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

Abstract

The utility model relates to a cover plate for a battery, the battery, a battery pack and electric equipment, the cover plate for the battery comprises a main body part and a connecting part for connecting a pole assembly, and the thickness of the main body part is 0.1 mm-0. 3mm. According to the technical scheme, in the cover plate, the main body part with the thickness of only 0.1 mm-0. 3mm is easy to deform, so that the connecting part with the thickness larger than that of the main body part needs to be arranged on the cover plate, the connecting part is used for being connected with the pole assembly, and after the pole assembly is connected with the connecting part, due to the fact that the thickness of the connecting part is larger than that of the main body part, the connecting part is not easy to deform. Therefore, compared with the main body part, the connecting part has higher strength. Therefore, when the battery expands due to gas, even if the connecting part and the edge of the pole assembly generate stress concentration due to mutual extrusion, the connecting part does not have cracks to cause the problem of battery leakage due to higher strength of the connecting part. And the service life and the use strength of the cover plate are ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular, to a cover plate for a battery, a battery, a battery pack, and an electrical device. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy. It usually includes a core, a battery pack bottom shell for supporting the core, and a cover plate. The cover plate is installed on the battery pack bottom shell. In order to facilitate the connection of the circuit, a pole assembly is usually provided on the cover plate. At the same time, the chemical substances in the battery, such as electrolyte, will produce a certain amount of gas when the battery is in use, causing the battery to swell. In related technologies, in order to reduce the volume and weight of the battery and increase the energy density of the battery, the thickness of the cover plate is usually thin. When the battery expands due to gas, the edges of the cover plate and the pole assembly will produce stress concentration due to mutual compression, causing cracks in the cover plate and leading to battery leakage. Utility Model Content

[0003] The purpose of the present 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 that stress concentration occurs at the edge of the contact surface between the pole assembly and the cover plate, which causes cracks in the cover plate.

[0004] The first object of the present disclosure is to provide a cover plate for a battery, comprising a main body and a connecting portion for connecting a pole assembly, wherein the thickness of the connecting portion is greater than that of the main body, wherein the thickness of the main body is 0.1 mm-0.3 mm.

[0005] Optionally, the ratio of the thickness of the connecting portion to the thickness of the main body portion is 2-10.

[0006] Optionally, the thickness of the connecting portion is 0.8 mm-2 mm.

[0007] Optionally, the main body and the connecting portion are integrally formed.

[0008] Optionally, the connecting portion is located at an end portion of the main body portion.

[0009] Optionally, the connecting portion includes a first connecting portion for connecting to the positive electrode pole assembly and a second connecting portion for connecting to the negative electrode pole assembly, and the first connecting portion and the second connecting portion are respectively provided at two ends of the main body.

[0010] A second object of the present disclosure is to provide a battery comprising a pole core, a pole column assembly connected to the pole core, a bottom shell accommodating the pole core, and a cover plate for a battery as described in any one of the above, wherein the cover plate covers the bottom shell.

[0011] Optionally, a projected area of the connecting portion on the surface of the cover plate is larger than a projected area of the pole assembly on the surface of the cover plate.

[0012] Optionally, a ratio of a projected area of the connecting portion on the plate surface of the cover plate to a projected area of the pole assembly on the plate surface of the cover plate is 1.1-2.

[0013] Optionally, the pole assembly includes:

[0014] a pole body, passing through the connecting portion;

[0015] a guide block connected to a portion of the pole body located outside the connecting portion and used for connecting to a busbar;

[0016] A first insulating block is provided between the guide block and the connecting portion to electrically isolate the guide block from the cover plate.

[0017] Optionally, one end of the pole body close to the pole core has a radially outwardly extending protrusion to push against the cover plate from the inside, and the guide block is fixedly connected to the other end of the pole body, and the guide block is used to push the first insulating block against the cover plate.

[0018] Optionally, a sealing gasket is provided between the convex edge and the cover plate, and the convex edge presses against the cover plate through the sealing gasket.

[0019] Optionally, a through first mounting hole is provided on the guide block, and the first mounting hole is a stepped hole having a large diameter section and a small diameter section, the small diameter section is connected to the pole body, the large diameter section is located at the end of the guide block away from the pole core, and there is a step surface between the large diameter section and the small diameter section, and the end face of the pole body is flush with the step surface.

