Pouch battery module

Abstract

This application relates to the field of battery technology, and in particular to a pouch battery module, comprising: a pouch battery assembly and a circuit board. The pouch battery assembly includes multiple pouch batteries stacked along a first preset direction. Each pouch battery has a positive tab and a negative tab extending along a second preset direction. The circuit board is disposed on one side of the pouch battery and has tab through-holes. The positive and negative tabs of any two adjacent pouch batteries pass through the corresponding tab through-holes and are bent onto the circuit board and overlapped, with the positive and negative tabs connected. As can be seen, the positive and negative tabs of the pouch batteries pass through the corresponding tab through-holes on the circuit board and are bent onto the circuit board, and the positive and negative tabs overlapped. The circuit board directly supports the tabs, eliminating the need for tab supports, resulting in a simpler structure and lower cost. Furthermore, eliminating the assembly steps of the circuit board and tab supports simplifies the process, saves labor, and also reduces costs.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a pouch battery module. Background Technology

[0002] Existing pouch battery modules are mostly composed of a shell, foam, plastic bracket, busbar, sampling circuit board or sampling harness. The busbar and sampling circuit board are both mounted on the plastic bracket. The pouch battery tabs pass through the plastic bracket, bend and fit against the busbar for laser welding. The sampling circuit board has sampling nickel sheets that are fitted and welded to the busbar. Alternatively, the sampling harness has sampling terminals that are bolted or welded to the busbar. However, this structure is complex, has many installation steps, and is costly. Utility Model Content

[0003] The purpose of this application is to provide a soft-pack battery module, which to some extent solves the technical problems of existing battery modules, such as integrating circuit boards and busbars on plastic brackets, welding the tabs of the soft-pack battery to the busbars, and welding the busbars to the circuit boards, resulting in a complex overall structure, many process steps, and high costs.

[0004] This application provides a pouch battery module, including: a pouch battery assembly and a circuit board; wherein, the pouch battery assembly includes a plurality of pouch batteries stacked sequentially along a first preset direction, and each of the pouch batteries has a positive electrode tab and a negative electrode tab extending along a second preset direction and located on the same side; The circuit board is disposed on the side of the pouch battery where the positive tab and the negative tab are formed, and the circuit board has tab through holes. The positive tab and the negative tab of any two adjacent pouch batteries pass through the corresponding tab through holes and are bent on the circuit board and stacked together, and the positive tab and the negative tab are connected.

[0005] In the above technical solution, the positive electrode tab and the corresponding negative electrode tab are further connected by welding.

[0006] In any of the above technical solutions, the circuit board is further provided with a soldering through hole, and the soldering through hole is located below the connection area between the positive electrode and the negative electrode.

[0007] In any of the above technical solutions, the welding through hole is further arranged parallel to the tab through hole.

[0008] In any of the above technical solutions, the positive electrode tab and / or the negative electrode tab are further connected to the circuit board.

[0009] In any of the above technical solutions, the circuit board is further provided with a solder pad, and the positive electrode tab and the negative electrode tab connected to each other are provided with a solder tab closer to the circuit board, and the solder tab is connected to the solder pad by soldering.

[0010] In any of the above technical solutions, the soft-pack battery module further includes tab foam, and the tab foam is disposed between the soft-pack battery and the circuit board, and the tab foam avoids the positive tab and negative tab of the soft-pack battery.

[0011] In any of the above technical solutions, the soft-pack battery module further includes a connector, and the connector is disposed on the side of the circuit board opposite to the soft-pack battery.

[0012] In any of the above technical solutions, a buffer foam is further provided between any two adjacent pouch batteries.

[0013] In any of the above technical solutions, the pouch battery module further includes a first lead-out bar and a second lead-out bar; wherein the first lead-out bar and the second lead-out bar are both disposed on the side of the circuit board opposite to the pouch battery; along the first preset direction, the positive electrode tab of one of the first pouch battery and the last pouch battery passes through the corresponding electrode tab through hole and bends onto the first lead-out bar, and is connected to the first lead-out bar, wherein the negative electrode tab of the other battery passes through the corresponding electrode tab through hole and bends onto the second lead-out bar, and is connected to the second lead-out bar.

