Battery, battery pack and vehicle

Abstract

The utility model provides a battery, a battery pack and a vehicle. The battery comprises a shell, a battery cell mounted in the shell, and a pair of cover plate assemblies respectively mounted at two ends of the shell, and tabs are respectively arranged at the first end and the second end of the battery cell. And the tabs comprise a positive tab and a negative tab. The cover plate assembly includes a base and a pair of conductive members mounted to the base. And the pair of conductive pieces are respectively connected with the positive tab and the negative tab. One of the pair of cover plate assemblies is provided with an anti-explosion valve, and the other cover plate assembly is provided with a liquid injection hole. The explosion-proof valve and the liquid injection hole are respectively arranged on the cover plate assemblies at the two ends, so that the distance between the explosion-proof valve and the liquid injection hole is increased, the influence between the explosion-proof valve and the liquid injection hole is avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery, a battery pack and a vehicle. BACKGROUND

[0002] With the continuous development of battery technology, consumers' requirements for battery performance are gradually increasing. The battery is provided with a battery cover plate at both ends, and the battery cover plate is provided with a conductive piece for connecting the tab of the battery cell to realize external power supply of the battery cell. In order to ensure the performance of the battery, the battery is usually provided with an explosion-proof valve and a liquid injection hole. The explosion-proof valve is used for releasing the internal pressure. The liquid injection hole is used for injecting electrolyte into the battery. At present, the distance between the explosion-proof valve and the liquid injection hole is close, and they will affect each other, so that the safety of the battery is low. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery, a battery pack and a vehicle to solve the related technical problems.

[0004] The first aspect of the present application provides a battery, comprising a shell, a battery cell installed in the shell, a pair of cover plate assemblies installed at both ends of the shell respectively; the first end and the second end of the battery cell are respectively provided with a tab, the tab comprises a positive tab and a negative tab, the cover plate assembly comprises a base and a pair of conductive pieces installed on the base; a pair of the conductive pieces are connected with the positive tab and the negative tab respectively; one of the pair of cover plate assemblies is provided with an explosion-proof valve, and the other is provided with a liquid injection hole.

[0005] By arranging the explosion-proof valve and the liquid injection hole on the cover plate assemblies at both ends respectively, the distance between the explosion-proof valve and the liquid injection hole is increased, the influence between them is avoided, and the safety of the battery is improved. Since the first end and the second end of the battery cell are both provided with a positive tab and a negative tab, the current path during charging and discharging of the battery is shortened, part of the current can be transmitted between the tabs at the same end, without crossing the battery cell to reach the tab at the other end, the temperature rise during charging is reduced, and the safety of the battery is improved.

[0006] Further, the tab at the first end comprises a base portion protruding from the battery cell, a bending portion bent from the base portion along a first direction, and a connecting portion bent away from the first direction from the bending portion, and the connecting portion is connected to the conductive piece. The tab at the first end is bent, which increases the flexibility of the tab, can effectively absorb the stress caused by the volume expansion during charging and discharging of the battery cell or external vibration, reduces the risk of fracture, and further improves the safety of the battery.

[0007] Further, the tab of the first end is S-shaped, the pair of cover plate assemblies comprises a first cover plate assembly connected with the tab of the first end, and the liquid injection hole is arranged on the first cover plate assembly. The liquid injection hole itself occupies a small volume, so that the thickness of the tab of the first end can be increased. Since the tab of the first end is S-shaped, the flexibility of the tab is ensured, and the internal resistance of the tab can be reduced by increasing the thickness, thereby reducing the temperature rise and improving the safety performance of the battery.

[0008] Further, a fixing member fixed to the first end is further included, the first cover plate assembly is fixed to a side of the fixing member away from the tab of the first end, and the tab of the first end is connected to the first cover plate assembly through the fixing member. By arranging the fixing member, the first cover plate assembly and the tab can be supported, and the overall structural strength of the battery is improved.

