Storage battery device

Abstract

The invention relates to a storage battery device, which comprises a shell and a battery pack accommodated in the shell, the battery pack is formed by stacking a plurality of soft package battery monomers, the end part of each soft package battery monomer is provided with a tab, and a plurality of tabs are arranged along the stacking direction to form a tab group; the storage battery device further comprises a connecting element connected with the tab group, the connecting element penetrates through the tab group and connects the plurality of soft package battery monomers in series, the connecting element is provided with a conductive part and an insulating part connected to the conductive part, and the tabs are arranged in the area where the conductive part is located in a sleeved mode. According to the invention, the two connecting elements are in interference connection with the tabs, so that the soft package battery monomers are connected in series, and stable and reliable connection can be realized without complicated operations such as welding; and the connecting element is formed by embedding / assembling the conductive part and the insulating part, so that the assembly process is simple.

Description

[Technical field]

[0001] The present invention relates to a battery device, in particular to a battery device for providing electric energy to equipment. [Background technology]

[0002] Based on the demand for portability, more and more devices are currently using battery packs as a power source.

[0003] At present, batteries mainly have three structures: cylindrical, square, and soft pack. Existing battery packs used to power devices mostly use cylindrical lithium batteries, and multiple cylindrical lithium batteries are connected in series and parallel to ensure sufficient power output to improve the endurance of the device. However, the process of cylindrical lithium batteries is complicated and the positive and negative electrodes are placed at both ends, which is extremely unfavorable for the wiring harness layout and overall design of the battery device. In addition, there are very large electrical safety hazards because the shell material is steel.

[0004] In addition, the battery pack composed of square aluminum shell batteries is large in size and heavy in weight, and the space utilization rate is low compared to the battery device with fixed size requirements, which is not conducive to the expansion of battery capacity and the overall design of the system; and the current new energy power battery industry will develop in the direction of high energy density, so the assembly of soft-pack battery cells into battery devices will become the future development trend of power batteries.

[0005] For the description of the above structure, please refer to U.S. invention patent No. US20240014516A1 published on January 11, 2024, which discloses a battery pack including a plurality of battery cells with tabs and a tab connecting element. The receiving part and the fixing part of the tab connecting element connect the plurality of battery cells. However, the tab connecting element requires a large number of welding operations during the actual assembly process, which is not conducive to simple and reliable contact and conduction of the battery cells.

[0006] In view of this, it is indeed necessary to provide an improved battery device to overcome the defects of the prior art. [Summary of the invention]

[0007] In view of the shortcomings of the prior art, an object of the present invention is to provide a simple and reliably conductive battery device.

[0008] The present invention solves the problems of the prior art by adopting the following technical solutions: a battery device, comprising a shell and a battery pack accommodated in the shell, wherein the battery pack is formed by stacking a plurality of soft-pack battery cells, and a pole lug is provided at the end of each of the soft-pack battery cells, and a plurality of the pole lugs are arranged along the stacking direction to form a pole lug group; the battery device also includes a connecting element connecting the pole lug group, the connecting element is inserted into the pole lug group and connects a plurality of the soft-pack battery cells in series, the connecting element has a conductive part and an insulating part connected to the conductive part, and the pole lug is sleeved in the area where the conductive part is located.

[0009] A further improvement is that the connecting element is injection molded or assembled in parts.

[0010] A further improved solution is that in the up-down direction of the battery device, the length of the connecting element is greater than the maximum distance between any two of the tabs.

[0011] A further improvement scheme is: the soft-pack battery cell has a core, an aluminum-plastic film covering the core, a positive contact ear and a negative contact ear connected to the core, a positive contact hole passing through the positive contact ear and a negative contact hole passing through the negative contact ear, and the inner diameters of the positive contact hole and the negative contact hole are smaller than the outer diameter of the conductive part.

[0012] A further improved solution is: the battery pack has a first soft-pack battery cell and a second soft-pack battery cell, the positive contact tab of the first soft-pack battery cell is aligned with the negative contact tab of the second soft-pack battery cell, and the negative contact tab of the first soft-pack battery cell is aligned with the positive contact tab of the second soft-pack battery cell.

