Cover plate for battery, battery, battery pack, and electric device

Abstract

Provided are a cover plate for a battery, the battery, a battery pack, and an electric device. The cover plate for the battery comprises a main body part, and a connecting part configured to be connected to a pole assembly, wherein the thickness of the connecting part is greater than that of the main body part, and the thickness of the main body part is 0.1-0.3 mm.

Description

Used for battery covers, batteries, battery packs, and electrical devices.

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420899689.5, filed on April 26, 2024, entitled “Cover plate for battery, battery, battery pack and electrical device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of batteries, specifically to a cover plate for a battery, a battery, a battery pack, and an electrical device. Background Technology

[0004] A battery is a device that converts chemical energy into electrical energy. It typically includes electrodes, a battery pack bottom shell to support the electrodes, and a cover plate. The cover plate is placed on the battery pack bottom shell, and for convenient circuit connections, it usually also has terminal post assemblies. Meanwhile, the chemical substances inside the battery, such as the electrolyte, produce gas during battery use, causing the battery to expand. In related technologies, to reduce battery size and weight and increase energy density, the cover plate is usually thin. When the battery expands due to gas, the edges of the cover plate and terminal post assemblies experience stress concentration due to mutual compression, causing cracks in the cover plate and leading to battery leakage. Summary of the Invention

[0005] The purpose of this disclosure is to provide a cover plate for a battery, a battery, a battery pack, and an electrical device to solve the problem in the related art where stress concentration at the edge of the contact surface between the terminal assembly and the cover plate leads to cracks in the cover plate.

[0006] The first objective of this disclosure is to provide a cover for a battery, comprising a main body and a connecting portion for connecting an electrode assembly, wherein the thickness of the connecting portion is greater than the thickness of the main body, wherein the thickness of the main body is 0.1 mm to 0.3 mm.

[0007] Optionally, the ratio of the thickness of the connecting portion to the thickness of the main body portion is 2-10.

[0008] Optionally, the thickness of the connecting part is 0.8mm-2mm.

[0009] Optionally, the main body and the connecting part are integrally formed.

[0010] Optionally, the connecting portion is located at the end of the main body portion.

[0011] Optionally, the connecting portion includes a first connecting portion for connecting to the positive electrode assembly and a second connecting portion for connecting to the negative electrode assembly, wherein the first connecting portion and the second connecting portion are respectively disposed at both ends of the main body portion.

[0012] A second object of this disclosure is to provide a battery comprising an electrode core, an electrode post assembly connected to the electrode core, a bottom shell housing the electrode core, and a cover plate for the battery as described in any one of the foregoing, the cover plate being fitted onto the bottom shell.

[0013] Optionally, the projected area of ​​the connecting part on the surface of the cover plate is greater than the projected area of ​​the pole assembly on the surface of the cover plate.

[0014] Optionally, the ratio of the projected area of ​​the connecting part on the surface of the cover plate to the projected area of ​​the pole assembly on the surface of the cover plate is 1.1-2.

[0015] Optionally, the pole assembly includes:

[0016] The pole body extends through the connecting portion;

[0017] A flow guide block is connected to the portion of the pole body located outside the connecting part, and is used to connect to the busbar;

[0018] A first insulating block is disposed between the flow guide block and the connecting portion to electrically isolate the flow guide block from the cover plate.

[0019] Optionally, the end of the pole body near the pole core has a radially outwardly extending convex edge to abut against the cover plate from the inside, and the flow guide block is fixedly connected to the other end of the pole body, the flow guide block being used to abut the first insulating block against the cover plate.

[0020] Optionally, a sealing gasket is provided between the protruding edge and the cover plate, and the protruding edge abuts against the cover plate through the sealing gasket.

[0021] Optionally, the guide block has a through first mounting hole, which is a stepped hole with a large diameter section and a small diameter section. The small diameter section is connected to the pole body, and the large diameter section is located at the end of the guide block away from the pole core. There is a stepped surface between the large diameter section and the small diameter section, and the end face of the pole body is flush with the stepped surface.

