Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cover plate and a battery. The battery cover plate comprises a cover plate main body and two pole parts arranged on the cover plate main body, the pole part comprises two pole pieces which are mutually spaced and mutually symmetrical; the pole pieces are arranged on the cover plate main body in a penetrating manner and are mutually insulated from the cover plate main body; one side of the cover plate main body is sunken to form an accommodating groove for accommodating a positive tab and a negative tab of a battery cell, a mounting notch is formed in the side wall of the accommodating groove, one end of the pole piece is arranged on one side, back to the accommodating groove, of the cover plate main body, and the other end of the pole piece is arranged in the accommodating groove and is exposed in the mounting notch; the two pole pieces of one pole part are both used for being connected with a positive lug, and the two pole pieces of the other pole part are both used for being connected with a negative lug. The two pole pieces in the pole part can improve the current passing efficiency, so that excessive heat generated by local concentration of the current is avoided, and the stable work of the battery is ensured; and the mounting gap expands the operation space on the cover plate main body, so that the operation convenience of wrapping the pole piece with the mylar film is improved.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of battery technology, the capacity, power and energy density of batteries are continuously improved, and higher requirements are put forward for the performance of batteries. During the working process of the battery, the cover plate of the battery is an important component of the battery system, and its structural design plays a crucial role in the current conduction, thermal management and long-term stability of the battery.

[0003] At present, a common battery includes a battery cover plate, a battery cell and a shell, the battery cell is installed in the shell, a pole is arranged on the battery cover plate, the pole is connected with the tab of the battery cell, so that the pole can lead out the electric energy in the battery cell; a side edge of the battery cover plate is provided with a side plate, the side plate can be inserted into the opening of the shell, so that the battery cover plate is covered on the shell, and the battery cover plate and the side plate form a groove structure, and the tab of the battery cell enters the groove structure to be connected with the pole.

[0004] However, the existing pole is difficult to bear high-power and high-energy-density electric energy, and problems such as uneven current conduction, excessive resistance and poor heat dissipation are prone to occur. The efficiency and service life of the battery are affected, and the battery may also overheat and expand, and even cause safety hazards. Moreover, when the battery is assembled, after the pole is connected with the tab, a microporous film needs to be wrapped around the connection between the pole and the tab to isolate the electrolyte and avoid internal short circuit of the battery. The battery cell is close to the notch of the groove structure on the battery cover plate, so that the operation space in the groove structure of the battery cover plate is limited, and it is difficult for the worker to wrap the microporous film around the connection between the pole and the tab in the groove structure, thereby affecting the convenience of battery assembly. Utility model content

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a battery cover plate and a battery.

[0006] The first aspect of the present application provides a battery cover plate, which comprises a cover plate body and two pole parts arranged on the cover plate body.

[0007] The pole part comprises two pole pieces which are spaced apart and symmetrical to each other, and the pole pieces are arranged on the cover plate body and are insulated from the cover plate body.

[0008] One side of the cover plate body is recessed to form a receiving groove for accommodating the positive tab and the negative tab of the battery cell, and a mounting gap is arranged on the side wall of the receiving groove. One end of the pole piece is located on the side of the cover plate body away from the receiving groove, and the other end of the pole piece is located in the receiving groove and exposed in the mounting gap.

[0009] Two of the pole column parts of one of the pole column parts are used for connecting with the positive pole lug, and two of the pole column parts of the other of the pole column parts are used for connecting with the negative pole lug.

[0010] Optionally, the installation gap is arranged on the side wall of one side of the accommodating groove along the width direction of the cover plate body.

[0011] Optionally, the number of the installation gap is two, and the two installation gaps are arranged on the two side walls opposite to each other along the width direction of the cover plate body.

[0012] Optionally, at least one movable side plate is detachably arranged on the cover plate body, and one movable side plate is arranged at each installation gap, so that the installation gap corresponds to cover the movable side plate.

[0013] Optionally, the pole column part further comprises a pole column cover plate.

[0014] The pole column cover plate is arranged on the side of the cover plate body away from the accommodating groove, and is insulatedly connected with the cover plate body, and the two pole column parts are electrically connected with the pole column cover plate.

[0015] Optionally, the pole column cover plate comprises an insulating plate and a conductive plate, one side of the insulating plate is connected with the conductive plate, and the other side of the insulating plate is connected with the cover plate body, and the pole column part is electrically connected with the conductive plate through the insulating plate.

[0016] Optionally, the pole column part comprises a main body part and a base part, the main body part is connected to one side of the base part, the base part is arranged in the accommodating groove, the main body part is exposed on the side of the cover plate body away from the cover plate body through the cover plate body, and the main body part and the base part are both insulated from the cover plate body.

[0017] The projection area of the main body part on the base part is smaller than the area of the base part, and the base part is used for connecting with the positive pole lug or the negative pole lug of the battery cell.

[0018] Optionally, the two pole column parts are arranged at intervals along the length direction of the cover plate body.

[0019] The two pole column parts in each of the pole column parts are arranged at intervals along the length direction of the cover plate body, and a plane perpendicular to the length direction of the cover plate body is used as a symmetry plane, and the two pole column parts in each of the pole column parts are mirror-symmetric about the symmetry plane.

