Battery cover structure and battery

Abstract

This invention provides a battery cover structure and a battery. The battery cover structure includes: a terminal post; a current collector, the terminal post and the current collector being welded together by a welding flux; when the temperature between the terminal post and the current collector reaches a preset temperature, the welding flux melts, and the terminal post and the current collector are disconnected; at least one reset member, disposed between the terminal post and the current collector, one end of the reset member abutting against the terminal post, and the other end of the reset member abutting against the current collector; when the terminal post and the current collector are disconnected, the reset member provides a reset force to at least a portion of the terminal post, moving away from the current collector. This invention solves the problem in the prior art where a short circuit in a battery pack can lead to thermal runaway, thus affecting other batteries.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery cover structure and a battery. Background Technology

[0002] If a battery experiences an internal short circuit under normal operating conditions or after a collision, it can lead to thermal runaway. A large amount of heat will be released inside the battery pack. Some of this heat will be exchanged with the air inside the battery pack, while some will be transferred to other surrounding batteries through different paths. This can cause other batteries to absorb excess heat, leading to internal short circuits and triggering thermal runaway as well. Ultimately, this will affect the safety of electrical devices equipped with battery packs. For example, in electric vehicles, it can endanger the personal safety of the driver and passengers.

[0003] Therefore, existing technologies have the problem that a short circuit in one battery pack can lead to thermal runaway, which in turn affects other batteries. Utility Model Content

[0004] The main objective of this invention is to provide a battery cover structure and a battery to solve the problem in the prior art where a short circuit in a battery pack can lead to thermal runaway, which in turn affects other batteries.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery cover structure is provided, comprising: a terminal post; a current collector, wherein the terminal post and the current collector are welded together by a welding flux, and when the temperature between the terminal post and the current collector reaches a preset temperature, the welding flux melts, and the terminal post and the current collector are disconnected; at least one reset member, wherein the reset member is disposed between the terminal post and the current collector, one end of the reset member abuts against the terminal post, and the other end of the reset member abuts against the current collector; when the terminal post and the current collector are disconnected, the reset member provides a reset force to at least a portion of the terminal post away from the movement of the current collector.

[0006] Furthermore, a welding groove is provided on the side of the current collector facing the pole, and the welding groove is filled with welding flux.

[0007] Furthermore, the battery cover structure also includes: a cover body, which is disposed between the current collector and the terminal post, and the cover body is provided with a connection hole corresponding to the terminal post, and a reset member is provided in at least one connection hole.

[0008] Furthermore, the current collection component includes a welding protrusion extending into the connection hole, the welding protrusion having a welding groove within it.

[0009] Furthermore, the reset component is fitted onto the welding protrusion.

[0010] Furthermore, it also includes a sealing ring, at least a portion of which is disposed within the connection hole, and a reset element is disposed between the sealing ring and the welding protrusion.

[0011] Furthermore, the flux is a tin-based alloy and / or the preset temperature is 138℃-200℃.

[0012] Furthermore, the reset element is a reset spring.

[0013] Furthermore, an insulating layer is provided between the reset member and the pole post and / or between the reset member and the current collector.

[0014] According to another aspect of the present invention, a battery is provided, including the battery cover structure described above.

[0015] Applying the technical solution of this utility model, the battery cover structure in this application includes a terminal post, a current collector, and at least one reset member. The terminal post and the current collector are welded together with a welding flux. When the temperature between the terminal post and the current collector reaches a preset temperature, the welding flux melts, and the terminal post and the current collector are disconnected. The reset member is disposed between the terminal post and the current collector, with one end of the reset member abutting against the terminal post and the other end of the reset member abutting against the current collector. When the terminal post and the current collector are disconnected, the reset member provides a reset force to at least a portion of the terminal post to move away from the current collector.

