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, the battery cell comprises a shell, the shell is provided with an accommodating cavity, and a plurality of first through holes arranged at intervals are formed in the top end surface of the shell along the length direction; the electrode assembly is arranged in the accommodating cavity, a plurality of tabs are arranged on the electrode assembly, and the tabs are arranged at the first through holes; the plurality of sealing plates are correspondingly mounted on the plurality of first through holes respectively; a liquid injection hole is formed in one of the multiple sealing plates, and an anti-explosion valve is arranged on at least one of the multiple sealing plates. According to the utility model, the positions of the anti-explosion valve and the liquid injection hole can be flexibly arranged, and the welding area of the connecting sheet and the tab cannot be limited; when the battery core needs to have relatively high overcurrent capacity, the welding area of the connecting sheet and the tab can be increased, and then the size of the first through hole or the position of the first through hole on the shell is adaptively changed, so that the welding area of the connecting sheet and the tab is conveniently increased, and the overcurrent capacity of the battery core is effectively 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 increasing maturity of new energy battery technology, new energy batteries are currently widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance of new energy batteries are increasing day by day.

[0003] In related technologies, a battery cell generally includes a cover plate and a housing, and an explosion-proof valve and a liquid injection hole are arranged on the cover plate or the housing. Since the positions of the explosion-proof valve and the liquid injection hole are fixed, the welding area between the connecting piece and the tab cannot be changed. If the welding area between the connecting piece and the tab is too small, the over-current capacity of the battery cell will be too small, resulting in a reduction in the safety performance 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 of too small over-current capacity of the battery cell.

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

[0006] A housing having an accommodation cavity, and a plurality of first through holes spaced apart along the length direction are provided on the top end surface of the housing;

[0007] An electrode assembly disposed in the accommodation cavity, and a plurality of tabs are provided on the electrode assembly, and the plurality of tabs are disposed at the first through holes;

[0008] A plurality of sealing plates respectively mounted on the plurality of first through holes;

[0009] A liquid injection hole is provided on one of the plurality of sealing plates, and an explosion-proof valve is provided on at least another one of the plurality of sealing plates.

[0010] Beneficial effects: By providing a plurality of first through holes spaced apart along the length direction on the top end face of the housing and arranging the tab at the first through hole, it is possible to prevent the tab from randomly distributing in the accommodating cavity and occupying too much space, making the internal structure of the battery cell more compact, improving the space utilization rate inside the battery cell, and facilitating the subsequent connection between the tab and the connecting piece, thereby improving the reliability and stability of the connection. Further, a sealing plate is correspondingly installed on the first through hole, and then the explosion-proof valve and the liquid injection hole are respectively arranged on different sealing plates; the positions of the explosion-proof valve and the liquid injection hole can be flexibly set, and the explosion-proof valve and the liquid injection hole will not limit the welding area between the connecting piece and the tab; when a battery cell with a large overcurrent capacity is required, the welding area between the connecting piece and the tab can be increased, and then the size of the first through hole or the position of the first through hole on the housing can be adaptively changed, so as to facilitate increasing the welding area between the connecting piece and the tab and effectively improve the overcurrent capacity of the battery cell. Arranging the explosion-proof valve and the liquid injection hole on the sealing plate can also optimize the space utilization inside the battery cell, making the battery cell structure more compact and further improving the internal space utilization rate of the battery cell. Secondly, it also helps to improve the overall sealing performance of the battery cell, effectively prevent the leakage of the electrolyte, reduce the risk of short circuit of the battery cell, and thus ensure the safety performance and service life of the battery cell.

[0011] In an alternative embodiment, two second through holes are further provided on the top end face of the housing, which are respectively arranged at both ends along the length direction of the top end face of the housing, and a plurality of the first through holes are arranged between the two second through holes.

[0012] Beneficial effects: By reasonably setting the positions of the second through hole and the first through hole, during the process of assembling each component on the housing, it can enable the operator to more clearly distinguish the uses of the through holes at different positions, improve the assembly efficiency, and also enable the operator to quickly locate and handle problems related to specific through holes during maintenance. It can also maintain the structural strength of the housing to the greatest extent while ensuring the functions of other components on the housing.

