Plug-in cylindrical battery, battery module, and battery pack

Abstract

The utility model discloses a kind of plug-in cylindrical batteries, battery module and battery pack, battery body negative pole end is equipped with pole post, positive pole end is equipped with plug block, plug block is equipped with insertion hole, when multiple cylindrical batteries are connected in series and parallel, 2 cylindrical batteries are arranged upside down, adjacent pole post is inserted into insertion hole, 2 cylindrical batteries are connected in series, and pole post is equipped with parallel connection sheet, plug block is pressed in the negative pole side of cylindrical battery, and parallel connection sheet is connected in parallel with 2 groups of adjacent cylindrical batteries arranged upside down.It is beneficial to effect: the utility model optimizes the structure of cylindrical battery, realizes plug-in series connection, and realizes parallel connection by plug block being pressed in negative pole end with parallel connection sheet, and realizes the close connection of parallel connection sheet.Through positive pole support and negative pole support fixed single-layer cylindrical battery, further ensure that cylindrical battery is effectively plugged in and closely plugged in, through bracket buckle and bracket clamping groove are clamped with positive pole support and negative pole support, further improve the close connection of parallel connection sheet, improve the safety and stability of battery module.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to a plug-in cylindrical battery, a battery module, and a battery pack. Background Technology

[0002] Cylindrical batteries are becoming increasingly widely used in the power and energy storage fields due to their unique flexibility. When used in a complete system, multiple batteries are usually connected in series and parallel to construct a complete battery pack.

[0003] When batteries are connected in series and parallel, the current-carrying plates need to be tightly connected to the positive and negative terminals of the battery, and the connection resistance should be as low as possible. Furthermore, during battery operation, current flows through the current-carrying plates, which need to be tightly connected to the battery to ensure smooth current flow and reduce heat generation. If the current-carrying plates move relative to the battery during operation, the connection may become loose, leading to overheating when a large current flows through, increasing heat generation and affecting voltage acquisition accuracy. Moreover, if the current-carrying plates are loose, the positive and negative terminals may not be properly inserted, resulting in insufficient contact area and preventing the passage of large currents. In some cases, excessive current may cause abnormal heating, potentially leading to thermal runaway and fires. Therefore, the current method for series and parallel connection involves welding aluminum current-carrying plates to the battery to securely connect them. However, welding is prone to problems such as incomplete soldering and missed soldering, affecting the safety and stability of the battery pack. Furthermore, welding has a long processing cycle and requires high-level welding technology. In addition, welding makes it inconvenient to replace and maintain batteries. If one or several individual cells fail, the entire battery pack may become unusable, increasing the cost of using the battery pack. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a plug-in cylindrical battery, battery module, and battery pack. It optimizes the structure of the cylindrical battery, enabling plug-in series connection. Parallel segments are pressed against the negative terminal of the cylindrical battery by insert blocks, achieving parallel connection and tight connection of the parallel segments. A single-layer cylindrical battery is fixed by positive and negative electrode brackets, further ensuring effective and tight plug-in connection between the upper and lower layers. The upper and lower layers are secured by bracket clips and bracket slots, further improving the tightness of the parallel segment connection and enhancing the safety and stability of the battery module.

[0005] The purpose of this utility model is achieved through the following technical measures: a plug-in cylindrical battery, including a battery body, with positive and negative terminals at both ends. The negative terminal is provided with a terminal post, and the positive terminal is provided with a plug. The plug has a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged vertically, and adjacent terminal posts are inserted into the socket of the plug. The two cylindrical batteries are connected in series, and a parallel connecting piece is fitted on the terminal post. The plug presses the parallel connecting piece against the negative terminal side of the cylindrical battery, and the parallel connecting piece connects two adjacent sets of vertically arranged cylindrical batteries in parallel.

[0006] In some embodiments, the side wall of the pole insert is provided with a locking protrusion, and the side wall of the insertion hole is provided with a locking groove, the locking protrusion and the locking groove being used in conjunction.

[0007] A battery module includes the cylindrical battery, and the cylindrical batteries form at least two battery columns connected in parallel by parallel plates. Each battery column includes at least two cylindrical batteries that are inserted vertically. Each cylindrical battery is provided with a positive electrode bracket and a negative electrode bracket. The side walls of the positive electrode bracket and the negative electrode bracket are provided with splicing blocks and / or splicing slots.

