Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack, comprising: a housing, at least one end of which is opened, the inner wall surface of the housing comprising an embedding section and an accommodating section; the cover plate body is arranged in the opening, and the peripheral surface of the cover plate body is correspondingly matched with the embedding section; wherein the width of the cover plate body in the y direction is D, the inner width of the shell corresponding to the embedding section in the y direction is E, the inner width of the shell corresponding to the containing section in the y direction is F, and D is larger than or equal to F, and E-D is larger than 0 and smaller than or equal to 0.4 mm. According to the utility model, D is greater than or equal to F, when the cover plate body is assembled in the shell, the cover plate body is prevented from falling into the shell, the cover plate body and the shell are convenient to assemble, and laser is prevented from being hit into the accommodating space of the shell to damage a pole group when the cover plate body and the shell are welded; and E-D is more than 0 and less than or equal to 0.4 mm, so that the welding quality of the cover plate body and the shell is ensured while the cover plate body can be smoothly assembled into the shell from the opening.

Description

Technical Field

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

[0002] A battery consists of an internal structure, primarily comprising the electrode assembly, and an external structure, primarily comprising a battery casing, which provides space for the electrode assembly. The battery casing is typically assembled from a shell and a cover plate. The shell has an opening at at least one end, and the cover plate is positioned to correspond to the opening and welded to the shell to seal it. However, in the prior art, the mating relationship between the shell and the cover plate is not defined, resulting in difficulties in assembling the cover plate with the shell, and the quality of the weld is difficult to control. Utility Model Content

[0003] In view of this, the present invention provides a battery and a battery pack to solve the problems in the prior art that the cover plate is difficult to assemble with the shell and the welding quality is difficult to control.

[0004] In the first aspect, the utility model provides a battery, comprising: a shell, which is open at at least one end, and has a accommodating space therein, the inner wall surface of the shell comprising an embedding section and a accommodating section, the opening corresponds to the embedding section, and the accommodating section is located on the side of the embedding section away from the opening; a cover body, which is arranged in the opening, the outer peripheral surface of the cover body corresponds to the embedding section, and the side of the cover body away from the accommodating space is welded to the end face of the shell corresponding to the opening; wherein the width of the cover body in the y direction is D, the inner width of the shell in the y direction corresponding to the embedding section is E, and the inner width of the shell in the y direction corresponding to the accommodating section is F, satisfying D≥F, 0<ED≤0.4mm.

[0005] Beneficial effects: When D≥F, the cover body is prevented from falling into the shell when the cover body is assembled into the shell, which facilitates the assembly of the cover body and the shell, and avoids the laser hitting the accommodating space of the shell during welding of the cover body and the shell and damaging the pole group; when 0<ED≤0.4mm, the welding quality of the cover body and the shell is guaranteed while ensuring that the cover body can be smoothly assembled into the shell through the opening.

[0006] In an optional embodiment, the length of the cover body in the x direction is A, the inner length of the shell in the x direction corresponding to the engaging section is B, and the inner length of the shell in the x direction corresponding to the accommodating section is C, satisfying A≥C, 0<BA≤0.4mm.

[0007] Beneficial effects: A≥C prevents the cover body from falling into the shell when the cover body is assembled into the shell, facilitates the assembly of the cover body and the shell, and avoids the laser hitting the accommodating space of the shell during welding of the cover body and the shell, thereby damaging the pole group; 0<BA≤0.4mm ensures that the cover body can be smoothly assembled into the shell through the opening while ensuring the welding quality of the cover body and the shell.

[0008] In an optional embodiment, the thickness of the cover plate body in the z direction is t, and the depth of the engaging section in the z direction is d, which satisfies 90%≤t / d≤110%.

[0009] Beneficial effects: 90%≤t / d≤110%, the fit between the cover body and the shell is relatively high, after the cover body is inserted into the shell, the side of the cover body away from the accommodating space will not be too much higher than the end face of the shell, and at the same time, the size of the cover body sunk into the shell will not be too large, thereby ensuring good welding quality, and is less likely to cause problems such as hole explosion and cold welding, and has high welding strength and welding yield rate.

