Battery cell and battery

Abstract

The application relates to a battery monomer and a battery. The battery monomer comprises a shell with an end cover; an insulating piece arranged in the shell, a surface of the insulating piece towards the end cover is recessed to form an exhaust groove, a groove bottom wall of the exhaust groove is provided with a plurality of first through holes; an explosion-proof valve is arranged on the end cover, a projection of the explosion-proof valve in the thickness direction of the end cover completely falls into the exhaust groove; and a blocking piece is arranged in the exhaust groove and is spaced from the groove bottom wall of the exhaust groove, the blocking piece is provided with a plurality of hollow parts and a plurality of blocking parts, and the projections of all the blocking parts in the thickness direction of the end cover collectively cover at least part of all the first through holes. The battery monomer and the battery provided by the application can reduce damage to the explosion-proof valve caused by electrolyte impact, improve the overall structural stability and reliability of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology

[0002] For traditional battery cells, the explosion-proof valve is prone to breakage during national standard safety drop tests. The main reason for this breakage is that during the drop, the electrolyte with mass m inside the battery cell experiences acceleration a. When the battery cell's terminal contacts the ground, the explosion-proof valve's velocity becomes zero, but the electrolyte exerts an impact force of magnitude am on the valve. If this impact force exceeds the explosion-proof valve's withstand capability, it will break or even leak.

[0003] Considering that battery cells may become larger in the future, the mass of the free electrolyte inside the battery cell may also increase, which would have a greater impact on the explosion-proof valve and increase the safety hazards.

[0004] Therefore, how to reduce the damage to the explosion-proof valve caused by electrolyte impact and improve the overall structural stability and reliability of the battery are urgent problems to be solved in the field of battery design. Utility Model Content

[0005] Therefore, it is necessary to provide a battery cell and battery that can reduce the damage to the explosion-proof valve caused by electrolyte impact and improve the overall structural stability and reliability of the battery, in order to address the above problems.

[0006] On one hand, this application provides a single battery cell, which includes:

[0007] The outer casing has end caps;

[0008] An insulating component is disposed inside the housing. The surface of the insulating component facing the end cap is recessed to form an exhaust groove. The bottom wall of the exhaust groove is provided with several first through holes.

[0009] An explosion-proof valve is disposed on the end cap, the projection of the explosion-proof valve in the thickness direction of the end cap falling completely into the vent groove; and

[0010] A blocking member is located inside the exhaust groove and is spaced apart from the bottom wall of the exhaust groove. The blocking member has a plurality of hollowed-out portions and a plurality of blocking portions. The projections of all the blocking portions in the thickness direction of the end cap together cover at least a portion of all the first through holes.

[0011] In some embodiments, all the first through holes are arranged sequentially at intervals along one direction, and each pair of adjacent first through holes defines a connection area on the bottom wall of the groove.

[0012] A hollow portion is provided between each pair of adjacent blocking portions. Each blocking portion corresponds to a first through hole. The projection of the blocking portion in the thickness direction of the end cap covers the corresponding first through hole. Each hollow portion corresponds to a connecting area. The projection of the hollow portion in the thickness direction of the end cap covers the corresponding connecting area.

[0013] In some embodiments, the blocking member further includes a connecting portion, which corresponds one-to-one with the hollow portion. The connecting portion is disposed in the corresponding hollow portion and connects the two blocking portions adjacent to the hollow portion.

[0014] In some embodiments, the connecting portion extends toward and connects to the connecting region disposed opposite to it.

[0015] In some embodiments, the blocking member further includes a support portion, and at least one of the blocking portions is connected to the sidewall of the exhaust channel via the support portion.

[0016] In some embodiments, the support extends continuously along the circumference of the exhaust channel and is connected to all the blocking portions; or, the first and last blocking portions are both connected to the channel sidewall of the exhaust channel through the support.

