Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and relates to the technical field of batteries. The single battery comprises a battery cell, a cover plate and a shell, the shell is provided with an accommodating cavity and an opening, the cover plate is plugged at the opening, and the battery cell is arranged in the accommodating cavity. A liquid injection hole is formed in the cover plate, a containing groove is formed in the top face of the cover plate and located in the peripheral side of the liquid injection hole, a partition structure is arranged in the containing groove and divides the containing groove into a first containing groove body and a second containing groove body, the first containing groove body is located between the liquid injection hole and the second containing groove body, and a drainage groove is formed in the partition structure. The drainage groove communicates with the first containing groove and the second containing groove, and the bottom wall of the drainage groove is higher than the bottom wall of the first containing groove. According to the single battery provided by the invention, the double effects of drainage and blocking of the electrolyte are realized, so that the possibility of polluting and corroding the top cover assembly after the electrolyte overflows is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] During the production and manufacturing process of single cells, electrolyte needs to be injected into the battery casing through the injection hole of the top cover assembly. However, after the injection is completed, the electrolyte may overflow from the injection hole. The overflowed electrolyte will contaminate and corrode the poles, explosion-proof valves and other components in the top cover assembly, resulting in a greater safety hazard and risk of functional failure in the top cover assembly. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a single cell and a battery pack, aiming to solve the technical problem in the prior art that the electrolyte overflowing from the injection hole will contaminate and corrode the top cover assembly, posing a great safety hazard and risk of functional failure.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] In a first aspect, an embodiment of the present application provides a single cell, comprising:

[0006] Battery cells;

[0007] Cover plate;

[0008] A shell, wherein the shell has a receiving cavity and an opening, the cover plate is sealed at the opening, and the battery cell is arranged in the receiving cavity;

[0009] The cover plate is provided with an injection hole, and a receiving groove is provided on the top surface of the cover plate, the receiving groove is located on the outer peripheral side of the injection hole, and a blocking structure is provided in the receiving groove, the blocking structure divides the receiving groove into a first receiving groove and a second receiving groove, the first receiving groove is located between the injection hole and the second receiving groove, and a drainage groove is provided on the blocking structure, the drainage groove is respectively connected with the first receiving groove and the second receiving groove, and the bottom wall of the drainage groove is higher than the bottom wall of the first receiving groove.

[0010] In one embodiment of the first aspect, the second receiving groove is an annular receiving groove, the drainage groove includes a plurality of sub-drainage grooves, two adjacent sub-drainage grooves are arranged at intervals, and each sub-drainage groove is connected to the first receiving groove and the second receiving groove.

[0011] In one embodiment of the first aspect, the cover plate has a thickness direction and a first direction and a second direction perpendicular to the thickness direction, and the first direction is perpendicular to the second direction;

[0012] The single cell battery also includes a pressure relief structure and a terminal assembly, the pressure relief structure and the terminal assembly are respectively arranged on the top surface of the cover plate, the terminal assembly includes a positive electrode column and a negative electrode column, the positive electrode column, the negative electrode column and the pressure relief structure are spaced apart along the first direction, and the injection hole is located between the positive electrode column and the pressure relief structure or between the negative electrode column and the pressure relief structure.

[0013] In one of the embodiments of the first aspect, the second receiving groove includes a plurality of sub-receiving grooves, and the plurality of sub-receiving grooves are spaced apart on the outer peripheral side of the injection hole; the drainage groove includes a plurality of sub-drainage grooves, and the plurality of sub-drainage grooves are spaced apart on the outer peripheral side of the injection hole, and each of the sub-receiving grooves is connected to the first receiving groove through one sub-drainage groove.