[0013] A further improved solution is: the connecting element has a first connecting element and a second connecting element, the first connecting element has a first conductive portion passing through the positive contact hole of the first soft-pack battery cell, a second conductive portion passing through the negative contact hole of the second soft-pack battery cell, and a first insulating portion connected between the first conductive portion and the second conductive portion, the first insulating portion is located between the positive contact tab of the first soft-pack battery cell and the negative contact tab of the second soft-pack battery cell; the second connecting element has a third conductive portion passing through the negative contact hole of the first soft-pack battery cell and the positive contact hole of the second soft-pack battery cell, and a second insulating portion and a third insulating portion respectively connected to ends of the third conductive portion, the second insulating portion is located on the upper side of the negative contact tab of the first soft-pack battery cell, and the third insulating portion is located on the lower side of the positive contact tab of the second soft-pack battery cell.

[0014] A further improved solution is: the battery device further includes a retaining bracket for fixing the soft-pack battery cell and a supporting member connected to the retaining bracket, wherein the supporting member supports the tab.

[0015] A further improved solution is: the support member has a support plate parallel to the extension direction of the soft-pack battery cell and a slot penetrating the support plate, the inner diameter of the slot is larger than the outer diameter of the connecting element, and the connecting element is inserted into the slot.

[0016] A further improved solution is that in the extension direction of the connecting element, the support plate and the pole lug are arranged at intervals.

[0017] A further improved solution is that the first conductive part and the third conductive part are respectively connected to the current loop of the battery device via conductors.

[0018] The present invention also adopts the following technical solution to solve the problems of the prior art: a battery device includes a shell and a battery pack accommodated in the shell, the battery pack includes a first soft-pack battery cell and a second soft-pack battery cell that are stacked; the battery device also includes a first connecting element and a second connecting element connected to the battery pack, the insulating portion of the first connecting element electrically isolates the positive contact tab of the first soft-pack battery cell from the negative contact tab of the second soft-pack battery cell, the conductive portion of the second connecting element penetrates the negative contact tab of the first soft-pack battery cell and the positive contact tab of the second soft-pack battery cell, and connects the first soft-pack battery cell and the second soft-pack battery cell in series.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the interference fit between the two connecting elements and the tabs allows the soft-pack battery cells to be connected in series, and a stable and reliable connection can be achieved without the need for complex operations such as welding; and the connecting elements are formed by inserts / assemblies of conductive parts and insulating parts, and the assembly process is simple.

Brief Description of the Drawings

[0020] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the battery device of the present invention;

[0022] Figure 2 yes Figure 1 A disassembled view of the battery unit shown;

[0023] Figure 3 yes Figure 2 A schematic diagram of the structure of a battery pack in the battery device shown;

[0024] Figure 4yes Figure 3 A partial enlarged view of the battery pack shown;

[0025] Figure 5 yes Figure 3 The schematic diagram of the structure of the battery pack installation connection element shown;

[0026] Figure 6 yes Figure 2 The schematic diagram of the structure of the battery device shown in the figure without the shell;

[0027] Figure 7 yes Figure 5 A schematic diagram of the current path of the battery pack shown;

[0028] Figure 8 yes Figure 5 A schematic diagram of the disassembly of the connecting element shown;

[0029] Fig. 9 yes Figure 2 A schematic structural diagram of a support member in the battery device shown;

[0030] Fig.10 It is a schematic structural diagram of another holding bracket in the battery device of the present invention. [Specific implementation method]

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0032] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words indicating orientation or positional relationship, such as "upper", "lower", "front", "back", "left", "right", etc., are based on the orientation or positional relationship 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 / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0033] See also Figure 1 and Figure 2 As shown, the embodiment of the present invention relates to a battery device 100, whose voltage is generally 12V, 24V, 36V, 48V, 56V or 80V. In order to facilitate the description of the technical solution of the present invention, the following definitions are made: Figure 1 The front side, the rear side, the left side, the right side, the top side and the bottom side are shown. The battery device 100 includes a housing 1 and a battery pack 2 accommodated in the housing 1 .

