Lithium battery cover plate with active short circuit safety function and lithium battery

Abstract

This utility model discloses a lithium battery cover plate with active short-circuit safety function and a lithium battery. It relates to the field of new energy battery technology. Specifically, this application includes a cover plate body, an electrode post assembly disposed on the cover plate body, and a short-circuit triggering assembly disposed on the electrode post assembly. The electrode post assembly penetrates the cover plate body and extends to the inner side of the cover plate body. The short-circuit triggering assembly is disposed at one end of the electrode post assembly extending to the inner side of the cover plate body. During the thermal runaway process of the lithium battery, the short-circuit triggering assembly is triggered to deform, making the electrode post assembly conductive, thereby causing the lithium battery to actively short-circuit. This utility model can trigger the short-circuit triggering assembly to deform and make the electrode post assembly conductive when the lithium battery experiences thermal runaway, causing the lithium battery to actively short-circuit, changing passive pressure relief to active energy release, thus providing a more proactive and faster safety intervention mechanism. Furthermore, it has a simple structure and is easy to implement, thereby improving the safety performance of lithium batteries and reducing the manufacturing cost of lithium batteries.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a lithium battery cover plate with active short-circuit safety function and a lithium battery. Background Technology

[0002] With the widespread application of lithium batteries in electric vehicles, energy storage systems, and other fields, their safety issues are becoming increasingly prominent. Under abusive conditions (such as overcharging, short circuits, thermal shock, etc.), lithium batteries are prone to thermal runaway, which generates a large amount of heat and gas inside the battery casing, causing a sharp rise in gas pressure and temperature, posing a significant risk of fire and explosion.

[0003] Currently, conventional lithium battery covers typically include a positive terminal post, a negative terminal post, a lower plastic layer, an upper plastic layer, and an explosion-proof valve. Their safety mechanism primarily relies on the explosion-proof valve. When the internal pressure of the battery casing reaches a threshold set by the valve, it ruptures to release pressure. However, this protection method is passive and can only release pressure; it cannot handle the continuously generated heat. Sometimes, even after pressure release, the chemical reaction within the battery casing continues, potentially leading to secondary risks such as reignition.

[0004] Therefore, in order to further improve the safety performance of lithium batteries, it is urgent to design a lithium battery cover with a more proactive and faster safety intervention mechanism. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a lithium battery cover plate and lithium battery with active short-circuit safety function. This provides a more proactive and faster safety intervention mechanism when the lithium battery experiences thermal runaway. The structure is simple and easy to implement, thereby improving the safety performance of the lithium battery and reducing its manufacturing cost.

[0006] This utility model proposes a lithium battery cover with active short-circuit safety function, including a cover body, an electrode assembly disposed on the cover body, and a short-circuit triggering component disposed on the electrode assembly. The electrode assembly passes through the cover body and extends to the inner side of the cover body. The short-circuit triggering component is disposed at one end of the electrode assembly extending to the inner side of the cover body. During the thermal runaway process of the lithium battery, the short-circuit triggering component is triggered to deform, thereby conducting the electrode assembly to cause the lithium battery to actively short-circuit.

[0007] Furthermore, the electrode assembly includes a positive electrode and a negative electrode spaced apart on the cover plate body. The positive electrode leads out the positive electrode of the lithium battery, and the negative electrode leads out the negative electrode of the lithium battery. The short-circuit triggering component is located at one end of the positive electrode and / or the negative electrode extending to the inner side of the cover plate body. The short-circuit triggering component can conduct electricity between the positive electrode and the negative electrode after deformation.

[0008] Furthermore, the short-circuit triggering assembly includes a positive short-circuit triggering element disposed at one end of the positive terminal extending to the inner side of the cover plate body, and a negative short-circuit triggering element disposed at one end of the negative terminal extending to the inner side of the cover plate body. The positive short-circuit triggering element and the negative short-circuit triggering element can come into contact with each other after deformation to conduct electricity between the positive terminal and the negative terminal.

[0009] Furthermore, the positive short-circuit trigger includes a positive extension piece electrically connected to the positive terminal post. The positive extension piece is disposed at one end of the positive terminal post extending to the inner side of the cover plate body and extending toward the negative terminal post. The width of the positive extension piece is smaller than the diameter of the positive terminal post.

