Shell, battery cell monomer and battery cell monomer group

Abstract

The utility model discloses a shell, a battery cell monomer and a battery cell monomer group, and relates to the technical field of batteries. Wherein the shell is applied to a battery cell monomer, and the shell comprises a shell main body and a liquid injection hole; the shell body is provided with a first end and a second end which are oppositely arranged, the liquid injection hole is formed in the shell body, and the distance between the liquid injection hole and the first end or the second end is smaller than or equal to 6 mm. According to the battery cell monomer provided by the invention, the risk that the battery cell needs to be overturned before liquid injection can be reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a shell, a single battery cell and a single battery cell group. BACKGROUND

[0002] A conventional energy storage battery cell is long in size, and in the manufacturing of the battery cell, the battery cell is laid on one side for assembly. However, a conventional liquid injection hole is usually arranged on a top cover, and therefore, after the assembly of the battery cell is completed, the battery cell needs to be turned by 90 degrees to make the liquid injection hole face upward for liquid injection. The turning process is complicated, and in the turning process, the battery cell is prone to bumping. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the application is to provide a shell, a single battery cell and a single battery cell group, which can reduce the risk of turning the battery cell before liquid injection.

[0004] To achieve the above purpose, the shell is applied to the single battery cell, and the shell comprises a shell main body and a liquid injection hole. The shell main body has a first end and a second end arranged oppositely, and the liquid injection hole is arranged on the shell main body and is located at a distance of less than or equal to 6 mm from the first end or the second end.

[0005] In an embodiment, the shell main body comprises a first plate body and a second plate body arranged oppositely, and the liquid injection hole is arranged on the first plate body or the second plate body.

[0006] In an embodiment, the shell main body further comprises a third plate body and a fourth plate body arranged oppositely, and the third plate body and the fourth plate body are both connected between the first plate body and the second plate body.

[0007] The application further provides a single battery cell, which comprises a pole core assembly, a first cover plate, a second cover plate and the above-mentioned shell. The pole core assembly is arranged in the shell and is provided with a tab. The first cover plate is arranged on the first end, and the first cover plate is provided with a pole, and the tab is electrically connected with the pole. The second cover plate is arranged on the second end.

[0008] In an embodiment, the liquid injection hole is located at a distance of less than or equal to 6 mm from the second end.

[0009] In an embodiment, the single battery cell further comprises an exhaust valve, and the exhaust valve is arranged on the second cover plate.

[0010] In an embodiment, an exhaust passage is arranged between the second cover plate and the pole core assembly, and the exhaust valve is used to communicate the exhaust passage.

[0011] In an embodiment, the liquid injection hole at least partially communicates the exhaust passage.

[0012] In an embodiment, a support is arranged in the exhaust passage, one side of the support abutting against the second cover plate, and the other side abutting against the core assembly;

[0013] And / or, a part of the injection hole projects on the core assembly.

[0014] In an embodiment, the battery cell further comprises a sealing member, the sealing member sealing the injection hole;

[0015] And / or, the distance from the side of the core assembly close to the second cover plate to the second cover plate is less than or equal to 6mm.

[0016] The application further provides a battery cell group comprising the battery cell.

[0017] In an embodiment, the battery cell is provided with at least two;

[0018] The shell body comprises oppositely arranged first and second plate bodies, the injection hole is arranged on the first or second plate body; the shell body further comprises oppositely arranged third and fourth plate bodies, the third and fourth plate bodies are connected between the first and second plate bodies;

[0019] The third plate body of one of the two adjacent battery cells and the fourth plate body of the other battery cell are arranged face to face.

