Battery cell

Abstract

The utility model discloses a battery monomer, and belongs to the technical field of batteries, and the battery monomer comprises a shell which is provided with an accommodating cavity and a first opening communicated with the accommodating cavity; the first cover body covers the first opening; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a battery cell body, a first tab and a second tab, the first tab comprises a first gathering part connected with the battery cell body and a first connecting part connected with the first gathering part, and at least part of the first connecting part extends in the width direction of the first cover body and is electrically connected with the first cover body; the pole penetrates through the first cover body, the pole and the first cover body are insulated and spaced, and the pole is electrically connected with the second tab. According to the invention, the electric connection structure of the first tab side is simplified, a plurality of parts are omitted, the cost of the battery monomer is reduced, and the overcurrent capability of the battery monomer is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery cell. Background Technology

[0002] Currently, batteries typically integrate components such as the positive and negative terminals onto a cover plate. The positive and negative terminals require necessary insulation and sealing structures between themselves and the cover plate. Depending on the type of terminal fixing, structures such as riveting fittings are also needed. This not only makes the structure complex, but also limits the current-carrying capacity of the terminals due to their own size. Utility Model Content

[0003] Purpose of this application: This application provides a battery cell designed to overcome the aforementioned technical problems.

[0004] Technical solution: A battery cell according to an embodiment of this application includes:

[0005] A housing having a receiving cavity and a first opening communicating with the receiving cavity;

[0006] A first cover is disposed over the first opening;

[0007] An electrode assembly is disposed in the receiving cavity. The electrode assembly includes a battery cell body, a first electrode tab, and a second electrode tab. The first electrode tab includes a first gathering portion connected to the battery cell body and a first connecting portion connected to the first gathering portion. At least a portion of the first connecting portion extends along the width direction of the first cover and is electrically connected to the first cover.

[0008] A pole post is inserted through the first cover, and the pole post and the first cover are insulated from each other. The pole post is electrically connected to the second tab.

[0009] In some embodiments, the first connecting portion includes a first sub-portion and a second sub-portion, the first sub-portion being connected to the first gathering portion and extending toward the first cover, the second sub-portion being connected to the first sub-portion and extending along the width direction of the first cover, and the second sub-portion being electrically connected to the first cover.

[0010] In some embodiments, the second tab includes a second gathering portion connected to the cell body and a second connecting portion connected to the second gathering portion. The second connecting portion includes a third sub-part and a fourth sub-part. The third sub-part is connected to the second gathering portion and extends toward the first cover. The fourth sub-part is connected to the third sub-part and extends along the width direction of the first cover. The fourth sub-part is electrically connected to the electrode post.

[0011] In some embodiments, the electrode assembly is provided in multiple forms, and the multiple electrode assemblies are arranged along the width direction of the first cover.

[0012] In some embodiments, the battery cell further includes:

[0013] A first insulating element is arranged in a ring around the pole post, and the first insulating element is insulatingly spaced between the pole post and the first cover.

[0014] A second insulating element is disposed on the side of the first cover facing the battery cell body, and the second insulating element provides insulation between the first cover and the battery cell body.

[0015] In some embodiments, the first cover is provided with a liquid injection hole that communicates with the receiving cavity, and the liquid injection hole is located between the first tab and the second tab in the length direction of the first cover.

[0016] In some embodiments, the housing further has a second opening communicating with the receiving cavity;

[0017] The battery cell also includes a second cover and an explosion-proof valve disposed on the second cover, the second cover covering the second opening.

[0018] In some embodiments, the battery cell further includes a third insulating member, which is disposed on the side of the second cover facing the cell body. The third insulating member insulatingly separates the second cover and the cell body, and has an exhaust hole through the third insulating member facing the explosion-proof valve.

[0019] In some embodiments, the third insulating member has a groove on the side facing the explosion-proof valve, at least a portion of the explosion-proof valve is opposite the groove, and the vent is located on the groove wall.

[0020] In some embodiments, the battery cell further includes a support member connected to the side of the second cover facing the cell body, the support member being embedded in the groove, and the melting point of the support member being greater than the melting point of the third insulating member.

