Single battery, battery pack and power utilization device
By designing a single cell including a housing, a battery cell and a first bus element on a large cylindrical cell, the problem of poor electrical connection stability between the pole ear and the bus plate is solved, and better conductive performance is achieved and Battery life.
Patent Information
- Application Number
- CN202420916842.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The electrical connection stability and reliability between the pole ears and busbars of existing large cylindrical cells is poor, which affects the conductivity of the battery and thus affects the cycling performance and service life of the battery cells.
A single cell is designed, including a housing, a battery cell and a first confluence member. The first confluent includes a first connection part, a second connection part and a third connection part, the third connection part is arranged at one end of the battery cell close to the opening, extends toward a side wall away from the housing, and is electrically connected to the first pole ear. , forming a stable electrical connection.
By improving the stability and reliability of the electrical connection between the electrode ear and the bus element, the conductivity of the single battery is improved, the service life of the battery cell is extended, and the cycling performance of the battery cell is guaranteed.
Smart Images
Figure CN222463349U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a single cell, a battery pack and an electrical device. Background Art
[0002] As the requirements for cell performance of power batteries continue to increase, large cylindrical batteries are a major development direction of current power batteries. Currently, large cylindrical batteries are developing rapidly in the market. In its manufacturing process, the positive and negative electrodes use a full-ear process, which is flattened after winding, and then welded to the busbar, and finally assembled into a single battery. However, in the related technology, the electrical connection stability and reliability between the ear and busbar of the large cylindrical battery cell are poor, which affects the conductivity of the battery, thereby affecting the cycle performance and service life of the battery cell. Utility Model Content
[0003] In order to achieve the above-mentioned purpose, the present application is based on this, and the purpose of the present application is to provide a single cell battery, aiming to solve the technical problem that the electrical connection stability and reliability between the pole ear and the busbar of the large cylindrical battery cell in the prior art are poor, which affects the conductive performance of the battery and thus affects the cycle performance and service life of the battery cell.
[0004] The technical solutions adopted are as follows:
[0005] In a first aspect, an embodiment of the present application provides a single cell, comprising:
[0006] A shell having a receiving cavity with an opening at one end; the shell having a bottom wall and a side wall connected to the bottom wall, the bottom wall being opposite to the opening;
[0007] A battery cell is disposed in the accommodating cavity, and a first pole ear is disposed at one end of the battery cell facing the opening;
[0008] A first busbar is arranged in the accommodating cavity, and the first busbar includes a first connecting portion, a second connecting portion and a third connecting portion. The first connecting portion is arranged on the bottom wall of the shell and extends toward the side wall of the shell, and the second connecting portion is respectively connected to the first connecting portion and the third connecting portion. The second connecting portion is arranged on the side wall of the shell and extends toward the opening. The third connecting portion is arranged at an end of the battery cell close to the opening and extends in a direction away from the side wall of the shell, and the third connecting portion is electrically connected to the first pole ear on a side away from the opening.
[0009] In one embodiment of the first aspect, a limiting groove is defined on a side wall of the housing, and the second connecting portion is disposed in the limiting groove.
[0010] In one embodiment of the first aspect, a width of the limiting groove gradually decreases along a direction away from the side wall of the shell.
[0011] In one of the embodiments of the first aspect, a plurality of the limit grooves are provided, and the plurality of the limit grooves are arranged circumferentially at intervals along the side wall of the shell; a plurality of the first busbars are provided, and the plurality of the first busbars are arranged circumferentially at intervals along the side wall of the shell, and each of the first busbars is respectively clamped in one of the limit grooves, and the third connecting portion of each of the first busbars is electrically connected to the first pole ear.
[0012] In one embodiment of the first aspect, a plurality of first busbars are provided, and the plurality of first busbars are circumferentially spaced apart along the side wall of the shell, and the third connection portion of each first busbar is connected to the first pole ear on a side away from the opening, and the third connection portion extends to the edge of the center hole of the battery cell.
[0013] In one embodiment of the first aspect, the single battery further includes a cover, the cover is disposed on the opening, and a side of the third connection portion away from the first electrode tab is connected to the cover.