[0020] Optionally, the battery further includes a converter, a pole lug is formed at the end of the pole core, the converter is respectively connected to the pole lug and the pole body, and the pole body is electrically connected to the pole core through the converter.

[0021] Optionally, the adapter includes:

[0022] A first plate body connected to the pole body;

[0023] a second plate body, disposed opposite to the first plate body, the second plate body being in surface contact with the tab body, and an operating space being formed between the first plate body and the second plate body; and

[0024] The third plate is connected to the first plate and the second plate respectively.

[0025] Optionally, a second mounting hole is formed on the first plate, and a hole wall of the second mounting hole is connected to the outer periphery of the pole body.

[0026] Optionally, the battery further includes a second insulating block, which is respectively arranged on a surface of the adapter facing the cover plate and a surface facing the pole core.

[0027] Optionally, the battery further includes a third insulating block disposed on the bottom shell, the third insulating block includes an accommodating space with an opening, and the accommodating space accommodates the tab and the first plate.

[0028] Optionally, the length of the battery is 300mm-800mm.

[0029] Optionally, the width of the battery is 50mm-200mm.

[0030] Optionally, the thickness of the battery is 10 mm to 30 mm.

[0031] A third object of the present disclosure is to provide a battery pack comprising a plurality of batteries arranged in parallel, wherein the batteries are any one of the batteries described above.

[0032] A fourth object of the present disclosure is to provide an electrical device comprising the above-mentioned battery pack.

[0033] Through the above technical solution, in the cover plate, the main body with a thickness of only 0.1mm-0.3mm is easy to deform, so the cover plate also needs to be provided with a connecting portion with a thickness greater than the main body. The connecting portion is used to connect to the pole assembly. When the pole assembly is connected to the connecting portion, since the thickness of the connecting portion is greater than the thickness of the main body, the connecting portion has higher strength than the main body. Therefore, when the battery expands due to gas, even if the edges of the connecting portion and the pole assembly will produce stress concentration due to mutual squeezing, due to the higher strength of the connecting portion, the connecting portion will not crack and cause battery leakage. The service life and usage strength of the cover plate are guaranteed. Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0035] Figure 1 is a structural schematic diagram of a cover plate provided by an exemplary embodiment of the present disclosure;

[0036] Figure 2 is a schematic structural diagram of a battery provided by an exemplary embodiment of the present disclosure;

[0037] Figure 3 yes Figure 2 Enlarged view of part A;

[0038] Figure 4 is a schematic diagram of the use of a cover plate and a pole assembly provided by an exemplary embodiment of the present disclosure;

[0039] Figure 5 is a cross-sectional view of a battery provided in accordance with an exemplary embodiment of the present disclosure;

[0040] Figure 6 yes Figure 5 Enlarged view of part B;

[0041] Figure 7 2 is a schematic structural diagram of a third insulating block provided in an exemplary embodiment of the present disclosure.

[0042] Description of Reference Numerals

[0043] 1-cover plate, 11-connecting part, 111-first thickened area, 112-second thickened area, 12-main body, 13-avoidance hole, 2-pole core, 21-pole ear, 3-pole assembly, 31-positive pole assembly, 32-negative pole assembly, 33-guide block, 331-first mounting hole, 3311-step surface, 332-bump, 34-pole body, 341-convex edge, 342-sealing gasket, 35-first insulating block, 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. DETAILED DESCRIPTION

[0044] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0045] In this disclosure, unless otherwise indicated, directional terms generally refer to the control box provided herein under normal use. "Inside" and "outside" can refer to the inside and outside of the corresponding component's outline or its location inside or outside the environment, depending on the specific context. Additionally, when the following description refers to the accompanying drawings, unless otherwise indicated, identical numbers in different drawings represent identical or similar elements. Terms such as "first" and "second" used in this disclosure are intended to distinguish one element from another and do not convey sequentiality or importance.

[0046] In the battery field, to maximize battery energy density, it is often necessary to reduce the thickness of the cover plate 1 and bottom shell 5 in the battery casing, thereby creating more space within the battery casing to accommodate more pole cores 2. Taking blade batteries as an example, in related art, the thickness of the cover plate 1 and bottom shell 5 in the battery casing is typically 0.1mm-0.3mm, maximizing the space within the battery casing and improving battery energy density.