[0014] In one of the embodiments of the first aspect, the cover plate has a thickness direction and a projection plane perpendicular to the thickness direction, the multiple sub-accommodating grooves include at least one first sub-accommodating groove and at least one second sub-accommodating groove, the multiple sub-drainage grooves include at least one first sub-drainage groove and at least one second sub-drainage groove, each of the first sub-accommodating grooves is connected to the first accommodating groove through a first sub-drainage groove, each of the second sub-accommodating grooves is connected to the first accommodating groove through a second sub-drainage groove, the volume of each first sub-accommodating groove is V1, the volume of each second sub-accommodating groove is V2, the orthographic projection area of ​​each first sub-drainage groove on the projection plane is S1, the orthographic projection area of ​​each second sub-drainage groove on the projection plane is S2, satisfying: V1>V2, S1>S2.

[0015] In one embodiment of the first aspect, each of the sub-accommodating grooves is in an arc shape, and each of the sub-drainage grooves is in an arc shape; and / or

[0016] Each of the sub-accommodating grooves is rectangular, and each of the sub-drainage grooves is rectangular.

[0017] In one of the embodiments of the first aspect, in the thickness direction of the cover plate, the depth of the first receiving groove and / or the second receiving groove is H1, and the distance between the bottom wall of the drainage groove and the bottom wall of the first receiving groove or the bottom wall of the second receiving groove is H2, satisfying: 0.05≤H2 / H1≤0.75.

[0018] In one embodiment of the first aspect, the thickness of the cover plate is T, and in the thickness direction of the cover plate, the depth of the first receiving groove and / or the second receiving groove is H1, satisfying: 0.2≤H1 / T≤0.8.

[0019] In one of the embodiments of the first aspect, a first boss is arranged on the bottom wall of the first receiving groove, and the first boss is arranged around the injection hole to isolate the injection hole and the first receiving groove, and the side of the first boss away from the bottom wall of the first receiving groove is flush with the top surface of the cover plate.

[0020] In one of the embodiments of the first aspect, a second boss is disposed on the top surface of the cover plate, and the second boss is disposed around the second receiving groove.

[0021] In a second aspect, an embodiment of the present application further provides a battery pack, comprising the single cell battery described in the above embodiment.

[0022] The beneficial effects of this application are:

[0023] The present application provides a single cell battery, including a cover plate provided with a liquid injection hole, a receiving groove is provided on the outer peripheral side of the liquid injection hole, and a baffle structure is provided in the receiving groove, so as to realize the separation of the receiving groove into a first receiving groove and a second receiving groove, on this basis, a drainage groove is provided on the baffle structure, so that the drainage groove is connected with the first receiving groove and the second receiving groove respectively, and the bottom wall of the drainage groove is higher than the bottom wall of the first receiving groove. Among them, the first receiving groove can collect the electrolyte overflowing from the liquid injection hole, the baffle structure plays the role of blocking and buffering the electrolyte, and when the first receiving groove is full of electrolyte, the drainage groove can introduce the electrolyte into the second receiving groove for further collection. In this way, the dual effects of drainage and blocking of the electrolyte are achieved, thereby effectively reducing the possibility of contamination and corrosion of electrical components such as explosion-proof valves and poles in the top cover assembly after the electrolyte overflows, thereby reducing the safety hazards and functional failure risks of the top cover assembly.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the three-dimensional structure of the top cover assembly in some embodiments of the present application is shown;

[0027] Figure 2 A partial structural schematic diagram of a top cover assembly in some embodiments of the present application is shown;

[0028] Figure 3 Shows Figure 2 Schematic diagram of the structure of part A;

[0029] Figure 4 A partial structural schematic diagram of a top cover assembly from one perspective in some embodiments of the present application is shown;

[0030] Figure 5 Shows Figure 4 A schematic diagram of the half-section structure of the middle top cover assembly at BB;

[0031] Figure 6 A partial structural schematic diagram of a top cover assembly in some other embodiments of the present application is shown;

[0032] Figure 7 A schematic diagram of the three-dimensional structure of the top cover assembly in some other embodiments of the present application is shown;

[0033] Figure 8 A partial structural schematic diagram of a top cover assembly in some other embodiments of the present application is shown;

[0034] Fig. 9 A schematic diagram of the three-dimensional structure of the top cover assembly in some other embodiments of the present application is shown;

[0035] Fig.10 A partial structural schematic diagram of a top cover assembly in some further embodiments of the present application is shown.