[0022] Optionally, the battery further includes an adapter, wherein the end of the electrode core is formed with a tab, the adapter is connected to the tab and the electrode post body respectively, and the electrode post body is electrically connected to the electrode core through the adapter.

[0023] Optionally, the adapter includes:

[0024] The first plate is connected to the pole body;

[0025] A second plate is disposed opposite to the first plate, and the second plate contacts the tab surface. An operating space is formed between the first plate and the second plate.

[0026] The third plate is connected to the first plate and the second plate respectively.

[0027] Optionally, a second mounting hole is provided on the first plate, and the wall of the second mounting hole is connected to the outer periphery of the pole body.

[0028] Optionally, the battery further includes a second insulating block, which is respectively disposed on the surface of the adapter facing the cover plate and the surface facing the electrode core.

[0029] Optionally, the battery further includes a third insulating block disposed on the bottom shell, the third insulating block including a receiving space with an opening, the receiving space accommodating the tab and the first plate.

[0030] Optionally, the length of the battery is 300mm-800mm.

[0031] Optionally, the width of the battery is 50mm-200mm.

[0032] Optionally, the thickness of the battery is 10mm-30mm.

[0033] A third object of this disclosure is to provide a battery pack comprising a plurality of batteries arranged in parallel, wherein the batteries are any of the batteries described above.

[0034] A fourth object of this disclosure is to provide an electrical device including the aforementioned battery pack.

[0035] Through the above technical solution, the main body of the cover plate, with a thickness of only 0.1mm-0.3mm, is prone to deformation. Therefore, a connecting portion with a thickness greater than the main body is also required on the cover plate. The connecting portion is used to connect with the terminal assembly. When the terminal assembly is connected to the connecting portion, because the thickness of the connecting portion is greater than that of the main body, the connecting portion has higher strength than the main body. Therefore, when the battery expands due to gas, even if stress concentration occurs due to mutual compression between the edges of the connecting portion and the terminal assembly, the higher strength of the connecting portion prevents cracks that could lead to battery leakage. This ensures the service life and strength of the cover plate. Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 is a schematic diagram of the structure of the cover plate provided in an exemplary embodiment of this disclosure;

[0038] Figure 2 is a schematic diagram of the structure of a battery provided in an exemplary embodiment of this disclosure;

[0039] Figure 3 is an enlarged view of part A in Figure 2;

[0040] Figure 4 is a schematic diagram of the use of the cover plate and pole assembly provided in an exemplary embodiment of this disclosure;

[0041] Figure 5 is a cross-sectional view of a battery provided in an exemplary embodiment of this disclosure;

[0042] Figure 6 is an enlarged view of part B in Figure 5;

[0043] Figure 7 is a schematic diagram of the structure of the third insulating block provided in an exemplary embodiment of this disclosure;

[0044] Figure 8 is a schematic diagram of the structure of an electrical device exemplarily shown according to this disclosure.

[0045] Explanation of reference numerals in the attached drawings: 1-Cover plate, 11-Connecting part, 111-First thickened area, 112-Second thickened area, 113-First connecting part, 114-Second connecting part. 12-Main body, 13-Avoidance hole, 2-Electrical core, 21-Electrical tab, 3-Electrical post assembly, 31-Positive electrode post assembly, 32-Negative electrode post assembly, 33-Guide block, 331-First mounting hole, 3311-Step surface, 3312-Large diameter section; 3313-Small diameter section; 332-Protrusion, 34-Electrical post body, 341-Protruding edge, 342-Sealing gasket, 35-First insulating block, 36-Busbar; 4-Adapter, 41-First plate, 411-Second mounting hole, 42-Second plate, 43-Third plate, 44-Second insulating block, 45-Operating space, 5-Bottom shell, 6-Third insulating block, 61-Accommodation space, 7-Battery, 8-Battery pack, 9-Electrical equipment. Detailed Implementation

[0046] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0047] In this disclosure, unless otherwise stated, directional terms generally refer to the control box provided in this disclosure under normal operating conditions. "Inner" and "outer" may refer to the inner and outer contours of the corresponding component or its location within or outside its environment, depending on the specific context. Furthermore, when the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications.