[0017] In some embodiments, the projected area of ​​all the blocking portions in the thickness direction of the end cap is S, the sum of the areas of all the first through holes is S1, the area of ​​the bottom wall of the exhaust groove is S2, S1≤0.8S2, and S1≤S<1.25S1.

[0018] And / or, the depth of the exhaust groove is h, the distance between the blocking part and the bottom wall of the exhaust groove is h1, and h / 5 ≤ h1 < h.

[0019] In some embodiments, the sidewall of the exhaust channel is provided with a plurality of second through holes, all of which are spaced apart circumferentially along the exhaust channel and are close to the explosion-proof valve relative to the blocking member.

[0020] In some embodiments, the battery cell further includes a patch located outside the housing and disposed on the end cap, and the patch covers the explosion-proof valve.

[0021] On the other hand, this application provides a battery comprising a battery cell as described in any of the above embodiments.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] In the aforementioned battery cell and battery, when the battery cell falls and the speed of the battery cell casing and explosion-proof valve becomes zero, the electrolyte still has a certain acceleration, causing it to enter the space between the blocking component and the bottom wall of the venting channel through the first through hole on the bottom wall of the venting channel. Since the projections of all the blocking components in the thickness direction of the end cap cover at least a portion of all the first through holes, the speed of the electrolyte decreases or even becomes zero due to the blocking effect of the blocking components, and the energy of the electrolyte decreases. In this case, a portion of the electrolyte will flow back directly from the first through hole to the side of the insulating component facing away from the end cap, thus avoiding impact on the explosion-proof valve. The remaining portion of the electrolyte may flow through the perforated part to the explosion-proof valve and impact it. However, since the mass and speed of the electrolyte impacting the explosion-proof valve are reduced, the impact effect is also smaller, reducing the risk of leakage due to damage to the explosion-proof valve. Ultimately, this achieves the goal of reducing damage to the explosion-proof valve caused by electrolyte impact and improving the overall structural stability and reliability of the battery under high power output and high impact environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0025] Figure 2 for Figure 1 The diagram shows the structural arrangement of the end cap, insulating components, explosion-proof valve, blocking components, patch, positive terminal, and negative terminal in a single battery cell.

[0026] Figure 3 for Figure 2 The structure shown is a cross-sectional view taken along the AA direction;

[0027] Figure 4 for Figure 3 An enlarged schematic diagram of a portion of structure B of the structure shown;

[0028] Figure 5 for Figure 2 The structure shown is a top view with the positive and negative terminals removed;

[0029] Figure 6 This is a top view of an insulating element in one embodiment of this application;

[0030] Figure 7 This is a top view of the cooperation between the blocking member and the insulating member in one embodiment of this application;

[0031] Figure 8 This is a top view of the barrier and the insulating member cooperating in another embodiment of this application;

[0032] Figure 9 This is a top view of the cooperation between the blocking member and the insulating member in another embodiment of this application;

[0033] Figure 10 This is a top view of the cooperation between the blocking member and the insulating member in another embodiment of this application;

[0034] Figure 11 for Figure 10 An enlarged schematic diagram of a local structure C in the structure shown.

[0035] Icon labels:

[0036] 100. Battery cell;

[0037] 10. End cap; 20. Insulating component; 30. Explosion-proof valve; 40. Blocking component; 50. Patch; 60. Positive terminal; 70. Negative terminal;

[0038] 21. Exhaust groove; 22. First through hole; 23. Connection area; 24. Second through hole;

[0039] 41. Hollowed-out section; 42. Blocking section; 42a. First blocking section; 42b. Last blocking section; 43. Connecting section; 44. Supporting section; 45. Through hole. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] For traditional battery cells, the explosion-proof valve is prone to breakage during national standard safety drop tests. The main reason for this breakage is that during the drop, the electrolyte with mass m inside the battery cell experiences acceleration a. When the battery cell's terminal contacts the ground, the explosion-proof valve's velocity becomes zero, but the electrolyte exerts an impact force of magnitude am on the valve. If this impact force exceeds the explosion-proof valve's withstand capability, it will break or even leak.

