Battery, battery pack and electric equipment

Abstract

The utility model provides a battery, a battery pack and electric equipment. The battery comprises a shell and a cover plate assembly, wherein a pole core body is arranged in the shell, the cover plate assembly is arranged on the shell, and at least part of the cover plate assembly is connected with a tab of the pole core body; the cover plate assembly has a first maximum length L1, the joint of the tab and the pole core body has a second maximum length L2, and the first maximum length L1 and the second maximum length L2 meet the condition that L2 / L1 is greater than or equal to 0.8 and less than or equal to 1. According to the battery with the structure, the connection area of the joint of the cover plate assembly and the tab can be increased, so that the over-current area of the cover plate assembly is increased, the current-carrying surface of the cover plate assembly is enlarged, the heating of the battery is reduced, the service life of the battery is prolonged, and the safety of the battery is improved; the problems that a battery is large in temperature rise, short in service life and poor in use safety are solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and in particular, to a battery, a battery pack, and an electrical device. Background Art

[0002] A battery is a power source that provides power for tools, and mostly refers to a storage battery or a rechargeable battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0003] A battery refers to a container that contains an electrolyte solution and electrodes to generate current, and can convert chemical energy into electrical energy. It has positive and negative electrodes. Among them, the negative electrode of the battery has a relatively thin electrode foil, a relatively high heat generation, and an explosion-proof valve is provided on the negative electrode cover.

[0004] However, the above-mentioned battery has problems of relatively large temperature rise, relatively low service life, and relatively poor use safety. Utility Model Content

[0005] The embodiments of the present application provide a battery, a battery pack, and an electrical device, which can solve the problems of relatively large temperature rise, relatively low service life, and relatively poor use safety of the battery.

[0006] The embodiments of the present application provide the following technical solutions:

[0007] In a first aspect of the embodiments of the present application, a battery is provided, including:

[0008] A housing, in which a core body is arranged;

[0009] A cover plate assembly, arranged on the housing, and at least part of the cover plate assembly is connected to the tab of the core body;

[0010] Wherein, the cover plate assembly has a first maximum length L1, and the connection part between the tab and the core body has a second maximum length L2, and the following is satisfied between the first maximum length L1 and the second maximum length L2:

[0011] 1>L2 / L1≥0.8.

[0012] For the battery with this structure, the cover plate assembly is arranged on the housing, and at least part of the cover plate assembly is connected to the electrode core body through the tab in the housing, and the cover plate assembly is used to form the positive or negative electrode of the battery to meet the normal use of the battery; the cover plate assembly has a first maximum length L1, and the connection part between the tab and the electrode core body has a second maximum length L2. The relationship between the first maximum length L1 and the second maximum length L2 satisfies: 1 > L2 / L1 ≥ 0.8. If L2 / L1 is equal to 1, it will cause the insulating ring on the cover plate assembly to be connected to the tab. Since the insulating ring is made of insulating material or weakly conductive material, it will lead to difficulties in processing at the connection between the insulating ring and the tab and cause waste of the tab; if L2 / L1 is less than 0.8, it will cause the connection area between the tab and the cover plate assembly to become smaller, thereby reducing the current-carrying surface of the cover plate assembly and the over-current area of the cover plate assembly, resulting in a larger temperature rise of the cover plate assembly, and reducing the service life and safety of the battery. By making the relationship between the first length L1 and the second length L2 satisfy: 1 > L2 / L1 ≥ 0.8, the connection area between the cover plate assembly and the tab can be increased, thereby increasing the over-current area of the cover plate assembly and making the current-carrying surface of the cover plate assembly larger, thus improving the performance of the battery; and it can reduce the connection difficulty between the tab and the cover plate assembly, with the advantage of convenient processing. Through this setting method, the connection area between the cover plate assembly and the tab can be increased, thereby increasing the over-current area of the cover plate assembly and making the current-carrying surface of the cover plate assembly larger, thus reducing the heat generation of the battery and improving the service life and safety of the battery.

[0013] Therefore, the battery provided by the embodiment of the present application can solve the problems of large temperature rise, low service life, and poor safety in use of the battery.

[0014] In a feasible implementation manner, the electrode core body has a third maximum length L3, and the relationship between the third maximum length L3 and the second maximum length L2 satisfies:

[0015] 1 ≥ L2 / L3 ≥ 0.8.

[0016] For a battery with this structure, if L2 / L3 is less than 0.8, it will cause the connection area at the joint of the tab and the core body to become smaller, thereby reducing the current-carrying surface area of the tab, the current-carrying area between the tab and the core body, resulting in a relatively large temperature rise between the tab and the core body, and reducing the service life and safety of the battery. By ensuring that the third maximum length L3 and the second maximum length L2 satisfy: 1≥L2 / L3≥0.8; the connection area at the joint of the tab and the core body can be increased, and the current-carrying surface area between the tab and the core body can be enlarged, thereby improving the performance of the battery; when increasing the connection area at the joint of the tab and the core body, the connection area between the side of the tab away from the core body and the cover plate assembly can be increased, thus playing a role in improving the performance of the battery.

