.

[0043] In this way, the fusing section 31 can automatically fuse and cut off the circuit when the current abnormally increases, thereby protecting the battery cell from overcurrent damage. The pole post 2 is disposed on the first conductive section 32, and the bottom plate 3 is located in the groove of the lower plastic 7, which can limit the relative position of the bottom plate 3 and the lower plastic 7, avoiding situations such as offset or detachment after the pole post 2 and the bottom plate 3 are assembled to the cover body 1 and the lower plastic 7. The pole post 2 is snap-connected to the bottom plate 3, which can achieve preliminary positioning when the pole post 2 is assembled to the bottom plate 3, improving the connection stability between the pole post 2 and the cover body 1, and further improving the stability and safety of the cover assembly; the protective member 4 is correspondingly disposed on the first conductive section 32, which can block the welding slag in the welding area from falling, avoiding the welding slag from piercing the diaphragm and causing internal short circuit of the battery cell.

[0044] It can be understood that by reasonably designing the sizes and shapes of the first conductive section 32 and the second conductive section 33, the current distribution can be optimized, and the overall performance of the battery can be improved. The sizes of the first conductive section 32, the fusing section 31, and the second conductive section 33 can all be adjusted according to actual needs, which will not be elaborated here.

[0045] Refer to Figure 4 and Figure 5 , in some embodiments, the pole post 2 is provided with a first groove 21, and the first conductive section 32 is provided with a second groove 321. The first groove 21 and the second groove 321 cooperate to form a limiting groove for accommodating the protective member 4.

[0046] In this embodiment, the depth of the first groove 21 is equal to the depth of the second groove 321. The first groove 21 is formed on the pole post 2 by stamping, and the second groove 321 is formed on the first conductive section 32 by stamping. The shape of the limiting groove is adapted to the shape of the protective member 4 to limit the position of the protective member 4. The protective member 4 is fixedly disposed on the surface of the bottom plate 3 facing away from the cover body 1. The width of the limiting groove is not less than the width of the welding area, and the limiting groove extends along the thickness direction of the bottom plate 3.

[0047] In this way, by making the first groove 21 and the second groove 321 cooperate to form the limiting groove, the protective member 4 can provide sufficient protection for the limiting area, block the welding slag in the welding area from falling, and further limit the relative position of the pole post 2 and the bottom plate 3 at the same time, improving the stability and safety of the overall structure of the cover assembly, enabling the pole post 2 to achieve stable electrical connection with the pole ear through the bottom plate 3, and reducing the contact between the connection part of the pole post 2 and the bottom plate 3 and the outside under the action of the protective member 4, prolonging the service life of the pole post 2 and the bottom plate 3.

[0048] It can be understood that the widths of the first slot 21 and the second slot 321 may be equal or unequal. In this embodiment, the widths of the first slot 21 and the second slot 321 are equal for the convenience of separately processing the pole post 2 and the bottom plate 3 to form the adapted first slot 21 and second slot 321. The widths and depths of the first slot 21 and the second slot 321 can be adjusted according to actual design requirements and will not be elaborated here.

[0049] Referring to Figure 7 , in some embodiments, the thickness of the bottom plate 3 is H1 and satisfies 1.00 mm ≤ H1 ≤ 3.00 mm, and the depth of the limiting slot is H2 and satisfies 0.10 mm ≤ H2 ≤ 0.2H1.

[0050] In this embodiment, the thickness H1 of the bottom plate can be any value between 1.00 mm and 3.00 mm or the range between any two values, such as 1.00 mm, 1.50 mm, 2.00 mm, 2.50 mm, 3.00 mm, etc.