[0047] For the convenience of manufacturing, the cover plate 1 is usually constructed in a plate shape and is generally manufactured using a plate of uniform thickness. Although it is easy to process, the thinner cover plate 1 is easy to deform. When the battery expands due to gas, the edges of the cover plate 1 and the terminal assembly 3 will produce stress concentration due to mutual compression, causing cracks in the cover plate 1 and leading to battery leakage.

[0048] like Figure 1 As shown, the present disclosure provides a cover plate 1 for a battery, comprising a main body 12 and a connecting portion 11 for connecting a pole assembly 3 , wherein the thickness of the connecting portion 11 is greater than that of the main body 12 , wherein the thickness of the main body 12 is 0.1 mm-0.3 mm.

[0049] Through the above technical solution, in the cover plate 1, the main body 12, which is only 0.1mm-0.3mm thick, is easily deformed. Therefore, the cover plate 1 also needs to be provided with a connecting portion 11 having a thickness greater than that of the main body 12. The connecting portion 11 is used to connect to the pole assembly 3. When the pole assembly 3 is connected to the connecting portion 11, since the thickness of the connecting portion 11 is greater than that of the main body 12, the connecting portion 11 has higher strength than the main body 12. Therefore, when the battery expands due to gas, even if the edges of the connecting portion 11 and the pole assembly 3 are squeezed together and stress concentration occurs, due to the higher strength of the connecting portion 11, the connecting portion 11 will not crack and cause battery leakage. This ensures the service life and usage strength of the cover plate 1.

[0050] 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 of the thickness of the connecting portion 11 to the thickness of the main body 12 is less than 2, the thickness of the connecting portion 11 will be insufficient, making it difficult to ensure the strength of the connecting portion 11, and the connecting portion 11 will also be at risk of cracking after being subjected to stress. If the ratio of the thickness of the connecting portion 11 to the thickness of the main body 12 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 size of the terminal assembly 3 will be affected by the thickness of the connecting portion 11, causing the terminal assembly 3 to interfere with other structures of the battery during assembly.

[0051] Specifically, the thickness of the connecting portion 11 may be 0.8 mm to 2 mm, further preventing the connecting portion 11 from being insufficiently thick and preventing the connecting portion 11 from being excessively thick.

[0052] The thickness of the connecting portion 11 may have a negative correlation with the ratio of 2-10 mentioned above. For example, when the thickness of the main body 12 is 0.3 mm, the ratio may be selected to be smaller when designing the connecting portion 11 to prevent the connecting portion 11 from being too thick. For another example, when the thickness of the main body 12 is 0.1 mm, the ratio may be selected to be larger when designing the connecting portion 11 to prevent the connecting portion 11 from being insufficiently thick.

[0053] The thickness of the main body 12 can be the same as the thickness of the battery shell, so that there is more space in the battery shell to install more pole cores 2, thereby increasing the battery energy density as much as possible. As mentioned above, the battery shell is usually 0.1mm-0.3mm, so the thickness of the main body 12 can be 0.1mm-0.3mm, and the thickness of the connecting part 11 is greater than 0.3mm. Figure 6 For reference, Figure 6 The up-down direction in the drawing is the thickness direction of the main body 12 and also the thickness direction of the connecting portion 11 .

[0054] 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 battery design, the main body 12 does not have only one thickness. For example, the main body 12 may be provided with a slot that can cooperate with other structures, or the main body 12 may be provided with a boss that can cooperate with other structures. These structures will make the thickness of the main body 12 different at different locations. For the purpose of this application, the thickness of the main body 12 mentioned in this application does not refer to the maximum thickness or minimum thickness of the main body 12, but the thickness that the main body 12 should have when there is no interference from other structures.