[0010] Furthermore, the positive short-circuit trigger also includes a positive protrusion disposed on the side of the positive extension piece near the negative short-circuit trigger, and the positive protrusion contacts the negative short-circuit trigger after the positive extension piece is deformed.

[0011] Furthermore, the negative short-circuit trigger includes a negative extension piece electrically connected to the negative terminal post. The negative extension piece is disposed at one end of the negative terminal post extending to the inner side of the cover plate body and extending toward the positive terminal post. The width of the negative extension piece is smaller than the diameter of the negative terminal post.

[0012] Furthermore, the negative short-circuit trigger also includes a negative protrusion located on the side of the negative extension piece near the positive short-circuit trigger. After the negative extension piece is deformed, the negative protrusion contacts the positive short-circuit trigger.

[0013] Furthermore, the projected portions of the positive electrode extension sheet and the negative electrode extension sheet overlap to form a short-circuit trigger area, which is used to make contact with each other after the positive electrode extension sheet and the negative electrode extension sheet are deformed.

[0014] Furthermore, the lithium battery cover also includes an explosion-proof valve disposed inside the cover body and a protective plate disposed outside the cover body. The explosion-proof valve provides explosion-proof protection for the lithium battery, and the protective plate protects the explosion-proof valve.

[0015] This utility model also provides a lithium battery, including the above-mentioned lithium battery cover with active short-circuit safety function.

[0016] The lithium battery cover plate and lithium battery with active short-circuit safety function proposed in this utility model have the following beneficial effects: (1) When the lithium battery generates thermal runaway, the two main precursor signals of this lithium battery cover can trigger the short circuit trigger component to deform, conduct the terminal component, and make the lithium battery actively short-circuit, changing the passive pressure relief to active energy release, thereby providing a more active and faster safety intervention mechanism. Moreover, the structure is simple and easy to implement, thereby improving the safety performance of the lithium battery and reducing the manufacturing cost of the lithium battery. (2) The lithium battery cover can be provided with a short circuit triggering component at one end of the positive terminal and the negative terminal extending to the inner side of the cover body, or a short circuit triggering component can be provided at one end of the positive terminal or the negative terminal extending to the inner side of the cover body, so that when the lithium battery causes thermal runaway, the short circuit triggering component is triggered to deform, and the positive terminal and the negative terminal are connected to make the lithium battery actively short-circuited; (3) The positive short-circuit trigger of this lithium battery cover includes a positive extension piece, which is electrically connected to the positive terminal post. The width of the positive extension piece is smaller than the diameter of the positive terminal post, thereby reducing the threshold for the positive extension piece to deform due to thermal runaway of the battery, making the response speed of the positive extension piece to deform faster, and thus providing a more proactive and faster safety intervention mechanism. (4) The positive electrode short circuit trigger of this lithium battery cover also includes a positive electrode bump. Due to the presence of the positive electrode bump, when the positive electrode extension sheet deforms, the stress is concentrated at the positive electrode bump. Therefore, the deformation of the positive electrode extension sheet occurs preferentially at the positive electrode bump, so that the positive electrode bump and the negative electrode short circuit trigger come into contact with each other, conduct the positive electrode post and the negative electrode post, and make the lithium battery actively short circuit, thereby providing a more active and faster safety intervention mechanism. (5) The negative electrode short circuit trigger of this lithium battery cover includes a negative electrode extension piece, which is electrically connected to the negative electrode post. The width of the negative electrode extension piece is smaller than the diameter of the negative electrode post, thereby reducing the threshold for the negative electrode extension piece to deform due to battery thermal runaway, making the response speed of the negative electrode extension piece to deform faster, and thus providing a more proactive and faster safety intervention mechanism. (6) The negative electrode short circuit trigger of this lithium battery cover also includes a negative electrode bump. Due to the presence of the negative electrode bump, when the negative electrode extension piece deforms, the stress is concentrated at the negative electrode bump. Therefore, the deformation of the negative electrode extension piece occurs preferentially at the negative electrode bump, so that the negative electrode bump and the positive electrode short circuit trigger come into contact with each other, conduct the positive electrode post and the negative electrode post, and make the lithium battery actively short circuit, thereby providing a more active and faster safety intervention mechanism. (7) The lithium battery cover plate is connected by the positive electrode bump and the negative electrode bump. On the one hand, it can shorten the deformation stroke of the positive electrode short circuit trigger and the negative electrode short circuit trigger, and lower the action threshold of the positive electrode short circuit trigger and the negative electrode short circuit trigger, thereby providing a more proactive and faster safety intervention mechanism. On the other hand, the point contact avoids the contact problems that may be caused by the deformation mismatch of the planar contact, ensuring lower contact resistance and more significant short circuit effect, thereby improving the reliability of the contact. (8) This lithium battery cover plate only adds two stamped metal extension pieces and protrusions to the existing lithium battery cover plate structure, without the need for complex electronic control components or additional activation devices, thus making the lithium battery cover plate structure simple and easy to implement, reducing the manufacturing cost of lithium batteries. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements.