[0014] In any of the above technical solutions, the first lead-out bar is further connected to the circuit board by soldering.

[0015] In any of the above technical solutions, the second lead-out is further connected to the circuit board by soldering.

[0016] In any of the above technical solutions, the positive electrode tab is further connected to the first lead-out bar by welding.

[0017] In any of the above technical solutions, the negative electrode tab is further connected to the second lead-out bar by welding.

[0018] In any of the above technical solutions, a first press-fit stud is further provided on the first lead-out bar.

[0019] In any of the above technical solutions, a second press-fit stud is further provided on the second lead-out bar.

[0020] In any of the above technical solutions, the first lead-out busbar is further defined as an aluminum busbar with polymer diffusion-bonded nickel sheets.

[0021] In any of the above technical solutions, the second lead-out is further defined as an aluminum busbar with polymer diffusion-bonded nickel sheets.

[0022] In any of the above technical solutions, the battery further includes a housing, a front cover, and a rear cover; wherein the housing is a hollow structure with openings at both ends, and along the second preset direction, the housing is fitted over the outside of the soft-pack battery assembly, and the front cover and the rear cover are respectively placed over the front opening and the rear opening of the housing.

[0023] In any of the above technical solutions, a front foam is further provided between the front cover and the circuit board.

[0024] In any of the above technical solutions, a rear foam is further provided between the rear cover and the soft-pack battery assembly.

[0025] In any of the above technical solutions, a side foam is further provided between the side wall of the housing and the corresponding side of the soft-pack battery assembly.

[0026] In any of the above technical solutions, the front cover and the housing are further fixed by adhesive tape.

[0027] In any of the above technical solutions, the back cover is further fixed to the housing by adhesive tape.

[0028] In any of the above technical solutions, the shell, the front cover, and the rear cover are all made of PP or PC.

[0029] Compared with the prior art, the beneficial effects of this application are as follows: The soft-pack battery module provided in this application has the positive and negative tabs of the soft-pack battery passing through the corresponding tab through holes on the circuit board and then bent onto the circuit board. The positive and negative tabs are directly connected together, and the circuit board is used to support the tabs, eliminating the need for tab brackets. The structure is simpler and the cost is lower. In addition, the assembly steps of the circuit board and tab brackets are eliminated, which simplifies the process, saves labor, and also reduces costs.

[0030] In addition, soldering holes are provided on the circuit board, located below the two series-connected tabs. During soldering, the size of the soldering head is larger than the width of the soldering hole, pressing it onto the tab. The soldering hole is located within the pressing area of ​​the head, and the laser weld seam is directly opposite the soldering hole and inside the soldering hole area. The laser penetrates through the tab and directly enters the soldering hole, without hitting the circuit board, thus preventing damage to the circuit board and making it safer and more reliable. Moreover, the laser energy is rapidly reduced after passing through the air layer before hitting the tab foam. Due to the reduced energy, the foam is not damaged, and the soldering quality is not affected, nor is the pouch battery affected. The tabs, which serve as the module leads, are attached to the busbar and can be soldered using conventional laser welding processes. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 An exploded view of the soft-pack battery module provided in the embodiments of this application; Figure 2 This is an assembly diagram of a soft-pack battery module provided in an embodiment of this application; Figure 3 for Figure 2 A partially enlarged structural diagram; Figure 4 An assembly diagram of the soft-pack battery assembly and circuit board provided in an embodiment of this application; Figure 5 for Figure 4 A partially enlarged structural diagram; Figure 6 This is a schematic diagram of the circuit board structure provided in an embodiment of this application; Figure 7 This is another assembly diagram of the soft-pack battery assembly and circuit board provided in an embodiment of this application; Figure 8 This is an assembly diagram of a soft-pack battery module provided in an embodiment of this application; Figure 9 Another assembly diagram of the soft-pack battery module provided in the embodiments of this application.