[0051] In this way, the bottom plate 3 can have sufficient structural strength so that it is not easily deformed or damaged when bearing a large current or external force, and enables the bottom plate 3 to be stably connected to the pole post 2; the bottom plate 3 has sufficient thickness to facilitate connecting the pole post 2 and the bottom plate 3 by means of butt welding, avoiding defects such as burn-through and false welding caused by the too thin bottom plate 3, realizing stable electrical connection with the pole post 2 and the pole ear, so that the battery cell can be electrically connected to the external circuit, improving the safety and stability of the battery; the limiting slot has a certain depth to realize the limitation of the protection member 4, so that the protection member 4 stably protects the connection between the pole post 2 and the bottom plate 3, avoiding the welding slag remaining in the welding area from falling off under working conditions such as vibration and falling into the inside of the electrode group to cause a short circuit of the battery cell, and improving the safety of the battery.

[0052] It can be understood that the thickness H1 of the bottom plate 3 cannot be too small, otherwise the overall structural strength of the bottom plate 3 will be low, making the connection between the fusing section 31 and the first conductive section 32 and the second conductive section 33 unstable. The thickness H1 of the bottom plate 3 cannot be too large either, otherwise the bottom plate 3 will occupy too much space, which is not conducive to arranging other structures; the depth H2 of the limiting slot cannot be too small, otherwise the limiting effect on the protection member 4 will become poor. The depth H2 of the limiting slot cannot be too large either, otherwise it will affect the structural strength of the pole post 2 and the bottom plate 3. The depth H2 of the limiting slot can be adjusted according to the sizes of the protection member 4, the pole post 2, and the bottom plate 3 and will not be elaborated here.

[0053] Referring to Figure 7 and Figure 8 , in some embodiments, the thickness of the protection member 4 is H3 and satisfies H2 ≤ H3 ≤ H2 + 2.00 mm.

[0054] In this way, by limiting the thickness H3 of the protective member 4 , the protective member 4 can have sufficient structural strength to protect the connection between the pole 2 and the bottom plate 3 without occupying too much space, thereby avoiding assembly interference with other components inside the housing.

[0055] It is understandable that the thickness H3 of the protective member 4 cannot be too large, otherwise the protective member 4 will protrude from the fuse section 31 and cause assembly interference. The thickness H3 of the protective member 4 cannot be too small, otherwise the protective effect will be reduced.

[0056] In order to verify the rationality of the ranges of the thickness H1 of the bottom plate 3 , the depth H2 of the limiting groove and the thickness H3 of the protective member 4 , as shown in Table 1, this embodiment provides nine groups of embodiments and eight groups of comparative examples for illustration.

[0057] Table 1

[0058]

[0059] It can be seen from Examples 1 to 9 in Table 1 that after meeting the range limitation, the protection patch does not protrude from the fuse section 31, which can have sufficient structural strength to provide protection and support for the connection between the pole 2 and the base plate 3 and avoid assembly interference.

[0060] It can be seen from Comparative Examples 1 and 2 in Table 1 that when the depth H2 of the limiting groove is too large, the structural strength of the pole 2 will be reduced, affecting assembly.

[0061] It can be seen from Comparative Examples 3 and 4 that when the depth H2 of the limiting groove is too small, it will be difficult for the limiting groove to limit the protective patch, increasing the risk of the protective patch falling off and affecting assembly.

[0062] It can be seen from Comparative Examples 5 and 6 that when the thickness H3 of the protection patch is too small, welding slag will easily pierce the protection patch, which will not play a protective role and affect assembly.

[0063] It can be seen from Comparative Examples 7 and 8 that when the thickness H3 of the protection patch is too large, the protection patch will protrude from the fuse section 31, which may easily interfere with other components inside the housing and affect assembly.

[0064] See also Figure 7 and Figure 8 In some embodiments, the thickness H1 of the bottom plate 3 is 1.00 mm, the depth H2 of the limiting groove is 0.10 mm, and the thickness H3 of the protective member 4 is 0.20 mm, that is, the protective member 4 is embedded in the limiting groove and protrudes from the surface of the bottom plate 3 away from the cover body 1.

[0065] Alternatively, see Figure 5 and Figure 6, in some other embodiments, the thickness H1 of the bottom plate 3 is 1.50 mm, the depth H2 of the limiting groove is 0.20 mm, and the thickness H3 of the protection member 4 is 0.20 mm. That is, the protection member 4 is embedded in the limiting groove and flush with the surface of the bottom plate 3 facing away from the cover body 1.

