Detachable battery pack

Abstract

The utility model relates to a detachable battery pack which comprises a plurality of battery cells arranged in a bracket and a BMS (Battery Management System) mainboard connected to the bracket, the end part of the battery cell is connected with a detachable busbar; a plurality of battery cell connecting parts connected with the battery cells are arranged on a substrate of the busbar; and a tap of the busbar is detachably connected with the BMS main board. According to the utility model, the busbar is detachably connected with the battery cells, so that the battery cells can be effectively detached, a single battery cell can be conveniently maintained and replaced, and the maintenance cost is reduced; and meanwhile, by improving the structure of the busbar, the connection structure of the busbar and the battery cell is optimized, and the stability of electric connection is ensured while detachable connection is realized.

Description

Technical Field

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

[0002] There is no technology for detachable battery packs on the market. The main difficulty lies in the connection between the battery cell and the busbar. Currently, the connection between the battery cell and the busbar is mainly through resistance welding and laser welding. After welding, the battery cell and the busbar cannot be disassembled. If a single battery cell has a problem, it cannot be replaced and the entire battery pack needs to be scrapped, which has a high scrapping cost.

[0003] The EU has issued new battery regulations. For environmental protection, batteries must be removable, replaceable, and reusable. By 2027, all power batteries entering the European market must be removable and any part must be replaceable. Currently, there is no fully removable battery pack design on the market, and relevant technologies are urgently needed to cope with the new EU battery regulations. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the utility model provides a detachable battery pack.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0008] A detachable battery pack comprises a plurality of battery cells arranged in a bracket and a BMS mainboard connected to the bracket; the ends of the battery cells are connected to a detachable bus; a substrate of the bus is provided with a plurality of battery cell connection parts connected to the battery cells; the taps of the bus are detachably connected to the BMS mainboard.

[0009] Furthermore, the battery cell connection part is connected to the substrate via a connection arm; a slot is provided between the battery cell connection part and the substrate; and the battery cell connection part is detachably connected to the battery cell via a magnet provided thereon.

[0010] Furthermore, a recessed groove for accommodating a magnet is provided in the middle of the battery core connecting portion; and an outer surface of the recessed groove is a connecting surface that fits the end of the battery core.

[0011] Furthermore, a separation bus is detachably connected to the substrate; and a battery cell connection portion is formed on the separation bus.

[0012] Furthermore, the substrate is provided with slots for accommodating the separation bus; the separation bus is detachably connected to the substrate via screws; and the cell connection portions on the separation bus are welded to the cell ends.

[0013] Furthermore, a spring is fixedly connected to the substrate; the spring is a cell connection portion connected to the cell; a side of the substrate close to the cell is raised to form a bump; and the spring is sleeved on the bump.

[0014] Furthermore, a side of the substrate close to the battery cell is raised to form a battery cell connecting portion.

[0015] Furthermore, a pressing plate fixedly connected to the bracket is provided on the outer side of the base plate.

[0016] Furthermore, the pressing plate is provided with a pressing protrusion which cooperates with the battery cell connecting portion.

[0017] Furthermore, a positioning hole is provided on the substrate; a positioning column cooperating with the positioning hole is provided on the bracket; a bending portion is provided between the substrate and the tap; a connecting terminal is fixedly provided on the BMS mainboard; and the tap is detachably connected to the connecting terminal by a screw.

[0018] (III) Beneficial effects

[0019] The beneficial effects of the utility model are as follows: through the detachable connection between the bus and the battery cell, the battery cell is effectively detachable, which facilitates the repair and replacement of a single battery cell and reduces the repair cost; at the same time, through the improvement of the bus structure, the connection structure with the battery cell is optimized, and the stability of the electrical connection is guaranteed while achieving detachable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is an exploded view of the first embodiment of the battery pack of the utility model;

[0022] Figure 2 It is an enlarged view of the A part of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the battery cell connection portion of the first embodiment of the battery pack of the utility model;

[0024] Figure 4 This is an exploded view of the second embodiment of the battery pack of the utility model;

