Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises an acquisition assembly and a top cover, the acquisition assembly is configured to be connected with an electrode assembly of the battery cell; the top cover is provided with a liquid injection hole and a trigger hole, and the trigger hole is configured to trigger the collection assembly to collect parameter information of the collection assembly; wherein the liquid injection hole and the trigger hole are arranged at an interval. The utility model aims to solve the technical problems that liquid injection is interfered and the production efficiency is influenced due to the fact that a liquid injection hole and a trigger hole coincide in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a cover plate subassembly and battery. BACKGROUND

[0002] In order to be able to conveniently pay attention to the internal temperature change and air pressure change situation of single battery cell in system in real time, now have research in the inside of battery cell and place information collection chip, can gather the air pressure and temperature in the inside of single battery cell, but the chip needs power supply equipment.

[0003] In the related art, the battery cell is used for self-power supply of the chip, which excludes the risk of failure of the button battery cell, but in order to ensure the safe production of the battery cell, in addition to the collection module, a trigger module is also needed, so that the trigger module is started after the assembly of the battery cell is completed, and the collection is started, so as to prevent the battery cell from being detected by Hi-pot in the early stage and breaking the collection module. The conventional trigger module switch is placed at the liquid injection hole and is triggered by a sealing welding pin, but it interferes with the liquid injection and formation, affecting the production of the battery cell. SUMMARY

[0004] Embodiments of the utility model provide a cover plate subassembly and battery, and aim to solve the technical problem that the liquid injection hole and the trigger hole coincide in the related art, causing interference to the liquid injection and affecting the production efficiency.

[0005] In a first aspect, embodiments of the utility model provide a cover plate subassembly applied to a battery cell, which comprises:

[0006] A collection component is configured to be connected to an electrode assembly of the battery cell.

[0007] A top cover is provided with a liquid injection hole and a trigger hole, and the trigger hole is configured to trigger the collection component to collect parameter information of the electrode assembly.

[0008] The liquid injection hole and the trigger hole are arranged at intervals.

[0009] Optionally, the cover plate subassembly further comprises a trigger component electrically connected to the collection component.

[0010] The trigger hole is configured to trigger the trigger component, so that the collection component collects the parameter information of the electrode assembly.

[0011] Optionally, the trigger component is opposite to the trigger hole; and / or,

[0012] The trigger component is installed on the top cover through the trigger hole.

[0013] Optionally, the trigger component further comprises a switch electrically connected to the collection component, so as to control the on-off of a collection loop in which the collection component is located.

[0014] Optionally, after the assembling of the battery cell is completed, the switch is in the closed state to turn on the collection loop in which the collection assembly is located.

[0015] Optionally, when the battery cell is in the assembling process, the switch is first in the open state and then in the closed state; or,

[0016] When the battery cell is in the assembling process, the switch is first in the closed state and then in the open state.

[0017] Optionally, the trigger hole has a first end close to the electrode assembly and a second end away from the electrode assembly, and the aperture of the trigger hole is gradually increased in the direction from the first end to the second end.

[0018] Optionally, the diameter of the first end is D1, and the diameter of the second end is D2, and 1.9≤D2 / D1≤2.5.

[0019] Optionally, the cover plate is provided with an explosion-proof valve, the explosion-proof valve has a first symmetry line extending along the width direction of the top cover, and the center of the circle in which the trigger hole is located is located on the first symmetry line.

[0020] Optionally, the shortest distance between the center of the circle in which the trigger hole is located and the center line of the explosion-proof valve is L, and 17mm≤L≤22mm.

[0021] In a second aspect, an embodiment of the utility model provides a battery cell, comprising the cover plate assembly. The cover plate assembly comprises:

[0022] a collection assembly configured to be connected with the electrode assembly of the battery cell;

[0023] a top cover provided with a liquid injection hole and a trigger hole, the trigger hole being configured to trigger the collection assembly to collect parameter information of the electrode assembly;

[0024] wherein the liquid injection hole and the trigger hole are arranged at intervals.

