Battery, method of assembling battery, and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery, a battery assembling method and a battery pack. The battery comprises a battery shell, a battery cell arranged in the battery shell, a battery cell main body, a first tab and a second tab, the first tab and the second tab extending from opposite ends of the battery cell main body to be connected to opposite sides of the battery shell, a first connecting piece, and the first connecting piece comprising a first section, a second section and a third section, the two ends of the first section being connected to the second section and the third section respectively, and the second section and the third section being connected to the second tab and the battery shell respectively. The first section is located between the second section and the third section, the second section is bent on a first side of the first section, the third section is bent on a second side of the first section, and the first side and the second side are located on opposite sides of the first section. The second tab and the first connecting piece are connected conveniently, and the battery is assembled conveniently, so that the assembling efficiency of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery, a battery assembly method, and a battery pack. Background Technology

[0002] In related technologies, when two tabs are side-mounted, one tab is welded to a cover plate pole. In order to weld the other tab to another cover plate pole, the tab needs to be made relatively long. However, if the tab is made too long, it is easy to produce wrinkles, which reduces the yield of the electrode manufacturing. Summary of the Invention

[0003] This invention provides a battery, a battery assembly method, and a battery pack to improve battery performance.

[0004] According to a first aspect of the present invention, a battery is provided, comprising:

[0005] Battery casing;

[0006] The battery cell is disposed inside the battery casing. The battery cell includes a battery cell body, a first electrode, and a second electrode. The first electrode and the second electrode extend from opposite ends of the battery cell body to connect to opposite sides of the battery casing, respectively.

[0007] The first connecting piece includes a first segment, a second segment, and a third segment. The two ends of the first segment are connected to the second segment and the third segment, respectively. The second segment and the third segment are connected to the second tab and the battery casing, respectively. When the third segment is stretched along a direction parallel to the lead-out direction of the second tab, at least a portion of the third segment is located on the outside of the battery casing.

[0008] The first segment is located between the second and third segments. The second segment bends on the first side of the first segment, and the third segment bends on the second side of the first segment. The first and second sides are located on opposite sides of the first segment.

[0009] The battery of this invention includes a battery casing, a battery cell, and a first connecting piece. The battery cell is disposed within the battery casing. A first tab and a second tab extend from opposite ends of the battery cell body, respectively, and can be connected to opposite sides of the battery casing. The second tab is connected to the battery casing via the first connecting piece, which not only facilitates the formation of an electrical connection between the second tab and the battery casing but also ensures the stability of the electrical connection. Furthermore, by bending the first connecting piece into a first segment, a second segment, and a third segment, the connection between the second tab and the first connecting piece is facilitated, as well as battery assembly, thereby improving battery assembly efficiency.

[0010] According to a second aspect of the present invention, a method for assembling a battery is provided, comprising:

[0011] Connect the first tab of the battery cell to the first cover plate assembly;

[0012] Using the second tab of the battery cell as the insertion end, the battery cell is inserted into the housing from the first port of the housing, and the first cover plate assembly blocks the first port. The first connecting piece connected to the second tab is exposed at the second port of the housing, and the first port and the second port are arranged opposite to each other.

[0013] Connect the first connecting piece to the second cover plate assembly;

[0014] The second cover plate assembly is sealed at the second port to bend the first connecting piece.

[0015] The battery assembly method of this invention connects the first tab of the battery cell to the first cover plate assembly, and installs the second tab of the battery cell as an insertion end inside the housing component. The first connecting piece connected to the second tab is exposed at the second port of the housing component, which facilitates the connection between the first connecting piece and the second cover plate assembly. The first connecting piece is bent during the process of sealing the second cover plate assembly at the second port, which facilitates the connection between the second tab and the first connecting piece and also facilitates the assembly of the battery, thereby improving the battery assembly efficiency.

[0016] According to a third aspect of the present invention, a battery pack is provided, comprising the battery described above.

[0017] The battery pack of this invention includes a battery, which comprises a battery casing, a battery cell, and a first connecting piece. The battery cell is disposed within the battery casing. A first tab and a second tab extend from opposite ends of the battery cell body, respectively, and can be connected to opposite sides of the battery casing. The second tab is connected to the battery casing via the first connecting piece, which not only facilitates the electrical connection between the second tab and the battery casing but also ensures the stability of the electrical connection. Furthermore, by bending the first connecting piece into a first segment, a second segment, and a third segment, the connection between the second tab and the first connecting piece is facilitated, as well as the assembly of the battery, thereby improving the assembly efficiency of the battery. Attached Figure Description

[0018] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0019] Figure 1 This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0020] Figure 2 This is an exploded structural diagram of a battery according to an exemplary embodiment;

[0021] Figure 3 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0022] Figure 4 This is a partial structural schematic diagram of a battery from a first perspective, according to an exemplary embodiment.

[0023] Figure 5 This is a partial structural schematic diagram of a battery from a second perspective, according to an exemplary embodiment.

[0024] Figure 6 This is a partial structural schematic diagram of a battery from a third perspective, according to an exemplary embodiment.

[0025] Figure 7 This is a schematic diagram of a partial structure of a battery according to another exemplary embodiment;

[0026] Figure 8 This is a schematic diagram of another partial structure of a battery according to another exemplary embodiment;

[0027] Figure 9 This is a schematic diagram of the structure of a first connecting piece of a battery according to an exemplary embodiment;

[0028] Figure 10 This is a schematic diagram of the structure of a first connecting piece of a battery according to another exemplary embodiment;

[0029] Figure 11 This is a schematic diagram of a battery installation state structure according to another exemplary embodiment;

[0030] Figure 12 This is a partial structural schematic diagram of a battery pack according to an exemplary embodiment;

[0031] Figure 13 This is a schematic flowchart illustrating a battery assembly method according to an exemplary embodiment.