[0025] Figure 5 This is a schematic diagram of the busbar structure of the second embodiment of the battery pack of the utility model;

[0026] Figure 6 This is a schematic diagram of the separation bus structure of the second embodiment of the battery pack of the utility model;

[0027] Figure 7 This is an exploded view of the third embodiment of the battery pack of the utility model;

[0028] Figure 8 This is a schematic diagram of the busbar structure of the third embodiment of the battery pack of the utility model;

[0029] Fig. 9 This is a cross-sectional view of the busbar of the third embodiment of the battery pack of the utility model;

[0030] Fig.10 This is an exploded view of the fourth embodiment of the battery pack of the utility model;

[0031] Fig.11 This is a schematic diagram of the structure of the battery pack pressure plate of the utility model;

[0032] Description of reference numerals:

[0033] 110. Bracket; 111. Positioning column; 120. Battery cell; 130. BMS mainboard; 131. Connecting terminal; 132. Plug-in connector; 140. Screw; 150. Bus; 151. Tap; 152. Base plate; 1521. Separation bus; 1522. Bump; 153. Battery cell connecting part; 1531. Spring; 154. Bending part; 155. Positioning hole; 156. Slot hole; 157. Sink; 1571. Magnet; 158. Connecting arm; 159. Connecting surface; 160. Pressing plate; 161. Pressing protrusion. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example 1, please refer to Figure 1-3 As shown:

[0038] A detachable battery pack includes a bracket 110 and a battery cell 120 arranged therein. The bracket 110 usually adopts an upper and lower bracket 110 to cooperate with each other to wrap the battery cell 120. The upper and lower brackets 110 are locked by screws 140 to achieve detachability, which is a common method in the field; a BMS mainboard 130 is fixedly connected to the bracket 110 by screws 140, which facilitates the disassembly, installation or replacement of the BMS mainboard 130. The BMS mainboard 130 is provided with a connecting terminal 131 for detachably connecting with a busbar 150; the connecting terminal 131 is usually directly welded to the BMS mainboard 130, and a threaded hole is provided on the connecting terminal 131. The busbar 150 is connected to the connecting terminal 131 by screws 140. A through hole is provided on the tap 151 on 150, and the screw 140 passes through the through hole and cooperates with the threaded hole on the connecting terminal 131 to fix the tap 151 on the connecting terminal 131, so as to realize a detachable connection and facilitate the replacement of the bus 150; a cell connecting portion 153 connected to the cell 120 is provided on the bus 150; a recessed groove 157 is formed inwardly on the cell connecting portion 153, and a magnet 1571 is provided in the recessed groove 157, and the magnet 1571 is adsorbed on the end of the cell 120, so that the cell connecting portion 153 is stably connected to the cell 120, and the magnetic connection can also realize the detachable connection of the bus 150;

[0039] In one embodiment, the cell connection portion 153 is connected to the substrate 152 of the bus 150 through the connecting arm 158. A slot 156 is provided between the cell connection portion 153 and the substrate 152, so that the cell connection portion 153 can move away from the plane where the substrate 152 is located. Since the sinking groove 157 is concave toward the direction of the cell 120, the outer surface of the sinking groove 157 is the connection surface 159 connected to the cell 120. When the bus 150 is installed, the connection surface 159 first contacts the cell 120. 20. When the busbar 150 is installed as close to the battery cell 120 as possible, the battery cell connection portion 153 will be squeezed and elastically deformed under the action of the connecting arm 158. The battery cell connection portion 153 is tightly attached to the end of the battery cell 120 by the resilience of the connecting arm 158, thereby improving the connection stability; the inner surface of the sink 157 cooperates with the magnet 1571, and the magnet 1571 is attached to the sink 157 or clamped in the sink 157 by means of adhesive, and the model of the magnet 1571 is high magnetic N52;

[0040] In one embodiment, a bending portion 154 is provided between the substrate 152 and the tap 151. The bending portion 154 can effectively increase the service life of the bus 150. Since the bus 150 of the battery pack of the utility model is configured as a detachable structure, when the bus 150 undergoes multiple disassembly and assembly and normal use vibration, it is easy for stress concentration to occur in the case of falling and vibration, causing the nickel strip to break. By adding the bending portion 154, the elastic range of the nickel strip can be effectively increased, the occurrence of breakage can be reduced, and a buffering effect can be played.