[0010] In an optional embodiment, the shell includes two first side panels that are relatively spaced apart and two second side panels that are relatively spaced apart, and the first side panels and the second side panels are connected in sequence along the circumference of the opening, and the inner wall surfaces of the first side panels and the inner wall surfaces of the second side panels are both formed with the embedding section and the accommodating section.

[0011] Beneficial effect: Each inner wall surface of the shell forms an embedding section and a receiving section, ensuring that the four sides of the pole group will not be burned by the laser when the cover body and the shell are welded.

[0012] In an optional embodiment, the inner wall surface of the shell further includes a transition connecting section, and the transition connecting section is connected between the embedding section and the accommodating section.

[0013] In an optional embodiment, a boss is provided on one side of the cover body facing the accommodating space, the boss forms a guide portion along the circumferential direction, and the boss extends from the opening into the shell and cooperates with the transition connection section.

[0014] Beneficial effects: The guide portion along the circumference of the boss facilitates the assembly of the cover body into the shell through the opening of the shell, and facilitates positioning of the cover body into the shell through the transition connection section.

[0015] In an optional embodiment, the transition connecting section is an inclined step surface, and the guide portion is a chamfered surface or a rounded surface.

[0016] In an optional embodiment, the battery further includes a pole group, which is arranged in the accommodating space, and the pole group includes a pole ear, which is arranged toward the side of the shell opposite to the opening, and an insulating member is provided between the end face of the pole group on one side with the pole ear and the side of the shell opposite to the opening, and the other end face of the pole group, which is arranged away from the end face of the pole group on the one side with the pole ear, abuts against the side of the boss facing the accommodating space.

[0017] Beneficial effect: By arranging the insulating part, the four corners of the pole group corresponding to the end face on one side of the pole group with the pole ear are away from the inner corner of the shell, thereby avoiding interference with the inner corner of the shell; by setting the guide part as a chamfered surface or a rounded surface, the four corners of the pole group corresponding to the end face on the other side of the pole group facing away from the end face on one side of the pole group with the pole ear are away from the connection between the cover body and the shell, thereby avoiding interference with the shell and the cover body.

[0018] In an optional embodiment, a pole hole is provided on a surface of the shell opposite to the opening and / or on the cover body; and / or an explosion-proof valve hole is provided on a surface of the shell opposite to the opening and / or on the cover body; and / or the four corners of the cover body along the circumferential direction are all rounded structures.

[0019] In a second aspect, the present invention further provides a battery pack comprising the battery described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the exploded structure of a cover plate and a shell of a battery according to an embodiment of the present utility model;

[0022] Figure 2 A top view of a cover and a housing of a battery according to an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0024] Figure 4 for Figure 3 A partial enlarged schematic diagram of center C;

[0025] Figure 5 for Figure 4Dimensioning diagram of the structure;

[0026] Figure 6 for Figure 2 Cross-sectional view in the middle BB direction;

[0027] Figure 7 for Figure 6 A partial enlarged schematic diagram of D in the middle;

[0028] Figure 8 for Figure 7 Dimensioning diagram of the structure;

[0029] Figure 9 This is a cross-sectional view of a battery in the xz plane according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Shell; 11. Accommodation space; 12. Embedding section; 13. Accommodation section; 14. First side plate; 15. Second side plate; 16. Transition connection section; 17. Pole hole; 18. Explosion-proof valve hole; 2. Cover plate body; 3. Boss; 31. Guide part; 4. Pole group; 41. Pole ear; 5. Insulator. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] The following combination Figures 1 to 9 , describing the embodiments of the present utility model.

[0034] According to an embodiment of the present utility model, on the one hand, a battery is provided, comprising: a shell 1, which is open at at least one end, and has a accommodating space 11 inside the shell 1, the inner wall surface of the shell 1 includes an embedding section 12 and an accommodating section 13, the opening corresponds to the embedding section 12, and the accommodating section 13 is located on the side of the embedding section 12 away from the opening; a cover body 2 is arranged in the opening, the outer peripheral surface of the cover body 2 corresponds to the embedding section 12, and the side of the cover body 2 away from the accommodating space 11 is welded to the end face of the shell 1 corresponding to the opening.

