Battery cell and battery pack

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery cell and a battery pack, the battery cell comprises a shell, a pair of pole columns are arranged on the top wall, and a through groove is formed in the top wall; one end of each connecting piece is arranged on the lower side of the corresponding pole, the other end of each connecting piece is arranged opposite to the corresponding through groove, contact bosses are arranged at the positions, opposite to the poles, of the connecting pieces, the contact bosses abut against the corresponding poles, and welding blind grooves are formed in the lower sides of the contact bosses; the pole group is arranged in the shell, the pole group comprises two pole cores, and a plurality of pole lugs are arranged on the upper sides of the pole cores; the sealing plate is matched with the through groove, the sealing plate is welded with the groove wall of the through groove, and the plate surface of the sealing plate is provided with a liquid injection hole and an anti-explosion valve. The battery shell solves the problems that the pole column, the connecting piece and the pole lug are compact in structure in the longitudinal direction in the shell, so that the assembly operation is difficult, the battery core assembly efficiency is low, and the product capacity is limited.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery cell and a battery pack. Background Art

[0002] The power battery is the main power source of new energy vehicles and is responsible for providing continuous and stable electric energy for the vehicle. The power battery is composed of multiple battery cell units connected in series. Each battery cell structure includes a pole group inside and a housing. Positive and negative electrode tabs are provided on the pole group for leading out the current of the pole group, and a pole post is provided on the housing. The pole post is connected to the corresponding electrode tab through a connecting piece, thereby connecting the battery cell to the circuit.

[0003] In the related art, the electrode tab led out from the pole group is arranged on the lower side of the pole post. A connecting piece is arranged on the lower side of the pole post. The connecting piece is arranged in a U shape with two parallel connecting parts. The two connecting parts of the connecting piece are arranged vertically opposite to each other. One connecting part is connected to the bottom end of the pole post, and the other is connected to the electrode tab, thereby realizing the connection between the pole post and the pole group, and realizing the conduction between the pole post and the electrode tab through the transfer of the connecting piece.

[0004] However, in the above related art, since the pole post, the connecting piece, and the electrode tab are arranged in sequence in the longitudinal direction, and the longitudinal space inside the housing is limited, the operating space during the assembly process of the battery cell is very limited, affecting the assembly efficiency of the battery cell, and thus limiting the production capacity of the battery product. Summary of the Utility Model

[0005] In view of this, the utility model provides a battery cell and a battery pack to solve the problems that the pole post, the connecting piece, and the electrode tab are structurally compact in the longitudinal direction inside the housing, resulting in difficult assembly operations, slow assembly efficiency of the battery cell, and limited production capacity of the product.

[0006] In a first aspect, the utility model provides a battery cell, comprising: a housing, on the top wall of which a pair of pole posts are provided, and a through groove is provided between the pair of pole posts on the top wall of the housing; a pair of connecting pieces, one end of each of the pair of connecting pieces is arranged on the lower side of the corresponding pole post, and the other ends are respectively arranged opposite to the through groove. A contact boss is provided at a position where the connecting piece faces the pole post. The contact boss abuts against the corresponding pole post. A welding blind groove is provided at a position below the contact boss opposite to the pole post; a pole group, arranged inside the housing, the pole group includes two pole cores, a plurality of electrode tabs are provided on the upper side of the pole core, the electrode tabs extend towards the through groove and bend towards the connecting piece, and the bent part of the electrode tab abuts against the upper surface of the connecting piece; a sealing plate, adapted to the through groove, the sealing plate is welded to the groove wall of the through groove, and a liquid injection hole and an explosion-proof valve are arranged on the plate surface of the sealing plate.