[0020] Optionally, the cover plate body is provided with an explosion-proof valve.

[0021] And / or, the cover plate body is provided with a liquid injection hole in communication with the accommodating groove.

[0022] And / or, each of the pole column pieces is sleeved with a sealing ring, which is arranged between the pole column piece and the cover plate body, so that the pole column piece and the cover plate body are sealingly connected and insulated from each other.

[0023] The second aspect of the application provides a battery, comprising a battery cell, a battery shell and a battery cover plate as any one of the above.

[0024] The battery cell is provided with a positive electrode lug and a negative electrode lug, the battery cell is arranged in the battery shell, the cover plate body covers the battery shell, the positive electrode lug is connected with one of the pole column parts, and the negative electrode lug is connected with the other pole column part.

[0025] The technical solution provided by the application has the following advantages compared with the prior art:

[0026] The battery cover plate provided by the embodiment of the application comprises a cover plate body and two pole column parts arranged on the cover plate body; the pole column part comprises two pole column pieces spaced apart and symmetrical to each other, the pole column piece is arranged through the cover plate body and insulated from the cover plate body, the two pole column pieces can increase the contact area of the pole column part and the battery cell, and can form parallel conductive paths, so that the two pole column pieces can share the current output by the battery cell and balance the current distribution; one side of the cover plate body is recessed to form a receiving groove for accommodating the positive electrode lug and the negative electrode lug of the battery cell, the side wall of the receiving groove is provided with a mounting notch, one end of the pole column piece is located on the side of the cover plate body away from the receiving groove, and the other end is located in the receiving groove and exposed in the mounting notch, which facilitates the operation of wrapping the pole column piece with the Mylar film through the mounting notch; the two pole column pieces of one pole column part are used for connecting the positive electrode lug, and the two pole column pieces of the other pole column part are used for connecting the negative electrode lug. The two pole column pieces in the pole column part can improve the current passing efficiency and avoid local concentration of current to generate excessive heat, so as to ensure stable operation of the battery; the mounting notch expands the operation space on the cover plate body, so that the operator can conveniently complete the operation of wrapping the Mylar film around each pole column piece in the receiving groove, reduce the operation difficulty of assembling the battery, and improve the assembly efficiency of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor.

[0029] Figure 1 The structural schematic diagram of the battery cover plate is shown in the embodiment of the present application.

[0030] Figure 2 The exploded view of the battery cover plate is shown in the embodiment of the present application.

[0031] Figure 3 The sectional view of the battery cover plate is shown in the embodiment of the present application.

[0032] Figure 4 The partial enlarged view of the sectional view of the battery cover plate is shown in the embodiment of the present application.

[0033] Wherein, 1, cover plate body; 11, accommodating groove; 12, mounting notch; 13, panel part; 14, lower plastic; 2, pole column part; 21, pole column piece; 211, main body part; 212, base part; 22, pole column cover plate; 221, conductive plate; 222, insulating plate; 23, sealing ring; 3, movable side plate; 4, explosion-proof valve; 5, liquid injection hole. DETAILED DESCRIPTION

[0034] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present application, not all the embodiments.

[0036] Reference Figures 1 to 4 As shown in the figure, the first aspect of the embodiment of the present application provides a battery cover plate, which comprises a cover plate body 1, two pole column parts 2 arranged on the cover plate body 1; the pole column part 2 comprises two pole column pieces 21 which are spaced apart and symmetrical to each other, the pole column piece 21 is arranged on the cover plate body 1 and is insulated from the cover plate body 1; the side of the cover plate body 1 is recessed to form an accommodating groove 11 for accommodating the positive and negative tabs of the battery cell, the mounting notch 12 is arranged on the side wall of the accommodating groove 11, one end of the pole column piece 21 is arranged on the side of the cover plate body 1 away from the accommodating groove 11, and the other end is arranged in the accommodating groove 11 and exposed in the mounting notch 12; the two pole column pieces 21 of one pole column part 2 are used for connecting with the positive tab, and the two pole column pieces 21 of the other pole column part 2 are used for connecting with the negative tab.

[0037] Specifically, the battery cell has two tabs, one as the positive tab and the other as the negative tab. Two terminal posts 2 are connected to the positive and negative tabs respectively. After an external electrical device is connected to the two terminal posts 2, a circuit is formed between the battery cell and the external electrical device, allowing the electrical energy within the battery cell to be input into the external electrical device. The positive and negative tabs protrude from the surface of the battery cell and need to be inserted into the receiving groove 11 to connect with the terminal post 21 within the receiving groove 11.

[0038] The aforementioned cover plate body 1 is a plate structure. The cover plate body 1 has two sets of mounting holes, which are correspondingly arranged with two pole pieces 2. Each set of mounting holes includes two mounting holes that penetrate the cover plate body 1, with one end of the mounting hole communicating with the receiving groove 11 and the other end exposed on the side of the cover plate body 1 facing away from the receiving groove 11. The two pole pieces 21 in each pole piece 2 are respectively inserted into the two mounting holes of one set of mounting holes, thus allowing the pole pieces 21 to be inserted into the cover plate body 1. Optionally, insulating material can be filled between the pole pieces 21 and the inner wall of the mounting holes to insulate the pole pieces 21 from the cover plate body 1.