[0066] In this way, the relatively shallow limiting groove can not only limit the protection member 4, but also avoid affecting the structural strength of the pole post 2 and the bottom plate 3. The protection member 4 located in the limiting groove can be connected to both the pole post 2 and the bottom plate 3, further improving the connection stability between the pole post 2 and the bottom plate 3. The thickness H3 of the protection member 4 is greater than or equal to the depth H2 of the limiting groove, which can enable the protection member 4 to have sufficient structural strength to block the residual welding slag from falling, avoid the welding slag from falling off under working conditions such as vibration and falling into the inside of the electrode group, reduce the situation of the welding slag piercing the diaphragm and causing internal short circuit of the battery cell, and improve the safety and stability of the battery.

[0067] It can be understood that the end face of the pole post 2 facing away from the cover body 1 can also be flush with the end face of the bottom plate 3 facing away from the cover body 1. That is, the protection member 4 is directly arranged at the connection between the pole post 2 and the bottom plate 3. In this embodiment, the protection member 4 is arranged in the limiting groove to facilitate the rapid assembly of the protection member 4 to the connection between the pole post 2 and the bottom plate 3, reduce the adjustment time during the installation process, improve the assembly efficiency, and avoid the protection member 4 from shifting and being unable to cover the welding area, thereby improving the blocking effect of the protection member 4 on the residual welding slag in the welding area.

[0068] Refer to Figure 5 , in some embodiments, the protection member 4 is a protection patch, and the protection patch is adhesively connected to both the pole post 2 and the bottom plate 3.

[0069] In this embodiment, the cross-sectional shape of one end of the pole post 2 facing away from the cover body 1 is circular. Therefore, the welding area between the pole post 2 and the bottom plate 3 is annular. Correspondingly, the cross-sections of the limiting groove and the protection patch are both annular. The protection patch is made of PET (Polyethylene Terephthalate), and the protection patch is adhesively bonded to the welding area between the pole post 2 and the bottom plate 3 and is located in the limiting groove.

[0070] In this way, the limiting groove can facilitate the staff to position the protection patch. The protection patch is adhesively arranged in the limiting groove, which can improve the assembly efficiency. And the limiting groove can limit the protection patch to prevent the protection patch from shifting during subsequent use, so that the protection patch can closely fit the welding area, form a closed protection space, block the welding slag in the welding area from falling, and improve the sealing performance and connection stability at the connection between the pole post 2 and the bottom plate 3, avoid the welding slag from falling off and falling into the inside of the electrode group resulting in the diaphragm being pierced, and improve the safety of the battery.

[0071] It can be understood that the protective member 4 can also be a protective cover plate provided on the lower plastic 7 or a coating applied to the connection between the terminal post 2 and the bottom plate 3, and is not limited to the protective patch. In this embodiment, the protective member 4 is a protective patch, which is to improve the assembly efficiency of the protective member 4 and enable the welding slag to be blocked by the protective patch. The specific structure of the protective member 4 can be adjusted according to actual needs and will not be listed in detail here.

[0072] Referring to Figure 5 and Figure 6 , in some embodiments, the end face of the protective patch facing away from the cover plate body 1 is flush with the end face of the bottom plate 3 facing away from the cover plate body 1, that is, the thickness H3 of the protective patch is equal to the depth H2 of the limiting groove.

[0073] In this way, when the protective patch is attached to the connection between the terminal post 2 and the bottom plate 3, the protective patch can be in close contact with both the terminal post 2 and the bottom plate 3, preventing the welding slag from falling off through the gap between the protective patch and the terminal post 2 or the bottom plate 3. The limiting groove can accommodate and limit the protective patch, preventing the protective patch from shifting. Moreover, the shape of the protective patch is adapted to the shape of the limiting groove, enabling the side wall of the protective patch to be in contact with the inner wall of the limiting groove, improving the sealing performance and connection stability at the connection between the terminal post 2 and the bottom plate 3.