[0021] Beneficial Effects: The battery cell of this application embodiment includes a casing, a first cover, an electrode assembly, and a terminal post. The casing has a receiving cavity and a first opening communicating with the receiving cavity. The first cover is disposed on the first opening, and the electrode assembly is disposed in the receiving cavity. The electrode assembly includes a cell body, a first tab, and a second tab. The first tab includes a first gathering portion connected to the cell body and a first connecting portion connected to the first gathering portion. At least a portion of the first connecting portion extends along the width direction of the first cover and is electrically connected to the first cover. The terminal post passes through the first cover, and the terminal post and the first cover are insulated from each other. The terminal post is electrically connected to the second tab. The first tab is directly electrically connected to the first cover, that is, the first gathering portion is connected to the cell body, and the first cover is electrically connected through the first connecting portion extending in the width direction of the first cover. This ensures a full connection between the first tab and the first cover. Using the first cover as one pole of the battery cell and the terminal post as the other pole of the battery cell simplifies the electrical connection structure on the first tab side, eliminates multiple components, reduces the cost of the battery cell, and improves the current carrying capacity of the battery cell. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the first cover provided in an embodiment of this application;

[0026] Figure 4 for Figure 3 A sectional view along line AA.

[0027] Figure 5 for Figure 3 Sectional view along the BB line;

[0028] Figure 6 for Figure 3 A cross-sectional view along the CC line;

[0029] Figure 7 An exploded view of the second cover and the third insulating member provided in the embodiments of this application;

[0030] Reference numerals: 1. Shell; 10. Receiving cavity; 11. First opening; 12. Second opening; 2. First cover; 20. Electrode post hole; 21. Injection hole; 3. Electrode assembly; 30. Cell body; 31. First tab; 310. First gathering part; 311. First connecting part; 3110. First sub-part; 3111. Second sub-part; 32. Second tab; 320. Second gathering part; 321. Second connecting part; 3210. Third sub-part; 3211. Fourth sub-part; 4. Electrode post; 5. First insulating component; 6. Second insulating component; 7. Second cover; 70. Explosion-proof hole; 71. Support component; 8. Explosion-proof valve; 9. Third insulating component; 90. Vent hole; 91. Groove; X, width direction; Y, length direction; Z, thickness direction. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0033] Currently, batteries typically integrate components such as the positive and negative terminals onto a cover plate. The positive and negative terminals require necessary insulation and sealing structures between themselves and the cover plate. Depending on the type of terminal fixing, structures such as riveting fittings are also needed. This not only makes the structure complex, but also limits the current-carrying capacity of the terminals due to their own size.

[0034] In view of this, refer to Figures 1 to 7 This application provides a battery cell to overcome at least one of the above-mentioned technical problems.

[0035] Reference Figures 1 to 4 A single battery cell includes a housing 1, a first cover 2, an electrode assembly 3, and a terminal post 4.

[0036] It should be noted that in the following embodiments of this application, there are intersecting width direction X, length direction Y, and thickness direction Z. Among them, width direction X is the width direction X of the first cover 2, length direction Y is the length direction Y of the first cover 2, and thickness direction Z is the thickness direction Z of the first cover 2.

[0037] The housing 1 has a receiving cavity 10 and a first opening 11 communicating with the receiving cavity 10 in the thickness direction Z. A first cover 2 is disposed on the first opening 11, and an electrode assembly 3 is disposed in the receiving cavity 10. The electrode assembly 3 includes a cell body 30, a first tab 31, and a second tab 32. The first tab 31 includes a first gathering portion 310 connecting the cell body 30 and a first connecting portion 311 connecting the first gathering portion 310. At least a portion of the first connecting portion 311 extends along the width direction X of the first cover 2 and is electrically connected to the first cover 2. A terminal post 4 passes through the first cover 2 and is opposite to the second tab 32 in the thickness direction Z. The terminal post 4 and the first cover 2 are insulated from each other, and the terminal post 4 is electrically connected to the second tab 32.

[0038] The first tab 31 is directly electrically connected to the first cover 2, meaning the first gathering portion 310 connects to the cell body 30, and the first connecting portion 311 connects to the first cover 2. At least a portion of the first connecting portion 311 extends in the width direction X of the first cover 2, ensuring a full connection between the first tab 31 and the first cover 2. Using the first cover 2 as one pole of the battery cell and the terminal post 4 as the other pole of the battery cell simplifies the electrical connection structure on the first tab 31 side, eliminates multiple components, reduces the cost of the battery cell, and improves the current carrying capacity of the battery cell.

[0039] In some embodiments, refer to Figure 3 and Figure 4 The first connecting portion 311 includes a first sub-portion 3110 and a second sub-portion 3111. The first sub-portion 3110 is connected to the first gathering portion 310 and extends toward the first cover 2. The second sub-portion 3111 is connected to the first sub-portion 3110 and extends along the width direction X of the first cover 2. The second sub-portion 3111 is electrically connected to the first cover 2. By simplifying the connection structure between the first cover 2 and the battery cell body 30, the dimensions of the first connecting portion 311 of the first electrode tab 31 can be flexibly adjusted as needed, which helps to ensure the electrical connection stability and overcurrent capacity of the first electrode tab 31 as a whole and the first cover 2.