[0025] The embodiment of the utility model has the beneficial effects that:

[0026] In the technical scheme of the utility model, the cover plate assembly comprises a collecting assembly and a top cover, the collecting assembly is configured to be connected with the electrode assembly of the battery cell, the top cover is provided with a liquid injection hole and a trigger hole, the trigger hole is configured to trigger the collecting assembly to collect parameter information of the electrode assembly, and the liquid injection hole is arranged at intervals from the trigger hole. The liquid injection hole is configured to pass electrolyte, the trigger hole is configured to trigger the collecting assembly, the liquid injection hole and the trigger hole are arranged at intervals and do not interfere with each other, do not affect liquid injection, can ensure normal production of the battery cell, and the collecting assembly does not need to be additionally provided with a power supply device, thereby solving the technical problem that the liquid injection hole and the trigger hole coincide in the related art, causing interference with liquid injection and affecting production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0028] Figure 1 It is a perspective view of the cover plate assembly provided by the embodiment of the utility model;

[0029] Figure 2 It is Figure 1 the bottom view of the cover plate assembly in the embodiment;

[0030] Figure 3 It is Figure 2 the sectional view of A-A in the embodiment;

[0031] Figure 4 It is Figure 3 the enlarged view of B in the embodiment;

[0032] Figure 5 It is Figure 1 the exploded view of the cover plate assembly in the embodiment;

[0033] Figure 6 It is the structural diagram of an embodiment in which the battery cell is in the assembling process;

[0034] Figure 7 It is the structural diagram of another embodiment in which the battery cell is in the assembling process.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] Reference Name Reference Name 100 Cover assembly 3 Trigger assembly 1 Collection assembly 4 Switch 2 Top cover 5 Explosion-proof valve 21 Liquid injection hole 6 Positive pole post 22 Trigger hole 7 Negative pole post 221 First end 8 Fixing member 222 Second end 9 Colloid particle DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts under the premise that the creative efforts are not made, belong to the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings; and "inner" and "outer" refer to the contour of the device.

[0038] In the related art, the battery cell is used as a chip to realize self-power supply, which excludes the risk of failure of the button battery cell, but in order to ensure the safe production of the battery cell, in addition to the collection module, a trigger module is also needed, so that the trigger module is started after the battery cell is assembled, and the collection is started to prevent the battery cell from being detected by the Hi-pot in the early stage, and the collection module is broken down. The conventional trigger module switch is placed at the liquid injection hole, and is triggered by the sealing welding nail, but it interferes with the liquid injection and formation, and affects the production of the battery cell.

[0039] Therefore, the present application provides a cover plate assembly 100, Figures 1 to 7 The cover plate assembly 100 provided by the present application has the advantages of simple structure, automatic power supply of the collection assembly 1, and no interference with the production of the battery cell. The cover plate assembly 100 will be described in detail below with reference to the main drawings.

[0040] In a first aspect, the embodiments of the present application provide a cover plate assembly 100 applied to a battery cell, the cover plate assembly 100 comprising a collection assembly 1 and a top cover 2, the collection assembly 1 being configured to be connected with an electrode assembly of the battery cell; the top cover 2 is provided with a liquid injection hole 21 and a trigger hole 22, the trigger hole 22 being configured to trigger the collection assembly 1 to collect parameter information of the electrode assembly; wherein the liquid injection hole 21 and the trigger hole 22 are arranged at intervals.

[0041] In the technical scheme of the utility model, the cover plate assembly 100 comprises a collecting assembly 1 and a top cover 2, the collecting assembly 1 is configured to be connected with the electrode assembly of the battery cell; the top cover 2 is provided with a liquid injection hole 21 and a trigger hole 22, the trigger hole 22 is configured to trigger the collecting assembly 1 to collect the parameter information of the electrode assembly; wherein the liquid injection hole 21 is arranged at intervals with the trigger hole 22. The liquid injection hole 21 is configured to pass the electrolyte, the trigger hole 22 is configured to trigger the collecting assembly 1, the liquid injection hole 21 and the trigger hole 22 are arranged at intervals, and there is no interference between the two, which will not affect the liquid injection, can guarantee the normal production of the battery cell, and the collecting assembly 1 also does not need to be provided with an additional power supply device, thereby solving the technical problem that the liquid injection hole 21 and the trigger hole 22 coincide in the related art, causing interference to the liquid injection, and affecting the production efficiency.