[0039] The cover plate body 1 described above may include a plate body and multiple side plates. Multiple side plates are provided on one side of the plate body. The multiple side plates are arranged around the center of the cover plate body 1. In the direction around the cover plate body 1, two adjacent side plates are connected to each other, so that the plate body and the multiple side plates form a receiving groove 11. One of the multiple side plates may be recessed towards the plate body, so that the recessed side plate and the adjacent side plate form an installation notch 12. Of course, two or other numbers of side plates may be recessed towards the plate body, and the recessed side plate and the adjacent side plate form multiple installation notches 12.

[0040] The four pole pieces 21 of the two pole pieces 2 described above are all exposed at one end in the mounting notch 12 within the receiving groove 11. When the pole piece 21 is connected to the positive or negative tab, the operator can insert the Mylar membrane into the receiving groove 11 through the mounting notch 12, place the Mylar membrane directly on one side of the pole piece 21 in the length or width direction of the cover body 1, and then bend the Mylar membrane to include the connection between the pole piece 21 and the positive or negative tab. If the mounting notch 12 is not provided, the operator can only insert the Mylar membrane into the receiving groove 11 through the opening of the receiving groove 11, and the operator can only wrap the Mylar membrane through the opening of the receiving groove 11. The protrusion distance of the positive and negative tabs on the battery cell is limited. After the positive and negative tabs are connected to the pole piece 21, the battery cell will be close to the opening of the receiving groove 11, making it difficult for the operator to wrap the Mylar membrane through the gap between the battery cell body and the opening of the receiving groove 11. Therefore, the installation notch 12 can serve as an operating window to allow the Mylar membrane to enter the receiving groove 11 and wrap around the electrode post 21. The installation notch 12 expands the operating space on the cover plate body 1, making it convenient for staff to use the Mylar membrane to wrap the electrode post 21 and the positive or negative electrode tab in the receiving groove 11.

[0041] The aforementioned terminal piece 21 can be made of metal, as can the positive and negative tabs. The terminal piece 21 is connected to the positive or negative tab by welding, thus electrically connecting the terminal piece 21 to the positive or negative tab. Alternatively, the positive and negative tabs can have mounting holes, and the terminal piece 21 can have adapter holes. The terminal piece 21 is then fitted to the positive or negative tab, electrically connecting it. Bolts are then passed through the mounting holes and adapter holes to connect the terminal piece 21 to the positive or negative tab.

[0042] Two terminal members 21 in one terminal section 2 are connected to the positive terminal of the battery cell, and two terminal members 21 in the other terminal section 2 are connected to the negative terminal of the battery cell. When the battery is in use, the charge flows from the positive terminal through the two terminal members 21 into the external electrical device, and then flows back to the battery cell from the negative terminal through the two terminal members 21, so as to complete the power supply operation to the external electrical device.

[0043] Two electrode members 21 in a electrode section 2 are spaced apart and symmetrical to each other. Alternatively, the two electrode members 21 can be spaced apart along the length of the cover plate body 1, and mirror-symmetrical about a plane perpendicular to the length of the cover plate body 1; or they can be spaced apart along the width of the cover plate body 1, and mirror-symmetrical about a plane perpendicular to the length of the cover plate body 1. That is, if the two electrode members 21 have the same shape and volume, and are made of the same material, their resistance is the same. This ensures that when the charge flows through the two electrode members 21, the charge flowing through them is approximately equal, allowing the current between the battery cell and the external electrical equipment to be evenly distributed across the two electrode members 21 in the electrode section 2.

[0044] Compared to traditional battery covers that use a single terminal to connect to either the positive or negative tab, the two terminal members 21 in a single terminal section 2 increase the contact surface with the positive or negative tab and can form parallel conductive paths. This allows the two terminal members 21 to share the current, improving current carrying efficiency. Especially under high power load conditions, the battery can maintain higher output power without overheating.

[0045] Furthermore, the two terminal posts 21 are symmetrical, which balances the current distribution, reducing heat generated by excessive local current inside the battery and ensuring stable battery operation. This ensures balanced current flow within the battery cover, avoiding the risk of stress concentration and localized overheating caused by uneven current flow in traditional designs. Under high power loads, the current flows evenly and stably through the two terminal posts 21 in the terminal section 2, allowing the battery to maintain a stable operating state and preventing performance degradation or safety hazards due to uneven current conduction. In the event of overcharging, over-discharging, or other extreme conditions, the design of the two terminal posts 21 in the terminal section 2 effectively balances the current flow, preventing excessive or insufficient current from causing localized overheating, deformation, or short circuits in the battery area. Through reasonable current distribution, the risk of heat generation due to excessive internal battery temperature or current concentration is reduced, improving the battery's thermal stability.