[0048] In the battery industry, to maximize battery energy density, it is typically necessary to reduce the thickness of the cover plate 1 and bottom shell 5 within the battery casing, allowing for more space within the casing to accommodate more electrode cores 2. Taking the blade battery as an example, in related technologies, the thickness of the cover plate 1 and bottom shell 5 within the battery casing is usually 0.1mm-0.3mm to maximize the space within the battery casing and improve battery energy density.

[0049] For ease of manufacturing, the cover plate 1 is usually constructed as a plate and is generally made of a plate of uniform thickness. Although it is easy to process, the thinner cover plate 1 is prone to deformation. When the battery expands due to gas, the edges of the cover plate 1 and the terminal assembly 3 will be squeezed together, causing stress concentration, which will cause cracks in the cover plate 1 and lead to battery leakage.

[0050] As shown in Figure 1, this disclosure provides a cover plate 1 for a battery, including a main body 12 and a connecting part 11 for connecting a terminal assembly 3. The thickness of the connecting part 11 is greater than the thickness of the main body 12, wherein the thickness of the main body 12 is 0.1mm-0.3mm.

[0051] Through the above technical solution, the main body 12, with a thickness of only 0.1mm-0.3mm, is prone to deformation in the cover plate 1. Therefore, a connecting part 11 with a thickness greater than that of the main body 12 is also required on the cover plate 1. The connecting part 11 is used to connect with the terminal assembly 3. When the terminal assembly 3 is connected to the connecting part 11, the connecting part 11 has higher strength than the main body 12 because its thickness is greater. Therefore, when the battery expands due to gas, even if the edges of the connecting part 11 and the terminal assembly 3 experience stress concentration due to mutual compression, the connecting part 11 will not crack due to its higher strength, preventing battery leakage. This ensures the service life and strength of the cover plate 1.

[0052] The ratio of the thickness of the connecting portion 11 to the thickness of the main body 12 can be 2-10. If the ratio is less than 2, the connecting portion 11 will be insufficiently thick, making it difficult to guarantee its strength, and it may crack under stress. If the ratio is greater than 10, the connecting portion 11 will be too thick. When the terminal assembly 3 is connected to the connecting portion 11, the dimensions of the terminal assembly 3 will be affected by the thickness of the connecting portion 11, causing interference between the terminal assembly 3 and other battery structures during battery assembly.

[0053] Specifically, the thickness of the connecting part 11 can be 0.8mm-2mm, further avoiding insufficient thickness of the connecting part 11 and avoiding excessive thickness of the connecting part 11.

[0054] The thickness of the connecting portion 11 can exhibit a negative correlation with the aforementioned ratio 2-10. For example, when the thickness of the main body 12 is 0.3 mm, the ratio selected when designing the connecting portion 11 can be relatively small to prevent the connecting portion 11 from being too thick. Conversely, when the thickness of the main body 12 is 0.1 mm, the ratio selected when designing the connecting portion 11 can be relatively large to prevent the connecting portion 11 from being insufficiently thick.

[0055] The thickness of the main body 12 can be the same as the thickness of the battery casing, allowing more space within the battery casing to accommodate more electrode cores 2 and maximizing battery energy density. As mentioned earlier, the battery casing is typically 0.1mm-0.3mm thick, so the thickness of the main body 12 can be 0.1mm-0.3mm, while the thickness of the connecting part 11 is greater than 0.3mm. Referring to Figure 6, the vertical direction in the drawing plane of Figure 6 represents the thickness direction of both the main body 12 and the connecting part 11.