[0013] In an alternative embodiment, a pole column is further included, and the pole column includes a positive pole column and a negative pole column, which are respectively arranged in the two second through holes.

[0014] Beneficial effects: By arranging the positive pole column and the negative pole column in the second through holes at both ends of the top end face of the housing, the force on the housing can be made more uniform, enhancing the stability of the overall structure; in an environment subjected to vibration or impact, the damage of the housing caused by uneven force can be reduced. By increasing the distance between the positive pole column and the negative pole column, the risk of short circuit between the positive and negative poles caused by accidental factors can also be reduced.

[0015] In an alternative embodiment, an upper plastic ring and a sealing ring are further included, which are arranged between the pole column and the housing, and the pole column is in contact with the housing through the upper plastic ring and the sealing ring.

[0016] Beneficial effects: By arranging the upper plastic ring and the sealing ring between the terminal post and the housing, the tiny gaps between the terminal post and the housing can be filled, effectively preventing external dust, moisture and other impurities from entering the interior of the battery cell, avoiding short circuits or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. During the operation of the battery cell, it may be subject to vibration or impact. The upper plastic ring and the sealing ring can also play a buffering role, reducing the direct collision and wear between the terminal post and the housing, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring has good insulation performance, which can prevent accidental conductive contact between the terminal post and the housing, thereby improving the electrical safety of the battery cell.

[0017] In an alternative embodiment, a plurality of the tabs are integrally formed with the electrode assembly, and in the width direction of the electrode assembly, two adjacent tabs are disposed opposite to each other.

[0018] Beneficial effects: Integrally forming a plurality of tabs with the electrode assembly can increase the connection stability between the tabs and the electrode assembly; the oppositely disposed tabs make the layout more compact, further saving the accommodation space inside the battery cell.

[0019] In an alternative embodiment, a connecting piece is further included and is disposed between two adjacent tabs;

[0020] The connecting piece includes a positive connecting piece and a negative connecting piece; the positive connecting piece includes a first connecting portion and a second connecting portion, and the first connecting portion is fixedly connected to the positive terminal post;

[0021] The negative connecting piece includes a third connecting portion and a fourth connecting portion, and the third connecting portion is fixedly connected to the negative terminal post.

[0022] Beneficial effects: Disposing the connecting piece between two opposite tabs can play a certain supporting and fixing role, enhancing the connection stability between the tab and the connecting piece; by differentiating the positive connecting piece and the negative connecting piece and fixedly connecting the connecting parts of the positive connecting piece and the negative connecting piece to the positive terminal post and the negative terminal post respectively, the resistance and energy loss during current transmission can be reduced, enabling the current to flow more efficiently between the battery cell and the external circuit. By designing and combining the connecting portions on the connecting piece, the connecting piece can be adapted to various different current magnitudes, voltage requirements and working environments.

[0023] In an alternative embodiment, two adjacent tabs are bent towards each other and are respectively fixedly connected to the second connecting portion and the fourth connecting portion.

[0024] Beneficial effects: After bending two adjacent tabs towards each other and then fixedly connecting them to the second connecting part of the positive connecting piece and the fourth connecting part of the negative connecting piece respectively, the current conduction path is increased and the resistance is reduced, thereby improving the efficiency of current transmission between the electrode assembly and the connecting piece. At the same time, the fixed connection of multiple tabs can withstand a larger current, thereby enhancing the instantaneous power output ability of the battery cell.

[0025] In an optional embodiment, it further includes a lower plastic sheet disposed between the housing and the connecting piece; the lower plastic sheet is provided with a third through hole and a fourth through hole corresponding to the first through hole and the second through hole respectively.