[0017] In a feasible implementation, the first maximum length L1 and the second maximum length L2 satisfy:

[0018] 0mm<L1-L2≤6mm.

[0019] For a battery with this structure, if the difference between L1 and L2 is equal to 0, it will cause the insulating ring on the cover plate assembly to be connected to the tab. Since the insulating ring is made of insulating material or low-conductivity material, it will lead to difficulties in processing at the joint of the insulating ring and the tab and waste of the tab; if the difference between L1 and L2 is greater than 6 millimeters, it will cause the connection area at the joint of the tab and the cover plate assembly to become smaller, thereby reducing the current-carrying surface area of the cover plate assembly and the current-carrying area of the cover plate assembly, resulting in a relatively large temperature rise of the cover plate assembly, and reducing the service life and safety of the battery.

[0020] It should be noted that by increasing the connection area at the joint of the cover plate assembly and the tab, the current-carrying area of the cover plate assembly can be increased, and the current-carrying surface area of the cover plate assembly can be enlarged, thereby improving the performance of the battery; and the connection difficulty between the tab and the cover plate assembly can be reduced, with the advantage of convenient processing.

[0021] In a feasible implementation, the second maximum length L2 and the third maximum length L3 satisfy:

[0022] 0mm≤L3-L2≤4mm.

[0023] For a battery with this structure, if the difference between L3 and L2 is greater than 4 millimeters, it will cause the connection area at the joint of the tab and the core body to become smaller, thereby reducing the current-carrying surface area of the tab, the current-carrying area between the tab and the core body, resulting in a relatively large temperature rise between the tab and the core body, and reducing the service life and safety of the battery.

[0024] It should be noted that by reducing the exposed areas of the electrode core body and the tab, the connection area at the joint between the tab and the electrode core body can be increased, and the current-carrying surface between the tab and the electrode core body can be enlarged, thereby improving the performance of the battery; when the connection area at the joint between the tab and the electrode core body is increased, the connection area between the side of the tab facing away from the electrode core body and the cover plate assembly can be increased, thereby playing a role in improving the performance of the battery.

[0025] In a feasible implementation manner, the electrode core body has a first surface connected to the tab, and an included angle θ is formed between the outer side wall of the tab and the first surface;

[0026] The included angle θ satisfies: 95° ≥ θ ≥ 80°.

[0027] For the battery with this structure, by forming an included angle between the first surface and the outer side wall of the tab, the occurrence of tab bending can be reduced to improve the safety of the battery; and the occurrence of battery short circuit caused by the tab contacting the electrode core body can be avoided, thereby prolonging the service life of the battery.

[0028] In a feasible implementation manner, the electrode core body has a first surface connected to the tab, and an included angle θ is formed between the outer side wall of the tab and the first surface;

[0029] The included angle θ satisfies: 95° ≥ θ ≥ 90°.

[0030] For the battery with this structure, by forming an included angle between the first surface and the outer side wall of the tab, the occurrence of tab bending can be reduced to improve the safety of the battery; and the occurrence of battery short circuit caused by the tab contacting the electrode core body can be avoided, thereby prolonging the service life of the battery.

[0031] In a feasible implementation manner, the cover plate assembly includes:

[0032] A connection ring for connecting the housing;

[0033] An insulating ring connected to the housing through the connection ring;

[0034] A cover plate connected to the insulating ring, and at least part of the cover plate is connected to the tab.

[0035] For the battery with this structure, the setting of the connection ring can reduce the connection difficulty between the insulating ring and the battery housing, thereby improving the processing efficiency between the insulating ring and the housing; the insulating ring is used to isolate the direct contact between the cover plate and the battery housing, and the insulating ring can insulate and isolate the battery housing and the cover plate to reduce the occurrence of battery short circuit and provide safety protection for the battery, thereby prolonging the service life of the battery; the cover plate can be connected to the electrode core body of the battery through the tab of the battery, so that the cover plate can connect the internal and external circuits of the battery, thereby playing a role in transmitting current and leading out the voltage.

[0036] In a feasible implementation, it further includes: an explosion-proof valve, which is disposed on the cover plate or the housing.

[0037] For the battery with this structure, the explosion-proof valve is used to automatically open and release the internal pressure when the internal pressure of the battery abnormally rises, so as to prevent the battery from exploding, thereby prolonging the service life of the battery.

[0038] In a feasible implementation, it further includes: a liquid injection hole, which is opened on the cover plate.

[0039] For the battery with this structure, the liquid injection hole is used to add electrolyte towards the inside of the housing and prevent the electrolyte inside the battery from overflowing, thereby improving the safety of the battery.

[0040] The second aspect of the embodiments of the present application provides a battery pack, including a battery.

[0041] The third aspect of the embodiments of the present application provides an electrical device, including an electrical device, a battery or a battery pack, and the battery or the battery pack is used to provide electrical energy for the electrical device.

[0042] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, the other technical problems that the battery, battery pack and electrical device provided by the embodiments of the present application can solve, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0044] Figure 1 It is a schematic diagram of the main structure of the housing provided for the embodiments of the present application;

[0045] Figure 2 It is the first explosion structure schematic diagram of the cover plate assembly provided for the embodiments of the present application;

[0046] Figure 3 It is the second explosion structure schematic diagram of the cover plate assembly provided for the embodiments of the present application;

[0047] Figure 4 It is the connection structure schematic diagram of the electrode core body, electrode tab and cover plate assembly provided for the embodiments of the present application.

