Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack, and the battery cell mainly comprises a shell, a pair of pole columns and a pair of connecting sheets. A pair of mounting holes and a pair of first through holes are formed in one side of the shell at intervals in the length direction, the pair of first through holes are located between the pair of mounting holes, and a plurality of pole groups and a plurality of pairs of pole lugs in one-to-one correspondence with the pole groups are arranged in the shell; the pair of poles are respectively arranged on the pair of mounting holes, and axial through holes are formed in the poles; the pair of connecting pieces are arranged on the pole groups and on the inner side of the shell, one end of each connecting piece is provided with a protruding part, the side wall of each protruding part is connected with the hole wall of the corresponding axial through hole, and the other opposite end of each connecting piece extends to the corresponding first through hole and is connected with the corresponding tab. According to the utility model, the axial through hole is formed in the pole, the protruding part is arranged at one end of the connecting piece, and the side wall of the protruding part is connected with the hole wall of the axial through hole, so that the mounting space of the connecting piece and the pole is saved, and the space utilization rate of the battery cell is improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, battery packs are increasingly used in various new energy products. In a battery pack, a pole column is connected to an electrode tab of a battery cell through a connecting piece to achieve electrical conduction.

[0003] Since the connecting piece and the electrode tab need to be bent and connected, and the connecting piece, the pole column and the electrode tab are usually located on the same vertical plane, a relatively large thickness space needs to be occupied, resulting in low space utilization rate of the battery cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell and a battery pack to solve the problem that the existing connecting piece connecting the pole column and the electrode tab needs to occupy a relatively large thickness space, resulting in low space utilization rate of the battery cell.

[0005] In a first aspect, the utility model provides a battery cell, comprising:

[0006] A housing, on one side of which there are provided a pair of mounting holes and a pair of first through holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, and there are provided a plurality of pole groups and a plurality of pairs of electrode tabs corresponding to the pole groups one by one inside the housing;

[0007] A pair of pole columns, respectively arranged on the pair of mounting holes, and the pole columns are provided with axial through holes;

[0008] A pair of connecting pieces, arranged on the plurality of pole groups and inside the housing, one end of the connecting piece is provided with a protruding portion, the side wall of the protruding portion is connected to the hole wall of the axial through hole, and the opposite end of the connecting piece extends to the first through hole and is connected to the electrode tab.

[0009] Advantageous Effects: By providing an axial through hole on the pole column and a protruding portion at one end of the connecting piece, and connecting the side wall of the protruding portion to the hole wall of the axial through hole, the utility model saves the installation space between the connecting piece and the pole column and improves the space utilization rate of the battery cell. The first through holes provided on the housing can leave installation space for the connecting piece and the electrode tab, reduce the number of bends of the connecting piece and the electrode tab, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell.

[0010] In an optional embodiment, the side of the connecting piece facing the pole column extends along the hole wall of the axial through hole to form the protruding portion, and the protruding portion is provided with a cavity.

[0011] Beneficial effects: The protruding part is formed by extending the connecting piece and extends along the wall of the axial through-hole. The cooperation between the protruding part and the axial through-hole can be used to achieve auxiliary positioning. The protruding part is provided with a cavity, which reduces the weight and is beneficial to the lightweight design.

[0012] In an alternative embodiment, the upper surface of the protruding part does not exceed the upper surface of the axial through-hole.

[0013] Beneficial effects: The upper surface of the protruding part does not exceed the upper surface of the axial through-hole, so as to prevent the protruding part from occupying the height space of the battery core and affecting the normal use of the pole column.

[0014] In an alternative embodiment, a plurality of pads are provided at the upper end of the part where the connecting piece extends to the first through-hole, and one end of the tab is bent and welded to the pads one by one.

[0015] Beneficial effects: After the tab is bent, it is directly welded to the pads on the connecting piece, which can reduce the number of welding and bending times between the connecting piece and the tab, thereby improving the production efficiency of the battery core.

[0016] In an alternative embodiment, the pole column includes a pole column body, and riveting parts and limiting parts located at the upper and lower ends of the pole column body. A sealing ring is provided between the pole column body and the mounting hole; the riveting parts and the limiting parts extend outside the mounting hole and enclose a mounting space with the pole column body;

[0017] The battery core further includes: a pair of insulating rubber rings and an insulating plate. The pair of insulating rubber rings are respectively sleeved outside the pair of pole column bodies. The insulating plate is arranged inside the housing. The insulating plate is provided with a second through-hole, and the sealing ring passes through the second through-hole;

[0018] The riveting parts and the limiting parts clamp the insulating rubber rings, the sealing ring and the peripheral wall of the second through-hole at the mounting space.