[0032] The annotations in the attached figures are explained as follows:

[0033] 1. Battery housing; 2. Battery module; 10. Battery casing; 11. Casing component; 111. First port; 112. Second port; 12. First cover plate assembly; 121. First cover plate; 122. First terminal post; 13. Second cover plate assembly; 131. Second cover plate; 132. Second terminal post; 20. Battery cell; 21. Battery cell body; 22. First tab; 23. Second tab; 30. First connecting piece; 31. First section; 32. Second section; 321. First split component; 322. Second split component; 33. Third section; 40. Second connecting piece; 41. Fusible link; 50. Retainer; 60. Protective film. Detailed Implementation

[0034] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0035] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0036] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0038] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 11 The battery includes: a battery casing 10; a battery cell 20 disposed within the battery casing 10, the battery cell 20 including a battery cell body 21, a first tab 22, and a second tab 23, the first tab 22 and the second tab 23 extending from opposite ends of the battery cell body 21 to connect to opposite sides of the battery casing 10 respectively; and a first connecting piece 30 including a first segment 31, a second segment 32, and a third segment 33, the two ends of the first segment 31 being connected to the second segment 32 and the third segment 33 respectively. 3. The second segment 32 and the third segment 33 are respectively connected to the second tab 23 and the battery housing 10. When the third segment 33 is flattened along the direction parallel to the lead-out direction of the second tab 23, at least a portion of the third segment 33 is located on the outside of the battery housing 10. The first segment 31 is located between the second segment 32 and the third segment 33. The second segment 32 is bent and formed on the first side of the first segment 31, and the third segment 33 is bent and formed on the second side of the first segment 31. The first side and the second side are located on opposite sides of the first segment 31.

[0039] One embodiment of the battery of the present invention includes a battery casing 10, a battery cell 20, and a first connecting piece 30. The battery cell 20 is disposed inside the battery casing 10. A first tab 22 and a second tab 23 extend from opposite ends of the battery cell body 21, respectively, and can be connected to opposite sides of the battery casing 10. The second tab 23 is connected to the battery casing 10 through the first connecting piece 30, which not only facilitates the electrical connection between the second tab 23 and the battery casing 10, but also ensures the stability of the electrical connection between the second tab 23 and the battery casing 10. Furthermore, by bending the first connecting piece 30 into a first segment 31, a second segment 32, and a third segment 33, it not only facilitates the connection between the second tab 23 and the first connecting piece 30, but also facilitates battery assembly, thereby improving battery assembly efficiency.

[0040] It should be noted that since the second tab 23 is connected to the battery casing 10 through the first connecting piece 30, the structural form of the second tab 23 does not need to be considered excessively. For example, the length of the second tab 23 does not need to be excessively increased, and the connection between the second tab 23 and the first connecting piece 30 can be completed quickly, thereby increasing the total length of the second tab 23 and the first connecting piece 30. This facilitates the subsequent connection with the battery casing 10. After the connection is completed, the subsequent connection can also be formed by bending the first connecting piece 30.

[0041] The lead-out direction of the first electrode 22 can be considered as the lead-out direction of the first electrode 22 from the cell body 21. The first electrode 22 may include multiple individual electrodes, which can be formed by bending and folding together. When each individual electrode is flattened, the extension direction of the individual electrode can be considered as the lead-out direction of the first electrode 22. Similarly, the lead-out direction of the second electrode 23 can be considered as the lead-out direction of the second electrode 23 from the cell body 21. The second electrode 23 may include multiple individual electrodes, which can be formed by bending and folding together. When each individual electrode is flattened, the extension direction of the individual electrode can be considered as the lead-out direction of the second electrode 23.

[0042] When the third segment 33 is stretched out parallel to the lead-out direction of the second tab 23, at least a portion of the third segment 33 is located outside the battery housing 10, meaning the third segment 33 can extend beyond the second port 112 of the housing component 11. This facilitates the connection between the second cover assembly 13 and the third segment 33. After the connection between the second cover assembly 13 and the third segment 33 is completed, the third segment 33 and the first segment 31 can be bent. When the third segment 33 is stretched out parallel to the lead-out direction of the second tab 23, at least a portion of the third segment 33 is located outside the battery housing 10. This avoids excessively increasing the length of the second tab 23; instead, the length is increased through the first connecting piece 30, facilitating the subsequent connection of the third segment 33 to the battery housing 10.

[0043] When the first segment 31 is stretched along the direction parallel to the lead-out direction of the second tab 23, at least a portion of the first segment 31 is located on the outside of the battery casing 10, that is, the first segment 31 can be relatively long, so that the third segment 33 can be easily connected to the second cover assembly 13. The length of the third segment 33 can also be shorter than that of the first segment 31, so as to avoid the third segment 33 occupying too much space.

[0044] A battery consists of a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged.

[0045] In one embodiment, such as Figure 1 and Figure 2As shown, the battery housing 10 includes: a housing component 11, which includes a first port 111 and a second port 112 disposed opposite to each other; a first cover plate assembly 12, which is connected to the first port 111; and a second cover plate assembly 13, which is connected to the second port 112. A first tab 22 and a second tab 23 are respectively connected to the first cover plate assembly 12 and the second cover plate assembly 13. The second tab 23 is connected to the second cover plate assembly 13 via a first connecting piece 30. Therefore, after the connection of the second tab 23, the first connecting piece 30, and the second cover plate assembly 13 is completed, the first connecting piece 30 can be bent during the process of connecting the second cover plate assembly 13 to the housing component 11, thereby improving the battery installation efficiency.

