Encapsulated battery pack

Abstract

The utility model relates to a potting battery pack, which 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 working bar, and the two battery cell units A and B are electrically communicated through the working bar; the battery cell units A / B comprise 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 to protect the insulating part from being influenced by welding spatter. 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 potting battery pack. BACKGROUND

[0002] Energy storage battery pack as a common energy storage unit of power grid has high energy density and long service life. Small capacity cylindrical cells are usually connected in series and parallel to meet the total energy requirement as the smallest energy unit of the battery pack. A large amount of heat is generated during the use of the cells, so the battery pack is equipped with a cooling system for thermal management of the cells. The energy storage battery pack is installed in a common container cabinet and generally does not have a dehumidifying device. When the battery pack is cooled, condensate water is easily generated.

[0003] The positive and negative poles of the existing cylindrical cell are located on the same side, the connection row is connected with the cell, and single-sided welding is performed, that is, the positive and negative poles of the connection row and the cell are welded on the same side. For example, the battery pack of Tesla, the cell adopts a cylindrical cell, a plurality of cells are connected in series and parallel, and a serpentine cooling pipe is located on the side of the cylindrical cell. The cell connection row is on one side, and laser welding is used to realize the connection between the connection row and the cell. When single-sided welding is performed, the positive and negative poles of the connection row and the cell on the same side are connected, the connection mode is laser welding, and the positive (negative) end of the cell is provided with an insulating piece. When laser welding is performed between the aluminum row and the cell, there is more or less spatter, the distance between the spatter and the insulating piece is close, the temperature of the spatter exceeds 600 degrees, and the spatter on the insulating piece may burn the sealing ring, seriously burn, and cause the insulating piece to fail, resulting in cell leakage and causing a safety accident. The above-mentioned single-sided welding connection row cannot be applied to the cylindrical cell with upper and lower positive and negative poles. When the cell is cooled, the condensate water has an effect on the positive and negative poles, which may cause a short circuit of the battery.

[0004] In CN117374520A, the positive end 201 and the negative end 202 of the cylindrical cell are located on the top, the negative output row 10a and the positive output row 10b are located on the top of the cell, and the welding spatter will affect the insulating piece near the pole when the positive and negative poles are welded. Moreover, the patent does not provide a cooling assembly, and the patent CN113764832A is similar to the above-mentioned patent and is also single-sided welding. The first connection row 10 is an integral structure, which not only improves the structural strength of the first connection row 10, prolongs the service life of the first connection row 10, but also makes the processing of the first connection row 10 easier, simpler, reduces the processing cost and difficulty of the connection row assembly, and the patent does not mention the effect of welding spatter. Actually, the structure of the connection row body cannot prevent the effect of welding spatter on the insulating piece.

[0005] In CN104733669B, the connection row is double-sided welded, a positive terminal Btp is formed at one end of each battery Bt in the axial direction, and a negative terminal Btn is formed at the other end, the battery rows BG(1) and BG(3) are arranged with the positive terminals Btp facing the upper side, the battery rows BG(2) and BG(4) are arranged with the positive terminals Btp facing the lower side, the first busbar retaining member 40 retains three busbars, i.e., the positive busbar 41, the connecting busbar 42, and the negative busbar 43, which are composed of a metal sheet, each busbar is formed with a terminal opening 41h, 42h, or 43h, and the positive terminal Btp or the negative terminal Btn of the battery Bt is exposed from the terminal opening 41h, 42h, or 43h. Each busbar plate is a whole plate with a hole in the middle to expose the terminal of the battery, and the battery terminal and the busbar plate are connected by wiring 81 / 82. This kind of busbar plate structure cannot cover the insulating member to prevent welding spatter, and it is not convenient to match the tolerance of the terminals of the batteries in a row, which is not conducive to the arrangement of each battery cell. In addition, it is cooled by cooling gas and does not involve the elimination of condensed water. CN110137423A patent is similar to CN104733669B. SUMMARY

[0006] To solve the technical problems of single-sided welding of the connection row, which is easy to produce spatter and affect the exposed insulating member near the pole column, and the condensation pipe, which is easy to produce condensed water and affect the side of the battery cell, a potting battery pack and a manufacturing method thereof are provided, which can protect the exposed insulating member and prevent the condensed water from affecting the side of the battery cell.