[0008] In some embodiments, the negative electrode support includes a negative electrode support body, a negative electrode receiving groove at the bottom of the negative electrode support body, a through hole for the electrode post at the top of the negative electrode support body, a support buckle on the circumferential side of the through hole for the electrode post, and a buckle notch for the passage of parallel connecting pieces; the positive electrode support includes a positive electrode support body, a hollow channel through the top and bottom of the positive electrode support body, a partition in the hollow channel, a through hole for the insertion block in the partition, the partition dividing the hollow channel into a positive electrode receiving groove at the top and a buckle receiving groove at the bottom, a support slot on the side wall of the buckle receiving groove for use with the support buckle.

[0009] In some embodiments, the positive electrode support body is further provided with a parallel piece notch on the side wall of the snap-fit ​​receiving groove, and the parallel piece notch and the snap-fit ​​notch together form a parallel piece channel.

[0010] In some embodiments, the parallel plate includes multiple connecting plates, each connecting plate having parallel holes, and the multiple connecting plates are connected by connecting strips, with each connecting plate being connected to at least two connecting strips.

[0011] In some embodiments, at least one connection piece is connected to a sampling piece.

[0012] In some embodiments, two adjacent battery columns are arranged side by side or staggered.

[0013] A battery pack includes a housing containing a battery pack. The housing has a connector, and the positive and negative terminals of the battery pack are connected to the connector. The battery pack includes at least one of the battery modules, and the two ends of the battery module are respectively connected to a main positive connector and a main negative connector. When there are multiple battery modules, the multiple battery modules are connected in series.

[0014] In some embodiments, a BMS device is also included, which is disposed within the housing, and the main positive connection piece and the main negative connection piece of each battery module are connected to the BMS device.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a plug-in cylindrical battery, battery module, and battery pack. By changing the structure of the negative and positive terminals of the cylindrical battery, the cylindrical batteries can be connected in series. The parallel connection of the cylindrical batteries is achieved by pressing the parallel plates against the negative terminal of the cylindrical battery through the plug at the positive terminal. Finally, the series and parallel connection of the battery module is realized. This utility model changes the traditional series and parallel welding method and uses a mechanical connection method to realize the series and parallel connection of the cylindrical batteries. The battery module can be quickly assembled and replaced, simplifying the process and reducing the cost of use. The tight connection of the parallel plates is achieved by setting the plug and the terminal plug. Furthermore, the side of the terminal plug is made in contact with the side of the socket by the plug, ensuring the contact area of ​​the positive and negative terminals so as to facilitate the flow of large current. Furthermore, this invention features connectable positive and negative electrode supports at both ends of the cylindrical battery. The connection of these supports secures the single-layer cylindrical battery, further ensuring effective and tight insertion of the upper and lower layers. Additionally, this invention includes a support buckle on the negative electrode support and a support slot on the positive electrode support. The buckle and slot engage the upper and lower layers of cylindrical batteries, clamping the positive and negative electrode supports together in parallel. This further enhances the tightness of the parallel connection, prevents movement, and improves the safety and stability of the battery module.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a plug-in cylindrical battery.

[0018] Figure 2 This is a schematic diagram of the assembly structure of two cylindrical batteries and parallel plates.

[0019] Figure 3 This is a structural diagram of the battery module. Figure 1 .

[0020] Figure 4 This is a structural diagram of the battery module. Figure 2 .

[0021] Figure 5 This is a schematic diagram of the negative electrode support structure. Figure 1 .

[0022] Figure 6 This is a schematic diagram of the positive electrode support structure. Figure 1 .

[0023] Figure 7 This is a schematic diagram of the connection between the positive electrode support and the negative electrode support.

[0024] Figure 8 This is a structural diagram of the battery module. Figure 3 .

[0025] Figure 9 This is a schematic diagram of the negative electrode support structure. Figure 2 .

[0026] Figure 10 This is a schematic diagram of the positive electrode support structure. Figure 2 .

[0027] Figure 11 This is a schematic diagram of the parallel plate structure. Figure 1 .

[0028] Figure 12 This is a schematic diagram of the parallel plate structure. Figure 2 .

[0029] Figure 13 This is a schematic diagram of the structure of the main positive connecting piece.