[0041] In one embodiment, a pressing plate 160 fixedly connected to the bracket 110 is provided on the outer side of the substrate 152; the pressing plate 160 is fixed to the bracket 110 by screws 140; after the busbar 150 and the battery cell 120 are fixed by adsorption by the magnet 1571, the outer side is pressed by the pressing plate 160, and each battery cell 120 is evenly stressed, ensuring that the busbar 150 and the battery cell 120 are well matched;

[0042] In one embodiment, the bracket 110 is provided with a positioning post 111 , and the base plate 152 is provided with a positioning hole 155 that cooperates with the positioning post 111 , so as to facilitate rapid positioning of the busbar 150 during installation.

[0043] In one embodiment, all wiring harness connections on the BMS mainboard 130 use plug-in connectors, and when disassembling, just unplug the terminals; all brackets 110 and the outer shell are fixed with screws 140, and when disassembling, just remove the screws 140.

[0044] Embodiment 2, as Figure 4-6 As shown:

[0045] The difference from the previous embodiment lies in the structural difference of the busbar 150. In this embodiment, a separation busbar 1521 is detachably connected to the busbar 150; the battery cell connection portion 153 is arranged on the separation busbar 1521; a slot 156 for accommodating the separation busbar 1521 is arranged on the substrate 152, and the separation busbar 1521 is detachably connected to the substrate 152 by screws 140. Specifically, an extension plate is arranged on the separation busbar 1521, and the extension plate is fixedly connected to the busbar 150 by screws 140; the tap 151 of the busbar 150 is detachably connected to the connection terminal 131 by screws 140; the separation busbar 1521 can be fixed to the battery cell 120 by welding, and only the busbar 150 needs to be disassembled during disassembly, and the maintenance and replacement of a single battery cell 120 can also be realized;

[0046] In this embodiment, since a separated busbar 1521 with a split structure is used, the battery cell connection portion 153 can be directly welded to the battery cell 120, so the pressure plate 160 can only serve as a decorative part, and there is no need to further press the busbar onto the battery cell 120, thereby improving the stability of the connection.

[0047] Embodiment three, as Figure 7-9 As shown:

[0048] Compared with the first embodiment, the difference of this embodiment lies in the detachable connection structure between the busbar 150 and the battery cell 120. In this embodiment, a spring 1531 is fixedly connected to the substrate 152, and the spring 1531 is tightly fixed to the busbar 150. Each battery cell 120 corresponds to a spring 1531. The conductivity and deformation of the spring 1531 are used to ensure the conductivity of the battery cell 120 and the busbar 150. The spring 1531 is a battery cell connecting portion 153 connected to the battery cell 120; the tap 151 is fixedly connected to the connecting terminal 131 by a screw 140 to squeeze the spring 1531, so that the spring 1531 and the battery cell 120 are closely fitted to ensure conductivity; but since the tap 151 is usually arranged on one side of the busbar 150, the unilateral fixation has a poor squeezing effect on the spring 1531. Preferably, a plurality of connection holes can be arranged on the busbar 150 to be fixed to the bracket 110 by screws 140, so as to more stably squeeze the spring 1531 and improve the stability and effectiveness of the connection;

[0049] In one embodiment, a pressure plate 160 is additionally installed outside the busbar 150 to ensure good contact between the busbar 150 and the battery cell 120 and ensure that each battery cell 120 is evenly stressed. The pressure plate 160 is fixedly connected to the bracket 110 by screws 140, and the spring 1531 is always in a compressed state.

[0050] In one embodiment, a protrusion 1522 is formed on one side of the substrate 152 close to the battery cell 120, and a spring 1531 is sleeved on the protrusion 1522. The protrusion 1522 is circular in shape, and the spring 1531 is tightly sleeved on the protrusion 1522. In another embodiment, the spring 1531 can be welded to the bus 150, and a detachable connection between the bus 150 and the battery cell 120 can also be achieved.

