Battery

Abstract

The invention provides a battery which comprises a shell, a battery cell, a support and a supporting piece, the battery cell, the support and the supporting piece are all located in the shell, the battery cell comprises a battery cell body and a pole lug, the shell is provided with a first wall face, the support comprises two branch parts and a bottom plate connected between the two branch parts, the same sides of the bottom plate and the two branch parts are supported on the first wall face, and in the first direction, the pole lug is arranged between the two branch parts. The two branch parts are arranged at an interval, a tab accommodating cavity is formed between the two branch parts, the tab extends into the tab accommodating cavity from the battery cell body, the supporting piece is used for being mounted in the tab accommodating cavity, in the first direction, the maximum length of the supporting piece is L1, the distance between the two branch parts is L2, and L1 is greater than L2, so that the two sides of the supporting piece are propped against the two branch parts respectively after the supporting piece is mounted in the tab accommodating cavity; 30.5 mm < = L1 < = 205 mm, and 30 mm < = L1 < = 200 mm. The anti-deformation capability of the shell of the battery is relatively good.

Description

[0001] This application is a divisional application based on the original invention patent application number: 2024115254095, the application date is October 30, 2024, and the application name is "A Battery". Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0003] The battery shell is easily deformed due to the weight of the battery cell, riveting of the poles, opening of the injection hole, injection, etc., which is not conducive to the service life and safety of the battery. Especially for batteries with thinner shells, the shell deformation is more obvious. In view of this, how to reduce the deformation of the shell is a technical problem that needs to be solved by technicians in this field. Summary of the invention

[0004] To solve the above technical problems, the present application provides a battery, comprising a shell, a battery cell, a bracket and a support member, wherein the battery cell, the bracket and the support member are all located in the shell, the battery cell comprises a battery cell body and a pole ear, the bracket is located on the side of the battery cell where the pole ear is provided, the shell has a first wall surface, the bracket comprises two branches, one end of the two branches is fixed to the first wall surface, and the other end extends in a direction away from the first wall surface, in the first direction, the two branches are arranged at intervals and a pole ear accommodating cavity is formed therebetween, the pole ear extends from the battery cell body into the pole ear accommodating cavity, the support member is used to be installed in the pole ear accommodating cavity, in the first direction, the maximum length of the support member is L1, the spacing between the two branches is L2, L1>L2, so that after the support member is installed in the pole ear accommodating cavity, the two sides respectively press the two branches, 30.5mm≤L1≤205mm, 30mm≤L1≤200mm.

[0005] In the present application, since the maximum length L1 of the support member in the first direction is greater than the spacing L2 between the first branch and the second branch of the bracket, the two sides of the support member will respectively press against the two branches after being installed in the ear accommodating cavity between the two branches, so that the two branches fixed to the first wall of the shell can more effectively support the first wall of the shell, thereby improving the shell's anti-deformation ability and reducing the deformation of the shell caused by the weight of the battery cell, riveting the pole assembly, opening the injection hole, injection, etc., thereby extending the service life of the battery and improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A three-dimensional diagram of an embodiment of a battery provided in the present application;

[0007] Figure 2 for Figure 1Floor plan of

[0008] Figure 3 for Figure 1 An exploded schematic diagram of the housing and battery cell;

[0009] Figure 4 for Figure 1 A three-dimensional diagram showing the location of a bracket;

[0010] Figure 5 The figure is a schematic diagram of an exploded view of a bracket;

[0011] Figure 6 for Figure 4 Floor plan of

[0012] Figure 7 is the plan view of the second support plate;

[0013] Figure 8 This is a plan view of the two branches and the base plate.

