Current collection assembly, battery and power utilization device

Abstract

The utility model discloses a current collecting assembly, a battery and an electric device, the current collecting assembly comprises a first current collecting piece, a second current collecting piece and a connecting piece, the second current collecting piece is connected with the tab, and the second current collecting piece is in contact connection with the first current collecting piece; the connecting piece is arranged at the contact part of the second current collecting piece and the first current collecting piece in a penetrating manner, and is used for fixedly connecting the first current collecting piece and the second current collecting piece; wherein the melting point of the connector is not greater than the battery safety temperature. Therefore, the two current collecting pieces of the current collecting assembly are connected through the connecting piece, the current passing capacity of the battery in daily use can be met, the melting point of the connecting piece is not larger than the safe temperature of the battery, when the battery is short-circuited, the temperature of the current collecting assembly continuously rises, and when the temperature exceeds the safe temperature of the battery, the connecting piece is molten, and the restraining force of the connecting piece on the two current collecting pieces disappears; the two current collecting pieces are disconnected, so that the operation of the battery is interrupted, the situations of battery fire, even explosion and the like can be avoided, and the safety of the battery can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting component, a battery provided with the current collecting component and an electrical device provided with the battery. Background Art

[0002] As the application fields of power batteries and energy storage batteries continue to expand, the safety performance of batteries has also received more and more attention; when the battery has an external short circuit and continues to discharge with a large current, the temperature of the pole increases and ignites the top cover patch, insulating rubber layer, etc., causing the battery to catch fire or explode, resulting in safety accidents. Therefore, preventing the occurrence of battery fire or explosion and ensuring the safety of the battery are technical problems that need to be solved urgently by those skilled in the art. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a current collecting assembly, a battery and an electrical device, which can solve the problems of explosion and fire caused by external short circuit of the battery.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A current collecting assembly, comprising:

[0006] A first current collecting member connected to the pole;

[0007] A second current collecting member connected to the electrode tab, wherein the second current collecting member is in contact with and connected to the first current collecting member;

[0008] A connecting member, which is inserted through a portion where the second current collecting member contacts the first current collecting member, and fixedly connects the first current collecting member and the second current collecting member;

[0009] Wherein, the melting point of the connecting piece is not greater than the safety temperature of the battery.

[0010] Optionally, in the above current collecting assembly, the first current collecting member defines a first through hole; the second current collecting member defines a second through hole;

[0011] The connecting member is inserted into the first through hole and the second through hole to fixedly connect the first current collecting member and the second current collecting member.

[0012] Optionally, in the above-mentioned current collecting assembly, the connecting member includes a first stop portion, a second stop portion and an intermediate portion connected between the first stop portion and the second stop portion, the intermediate portion is passed through the first through hole and the second through hole, the first stop portion is pressed to the surface of the first current collecting member away from the second current collecting member, and the second stop portion is pressed to the surface of the second current collecting member away from the first current collecting member.

[0013] Optionally, in the above current collecting assembly, along the thickness direction of the current collecting assembly, the projection of the first stopper is larger than the projection of the first through hole, and the projection of the second stopper is larger than the projection of the second through hole.

[0014] Optionally, in the above current collecting assembly, the first through hole is a stepped hole, and the stepped holes are sequentially a first hole and a second hole from inside to outside along the thickness direction, the diameter of the first hole is smaller than the diameter of the second hole, and along the thickness direction, the projection of the first stopper is larger than the projection of the first hole;

[0015] And / or, the second through hole is a stepped hole, and the stepped holes are successively a third hole and a fourth hole from inside to outside along the thickness direction, the diameter of the third hole is smaller than the diameter of the fourth hole, and along the thickness direction, the projection of the second stop portion is larger than the projection of the third hole.

[0016] Optionally, in the above-mentioned current collecting assembly, a pressing force of the first stopper and the second stopper between the first current collecting piece and the second current collecting piece is not less than 1000N.