[0034] Wherein, the shell 1 includes an upper shell 11 and a lower shell 12 assembled at the interface to form an inner cavity. The shell 1 is composed of a first material, specifically, the first material is a thermoplastic material, such as polyethylene plastic, polyvinyl chloride plastic, etc. The shell 1 is assembled by the upper shell 11 and the lower shell 12 to form an inner cavity to accommodate the battery pack 2. The shell 1 is at least partially formed with a coupling portion 13 for connecting the battery device 100 to the power tool, and the battery device 100 can be connected to the power tool in the front-to-back direction. Specifically, a coupling portion 13 is formed on the upper surface of the shell 1, and the coupling portion 13 can match with the adapter portion of the power tool so that the battery device 100 can be detachably attached to the power tool along the installation direction. In some embodiments, the coupling portion 13 is provided with a pair of guide rails.

[0035] In this embodiment, the battery pack 2 is disposed in the inner cavity formed by the housing 1. The battery pack 2 includes a plurality of soft-pack battery cells, which are connected in series, in parallel, or in series and parallel to form the battery pack 2. In some embodiments, the voltage of a single soft-pack battery cell is 4.2V.

[0036] The energy density of the battery pack 2 has a value range of greater than 150Wh / kg. Optionally, the energy density of the battery pack 2 has a value range of 150Wh / kg to 200Wh / kg. Optionally, the energy density of the battery pack 2 has a value range of greater than 200Wh / kg.

[0037] In some embodiments, the internal resistance of the battery device 100 is less than or equal to 10 mΩ. Optionally, the internal resistance of the battery device 100 is less than or equal to 6 mΩ. Optionally, the internal resistance of the battery device 100 is less than or equal to 3 mΩ.

[0038] In some embodiments, the discharge current of the battery device 100 is greater than or equal to 20A. Optionally, the discharge current of the battery device 100 is greater than or equal to 40A. Optionally, the discharge current of the battery device 100 is greater than or equal to 60A. Optionally, the discharge current of the battery device 100 is greater than or equal to 80A. Optionally, the discharge current of the battery device 100 is greater than or equal to 100A. Optionally, the discharge current of the battery device 100 is greater than or equal to 120A.

[0039] Specifically, the soft-pack battery cell is in a flat bag-shaped structure, and a plurality of soft-pack battery cells are stacked and arranged in sequence along the up-down direction. In some embodiments, the soft-pack battery cell can also be bent into an arc shape.

[0040] Combination Figure 3 and Figure 4As shown, the battery pack 2 in this embodiment is composed of five soft-pack battery cells, namely a first soft-pack battery cell 21, a second soft-pack battery cell 22, a third soft-pack battery cell 23, a fourth soft-pack battery cell 24 and a fifth soft-pack battery cell 25, and the above soft-pack battery cells have the same shape and structure.

[0041] Among them, taking the first soft-pack battery cell 21 as an example, it has a core body 211 that is roughly flat and square, an aluminum-plastic film 212 covering the core body 211, a first positive contact tab 213 and a first negative contact tab 214 connected to the core body 211 and protruding outside the aluminum-plastic film 212, a first positive contact hole 215 penetrating the first positive contact tab 213, and a first negative contact hole 216 penetrating the first negative contact tab 214. The first positive contact tab 213 and the first negative contact tab 214 are located at the end of the first soft-pack battery cell 21. In some embodiments, the tabs are mainly composed of the first positive contact tab 213 and the first negative contact tab 214. In some embodiments, the first positive contact tab 213 and the first negative contact tab 214 are distributed on the same side of the battery device 100. Optionally, the first positive contact tab 213 and the first negative contact tab 214 are located on the front side of the battery device 100. Optionally, the first positive contact tab 213 and the first negative contact tab 214 are located at the rear side of the battery device 100. In some embodiments, the first positive contact tab 213 and the first negative contact tab 214 are distributed on opposite sides of the battery device 100. Optionally, the first positive contact tab 213 is located at the front side of the battery device 100, and the first negative contact tab 214 is located at the rear side of the battery device 100. Optionally, the first positive contact tab 213 is located at the rear side of the battery device 100, and the first negative contact tab 214 is located at the front side of the battery device 100.

