Encapsulated battery pack and manufacturing method thereof

Abstract

The invention relates to a potting battery pack and a manufacturing method thereof, the potting battery pack comprises a cooling pipe, a battery cell assembly, a box body, a potting adhesive, a collection plate and a connection plate, the battery cell assembly comprises a battery cell unit A, a battery cell unit B and a work bar, and the two battery cell units A / B are electrically communicated through the work bar; each battery cell unit A / B comprises a plurality of rows of upper and lower cylindrical battery cells, the cylindrical battery cells are upper and lower bipolar column battery cells, upper-end positive electrodes and lower-end negative electrodes of the cylindrical battery cells are completely identical in structure, positive and negative columns respectively protrude out of a cylindrical battery cell shell, and insulating parts are sleeved outside the positive and negative columns and are lower than the positive and negative columns to expose the positive and negative columns; the pouring sealant is poured to the horizontal position of the insulating part so as to protect the insulating part from being affected by welding splashes. By adopting the potting battery pack provided by the invention, the insulating part can be protected from being influenced by welding splashes in multiple aspects, and the cylindrical battery core can also be protected from being influenced by condensed water.

Description

Technical Field

[0001] The present disclosure relates to a potted battery pack and a method for manufacturing the same. Background Art

[0002] As a common energy storage unit in the power grid, the energy storage battery pack has high energy density and long life. As the smallest energy unit of the battery pack, the small-capacity cylindrical battery cell is usually connected in series and parallel with multiple cylindrical battery cells to ensure its total energy requirements. During the use of the battery cell, a lot of heat will be generated, so the battery pack will be equipped with a cooling system to manage the heat of the battery cell. The energy storage battery pack is installed in an ordinary container cabinet, which generally does not have a dehumidification device. When the battery pack is cooled, condensation water is easily generated.

[0003] The positive and negative poles of the existing cylindrical battery cells are located on the same side, and the connecting bar is connected to the battery cell, and single-sided welding, that is, the connecting bar is welded to the positive and negative poles of the battery cell, and the welding is done on the same side. For example, the Tesla battery pack uses cylindrical battery cells, multiple battery cells are connected in series and parallel, and the serpentine cooling tube is located on the side of the cylindrical battery cell. The battery cell connecting bar is on one side, and laser welding is used to achieve the connection between the connecting bar and the battery cell. When single-sided welding, the connecting bar is connected to the positive and negative poles on the same side of the battery cell, and the connection method is laser welding. The positive (negative) end of the battery cell is equipped with an insulating part, and the rubber ring is made of plastic. When laser welding is used to weld the aluminum bar and the battery cell, there will be more or less splashes. This splash is close to the insulating part, and the temperature of the splash exceeds 600 degrees. If it splashes onto the insulating part, it may burn the sealing ring, causing serious burns, causing the insulating part to fail and cause the battery cell to leak, causing a safety accident. The above-mentioned single-sided welded connecting bar cannot be applied to cylindrical batteries with upper and lower bipolar columns. When the battery cell is cooled, the impact of condensed water on the positive and negative electrodes may cause a battery short circuit.

[0004] In CN117374520A, the positive terminal 201 and the negative terminal 202 of the cylindrical battery cell are both located at the top, and the negative output row 10a and the positive output row 10b are both located at the top of the battery cell. When the positive and negative electrodes are welded, the welding spatter will affect the insulating parts near the poles; and this patent also does not have a cooling component. Patent CN113764832A is similar to the above patent, which is also single-sided welding, and the first connecting row 10 is an integrated molding structure, which not only improves the structural strength of the first connecting row 10 and extends the service life of the first connecting row 10, but also makes the processing of the first connecting row 10 easier and simpler, and reduces the processing cost and difficulty of the connecting row assembly. The patent does not mention the impact of welding spatter. In fact, the structure of the connecting row body cannot prevent the impact of welding spatter on the insulating parts.