[0014] The following are the descriptions of the reference numerals:

[0015] 1 shell, 11 shell body, 12 cover plate, 1a first wall surface, 1b second wall surface, A liquid injection hole, B pole riveting hole;

[0016] 2 battery cell, 21 battery cell body, 22 positive electrode tab, 23 negative electrode tab;

[0017] 3 bracket, 31 branch portion, 311 base portion, 312 extension portion, 32 tab accommodating cavity, 33 bottom plate, 34 flexible connection portion;

[0018] 4 support member, 41 first support plate, 42 second support plate;

[0019] 51 is the positive pole, 52 is the negative pole. DETAILED DESCRIPTION

[0020] The present application provides a battery. In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1-Figure 4 As shown, the battery comprises a housing 1, a battery cell 2, a bracket 3, a support member 4 and a pole. The pole comprises a positive pole 51 and a negative pole 52.

[0022] In the illustrated embodiment, the housing 1 includes a housing body 11 and a cover plate 12. An opening is provided on one side of the housing body 11 in the thickness direction. The cover plate 12 closes the opening of the housing body 11. The cover plate 12 and the housing body 11 together form a receiving cavity. In another embodiment, openings are provided at both ends of the housing body 11 in the length direction. Two cover plates 12 close the openings at both ends of the housing body 11 respectively. The two cover plates 12 and the housing body 11 together form a receiving cavity.

[0023] The battery cell 2 is located in the housing 1. The battery cell 2 includes a battery cell body 21 and a tab extending from the battery cell body 21. The tab includes a positive tab 22 and a negative tab 23. In the illustrated embodiment, the positive tab 22 and the negative tab 23 are respectively extended from opposite sides of the battery cell body 21. The battery cell body 21 includes a positive electrode sheet and a negative electrode sheet, which are arranged alternately one by one, and a diaphragm is provided between adjacent positive electrode sheets and negative electrode sheets. In some embodiments, the positive electrode sheets and the negative electrode sheets are arranged alternately one by one along the thickness direction of the battery, so that the battery cell body 21 is a laminated structure. In some embodiments, the positive electrode sheets and the negative electrode sheets are wound, and the positive electrode sheets and the negative electrode sheets are arranged alternately one by one along a direction perpendicular to the winding center line, so that the battery cell body 21 is a rolled structure. The structures of the positive electrode sheets and the negative electrode sheets are similar, and both include a current collector and an active material layer coated on both sides of the current collector. The part of the current collector of the positive electrode sheet that is not coated with the active material protrudes from the part that is coated with the active material to form a positive electrode tab single piece. Multiple layers of positive electrode tab single pieces are stacked to form a positive electrode tab 22. The part of the current collector of the negative electrode sheet that is not coated with the active material protrudes from the part that is coated with the active material to form a negative electrode tab single piece. Multiple layers of negative electrode tab single pieces are stacked to form a negative electrode tab 23.

[0024] The positive electrode tab 22 is welded to the positive electrode post 51 to achieve electrical connection, or the positive electrode tab 22 and the positive electrode post 51 are respectively welded to the positive electrode adapter to achieve electrical connection. The negative electrode tab 23 is welded to the negative electrode post 52 to achieve electrical connection, or the negative electrode tab 23 and the negative electrode post 52 are respectively welded to the negative electrode adapter to achieve electrical connection.

[0025] The bracket 3 is located in the shell 1. The bracket 3 is located on the side of the battery cell 2 where the pole tab is provided. When the positive pole tab 22 and the negative pole tab 23 are respectively led out from the opposite sides of the battery cell body 21, a bracket 3 can be provided on each side of the battery cell body 21. The bracket 3 is located on the side of the battery cell 2 where the pole tab is provided to limit the battery cell 2, to prevent the end face of the side of the battery cell 2 where the pole tab is provided (the end face is not covered with an insulating film) from accidentally touching the shell 1 and causing a short circuit. At the same time, the bracket 3 also has a gathering effect on the pole tab, to prevent the pole tab from accidentally touching the shell 1 and causing a short circuit.