[0020] The technical solution of the application arranges the injection hole on the shell body, so that the injection hole is arranged on the side of the battery cell, and thus the battery cell can be directly injected through the injection hole after the assembly process in the side direction without rotating the shell. By arranging the shell body with a first end and a second end, and the distance between the injection hole and the first end or the second end is less than or equal to 6mm, the tab can be installed at the end away from the injection hole when the tab is installed, thereby reducing the risk of tab erosion. In addition, the injection hole and the end face of the shell body do not coincide, so that the injection hole is closer to the core assembly in the shell, thereby facilitating the timely infiltration of the electrolyte into the core assembly. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0022] Figure 1A structural schematic diagram of an electric cell monomer from a perspective provided in the present application;

[0023] Figure 2 A sectional view of an electric cell monomer provided in the present application;

[0024] Figure 3 A partial structural schematic diagram of an embodiment of an electric cell monomer group provided in the present application.

[0025] Explanation of reference numerals:

[0026] 100, electric cell monomer; 110, shell; 111, shell body; 111a, liquid injection hole; 1111, first plate body; 1112, second plate body; 1113, third plate body; 1114, fourth plate body; 112, first cover plate; 112a, pole column; 113, second cover plate; 110a, exhaust passage; 120, pole core assembly; 121, pole core body; 122, tab; 130, exhaust valve; 140, support; 150, sealing member;

[0027] 200, box.

[0028] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0031] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope claimed by the present application.

[0032] The conventional energy storage cell is long in size, and the cell is laid on one side for assembly process in the manufacturing of the cell. However, the conventional liquid injection hole is usually arranged on the top cover, so that after the assembly of the cell is completed, the cell needs to be turned by 90° to make the liquid injection hole upward for liquid injection. The turning process is complicated, and the cell is prone to bumping during the turning process.

[0033] In order to reduce the risk of turning the cell before liquid injection, please refer to Figure 1 and Figure 2 The present application proposes a shell 110.

[0034] In an embodiment of the present application, the shell 110 is applied to the cell monomer 100, and the shell 110 includes a shell main body 111 and a liquid injection hole 111a. The shell main body 111 has a first end and a second end arranged oppositely, and the liquid injection hole 111a is arranged on the shell main body 111 and has a distance from the first end or the second end less than or equal to 6mm.

[0035] The shell main body 111 of the shell 110 can be a cuboid, a cylinder or other shapes. The shell main body 111 of the shell 110 refers to the part that forms a cylindrical structure. When the shell 110 is a cuboid, the shell main body 111 includes a first plate body 1111, a third plate body 1113, a second plate body 1112 and a fourth plate body 1114 connected in sequence and enclosed, wherein the first plate body 1111 and the second plate body 1112 are arranged oppositely, and the third plate body 1113 and the fourth plate body 1114 are arranged oppositely. When the shell 110 is a cylinder, the shell main body 111 of the shell 110 is a cylindrical shape. The shell 110 has a first end and a second end, and the first end and the second end of the shell 110 can be provided with an open mouth, so as to facilitate the installation of other components of the cell monomer 100 in the shell 110.

[0036] The liquid injection hole 111a is a hole for a user to inject electrolyte into the shell 110. Specifically, the liquid injection hole 111a can be rectangular, circular, or other shapes. The liquid injection hole 111a can be less than or equal to 6 mm from the first end, or the liquid injection hole 111a can be less than or equal to 6 mm from the second end. It should be noted that the distance between the liquid injection hole 111a and the first end is the distance from the center of the liquid injection hole 111a to the end face of the first end; the distance between the liquid injection hole 111a and the second end is the distance from the center of the liquid injection hole 111a to the end face of the second end. By setting the distance between the liquid injection hole 111a and the first end or the second end to be less than or equal to 6 mm, that is, the size of L1 in Figure 2 Referring to the size of L1 in the middle is less than or equal to 6 mm, on the one hand, the liquid injection hole 111a can be closer to the core assembly 120 in the shell 110, thereby facilitating the timely infiltration of the electrolyte into the core assembly 120; on the other hand, the liquid injection hole 111a can be away from the end face of the shell body 111, thereby avoiding the liquid injection hole 111a facing the tab 122 as much as possible, thereby reducing the risk of electrolyte flushing the tab 122.