[0030] Figure 14 This is a schematic diagram of the structure of the main negative connection piece.

[0031] Figure 15 This is a schematic diagram of the battery pack structure.

[0032] The components are as follows: 1. Battery body; 2. Terminal post insert; 3. Insert block; 4. Locking block protrusion; 5. Parallel plate; 6. Negative terminal bracket; 7. Positive terminal bracket; 8. Terminal post through hole; 9. Bracket buckle; 10. Buckle notch; 11. Splicing block; 12. Splicing slot; 13. Positive terminal receiving slot; 14. Bracket slot; 15. Buckle receiving slot; 16. Parallel plate notch; 17. Parallel hole; 18. Connecting strip; 19. Sampling plate; 20. Total positive connecting plate; 21. Total negative connecting plate; 22. Housing; 23. Connector; 24. BMS device. Detailed Implementation

[0033] like Figures 1 to 15As shown, a plug-in cylindrical battery includes a battery body 1, with a positive terminal and a negative terminal at both ends. The negative terminal is provided with a terminal post 2, and the positive terminal is provided with a plug block 3. The plug block 3 is provided with a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged vertically, and adjacent terminal post 2s are inserted into the sockets of the plug block 3 to connect the two cylindrical batteries in series. A parallel connecting piece 5 is fitted on the terminal post 2, and the plug block 3 presses the parallel connecting piece 5 against the negative terminal side of the cylindrical battery. The parallel connecting piece 5 connects two adjacent sets of vertically arranged cylindrical batteries in parallel. When the terminal post 2 is inserted into the socket, the side wall of the negative terminal post 2 contacts the inner wall of the positive terminal block 3 socket, and the cylindrical batteries arranged vertically are connected in series. The positive and negative terminals are connected through the side, increasing the current flow area. The parallel plate 5 enables the parallel connection of two adjacent rows of batteries, and the parallel plate 5 is pressed by the block 3. This changes the traditional welding method of series and parallel connection. This utility model realizes the series and parallel connection of cylindrical batteries through mechanical connection and achieves a tight connection of the parallel plate 5.

[0034] In some embodiments, the side wall of the pole post 2 is provided with a retaining protrusion 4, and the side wall of the insertion hole is provided with a retaining groove, the retaining protrusion 4 cooperating with the retaining groove. Specifically, when the pole post 2 is inserted into the insertion hole, the retaining protrusion 4 is embedded in the retaining groove. More preferably, the retaining protrusion 4 is an annular protrusion, and the retaining groove is an annular retaining groove. The arrangement of the retaining protrusion 4 and the retaining groove increases the connection stability between the pole post 2 and the insertion hole, further ensuring the tight connection of the parallel piece 5.

[0035] A battery module includes cylindrical batteries, and the cylindrical batteries form at least two battery rows connected in parallel by parallel connecting pieces 5. Each battery row includes at least two cylindrical batteries inserted vertically. Each cylindrical battery is provided with a positive electrode bracket 7 and a negative electrode bracket 6. The side walls of the positive electrode bracket 7 and the negative electrode bracket 6 are provided with splicing blocks 11 and / or splicing slots 12. Adjacent positive electrode brackets 7 are spliced ​​by splicing blocks 11 and splicing slots 12, and adjacent negative electrode brackets 6 are spliced ​​by splicing blocks 11 and splicing slots 12. When multiple cylindrical batteries are assembled into a battery module, positive electrode brackets 7 and negative electrode brackets 6 are respectively fitted at both ends of each cylindrical battery. The parallel connecting piece 5 is fitted onto the terminal post 2 that passes through the top of the negative electrode bracket 6, and the terminal post 2 is inserted into the insertion hole of the insertion block 3 that passes through the bottom of the positive electrode bracket 7. The insertion block 3 and the positive electrode bracket 7 press the parallel connecting piece 5 tightly against the top of the negative electrode bracket 6. By splicing the positive electrode bracket 7 and the negative electrode bracket 6, the single-layer cylindrical battery is fixed, ensuring effective and tight insertion of the upper and lower cylindrical batteries.