[0009] Further, a gap is arranged between the base and the bent portion, the fixing member comprises a supporting portion extending into the gap, and the bent portion abuts against the supporting portion. Since the supporting portion extends into the gap and abuts against the supporting portion, the S-shaped tab can be further supported, and the overall structural strength of the battery is improved.

[0010] Further, a protrusion is arranged on a side of the tab facing the conductive member, and the protrusion abuts against and is fixed to the conductive member. By arranging the protrusion on the side of the tab, the connection strength between the tab and the conductive member is improved, and the overcurrent effect is improved.

[0011] Further, the conductive member comprises a cell connecting portion and a power supply assembly portion, the power supply assembly portion is arranged on a side of the base away from the cell, the cell connecting portion comprises a tab plate and a plurality of pole columns, the tab plate is arranged on a side of the base facing the cell and connected with the tab, and the pole columns extend from the tab plate to a side away from the cell and are connected with the power supply assembly portion. By arranging the plurality of pole columns, the overcurrent area of the conductive member is increased, the internal resistance is reduced, the overcurrent capacity is improved, the temperature rise of the battery is reduced, and the safety of the battery is improved.

[0012] Further, the tab plate is provided with a base section and an extension section, the pole columns are arranged on the base section, and the extension section extends from the base section to another tab plate. By arranging the extension section, the connection area between the tab plate and the cell is increased, the overcurrent area of the conductive member is further increased, and the safety of the battery is improved.

[0013] The second aspect of the present application provides a battery pack comprising the above-mentioned battery. Since the battery of the present application has high safety, the battery pack of the present application has high stability.

[0014] The third aspect of the present application provides a vehicle comprising the battery pack described above. Since the battery pack of the present application has high stability, the vehicle of the present application has high reliability.

[0015] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and are not limiting to the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present specification and serve to explain the principles of the present specification.

[0017] Figure 1 is a structural diagram of a battery in an exemplary embodiment of the present application;

[0018] Figure 2 is Figure 1 a perspective exploded view of the battery in the embodiment;

[0019] Figure 3 is Figure 1 a structural diagram of the battery in the embodiment from a side view;

[0020] Figure 4 is Figure 1 a structural diagram of the battery in the embodiment from another side view;

[0021] Figure 5 is Figure 1 a partial cross-sectional view of A-A in the embodiment;

[0022] Figure 6 is Figure 5 a partial enlarged view of B in the embodiment;

[0023] Figure 7 is Figure 5 a partial enlarged view of C in the embodiment;

[0024] Figure 8 is Figure 2 a structural diagram of the first cover plate assembly in the embodiment;

[0025] Figure 9 is Figure 8 a perspective exploded view of the first cover plate assembly in the embodiment;

[0026] Figure 10 is Figure 2 a structural diagram of the second cover plate assembly in the embodiment;

[0027] Figure 11 is Figure 10 a perspective exploded view of the second cover plate assembly in the embodiment.

[0028] Explanation of reference numerals: shell, 10; battery cell, 20; first end, 201; second end, 202; tab, 21; positive tab, 2101; negative tab, 2102; first base, 211; bending part, 212; first connecting part, 213; gap, 214; protrusion, 215; second base, 216; second connecting part, 217; cover plate assembly, 30; fixing piece, 300; support part, 3001; first cover plate assembly, 301; second cover plate assembly, 302; base, 31; first insulating piece, 311; first through hole, 3111; second insulating piece, 312; second through hole, 3121; hollow part, 3122; groove, 3123; isolation part, 3124; support leg, 3125; mounting piece, 313; third through hole, 3131; valve hole, 3132; conductive piece, 32; battery cell connecting part, 321; pole plate, 3211; pole column, 3212; base section, 3213; extension section, 3214; power supply assembly part, 322; fixing hole, 3221; sealing ring, 33; explosion-proof valve, 40; liquid injection hole, 50. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments (or, the implementation manners) of the present application will be described clearly and completely in combination with the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings represent the same or similar elements unless otherwise indicated.