[0033] Figure label: 1-Pouch battery assembly, 101-Pouch battery, 1011-Positive tab, 1012-Negative tab, 1013-Welding tab, 2-Circuit board, 21-Taper through hole, 22-Welding through hole, 23-Welding pad, 3-Taper foam, 4-First lead-out, 5-Second lead-out, 6-First crimping stud, 7-Second crimping stud, 8-Connector, 9-Housing, 10-Front cover, 11-Rear cover, 12-Front foam, 13-Rear foam, 14-Side foam, 15-Tape, a-First preset direction, b-Second preset direction. Detailed Implementation

[0034] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0035] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0036] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The following reference Figures 1 to 9 This application describes a pouch battery module according to some embodiments.

[0040] See Figures 1 to 9 As shown, an embodiment of this application provides a pouch battery module, including: a pouch battery assembly 1 and a circuit board 2; wherein, the pouch battery assembly 1 includes a plurality of pouch batteries 101 stacked sequentially along a first preset direction a, and each pouch battery 101 has a positive electrode tab 1011 and a negative electrode tab 1012 extending along a second preset direction b and located on the same side. The circuit board 2 is disposed on the side of the soft-pack battery 101 where the positive tab 1011 and the negative tab 1012 are formed, and the circuit board 2 has tab through holes 21. The positive tab 1011 and the negative tab 1012 of any two adjacent soft-pack batteries 101 pass through the corresponding tab through holes 21 and are bent on the circuit board 2 and overlapped together. The positive tab 1011 and the negative tab 1012 are connected together. That is, the positive tab 1011 bends after passing through the corresponding tab through hole 21, the negative tab 1012 bends after passing through the corresponding tab, and a portion of the structure of the positive tab 1011 and the negative tab 1012 overlaps together.

[0041] As can be seen from the structure described above, in the soft-pack battery module provided by this application, the positive and negative tabs of the soft-pack battery 101 pass through the corresponding tab through holes 21 on the circuit board 2 and are bent on the circuit board 2. The positive tab 1011 and the negative tab 1012 are directly connected together, and the tabs are directly supported by the circuit board 2, eliminating the need for a tab bracket. The structure is simpler and the cost is lower. Moreover, the assembly steps of the circuit board 2 and the tab bracket are eliminated, which simplifies the process, saves labor, and also reduces costs.

[0042] In this embodiment, preferably, as follows: Figure 3 As shown, the positive electrode tab 1011 and the corresponding negative electrode tab 1012 are connected by welding. The welded structure is firm and stable, and the operation is simple and convenient. In this embodiment, preferably, as follows: Figure 6 and Figure 7 As shown, the circuit board 2 has a soldering through hole 22, and the soldering through hole 22 is located below the connection area between the positive electrode tab 1011 and the negative electrode tab 1012. As can be seen from the structure described above, a welding hole is provided on the circuit board 2. The welding hole is located below the two electrodes connected in series. During welding, the size of the welding head is larger than the width of the welding hole. It presses on the electrodes, and the welding hole is located in the pressing area of ​​the head. The laser weld is directly opposite the welding hole and is located inside the welding hole area. After the laser passes through the electrodes, it directly enters the welding hole and will not hit the circuit board 2, thus preventing damage to the circuit board 2 and making it safer and more reliable.

[0043] In this embodiment, preferably, as follows: Figure 6As shown, the welding through hole 22 is arranged parallel to the tab through hole 21. As can be seen from the structure described above, the bent structures of the positive electrode tab 1011 and the negative electrode tab 1012 also extend along the length direction of the welding through hole 22, and the welding pads 23 of both extend along the length direction of the electrode tab through hole 21. Consequently, the welding through hole 22 also extends along the length direction of the electrode tab through hole 21, so that the welding through hole 22 can be correspondingly set with the welding pad 23. Of course, it is not limited to this; the welding through hole 22 and the electrode tab through hole 21 can also form an angle, etc.

[0044] In this embodiment, preferably, as follows: Figure 3 and Figure 5 As shown, the positive tab 1011 and / or the negative tab 1012 are connected to the circuit board 2, which collects information about the pouch battery 101, such as temperature and voltage.