[0014] In one of the embodiments of the first aspect, the single cell battery further includes a pole and a second current collector, a through hole is formed in the bottom wall of the shell, a second pole lug is provided at one end of the battery cell facing the through hole, the pole passes through the through hole, one end of the pole is located outside the accommodating cavity, and the other end is located inside the accommodating cavity, the second current collector is provided in the accommodating cavity, and is respectively connected to the second pole lug and the pole.
[0015] In one embodiment of the first aspect, the single battery further includes an insulating seal, which is disposed in the through hole and abuts between a circumferential wall of the pole and a hole wall of the through hole.
[0016] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a single cell battery as described in any of the above embodiments.
[0017] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery pack described in the above embodiment.
[0018] The beneficial effects of the present application are as follows: the present application proposes a single cell battery, the single cell battery comprises a shell, a battery cell and a first current collector, the first current collector comprises a first connection part, a second connection part and a third connection part, the shell has a receiving cavity with an opening at one end, the battery cell and the first current collector are arranged in the receiving cavity, and the battery cell is provided with a first pole ear at one end facing the opening. By arranging the third connection part at one end of the battery cell close to the opening and extending in a direction away from the side wall of the shell, and connecting the side of the third connection part away from the opening to the first pole ear, the first current collector is electrically connected to the first pole ear through the third connection part and the current generated by the first pole ear is collected on the shell to form the negative electrode of the single cell battery. At the same time, the second connecting part is connected to the first connecting part and the third connecting part respectively. The first connecting part is arranged on the bottom wall of the shell and extends toward the side wall of the shell, and the second connecting part is arranged on the side wall of the shell and extends toward the opening. In this way, the first busbar is firmly arranged on the shell as a whole and is stably electrically connected to the shell, which effectively improves the stability and reliability of the electrical connection between the third connecting part and the first pole ear, thereby effectively improving the stability and reliability of the electrical connection between the first busbar and the first pole ear, ensuring the conductive performance of the single cell, and further ensuring the cycle performance of the battery cell and extending the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A three-dimensional schematic diagram of a single battery in some embodiments of the present application is shown;
[0021] Figure 2 A schematic cross-sectional view of a single cell in some embodiments of the present application is shown;
[0022] Figure 3 Shows Figure 2 A magnified schematic diagram of the structure of the middle A section;
[0023] Figure 4 Shows Figure 2 A magnified schematic diagram of the structure of the middle B section;
[0024] Figure 5 A three-dimensional schematic diagram of a single battery without a cover in some embodiments of the present application is shown;
[0025] Figure 6 It shows a cross-sectional schematic diagram of a single cell without a cover in some embodiments of the present application;
[0026] Figure 7 A three-dimensional schematic diagram of a housing and a first busbar in some embodiments of the present application is shown;
[0027] Figure 8 A schematic cross-sectional view of a housing and a first busbar in some embodiments of the present application is shown;
[0028] Fig. 9 A three-dimensional schematic diagram of a shell in some embodiments of the present application is shown.
[0029] Description of main component symbols:
[0030] 100-single battery; 110-shell; 111-accommodating chamber; 112-opening; 113-limiting groove; 114-through hole; 120-battery cell; 121-first pole ear; 122-second pole ear; 130-first busbar; 131-first connecting part; 132-second connecting part; 133-third connecting part; 140-cover; 150-pole; 160-second busbar; 170-insulating seal. DETAILED DESCRIPTION
[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the embodiment of the present application provides a single battery 100, which is mainly used in a battery pack, and the battery pack is mainly used in an electric device. The single battery 100 includes a housing 110, a battery cell 120 and a first busbar 130.
[0037] See also Figure 5 and Figure 6 , wherein the shell 110 has a accommodating cavity 111 with an opening 112 at one end, the shell 110 has a bottom wall and a side wall connected to the bottom wall, the bottom wall is opposite to the opening 112, the battery cell 120 is arranged in the accommodating cavity 111, and the first pole ear 121 is provided at one end of the battery cell 120 facing the opening 112.