[0046] The first tab 22 of the battery cell 20 can be connected to the first cover plate assembly 12 firstly, that is, the first tab 22 and the first cover plate assembly 12 form an electrical connection. The second tab 23 of the battery cell 20 is then used as an insertion end. The battery cell 20 is inserted into the housing 11 through the first port 111, and the first cover plate assembly 12 seals the first port 111. At this time, the first connecting piece 30 connected to the second tab 23 is exposed at the second port 112 of the housing 11, thus facilitating the connection between the first connecting piece 30 and the first cover plate assembly 12. The two cover plate assemblies 13 are connected, and after the first connecting piece 30 is connected to the second cover plate assembly 13, the second cover plate assembly 13 can be sealed at the second port 112. During this process, the first connecting piece 30 is bent, so that the first connecting piece 30 is bent into a first segment 31, a second segment 32 and a third segment 33. The first segment 31 is located between the second segment 32 and the third segment 33. The second segment 32 is bent and formed on the first side of the first segment 31, and the third segment 33 is bent and formed on the second side of the first segment 31.

[0047] It should be noted that the first side and the second side are located on opposite sides of the first segment 31. The opposite sides of the first segment 31 do not include the opposite ends connecting the first segment 31 to the second segment 32 and the third segment 33, but specifically refer to the two opposite large surfaces of the first segment 31. Figure 9 As shown, these can be considered as the upper and lower sides of the first segment 31. This design makes it easier for the first connecting piece 30 to be bent and shaped, and to be placed inside the battery housing 10 without taking up too much space inside the battery.

[0048] It should be noted that the first paragraph 31 can be a single paragraph; for example, the first paragraph 31 can be a flat paragraph, such as... Figure 9 As shown. Alternatively, the first segment 31 may include multiple segments; for example, the first segment 31 may be a U-shaped structure, such as... Figure 10 The first paragraph 31 can also be an S-shaped structure, which is not limited here.

[0049] In one embodiment, such as Figure 2As shown, the first cover plate assembly 12 includes a first cover plate 121 and a first terminal post 122. The first terminal post 122 is disposed on the first cover plate 121, and the first electrode tab 22 is connected to the first terminal post 122. The second cover plate assembly 13 includes a second cover plate 131 and a second terminal post 132. The second terminal post 132 is disposed on the second cover plate 131, and the second electrode tab 23 is connected to the second terminal post 132. Thus, the first terminal post 122 and the second terminal post 132 can serve as the two electrode leads of the battery, facilitating the charging and discharging of the battery.

[0050] The first pole post 122 and the first cover plate 121 are insulated from each other, and the second pole post 132 and the second cover plate 131 are insulated from each other.

[0051] In some embodiments, the first tab 22 can be directly connected to the first pole post 122, and the first tab 22 and the first pole post 122 can be welded.

[0052] In some embodiments, the battery further includes a second connecting piece 40, through which the first electrode tab 22 is connected to the first cover plate assembly 12, thereby facilitating the connection between the first electrode tab 22 and the first cover plate assembly 12 and adapting to the installation position requirements of the first electrode tab 22 and the first cover plate assembly 12. The first electrode tab 22 is connected to the first terminal post 122 of the first cover plate assembly 12 via the second connecting piece 40, such as... Figure 5 As shown.

[0053] In some embodiments, the first cover plate assembly 12 may omit the first terminal post 122, and the first tab 22 may be electrically connected to the first cover plate 121, while the second cover plate assembly 13 may include the second terminal post 132, and the second tab 23 may be electrically connected to the second terminal post 132. Alternatively, the first cover plate assembly 12 may omit the first terminal post 122, the second cover plate assembly 13 may omit the second terminal post 132, the first tab 22 may be electrically connected to the first cover plate 121, and the second tab 23 may be electrically connected to the second cover plate 131. In this case, the first cover plate assembly 12 and the housing member 11 may be insulated from each other, and the second cover plate assembly 13 and the housing member 11 may be insulated from each other. Or, the first cover plate assembly 12 may include the first terminal post 122, and the second cover plate assembly 13 may omit the second terminal post 132.

[0054] In one embodiment, the large surface of the second segment 32 is arranged opposite to the first segment 31, and the large surface of the third segment 33 is arranged opposite to the first segment 31, thereby avoiding the first connecting piece 30 from occupying a large space inside the battery, thus making reasonable arrangements for the first connecting piece 30.

[0055] In one embodiment, the large surface of the second segment 32 is slightly parallel to the large surface of the third segment 33, thereby making the height of the first connecting piece 30 relatively small, thus reducing the internal battery space occupied by the first connecting piece 30.

[0056] It should be noted that the large surface of the second segment 32 is the surface with the largest area of ​​the second segment 32, and both the upper and lower surfaces of the second segment 32 are also large surfaces of the second segment 32. Similarly, the large surface of the third segment 33 is the surface with the largest area of ​​the third segment 33, and both the upper and lower surfaces of the third segment 33 are also large surfaces of the third segment 33. The two opposite surfaces of the first segment 31 are the two large surfaces of the first segment 31. Therefore, the large surface of the second segment 32 can be slightly parallel to one of the large surfaces of the first segment 31, and the large surface of the third segment 33 can be slightly parallel to the other large surface of the first segment 31. This slight parallelism refers to the fact that manufacturing and installation precision are ignored; the large surface of the second segment 32 is parallel to the large surface of the third segment 33.

[0057] In one embodiment, at least a portion of the second segment 32 is integrally formed with the first segment 31, which not only simplifies the structure but also ensures the structural strength of the first segment 31 and the second segment 32.