[0019] Beneficial effects: The riveting parts and the limiting parts at the upper and lower ends of the pole column body clamp the insulating rubber rings, the sealing ring and a part of the insulating plate at the mounting space, without other fixing and positioning structures, which simplifies the housing structure of the battery core, facilitates installation and use, thereby improving the production efficiency of the battery core and also improving the space utilization rate of the battery core.

[0020] In an alternative embodiment, a first step is formed on the outer periphery of the upper end of the pole column body, and the first step serves as the riveting part. A second step is formed on the outer periphery of the lower end of the pole column body, and the second step serves as the limiting part. The bottom surface of the riveting part, the outer periphery of the pole column body and the top surface of the limiting part form a mounting groove, and the mounting groove serves as the mounting space.

[0021] Beneficial effects: Before installing the insulating rubber ring, the sealing ring and the insulating plate, the first step extends along the height direction of the pole column body. After installing the insulating rubber ring, the sealing ring and the insulating plate, the first step is bent so that it extends along the outer circumference of the pole column body, thereby clamping the insulating rubber ring, the sealing ring and the insulating plate between the first step and the second step. The connection is firm, which can effectively ensure the structural strength and the structure is simple.

[0022] In an alternative embodiment, the insulating rubber ring is arranged between the riveting part and the housing, and the sealing ring is sleeved outside the pole column body and arranged between the insulating rubber ring and the limiting part.

[0023] Beneficial effects: The insulating rubber ring is located at the upper end of the sealing ring and plays the role of insulation and sealing. The sealing ring is arranged between the insulating rubber ring and the limiting part, which can further improve the sealing effect.

[0024] In an alternative embodiment, the insulating plate is provided with a boss. The boss is axially perforated to form the second through hole. The top of the boss abuts against the housing, and the bottom of the boss abuts against the limiting part.

[0025] Beneficial effects: The top of the boss of the insulating plate abuts against the housing, and the bottom of the boss abuts against the limiting part, that is, the boss is clamped between the housing and the limiting part. The boss can play a positioning role, improve the structural stability of the insulating plate, and does not occupy extra space.

[0026] In an alternative embodiment, the housing is further provided with a pair of sealing plates for respectively sealing a pair of the first through holes and a liquid injection hole located between the pair of the first through holes.

[0027] Beneficial effects: The sealing plate is used to seal the first through hole, and the liquid injection hole is used to inject electrolyte.

[0028] In a second aspect, the present invention further provides a battery pack, including: a plurality of the above-mentioned battery cells.

[0029] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, that is, by opening an axial through hole in the pole column and providing a protruding part at one end of the connecting piece, the side wall of the protruding part is connected to the hole wall of the axial through hole to save the installation space between the connecting piece and the pole column and improve the space utilization rate of the battery cell. The first through hole provided on the housing can leave the installation space for the connecting piece and the pole ear, reduce the bending times of the connecting piece and the pole ear, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell. Description of the Drawings

[0030] 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.

[0031] Figure 1 Schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0032] Figure 2 Cross-sectional view of a battery cell according to an embodiment of the present invention;

[0033] Figure 3 For Figure 2 The enlarged view at A in

[0034] Figure 4 Partial structural schematic diagram of the tab of a battery cell before bending according to an embodiment of the present invention;

[0035] Figure 5 Partial structural schematic diagram of a battery cell according to an embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 1. Housing; 101. First through hole; 2. Electrode group; 3. Tab; 4. Terminal; 401. Terminal body; 402. Riveting part; 403. Limiting part; 5. Connecting piece; 501. Protruding part; 502. Pad; 6. Sealing ring; 7. Insulating rubber ring; 8. Insulating plate; 801. Boss; 9. Sealing plate; 10. Liquid injection hole. Specific embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0039] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 5 , describing the embodiments of the present invention.

