Battery pack and electric equipment

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a battery pack and electric equipment. Comprising a battery pack body, a plurality of single batteries which are connected in series or in parallel or in a combination of series connection and parallel connection, discharge wires, charging voltage sampling wires, copper sheets riveted at one end of each discharge wire and one end of each charging voltage sampling wire respectively, and copper wires riveted at the other end of each discharge wire and the other end of each charging voltage sampling wire respectively. The copper sheets on the discharge wires are in welded connection with electrodes of the battery pack body, and the copper sheets on the charging voltage sampling wires are in welded connection with electrodes of single batteries forming the battery pack body.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a battery pack and electric equipment. BACKGROUND

[0002] With the battery application more and more widely, especially the application of lithium ion battery, the equipment using lithium ion battery is also more and more, and the production efficiency and automation degree of lithium ion battery pack need to be improved.

[0003] The present inventor found that the assembly stability of the current lithium ion battery pack is poor during the research of the utility model. SUMMARY

[0004] One of the purposes of the utility model embodiment is to provide a battery and electric equipment, and the application of the technical scheme in the battery pack production can be beneficial to guarantee product quality and improve the production efficiency of the battery pack.

[0005] The utility model embodiment provides a battery pack, which comprises:

[0006] The battery pack body is composed of a plurality of battery monomers connected in series or in parallel or in a combination of series and parallel connection.

[0007] The discharge wire and the charging voltage sampling wire are respectively riveted with copper sheets at one end.

[0008] Optionally, each copper sheet comprises a riveting part and a copper sheet body connected integrally.

[0009] The end of each discharge wire and charging voltage sampling wire is respectively riveted in the through hole of the riveting part of the connected copper sheet, and each copper sheet body is tightly welded with the tab.

[0010] Optionally, the thickness and width of each copper sheet connected to the end of each discharge wire are greater than those of each copper sheet connected to the end of each charging voltage sampling wire.

[0011] Optionally, a bundling belt is further bundled on the lateral periphery of the battery pack body.

[0012] Optionally, it further comprises a protective sleeve wrapped around the bottom end and the side surface of the battery pack body, and the bundling belt is located in the protective sleeve.

[0013] Optionally, further comprising a cold injection block, which is solidified and formed on the top of the battery pack body, and the top of the battery pack body, the connection structure of each electrode and each discharge wire, and each charging voltage sampling wire are encapsulated in the cold injection block.

[0014] Optionally, the other end of each discharge wire is commonly connected with a power connector.

[0015] Optionally, the other end of each charging voltage sampling wire is commonly connected with a terminal.

[0016] In the second aspect, the utility model provides a kind of electric equipment, comprising, drive circuit, the power interface of the drive circuit is connected with the plug-in port of the front end of the plug group of any above-mentioned battery pack and is inserted and electrically connected

[0017] The technical scheme of the existing technology's soldering discharge wire and charging wire, the high temperature of the existing technology's soldering can be conducted to the battery cell to damage the electrolyte in the battery cell, and the existing technology can damage the energy of the battery cell.

[0018] Compared with the prior art, the end of each charging wire and charging voltage sampling wire is riveted with copper sheet in advance, and then the copper sheet is attached to the corresponding electrode sheet of the battery, and the heat diffusion to the inside of the battery cell is avoided by precision welding, to ensure product quality. And the battery pack structure using the embodiment is easy to realize by automatic equipment by adopting riveting, laser welding and other processes, which is beneficial to improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the utility model, constitute a part of this application, and do not constitute improper limitation to the utility model.

[0020] Figure 1 The assembly structure schematic diagram of the battery pack provided by the utility model embodiment is shown in the figure.

[0021] Figure 2 The semi-finished product structure schematic diagram of the battery pack body provided by the utility model embodiment is shown in the figure.

[0022] Figure 3 The connection structure schematic diagram of charging voltage sampling wire and copper sheet provided by the utility model embodiment is shown in the figure.

[0023] Figure 4 The structure schematic diagram of copper sheet connected by charging voltage sampling wire provided by the utility model embodiment is shown in the figure.

[0024] Figure 5 The connection structure schematic diagram of discharge wire and copper sheet provided by the utility model embodiment is shown in the figure.

[0025] Figure 6 Structure schematic diagram of copper sheet connected with discharging wire provided by the embodiment of the utility model respectively;

[0026] Figure 7 Structure schematic diagram of connection of battery pack body with discharging wire and charging voltage sampling wire provided by the embodiment of the utility model respectively

[0027] Figure 8 Structure schematic diagram of cold injection block of battery pack after forming provided by the embodiment of the utility model respectively.