[0017] Optionally, the current collecting assembly further comprises a bonding layer having a melting point not greater than the battery safety temperature.

[0018] Wherein, a bonding layer is provided between the contacting parts of the first current collecting member and the second current collecting member;

[0019] And / or, a bonding layer is provided between the contacting parts of the first current collecting member and the connecting member;

[0020] And / or, an adhesive layer is provided between the contact portions of the second current collecting member and the connecting member.

[0021] Optionally, in the above-mentioned current collecting assembly, the connecting member includes an insulating member or a metal member.

[0022] A battery comprises the above-mentioned current collecting assembly.

[0023] An electrical device comprises the above-mentioned battery.

[0024] It can be seen from the above technical scheme that the first current collecting member and the second current collecting member of the current collecting assembly of the utility model are connected by a connecting member, which can meet the current capacity of the battery for daily use. Moreover, since the melting point of the connecting member is not greater than the safe temperature of the battery, when the battery is short-circuited, the temperature of the current collecting assembly continues to rise. When the temperature exceeds the safe temperature of the battery, the connecting member melts, and the restraining force of the connecting member on the two current collecting members disappears. The first current collecting member is disconnected from the second current collecting member, so that the battery is interrupted from running, thereby avoiding the occurrence of battery fire or even explosion, and ensuring the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of a current collecting assembly provided in an embodiment of the utility model;

[0027] Figure 2 An exploded view of a current collecting assembly provided in an embodiment of the utility model;

[0028] Figure 3 A cross-sectional view of a current collecting assembly provided in an embodiment of the utility model.

[0029] in:

[0030] 1-first current collecting member, 11-first through hole, 2-second current collecting member, 21-second through hole,

[0031] 3-connecting piece, 31-first stopper, 32-second stopper, 33-middle part. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] like Figures 1 to 3As shown, the embodiment of the utility model provides a current collecting assembly, which can solve the problems of explosion and fire caused by external short circuit of the battery. The current collecting assembly is a component for transmitting current inside the battery, which is used to transfer the current of the bare battery cell to the pole and then conduct it to the outside.

[0035] First, the current collecting assembly includes a first current collecting part 1, a second current collecting part 2 and a connecting part 3, wherein the first current collecting part 1 is connected to the pole; the second current collecting part 2 is connected to the pole ear, and the second current collecting part 2 is in contact with the first current collecting part 1; the connecting part 3 is arranged at the contact part between the second current collecting part 2 and the first current collecting part 1, and the first current collecting part 1 and the second current collecting part 2 are fixedly connected; wherein the melting point of the connecting part 3 is not greater than the battery safety temperature. It should be noted that the battery safety temperature is the temperature that satisfies the battery to not catch fire or explode when the battery is short-circuited, and the melting point of the connecting part 3 is not less than the normal operating temperature of the battery, and it is necessary to ensure that when the battery is not in operation, the connecting part 3 will not melt when the storage environment temperature is high, and the first current collecting part 1 and the second current collecting part 2 will not be disconnected, and the subsequent use of the battery will not be affected by the disconnection of the first current collecting part 1 and the second current collecting part 2. In addition, the connecting member 3 can be a structural member that provides a pressing force to the first current collecting member 1 and the second current collecting member 2 ; the connecting member 3 can also be a structural member that provides a bonding force to the first current collecting member 1 and the second current collecting member 2 .

[0036] It can be seen that the first current collecting member 1 and the second current collecting member 2 of the current collecting assembly provided by the embodiment of the utility model are connected by the connecting member 3, which can meet the current capacity of the battery for daily use, and because the melting point of the connecting member 3 is not greater than the safe temperature of the battery, when the battery is short-circuited, the temperature of the current collecting assembly continues to rise. When the temperature reaches the melting point of the connecting member, the connecting member 3 melts, and the restraining force of the connecting member 3 on the two current collecting members disappears. The first current collecting member 1 is disconnected from the second current collecting member 2, so that the battery is interrupted. The operation can be avoided, and the battery fire or even explosion can be avoided, and the safety of the battery can be ensured.