[0038] The first busbar 130 is arranged in the accommodating cavity 111, and the first busbar 130 includes a first connecting portion 131, a second connecting portion 132 and a third connecting portion 133. The first connecting portion 131 is arranged on the bottom wall of the shell 110 and extends toward the side wall of the shell 110, and the second connecting portion 132 is respectively connected to the first connecting portion 131 and the third connecting portion 133, the second connecting portion 132 is arranged on the side wall of the shell 110 and extends toward the opening 112, and the third connecting portion 133 is arranged at an end of the battery cell 120 close to the opening 112 and extends in a direction away from the side wall of the shell 110, and the side of the third connecting portion 133 away from the opening 112 is electrically connected to the first pole ear 121.
[0039] The single cell battery 100 provided in the embodiment of the present application is configured such that the third connecting portion 133 is disposed at one end of the battery cell 120 close to the opening 112 and extends in a direction away from the side wall of the shell 110, and the side of the third connecting portion 133 away from the opening 112 is connected to the first pole ear 121, so that the first busbar 130 is electrically connected to the first pole ear 121 through the third connecting portion 133 and the current generated by the first pole ear 121 is converged to the shell 110 to form the negative electrode of the single cell battery 100.
[0040] At the same time, the second connecting part 132 is connected to the first connecting part 131 and the third connecting part 133 respectively. By setting the first connecting part 131 on the bottom wall of the shell 110 and extending toward the side wall of the shell 110, and the second connecting part 132 is set on the side wall of the shell 110 and extends toward the opening 112, the first bus 130 is firmly set on the shell 110 as a whole and is stably electrically connected to the shell 110, which effectively improves the stability and reliability of the electrical connection between the third connecting part 133 and the first pole ear 121, thereby effectively improving the stability and reliability of the electrical connection between the first bus 130 and the first pole ear 121, ensuring the conductive performance of the single battery 100, and further ensuring the cycle performance of the battery cell 120 and extending the service life of the battery cell 120.
[0041] Exemplarily, the first connection portion 131, the second connection portion 132 and the third connection portion 133 can be made of copper, aluminum or other metal materials in one piece. The first connection portion 131 can be arranged on the bottom wall of the housing 110 by welding, the second connection portion 132 can be arranged on the side wall of the housing 110 by clamping or welding, and the third connection portion 133 can be connected to the first pole ear 121 by welding.
[0042] like Figure 5 , Figure 8 and Fig. 9As shown, in one embodiment of the present application, optionally, a limiting groove 113 is provided on the side wall of the shell 110 , and the second connecting portion 132 is disposed in the limiting groove 113 .
[0043] In this embodiment, a limiting groove 113 is opened on the side wall of the shell 110, and the second connecting part 132 is arranged in the limiting groove 113, so that the limiting groove 113 can limit the second connecting part 132, thereby preventing the second connecting part 132 from moving circumferentially along the side wall of the shell 110 and affecting the stability and reliability of the electrical connection between the third connecting part 133 and the first pole ear 121.
[0044] Exemplarily, the limiting groove 113 can be opened on the side wall of the housing 110 by machining, or can be integrally injection molded by the housing 110 .
[0045] In the above-mentioned embodiment of the present application, optionally, the width of the limiting groove 113 gradually decreases along the direction away from the side wall of the shell 110 .
[0046] In this embodiment, the width of the limiting groove 113 is gradually reduced in the direction away from the side wall of the shell 110, so that the second connecting part 132 is further limited by the limiting groove 113, so that the second connecting part 132 is firmly set in the limiting groove 113, and the second connecting part 132 is prevented from moving in the direction away from the side wall of the shell 110 to affect the stability and reliability of the electrical connection between the third connecting part 133 and the first pole ear 121.
[0047] like Figure 5 , Figure 8 and Fig. 9 As shown, in the above embodiment of the present application, optionally, a plurality of the limiting grooves 113 are provided, and the plurality of limiting grooves 113 are arranged at intervals along the circumferential direction of the side wall of the shell 110 .