[0045] In this embodiment, preferably, as follows: Figure 3 , Figure 5 , Figure 6 Hezhi Figure 7 As shown, the circuit board 2 has a solder pad 23, and the positive electrode tab 1011 and the negative electrode tab 1012 connected to each other have a solder tab 1013 formed on the one closer to the circuit board 2, and the solder tab 1013 is connected to the solder pad 23 by soldering. As can be seen from the structure described above, the positive electrode 1011 and the negative electrode 1012 are provided with protruding welding ears 1013 on the side of the electrode closest to the circuit board 2. The welding ears 1013 are provided close to the side of the circuit board 2, which facilitates welding the welding ears 1013 to the welding pads 23 pre-set on the circuit board 2, thereby fixing the electrode and making the electrode more secure and stable.

[0046] In this embodiment, preferably, as follows: Figure 1 As shown, the pouch battery module also includes tab foam 3, which is disposed between the pouch battery 101 and the circuit board 2, and the tab foam 3 avoids the positive tab 1011 and the negative tab 1012 of the pouch battery 101 to avoid interference. As described above, a tab foam 3 is provided between the circuit board 2 and the pouch battery 101. This tab foam 3 adheres to the back of the circuit board 2 and the shoulder of the pouch battery 101, serving as a limit and buffer. In addition, a welding hole is provided on the circuit board 2, located below the two tabs connected in series. During welding, the size of the welding head is larger than the width of the welding hole, pressing against the tab. The welding hole is located within the pressing area of ​​the head, and the laser weld is directly opposite the welding hole and inside the welding hole area. The laser penetrates through the tab and directly enters the welding hole, without hitting the circuit board 2, thus protecting the circuit board 2. Furthermore, the laser energy is rapidly reduced after passing through the air layer before hitting the tab foam 3. Due to the reduced energy, the foam is not damaged, the welding quality is not affected, and the pouch battery 101 is not affected.

[0047] In this embodiment, preferably, as follows: Figure 3 , Figures 5 to 7 As shown, the pouch battery module also includes a first lead-out bar 4 and a second lead-out bar 5; wherein, the first lead-out bar 4 and the second lead-out bar 5 are both disposed on the side of the circuit board 2 away from the pouch battery 101; along the first preset direction a, the positive electrode tab 1011 of one of the first pouch battery 101 and the last pouch battery 101 passes through the corresponding electrode tab through hole 21 and is bent on the first lead-out bar 4 and connected to the first lead-out bar 4, wherein the negative electrode tab 1012 of the other passes through the corresponding electrode tab through hole 21 and is bent on the second lead-out bar 5 and connected to the second lead-out bar 5. As can be seen from the structure described above, circuit board 2 has two lead-out bars, which can be used as a total positive and total negative lead-out structure.

[0048] In this embodiment, preferably, as follows: Figure 3 and Figure 5 As shown, the first lead-out bar 4 is connected to the circuit board 2 by soldering. The structure after soldering is firm and the operation is simple and convenient. In this embodiment, preferably, as follows: Figure 3 and Figure 5 As shown, the second lead-out 5 is connected to the circuit board 2 by soldering. The structure after soldering is firm and the operation is simple and convenient. In this embodiment, preferably, as follows: Figure 3 , Figure 5 and Figure 7 As shown, the positive electrode tab 1011 is connected to the first lead-out bar 4 by welding. The structure after welding is firm and the operation is simple and convenient.

[0049] In this embodiment, preferably, as follows: Figure 3 , Figure 5 and Figure 7As shown, the negative electrode tab 1012 is connected to the second lead-out bar 5 by welding. The structure after welding is firm and the operation is simple and convenient. In this embodiment, preferably, as follows: Figure 3 , Figure 5 and Figure 7 As shown, a first crimping stud 6 is provided on the first lead-out bus 4, which is connected to the external main circuit harness through the crimping stud. The first lead-out bus 4 can be a copper-plated nickel bus, an aluminum bus with a surface polymer diffusion-welded nickel sheet, or a steel-plated nickel bus, etc. Each has its advantages and disadvantages. Among them, copper-plated nickel has excellent performance and high price, aluminum bus with nickel sheet has excellent performance and low price, and steel-plated nickel bus has poor performance, the lowest price, and is easy to corrode. The aluminum bus with polymer diffusion-welded nickel sheet is preferred.