[0026] Beneficial effects: By providing a third through hole and a fourth through hole corresponding to the first through hole and the second through hole on the lower plastic sheet, it is convenient for the pole post to pass through the second through hole and the fourth through hole and then be fixedly connected to the connecting piece, and it is also convenient for the tab to pass through the first through hole and the third through hole and then be fixedly connected to the connecting piece. The lower plastic sheet has good insulation performance. Disposing the lower plastic sheet between the housing and the connecting piece can prevent accidental conductive contact between the pole post and the housing, further improving the electrical safety of the battery cell.

[0027] In an optional embodiment, the first through hole is a stepped hole with a larger upper part and a smaller lower part, the sealing plate matches the large hole of the stepped hole, and the sealing plate is installed in the large hole and abuts against the step surface of the stepped hole.

[0028] Beneficial effects: By setting the first through hole as a stepped hole with a larger upper part and a smaller lower part and installing the sealing plate in the large hole of the stepped hole and abutting against the step surface of the stepped hole; the step surface can provide a stable support and positioning for the sealing plate, making the contact between the sealing plate and the first through hole closer, effectively preventing leakage of gas or liquid. The stepped hole can also limit the movement of the sealing plate and prevent it from being displaced due to vibration or other external forces during operation, thereby ensuring the reliability of the seal. When installing the sealing plate on the housing, the stepped hole with a larger upper part and a smaller lower part can also more conveniently place the sealing plate accurately in place.

[0029] In a second aspect, the present utility model further provides a battery pack, including: a plurality of battery cells as described above.

[0030] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A perspective view of a battery cell according to an embodiment of the present utility model;

[0033] Figure 2 For Figure 1 A top view of the battery cell shown;

[0034] Figure 3 For Figure 2 A cross-sectional view taken along the A-A direction in ;

[0035] Figure 4 For Figure 3 A partial enlarged view of A in ;

[0036] Figure 5 A perspective view of a battery cell according to another embodiment of the present utility model;

[0037] Figure 6 For Figure 5 A top view of the battery cell shown;

[0038] Figure 7 For Figure 6 A cross-sectional view taken along the B-B direction in ;

[0039] Figure 8 For Figure 7 A partial enlarged view of B in ;

[0040] Figure 9 A perspective view of a battery cell according to another embodiment of the present utility model;

[0041] Figure 10 For Figure 9 A top view of the battery cell shown;

[0042] Figure 11 For Figure 10 A cross-sectional view taken along the C-C direction in.

[0043] Explanation of reference numerals:

[0044] 100. Battery cell; 101. Housing; 102. Upper plastic ring; 103. Negative electrode terminal; 104. Negative connection piece; 1041. Third connection part; 1042. Fourth connection part; 105. Sealing ring; 106. Sealing plate; 1061. Explosion-proof valve; 1062. Liquid injection hole; 107. Insulating part; 108. Lower plastic sheet; 109. Positive connection piece; 1091. First connection part; 1092. Second connection part; 110. Positive electrode terminal; 120. First through hole; 130. Second through hole; 121. Step surface; 122. Large hole; 200. Electrode assembly; 210. Tab. Detailed implementation manner

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, 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 skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] The following combines Figures 1 to 11 , and describes the embodiments of the present invention.

[0047] According to an embodiment of the present invention, on the one hand, as Figures 1 to 8 shown, a battery cell 100 is provided, including: a housing 101 having an accommodation cavity, and a plurality of first through holes 120 spaced apart along the length direction are formed on the top end surface of the housing 101; an electrode assembly 200 disposed in the accommodation cavity, a plurality of tabs 210 are provided on the electrode assembly 200, and the plurality of tabs 210 are disposed at the first through holes 120; a plurality of sealing plates 106 are respectively installed on the plurality of first through holes 120; a liquid injection hole 1062 is provided on one of the plurality of sealing plates 106, and an explosion-proof valve 1061 is provided on at least another one of the plurality of sealing plates 106.