[0007] Beneficial effects: By integrating the terminal post on the top wall of the housing, the integrity of the top of the battery cell is improved, and the structural stability is enhanced, enabling the battery cell to have better compressive resistance. Since the terminal post, tab and connecting piece are partially misaligned in the longitudinal direction of the housing, the structure occupies less longitudinal space inside the housing, saving the space inside the housing and thus improving the space utilization rate. At the same time, due to the expansion of the structure in the transverse direction, the operation and assembly are more convenient, reducing the operation difficulty. In addition, since the area of the explosion-proof valve on a battery cell with a certain volume is fixed, by providing a through groove on the top wall of the housing and arranging both the explosion-proof valve and the liquid injection hole on the sealing plate, the space on the top wall of the housing is saved, increasing the area where the through groove can be opened on the top wall of the housing, exposing the tabs and connecting pieces in a large area at the through groove, obtaining more operating space, further reducing the operating space for assembly operation and tab welding operation, and also enabling the tabs to have more sufficient bending space to obtain a smaller bending angle, avoiding the situation where the tabs are torn due to too small a bending angle or the height after bending is too high, which affects the longitudinal space utilization rate inside the housing. At the same time, a contact boss is provided on the column connecting part opposite to the lower end of the terminal post, and a welding blind groove is provided on the lower side of the column connecting part. When the staff welds the column connecting part and the terminal post by ultrasonic welding, penetration welding, etc., it can quickly and accurately locate the welding position. At the same time, the welding blind groove limits the welding head of the welding equipment, and the welding head is not easily displaced during the welding process, avoiding affecting the welding quality. In addition, the setting of the welding blind groove also reduces the thickness of the relative position between the connecting piece and the terminal post, improving the welding efficiency and welding quality, thereby making the battery cell assembly more efficient and increasing the product production capacity.

[0008] In an optional embodiment, the connecting piece includes a bending part, a column connecting part and an ear connecting part. The contact boss is arranged on the column connecting part. The ear connecting part is opposite to the through groove. Both the column connecting part and the ear connecting part are arranged parallel to the top wall of the housing. The ear connecting part and the column connecting part are connected by the bending part so that the column connecting part is higher than the ear connecting part.

[0009] Beneficial effects: Through the setting of the bending part, the column connecting part is slightly higher than the ear connecting part, thereby optimizing the structural layout. While enabling the column connecting part to be in close contact with the terminal post, a certain interval can also be formed between the ear connecting part and the lower surface of the top wall of the housing, avoiding the situation where the connecting piece is squeezed and rubbed against the top wall of the housing due to component size errors or assembly errors during the process, resulting in the failure of the insulation structure, short circuit and leakage of the housing.

[0010] In an optional embodiment, a pair of downwardly protruding limiting frames are provided on the lower side of the top wall of the housing. The whole formed by the bending part and the column connecting part is adapted to the limiting frames, and one end of the bending part connected to the column connecting part extends into the limiting frames.

[0011] Beneficial effects: The setting of the limiting frame facilitates the rapid positioning of the installation position of the connecting piece by the staff, improves the assembly efficiency, and can also limit the connecting piece during the subsequent welding process, ensuring the welding accuracy between the column connecting part of the connecting piece and the pole column, and improving the product quality.

[0012] In an alternative embodiment, a connection hole is provided at a position corresponding to the pole column on the top wall of the housing, the pole column passes through the connection hole, a first insulating member is provided on the lower side of the top wall of the housing, the first insulating member is arranged on the periphery of the connection hole, and the first insulating member is respectively located between the limiting frame and the bent portion, between the limiting frame and the column connecting portion, and between the ear connecting portion and the top wall of the housing, so as to separate the connecting piece from the top wall of the housing.

[0013] Beneficial effects: By arranging the first insulating member on the periphery of the connection hole, the first insulating member separates the limiting frame from the bent portion, the limiting frame from the connecting portion, and the ear connecting portion from the top wall of the housing respectively, so that while the connecting piece remains in contact with the pole column, the connecting piece is also prevented from contacting the top wall of the housing.

[0014] In an alternative embodiment, a second insulating member is provided on the lower surface of the top wall of the housing, the second insulating member is adapted to the lower surface of the top wall of the housing, and a relief groove is provided on the second insulating member, and the relief groove is arranged opposite to the two through grooves.

[0015] Beneficial effects: By arranging the second insulating member, the top wall of the housing is separated from the housing, and the top wall of the housing is separated from each structure on the lower side of the top wall of the housing. At the same time, the relief groove gives way to the through groove, so that the ear connecting portion can be exposed from the position of the through groove.