[0016] When using the battery cover structure of this application, if a short circuit occurs in the battery, causing the battery temperature to rise, the temperature at the welded connection between the terminal and the current collector will also rise, causing the temperature between the terminal and the current collector to reach a preset temperature. This leads to the melting of the welding flux between the terminal and the current collector, causing the welded connection to fail. At this time, because a reset element is provided between the terminal and the current collector, the reset element can provide a reset force to the terminal, causing the terminal to move away from the current collector under the action of the reset element. This disconnects the electrical connection between the terminal and the current collector, preventing further rise in battery temperature and thus preventing thermal runaway. Furthermore, it prevents this battery from transferring heat to other batteries in the battery pack and affecting them. Therefore, the battery cover structure of this application effectively solves the problem in the prior art where a short circuit in a battery pack can cause thermal runaway, thus affecting other batteries. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the battery cover structure according to a specific embodiment of this application is shown;

[0019] Figure 2 This illustration shows a schematic diagram of the battery cover structure according to a specific embodiment of this application when the battery experiences thermal runaway;

[0020] Figure 3 An exploded view of a battery according to a specific embodiment of this application is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Terminal post; 11. Positive terminal post; 12. Negative terminal post; 20. Current collector component; 21. Current collector component body; 211. Welding groove; 212. Welding protrusion; 22. Cover plate body; 221. Connecting hole; 222. Mounting groove; 30. Reset component; 40. Sealing ring; 50. Housing assembly; 60. Cell assembly; 70. Insulating component. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0026] To address the problem in the prior art that thermal runaway of a battery in a battery pack can affect other batteries, this application provides a battery cover structure and a battery.

[0027] Furthermore, the battery in this application has the following battery cover structure.

[0028] like Figure 1 and Figure 2As shown, the battery cover structure in this application includes a terminal post 10, a current collector 20, and at least one reset member 30. The terminal post 10 and the current collector 20 are welded together by a welding flux. When the temperature between the terminal post 10 and the current collector 20 reaches a preset temperature, the welding flux melts, and the terminal post 10 and the current collector 20 are disconnected. The reset member 30 is disposed between the terminal post 10 and the current collector 20. One end of the reset member 30 abuts against the terminal post 10, and the other end of the reset member 30 abuts against the current collector 20. When the terminal post 10 and the current collector 20 are disconnected, the reset member 30 provides a reset force to at least a portion of the terminal post 10 away from the movement of the current collector 20.

[0029] When using the battery cover structure of this application, if a short circuit occurs in the battery and the battery temperature rises, the temperature at the welded connection between the terminal 10 and the current collector 20 also rises, causing the temperature between the terminal 10 and the current collector 20 to reach a preset temperature. Consequently, the flux between the terminal 10 and the current collector 20 melts, causing the welded connection between the terminal 10 and the current collector 20 to fail. At this time, since a reset member 30 is provided between the terminal 10 and the current collector 20, the reset member 30 can provide a reset force to the terminal 10, causing the terminal 10 to move away from the current collector 20 under the action of the reset member 30, thereby disconnecting the electrical connection between the terminal and the current collector 20. In other words, in this application, when the battery experiences thermal runaway and its temperature rises, the flux between the terminal 10 and the current collector 20 melts, causing the connection between them to switch from a stable connection to a disconnected connection. However, electrical conductivity may still exist between the terminal 10 and the current collector 20 at this time. Therefore, by providing the reset member 30, the terminal 10 and the current collector 20 can be separated, and the electrical conductivity can be broken. By disconnecting the electrical connection, further increases in battery temperature can be avoided, thus preventing thermal runaway and preventing the battery from transferring heat to other batteries in the battery pack, which could affect them. Therefore, the battery cover structure in this application effectively solves the problem in the prior art where a short circuit in a battery pack can lead to thermal runaway and affect other batteries.

[0030] It should be noted that the preset temperature in this application is generally required to be lower than the temperature at which the battery experiences thermal runaway. Furthermore, it should be noted that during the welding process between the terminal post 10 and the current collector 20 using flux, the reset member 30 is compressed, thereby ensuring that after the flux fails due to heat, the reset member 30 can provide a reset force for the terminal post 10 to move away from the current collector 20. In other words, when a short circuit occurs in the battery causing a temperature rise, the flux between the terminal post 10 and the current collector 20 melts, releasing the limiting effect of the terminal post 10 and the current collector 20 on the reset member 30, thus allowing the reset member 30 to drive the terminal post 10 to move.

[0031] Specifically, in this application, the flux can be a tin-based alloy. Correspondingly, the preset temperature range can be 138℃-200℃. Of course, the type of flux can be changed according to actual design requirements.