[0030] If the application embodiments involve directional indications or positional relationships (such as up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between components in a certain posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the embodiments of the present application are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0031] At present, the liquid injection hole of the battery is close to the explosion-proof valve, and the two may affect each other, resulting in low safety performance of the battery. The present application provides a battery to solve the related technical problems.

[0032] As Figures 1 to 4As shown, the first aspect of the present application provides a battery, comprising a shell 10, an electric core 20 mounted into the shell 10, and a pair of cover plate assemblies 30 mounted to both ends of the shell 10 respectively. The first end 201 and the second end 202 of the electric core 20 are respectively provided with a pair of tabs 21. The tabs 21 comprise a positive tab 2101 and a negative tab 2102. The cover plate assembly 30 comprises a base 31 and a pair of conductive pieces 32 mounted to the base 31. The pair of conductive pieces 32 are connected to the positive tab 2101 and the negative tab 2102 respectively. One of the pair of cover plate assemblies 30 is provided with an explosion-proof valve 40, and the other is provided with a liquid injection hole 50.

[0033] By arranging the explosion-proof valve 40 and the liquid injection hole 50 on the cover plate assemblies 30 at both ends respectively, the distance between the explosion-proof valve 40 and the liquid injection hole 50 is increased, avoiding the influence between them, and improving the safety of the battery.

[0034] The cover plate assembly 30 comprises a first cover plate assembly 301 and a second cover plate assembly 302. The liquid injection hole 50 is arranged on the first cover plate assembly 301. The explosion-proof valve 40 is arranged on the second cover plate assembly 302.

[0035] At the same time, since the first end 201 and the second end 202 of the electric core 20 are both provided with the positive tab 2101 and the negative tab 2102, the current path of the battery during charging and discharging is shortened, and part of the current can be transmitted between the tabs 21 at the same end, without crossing the electric core 20 to reach the tab 21 at the other end, reducing the temperature rise during charging and improving the safety of the battery.

[0036] The structure of the positive tab 2101 and the negative tab 2102 at each end is the same. In order to ensure the overcurrent capacity of the tab 21, the width ratio of the positive tab 2101 to the electric core 20 can be greater than or equal to 0.2 and less than or equal to 0.8. The width ratio of the negative tab 2102 to the electric core 20 can be greater than or equal to 0.3 and less than or equal to 0.8. The width of the negative tab 2102 can be greater than that of the positive tab 2101.

[0037] Please refer to Figure 5 and Figure 6 As shown, the tab 21 of the first end 201 comprises a base 211, a bent portion 212, and a connecting portion 213. The base 211 protrudes from the electric core 20. The bent portion 212 is bent from the base 211 along a first direction. The connecting portion 213 is bent from the bent portion 212 away from the first direction. The connecting portion 213 is connected to the conductive piece 32. The first direction is the direction of the arrow in Figure 6 . There is a gap 214 between the base 211 and the bent portion 212.

[0038] The tab 21 of the first end 201 is bent to form, which increases the flexibility of the tab 21, can effectively absorb the stress caused by the volume expansion or external vibration in the charging and discharging process of the battery cell 20, reduces the risk of fracture, and further improves the safety of the battery.

[0039] Specifically, the tab 21 of the first end 201 can be S-shaped. The first cover plate assembly 301 is connected with the tab 21 of the first end 201. The volume occupied by the liquid injection hole 50 itself is small, so that the thickness of the tab 21 of the first end 201 can be increased. Since the tab 21 of the first end 201 is S-shaped, while ensuring the flexibility of the tab 21, the internal resistance of the tab 21 can be reduced by increasing the thickness, and the safety performance of the battery is comprehensively improved.