[0040] According to the embodiments of the present invention, on the one hand, as shown in Figure 1 and Figure 2As shown, a battery cell is provided, mainly including: a housing 1, a pair of pole columns 4, and a pair of connecting pieces 5. On one side of the housing 1, a pair of mounting holes and a pair of first through holes 101 are provided at intervals along the length direction. The pair of first through holes 101 are located between the pair of mounting holes. Inside the housing 1, a plurality of electrode groups 2 and multiple pairs of electrode tabs 3 corresponding to the electrode groups 2 one by one are provided. The pair of pole columns 4 are respectively arranged on the pair of mounting holes, and the pole columns 4 are provided with axial through holes. The pair of connecting pieces 5 are arranged on the plurality of electrode groups 2 and on the inner side of the housing 1. One end of the connecting piece 5 is provided with a protruding portion 501, and the side wall of the protruding portion 501 is connected to the hole wall of the axial through hole. The relatively other end of the connecting piece 5 extends to the first through hole 101 and is connected to the electrode tab 3.

[0041] In the battery cell provided by the embodiment of the present invention, by providing an axial through hole in the pole column 4 and providing a protruding portion 501 at one end of the connecting piece 5, the side wall of the protruding portion 501 is connected to the hole wall of the axial through hole of the pole column 4, so as to save the installation space between the connecting piece 5 and the pole column 4 and improve the space utilization rate of the battery cell. The provision of the first through hole 101 on the housing 1 can leave an installation space for the connecting piece 5 and the electrode tab 3, reduce the bending times of the connecting piece 5 and the electrode tab 3, thereby reducing the installation thickness and further improving the space utilization rate of the battery cell.

[0042] Specifically, the length direction of the housing 1 is as Figure 1 shown by the arrow L in Figure 4 and Figure 5 As shown, side plates are provided around the housing 1, a bottom plate is provided at the bottom, and a top plate is provided at the top. The four side plates, the top plate, and the bottom plate are integrally formed and enclose a cavity. A pair of first through holes 101 and a pair of pole columns 4 are provided at intervals on the top plate. The plurality of electrode groups 2 are stacked and arranged in the cavity. Multiple pairs of electrode tabs 3 are provided on one side of the plurality of electrode groups 2 close to the pole column 4. Each electrode group 2 is provided with a positive electrode tab and a negative electrode tab. Since the pole column 4 is arranged on the housing 1 and the electrode tab 3 is installed at the first through hole 101, the electrode tab 3 and the pole column 4 are arranged in a staggered manner, so that the installation thickness can be reduced and the space utilization rate can be improved.

[0043] The pair of pole columns 4 include a positive pole column and a negative pole column. The connecting pieces 5 correspond to the pole columns 4 one by one. One of the connecting pieces 5 connects the positive pole column and the positive electrode tabs of the plurality of electrode groups 2, and the other connecting piece 5 connects the negative pole column and the negative electrode tabs of the plurality of electrode groups 2. The connecting piece 5 needs to be conductive to realize the electrical connection between the electrode tab 3 and the pole column 4. A gap is left between the two connecting pieces 5 to prevent the positive pole column and the negative pole column from being short-circuited. The bottom of the connecting piece 5 is arranged on the top of the electrode group 2, and the electrode tab 3 is bent along the width direction of the housing 1 and then attached to the top surface of the connecting piece 5 to reduce the size of the first through hole 101 and improve the structural strength of the housing 1.

[0044] It should be noted that the embodiment of the present invention does not limit the number of electrode groups 2 in the battery cell, and two, three, or more than three can be selected. Exemplarily, asFigure 4 and Figure 5 As shown in Figure 5 , two electrode groups 2 are provided. Each of the two electrode groups 2 is provided with a positive electrode tab and a negative electrode tab. After being bent, the two positive electrode tabs are welded to a connecting piece 5, and after being bent, the two negative electrode tabs are welded to another connecting piece 5.

[0045] In one embodiment, as Figure 3 shown in Figure 3 , one side of the connecting piece 5 facing the pole column 4 extends along the hole wall of the axial through hole to form a protruding portion 501. The side wall of the protruding portion 501 is welded to the hole wall of the axial through hole. The protruding portion 501 is provided with a cavity. The protruding portion 501 is formed by extending from the connecting piece 5 and extends along the hole wall of the axial through hole, and the cooperation between the protruding portion 501 and the axial through hole can be used to achieve auxiliary positioning. The protruding portion 501 is provided with a cavity, which reduces the weight and is beneficial to the lightweight design.

[0046] Further, in one embodiment, the upper surface of the protruding portion 501 does not exceed the upper surface of the axial through hole, so as to prevent the protruding portion 501 from occupying the height space of the battery cell and affecting the normal use of the pole column 4.