[0040] In some embodiments, refer to Figure 3 and Figure 6The second tab 32 includes a second gathering portion 320 connected to the cell body 30 and a second connecting portion 321 connected to the second gathering portion 320. The second connecting portion 321 includes a third sub-part 3210 and a fourth sub-part 3211. The third sub-part 3210 is connected to the second gathering portion 320 and extends toward the first cover 2. The fourth sub-part 3211 is connected to the third sub-part 3210 and extends along the width direction X of the first cover 2. The fourth sub-part 3211 is electrically connected to the terminal post 4. By simplifying the connection structure between the terminal post 4 and the cell body 30, the dimensions of the third sub-part 3210 and the fourth sub-part 3211 of the second tab 32 can be flexibly adjusted as needed, which helps to ensure the overall electrical connection stability and overcurrent capacity of the second tab 32 and the terminal post 4.

[0041] In some embodiments, in order to improve the energy storage capacity of a single battery cell, refer to Figures 2 to 6 Multiple electrode assemblies 3 are provided, and the multiple electrode assemblies 3 are arranged along the width direction X of the first cover 2. Correspondingly, the first cover 2 is connected to multiple first electrode tabs 31, and the electrode post 4 is connected to multiple second electrode tabs 32.

[0042] In some embodiments, to ensure insulation between the terminal post 4 and the first cover 2, and between the first cover 2 and the cell body 30, the battery cell further includes a first insulating member 5 and a second insulating member 6. The first insulating member 5 is arranged in a ring around the terminal post 4, and the first insulating member 5 is insulatingly spaced between the terminal post 4 and the first cover 2. The second insulating member 6 is disposed on the side of the first cover 2 facing the cell body 30, and the second insulating member 6 is insulatingly spaced between the first cover 2 and the cell body 30. The terminal post 4 can be connected to the first cover 2 by means of riveting or other methods. The first insulating member 5 and the second insulating member 6 ensure that the terminal post 4 and the first cover 2 are independently overcurrent, thereby improving the overcurrent stability of the battery cell.

[0043] In some embodiments, refer to Figure 2 , Figure 3 and Figure 5 The first cover 2 is provided with an injection hole 21, which connects to the receiving cavity 10. In the length direction Y of the first cover 2, the injection hole 21 is located between the first tab 31 and the second tab 32. By setting the injection hole 21 in a position that avoids the first tab 31 and the second tab 32, it is beneficial to avoid the electrolyte directly washing over the first tab 31 and the second tab 32 during the process of injecting electrolyte into the receiving cavity 10. This reduces the amount of lint on the first tab 31 and the second tab 32 washed away by the electrolyte and introduced into the receiving cavity 10, thereby reducing the risk of lint causing puncture or short circuit of the battery cell body 30 in the receiving cavity 10.

[0044] In some embodiments, refer to Figure 2 , Figure 5 and Figure 7The housing 1 also has a second opening 12 that connects to the receiving cavity 10 in the thickness direction Z. The battery cell also includes a second cover 7 and an explosion-proof valve 8 disposed on the second cover 7. The second cover 7 covers the second opening 12 and has an explosion-proof hole 70, within which the explosion-proof valve 8 is disposed. By placing the explosion-proof valve 8 on the side of the battery cell away from its own terminal post 4, thermoelectric separation is achieved, reducing the risk of damage to the battery cell's electrical connection structure in the event of thermal runaway.

[0045] In some embodiments, to improve the insulation effect between the second cover 7 and the cell body 30, refer to Figure 5 and Figure 7 The battery cell also includes a third insulating component 9, which is located on the side of the second cover 7 facing the cell body 30. The third insulating component 9 provides insulation between the second cover 7 and the cell body 30, and has a vent hole 90 extending through it towards the explosion-proof valve 8. The vent hole 90 helps prevent the third insulating component 9 from blocking the venting passage of the explosion-proof valve 8, thereby improving the explosion-proof effect of the battery cell.

[0046] In some embodiments, in order to further enhance the reference Figure 5 and Figure 7 The third insulating element 9 has a groove 91 on the side facing the explosion-proof valve 8, at least a portion of the explosion-proof valve 8 is directly opposite the groove 91, and the vent 90 is located on the groove wall of the groove 91. By placing the vent 90 on the groove wall of the groove 91, the risk of the explosion-proof valve 8 blocking the vent 90 when the battery cell experiences thermal runaway is further reduced, thus improving the pressure relief stability of the battery cell.