[0037] Further, the length of the shell body 111 ranges from no less than 300 mm to no more than 700 mm, the height of the shell body 111 ranges from no less than 100 mm to no more than 200 mm, and the thickness of the shell body 111 is greater than 10 mm. Specifically, the length of the shell body 111 can be 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 550 mm, 600 mm, 650 mm, or 700 mm, etc., the height of the shell body 111 can be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, or 200 mm, etc., and the thickness of the shell body 111 can be 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm, etc. The length direction of the shell body 111 refers to the direction from the first end of the shell body 111 to the second end of the shell body 111, the height direction of the shell body 111 and the thickness direction of the shell body 111 are both perpendicular to the length direction of the shell body 111, and the height direction of the shell body 111 is perpendicular to the thickness direction of the shell body 111. For example, the height direction of the shell body 111 is the direction from the first plate body 1111 to the second plate body 1112, so the height of the shell body 111 is the distance from the first plate body 1111 to the second plate body 1112; the thickness direction of the shell body 111 is the direction from the third plate body 1113 to the fourth plate body 1114, so the thickness of the shell body 111 is the distance from the third plate body 1113 to the fourth plate body 1114. Based on the above length range, in combination with the injection hole 111a being arranged on the shell body 111 and being less than or equal to 6 mm away from the first end or the second end, when the shell 110 is provided with the pole core assembly 120 and the tab 122 of the pole core assembly 120 is arranged at the end away from the injection hole 111a, the risk of electrolyte flushing the tab 122 can be further reduced. In addition, based on the above height range and thickness range, in combination with the arrangement of the injection hole 111a, the injection rate can be improved to shorten the time for electrolyte to infiltrate the pole core assembly 120 in the shell 110.

[0038] The technical solution of the present application sets the liquid injection hole 111a on the shell body 111, so that the liquid injection hole 111a is arranged on the side of the battery cell 100, and thus the battery cell 100 can be directly injected through the liquid injection hole 111a after the assembly process in the side direction without rotating the shell 110. By making the shell body 111 have a first end and a second end, and the distance between the liquid injection hole 111a and the first end or the second end is less than or equal to 6mm, the tab 122 can be installed at the end away from the liquid injection hole 111a when the tab 122 is installed, thereby reducing the risk of erosion of the tab 122. In addition, the liquid injection hole 111a is not coincident with the end face of the shell body 111, so that the liquid injection hole 111a is closer to the pole core assembly 120 in the shell 110, thereby facilitating the timely infiltration of the electrolyte into the pole core assembly 120.

[0039] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the shell body 111 includes a first plate body 1111 and a second plate body 1112 arranged opposite to each other, and the liquid injection hole 111a is arranged on the first plate body 1111 or the second plate body 1112.

[0040] The first plate body 1111 can be a flat plate or an arc-shaped plate. Similarly, the second plate body 1112 can be a flat plate or an arc-shaped plate.

[0041] By arranging the liquid injection hole 111a on the first plate body 1111 or the second plate body 1112, when the user places the battery cell 100 using the shell 110, the side wall provided with the liquid injection hole 111a can be arranged on the upper side, and the plate body opposite to the liquid injection hole 111a can support the entire shell body 111, thereby facilitating the injection of electrolyte and ensuring the stability of the electrolyte injection process.

[0042] Further, as Figure 1 shown, the shell body 111 further includes a third plate body 1113 and a fourth plate body 1114 arranged opposite to each other, and the third plate body 1113 and the fourth plate body 1114 are connected between the first plate body 1111 and the second plate body 1112.

[0043] Specifically, the third plate body 1113 can be a flat plate or an arc-shaped plate, and the fourth plate body 1114 can be a flat plate or an arc-shaped plate. It can be understood that the first plate body 1111, the second plate body 1112, the third plate body 1113, and the fourth plate body 1114 can all be flat plates, and the surface areas of the first plate body 1111 and the second plate body 1112 are equal, and the surface areas of the third plate body 1113 and the fourth plate body 1114 are equal, at this time, the shell body 111 is a long rectangular box with both ends open. Alternatively, the first plate body 1111 and the second plate body 1112 are both flat plates, and the third plate body 1113 and the fourth plate body 1114 are both arc-shaped plates, etc.