[0058] At least a portion of the third segment 33 is integrally formed with the first segment 31, which not only simplifies the structure but also ensures the structural strength of the third segment 33 and the first segment 31.

[0059] In one embodiment, such as Figure 6 As shown, the large surface of the second tab 23 is disposed opposite to the end of the cell body 21, and at least a portion of the second segment 32 is connected to the large surface of the second tab 23 facing the end of the cell body 21, thereby avoiding damage to the cell body 21 during the connection of the second tab 23 and the second segment 32.

[0060] The second tab 23 and the second segment 32 can be welded together. For example, the second tab 23 and the second segment 32 can be laser welded together. Since the second segment 32 is located inside the second tab 23, the laser can be prevented from penetrating into the battery and damaging the cell body 21.

[0061] It should be noted that the first tab 22 and the second tab 23 extend from opposite ends of the cell body 21. The lead-out direction of the first tab 22 and the second tab 23 is perpendicular to the end of the cell body 21. The second tab 23 needs to be folded and bent so that the large surface of the second tab 23 is positioned opposite to the end of the cell body 21. The second segment 32 is inserted inside the second tab 23 to prevent the laser from penetrating into the battery and damaging the cell body 21.

[0062] In one embodiment, such as Figure 3 and Figure 4As shown, the battery also includes a retainer 50 and a protective film 60. The retainer 50 is disposed at one end of the cell body 21 having a second tab 23. The protective film 60 covers the cell body 21 and is fixedly connected to the retainer 50. For example, the protective film 60 is welded to the retainer 50, so that the retainer 50 can be stably disposed in the housing 11 and the cell body 21 can be stably installed in the housing 11.

[0063] The retainer 50 can be an insulating structure, and the protective film 60 can be a Mylar film. After the second tab 23 is welded to the first connecting piece 30, the retainer 50 is welded to one end of the cell body 21 with the second tab 23. The retainer 50 is welded and fixed to the Mylar film. Subsequently, the end of the cell body 21 connected to the retainer 50 can be inserted into the housing 11.

[0064] It should be noted that a retainer may also be provided on the side of the battery cell body 21 with the first tab 22; this is not a limitation.

[0065] In one embodiment, such as Figure 5 As shown, the second connecting piece 40 has a fusible portion 41, so that after the current reaches a certain value, the second connecting piece 40 can be disconnected at the location of the fusible portion 41, thereby breaking the electrical connection between the first electrode tab 22 and the first cover plate assembly 12. The fusible portion 41 can be a through hole.

[0066] In one embodiment, the first electrode 22 is the positive electrode, the second electrode 23 is the negative electrode, the positive electrode is connected to the first cover plate assembly 12 via the second connecting piece 40, and the negative electrode is connected to the second cover plate assembly 13 via the first connecting piece 30.

[0067] In one embodiment, combined Figure 5 and Figure 6 As shown, the battery cell 20 may include a first battery cell and a second battery cell, which are arranged side by side. One tab of the first battery cell and one tab of the second battery cell form a first tab 22, and the other tab of the first battery cell and the other tab of the second battery cell form a second tab 23. The second segment 32 is an integrally molded structure, and the second segment 32 connects both the tabs of the first battery cell and the tabs of the second battery cell. The combination of the first battery cell and the second battery cell to form the battery cell 20 not only simplifies the manufacturing process (forming a thicker battery cell is more difficult to process), but also ensures that the battery cell 20 has sufficient energy density to meet usage requirements. Furthermore, the integrally molded second segment 32, which connects both the tabs of the first battery cell and the tabs of the second battery cell, simplifies the structure of the first connecting piece 30.

[0068] like Figure 9As shown, the first connecting piece 30 can be a one-piece molded structure, that is, the first segment 31, the second segment 32 and the third segment 33 are one-piece molded structures, which not only has a simple structure, but also can ensure structural strength.

[0069] The tabs of the first battery cell and the second battery cell can be simultaneously welded to the second connecting piece 40. The tabs of the first battery cell and the second battery cell can be connected to the second connecting piece 40 by butterfly welding. Then the first battery cell and the second battery cell can be combined to form battery cell 20. Subsequently, the battery cell 20 is installed into the housing 11, and the tabs of the first battery cell and the second battery cell can be simultaneously welded to the second segment 32.

[0070] In one embodiment, such as Figure 7 and Figure 8 As shown, the battery cell 20 may include a first battery cell and a second battery cell, which are arranged side by side. One tab of the first battery cell and one tab of the second battery cell form a first tab 22, and the other tab of the first battery cell and the other tab of the second battery cell form a second tab 23. The second segment 32 includes a first split component 321 and a second split component 322 connected to each other. The first split component 321 and the second split component 322 are separately arranged. The first split component 321 is connected to the tab of the first battery cell, and the second split component 322 is connected to the tab of the second battery cell. The first segment 31 connects to the first split component 321. The first split component 321 and the second split component 322 can be independently soldered to the tabs of the first battery cell and the tab of the second battery cell, thereby reducing the soldering difficulty, improving the assembly efficiency, and simplifying the auxiliary structures required in the soldering process.

[0071] The first split component 321 can be welded to the tab of the first battery cell, and the second split component 322 can be welded to the tab of the second battery cell. By welding the first split component 321 and the second split component 322, the connection between the second tab 23 and the first connecting piece 30 is realized. Subsequently, the third segment 33 of the first connecting piece 30 can be connected to the second cover plate assembly 13, and the first connecting piece 30 can be bent during the connection of the second cover plate assembly 13 and the housing component 11.

[0072] Combination Figure 10 As shown, the first split component 321 is roughly L-shaped, the second split component 322 is roughly L-shaped, and the first split component 321, the first segment 31 and the third segment 33 are integrally formed.