[0048] In this embodiment, the number of the limiting grooves 113 is set to be multiple, and the multiple limiting grooves 113 are spaced apart along the circumferential direction of the side wall of the shell 110, so that the multiple second connecting parts 132 of the multiple first busbars 130 can be limited by the multiple limiting grooves 113, thereby preventing the multiple second connecting parts 132 of the multiple first busbars 130 from moving along the circumferential direction of the side wall of the shell 110 and affecting the stability and reliability of the electrical connection between the multiple third connecting parts 133 of the multiple first busbars 130 and the first pole ear 121.
[0049] like Figure 5 , Figure 6 and Figure 7As shown, in one embodiment of the present application, optionally, a plurality of the first busbars 130 are provided, and the plurality of the first busbars 130 are circumferentially spaced apart along the side wall of the shell 110 , and the third connecting portion 133 of each of the first busbars 130 is connected to the first pole ear 121 on a side away from the opening 112 .
[0050] In this embodiment, by setting the number of first busbars 130 to be multiple, and arranging the multiple first busbars 130 circumferentially spaced apart along the side wall of the shell 110, and the third connection portion 133 of each first busbar 130 is connected to the first pole ear 121 on the side away from the opening 112, the stability and reliability of the electrical connection between the first busbar 130 and the first pole ear 121 can be further improved, the conductive performance of the single battery 100 can be further guaranteed, and the cycle performance of the battery cell 120 can be further guaranteed and the service life of the battery cell 120 can be extended.
[0051] Exemplarily, the connection between the third connection portion 133 of each first busbar 130 and the first pole lug 121 can be welding. The third connection portion 133 of each first busbar 130 extends to the edge of the center hole of the battery cell 120, which can avoid covering the center hole and also can well increase the contact area between the first busbar 130 and the first pole lug 121.
[0052] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment of the present application, optionally, the single battery 100 further includes a cover 140 , the cover 140 is disposed on the opening 112 , and the side of the third connection portion 133 away from the first pole ear 121 is connected to the cover 140 .
[0053] In this embodiment, the cover 140 is placed on the opening 112 to close the opening 112, so as to prevent water or dust from entering the accommodating cavity 111 through the opening 112 and affecting the service life of the battery cell 120. At the same time, the third connecting portion 133 is connected to the cover 140 at a side away from the first pole tab 121, so that the first bus 130 is electrically connected to the first pole tab 121 through the third connecting portion 133 and the current generated by the first pole tab 121 is converged to the cover 140 and the housing 110 to form the negative electrode of the single battery 100.
[0054] Exemplarily, the third connection portion 133 and the cover body 140 may be connected by welding, and the sealing method between the cover body 140 and the end wall of the opening 112 may be mechanical rolling groove sealing or welding sealing.
[0055] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, in any of the above embodiments of the present application, optionally, the single cell 100 further includes a pole 150 and a second current collector 160, a through hole 114 is opened on the bottom wall of the shell 110, and a second pole ear 122 is provided at one end of the battery cell 120 facing the through hole 114, the pole 150 is passed through the through hole 114, one end of the pole 150 is located outside the accommodating cavity 111, and the other end is located inside the accommodating cavity 111, and the second current collector 160 is arranged in the accommodating cavity 111, and is respectively connected to the second pole ear 122 and the pole 150.
[0056] In this embodiment, by arranging the second busbar 160 in the accommodating cavity 111 and connecting the second pole lug 122 and the pole 150 respectively, the second busbar 160 can be connected to the second pole lug 122 and converge the current generated by the second pole lug 122 to the pole 150 to form the positive electrode of the single cell 100.
[0057] Exemplarily, the through hole 114 can be opened on the bottom wall of the housing 110 by machining, or can be integrally injection molded from the housing 110 , and the second bus 160 and the second pole lug 122 and the pole 150 can be connected by welding.
[0058] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, in the above embodiment of the present application, optionally, the single cell 100 further includes an insulating seal 170 , which is disposed in the through hole 114 and abuts between the circumferential wall of the pole 150 and the hole wall of the through hole 114 .
[0059] In this embodiment, an insulating seal 170 is provided in the through hole 114 so as to abut against the circumferential wall of the pole 150 and the hole wall of the through hole 114 to play an insulating and sealing role, thereby preventing the pole 150 from contacting the shell 110 and causing a short circuit in the single battery 100, and at the same time preventing external water or dust from entering the accommodating cavity 111 through the through hole 114 and affecting the service life of the battery cell 120.