[0007] TECHNICAL SOLUTION

[0008] In one aspect of the present disclosure, a potting battery pack is provided, which includes a cooling pipe, a battery cell assembly, a box, potting glue, a collection plate, and a connection plate. The battery cell assembly is located inside the box, the inside of the box is filled with potting glue, the cooling pipe is arranged between the sides of adjacent rows of cylindrical battery cells and leads out a joint from the left side of the box, the battery cell assembly includes battery cell units A and B and a work row, the two battery cell units A / B are electrically connected through the work row, and the collection plate is located above the box for collecting parameters of the cylindrical battery cells. The battery cell units A / B include a plurality of rows of cylindrical battery cells arranged in an up-down manner, the cylindrical battery cells are bipolar cylindrical battery cells, the upper end positive pole and the lower end negative pole of the cylindrical battery cell have the same structure, the positive and negative poles protrude from the cylindrical battery cell shell, the positive and negative poles are sleeved with insulating members, the height of the insulating members is lower than that of the positive and negative poles to expose the positive and negative poles, and a sealing member is arranged between the positive and negative poles and the insulating members. The work row includes long connection rows and short connection rows arranged separately on the front and back of the cylindrical battery cells, the short connection rows can cover the insulating members of the cylindrical battery cells.

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

[0010] Preferably, the short connecting row comprises a sleeve ring and a long arm, the long arm and the sleeve ring have a certain step, the sleeve 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, and the sleeve ring is welded with the positive and negative cylindrical shape of the battery cell. The long arm 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.

[0011] Preferably, the battery cell unit A / B respectively comprises two rows of cylindrical battery cells arranged above and below, and the two rows of cylindrical battery cells are placed in staggered positions to save space.

[0012] Preferably, the battery cell unit A comprises five groups of battery cells arranged from left to right in sequence, 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 the five battery cells are composed of three battery cells located in the upper row and two battery cells located in the lower row in W shape, and all the cylindrical battery cells have positive poles upward, the second group and the fourth group have the same structure, and the five battery cells are composed of two battery cells located in the upper row and three battery cells located in the lower row in M shape, and all the cylindrical battery cells have negative poles upward, the leftmost side of the battery cell unit A is a positive pole row, and the left end of the positive pole row is connected to the connecting row.

[0013] Preferably, the potting glue completely fills the side surfaces of all the cylindrical battery cells to prevent the influence of condensed water on the battery cells, and the potting glue can be filled above the insulating part to protect the insulating part from the influence of welding splashes.

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

[0015] Preferably, the cuboid box body comprises a 5-face closed structure which together constitutes a potting chamber; the wall body has a positive pole slot and a negative pole slot structure; the wall body has a circular arc surface, and the circular 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 wave-shaped structure with a third circular arc surface, and the size of the third circular arc surface is equal to the diameter of the battery cell; 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 a fourth circular arc surface, and the size of the fourth circular arc surface is equal to the diameter of the battery cell; the cooling pipe comprises a water inlet pipe joint and a plug.

[0018] Preferably, the collection plate comprises: a signal plug, a long collection sheet, a short collection sheet, a temperature sensor, and a long strip PCB body; the PCB body is provided with the long collection sheet, the short collection sheet, the temperature sensor, and the signal plug in the length direction.

[0019] In another aspect of the present disclosure, a battery pack housing structure including at least one battery pack is provided.

[0020] In another aspect of the present disclosure, a vehicle is provided, the vehicle including the battery pack housing structure, and a longitudinal direction of the at least one battery pack can be arranged to be approximately perpendicular to a length direction of the vehicle, such that the side structure unit provides protection for the plurality of battery cells during a front collision or a rear collision of the vehicle.

[0021] Preferably, the plurality of battery cells can be compressed in a height direction of a cylindrical can of each of the plurality of battery cells.