[0032] Specifically, the terminal 10 can be a positive terminal 11, with the corresponding current collector 20 being a positive current collector. Alternatively, the terminal 10 can be a negative terminal 12, with the corresponding current collector 20 being a negative current collector. A battery cover structure can have only one terminal 10 or two terminal 10s. When two terminal 10s are provided, preferably one is a positive terminal 11 and the other is a negative terminal 12, and a reset member 30 is provided between at least one of the positive terminal 11 and the negative terminal 12 and the corresponding current collector 20. Since disconnecting either the positive terminal 11 or the negative terminal 12 from the current collector 20 will disconnect the battery's electrical conduction, in this application, at least one reset member 30 is required between the terminal 10 and the current collector 20. The following description uses the example of simultaneously providing a positive terminal 11 and a negative terminal 12 on a battery cover.

[0033] Specifically, regarding the arrangement of the reset element 30, the reset element 30 can be disposed only between the positive terminal 11 and the positive current collector, or only between the negative terminal 12 and the negative current collector. Of course, the reset element 30 can also be disposed between both the positive terminal 11 and the positive current collector, and between both the negative terminal 12 and the negative current collector.

[0034] In this application, to ensure the effectiveness of the battery cover structure, two reset members 30 can be provided. One reset member 30 has its two ends abutting against the positive terminal 11 and the positive current collector, respectively, while the other reset member 30 has its two ends abutting against the negative terminal 12 and the negative current collector, respectively. Therefore, by providing two reset members 30 corresponding to the positive terminal 11 and the negative terminal 12, the safety performance and sensitivity of the battery cover structure can be effectively improved, effectively preventing the terminal 10 and the current collector 20 from failing to disconnect in time when a short circuit occurs in the battery. That is, in this application, there can be two reset members 30, with the positive terminal 11 and the negative terminal 12 abutting against different reset members 30.

[0035] Of course, depending on the actual design requirements, the number and arrangement of the reset components 30 can be adjusted accordingly. Furthermore, the positive terminal 11 and the negative terminal 12 can each have two or more reset components 30, so that when some of the reset components 30 fail, the positive terminal 11 and the negative terminal 12 can move away from the current collector 20 under the action of the other reset components 30.

[0036] Optionally, the reset element 30 is a reset spring.

[0037] In this application, in order to ensure that the positive terminal 11 and the negative terminal 12 can move more stably under the action of the reset force provided by the reset member 30, or in order to make the reset force on the positive terminal 11 and the negative terminal 12 more uniform, the reset member 30 can be made to abut against the center of the positive terminal 11 or the negative terminal 12.

[0038] Furthermore, to prevent the terminal post 10 and the current collector 20 from becoming electrically connected again via the reset member 30 after disconnection, an insulating layer is provided between the reset member 30 and the terminal post 10 and / or between the reset member 30 and the current collector 20. The insulating layer can be provided on the reset member 30, or on the terminal post 10 or the current collector 20. The insulating layer can be formed by spraying an insulating material or by covering it with an insulating film. For example, an insulating film can be applied to the outside of the reset member 30.

[0039] Optionally, the current collector 20 has a welding groove 211 on the side facing the pole post 10. The welding groove 211 is filled with welding flux, and the current collector 20 is welded to the pole post 10 through the welding flux in the welding groove 211. By providing a space for the welding flux, the welding between the current collector 20 and the pole post 10 can be more stable. Furthermore, this arrangement can also prevent the welding flux from contacting the reset member 30, thereby ensuring the performance of the reset member 30.

[0040] Specifically, the battery cover structure also includes a cover body 22. The cover body 22 is disposed between the current collector 20 and the terminal post 10, and the cover body 22 has a connection hole 221 corresponding to the terminal post 10. At least one resetting member 30 is disposed within the connection hole 221. Optionally, the current collector 20 includes a current collector body 21 and a welding protrusion 212, the welding protrusion 212 extending into the connection hole 221, and the welding protrusion 212 having a welding groove 211. This arrangement facilitates easier welding between the current collector 20 and the terminal post 10.

[0041] It can be calculated that, in this application, the reset member 30 can be sleeved on the welding protrusion 212, or the spring can be sleeved on the outside of the welding protrusion 212. And a clearance gap can be reserved between the spring and the welding protrusion 212.