[0018] Figure 1 A side view of a lithium battery cover with active short-circuit safety function and a lithium battery according to an embodiment of the present invention. Figure 2 This is a top view of a lithium battery cover with active short-circuit safety function and a lithium battery according to an embodiment of the present invention. Figure 3 This is a bottom view of a lithium battery cover with active short-circuit safety function and a lithium battery, according to an embodiment of the present invention.

[0019] In the diagram: 1. Cover plate body; 2. Positive terminal; 3. Negative terminal; 4. Positive extension plate; 5. Positive protrusion; 6. Negative extension plate; 7. Negative protrusion; 8. Short circuit trigger area; 9. Explosion-proof valve; 10. Protective plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Please see Figures 1-3A lithium battery cover with active short-circuit safety function according to an embodiment of the present invention includes a cover body 1, an electrode assembly disposed on the cover body 1, and a short-circuit triggering assembly disposed on the electrode assembly. The electrode assembly passes through the cover body 1 and extends to the inner side of the cover body 1. The short-circuit triggering assembly is disposed at one end of the electrode assembly extending to the inner side of the cover body 1. During the process of thermal runaway of the lithium battery, the short-circuit triggering assembly is triggered to deform, thereby conducting the electrode assembly to cause the lithium battery to actively short-circuit.

[0022] In this application, the lithium battery cover includes a cover body 1, an electrode assembly, and a short-circuit triggering assembly. The electrode assembly is disposed on the cover body 1 and extends from the outside of the cover body 1 through the cover body 1 to the inside of the cover body 1. The positive and negative electrodes of the lithium battery are led out through the electrode assembly, and then electrically connected to external electrical equipment through the electrode assembly to realize the charging and discharging function of the lithium battery.

[0023] Since the cover body 1 is used to close the opening of the battery casing, in this application, the side of the cover body 1 closest to the battery casing is considered the inner side, and the side of the cover body 1 furthest from the battery casing is considered the outer side. The terms "outer side" and "inner side" used throughout this application refer to this. The short-circuit triggering component is located at the end of the terminal post assembly that extends to the inner side of the cover body 1. When the cover body 1 closes the opening of the battery casing, the short-circuit triggering component is located inside the battery casing.

[0024] When a lithium battery experiences thermal runaway, there are two main warning signs: one is overcurrent heating, which occurs when the battery experiences an external short circuit or severe overcharging, causing a sudden increase in current. The huge current flowing through the terminal assembly generates significant Joule heat. The other is gas pressure generation, which occurs when the battery experiences thermal runaway, causing a large amount of gas to be generated inside the battery casing, leading to an increase in gas pressure inside the battery casing.

[0025] In this application, since the short-circuit trigger component is located on the terminal assembly and inside the battery casing, when the huge current flowing through the terminal assembly generates significant Joule heat, this heat causes the temperature of the short-circuit trigger component to rise sharply and undergo thermal deformation, thereby turning on the terminal assembly through the short-circuit trigger component and causing the lithium battery to actively short-circuit; when the air pressure inside the battery casing rises, the short-circuit trigger component undergoes mechanical deformation under the action of the air pressure inside the battery casing, thereby turning on the terminal assembly through the short-circuit trigger component and causing the lithium battery to actively short-circuit.

[0026] When the terminal assembly of a lithium battery is turned on, causing an active short circuit, the remaining electrical energy of the cell inside the battery casing is rapidly released to the outside in the form of Joule heat. This prevents energy from accumulating inside the battery casing and causing a more violent reaction. In turn, the electrical energy inside the cell is quickly discharged in the early stages of thermal runaway, fundamentally preventing the occurrence of catastrophic accidents.