[0005] Although the connection row in CN104733669B is double-sided welded, a positive terminal Btp is formed at one axial end of each battery Bt, and a negative terminal Btn is formed at the other end. The battery rows BG(1) and BG(3) are arranged with the positive terminal Btp facing upward, and the battery rows BG(2) and BG(4) are arranged with the positive terminal Btp facing downward. The first busbar holding component 40 holds three busbars composed of metal thin plates, namely the positive busbar 41, the connecting busbar 42 and the negative busbar 43. Each busbar is formed with a terminal opening 41h, 42h, 43h, and the positive terminal Btp or the negative terminal Btn of the battery Bt is exposed from the terminal opening 41h, 42h, 43h. Each busbar is a whole plate with a hole in the middle to expose the battery terminal, and the battery terminal and the busbar are connected by wiring 81 / 82. This busbar structure cannot cover the insulating parts to prevent welding spatter, and it is not convenient to match the tolerance of many battery terminals in a row, which is not conducive to the neat arrangement of each battery cell; in addition, it is set to cool the cooling gas, and does not involve the elimination of condensed water. CN110137423A patent is similar to CN104733669B. Summary of the invention

[0006] In order to solve the technical problems that single-sided welding of the connecting bar is prone to produce spatters that affect the insulating parts exposed near the pole and the condenser tube is prone to produce condensed water that affects the sides of the battery cell, a potted battery pack and a manufacturing method thereof are provided, which can achieve the technical effect of protecting the insulating parts exposed to the outside and preventing condensed water from affecting the sides of the battery cell.

[0007] Technical Solution

[0008] In one aspect of the present disclosure, a potted battery pack is provided, the battery pack comprising a cooling pipe, a battery cell assembly, a box, a potting glue, a collection board and a connecting board, characterized in that the battery cell assembly is located inside the box, the box is filled with potting glue, the cooling pipe is arranged between the sides of adjacent rows of cylindrical battery cells and a joint is led out from the left side of the box, the battery cell assembly comprises a battery cell unit A, a battery cell unit B, and a working row, the two battery cell units A / B are electrically connected through the working row, and the collection board is located above the box for collecting parameters of the cylindrical battery cells; the battery cell unit A / B includes several upper and lower rows of cylindrical battery cells, which are upper and lower bipolar cylindrical battery cells. The upper positive pole and the lower negative pole of the cylindrical battery cell have exactly the same structure. The positive and negative poles protrude from the cylindrical battery cell shell respectively. Insulating parts are arranged outside the positive and negative poles. The height of the insulating parts is lower than the positive and negative poles to expose the positive and negative poles. Sealing parts are arranged between the positive and negative poles and the insulating parts; the working row includes a long connecting row and a short connecting row located on the front and back sides of the cylindrical battery cell, which are connected in series and parallel with multiple cylindrical battery cells and are separately arranged. The short connecting row can cover the insulating parts of the cylindrical battery cell.

[0009] Preferably, the long connecting bar is formed into a square wave structure with a notch and a corresponding convex bump. The long connecting bar is assembled to the upper and lower surfaces of the cylindrical battery cell through an insulating plate, and the right end of the connecting bar is connected to the positive connecting bar or the negative connecting bar.

[0010] Preferably, the short connecting row includes a ring and a long arm, the long arm and the ring surface have a certain step, the ring is higher than the long arm, the long arm has a variable cross-section feature, the shape of the long arm matches the notch, the ring and the shape of the positive and negative poles of the battery cell are exactly matched and welded, and the long arm of the short connecting row can completely cover the insulating part protruding from the cylindrical battery cell shell and lower than the positive and negative poles.

[0011] Preferably, the battery cell units A / B include two upper and lower rows of cylindrical battery cells respectively, and the upper and lower rows of cylindrical battery cells are staggered to save space.

[0012] Preferably, the battery cell unit A includes 5 battery cell groups arranged from left to right, namely the first group, the second group, ... the fifth group, the first group, the third group and the fifth group have the same structure, and their five battery cells are respectively composed of three battery cells in the upper row and two battery cells in the lower row to form a W shape, and all the cylindrical battery cells have positive poles facing upwards, the second group and the fourth group have the same structure, and their five battery cells are respectively composed of two battery cells in the upper row and three battery cells in the lower row to form an M shape, and all the cylindrical battery cells have negative poles facing upwards, and the leftmost side of the battery cell unit A is the positive electrode row, and the left end of the positive electrode row is connected to the connecting row.