[0046] In practical use, the battery cover provided in this application is first inserted into the receiving groove 11 at the end of the battery cell with the tabs. Both pole pieces 21 of one pole piece 2 are used to connect to the positive tab, and both pole pieces 21 of the other pole piece 2 are used to connect to the negative tab. Then, the Mylar membrane is inserted into the receiving groove 11 through the mounting notch 12. With the cooperation of the operator's hands, the Mylar membrane in the receiving groove 11 is bent to include each pole piece 21, and the Mylar membrane covers the connection between the pole piece 21 and the positive or negative tab.

[0047] After the Mylar membrane is wrapped, the battery cell and battery cover are installed in the battery casing. The two terminal posts 2 are exposed on the surface of the battery casing. The positive terminal of the external electrical device is connected to the two terminal posts 21 corresponding to the positive terminal tab, and the negative terminal of the external electrical device is connected to the two terminal posts 21 corresponding to the negative terminal tab. This allows the current in the battery cell to flow into the external electrical device through the two terminal posts 21 of one terminal post 2, and then flow back to the battery cell through the two terminal posts 21 of the other terminal post 2, so that the battery cell and the external electrical device form a circuit, and the battery cell supplies power to the external electrical device.

[0048] The battery cover provided in this application embodiment includes a cover body 1 and two terminal portions 2 disposed on the cover body 1. Each terminal portion 2 includes two mutually spaced and symmetrical terminal members 21. The terminal members 21 pass through the cover body 1 and are insulated from it. The two terminal members 21 increase the contact area between the terminal portion 2 and the battery cell, and form parallel conductive paths, allowing the two terminal members 21 to share the current output by the battery cell and balance the current distribution. One side of the cover body 1 is recessed to form a feature for... The battery cell has a receiving groove 11 for accommodating the positive and negative tabs. A mounting notch 12 is provided on the side wall of the receiving groove 11. One end of the electrode post 21 is on the side of the cover body 1 facing away from the receiving groove 11, while the other end is inside the receiving groove 11 and exposed in the mounting notch 12. This facilitates the Mylar membrane entering the receiving groove 11 through the mounting notch 12 to wrap the electrode post 21. Both electrode posts 21 in one electrode post 2 are used to connect to the positive tab, and both electrode posts 21 in the other electrode post 2 are used to connect to the negative tab. The two electrode posts 21 in the electrode post 2 improve current flow efficiency and avoid excessive heat generation due to localized current concentration, ensuring stable battery operation. The mounting notch 12 expands the operating space on the cover body 1, allowing operators to easily wrap each electrode post 21 with the Mylar membrane within the receiving groove 11, reducing the difficulty of battery assembly and improving assembly efficiency.

[0049] Reference Figure 1 and Figure 2 As shown, in some embodiments, the mounting notch 12 is formed on the side wall of the receiving groove 11 along the width direction of the cover plate body 1. With this configuration, the area of ​​the side wall along the width direction of the cover plate body 1 is relatively large, allowing the mounting notch 12 to have a larger area, which facilitates the operator to wrap each pole piece 21 through the mounting notch 12.

[0050] Specifically, the cover plate body 1 can be a rectangular plate structure. The bottom of the receiving groove 11 formed on the cover plate body 1 is rectangular. The receiving groove 11 has four side walls. The area of ​​the side wall along the width direction of the cover plate body 1 is larger than the area of ​​the side wall along the length direction of the cover plate body. The installation notch 12 is set on the side wall of the receiving groove 11 along the width direction of the cover plate body 1. This allows the installation notch 12 to have a large area, making it convenient for workers to pass the Mylar membrane through the installation notch 12 and then wrap each pole piece 21 in the receiving groove 11.

[0051] Reference Figure 1 and Figure 2 As shown, in some embodiments, there are two mounting notches 12, which are respectively provided on two opposite side walls of the receiving groove 11 along the width direction of the cover plate body 1. With this arrangement, the operator can bend and move the Mylar membrane in the receiving groove 11 through the two mounting notches 12, making it convenient for the operator to wrap the Mylar membrane around each pole piece 21.

[0052] Specifically, the receiving groove 11 has two installation notches 12 on the two opposite side walls of the cover plate body 1 in the width direction, so that the staff can bend and move the Mylar membrane in the receiving groove 11 through the two installation notches 12, so that the Mylar membrane in the receiving groove 11 can surround the pole piece 21.

[0053] Reference Figure 1 and Figure 2 As shown, in some embodiments, at least one movable side plate 3 is detachably mounted on the cover body 1, with one movable side plate 3 corresponding to each mounting notch 12, so that the mounting notch 12 covers the movable side plate 3. This arrangement allows the movable side plate 3 to cover the mounting notch 12, enabling it to also abut against the opening of the battery casing, improving the stability of the cover body 1 on the battery casing. Furthermore, the movable side plate 3 protects the Mylar membrane within the receiving groove 11, preventing damage to the Mylar membrane from impact during the installation of the battery cover and battery cell into the battery casing.