[0042] In this embodiment, the second soft-pack battery cell 22, the third soft-pack battery cell 23, the fourth soft-pack battery cell 24 and the fifth soft-pack battery cell 25 also have the above-mentioned core, aluminum-plastic film, positive contact tab, negative contact tab, positive contact hole and negative contact hole.

[0043] Among them, the second soft-pack battery cell 22 has a core, an aluminum-plastic film, a second positive contact ear 223, a second negative contact ear 224, a second positive contact hole 225 and a second negative contact hole 226; the third soft-pack battery cell 23 has a core, an aluminum-plastic film, a third positive contact ear 233, a third negative contact ear 234, a third positive contact hole 235 and a third negative contact hole 236; the fourth soft-pack battery cell 24 has a core, an aluminum-plastic film, a fourth positive contact ear 243, a fourth negative contact ear 244, a fourth positive contact hole 245 and a fourth negative contact hole 246; the fifth soft-pack battery cell 25 has a core, an aluminum-plastic film, a fifth positive contact ear 253, a fifth negative contact ear 254, a fifth positive contact hole 255 and a fifth negative contact hole 256.

[0044] Figure 4 The multiple soft-pack battery cells in the battery pack 2 shown are arranged in a flipped stack, that is, the second soft-pack battery cell 22 and the fourth soft-pack battery cell 24 are arranged by flipping the first soft-pack battery cell 21 by 180°, and the third soft-pack battery cell 23 and the fifth soft-pack battery cell 25 are replicas of the first soft-pack battery cell 21.

[0045] Specifically, ten pole tabs are arranged along the stacking direction to form a first pole tab group 2a and a second pole tab group 2b respectively. The first pole tab group 2a is mainly composed of a first positive contact pole tab 213, a second negative contact pole tab 224, a third positive contact pole tab 233, a fourth negative contact pole tab 244 and a fifth positive contact pole tab 253, and the multiple pole tabs in the first pole tab group 2a are aligned; the second pole tab group 2b is mainly composed of a first negative contact pole tab 214, a second positive contact pole tab 223, a third negative contact pole tab 234, a fourth positive contact pole tab 243 and a fifth negative contact pole tab 254, and the multiple pole tabs in the second pole tab group 2a are aligned.

[0046] Combination Figure 5 As shown, the battery device 100 further includes a connecting element 5 for connecting the tab groups, wherein the connecting element 5 includes a first connecting element 5a for connecting the first tab group 2a and a second connecting element 5b for connecting the second tab group 2b. The first tab group 2a is provided in the first tab group 2a, and the second tab group 2b is provided in the second connecting element 5b, thereby connecting five soft-pack battery cells in series. Specifically, the first connecting element 5a passes through the first positive contact hole 215, the second negative contact hole 226, the third positive contact hole 235, the fourth negative contact hole 246, and the fifth positive contact hole 255; the second connecting element 5b passes through the first negative contact hole 216, the second positive contact hole 225, the third negative contact hole 236, the fourth positive contact hole 245, and the fifth negative contact hole 256. In some embodiments, the connecting element 5 and the contact hole are both interference fit, that is, the outer diameter of the connecting element 5 is larger than the inner diameter of the contact hole, thereby preventing the tabs from moving and slipping, and avoiding the risk of short circuit of the battery pack 2.

[0047] Optionally, the connecting element 5 is integrally injection molded. Optionally, the connecting element 5 is split.

[0048] Combination Figure 8 As shown, the connecting element 5 comprises a conductive portion 51 and an insulating portion 52 connected to the conductive portion 51. In some embodiments, the conductive portion 51 and the insulating portion 52 are fixed as a whole by plugging. In some embodiments, the conductive portion 51 and the insulating portion 52 are integrally formed by insert injection molding. Optionally, the conductive portion 51 is made of metal and the insulating portion 52 is made of plastic.

[0049] Optionally, the inner diameter of the contact hole is smaller than the outer diameters of the conductive portion 51 and the insulating portion 52. Optionally, the inner diameter of the contact hole is smaller than the outer diameter of the conductive portion 51.