[0013] Preferably, the potting glue completely pots the sides of all cylindrical battery cells to prevent the influence of condensed water on the battery cells, and the potting glue can be potted above the insulating parts to protect the insulating parts from the influence of welding spatter.

[0014] Preferably, a plurality of short connecting bars are arranged at intervals in the length direction of the long connecting bars, and the number of the short connecting bars matches the number of the cylindrical battery cells.

[0015] Preferably, the rectangular box body comprises 5 closed structures which together constitute a potting chamber; the wall body has a positive electrode slot and a negative electrode slot structure; the wall body has an arc surface, and the arc surface on the wall body matches the side surface of the cylindrical battery cell to better fix the battery cell unit.

[0016] Preferably, the connecting plate is a wavy structure having an arc surface, the size of the arc surface is equal to the diameter of the battery cell, and the connecting plate is located between the battery cell unit A and the battery cell unit B.

[0017] Preferably, the cooling pipe is a wave-shaped structure with an arc surface, the size of which is equal to the diameter of the battery core; the cooling pipe includes a water inlet pipe joint and a plug.

[0018] Preferably, the acquisition board comprises: a signal plug, a long acquisition sheet, a short acquisition sheet, a temperature sensor, and a long PCB body; the PCB body is provided with a long acquisition sheet, a short acquisition sheet, a temperature sensor, and a signal plug in the length direction. In another aspect of the present disclosure, a battery pack housing structure comprising at least one battery pack is provided.

[0019] In another aspect of the present disclosure, a vehicle is provided, comprising: the battery pack housing structure, and the longitudinal direction of at least one battery pack can be arranged to be approximately perpendicular to the length direction of the vehicle, so that the side structural unit provides protection for the multiple battery cells during a front collision or a rear collision of the vehicle.

[0020] Preferably, the plurality of battery cells may be compressed in a height direction of the cylindrical can of each of the plurality of battery cells.

[0021] In another aspect of the present disclosure, a method for manufacturing a potted battery pack is provided, comprising the following steps:

[0022] Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells are arranged in sequence with an upper and lower staggered arrangement and bonded to both sides of the corresponding arc surface of the cooling tube. Multiple rows of battery cells are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to both sides of the connecting plate to form a whole for standby use;

[0023] Step 2: After the long connecting bars and the insulating plates are assembled, they are assembled together on the upper and lower sides of the whole described in step 1;

[0024] Step 3: Connect the long arms of multiple short connecting bars to the notches of long connecting bars. The ring structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell. The variable cross-section of the long arms matches the shape of the long connecting bars. At this time, the short connecting bars can completely cover the insulating parts of the battery cell. Laser weld the short connecting bars, the positive and negative poles of the cylindrical battery cell, and the long connecting bars to form a battery cell assembly.

[0025] Step 4: Assemble the battery cell assembly into the box, and bond the arc surface on the wall of the box to the arc surface of the battery cell assembly;

[0026] Step 6. Finally, pour the potting compound to fill all the gaps between the battery cell assembly and the box body and completely cover the battery cell assembly. At this time, part of the cooling tube and part of the positive and negative electrodes of the battery cell assembly are exposed outside, and the rest are wrapped and sealed by the potting compound.

[0027] In yet another aspect of the present disclosure, a method for manufacturing a potted battery pack is provided, comprising the following steps:

[0028] Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells are arranged in sequence with an upper and lower staggered arrangement and bonded to both sides of the corresponding arc surface of the cooling tube. Multiple rows of battery cells are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to both sides of the connecting plate to form a whole for standby use;

[0029] Step 2: After the long connecting bars and the insulating plates are assembled, they are assembled together on the upper and lower sides of the whole described in step 1;

[0030] Step 3: Connect the long arms of multiple short connecting bars to the notches of the long connecting bars. The ring structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell, and the variable cross-section of the long arms matches the shape of the long connecting bars. At this time, the short connecting bars can completely cover the insulating parts of the battery cell.