[0047] Considering that battery cells may become larger in the future, the mass of the free electrolyte inside the battery cell may also increase, which would have a greater impact on the explosion-proof valve and increase the safety hazards.

[0048] Therefore, how to reduce the damage to the explosion-proof valve caused by electrolyte impact and improve the overall structural stability and reliability of the battery are urgent problems to be solved in the field of battery design.

[0049] Please see Figures 1 to 7 In view of this, the applicant, after in-depth research, designed a battery cell 100, which includes a shell, an insulating component 20, an explosion-proof valve 30, and a blocking component 40. The shell has an end cap 10, and the insulating component 20 is disposed inside the shell. The surface of the insulating component 20 facing the end cap 10 is recessed to form an exhaust groove 21. The bottom wall of the exhaust groove 21 has several first through holes 22. The explosion-proof valve 30 is disposed on the end cap 10. The explosion-proof valve 30 is located in the thickness direction of the end cap 10 (e.g., ...). Figure 1 The projection of the first through hole 22 (as shown in the Z direction) falls completely into the exhaust groove 21. The blocking member 40 is located in the exhaust groove 21 and is spaced apart from the bottom wall of the exhaust groove 21. The blocking member 40 has a number of hollowed-out parts 41 and a number of blocking parts 42. The projection of all the blocking parts 42 in the thickness direction of the end cover 10 together covers at least a portion of all the first through holes 22.

[0050] Specifically, the outer casing is the component used to house the electrode assembly and electrolyte. The casing can come in various shapes, such as cylinders or cuboids. It can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloys.

[0051] The outer casing includes a housing and an end cap 10. The housing can be a hollow structure with one end open and one end closed, or with both ends open. The end cap 10 closes to the opening of the housing to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 10 is adapted to the shape of the housing. For example, if the housing is a cuboid structure, the end cap 10 is a rectangular plate structure adapted to the housing; or if the housing is a cylindrical structure, the end cap 10 is a circular plate structure adapted to the housing.

[0052] The end cap 10 is provided with terminals for electrical connection to the electrode assembly to output electrical energy from the battery cell 100. The terminals may include a positive terminal 60 and a negative terminal 70. The positive terminal 60 is electrically connected to the positive tab of the electrode assembly, and the negative terminal 70 is electrically connected to the negative tab of the electrode assembly. The positive terminal 60 and the positive tab can be directly or indirectly connected, and the negative terminal 70 and the negative tab can be directly or indirectly connected.

[0053] The explosion-proof valve 30 is a component that can be actuated to release pressure when the internal pressure of the battery cell 100 exceeds a preset pressure. The specific form and structure of the explosion-proof valve 30 are not limited here and can be selected according to actual needs.

[0054] The insulating component 20 is a part that separates the end cap 10 from the electrode assembly (commonly known as the lower plastic). The insulating component 20 can achieve insulation isolation between the end cap 10 and the electrode assembly. The insulating component 20 can be made of insulating materials such as plastic or rubber.

[0055] The surface of the insulating component 20 facing the end cover 10 is recessed to form an exhaust groove 21. The exhaust groove 21 can increase the distance between the electrode assembly and the explosion-proof valve 30. Therefore, even if the electrode assembly expands during charging and discharging, there can be a certain safe distance between the expanded electrode assembly and the explosion-proof valve 30, thereby avoiding the electrode assembly from squeezing the explosion-proof valve 30 and causing damage to the explosion-proof valve 30.

[0056] The bottom wall of the exhaust trough 21 is provided with several first through holes 22. During depressurization, the high-temperature flue gas passes through the first through holes 22, then breaks through the explosion-proof valve 30 and achieves depressurization. Specifically, the first through holes 22 can be round holes, rectangular holes, etc., and there can be one or more first through holes 22. The first through holes 22 can be arranged regularly or irregularly. The shape, number, and arrangement of the first through holes 22 can be set according to requirements.