[0022] In another aspect of the present disclosure, a manufacturing method of a potting battery pack is provided, including the following steps:

[0023] Step one, in the cell unit A or B, a plurality of rows of cylindrical cells are placed in an up-down staggered manner and arranged in sequence and bonded to both sides of the corresponding fourth arc surface of the cooling pipe, the plurality of rows of cells are bonded to the cooling pipe, and the cell units A and B are respectively bonded to both sides of the connecting plate to form an integral whole for standby;

[0024] Step two, after the long connecting row and the insulating plate are assembled, they are assembled together on the top and bottom of the integral whole of step one;

[0025] Step three, the long arm of the plurality of short connecting rows is connected to the notch of the long connecting row, the sleeve ring structure of the short connecting row matches the shape of the positive and negative cylindrical poles of the cell, and the variable cross section of the long arm matches the shape of the long connecting row, at this time, the short connecting row can completely cover the insulating member of the cell, and the short connecting row, the positive and negative poles of the cylindrical cell, and the long connecting row are laser welded to form a cell assembly;

[0026] Step four, the cell assembly is assembled into the box, and the arc surface of the wall of the box is matched and bonded to the arc surface of the cell assembly;

[0027] Step six, finally, pour in the potting glue to fill all the gaps between the cell assembly and the box, and completely cover the cell assembly, at this time, a part of the cell assembly and a part of the positive and negative pole row are exposed outside, and the others are wrapped and sealed by the potting glue.

[0028] In yet another aspect of the present disclosure, a manufacturing method of a potting battery pack is provided, including the following steps:

[0029] Step one, in the cell unit A or B, the multiple rows of cylindrical cells are placed in an up-down staggered manner and are arranged in sequence and bonded to the corresponding fourth arc surface on both sides of the cooling pipe. The multiple rows of cells are bonded to the cooling pipe, and the cell units A and B are bonded to the two sides of the connecting plate to form a whole for standby;

[0030] Step two, after the long connecting row and the insulating plate are assembled, they are assembled together on the top and bottom of the whole in step one;

[0031] Step three, connect the long arm of the multiple short connecting rows with the notch of the long connecting row. The sleeve ring structure of the short connecting row matches the shape of the positive and negative cylindrical poles of the cell, and the variable cross-section of the long arm matches the shape of the long connecting row. At this time, the short connecting row can completely cover the insulating part of the cell;

[0032] Step four, assemble the cell assembly into the box. The arc surface on the wall of the box matches and is bonded to the arc surface of the cell assembly;

[0033] Step five, pour in the potting adhesive to fill all the gaps between the cell assembly and the box, and completely fill the insulating part. At this time, since the position of the long connecting row and the short connecting row is higher than the insulating part, the potting adhesive will not affect the long connecting row, the short connecting row, and the positive and negative cylindrical poles. A part of the cell assembly and a part of the positive and negative pole row are exposed outside, and the others are wrapped and sealed by the potting adhesive.

[0034] Step six, laser weld the short connecting row, the positive and negative poles of the cylindrical cell, and the long connecting row.

[0035] Beneficial effects

[0036] According to the above various embodiments, the bipolar pole with the same structure on the cylindrical cell is arranged, the insulating part is located outside the shell and is lower than the positive and negative poles, the double-sided welding is provided, the structure of the work row is arranged, and the pouring height of the potting adhesive is provided. Good foundation, double-sided welding makes it possible to pour to the horizontal position of the insulating part, and therefore the pouring height can protect the insulating part, and the potting adhesive can pour all the side surfaces of the cylindrical cell, which can eliminate the influence of condensed water on the cylindrical cell and improve the service life of the cylindrical cell.

