Battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and electric equipment. The battery provided by the utility model comprises a shell and a tab assembly, at least one pressure relief area is formed on the shell, and the pressure relief area is broken when the battery is in thermal runaway. The tab assembly comprises a plurality of tabs, and at least part of the tabs are electrically connected with the pressure relief area. When thermal runaway occurs in the battery, the pressure relief area is broken for pressure relief, and the pressure relief area and the shell can be disconnected, so that the battery is powered off. When the pressure relief area is broken, the pressure relief area can pull apart the tabs at the same time, so that the power failure of the battery is doubly determined. The method can doubly determine the power failure of the battery, thereby improving the safety performance of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to batteries and electrical equipment. Background Art

[0002] The top cover of the existing battery is composed of a top cover sheet, a positive pole, a negative pole, an upper plastic, a sealing ring, a lower plastic, an explosion-proof valve, and an explosion-proof valve protection patch. The internal pole ear of the battery is connected to the pole through an adapter, or the pole ear on the battery is directly connected to the pole. When the battery has thermal runaway, the explosion-proof valve will explode open to release pressure, but the battery is still in a closed loop working state, which is prone to fire and cause significant losses. Utility Model Content

[0003] In view of this, the present application provides a battery and an electrical device that can improve the safety performance of the battery.

[0004] In a first aspect, the present application provides a battery, comprising: a shell, on which at least one pressure relief zone is formed, and the pressure relief zone ruptures when the battery is in thermal runaway; and a tab assembly, comprising a plurality of tabs, at least one of which is electrically connected to the pressure relief zone. When the battery is in thermal runaway, the pressure relief zone ruptures and is disconnected from the shell, that is, part of the tab connected to the pressure relief zone is also disconnected from the shell, and the circuit is cut off.

[0005] In combination with the first aspect, in a possible implementation, the pressure relief area includes: a weak portion, the thickness of which is less than the thickness of the shell; and a connecting portion, which is used to electrically connect the tab. The weak portion is thinner than the thickness of the shell and is more likely to rupture when thermal runaway occurs.

[0006] In combination with the first aspect, in a possible implementation, the weak portion is arranged around at least a portion of the connecting portion. The weak portion may be arranged around the connecting portion partially or entirely, so that the connecting portion is located inside the weak portion, and when the weak portion is broken, the connecting portion is ensured to be disconnected from the housing.

[0007] In combination with the first aspect, in a possible implementation, the weak portion is closed around the entire connecting portion, ensuring that the pressure relief portion can be completely separated from the shell and the electrical connection can be disconnected when thermal runaway occurs.

[0008] In combination with the first aspect, in a possible implementation, the thickness of the connecting portion is greater than or equal to the thickness of the weak portion. The thickness of the connecting portion is not less than the thickness of the weak portion, thereby reducing the risk of insufficient connection strength between the connecting portion and the tab.

[0009] In combination with the first aspect, in a possible implementation, the tab and the connection portion are welded to each other, and the first geometric center of the weld mark coincides with the second geometric center of the connection portion. The first geometric center of the tab weld mark coincides with the second geometric center of the connection portion to avoid edge areas and ensure the stability of the connection structure.

[0010] In combination with the first aspect, in a possible implementation, a pole is further included, the pole lug includes a first pole lug and a second pole lug, the first pole lug is connected to the pressure relief area, the second pole lug is connected to the pole, and an insulating member is provided between the pole and the pressure relief portion.

[0011] In combination with the first aspect, in a possible implementation, a transition piece is further included, wherein the transition piece includes a pole tab connection portion and a pole post connection portion, wherein the pole tab connection portion is electrically connected to the second pole tab, and the pole post connection portion is electrically connected to the pole post.

[0012] In combination with the first aspect, in a possible implementation, the pressure relief zone includes a first pressure relief zone and a second pressure relief zone, the pole lug includes a first pole lug and a second pole lug, the first pole lug is electrically connected to the first pressure relief zone, the second pole lug is electrically connected to the second pressure relief zone, and an insulating member is provided between the first pressure relief zone and the second pressure relief zone to avoid short circuit.