[0056] The main body 12 can be understood as the portion of the cover plate 1 that is not connected to the terminal assembly 3. Due to the complexity of the battery design, the main body 12 does not have only one thickness. For example, the main body 12 may have insertion slots that can cooperate with other structures, or it may have protrusions that can cooperate with other structures. These structures will cause the thickness of the main body 12 to be different at different locations. However, for the purposes of this application, the thickness of the main body 12 mentioned in this application does not refer to the maximum or minimum thickness of the main body 12, but rather to the thickness that the main body 12 should have without interference from other structures.

[0057] It should be noted that the relative positions of the main body 12 and the connecting part 11 are not specifically limited in this disclosure, as long as the connecting part 11 does not interfere with other structures during battery assembly. In some embodiments, referring to FIG6, when the cover plate 1 is applied to the battery, one plate surface of the connecting part 11 is flush with one plate surface of the main body 12, and the other plate surface of the connecting part 11 protrudes beyond the plate surface of the main body 12. In other embodiments, the two connecting plate surfaces may each protrude beyond the plate surface of the main body 12. The main body 12 and the connecting part 11 can be integrally formed. Since the cover plate 1 is usually constructed as a plate, the main body 12 and the connecting part 11 can also be constructed as plates respectively. The integral forming of the main body 12 and the connecting part 11 results in higher edge strength of the main body 12 and the connecting part 11, further ensuring the strength of the connecting part 11.

[0058] The connecting part 11 can be located at the end of the main body 12. The end of the pole core 2 is usually provided with a pole tab 21, and the pole post assembly 3 needs to communicate with the pole tab 21. The position of the pole post assembly 3 needs to correspond with that of the pole tab 21 to facilitate the communication between the pole post assembly 3 and the pole tab 21. Therefore, the connecting part 11 can be located at the end of the main body 12 to facilitate the installation of the pole post assembly 3.

[0059] The two ends of the electrode core 2 are usually provided with electrode tabs 21, one is a positive electrode tab 21 and the other is a negative electrode tab 21. Correspondingly, the electrode post assembly 3 can also be provided with two, namely a positive electrode post assembly 31 and a negative electrode post assembly 32. In this case, the connecting part 11 can include a first connecting part 113 for connecting with the positive electrode post assembly 31 and a second connecting part 114 for connecting with the negative electrode post assembly 32. Specifically, as shown in Figure 1, the first connecting part 113 and the second connecting part 114 are respectively provided at both ends of the main body part 12.

[0060] As shown in Figures 2 to 7, according to a second aspect of this disclosure, a battery 7 is also provided, including an electrode core 2, an electrode post assembly 3 connected to the electrode core 2, a bottom shell 5 housing the electrode core 2, and a cover plate 1 for the battery according to any of the above embodiments, and having all its beneficial effects, which will not be repeated here. The cover plate 1 covers the bottom shell 5. The cover plate 1 can seal the bottom shell 5, preventing leakage of the battery 2.

[0061] In some embodiments, the projected area of ​​the connecting portion 11 on the surface of the cover plate 1 can be larger than the projected area of ​​the pole assembly 3 on the surface of the cover plate 1. Taking the main body 12 as a reference, that is, the projected area of ​​the connecting portion 11 on the main body 12 is larger than the projected area of ​​the pole assembly 3 on the main body 12. This ensures that there is sufficient contact area between the connecting portion 11 and the pole assembly 3, and that the edges of the pole assembly 3 are all located on the connecting portion 11, ensuring that areas of stress concentration are located on the thickened areas.

[0062] The ratio of the projected area of ​​the connecting part 11 on the surface of the cover plate 1 to the projected area of ​​the pole post assembly 3 on the surface of the cover plate 1 can be 1.1-2. If the ratio is less than 1.1, the edge of the pole post assembly 3 will be too close to the edge of the connecting part 11, and the connection between the connecting part 11 and the main body 12 will be prone to stress, which may lead to cracking of the main body 12. If the ratio is greater than 2, the connecting part 11 will occupy a larger area on the cover plate 1, causing the cover plate 1 to occupy more space.