[0031] Step 4: Assemble the battery cell assembly into the box, and bond the arc surface of the wall of the box to the arc surface of the battery cell assembly;

[0032] Step 5. Pour the potting compound to fill all the gaps between the battery cell assembly and the box body, and completely fill it to cover the insulating parts. At this time, since the positions of the long connecting bars and the short connecting bars are higher than the insulating parts, the potting compound will not affect the long connecting bars, short connecting bars, and the positive and negative poles of the cylindrical battery cell; part of the cooling tube of the battery cell assembly and part of the positive and negative poles are exposed outside, and the rest are wrapped and sealed by the potting compound.

[0033] Step 6: Laser weld the short connecting bars, the positive and negative poles of the cylindrical battery cells, and the long connecting bars.

[0034] Beneficial Effects

[0035] According to the above-mentioned various embodiments, the bipolar column arrangement of the cylindrical battery cell with the same structure at the top and bottom, wherein the insulating part is located outside the shell and lower than the positive and negative poles, provides a good foundation for double-sided welding, the arrangement of the work row structure and the potting height of the potting glue. Double-sided welding makes it possible to pot to the horizontal position of the insulating part, and therefore the potting height can protect the insulating part. The potting glue pots the sides of all the cylindrical battery cells, which can prevent the influence of condensed water on the cylindrical battery cells and improve the service life of the cylindrical battery cells.

[0036] In addition, compared with the overall plate design, the long and short connecting bars that are separately set up can help to make the ring of each connecting bar and the pole shape of each cylindrical battery cell firmly match within the tolerance range. The connecting bar can not only assist in fixing the battery cell, but also ensure that the insulating parts are covered, which is convenient for assembly and later welding, and improves the welding quality. The matching and fixing of the connecting bar and the pole of the cylindrical battery cell also helps to install the cooling pipe that fits the outer side shape of the cylindrical battery cell perfectly, and improves the cooling effect of the cooling pipe. Therefore, the bipolar cylindrical battery cell, double-sided welding, potting, and the long and short connecting bars that are separately set up complement each other, and together strengthen the protection of the insulating parts and keep the battery cell dry to prevent the influence of condensation water on the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings illustrate example embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure, and thus the present disclosure is not to be construed as being limited to the accompanying drawings.

[0038] Figure 1 This is a picture of the potting module;

[0039] Figure 2 It is the internal structure of the potting module after removing the potting glue;

[0040] Figure 3 This is the front view of the battery cell assembly;

[0041] Figure 4 This is the reverse side of the battery cell assembly;

[0042] Figure 5 It is a structural diagram of the battery cell unit A;

[0043] Figure 6 It is a schematic diagram of the structure of the box;

[0044] Figure 7 It is the structural diagram of the connecting plate;

[0045] Figure 8 It is the structural diagram of the cooling pipe;

[0046] Fig. 9 This is the structural diagram of the acquisition board;

[0047] Fig.10 It is a structural diagram of a long busbar;

[0048] Fig.11 It is the structural diagram of the short bus;

[0049] Fig.12 It is a structural diagram of an insulating board. DETAILED DESCRIPTION

[0050] By describing the embodiments of the present disclosure in detail with reference to the accompanying drawings, the present disclosure will become more apparent. It should be understood that the embodiments disclosed herein are illustrative and are only used to better understand the present disclosure, and the present disclosure can be modified in various ways. In addition, in order to facilitate the understanding of the present disclosure, the accompanying drawings are not drawn to true scale, but the sizes of some components may be exaggerated.

[0051] Embodiment 1:

[0052] See also Figure 1 and Figure 2As shown, a potted battery pack includes: a cooling tube 11, a battery cell assembly 12, a box 13, a potting glue 14, a collection plate 15 and a connecting plate 19, wherein the battery cell assembly 12 is located inside the box 13, the box 13 is filled with the potting glue 14, the cooling tube 11 is arranged between the sides of adjacent rows of cylindrical batteries and leads out from the left side of the box, see Figure 3-4 The battery cell assembly 12 includes a battery cell unit A 121, a battery cell unit B 122, and a working row 123. The two battery cell units A / B are electrically connected through the working row 123. The collection board (15) is located above the box 13 and is used to collect parameters of the connection row.