[0027] Therefore, the lithium battery cover of this application can trigger the deformation of the short-circuit triggering component when the lithium battery experiences thermal runaway, thereby conducting the terminal component and actively short-circuiting the lithium battery, transforming passive pressure relief into active energy release. This provides a more proactive and faster safety intervention mechanism, and the structure is simple and easy to implement, thereby improving the safety performance of the lithium battery and reducing the manufacturing cost of the lithium battery.

[0028] Specifically, in this embodiment, the electrode assembly includes a positive electrode 2 and a negative electrode 3 spaced apart on the cover plate body 1. The positive electrode 2 leads out the positive electrode of the lithium battery, and the negative electrode 3 leads out the negative electrode of the lithium battery. A short-circuit triggering component is located at one end of the positive electrode 2 and / or the negative electrode 3 extending to the inner side of the cover plate body 1. The short-circuit triggering component can conduct the positive electrode 2 and the negative electrode 3 after deformation.

[0029] In this application, the electrode assembly includes a positive electrode 2 and a negative electrode 3, which are spaced apart on the cover plate body 1. Both the positive electrode 2 and the negative electrode 3 extend from the outside of the cover plate body 1 to the inside of the cover plate body 1.

[0030] The positive terminal 2 and the negative terminal 3 extend to one end inside the cover plate body 1 and are connected to the positive and negative terminals of the battery cell inside the battery casing via connecting pieces, respectively. Thus, the positive terminal of the battery cell is led out through the positive terminal 2 and the negative terminal 3 is led out through the negative terminal 3. Then, the positive terminal 2 and the negative terminal 3 are electrically connected to external electrical equipment through the end of the positive terminal 2 and the negative terminal 3 extending outside the cover plate body 1, so as to realize the charging and discharging function of the lithium battery.

[0031] In this application, a short-circuit triggering component can be provided at one end of the positive electrode post 2 and the negative electrode post 3 extending into the inner side of the cover plate body 1. Alternatively, a short-circuit triggering component can be provided at one end of the positive electrode post 2 or the negative electrode post 3 extending into the inner side of the cover plate body 1. In the event of thermal runaway of the lithium battery, the short-circuit triggering component will deform, connecting the positive electrode post 2 and the negative electrode post 3, thereby causing the lithium battery to actively short-circuit. This allows the remaining electrical energy of the cell inside the battery casing to be rapidly released to the outside in the form of Joule heat through the positive electrode post 2 and the negative electrode post 3, preventing energy from accumulating inside the battery casing and causing a more violent reaction.

[0032] In this embodiment, the short-circuit triggering component includes a positive short-circuit triggering element disposed at one end of the positive terminal 2 extending to the inner side of the cover plate body 1, and a negative short-circuit triggering element disposed at one end of the negative terminal 3 extending to the inner side of the cover plate body 1. The positive short-circuit triggering element and the negative short-circuit triggering element can come into contact with each other after deformation to conduct the positive terminal 2 and the negative terminal 3.

[0033] In this application, preferably, a short-circuit triggering component is provided at one end of the positive terminal 2 and the negative terminal 3 extending into the inner side of the cover plate. Specifically, the short-circuit triggering component includes a positive short-circuit trigger and a negative short-circuit trigger, wherein the positive short-circuit trigger is provided at one end of the positive terminal 2 extending into the inner side of the cover plate body 1, and the negative short-circuit trigger is provided at one end of the negative terminal 3 extending into the inner side of the cover plate body 1, so that when the cover plate body 1 closes the opening of the battery casing, both the positive and negative short-circuit triggers are located inside the battery casing.

[0034] When a lithium battery experiences thermal runaway, its two main precursor signals can trigger deformation of the positive and negative short-circuit triggers, causing them to come into contact with each other. This connects the positive terminal 2 and the negative terminal 3, enabling the lithium battery to actively short-circuit, thus providing a more proactive and faster safety intervention mechanism. Furthermore, this mechanism is simple in structure, easy to implement, improves the safety performance of lithium batteries, and reduces their manufacturing costs.