[0047] In one embodiment, as Figure 5 shown in Figure 5 , a plurality of pads 502 are provided at the upper end of the portion where the connecting piece 5 extends to the first through hole 101. One end of the tab 3 is bent and welded to the pads 502 one by one. After being bent, the tab 3 is directly welded to the pads 502 on the connecting piece 5, which can reduce the number of welding and bending times between the connecting piece 5 and the tab 3, thereby improving the production efficiency of the battery cell. The welding can be realized by conventional welding processes such as laser welding or ultrasonic welding.

[0048] In one embodiment, as Figure 3 shown in Figure 3 , the pole column 4 includes a pole column body 401 and riveting portions 402 and limiting portions 403 located at the upper and lower ends of the pole column body 401. A sealing ring 6 is provided between the pole column body 401 and the mounting hole. The riveting portions 402 and the limiting portions 403 extend outside the mounting hole and enclose a mounting space with the pole column body 401.

[0049] Further, the battery cell further includes: a pair of insulating rubber rings 7 and an insulating plate 8. The pair of insulating rubber rings 7 are respectively sleeved outside a pair of pole column bodies 401. The insulating plate 8 is arranged inside the housing 1. The insulating plate 8 is provided with a second through hole, and the sealing ring 6 is passed through the second through hole. The riveting portions 402 and the limiting portions 403 clamp the insulating rubber rings 7, the sealing ring 6 and the peripheral wall of the second through hole at the mounting space.

[0050] The riveting parts 402 and the limiting parts 403 at the upper and lower ends of the pole column body 401 clamp the insulating rubber ring 7, the sealing ring 6 and a part of the insulating plate 8 at the installation space. Without other fixing and positioning structures, the structure of the cell housing 1 is simplified, which is convenient for installation and use, thus improving the production efficiency of the cell and also improving the space utilization rate of the cell. The insulating rubber ring 7 can play both insulating and sealing effects. The setting of the sealing ring 6 can further ensure the sealing performance of the pole column 4. The insulating plate 8 is used to prevent the connection short circuit between the positive pole column and the negative pole column.

[0051] It should be noted that the embodiment of the present invention does not limit the material of the sealing ring 6. For example, the sealing ring 6 can adopt conventional sealing rings such as rubber sealing rings and silicone rubber sealing rings. In addition, the materials of the insulating rubber ring 7 and the insulating plate 8 are not limited either. For example, both the insulating rubber ring 7 and the insulating plate 8 can adopt plastic parts.

[0052] In one embodiment, a first step is formed on the outer periphery of the upper end of the pole column body 401, and the first step serves as the riveting part 402. A second step is formed on the outer periphery of the lower end of the pole column body 401, and the second step serves as the limiting part 403. The bottom surface of the riveting part 402, the outer periphery of the pole column body 401 and the top surface of the limiting part 403 form an installation groove, and the installation groove serves as the installation space.

[0053] Specifically, the pole column body 401 can be cylindrical. Both the first step and the second step can be selected as circular bosses, and an annular installation groove is formed at the pole column body 401. Before installing the insulating rubber ring 7, the sealing ring 6 and the insulating plate 8, the first step extends along the height direction of the pole column body 401. After installing the insulating rubber ring 7, the sealing ring 6 and the insulating plate 8, the first step is bent so that it extends along the outer periphery of the pole column body 401, thereby clamping the insulating rubber ring 7, the sealing ring 6 and the insulating plate 8 between the first step and the second step. The connection is firm, which can effectively ensure the structural strength and the structure is simple.

[0054] The top and bottom directions of the embodiment of the present invention are as Figure 3 shown. The height direction of the pole column body 201 is also the Figure 3 direction where the top and bottom arrows are located in

[0055] In one embodiment, as Figure 3 shown, the insulating rubber ring 7 is arranged between the riveting part 402 and the housing 1, and the sealing ring 6 is sleeved outside the pole column body 401 and arranged between the insulating rubber ring 7 and the limiting part 403. The insulating rubber ring 7 is located above the sealing ring 6 and plays the roles of insulation and sealing. The sealing ring 6 is arranged between the insulating rubber ring 7 and the limiting part 403, which can further improve the sealing effect.

[0056] In one embodiment, as Figure 3As shown, the insulating plate 8 is provided with a boss 801. The boss 801 is axially perforated to form a second through hole. The top of the boss 801 abuts against the housing 1, and the bottom of the boss 801 abuts against the limiting portion 403. That is, the boss 801 is clamped between the housing 1 and the limiting portion 403. The boss 801 can play a positioning role, improving the structural stability of the insulating plate 8 without occupying extra space.

