Battery pack assembling method and battery pack

Abstract

The invention provides a battery pack assembling method and a battery pack. The battery pack assembling method comprises the following steps: respectively putting a cold plate mold assembly and a battery cell into a forming space defined by an inner side wall in a lower battery box body and a baffle plate, and reserving filling gaps between the inner side wall of the lower battery box body and the cold plate mold assembly, between the baffle plate and the cold plate mold assembly, and between the cold plate mold assembly and the battery cell; a forming agent is poured into the forming space, and the filling gap is filled with the forming agent; and after the poured forming agent is solidified, the cold plate mold assembly is taken out to form the battery pack with the battery cold plate, the solidified forming agent forms a shell of the battery cold plate, and a space formed after the cold plate mold assembly is taken out forms a cooling runner of the battery cold plate. The problems that in the prior art, a battery pack cold plate is difficult to assemble and poor in heat exchange effect are solved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack assembly method and a battery pack. Background Art

[0002] With the popularization and development of fast charging technology for new energy vehicles, the potential risk of thermal runaway caused by the rapid increase in battery temperature during fast charging has received more and more attention. Using cold plates for large-surface cooling is an effective measure to deal with high-rate fast charging, but traditional cold plates are not only cumbersome to install but also have poor contact with the battery cells, resulting in low volume utilization, low energy density of the whole package, and poor assembly or production feasibility.

[0003] Therefore, the prior art has the problems of difficulty in assembling the cold plate of the battery pack and poor heat exchange effect. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery pack assembly method and a battery pack to solve the problems of difficult assembly of a cold plate of a battery pack and poor heat exchange effect in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a battery pack assembly method is provided, comprising: placing a cold plate mold assembly and a battery cell into a molding space surrounded by an inner wall and a baffle in a lower battery box, respectively, and reserving filling gaps between the inner wall of the lower battery box and the cold plate mold assembly, between the baffle and the cold plate mold assembly, and between the cold plate mold assembly and the battery cell; pouring a molding agent into the molding space and filling the filling gap with the molding agent; after the poured molding agent is solidified, taking out the cold plate mold assembly to form a battery pack with a battery cold plate, wherein the solidified molding agent forms a shell of the battery cold plate, and the space after the cold plate mold assembly is taken out forms a cooling channel of the battery cold plate.

[0006] Furthermore, the cold plate mold assembly includes two liquid collecting tube molds and multiple harmonica tube molds, the extension direction of the liquid collecting tube mold and the extension direction of the harmonica tube mold are perpendicular to each other, the multiple harmonica tube molds are arranged between the two liquid collecting tube molds at intervals, and the two ends of the multiple harmonica tube molds are respectively connected to the two liquid collecting tube molds; when the cold plate mold assembly and the battery cells are respectively placed in the molding space, the battery cells are arranged in the accommodating space formed between the liquid collecting tube mold and the harmonica tube mold, and filling gaps are arranged between the harmonica tube mold and adjacent battery cells, and between the liquid collecting tube mold and adjacent battery cells.

[0007] Furthermore, the baffle has a liquid inlet and a liquid outlet. When the cold plate mold assembly and the battery cell are respectively placed in the molding space, the end of the liquid collecting tube mold close to the baffle abuts against the baffle, and the abutting surface of one of the liquid collecting tube molds covers the liquid inlet, and the abutting surface of the other liquid collecting tube mold covers the liquid outlet.

[0008] Furthermore, a connecting protrusion is provided at the end of the liquid collecting tube mold close to the baffle. In the process of placing the cold plate mold assembly into the molding space, the connecting protrusions at the ends of the two liquid collecting tube molds of the cold plate mold assembly are respectively arranged corresponding to the liquid inlet and liquid outlet of the baffle. After the cold plate mold assembly is taken out, the connecting protrusions of the two liquid collecting tube molds respectively form the liquid inlet and liquid outlet of the battery cold plate.

[0009] Furthermore, each harmonica tube mold includes at least one spacer bar spaced apart along the height direction of the battery, and both ends of each spacer bar are respectively connected to different liquid collecting pipe molds to form at least one cooling channel.

