Battery protection device, cover assembly and battery

Abstract

The present invention provides a battery protection device, a cover plate assembly and a battery. The battery protection device includes a cover plate body and a temperature memory element. The cover plate body is provided with a vent hole. The temperature memory element is electrically connected to the cover plate body and seals the vent hole. The temperature memory element has a low-temperature memory state disconnected from the first electrode terminal and a high-temperature memory state connected to the first electrode terminal. The temperature memory element can be deformed from the low-temperature memory state to the high-temperature memory state when the internal temperature of the battery is higher than a preset temperature control threshold. The battery protection device of the present invention forms a short circuit between the first electrode terminal and the second electrode terminal when the internal temperature of the battery exceeds the preset temperature threshold of the temperature memory element, and the residual energy of the battery is consumed by the impedance of the cover plate body and the temperature memory element, thereby minimizing the risk of battery fire or explosion.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery safety protection, and in particular relates to a battery protection device, a cover plate assembly and a battery. Background Art

[0002] At present, most batteries do not have a safety protection structure on their covers, and the covers are only used to support the poles. When the battery is subjected to abuse conditions such as impact, puncture by foreign objects, or overheating, a series of complex electrochemical reactions will occur inside the battery. When these abnormalities are not effectively controlled and the battery experiences thermal runaway, the battery will be at risk of fire or even explosion.

[0003] Prior art TW093118829 discloses a battery protection device, the battery having at least two conductive terminals and at least one conductive lead, the conductive lead is in contact with the conductive terminal to connect the circuit. The battery protection device includes at least one circuit breaker unit, when the ambient temperature is higher than a predetermined temperature, the circuit breaker unit is deformed and the conductive lead is separated from the conductive terminal to cut off the circuit. When the battery has thermal runaway, the battery protection device can separate the conductive lead from the conductive terminal to cut off the circuit by deforming the circuit breaker unit to protect the battery.

[0004] However, the above-mentioned battery protection device only cuts off the circuit when the battery has thermal runaway. When the circuit is cut off, since the battery power has not decreased, complex electrochemical reactions are often still taking place inside the battery. Therefore, the risk of battery fire or even explosion is still relatively high. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a battery protection device for the existing battery protection device which uses circuit cutting to protect the battery. When the battery thermal runaway occurs and the circuit is cut off, the battery power is not reduced, resulting in a high risk of battery fire or even explosion.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A battery protection device is provided. The battery has a first electrode terminal and a second electrode terminal, one of the first electrode terminal and the second electrode terminal is a positive electrode terminal, and the other is a negative electrode terminal. The battery protection device includes a cover body and a temperature memory element. The cover body is provided with a vent hole. The temperature memory element is electrically connected to the cover body and seals the vent hole. The temperature memory element has a low-temperature memory form disconnected from the first electrode terminal and a high-temperature memory form connected to the first electrode terminal. The temperature memory element can be deformed from the low-temperature memory form to the high-temperature memory form when the internal temperature of the battery is higher than a preset temperature control threshold.

[0008] Further, the first electrode terminal is a negative terminal, and the second electrode terminal is a positive terminal.

[0009] Further, the temperature memory element is a shape memory alloy or a bimetallic strip.

[0010] Further, the value range of the preset temperature control threshold is 80 - 250 °C.

[0011] Further, the battery protection device further includes a short - circuit resistor electrically connected between the cover body and the second electrode terminal.

[0012] Further, the resistance value R of the short - circuit resistor has a value range of:

[0013] 1 / (2Ic) < R < 5 / Ic, where Ic represents the numerical value of the charging current of the battery.

[0014] According to the battery protection device of the present invention, the temperature memory element is electrically connected to the cover body and seals the vent hole. The temperature memory element has a low - temperature memory form in which it is disconnected from the first electrode terminal of the battery and a high - temperature memory form in which it is conductive to the first electrode terminal. When the internal temperature of the battery exceeds the preset temperature threshold of the temperature memory element, the temperature memory element deforms according to the "memory" to the pre - processed high - temperature memory form, and the temperature memory element is conductive to the first electrode terminal. Thus, the first electrode terminal, the cover body, and the second electrode terminal are conducted, and further a short - circuit is formed between the first electrode terminal and the second electrode terminal, realizing an internal short - circuit of the battery. Furthermore, an external abnormal circuit can be cut off, isolating the battery to prevent greater potential safety hazards and prevent chain hazards caused by abnormal batteries. So that the entire abnormality starts and ends with the abnormal battery, minimizing the risk brought by battery abuse. And when a short - circuit occurs, the impedance of structures such as the cover body and the temperature memory element consumes the residual energy of the battery, minimizing the risk of battery fire or explosion to the greatest extent.