[0036] Description of main component symbols:

[0037] 100-top cover assembly; 110-cover plate; 111-liquid injection hole; 112-first receiving groove; 113-second receiving groove; 1131-sub-receiving groove; 1132-first sub-receiving groove; 1133-second sub-receiving groove; 1134-third sub-receiving groove; 1135-fourth sub-receiving groove; 114-blocking structure; 115-drainage groove; 1151-sub-drainage groove; 1152-first sub-drainage groove; 1153-second sub-drainage groove; 1154-third sub-drainage groove; 1155-fourth sub-drainage groove; 1156-side wall; 1157-bottom wall; 116-top surface; 120-pressure relief structure; 130-terminal assembly; 131-positive pole; 132-negative pole; 140-first boss; 150-second boss; x-first direction; y-second direction; z-thickness direction. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] like Figure 1As shown, in the first aspect, an embodiment of the present application provides a top cover assembly 100, which relates to the field of battery technology and is mainly used in single cells, such as square batteries, cylindrical batteries, etc.

[0044] Combination Figures 1 to 3 As shown, the top cover assembly 100 includes a cover plate 110, a liquid injection hole 111 is provided on the cover plate 110, a receiving groove is provided on the top surface 116 of the cover plate 110, the receiving groove is located on the outer peripheral side of the liquid injection hole 111, a partition structure 114 is provided in the receiving groove, the partition structure 114 is used to separate the receiving groove into a first receiving groove 112 and a second receiving groove 113, the first receiving groove 112 is located between the liquid injection hole 111 and the second receiving groove 113, a drainage groove 115 is provided on the partition structure 114, the drainage groove 115 is connected to the first receiving groove 112 and the second receiving groove 113 respectively, and the bottom wall 1157 of the drainage groove 115 is higher than the bottom wall of the first receiving groove 112.

[0045] It should be noted that the single battery mainly includes a top cover assembly 100, a shell and a battery cell. The battery cell is arranged in the shell, and the top cover assembly 100 is sealed at the opening of the shell. The top surface 116 of the above-mentioned cover plate 110 refers to the side of the cover plate 110 away from the battery cell.

[0046] It should be mentioned that during the manufacturing process of the single cell, the electrolyte needs to be injected into the shell of the single cell through the injection hole of the top cover assembly so that the electrolyte can soak the battery cell in the shell. However, after the injection is completed, the electrolyte may overflow from the injection hole, and the overflowed electrolyte will contaminate and corrode the top cover assembly, resulting in a greater safety hazard and risk of functional failure of the top cover assembly.

[0047] It can be understood that the top cover assembly 100 provided in this embodiment includes a cover plate 110 provided with a liquid injection hole 111, and a receiving groove is provided on the outer peripheral side of the liquid injection hole 111, and a baffle structure 114 is provided in the receiving groove to realize the separation of the receiving groove into a first receiving groove 112 and a second receiving groove 113. On this basis, a drainage groove 115 is provided on the baffle structure 114, so that the drainage groove 115 is connected with the first receiving groove 112 and the second receiving groove 113 respectively, and the bottom wall 1157 of the drainage groove 115 is higher than the bottom wall of the first receiving groove 112. Among them, the first receiving groove 112 can collect the electrolyte overflowing from the liquid injection hole 111, the baffle structure 114 plays the role of blocking and buffering the electrolyte, and when the first receiving groove 112 is full of electrolyte, the drainage groove 115 can introduce the electrolyte into the second receiving groove 113 for further collection. In this way, the dual effects of drainage and blocking of the electrolyte are achieved, thereby effectively reducing the possibility of contamination and corrosion of the top cover assembly 100 after the electrolyte overflows, thereby reducing the safety hazards and functional failure risks of the top cover assembly 100.

[0048] In a specific embodiment, the bottom walls of the first receiving groove 112 and the second receiving groove 113 are lower than the top surface 116 of the cover plate 110, that is, the first receiving groove 112 and the second receiving groove 113 are both formed by the top surface 116 of the cover plate 110 being recessed toward one side of the battery cell.