[0044] By connecting the third plate body 1113 and the fourth plate body 1114 between the first plate body 1111 and the second plate body 1112, the shell body 111 forms a cylindrical body with both ends open, thereby facilitating the shell body 111 to have a good protection effect on the pole core assembly 120 arranged therein, and facilitating the pole core assembly 120 to be installed in the shell body 111.

[0045] Further, as shown in Figure 1 , the surface areas of the third plate body 1113 and the fourth plate body 1114 are greater than the surface areas of the first plate body 1111 and the second plate body 1112.

[0046] By arranging the plate body provided with the liquid injection hole 111a at the top, when the third plate body 1113 and the fourth plate body 1114 can be placed laterally, the third plate body 1113 and the fourth plate body 1114 with larger surface areas can be placed laterally, thereby reducing the risk of deformation of the pole core assembly 120 when the pole core assembly 120 is installed in the shell body 111, and facilitating the pole core assembly 120 to be stably installed in the shell body 111.

[0047] The present application also proposes an electric core monomer 100, please combine with reference to Figure 1 and Figure 2 , the electric core monomer 100 includes a pole core assembly 120, a first cover plate 112, a second cover plate 113, and a shell 110. The specific structure of the shell 110 is referred to the above-mentioned embodiments. Since the electric core monomer 100 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the pole core assembly 120 is arranged in the shell 110 and is provided with a tab 122; the first cover plate 112 is arranged at the first end, and the first cover plate 112 is provided with a pole 112a, and the tab 122 is electrically connected with the pole 112a; the second cover plate 113 is arranged at the second end.

[0048] The pole core assembly 120 is an assembly mainly serving as an electrical connection in the battery cell 100. The pole core assembly 120 can include a pole core body 121 including a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. It can be understood that the shell 110 is usually made of metal. In order to reduce the risk of short circuiting of the positive electrode sheet and the negative electrode sheet in contact with the shell 110, the pole core assembly 120 can further include an insulating film wrapped outside the pole core body 121 to insulate the pole core body 121 from the shell 110. Therefore, when the electrolyte is injected into the shell 110 from the injection hole 111a, it is insulated by the insulating film, so that the case 110 can be reduced. The position of the shunt structure arranged opposite to the injection hole 111a. The pole core assembly 120 further includes a tab 122, and the tab 122 is provided with at least two, and the at least two tabs 122 are respectively connected with the positive electrode sheet and the negative electrode sheet.

[0049] The first cover plate 112 is a plate structure used to block the opening of the first end of the shell body 111, and the pole post 112a is arranged on the first cover plate 112, so as to facilitate the output of current to the outside through the pole post 112a. Specifically, the pole post 112a is provided with two, and the two pole posts 112a are arranged on the first cover plate 112, and the two pole posts 112a are respectively a positive pole post and a negative pole post. In addition, the first cover plate 112 in the present application can be welded or sealed and connected with the shell body 111 through a sealing ring.

[0050] The second cover plate 113 is a plate structure used to block the opening of the second end of the shell body 111. The second cover plate 113 can be welded or sealed and connected with the shell body 111 through a sealing ring. It can be understood that the pole post 112a is used to electrically connect with the tab 122 of the pole core assembly 120. Therefore, when the first cover plate 112 is provided with the pole post 112a, the first cover plate 112 is close to the tab 122, and the second cover plate 113 is away from the tab 122.

[0051] In addition, the tab 122 is also connected with the pole post 112a on the first cover plate 112 of the shell 110. Therefore, the side of the positive electrode sheet and the negative electrode sheet close to the tab 122 is usually not wrapped with an insulating film. When the conventional injection hole 111a for injecting electrolyte is arranged on the first cover plate 112, the injection hole 111a below is usually the tab 122 or the pole core body 121, which can cause the risk of electrolyte washing the tab 122 or the pole core body 121, thereby causing damage to the tab 122 or the pole core body 121. In addition, during assembly, the first cover plate 112 is usually laid horizontally, and the first cover plate 112 needs to be oriented upward during injection, so that the placement direction of the battery cell 100 during assembly is different from the injection direction during injection, and the placement direction of the battery cell 100 needs to be manually reversed repeatedly.