[0048] In this embodiment, by providing a plurality of first through holes 120 spaced apart along the length direction on the top end surface of the housing 101 and disposing the tabs 210 at the first through holes 120, it is possible to prevent the tabs 210 from being randomly distributed in the accommodation cavity and occupying too much space, making the internal structure of the battery cell 100 more compact, improving the space utilization rate inside the battery cell 100, and facilitating the subsequent connection of the tabs 210 to the connecting piece, thereby improving the reliability and stability of the connection. Further, a sealing plate 106 is correspondingly installed on the first through hole 120, and the explosion-proof valve 1061 and the liquid injection hole 1062 are respectively disposed on different sealing plates 106; the positions of the explosion-proof valve 1061 and the liquid injection hole 1062 can be flexibly set, and the explosion-proof valve 1061 and the liquid injection hole 1062 will not limit the welding area of the connecting piece and the tab 210; when the battery cell 100 needs to have a large overcurrent capacity, the welding area of the connecting piece and the tab 210 can be increased, and then the size of the first through hole 120 or the position of the first through hole 120 on the housing 101 can be adaptively changed, so as to facilitate increasing the welding area of the connecting piece and the tab 210 and effectively improve the overcurrent capacity of the battery cell 100. Disposing the explosion-proof valve 1061 and the liquid injection hole 1062 on the sealing plate 106 can also optimize the space utilization inside the battery cell 100, make the structure of the battery cell 100 more compact, and further improve the internal space utilization rate of the battery cell 100. Secondly, it also helps to improve the overall sealing performance of the battery cell 100, can effectively prevent electrolyte leakage, reduce the risk of short circuit of the battery cell 100, and thus ensure the safety performance and service life of the battery cell 100.

[0049] In one of the embodiments, as Figure 8 shown, the first through hole 120 is a stepped hole with a larger upper part and a smaller lower part, the sealing plate 106 matches the large hole 122 of the stepped hole, and the sealing plate 106 is installed in the large hole 122 and abuts against the step surface 121 of the stepped hole.

[0050] In this embodiment, the step surface 121 can provide a stable support and positioning for the sealing plate 106, making the contact between the sealing plate 106 and the first through hole 120 closer, and effectively preventing the leakage of gas or liquid. After the sealing plate 106 is installed in the large hole 122, the movement of the sealing plate 106 can be effectively restricted, preventing it from being displaced due to vibration or other external forces during operation, thereby ensuring the reliability of the seal. When installing the sealing plate 106 on the housing 101, the stepped hole with a larger upper part and a smaller lower part can also more conveniently place the sealing plate 106 accurately in place.

[0051] In other embodiments, two first through-holes 120 may be provided. The shape of the first through-holes 120 may be square. Then, the sealing plate 106 is a square sealing plate 106 matching the square through-holes. An explosion-proof hole is provided at the center position of one of the square sealing plates 106, and an explosion-proof valve 1061 is installed in the explosion-proof hole. A liquid injection hole 1062 is provided at the center position of the other square sealing plate 106. The number and shape of the first through-holes 120 can be set according to actual usage requirements without specific limitations.

[0052] In one of the embodiments, two second through-holes 130 are further provided on the top end face of the housing 101, which are respectively arranged at both ends along the length direction of the top end face of the housing 101. A plurality of first through-holes 120 are arranged between the two second through-holes 130.

[0053] In this embodiment, by reasonably setting the positions of the second through-holes 130 and the first through-holes 120, during the process of assembling each component on the top end face of the housing 101, it can enable the operator to more clearly distinguish the uses of the through-holes at different positions, improve the assembly efficiency, and also enable the operator to quickly locate and handle problems related to specific through-holes during maintenance. At the same time, while ensuring the functions of other components on the housing 101, the structural strength of the housing 101 can be maintained to the greatest extent.

[0054] In one of the embodiments, a pole column is further included. The pole column includes a positive pole column 110 and a negative pole column 103, which are respectively arranged in the two second through-holes 130.

[0055] In this embodiment, by arranging the positive pole column 110 and the negative pole column 103 in the second through-holes 130 at both ends of the housing 101, the force on the housing 101 can be made more uniform, enhancing the stability of the overall structure; in an environment where vibration or impact is endured, the damage of the housing 101 caused by uneven force can be reduced. By increasing the distance between the positive pole column 110 and the negative pole column 103, the risk of short circuit between the positive and negative poles caused by accidental factors can also be reduced.