[0037] In specific implementation, the first current collecting part 1 is provided with a first through hole 11; the second current collecting part 2 is provided with a second through hole 21; the connecting part 3 is passed through the first through hole 11 and the second through hole 21 to fix the first current collecting part 1 and the second current collecting part 2 in connection. The position of the through hole can be set in advance, and the relative position between the two current collecting parts can be accurately controlled, which helps to improve the accuracy and assembly efficiency of the structure. The cooperation between the through hole and the connecting part 3 can ensure that the connection has sufficient bearing capacity to withstand tensile, compressive, shear and other loads. And compared with the bonding connection method, the method of using the connecting part 3 to pass through the through hole is easier to ensure structural strength and has low cost.

[0038] In specific implementation, the connector 3 includes a first stopper 31, a second stopper 32, and an intermediate portion 33 connected between the first stopper 31 and the second stopper 32. The intermediate portion 33 is inserted into the first through hole 11 and the second through hole 21. The first stopper 31 is pressed to the surface of the first current collector 1 away from the second current collector 2, and the second stopper 32 is pressed to the surface of the second current collector 2 away from the first current collector 1. The two current collectors are fixedly connected by the pressing force provided by the first stopper 31 and the second stopper 32. The connector 3 can be a bolt, a pin, or a rivet, but is not limited thereto. The specific structure of the connector 3 can be specifically designed by those skilled in the art according to actual needs.

[0039] For specific implementation, see Figure 3 , along the thickness direction of the current collecting assembly, the projection of the first stopper 31 is larger than the projection of the first through hole 11, and the projection of the second stopper 32 is larger than the projection of the second through hole 21. It should be noted that the cross section of the connector 3 along the thickness direction is an I-shaped cross section, the projection of the first stopper 31 is larger than the projection of the first through hole 11, and the projection of the second stopper 32 is larger than the projection of the second through hole 21. Compared with the structure of the pin, the contact area between the first stopper 31 and the first current collecting component 1 and the contact area between the second stopper 32 and the second current collecting component 2 are larger, so that the force of the structure is more uniform.

[0040] In a specific implementation, the first through hole 11 is a stepped hole, and the stepped holes are sequentially the first hole and the second hole from the inside to the outside in the thickness direction, the diameter of the first hole is smaller than the diameter of the second hole, and the projection of the first stopper 31 is larger than the projection of the first hole in the thickness direction; and / or, the second through hole 21 is a stepped hole, and the stepped holes are sequentially the third hole and the fourth hole from the inside to the outside in the thickness direction, the diameter of the third hole is smaller than the diameter of the fourth hole, and the projection of the second stopper 32 is larger than the projection of the third hole in the thickness direction. That is, the first through hole 11 is a stepped hole, and the second through hole 21 is a non-stepped hole; or, the first through hole 11 is a non-stepped hole, and the second through hole 21 is a stepped hole; or, the first through hole 11 is a stepped hole, and the second through hole 21 is also a stepped hole. When the first through hole 11 is a stepped hole, the connector 3 can pass through the first hole and the second hole and be fixed in the first hole. The wall of the second hole and the platform surface (i.e., the platform surface connecting the first hole and the second hole) form a receiving groove for accommodating the first stopper 31. It should be noted that the hole depth of the second hole is not less than the dimension of the first stopper 31 along the thickness direction. At this time, the first stopper 31 will not protrude from the surface of the first current collector 1 along the thickness direction, which can reduce the space occupation of the current collector assembly and improve the space utilization rate and energy density. However, it is not limited to this. The hole depth of the second hole can also be less than the dimension of the first stopper 31 along the thickness direction. However, since part of the first stopper 31 falls into the receiving groove, compared with the case where the first stopper 31 completely protrudes from the surface of the first current collector 1, it can also reduce the space occupation of the current collector assembly and improve the space utilization rate and energy density. When the second through hole 21 is a stepped hole, the connector 3 can pass through the third hole and the fourth hole and be fixed in the third hole. The wall of the fourth hole and the platform surface (i.e., the platform surface connected to the third hole and the fourth hole) form a receiving groove for accommodating the second stopper 32. It should be noted that the hole depth of the fourth hole is not less than the dimension of the second stopper 32 along the thickness direction. At this time, the second stopper 32 will not protrude from the surface of the second current collector 2 along the thickness direction, which can reduce the space occupation of the current collector assembly and improve the space utilization rate and energy density. However, it is not limited to this. The hole depth of the fourth hole can also be less than the dimension of the second stopper 32 along the thickness direction. However, since part of the second stopper 32 falls into the receiving groove, compared with the case where the second stopper 32 completely protrudes from the surface of the second current collector 2, it can also reduce the space occupation of the current collector assembly and improve the space utilization rate and energy density.