[0028] 1: battery pack body;11: tab;12: battery monomer;

[0029] 2: discharging wire;

[0030] 3: charging voltage sampling wire;

[0031] 4: protective sleeve;5: binding tape;

[0032] 6: copper sheet;61: riveting part;62: copper sheet body;

[0033] 7: power connector;8: wiring terminal;9: cold injection block. DETAILED DESCRIPTION

[0034] The utility model will be combined with the specific embodiment and the drawing to explain the utility model in detail, the schematic embodiment of the utility model and the explanation for the utility model, but not as the limitation of the utility model. EMBODIMENT

[0035] Referring to Figures 1-8 As shown.

[0036] The embodiment provides a battery pack structure, which can be but not limited to lithium ion battery pack.It mainly includes battery pack body 1.

[0037] Among them, battery pack body 1 is at least two battery monomers 12 in series or parallel or the combination of series and parallel, with the tab 11 of battery pack body 1 as the electrode of battery, and the series-parallel scheme between specific battery monomers 12 can be but not limited to referring to prior art.

[0038] Each battery monomer 12 is arranged together, each tab 11 is located at one end of battery pack body 1, the end where tab 11 is located is top end, the end opposite to top end is bottom end, and each surface between top end and bottom end is side surface.

[0039] For the convenience of assembly, a plurality of battery monomers 12 can be but not limited to bound together.

[0040] The discharge wire 2 and the charging voltage sampling wire 3 are connected to the top of the battery pack body 1, wherein the center of the discharge wire 2 and the charging voltage sampling wire 3 is a wire core, and the outer periphery is covered with an insulating rubber layer. A section of the wire core at the end of each discharge wire 2 and each charging voltage sampling wire 3 connected to the battery pack body 1 is exposed, and a copper sheet 6 is pre-riveted at the end of each exposed wire core, respectively. When connecting each discharge wire 2 and each charging voltage sampling wire 3 to each tab 11 of the battery pack body 1, specifically, each copper sheet 6 is electrically connected to each tab 11 by laser welding or spot welding or ultrasonic welding or other precise and efficient welding process. Among them, but not limited to, each copper sheet 6 is placed face to face with the corresponding tab (or the metal sheet attached to the tab), and the welding between each discharge wire 2 and each charging voltage sampling wire 3 and the tab 11 of the battery pack body 1 is realized by precise and efficient welding process such as laser welding or spot welding or ultrasonic welding.

[0041] The existing technology of soldering the discharge wire 2 with a soldering iron and the technical solution of the discharge wire 2, the high temperature of the existing technology of soldering with a soldering iron will be conducted to the battery cell, which will damage the electrolyte in the battery cell, and the existing technology will damage the battery cell. Compared with the prior art, the present embodiment pre-rivets a copper sheet 6 at the end of each discharge wire 2 and charging voltage sampling wire 3, and then the copper sheet 6 is attached to the corresponding tab of the battery, and the heat is prevented from spreading to the inside of the battery cell by precise welding, which ensures the product quality. The battery pack structure of the present embodiment is easy to realize by automatic equipment through riveting, laser welding and other processes, which is conducive to improving the production efficiency.

[0042] As an example of the present embodiment, each copper sheet 6 of the present embodiment includes a riveting part 61 and a copper sheet body 62, which are preferably integrally formed. The riveting part 61 is a part that can be deformed by riveting, which is used to rivet the exposed wire core at the end of each discharge (or charging voltage sampling wire 3) connected thereto, such as but not limited to placing the exposed wire core on the top surface of the original riveting part 61, and a bent edge is further provided on both sides of the original riveting part 61. The edge is tightly clamped on the exposed wire core by a riveting machine, and the riveting part 61 obtained after riveting tightly fastens and wraps the exposed core in the through hole of the riveting part 61. Each flat copper sheet body 62 is used as an external electrical connection component of each discharge (or charging voltage sampling wire 3), and is tightly welded to each tab 11 corresponding thereto.

[0043] Among them, each copper sheet body 62 at the end of the discharge wire 2 is tightly welded to the positive “+” and negative “-” tabs 11 of the battery pack body 1.

[0044] The copper sheet bodies 62 at the ends of the charging voltage sampling lines 3 are respectively welded to the tabs 11 of the battery cells 12 in the battery pack body 1, so as to sample the voltage of each battery cell 12 and charge each battery cell 12 respectively. For example, but not limited to, a balanced charging technology is adopted, that is, the voltage of each battery cell 12 is sampled in real time, and each battery cell 12 is balanced charged according to the sampling voltage, so that the electric quantity of each battery cell 12 is evenly distributed. For further balanced charging technology, please refer to the prior art.