[0026] like Figure 4As shown, the bracket 3 includes two branches 31, the two branches 31 are spaced apart in the first direction, and a tab accommodating cavity 32 is formed between the two branches 31, and the tab extends from the battery body 21 to the tab accommodating cavity 32. The shell 1 has a first wall 1a, one end of the two branches 31 is fixed to the first wall 1a, and the other end extends in a direction away from the first wall 1a. Specifically, the two branches 31 can be directly fixed to the first wall 1a, or the two branches 31 can be fixed to a plate, and the plate is fixed to the first wall 1a through the pole. In the illustrated embodiment, the shell 1 is roughly rectangular, and the shell 1 has two large-area walls and four small-area walls, the two large-area walls are parallel, and the two large-area walls are spaced apart in the second direction, the second direction is perpendicular to the first direction, and the four small-area walls are connected between the edges of the two large-area walls. The first wall 1a is one of the large-area walls. In the illustrated embodiment, the cover plate 12 forms a large-area wall surface, which is the first wall surface 1a, and the side wall of the shell body 11 away from the cover plate 12 forms another large-area wall surface, which is the second wall surface 1b.

[0027] The support member 4 is used to be installed in the tab accommodation cavity 32. Figure 7 As shown, in the first direction, the maximum length of the support member 4 is L1. Figure 8 As shown, when the support part 4 is not assembled in the tab accommodating cavity 32, the distance between the two branches 31 is L2. L1>L2, so that after the support member 4 is installed in the tab accommodating cavity 32, the two sides of the support member 4 respectively press the two branches 31, so that the two branches 31 are subjected to the thrust from the support member 4 away from each other, and then when it is transmitted to the first wall surface 1a, the position of the first wall surface 1a corresponding to the two branches 31 is subjected to the thrust away from the battery cell 2, so that the first wall surface 1a located between the two branches 31 has a bending tendency close to the battery cell, thereby offsetting part of the shell deformation caused by the weight of the battery cell 2, thereby extending the service life of the battery and improving the safety of the battery.

[0028] In some embodiments, an injection hole A is provided on the first wall 1a, and the injection hole A at least partially coincides with the orthographic projection of the bracket 3 on the first wall 1a. In this design, the bracket 3 can effectively support the injection hole A during injection to prevent deformation of the shell during the injection process.

[0029] In some embodiments, the pole riveting hole B at least partially coincides with the orthographic projection of the bracket 3 on the first wall surface 1 a , which is more conducive to reducing the deformation of the first wall surface 1 a during the riveting process of the pole.

[0030] In some embodiments, 1<L1 / L2≤1.05. The preferred range of L1 is: 30.5mm≤L1≤205mm, and the specific value of L1 can be 30.5mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 205mm. In this embodiment, L1 is preferably 71.1mm; the preferred range of L2 is: 30mm≤L2≤200mm, and the specific value of L2 can be: 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 180mm, 190mm, 200mm; in this embodiment, L2 is preferably 70.6mm.

[0031] By controlling L1 / L2 within the above range, the support member 4 can generate sufficient supporting force on the branch 31, so that the branch 31 has sufficient support on the first wall 1a to prevent the shell 1 from deforming. If L1 / L2 is too small, the support member 4 cannot generate sufficient supporting force on the branch 31, and thus cannot play a role in preventing the shell from deforming. When L1 / L2 is too large, it means that the length of the support member 4 is too large. After being stuck between the two branches 31, it will cause the branch 31 to deform too much, resulting in a reduction in the internal space of the shell 1, thereby reducing the energy density of the single battery.

[0032] In some embodiments, in the first direction, the length of the battery cell 2 is L (see Figure 4 ), the length of bracket 3 is L3 (see Figure 4), 0.9≤L3 / L≤1. If L3 / L is too small, the two side areas of the first wall 1a in the first direction cannot be reliably supported by the two branches 31, resulting in insufficient support force in the shell area corresponding to the two branches, which is not conducive to improving the anti-deformation ability of the first wall 1a. If L3 / L is too large, the support member 4 and the bracket 3 will occupy more of the internal space of the shell 1, resulting in a reduction in the layout space of the battery cell 2, resulting in a low capacity density of the battery. Due to the limitation of the shell, when the length of the bracket 3 in the first direction is too long, the length of the support member 4 is limited, and the ratio of L1 / L2 is too small, resulting in insufficient support force and poor anti-deformation ability of the first wall. 0.9≤L3 / L≤1 can take into account both the capacity density of the battery and the anti-deformation ability of the shell 1. When 0.9≤L3 / L≤1, the range of L1 / L2 can be configured as: 1≤L1 / L2≤1.02. When L1 / L2 is within this range, the support member 4 can not only provide support for the branch 31, but also prevent the deformation of the branch 31 from interfering with the shell. Specifically, the range of L can be: 80≤L≤120mm; for example, L can be equal to 80mm, 90mm, 100mm, 110mm, 120mm, and preferably 98mm in this embodiment. The range of L3 can be: 79mm≤L3≤119mm. For example, L3 can be equal to 79mm, 89mm, 99mm, 109mm, 119mm, and preferably 96.5mm in this embodiment.