[0048] Description of reference numerals:

[0049] 100 - housing; 101 - electrode core body; 102 - tab; 103 - first surface;

[0050] 200 - cover plate assembly; 201 - connecting ring; 202 - insulating ring; 203 - cover plate;

[0051] 300 - explosion - proof valve;

[0052] 400 - liquid injection hole;

[0053] L1 - first maximum length;

[0054] L2 - second maximum length;

[0055] L3 - third maximum length;

[0056] θ - included angle. Detailed implementation manners

[0057] A battery is a power source that provides power for tools, mostly referring to a storage battery or rechargeable battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0058] A battery refers to a container filled with an electrolyte solution and electrodes to generate current, which can convert chemical energy into electrical energy. It has a positive electrode and a negative electrode. Among them, the negative electrode of the battery has a relatively thin electrode foil, generates a relatively high amount of heat, and an explosion - proof valve 300 is provided on the negative cover plate 203.

[0059] However, when installing the tab 102 of the above - mentioned battery, the installation position of the explosion - proof valve 300 needs to be avoided, which will result in a narrow installation area between the tab 102 and the negative cover plate 203, further exacerbating the problems of large temperature rise of the battery, low service life, and poor use safety.

[0060] Such as Figure 1 and Figure 2As shown in the figure, for the battery provided by the embodiment of the present application, the cover plate assembly 200 is arranged on the housing 100, and at least part of the cover plate assembly 200 is connected to the electrode core body 101 through the tab 102 inside the housing 100, and the cover plate assembly 200 is used to form the positive electrode or the negative electrode of the battery to meet the normal use of the battery; the cover plate assembly 200 has a first maximum length L1, and the connection part between the tab 102 and the electrode core body 101 has a second maximum length L2, and the relationship between the first maximum length L1 and the second maximum length L2 satisfies: 1 > L2 / L1 ≥ 0.8. By this setting method, the connection area at the connection part of the cover plate assembly 200 and the tab 102 can be increased, thereby increasing the current-carrying area of the cover plate assembly 200 and making the current-carrying surface of the cover plate assembly 200 larger, so as to improve the use performance of the battery; and the heat generation of the battery can be reduced, thereby improving the service life and safety of the battery.

[0061] The battery provided by the embodiment of the present application includes: a housing 100 and a cover plate assembly 200. Among them, an electrode core body 101 is arranged inside the housing 100; the cover plate assembly 200 is arranged on the housing 100, and at least part of the cover plate assembly 200 is connected to the tab 102 of the electrode core body 101; the cover plate assembly 200 has a first maximum length L1, and the connection part between the tab 102 and the electrode core body 101 has a second maximum length L2, and the relationship between the first maximum length L1 and the second maximum length L2 satisfies: 1 > L2 / L1 ≥ 0.8.

[0062] It should be noted that the first length L1 has various different setting methods. The setting methods of the first length L1 will be exemplified below in turn.

[0063] In a feasible embodiment, the first length L1 is: the surface of the cover plate assembly 200 that is coplanar or parallel to the plane where the connection part of the cover plate assembly 200 and the tab 102 is located. It can be understood that when the cover plate assembly 200 is square, the first length L1 is the extension length of the surface of the cover plate assembly 200 that is parallel to the plane where the connection part of the cover plate assembly 200 and the tab 102 is located; when the cover plate assembly 200 is circular, the first length L1 is the extension length of the surface of the cover plate assembly 200 that is coplanar with the plane where the connection part of the cover plate assembly 200 and the tab 102 is located.

[0064] In another feasible embodiment, the first length L1 is: the longest length within the positive projection of the outermost circle of the cover plate assembly 200 on the plane of the outer top wall of the cover plate assembly 200. It can be understood that when the cover plate assembly 200 is square, the first length L1 is the length of the straight line where the diagonal of the square is located; when the cover plate assembly 200 is circular, the first length L1 is the length of the straight line where the diameter of the circle is located.

[0065] It is understandable that the setting method of the first length L1 is not limited and can be selected according to actual usage requirements.

[0066] It should be noted that there are various different arrangement methods between the core body 101 and the tab 102. The arrangement methods between the core body 101 and the tab 102 will be exemplified below.

[0067] In a feasible implementation manner, the core body 101 has a tab 102, and along the preset installation direction, the tab 102 is connected to the core body 101; wherein, the second maximum length L2 is: along the preset installation direction, the connection length between the tab 102 and the core body 101.

[0068] In another feasible implementation manner, the core body 101 has a plurality of tabs 102, and along the preset installation direction, the plurality of tabs 102 are arranged at intervals on the core body 101; wherein, the second maximum length L2 is: in the preset installation direction, the distance between the first tab 102 and the last tab 102.

[0069] It is understandable that the arrangement method between the core body 101 and the tab 102 is not limited and can be selected according to actual usage requirements; when the arrangement method between the core body 101 and the tab 102 is not limited, the setting method of the second maximum length L2 is not limited and can be selected according to actual usage requirements.