[0057] The blocking component 40 is a part used to block the impact of electrolyte on the explosion-proof valve 30. Specifically, the blocking component 40 and the insulating component 20 can be integrally formed or separately formed. The blocking component 40 has a blocking part 42 and a hollow part 41. There can be one or more blocking parts 42 and hollow parts 41. The blocking parts 42 and hollow parts 41 can be arranged alternately, or the blocking parts 42 can be arranged around the circumference of the hollow parts 41. The number and arrangement of the blocking parts 42 and hollow parts 41 can be various, and are not limited here.

[0058] The blocking member 40 is disposed inside the exhaust groove 21, and the blocking member 40 is spaced apart from the bottom wall of the exhaust groove 21. Therefore, there is a gap between the blocking member 40 and the bottom wall of the exhaust groove 21. In this way, when the pressure is released, the high temperature flue gas can enter the space between the blocking member 40 and the bottom wall of the exhaust groove 21 through the first through hole 22 on the bottom wall of the exhaust groove 21, and then flow through the hollow part 41, and then be ejected by the explosion-proof valve 30.

[0059] When the battery cell 100 falls and the speed of the battery cell 100's casing and the explosion-proof valve 30 becomes zero, the electrolyte still has a certain acceleration, causing it to enter the space between the blocking member 40 and the bottom wall of the venting channel 21 through the first through hole 22 on the bottom wall of the venting channel 21. Furthermore, the projections of all the blocking parts 42 in the thickness direction of the end cap 10 collectively cover at least a portion of all the first through holes 22. Therefore, due to the blocking effect of the blocking parts 42, the speed of the electrolyte decreases or even becomes zero, and the energy of the electrolyte decreases. In this situation, a portion of the electrolyte will flow directly back through the first through hole 22 to the side of the insulating member 20 facing away from the end cap 10, thus avoiding impact on the explosion-proof valve 30. The remaining portion of the electrolyte may flow through the perforated part 41 to the explosion-proof valve 30 and impact it. However, since the mass and velocity of the electrolyte impacting the explosion-proof valve 30 are reduced, the impact effect is also smaller, reducing the risk of the explosion-proof valve 30 breaking and leaking. Ultimately, this achieves the goal of reducing the damage to the explosion-proof valve 30 caused by electrolyte impact and improving the overall structural stability and reliability of the battery under high power output and high impact environments.

[0060] Please see Figure 1 , Figures 6 to 11 In some embodiments, all the first through holes 22 are arranged sequentially at intervals along one direction, and each pair of adjacent first through holes 22 defines a connecting area 23 on the bottom wall of the groove; a hollow part 41 is provided between each pair of adjacent blocking parts 42, the blocking part 42 corresponds one-to-one with the first through hole 22, the projection of the blocking part 42 in the thickness direction of the end cap 10 covers the corresponding first through hole 22, the hollow part 41 corresponds one-to-one with the connecting area 23, and the projection of the hollow part 41 in the thickness direction of the end cap 10 covers the corresponding connecting area 23.

[0061] As an example, all first through holes 22 can be along the length of the end cap 10 (e.g., Figure 1 (as shown in the Y direction) and width direction (as shown in the Y direction) Figure 1 (As shown in the X direction) or arranged in a direction that intersects both the length and width directions.

[0062] The projection of the blocking part 42 in the thickness direction of the end cap 10 covers the corresponding first through hole 22, so that the electrolyte flowing out of the first through hole 22 can be blocked by the blocking part 42 corresponding to the first through hole 22 to achieve deceleration or backflow, thereby avoiding excessive impact of the electrolyte on the explosion-proof valve 30 and reducing the risk of damage to the explosion-proof valve 30.

[0063] As for the hollow portion 41 provided between each pair of adjacent blocking portions 42, and the hollow portion 41 corresponds one-to-one with the connecting area 23, the projection of the hollow portion 41 in the thickness direction of the end cover 10 covers the corresponding connecting area 23. Then, when the pressure is released, the high-temperature flue gas ejected from the first through hole 22 to the space between the first through hole 22 and the blocking portion 42 can be quickly ejected through the hollow portion 41 adjacent to the blocking portion 42, which improves the jetting efficiency and avoids the high-temperature flue gas from accumulating inside the battery cell 100 and causing an explosion.