[0052] The first cover plate 112 and the second cover plate 113 are respectively arranged on the first end and the second end of the shell body 111, so that the first cover plate 112, the second cover plate 113 and the shell body 111 can jointly form a containing cavity to accommodate the pole core assembly 120 of the battery cell 100, thereby having a good protection effect on the pole core assembly 120. By arranging the liquid injection hole 111a on the shell body 111 and the pole post 112a on the first cover plate 112, on the one hand, the risk that the electrolyte directly flushes the pole lug 122 in the pole core assembly 120 through the hole on the first cover plate 112 during the liquid injection process can be reduced, and on the other hand, the placement direction of the battery cell 100 is repeatedly reversed manually, thereby simplifying the assembly process of the battery cell 100 and reducing the risk of collision of the battery cell 100.

[0053] Further, please refer to Figure 1 and Figure 2 , the distance between the liquid injection hole 111a and the second end is less than or equal to 6mm.

[0054] By arranging the liquid injection hole 111a on the shell body 111, and the distance between the liquid injection hole 111a and the second end is less than or equal to 6mm, the liquid injection hole 111a is arranged close to the second end, and the liquid injection hole 111a is far away from the pole lug 122, thereby reducing the risk of electrolyte flushing the pole lug 122 during the electrolyte injection process.

[0055] Further, as shown in Figure 2 , the battery cell 100 further comprises an exhaust valve 130, and the exhaust valve 130 is arranged on the second cover plate 113.

[0056] It can be understood that during the use of the battery cell 100, gas will be generated inside the shell 110 of the battery cell 100, and if the gas is not discharged in time, the risk of explosion will occur. In the present application, by arranging the exhaust valve 130 on the shell 110, when the internal gas of the battery reaches a preset pressure value, the exhaust valve 130 can be opened to reduce the risk of explosion of the battery cell 100. By arranging the exhaust valve 130 on the second cover plate 113, on the one hand, when the pressure in the shell 110 reaches a certain value, the exhaust valve 130 can be opened to achieve the effect of pressure relief, thereby reducing the risk of explosion of the battery cell 100; on the other hand, the exhaust valve 130 and the pole post 112a can be arranged on opposite sides of the shell 110, thereby achieving the effect of thermal-electric separation and reducing the risk of pollution of the pole post 112a by the electrolyte after the gas is discharged.

[0057] Please refer to Figure 2 , in some embodiments of the present application, an exhaust passage 110a is arranged between the second cover plate 113 and the pole core assembly 120, and the exhaust valve 130 communicates with the exhaust passage 110a.

[0058] By providing the exhaust passage 110a between the second cover plate 113 and the pole core assembly 120, the exhaust passage 110a is facilitated to approach and communicate with the exhaust valve 130 provided on the second cover plate 113, thereby achieving the effect of smooth exhaust.

[0059] Please refer to Figure 1 and Figure 2 In some embodiments of the present application, the liquid injection hole 111a at least partially communicates with the exhaust passage 110a.

[0060] Specifically, the liquid injection hole 111a can partially communicate with the exhaust passage 110a, or can fully communicate with the exhaust passage 110a.

[0061] By providing the liquid injection hole 111a at least partially communicating with the exhaust passage 110a, an avoidance space can be provided for the electrolyte injection path, thereby improving the liquid injection efficiency.

[0062] Please refer to Figure 1 and Figure 2 Based on the scheme of providing the exhaust passage 110a between the pole core assembly 120 and the second cover plate 113, further, in an embodiment of the present application, a support 140 is provided in the exhaust passage 110a, one side of the support 140 abutting against the second cover plate 113, and the other side abutting against the pole core assembly 120.