[0016] In an alternative embodiment, reinforcing ribs are provided on the second insulating member, the reinforcing ribs are located in the middle of the length direction of the top wall of the housing, the reinforcing ribs are arranged opposite to the explosion-proof valve, and a plurality of exhaust holes are provided on the reinforcing ribs.

[0017] Beneficial effects: By arranging the reinforcing ribs and making the reinforcing ribs be respectively arranged in the middle of the length direction of the top wall of the housing, the structure in the middle of the top wall of the housing can be strengthened, and support can be provided for the sealing plate when the sealing plate is deformed under pressure, improving the compressive capacity. By arranging the reinforcing ribs on both sides of the width direction of the top wall of the housing, interference with the pole ear welding operation is avoided. In addition, since the explosion-proof valve is integrated on the sealing plate and the reinforcing ribs are arranged opposite to the sealing plate, by providing the exhaust holes, it is prevented that the reinforcing ribs hinder the pressure relief and exhaust of the battery cell.

[0018] In an alternative embodiment, flanges are respectively provided at both ends of the second insulating member in the length direction of the top wall of the housing, and the flanges are arranged along the edge contour of the end of the top wall of the housing.

[0019] Beneficial effects: By providing a flanging, the flanging surrounds the contour of the edge of the top wall of the housing, supports and strengthens the position of the edge of the top wall of the housing, and further improves the strength of the housing.

[0020] In an alternative embodiment, the pole includes an integrally formed cylindrical portion and an extended portion. The extended portion is located above the cylindrical portion. The diameter of the cylindrical portion is less than or equal to the diameter of the connection hole, and the diameter of the extended portion is greater than the diameter of the connection hole. A first sealing ring is provided on the circumferential side of the pole. A part of the first sealing ring is located within the connection hole, and the other part is located between the extended portion and the upper surface of the top wall of the housing.

[0021] Beneficial effects: The extended portion of the pole is located outside the connection hole, and the cylindrical portion is located within the connection hole. A part of the first sealing ring is located within the connection hole, and the other part is located between the extended portion and the top wall of the housing. The extended portion and the upper surface of the top wall of the housing jointly clamp the first sealing ring. At the same time, the first sealing ring separates the extended portion from the top wall of the housing, thereby avoiding the situation of the housing being electrically leaked due to the short circuit between the pole and the top wall of the housing. And since the first sealing ring surrounds the circumferential side of the connection hole, it can also play a role in sealing the connection hole to prevent liquid from passing through the connection hole.

[0022] In an alternative embodiment, a second sealing ring is provided on the circumferential side of the pole. The second sealing ring is located within the connection hole and below the first sealing ring.

[0023] Beneficial effects: By providing the second sealing ring on the circumferential side of the pole and within the connection hole, the cylindrical portion of the pole is isolated from the connection hole, and the sealing effect at the connection hole is further improved.

[0024] In a second aspect, the present invention also provides a battery pack, including: a plurality of the above-mentioned battery cells.

[0025] Beneficial effects: The battery cell group in the battery pack is composed of the above-mentioned battery cells, which improves the space utilization rate within the housing, thereby improving the overall performance of the battery pack. And by changing the power connection structure between the tab and the pole, while optimizing the space utilization rate, it also reduces the difficulty of assembly operation and improves the production efficiency of the battery pack. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1Overall schematic diagram of a battery cell according to an embodiment of the present utility model;

[0028] Figure 2 Schematic diagram of a battery cell according to an embodiment of the present utility model for showing various structures at the inner top wall of the housing;

[0029] Figure 3 Cross-sectional schematic diagram of a battery cell according to an embodiment of the present utility model for showing the internal structure of the housing;

[0030] Figure 4 For Figure 3 Enlarged schematic diagram of part A in

[0031] Figure 5 Schematic diagram of a battery cell according to an embodiment of the present utility model for showing the state of the electrode core and the connecting piece before the ear is bent;

[0032] Figure 6 Schematic diagram of the state of the electrode core and the connecting piece after the ear of the battery cell according to an embodiment of the present utility model is bent.