[0035] Specifically, in this embodiment, the positive short-circuit trigger includes a positive extension piece 4 electrically connected to the positive terminal 2. The positive extension piece 4 is located at one end of the positive terminal 2 that extends to the inner side of the cover plate body 1 and extends toward the negative terminal 3. The width of the positive extension piece 4 is smaller than the diameter of the positive terminal 2.

[0036] In this application, the positive electrode short-circuit trigger includes a positive electrode extension piece 4, which is disposed at one end of the positive electrode post 2 extending to the inner side of the cover plate body 1 and is electrically connected to the positive electrode post 2. Thus, when the battery experiences thermal runaway, the positive electrode extension piece 4 can undergo thermal deformation under the Joule heat generated when the positive electrode post 2 is overcurrent, and undergo mechanical deformation under the gas pressure of the battery casing.

[0037] Because the positive electrode extension piece 4 extends towards the negative electrode post 3, and the width of the positive electrode extension piece 4 is smaller than the diameter of the positive electrode post 2, the threshold for triggering deformation of the positive electrode extension piece 4 due to battery thermal runaway is reduced, resulting in a faster response speed for deformation of the positive electrode extension piece 4. The deformed positive electrode extension piece 4 comes into contact with the negative electrode short-circuit trigger, connecting the positive electrode post 2 and the negative electrode post 3, causing the lithium battery to actively short-circuit, thereby providing a more proactive and faster safety intervention mechanism.

[0038] Furthermore, in this embodiment, the positive short-circuit trigger also includes a positive protrusion 5 disposed on the side of the positive extension piece 4 near the negative short-circuit trigger. After the positive extension piece 4 is deformed, the positive protrusion 5 contacts the negative short-circuit trigger.

[0039] In this application, the positive electrode short-circuit trigger also includes a positive electrode bump 5, which is disposed on the side of the positive electrode extension piece 4 near the negative electrode short-circuit trigger. Due to the presence of the positive electrode bump 5, when the positive electrode extension piece 4 deforms, the stress is concentrated at the positive electrode bump 5. Therefore, the deformation of the positive electrode extension piece 4 preferentially occurs at the positive electrode bump 5, thereby making the positive electrode bump 5 contact the negative electrode short-circuit trigger, connecting the positive electrode post 2 and the negative electrode post 3, causing the lithium battery to actively short-circuit, thus providing a more proactive and faster safety intervention mechanism. Moreover, the structure is simple and easy to implement, improving the safety performance of the lithium battery and reducing the manufacturing cost of the lithium battery.

[0040] Specifically, in this embodiment, the negative short-circuit trigger includes a negative extension piece 6 electrically connected to the negative terminal post 3. The negative extension piece 6 is located at one end of the negative terminal post 3 that extends to the inner side of the cover plate body 1 and extends toward the positive terminal post 2. The width of the negative extension piece 6 is smaller than the diameter of the negative terminal post 3.

[0041] In this application, the negative electrode short-circuit trigger includes a negative electrode extension piece 6, which is disposed at one end of the negative electrode post 3 extending to the inner side of the cover plate body 1 and is electrically connected to the negative electrode post 3. Thus, when the battery experiences thermal runaway, the negative electrode extension piece 6 can undergo thermal deformation under the Joule heat generated when the negative electrode post 3 experiences overcurrent, and undergo mechanical deformation under the gas pressure of the battery casing.

[0042] Because the negative electrode extension piece 6 extends towards the positive electrode post 2, and the width of the negative electrode extension piece 6 is smaller than the diameter of the negative electrode post 3, the threshold for triggering deformation of the negative electrode extension piece 6 due to battery thermal runaway is reduced, resulting in a faster response speed for the negative electrode extension piece 6 to deform. The deformed negative electrode extension piece 6 comes into contact with the positive electrode short-circuit trigger, connecting the positive electrode post 2 and the negative electrode post 3, causing the lithium battery to actively short-circuit, thereby providing a more proactive and faster safety intervention mechanism.

[0043] Furthermore, in this embodiment, the negative short-circuit trigger also includes a negative protrusion 7 disposed on the side of the negative extension piece 6 near the positive short-circuit trigger. After the negative extension piece 6 is deformed, the negative protrusion 7 contacts the positive short-circuit trigger.