[0035] Among them, Figure 3 and Figure 5As shown, the length of the cover body 2 in the x direction is A, the inner length of the shell 1 corresponding to the engaging section 12 in the x direction is B, and the inner length of the shell 1 corresponding to the accommodating section 13 in the x direction is C, satisfying A≥C, 0<BA≤0.4mm.

[0036] A≥C prevents the cover body 2 from falling into the shell 1 when the cover body 2 is assembled into the shell 1, facilitates the assembly of the cover body 2 and the shell 1, and prevents the laser from hitting the accommodating space 11 of the shell 1 and damaging the pole group when the cover body 2 and the shell 1 are welded; 0<BA≤0.4mm ensures that the cover body 2 can be smoothly assembled into the shell 1 through the opening while ensuring the welding quality of the cover body 2 and the shell 1.

[0037] It is worth noting that when A≥C, the laser that leaks into the gap between the cover body 2 and the shell 1 during laser welding is blocked by the corresponding wall thickness of the shell 1 at the accommodating section 13, thus preventing the laser from hitting the electrode group and burning the electrode group.

[0038] It is worth noting that if the value of BA is a negative number, that is, the length of the cover body 2 is greater than the inner length of the shell 1 at the splicing section 12, the cover body 2 cannot be assembled into the shell 1; if the value of BA is too large, the gap between the cover body 2 and the splicing section 12 is too large, and quality problems such as explosion points are likely to occur during laser welding of the cover body 2 and the shell 1.

[0039] In one embodiment, Figure 6 and Figure 8 As shown, the width of the cover body 2 in the y direction is D, the inner width of the shell 1 corresponding to the engaging section 12 in the y direction is E, and the inner width of the shell 1 corresponding to the accommodating section 13 in the y direction is F, satisfying D≥F, 0<ED≤0.4mm.

[0040] Make D≥F, when the cover body 2 is assembled into the shell 1, prevent the cover body 2 from falling into the shell 1, facilitate the assembly of the cover body 2 and the shell 1, and avoid the laser hitting the accommodating space 11 of the shell 1 during welding of the cover body 2 and the shell 1 and damaging the pole group; make 0<ED≤0.4mm, while ensuring that the cover body 2 can be smoothly assembled into the shell 1 through the opening, at the same time, ensure the welding quality of the cover body 2 and the shell 1.

[0041] It is worth noting that when D≥F, when the cover body 2 and the shell 1 are laser welded, the laser leaking into the gap between the cover body 2 and the shell 1 is blocked by the corresponding wall thickness of the shell 1 at the accommodating section 13, preventing the laser from hitting the electrode group and burning the electrode group.

[0042] It is worth noting that if the value of ED is a negative number, that is, the width of the cover body 2 is greater than the inner width of the shell 1 at the splicing section 12, the cover body 2 cannot be assembled into the shell 1; if the value of ED is too large, the gap between the cover body 2 and the splicing section 12 is too large, and quality problems such as explosion points are likely to occur during laser welding of the cover body 2 and the shell 1.

[0043] In one embodiment, Figure 5 As shown, the thickness of the cover body 2 in the z direction is t, and the depth of the engaging section 12 in the z direction is d, satisfying 90% ≤ t / d ≤ 110%. When 90% ≤ t / d ≤ 110% is achieved, the fit between the cover body 2 and the housing 1 is high. After the cover body 2 is inserted into the housing, the side of the cover body 2 facing away from the accommodation space 11 does not protrude excessively from the end face of the housing 1. At the same time, the depth of the cover body 2 sunk into the housing 1 does not exceed too much, thereby ensuring good welding quality, preventing problems such as blowholes and cold welds, and achieving high welding strength and a high weld yield rate.

[0044] The following observations and tests were conducted on the assembly of cover bodies 2 with different thicknesses t and housings 1 with different depths d. The results of the Examples and Comparative Examples are shown in Table 1. The Examples refer to batteries whose t and d meet the requirements of the Examples, while the Comparative Examples refer to batteries whose t and d do not meet the requirements of the Examples.