[0050] In this embodiment, preferably, as follows: Figure 3 , Figure 5 and Figure 7 As shown, a second crimping stud 7 is provided on the second lead-out bus 5, which is connected to the external main circuit harness through the crimping stud. The second lead-out bus 5 can be a copper-plated nickel bus, an aluminum bus with polymer diffusion soldered nickel sheet, or a steel-plated nickel bus, etc., each with its own advantages and disadvantages. Among them, copper-plated nickel has excellent performance and high price, aluminum bus with soldered nickel sheet has excellent performance and low price, and steel-plated nickel bus has poor performance, the lowest price, and is prone to corrosion. The aluminum bus with polymer diffusion soldered nickel sheet is preferred.

[0051] In this embodiment, preferably, as follows: Figure 3 , Figure 5 and Figure 7 As shown, the pouch battery module also includes a connector 8, which is located on the side of the circuit board 2 opposite to the pouch battery 101. As can be seen from the structure described above, connector 8 can transmit the signal of the soft-pack battery 101 used in circuit board 2 to the battery management module, etc., to output information.

[0052] In this embodiment, preferably, a buffer foam (not shown in the figure) is provided between any two adjacent pouch cells 101 to serve as a buffer.

[0053] In this embodiment, preferably, as follows: Figure 1 , Figure 8 and Figure 9 As shown, the battery also includes a housing 9, a front cover 10, and a rear cover 11; wherein, the housing 9 is a hollow structure with openings at both ends, and along the second preset direction b, the housing 9 is fitted onto the outside of the soft-pack battery assembly 1, and the front cover 10 and the rear cover 11 are respectively fitted onto the front opening and the rear opening of the housing 9. As can be seen from the structure described above, the outer shell is set into three separate structures, namely the shell 9, the front cover 10 and the rear cover 11, which facilitates the assembly with the soft-pack battery assembly 1 and improves the ease of operation.

[0054] In this embodiment, preferably, as follows: Figure 1 As shown, a front foam 12 is provided between the front cover 10 and the circuit board 2. As can be seen from the structure described above, the front foam 12 is placed between the circuit board 2 and the front cover 10 to serve as a buffer and limiter.

[0055] Furthermore, preferably, the front foam 12 has a rectangular flat structure.

[0056] In this embodiment, preferably, as follows: Figure 1 As shown, a rear foam 13 is provided between the rear cover 11 and the soft-pack battery assembly 1. As can be seen from the structure described above, a rear foam 13 is provided between the soft-pack battery assembly 1 and the rear cover 11 to serve as a buffer and limiter.

[0057] Furthermore, preferably, the rear foam 13 has a rectangular flat structure.

[0058] In this embodiment, preferably, as follows: Figure 1 As shown, a side foam 14 is provided between the side wall of the housing 9 and the corresponding side of the soft-pack battery assembly 1. As can be seen from the structure described above, side foam 14 is provided between each side of the soft-pack battery 101 and the corresponding side wall of the housing 9, thereby protecting the side of the soft-pack battery assembly 1.

[0059] As can be seen, in this application, foam is provided at the front end, rear end and sides of the soft-pack battery assembly 1, so that the soft-pack battery assembly 1 can be protected in all directions.

[0060] Furthermore, preferably, the soft-pack battery assembly 1 is in the shape of a cuboid with four sides, and thus four rectangular flat foams are provided accordingly. Of course, it is not limited to this and can be selected according to actual needs.

[0061] In this embodiment, preferably, as follows: Figure 1 As shown, the front cover 10 and the housing 9 are fixed together by tape 15. As can be seen from the structure described above, the front cover 10 and the housing 9 are fixed with tape 15, which makes them more secure and easier to operate.

[0062] In this embodiment, preferably, as follows: Figure 1 As shown, the back cover 11 is fixed to the housing 9 by tape 15. As can be seen from the structure described above, the back cover 11 and the housing 9 are fixed with tape 15, which makes them more secure and easier to operate.

[0063] In this embodiment, preferably, the shell 9, the front cover 10 and the rear cover 11 are all made of PP or PC, which have good flame retardant and insulation properties, and can be formed by bending plastic sheets.