[0053] See also Figure 3-5 , the battery cell unit A, comprises: a plurality of upper and lower rows, preferably two rows of cylindrical battery cells 1221, adjacent rows are staggered to save space, the cylindrical battery cell targeted by the present application is a special bipolar column battery cell, the upper end of the cylindrical battery cell, that is, the positive electrode, and the lower end, that is, the negative electrode, have exactly the same structure, the positive and negative poles protrude from the cylindrical battery cell shell respectively, and insulating parts are arranged outside the positive and negative poles, and sealing parts are arranged between the positive and negative poles and the insulating parts; compared with the battery cell with the positive and negative poles on the same side, this battery cell structure can better block the positive and negative poles, and provide a basis for double-sided welding of the double-sided connection row, and because the battery cell with the positive and negative poles on the same side is welded on the single-sided connection row, the connection row must be welded to the relatively high protruding positive pole column and the relatively low negative pole shell, so the potting glue cannot be potted to the upper end surface of the shell, while the battery cell with double-sided pole column and double-sided welding connection row, the potting glue can be potted to the upper surface of the shell or even to the insulating part protruding from the shell, so that the insulating part can be protected from the influence of welding slag to a certain extent.

[0054] like Figure 3-5 As shown in , the battery cell unit A is arranged with 5 groups from left to right, namely the first group, the second group, ... the fifth group, the first group, the third group and the fifth group have the same structure, and their five battery cells are respectively composed of three battery cells in the upper row and two battery cells in the lower row to form a W shape, and all the cylindrical battery cells are positively facing upward, the second group and the fourth group have the same structure, and their five battery cells are respectively composed of two battery cells in the upper row and three battery cells in the lower row to form an M shape, and all the cylindrical battery cells are negatively facing upward, the leftmost side of the battery cell unit A is the positive electrode connection row, the leftmost side of the battery cell unit B is the negative electrode connection row, and the left ends of the positive and negative electrode connection rows are connected to the working row.

[0055] The working row 123 includes an insulating plate 1222, a long connecting row 1223, and a short connecting row 1224. The right end of the working row leads to a positive connecting row 1225. The structural features of the long connecting row 1223 include: a notch 12231 and a corresponding convex bump 1224. The structure of the short connecting row 1224 includes: a ferrule 12241 and a long arm 12242. The long arm and the ferrule surface have a certain step, the ferrule is higher than the long arm, and the long arm 12242 has a variable cross-section feature. The shape of the long arm 12242 matches the notch 12231 and is welded. The ferrule 12241 matches the shape of the positive and negative poles of the battery cell and is welded. The short connecting row can completely cover the insulating parts of the battery cell to protect the insulating parts, so that the insulating parts are doubly protected by the potting glue and the short connecting row.

[0056] Compared with the overall plate design structure, the separately set long connecting row and short connecting row help to make the work row and each cylindrical battery cell pole match firmly within the tolerance range. The work row can not only help fix the battery cell, but also ensure that the insulating parts are covered, which is convenient for later welding and improves the welding quality. The matching and fixing of the connecting row and the cylindrical battery cell pole also helps to install the cooling pipe that fits the outer shape of the cylindrical battery cell perfectly, improving the cooling effect of the cooling pipe. The whole plate design obviously cannot make the work row match the shape of the positive and negative poles of multiple rows of cylindrical batteries, cannot ensure that each insulating part is covered, and cannot ensure that the serpentine cooling pipe can perfectly fit the side of each cylinder, resulting in poor cooling and heat dissipation effect.

[0057] The structure of cell unit B is similar to that of A, except that the positive electrode connection bar is replaced by a negative electrode connection bar.

[0058] like Figure 6 As shown, the box body 13 includes 5 closed structures, walls 131, 132, 133, 134, 135, which together form a potting chamber. The wall 133 has a positive electrode slot 1334 and a negative electrode slot 1335. The wall 131 has an arc surface structure 1311, and the wall 132 has an arc surface 1321. The arc surface structure matches the cylindrical battery cell side piece to better fix the battery cell unit.

[0059] like Figure 7 As shown, the connecting plate 19 is a wave-shaped structure with an arc surface 191, and the size of the arc surface 191 is equal to the diameter of the battery cell. The connecting plate 19 is located between the battery cell unit A and the battery cell unit B.