[0041] In specific implementation, the clamping force between the first stopper 31 and the second stopper 32 is not less than 1000N. Making the position where the first current collector 1 and the second current collector 2 are in contact and connected (i.e., the position where the two fit together) fit more closely not only helps to enhance the structural stability between the components and prevent loosening or displacement caused by changes in internal stress during the battery charge and discharge cycle, but also can ensure the long-term reliability of the battery and its current carrying capacity. However, it is not limited to this, and the clamping force between the first current collector 1 and the second current collector 2 can be specifically designed by those skilled in the art according to actual needs.

[0042] In a specific implementation, it also includes an adhesive layer with a melting point not greater than the safety temperature of the battery, wherein an adhesive layer is arranged between the contact parts of the first current collector 1 and the second current collector 2, which can improve the fixing strength of the two current collectors and prevent shaking; and / or, an adhesive layer is arranged between the contact parts of the first current collector 1 and the connecting member 3, which can improve the fixing strength of the first current collector 1 and the connecting member 3 and prevent shaking; and / or, an adhesive layer is arranged between the contact parts of the second current collector 2 and the connecting member 3, which can improve the fixing strength of the second current collector 2 and the connecting member 3 and prevent shaking.

[0043] In specific implementation, the connector 3 includes an insulating member or a metal member. It should be noted that the connector 3 can be made of metal tin or plastic PP, and the specific material of the connector 3 can be specifically designed by those skilled in the art according to actual needs.

[0044] The embodiment of the utility model provides a battery, including the above-mentioned current collecting assembly, the current collecting assembly electrically connects the pole ear and the pole column to realize current flow. It should be noted that the connection position of the first current collector 1 and the second current collector 2 cannot interfere with the welding process and other processes in the subsequent battery preparation process. In addition, the first current collector 1 is connected to the pole column by laser welding, and the second current collector 2 is welded to the pole ear by ultrasonic welding, but it is not limited to this. The way the first current collector 1 is electrically connected to the pole column and the way the second current collector 2 is electrically connected to the pole ear can be specifically designed by those skilled in the art according to actual needs.

[0045] When external power is supplied, the current collecting assembly forms a passage with the pole ear, pole column and battery cell. When external short circuit occurs in the battery, the temperature of the first current collector 1 and the second current collector 2 in this passage rises under the condition of continuous discharge of large current, and the temperature of the connector 3 connected to the first current collector 1 and the second current collector 2 also rises. When the temperature rises to the melting point of the connector 3, the connector 3 begins to melt and deform, and loses the function of connecting the first current collector 1 and the second current collector 2. The first current collector 1 and the second current collector 2 separate after losing the external force provided by the connector 3, so that the battery in the short-circuit state is disconnected. The temperature of the battery after the disconnection no longer rises, the battery will not discharge with large current for a long time, the pole will not ignite the top cover patch of the battery cell or other batteries in the battery pack in a high-temperature oxygen or oxygen-rich environment, and will not expand the hazard of short circuit of the single battery cell. It can reduce economic losses, reduce the possibility of fire and explosion of the battery, and improve the safety performance of the short-circuited battery cell.