[0042] In the embodiment, referring to Figure 1 , the cover plate assembly 100 is also provided with a positive pole 6 and a negative pole 7, the positive pole 6 and the negative pole 7 are oppositely arranged at two ends of the cover plate assembly 100, the positive pole 6 and the negative pole 7 are electrically connected with the electrode assembly, one end of the collecting assembly 1 is connected with the positive pole 6, and the other end of the collecting assembly 1 is connected with the negative pole 7, the collecting assembly 1 is powered by the battery cell, an additional power supply device is not needed for power supply, the structure is simpler, the number of parts is reduced, and the cost is reduced.

[0043] In some embodiments, in order to avoid that the collecting assembly 1 is ablated due to static electricity and the like in the assembling process, the cover plate assembly 100 further comprises a trigger assembly 3, the trigger assembly 3 is electrically connected with the collecting assembly 1, and it needs to be noted that the specific position of the trigger assembly 3 is not limited, and can be selected according to the actual situation. In some embodiments, the trigger assembly 3 is arranged between the collecting assembly 1 and the positive pole 6, and the trigger assembly 3 is used for electrically connecting the positive pole 6 and the collecting assembly 1 when being triggered. In some other embodiments, the trigger assembly 3 is arranged between the collecting assembly 1 and the negative pole 7, and the trigger assembly 3 is used for electrically connecting the negative pole 7 and the collecting assembly 1 when being triggered.

[0044] Further, referring to Figure 2 , in the embodiment, the trigger assembly 3 is arranged between the collecting assembly 1 and the negative pole 7, and the trigger assembly 3 is equivalent to the function of the switch 4, in the process of assembling the battery cell, the trigger assembly 3 is used for disconnecting the connection between the collecting assembly 1 and the negative pole 7, in the process of completing the assembly, the trigger assembly 3 is triggered, so that the collecting assembly 1 is connected with the negative pole 7, thereby making the collecting assembly 1 be powered, and the collecting assembly 1 is used for collecting the parameter information of the electrode assembly.

[0045] Further, in some embodiments, in order to protect the collecting assembly 1 and the triggering assembly 3, the collecting assembly 1 and the triggering assembly 3 are arranged on one side of the top cover 2 close to the electrode assembly, that is, the collecting assembly 1 is arranged between the electrode assembly and the top cover 2, the triggering hole 22 is configured to trigger the triggering assembly 3, and after the completion of the assembly of the battery cell, the triggering assembly 3 is operated through the triggering hole 22, so that the collecting assembly 1 is in communication with the positive electrode post 6 and the negative electrode post 7, and the collecting assembly 1 collects the parameter information of the electrode assembly.

[0046] It should be noted that the specific position of the triggering hole 22 is not limited, and can be set according to the actual situation, but it is necessary to ensure that the triggering hole 22 is staggered with the liquid injection hole 21, and the triggering hole 22 does not interfere with the liquid injection hole 21. In some embodiments, the triggering assembly 3 is arranged on one side of the triggering hole 22, and an additional connecting structure is arranged between the triggering assembly 3 and the triggering hole 22. The connecting structure is triggered through the triggering hole 22, the triggering assembly 3 is triggered, and the positive electrode post 6, the collecting assembly 1 and the negative electrode post 7 are electrically connected. In some other embodiments, in order to improve the compactness of the structure, the triggering assembly 3 is directly opposite the triggering hole 22, and the triggering assembly 3 is directly triggered through the triggering hole 22, without the need for an additional connecting structure, thereby saving parts and improving the compactness of the cover plate assembly 100.

[0047] Optionally, the triggering assembly 3 is installed on the top cover 2 through the triggering hole 22.