[0015] In addition, the present invention also provides a cover assembly, including a first electrode terminal, a second electrode terminal, a first insulation sealing structure for insulating and sealing between the first electrode terminal and the cover body, a second sealing structure for sealing between the second electrode terminal and the cover body, and the above - mentioned battery protection device. The cover body is provided with a first through - hole and a second through - hole, and the first electrode terminal and the second electrode terminal are respectively inserted into the first through - hole and the second through - hole.

[0016] Further, the cover assembly further includes a first external lead - out piece connected to the outer end of the first electrode terminal. The temperature memory element is disconnected from the first external lead - out piece in the low - temperature memory form and is in contact and conductive with the first external lead - out piece in the high - temperature memory form.

[0017] Furthermore, the cap plate assembly further includes a short-circuit resistor and a second external lead-out piece connected to an outer end of the second electrode terminal, and the short-circuit resistor is electrically connected between the cap plate body and the second external lead-out piece.

[0018] Furthermore, a metal coating is provided on a surface of one side of the temperature memory element facing the contact sheet.

[0019] Furthermore, the temperature memory element is provided with a non-metallic protective coating on the surface other than the metal plating layer.

[0020] Furthermore, the first insulating sealing structure includes a first insulating ring, a first disc and a first insulating seal which are sequentially sleeved on the first electrode terminal from the outside to the inside, the first insulating ring is fixed on the first electrode terminal, the inner edge of the first disc is arranged between the first insulating seal and the first insulating ring, the outer edge of the first disc is arranged between the first insulating seal and the cover body, the first insulating seal is connected between the cover body and the first inner lead-out piece, and the first inner lead-out piece is fixed to the inner side end of the first electrode terminal.

[0021] Furthermore, the second sealing structure includes a second insulating ring, a second disc and a second insulating seal which are sequentially sleeved on the second electrode terminal from the outside to the inside, the second insulating ring is fixed on the second electrode terminal, the inner edge of the second disc is arranged between the second insulating seal and the second insulating ring, the outer edge of the second disc is arranged between the second insulating seal and the cover body, the second insulating seal is connected between the cover body and the second inner lead-out piece, and the second inner lead-out piece is fixed to the inner end of the second electrode terminal.

[0022] In addition, the present invention also provides a battery, which includes the above-mentioned cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a cover plate assembly provided by an embodiment of the present invention;

[0024] Figure 2 This is the normal working state of the battery protection device provided by one embodiment of the present invention (the memory alloy is in a low-temperature memory state);

[0025] Figure 3 It is a short-circuit state of the battery protection device provided by an embodiment of the present invention (the memory alloy is in a high-temperature memory state);

[0026] Figure 4 It is a partial enlarged view of the second electrode terminal of the cover plate assembly provided by one embodiment of the present invention.

[0027] The reference numerals in the specification are as follows:

[0028] 1. Cover plate body; 101. First through hole; 102. Second through hole; 103. Air vent; 104. Liquid injection hole; 2. First electrode terminal; 201. First buffer ring; 3. First inner lead sheet; 4. First outer lead sheet; 401. Contact sheet; 5. Second electrode terminal; 501. Second buffer ring; 6. Second inner lead sheet; 7. Second outer lead sheet; 8. Memory alloy; 9. Short-circuit resistor; 10. First insulating sealing structure; 11. Second sealing structure; 12. Explosion-proof valve; 13. Liquid injection hole protection structure; 14. First insulating ring; 15. First disc; 16. First insulating seal; 17. First welding protection sheet; 18. Second insulating ring; 19. Second disc; 20. Second insulating seal; 21. Second welding protection sheet. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figure 1 As shown, a cap assembly provided by an embodiment of the present invention includes a cap body 1, a first electrode terminal 2, a first inner lead sheet 3, a first outer lead sheet 4, a second electrode terminal 5, a second inner lead sheet 6, a second outer lead sheet 7, a memory alloy 8, a short-circuit resistor 9, a first insulating sealing structure 10 for insulating and sealing between the first electrode terminal 2 and the cap body 1, and a second sealing structure 11 for sealing between the second electrode terminal 5 and the cap body 1. The cap body 1, the memory alloy 8 and the short-circuit resistor 9 constitute a battery protection device. The short-circuit resistor 9 is electrically connected between the cap body 1 and the second outer lead sheet 7.