[0036] In some embodiments, the negative electrode bracket 6 includes a negative electrode bracket body, the bottom of which has a negative electrode receiving groove, and the top of which has an electrode post through hole 8. A bracket buckle 9 is provided on the circumference of the electrode post through hole 8, and the bracket buckle 9 has a buckle notch 10 for passage of the parallel connecting piece 5. The positive electrode bracket 7 includes a positive electrode bracket body, which has a hollow channel connecting the top and bottom of the bracket body. A partition is provided inside the hollow channel, and an insertion block through hole is provided on the partition. The partition divides the hollow channel into a positive electrode receiving groove 13 at the top and a buckle receiving groove 15 at the bottom. A bracket slot 14 is provided on the side wall of the buckle receiving groove 15, and the bracket slot 14 cooperates with the bracket buckle 9. When the cylindrical batteries are inserted one above the other, the bracket clip 9 on the negative electrode bracket body can be inserted into the bracket slot 14 on the positive electrode bracket body. The bracket clip 9 and the bracket slot 14 engage the adjacent positive electrode bracket 7 and negative electrode bracket 6, thus fixing the positive electrode bracket 7 and negative electrode bracket 6 relatively. By engaging the upper and lower cylindrical batteries through the bracket clip 9 and the bracket slot 14, the positive electrode bracket 7 and negative electrode bracket 6 are clamped together in parallel with the connecting piece 5, further improving the tightness of the connection of the connecting piece 5.

[0037] In some embodiments, the positive electrode support body is further provided with a parallel piece notch 16 on the side wall of the snap-fit ​​receiving groove 15, and the parallel piece notch 16 and the snap-fit ​​notch 10 together form a parallel piece 5 channel.

[0038] In some embodiments, the parallel plate 5 includes multiple connecting plates, each with a parallel hole 17 for mounting the electrode post 2. The multiple connecting plates are connected by connecting strips 18, with each connecting plate connected to at least two connecting strips 18. Specifically, when the positive electrode bracket 7 and the negative electrode bracket 6 are engaged, the connecting strips 18 can pass through the parallel plate channel.

[0039] In some embodiments, at least one connector is connected to a sampling chip 19. After the battery module is plugged in, the sampling chip 19 can be connected to the sampling line for voltage sampling.

[0040] In some embodiments, two adjacent battery columns are arranged side by side or staggered.

[0041] A battery pack includes a housing 22 containing a battery pack. A connector 23 is provided on the housing 22, and both the positive and negative terminals of the battery pack are connected to the connector 23. The battery pack includes at least one battery module, and each battery module has a main positive connector 20 and a main negative connector 21 connected to its two ends. When there are multiple battery modules, they are connected in series. Specifically, when the battery pack includes only one battery module, the main positive connector 20 and the main negative connector 21 of that battery module are connected to the connector 23. When the battery pack includes multiple battery modules, the main positive connector 20 and the main negative connector 21 of the multiple battery modules are connected in series via cables or copper busbars. Specifically, the main positive connector 20 of one battery module can be connected to the main negative connector 21 of another battery module via cables or copper busbars, thus connecting multiple battery modules in series.

[0042] It should be noted that this utility model does not specifically limit the connection method between the positive connecting piece 20, the negative connecting piece 21, and the battery module. For example, multiple connecting holes can be opened on the negative connecting piece 21, the connecting holes can be fitted onto the terminal plug 2, and fasteners can be fitted onto the terminal plug 2 to press the negative connecting piece 21 against the negative terminal of the battery module. Alternatively, multiple plugs with insertion holes can be provided on the negative connecting piece 21, and the connection between the negative connecting piece 21 and the battery module can be achieved by inserting the terminal plug 2 into the insertion holes. Multiple plugs or slots can be provided on the positive connecting piece 20, and the plugs can be inserted into the positive plug 3 or the positive plug 3 can be inserted into the slots to achieve the connection between the positive connecting piece 20 and the positive terminal of the battery module.

[0043] In some embodiments, a BMS device 24 is also included, which is disposed within the housing 22, and the total positive connection piece 20 and the total negative connection piece 21 of each battery module are connected to the BMS device 24.

[0044] Furthermore, the sampling chip 19 of each parallel chip 5 of the battery module is also connected to the BMS device 24.

[0045] Example 1 Prepare two plug-in cylindrical batteries as described in this utility model, labeled 1# and 2#. Measure the internal resistance of the two batteries using an internal resistance tester; the values ​​are 0.76 mΩ and 0.78 mΩ, respectively. Connect the positive terminal of battery 1# to the negative terminal of battery 2#, and use the insert of battery 1# to press the parallel connection plate firmly onto the negative terminal of battery 2#. After the batteries are tightly connected, measure the resistance between the negative terminal of battery 1# and the positive terminal of battery 2#; the value is 1.72 mΩ.