[0073] It should be noted that the battery cell 20 may include a first battery cell and a second battery cell, which are arranged side by side. The first battery cell and the second battery cell may be battery cells with the same structure, or they may be battery cells with different structures; no limitation is made here. The structure of the first battery cell and the second battery cell is also not limited.

[0074] An embodiment of the present invention also provides a battery assembly method, please refer to... Figure 13 The battery assembly method includes:

[0075] S101, connect the first tab 22 of the battery cell 20 to the first cover plate assembly 12;

[0076] S103, using the second tab 23 of the battery cell 20 as the insertion end, the battery cell 20 is inserted into the housing 11 through the first port 111 of the housing 11, and the first cover plate assembly 12 blocks the first port 111. The first connecting piece 30 connected to the second tab 23 is exposed at the second port 112 of the housing 11, and the first port 111 and the second port 112 are arranged opposite to each other.

[0077] S105, connect the first connecting piece 30 to the second cover plate assembly 13;

[0078] S107, the second cover plate assembly 13 is sealed at the second port 112 to bend the first connecting piece 30.

[0079] In one embodiment of the present invention, the battery assembly method connects the first tab 22 of the cell 20 to the first cover plate assembly 12, and installs the second tab 23 of the cell 20 as an insertion end inside the housing 11. The first connecting piece 30 connected to the second tab 23 is exposed at the second port 112 of the housing 11, thereby facilitating the connection between the first connecting piece 30 and the second cover plate assembly 13. The first connecting piece 30 is bent during the process of sealing the second cover plate assembly 13 at the second port 112, thereby facilitating the connection between the second tab 23 and the first connecting piece 30 and also facilitating the assembly of the battery, thereby improving the battery assembly efficiency.

[0080] It should be noted that, in combination Figure 11 As shown, the second tab 23 of the battery cell 20 is used as the insertion end. The second tab 23 of the battery cell 20 is inserted into the housing 11 through the first port 111, and the first connecting piece 30 connected to the second tab 23 is exposed at the second port 112 of the housing 11, so as to facilitate the subsequent connection of the first connecting piece 30 to the second cover plate assembly 13. At this time, the length of the second tab 23 does not need to be too long, so as to avoid problems such as wrinkles.

[0081] During the process of the second cover plate assembly 13 sealing the second port 112, the first connecting piece 30 exposed at the second port 112 of the housing part 11 is bent, thereby ensuring that the second cover plate assembly 13 and the housing part 11 form a sealed connection. The entire assembly process can facilitate the connection between the first connecting piece 30 and the second cover plate assembly 13, and will not affect the connection between the second cover plate assembly 13 and the housing part 11.

[0082] In one embodiment, the battery assembly method further includes: before inserting the battery cell 20 into the housing 11 through the first port 111, connecting the second tab 23 to the first connecting piece 30, thereby preventing the housing 11 from affecting the connection between the second tab 23 and the first connecting piece 30, thereby improving the connection efficiency between the second tab 23 and the first connecting piece 30.

[0083] The second tab 23 and the first connecting piece 30 can be welded. Welding the second tab 23 and the first connecting piece 30 before inserting the cell 20 into the housing 11 through the first port 111 of the housing 11 facilitates the welding of the second tab 23 and the first connecting piece 30, thereby improving the battery assembly efficiency. Furthermore, the length of the second tab 23 can be relatively small, since the first connecting piece 30 increases the subsequent connection length with the second cover plate assembly 13, thus facilitating the connection between the first connecting piece 30 and the second cover plate assembly 13.

[0084] It should be noted that the first tab 22 of the battery cell 20 can be connected to the first cover plate assembly 12 firstly, that is, the first tab 22 and the first cover plate assembly 12 form an electrical connection. The second tab 23 of the battery cell 20 is then used as the insertion end. The battery cell 20 is inserted into the housing 11 through the first port 111, and the first cover plate assembly 12 seals the first port 111. At this time, the first connecting piece 30 connected to the second tab 23 is exposed at the second port 112 of the housing 11, thus facilitating the connection of the first connecting piece 30. The first connecting piece 30 is connected to the second cover plate assembly 13, and after the connection between the first connecting piece 30 and the second cover plate assembly 13 is completed, the second cover plate assembly 13 can be sealed at the second port 112. During this process, the first connecting piece 30 is bent, so that the first connecting piece 30 is bent into a first segment 31, a second segment 32 and a third segment 33, and the first segment 31 is located between the second segment 32 and the third segment 33. The second segment 32 is bent and formed on the first side of the first segment 31, and the third segment 33 is bent and formed on the second side of the first segment 31.

[0085] In one embodiment, connecting the second tab 23 to the first connecting piece 30 includes: bending the second tab 23 so that the large surface of the second tab 23 is disposed opposite to the end of the cell body 21; disposing the first connecting piece 30 on the large surface of the second tab 23 facing the end of the cell body 21; welding the first connecting piece 30 and the second tab 23, such that a portion of the first connecting piece 30 is exposed on the outside of the second tab 23, thereby facilitating the subsequent connection of the first connecting piece 30 to the second cover plate assembly 13. The first connecting piece 30 being disposed on the large surface of the second tab 23 facing the end of the cell body 21 can prevent damage to the cell body 21 during the welding process of the second tab 23 and the first connecting piece 30.

[0086] In one embodiment, the first connecting piece 30 exposed on the outside of the second electrode 23 is bent so that the first connecting piece 30 is disposed opposite to the second electrode 23, thereby facilitating the subsequent connection of the first connecting piece 30 to the second cover plate assembly 13.