[0064] Please see Figures 7 to 11 In some embodiments, the blocking member 40 further includes a connecting part 43, which corresponds one-to-one with the hollow part 41. The connecting part 43 is disposed in the corresponding hollow part 41 and connects the two blocking parts 42 adjacent to the hollow part 41. In this way, all the blocking parts 42 can be connected to form a whole, so that they can be installed at one time, which is simple and efficient.

[0065] Please see Figure 7 and Figure 11 , Figure 7 and Figure 11 These are schematic diagrams showing the connecting portion 43 extending to the connecting region 23 facing it. In some embodiments, the connecting portion 43 extends and connects to the connecting region 23 opposite to it. In this embodiment, all connecting portions 43 cooperate to support all blocking portions 42, thereby achieving stable installation of the blocking member 40.

[0066] Please see Figure 8 , Figure 9 and Figure 11 In some embodiments, the blocking member 40 further includes a support portion 44, and at least one blocking portion 42 is connected to the sidewall of the exhaust channel 21 through the support portion 44.

[0067] After all the blocking parts 42 are fixed together by the connecting parts 43, the blocking member 40 can be installed and fixed by only one blocking part 42 being connected to the side wall of the exhaust groove 21 through the supporting part 44. This installation method is simple and reliable, and facilitates the rapid installation of the blocking member 40.

[0068] Please see Figure 8 , Figure 9 and Figure 11 In some embodiments, the support portion 44 extends continuously along the circumference of the vent groove 21 and connects to all the blocking portions 42 (e.g., Figure 9 and Figure 11 As shown, Figure 9 The connecting portion 43 is spaced apart from the connecting area 23 facing it. Figure 11The middle connecting portion 43 extends to the connecting area 23 facing it; or, the first blocking portion 42 and the last blocking portion 42 are both connected to the sidewall of the exhaust groove 21 via the support portion 44 (e.g., Figure 8 (As shown).

[0069] The support part 44 extends continuously along the circumference of the exhaust groove 21 and connects with all the blocking parts 42. That is, the support part 44 surrounds all the blocking parts 42 and all the hollow parts 41 within it, and the outer edge of the support part 44 away from the blocking parts 42 and the hollow parts 41 contacts the groove side wall of the exhaust groove 21. This installation method is stable and reliable, and easy to install.

[0070] In this embodiment, to reduce the weight of the support portion 44, a plurality of through holes 45 spaced apart along its circumference can be opened on the support portion 44.

[0071] The first blocking part 42 is defined as the first blocking part 42a, and the last blocking part 42 is defined as the last blocking part 42b. The first blocking part 42a is the first blocking part 42 in the arrangement direction of all blocking parts 42, and the last blocking part 42b is the last blocking part 42 in the arrangement direction of all blocking parts 42. When both the first blocking part 42a and the last blocking part 42b are connected to the sidewall of the exhaust groove 21 through the support part 44, there are two support parts 44, which are symmetrically arranged at opposite ends of the blocking member 40. This design can save material for manufacturing the support part 44 and maintain the stability and reliability of the blocking member 40 installation.

[0072] Of course, the installation method of the blocking part 42 is not limited to the two mentioned above. In some other embodiments, the two opposite ends of the blocking part 42 can extend in the opposite direction to connect with the side wall of the slot of the dispensing slot, thereby realizing the installation of the blocking part 42.

[0073] Please see Figure 4 and Figure 6 In some embodiments, the projected area of ​​all the blocking parts 42 in the thickness direction of the end cap 10 is S, the sum of the areas of all the first through holes 22 is S1, the area of ​​the bottom wall of the exhaust groove 21 is S2, S1≤0.8S2, and S1≤S<1.25S1; and / or, the depth of the exhaust groove 21 is h, the distance between the blocking part 42 and the bottom wall of the exhaust groove 21 is h1, and h / 5≤h1<h.