[0063] In order to reduce the corrosion effect of the electrolyte on the support 140, the support 140 can be made of a material resistant to electrolyte corrosion. In order not to affect the normal exhaust effect of the exhaust passage 110a, the support 140 can be disposed in a staggered manner with the exhaust valve 130. And the support 140 only fills part of the exhaust passage 110a.

[0064] By providing the support 140 in the exhaust passage 110a, and one side of the support 140 abutting against the second cover plate 113, and the other side abutting against the pole core assembly 120, the support stability of the pole core assembly 120 can be improved, and the risk of sliding of the pole core assembly 120 in the shell 110 can be reduced.

[0065] Please refer to Figure 2 Further, the distance from the side of the pole core assembly 120 close to the second cover plate 113 to the second cover plate 113 is less than or equal to 6mm.

[0066] Specifically, the distance from the side of the pole core assembly 120 close to the second cover plate 113 to the second cover plate 113 can be defined as L2 (please refer to Figure 2 for details), wherein L2 can be 1mm, 2mm, 3mm, 4mm, 5mm or 6mm, etc.

[0067] By setting the distance L2 from the side of the electrode core assembly 120 near the second cover plate 113 to the second cover plate 113 to be less than or equal to 6mm, on the one hand, a gap exists between the electrode core assembly 120 and the second cover plate 113, which facilitates the formation of the exhaust channel 110a, thereby allowing gas to flow through the exhaust channel 110a toward the exhaust valve 130 and achieve a pressure relief effect when the exhaust valve 130 is open; on the other hand, the gap between the electrode core assembly 120 and the second cover plate 113 is not too large, thereby making full use of the space inside the housing 110.

[0068] like Figure 2 As shown, in some embodiments of this application, a portion of the projection of the injection hole 111a falls onto the core assembly 120.

[0069] It should be noted that the electrode core assembly 120 typically includes an electrode core body 121 and an insulating film covering the electrode core body 121. Therefore, when a portion of the projection of the injection hole 111a falls onto the electrode core assembly 120, the electrolyte injected from the injection hole 111a will not cause significant damage to the electrode core body 121.

[0070] By projecting a portion of the injection hole 111a onto the core assembly 120, the flow path of the electrolyte can be shortened, thereby enabling the electrolyte injected from the injection hole 111a to flow to other areas within the housing 110 in a timely manner, thus improving the efficiency of electrolyte wetting around the core assembly 120.

[0071] like Figure 1 As shown, in some embodiments of this application, the battery cell 100 further includes a seal 150, which seals the liquid injection hole 111a.

[0072] By sealing the injection port 111a with the seal 150, the risk of electrolyte leakage from the injection port 111a can be reduced.

[0073] Specifically, the seal 150 can be in the form of a sheet, a column, or other shapes. It can seal the injection hole 111a by welding it to the housing 110, or by applying sealant to seal the injection hole 111a.

[0074] Furthermore, to improve sealing stability, the seal 150 is welded to the housing 110. This arrangement reduces the risk of seal failure in the battery cell 100 due to impacts or shaking during transportation or use.

[0075] The application further provides a battery cell group comprising the battery cell 100. The battery cell group adopts all the technical solutions of the above-mentioned embodiments, and thus has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0076] As shown in Figure 3 The battery cell group can further comprise a box 200, and the box 200 is internally provided with a plurality of battery cells 100. The box 200 is used for providing a containing space for the battery cells 100, and the box 200 can adopt various structures. In some embodiments, the box 200 can comprise a first part and a second part, the first part and the second part are mutually covered, and the first part and the second part jointly define a containing space for containing the battery cells 100. The second part can be a hollow structure with one end being open, and the first part can be a plate-shaped structure, the first part is covered on the open side of the second part, so that the first part and the second part jointly define the containing space; the first part and the second part can also be hollow structures with one side being open, and the open side of the first part is covered on the open side of the second part. Of course, the box 200 can have various shapes, such as a cylinder, a cuboid, etc.