[0064] In summary, the soft-pack battery module provided in this application has the following structure and advantages: The soft-pack battery module provided in this application includes components such as a soft-pack battery 101, a circuit board 2, foam, a housing 9, a front cover 10, and a rear cover 11; wherein, a large area of ​​foam is attached between any adjacent soft-pack batteries 101; the circuit board 2 is provided with a connector 8 for connecting to an external sampling harness; the circuit board 2 is provided with a first lead-out 4 and a second lead-out 5, and the two lead-outs have press-fit studs for easy connection to an external main circuit harness; the two busbars can be copper-plated nickel busbars, aluminum busbars with polymer diffusion soldered nickel sheets, or steel-plated nickel busbars, etc., each with its own advantages and disadvantages. Among them, copper-plated nickel has excellent performance and high price, aluminum busbars with soldered nickel sheets have excellent performance and low price, and steel-plated nickel busbars have poor performance, the lowest price, and are prone to corrosion. The preferred option is aluminum busbars with polymer diffusion soldered nickel sheets. Both connector 8 and busbar can be fixed to circuit board 2 by reflow soldering process; the positive and negative tabs of the soft pack battery 101 pass through the corresponding tab through holes 21 on circuit board 2 and are bent on circuit board 2, and the positive and negative tabs overlap together and are connected to each other by soldering. The positive tab 1011 of one of the two outermost pouch batteries 101 and the negative tab 1012 of the other pass through the corresponding tab through-hole 21 and are bent onto the busbar, and can be connected by welding; tab foam 3 is provided between the circuit board 2 and the battery, and the tab foam 3 is attached to the back of the circuit board 2 and the shoulder of the pouch battery 101, which plays a role in limiting and buffering; when the tabs of the pouch battery 101 are bent, except for the tab of the module lead-out terminal which is bent onto the busbar, the other tabs are bent, and the positive tab 1011 and the negative tab 1012 are attached together and then laser welded; In previous designs, a metal busbar was added below the tabs for welding to prevent the laser from directly hitting the battery, damaging it, or reaching other materials such as plastic, thus affecting the welding quality. In this application, welding holes are provided on the circuit board 2, located below the two tabs connected in series. During welding, the size of the welding head is larger than the width of the welding hole, pressing against the tabs. The welding hole is located within the pressing area of ​​the head, and the laser weld is directly opposite the welding hole and inside the welding hole area. After the laser penetrates the tabs, it will not hit the circuit board 2, causing damage. Instead, it rapidly reduces its energy through the air layer before hitting the tab foam 3. Because the energy is reduced, it will not damage the tab foam 3, nor will it affect the welding quality, nor will it affect the pouch battery 101. Voltage sampling is achieved through the tabs of the pouch battery 101 and the circuit board 2. Since the tabs used for positive and negative leads are welded to the aforementioned first lead 4 and second lead 5, and the two lead 5 are welded to the circuit board 2 via reflow soldering, internal wiring can be directly designed on the circuit board 2 to connect the two lead 5 and the connector 8. The negative electrode tab 1012 of the soft-pack battery 101 is copper plated with nickel. The negative electrode tab 1012 of the soft-pack battery 101 in series can be cut to form a welding tab 1013. The circuit board 2 has a welding pad 23 preset at the corresponding position of the welding tab 1013. The welding tab 1013 is directly soldered onto this welding pad 23. The welding pad 23 is connected to the connector 8 through the internal circuit of the circuit board 2 to realize the sampling voltage output.