[0037] Furthermore, compared to a monolithic design, the separate long and short connecting bars help ensure a stable match between the rings of each connecting bar and the terminal shape of each cylindrical cell within tolerance limits. The connecting bars not only assist in fixing the cells but also ensure coverage of the insulation components, facilitating assembly and subsequent welding, and improving weld quality. The matching and fixing of the connecting bars to the cylindrical cell terminals also facilitates the installation of cooling pipes that perfectly conform to the outer shape of the cylindrical cells, improving the cooling effect of the cooling pipes. Therefore, the bipolar cylindrical cells, double-sided welding, potting, and the separate long and short connecting bars complement each other, jointly strengthening the protection of the insulation components and keeping the cells dry to prevent the effects of condensation. Attached Figure Description

[0038] The accompanying drawings illustrate exemplary embodiments of this disclosure and, together with the foregoing disclosure, are intended to provide a further understanding of the technical features of this disclosure; therefore, this disclosure is not to be construed as limited to the drawings.

[0039] Figure 1 This is a diagram of the potting module.

[0040] Figure 2 It is the internal structure of the potting module after the potting compound has been removed.

[0041] Figure 3 This is a front view of the battery cell assembly.

[0042] Figure 4 This is a reverse view of the battery cell assembly.

[0043] Figure 5 This is a structural diagram of cell unit A.

[0044] Figure 6 This is a structural diagram of the box.

[0045] Figure 7 This is a structural diagram of the connecting plate.

[0046] Figure 8 This is a structural diagram of the cooling pipe.

[0047] Figure 9 This is a structural diagram of the acquisition board.

[0048] Figure 10 This is a structural diagram of a long busbar.

[0049] Figure 11 This is a structural diagram of a short busbar.

[0050] Figure 12 This is a structural diagram of the insulating board. Detailed Implementation

[0051] This disclosure will become more apparent from the detailed description of embodiments thereof with reference to the accompanying drawings. It should be understood that the embodiments disclosed herein are illustrative and intended only for a better understanding of this disclosure, and that this disclosure can be modified in various ways. Furthermore, for ease of understanding, the drawings are not drawn to scale, but the dimensions of some components may be exaggerated.

[0052] Example 1: See Figure 1 and Figure 2 As shown, a potted battery pack includes: a cooling pipe 11, a cell assembly 12, a housing 13, potting compound 14, a data acquisition board 15, and a connecting plate 19. The cell assembly 12 is located inside the housing 13, which is filled with potting compound 14. The cooling pipe 11 is positioned between the sides of adjacent rows of cylindrical cells and extends from the left side of the housing. (See also...) Figures 3-4 The battery cell assembly 12 includes battery cell unit A 121, battery cell unit B 122, and work bar 123. The two battery cell units A / B are electrically connected through the work bar 123. The acquisition board (15) is located above the housing 13 for acquiring the parameters of the connection bar.

[0053] See Figures 3-5 The cell unit A comprises: several rows, preferably two rows, of cylindrical cells 1221, staggered between adjacent rows to save space. The cylindrical cells targeted in this application are specialized bipolar cylindrical cells, in which the upper end (positive electrode) and lower end (negative electrode) of the cylindrical cell have identical structures. The positive and negative electrodes protrude from the cylindrical cell shell, and an insulating component is fitted over the positive and negative electrodes. A sealing component is provided between the positive and negative electrodes and the insulating component. Compared with cells with positive and negative electrodes on the same side, this cell structure can better block the positive and negative electrodes, providing a basis for double-sided welding of the connecting bar. Furthermore, when welding cells with positive and negative electrodes on the same side to a single-sided connecting bar, the connecting bar must weld both the relatively high protruding positive electrode and the relatively low negative electrode shell. Therefore, potting compound cannot be potted to the upper surface of the shell. However, for cells with double-sided electrodes and double-sided welding of the connecting bar, potting compound can be potted to the upper surface of the shell and even to the insulating component protruding from the shell. This can protect the insulating component from the influence of welding slag to a certain extent.

[0054] like Figures 3-5As shown in the middle, the cell unit A is arranged in five groups from left to right, in turn, the first group, the second group, …, the fifth group, the first group, the third group and the fifth group have the same structure, and the five cells are composed of three cells in the upper row and two cells in the lower row in W shape, and all the positive poles of the cylindrical cells are upward, the second group and the fourth group have the same structure, and the five cells are composed of two cells in the upper row and three cells in the lower row in M shape, and all the negative poles of the cylindrical cells are upward, the leftmost side of the cell unit A is a positive connection row, the leftmost side of the cell unit B is a negative connection row, and the left ends of the positive and negative connection rows are connected to the work row.