[0049] like Figure 2 and Figure 4 As shown, in one embodiment, the first receiving groove 112 and the second receiving groove 113 are annular receiving grooves, and the drainage groove 115 includes a plurality of sub-drainage grooves 1151, and two adjacent sub-drainage grooves 1151 are arranged at intervals, and each sub-drainage groove 1151 is connected to the first receiving groove 112 and the second receiving groove 113.

[0050] Exemplarily, the number of sub-drainage grooves 1151 can be six. Of course, it can also be two, three, four, five, seven, eight, etc., and can be specifically set according to design requirements.

[0051] In this embodiment, by providing a plurality of sub-drainage grooves 1151 that are spaced apart, each sub-drainage groove 1151 is connected to the first receiving groove 112 and the second receiving groove 113, so that when the first receiving groove 112 is full of electrolyte, the electrolyte that continues to overflow can be evenly dispersed through the plurality of sub-drainage grooves 1151 and flow into the annular second receiving groove 113. In this process, the barrier structure 114 provided with a plurality of sub-drainage grooves 1151 plays a dual role of effective blocking and drainage, thereby reducing the risk of contamination and corrosion of the top cover assembly 100 after the electrolyte overflows, improving the safety of the top cover assembly 100, and reducing the risk of functional failure of the top cover assembly 100.

[0052] like Figure 1 As shown, in one embodiment, the cover plate 110 has a thickness direction z and a first direction x and a second direction y perpendicular to the thickness direction z, and the first direction x is perpendicular to the second direction y. The top cover assembly 100 also includes a pressure relief structure 120 and a terminal assembly 130, which are respectively arranged on the top surface 116 of the cover plate 110, and the terminal assembly 130 includes a positive electrode column 131 and a negative electrode column 132, and the positive electrode column 131, the negative electrode column 132 and the pressure relief structure 120 are spaced apart along the first direction x, and the injection hole 111 is located between the positive electrode column 131 and the pressure relief structure 120 or between the negative electrode column 132 and the pressure relief structure 120.

[0053] Exemplarily, the pressure relief structure 120 is an explosion-proof valve. When the pressure or temperature inside the shell of the single battery exceeds a threshold, the explosion-proof valve will rupture from the notch to release excess gas, thereby reducing the pressure inside the shell and preventing the single battery from exploding. Of course, the pressure relief structure 120 can also be a pressure release device, a heat release device, etc.

[0054] It should be mentioned that after the injection is completed, the electrolyte may overflow from the injection hole, and the overflowed electrolyte may penetrate into the terminal assembly 130, causing the terminal assembly 130 to short-circuit with the cover plate 110, posing a greater safety hazard. In addition, the overflowed electrolyte may flow into the pressure relief structure 120. If it is not cleaned up in time, the residual electrolyte will corrode the pressure relief structure 120, causing the strength and service life of the pressure relief structure 120 to be reduced, increasing the risk of failure of the pressure relief function.

[0055] In this embodiment, the positive electrode column 131, the negative electrode column 132 and the pressure relief structure 120 are spaced apart along the first direction x, and the injection hole 111 is arranged between the positive electrode column 131 and the pressure relief structure 120, or between the negative electrode column 132 and the pressure relief structure 120, so that the injection hole 111 has a certain interval with the terminal assembly 130 and the pressure relief structure 120 respectively. On this basis, the first receiving groove 112, the second receiving groove 113 and the blocking structure 114 provided with the drainage groove 115 have the effect of collecting, blocking and draining the electrolyte, thereby effectively reducing the probability of the electrolyte overflowing and flowing to the terminal assembly 130 and the pressure relief structure 120.

[0056] like Figure 6 , Figure 7 and Fig. 9 As shown, in another embodiment, the second receiving groove 113 includes a plurality of sub-receiving grooves 1131, and the plurality of sub-receiving grooves 1131 are spaced apart on the outer peripheral side of the injection hole 111, and the drainage groove 115 includes a plurality of sub-drainage grooves 1151, and the plurality of sub-drainage grooves 1151 are spaced apart on the outer peripheral side of the injection hole 111, and each sub-receiving groove 1131 is connected to the first receiving groove 112 through a sub-drainage groove 1151.