[0031] In this embodiment, the resistance R of the short-circuit resistor 8 has a value range of:

[0032] 1 / (2Ic) <R<5 / Ic (1);

[0033] Wherein, Ic represents the value of the charging current of the battery. The unit of the charging current Ic is at the same level as the unit of the resistance value R, that is, if the unit of Ic is ampere, the unit of the resistance value R of the short-circuit resistor is ohm; if the unit of Ic is milliampere, the unit of the resistance value R of the short-circuit resistor is milliohm. In formula (1), Ic only represents the numerical value. The preferred range of the resistance value R of the short-circuit resistor in formula (1) is designed according to different charging power sources, so that the excessive Joule heat generated by the short-circuit resistor can be reduced.

[0034] In this embodiment, the temperature memory element is a memory alloy 8. Figure 1 As shown, the cover plate body 1 is provided with a first through hole 101 and a second through hole 102, the first electrode terminal 2 and the second electrode terminal 5 are respectively inserted into the first through hole 101 and the second through hole 102, the first inner lead-out piece 3 and the second inner lead-out piece 6 are respectively welded to the inner ends of the first electrode terminal 2 and the second electrode terminal 5, and the first outer lead-out piece 4 and the second outer lead-out piece 7 are respectively welded to the outer ends of the first electrode terminal 2 and the second electrode terminal 5.

[0035] like Figure 1 and Figure 2 As shown, the cover body 1 is provided with a vent hole 103, and the memory alloy 8 is fixed to the edge of the vent hole 103 by welding or riveting and seals the vent hole 103. Under the condition of ensuring the connection strength, the connection area between the memory alloy 8 and the cover body 1 should be as small as possible. The end of the first external lead-out piece 4 away from the first electrode terminal 2 is bent toward the cover body 1 to form a contact piece 401 facing the temperature memory element. Since the contact piece 401 is formed by bending the first external lead-out piece 4 toward the cover body 1, the contact piece 401 is closer to the memory alloy 8, thus reducing the deformation of the memory alloy 8 when the memory alloy 8 and the contact piece 401 are disconnected and contacted.

[0036] In this embodiment, the memory alloy 8 has a low temperature memory state disconnected from the first electrode terminal 2 ( Figure 2 The state shown) and the high temperature memory state connected to the first electrode terminal 2 ( Figure 3 The shape shown), the memory alloy 8 Figure 2 The low temperature memory shape shown is disconnected from the first external lead sheet 4 and Figure 3 The high temperature memory shape shown is in contact with the contact piece 401 of the first external lead-out piece 4. The memory alloy 8 can be turned on when the internal temperature of the battery is higher than the preset temperature control threshold. Figure 2 The cryo-memory shape shown is deformed to Figure 3 High temperature memory shape shown.

[0037] In this embodiment, the memory alloy 8 is preferably a two-way memory alloy. Of course, in other embodiments, it can also be a one-way memory alloy or a full-way memory alloy. The memory alloy can be, but is not limited to, a Cu-based, Ni-based or Fe-based memory alloy.

[0038] In this embodiment, the preset temperature control threshold value ranges from 80 to 250°C. A further preferred range is 80 to 150°C. That is, when the battery undergoes thermal runaway and the internal temperature rises rapidly to a value between 80 and 250°C, the memory alloy 8 is Figure 2The cryo-memory shape shown is deformed to Figure 3 In the high-temperature memory form shown, the first electrode terminal 2 is connected to the cover body 1 through the contact between the contact piece 401 of the first external lead-out piece 4 and the memory alloy 8, and since the short-circuit resistor 9 is electrically connected between the cover body 1 and the second external lead-out piece 7, at this time, the first electrode terminal 2 and the second electrode terminal 5 are short-circuited.

[0039] In this embodiment, Figure 1 As shown, the cover body 1 is further provided with a liquid injection hole 104 and an explosion-proof valve 12 , and a liquid injection hole protection structure 13 is provided outside the liquid injection hole 104 .

[0040] In this embodiment, in order to ensure that the first external lead-out sheet 4 is in good contact with the memory alloy 8 and the contact impedance is low enough, a metal plating layer is provided on the surface of the memory alloy 8 facing the contact sheet 401 of the first external lead-out sheet 4. The metal plating layer here includes but is not limited to materials with excellent electrical conductivity and stable chemical properties such as gold, silver and nickel. Silver plating is preferred here, since it can meet the low impedance requirement and can well control the product cost. The thickness of the metal plating layer is 5μm to 60μm, and more preferably 8 to 20μm.