[0048] In some embodiments, referring to Figure 5 , the cover plate assembly 100 further comprises two fixing members 8, one of which corresponds to the collecting assembly 1, and the other of which corresponds to the triggering assembly 3. More specifically, the top cover 2 forms a first mounting area and a second mounting area, the collecting assembly 1 is arranged in the first mounting area, a plurality of first through holes are formed on the first mounting area, a plurality of second through holes corresponding to the first through holes are formed on the fixing member 8 corresponding to the collecting assembly 1, and a fastener passes through the plurality of first through holes and the plurality of second through holes to fix the collecting assembly 1 on the first mounting area. The fixing method of the triggering assembly 3 is the same as that of the collecting assembly 1, and the fixing method of the collecting assembly 1 can be referred to, which will not be described here.

[0049] Optionally, referring to Figure 6 and Figure 7The triggering component 3 further comprises a switch 4 electrically connected to the collecting component 1 to control the on-off of the collecting loop in which the collecting component 1 is located. Specifically, the switch 4 can be arranged between the collecting component 1 and the positive pole 6, and the switch 4 can also be arranged between the collecting component 1 and the negative pole 7. The switch 4 is arranged to protect the collecting component 1. When assembling the battery cell, the switch 4 is used to disconnect the collecting component 1 from the positive pole 6 or the negative pole 7 to avoid the collecting component 1 from being ablated during the assembling process. After the assembling of the battery cell is completed, the switch 4 is used to connect the collecting component 1 to the positive pole 6 or the negative pole 7 to enable the collecting component 1 to collect the parameter information of the electrode component.

[0050] In some embodiments, before the assembling of the battery cell is completed, the switch 4 is in an open state to cut off the collecting loop in which the collecting component 1 is located. After the assembling of the battery cell is completed, the switch 4 is in a closed state to enable the collecting loop in which the collecting component 1 is located.

[0051] It should be noted that the arrangement of the switch 4 is not limited and can be selected according to actual conditions.

[0052] In some embodiments, referring to Figure 7 The triggering component 3 is in a normally open state. In a normal state, the collecting loop is in an open state (i.e., the collecting component 1 is always electrically connected to the positive pole 6 and the negative pole 7). When the cover component 100 needs to be assembled on the electrode component (i.e., when the battery cell is in an assembling state), the switch 4 is pushed by the glue particle 9 to disconnect the switch 4, and the collecting loop is in a disconnected state (i.e., the collecting component 1 is always disconnected from the positive pole 6 and the negative pole 7). Since the glue particle 9 is always in the switch 4, the switch 4 cannot be closed, and the collecting component 1 is always in a disconnected state. When the cover component 100 is assembled on the electrode component, the glue particle 9 is pulled out from the triggering hole 22, the switch 4 rebounds to enable the collecting loop, and the collecting component 1 is enabled to collect the parameter information of the electrode component. The gap sealing of the sealing aluminum sheet is used to fill the triggering hole 22 to avoid the triggering hole 22 from being connected to the outside to cause the water vapor in the outside to enter the battery cell.

[0053] In some other embodiments, referring to Figure 6, the trigger assembly 3 is in a normally closed state, that is, the collection loop is always in an open circuit state (that is, the collection assembly 1 and the positive pole 6 and the negative pole 7 are always in a disconnected state) When it is necessary to assemble the cover plate assembly 100 on the motor assembly (that is, when the battery cell is in an assembled state), the collection loop is in an open circuit state, the collection assembly 1 and the positive pole 6 and the negative pole 7 are always in a disconnected state, and the switch 4 is in an open state. The collection assembly 1 is always in a power-off state. When the cover plate assembly 100 is assembled with the electrode assembly, the granular glue 9 is inserted into the trigger hole 22, the granular glue 9 triggers the switch 4, the switch 4 is closed, thereby conducting the collection loop, so that the collection assembly 1 is powered on, and the collection assembly 1 can collect the parameter information of the electrode assembly. Subsequently, the granular glue 9 is pulled out, and the gap is sealed by a sealing aluminum sheet, the sealing aluminum sheet fills the trigger hole 22, and the trigger hole 22 is prevented from being in communication with the outside, so that water vapor and the like in the outside enters the inside of the battery cell.