[0057] For example, Figure 7 As shown, each sub-accommodating groove 1131 may be in an arc shape, and each sub-drainage groove 1151 may be in an arc shape. Fig. 9 As shown, each sub-accommodating groove 1131 may be rectangular, and each sub-drainage groove 1151 may be rectangular. In addition, the number of sub-accommodating grooves 1131 and sub-drainage grooves 1151 may be two or four. Of course, they may also be three, five, six, seven, eight, etc.

[0058] In this embodiment, the second receiving tank 113 is divided into a plurality of sub-receiving tanks 1131, and the drainage tank 115 is divided into a plurality of sub-drainage tanks 1151, so that each sub-receiving tank 1131 is connected to the first receiving tank 112 through a sub-drainage tank 1151. In this way, when the first receiving tank 112 is filled with electrolyte, the electrolyte will be dispersed through the plurality of sub-drainage tanks 1151 and flow into the plurality of sub-receiving tanks 1131 one by one to continue to be collected, thereby reducing the risk of contaminating and corroding the top cover assembly 100 after the electrolyte overflows from the injection hole 111.

[0059] like Figure 8 As shown, in a specific embodiment, the cover plate 110 has a thickness direction z and a projection plane perpendicular to the thickness direction z, the plurality of sub-accommodating grooves 1131 include at least one first sub-accommodating groove 1132 and at least one second sub-accommodating groove 1133, the at least one first sub-accommodating groove 1132 is relatively arranged along the second direction y, and the at least one second sub-accommodating groove 1133 is relatively arranged along the first direction x, the plurality of sub-drainage grooves 1151 include at least one first sub-drainage groove 1152 and at least one second sub-drainage groove 1153, each first sub-accommodating groove 1131 includes at least one first sub-accommodating groove 1132 and at least one second sub-accommodating groove 1133, the at least one first sub-accommodating groove 1132 is relatively arranged along the second direction y, and the at least one second sub-accommodating groove 1133 is relatively arranged along the first direction x, Each groove 1132 is connected to the first receiving groove 112 through a first sub-drainage groove 1152, and each second sub-receiving groove 1133 is connected to the first receiving groove 112 through a second sub-drainage groove 1153. The volume of each first sub-receiving groove 1132 is V1, and the volume of each second sub-receiving groove 1133 is V2. The orthographic projection area of ​​each first sub-drainage groove 1152 on the projection plane is S1, and the orthographic projection area of ​​each second sub-drainage groove 1153 on the projection plane is S2, satisfying: V1>V2, S1>S2.

[0060] Exemplarily, the number of the first sub-accommodating grooves 1132 and the number of the second sub-accommodating grooves 1133 may both be set to two.

[0061] It can be understood that, based on the above structure, when the first receiving tank 112 is full of electrolyte, the electrolyte that continues to overflow from the outer peripheral side of the first receiving tank 112 will flow into the second receiving tank 113 through the drainage groove 115, and, compared with the second sub-receiving tank 1133, the first sub-receiving tank 1132 has a larger volume and can accommodate more electrolyte. Compared with the second sub-drainage groove 1153, the first sub-drainage groove 1152 has a larger drainage cross-sectional area, which can guide most of the electrolyte that continues to overflow in a direction away from the pressure relief structure 120 and the terminal assembly 130, that is, guide the overflowing electrolyte in the second direction y, thereby reducing the possibility of the electrolyte flowing to the pressure relief structure 120 and the terminal assembly 130 after overflowing.

[0062] like Fig.10As shown, in another specific embodiment, the above-mentioned multiple sub-accommodating grooves 1131 include a third sub-accommodating groove 1134 and a fourth sub-accommodating groove 1135, and the drainage groove 115 includes a third sub-drainage groove 1154 and a fourth sub-drainage groove 1155. The third sub-accommodating groove 1134 is located on one side of the first accommodation groove 112 along the second direction y, and the fourth sub-accommodating groove 1135 is located on the other side of the first accommodation groove 112 along the second direction y. The third sub-accommodating groove 1134 is connected to the first accommodation groove 112 through the third sub-drainage groove 1154, and the fourth sub-accommodating groove 1135 is connected to the first accommodation groove 112 through the fourth sub-drainage groove 1155.