[0010] Furthermore, a plurality of characteristic grooves spaced apart along the length direction are provided on the collecting tube mold; the characteristic grooves are connected to the harmonica tube mold one by one, the ends of the harmonica tube mold are connected to the bottom surfaces of the characteristic grooves, and a filling gap is reserved between the harmonica tube mold and the side walls of the characteristic grooves.

[0011] Furthermore, the step of pouring the molding agent into the molding space and filling the gap with the molding agent includes: before pouring the molding agent into the molding space, installing a plug at the liquid outlet to seal the liquid outlet; installing a plug at the liquid inlet to seal the liquid inlet; in the process of pouring the molding agent into the molding space, stop pouring the molding agent after the height of the molding agent in the molding space exceeds the height of the cold plate mold assembly; after the molding agent is solidified, remove the plug in the liquid inlet hole and the plug in the liquid outlet hole.

[0012] Furthermore, the material of the cold plate mold assembly is a phase-changeable material or a thermally decomposable resin, and the phase change temperature of the phase-changeable material is lower than the softening temperature of the cured molding agent, and the thermal decomposition temperature of the thermally decomposable resin is lower than the softening temperature of the cured molding agent; the process of removing the cold plate mold assembly from the battery cold plate includes: heating the cold plate mold assembly in the battery cold plate to melt or thermally decompose it, and let it flow out of the battery cold plate.

[0013] Furthermore, during the process of taking out the cold plate mold assembly from the battery cold plate: after the cold plate mold assembly is melted, a cleaning medium is introduced into the battery cold plate to discharge the melted material or thermal decomposition material of the cold plate mold assembly from the battery cold plate.

[0014] According to another aspect of the present invention, a battery pack is further provided. The battery pack is manufactured by the above-mentioned battery pack assembly method.

[0015] Applying the technical solution of the present invention, the battery pack assembly method in the present application includes: placing the cold plate mold assembly and the battery cell into a molding space surrounded by the inner wall and the baffle in the lower battery box, and reserving filling gaps between the inner wall of the lower battery box and the cold plate mold assembly, between the baffle and the cold plate mold assembly, and between the cold plate mold assembly and the battery cell; pouring a molding agent into the molding space and filling the filling gap with the molding agent; after the poured molding agent is solidified, taking out the cold plate mold assembly to form a battery pack with a battery cold plate, wherein the solidified molding agent forms the shell of the battery cold plate, and the space after the cold plate mold assembly is taken out forms the cooling channel of the battery cold plate.

[0016] When the battery pack assembly method in the present application is used to make a battery cold plate, the battery lower box and the battery cell can be selected according to the preset requirements, and the corresponding cold plate mold assembly can be made or selected according to the size of the battery lower box and the specifications of the battery cell, and after the cold plate mold assembly is made or selected, the cold plate mold assembly and the battery cell are respectively placed in the molding space surrounded by the inner wall and baffle of the battery lower box, and a filling gap is reserved between the inner wall of the battery lower box and the cold plate mold assembly, between the baffle and the cold plate mold assembly, and between the cold plate mold assembly and the battery cell, so that the molding agent can be poured into the filling gap, and the molding agent wraps at least a part of the cold plate mold assembly and the battery cell, so as to form the required battery cold plate after the molding agent is cooled. Finally, the cold plate mold assembly is taken out to form the cooling channel of the battery cold plate. Therefore, in the present application, by using a cold plate mold assembly and a molding agent in the battery lower case to form a battery cold plate and a cooling channel inside the battery cold plate, it is possible to achieve precise molding of the battery cold plate, ensure good contact and uniform distribution between the battery cold plate and the battery cell, and thus improve the heat dissipation performance of the battery pack. At the same time, the battery pack obtained by this method has a higher utilization rate of the internal space of the battery lower case, which is conducive to the miniaturized design of the battery pack. Therefore, by using the battery pack assembly method in this application, the problems of difficult assembly of battery pack cold plates and poor heat exchange effects in the prior art can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram showing the positional relationship between the cold plate mold assembly, the battery cell and the lower battery box after the cold plate mold assembly and the battery cell are placed in the lower battery box in a specific embodiment of the present application;