[0055] The work row 123 includes an insulating plate 1222, a long connection row 1223, a short connection row 1224, and a positive connection row 1225 connected to the right end of the work row. The structure of the long connection row 123 includes a notch 12231 and a corresponding convex 1224. The structure of the short connection row 1224 includes a sleeve ring 12241 and a long arm 12242, and the long arm and the sleeve ring have a certain step, the sleeve ring 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 sleeve ring 12241 matches the shape of the positive and negative cylindrical poles of the cell and is welded, and the short connection row can completely cover the insulating part of the cell to protect the insulating part, so that the insulating part is protected by the double protection of the sealing glue and the short connection row.

[0056] The long connection row and the short connection row arranged separately are helpful to the stable matching of the work row and the pole of each cylindrical cell within the tolerance range, the work row can assist in fixing the cell and ensure that the insulating part is covered, which is convenient for later welding and improves the welding quality. The matching and fixing of the connection row and the cylindrical cell pole are also helpful to the installation of the cooling pipe which completely matches the shape of the outer side of the cylindrical cell, and improve the cooling effect of the cooling pipe. The whole plate design obviously cannot match the shape of the positive and negative poles of the work row and the multiple rows of cylindrical cells, cannot guarantee that each insulating part is covered, and cannot guarantee that the serpentine cooling pipe can perfectly match the side of each cylindrical cell, resulting in poor cooling and heat dissipation effect.

[0057] The structure of the cell unit B is similar to that of A, except that the negative connection row is used instead of the positive connection row.

[0058] As Figure 6As shown, the box 13 comprises a 5-face closed structure, comprising wall body one 131, wall body two 132, wall body three 133, wall body four 134, wall body five 135, wall body one 131, wall body two 132, wall body three 133, wall body four 134, wall body five 135 together constitute a potting chamber. Wall body three 133 has a positive slot 1334 and a negative slot 1335 structure. Wall body one 131 has a first arc surface structure 1311, and wall body two 132 has a second arc surface 1321. The arc surface structure matches the side piece of the cylindrical battery cell to better fix the battery cell unit.

[0059] As shown, Figure 7 The connecting plate 19 is a wave-shaped structure with a third arc surface 191, and the size of the third 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] As shown, Figure 8 The cooling pipe 1226 is a wave-shaped structure with a fourth arc surface 12261, and the size of the fourth arc surface 12261 is equal to the diameter of the battery cell. The cooling pipe 1226 includes water inlet pipe joints 12262 and 12263, and a plug 12264.

[0061] As shown, Figure 9 The collection plate (15) comprises: a signal plug 151, a long collection piece 152, a short collection piece 153, a temperature sensor 154, and a long strip PCB body 155. The PCB body 155 is provided with a long collection piece, a short collection piece, a temperature sensor, and a signal plug in the length direction.

[0062] Embodiment 2 provides an assembly method of a potting battery pack, comprising the following steps:

[0063] Step one, in the battery cell unit A or B, the multiple rows of cylindrical battery cells are placed in an up-down staggered manner and are sequentially arranged and bonded to the two sides of the corresponding fourth arc surface of the cooling pipe. The multiple rows of battery cells are bonded to the cooling pipe. The battery cell unit A and B are bonded to the two sides of the connecting plate to form a whole for standby;

[0064] Step two, after the long connecting row and the insulating plate are assembled, they are assembled together to the front and back of the whole of step one;

[0065] Step three, connect the long arm of the multiple short connecting rows with the notch of the long connecting row. The sleeve ring structure of the short connecting row matches the cylindrical shape of the positive and negative poles of the battery cell, and the variable cross section of the long arm matches the shape of the long connecting row. At this time, the short connecting row can completely cover the insulating part of the battery cell. Laser weld the short connecting row, the positive and negative poles of the cylindrical battery cell, and the long connecting row to form a battery cell assembly 12;

[0066] Step four, assemble the battery cell assembly 12 into the box 13, and bond the arc surface on the wall body of the box 13 with the arc surface of the battery cell assembly.