[0074] As an example, S1 can be, but is not limited to, 0.5S2, 0.6S2, 0.7S2, 0.8S2, etc., S can be, but is not limited to, S1, 1.1S1, 1.2S1, 1.25S1, etc., and h1 can be, but is not limited to, h / 5, h / 4, h / 3, h / 2, etc.

[0075] The larger the proportion of the sum of the areas of all the first through holes 22 to the bottom wall of the exhaust groove 21, the lower the mechanical strength of the exhaust groove 21, and the weaker its blocking effect on the expanding electrode assembly. Therefore, in order to ensure the mechanical strength of the exhaust groove 21 while facilitating exhaust in case of thermal runaway, S1 ≤ 0.8S2 is set.

[0076] Setting S1≤S<1.25S1 has two advantages: firstly, it ensures that the combined area of ​​all the blocking parts 42 is large enough to block the electrolyte from impacting the explosion-proof valve 30; secondly, it prevents the combined area of ​​all the blocking parts 42 from being too large, thus facilitating the flow of high-temperature flue gas and reducing the risk of high-temperature flue gas accumulating in the battery cell 100 and causing thermal runaway.

[0077] When h / 5≤h1<h, there is a suitable distance between the blocking member 40 and the bottom wall of the exhaust channel 21, which is suitable for exhaust. This reduces the risk that the small distance between the blocking member 40 and the bottom wall of the exhaust channel 21 will hinder the flow of high-temperature flue gas.

[0078] Please see Figure 5 and Figure 6 In some embodiments, the sidewall of the exhaust groove 21 is provided with a plurality of second through holes 24, all of which are spaced apart along the circumference of the exhaust groove 21, and all of which are close to the explosion-proof valve 30 relative to the blocking member 40.

[0079] As an example, the second through hole 24 can be a round hole, a rectangular hole, etc., and its specific shape can be set according to requirements.

[0080] During depressurization, high-temperature flue gas enters the exhaust channel 21 through the second through hole 24, and then is ejected through the explosion-proof valve 30. By setting the second through hole 24, the exhaust speed of the battery cell 100 can be accelerated, so as to avoid the accumulation of high-temperature flue gas inside the battery cell 100 and cause an explosion, thereby improving the safety of the battery cell 100.

[0081] It is worth mentioning that during the drop test, the electrolyte can be diverted through the first through hole 22 and the second through hole 24 and enter the exhaust tank 21. The amount of electrolyte after diversion is small, and its impact is not enough to damage the explosion-proof valve 30.

[0082] Please see Figure 1 and Figure 4 In some embodiments, the battery cell 100 further includes a patch 50 located outside the housing and disposed on the end cap 10, and the patch 50 covers the explosion-proof valve 30.

[0083] Specifically, patch 50 is positioned outward relative to explosion-proof valve 30. Patch 50 is used to cover and protect explosion-proof valve 30 to reduce the risk of explosion-proof valve 30 being damaged by external interference.

[0084] This application also provides a battery comprising a battery cell 100 as described in any of the above embodiments. The battery in this application has the effects of any of the above embodiments, and therefore will not be described again here.