[0057] In one embodiment, as Figure 1 and Figure 2 shown, the housing 1 is further provided with a pair of sealing plates 9 for respectively sealing a pair of first through holes 101 and a liquid injection hole 10 located between the pair of first through holes 101. The sealing plate 9 is used to seal the first through hole 101, and the liquid injection hole 10 is used to inject electrolyte. The pole column 4, the insulating rubber ring 7, the sealing ring 6, the sealing plate 9 and the insulating plate 8 are all arranged on the housing 1, having good structural strength.

[0058] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, mainly including: a plurality of battery cells.

[0059] Since the battery pack includes battery cells, it has the same effect as the battery cells, that is, by opening an axial through hole on the pole column 4 and providing a protruding portion 501 at one end of the connecting piece 5, the side wall of the protruding portion 501 is connected to the hole wall of the axial through hole of the pole column 4 to save the installation space between the connecting piece 5 and the pole column 4 and improve the space utilization rate of the battery cells. The first through hole 101 provided on the housing 1 can leave the installation space for the connecting piece 5 and the pole ear 3, reduce the bending times of the connecting piece 5 and the pole ear 3, thereby reducing the installation thickness and further improving the space utilization rate of the battery cells.

[0060] Specifically, the plurality of battery cells can be connected in series, in parallel, or in a form of series-parallel combination. In this regard, the embodiments of the present invention do not impose many restrictions.

[0061] 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 one side of which there are provided a pair of mounting holes and a pair of first through holes at intervals along the length direction, the pair of first through holes being located between the pair of mounting holes, and a plurality of electrode groups and a plurality of pairs of tab ears corresponding to the electrode groups one by one are provided inside the housing; A pair of electrode terminals, respectively provided on the pair of mounting holes, and the electrode terminals are provided with axial through holes; A pair of connecting pieces, provided on the plurality of electrode groups and inside the housing, one end of the connecting piece is provided with a protruding portion, the side wall of the protruding portion is connected to the hole wall of the axial through hole, and the opposite end of the connecting piece extends to the first through hole and is connected to the tab ear.

2. The battery cell according to claim 1, characterized in that, The connecting piece extends along the hole wall of the axial through hole on the side facing the electrode terminal to form the protruding portion, and the protruding portion is provided with a cavity.

3. The battery cell according to claim 2, wherein The upper surface of the protruding portion does not exceed the upper surface of the axial through hole.

4. The battery cell according to claim 1, characterized in that, A plurality of pads are provided at the upper end of the part where the connecting piece extends to the first through hole, and one end of the tab ear is bent and welded to the pads one by one.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The electrode terminal includes an electrode terminal body, a riveting portion and a limiting portion located at the upper and lower ends of the electrode terminal body, and a sealing ring is provided between the electrode terminal body and the mounting hole; the riveting portion and the limiting portion extend outside the mounting hole, and an installation space is formed by surrounding the electrode terminal body; The battery cell further includes: a pair of insulating rubber rings and an insulating plate, the pair of insulating rubber rings are respectively sleeved outside the pair of electrode terminal bodies, the insulating plate is provided inside the housing, the insulating plate is provided with a second through hole, and the sealing ring is inserted through the second through hole; The riveting portion and the limiting portion clamp the insulating rubber ring, the sealing ring and the peripheral wall of the second through hole at the installation space.

6. The battery cell according to claim 5, characterized in that, A first step is formed on the outer periphery of the upper end of the electrode terminal body, and the first step serves as the riveting portion. A second step is formed on the outer periphery of the lower end of the electrode terminal body, and the second step serves as the limiting portion. The bottom surface of the riveting portion, the outer periphery of the electrode terminal body and the top surface of the limiting portion form an installation groove, and the installation groove serves as the installation space.

7. The battery cell according to claim 5, wherein, The insulating rubber ring is provided between the riveting portion and the housing, and the sealing ring is sleeved outside the electrode terminal body and provided between the insulating rubber ring and the limiting portion.

8. The battery cell according to claim 5, wherein, The insulating plate is provided with a boss, the boss is axially opened to form the second through hole, the top of the boss abuts against the housing, and the bottom of the boss abuts against the limiting portion.

9. The battery cell according to any one of claims 1 to 4, characterized in that, The housing is further provided with a pair of sealing plates respectively sealing the pair of first through holes and a liquid injection hole located between the pair of first through holes.

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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