[0042] Optionally, the current collector 20 further includes a sealing ring 40, at least a portion of which is disposed within the connecting hole 221, and a reset member 30 is disposed within the sealing ring 40, i.e., the reset member 30 is disposed between the sealing ring 40 and the welding protrusion 212. By providing the sealing ring 40, the sealing effect of the battery cover structure can be effectively guaranteed, thereby ensuring the performance of the battery cover structure.

[0043] Optionally, the cover plate body 22 is provided with mounting grooves 222 corresponding to the terminals 10, and at least a portion of the terminals 10 is disposed within the mounting grooves 222. Specifically, the cover plate body 22 is provided with mounting grooves 222 corresponding to the positive terminal 11 and the negative terminal 12, and at least a portion of the positive terminal 11 and the negative terminal 12 is disposed within the mounting grooves 222. By providing mounting grooves 222, the installation of the positive terminal 11, the negative terminal 12 and the cover plate body 22 can be positioned.

[0044] Of course, such as Figure 3 As shown, in this application, the battery may also have a casing assembly 50, a cell assembly 60, an insulator 70, and other structures. During battery assembly, the cell assembly 60 is disposed inside the casing assembly 50, and the cell assembly 60 is covered by an insulating structure (not shown in the figure). The top of the casing assembly 50 has an opening, and a battery cover structure is placed over the top opening of the casing assembly. An insulator 70 is provided between the battery cover structure and the cell assembly 60, and the tabs of the cell assembly 60 can extend from the insulator 70 and connect to the current collector 20 of the battery cover structure. Furthermore, to ensure the safety performance of the battery, a pressure relief valve or other structure may also be provided on the battery. It should be noted that in this application, the battery may have one battery cover structure or two battery cover structures. When the battery has one battery cover structure, the terminals 10 of the battery cover structure include a positive terminal 11 and a negative terminal 12. When the battery has two battery cover structures, the two battery cover structures can be arranged opposite to each other on the top and bottom surfaces of the battery. In this case, the terminal 10 of one battery cover structure is the positive terminal 11, and the terminal 10 of the other battery cover structure is the negative terminal 12.

[0045] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0046] 1. Effectively solves the problem in existing technologies where a short circuit in a battery pack can lead to thermal runaway, which in turn affects other batteries;

[0047] 2. Simple structure and stable performance.

[0048] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cover plate structure, characterized by, include: pole (10); The current collector (20) is connected to the pole (10) by welding flux. When the temperature between the pole (10) and the current collector (20) reaches a preset temperature, the welding flux melts and the pole (10) and the current collector (20) are disconnected. At least one reset member (30) is disposed between the pole post (10) and the current collector (20), one end of the reset member (30) abuts against the pole post (10), and the other end of the reset member (30) abuts against the current collector (20); When the pole post (10) and the current collector (20) are disconnected, the reset member (30) provides a reset force to at least a portion of the pole post (10) away from the movement of the current collector (20).

2. The battery cover plate structure according to claim 1, characterized by, The current collector (20) has a welding groove (211) on the side facing the pole (10), and the welding groove (211) is filled with the welding flux.

3. The battery cover plate structure of claim 2, wherein, The battery cover structure also includes: The cover plate body (22) is disposed between the current collecting member (20) and the pole post (10), and the cover plate body (22) is provided with a connection hole (221) corresponding to the pole post (10), and at least one of the connection holes (221) is provided with the reset member (30).

4. The battery cover plate structure according to claim 3, characterized by The current collecting member (20) includes a welding protrusion (212) extending into the connecting hole (221), the welding protrusion (212) having the welding groove (211).

5. The battery cover plate structure of claim 4, wherein, The reset component (30) is sleeved on the welding protrusion (212).

6. The battery cover plate structure of claim 5, wherein, It also includes a sealing ring (40), at least a portion of which is disposed within the connecting hole (221), and the reset member (30) is disposed between the sealing ring (40) and the welding protrusion (212).

7. The battery cover plate structure of claim 1, wherein The flux is a tin-based alloy and / or the preset temperature is 138℃-200℃.

8. The battery cover plate structure of claim 1, wherein, The reset element (30) is a reset spring.

9. The battery cover plate structure of claim 1, wherein, An insulating layer is provided between the reset member (30) and the pole post (10) and / or between the reset member (30) and the current collector (20).

10. A battery, characterized by The battery cover structure includes any one of claims 1 to 9.

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