[0087] Before the second tab 23 is inserted into the housing 11, the first connecting piece 30 is already connected to the second tab 23. Therefore, during the insertion of the first connecting piece 30 into the housing 11, it is only necessary to avoid interference between the first connecting piece 30 and the housing 11. After the first connecting piece 30 is exposed at the second port 112, it is convenient to connect the first connecting piece 30 to the second cover plate assembly 13. The first connecting piece 30, which is bent to expose the outside of the second tab 23, and arranged so that the first connecting piece 30 is opposite to the second tab 23, can be done before or after the first connecting piece 30 is inserted into the housing 11. There is no limitation here, as long as it is ensured that the first connecting piece 30 does not interfere with the housing 11 and that the subsequent connection of the first connecting piece 30 to the second cover plate assembly 13 is convenient.

[0088] In one embodiment, before connecting the first connecting piece 30 to the second cover plate assembly 13, the first connecting piece 30 exposed on the outside of the second electrode 23 is bent so that the first connecting piece 30 and the second electrode 23 are disposed opposite each other; wherein, the first connecting piece 30 has at least two creases, thereby facilitating the subsequent connection of the first connecting piece 30 to the second cover plate assembly 13.

[0089] In one embodiment, during the process of sealing the second cover plate assembly 13 at the second port 112, the first connecting piece 30 is bent along the crease of the first connecting piece 30, which facilitates the bending of the first connecting piece 30 and ensures that the first connecting piece 30 has a high-precision bending position.

[0090] Since the first connecting piece 30 has at least two creases before it is connected to the second cover plate assembly 13, the first connecting piece 30 can be easily bent during the subsequent connection process between the second cover plate assembly 13 and the housing part 11, and the first connecting piece 30 can be guaranteed to have a high-precision bending position.

[0091] In one embodiment, connecting the first connecting piece 30 to the second cover plate assembly 13 includes: making the second cover plate assembly 13 form a certain angle with the plane containing the second port 112; and welding the first connecting piece 30 to the second cover plate assembly 13. When welding the first connecting piece 30 to the second cover plate assembly 13, a certain distance should be left between the welding head and the welding point, and the second cover plate assembly 13 forming a certain angle with the plane containing the second port 112 can provide a reliable welding gap, thereby facilitating the connection between the first connecting piece 30 and the second cover plate assembly 13, and also allowing the first connecting piece 30 to be less long, facilitating subsequent bending of the first connecting piece 30.

[0092] In one embodiment, combined Figure 11 As shown, the second cover plate assembly 13 is substantially perpendicular to the plane where the second port is located, thereby providing sufficient welding space for the subsequent welding of the first connecting piece 30 and the second cover plate assembly 13, facilitating the welding of the first connecting piece 30 and the second cover plate assembly 13, making it easier for the welding fixture to clamp the second cover plate assembly 13, reducing the risk of welding residue falling into the battery, and making it easier to bend the first connecting piece 30 later.

[0093] Before connecting the first connecting piece 30 to the second cover plate assembly 13, a portion of the first connecting piece 30 is positioned opposite the second tab 23, and a portion of the first connecting piece 30 can be substantially perpendicular to the plane where the second port 112 is located. After the second cover plate assembly 13 is substantially perpendicular to the plane where the second port 112 is located, a portion of the first connecting piece 30 can be reliably fitted to the second cover plate assembly 13, thereby facilitating subsequent welding. After welding is completed, the first connecting piece 30 can be bent according to the crease position.

[0094] In one embodiment, connecting the first tab 22 of the battery cell 20 to the first cover plate assembly 12 includes: connecting a second connecting piece 40 to the first cover plate assembly 12; and connecting the second connecting piece 40 to the first tab 22. Connecting the first tab 22 to the first cover plate assembly 12 via the second connecting piece 40 not only ensures the current-carrying capacity between the first tab 22 and the first cover plate assembly 12, but also improves the connection strength.

[0095] The first electrode tab 22 can be connected to the first electrode post 122 of the first cover plate assembly 12 via the second connecting piece 40, and the second electrode tab 23 can be connected to the second electrode post 132 of the second cover plate assembly 13 via the first connecting piece 30.

[0096] In some embodiments, it is not excluded that the first tab 22 and the first cover plate assembly 12 can be directly connected.

[0097] In one embodiment, the second connecting piece 40 is formed with a fusible portion 41, so that after the current reaches a certain value, the second connecting piece 40 can be disconnected at the location of the fusible portion 41, thereby disconnecting the electrical connection between the second tab 23 and the second cover plate assembly 13.

[0098] Considering that the second connecting piece 40 has a fusion section 41 and the welding area of ​​the second connecting piece 40 is relatively small, it is difficult to weld. In this embodiment, by first welding the second connecting piece 40 with the fusion section 41 to the first electrode tab 22 and the first cover plate assembly 12, the second connecting piece 40 can be accurately welded into place.

[0099] In one implementation, the first electrode tab 22 is the positive electrode tab, and the second electrode tab 23 is the negative electrode tab. The positive electrode tab has a fusible part 41. Connecting the positive electrode tab first, followed by connecting the negative electrode tab, can ensure the reliability of the welding. It is not impossible for the first electrode tab 22 to be either the negative electrode tab or the positive electrode tab; this is not a limitation here.

[0100] In one embodiment, after the second tab 23 is connected to the first connecting piece 30, a retainer 50 is provided at one end of the cell body 21 with the second tab 23, and the protective film 60 covering the cell body 21 is fixedly connected to the retainer 50. Subsequently, the cell body 21 is inserted into the housing 11 from one end of the retainer 50.

[0101] In one embodiment, the battery cell 20 is formed by a first battery cell and a second battery cell. This not only simplifies the manufacturing process, as forming a thicker battery cell is more difficult, but also ensures that the battery cell 20 has sufficient energy density to meet usage requirements by having the first and second battery cells arranged side by side.