[0041] In this embodiment, in order to prevent the active elements in the memory alloy 8 from participating in the electrochemical reaction, a non-metallic protective coating, such as PPS, PPO and fluorocarbon coating, is provided on the surface of the memory alloy 8 other than the metal plating. When the thickness of the non-metallic protective coating is less than 30 μm, the electrolyte inside the battery will penetrate due to the density of the non-metallic protective coating, which may cause local failure of the non-metallic protective coating. When the thickness of the non-metallic protective coating is too thick, it is easy for the memory alloy 8 to deform, resulting in cracks on the surface of the non-metallic protective coating, and the cost will also increase. Therefore, the thickness of the non-metallic protective coating is preferably 30-300 μm, and more preferably 50-150 μm.

[0042] In this embodiment, Figure 2As shown, the first insulating sealing structure 10 includes a first insulating ring 14, a first disc 15 and a first insulating seal 16 which are sequentially sleeved on the first electrode terminal 2 from the outside to the inside, the first insulating ring 14 is fixed on the first electrode terminal 2, the inner edge of the first disc 15 is arranged between the first insulating seal 16 and the first insulating ring 14, the outer edge of the first disc 15 is arranged between the first insulating seal 16 and the cover body 1, the first insulating seal 16 is connected between the cover body 1 and the first inner lead sheet 3, and the first inner lead sheet 3 is fixed to the inner side end of the first electrode terminal 2. A first buffer ring 201 is formed on the outer periphery of the outer end of the first electrode terminal 2, the first buffer ring 201 is welded to the first insulating ring 14, and the first buffer ring 201 can buffer the welding stress between the first electrode terminal 2 and the first insulating ring 14. In addition, a first welding protection sheet 17 is provided between the first insulating seal 16 and the first inner lead sheet 3 to protect the welding between the first electrode terminal 2 and the first inner lead sheet 3 and prevent the first inner lead sheet 3 from being damaged during welding. During specific assembly, the outer surface of the first insulating ring 14 is welded to the first buffer ring 201, the inner edge of the first disc 15 is welded to the inner surface of the first insulating ring 14, the outer edge of the first disc 15 is welded to the inner surface of the cover body 1, the first insulating seal 16 is inserted into the inner cavity of the first disc 15, the first inner lead sheet 3 is welded to the inner end of the first electrode terminal 2, and the first insulating seal 16 is supported thereby.

[0043] In this embodiment, the first insulating sealing structure 10 and the second sealing structure 11 adopt similar structures, that is, Figure 4As shown, the second sealing structure 11 includes a second insulating ring 18, a second disc 19 and a second insulating seal 20 which are sequentially sleeved on the second electrode terminal 5 from the outside to the inside, the second insulating ring 18 is fixed on the second electrode terminal 5, the inner edge of the second disc 19 is arranged between the second insulating seal 20 and the second insulating ring 18, the outer edge of the second disc 19 is arranged between the second insulating seal 20 and the cover body 1, the second insulating seal 20 is connected between the cover body 1 and the second inner lead-out piece 6, and the second inner lead-out piece 6 is fixed to the inner side end of the second electrode terminal 5. A second buffer ring 501 is formed on the outer periphery of the outer end of the second electrode terminal 5, the second buffer ring 501 is welded to the second insulating ring 18, and the second buffer ring 501 can buffer the welding stress between the second electrode terminal 2 and the second insulating ring 16. In addition, a second welding protection sheet 21 is provided between the second insulating seal 20 and the second inner lead sheet 6 to protect the welding between the second electrode terminal 5 and the second inner lead sheet 6 and prevent the second inner lead sheet 6 from being damaged during welding. During specific assembly, the outer surface of the second insulating ring 18 is welded to the second buffer ring 501, the inner edge of the second disc 19 is welded to the inner surface of the second insulating ring 18, the outer edge of the second disc 19 is welded to the inner surface of the cover body 1, the second insulating seal 20 is inserted into the inner cavity of the second disc 19, and the second inner lead sheet 6 is welded to the inner end of the second electrode terminal 5, thereby supporting the second insulating seal 20.