[0060] like Figure 8 As shown, the cooling pipe 1226 is a wave-shaped structure, having an arc surface 12261, and the size of the arc surface 12261 is equal to the diameter of the battery core. The cooling pipe 1226 includes water inlet pipe joints 12262 and 12263, and a plug 12264.

[0061] like Fig. 9 As shown, the acquisition board (15) comprises: a signal plug 151, a long acquisition sheet 152, a short acquisition sheet 153, a temperature sensor 154, and a long PCB body 155. The PCB body 155 is provided with a long acquisition sheet, a short acquisition sheet, a temperature sensor and a signal plug in the length direction.

[0062] Embodiment 2 provides a method for assembling a potted battery pack, comprising the following steps:

[0063] Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells are arranged in sequence with an upper and lower staggered arrangement and bonded to both sides of the corresponding arc surface of the cooling tube. Multiple rows of battery cells are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to both sides of the connecting plate to form a whole for standby use;

[0064] Step 2: After the long connecting bars and the insulating plates are assembled, they are assembled together on the front and back sides of the whole as described in step 1;

[0065] Step 3: Connect the long arms of multiple short connecting bars to the notches of the long connecting bars. The ring structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell. The variable cross-section of the long arms matches the shape of the long connecting bars. At this time, the short connecting bars can completely cover the insulating parts of the battery cell. Laser weld the short connecting bars, the positive and negative poles of the cylindrical battery cell, and the long connecting bars to form a battery cell assembly 12.

[0066] Step 4: Assemble the battery cell assembly 12 into the box body 13, and the arc surface on the wall of the box body 13 is matched and bonded with the arc surface of the battery cell assembly;

[0067] Step 6. Finally, pour the potting glue 14 to fill all the gaps between the battery cell assembly 12 and the box body 13 and completely cover the battery cell assembly 12. At this time, part of the cooling tube and part of the positive and negative electrodes of the battery cell assembly are exposed outside, and the rest are wrapped and sealed by the potting glue.

[0068] Embodiment 3 provides a method for assembling a potted battery pack, comprising the following steps:

[0069] Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells are arranged in sequence with an upper and lower staggered arrangement and bonded to both sides of the corresponding arc surface of the cooling tube. Multiple rows of battery cells are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to both sides of the connecting plate to form a whole for standby use;

[0070] Step 2: After the long connecting bars and the insulating plates are assembled, they are assembled together on the front and back sides of the whole as described in step 1;

[0071] Step 3: Connect the long arms of multiple short connecting bars to the notches of the long connecting bars. The ring structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell, and the variable cross-section of the long arms matches the shape of the long connecting bars. At this time, the short connecting bars can completely cover the insulating parts of the battery cell.

[0072] Step 4: Assemble the battery cell assembly 12 into the box body 13, and the arc surface on the wall of the box body 13 is matched and bonded with the arc surface of the battery cell assembly;

[0073] Step 5: Pour the potting glue 14 to fill all the gaps between the battery cell assembly 12 and the box 13, and completely fill it to cover the insulating parts. At this time, since the long connecting bars and the short connecting bars are located higher than the insulating parts, the potting glue 14 will not affect the long connecting bars, the short connecting bars, and the positive and negative poles of the cylindrical battery cells. A part of the cooling tube of the battery cell assembly and a part of the positive and negative poles are exposed to the outside, and the rest are wrapped and sealed by the potting glue. Step 6: Laser weld the short connecting bars, the positive and negative poles of the cylindrical battery cells, and the long connecting bars.

[0074] The main difference between Examples 2 and 3 is that in Example 2, the long connecting bars, short connecting bars, and positive and negative electrodes of the cylindrical battery cells are first welded, and then all of them are potted with potting glue, while in Example 3, potting is first performed to the insulating parts, and then the long connecting bars, short connecting bars, and positive and negative electrodes of the cylindrical battery cells are welded, providing double protection for the insulating parts.

[0075] The above embodiments have described the present invention in detail. However, it should be understood that the detailed description and specific examples, although indicating exemplary embodiments of the present disclosure, are given by way of illustration only, as various changes and modifications within the scope of the present disclosure will be apparent to those skilled in the art based on this detailed description.