[0063] It can be understood that, based on the above structure, when the first containing tank 112 is filled with electrolyte, a portion of the electrolyte that continues to overflow from the first containing tank 112 will flow into the third sub-containing tank 1134 through the third sub-drainage groove 1154, and another portion of the electrolyte that overflows from the first containing tank 112 will flow into the fourth sub-containing tank 1135 through the fourth sub-drainage groove 1155, thereby achieving the goal of directing all the electrolyte that continues to overflow in a direction away from the pressure relief structure 120 and the terminal assembly 130, that is, directing all the electrolyte in the second direction y, which can more effectively reduce the possibility of the electrolyte flowing toward the pressure relief structure 120 and the terminal assembly 130 after overflowing.

[0064] It should be understood that the above only provides some exemplary structures of the second receiving groove 113. In other embodiments, the second receiving groove 113 may also be a U-shaped receiving groove, a serpentine receiving groove, a wavy receiving groove, a triangular receiving groove, etc., and no specific restrictions are made on the structures of the second receiving groove 113 and the first receiving groove 112.

[0065] Combination Figure 4 and Figure 5 As shown, in one embodiment, in the thickness direction z of the cover plate 110, the depth of the first accommodating groove 112 or the second accommodating groove 113 is H1, or the depths of both are set to H1, and the distance between the bottom wall 1157 of the drainage groove 115 and the bottom wall of the first accommodating groove 112 or the bottom wall of the second accommodating groove 113 is H2, satisfying: 0.05≤H2 / H1≤0.75.

[0066] Exemplarily, H2 / H1 may be selected from any value of 0.05, 0.06, 0.08, 0.1, 0.2, 0.5, 0.56, 0.6, 0.7, 0.75, or any value in a range consisting of any two of them.

[0067] It should be noted that if H2 / H1 is too large, the bottom wall 1157 of the drainage groove 115 will be too high, which can effectively block the electrolyte, but will affect the drainage effect of the drainage groove 115 on the electrolyte. If H2 / H1 is too small, the bottom wall 1157 of the drainage groove 115 will be too low, which is conducive to the drainage of the electrolyte, but will affect the barrier effect of the partition structure 114 on the electrolyte.

[0068] In this embodiment, when H2 / H1 is in the range of 0.05 to 0.75, that is, when H2 is set to 5% to 75% of H1, the barrier structure 114 can effectively play a dual role in blocking and draining the electrolyte, thereby effectively reducing the possibility of contamination and corrosion of the top cover assembly 100 after the electrolyte overflows.

[0069] Continue reading Figure 4 and Figure 5 In one embodiment, the thickness of the cover plate 110 is T, and in the thickness direction z of the cover plate 110, the depth of the first receiving groove 112 or the second receiving groove 113 is H1, or the depths of both are set to H1, satisfying: 0.2≤H1 / T≤0.8.

[0070] It should be noted that if H1 / T is too large, although the volume of the containing tank is increased and can hold more electrolyte, the thickness of the cover plate 110 is small, which leads to insufficient structural strength and affects the service life of the top cover assembly 100. If H1 / T is too small, although the structural strength of the cover plate 110 is sufficient, it will affect the volume of electrolyte that can be held in the containing tank.

[0071] In this embodiment, when H1 / T is in the range of 0.2 to 0.8, that is, H1 is set to 20% to 80% of T, the containing groove can accommodate more electrolyte while ensuring the structural strength of the cover plate 110, thereby reducing the possibility of contaminating and corroding the top cover assembly 100 after the electrolyte overflows from the injection hole 111.