[0019] Figure 2 Shows Figure 1 A schematic diagram of the structure of the lower battery box;

[0020] Figure 3 Shows Figure 1 A schematic diagram of the structure of the cold plate mold assembly;

[0021] Figure 4 Shows Figure 3 Schematic diagram of the partial structure of the intercooler plate mold assembly;

[0022] Figure 5 The schematic diagram of the structure of the battery cold plate formed after the forming agent is cured in the present application is shown;

[0023] Figure 6 Shows Figure 5 Schematic diagram of the partial structure of the battery cold plate.

[0024] The above drawings include the following reference numerals:

[0025] 10. Cold plate mold assembly; 11. Liquid collecting pipe mold; 111. Feature groove; 112. Connecting protrusion; 12. Harmonica tube mold; 20. Battery cell; 30. Battery lower box; 31. Baffle; 311. Liquid inlet; 312. Liquid outlet; 40. Battery cold plate; 42. Liquid collecting pipe; 43. Harmonica tube. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0028] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0029] In order to solve the problems of difficult assembly of cold plates of battery packs and poor heat exchange effect in the prior art, the present application provides a battery pack assembly method and a battery pack.

[0030] Furthermore, the battery pack in the present application is manufactured by the following battery pack assembly method.

[0031] The battery pack assembly method in the present application includes: placing the cold plate mold assembly 10 and the battery cell 20 into a molding space surrounded by the inner wall and the baffle 31 in the battery lower box 30, and reserving filling gaps between the inner wall of the battery lower box 30 and the cold plate mold assembly 10, between the baffle 31 and the cold plate mold assembly 10, and between the cold plate mold assembly 10 and the battery cell 20; pouring a molding agent into the molding space and filling the filling gap with the molding agent; after the poured molding agent is solidified, taking out the cold plate mold assembly 10 to form a battery pack with a battery cold plate 40, wherein the solidified molding agent forms the shell of the battery cold plate 40, and the space after the cold plate mold assembly 10 is taken out forms the cooling flow channel of the battery cold plate 40.

[0032] like Figures 1 to 6 As shown, using the battery pack assembly method in the present application, the battery lower box 30 and the battery cell 20 can be selected according to preset requirements, and a corresponding cold plate mold assembly 10 can be made or selected according to the size of the battery lower box 30 and the specifications of the battery cell 20, and after the production or selection of the cold plate mold assembly 10 is completed, the cold plate mold assembly 10 and the battery cell 20 are respectively placed in the molding space surrounded by the inner wall of the battery lower box 30 and the baffle 31, and filling gaps are reserved between the inner wall of the battery lower box 30 and the cold plate mold assembly 10, between the baffle 31 and the cold plate mold assembly 10, and between the cold plate mold assembly 10 and the battery cell 20, so that the molding agent can be poured into the filling gap, and the molding agent wraps the cold plate mold assembly 10, so that after the molding agent is cooled, the cold plate mold assembly 10 is taken out, and the structure after the molding agent is solidified forms the required battery cold plate 40 The shell, the space after the cold plate mold assembly 10 is taken out forms the cooling channel of the battery cold plate 40.

[0033] It should be noted that one side of the baffle 31 and the lower battery box 30 form a molding space for placing the battery cells 20 and the battery cold plate 40, and the other side of the baffle 31 and the lower battery box 30 form an installation space for placing other structures and electrical components in the battery pack. The structure of the lower battery box 30, the position and shape of the baffle 31, etc. can be adjusted according to the design requirements of the battery pack, and the embodiments of the present application do not limit this.

[0034] After the cold plate mold assembly 10 and the battery cell 20 are respectively placed in the molding space, the width of the reserved filling gap between the inner wall of the molding space and the adjacent cold plate mold assembly 10 and the reserved filling gap between the cold plate mold assembly 10 and the adjacent battery cell 20 can be set according to the shell design requirements of the battery cold plate 40, and the structure and size of the cold plate mold assembly 10 can be set according to the flow channel design requirements of the battery cold plate 40.