[0051] Embodiment 4, as Figure 10-11 As shown:

[0052] Compared with the third embodiment, the difference of this embodiment lies in the detachable connection structure between the busbar 150 and the battery cell 120. In this example, a protrusion on one side of the substrate 152 close to the battery cell 120 forms a battery cell connection portion 153; in this embodiment, the tap 151 is fixed on the connection terminal 131 to achieve the abutment between the battery cell connection portion 153 and the battery cell 120. Although the detachable connection between the busbar 150 and the battery cell 120 can be achieved, which is convenient for the maintenance and replacement of a single battery cell 120, the stability is not strong; preferably, a pressing plate 160 fixedly connected to the bracket 110 is provided on the outer side of the substrate 152, and the stability of the connection between the busbar 150 and the battery cell 120 is improved by pressing the busbar 150 with the pressing plate 160;

[0053] In one embodiment, the pressing plate 160 is provided with a pressing protrusion 161 that cooperates with the battery cell connecting portion 153 ; by accurately cooperating with the battery cell connecting portion 153 , the stability of the connection can be better ensured.

[0054] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A detachable battery pack, characterized in that: The invention comprises a plurality of battery cells (120) arranged in a bracket (110) and a BMS mainboard (130) connected to the bracket (110); the ends of the battery cells (120) are connected to a detachable busbar (150); a substrate (152) of the busbar (150) is provided with a plurality of battery cell connection parts (153) connected to the battery cells (120); and the tap (151) of the busbar (150) is detachably connected to the BMS mainboard (130).

2. A detachable battery pack according to claim 1, characterized in that: The battery core connection part (153) is connected to the base plate (152) via a connection arm (158); a slot hole (156) is provided between the battery core connection part (153) and the base plate (152); and the battery core connection part (153) is detachably connected to the battery core (120) via a magnet (1571) provided thereon.

3. A detachable battery pack according to claim 2, characterized in that: A recessed groove (157) for accommodating a magnet (1571) is provided in the middle of the battery core connecting portion (153); the outer surface of the recessed groove (157) is a connecting surface (159) that fits the end of the battery core (120).

4. A detachable battery pack according to claim 1, characterized in that: A separation busbar (1521) is detachably connected to the substrate (152); and a cell connection portion (153) is formed on the separation busbar (1521).

5. A detachable battery pack according to claim 4, characterized in that: The base plate (152) is provided with a slot (156) for accommodating a separation bus (1521); the separation bus (1521) is detachably connected to the base plate (152) via a screw (140); and the cell connection portion (153) on the separation bus (1521) is welded to the end of the cell (120).

6. A detachable battery pack according to claim 1, characterized in that: A spring (1531) is fixedly connected to the substrate (152); the spring (1531) is a cell connection portion (153) connected to the cell (120); a side of the substrate (152) close to the cell (120) is raised to form a convex block (1522); and the spring (1531) is sleeved on the convex block (1522).

7. A detachable battery pack according to claim 1, characterized in that: A side of the substrate (152) close to the battery cell (120) is raised to form a battery cell connecting portion (153).

8. A detachable battery pack according to any one of claims 1 to 7, characterized in that: A pressing plate (160) fixedly connected to the bracket (110) is provided on the outer side of the base plate (152).

9. A detachable battery pack according to claim 8, characterized in that: The pressing plate (160) is provided with a pressing protrusion (161) that matches the battery core connecting portion (153).

10. A detachable battery pack according to any one of claims 1 to 7, characterized in that: The base plate (152) is provided with a positioning hole (155); the bracket (110) is provided with a positioning column (111) matched with the positioning hole (155); a bending portion (154) is provided between the base plate (152) and the tap (151); a connecting terminal (131) is fixedly provided on the BMS main board (130); and the tap (151) is detachably connected to the connecting terminal (131) via a screw (140).

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