[0013] In a second aspect, the present application provides an electrical device comprising any of the aforementioned batteries.

[0014] When the present application is used, at least one pole ear is electrically connected to the pressure relief zone, so that the shell is charged, and the shell is equivalent to a pole. When thermal runaway occurs inside the battery, the pressure relief zone ruptures to relieve pressure, and the connection between the pressure relief zone and the shell can be disconnected, so that the shell is no longer charged, thereby disconnecting the battery. When the pressure relief zone ruptures, the pressure relief zone can simultaneously tear off the pole ear connected to it, thereby doubly confirming that the battery is powered off. The present application can double-confirm that the battery is powered off, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of a battery provided in one embodiment of the present application.

[0016] Figure 2 Shown is an exploded view of a top cover structure of a battery provided in another embodiment of the present application.

[0017] Figure 3 Shown is a partial structural schematic diagram provided by an embodiment of the present application.

[0018] Figure 4 Shown is a partial structural schematic diagram provided by an embodiment of the present application.

[0019] Figure 5 Shown is a partial structural schematic diagram provided by an embodiment of the present application.

[0020] Figure 6 Shown Figure 5 An enlarged schematic diagram of part B. DETAILED DESCRIPTION

[0021] 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.

[0022] The following description is given to enable those skilled in the art to implement and use the utility model and incorporate it into specific application contexts. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the utility model is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0023] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0024] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0025] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention.

[0029] The top cover of the existing battery is composed of a top cover sheet, a positive pole, a negative pole, an upper plastic, a sealing ring, a lower plastic, an explosion-proof valve, and an explosion-proof valve protection patch. The tabs on the battery cells inside the battery are connected to the poles through adapters, or the tabs on the battery cells are directly connected to the poles. When the battery thermally runs away, the explosion-proof valve will explode open to release pressure, but the battery is still in a closed loop working state, which is prone to fire and causes significant losses.

[0030] In view of this, the present application provides a battery and an electrical device that can improve the safety performance of the battery.

[0031] An exemplary battery is as follows:

[0032] Figure 1 The figure shows a schematic diagram of the structure of a battery provided in one embodiment of the present application. The present application provides a battery, in one embodiment, such as Figure 1 As shown, the battery includes a shell 1 and a tab assembly. At least one pressure relief zone is formed on the shell 1, and the pressure relief zone ruptures when the battery thermally runs away. The tab assembly includes a plurality of tabs 4, and at least one tab 4 is electrically connected to the pressure relief zone. It should be noted that the plurality of tabs here include positive tabs and negative tabs, and one tab is all the positive tabs or negative tabs in the battery. Moreover, the shell 1 described in the present application is a cavity for accommodating a battery cell including a top cover.

[0033] When this embodiment is used, at least one pole ear 4 is electrically connected to the pressure relief zone, so that the shell 1 is charged, and the shell 1 is equivalent to a pole. When thermal runaway occurs inside the battery, the pressure relief zone ruptures to relieve pressure, and the connection between the pressure relief zone and the shell 1 can be disconnected, that is, the pole ear 4 is disconnected from the shell 1, so that the shell 1 is no longer charged, thereby disconnecting the battery. When the pressure relief zone ruptures, the pressure relief zone can tear the pole ear 4, causing the pole ear to break and disconnect from the internal battery cell, thereby doubly determining that the battery is powered off. This embodiment can double determine that the battery is powered off, thereby improving the safety performance of the battery.

[0034] Specifically, Figure 1 As shown, the pressure relief zone includes a weak portion 3 and a connecting portion 301, and the thickness of the weak portion 3 is less than the thickness of the shell 1. The connecting portion 301 is used to electrically connect the tab 4. When the pressure relief zone ruptures, due to the small thickness of the weak portion 3, a disconnection occurs at the location of the weak portion 3, and then the connecting portion 301 explodes and tears off the tab 4.