[0065] Based on the above, this application proposes a low-cost and simple-structured soft-pack battery module. After the soft-pack batteries 101 are stacked into a group, foam is attached to the sides and back for protection. After the tabs are welded, front foam 12 is attached to the tabs. The shell 9 is made of plastic sheet bent into a cylindrical shape. The material can be PP or PC, etc., which has good flame retardant and insulating properties. The bent and overlapping parts are ultrasonically welded into a cylindrical shape. First, the assembly structure of the soft-pack battery assembly 1 and other structural components is put into the shell, and then the front cover 10 and the back cover 11 are sealed. The front cover 10 and the shell 9 are fixed with tape 15 after assembly, and the back cover 11 and the shell 9 are fixed with tape 15 after assembly. There is front foam 12 between the front cover 10 and the battery assembly for limiting and buffering, and there is rear foam 13 between the back cover 11 and the soft-pack battery assembly 1 for limiting and buffering, which effectively protects the soft-pack battery assembly 1 during use.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A soft-pack battery module, characterized in that, include: A pouch battery assembly and a circuit board; wherein the pouch battery assembly includes a plurality of pouch batteries stacked sequentially along a first preset direction, and each of the pouch batteries has a positive electrode tab and a negative electrode tab extending along a second preset direction and located on the same side; The circuit board is disposed on the side of the pouch battery where the positive tab and the negative tab are formed, and the circuit board has tab through holes. The positive tab and the negative tab of any two adjacent pouch batteries pass through the corresponding tab through holes and are bent on the circuit board and stacked together, and the positive tab and the negative tab are connected.

2. The soft-pack battery module according to claim 1, characterized in that, The positive electrode tab and the corresponding negative electrode tab are connected by welding.

3. The soft-pack battery module according to claim 2, characterized in that, The circuit board has solder through holes, and the solder through holes are located below the connection area between the positive and negative electrodes; and / or The welding through hole is arranged parallel to the tab through hole.

4. The soft-pack battery module according to claim 1, characterized in that, The positive electrode tab and / or the negative electrode tab are connected to the circuit board.

5. The soft-pack battery module according to claim 4, characterized in that, The circuit board has a solder pad, and the positive electrode tab and the negative electrode tab connected to it have a solder ear on the side closer to the circuit board, and the solder ear is connected to the solder pad by soldering.

6. The soft-pack battery module according to claim 1, characterized in that, The pouch battery module further includes tab foam, which is disposed between the pouch battery and the circuit board, and the tab foam avoids the positive and negative tabs of the pouch battery; and / or The pouch battery module further includes a connector, and the connector is disposed on the side of the circuit board opposite to the pouch battery; and / or A cushioning foam is provided between any two adjacent pouch batteries.

7. The soft-pack battery module according to claim 1, characterized in that, The pouch battery module further includes a first lead-out bar and a second lead-out bar; wherein, the first lead-out bar and the second lead-out bar are both disposed on the side of the circuit board opposite to the pouch battery; along the first preset direction, the positive electrode tab of one of the first pouch battery and the last pouch battery passes through the corresponding electrode tab through hole and bends onto the first lead-out bar, and is connected to the first lead-out bar, wherein the negative electrode tab of the other battery passes through the corresponding electrode tab through hole and bends onto the second lead-out bar, and is connected to the second lead-out bar.

8. The soft-pack battery module according to claim 7, characterized in that, The first lead-out pin is connected to the circuit board by soldering; and / or The second lead is connected to the circuit board by soldering; and / or The positive electrode tab is connected to the first lead-out bar by welding; and / or The negative electrode tab is connected to the second lead-out bar by welding; and / or The first lead-out bar is provided with a first press-fit stud; and / or The second lead-out bar is provided with a second press-fit stud; and / or The first lead-out busbar is an aluminum busbar with polymer diffusion-bonded nickel sheets; and / or The second lead-out is an aluminum busbar with polymer diffusion soldered nickel sheet.

9. The soft-pack battery module according to any one of claims 1 to 8, characterized in that, The battery also includes a housing, a front cover, and a rear cover; wherein the housing is a hollow structure with openings at both ends, and along the second preset direction, the housing is fitted over the outside of the soft-pack battery assembly, and the front cover and the rear cover are respectively placed over the front opening and the rear opening of the housing.

10. The soft-pack battery module according to claim 9, characterized in that, A front foam is provided between the front cover and the circuit board; and / or A rear foam is provided between the rear cover and the soft-pack battery assembly; and / or Side foam is provided between the side wall of the housing and the corresponding side of the pouch battery assembly; and / or The front cover is fixed to the housing with tape; and / or The rear cover is fixed to the housing with tape; and / or The shell, the front cover, and the rear cover are all made of PP or PC.

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