[0070] As Figure 3 shown, it should be noted that the cover plate assembly 200 provided in the embodiment of the present application includes: a connection ring 201, an insulating ring 202, and a cover plate 203; wherein, the connection ring 201 is used to connect the housing 100; the insulating ring 202 is connected to the battery housing 100 through the connection ring 201; the cover plate 203 is connected to the insulating ring 202, and at least part of the cover plate 203 is connected to the tab 102.

[0071] It should be noted that the insulating ring 202 and the connection ring 201 are connected by brazing. Brazing connection can improve the connection strength between the connection ring 201 and the insulating ring 202, and can solve the problem of difficult welding caused by directly connecting the insulating ring 202 to the battery housing 100, and can provide safety protection for the core body 101 in the battery housing 100.

[0072] It should be noted that the connection ring 201 is a metal ring. The setting of the metal ring can reduce the connection difficulty between the connection ring 201 and the battery housing 100, thereby improving the processing efficiency between the battery cover plate 203 and the battery housing 100.

[0073] It should be noted that the cover plate 203 is made of a conductive material, and the conductive material can be connected to the electrode core body 101 of the battery through the tab 102 of the battery, so that the cover plate 203 can connect the inside and outside circuits of the battery, thereby playing a role in transmitting current and leading out voltage.

[0074] It should be noted that the insulating ring 202 is made of an insulating material or a material with weak conductivity. The insulating ring 202 is used to isolate the direct contact between the cover plate 203 and the battery housing 100, and the insulating ring 202 can insulate and isolate the battery housing 100 and the cover plate 203 to reduce the occurrence of battery short circuits and provide safety protection for the battery, thereby extending the service life of the battery.

[0075] It should be noted that there are various different ratios between the first maximum length L1 and the second maximum length L2. The ratios of the first maximum length L1 and the second maximum length L2 will be exemplified below.

[0076] In a feasible implementation manner, the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is 0.9, that is, the length of the end of the tab 102 connected to the electrode core body 101 is less than the length of the cover plate assembly 200. Through this setting method, the insulating ring 202 on the cover plate assembly 200 can be avoided to reduce the connection difficulty between the cover plate assembly 200 and the tab 102, and the processing cost of the tab 102 can be reduced.

[0077] In another feasible implementation manner, the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is 0.8, that is, the length of the end of the tab 102 connected to the electrode core body 101 is less than the length of the cover plate assembly 200. Through this setting method, the insulating ring 202 on the cover plate assembly 200 can be avoided to reduce the connection difficulty between the cover plate assembly 200 and the tab 102, and the processing cost of the tab 102 can be reduced.

[0078] It can be understood that the specific setting method of the ratio L2 / L1 of the first maximum length L1 and the second maximum length L2 is not limited and can be selected according to actual usage requirements, as long as 1>L2 / L1≥0.8 is ensured.

[0079] It should be noted that if L2 / L1 is equal to 1, it will cause the insulating ring 202 on the cover plate assembly 200 to be connected to the tab 102. Since the insulating ring 202 is made of insulating material or low-conductivity material, it will lead to great processing difficulty at the connection between the insulating ring 202 and the tab 102, and waste of the tab 102. If L2 / L1 is less than 0.8, the connection area at the connection between the tab 102 and the cover plate assembly 200 will become smaller, resulting in a smaller current-carrying surface of the cover plate assembly 200 and a reduction in the current-carrying area of the cover plate assembly 200, thereby causing a relatively large temperature rise of the cover plate assembly 200, and reducing the service life and safety of the battery. By making the first maximum length L1 and the second maximum length L2 satisfy: 1 > L2 / L1 ≥ 0.8; the connection area at the connection between the cover plate assembly 200 and the tab 102 can be increased, thereby increasing the current-carrying area of the cover plate assembly 200 and making the current-carrying surface of the cover plate assembly 200 larger, thus improving the performance of the battery; and the connection difficulty between the tab 102 and the cover plate assembly 200 can be reduced, having the advantage of convenient processing.

[0080] The electrode core body 101 provided by the embodiment of the present application has a third maximum length L3, and the third maximum length L3 and the second maximum length L2 satisfy: 1 ≥ L2 / L3 ≥ 0.8.

[0081] It should be noted that when obtaining the length values of the third maximum length L3 and the second maximum length L2, the third maximum length L3 and the second maximum length L2 need to be in the same direction to reduce the error between the third maximum length L3 and the second maximum length L2, thereby improving the measurement accuracy of the third maximum length L3 and the second maximum length L2.

[0082] It should be noted that the third maximum length L3 and the second maximum length L2 provided by the embodiment of the present application have various different ratios. The ratios of the third maximum length L3 and the second maximum length L2 will be exemplified below.

[0083] In a feasible implementation manner, the ratio L2 / L3 of the third maximum length L3 and the second maximum length L2 is 1, that is, the end of the tab 102 connected to the electrode core body 101 is laid on the electrode core body 101. At this time, the connection surface area between the tab 102 and the electrode core body 101 is large, and the area of the current-carrying surface between the tab 102 and the electrode core body 101 is large, thereby improving the performance of the battery.