[0056] In one of the embodiments, such as Figures 9 to 11 , a plurality of pole tabs 210 are integrally formed with the electrode assembly 200. In the width direction of the electrode assembly 200, two adjacent pole tabs 210 are arranged oppositely.

[0057] In this embodiment, four tabs 210 can be provided on the electrode assembly 200, and two tabs 210 are oppositely arranged in the width direction of the electrode assembly 200; the four tabs 210 are connected to the top end face of the electrode assembly 200, extend away from the electrode assembly 200 from the top end face of the electrode assembly 200, and pass through the first through hole 120; by integrally forming the plurality of tabs 210 with the electrode assembly 200, the connection stability between the tabs 210 and the electrode assembly 200 can be increased; the oppositely arranged tabs 210 make the layout more compact, further saving the accommodation space inside the battery cell 100.

[0058] In one embodiment, a connecting piece is further included and is arranged between two adjacent tabs 210; the connecting piece includes a positive connecting piece 109 and a negative connecting piece 104; the positive connecting piece 109 includes a first connecting portion 1091 and a second connecting portion 1092, and the first connecting portion 1091 is fixedly connected to the positive electrode post 110; the negative connecting piece 104 includes a third connecting portion 1041 and a fourth connecting portion 1042, and the third connecting portion 1041 is fixedly connected to the negative electrode post 103.

[0059] In this embodiment, arranging the connecting piece between two opposite tabs 210 can play a certain supporting and fixing role, enhancing the connection stability between the tab 210 and the connecting piece; the connection mode between the first connecting portion 1091 of the positive connecting piece 109 and the positive electrode post 110 can be a welding connection, specifically, ultrasonic welding or laser welding can be used; to improve the connection stability between the connecting piece and the electrode post. Similarly, the third connecting portion 1041 of the negative connecting piece 104 can be fixedly connected to the negative electrode post 103 by ultrasonic welding or laser welding. By differentiating the positive connecting piece 109 and the negative connecting piece 104 and fixedly connecting the connecting parts of the positive connecting piece 109 and the negative connecting piece 104 to the positive electrode post 110 and the negative electrode post 103 respectively, the resistance and energy loss during current transmission can be reduced, enabling the current to flow more efficiently between the battery cell 100 and the external circuit. Further, by designing and combining the connecting parts on the connecting piece, the connecting piece can be adapted to various different current magnitudes, voltage requirements, and working environments. For example, when large current and high voltage need to be withstood, the welding area between the first connecting portion 1091 and the positive electrode post 110 and the connection area between the third connecting portion 1041 and the negative electrode post 103 can be increased to improve the overcurrent capacity of the battery cell 100.

[0060] In one embodiment, two adjacent tabs 210 are bent towards each other and are respectively fixedly connected to the second connecting portion 1092 and the fourth connecting portion 1042.

[0061] In this embodiment, the two opposite pole tabs 210 are bent toward each other and fixedly connected to the second connection portion 1092 of the positive electrode connecting sheet 109 and the fourth connection portion 1042 of the negative electrode connecting sheet 104. Specifically, the pole tabs 210 can also be electrically connected to the connecting sheet by welding to enhance the connection stability between the pole tabs 210 and the connecting sheet. By fixing the plurality of pole tabs 210 to the second connection portion 1092 of the positive electrode connecting sheet 109 and the fourth connection portion 1042 of the negative electrode connecting sheet 104, the conduction path of the current is increased and the resistance is reduced, thereby improving the efficiency of the current transmission between the electrode assembly 200 and the connecting sheet. It can also more effectively balance the potential distribution and chemical reaction of the electrode assembly 200 during the charging and discharging process, thereby improving the overall performance and consistency of the battery cell 100. At the same time, the fixed connection of the plurality of pole tabs 210 can withstand a larger current, thereby improving the overcurrent capacity of the battery cell 100.

