Battery cover plate

Abstract

The embodiment of the utility model discloses a battery cover plate which is used for connecting a tab aluminum shell sodium ion battery and comprises a plate body, a stop frame and an adapter piece, the plate body is provided with a fixing groove and a first positioning part, and the first positioning part is located in the fixing groove; the stop frame is arranged in the fixing groove, a second positioning part is arranged at the position, corresponding to the first positioning part, of the stop frame, the stop frame is connected with the plate body through matching of the first positioning part and the second positioning part, the switching piece is arranged in a groove of the stop frame and used for being connected with a tab of a battery, and the stop frame is arranged below the liquid injection opening and provided with the fixing groove. Liquid injection space is increased, and liquid injection efficiency is improved; the stop frame is provided with a fixing groove below the anti-explosion valve, so that the gas storage space is increased, and the safety performance is improved; the stop frame is provided with a fixing groove at the welding position of the adapter piece and the tab, so that the contact between the pole piece and the cover plate is avoided, and the stop frame descending process is omitted; and the fixing groove at the adapter plate of the stop frame completely wraps the tab according to the height and width, so that the tab is prevented from being in contact with the shell when being bent, and the safety performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum shell sodium ion battery cover plates, in particular to a battery cover plate. Background Art

[0002] Lithium-ion batteries are widely used in people's lives, but as limited lithium resources are gradually consumed and the price of lithium gradually increases, seeking alternatives to lithium-ion batteries has become an important research direction for power batteries or energy storage batteries. As an alkali metal element similar to lithium, sodium has the advantages of abundant resources, low price, and similar embedding mechanism. The research on room temperature sodium-ion batteries has attracted more and more attention. In recent years, substantial progress has been made in room temperature sodium-ion batteries.

[0003] Sodium-ion batteries have natural resource advantages, low cost, and no pollution to the environment. They are very suitable for large-scale energy storage and replacing lead-acid batteries. However, compared with lithium-ion batteries, sodium-ion batteries have a higher filling coefficient and require more filling space. At the same time, sodium-ion batteries produce more gas during formation, and a larger gas storage space is required at the explosion-proof valve. For aluminum-shell batteries, when the tabs are pre-welded and inserted into the shell, the tabs will bend. When the tabs are bent, there is a high probability that they will touch the large surface of the shell, resulting in a short circuit. Many short-circuit tests are scrapped, affecting the overall pass rate.

[0004] Therefore, how to improve the safety performance of batteries is an important technical issue that needs to be solved urgently. Utility Model Content

[0005] In order to overcome the above-mentioned technical problems, the utility model discloses a battery cover plate, in which a stop frame is provided below the liquid filling port and a fixed groove is designed to increase the liquid filling space and improve the liquid filling efficiency; a fixed groove is designed below the explosion-proof valve to increase the gas storage space and improve the safety performance; a fixed groove is designed at the welding place between the stop frame and the pole ear to prevent the pole piece from contacting the cover plate and omit the process of lowering the stop frame; the height and width of the fixed groove at the stop frame adapter completely wrap the pole ear, preventing the pole ear from contacting the shell when bending, thereby improving the safety performance.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0007] The present application provides a battery cover plate for connecting a tab aluminum shell sodium ion battery, which is characterized by comprising:

[0008] A plate body, wherein a fixing groove and a first positioning portion are formed on the plate body, and the first positioning portion is located in the fixing groove;

[0009] A stop frame is arranged in the fixing groove, a second positioning portion is arranged on the stop frame at a position corresponding to the first positioning portion, the stop frame is connected to the plate body through matching of the first positioning portion and the second positioning portion, and a groove is arranged on a side of the stop frame away from the plate body;

[0010] The adapter plate is arranged in the groove of the stop frame, and the adapter plate is used to connect the pole ear of the battery.

[0011] Optionally, in some embodiments of the present application, a liquid injection port is provided on the plate body, a cavity is provided on the stop frame at a position on one side corresponding to the liquid injection port, and a retaining bar is protruded in the cavity.