[0044] In this application, the negative electrode short-circuit trigger also includes a negative electrode bump 7, which is disposed on the side of the negative electrode extension piece 6 near the positive electrode short-circuit trigger. Due to the presence of the negative electrode bump 7, when the negative electrode extension piece 6 deforms, the stress is concentrated at the negative electrode bump 7. Therefore, the deformation of the negative electrode extension piece 6 preferentially occurs at the negative electrode bump 7, thereby making the negative electrode bump 7 contact the positive electrode short-circuit trigger, connecting the positive electrode post 2 and the negative electrode post 3, causing the lithium battery to actively short-circuit, thus providing a more proactive and faster safety intervention mechanism. Moreover, the structure is simple and easy to implement, improving the safety performance of the lithium battery and reducing the manufacturing cost of the lithium battery.

[0045] Specifically, in this application, since the positive electrode bump 5 and the negative electrode bump 7 are respectively disposed on the opposite sides of the positive electrode extension piece 4 and the negative electrode extension piece 6, the positive electrode bump 5 and the negative electrode bump 7 are disposed opposite to each other, and the deformation of the positive electrode extension piece 4 preferentially occurs at the positive electrode bump 5, and the deformation of the negative electrode extension piece 6 preferentially occurs at the negative electrode bump 7. Therefore, when the lithium battery experiences thermal runaway, the positive electrode bump 5 and the negative electrode bump 7 come into contact and overlap.

[0046] By connecting the positive protrusion 5 and the negative protrusion 7, the deformation stroke of the positive and negative short-circuit triggers can be shortened, and the action threshold of the positive and negative short-circuit triggers can be lowered, thus providing a more proactive and faster safety intervention mechanism. On the other hand, point contact avoids the contact problems that may be caused by mismatch in deformation due to planar contact, ensuring lower contact resistance, more significant short-circuit effect, and thus improving contact reliability.

[0047] In this embodiment, the projected portions of the positive electrode extension sheet 4 and the negative electrode extension sheet 6 overlap to form a short-circuit trigger area 8. This short-circuit trigger area 8 constitutes a physical path for the positive electrode extension sheet 4 and the negative electrode extension sheet 6 to come into contact with each other due to deformation, thereby creating a physical path for active short circuit in the lithium battery cover.

[0048] It is foreseeable that both the positive electrode protrusion 5 and the negative electrode protrusion 7 are located in the short-circuit trigger region 8. This means that when the positive electrode extension piece 4 and the negative electrode extension piece 6 deform, the positive electrode protrusion 5 and the negative electrode protrusion 7 located in the short-circuit trigger region 8 will contact and overlap, thereby reducing the deformation stroke of the positive electrode extension piece 4 and the negative electrode extension piece 6 and improving the reliability of the contact.

[0049] In practical implementation, the positive electrode extension piece 4 and the positive electrode bump 5 can be made of the same metal material as the positive electrode post 2 and integrally formed with the positive electrode post 2 by stamping; the negative electrode extension piece 6 and the negative electrode bump 7 can be made of the same metal material as the negative electrode post 3 and integrally formed with the negative electrode post 3 by stamping. Since this application only adds two stamped metal extension pieces and bumps to the existing lithium battery cover structure, no complex electronic control components or additional activation devices are required, thus simplifying the lithium battery cover structure, making it easy to implement, and reducing the manufacturing cost of lithium batteries.

[0050] In this embodiment, the lithium battery cover also includes an explosion-proof valve 9 disposed inside the cover body 1 and a protective plate 10 disposed outside the cover body 1. The explosion-proof valve 9 provides explosion-proof protection for the lithium battery, and the protective plate 10 protects the explosion-proof valve 9.

[0051] In this application, the lithium battery cover also includes an explosion-proof valve 9 and a protective sheet 10. When the battery experiences thermal runaway, a large amount of gas is generated inside the battery casing, causing the gas pressure inside the battery casing to rise. When the gas pressure inside the battery casing exceeds the set threshold of the explosion-proof valve 9, the explosion-proof valve 9 ruptures to release pressure. Thus, the explosion-proof valve 9, in conjunction with the short-circuit triggering component, provides safety protection for the lithium battery, further improving the safety performance of the lithium battery.

[0052] The protective plate 10 is installed on the outside of the explosion-proof valve 9 to protect the explosion-proof valve 9, prevent sharp objects from damaging the explosion-proof valve 9 and affecting its use, and also prevent foreign objects, dust and other objects from falling into the explosion-proof valve 9 and affecting its use, thereby improving the safety performance and practicality of this lithium battery cover.