[0044] In this embodiment, the first insulating ring 14 and the second insulating ring 18 can be ceramic insulating rings. The first disc 15 and the second disc 19 are both annular metal discs to provide good support.

[0045] Of course, in other embodiments, the first insulating sealing structure 10 and the second sealing structure 11 may also adopt different structures, that is, the second sealing structure 11 may not provide insulation between the cover body 1 and the second electrode terminal 5. Of course, the first insulating sealing structure 10 and the second sealing structure 11 may also adopt other conventional structural forms.

[0046] In addition, preferably, in this embodiment, the first electrode terminal 2 is a negative terminal, and the second electrode terminal 5 is a positive terminal. Correspondingly, the first inner lead sheet 3 and the first outer lead sheet 4 are negative inner lead sheets and negative outer lead sheets, and the second inner lead sheet 6 and the second outer lead sheet 7 are positive inner lead sheets and positive outer lead sheets. In this way, the short-circuit resistor 9 is connected between the positive outer lead sheet and the cover body 1, and the memory alloy 8 is opposite to the negative outer lead sheet.

[0047] Of course, in other embodiments, the reverse setting can also be made, that is, the first electrode terminal 2 is the positive terminal and the second electrode terminal 5 is the negative terminal. Since the cover body 1 is connected to the battery shell, when the second electrode terminal is the negative terminal, the short-circuit resistor is connected between the negative electrode lead-out sheet and the cover body, thereby connecting the negative terminal to the shell, and lithium deposition will occur, resulting in a reduction in battery capacity. Therefore, in this embodiment, preferably, lithium deposition is avoided by other means.

[0048] The battery protection device of the above embodiment has the following principle:

[0049] When the battery is subjected to abuse conditions such as impact, puncture by foreign objects or overheating, the battery will thermally run away, and the internal temperature of the battery will rise as thermal runaway occurs. When the internal temperature exceeds the preset temperature threshold of the memory alloy 8, the metallographic structure of the memory alloy 8 changes, and according to the "memory", it deforms to the high-temperature memory form that has been pre-processed. Figure 3 In the form shown in the figure, the memory alloy 8 is in contact with the first external lead-out sheet 4 and is connected, thereby connecting the first electrode terminal 2, the first external lead-out sheet 4, the cover body 1, the short-circuit resistor 9, the second external lead-out sheet 7 and the second electrode terminal 5, and then forming a short circuit between the first electrode terminal 2 and the second electrode terminal 5, realizing an internal short circuit of the battery, and then cutting off the external abnormal circuit, isolating the battery, preventing greater safety hazards from occurring, and preventing chain hazards caused by abnormal batteries. The entire abnormality starts from the abnormal battery and ends with the abnormal battery, minimizing the risk of battery abuse. In addition, when a short circuit occurs, the impedance of the short-circuit resistor, the cover body and the memory alloy structure is used to consume the residual energy of the battery, minimizing the risk of battery fire or explosion.

[0050] In addition, in other embodiments, the shape memory alloy in the above embodiments may be replaced by a bimetallic strip or other element having a similar shape memory function.

[0051] In addition, in other embodiments, the short-circuit resistor may be eliminated, and the second electrode terminal or the second external lead sheet may be directly electrically connected to the cover body. Since the second electrode terminal and the cover body do not need to be insulated, in this embodiment, the second sealing structure may not include a second insulating ring.

[0052] In addition, the present invention also provides a battery, which includes a shell, a pole core and the above-mentioned cover plate assembly. The pole core is obtained by winding a positive electrode sheet, a separator and a negative electrode sheet. The cover plate assembly is inserted from the opening of the shell and fixed to the shell, and the electrolyte is injected into the closed space between the cover plate assembly and the shell through the injection hole on the cover plate assembly. The positive electrode sheet and the negative electrode sheet are provided with a positive electrode tab and a negative electrode tab.

[0053] If the first electrode terminal 2 is a positive electrode terminal, the first inner lead-out piece is connected to the positive electrode tab, and the second inner lead-out piece is connected to the negative electrode tab.