[0033] In some embodiments, the ratio of the weight of the battery cell 2 (in kg) to the thickness of the first wall 1a (in mm) is C, 4kg / mm≤C≤6kg / mm. It should be noted that the weight of the battery cell 2 is the weight of the battery cell before it is soaked in electrolyte or after the battery is disassembled, the battery cell is taken out, and vacuum dried at 80°C for 72 hours. When the value of C is within this range, it means that the battery weight per unit thickness of the first wall 1a is within a reasonable range, the first wall 1a can provide a large support force for the battery cell, and the deformation is small. Therefore, L1 / L2 can be controlled within a small range, for example: 1≤L1 / L2≤1.02; at this time, the two branches 31 on the first wall 1a generate a certain support force on the first wall 1a under the action of the support member 4, so that the partial deformation of the first wall 1a is to enhance the deformation of the first wall 1a caused by the weight of the battery cell or the impact caused by the shaking of the battery cell, thereby reducing the deformation of the first wall 1a of the shell and improving the safety of the battery. For example, in this embodiment, the weight of the battery cell may be 1.793 kg, and the thickness of the first wall surface 1 a may be 0.3 mm.

[0034] In some embodiments, the ratio of the weight of the battery cell 2 (in kg) to the thickness of the first wall 1a (in mm) is C, 6kg / mm≤C≤10kg / mm. When the value of C is within this range, it means that the weight of the battery per unit thickness of the first wall 1a is heavier, the first wall 1a has limited support force on the battery cell, and the deformation is large. Therefore, L1 / L2 can be controlled within a larger range at this time, for example: 1.02≤L1 / L2≤1.05; when L1 / L2 is within this range, the support force of the support member 4 on the branch 31 is large, and the deformation of the first wall 1a corresponding to the two branches 31 is large under the action of the branch 31, which can offset most of the deformation of the first wall 1a caused by the weight of the battery cell.

[0035] In some embodiments, in the second direction, the ratio of the height of the branch 31 to the distance between the first wall 1a and the second wall 1b corresponding to the branch 31 is D, and 0.7≤D≤1. When the value of D is within this range, it means that the height of the branch 31 accounts for a large proportion. In this case, if the first wall 1a is slightly deformed, the side of the branch 31 away from the first wall 1a will contact the second wall 1b. At this time, the second wall 1b can indirectly support the first wall 1a through the branch 31, so that the first wall 1a will not continue to deform. Therefore, L1 / L2 can be controlled within a smaller range, for example: 1≤L1 / L2≤1.015. In the illustrated embodiment, the two ends of the second wall 1b are recessed toward the first wall 1a to form a recessed area, and the middle of the second wall 1b is convex in the direction away from the first wall 1a to form a convex area. The bracket 3 is located between the recessed area and the first wall 1a, and the distance between the first wall 1a and the second wall 1b corresponding to the bracket 3 is the distance between the recessed area of ​​the first wall 1a and the second wall 1b.

[0036] In some embodiments, the wall thickness of the housing 1 is H, 0.2 mm ≤ H ≤ 0.4 mm, for example, H can be equal to 0.3 mm. When the value of H is within this range, it means that the wall thickness of the housing is relatively thin. In this case, the housing 1 is more easily deformed. Therefore, L1 / L2 can be controlled within a larger range, for example: 1.005 ≤ L1 / L2 ≤ 1.035.