[0035] Figure 2 The figure shows an exploded view of a top cover structure of a battery provided by another embodiment of the present application. Among them, the pole ear 4 includes a first pole ear and a second pole ear, and the first pole ear and the second pole ear are pole ears of different polarities: if the first pole ear is a positive pole ear, the second pole ear is a negative pole ear; if the first pole ear is a negative pole ear, the second pole ear is a positive pole ear. In one embodiment, the first pole ear is connected to the connecting portion 301, and the second pole ear is connected to the pole column 2, forming a single pole column shape. Figure 1 Schematic diagram of the state when the top cover 7 is opened, Figure 1 The middle is the bottom of the top cover 7, the top cover 7 is connected to the top opening 101 of the shell 1, the shell 1 has a battery cell accommodating cavity, and the battery cell 6 is arranged in the battery cell accommodating cavity. Figure 2 The exploded diagram of the top cover 7 is shown in FIG. The top cover sheet 11 is provided with a mounting hole 12 for mounting the pressure relief zone 10. A protective patch 13 is provided around the pressure relief zone 10 to protect the pressure relief zone 12 and prevent external impurities from contaminating the pressure relief zone 10. A lower plastic 14 is provided on the side of the top cover sheet 11 facing the battery cell accommodating cavity to insulate the battery cell 6 from the top cover sheet 11. The top cover sheet 11 is provided with a pole hole 202 for mounting the pole 2, and a sealing ring 203 is provided to seal the gap between the pole 2 and the pole hole 202. An upper plastic 204 is provided above the pole 2 to fix the pole 2 from above and to insulate the pole 2 from the top cover sheet 11. Figure 2 In the embodiment, the top cover sheet 11 is provided with three holes, one hole is used for installing the pressure relief area 10 , one hole is used for installing the pole 2 , and one hole is used as the liquid injection hole 15 .

[0036] Figure 3 FIG. 1 is a schematic diagram of a part of the structure provided by an embodiment of the present application. In an embodiment, as Figure 3As shown, the weak portion 3 is closed around the entire connecting portion 301, that is, the weak portion 3 is a line pattern connected end to end to enclose the connecting portion 301. When the battery is thermally runaway, the closed weak portion 3 can make it easier for the connecting portion 301 to burst as a whole.

[0037] Figure 4 FIG. 1 is a schematic diagram of a part of the structure provided by an embodiment of the present application. In an embodiment, as Figure 4 As shown, the weak portion 3 is arranged around at least part of the connecting portion 301, and the weak portion 3 is in a non-closed line pattern to enclose the connecting portion 301, or the weak portion 3 is in a plurality of non-closed line patterns to enclose the connecting portion 301. When the battery is thermally runaway, the connecting portion 301 is disconnected along the weak portion 3, and at the same time, the weak portion 3 can tear and drive the unclosed portion to rupture, so that the connecting portion 301 is ruptured as a whole.

[0038] In one embodiment, the thickness of the connecting portion 301 is greater than or equal to the thickness of the weak portion 3, thereby ensuring that when the pressure relief zone ruptures, disconnection occurs at the weak portion 3, and ensuring the connection strength between the connecting portion 301 and the pole ear, thereby avoiding problems such as rupture and deformation when connecting to the pole ear due to the small thickness of the connecting portion 301.

[0039] In one embodiment, the pole lug 4 and the connecting portion 301 are welded to each other, and the first geometric center of the weld mark 401 coincides with the second geometric center of the connecting area 301. The coincidence can optimize the pulling force of the connecting portion 301 on the pole lug 4, making it easier for the connecting portion to break the pole lug 4, while avoiding the edge portions from being connected to each other, thereby ensuring the stability of the connecting structure.

[0040] In one embodiment, if Figure 2 As shown, the battery also includes a pole 2, and the pole lug 4 includes a first pole lug and a second pole lug, the first pole lug is connected to the pressure relief area, the second pole lug is connected to the pole 2, and an insulating member is provided between the pole 2 and the pressure relief portion. The structural form of this embodiment is a single pole form. In some embodiments, the battery is a lithium-ion battery, the shell 1 is an aluminum shell, only the positive pole lug can be connected to the shell 1, and the negative pole lug cannot be connected to the shell 1; batteries of other systems can make the negative pole lug electrically connected to the shell.