[0060] An embodiment of the present application further provides a battery pack, comprising a single cell 100 in any of the above embodiments.
[0061] The battery pack has the single cell 100 in any of the above embodiments, and thus has all the beneficial effects of the single cell 100, which will not be described in detail here.
[0062] An embodiment of the present application further provides an electrical device, comprising the battery pack in the above embodiment.
[0063] The electrical device has the battery pack in any of the above embodiments, and thus has all the beneficial effects of the battery pack, which will not be described in detail here.
[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A single cell battery, characterized in that: include: A housing (110) having a receiving cavity (111) with an opening (112) at one end, the housing (110) having a bottom wall and a side wall connected to the bottom wall, the bottom wall being opposite to the opening (112); A battery cell (120) is arranged in the accommodating cavity (111), and a first pole lug (121) is arranged at one end of the battery cell (120) facing the opening (112); A first busbar (130) is arranged in the accommodating cavity (111), and the first busbar (130) comprises a first connecting portion (131), a second connecting portion (132) and a third connecting portion (133); the first connecting portion (131) is arranged on the bottom wall of the shell (110) and extends toward the side wall of the shell (110); the second connecting portion (132) is respectively connected to the first connecting portion (131) and the third connecting portion (133); the second connecting portion (132) is arranged on the side wall of the shell and extends toward the opening (112); the third connecting portion (133) is arranged at one end of the battery cell (120) close to the opening (112) and extends in a direction away from the side wall of the shell (110); and the side of the third connecting portion (133) away from the opening (112) is electrically connected to the first pole lug (121).
2. The single cell according to claim 1, characterized in that: A limiting groove (113) is provided on the side wall of the housing (110), and the second connecting portion (132) is arranged in the limiting groove (113).
3. The single cell according to claim 2, characterized in that: Along the direction away from the side wall of the housing (110), the width of the limiting groove (113) gradually decreases.
4. The single cell according to claim 2, characterized in that: A plurality of the limiting grooves (113) are provided, and the plurality of the limiting grooves (113) are arranged at intervals along the circumferential direction of the side wall of the shell (110); a plurality of the first current collectors (130) are provided, and the plurality of the first current collectors (130) are arranged at intervals along the circumferential direction of the side wall of the shell (110), and each of the first current collectors (130) is respectively clamped in one of the limiting grooves (113), and the third connecting portion (133) of each of the first current collectors (130) is electrically connected to the first pole lug (121).
5. The single cell according to claim 1, characterized in that: A plurality of the first busbars (130) are provided, and the plurality of the first busbars (130) are arranged circumferentially spaced apart from each other along the side wall of the shell (110), and the third connecting portion (133) of each of the first busbars (130) is connected to the first pole lug (121) on a side away from the opening (112), and the third connecting portion (133) extends to the edge of the center hole of the battery cell (120).
6. The single cell according to claim 1, characterized in that: The single cell (100) further comprises a cover (140), wherein the cover (140) is disposed on the opening (112), and a side of the third connection portion (133) away from the first electrode tab (121) is connected to the cover (140).
7. The single cell according to any one of claims 1 to 6, characterized in that: The single cell (100) further comprises a pole (150) and a second current collector (160); a through hole (114) is provided on the bottom wall of the shell (110); a second pole lug (122) is provided at one end of the battery cell (120) facing the through hole (114); the pole (150) is passed through the through hole (114); one end of the pole (150) is located outside the accommodating cavity (111) and the other end is located inside the accommodating cavity (111); the second current collector (160) is provided inside the accommodating cavity (111) and is respectively connected to the second pole lug (122) and the pole (150).
8. The single cell according to claim 7, characterized in that: The single cell (100) further comprises an insulating seal (170), wherein the insulating seal (170) is arranged in the through hole (114) and abuts against a circumferential wall of the pole (150) and a hole wall of the through hole (114).
9. A battery pack, characterized in that: A single cell (100) comprising any one of claims 1 to 8.
10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.