[0055] It should be noted that, in the present disclosure, the relative positions of the main body 12 and the connecting portion 11 are not specifically limited, as long as the connecting portion 11 does not interfere with other structures during the battery assembly process. Figure 6 When the cover plate 1 is applied to the battery, one plate surface of the connecting portion 11 is flush with one plate surface of the main body 12, and the other plate surface of the connecting portion 11 protrudes from the plate surface of the main body 12. In other embodiments, the two connected plate surfaces can protrude from the plate surfaces of the main body 12 respectively. The main body 12 and the connecting portion 11 can be integrally formed. Since the cover plate 1 is generally constructed in a plate shape, the main body 12 and the connecting portion 11 can also be constructed in a plate shape respectively. The main body 12 and the connecting portion 11 are integrally formed, so that the strength of the edges of the main body 12 and the connecting portion 11 is higher, and the strength of the connecting portion 11 is further guaranteed.

[0056] The connection portion 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 lug 21, and the pole assembly 3 needs to be connected to the pole lug 21. The pole assembly 3 needs to correspond to the position of the pole lug 21 to facilitate the connection between the pole assembly 3 and the pole lug 21. Therefore, the connection portion 11 can be located at the end of the main body 12 to facilitate the installation of the pole assembly 3.

[0057] The pole core 2 is usually provided with pole ears 21 at both ends, one is a positive pole ear 21, and the other is a negative pole ear 21. Correspondingly, the pole assembly 3 can also be provided with two, namely a positive pole assembly 31 and a negative pole assembly 32. In this case, the connecting portion 11 may include a first connecting portion 11 for connecting to the positive pole assembly 31 and a second connecting portion 11 for connecting to the negative pole assembly 32. For details, please refer to Figure 1 The first connecting portion 11 and the second connecting portion 11 are respectively provided at two ends of the main body portion 12 .

[0058] like Figures 2 to 7 As shown, according to the second aspect of the present disclosure, a battery is further provided, comprising a pole core 2, a pole post assembly 3 connected to the pole core 2, a bottom shell 5 accommodating the pole core 2, and a cover plate 1 for a battery according to any of the above embodiments, and having all the beneficial effects thereof, which will not be described in detail here, wherein the cover plate 1 covers the bottom shell 5. The cover plate 1 can seal the bottom shell 5 to prevent battery leakage.

[0059] In some embodiments, the projected area of the connection 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, the projected area of the connection 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 sufficient contact area between the connection portion 11 and the pole assembly 3, so that the edges of the pole assembly 3 are all located on the connection portion 11, ensuring that the areas where stress concentration occurs are all located in the thickened area.

[0060] The ratio of the projected area of the connection portion 11 on the surface of the cover plate 1 to the projected area of the pole assembly 3 on the surface of the cover plate 1 can be 1.1-2. If the ratio of the projected area of the connection portion 11 on the surface of the cover plate 1 to the projected area of the pole assembly 3 on the surface of the cover plate 1 is less than 1.1, the edge of the pole assembly 3 will be too close to the edge of the connection portion 11, and the connection point between the connection portion 11 and the main body 12 will also be easily subjected to stress, which may cause the main body 12 to crack. If the ratio of the projected area of the connection portion 11 on the surface of the cover plate 1 to the projected area of the pole assembly 3 on the surface of the cover plate 1 is greater than 2, the connection portion 11 will occupy a larger area on the cover plate 1, causing the cover plate 1 to occupy more space.

[0061] In some embodiments, the pole assembly 3 may include a pole body 34, a guide block 33, and a first insulating block 35. The pole body 34 passes through the connection portion 11; the guide block 33 is connected to the portion of the pole body 34 located outside the connection portion 11 for connection to the busbar; and the first insulating block 35 is disposed between the guide block 33 and the connection portion 11 to electrically isolate the guide block 33 from the cover plate 1. The pole body 34 passes through the connection portion 11 so that the pole body 34 can be connected to the tab 21 at the end of the pole core 2. The guide block 33 is connected to the portion of the pole body 34 located outside the connection portion 11, so that the current will move through the tab 21 to the pole body 34, then through the pole body 34 to the guide block 33, and finally from the guide block 33 to the busbar. The busbar, typically located within a battery pack, is a crucial component connecting the battery and the circuit. It distributes the battery's electrical energy to the various circuits and concentrates the current from each circuit onto the battery, enabling efficient current flow and improving circuit stability and safety. The connecting portion 11 may include a clearance hole 13 for the terminal body 34. This clearance hole 13 prevents contact between the terminal body 34 and the connecting portion 11. The terminal body 34 is provided with the clearance hole 13 to extend through the connecting portion 11.