[0050] In this embodiment, the conductive parts 51 and the insulating parts 52 are arranged alternately to form the connecting element 5. The first connecting element 5a is mainly composed of the first conductive part 511, the first insulating part 521, the second conductive part 512, the fourth insulating part 524 and the fourth conductive part 514; the second connecting element 5b is mainly composed of the second insulating part 522, the third conductive part 513, the third insulating part 523, the fifth conductive part 515, the fifth insulating part 525 and the sixth conductive part 516.

[0051] Specifically, the first conductive portion 511 passes through the first positive contact hole 215, and the upper end of the first conductive portion 511 exceeds the upper end surface of the first positive contact tab 213 to output the voltage of the positive terminal of the battery pack 2;

[0052] The first insulating portion 521 is located between the first positive contact electrode 213 and the second negative contact electrode 224, and the first insulating portion 521 does not have any contact with the first positive contact electrode 213 and the second negative contact electrode 224, thereby electrically isolating the two.

[0053] The second conductive portion 512 passes through the second negative contact hole 226 and the third positive contact hole 235, and the upper end of the second conductive portion 512 exceeds the upper end surface of the second negative contact electrode 224, and at the same time, the lower end of the second conductive portion 512 exceeds the lower end surface of the third positive contact electrode 233, thereby electrically connecting the two;

[0054] The fourth insulating portion 524 is located between the third positive contact electrode 233 and the fourth negative contact electrode 244, and the fourth insulating portion 524 has no contact with the third positive contact electrode 233 and the fourth negative contact electrode 244, thereby electrically isolating the two.

[0055] The fourth conductive portion 514 passes through the fourth negative contact hole 246 and the fifth positive contact hole 255, and the upper end of the fourth conductive portion 514 exceeds the upper end of the fourth negative contact electrode 244, and at the same time the lower end of the fourth conductive portion 514 exceeds the lower end of the fifth positive contact electrode 253, thereby electrically connecting the two.

[0056] Specifically, the second insulating portion 522 is located at the upper end of the first negative contact tab 214;

[0057] The third conductive portion 513 passes through the first negative contact hole 216 and the second positive contact hole 225, and the upper end of the third conductive portion 513 exceeds the upper end surface of the first negative contact electrode 214, and at the same time, the lower end of the second conductive portion 512 exceeds the lower end surface of the second positive contact electrode 223, thereby electrically connecting the two;

[0058] The third insulating portion 523 is located between the second positive contact electrode 223 and the third negative contact electrode 234, and the third insulating portion 523 has no contact with the second positive contact electrode 223 and the third negative contact electrode 234, thereby electrically isolating the two.

[0059] The fifth conductive portion 515 passes through the third negative contact hole 236 and the fourth positive contact hole 245, and the upper end of the fifth conductive portion 515 exceeds the upper end surface of the third negative contact electrode 234, and at the same time, the lower end of the second conductive portion 512 exceeds the lower end surface of the fourth positive contact electrode 243, thereby electrically connecting the two;

[0060] The fifth insulating portion 525 is located between the fourth positive contact electrode 243 and the fifth negative contact electrode 254, and the third insulating portion 523 has no contact with the second positive contact electrode 223 and the third negative contact electrode 234, thereby electrically isolating the two.

[0061] The sixth conductive portion 516 passes through the fifth negative contact hole 256 , and the lower end of the sixth conductive portion 516 exceeds the lower surface of the fifth negative contact tab 254 to output the voltage at the negative end of the battery pack 2 .

[0062] Combination Figure 7 As shown in the current path diagram of the battery pack 2, multiple pole ears are arranged in the area where the conductive part 51 is located, and the insulating part 52 is arranged between the pole ears, so that five soft-pack battery cells are connected in series. This can be achieved through two connecting elements 5 without welding. The assembly process is simple and the contact is reliable, and dangerous conditions such as cold welding will not occur.