[0040] The battery further comprises a fixing member 300 fixed to the first end 201. The first cover plate assembly 301 is fixed to the side of the fixing member 300 away from the tab 21 of the first end 201. The tab 21 of the first end 201 is connected to the first cover plate assembly 301 through the fixing member 300. By setting the fixing member 300, the first cover plate assembly 301 and the tab 21 can be supported, and the overall structural strength of the battery is improved.

[0041] The fixing member 300 comprises a supporting portion 3001 extending into the gap 214, and the bent portion 212 abuts against the supporting portion 3001. Since the supporting portion 3001 extends into the gap 214 and abuts against the supporting portion 3001, the S-shaped tab 21 can be further supported, and the overall structural strength of the battery is improved.

[0042] The side of the tab 21 facing the conductive member 32 is provided with a protrusion 215, and the protrusion 215 abuts and fixes the conductive member 32. By setting the protrusion 215 on one side of the tab 21, the connection strength of the tab 21 and the conductive member 32 is strengthened, and the overcurrent effect is improved.

[0043] Please refer to Figure 7 As shown, the tab 21 of the second end 202 comprises a second base 216 extending from the battery cell 20, and a second connecting portion 217 bent from the second base 216. The tab 21 of the second end 202 is C-shaped, and the C-shaped structure is relatively simple and easy to manufacture. Moreover, since the path of the electrons is relatively short, the tab 21 of the second end 202 also has relatively low internal resistance.

[0044] When assembling, since the tab 21 of the second end 202 has a relatively simple structure, the second end 202 of the battery cell can be installed into the shell first as a reference to install the first end 201 into the shell, which can ensure the installation accuracy of the battery cell 20. In other embodiments, the tab 21 of the second end 202 can also be S-shaped.

[0045] Please refer to Figure 8 andFigure 9 As shown, Figure 8 And Figure 9 A structural diagram of the first cover plate assembly 301 provided with the liquid injection hole 50 is shown. The base 31 comprises a first insulating piece 311, a second insulating piece 312 and a mounting piece 313. The first insulating piece 311 and the second insulating piece 312 clamp and fix the mounting piece 313, improving the structural strength of the base 31 as a whole. The materials of the first insulating piece 311 and the second insulating piece 312 can be plastic.

[0046] The first insulating piece 311 is provided with a first through hole 3111. The second insulating piece 312 is provided with a second through hole 3121. The second insulating piece 312 is provided with a hollow part 3122 and a groove 3123 to reduce thermal shrinkage. The mounting piece 313 is provided with a third through hole 3131. The first through hole 3111, the second through hole 3121 and the third through hole 3131 are arranged in alignment.

[0047] The conductive piece 32 comprises a cell connecting part 321 and a power supply assembly part 322, and the power supply assembly part 322 is mounted to the side of the base 31 away from the cell 20. The cell connecting part 321 comprises a plate 3211 and a plurality of poles 3212. The plate 3211 is mounted to the side of the base 31 facing the cell 20 and connected with the tab 21, and the poles 3212 extend from the plate 3211 to the side away from the cell 20 and are connected with the power supply assembly part 322.

[0048] Specifically, the number of cell connecting parts 321 is two. The cell connecting part 321 is mounted to the second insulating piece 312. The number of power supply assembly parts 322 is set to two. The number of first insulating pieces 311 can also be two. The power supply assembly part 322 is mounted to the first insulating piece 311. By providing a plurality of poles 3212, the overcurrent area of the conductive piece 32 is increased, the internal resistance is reduced, the overcurrent capacity is improved, the temperature rise of the battery is reduced, and the safety of the battery is improved.

[0049] The plate 3211 is provided with a base section 3213 and an extension section 3214, and the poles 3212 are arranged on the base section 3213, and the extension section 3214 extends from the base section 3213 to the other plate 3211. By providing the extension section 3214, the connection area of the plate 3211 and the cell 20 is increased, the overcurrent area of the conductive piece 32 is further improved, and the safety of the battery is improved.