[0063] In some embodiments, the electrode assembly 3 may include an electrode body 34, a current guide block 33, and a first insulating block 35. The electrode body 34 extends through the connecting portion 11; the current guide block 33 is connected to the portion of the electrode body 34 located outside the connecting portion 11 for connection to the busbar 36; the first insulating block 35 is disposed between the current guide block 33 and the connecting portion 11 to electrically isolate the current guide block 33 from the cover plate 1. The electrode body 34 extends through the connecting portion 11, allowing it to connect to the tab 21 at the end of the electrode core 2. The current guide block 33 is connected to the portion of the electrode body 34 located outside the connecting portion 11, so that current flows through the tab 21 to the electrode body 34, then through the electrode body 34 to the current guide block 33, and finally from the current guide block 33 to the busbar 36. Busbar 36 is typically located within the battery pack 8 and is a crucial component connecting the battery 7 and the circuitry. It distributes the electrical energy from the battery 7 to various circuits and concentrates the current from each circuit onto the battery 7, enabling efficient current flow and improving circuit stability and safety. The connection portion 11 may have a clearance hole 13 to avoid contact between the terminal body 34 and the connection portion 11. The terminal body 34 passes through the clearance hole 13 to penetrate the connection portion 11.

[0064] To ensure the strength of the battery casing 7, the cover plate 1 is usually made of metal. To prevent current loss or danger caused by contact between the current guide block 33 and the connecting part 11, a first insulating block 35 can be placed between the current guide block 33 and the connecting part 11 to electrically isolate the current guide block 33 from the cover plate 1. In this way, the current on the current guide block 33 will not flow to the cover plate 1, and the current will not be lost. At the same time, it also avoids the problem of current forming a circuit and causing danger when the current on the current guide block 33 flows to the cover plate 1.

[0065] In this disclosure, the shape of the first insulating block 35 is not limited, as long as it can electrically isolate the current guide block 33 from the cover plate 1. Referring to Figures 4, 5, and 6, the current guide block 33 surrounds the outer periphery of the pole body 34. Correspondingly, the first insulating block 35 can be constructed as a box, with the bottom wall of the box disposed between the current guide block 33 and the connecting part 11. The horizontal bottom wall also better conforms to the shape of the current guide block 33 and the connecting part 11. The side walls of the box can surround the outer wall surface of the current guide block 33, and the side walls insulate the outer wall surface of the current guide block 33, further ensuring the insulation effect of the first insulating block 35. It should be noted that the first insulating block 35 should not completely enclose the current guide block 33 to avoid the portion of the current guide block 33 used for connection with the busbar 36 being covered by the first insulating block 35, thus preventing the first insulating block 35 from affecting the electrical connection between the current guide block 33 and the busbar 36.

[0066] In some embodiments, multiple electrode bodies 34 can be provided, and multiple electrode bodies 34 are respectively connected to the tab 21. This can increase the connection area with the tab 21 and ensure the overcurrent capacity of the battery 7. For details, refer to Figure 4. In this case, two electrode bodies 34 are provided.

[0067] The end of the pole body 34 near the pole core 2 may have a radially outwardly extending flange 341 to abut against the cover plate 1 from the inside. The guide block 33 is fixedly connected to the other end of the pole body 34. The guide block 33 is used to abut the first insulating block 35 against the cover plate 1. The guide block 33 and the flange 341 are respectively disposed on both sides of the connecting part 11, as shown in Figures 5 and 6. At this time, the guide block 33 and the flange 341 are respectively disposed on both sides of the connecting part 11, that is, above and below the connecting part 11. In this way, when the flange 341 abuts against the connecting part 11 through the fourth insulating block and the guide block 33 abuts against the connecting part 11 through the first insulating block 35, the guide block 33 and the flange 341 can be clamped on the connecting part 11, and the position of the pole assembly 3 is fixed. At the same time, the position of the first insulating block 35 is also fixed. Furthermore, the pole assembly 3 can be riveted so that the guide block 33 and the protrusion 341 can be clamped on the connecting part 11, at which time the pole body 34 can play the role of a rivet.