[0037] In the illustrated embodiment, the branch 31 includes a base portion 311 and an extension portion 312, and one side of the base portion 311 is supported on the first wall surface 1a. The extension portion 312 extends from one end of the base portion 311 away from the first wall surface 1a in a direction away from the first wall surface 1a. The support member 4 includes a first support plate 41 and a second support plate 42. The first support plate 41 is installed between the two base portions 311. The pole tab in the pole tab accommodating cavity 32 is located between the first support plate 41 and the first wall surface 1a. At least a portion of the second support plate 42 extends from the first support plate 41 in a direction away from the first wall surface 1a. The second support plate 42 is located between the two extension portions 312. In the illustrated embodiment, the extension portion 312 extends from an end surface of the base portion 311 away from the first wall surface 1a and close to the battery body 21 in a direction away from the first wall surface 1a, so that the extension portion 312 can contact the end surface of the battery body 21 where the pole tab is led out, thereby preventing the battery body 21 from being damaged. In the illustrated embodiment, the second support plate 42 is located on a side of the first support plate 41 close to the cell body 21 .

[0038] Moreover, the maximum length position of the support member 4 is located on the side of the second support plate 42 away from the first wall surface 1a. After the support member 4 is assembled in the tab accommodating cavity 32, the maximum length position of the support member 4 presses against the two extension portions 312, so that the force arm of the pressing point relative to the branch portion 31 is larger, and a smaller pressing force can make the branch portion 31 have a larger deflection tendency. The greater the deflection tendency of the branch portion 31, the better the supporting effect on the first wall surface 1a. In this way, a smaller pressing force can make the branch portion 31 have a better supporting effect on the first wall surface 1a, and the smaller the pressing force, the smaller the stress generated on the branch portion 31.

[0039] In the illustrated embodiment, a buckle X is provided on one side of the base portion 311 close to the tab accommodating cavity 32 , and a clamping portion Y is provided on the first support plate 41 . The first support plate 41 and the base portion 311 are clamped together via the clamping portion Y and the buckle X.

[0040] In some embodiments, the length of the second support plate 42 in the first direction gradually decreases as it approaches the first wall surface 1a, so that the second support plate 42 can be easily assembled between the two extensions 312, and the extensions 312 are not easily damaged during the assembly process.

[0041] In some embodiments, the extension portion 312 and the second support plate 42 are not provided, and the maximum length of the support member 4 is located at the first support plate 41 . After the support member 4 is assembled in the tab accommodating cavity 32 , the first support plate 41 presses the two base portions 311 .

[0042] In some embodiments, at least a portion of the second support plate 42 extends from the first support plate 41 toward the first wall 1a, so that a portion of the second support plate 42 is located on the side of the first support plate 41 close to the first wall 1a. In this way, the pole ear can be limited to prevent the pole ear from being torn off.

[0043] In some embodiments, the bracket 3 also includes a bottom plate 33, which is located between the two branches 31. The bottom plate 33 is provided with a through hole, and the pole at least partially passes through the through hole, and the bottom plate 33 is fixed to the first wall 1a. The bottom plate 33 can serve as an insulator between the pole and the shell 1.

[0044] In some embodiments, the bracket 3 further includes a flexible connection portion 34, and the flexible connection portion 34 is connected between the first support plate 41 and the bottom plate 33. With the flexible deformation of the flexible connection portion 34, the first support plate 41 can be flipped relative to the bracket 3. Before connecting the pole lug and the pole, the first support plate 41 is flipped outside the two base portions 311, and after the pole lug and the pole are connected, the first support plate 41 is flipped between the two base portions 311.

[0045] In some embodiments, the support member 4 and the bracket 3 are an integral structure, and can be specifically formed by integral injection molding. The integral injection molding structure has better integrity and lower molding cost. In the illustrated embodiment, one side of the first support plate 41 of the support member 4 is an integral structure with the flexible connecting portion 34 of the bracket 3, and when the first support plate 41 is flipped between the two branches 31, it is clamped with the two branches 31.