[0033] Explanation of reference numerals:

[0034] 100, housing; 101, pole column; 1011, extension part; 1012, cylindrical part; 102, through groove; 103, connection hole; 104, limiting frame; 200, connecting piece; 201, contact boss; 202, welding blind groove; 203, column connection part; 204, ear connection part; 205, bending part; 300, electrode group; 301, ear; 400, sealing plate; 401, explosion-proof valve; 402, liquid injection hole; 501, first insulating part; 502, second insulating part; 5021, relief groove; 5022, reinforcing rib; 5023, exhaust hole; 5024, flanging; 601, first sealing ring; 602, second sealing ring. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] Next, in conjunction with Figures 1 to 6 , the embodiments of the present utility model will be described.

[0037] According to an embodiment of the present utility model, on the one hand, a battery cell is provided. Please refer to Figures 1 to 4, comprising: a housing 100, a pair of pole columns 101 are provided on the top wall, and a through groove 102 is provided between the pair of pole columns 101 on the top wall of the housing 100; a pair of connecting pieces 200, one end of each of the pair of connecting pieces 200 is provided on the lower side of the corresponding pole column 101, and the other ends are respectively arranged opposite to the through groove 102. A contact boss 201 is provided at the position where the connecting piece 200 faces the pole column 101, the contact boss 201 abuts against the corresponding pole column 101, and a welding blind groove 202 is provided at the position where the lower side of the contact boss 201 faces the pole column 101; a pole group 300, arranged inside the housing 100, the pole group 300 includes two pole cores, a plurality of pole tabs 301 are provided on the upper side of the pole cores, the pole tabs 301 extend towards the through groove 102 and bend towards the connecting piece 200, and the bent part of the pole tab 301 abuts against the upper surface of the connecting piece 200; a sealing plate 400, adapted to the through groove 102, the sealing plate 400 is welded to the groove wall of the through groove 102, and a liquid injection hole 402 and an explosion-proof valve 401 are provided on the plate surface of the sealing plate 400.

[0038] In this embodiment, by integrating the pole column 101 on the top wall of the housing 100, the integrity of the top of the battery cell is improved, the structural stability is enhanced, and the battery cell has better compressive resistance. Since the pole column 101, the pole ear 301, and the connecting piece 200 are partially misaligned in the longitudinal direction of the housing 100, the structure occupies less longitudinal space inside the housing 100, saving the space inside the housing 100 and thus improving the space utilization rate. At the same time, since the structure expands in the transverse direction, the operation and assembly operations are more convenient, reducing the operation difficulty. In addition, since the area of the explosion-proof valve 401 on a battery cell with a certain volume is fixed, by providing a through groove 102 on the top wall of the housing 100 and arranging both the explosion-proof valve 401 and the liquid injection hole 402 on the sealing plate 400, the space on the top wall of the housing 100 is saved, and the area where the through groove 102 can be opened on the top wall of the housing 100 is increased, so that the pole ear 301 and the connecting piece 200 are largely exposed at the through groove 102, obtaining more operation space, further reducing the operation space for the assembly operation and the welding operation of the pole ear 301, and also enabling the pole ear 301 to have a more sufficient bending space to obtain a smaller bending angle, avoiding the situation where the pole ear 301 is torn due to too small a bending angle or has a higher height after bending, which affects the longitudinal space utilization rate inside the housing 100. At the same time, a contact boss 201 is provided on the column connection part 203 opposite to the lower end of the pole column 101, and a welding blind groove 202 is provided on the lower side of the column connection part 203, which is convenient for the staff to quickly and accurately position the welding position when welding the column connection part 203 and the pole column 101 by ultrasonic welding, penetration welding, etc. At the same time, the welding blind groove 202 limits the welding head of the welding equipment, and the welding head is not easily displaced during the welding process, avoiding affecting the welding quality. In addition, the setting of the welding blind groove 202 also reduces the thickness of the relative position between the connecting piece 200 and the pole column 101, improving the welding efficiency and welding quality, so that the battery cell assembly is more efficient and the product production capacity is improved.