[0046] Comparative Example 1 Prepare two cylindrical batteries with a conventional structure, labeled #3 and #4. Measure the internal resistance of the two batteries using an internal resistance tester; the values ​​are 0.73 mΩ and 0.82 mΩ, respectively. Connect the positive terminal of battery #3 and the negative terminal of battery #4 in series using a connecting piece and weld them together using a laser welding machine. After welding, measure the resistance between the negative terminal of battery #3 and the positive terminal of battery #4; the value is 1.7 mΩ.

[0047] As can be seen from Example 1 and Comparative Example 1, when the internal resistance of a single cylindrical battery is nearly the same, the plug-in connection method disclosed in this application can basically achieve the same resistance as the welding connection method in the prior art. This indicates that the plug-in cylindrical battery disclosed in this utility model can achieve the connection performance level of laser welding in the prior art, that is, it has a lower contact resistance.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions 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 suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A plug-in cylindrical battery, characterized in that: The battery includes a battery body with a positive terminal and a negative terminal at its two ends. The negative terminal has a terminal post, and the positive terminal has a plug. The plug has a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged vertically, and adjacent terminal posts are inserted into the sockets of the plug. The two cylindrical batteries are connected in series, and parallel plates are fitted on the terminal posts. The plug presses the parallel plates against the negative terminal side of the cylindrical batteries, and the parallel plates connect two adjacent sets of vertically arranged cylindrical batteries in parallel.

2. The plug-in cylindrical battery according to claim 1, characterized in that: The side wall of the pole insert is provided with a locking protrusion, and the side wall of the insertion hole is provided with a locking groove. The locking protrusion and the locking groove are used in conjunction.

3. A battery module, characterized in that: The invention includes the cylindrical battery as described in any one of claims 1-2, wherein the cylindrical batteries form at least two battery columns connected in parallel by parallel plates, each battery column includes at least two cylindrical batteries inserted vertically, each cylindrical battery is provided with a positive electrode bracket and a negative electrode bracket, and the side walls of the positive electrode bracket and the negative electrode bracket are provided with splicing blocks and / or splicing slots.

4. The battery module according to claim 3, characterized in that: The negative electrode support includes a negative electrode support body. The bottom of the negative electrode support body has a negative electrode receiving groove, and the top of the negative electrode support body has an electrode post through hole. A support buckle is provided on the circumference of the electrode post through hole, and the support buckle has a buckle notch for passage of parallel connecting pieces. The positive electrode support includes a positive electrode support body. The positive electrode support body has a hollow channel connecting the top and bottom of the support body. A partition is provided inside the hollow channel, and an insertion block through hole is provided on the partition. The partition divides the hollow channel into a positive electrode receiving groove at the top and a buckle receiving groove at the bottom. A support slot is provided on the side wall of the buckle receiving groove, and the support slot cooperates with the support buckle.

5. The battery module according to claim 4, characterized in that: The positive electrode support body is also provided with a parallel plate notch on the side wall of the buckle receiving groove. The parallel plate notch and the buckle notch together form a parallel plate channel.

6. The battery module according to claim 3, characterized in that: The parallel plate includes multiple connecting plates, each connecting plate having parallel holes. The multiple connecting plates are connected by connecting strips, and each connecting plate is connected to at least two connecting strips.

7. The battery module according to claim 6, characterized in that: At least one connection piece is connected to a sampling piece.

8. The battery module according to claim 3, characterized in that: Two adjacent battery rows are arranged side by side or staggered.

9. A battery pack, characterized in that: The device includes a housing containing a battery pack. A connector is provided on the housing, and the positive and negative terminals of the battery pack are connected to the connector. The battery pack includes at least one battery module as described in any one of claims 3-8. A main positive connector and a main negative connector are respectively connected to both ends of the battery module. When there are multiple battery modules, the multiple battery modules are connected in series.

10. The battery pack according to claim 9, characterized in that: It also includes a BMS device, which is located inside the housing, and the main positive connection piece and the main negative connection piece of each battery module are connected to the BMS device.

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