[0046] In some embodiments, the support member 4 and the bracket 3 are separate structures, and the support member 4 and the bracket 3 are assembled and fixed. The assembly method is not limited, for example, threaded fastener assembly, clamping assembly, adhesive assembly, or hot melt assembly can be used.

[0047] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A battery, characterized in that: The battery comprises a shell (1), a battery cell (2), a bracket (3) and a support member (4); the battery cell (2), the bracket (3) and the support member (4) are all located in the shell (1); the battery cell (2) comprises a battery cell body (21) and a pole ear; the bracket (3) is located on a side of the battery cell (2) where the pole ear is provided; the shell (1) has a first wall surface (1a); the bracket (3) comprises two branches (31); one end of the two branches (31) is fixed to the first wall surface (1a); the other end extends in a direction away from the first wall surface (1a); In a first direction, the two branches (31) are arranged at intervals and form a tab accommodating cavity (32) therebetween; the tab extends from the cell body (21) into the tab accommodating cavity (32); the support member (4) is used to be installed in the tab accommodating cavity (32); in the first direction, the maximum length of the support member (4) is L1, and the spacing between the two branches (31) is L2, L1>L2, so that after the support member (4) is installed in the tab accommodating cavity (32), the two sides of the support member (4) respectively press against the two branches (31), 30.5mm≤L1≤205mm; 30mm≤L2≤200mm.

2. The battery according to claim 1, characterized in that 1<L1 / L2≤1.

05.

3. The battery according to claim 1, characterized in that In the first direction, the length of the battery cell (2) is L, the length of the bracket (3) is L3, 0.9≤L3 / L≤1, 1≤L1 / L2≤1.

02.

4. The battery according to claim 1, characterized in that The ratio of the weight of the battery core (2) to the thickness of the first wall surface (1a) is C, 4kg / mm≤C≤6kg / mm, 1≤L1 / L2≤1.

02.

5. The battery according to claim 1, characterized in that The ratio of the weight of the battery core (2) to the thickness of the first wall surface (1a) is C, 6kg / mm≤C≤10kg / mm, 1.02≤L1 / L2≤1.

05.

6. The battery according to claim 1, characterized in that The shell (1) further comprises a second wall surface (1b), the first wall surface (1a) and the second wall surface (1b) are parallel to each other, the first wall surface (1a) and the second wall surface (1b) are arranged in sequence and spaced apart in a second direction, the second direction is perpendicular to the first direction, and in the second direction, the ratio of the height of the branch (31) to the distance between the first wall surface (1a) and the second wall surface (1b) corresponding to the branch (31) is D, 0.7≤D≤1, 1≤L1 / L2≤1.

015.

7. The battery according to claim 1, characterized in that The wall thickness of the shell is H, 0.2mm≤H≤0.4mm, 1.005≤L1 / L2≤1.

035.

8. The battery according to any one of claims 1 to 7, characterized in that: The branch portion (31) comprises a base portion (311), one side of the base portion (311) is supported on the first wall surface (1a), the support member (4) comprises a first support plate (41), the first support plate (41) is located between the two base portions (311), and the pole lug in the pole lug accommodating cavity (32) is located between the first support plate (41) and the first wall surface (1a).

9. The battery according to claim 8, characterized in that The branch portion (31) comprises an extension portion (312), wherein the extension portion (312) extends from the base portion (311) in a direction away from the first wall surface (1a), and the support member (4) comprises a second support plate (42), wherein at least a portion of the second support plate (42) extends from the first support plate (41) in a direction away from the first wall surface (1a), and the second support plate (42) is located between the two extension portions (312).

10. The battery according to claim 9, characterized in that A portion of the second support plate (42) extends from the first support plate (41) in a direction close to the first wall surface (1a).

11. The battery according to any one of claims 1 to 7, characterized in that: The bracket (3) and the support member (4) are an integral structure; or, the bracket (3) and the support member (4) are separate structures and are connected to each other.

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