[0062] To ensure the strength of the battery case, the cover plate 1 is typically made of metal. To prevent current loss or potential danger from contact between the guide block 33 and the connecting portion 11, a first insulating block 35 can be positioned between the guide block 33 and the connecting portion 11 to electrically isolate the guide block 33 from the cover plate 1. This prevents current from flowing from the guide block 33 to the cover plate 1, preventing current loss. This also prevents the current from flowing from the guide block 33 to the cover plate 1, potentially forming a loop and potentially causing danger.

[0063] In the present disclosure, the shape of the first insulating block 35 is not limited, as long as the first insulating block 35 can electrically isolate the guide block 33 and the cover plate 1. Figure 4 , Figure 5 and Figure 6 At this time, the guide block 33 is enclosed in the outer periphery of the pole body 34. Correspondingly, the first insulating block 35 can be constructed as a box, and the bottom wall of the box can be set between the guide block 33 and the connecting portion 11. The horizontal bottom wall also better fits the shape of the guide block 33 and the connecting portion 11. The side walls of the box can be enclosed in the outer wall surface of the guide block 33, and the side walls insulate the outer wall surface of the guide block 33, further ensuring the insulation effect of the first insulating block 35. It should be noted that the first insulating block 35 cannot completely wrap the guide block 33, so as to prevent the part of the guide block 33 used for connection to the bus from being covered by the first insulating block 35, and to prevent the first insulating block 35 from affecting the electrical connection between the guide block 33 and the bus.

[0064] In some embodiments, the pole body 34 may be provided with multiple pole bodies 34, and the multiple pole bodies 34 are respectively connected to the pole tab 21, so that the connection area with the pole tab 21 can be increased to ensure the overcurrent capacity of the battery. Figure 4 In this case, two pole bodies 34 are provided.

[0065] The end of the pole body 34 close to the pole core 2 may have a radially outwardly extending ridge 341 to abut 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 ridge 341 are respectively arranged on both sides of the connecting portion 11. For details, please refer to Figure 5 and Figure 6 In this case, the guide block 33 and the flange 341 are respectively arranged on either side of the connecting portion 11, namely above and below the connecting portion 11. Thus, when the flange 341 abuts against the connecting portion 11 via the fourth insulating block and the guide block 33 abuts against the connecting portion 11 via the first insulating block 35, the guide block 33 and the flange 341 are clamped to the connecting portion 11, thereby fixing the position of the pole assembly 3 and the first insulating block 35. Furthermore, the pole assembly 3 can be riveted to secure the guide block 33 and the flange 341 to the connecting portion 11, in which case the pole body 34 can function as a rivet.

[0066] The aforementioned fourth insulating block can be a sealing gasket 342 disposed between the flange 341 and the cover plate 1. The flange 341 is supported against the cover plate 1 by the sealing gasket 342. The sealing gasket 342 can be mounted on the pole body 34 and has a larger contact area with the flange 341, thereby ensuring the effectiveness of the fourth insulating block and preventing electrical connection between the pole assembly 3 and the connecting portion 11.

[0067] The guide block 33 may be provided with a through first mounting hole 331. The first mounting hole 331 is a stepped hole having a large diameter section and a small diameter section. The small diameter section is connected to the pole body 34, and the large diameter section is located at the end of the guide block 33 away from the pole core 2. A step surface 3311 is defined between the large and small diameter sections. The end face of the pole body 34 is flush with the step surface 3311. The pole body 34 does not need to protrude from the surface of the guide block 33. The large diameter section, small diameter section, and step surface 3311 allow operators to more intuitively determine whether the pole body 34 protrudes from the surface of the guide block 33, facilitating adjustment of 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, 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 the position of the pole body 34.

[0068] The guide block 33 may also be provided with a protrusion 332, which is connected to the busbar and serves to increase the contact area between the guide block 33 and the busbar. This increased contact area further improves the flow capacity of the guide block 33. In this disclosure, the position and shape of the protrusion 332 are not specifically limited, and can be designed to adapt to the position and shape of the busbar.

[0069] The battery may further include an adapter 4. The end of the pole core 2 is formed with a pole lug 21. The adapter 4 is connected to the pole lug 21 and the pole body 34, respectively. The pole body 34 is electrically connected to the pole core 2 through the adapter 4. When multiple pole bodies 34 are provided, one adapter 4 can electrically connect multiple pole bodies 34 to the pole core 2, making it easier for operators to electrically connect the pole bodies 34 to the pole core 2.