[0074] It can be understood that, referring to Figure 7 and Figure 8 , the end face of the protective patch facing away from the cover plate body 1 can also protrude from the end face of the bottom plate 3 facing away from the cover plate body 1, that is, the thickness H3 of the protective patch is greater than the depth H2 of the limiting groove. When the thickness of the bottom plate 3 is small, the protective patch can protrude from the bottom plate 3 to enhance the protection and support of the protective patch. When the thickness of the bottom plate 3 is large, the protective patch is flush with the bottom plate 3, which can reduce the utilization of the space on the side of the bottom plate 3 facing the battery cell. The thickness H3 of the protective patch can be adjusted according to the thickness H1 of the bottom plate 3 and will not be elaborated here.

[0075] Referring to Figure 2 , the present invention also provides a battery, including a battery cell, a housing (not shown in the figure), and a cover plate assembly. The battery cell is disposed inside the housing, the housing is connected to the cover plate body 1, and the protective member 4 is disposed on the side of the cover plate body 1 facing the battery cell.

[0076] In this embodiment, there are two cover plate assemblies, which are respectively disposed at both ends of the housing. The cover plate assemblies and the housing enclose a sealed space for accommodating the battery cell.

[0077] In this way, by providing the protective patch, it can be avoided that the welding slag falls off and pierces the diaphragm under working conditions such as vibration, thereby avoiding internal short circuit of the battery cell, and maintaining the stable connection between the terminal post 2 and the bottom plate 3, improving the safety and stability of the battery.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating 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 implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A cover plate assembly, characterized in that: include: Cover plate body (1); A pole (2) and a bottom plate (3), wherein the pole (2) is arranged on the cover plate body (1), the pole (2) is connected to the bottom plate (3), the bottom plate (3) comprises a fuse section (31), and the pole (2) is arranged on one side of the fuse section (31); A protective member (4) is arranged at the connection between one end of the pole (2) facing the bottom plate (3) and the bottom plate (3).

2. The cover plate assembly according to claim 1, characterized in that: The pole (2) is welded to the bottom plate (3), and the protective member (4) is arranged to cover the welding area.

3. The cover plate assembly according to claim 1, characterized in that: The base plate (3) further comprises a first conductive segment (32) and a second conductive segment (33); along the length direction of the base plate (3), the first conductive segment (32), the fuse segment (31), and the second conductive segment (33) are arranged in sequence; and the pole (2) is arranged on the first conductive segment (32).

4. The cover plate assembly according to claim 3, characterized in that: The pole (2) is provided with a first slot (21), the first conductive segment (32) is provided with a second slot (321), and the first slot (21) and the second slot (321) cooperate to form a limiting slot for accommodating the protective element (4).

5. The cover plate assembly according to claim 4, characterized in that: The thickness of the bottom plate (3) is H1, and satisfies 1.00 mm ≤ H1 ≤ 3.00 mm; the depth of the limiting groove is H2, and satisfies 0.10 mm ≤ H2 ≤ 0.2H1.

6. The cover plate assembly according to claim 5, characterized in that: The thickness of the protective member (4) is H3, and satisfies H2≤H3≤H2+2.00mm.

7. The cover plate assembly according to claim 1, characterized in that: The protective member (4) is a protective patch, and the protective patch is fitted and connected to the pole (2) and the bottom plate (3).

8. The cover plate assembly according to claim 7, characterized in that: The end surface of the protective patch facing away from the cover plate body (1) is flush with the end surface of the base plate (3) facing away from the cover plate body (1), or the end surface of the protective patch facing away from the cover plate body (1) is protruding from the end surface of the base plate (3) facing away from the cover plate body (1).

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The thickness of the bottom plate (3) is greater than or equal to 1.00 mm.

10. A battery, characterized in that: It comprises a battery cell, a shell and a cover assembly as claimed in any one of claims 1 to 9, wherein the battery cell is arranged inside the shell, the shell is connected to the cover body (1), and the protective member (4) is arranged on a side of the cover body (1) facing the battery cell.

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