[0102] The first connecting piece 30 is an integrally formed structure. The first connecting piece 30 connects the tab of the first battery cell and the tab of the second battery cell at the same time, which can simplify the structure of the first connecting piece 30.

[0103] The first connecting piece 30 can be a one-piece molded structure, which is not only simple in structure but also ensures structural strength. The tabs of the first battery cell and the second battery cell can be simultaneously welded to the second connecting piece 40. The tabs of the first battery cell and the second battery cell can be connected to the second connecting piece 40 by butterfly welding. Then, the first battery cell and the second battery cell can be combined to form battery cell 20. Subsequently, the battery cell 20 is installed into the housing 11, and the tabs of the first battery cell and the second battery cell can be simultaneously welded to the first connecting piece 30.

[0104] The first connecting piece 30 includes two separately configured first split parts 321 and second split parts 322. The first split part 321 is connected to the tab of the first battery cell, and the second split part 322 is connected to the tab of the second battery cell, thus connecting the first split part 321 and the second split part 322.

[0105] The first component 321 and the second component 322 can be independently welded to the tabs of the first battery cell and the tabs of the second battery cell, thereby reducing the welding difficulty, improving the assembly efficiency, and simplifying the auxiliary structures required in the welding process.

[0106] The tabs of the first and second battery cells can be simultaneously welded to the second connecting piece 40. The tabs of the first and second battery cells can be connected to the second connecting piece 40 by butterfly welding. Then, the first and second battery cells can be combined to form a battery cell 20. The first split component 321 can be welded to the tab of the first battery cell, and the second split component 322 can be welded to the tab of the second battery cell. Then, the first split component 321 and the second split component 322 are welded together, thereby realizing the connection between the second tab 23 and the first connecting piece 30. Subsequently, the first connecting piece 30 can be connected to the second cover plate assembly 13, and the first connecting piece 30 can be bent during the subsequent connection of the second cover plate assembly 13 and the housing component 11.

[0107] An embodiment of the present invention also provides a battery pack including the battery described above.

[0108] A battery pack according to one embodiment of the present invention includes a battery, which includes a battery casing 10, a battery cell 20, and a first connecting piece 30. The battery cell 20 is disposed inside the battery casing 10. A first tab 22 and a second tab 23 extend from opposite ends of the battery cell body 21, respectively, and can be connected to opposite sides of the battery casing 10. The second tab 23 is connected to the battery casing 10 through the first connecting piece 30, which not only facilitates the electrical connection between the second tab 23 and the battery casing 10, but also ensures the stability of the electrical connection between the second tab 23 and the battery casing 10. Furthermore, by bending the first connecting piece 30 into a first segment 31, a second segment 32, and a third segment 33, it not only facilitates the connection between the second tab 23 and the first connecting piece 30, but also facilitates battery assembly, thereby improving battery assembly efficiency.

[0109] In one embodiment, the battery pack is a battery module or a battery pack.

[0110] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0111] like Figure 12 As shown, multiple batteries can be assembled into a battery module 2 and then placed inside the battery housing 1. The multiple batteries can be fixed using end plates and side plates. Alternatively, multiple batteries can be directly placed inside the battery housing, eliminating the need to group them together; in this case, the end plates and side plates can be removed.

[0112] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0113] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, include: The battery housing (10) includes a housing component (11) and a second cover assembly (13), the housing component (11) including a second port (112), and the second cover assembly (13) connected to the second port (112). The battery cell (20) is disposed inside the battery casing (10). The battery cell (20) includes a battery cell body (21), a first tab (22) and a second tab (23). The first tab (22) and the second tab (23) extend from opposite ends of the battery cell body (21) to connect to opposite sides of the battery casing (10) respectively. The first connecting piece (30) is made so that the second cover plate assembly (13) is substantially perpendicular to the plane where the second port (112) is located. The first connecting piece (30) and the second cover plate assembly (13) are welded together to connect the first connecting piece (30) and the second cover plate assembly (13). The second cover plate assembly (13) is sealed at the second port (112) to bend the first connecting piece (30). The first connecting piece (30) includes a first segment (31), a second segment (32) and a third segment (33). The two ends of the first segment (31) are respectively connected to the second segment (32) and the third segment (33). The second segment (32) and the third segment (33) are respectively connected to the second tab (23) and the battery housing (10). When the third segment (33) is stretched along a direction parallel to the lead-out direction of the second tab (23), at least a portion of the third segment (33) is located on the outside of the battery housing (10). Wherein, the first segment (31) is located between the second segment (32) and the third segment (33), the second segment (32) is bent and formed on the first side of the first segment (31), and the third segment (33) is bent and formed on the second side of the first segment (31), the first side and the second side are located on opposite sides of the first segment (31); The battery cell (20) further includes a first battery cell and a second battery cell. The first battery cell and the second battery cell are arranged side by side. One tab of the first battery cell and one tab of the second battery cell form the first tab (22). The other tab of the first battery cell and the other tab of the second battery cell form the second tab (23). The second segment (32) includes a first split component (321) and a second split component (322) connected to each other. The first split component (321) and the second split component (322) are separately arranged. The first split component (321) is connected to the tab of the first battery cell, and the second split component (322) is connected to the tab of the second battery cell. The first segment (31) is connected to the first split component (321). The first split component (321) and the second split component (322) are both L-shaped structures. The first split component (321), the first segment (31) and the third segment (33) are integrally formed structures.

2. The battery according to claim 1, characterized in that, The large surface of the second segment (32) is arranged opposite to the first segment (31), and the large surface of the third segment (33) is arranged opposite to the first segment (31).