[0072] like Figure 2 and Figure 8 As shown, in one embodiment, a first boss 140 is provided on the bottom wall of the first receiving groove 112. The first boss 140 is arranged around the injection hole 111 to isolate the injection hole 111 and the first receiving groove 112. The side of the first boss 140 away from the bottom wall of the first receiving groove 112 is flush with the top surface 116 of the cover plate 110.

[0073] In this embodiment, by setting the first boss 140 around the injection hole 111, the first boss 140 can play a preliminary blocking role for the electrolyte, thereby increasing the difficulty of the electrolyte overflowing from the outer peripheral side of the injection hole 111, thereby reducing the possibility of electrolyte contamination and corrosion of the top cover assembly 100.

[0074] like Figure 6 As shown, in one embodiment, a second boss 150 is disposed on the top surface 116 of the cover plate 110, and the second boss 150 is disposed around the second receiving groove 113. In this way, when the second receiving groove 113 is filled with electrolyte, the second boss 150 can prevent the electrolyte from continuing to overflow from the outer peripheral side of the second receiving cavity, thereby reducing the possibility of the electrolyte overflowing from the injection hole 111 and contaminating and corroding the top cover assembly 100.

[0075] Combination Figure 2 and Figure 3 As shown, in one embodiment, the drainage groove 115 has two opposite side walls 1156 , and each side wall 1156 is arranged at a preset angle relative to the bottom wall 1157 of the drainage groove 115 . The preset angle is α, and satisfies: 90°<α<180°.

[0076] In this embodiment, by providing a drainage groove 115 that satisfies the above relationship, the volume of the drainage groove 115 is increased. In this way, after the electrolyte is filled in the first receiving groove 112, the electrolyte that continues to overflow can flow more smoothly to the second receiving groove 113 and continue to be collected by the second receiving groove 113, thereby reducing the possibility of contamination and corrosion of the top cover assembly 100 after the electrolyte overflows.

[0077] In the second aspect, an embodiment of the present application provides a single cell battery, comprising a battery cell, a shell and a top cover assembly 100 in any of the above embodiments, the shell having a accommodating cavity and an opening, the top cover assembly 100 is sealed at the opening, the battery cell is arranged in the accommodating cavity and is electrically connected to the top cover assembly 100.

[0078] It can be understood that during the manufacturing process of the single cell, the filling machine injects electrolyte into the shell of the single cell through the filling hole 111, and then uses a sealing nail to seal the filling hole 111. After the electrolyte fully infiltrates the battery cell in the shell, it enters the formation process to activate the active material inside the single cell so that the single cell has the ability to charge and discharge.

[0079] In a third aspect, an embodiment of the present application provides a battery pack, comprising the single cell in the above embodiment.

[0080] It can be understood that since the battery pack provided in this embodiment has the top cover assembly 100 in any of the above embodiments, it has all the beneficial effects of the top cover assembly 100, which will not be listed one by one here.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A single cell battery, characterized in that: include: Battery cells; A cover plate (110); A shell, the shell having a containing cavity and an opening, the cover plate (110) being sealed at the opening, and the battery cell being arranged in the containing cavity; The cover plate (110) is provided with a liquid injection hole (111), and a receiving groove is provided on the top surface (116) of the cover plate (110), the receiving groove is located on the outer peripheral side of the liquid injection hole (111), and a blocking structure (114) is provided in the receiving groove, the blocking structure (114) divides the receiving groove into a first receiving groove (112) and a second receiving groove (113), the first receiving groove (112) is located between the liquid injection hole (111) and the second receiving groove (113), and a drainage groove (115) is provided on the blocking structure (114), the drainage groove (115) is connected with the first receiving groove (112) and the second receiving groove (113), respectively, and the bottom wall (1157) of the drainage groove (115) is higher than the bottom wall of the first receiving groove (112).

2. The single cell according to claim 1, characterized in that: The second receiving groove (113) is an annular receiving groove, and the drainage groove (115) includes a plurality of sub-drainage grooves (1151), two adjacent sub-drainage grooves (1151) are arranged at intervals, and each sub-drainage groove (1151) is connected to the first receiving groove (112) and the second receiving groove (113).