[0063] Specifically, the first conductive portion 511 connects the first positive contact tab 213 to connect the first soft-pack battery cell 21, the third conductive portion 513 connects the first negative contact tab 214 and the second positive contact tab 223 to connect the second soft-pack battery cell 22, the second conductive portion 512 connects the second negative contact tab 224 and the third positive contact tab 233 to connect the third soft-pack battery cell 23, the fifth conductive portion 515 connects the third negative contact tab 234 and the fourth positive contact tab 243 to connect the fourth soft-pack battery cell 24, the fourth conductive portion 514 connects the fourth negative contact tab 244 and the fifth positive contact tab 253 to connect the fifth soft-pack battery cell 25, and the sixth conductive portion 516 outputs the voltage of the negative terminal of the battery pack 2 by connecting the fifth negative contact tab 254.

[0064] Combination Figure 6 As shown, the battery device 100 also includes a retaining bracket 3 for accommodating the battery pack 2, a supporting member 4 connected to the retaining bracket 3, a conductor 6 fixed to a connecting element 5, a circuit board 7 arranged above the retaining bracket, and an output terminal 8 installed on the circuit board 7.

[0065] Specifically, the retaining bracket 3 has a frame 31 and a cover plate 32 connected to the frame 31, and the cover plate 32 is fixedly connected to the frame 31. Optionally, the cover plate 32 is fixed to the frame 31 by snaps. Optionally, the cover plate 32 is screwed to the frame 31. Optionally, the cover plate 32 is fixed to the frame 31 by both snaps and screws.

[0066] The cover plate 32 and the tab are arranged on the same side of the battery device 100. In this embodiment, the cover plate 32 is located at the rear side of the battery device 100. Optionally, the frame 31 has a front wall, an upper wall, a left wall and a right wall. Optionally, the frame 31 has a front wall, an upper wall, a lower wall, a left wall and a right wall. Optionally, the frame 31 has a front wall, a left wall and a right wall.

[0067] Combination Fig. 9 As shown, a plurality of support members 4 are connected to the retaining cover plate 32. Optionally, the number of the support members 4 is five. Optionally, the number of the support members 4 is ten.

[0068] Specifically, the support member 4 has a support plate 41 parallel to the extension direction of the soft-pack battery cell, a slot 42 penetrating the support plate 41, a step 43 extending downward from the support plate 41, and a pad 44 extending from the step 43 toward the battery pack 2. The support plate 41 is used to support the tab to prevent the tab from moving. At the same time, the center of the slot 42 and the center of the contact hole are on the same straight line, and the support plate 41 and the tab are spaced apart in the extension direction of the connecting element 5. Optionally, the support plate 41 supports one tab. Optionally, the support plate 41 supports two tabs of the same soft-pack battery cell.

[0069] In some embodiments, the cover plate 32 is provided with an insertion hole to facilitate the direct insertion of the connecting element 5 from above. Optionally, the cover plate 32 is provided with an upper insertion hole 321, so that the connecting element 5 is inserted from above, and the lower end of the connecting element 5 abuts against the bottom of the cover plate 32. Optionally, the cover plate 32 is provided with an upper insertion hole 321 and a lower insertion hole, so that the connecting element 5 is inserted from above, and the lower end of the connecting element 5 abuts against the bottom of the lower shell 12.

[0070] Since the tabs are arranged at random positions of the core body, the distance below the tabs is supplemented by setting steps, so that the tabs can be placed on the support plate 41 without tilting.

[0071] Combination Fig.10As shown, in some embodiments, the holding bracket 3 has a frame 31 and a U-shaped plate 33, and the U-shaped plate 33 is used to accommodate the soft-pack battery cells. The supporting member 4 is connected to the U-shaped plate 33 to support the tabs.

[0072] Please refer to Figure 2 and Figure 6 As shown, the battery pack 2 is electrically connected to the circuit board 7 via two conductors 6. Optionally, the conductor 6 is a cable. Optionally, the conductor 6 is a flexible circuit board.

[0073] In this embodiment, the conductor 6 has a first conductor 6a and a second conductor 6b, one end of the first conductor 6a is connected to the first conductive part 511, and the other end is connected to the circuit board 7 or directly connected to the positive output terminal 81 of the output terminal 8; one end of the second conductor 6b is connected to the sixth conductive part 516, and the other end is connected to the circuit board 7 or directly connected to the negative output terminal 82 of the output terminal 8.