[0046] It can be seen that the two current collectors in the battery provided by the embodiment of the utility model are connected by the connector 3, which can meet the current capacity of the battery for daily use, and because the melting point of the connector 3 is not greater than the safe temperature of the battery, when the battery is short-circuited, the temperature of the current collecting assembly continues to rise. When the temperature exceeds the safe temperature of the battery, the connector 3 melts, and the restraining force of the connector 3 on the two current collectors disappears. The first current collector 1 is disconnected from the second current collector 2, so that the battery is interrupted. The operation can be avoided, and the battery fire or even explosion can be avoided, and the safety of the battery can be ensured.

[0047] An embodiment of the utility model provides an electrical device, comprising the above-mentioned battery.

[0048] The electrical device of the utility model is not particularly limited, and may include but is not limited to: laptop computers, pen-input computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD televisions, portable cleaners, portable CD players, mini CDs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.

[0049] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current collecting assembly, characterized in that: include: A first current collecting member (1) connected to the pole; A second current collecting member (2) connected to the electrode tab, wherein the second current collecting member (2) is in contact with and connected to the first current collecting member (1); A connecting member (3) is inserted into a portion where the second current collecting member (2) contacts the first current collecting member (1) and fixedly connects the first current collecting member (1) and the second current collecting member (2); Wherein, the melting point of the connecting member (3) is not greater than the battery safety temperature.

2. The current collecting assembly according to claim 1, characterized in that: The first current collecting member (1) is provided with a first through hole (11); the second current collecting member (2) is provided with a second through hole (21); The connecting member (3) is inserted into the first through hole (11) and the second through hole (21) to fixedly connect the first current collecting member (1) and the second current collecting member (2).

3. The current collecting assembly according to claim 2, characterized in that: The connecting member (3) comprises a first stopper (31), a second stopper (32), and an intermediate portion (33) connected between the first stopper (31) and the second stopper (32); the intermediate portion (33) is passed through the first through hole (11) and the second through hole (21); the first stopper (31) is pressed against a surface of the first current collecting member (1) away from the second current collecting member (2); and the second stopper is pressed against a surface of the second current collecting member (2) away from the first current collecting member (1).

4. The current collecting assembly according to claim 3, characterized in that: Along the thickness direction of the current collecting assembly, the projection of the first stopper (31) is larger than the projection of the first through hole (11), and the projection of the second stopper (32) is larger than the projection of the second through hole (21).

5. The current collecting assembly according to claim 3, characterized in that: The first through hole (11) is a stepped hole, and the stepped holes are sequentially a first hole and a second hole from inside to outside along the thickness direction, the diameter of the first hole is smaller than the diameter of the second hole, and along the thickness direction, the projection of the first stopper (31) is larger than the projection of the first hole; And / or, the second through hole (21) is a stepped hole, and the stepped holes are a third hole and a fourth hole from inside to outside along the thickness direction, the diameter of the third hole is smaller than the diameter of the fourth hole, and along the thickness direction, the projection of the second stop portion (32) is larger than the projection of the third hole.

6. The current collecting assembly according to claim 3, characterized in that: The first stopper (31) and the second stopper (32) are pressed between the first current collecting member (1) and the second current collecting member (2) with a pressing force of not less than 1000N.

7. The current collecting assembly according to claim 1, characterized in that: It also includes a bonding layer having a melting point not greater than the battery safety temperature, Wherein, an adhesive layer is provided between the contacting parts of the first current collecting member (1) and the second current collecting member (2); And / or, a bonding layer is provided between the contact portions of the first current collecting member (1) and the connecting member (3); And / or, an adhesive layer is provided between the contact portions of the second current collecting member (2) and the connecting member (3).

8. The current collecting assembly according to claim 1, characterized in that: The connecting member (3) comprises an insulating member or a metal member.

9. A battery, characterized in that: The invention comprises a current collecting assembly as described in any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

Images