[0084] In another feasible implementation, the ratio L2 / L3 of the third maximum length L3 to the second maximum length L2 is 0.8, that is, one end of the tab 102 connected to the electrode core body 101 is laid on the electrode core body 101. At this time, the connection surface area between the tab 102 and the electrode core body 101 is large, and the area of the current-carrying surface between the tab 102 and the electrode core body 101 is large, thereby improving the performance of the battery.

[0085] It can be understood that the ratio of the third maximum length L3 to the second maximum length L2 is not limited and can be selected according to actual usage requirements, as long as it satisfies 1≥L2 / L3≥0.8 between the third maximum length L3 and the second maximum length L2.

[0086] It should be noted that if L2 / L3 is less than 0.8, the connection area at the connection between the tab 102 and the electrode core body 101 will become smaller, resulting in a smaller current-carrying surface of the tab 102 and a smaller current-carrying area between the tab 102 and the electrode core body 101, thereby causing a relatively large temperature rise between the tab 102 and the electrode core body 101, and reducing the service life and safety of the battery. By making 1≥L2 / L3≥0.8 between the third maximum length L3 and the second maximum length L2, the connection area at the connection between the tab 102 and the electrode core body 101 can be increased, and the current-carrying surface between the tab 102 and the electrode core body 101 can be made larger, thereby improving the performance of the battery; when the connection area at the connection between the tab 102 and the electrode core body 101 is increased, the connection area between the side of the tab 102 away from the electrode core body 101 and the cover plate assembly 200 can be increased, thereby improving the performance of the battery.

[0087] In the embodiment of the present application, 0mm<L1-L2≤6mm is satisfied between the first maximum length L1 and the second maximum length L2.

[0088] It should be noted that there are various differences between the first maximum length L1 and the second maximum length L2. The differences between the first maximum length L1 and the second maximum length L2 will be exemplified below.

[0089] In a feasible implementation, the difference L1-L2 between the first maximum length L1 and the second maximum length L2 is 6 millimeters, that is, the length of one end of the tab 102 connected to the electrode core body 101 is 6 millimeters smaller than the length of the cover plate assembly 200. By this setting method, the insulating ring 202 on the cover plate assembly 200 can be avoided, so as to reduce the connection difficulty between the cover plate assembly 200 and the tab 102, and reduce the processing cost of the tab 102.

[0090] In another feasible embodiment, the difference L1 - L2 between the first maximum length L1 and the second maximum length L2 is 1 mm, that is, the length of the end of the tab 102 connected to the tab core body 101 is 1 mm smaller than the length of the cover plate assembly 200. By this setting method, the insulating ring 202 on the cover plate assembly 200 can be avoided, so as to reduce the connection difficulty between the cover plate assembly 200 and the tab 102, and the processing cost of the tab 102 can be reduced.

[0091] It can be understood that the specific value of the difference between the first maximum length L1 and the second maximum length L2 is not limited and can be selected according to actual usage requirements, as long as it is ensured that 0 mm < L1 - L2 ≤ 6 mm is satisfied between the first maximum length L1 and the second maximum length L2.

[0092] It should be noted that if the difference between L1 and L2 is equal to 0, it will cause the insulating ring 202 on the cover plate assembly 200 to be connected to the tab 102. Since the insulating ring 202 is made of insulating material or low-conductivity material, it will cause difficulties in processing the connection between the insulating ring 202 and the tab 102, and waste of the tab 102 will occur; if the difference between L1 and L2 is greater than 6 mm, it will cause the connection area between the tab 102 and the cover plate assembly 200 to become smaller, thereby reducing the current-carrying surface of the cover plate assembly 200 and the current-carrying area of the cover plate assembly 200, resulting in a larger temperature rise of the cover plate assembly 200, and a lower service life and worse safety of the battery.

[0093] It can be understood that 0 mm < L1 - L2 ≤ 6 mm is satisfied between the first maximum length L1 and the second maximum length L2. For a battery with this structure, by increasing the connection area between the cover plate assembly 200 and the tab 102, the current-carrying area of the cover plate assembly 200 can be increased, and the current-carrying surface of the cover plate assembly 200 can be made larger, thereby improving the performance of the battery; and the connection difficulty between the tab 102 and the cover plate assembly 200 can be reduced, which has the advantage of convenient processing.

[0094] In the embodiment of the present application, 0 mm ≤ L3 - L2 ≤ 4 mm is satisfied between the second maximum length L2 and the third maximum length L3.

[0095] It should be noted that there are various differences between the second maximum length L2 and the third maximum length L3. The differences between the second maximum length L2 and the third maximum length L3 will be exemplified below.

[0096] In a feasible implementation, the difference L3 - L2 between the second maximum length L2 and the third maximum length L3 is 4 millimeters, that is, the length of the electrode core body 101 is 4 millimeters longer than the length of the connection between the electrode core body 101 and the electrode tab 102. At this time, the connection surface area between the electrode tab 102 and the electrode core body 101 is large, and the area of the current-carrying surface between the electrode tab 102 and the electrode core body 101 is large, thereby improving the performance of the battery.