[0070] 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 pole body 34. The second plate 42 is arranged opposite to the first plate 41, and the second plate 42 is in surface contact with the pole tab 21. An operating space 45 is formed between the first plate 41 and the second plate 42. The third plate 43 is connected to the first plate 41 and the second plate 42, respectively. The first plate 41 is connected to the pole body 34 and is used to fix the position of the adapter 4. The second plate 42 is in surface contact with the pole tab 21, increasing the contact area with the pole tab 21 and further ensuring the flow capacity. In order to prevent the second plate 42 from being separated from the pole lug 21 due to shaking during the use of the battery, the second plate 42 and the pole lug 21 can be welded on the basis of surface contact. The operator can observe the second plate 42 and the pole lug 21 through the operating space 45, and the tools used for the welding operation can also contact the second plate 42 and the pole lug 21 through the operating space 45. The operator can weld the second plate 42 and the pole lug 21 through the operating space 45.

[0071] The first plate 41 may be provided with a second mounting hole 411, and the hole wall of the second mounting hole 411 is connected to the outer periphery of the pole body 34. Figure 6 When a protruding edge 341 is provided on the pole body 34, the hole wall of the second mounting hole 411 can be connected to the protruding edge 341, and the first plate body 41 is connected to the pole body 34 through the second mounting hole 411 and the protruding edge 341. At the same time, the hole wall of the second mounting hole 411 is surface-connected, further ensuring the installation strength of the adapter 4.

[0072] The battery may further include a second insulating block 44, which is respectively provided on the surface of the adapter 4 facing the cover plate 1 and the surface facing the pole core 2. Figure 5 and Figure 6, the second insulating block 44 is arranged on the surface of the first plate 41 facing the cover plate 1, and is also arranged on the surface of the third plate 43 facing the pole core 2, so as to avoid the adapter 4 from contacting the cover plate 1 and the pole core 2, so as to electrically isolate the adapter 4 from the cover plate 1 and the pole core 2. In this way, the current on the adapter 4 will not flow to the cover plate 1 or the pole core 2, and the current will not be lost. At the same time, it also avoids the problem that when the current on the adapter 4 flows to the cover plate 1 or the pole core 2, the current will form a loop and thus become dangerous. In the present disclosure, the shape of the second insulating block 44 is not limited, as long as it is ensured that the second insulating block 44 can electrically isolate the adapter 4 from the cover plate 1 and the pole core 2. It should be noted that the second insulating block 44 cannot block the operating space 45.

[0073] The battery may further include a third insulating block 6 disposed on the bottom shell 5. The third insulating block 6 includes an accommodating space 61 with an opening. The accommodating space 61 is enclosed by the tab 21 and the first plate 41. Figure 5 、 Figure 6 and Figure 7 As shown, the third insulating block 6 provided on the bottom shell 5 can be enclosed on 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 are displaced due to shaking during use. Figure 6 ,exist Figure 6 In the embodiment, the third insulating block 6 is provided with a horizontal insulating plate above the tab 21 and the first plate 41. The horizontal insulating plate can be configured to contact the first plate 41, so that when the third insulating block 6 is installed, it can better correspond to the position of the first plate 41. In the present disclosure, the shape of the third insulating block 6 is not limited, as long as the third insulating block 6 can ensure that the tab 21 and the first plate 41 are electrically isolated from the bottom case 5.

[0074] In some embodiments, the battery disclosed herein may be a blade battery. Blade batteries have a uniquely long and thin shape. For blade batteries, the battery length may be 300 mm to 800 mm, the battery width may be 50 mm to 200 mm, and the battery thickness may be 10 mm to 30 mm.

[0075] According to a third aspect of the present disclosure, a battery pack is further provided, comprising a plurality of batteries arranged in parallel, wherein the battery is a battery of any one of the above-mentioned embodiments and has all the beneficial effects thereof, which will not be described in detail here.

[0076] According to a fourth aspect of the present disclosure, there is also provided an electrical device comprising the above-mentioned battery pack and having all its beneficial effects, which will not be described in detail here.