[0045] Table 1 Observation and test results of assembly of cover bodies with different thicknesses t and shells with different depths d

[0046]

[0047] In one embodiment, Figure 1 As shown, the housing 1 includes two first side panels 14 and two second side panels 15 spaced apart from each other. The first and second side panels 14, 15 are sequentially connected along the circumference of the opening. The inner walls of the first and second side panels 14, 15 are each formed with an engaging section 12 and a receiving section 13. The formation of the engaging section 12 and receiving section 13 on each inner wall of the housing 1 ensures that the electrode assembly is protected from laser burns when the cover body 2 and the housing 1 are welded.

[0048] In one embodiment, Figure 4 and Figure 7 As shown, the inner wall of the housing 1 also includes a transition section 16, which connects between the splicing section 12 and the accommodating section 13. That is, the inner wall of the housing 1 is formed in sequence from the opening of the housing 1 to the interior of the housing 1, forming the splicing section 12, the transition section 16, and the accommodating section 13. The splicing section 12 cooperates with the cover body 2, the accommodating section 13 is used to cooperate with the pole group, and the transition section 16 is used to transitionally connect the splicing section 12 and the accommodating section 13.

[0049] In one embodiment, Figure 1 、 Figure 4 and Figure 7 As shown, the cover body 2 is provided with a boss 3 on the side facing the accommodating space 11. The boss 3 forms a guide portion 31 along its circumference. The boss 3 extends from the opening into the housing 1 and engages with the transition section 16. The guide portion 31 along the circumference of the boss 3 facilitates the insertion of the cover body 2 into the housing 1 through the opening, and facilitates positioning of the cover body 2 into the housing through the transition section 16.

[0050] It is worth noting that the cover plate body 2 and the boss 3 are combined to form the cover plate.

[0051] In one embodiment, Figure 4 and Figure 7 As shown, the transition section 16 is an inclined step surface, and the guide portion 31 is a chamfered surface or a rounded surface.

[0052] In one embodiment, Figure 2 As shown, the four corners of the cover body 2 along the circumferential direction are all rounded structures.

[0053] It is worth noting that the cover body 2 and the housing 1 at the rounded corner structure can be a clearance fit or an interference fit.

[0054] In one embodiment, Figure 3 As shown, a pole hole 17 is provided on a surface of the housing 1 opposite to the opening.

[0055] In one embodiment, Figure 3 As shown, an explosion-proof valve hole 18 is provided on the side of the housing 1 opposite to the opening.

[0056] It is worth noting that, in this embodiment, Figure 4 As shown, an opening is formed at one end of the shell 1, and the other end of the shell 1 opposite to the opening is a closed surface, and the pole hole 17 and the explosion-proof valve hole 18 are opened on the closed surface.

[0057] Of course, in other alternative embodiments, the explosion-proof valve hole 18 and / or the pole hole 17 can be opened only on the cover body 2; or, the explosion-proof valve hole 18 and / or the pole hole 17 can be opened on the closed surface of the shell 1 and the cover body 2.

[0058] As an alternative embodiment, both opposite ends of the housing 1 may be open, that is, two openings are formed at the opposite ends of the housing 1. Accordingly, two cover bodies 2 are provided, and the two cover bodies 2 are respectively provided corresponding to the two openings.

[0059] In one embodiment, Figure 9As shown, the battery further includes an electrode group, which is disposed in the accommodation space 11. Specifically, the electrode group is disposed in conjunction with the accommodation section 13.

[0060] Specifically, such as Figure 9 As shown, the pole group 4 includes a pole ear 41, which is arranged toward the side of the shell 1 opposite to the opening. An insulating member 5 is provided between the end face of the pole group 4 on one side with the pole ear 41 and the side of the shell 1 opposite to the opening. The other end face of the pole group 4, which is arranged away from the end face of the pole ear 41, abuts against the side of the boss 3 facing the accommodating space 11.

[0061] By providing the insulating member 5, the four corners of the pole group 4 corresponding to the end face on one side of the pole group 4 provided with the pole ear 41 are away from the inner corner of the shell 1, thereby avoiding interference with the inner corner of the shell 1; by providing the guide portion 31 as a chamfered surface or a rounded surface, the four corners of the pole group 4 corresponding to the end face on the other side of the pole group 4 provided with the pole ear 41 are away from the connection between the cover body 2 and the shell 1, thereby avoiding interference with the shell 1 and the cover body 2.