[0035] Based on this, in the present application, by using the cold plate mold assembly 10 and the molding agent in the battery lower box 30 to form the battery cold plate 40 and the cooling channel inside the battery cold plate 40, the precise molding of the battery cold plate 40 can be achieved, ensuring good contact between the battery cold plate 40 and the battery cell 20, thereby improving the heat dissipation performance of the battery pack. At the same time, in the battery pack obtained by this method, the battery cold plate 40 and the battery cell 20 fit more closely, and the internal space utilization rate of the battery lower box 30 is higher, which is conducive to the miniaturized design of the battery pack. Therefore, by using the battery pack assembly method in this application, the problems of difficult assembly of battery pack cold plates and poor heat exchange effects in the prior art can be effectively solved.

[0036] In a possible implementation, Figure 3 As shown, the cold plate mold assembly 10 includes two liquid collecting tube molds 11 and a plurality of harmonica tube molds 12, the extension direction of the liquid collecting tube mold 11 and the extension direction of the harmonica tube mold 12 are perpendicular to each other, the plurality of harmonica tube molds 12 are arranged between the two liquid collecting tube molds 11 at intervals, and the two ends of the plurality of harmonica tube molds 12 are respectively connected to the two liquid collecting tube molds 11; when the cold plate mold assembly 10 and the battery cell 20 are respectively placed in the molding space, the battery cell 20 is arranged in the accommodating space formed between the liquid collecting tube mold 11 and the harmonica tube mold 12, and a filling gap is arranged between the harmonica tube mold 12 and the adjacent battery cell 20, and between the liquid collecting tube mold 11 and the adjacent battery cell 20.

[0037] After the cold plate mold assembly 10 is taken out, the liquid collecting pipe mold 11 is used to form the liquid collecting pipe flow channel of the battery cold plate 40, and the harmonica tube mold 12 is used to form the harmonica tube flow channel of the battery cold plate 40, and the multiple harmonica tube flow channels are connected in parallel. During the use of the battery cold plate 40 in the subsequent battery pack, the coolant flows from one of the liquid collecting pipe flow channels into the multiple harmonica tube flow channels respectively, and the coolant in the multiple harmonica tube flow channels is collected in another liquid collecting pipe flow channel and flows out to achieve cooling of the battery cell 20. In addition, the embodiment of the present application does not limit the arrangement of the battery cell 20. Preferably, when the cold plate mold assembly 10 and the battery cell 20 are placed in the molding space, the two large faces of the battery cell 20 are respectively arranged adjacent to the harmonica tube mold 12 of the cold plate mold assembly 10. After the cold plate mold assembly 10 is taken out, the harmonica tube flow channel of the battery cold plate 40 is arranged close to the large face of the battery cell 20 to increase the heat dissipation area of ​​the battery cell 20.

[0038] It should be noted that the embodiment of the present application does not limit the production process of the cold plate mold assembly 10. The cold plate mold assembly 10 can be formed in one piece or assembled in parts, and the embodiment of the present application does not limit this.

[0039] Taking the above-mentioned cold plate mold assembly 10 including two liquid collecting tube molds 11 and multiple harmonica tube molds 12 and assembled separately as an example, the steps of making the cold plate mold assembly 10 include: arranging the two liquid collecting tube molds 11 opposite to each other and at intervals; arranging the multiple harmonica tube molds 12 between the two liquid collecting tube molds 11 at a preset distance and fixedly connecting them.