[0054] It should be noted that in the above embodiment, when the second injection of electrolyte is completed in the battery cell (that is, the battery cell is assembled), the trigger assembly 3 is triggered through the trigger hole 22, so that the collection assembly 1 is in communication with the collection loop, and the collection assembly 1 collects the parameter information of the electrode assembly.

[0055] Optionally, referring to Figure 3 and Figure 4 , the trigger hole 22 has a first end 221 close to the electrode assembly and a second end 222 away from the electrode assembly. In the direction from the first end 221 to the second end 222, the hole diameter of the trigger hole 22 is gradually increased. In this way, the granular glue 9 can smoothly pass through the trigger hole 22 and contact the trigger assembly 3. The trigger hole 22 is designed to be large on the outside and small on the inside. On the one hand, it is convenient to install and disassemble. On the other hand, reducing the hole diameter of the trigger hole 22 reduces the probability of water vapor entering the inside of the battery cell and improves the sealing performance.

[0056] In some embodiments, referring to Figure 4 , the trigger hole 22 includes a first hole and a second hole. The first hole is arranged close to the electrode assembly, and the second hole is arranged away from the electrode assembly. The first hole and the second hole are in communication, and the hole diameter of the first hole is smaller than that of the second hole.

[0057] Optionally, the diameter of the first end 221 is D1, and the diameter of the second end 222 is D2, and 1.9≤D2 / D1≤2.5. It should be noted that when D2 / D1 is less than 1.9, the diameter of the first end 221 is small, and the granular glue 9 cannot pass through the trigger hole 22 and contact the trigger assembly 3, so that the trigger assembly 3 cannot be triggered through the trigger hole 22. When D2 / D1 is greater than 2.5, the hole diameter of the trigger hole 22 is large, the sealing difficulty is increased, and the water vapor in the air is easy to enter the battery cell through the trigger hole 22.

[0058] In some embodiments, 1mm≤D1≤2.2mm, specifically, D1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm or other data not listed.

[0059] In some embodiments, please continue to refer to Figure 4 , the hole diameter of the trigger hole 22 is H, 0.05mm≤H≤1.2mm. When H is greater than 1.2mm, the hole diameter of the trigger hole 22 is too deep, and the difficulty of the gel particle 9 to contact the trigger assembly 3 through the trigger hole 22 increases. When H is less than 0.05mm, the thickness of the top cover 2 is too thin and is prone to breakage. Specifically, H can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm or other data not listed.

[0060] Optionally, the specific positions of the liquid injection hole 21 and the trigger hole 22 are not limited as long as they do not coincide. In some embodiments, please refer to Figure 1 , the top cover 2 is provided with a pressure relief valve 5, the pressure relief valve 5 has a first symmetry line extending along the width direction of the top cover 2, the center of the circle where the trigger hole 22 is located is located on the first symmetry line, the pressure relief valve 5 has a second symmetry line extending along the length direction of the top cover 2, and the center of the circle where the liquid injection hole 21 is located is located on the second symmetry line.

[0061] Optionally, the shortest distance between the center of the circle where the trigger hole 22 is located and the center line of the pressure relief valve 5 is L, 17mm≤L≤22mm. It should be noted that when L is less than 17mm, the trigger hole 22 is too close to the pressure relief valve 5, and when the trigger assembly 3 is triggered by passing through the trigger hole 22, the pressure relief valve 5 is easily opened, causing the pressure relief valve 5 to open. When L is greater than 22mm, the trigger hole 22 is too far from the pressure relief valve 5, causing the size of the top cover 2 to increase and the space occupied to increase. Specifically, L can be 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm, 21mm, 21.5mm, 22mm or other data not listed.

[0062] In some embodiments, the cover plate assembly 100 further comprises a lower plastic part, a connecting aluminum sheet, a compression ring, an upper plastic part and a protective sheet, and the setting and connection modes of the lower plastic part, the connecting aluminum sheet, the compression ring, the upper plastic part and the protective sheet can be set according to the conventional setting in the art, which will not be described here.

[0063] The utility model also proposes a kind of battery, and battery includes above-mentioned cover plate subassembly 100.The specific structure of cover plate subassembly 100 refers to above-mentioned embodiment, since the battery of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer elaborates one by one.