[0047] In some embodiments, refer to Figure 5 and Figure 7 The battery cell also includes a support member 71, which is connected to the side of the second cover 7 facing the cell body 30. The support member 71 is embedded in the groove 91, and its melting point is greater than that of the third insulating member 9. On the one hand, by embedding the support member 71 in the groove 91, the stability of the third insulating member 9 is improved, ensuring that the vent 90 is directly opposite the explosion-proof valve 8. On the other hand, by using the support member 71, whose melting point is greater than that of the third insulating member 9, in the event of thermal runaway in the battery cell, the third insulating member 9 melts before the support member 71. The support member 71 helps to maintain the support interval between the cell body 30 and the explosion-proof valve 8, preventing the cell body 30 from blocking the explosion-proof valve 8, and improving the pressure relief stability and safety of the battery cell.

[0048] The battery cell provided in the embodiments of this application has been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The housing (1) has a receiving cavity (10) and a first opening (11) communicating with the receiving cavity (10); The first cover (2) is provided on the first opening (11); An electrode assembly (3) is disposed in the receiving cavity (10). The electrode assembly (3) includes a battery cell body (30), a first electrode tab (31), and a second electrode tab (32). The first electrode tab (31) includes a first gathering portion (310) connected to the battery cell body (30) and a first connecting portion (311) connected to the first gathering portion (310). At least a portion of the first connecting portion (311) extends along the width direction (X) of the first cover (2) and is electrically connected to the first cover (2). The pole (4) is inserted through the first cover (2) and the pole (4) and the first cover (2) are insulated from each other. The pole (4) is electrically connected to the second tab (32).

2. The battery cell according to claim 1, characterized in that, The first connecting portion (311) includes a first sub-part (3110) and a second sub-part (3111). The first sub-part (3110) is connected to the first gathering portion (310) and extends toward the first cover (2). The second sub-part (3111) is connected to the first sub-part (3110) and extends along the width direction (X) of the first cover (2). The second sub-part (3111) is electrically connected to the first cover (2).

3. The battery cell according to claim 2, characterized in that, The second electrode tab (32) includes a second gathering portion (320) connected to the battery cell body (30) and a second connecting portion (321) connected to the second gathering portion (320). The second connecting portion (321) includes a third sub-part (3210) and a fourth sub-part (3211). The third sub-part (3210) is connected to the second gathering portion (320) and extends toward the first cover (2). The fourth sub-part (3211) is connected to the third sub-part (3210) and extends along the width direction (X) of the first cover (2). The fourth sub-part (3211) is electrically connected to the electrode post (4).

4. The battery cell according to claim 2, characterized in that, The electrode assembly (3) is provided in multiple ways, and the multiple electrode assemblies (3) are arranged along the width direction (X) of the first cover (2).

5. The battery cell according to claim 2, characterized in that, The battery cell also includes: A first insulating element (5) is arranged around the pole post (4), and the first insulating element (5) is insulatingly spaced between the pole post (4) and the first cover (2); A second insulating member (6) is disposed on the side of the first cover (2) facing the battery cell body (30), and the second insulating member (6) provides insulation between the first cover (2) and the battery cell body (30).

6. The battery cell according to claim 1, characterized in that, The first cover (2) is provided with a liquid injection hole (21), which is connected to the receiving cavity (10). In the length direction (Y) of the first cover (2), the liquid injection hole (21) is located between the first tab (31) and the second tab (32).

7. The battery cell according to any one of claims 1 to 6, characterized in that, The housing (1) also has a second opening (12) communicating with the receiving cavity (10); The battery cell also includes a second cover (7) and an explosion-proof valve (8) disposed on the second cover (7), the second cover (7) covering the second opening (12).

8. The battery cell according to claim 7, characterized in that, The battery cell also includes a third insulating member (9), which is disposed on the side of the second cover (7) facing the cell body (30). The third insulating member (9) insulates the second cover (7) and the cell body (30) and has an exhaust hole (90) through it facing the explosion-proof valve (8).

9. The battery cell according to claim 8, characterized in that, The third insulating member (9) has a groove (91) on the side facing the explosion-proof valve (8), at least a portion of the explosion-proof valve (8) is directly opposite the groove (91), and the exhaust hole (90) is located on the groove wall of the groove (91).

10. The battery cell according to claim 9, characterized in that, The battery cell also includes a support member (71), which is connected to the side of the second cover (7) facing the cell body (30). The support member (71) is embedded in the groove (91), and the melting point of the support member (71) is greater than the melting point of the third insulating member (9).

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