[0039] In the above embodiment, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6, the housing 100 and the terminal post 101 are configured and formed as a set during the production process, and there is no need for separate installation during the assembly operation. The staff installs the connecting piece 200 into the designated position on the inner top wall of the housing 100, and then welds the connecting piece 200 and the terminal post 101 through ultrasonic welding or penetration welding equipment. During welding, ensure that there is enough space for the connecting piece 200 to face the through groove 102. Then, the electrode group 300 is installed into the housing 100, so that the electrode tab 301 extends out of the housing 100 from the position of the through groove 102. Then, a bending operation is performed on the electrode tab 301 to fold and bend the electrode tab 301 by 90 degrees, attach it to the upper side of the connecting piece 200, and weld the electrode tab 301 and the connecting piece 200. Since the area of the through groove 102 is large, there is sufficient operating space for the welding operation and the preparation operation of the electrode tab 301, with low operation difficulty and high efficiency. After completing the welding of the electrode tab 301 and the connecting piece 200, the staff buckles the sealing plate 400 onto the through groove 102 and welds the sealing plate 400 to the top wall of the housing 100 to complete the assembly of the battery cell.

[0040] In one embodiment, please refer to Figures 1 to 4 , the connecting piece 200 includes a bending portion 205, a post connecting portion 203, and an ear connecting portion 204. The contact boss 201 is provided on the post connecting portion 203. The ear connecting portion 204 faces the through groove 102. Both the post connecting portion 203 and the ear connecting portion 204 are arranged parallel to the top wall of the housing 100. The ear connecting portion 204 and the post connecting portion 203 are connected by the bending portion 205 so that the post connecting portion 203 is higher than the ear connecting portion 204.

[0041] It should be noted that the bending portion 205, the post connecting portion 203, and the ear connecting portion 204 of the connecting piece 200 are integrally formed by stamping.

[0042] In this embodiment, through the setting of the bending portion 205, the post connecting portion 203 is slightly higher than the ear connecting portion 204, thereby optimizing the structural layout. While enabling the post connecting portion 203 to be in close contact with the terminal post 101, a certain interval can also be formed between the ear connecting portion 204 and the lower surface of the top wall of the housing 100, avoiding extrusion and friction between the connecting piece 200 and the top wall of the housing 100 due to component size errors or assembly errors during the process, resulting in the failure of the insulation structure, short circuit, and leakage of the housing 100.

[0043] In one embodiment, please refer to Figures 1 to 4 , there are a pair of downwardly protruding limiting frames 104 provided on the lower side of the top wall of the housing 100. The overall formed by the bending portion 205 and the post connecting portion 203 is adapted to the limiting frames 104, and one end of the bending portion 205 connected to the post connecting portion 203 extends into the limiting frames 104.

[0044] In this embodiment, the setting of the limiting frame 104 facilitates the staff to quickly locate the installation position of the connecting piece 200, improving the assembly efficiency. At the same time, it can also limit the connecting piece 200 during the subsequent welding process, ensuring the welding accuracy between the column connecting portion 203 of the connecting piece 200 and the pole column 101, and improving the product quality.

[0045] In one embodiment, please refer to Figures 1 to 4 , a connection hole 103 is provided at a position corresponding to the pole column 101 on the top wall of the housing 100. The pole column 101 passes through the connection hole 103. A first insulating member 501 is provided on the lower side of the top wall of the housing 100. The first insulating member 501 is arranged on the periphery of the connection hole 103, and the first insulating member 501 is respectively located between the limiting frame 104 and the bending portion 205, the limiting frame 104 and the column connecting portion 203, and the ear connecting portion 204 and the top wall of the housing 100, thereby separating the connecting piece 200 from the top wall of the housing 100.

[0046] In this embodiment, by arranging the first insulating member 501 on the periphery of the connection hole 103, the first insulating member 501 separates the limiting frame 104 from the bending portion 205, the limiting frame 104 from the connecting portion, and the ear connecting portion 204 from the top wall of the housing 100 respectively. Thus, while the connecting piece 200 remains in contact with the pole column 101, it also avoids the connecting piece 200 from contacting the top wall of the housing 100.

[0047] In one embodiment, please refer to Figures 1 to 4 , a second insulating member 502 is provided on the lower surface of the top wall of the housing 100. The second insulating member 502 is adapted to the lower surface of the top wall of the housing 100. A relief groove 5021 is formed in the second insulating member 502, and the relief groove 5021 is disposed opposite to the two through grooves 102.