[0012] Optionally, in some embodiments of the present application, an explosion-proof valve is provided on the plate body, a cavity is provided on the stop frame at a position on one side corresponding to the explosion-proof valve, and a retaining bar is protruded from one side of the cavity.

[0013] Optionally, in some embodiments of the present application, the groove on the stop frame is configured as a rectangular groove, the groove height on the pole ear welding side is consistent with the height of the connecting plate, the groove height on the non-pole ear welding side does not exceed the overall height of the stop frame and is not lower than the groove height on the pole ear welding side.

[0014] Optionally, in some embodiments of the present application, the groove on the stop frame is configured as a rectangular groove, and the width of the groove is greater than the bending width of the battery tab and less than the width of the cover plate.

[0015] Optionally, in some embodiments of the present application, the width of the stop frame is smaller than the width of the cover plate and larger than the bending width of the tab.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The hollow design of the stop frame below the injection port provides more space for injection, and the injection efficiency is higher when designing high-capacity and high-injection-volume batteries;

[0018] 2. The hollow design of the stop frame under the explosion-proof valve is conducive to the accumulation of gas at the explosion-proof valve, so that the explosion-proof valve can play a more effective role and improve safety performance;

[0019] 3. Through the groove design at the stop frame adapter, the stop frame can meet the insulation between the pole ear and the cover plate, saving the process of installing the lower stop frame;

[0020] 4. The groove size design at the stop frame adapter can effectively prevent the tab from contacting the shell when bent, thereby improving safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the overall structure of the battery cover provided in an embodiment of the present application;

[0023] Figure 2 An exploded schematic diagram of the overall structure of a battery cover provided in an embodiment of the present application, with the cover located at the positive electrode;

[0024] Figure 3 An exploded schematic diagram of the overall structure of a battery cover provided in an embodiment of the present application, with the cover located at the negative electrode;

[0025] Figure 4 A schematic diagram of the structure of the battery cover and battery assembly provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 100, plate body; 110, fixing groove; 120, first positioning part; 130, liquid filling port; 140, explosion-proof valve; 200, stop frame; 210, second positioning part; 220, groove; 230, cavity; 231, baffle; 300, adapter; 400, battery; 410, pole ear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0029] Specifically, Figure 1 As shown, an embodiment of the present application provides a battery cover plate, which is used for connecting a 410 aluminum shell sodium ion battery with a tab, and the battery cover plate is mainly composed of a plate body 100, a stop frame 200 and an adapter plate 300.

[0030] Among them, a first positioning portion 120 is provided on the plate body 100, and correspondingly, a second positioning portion 210 is provided on the stop frame 200, and the second positioning portion 210 is arranged corresponding to the first positioning portion 120. In the embodiment of the present application, the first positioning portion 120 is a positioning pin, and the second positioning portion 210 is a positioning hole. The shape of the positioning hole corresponds to the shape of the positioning pin, so that when the stop frame 200 is assembled on the plate body 100, the positioning pin is located in the positioning hole, and the stop frame 200 can be assembled on the plate body 100 through the abutment relationship between the positioning pin and the positioning hole.

[0031] In the embodiment of the present application, the positioning pin may also be installed on the stop frame 200 , and the positioning hole may also be installed on the plate body 100 .

[0032] A fixing groove 110 is also provided on the plate body 100, and the shape of the fixing groove 110 is adapted to the shape of the stop frame 200 on the plate body 100, and an explosion-proof valve 140 or an injection port 130 is provided at the bottom position of the fixing groove 110, wherein when the battery cover is provided on the positive electrode of the battery 400, this position is the injection port 130, and the injection port 130 can inject electrolyte. In the embodiment of the present application, 300g of electrolyte is provided, and the electrolyte can be injected into the cavity 230 through the injection port 130 at one time to improve the conductive efficiency. The cavity 230 is opened at a side position corresponding to the injection port 130 on the stop frame 200, and a baffle 231 is provided at a side position of the cavity 230.

[0033] Among them, when the battery cover is located on the negative electrode of the battery 400, this position is the explosion-proof valve 140. The explosion-proof valve 140 is a pressure valve. When gas is generated inside the battery 400, when the gas pressure rises to a certain level, the explosion-proof valve 140 opens to discharge excess gas and improve the safety performance of the battery 400.