[0062] In other embodiments, strip holes are provided on the second connecting portion 1092 of the positive electrode connecting sheet 109 and the fourth connecting portion 1042 of the negative electrode connecting sheet 104. When the electrode tab 210 on the electrode assembly 200 is bent, it can be fixedly connected to the second connecting portion 1092 and the fourth connecting portion 1042, thereby avoiding affecting other structures on the connecting sheet during the welding process of the electrode tab 210 to the second connecting portion 1092 and the fourth connecting portion 1042 respectively.

[0063] In other embodiments, the positive electrode connecting sheet 109 further includes a fifth connecting portion, through which the first connecting portion 1091 and the second connecting portion 1092 are connected, and the fifth connecting portion makes the first connecting portion 1091 and the second connecting portion 1092 not on the same horizontal plane, so that the first connecting portion 1091 and the second connecting portion 1092 are respectively connected to the positive electrode column 110 and the pole ear 210. Similarly, the negative electrode connecting sheet 104 includes a sixth connecting portion, through which the third connecting portion 1041 and the fourth connecting portion 1042 are connected, and the third connecting portion 1041 and the fourth connecting portion 1042 are not on the same horizontal plane.

[0064] In one embodiment, if Figure 3 , Figure 4 As shown, it also includes an upper plastic ring 102 and a sealing ring 105 , which are arranged between the pole and the shell 101 , and the pole is in contact with the shell 101 through the upper plastic ring 102 and the sealing ring 105 .

[0065] In this embodiment, the upper plastic ring 102 and the sealing ring 105 are arranged between the pole post and the housing 101, which can fill the tiny gap between the pole post and the housing 101, effectively preventing external dust, moisture and other impurities from entering the interior of the battery cell 100, avoiding short circuits or corrosion inside the battery cell 100, and ensuring the normal operation and service life of the battery cell 100. During the operation of the battery cell 100, it may be subject to vibration or impact. The upper plastic ring 102 and the sealing ring 105 can also play a buffering role, reducing the direct collision and wear between the pole post and the housing 101, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring 102 has good insulation performance, which can prevent accidental conductive contact between the pole post and the housing 101, thereby improving the electrical safety of the battery cell 100.

[0066] In one of the embodiments, it further includes a lower plastic sheet 108, which is arranged between the housing 101 and the connecting piece; the lower plastic sheet 108 is provided with a third through hole and a fourth through hole corresponding to the first through hole 120 and the second through hole 130 respectively.

[0067] In this embodiment, by providing a third through hole and a fourth through hole corresponding to the first through hole 120 and the second through hole 130 on the lower plastic sheet 108, after the pole post passes through the second through hole 130 on the housing 101, it then passes through the fourth through hole on the lower plastic sheet 108, and then is fixedly connected to the connecting piece; after the pole tab 210 passes through the third through hole on the lower plastic sheet 108, it then passes through the first through hole 120 on the housing 101, and then the pole tab 210 is fixedly connected to the connecting piece. At the same time, the lower plastic sheet 108 has good insulation performance. Arranging the lower plastic sheet 108 between the housing 101 and the connecting piece can prevent accidental conductive contact between the pole post and the housing 101, further improving the electrical safety of the battery cell 100.

[0068] In one of the embodiments, it further includes an insulating member 107, which is arranged between the lower plastic sheet 108 and the sealing plate 106, and the size of the insulating member 107 is smaller than that of the sealing plate 106; by providing the insulating member 107, it can effectively prevent conductive contact between the pole tab 210 and the sealing plate 106, thereby improving the electrical safety of the battery cell 100.

[0069] In one of the embodiments, the liquid injection hole 1062 is arranged on the sealing plate 106 near the positive pole post 110, and the explosion-proof valve 1061 is arranged on the sealing plate 106 near the negative pole post 103.