[0077] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple variations can be made to the technical solutions of the present disclosure, and these simple variations all fall within the scope of protection of the present disclosure. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner unless there is any contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0078] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A cover for a battery, characterized in that: It comprises a main body and a connecting part for connecting a pole assembly, wherein the thickness of the connecting part is greater than that of the main body, wherein the thickness of the main body is 0.1mm-0.3mm; the main body and the connecting part are integrally formed.

2. The cover plate for a battery according to claim 1, characterized in that: The ratio of the thickness of the connecting portion to the thickness of the main body portion is 2-10.

3. The cover plate for a battery according to claim 1 or 2, characterized in that: The thickness of the connecting portion is 0.8 mm to 2 mm.

4. The cover plate for a battery according to claim 1, characterized in that: The connecting portion is located at an end portion of the main body portion.

5. The cover plate for a battery according to claim 1, characterized in that: The connecting portion includes a first connecting portion for connecting to a positive electrode pole assembly and a second connecting portion for connecting to a negative electrode pole assembly, and the first connecting portion and the second connecting portion are provided at both ends of the main body.

6. A battery, characterized in that: The invention comprises a pole core, a pole column assembly connected to the pole core, a bottom shell accommodating the pole core, and a cover plate for a battery according to any one of claims 1 to 5, wherein the cover plate covers the bottom shell.

7. The battery according to claim 6, characterized in that A projected area of the connecting portion on the plate surface of the cover plate is larger than a projected area of the pole assembly on the plate surface of the cover plate.

8. The battery according to claim 7, characterized in that The ratio of the projected area of the connecting portion on the plate surface of the cover plate to the projected area of the pole assembly on the plate surface of the cover plate is 1.1-2.

9. The battery according to claim 6, characterized in that The pole assembly comprises: a pole body, passing through the connecting portion; a guide block connected to a portion of the pole body located outside the connecting portion and used for connecting to a busbar; A first insulating block is provided between the guide block and the connecting portion to electrically isolate the guide block from the cover plate.

10. The battery according to claim 9, characterized in that One end of the pole body close to the pole core has a radially outwardly extending convex edge to press against the cover plate from the inside. The guide block is fixedly connected to the other end of the pole body and is used to press the first insulating block against the cover plate.

11. The battery according to claim 10, characterized in that A sealing gasket is provided between the convex edge and the cover plate, and the convex edge presses against the cover plate through the sealing gasket.

12. The battery according to claim 10, characterized in that A through first mounting hole is provided on the guide block, and the first mounting hole is a stepped hole having 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 step surface between the large diameter section and the small diameter section, and the end face of the pole body is flush with the step surface.

13. The battery according to claim 9, characterized in that The battery further includes a converter, a tab is formed at the end of the pole core, the converter is connected to the tab and the pole body respectively, and the pole body is electrically connected to the pole core through the converter.

14. The battery according to claim 13, characterized in that The adapter includes: A first plate body connected to the pole body; a second plate body, disposed opposite to the first plate body, the second plate body being in surface contact with the tab body, and an operating space being formed between the first plate body and the second plate body; and The third plate is connected to the first plate and the second plate respectively.

15. The battery according to claim 14, characterized in that A second mounting hole is formed on the first plate, and a hole wall of the second mounting hole is connected to the outer periphery of the pole body.

16. The battery according to claim 14, characterized in that The battery further includes a second insulating block, which is respectively arranged on a surface of the adapter facing the cover plate and a surface facing the pole core.

17. The battery according to claim 14, characterized in that The battery further includes a third insulating block disposed on the bottom shell. The third insulating block includes an accommodating space with an opening. The accommodating space accommodates the tab and the first plate.

18. The battery according to any one of claims 6 to 17, characterized in that: The length of the battery is 300mm-800mm.

19. The battery according to any one of claims 6 to 17, characterized in that: The width of the battery is 50 mm to 200 mm.

20. The battery according to any one of claims 6 to 17, characterized in that: The thickness of the battery is 10 mm to 30 mm.

21. A battery pack, characterized in that: The invention comprises a plurality of batteries arranged in parallel, wherein the batteries are the batteries according to any one of claims 6 to 20.

22. An electrical device, characterized in that: Comprising the battery pack described in claim 21.

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