[0068] The aforementioned fourth insulating block can be a sealing gasket 342 disposed between the protruding edge 341 and the cover plate 1, with the protruding edge 341 abutting against the cover plate 1 via the sealing gasket 342. The sealing gasket 342 can be fitted onto the pole body 34 and has a larger contact area with the protruding edge 341, ensuring the effectiveness of the fourth insulating block and preventing electrical connection between the pole assembly 3 and the connecting part 11.

[0069] A through first mounting hole 331 can be formed on the guide block 33. The first mounting hole 331 is a stepped hole with a large diameter section 3312 and a small diameter section 3313. The small diameter section 3313 is connected to the pole body 34, and the large diameter section 3312 is located at the end of the guide block 33 away from the pole core 2. There is a stepped surface 3311 between the large diameter section 3312 and the small diameter section 3313. The end face of the pole body 34 is flush with the stepped surface 3311. The pole body 34 does not need to protrude from the surface of the guide block 33. Through the large diameter section 3312, the small diameter section 3313, and the stepped surface 3311, the operator can more intuitively judge whether the pole body 34 protrudes from the surface of the guide block 33, and it is also convenient to adjust the pole body 34. If the end face of the pole body 34 is flush with the step surface 3311, it means that the pole body 34 does not protrude from the surface of the guide block 33. If the end face of the pole body 34 is not flush with the step surface 3311 and protrudes from the step surface 3311, then the operator can move the end face of the pole body 34 to be flush with the step surface 3311. There is no need to measure the position of the pole body 34 and then adjust its position.

[0070] The flow guide block 33 may also be provided with a protrusion 332, which is connected to the busbar 36 to increase the contact area between the flow guide block 33 and the busbar 36. By increasing the contact area between the flow guide block 33 and the busbar 36, the flow capacity of the flow guide block 33 can be further improved. In this disclosure, the position and shape of the protrusion 332 are not specifically limited, and can be adapted to the position and shape of the busbar 36.

[0071] The battery 7 may also include an adapter 4. A tab 21 is formed at the end of the electrode core 2. The adapter 4 is connected to both the tab 21 and the electrode post body 34. The electrode post body 34 is electrically connected to the electrode core 2 via the adapter 4. When multiple electrode post bodies 34 are provided, one adapter 4 can electrically connect multiple electrode post bodies 34 to the electrode core 2, facilitating the connection between the electrode post bodies 34 and the electrode core 2 by operators.

[0072] In some embodiments, the adapter 4 may include a first plate 41, a second plate 42, and a third plate 43. The first plate 41 is connected to the electrode body 34. The second plate 42 is disposed opposite to the first plate 41, and the second plate 42 is in contact with the electrode tab 21, forming an operating space 45 between the first plate 41 and the second plate 42. The third plate 43 is connected to both the first plate 41 and the second plate 42. The first plate 41 is connected to the electrode body 34 to fix the position of the adapter 4. The second plate 42 is in contact with the electrode tab 21, increasing the contact area with the electrode tab 21 and further ensuring the current carrying capacity. To prevent the second plate 42 from detaching from the tab 21 due to shaking during the use of the battery 7, the second plate 42 and the tab 21 can be welded together with their surfaces in contact. The operator can observe the second plate 42 and the tab 21 through the operating space 45, and the welding tools can also come into contact with the second plate 42 and the tab 21 through the operating space 45. The operator can weld the second plate 42 and the tab 21 through the operating space 45.

[0073] A second mounting hole 411 may be provided on the first plate 41, and the wall of the second mounting hole 411 is connected to the outer periphery of the pole body 34. Referring to Figure 6, when the pole body 34 is provided with a protrusion 341, the wall of the second mounting hole 411 can be connected to the protrusion 341. The first plate 41 is connected to the pole body 34 through the second mounting hole 411 and the protrusion 341. At the same time, the wall of the second mounting hole 411 is a surface connection, which further ensures the installation strength of the adapter 4.