[0048] In this embodiment, by arranging the second insulating member 502, the top wall of the housing 100 is separated from the housing 100, and the top wall of the housing 100 is separated from each structure on the lower side of the top wall of the housing 100. At the same time, the relief groove 5021 provides a clearance for the through groove 102, enabling the ear connecting portion 204 to be exposed from the position of the through groove 102.

[0049] In one embodiment, please refer to Figures 1 to 4 , the second insulating member 502 is provided with reinforcing ribs 5022. The reinforcing ribs 5022 are located in the middle of the length direction of the top wall of the housing 100. The reinforcing ribs 5022 are disposed opposite to the explosion-proof valve 401, and a plurality of exhaust holes 5023 are provided on the reinforcing ribs 5022.

[0050] In this embodiment, by providing the reinforcing ribs 5022 and arranging the reinforcing ribs 5022 in the middle of the top wall of the housing 100 in the length direction, the structure in the middle of the top wall of the housing 100 can be strengthened, and support can be provided to the sealing plate 400 when the sealing plate 400 is deformed under pressure, improving the compressive capacity. By arranging the reinforcing ribs 5022 on both sides of the top wall of the housing 100 in the width direction, interference with the welding operation of the tab 301 can be avoided. In addition, since the explosion-proof valve 401 is integrated on the sealing plate 400 and the reinforcing ribs 5022 are arranged opposite to the sealing plate 400, by providing the exhaust holes 5023, it is prevented that the reinforcing ribs 5022 obstruct the pressure relief and exhaust of the battery cell.

[0051] In one embodiment, please refer to Figures 1 to 4 , the second insulating member 502 is provided with flanges 5024 at both ends in the length direction of the top wall of the housing 100, and the flanges 5024 are arranged along the edge contour of the end of the top wall of the housing 100.

[0052] In this embodiment, by providing the flanges 5024, the flanges 5024 surround the contour of the edge of the top wall of the housing 100, supporting and strengthening the edge position of the top wall of the housing 100, and further improving the strength of the housing 100.

[0053] In some of the above embodiments, please refer to Figures 1 to 4 , the first insulating member 501 and the second insulating member 502 may be integrally formed. In some embodiments not shown, the first insulating member 501 and the second insulating member 502 may also be separately provided.

[0054] In one embodiment, please refer to Figure 3 and Figure 4 , the terminal post 101 includes a cylindrical portion 1012 and an extension portion 1011 formed integrally. The extension portion 1011 is located above the cylindrical portion 1012. The diameter of the cylindrical portion 1012 is less than or equal to the diameter of the connection hole 103, and the diameter of the extension portion 1011 is greater than the diameter of the connection hole 103. A first sealing ring 601 is provided on the circumferential side of the terminal post 101. A part of the first sealing ring 601 is located in the connection hole 103, and the other part is located between the extension portion 1011 and the upper surface of the top wall of the housing 100.

[0055] In this embodiment, the extension part 1011 of the pole column 101 is located outside the connection hole 103, and the columnar part 1012 is located inside the connection hole 103. A part of the first sealing ring 601 is located inside the connection hole 103, and the other part is located between the extension part 1011 and the top wall of the housing 100. The extension part 1011 and the upper surface of the top wall of the housing 100 jointly clamp the first sealing ring 601. At the same time, the first sealing ring 601 separates the extension part 1011 from the top wall of the housing 100, thereby avoiding the situation of the housing 100 being electrified due to the short circuit between the pole column 101 and the top wall of the housing 100. And because the first sealing ring 601 surrounds the circumferential side of the connection hole 103, it can also play a role in sealing the connection hole 103 to prevent liquid from passing through the connection hole 103.

[0056] In one embodiment, please refer to Figure 3 and Figure 4 , a second sealing ring 602 is provided on the circumferential side of the pole column 101. The second sealing ring 602 is located inside the connection hole 103 and below the first sealing ring 601.