[0097] In another feasible implementation, the difference L3 - L2 between the second maximum length L2 and the third maximum length L3 is 0 millimeters, that is, the length of the electrode core body 101 is the same as the length of the connection between the electrode core body 101 and the electrode tab 102. At this time, the connection surface area between the electrode tab 102 and the electrode core body 101 is large, and the area of the current-carrying surface between the electrode tab 102 and the electrode core body 101 is large, thereby improving the performance of the battery.

[0098] It can be understood that the specific value of the difference L3 - L2 between the second maximum length L2 and the third maximum length L3 is not limited and can be selected according to actual usage requirements, as long as it satisfies 0mm ≤ L3 - L2 ≤ 4mm between the second maximum length L2 and the third maximum length L3.

[0099] It should be noted that if the difference of L3 - L2 is greater than 4 millimeters, the connection area at the connection between the electrode tab 102 and the electrode core body 101 will become smaller, resulting in a smaller current-carrying surface of the electrode tab 102 and a smaller current-carrying area between the electrode tab 102 and the electrode core body 101, thereby causing a relatively large temperature rise between the electrode tab 102 and the electrode core body 101, and reducing the service life and safety of the battery.

[0100] It can be understood that 0mm ≤ L3 - L2 ≤ 4mm is satisfied between the second maximum length L2 and the third maximum length L3. For the battery with this structure, by reducing the exposed area of the electrode core body 101 and the electrode tab 102, the connection area at the connection between the electrode tab 102 and the electrode core body 101 can be increased, and the current-carrying surface between the electrode tab 102 and the electrode core body 101 can be enlarged, thereby improving the performance of the battery; when the connection area at the connection between the electrode tab 102 and the electrode core body 101 is increased, the connection area between the side of the electrode tab 102 facing away from the electrode core body 101 and the cover plate assembly 200 can be increased, thereby improving the performance of the battery.

[0101] The electrode core body 101 provided by the embodiment of the present application has a first surface 103 connected to the electrode tab 102, and an included angle θ is formed between the outer side wall of the electrode tab 102 and the first surface 103; the included angle θ satisfies: 95° ≥ θ ≥ 80°

[0102] It should be noted that the included angle θ has various different degree settings. The degree of the included angle θ will be exemplified below in sequence.

[0103] In a feasible implementation manner, the degree of the included angle θ is 80 degrees, that is, an 80-degree angle is formed between the first surface 103 and the outer side wall of the tab 102. By this setting method, the bending of the tab 102 can be reduced, so as to reduce the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101, thereby improving the safety of the battery and extending the service life of the battery.

[0104] In another feasible implementation manner, the degree of the included angle θ is 95 degrees, that is, a 95-degree angle is formed between the first surface 103 and the outer side wall of the tab 102. By this setting method, the bending of the tab 102 can be reduced, so as to reduce the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101, thereby improving the safety of the battery and extending the service life of the battery.

[0105] It can be understood that the degree of the included angle θ is not limited and can be selected according to actual usage requirements, as long as it is ensured that the included angle θ satisfies: 95°≥θ≥80°.

[0106] It can be understood that by forming an included angle between the first surface 103 and the outer side wall of the tab 102, the occurrence of bending of the tab 102 can be reduced to improve the safety of the battery; and the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101 can be avoided, thereby extending the service life of the battery.

[0107] The electrode core body 101 provided by the embodiment of the present application has a first surface 103 connected to the tab 102, and an included angle θ is formed between the outer side wall of the tab 102 and the first surface 103; the included angle θ satisfies: 95°≥θ≥90°

[0108] It should be noted that the included angle θ has various different degree settings. The degree of the included angle θ will be exemplified below in sequence.

[0109] In a feasible implementation manner, the degree of the included angle θ is 90 degrees, that is, a 90-degree angle is formed between the first surface 103 and the outer side wall of the tab 102. By this setting method, the bending of the tab 102 can be reduced, so as to reduce the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101, thereby improving the safety of the battery and extending the service life of the battery.

[0110] In another feasible implementation manner, the degree of the included angle θ is 93 degrees, that is, a 93-degree angle is formed between the first surface 103 and the outer side wall of the tab 102. By this setting method, the bending of the tab 102 can be reduced, so as to reduce the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101, thereby improving the safety of the battery and extending the service life of the battery.

[0111] In addition, in another feasible embodiment, the degree of the included angle θ is 95 degrees, that is, a 95-degree angle is formed between the first surface 103 and the outer side wall of the tab 102. By this setting method, the bending of the tab 102 can be reduced, so as to reduce the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101, thereby improving the safety of the battery and extending the service life of the battery.

[0112] It can be understood that the degree of the included angle θ is not limited and can be selected according to actual usage requirements, as long as the included angle θ satisfies: 95°≥θ≥90°.

[0113] It can be understood that by forming an included angle between the first surface 103 and the outer side wall of the tab 102, the occurrence of tab 102 bending can be reduced to improve the safety of the battery; and the occurrence of battery short circuit caused by the contact between the tab 102 and the electrode core body 101 can be avoided, thereby extending the service life of the battery.