[0074] The battery 7 may also include a second insulating block 44, which is respectively disposed on the surface of the adapter 4 facing the cover plate 1 and the surface facing the electrode core 2. Referring to Figures 5 and 6, the second insulating block 44 is disposed on the surface of the first plate 41 facing the cover plate 1 and also on the surface of the third plate 43 facing the electrode core 2. This prevents the adapter 4 from contacting the cover plate 1 and the electrode core 2, thus electrically isolating the adapter 4 from the cover plate 1 and the electrode core 2. This prevents current from flowing from the adapter 4 to the cover plate 1 or the electrode core 2, thus preventing current loss and avoiding the problem of current forming a circuit and causing danger if current flows from the adapter 4 to the cover plate 1 or the electrode core 2. In this disclosure, the shape of the second insulating block 44 is not limited, as long as the second insulating block 44 can electrically isolate the adapter 4 from the cover plate 1 and the electrode core 2. It should be noted that the second insulating block 44 must not obstruct the operating space 45.

[0075] The battery 7 may also include a third insulating block 6 disposed on the bottom shell 5. The third insulating block 6 includes a receiving space 61 with an opening, which surrounds the tab 21 and the first plate 41. As shown in Figures 5, 6, and 7, the third insulating block 6 disposed on the bottom shell 5 can surround the tab 21 and the first plate 41, which can prevent the tab 21 and the first plate 41 from being electrically connected to the bottom shell 5 when they shift due to shaking during use. Referring further to Figure 6, in Figure 6, the third insulating block 6 has a horizontal insulating plate disposed above the tab 21 and the first plate 41. This horizontal insulating plate can be configured to contact the first plate 41, so that the third insulating block 6 can better correspond to the position of the first plate 41 when it is installed. In this disclosure, the shape of the third insulating block 6 is not limited, as long as the third insulating block 6 can electrically isolate the tab 21 and the first plate 41 from the bottom shell 5.

[0076] In some embodiments, the battery 7 in this disclosure can be a blade battery, which has a unique elongated shape. For a blade battery, the length of the battery 7 can be 300mm-800mm. The width of the battery 7 can be 50mm-200mm. The thickness of the battery 7 can be 10mm-30mm.

[0077] According to a third aspect of this disclosure, a battery pack 8 is also provided, comprising a plurality of parallel-arranged batteries 7, wherein the batteries 7 are batteries 7 of any of the above embodiments and have all their beneficial effects, which will not be repeated here.

[0078] According to a fourth aspect of this disclosure, referring to FIG8, an electrical device 9 is also provided, including the battery pack 8 described above, and having all its beneficial effects, which will not be repeated here.

[0079] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not further describe the various possible combinations.

[0080] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cover plate (1) for a battery, characterized in that, It includes a main body (12) and a connecting part (11) for connecting the pole assembly (3), wherein the thickness of the connecting part (11) is greater than the thickness of the main body (12), and the thickness of the main body (12) is 0.1mm-0.3mm.

2. The cover plate (1) for a battery according to claim 1, characterized in that, The ratio of the thickness of the connecting part (11) to the thickness of the main body part (12) is 2-10.

3. The cover plate (1) for a battery according to claim 1 or 2, characterized in that, The thickness of the connecting part (11) is 0.8mm-2mm.

4. The cover plate (1) for a battery according to any one of claims 1-3, characterized in that, The main body (12) and the connecting part (11) are integrally formed.

5. The cover plate (1) for a battery according to any one of claims 1-4, characterized in that, The connecting part (11) is located at the end of the main body part (12).

6. The cover plate (1) for a battery according to any one of claims 1-5, characterized in that, The connecting part (11) includes a first connecting part (113) for connecting to the positive terminal assembly (31) and a second connecting part (114) for connecting to the negative terminal assembly (32), the first connecting part (113) and the second connecting part (114) being respectively disposed at both ends of the main body part (12).

7. A battery (7), characterized in that, The battery includes an electrode core (2), an electrode post assembly (3) connected to the electrode core (2), a bottom shell (5) housing the electrode core (2), and a cover plate (1) for the battery as described in any one of claims 1-6, the cover plate (1) covering the bottom shell (5).