3. The single cell according to claim 1, characterized in that: The cover plate (110) has a thickness direction (z) and a first direction (x) and a second direction (y) perpendicular to the thickness direction (z), wherein the first direction (x) is perpendicular to the second direction (y); The single cell further comprises a pressure relief structure (120) and a terminal assembly (130), wherein the pressure relief structure (120) and the terminal assembly (130) are respectively arranged on the top surface (116) of the cover plate (110), and the terminal assembly (130) comprises a positive electrode column (131) and a negative electrode column (132), wherein the positive electrode column (131), the negative electrode column (132) and the pressure relief structure (120) are spaced apart and distributed along the first direction (x), and the injection hole (111) is located between the positive electrode column (131) and the pressure relief structure (120) or between the negative electrode column (132) and the pressure relief structure (120).

4. The single cell according to claim 1, characterized in that: The second receiving groove (113) includes a plurality of sub-receiving grooves (1131), and the plurality of sub-receiving grooves (1131) are arranged at intervals on the outer peripheral side of the injection hole (111); the drainage groove (115) includes a plurality of sub-drainage grooves (1151), and the plurality of sub-drainage grooves (1151) are arranged at intervals on the outer peripheral side of the injection hole (111), and each of the sub-receiving grooves (1131) is connected to the first receiving groove (112) through one sub-drainage groove (1151).

5. The single cell according to claim 4, characterized in that: The cover plate (110) has a thickness direction (z) and a projection plane perpendicular to the thickness direction (z); the plurality of sub-accommodating grooves (1131) include at least one first sub-accommodating groove (1132) and at least one second sub-accommodating groove (1133); the plurality of sub-drainage grooves (1151) include at least one first sub-drainage groove (1152) and at least one second sub-drainage groove (1153); each of the first sub-accommodating grooves (1132) is connected to the first accommodation groove (112) via one of the first sub-drainage grooves (1152). The second sub-receiving grooves (1133) are connected to the first receiving groove (112) through a second sub-drainage groove (1153), the volume of each first sub-receiving groove (1132) is V1, the volume of each second sub-receiving groove (1133) is V2, the orthographic projection area of ​​each first sub-drainage groove (1152) on the projection plane is S1, and the orthographic projection area of ​​each second sub-drainage groove (1153) on the projection plane is S2, satisfying: V1>V2, S1>S2.

6. The single cell according to claim 4, characterized in that: Each of the sub-accommodating grooves (1131) is in the shape of an arc, and each of the sub-drainage grooves (1151) is in the shape of an arc; and / or Each of the sub-accommodating grooves (1131) is rectangular, and each of the sub-drainage grooves (1151) is rectangular.

7. The single cell according to any one of claims 1 to 6, characterized in that: In the thickness direction (z) of the cover plate (110), the depth of the first receiving groove (112) and / or the second receiving groove (113) is H1, and the distance between the bottom wall (1157) of the drainage groove (115) and the bottom wall of the first receiving groove (112) or the bottom wall of the second receiving groove (113) is H2, satisfying: 0.05≤H2 / H1≤0.

75.

8. The single cell according to any one of claims 1 to 6, characterized in that: The thickness of the cover plate (110) is T, and in the thickness direction (z) of the cover plate (110), the depth of the first receiving groove (112) and / or the second receiving groove (113) is H1, satisfying: 0.2≤H1 / T≤0.

8.

9. The single cell according to any one of claims 1 to 6, characterized in that: A first boss (140) is provided on the bottom wall of the first receiving groove (112); the first boss (140) is arranged around the injection hole (111) to isolate the injection hole (111) from the first receiving groove (112); and a side of the first boss (140) away from the bottom wall of the first receiving groove (112) is flush with the top surface (116) of the cover plate (110).

10. The single cell according to any one of claims 1 to 6, characterized in that: A second boss (150) is provided on the top surface (116) of the cover plate (110), and the second boss (150) is arranged around the second receiving groove (113).

11. A battery pack, characterized in that: A single cell comprising the single cell according to any one of claims 1 to 10.

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