[0054] Specifically, since the area of ​​the movable side plate 3 is larger than the mounting notch 12, a buckle can be installed on the outer surface of the cover plate body 1, and the movable side plate 3 can be snapped into the buckle, thus covering the mounting notch 12. Alternatively, a buckle can be installed on the side wall of the receiving groove 11 at the edge of the mounting notch 12, and the movable side plate 3 can be snapped into the side wall of the receiving groove 11 around the mounting notch 12, so that the movable side plate 3 covers the mounting notch 12.

[0055] When there is one mounting notch 12, there is one movable side plate 3, and one movable side plate 3 is installed at the mounting notch 12; when there are two mounting notches 12, there are two movable side plates 3, and two movable side plates 3 are installed at the two mounting notches 12 respectively.

[0056] Reference Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the pole post 2 further includes a pole post cover plate 22;

[0057] The pole cover plate 22 is disposed on the side of the cover plate body 1 facing away from the receiving groove 11 and is insulated from the cover plate body 1. The two pole pieces 21 are electrically connected to the pole cover plate 22.

[0058] With this configuration, the pole cover plate 22 is electrically connected to the two pole pieces 21, and the external electrical equipment is electrically connected to the pole cover plate 22, so that the current on the two pole pieces 21 can be input into the external electrical equipment, which facilitates the operation of electrically connecting the external electrical equipment to the two pole pieces 21 in the pole part 2.

[0059] Specifically, the pole cover plate 22 can be a plate structure with two clearance holes. Two pole pieces 21 are respectively inserted into the two clearance holes, and the pole pieces 21 are connected to the inner walls of the clearance holes, so that the pole cover plate 22 and the pole pieces 21 are electrically connected. External electrical equipment is electrically connected to the pole cover plate 22, thus enabling electrical connection between the external electrical equipment and the two pole pieces 21 of the pole section 2. Alternatively, the pole cover plate 22 can be fitted to the end of the two pole pieces 21 furthest from the receiving groove 11.

[0060] The aforementioned pole cover plate 22 may be provided with an insulating material pad between it and the cover plate body 1, so that the pole cover plate 22 and the cover plate body 1 are mutually insulated. Alternatively, the pole cover plate 22 and the cover plate body 1 may be spaced apart, so that the pole cover plate 22 and the cover plate body 1 are mutually insulated.

[0061] Reference Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the pole cover plate 22 includes an insulating plate 222 and a conductive plate 221. One side of the insulating plate 222 is connected to the conductive plate 221, and the other side is connected to the cover plate body 1. The pole member 21 passes through the insulating plate 222 and is electrically connected to the conductive plate 221.

[0062] With this configuration, the conductive plate 221 and the insulating plate 222 cooperate with each other, so that the conductive plate 221 can be electrically connected to the two pole pieces 21, and the conductive plate 221 is insulated from the cover plate body 1 through the insulating plate 222. The separate configuration of the insulating plate 222 and the conductive plate 221 can reduce the manufacturing difficulty of the pole cover plate 22, and when the pole cover plate 22 is in use, the conductive plate 221 or the insulating plate 222 can be replaced separately, which facilitates the maintenance of the pole cover plate 22.

[0063] Specifically, the conductive plate 221 can be a metal plate, and the insulating plate 222 can be a rubber plate or a plastic plate. The insulating plate 222 separates the conductive plate 221 from the cover plate body 1, thereby insulating the conductive plate 221 from the cover plate body 1. After the two pole pieces 21 are connected to the conductive plate 221, the external electrical equipment can be electrically connected to the conductive plate 221, thus enabling the external electrical equipment to be electrically connected to the two pole pieces 21.

[0064] The conductive plate 221 has two first mounting holes, and the insulating plate 222 has two second mounting holes. The two first mounting holes and two second mounting holes are arranged in a one-to-one correspondence and are coaxial. The electrode post 21 passes through the second mounting hole and the first mounting hole sequentially, and the electrode post 21 is in contact with the inner wall of the first mounting hole, thereby allowing the electrode post 21 to pass through the insulating plate 222 and be electrically connected to the conductive plate 221. The two electrode posts 21 respectively pass through the two second mounting holes and the two first mounting holes, so that the two electrode posts 21 pass through the insulating plate 222 and are electrically connected to the conductive plate 221.

[0065] Alternatively, two through holes can be provided on the insulating plate 222, and the two pole pieces 21 can pass through the two through holes on the insulating plate 222 respectively, so that the pole pieces 21 are exposed on the side of the insulating plate 222 facing away from the cover plate body 1. The conductive plate 221 and the pole pieces 21 are attached and connected to each other on the part of the insulating plate 222 facing away from the cover plate body 1, so that the conductive plate 221 and the pole pieces 21 are electrically connected.

[0066] Reference Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the electrode post 21 includes a main body 211 and a base 212. The main body 211 is connected to one side of the base 212, and the base 212 is disposed in the receiving groove 11. The main body 211 passes through the cover plate body 1 and is exposed on the side of the cover plate body 1 facing away from the cover plate body 1. Both the main body 211 and the base 212 are insulated from the cover plate body 1. The area of ​​the projection of the main body 211 onto the base 212 is smaller than the area of ​​the base 212. The base 212 is used to connect to the positive or negative electrode tab of the battery cell.