[0114] It should be noted that in the related art, the electrode core body 101 is arranged in the housing 100, and the electrode core body 101 is responsible for the progress of the electrochemical reaction and the storage and release of electric energy. The electrode core body 101 includes: a plurality of positive electrode plates, a plurality of negative electrode plates and a plurality of separators. Among them, a separator is arranged between a positive electrode plate and a negative electrode plate, and the separator is used to prevent the direct contact between the positive electrode plate and the negative electrode plate from causing a battery short circuit. The plurality of positive electrode plates are electrically connected to a cover plate 203 through the tab 102, and the cover plate 203 connected to the positive electrode plate forms a positive electrode cover plate 203; the plurality of negative electrode plates are electrically connected to another cover plate 203 through the tab 102, and the cover plate 203 connected to the negative electrode plate forms a negative electrode cover plate 203.

[0115] In the battery provided by the embodiment of the present application, the cover plate assembly 200 has multiple different functions. The functions of the cover plate assembly 200 will be exemplified below.

[0116] In a feasible embodiment, the cover plate assembly 200 forms the positive electrode cover plate 203 of the battery. The positive electrode cover plate 203 is arranged on the housing 100, and the connecting ring 201 is used to connect the positive electrode cover plate 203 and the housing 100; the positive electrode cover plate 203 can increase the current-carrying surface of the positive electrode of the battery, so as to improve the current-carrying capacity of the battery, thereby improving the performance of the battery.

[0117] In another feasible embodiment, the cover plate assembly 200 forms the negative electrode cover plate 203 of the battery. The negative electrode cover plate 203 is arranged on the housing 100, and the connecting ring 201 is used to connect the negative electrode cover plate 203 and the housing 100; the negative electrode cover plate 203 can increase the current-carrying surface of the negative electrode of the battery, so as to improve the current-carrying capacity of the battery, thereby improving the performance of the battery.

[0118] In addition, in another feasible embodiment, there are two cover plate assemblies 200. One of the cover plate assemblies 200 forms the positive cover plate 203 of the battery. The positive cover plate 203 is arranged on the housing 100, and a connecting ring 201 is used to connect the positive cover plate 203 and the housing 100. The other cover plate assembly 200 forms the negative cover plate 203 of the battery. The negative cover plate 203 is arranged on the housing 100, and another connecting ring 201 is used to connect the negative cover plate 203 and the housing 100. Among them, the positive cover plate 203 can increase the current-carrying surface of the positive electrode of the battery to improve the current-carrying capacity of the battery, thereby improving the service performance of the battery. The negative cover plate 203 can increase the current-carrying surface of the negative electrode of the battery to improve the current-carrying capacity of the battery, thereby improving the service performance of the battery.

[0119] It can be understood that the specific functions of the cover plate assembly 200 are not limited and can be selected according to actual usage requirements.

[0120] It should be noted that the connection between the connecting member and the housing 100 is carried out by low-temperature welding. Low-temperature welding can reduce the damage to the electrode core body 101 and the electrode tab 102 in the housing 100 caused by high temperature, so as to protect the electrode core body 101 and the electrode tab 102 in the housing 100 safely, improve the connection efficiency between the housing 100 and the connecting member, and thus improve the yield rate of the battery.

[0121] As Figure 4 shown, the battery provided by the embodiment of the present application further includes: an explosion-proof valve 300. The explosion-proof valve 300 is used to automatically open and release the internal pressure when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding.

[0122] It should be noted that the explosion-proof valve 300 has a variety of different installation positions. The installation positions of the explosion-proof valve 300 will be exemplified below.

[0123] In a feasible embodiment, the explosion-proof valve 300 is installed on the negative cover plate 203. One end of the explosion-proof valve 300 is arranged facing away from the negative cover plate 203, and the other end of the explosion-proof valve 300 extends into the interior of the housing 100. The explosion-proof valve 300 can play a role in preventing the battery from exploding, so as to protect the battery safely.

[0124] In another feasible embodiment, the explosion-proof valve 300 is installed on the positive cover plate 203. One end of the explosion-proof valve 300 is arranged facing away from the positive cover plate 203, and the other end of the explosion-proof valve 300 extends into the interior of the housing 100. The explosion-proof valve 300 can play a role in preventing the battery from exploding, so as to protect the battery safely.

[0125] In addition, in other feasible embodiments, the explosion-proof valve 300 is installed on the shell 100, one end of the explosion-proof valve 300 is set toward the side away from the pole core body 101, and the other end of the explosion-proof valve 300 extends toward the side close to the pole core body 101. The explosion-proof valve 300 can prevent the battery from exploding to protect the battery safely.

[0126] It is understandable that the specific installation position of the explosion-proof valve 300 is not limited and can be selected according to actual usage requirements.

[0127] The battery provided in the embodiment of the present application further includes: a liquid injection hole 400, which is used to add electrolyte toward the inside of the shell 100 and prevent the electrolyte inside the battery from overflowing.

[0128] It should be noted that the liquid injection hole 400 has a variety of different installation positions, and the installation positions of the liquid injection hole 400 are illustrated below one by one.