[0074] The present invention connects the soft-pack battery cells in series by interference fit between two connecting elements 5 and the tabs, and can achieve a stable and reliable connection without complicated operations such as welding; and the connecting element 5 is formed by inserting / assembling a conductive part 51 and an insulating part 52, and the assembly process is simple.

[0075] The present invention is not limited to the above specific embodiments. Those skilled in the art can easily understand that there are many other alternatives to the battery device of the present invention without departing from the principle and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A battery device, comprising a housing and a battery pack accommodated in the housing, wherein the battery pack is formed by stacking a plurality of soft-pack battery cells, and each of the soft-pack battery cells is provided with a tab at the end thereof, and the plurality of tabs are arranged along a stacking direction to form a tab group; characterized in that: The battery device also includes a connecting element connected to the tab group, the connecting element is inserted into the tab group and connects a plurality of the soft-pack battery cells in series, the connecting element has a conductive part and an insulating part connected to the conductive part, and the tab is sleeved in the area where the conductive part is located.

2. The battery device according to claim 1, characterized in that: The connecting element is injection molded or assembled in parts.

3. The battery device according to claim 2, characterized in that: In the up-down direction of the battery device, the length of the connecting element is greater than the maximum distance between any two of the tabs.

4. The battery device according to claim 3, characterized in that: The soft-pack battery cell comprises a core body, an aluminum-plastic film covering the core body, a positive contact tab and a negative contact tab connected to the core body, a positive contact hole penetrating the positive contact tab and a negative contact hole penetrating the negative contact tab, wherein the inner diameters of the positive contact hole and the negative contact hole are smaller than the outer diameter of the conductive part.

5. The battery device according to claim 4, characterized in that: The battery pack has a first soft-pack battery cell and a second soft-pack battery cell, wherein the positive contact tab of the first soft-pack battery cell is aligned with the negative contact tab of the second soft-pack battery cell, and the negative contact tab of the first soft-pack battery cell is aligned with the positive contact tab of the second soft-pack battery cell.

6. The battery device according to claim 5, characterized in that: The connecting element comprises a first connecting element and a second connecting element, wherein the first connecting element comprises a first conductive portion passing through a positive contact hole of the first soft-pack battery cell, a second conductive portion passing through a negative contact hole of the second soft-pack battery cell, and a first insulating portion connected between the first conductive portion and the second conductive portion, wherein the first insulating portion is located between the positive contact tab of the first soft-pack battery cell and the negative contact tab of the second soft-pack battery cell; the second connecting element comprises a third conductive portion passing through the negative contact hole of the first soft-pack battery cell and the positive contact hole of the second soft-pack battery cell, and a second insulating portion and a third insulating portion respectively connected to ends of the third conductive portion, wherein the second insulating portion is located on an upper side of the negative contact tab of the first soft-pack battery cell, and the third insulating portion is located on a lower side of the positive contact tab of the second soft-pack battery cell.

7. The battery device according to claim 1, characterized in that: The battery device further includes a holding bracket for fixing the soft-pack battery cell and a supporting member connected to the holding bracket, wherein the supporting member supports the tab.

8. The battery device according to claim 7, characterized in that: The support member comprises a support plate parallel to the extension direction of the soft-pack battery cell and a slot penetrating the support plate, the inner diameter of the slot is larger than the outer diameter of the connecting element, and the connecting element is inserted into the slot.

9. The battery device according to claim 8, characterized in that: In the extending direction of the connecting element, the support plate and the pole lug are arranged at a distance from each other.

10. The battery device according to claim 6, characterized in that: The first conductive portion and the third conductive portion are respectively connected to a current loop of a battery device via conductors.

11. A battery device, comprising a housing and a battery pack contained in the housing, wherein the battery pack comprises a first soft-pack battery cell and a second soft-pack battery cell stacked together; characterized in that: The battery device also includes a first connecting element and a second connecting element connected to the battery pack, the insulating portion of the first connecting element electrically isolates the positive contact tab of the first soft-pack battery cell from the negative contact tab of the second soft-pack battery cell, and the conductive portion of the second connecting element penetrates the negative contact tab of the first soft-pack battery cell and the positive contact tab of the second soft-pack battery cell, and connects the first soft-pack battery cell and the second soft-pack battery cell in series.

Images