[0085] When the battery cell 100 and the battery are dropped, and the speed of the battery cell 100's casing and the explosion-proof valve 30 becomes zero, the electrolyte still has a certain acceleration. This causes the electrolyte to enter the space between the blocking member 40 and the bottom wall of the venting channel 21 through the first through hole 22 on the bottom wall of the venting channel 21. Since the projections of all the blocking parts 42 in the thickness direction of the end cap 10 cover at least a portion of all the first through holes 22, the speed of the electrolyte decreases or even becomes zero due to the blocking effect of the blocking parts 42, and the energy of the electrolyte decreases. In this case, a portion of the electrolyte will flow back directly from the first through hole 22 to the side of the insulating member 20 facing away from the end cap 10, thus avoiding impact on the explosion-proof valve 30. The remaining portion of the electrolyte may flow through the perforated part 41 to the explosion-proof valve 30 and impact it. However, since the mass and velocity of the electrolyte impacting the explosion-proof valve 30 are reduced, the impact effect is also smaller, reducing the risk of the explosion-proof valve 30 breaking and leaking. Ultimately, this achieves the goal of reducing the damage to the explosion-proof valve 30 caused by electrolyte impact and improving the overall structural stability and reliability of the battery under high power output and high impact environments.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The outer casing has end caps (10); An insulating component (20) is disposed inside the housing. The surface of the insulating component (20) facing the end cap (10) is recessed to form an exhaust groove (21). The bottom wall of the exhaust groove (21) is provided with a plurality of first through holes (22). An explosion-proof valve (30) is disposed on the end cap (10), and the projection of the explosion-proof valve (30) in the thickness direction of the end cap (10) falls completely into the exhaust groove (21); and A blocking member (40) is located inside the exhaust groove (21) and is spaced apart from the bottom wall of the exhaust groove (21). The blocking member (40) has a plurality of hollow parts (41) and a plurality of blocking parts (42). The projection of all the blocking parts (42) in the thickness direction of the end cap (10) together covers at least a portion of all the first through holes (22).

2. The battery cell according to claim 1, characterized in that, All the first through holes (22) are arranged sequentially at intervals along one direction, and each pair of adjacent first through holes (22) defines a connecting area (23) on the bottom wall of the groove; A hollow portion (41) is provided between each pair of adjacent blocking portions (42). The blocking portion (42) corresponds one-to-one with the first through hole (22). The projection of the blocking portion (42) in the thickness direction of the end cap (10) covers the corresponding first through hole (22). The hollow portion (41) corresponds one-to-one with the connecting area (23), and the projection of the hollow portion (41) in the thickness direction of the end cap (10) covers the corresponding connecting area (23).

3. The battery cell according to claim 2, characterized in that, The blocking member (40) further includes a connecting part (43), which corresponds one-to-one with the hollow part (41). The connecting part (43) is disposed in the corresponding hollow part (41) and connects the two blocking parts (42) adjacent to the hollow part (41).

4. The battery cell according to claim 3, characterized in that, The connecting part (43) extends toward and connects to the connecting area (23) which is disposed opposite to it.

5. The battery cell according to claim 3 or 4, characterized in that, The blocking member (40) further includes a support (44), and at least one of the blocking members (42) is connected to the sidewall of the exhaust channel (21) through the support (44).

6. The battery cell according to claim 5, characterized in that, The support (44) extends continuously along the circumference of the exhaust groove (21) and is connected to all the blocking parts (42); or, the first blocking part (42) and the last blocking part (42) are both connected to the groove sidewall of the exhaust groove (21) through the support (44).

7. The battery cell according to claim 1, characterized in that, The projected area of ​​all the blocking parts (42) in the thickness direction of the end cap (10) is S, the sum of the areas of all the first through holes (22) is S1, the area of ​​the bottom wall of the exhaust groove (21) is S2, S1≤0.8S2, and S1≤S<1.25S1. And / or, the depth of the exhaust groove (21) is h, the distance between the blocking part (42) and the bottom wall of the exhaust groove (21) is h1, and h / 5≤h1<h.

8. The battery cell according to claim 1, characterized in that, The exhaust groove (21) has a plurality of second through holes (24) on its sidewall. All the second through holes (24) are spaced apart along the circumference of the exhaust groove (21), and all the second through holes (24) are close to the explosion-proof valve (30) relative to the blocking member (40).

9. The battery cell according to claim 1, characterized in that, The battery cell also includes a patch (50), which is located outside the housing and disposed on the end cap (10), and the patch (50) covers the explosion-proof valve (30).

10. A battery, characterized in that, The battery comprises a battery cell as described in any one of claims 1 to 9 above.

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