Claims

1. A potted battery pack, comprising a cooling tube (1226), a battery cell assembly (12), a box (13), a potting glue (14), a collection board (15) and a connecting board (19), characterized in that: The battery cell assembly (12) is located inside a box (13), the box (13) is filled with a potting glue (14), a cooling pipe (1226) is arranged between the sides of adjacent rows of cylindrical battery cells (1221) and a joint is led out from the left side of the box, the battery cell assembly (12) comprises a battery cell unit A (121), a battery cell unit B (122) and a working row (123), the two battery cell units A / B are electrically connected through the working row (123), a collection board (15) is located above the box (13) and is used to collect parameters of the cylindrical battery cells (1221); the battery cell units A / B each comprise a plurality of upper and lower rows of cylindrical battery cells (1221), the cylindrical battery cells (1221) The core (1221) is an upper and lower bipolar column battery cell. The upper positive pole and the lower negative pole structure of the cylindrical battery cell (1221) are completely the same. The positive and negative poles protrude from the cylindrical battery cell shell respectively. Insulating parts are arranged outside the positive and negative poles. The height of the insulating parts is lower than the positive and negative poles to expose the positive and negative poles. A sealing part is arranged between the positive and negative poles and the insulating parts. The work row (123) includes a long connecting row and a short connecting row located on the front and back sides of the cylindrical battery cell (1221), connecting multiple cylindrical battery cells (1221) in series and parallel and arranged separately. The short connecting row can cover the insulating part of the cylindrical battery cell. The short connecting row is welded to the positive and negative poles of the cylindrical battery cell (1221).

2. The encapsulated battery pack according to claim 1, characterized in that: The long connecting bar (1223) is formed into a square wave structure, having a notch (12231) and a corresponding convex bump (12232); the long connecting bar (1223) is assembled to the front and back sides of the cylindrical battery cell (1221) through an insulating plate (1222); one right end of the long connecting bar (1223) is connected to the positive electrode connecting bar (1225), and the other right end is connected to the negative electrode connecting bar.

3. The potted battery pack according to claim 2, characterized in that: The short connecting row (1224) comprises a ferrule (12241) and a long arm 12242, the long arm and the ferrule surface have a step, the ferrule (12241) is higher than the long arm (12242), the long arm (12242) has a variable cross-section feature, the shape of the long arm (12242) matches the notch (12231) and is welded, the ferrule (12241) exactly matches the shape of the positive and negative poles of the battery cell and is welded, and the long arm (12242) of the short connecting row can completely cover the insulating part protruding from the cylindrical battery cell shell and having a height lower than the positive and negative poles.

4. The potted battery pack according to claim 1, characterized in that: The battery cell units A / B respectively include two upper and lower rows of cylindrical battery cells (1221), and the upper and lower rows of cylindrical battery cells are staggered to save space.

5. The potted battery pack according to claim 4, characterized in that: The battery cell unit A includes 5 battery cell groups arranged from left to right, namely the first group, the second group, ... the fifth group. The first group, the third group and the fifth group have the same structure. Their five battery cells are respectively composed of three battery cells in the upper row and two battery cells in the lower row to form a W shape, and all the cylindrical battery cells have positive poles facing upward. The second group and the fourth group have the same structure. Their five battery cells are respectively composed of two battery cells in the upper row and three battery cells in the lower row to form an M shape, and all the cylindrical battery cells have negative poles facing upward. The rightmost side of the battery cell unit A is the positive electrode connection row (1225), and the left end of the positive electrode connection row (1225) is connected to the working row (123).

6. The encapsulated battery pack according to claim 1 or 3, characterized in that: The potting glue (14) completely pots the sides of all cylindrical battery cells to prevent condensed water from affecting the battery cells, and the potting glue can be potted above the insulating parts to protect the insulating parts from being affected by welding spatter.

7. The potted battery pack according to claim 6, characterized in that: A plurality of short connecting rows are arranged at intervals in the length direction of the long connecting row, and the number of the short connecting rows matches the number of the cylindrical battery cells (1221).