8. The battery (7) according to claim 7, characterized in that, The projected area of ​​the connecting part (11) on the surface of the cover plate (1) is greater than the projected area of ​​the pole assembly (3) on the surface of the cover plate (1).

9. The battery (7) according to claim 7 or 8, characterized in that, The ratio of the projected area of ​​the connecting part (11) on the plate surface of the cover plate (1) to the projected area of ​​the pole assembly (3) on the plate surface of the cover plate (1) is 1.1-2.

10. The battery (7) according to any one of claims 7-9, characterized in that, The pole assembly (3) includes: The pole body (34) extends through the connecting part (11); The guide block (33) is connected to the part of the pole body (34) located outside the connecting part (11) and is used to connect to the busbar (36); A first insulating block (35) is disposed between the flow guide block (33) and the connecting portion (11) to electrically isolate the flow guide block (33) from the cover plate (1).

11. The battery (7) according to claim 10, characterized in that, The pole body (34) has a radially outwardly extending convex edge (341) at one end near the pole core (2) to abut against the cover plate (1) from the inside. The guide block (33) is fixedly connected to the other end of the pole body (34) and is used to abut the first insulating block (35) against the cover plate (1).

12. The battery (7) according to claim 11, characterized in that, A sealing gasket (342) is provided between the protruding edge (341) and the cover plate (1), and the protruding edge (341) abuts against the cover plate (1) through the sealing gasket (342).

13. The battery (7) according to any one of claims 10-12, characterized in that, The guide block (33) has a through first mounting hole (331), which is a stepped hole with a large diameter section (3312) and a small diameter section (3313). The small diameter section (3313) is connected to the pole body (34). The large diameter section (3312) is located at the end of the guide block (33) away from the pole core (2). There is a stepped surface (3311) between the large diameter section (3312) and the small diameter section (3313). The end face of the pole body (34) is flush with the stepped surface (3311).

14. The battery (7) according to any one of claims 10-13, characterized in that, The battery (7) also includes an adapter (4), and the end of the electrode core (2) is formed with a tab (21). The adapter (4) is connected to the tab (21) and the electrode post body (34) respectively. The electrode post body (34) is electrically connected to the electrode core (2) through the adapter (4).

15. The battery (7) according to claim 14, characterized in that, The adapter (4) includes: The first plate (41) is connected to the pole body (34); A second plate (42) is disposed opposite to the first plate (41), the second plate (42) is in contact with the tab (21), and an operating space (45) is formed between the first plate (41) and the second plate (42); and The third plate (43) is connected to the first plate (41) and the second plate (42) respectively.

16. The battery (7) according to claim 15, characterized in that, The first plate (41) has a second mounting hole (411), and the wall of the second mounting hole (411) is connected to the outer periphery of the pole body (34).

17. The battery (7) according to any one of claims 14-16, characterized in that, The battery (7) further includes a second insulating block (44), which is respectively disposed on the surface of the adapter (4) facing the cover plate (1) and the surface facing the electrode core (2).

18. The battery (7) according to claim 15 or 16, characterized in that, The battery (7) also includes a third insulating block (6) disposed on the bottom shell (5), the third insulating block (6) including a receiving space (61) with an opening, the receiving space (61) accommodating the tab (21) and the first plate (41).

19. The battery (7) according to any one of claims 7-18, characterized in that, The length of the battery (7) is 300mm-800mm.

20. The battery (7) according to any one of claims 7-18, characterized in that, The width of the battery (7) is 50mm-200mm.

21. The battery (7) according to any one of claims 7-18, characterized in that, The thickness of the battery (7) is 10mm-30mm.

22. A battery pack (8), characterized in that, It includes a plurality of parallel-arranged batteries (7), wherein the batteries (7) are the batteries (7) according to any one of claims 7-21.

23. An electrical appliance (9), characterized in that, Includes the battery pack (8) as described in claim 22.

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