[0054] Conversely, if the first electrode terminal 2 is a negative electrode terminal, the first inner lead-out piece is connected to the negative electrode tab, and the second inner lead-out piece is connected to the positive electrode tab.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery protection device, the battery having a first electrode terminal and a second electrode terminal, one of the first electrode terminal and the second electrode terminal being a positive electrode terminal and the other being a negative electrode terminal, characterized in that: The battery protection device includes a cover plate body and a temperature memory element. The cover plate body is provided with a ventilation hole. The temperature memory element is electrically connected to the cover plate body and seals the ventilation hole. The temperature memory element has a low-temperature memory form in which it is disconnected from the first electrode terminal and a high-temperature memory form in which it is electrically connected to the first electrode terminal. The temperature memory element can deform from the low-temperature memory form to the high-temperature memory form when the internal temperature of the battery is higher than a preset temperature control threshold value. The outer end of the first electrode terminal is used to connect to a first external lead-out piece. The temperature memory element is disconnected from the first external lead-out piece in the low-temperature memory form and is in contact and electrically connected to the first external lead-out piece in the high-temperature memory form. One end of the first external lead-out piece away from the first electrode terminal is bent towards the cover plate body to form a contact piece facing the temperature memory element. A metal coating is provided on the surface of the temperature memory element facing the contact piece. The metal coating is used to contact the first external lead-out piece, and a non-metal protective coating is provided on the surface of the temperature memory element other than the metal coating.

2. The battery protection device according to claim 1, characterized in that: The first electrode terminal is a negative terminal, and the second electrode terminal is a positive terminal.

3. The battery protection device according to claim 1, characterized in that: The temperature memory element is a shape memory alloy or a bimetallic strip.

4. The battery protection device according to claim 1, characterized in that: The value range of the preset temperature control threshold value is 80 - 250 °C.

5. The battery protection device according to any one of claims 1 to 4, characterized in that: The battery protection device further includes a short-circuit resistor electrically connected between the cover plate body and the second electrode terminal.

6. The battery protection device according to claim 5, characterized in that: The resistance value R of the short-circuit resistor has a value range of: 1 / (2Ic) < R < 5 / Ic, where Ic represents the value of the charging current of the battery.

7. A cover plate assembly, characterized in that: It includes a first electrode terminal, a second electrode terminal, a first insulation sealing structure for insulating and sealing between the first electrode terminal and the cover plate body, a second sealing structure for sealing between the second electrode terminal and the cover plate body, and the battery protection device according to any one of claims 1 - 4. The cover plate body is provided with a first through hole and a second through hole. The first electrode terminal and the second electrode terminal are respectively inserted into the first through hole and the second through hole.

8. The cover plate assembly according to claim 7, characterized in that: The cover plate assembly further includes a first internal lead-out piece and a second internal lead-out piece. The first internal lead-out piece and the second internal lead-out piece are respectively connected to the inner ends of the first electrode terminal and the second electrode terminal.

9. The cover plate assembly according to claim 7, characterized in that: The cover plate assembly further includes a first external lead-out piece connected to the outer end of the first electrode terminal. The temperature memory element is disconnected from the first external lead-out piece in the low-temperature memory form and is in contact and electrically connected to the first external lead-out piece in the high-temperature memory form.

10. The cover plate assembly according to claim 7 or 9, characterized in that: The cover plate assembly further includes a short-circuit resistor and a second external lead-out piece connected to the outer end of the second electrode terminal. The short-circuit resistor is electrically connected between the cover plate body and the second external lead-out piece.

11. The cover plate assembly according to claim 9, characterized in that: The edge of the temperature memory element is fixed on the edge of the ventilation hole on the cover plate body.

12. The cover plate assembly according to claim 8, characterized in that: The first insulating sealing structure includes a first insulating ring, a first disc and a first insulating seal which are sequentially sleeved on the first electrode terminal from the outside to the inside, the first insulating ring is fixed on the first electrode terminal, the inner edge of the first disc is arranged between the first insulating seal and the first insulating ring, the outer edge of the first disc is arranged between the first insulating seal and the cover body, the first insulating seal is connected between the cover body and the first inner lead-out piece, and the first inner lead-out piece is fixed to the inner side end of the first electrode terminal.

13. The cover plate assembly according to claim 8, characterized in that: The second sealing structure includes a second insulating ring, a second disc and a second insulating seal which are sequentially sleeved on the second electrode terminal from the outside to the inside, the second insulating ring is fixed on the second electrode terminal, the inner edge of the second disc is arranged between the second insulating seal and the second insulating ring, the outer edge of the second disc is arranged between the second insulating seal and the cover body, the second insulating seal is connected between the cover body and the second inner lead-out piece, and the second inner lead-out piece is fixed to the inner side end of the second electrode terminal.

14. A battery, characterized in that: A cover plate assembly comprising any one of claims 7-13.

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