[0064] Further, the battery further includes a shell and a battery cell, the shell has an installation cavity formed therein, the battery cell is provided with the cover plate subassembly 100, and the battery cell and the cover plate subassembly 100 are arranged in the shell.

[0065] The utility model also proposes a kind of battery module, and the battery module includes above-mentioned battery.The specific structure of battery refers to above-mentioned embodiment, since the battery module of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer elaborates one by one.

[0066] The utility model also proposes a kind of battery pack, and the battery pack includes above-mentioned battery module.The specific structure of battery module refers to above-mentioned embodiment, since the battery pack of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer elaborates one by one.

[0067] In addition, the utility model also proposes a kind of electric equipment, and the electric equipment includes above-mentioned battery pack.The specific structure of battery pack refers to above-mentioned embodiment, since the electric equipment of the utility model adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer elaborates one by one.

[0068] It can be understood that the electric equipment includes but is not limited to electric toys, electric tools, electric vehicles, cars, ships, spacecraft and the like.Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, and spacecraft can include airplanes, rockets, space shuttles and spacecraft.Cars can be fuel cars, gas cars and new energy cars.

[0069] The embodiments of the utility model are introduced in detail above, and the principle and implementation mode of the utility model are described by applying specific examples in this paper;The above embodiment is only used to help understand the method and core idea of the utility model;At the same time, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed;As described above, the content of the specification should not be understood as limiting the utility model.

Claims

1. A cover plate assembly (100) characterized by, The cover plate assembly (100) is applied to a battery cell and comprises: a collection assembly (1) configured to be connected with an electrode assembly of the battery cell; a top cover (2) provided with a liquid injection hole (21) and a trigger hole (22), the trigger hole (22) being configured to trigger the collection assembly (1) to collect parameter information of the electrode assembly; wherein the liquid injection hole (21) is arranged apart from the trigger hole (22).

2. The cover plate assembly (100) according to claim 1, characterized in that Further comprising a trigger assembly (3) electrically connected to the collection assembly (1); wherein the trigger hole (22) is configured to trigger the trigger assembly (3) to make the collection assembly (1) collect the parameter information of the electrode assembly.

3. The cover plate assembly (100) according to claim 2, characterized in that The trigger assembly (3) is opposite to the trigger hole (22); and / or, The trigger assembly (3) is mounted on the top cover (2) through the trigger hole (22).

4. The cover plate assembly (100) according to claim 2, characterized in that The trigger assembly (3) further comprises a switch (4) electrically connected to the collection assembly (1) to control the on-off of a collection circuit in which the collection assembly (1) is located.

5. The cover plate assembly (100) according to claim 4, characterized in that After the battery cell is assembled, the switch (4) is in a closed state to turn on the collection circuit in which the collection assembly (1) is located.

6. The cover plate assembly (100) according to claim 5, characterized in that When the battery cell is in the process of assembly, the switch (4) is first in an open state and then in a closed state; or, When the battery cell is in the process of assembly, the switch (4) is first in a closed state and then in an open state.

7. The cover plate assembly (100) according to any one of claims 1-6, characterized in that The trigger hole (22) has a first end (221) close to the electrode assembly and a second end (222) away from the electrode assembly, and the aperture of the trigger hole (22) is gradually increased in the direction from the first end to the second end.

8. The cover plate assembly (100) according to claim 7, characterized in that The diameter of the first end (221) is D1, and the diameter of the second end (222) is D2, 1.9≤D2 / D1≤2.

5.

9. The cover plate assembly (100) of claim 1, wherein, The top cover is provided with an explosion-proof valve (5) having a first symmetry line extending along the width direction of the top cover, and the center of a circle in which the trigger hole (22) is located is located on the first symmetry line.

10. The cover plate assembly (100) according to claim 9, characterized in that The shortest distance between the center of the circle in which the trigger hole (22) is located and the center line of the explosion-proof valve (5) is L, 17mm≤L≤22mm.

11. A battery, characterized by The cover plate assembly (100) comprises the cover plate assembly (100) according to any one of claims 1-10.

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