[0070] In this embodiment, by disposing the liquid injection hole 1062 near the positive electrode post 110, during the liquid injection process, the liquid can flow more smoothly to various regions inside the battery cell 100, improving the uniformity and efficiency of liquid injection. The explosion-proof valve 1061 is disposed near the negative electrode post 103. When the pressure inside the battery cell 100 is too high, the gas can be discharged in a timely and effective manner, reducing the risk of explosion. Moreover, when it is necessary to activate the explosion-proof valve 1061 in case of a dangerous situation, the pressure release direction generated by it is relatively separated from the current transmission direction of the positive electrode post 110, reducing the direct impact on the positive electrode post 110 and related circuits, thereby reducing the risk of circuit damage and expansion of faults. In other embodiments, the positions of the liquid injection hole 1062 and the explosion-proof valve 1061 on the sealing plate 106 are arbitrary and can be set according to actual needs without specific limitations.

[0071] In one of the embodiments, the upper plastic ring 102, the lower plastic sheet 108, the sealing ring 105, the positive electrode post 110, the negative electrode post 103, the connecting piece and the sealing plate 106 can all be disposed on the housing 101 and assembled into a whole, and supplied in the form of a component, simplifying the assembly process of the battery cell 100; moreover, by integrally disposing the upper plastic ring 102, the lower plastic sheet 108, the sealing ring 105, the positive electrode post 110, the negative electrode post 103, the connecting piece and the sealing plate 106 with the housing 101, the sealing effect of the battery cell 100 and the stability during the working process can also be increased.

[0072] In this embodiment, the battery cell 100 includes but is not limited to a lithium-ion battery cell 100.

[0073] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including: a plurality of battery cells 100 as described above. A plurality of battery cells 100 form a battery module, and a plurality of battery modules form a battery pack. The battery pack has the same effects as the battery cell 100 and will not be elaborated herein.

[0074] 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: include: A housing, the housing having a receiving cavity, and a top end surface of the housing having a plurality of first through holes arranged at intervals along a length direction; An electrode assembly is disposed in the accommodating cavity, and a plurality of pole tabs are disposed on the electrode assembly, and the plurality of pole tabs are disposed at the first through hole; A plurality of sealing plates are respectively mounted on the plurality of the first through holes; A liquid injection hole is provided on one of the plurality of sealing plates, and an explosion-proof valve is provided on at least another one of the plurality of sealing plates.

2. The battery cell according to claim 1, characterized in that: The top end surface of the shell is further provided with two second through holes, which are respectively arranged at two ends along the length direction of the top end surface of the shell, and a plurality of the first through holes are arranged between two of the second through holes.

3. The battery cell according to claim 2, characterized in that: It also includes poles, which include a positive pole and a negative pole, which are respectively arranged in the two second through holes.

4. The battery cell according to claim 3, characterized in that: It also includes an upper plastic ring and a sealing ring, which are arranged between the pole and the shell. The pole is in contact with the shell through the upper plastic ring and the sealing ring.

5. The battery cell according to claim 3, characterized in that: The plurality of electrode tabs are integrally formed with the electrode assembly, and in the width direction of the electrode assembly, two adjacent electrode tabs are arranged opposite to each other.

6. The battery cell according to claim 5, characterized in that: It also includes a connecting piece, which is arranged between two adjacent pole ears; The connecting piece includes a positive connecting piece and a negative connecting piece; the positive connecting piece includes a first connecting portion and a second connecting portion, and the first connecting portion is fixedly connected to the positive electrode column; The negative electrode connecting piece includes a third connecting portion and a fourth connecting portion, and the third connecting portion is fixedly connected to the negative electrode column.

7. The battery cell according to claim 6, characterized in that: Two adjacent pole tabs are bent toward each other and are fixedly connected to the second connecting portion and the fourth connecting portion respectively.

8. The battery cell according to claim 6, characterized in that: It also includes a lower plastic sheet, which is arranged between the shell and the connecting sheet; the lower plastic sheet is provided with a third through hole and a fourth through hole corresponding to the first through hole and the second through hole respectively.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The first through hole is a stepped hole that is larger at the top and smaller at the bottom. The sealing plate matches the large hole of the stepped hole. The sealing plate is installed in the large hole and abuts against the step surface of the stepped hole.

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

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