[0067] Step six, pour in the potting glue 14, fill all the gaps between the battery assembly 12 and the box 13, and completely cover the battery assembly 12, at this time the battery assembly out of the cooling tube part and the positive and negative pole row part are exposed outside, and the others are wrapped and sealed by the potting glue.

[0068] Embodiment 3 provides an assembly method of a potting battery pack, comprising the following steps:

[0069] Step one, in the battery cell unit A or B, the multiple rows of cylindrical battery cells are placed in an up-down staggered manner and sequentially arranged and bonded to the two sides of the corresponding fourth circular arc surface of the cooling tube, the multiple rows of battery cells are bonded to the cooling tube, and the battery cell units A and B are respectively bonded to the two sides of the connecting plate to form an integral body for standby;

[0070] Step two, after the long connecting row and the insulating plate are assembled, they are assembled together to the front and back of the integral body in step one;

[0071] Step three, the long arm of the multiple short connecting rows is connected to the notch of the long connecting row, the sleeve ring structure of the short connecting row is matched with the shape of the positive and negative cylindrical poles of the battery cell, and the variable cross section of the long arm is matched with the shape of the long connecting row, at this time the short connecting row can completely cover the insulating member of the battery cell;

[0072] Step four, the battery assembly 12 is assembled into the box 13, and the arc surface on the wall of the box 13 is matched and bonded to the arc surface of the battery assembly;

[0073] Step five, pour in the potting glue 14, fill all the gaps between the battery assembly 12 and the box 13, and completely fill the insulating member to cover the insulating member, at this time since the positions of the long connecting row and the short connecting row are higher than the insulating member, the potting glue 14 will not affect the long connecting row, the short connecting row, and the positive and negative cylindrical poles of the battery cell; the battery assembly out of the cooling tube part and the positive and negative pole row part are exposed outside, and the others are wrapped and sealed by the potting glue.

[0074] Step six, laser weld the short connecting row, the positive and negative cylindrical poles of the battery cell, and the long connecting row.

[0075] The main difference between embodiments 2 and 3 is that in embodiment 2, the long connecting row, the short connecting row, and the positive and negative cylindrical poles of the battery cell are welded first, and then the potting glue is completely poured in for sealing, while in embodiment 3, the potting is performed first, the potting glue is poured to the insulating member, and then the long connecting row, the short connecting row, and the positive and negative cylindrical poles of the battery cell are welded, which provides double protection for the insulating member.

[0076] The above embodiments have described the present application in detail. However, it should be understood that the detailed description and specific examples, although indicating example embodiments of the present disclosure, are given only by way of illustration, since various changes and modifications within the scope of the present disclosure will be apparent to those skilled in the art based on the present detailed description.

Claims

1. A potted battery pack, the battery pack comprising a cooling pipe (1226), a cell assembly (12), a box (13), a potting glue (14), a collecting plate (15) and a connecting plate (19), characterized in that, The battery cell assembly (12) is located inside the box (13), the box (13) is filled with potting glue (14), the cooling pipe (1226) is arranged between the side surfaces of adjacent rows of cylindrical battery cells (1221) and 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 work row (123), the two battery cell units A / B are electrically connected through the work row (123), and a collection plate (15) is located above the box (13) and is used for collecting parameters of the cylindrical battery cells (1221); the battery cell units A / B comprise a plurality of rows of cylindrical battery cells (1221) arranged in an upper and lower manner, the cylindrical battery cells (1221) are bipolar cylindrical battery cells, the upper end positive electrode and the lower end negative electrode of the cylindrical battery cells (1221) have the same structure, the positive and negative electrode poles protrude from the cylindrical battery cell shell respectively, the positive and negative electrode poles are provided with an insulating member, the height of the insulating member is lower than that of the positive and negative electrode poles so that the positive and negative electrode poles are exposed, and a sealing member is arranged between the positive and negative electrode poles and the insulating member; the work row (123) comprises a long connecting row and a short connecting row which are arranged separately and are arranged on the front and back surfaces of the cylindrical battery cells (1221) and are connected in series and in parallel to a plurality of cylindrical battery cells (1221), the short connecting row can cover the insulating member of the cylindrical battery cell, and the short connecting row is welded to the positive and negative electrode poles of the cylindrical battery cells (1221).