[0062] It is worth noting that, in the related art, the shell 1 and the cover plate are combined to form the outer shell of the battery, and the pole group 4 is arranged in the outer shell. An insulating member 5 is arranged between the side of the pole group 4 provided with the pole ear 41 and an inner side surface of the corresponding outer shell, and a bottom support plate is arranged between the other side of the pole group 4 that is arranged away from the side of the pole ear 41 and the other inner side surface of the corresponding outer shell, so that the eight sharp corners of the pole group 4 are away from the eight inner corners of the shell 1 to avoid interference.

[0063] However, in this embodiment, the boss 3 is formed with a guide portion 31 along the circumferential direction, and the guide portion 31 is a chamfered surface or a rounded surface. Therefore, the other side of the electrode group 4 that is opposite to the side where the pole ear 41 is provided can directly abut against the boss 3 without the need for an additional bottom support plate. Therefore, the overall structure of the battery is simplified, the cost is reduced, the utilization rate of the internal space of the battery is improved, and the energy density of the battery is improved.

[0064] Please note that Figure 9 The end face of the pole group 4 with the pole ear 41 is Figure 9 The lower end face of the middle electrode group 4, and correspondingly, the end face of the electrode group 4 which is provided with the electrode ear 41 and is disposed away from the end face of the other side is Figure 9 The upper end surface of the middle electrode group 4.

[0065] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising the battery described above.

[0066] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A shell having an opening at at least one end, wherein the shell has an accommodation space therein, wherein the inner wall surface of the shell includes an inlay section and an accommodation section, wherein the opening corresponds to the inlay section, and the accommodation section is located on a side of the inlay section away from the opening; a cover body disposed in the opening, wherein the outer peripheral surface of the cover body corresponds to the engaging section, and a surface of the cover body away from the accommodating space is welded to an end surface of the housing corresponding to the opening; The width of the cover body in the y direction is D, the inner width of the shell in the y direction corresponding to the engaging section is E, and the inner width of the shell in the y direction corresponding to the accommodating section is F, satisfying D≥F, 0<ED≤0.4mm.

2. The battery according to claim 1, characterized in that The length of the cover body in the x direction is A, the inner length of the shell corresponding to the engaging section in the x direction is B, and the inner length of the shell corresponding to the accommodating section in the x direction is C, satisfying A≥C, 0<BA≤0.4mm.

3. The battery according to claim 1 or 2, characterized in that The thickness of the cover plate body in the z direction is t, and the depth of the engaging section in the z direction is d, which satisfies 90%≤t / d≤110%.

4. The battery according to claim 1 or 2, characterized in that The shell includes two first side plates arranged relatively at intervals and two second side plates arranged relatively at intervals. The first side plates and the second side plates are connected in sequence along the circumference of the opening, and the inner wall surfaces of the first side plates and the inner wall surfaces of the second side plates are both formed with the embedding section and the accommodating section.

5. The battery according to claim 1 or 2, characterized in that The inner wall surface of the shell further includes a transition connecting section, which is connected between the embedding section and the accommodating section.

6. The battery according to claim 5, characterized in that A boss is provided on one side of the cover body facing the accommodating space, and the boss forms a guide portion along the circumferential direction. The boss extends from the opening into the shell and cooperates with the transition connecting section.

7. The battery according to claim 6, characterized in that The transition connecting section is an inclined step surface, and the guide portion is a chamfered surface or a rounded surface.

8. The battery according to claim 7, characterized in that The battery also includes a pole group, which is arranged in the accommodating space. The pole group includes a pole ear, which is arranged toward a side of the shell opposite to the opening. An insulating member is provided between an end face of the pole group on one side with the pole ear and a side of the shell opposite to the opening. The other end face of the pole group, which is arranged away from the end face of the pole group on the one side with the pole ear, abuts against a side of the boss facing the accommodating space.

9. The battery according to claim 1 or 2, characterized in that A pole hole is provided on the surface of the housing opposite to the opening and / or on the cover body; and / or, An explosion-proof valve hole is provided on the surface of the housing opposite to the opening and / or on the cover body; and / or, The four corners of the cover plate body along the circumferential direction are all rounded structures.

10. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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