[0129] In a feasible embodiment, the injection hole 400 is installed on the negative electrode cover plate 203, one end of the injection hole 400 is set toward the side away from the negative electrode cover plate 203, and the other end of the injection hole 400 extends into the interior of the shell 100. The setting of the injection hole 400 can facilitate the operator to add electrolyte toward the interior of the shell 100, and can prevent the electrolyte inside the battery from overflowing, so as to safely protect the battery.

[0130] In another feasible embodiment, the injection hole 400 is installed on the positive cover plate 203, one end of the injection hole 400 is set toward the side away from the positive cover plate 203, and the other end of the injection hole 400 extends into the interior of the shell 100. The setting of the injection hole 400 can facilitate the operator to add electrolyte toward the interior of the shell 100, and can prevent the electrolyte inside the battery from overflowing, so as to safely protect the battery.

[0131] It is understandable that the specific installation position of the injection hole 400 is not limited and can be selected according to actual usage requirements.

[0132] The battery provided in the embodiment of the present application further includes: an electrode, which is used to connect the internal and external circuits of the battery and plays a role in transmitting the current in the circuit and drawing out the voltage.

[0133] It should be noted that the pole has a variety of different installation positions, and the installation positions of the poles are described below with examples.

[0134] In a feasible implementation, the terminal post is mounted on the negative electrode cover plate 203. One end of the terminal post is arranged towards the side away from the negative electrode cover plate 203, and the other end of the terminal post is electrically connected to the negative electrode cover plate 203. The arrangement of the terminal post can connect the inside of the battery with the external circuit, serving to transfer the current in the circuit and lead out the voltage.

[0135] In another feasible implementation, the terminal post is mounted on the positive electrode cover plate 203. One end of the terminal post is arranged towards the side away from the positive electrode cover plate 203, and the other end of the terminal post is electrically connected to the positive electrode cover plate 203. The arrangement of the terminal post can connect the inside of the battery with the external circuit, serving to transfer the current in the circuit and lead out the voltage.

[0136] It can be understood that the specific installation position of the terminal post is not limited and can be selected according to actual usage requirements.

[0137] The embodiment of the present application further provides a battery pack, including the battery described in any of the above embodiments.

[0138] The embodiment of the present application further provides an electrical device, including an electrical device, the battery described in any of the above embodiments or the battery pack described in any of the above embodiments. The battery or the battery pack is used to provide electrical energy for the electrical device.

[0139] The electrical device in the embodiment of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0140] In addition, the electrical device can also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecrafts, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles or spaceships.

[0141] In view of the fact that the electrical device in this embodiment includes the battery or the battery pack described in any of the above embodiments, therefore, the electrical device includes the battery or the battery pack structure and beneficial effects, which will not be elaborated in detail in this embodiment.

[0142] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other.

[0143] It should be noted that the embodiments referred to in the specification as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining a specific feature, structure or characteristic with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that, Comprising: A housing (100), within which a core body (101) is disposed; A cover assembly (200), disposed on the housing (100), and at least a part of the cover assembly (200) is connected to the tab (102) of the core body (101); Wherein, the cover assembly (200) has a first maximum length L1, the connection portion between the tab (102) and the core body (101) has a second maximum length L2, and the following is satisfied between the first maximum length L1 and the second maximum length L2: 1 > L2 / L1 ≥ 0.

8.

2. A battery according to claim 1, characterized in that, The core body (101) has a third maximum length L3, and the following is satisfied between the third maximum length L3 and the second maximum length L2: 1 ≥ L2 / L3 ≥ 0.

8.

3. A battery according to claim 1, characterized in that, The following is satisfied between the first maximum length L1 and the second maximum length L2: 0mm < L1 - L2 ≤ 6mm.

4. A battery according to claim 2, characterized in that, The following is satisfied between the second maximum length L2 and the third maximum length L3: 0mm ≤ L3 - L2 ≤ 4mm.

5. A battery according to claim 1, wherein The core body (101) has a first surface (103) connected to the tab (102), and an included angle θ is formed between the outer side wall of the tab (102) and the first surface (103); The included angle θ satisfies: 95° ≥ θ ≥ 80°.

6. A battery according to claim 1, characterized in that, The core body (101) has a first surface (103) connected to the tab (102), and an included angle θ is formed between the outer side wall of the tab (102) and the first surface (103); The included angle θ satisfies: 95° ≥ θ ≥ 90°.

7. A battery according to claim 1, characterized in that, The cover assembly (200) includes: A connection ring (201), used to connect the housing (100); An insulating ring (202), connected to the housing (100) through the connection ring (201); A cover (203), connected to the insulating ring (202), and at least a part of the cover (203) is connected to the tab (102).

8. A battery according to claim 7, characterized in that, Further comprising: An explosion-proof valve (300), disposed on the cover (203) or the housing (100).

9. A battery according to claim 7, characterized in that, Further comprising: A liquid injection hole (400), formed on the cover (203).

10. A battery pack, characterized in that, Comprising the battery according to any one of claims 1 - 9.

11. An electrical device, characterized in that, Comprising an electrical device, the battery according to any one of claims 1 - 9 or the battery pack according to claim 10; The battery or the battery pack is used to provide electrical energy for the electrical device.

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