[0067] With this configuration, the base portion 212 has a larger area, which increases the contact area between the terminal piece 21 and the positive or negative tab of the battery cell, avoids excessive local current at the connection point between the terminal piece 21 and the positive or negative tab, and facilitates the connection operation after the base portion 212 is attached to the positive or negative tab.

[0068] Specifically, the main body 211 can be a column structure, and the base 212 can be a plate structure. The main body 211 is connected to the base 212 and is perpendicular to the base 212. The main body 211 passes through the mounting hole on the cover plate body 1 and the base 212 is in the receiving groove 11. The base 212 and the bottom of the receiving groove 11 can be spaced apart from each other. Alternatively, an insulating gasket can be provided between the base 212 and the bottom of the receiving groove 11, as long as the base 212 and the cover plate body 1 are insulated from each other.

[0069] The base portion 212 described above can extend along the length direction of the cover plate body 1, or it can extend along the width direction of the cover plate body 1. When the two pole pieces 21 are spaced apart and symmetrical to each other along the length direction of the cover plate body 1, the base portions 212 of the two pole pieces 21 extend in a direction away from each other along the length direction of the cover plate body 1, and the two base portions 212 are mirror symmetrical.

[0070] The base portion 212 is used in the receiving groove 11 to connect with the positive or negative tab of the battery cell. The projection of the main body portion 211 along its own axis onto the base portion 212 is inside the base portion 212, and the area of ​​the projection is smaller than the area of ​​the base portion 212.

[0071] The main body 211 and base 212 of the electrode post 21 connected to the positive electrode can be integrally formed of aluminum metal, while the main body 211 of the electrode post 21 connected to the negative electrode can be made of aluminum metal and the base 212 of copper metal. The base 212 and the main body 211 are then bonded together and connected to each other by welding.

[0072] Reference Figures 1 to 4 As shown, in some embodiments, the two pole posts 2 are spaced apart along the length of the cover plate body 1;

[0073] The two pole members 21 in each pole member 2 are spaced apart along the length direction of the cover plate body 1, with the plane perpendicular to the length direction of the cover plate body 1 as the plane of symmetry, and the two pole members 21 in each pole member 2 are mirror symmetrical about the plane of symmetry.

[0074] This configuration allows the two pole sections 2 and the two pole pieces 21 within the pole section 2 to fully utilize the space of the cover plate body 1, ensuring that the size of the pole piece 21 meets the requirements for transmitting current.

[0075] Specifically, the length dimension of the cover plate body 1 is greater than the width dimension of the cover plate body 1. The two pole posts 2 are spaced apart along the length direction of the cover plate body 1, and the two pole posts 21 are spaced apart along the length direction of the cover plate body 1, so that the two pole posts 2 can make full use of the space of the cover plate body 1 in the length direction and avoid the two pole posts 2 being too close together; the two pole posts 21 can also make full use of the space of the cover plate body 1 in the length direction and avoid the space of the cover plate body 1 restricting the size of the pole posts 21.

[0076] With the plane perpendicular to the length direction of the cover plate body 1 as the plane of symmetry, the two pole pieces 21 are mirror symmetrical about the plane of symmetry, that is, the shape and size of the two pole pieces 21 are the same, and the resistance of the two pole pieces 21 is the same, so that the current on the positive or negative electrode can be evenly distributed on the two pole pieces 21.

[0077] Reference Figure 1 and Figure 2 As shown, in some embodiments, the cover body 1 is provided with an explosion-proof valve 4. With this configuration, the explosion-proof valve 4 can open when the battery cell generates a large amount of gas, thereby discharging the gas generated by the battery cell through the explosion-proof valve 4 and preventing the large amount of gas generated by the battery cell from accumulating inside the battery and causing the battery to explode.

[0078] Specifically, the explosion-proof valve 4 can include a movable cover and a connecting hole. The connecting hole penetrates the cover body 1, connecting the connecting hole to the receiving groove 11. When the explosion-proof valve 4 is closed, the movable cover covers the connecting hole. When the battery cell heats up and generates a large amount of gas, the movable cover opens, connecting the receiving groove 11 to the external environment. The gas generated by the battery cell can be discharged from the battery through the connecting hole. The explosion-proof valve 4 can be positioned between the two terminal posts 2, so that the position of the explosion-proof valve 4 corresponds to the middle of the battery cell, improving the venting effect when the explosion-proof valve 4 is open.

[0079] Reference Figure 1 and Figure 2 As shown, in some embodiments, the cover plate body 1 is provided with an injection hole 5 that communicates with the receiving groove 11. With this configuration, the operator can inject electrolyte into the battery casing through the injection hole 5.

[0080] Specifically, the cover plate body 1 can be provided with a through hole as an injection hole 5. When the cover plate body 1 is closed on the battery casing, the injection hole 5 is connected to the space inside the battery casing, and the staff can inject the electrolyte into the battery casing through the injection hole 5.

[0081] In some embodiments, the cover plate body 1 is integrally formed, and the cover plate body 1 forms a connecting hole, a mounting hole and a liquid injection hole during the forming process.