[0053] This utility model embodiment also provides a lithium battery, including the above-mentioned lithium battery cover with active short-circuit safety function.

[0054] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery cover plate with active short circuit safety function, characterized in that: The device includes a cover plate body (1), an electrode assembly disposed on the cover plate body (1), and a short-circuit triggering assembly disposed on the electrode assembly. The electrode assembly passes through the cover plate body (1) and extends to the inside of the cover plate body (1). The short-circuit triggering assembly is disposed at one end of the electrode assembly that extends to the inside of the cover plate body (1). During the thermal runaway of the lithium battery, the short-circuit triggering assembly is triggered to deform and conduct the electrode assembly, so that the lithium battery is actively short-circuited.

2. A lithium battery cover with active short-circuit safety function as described in claim 1, characterized in that: The electrode assembly includes a positive electrode post (2) and a negative electrode post (3) spaced apart on the cover plate body (1). The positive electrode post (2) leads out the positive electrode of the lithium battery, and the negative electrode post (3) leads out the negative electrode of the lithium battery. The short-circuit triggering component is located at one end of the positive electrode post (2) and / or the negative electrode post (3) extending to the inner side of the cover plate body (1). After the short-circuit triggering component deforms, it connects the positive electrode post (2) and the negative electrode post (3).

3. The lithium battery cover plate with active short circuit safety function as claimed in claim 2, characterized in that: The short-circuit triggering assembly includes a positive short-circuit triggering element located at one end of the positive terminal (2) extending to the inner side of the cover plate body (1), and a negative short-circuit triggering element located at one end of the negative terminal (3) extending to the inner side of the cover plate body (1). The positive short-circuit triggering element and the negative short-circuit triggering element can come into contact with each other after deformation to conduct electricity between the positive terminal (2) and the negative terminal (3).

4. The lithium battery cover plate with active short circuit safety function as claimed in claim 3, characterized in that: The positive short-circuit trigger includes a positive extension piece (4) electrically connected to the positive terminal post (2). The positive extension piece (4) is located at one end of the positive terminal post (2) extending to the inner side of the cover plate body (1) and extending toward the negative terminal post (3). The width of the positive extension piece (4) is smaller than the diameter of the positive terminal post (2).

5. The lithium battery cover plate with active short circuit safety function as claimed in claim 4, characterized in that: The positive short-circuit trigger also includes a positive protrusion (5) located on the side of the positive extension piece (4) near the negative short-circuit trigger. After the positive extension piece (4) is deformed, the positive protrusion (5) contacts the negative short-circuit trigger.

6. A lithium battery cover with active short-circuit safety function as described in claim 4, characterized in that: The negative short-circuit trigger includes a negative extension piece (6) electrically connected to the negative terminal post (3). The negative extension piece (6) is located at one end of the negative terminal post (3) extending to the inner side of the cover plate body (1) and extending toward the positive terminal post (2). The width of the negative extension piece (6) is smaller than the diameter of the negative terminal post (3).

7. A lithium battery cover plate with active short circuit safety function as claimed in claim 6, characterized in that: The negative short-circuit trigger also includes a negative protrusion (7) located on the side of the negative extension piece (6) near the positive short-circuit trigger. After the negative extension piece (6) is deformed, the negative protrusion (7) contacts the positive short-circuit trigger.

8. The lithium battery cover plate with active short circuit safety function as claimed in claim 7, characterized in that: The projection portions of the positive electrode extension piece (4) and the negative electrode extension piece (6) overlap to form a short-circuit trigger area (8). The short-circuit trigger area (8) is used to make contact with each other after the positive electrode extension piece (4) and the negative electrode extension piece (6) are deformed.

9. The lithium battery cover plate with active short circuit safety function as claimed in claim 1, characterized in that: The lithium battery cover also includes an explosion-proof valve (9) disposed inside the cover body (1) and a protective plate (10) disposed outside the cover body (1). The explosion-proof valve (9) provides explosion-proof protection for the lithium battery, and the protective plate (10) protects the explosion-proof valve (9).

10. A lithium battery, characterized by, A lithium battery cover with active short-circuit safety function as described in any one of claims 1-9.

Images