[0045] As an example of the present embodiment, the thickness and width of each copper sheet 6 (including rivet part and copper sheet body 62) connected at the end of each discharge line 2 are greater than the thickness and width of each copper sheet 6 (including rivet part and copper sheet body 62) connected at the end of each charging voltage sampling line 3. In order to reduce the discharge resistance of the discharge end, reduce the heat generation of the discharge end, and reduce the output heat loss.

[0046] As an example of the present embodiment, the battery pack of the present embodiment adopts a soft package structure, and a protective sleeve 4 is further wrapped around the bottom end and the side surface of the battery pack body 1. The top end of the battery pack body 1 is reserved for welding the tabs 11 and electrically connecting the discharge lines 2 and the charging voltage sampling lines 3. The binding tape 5 (if any) is wrapped in the protective sleeve 4. The technical scheme is advantageous to protect the outer layer of the battery pack, and improve the appearance consistency and aesthetic degree of the battery pack body 1.

[0047] As an example of the present embodiment, after the electrical connection between the battery body and the discharge line 2 and the charging voltage sampling line 3 is completed, a cold injection molding process is further adopted to form a cold injection molding block 9 on the top and the upper part of the side of the battery pack body 1. The top end of the battery body and the circuit connection structure (including but not limited to the tabs 11 and the connection structure of the tabs 11 and the discharge lines 2 and the charging voltage sampling lines 3) thereon are packaged in the cold injection molding block 9. The lower end of the cold injection molding part is integrated with the protective sleeve 4 wrapped around the upper end of the side of the battery pack body 1, and the appearance of the battery pack has good consistency. The cold injection molding process of the technical scheme of the present embodiment can be automatically produced, which can greatly improve the production efficiency and improve the connection fastness and reliability between the tabs 11 and the discharge lines 2 and the charging voltage sampling lines 3. The product quality is improved.

[0048] As an example of the present embodiment, a power connector 7 is connected at the other end of each discharge line 2, so as to be connected with another power connector 7 of an external electric device.

[0049] Similarly, a terminal 8 is connected at the other end of each charging voltage sampling line 3 as a balanced charging connector, which is connected with a charger.

[0050] The above-described embodiments do not constitute a limitation on the protection scope of the technical solutions. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solutions.

Claims

1. A battery pack characterized by, The battery pack comprises: a battery pack body, a plurality of battery cells connected in series or in parallel or in a combination of series and parallel connection, and the end where the electrode is located is the top end, a discharge wire and a charging voltage sampling wire, a copper sheet is riveted at one end of each of the discharge wire and the charging voltage sampling wire, the copper sheet on each of the discharge wire is welded to the electrode of the battery pack body, and the copper sheet on each of the charging voltage sampling wire is welded to the electrode of the battery cell constituting the battery pack body.

2. The battery pack according to claim 1, wherein each of the copper sheets comprises a riveting part and a copper sheet body connected integrally, the end of each of the discharge wire and the charging voltage sampling wire is riveted in the through hole of the riveting part of the copper sheet connected thereto, and each of the copper sheet bodies is tightly welded to the tab connected thereto.

3. The battery pack according to claim 2, wherein the thickness and width of each of the copper sheets connected to the end of the discharge wire are greater than those of each of the copper sheets connected to the end of the charging voltage sampling wire.

4. The battery pack according to claim 1, wherein a bundling tape is further bundled around the lateral periphery of the battery pack body.

5. The battery pack according to claim 4, further comprising a protective sleeve wrapped around the bottom end of the battery pack body and the side surface of the protective sleeve, and the bundling tape is located in the protective sleeve.

6. The battery pack according to claim 5, further comprising a cold injection molding block solidified and formed on the top of the battery pack body, and the connection structure of the top of the battery body, the electrodes, the discharge wires and the charging voltage sampling wires are packaged in the cold injection molding block.

7. The battery pack according to claim 1, wherein the other end of each of the discharge wires is commonly connected to a power connector.

8. The battery pack according to claim 1, wherein the other end of each of the charging voltage sampling wires is commonly connected to a terminal.

9. An electrically powered device, characterised in that, The battery pack further comprises a driving circuit, and the power interface of the driving circuit is electrically connected to the discharge wire of the battery pack according to any one of claims 1 to 8.

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