[0082] Reference Figure 1 and Figure 2As shown, in some embodiments, a sealing ring 23 is fitted onto each pole piece 21. The sealing ring 23 is disposed between the pole piece 21 and the cover plate body 1, so that the pole piece 21 and the cover plate body 1 are sealed and insulated from each other. With this configuration, the sealing ring 23 has a simple structure and is made integral. After being fitted onto the pole piece 21, the pole piece 21 and the sealing ring 23 are together inserted into the cover plate body 1, so that the pole piece 21 and the cover plate body 1 are sealed and insulated from each other, simplifying the operation of installing the pole piece 21 on the cover plate body 1.

[0083] Specifically, the sealing ring 23 can be a rubber ring or a plastic ring. The sealing ring 23 is fitted onto the pole piece 21, so that the sealing ring 23 and the pole piece 21 pass through the mounting hole of the cover plate body 1. One side of the sealing ring 23 abuts against the inner wall of the mounting hole, and the other side abuts against the surface of the pole piece 21, thereby sealing the mounting hole. The sealing ring 23 is an insulating material, and the sealing ring 23 separates the pole piece 21 and the cover plate body 1 so that the pole piece 21 and the cover plate body 1 are mutually insulated.

[0084] When the pole piece 21 includes a main body 211 and a base 212, the sealing ring 23 is sleeved on the main body 211 and extends to the base 212. When the main body 211 is inserted into the mounting hole, the sealing ring 23 is disposed between the main body 211 and the inner wall of the mounting hole, and extends to the base 212 and the bottom of the receiving groove 11, thereby separating the main body 211 from the cover plate body 1 and separating the base 212 from the cover plate body 1, thus achieving mutual insulation between the pole piece 21 and the cover plate body 1.

[0085] Reference Figure 1 and Figure 2 As shown, in some embodiments, the cover body 1 includes a panel portion 13 and a lower plastic portion 14. The panel portion 13 is connected to one side of the lower plastic portion 14. A receiving groove 11 is formed on the side of the lower plastic portion 14 facing away from the panel portion 13. A main body portion 211 passes through the panel portion 13 and the lower plastic portion 14. The main body portion 211 is insulated from the panel portion 13. A base portion 212 is attached to the side of the lower plastic portion 14 facing away from the panel portion 13, so that the base portion 212 is insulated from the panel portion 13. With this configuration, the lower plastic portion 14 operates insulated, the base portion 212 is insulated from the panel portion 13, and the panel portion 13, as a rigid plate, protects the lower plastic portion 14.

[0086] Specifically, the panel 13 is a plate structure, the lower plastic 14 is a block structure made of plastic material, the base 212 is in the receiving groove 11 on the lower plastic 14, and the base 212 is attached to the lower plastic 14, with the lower plastic 14 insulating the base 212 from the panel 13. A sealing ring 23 may be optionally fitted onto the main body 211. A through hole is provided on the panel 13, and the main body 211 passes through the through hole. The sealing ring 23 is disposed between the inner wall of the through hole and the main body 211, thus insulating the main body 211 from the panel 13. The lower plastic part 14 can be provided with a mounting through hole, which is coaxial with the through hole on the panel part 13, so that the main body part 211 can pass through the mounting through hole and the through hole; the size of the mounting through hole can be larger than the through hole on the panel part 13, so that the sealing ring 23 extends into the receiving groove 11 and is located in the mounting through hole, and the part of the sealing ring 23 in the receiving groove 11 is located between the base part 212 and the panel part 13.

[0087] A second aspect of this application provides a battery, including a battery cell, a battery casing, and a battery cover as described in any of the preceding claims;

[0088] The battery cell has a positive tab and a negative tab. The battery cell is placed inside the battery casing. The main body of the cover plate is placed on the battery casing. The positive tab is connected to one terminal part 2, and the negative tab is connected to the other terminal part 2.

[0089] Specifically, the battery casing is hollow inside, with an opening on one side. The battery cell is housed inside the casing, and a cover plate 1 closes to the opening. Both the positive and negative tabs of the battery cell are inserted into the receiving groove 11. The positive tab connects to two terminal members 21 in one terminal section 2, and the negative tab connects to two terminal members 21 in the other terminal section 2. An external power supply is electrically connected to the two terminal members 21, allowing the external device to connect to the battery cell and form a closed circuit, enabling the battery cell to supply power to the external device.

[0090] By using the battery cover plate described above in the battery, the two terminal members 21 in the terminal part 2 can balance the current and avoid local current concentration that could cause the battery to overheat. When assembling the battery, after the positive and negative tabs are connected to the two terminal parts 2 respectively, the operator can wrap the Mylar membrane around the four terminal members 21 through the installation notch 12, so that the Mylar membrane can be easily wrapped around the connection between the terminal member 21 and the positive or negative tab.

[0091] In the specific use of the battery cover and battery provided in this application embodiment, the sealing ring 23 is sleeved on the main body 211 of the terminal post 21. The main body 211 passes through the lower plastic 14 and the panel 13. The portion of the main body 211 exposed on the back of the panel 13 and facing the lower plastic 14 passes through the insulating plate 222 and connects to the conductive plate 221. The base 212 is attached to the lower plastic 14 in the receiving groove 11.