[0034] In which, in the embodiment of the present application, a groove 220 is also provided on the stop frame 200, and the groove 220 is located on the side of the stop frame 200 relative to the plate body 100. An adapter plate 300 is installed in the groove 220, and the shape of the adapter plate 300 corresponds to the shape of the groove 220. When the stop frame 200 is installed on the plate body 100, the adapter plate 300 is installed in the groove 220 on the stop frame 200.

[0035] The adapter sheet 300 is mainly used to connect the tab 410 of the battery 400 in the groove 220. The tab 410 and the connecting sheet are welded together after the battery cell stack or winding to form a battery pack.

[0036] In the embodiment of the present application, the tab 410 of the battery 400 is connected to the adapter 300 and the stop frame 200 by welding.

[0037] In the above process, when the pole ear 410 of the battery 400 is connected to the adapter plate 300, the pole ear 410 may be easily bent, causing the pole ear 410 to contact the shell, which may cause a short circuit. To avoid this situation, the groove 220 provided on the stop frame 200 is a rectangular groove 220, and the height of one side of the groove 220 is consistent with the height of the connecting plate. The consistent height enables the pole ear 410 of the battery 400 to be smoothly connected to the adapter plate 300, and avoids the connection between the bent pole ear 410 and the shell.

[0038] The height on the other side of the groove 220, that is, relative to the side position of the pole ear 410 of the battery 400, is higher than the height of the edge of the groove 220. In the present application, since the adapter 300 needs to be better connected to the pole ear 410 of the battery 400, the adapter 300 needs to be arranged parallel to the groove 220, so that an opening is opened on the adapter 300 at the position corresponding to the groove 220. The opening can wrap the bent pole ear 410 on the battery 400 to prevent the excessively long pole ear 410 from contacting the shell.

[0039] In the embodiment of the present application, the height of the groove 220 on the non-tab 410 welding side is not greater than the overall height of the stop frame 200 and is not less than the height of the groove 220 on the tab 410 welding side.

[0040] To facilitate wrapping of the tab 410 , the width of the groove 220 is greater than the bending width of the tab 410 of the battery 400 and less than the width of the cover plate. The width of the stop frame 200 is less than the width of the cover plate and greater than the bending width of the tab 410 .

[0041] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A battery cover for connecting a tab aluminum shell sodium ion battery, characterized in that: include: A plate body, wherein a fixing groove and a first positioning portion are formed on the plate body, and the first positioning portion is located in the fixing groove; A stop frame is arranged in the fixing groove, a second positioning portion is arranged on the stop frame at a position corresponding to the first positioning portion, the stop frame is connected to the plate body through matching of the first positioning portion and the second positioning portion, and a groove is arranged on a side of the stop frame away from the plate body; The adapter plate is arranged in the groove of the stop frame, and the adapter plate is used to connect the pole ear of the battery.

2. The battery cover according to claim 1, characterized in that: The plate body is provided with a liquid injection port, the stop frame is provided with a cavity at a position on one side corresponding to the liquid injection port, and a retaining bar is protruded in the cavity.

3. The battery cover according to claim 1, characterized in that: An explosion-proof valve is provided on the plate body, a cavity is provided on the stop frame at a position on one side corresponding to the explosion-proof valve, and a retaining bar is protruded on one side of the cavity.

4. The battery cover according to claim 1, characterized in that: The groove on the stop frame is set as a rectangular groove, the groove height on the side of the pole ear welding is consistent with the height of the connecting piece, the groove height on the side not of the pole ear welding does not exceed the overall height of the stop frame, and is not lower than the groove height on the side of the pole ear welding.

5. The battery cover according to claim 1, characterized in that: The groove on the stop frame is configured as a rectangular parallelepiped groove, and the width of the groove is greater than the bending width of the battery tab and less than the width of the cover plate.

6. The battery cover according to claim 1, characterized in that: The width of the stop frame is smaller than the width of the cover plate, and larger than the bending width of the tab.

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