[0077] When the battery cell 100 is provided with at least two, the plurality of battery cells 100 can be connected in series, connected in parallel or connected in series-parallel. The series-parallel connection means that there are both series connection and parallel connection among the plurality of battery cells 100. The plurality of battery cells 100 can be directly connected in series, connected in parallel or connected in series-parallel, and then the whole formed by the plurality of battery cells 100, i.e. a battery module, is contained in the box 200.

[0078] In an embodiment of the application, the battery cell 100 is provided with at least two; the shell main body 111 comprises a first plate body 1111 and a second plate body 1112 which are oppositely arranged, and the liquid injection hole 111a is arranged on the first plate body 1111 or the second plate body 1112; the shell main body 111 further comprises a third plate body 1113 and a fourth plate body 1114 which are oppositely arranged, and the third plate body 1113 and the fourth plate body 1114 are both connected between the first plate body 1111 and the second plate body 1112; the third plate body 1113 of one of the adjacent two battery cells 100 is arranged face to face with the fourth plate body 1114 of the other of the adjacent two battery cells 100.

[0079] In this way, the plate body provided with the liquid injection hole 111a can be arranged upward, i.e. the plate body provided with the liquid injection hole 111a is located at the top of the shell main body 111, so that the user can directly inject the electrolyte into the shell main body 111 through the liquid injection hole 111a, without the need to turn over the battery cell group, thereby simplifying the assembly process and reducing the risk of bumping of the battery cell group.

[0080] The above merely describes exemplary embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made based on the technical concept of the present application, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A housing, characterized in that, Applied to a single battery cell, the housing includes: A housing body having a first end and a second end disposed opposite to each other; The liquid injection hole is located on the main body of the housing, and the distance between it and the first end or the second end is less than or equal to 6 mm.

2. The housing as claimed in claim 1, characterized in that, The main body of the shell includes a first plate and a second plate disposed opposite to each other, and the liquid injection hole is provided on the first plate or the second plate.

3. The housing as described in claim 2, characterized in that, The main body of the housing also includes a third plate and a fourth plate disposed opposite to each other, and the third plate and the fourth plate are both connected between the first plate and the second plate.

4. A single battery cell, characterized in that, The device includes a core assembly, a first cover plate, a second cover plate, and a housing as described in any one of claims 1 to 3. The core assembly is disposed within the housing and has an electrode tab. The first cover plate is disposed on the first end and has an electrode post on the first cover plate. The electrode tab is electrically connected to the electrode post. The second cover plate is disposed on the second end.

5. The single cell as described in claim 4, characterized in that, The distance between the injection hole and the second end is less than or equal to 6 mm.

6. The single cell as described in claim 5, characterized in that, The battery cell also includes an exhaust valve, which is located on the second cover plate; an exhaust channel is provided between the second cover plate and the electrode assembly, and the exhaust valve is connected to the exhaust channel.

7. The single cell as described in claim 6, characterized in that, The injection hole is at least partially connected to the venting channel.

8. The single cell as described in claim 7, characterized in that, The exhaust channel is provided with a support member, one side of which abuts against the second cover plate, and the other side abuts against the pole core assembly; And / or, a portion of the projection of the injection hole falls onto the electrode core assembly.

9. The single cell as described in claim 4, characterized in that, The battery cell also includes a sealing element that seals the liquid injection hole; And / or, the distance from the side of the core assembly closest to the second cover plate to the second cover plate is less than or equal to 6 mm.

10. A battery cell assembly, characterized in that, Includes the battery cell as described in any one of claims 4 to 9.

11. The cell assembly as described in claim 10, characterized in that, The battery cell unit has at least two cells; The main body of the housing includes a first plate and a second plate disposed opposite to each other, and the liquid injection hole is disposed on the first plate or the second plate; the main body of the housing also includes a third plate and a fourth plate disposed opposite to each other, and the third plate and the fourth plate are both connected between the first plate and the second plate; The third plate of one of two adjacent battery cells is arranged face-to-face with the fourth plate of the other.

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