[0092] The positive tab of the battery cell is welded to the two base portions 212 of one terminal 2, and the negative tab of the battery cell is welded to the two base portions 212 of one terminal 2. The operator inserts the Mylar membrane into the receiving groove 11 through the installation notch 12, and controls the bending and deformation of the Mylar membrane through the installation notch 12 to wrap the Mylar membrane at the connection between the terminal 21 and the positive or negative tab. After the Mylar membrane is wrapped on all four terminal 21, the battery cell is inserted into the battery housing through the opening of the battery housing. The cover plate body 1 is closed on the opening of the battery housing, and the electrolyte is injected into the battery housing through the injection hole to complete the battery encapsulation.

[0093] The external electrical equipment is electrically connected to the two conductive plates 221 on the cover body 1. The battery cell and the external electrical equipment form a closed circuit. The current flows evenly from the battery cell through the two pole pieces 21 of one pole piece 2 into the external electrical equipment. Then the current flows back to the battery cell through the two pole pieces 21 of the other pole piece 2, so that the current forms a closed circuit between the battery cell and the external electrical equipment, and the battery cell supplies power to the external electrical equipment.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0095] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, characterized in that, It includes a cover plate body (1) and two pole posts (2) disposed on the cover plate body (1); The pole section (2) includes two pole members (21) that are spaced apart from each other and symmetrical to each other. The pole members (21) are inserted through the cover plate body (1) and are insulated from the cover plate body (1). The cover plate body (1) has a recessed groove (11) for accommodating the positive and negative tabs of the battery cell. The side wall of the groove (11) is provided with an installation notch (12). One end of the pole piece (21) is on the side of the cover plate body (1) facing away from the groove (11), and the other end is in the groove (11) and exposed in the installation notch (12). Both pole pieces (21) of one pole piece (2) are used to connect to the positive electrode tab, and both pole pieces (21) of the other pole piece (2) are used to connect to the negative electrode tab.

2. The battery cover according to claim 1, characterized in that, The mounting notch (12) is formed on the side wall of the receiving groove (11) along the width direction of the cover plate body (1).

3. The battery cover according to claim 1, characterized in that, The number of the installation notches (12) is two, and the two installation notches (12) are respectively provided on the two opposite side walls of the receiving groove (11) along the width direction of the cover plate body (1).

4. The battery cover according to claim 1, characterized in that, At least one movable side plate (3) is detachably installed on the cover plate body (1), and one movable side plate (3) is installed at each of the mounting notches (12) so that the mounting notches (12) cover the movable side plate (3).

5. The battery cover according to claim 1, characterized in that, The pole post (2) also includes a pole post cover plate (22); The pole cover plate (22) is disposed on the side of the cover plate body (1) facing away from the receiving groove (11) and is insulated from the cover plate body (1). The two pole pieces (21) are electrically connected to the pole cover plate (22).

6. The battery cover according to claim 5, characterized in that, The pole cover plate (22) includes an insulating plate (222) and a conductive plate (221). One side of the insulating plate (222) is connected to the conductive plate (221), and the other side is connected to the cover plate body (1). The pole piece (21) passes through the insulating plate (222) and is electrically connected to the conductive plate (221).

7. The battery cover according to claim 1, characterized in that, The pole piece (21) includes a main body (211) and a base (212). The main body (211) is connected to one side of the base (212). The base (212) is disposed in the receiving groove (11). The main body (211) passes through the cover plate body (1) and is exposed on the side of the cover plate body (1) facing away from the cover plate body (1). The main body (211) and the base (212) are both insulated from the cover plate body (1). The area of ​​the projection of the main body (211) onto the base (212) is smaller than the area of ​​the base (212), and the base (212) is used to connect to the positive or negative tab of the battery cell.

8. The battery cover according to claim 1, characterized in that, The two pole sections (2) are spaced apart along the length of the cover plate body (1); The two pole members (21) in each pole member (2) are spaced apart along the length direction of the cover body (1), with the plane perpendicular to the length direction of the cover body (1) as the plane of symmetry, and the two pole members (21) in each pole member (2) are mirror symmetrical about the plane of symmetry.

9. The battery cover according to claim 1, characterized in that, An explosion-proof valve (4) is provided on the main body (1) of the cover plate; And / or, the cover plate body (1) is provided with a liquid injection hole (5) communicating with the receiving groove (11); And / or, each of the pole pieces (21) is fitted with a sealing ring (23), the sealing ring (23) being disposed between the pole piece (21) and the cover plate body (1) so that the pole piece (21) and the cover plate body (1) are sealed and insulated from each other.

10. A battery, characterized in that, Includes battery cells and battery casing, as described in any one of claims 1 to 9; The battery cell is provided with a positive electrode and a negative electrode. The battery cell is disposed inside the battery housing. The cover plate body (1) covers the battery housing. The positive electrode is connected to one of the electrode posts (2), and the negative electrode is connected to the other electrode post (2).

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