8. The potted battery pack according to claim 6, characterized in that: The box body (13) comprises a five-sided closed structure, wherein the walls (131, 132, 133, 134, 135) together form a potting chamber; the wall body (133) is provided with a positive electrode clamping slot (1334) and a negative electrode clamping slot (1335) structure, which are respectively used for clamping the positive electrode connection row (1225) of the battery cell unit A and the negative electrode connection row of the battery cell unit B; the wall body (131) is provided with an arc surface (1311), and the wall body (132) is provided with an arc surface (1321), and the arc surfaces on the above-mentioned walls match the side surfaces of the cylindrical battery cell to better fix the battery cell unit.

9. The potted battery pack according to claim 6, characterized in that: The connecting plate (19) is a wave-shaped structure having an arc surface (191) whose size is equal to the diameter of the battery cell. The connecting plate (19) is located between the battery cell unit A and the battery cell unit B.

10. The potted battery pack according to claim 6, characterized in that: The cooling pipe (1226) is a wave-shaped structure having a circular arc surface (12261) whose size is equal to the diameter of the battery core; the cooling pipe (1226) includes a water inlet pipe joint (12262, 12263) and a plug (12264).

11. The potted battery pack according to claim 6, characterized in that: The acquisition board (15) comprises: a signal plug (151), a long acquisition sheet (152), a short acquisition sheet (153), a temperature sensor (154), and a long PCB body (155); the long PCB body (155) is provided with the long acquisition sheet, the short acquisition sheet, the temperature sensor, and the signal plug in the length direction.

12. A method for manufacturing a potted battery pack according to any one of claims 1 to 7, comprising the following steps: Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells (1221) are arranged in sequence with an upper and lower staggered arrangement and bonded to two sides of the corresponding arc surface on the cooling tube, the multiple rows of cylindrical battery cells (1221) are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to two sides of the connecting plate to form a whole for standby use; Step 2: After the long connecting bar and the insulating plate are assembled, they are assembled together to the front and back sides of the whole described in step 1; Step 3, connecting the long arms of the plurality of short connecting bars to the notches of the long connecting bars, the ferrule structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell, and the variable cross-section of the long arms matches the shape of the long connecting bars, so that the short connecting bars can completely cover the insulating parts of the battery cell, and laser welding the short connecting bars, the positive and negative poles of the cylindrical battery cell and the long connecting bars to form a battery cell assembly (12); Step 4: Assemble the battery cell assembly (12) into the box (13), and bond the arc surface of the wall of the box (13) to the arc surface of the battery cell assembly; Step 6. Finally, pour the potting glue (14) to fill all the gaps between the battery cell assembly (12) and the box (13) and completely cover the battery cell assembly (12). At this time, part of the cooling tube and part of the positive and negative electrodes of the battery cell assembly are exposed outside, and the rest are wrapped and sealed by the potting glue.

13. A method for manufacturing a potted battery pack according to any one of claims 1 to 7, comprising the following steps: Step 1: In the battery cell unit A or B, multiple rows of cylindrical battery cells (1221) are arranged in sequence with an upper and lower staggered arrangement and bonded to two sides of the corresponding arc surface on the cooling tube, the multiple rows of cylindrical battery cells (1221) are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to two sides of the connecting plate to form a whole for standby use; Step 2: After the long connecting bar and the insulating plate are assembled, they are assembled together to the front and back sides of the whole described in step 1; Step 3: Connect the long arms of multiple short connecting bars to the notches of the long connecting bars. The ring structure of the short connecting bars matches the shape of the positive and negative poles of the battery cell, and the variable cross-section of the long arms matches the shape of the long connecting bars. At this time, the short connecting bars can completely cover the insulating parts of the battery cell. Step 4: Assemble the battery cell assembly (12) into the box (13), and bond the arc surface of the wall of the box (13) to the arc surface of the battery cell assembly; Step 5: Pour the potting glue (14) to fill all the gaps between the battery cell assembly (12) and the box (13), and completely fill it to cover the insulating parts. At this time, since the positions of the long connecting bars and the short connecting bars are higher than the insulating parts, the potting glue (14) will not affect the long connecting bars, the short connecting bars, and the positive and negative poles of the cylindrical battery cell; a part of the cooling tube of the battery cell assembly and a part of the positive and negative poles are exposed to the outside, and the rest are wrapped and sealed by the potting glue. Step 6: Laser weld the short connecting bars, the positive and negative poles of the cylindrical battery cells, and the long connecting bars.

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