[0050] The power supply assembly part 322 is provided with a fixing hole 3221. The poles 3212 pass through the second through hole 3121, the third through hole 3131 and the first through hole 3111 in sequence and are mounted to the fixing hole 3221. The cell connecting part 321 and the power supply assembly part 322 can be fixed by riveting, which has high strength. A sealing ring 33 is sleeved on the pole 3212 to realize the sealing of the cover plate assembly 30.

[0051] Please refer to Figure 10 and Figure 11 as shown, Figure 10 and Figure 11 The structure of the second cover plate assembly 302 provided with the explosion-proof valve 40 is shown. The first cover plate assembly 301 is similar in structure to the second cover plate assembly 302. In the second cover plate assembly 302, the mounting member 313 is further provided with a valve hole 3132, and the explosion-proof valve 40 is assembled to the valve hole 3132. When the internal pressure of the battery is too large, the explosion-proof valve 40 is opened to release the internal pressure.

[0052] In the second cover plate assembly 302, the middle part of the second insulating member 312 is further provided with a separation part 3124 to separate the positive and negative tabs to avoid contact conduction. The two ends of the second insulating member 312 are provided with feet 3125 to realize the assembly and fixation of the second cover plate assembly and the shell 10.

[0053] The second aspect of the present application provides a battery pack comprising the above-mentioned battery. Since the battery of the present application has high safety, the battery pack of the present application has high stability.

[0054] The third aspect of the present application provides a vehicle comprising the above-mentioned battery pack. Since the battery pack of the present application has high stability, the vehicle of the present application has high reliability. The vehicle of the present application can be an electric vehicle or a hybrid vehicle, and the specific type is not limited.

[0055] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell, an electric core mounted in the shell, and a pair of cover plate assemblies mounted to two ends of the shell respectively; a first end and a second end of the electric core are respectively provided with tabs, the tabs comprise positive tabs and negative tabs, the cover plate assemblies comprise a base and a pair of conductive pieces mounted to the base, and the pair of conductive pieces are respectively connected to the positive tabs and the negative tabs; one of the pair of cover plate assemblies is provided with an explosion-proof valve, and the other is provided with a liquid injection hole.

2. The battery of claim 1, wherein, The tabs of the first end comprise a base portion protruding from the electric core, a bending portion bent from the base portion along a first direction, and a connecting portion bent from the bending portion away from the first direction, and the connecting portion is connected to the conductive piece.

3. The battery of claim 2, wherein, The tabs of the first end are S-shaped, the pair of cover plate assemblies comprise a first cover plate assembly connected to the tabs of the first end, and the liquid injection hole is arranged in the first cover plate assembly.

4. The battery of claim 3, wherein, Further comprising a fixing piece fixed to the first end, the first cover plate assembly is fixed to a side of the fixing piece away from the tabs of the first end, and the tabs of the first end pass through the fixing piece and are connected to the first cover plate assembly.

5. The battery of claim 4, wherein, There is a gap between the base portion and the bending portion, the fixing piece comprises a supporting portion extending into the gap, and the bending portion abuts against the supporting portion.

6. The battery of claim 1, wherein, A side of the tab facing the conductive piece is provided with a protrusion, and the protrusion abuts against and fixes the conductive piece.

7. The battery of claim 1, wherein, The conductive piece comprises an electric core connecting portion and a power supply assembly portion, and the power supply assembly portion is mounted to a side of the base away from the electric core; The electric core connecting portion comprises a tab plate and a plurality of pole columns, the tab plate is mounted to a side of the base facing the electric core and is connected to the tab, and the pole columns extend from the tab plate to a side away from the electric core and are connected to the power supply assembly portion.

8. The battery of claim 7, wherein, The tab plate is provided with a base section and an extension section, the pole columns are arranged in the base section, and the extension section extends from the base section to the other tab plate.

9. A battery pack, characterized by, The battery as claimed in any one of claims 1-8. The battery pack as claimed in claim 9.

10. A vehicle characterized by comprising: ​ ​

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