[0041] In one embodiment, if Figure 1 As shown, the battery further includes a converter 5 , which includes a pole tab connection portion and a pole post connection portion, the pole tab connection portion is electrically connected to the second pole tab, and the pole post connection portion is electrically connected to the pole post 2 .

[0042] In one embodiment, the pressure relief zone includes a first pressure relief zone and a second pressure relief zone, the pole ear 4 includes a first pole ear and a second pole ear, the first pole ear is electrically connected to the first pressure relief zone, the second pole ear is electrically connected to the second pressure relief zone, and an insulating member is arranged between the first pressure relief zone and the second pressure relief zone. This embodiment is a pole-free form, that is, two pressure relief zones are arranged on the shell 1, and the two pressure relief zones are electrically connected to the two pole ears respectively.

[0043] Figure 5 Shown is a partial structural schematic diagram provided by an embodiment of the present application. Figure 6 Shown Figure 5 The specific structural form of the weak portion 3 is a notch form, that is, a mark with a thickness less than the thickness of the shell 1 is engraved to form the weak portion 3. When the pressure relief zone ruptures, the notch is fractured.

[0044] Exemplary electrical equipment are as follows:

[0045] The present application provides an electrical device, which in one embodiment includes the aforementioned battery. When thermal runaway occurs inside the battery, the connection portion explodes to release pressure, so that the shell is no longer charged, thereby disconnecting the battery, and the connection portion can simultaneously tear off the pole ear connected thereto, thereby doubly confirming that the battery is disconnected, thereby improving the safety performance of the electrical device.

[0046] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0047] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0048] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0049] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of this utility model.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A shell (1), wherein at least one pressure relief area is formed on the shell (1), and the pressure relief area ruptures when the battery thermally runs away; as well as A pole lug assembly comprises a plurality of pole lugs (4), at least one of the pole lugs (4) being electrically connected to the pressure relief area.

2. The battery according to claim 1, characterized in that The pressure relief area includes: a weak portion (3), the thickness of the weak portion (3) being smaller than the thickness of the shell (1); and The connecting portion (301) is used for electrically connecting the electrode tab (4).

3. The battery according to claim 2, characterized in that The weak portion (3) is arranged around at least a portion of the connecting portion (301).

4. The battery according to claim 3, characterized in that The weak portion (3) is closed around the entire connecting portion (301).

5. The battery according to claim 2, characterized in that The thickness of the connecting portion (301) is greater than or equal to the thickness of the weak portion (3).

6. The battery according to claim 2, characterized in that The pole lug (4) and the connecting portion (301) are connected to each other by welding, and a first geometric center of the welding mark (401) coincides with a second geometric center of the connecting portion (301).

7. The battery according to any one of claims 1 to 6, characterized in that: It also includes a pole (2), the pole lug (4) including a first pole lug and a second pole lug, the first pole lug is connected to the pressure relief zone, the second pole lug is connected to the pole (2), and an insulating member is provided between the pole (2) and the pressure relief zone.

8. The battery according to claim 7, characterized in that It also comprises an adapter (5), the adapter (5) comprising a pole lug connection portion and a pole column connection portion, the pole lug connection portion being electrically connected to the second pole lug, and the pole column connection portion being electrically connected to the pole column (2).

9. The battery according to any one of claims 1 to 6, characterized in that: The pressure relief zone includes a first pressure relief zone and a second pressure relief zone, and the pole lug (4) includes a first pole lug and a second pole lug, the first pole lug is electrically connected to the first pressure relief zone, the second pole lug is electrically connected to the second pressure relief zone, and an insulating member is provided between the first pressure relief zone and the second pressure relief zone.

10. An electrical device, characterized in that: Comprising any one of the batteries described in claims 1-9.

Images