[0057] In this embodiment, the second sealing ring 602 provided on the circumferential side of the pole column 101 and located inside the connection hole 103 isolates the columnar part 1012 of the pole column 101 from the connection hole 103, and further improves the sealing effect at the connection hole 103.

[0058] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, which includes a plurality of the above-mentioned battery cells.

[0059] In this embodiment, the battery cell group in the battery pack is composed of the above-mentioned battery cells, which improves the space utilization rate inside the housing 100, thereby improving the overall performance of the battery pack. And by changing the power connection structure between the tab 301 and the pole column 101, while optimizing the space utilization rate, it also reduces the difficulty of assembly operation and improves the production efficiency of the battery pack.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, on the top wall of which there are provided a pair of pole columns, and there is provided a through groove between the pair of pole columns on the top wall of the housing; A pair of connecting pieces, one end of each of the pair of connecting pieces is provided under the corresponding pole column, and the other ends are respectively arranged opposite to the through groove. A contact boss is provided at the position of the connecting piece opposite to the pole column. The contact boss abuts against the corresponding pole column, and a welding blind groove is provided at the position of the lower side of the contact boss opposite to the pole column; A pole group, arranged inside the housing, the pole group includes two pole cores, and a plurality of pole tabs are provided on the upper side of the pole cores. The pole tabs extend towards the through groove and bend towards the connecting piece, and the bent part of the pole tab abuts against the upper surface of the connecting piece; A sealing plate, adapted to the through groove, the sealing plate is welded to the groove wall of the through groove, and a liquid injection hole and an explosion-proof valve are provided on the plate surface of the sealing plate.

2. The battery cell according to claim 1, wherein The connecting piece includes a bent portion, a pole connection portion and an ear connection portion. The contact boss is arranged on the pole connection portion. The ear connection portion is opposite to the through groove. Both the pole connection portion and the ear connection portion are arranged parallel to the top wall of the housing. The ear connection portion and the pole connection portion are connected by the bent portion so that the pole connection portion is higher than the ear connection portion.

3. The battery cell according to claim 2, wherein A pair of downwardly protruding limiting frames are provided on the lower side of the top wall of the housing. The whole formed by the bent portion and the pole connection portion is adapted to the limiting frame, and one end of the bent portion connected to the pole connection portion extends into the limiting frame.

4. The battery cell according to claim 3, wherein Connection holes are provided at the positions on the top wall of the housing corresponding to the pole columns. The pole columns pass through the connection holes. A first insulating member is provided on the lower side of the top wall of the housing. The first insulating member is arranged on the periphery of the connection holes, and the first insulating member is respectively located between the limiting frame and the bent portion, the limiting frame and the pole connection portion, and the ear connection portion and the top wall of the housing, so as to separate the connecting piece from the top wall of the housing.

5. The battery cell according to claim 4, characterized in that, A second insulating member is provided on the lower surface of the top wall of the housing. The second insulating member is adapted to the lower surface of the top wall of the housing. A relief groove is provided on the second insulating member, and the relief groove is arranged opposite to the two through grooves.

6. The battery cell according to claim 5, characterized in that, Reinforcing ribs are provided on the second insulating member. The reinforcing ribs are located in the middle of the top wall of the housing in the length direction. The reinforcing ribs are arranged opposite to the explosion-proof valve, and a plurality of exhaust holes are provided on the reinforcing ribs.

7. The battery cell according to claim 6, wherein Flanges are respectively provided at both ends of the second insulating member in the length direction of the top wall of the housing. The flanges are arranged along the edge contour of the end of the top wall of the housing.

8. The battery cell according to claim 7, wherein The pole column includes an integrally formed cylindrical portion and an extended portion. The extended portion is located on the upper side of the cylindrical portion. The diameter of the cylindrical portion is less than or equal to the diameter of the connection hole, and the diameter of the extended portion is greater than the diameter of the connection hole. A first sealing ring is provided on the periphery of the pole column. A part of the first sealing ring is located in the connection hole, and the other part is located between the extended portion and the upper surface of the top wall of the housing.

9. The battery cell according to claim 8, wherein, A second sealing ring is provided on the periphery of the pole column. The second sealing ring is located in the connection hole and is located below the first sealing ring.

10. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 to 9.

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