2. The potted battery pack of claim 1, wherein, The long connecting row (1223) is formed in a square wave structure and has a notch (12231) and a corresponding convex (12232), the long connecting row (1223) is assembled to the front and back surfaces of the cylindrical battery cells (1221) through an insulating plate (1222), and one end of the right end of the work row (123) is connected to the positive electrode connecting row (1225) and the other end of the right end is connected to the negative electrode connecting row.

3. The potted battery pack of claim 2, wherein, The short connecting row (1224) comprises a sleeve ring (12241) and a long arm (12242), the long arm and the sleeve ring have a step, the sleeve ring (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 sleeve ring (12241) is matched with the positive and negative electrode poles of the battery cell and is welded, and the long arm (12242) of the short connecting row can completely cover the insulating member which protrudes from the cylindrical battery cell shell and has a height lower than that of the positive and negative electrode poles.

4. The potted battery pack of claim 1, wherein, The battery cell units A / B respectively comprise two rows of cylindrical battery cells (1221) arranged in an upper and lower manner, and the two rows of cylindrical battery cells are arranged in a staggered manner to save space.

5. The potted battery pack of claim 4, wherein, The battery cell unit A comprises five small groups of battery cells arranged from left to right in sequence, namely a first group, a second group, a third group, a fourth group and a fifth group, the first group, the third group and the fifth group have the same structure, five battery cells of the first group, the third group and the fifth group are composed of three battery cells arranged in an upper row and two battery cells arranged in a lower row in a W shape, and all the positive electrodes of the cylindrical battery cells face upward, the second group and the fourth group have the same structure, five battery cells of the second group and the fourth group are composed of two battery cells arranged in an upper row and three battery cells arranged in a lower row in an M shape, and all the negative electrodes of the cylindrical battery cells face upward, and the rightmost side of the battery cell unit A is provided with the positive electrode connecting row (1225), and the left end of the positive electrode connecting row (1225) is connected to the work row (123).

6. The potted battery pack according to claim 1 or 3, characterized by, The potting glue (14) completely fills all the side surfaces of the cylindrical battery cells, prevents the influence of condensed water on the battery cells, and can be filled above the insulating member to protect the insulating member from welding splashes.

7. The potted battery pack of claim 6, wherein, The 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 of claim 6, wherein, The box (13) comprises a 5-face closed structure, including wall body one (131), wall body two (132), wall body three (133), wall body four (134), and wall body five (135), which together form a potting chamber; the wall body three (133) is provided with a positive electrode clamping groove (1334) and a negative electrode clamping groove (1335) structure, which are respectively used for the positive electrode connecting row (1225) of the battery cell unit A and the negative electrode connecting row of the battery cell unit B; the wall body one (131) is provided with a first circular arc surface (1311), and the wall body two (132) is provided with a second circular arc surface (1321); the circular arc surfaces on the wall body one and the wall body two match the side surface of the cylindrical battery cell to better fix the battery cell unit.

9. The potted battery pack of claim 6, wherein, The connecting plate (19) is a wave-shaped structure, provided with a third circular arc surface (191) with a size equal to the diameter of the battery cell, and is located between the battery cell unit A and the battery cell unit B.

10. The potted battery pack according to claim 6, characterized by, The cooling pipe (1226) is a wave-shaped structure, provided with a fourth circular arc surface (12261) with a size equal to the diameter of the battery cell; the cooling pipe (1226) comprises a water inlet pipe joint (12262, 12263) and a plug (12264).

11. The potted battery pack of claim 6, wherein, The collection plate (15) comprises a signal plug (151), a long collection piece (152), a short collection piece (153), a temperature sensor (154), and a long strip PCB body (155); the long strip PCB body (155) is provided with the long collection piece, the short collection piece, the temperature sensor, and the signal plug in the length direction.

Images