3. The battery according to claim 2, characterized in that, The large surface of the second segment (32) is slightly parallel to the large surface of the third segment (33).

4. The battery according to claim 1, characterized in that, At least a portion of the second segment (32) is integrally formed with the first segment (31); At least a portion of the third segment (33) is integrally formed with the first segment (31).

5. The battery according to claim 1, characterized in that, The large surface of the second tab (23) is disposed opposite to the end of the cell body (21), and at least a portion of the second segment (32) is connected to the large surface of the second tab (23) facing the end of the cell body (21).

6. The battery according to claim 1, characterized in that, The housing component (11) further includes a first port (111) disposed opposite to the second port (112), and the battery housing (10) further includes: First cover plate assembly (12), the first cover plate assembly (12) is connected to the first port (111); The first electrode (22) and the second electrode (23) are respectively connected to the first cover plate assembly (12) and the second cover plate assembly (13).

7. The battery according to claim 6, characterized in that, The first cover plate assembly (12) includes a first cover plate (121) and a first pole post (122), the first pole post (122) is disposed on the first cover plate (121), and the first pole tab (22) is connected to the first pole post (122). The second cover plate assembly (13) includes a second cover plate (131) and a second pole post (132), the second pole post (132) is disposed on the second cover plate (131), and the second pole ear (23) is connected to the second pole post (132).

8. The battery according to claim 7, characterized in that, The battery also includes a second connecting piece (40), through which the first tab (22) is connected to the second cover plate assembly (13).

9. The battery according to any one of claims 1 to 8, characterized in that, When the first segment (31) is stretched along a direction parallel to the lead-out direction of the second tab (23), at least a portion of the first segment (31) is located on the outside of the battery casing (10).

10. The battery according to any one of claims 1 to 8, characterized in that, The battery cell (20) includes a first battery cell and a second battery cell, which are arranged side by side. One tab of the first battery cell and one tab of the second battery cell form the first tab (22), and the other tab of the first battery cell and the other tab of the second battery cell form the second tab (23). The second segment (32) is an integrally molded structure, and the second segment (32) connects the tab of the first battery cell and the tab of the second battery cell.

11. A method for assembling a battery, used for assembling the battery as described in claim 1, characterized in that, include: Connect the first tab (22) of the battery cell (20) to the first cover plate assembly (12); Using the second tab (23) of the battery cell (20) as the insertion end, the battery cell (20) is inserted into the housing (11) through the first port (111) of the housing (11), and the first cover plate assembly (12) blocks the first port (111). The first connecting piece (30) connected to the second tab (23) is exposed at the second port (112) of the housing (11), and the first port (111) and the second port (112) are arranged opposite to each other. The second cover plate assembly (13) and the plane containing the second port (112) form a certain angle, and the first connecting piece (30) and the second cover plate assembly (13) are welded together to connect the first connecting piece (30) and the second cover plate assembly (13); The second cover plate assembly (13) is sealed at the second port (112) to bend the first connecting piece (30).

12. The battery assembly method according to claim 11, characterized in that, Also includes: Before inserting the battery cell (20) into the housing (11) through the first port (111), Connect the second electrode (23) to the first connecting piece (30).

13. The battery assembly method according to claim 12, characterized in that, Connecting the second electrode tab (23) to the first connecting piece (30) includes: The second tab (23) is bent so that the large surface of the second tab (23) is positioned opposite to the end of the cell body (21); The first connecting piece (30) is disposed on the large surface of the second electrode (23) facing the end of the cell body (21); The first connecting piece (30) and the second electrode tab (23) are welded together, such that a portion of the first connecting piece (30) is exposed on the outside of the second electrode tab (23).

14. The battery assembly method according to claim 13, characterized in that, The first connecting piece (30) exposed on the outside of the second electrode (23) is bent so that the first connecting piece (30) is positioned opposite to the second electrode (23).

15. The battery assembly method according to claim 14, characterized in that, Before connecting the first connecting piece (30) to the second cover plate assembly (13), the first connecting piece (30) exposed on the outside of the second electrode (23) is bent so that the first connecting piece (30) and the second electrode (23) are positioned opposite each other; The first connecting piece (30) has at least two creases.

16. The battery assembly method according to claim 15, characterized in that, During the process of sealing the second cover plate assembly (13) at the second port (112), the first connecting piece (30) is bent along the crease of the first connecting piece (30).

17. The battery assembly method according to claim 11, characterized in that, This makes the second cover plate assembly (13) substantially perpendicular to the plane where the second port is located.

18. The method for assembling a battery according to any one of claims 11 to 16, characterized in that, Connecting the first tab (22) of the battery cell (20) to the first cover plate assembly (12) includes: The second connecting piece (40) is connected to the first cover plate assembly (12); Connect the second connecting piece (40) to the first electrode (22).

19. The battery assembly method according to claim 18, characterized in that, The second connecting piece (40) has a fusible portion (41).

20. The battery assembly method according to claim 19, characterized in that, The first electrode (22) is the positive electrode, and the second electrode (23) is the negative electrode.

21. The battery assembly method according to claim 11, characterized in that, The battery cell (20) is formed by a first battery cell and a second battery cell; The first connecting piece (30) is an integrally formed structure, and the first connecting piece (30) connects the tab of the first battery cell and the tab of the second battery cell at the same time. Alternatively, the first connecting piece (30) includes two separately configured first split parts (321) and second split parts (322), the first split parts (321) being connected to the tab of the first battery cell, the second split parts (322) being connected to the tab of the second battery cell, and the first split parts (321) and the second split parts (322) being connected together.

22. A battery pack, characterized in that, The battery includes any one of claims 1 to 10.

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