[0040] Optionally, the baffle 31 has a liquid inlet hole 311 and a liquid outlet hole 312. When the cold plate mold assembly 10 and the battery cell 20 are respectively placed in the molding space, one end of the liquid collecting tube mold 11 close to the baffle 31 abuts against the baffle 31, and the abutting surface of one of the liquid collecting tube molds 11 covers the liquid inlet hole 311, and the abutting surface of the other liquid collecting tube mold 11 covers the liquid outlet hole 312. At this time, since one end of the two collecting tube molds 11 close to the baffle 31 is in contact with the baffle 31, and the two collecting tube molds 11 cover the liquid inlet hole 311 and the liquid outlet hole 312 respectively, the end surface of the collecting tube mold 11 covering the liquid inlet hole 311 or the liquid outlet hole 312 will not be covered by the molding agent. After the cold plate mold assembly 10 is taken out, the liquid inlet hole 311 and the liquid outlet hole 312 of the baffle 31 can be directly connected to the cooling channel formed corresponding to this part of the collecting tube mold 11, so that the cooling medium can be introduced into the cooling channel through the liquid inlet hole 311, and the cooling medium in the cooling channel can be discharged through the liquid outlet hole 312.

[0041] In a specific embodiment of the present application, a connecting protrusion 112 is provided at the end of the liquid collecting tube mold 11 close to the baffle 31. In the process of placing the cold plate mold assembly 10 into the molding space, the connecting protrusions 112 at the ends of the two liquid collecting tube molds 11 of the cold plate mold assembly 10 are respectively arranged corresponding to the liquid inlet hole 311 and the liquid outlet hole 312 of the baffle 31. After the cold plate mold assembly 10 is taken out, the connecting protrusions 112 of the two liquid collecting tube molds 11 respectively form the liquid inlet and the liquid outlet of the battery cold plate 40. The setting of the connecting protrusion 112 can ensure that after the molding agent is cooled to form the battery cold plate 40, and after the connecting protrusion 112 is removed, the corresponding part of the connecting protrusion can form a flow channel for connecting the collecting pipe flow channel with the liquid inlet hole 311 or the liquid outlet hole 312, or one of the connecting protrusions 112 can form a fluid inlet for connecting one of the collecting pipe flow channels with the liquid inlet hole 311, and the other connecting protrusion 112 can form a fluid outlet for connecting another collecting pipe flow channel with the liquid outlet hole 312, thereby ensuring that in the subsequent use process, the cooling medium can be introduced into the battery cold plate 40 through the liquid inlet hole 311, and the cooling medium in the battery cold plate 40 can flow out through the liquid outlet hole 312, thereby realizing the entire cooling cycle to ensure the heat exchange effect and performance of the battery.

[0042] Moreover, in this embodiment, the connecting protrusion 112 can be cylindrical, and one of the axial end faces of the cylinder is set on the liquid collecting tube mold 11, and the other axial end face of the cylinder abuts against the peripheral edge of the liquid inlet hole 311 or the liquid outlet hole 312, thereby realizing the corresponding setting of the connecting protrusion 112 and the liquid inlet hole 311 or the liquid outlet hole 312.

[0043] Optionally, the diameter of the liquid inlet hole 311 is the same as or slightly smaller than the diameter of the connecting protrusion 112 , and the diameter of the liquid outlet hole 312 is the same as or slightly smaller than the diameter of the connecting protrusion 112 .

[0044] Optionally, each harmonica tube mold 12 includes at least one spacer bar spaced along the height direction of the battery, and the two ends of each spacer bar are respectively connected to different liquid collecting tube molds 11 to form at least one cooling channel. Moreover, each spacer bar will be wrapped by the molding agent. In the present application, multiple harmonica tube molds 12 can be spaced along the length direction of the liquid collecting tube mold 11, and the number of spacers of each harmonica tube mold 12 determines the number of channels that can be formed after the harmonica tube mold 12 is taken out.

[0045] Optionally, a plurality of characteristic grooves 111 spaced apart along the length direction are provided on the liquid collecting tube mold 11; the characteristic grooves 111 are connected to the harmonica tube mold 12 one by one, the end of the harmonica tube mold 12 is connected to the bottom surface of the characteristic grooves 111, and a filling gap is reserved between the side walls of the harmonica tube mold 12 and the characteristic grooves 111. Since the position corresponding to the characteristic grooves 111 is the portion where the liquid collecting tube 42 and the harmonica tube 43 are connected, by such a setting, the molding agent can be poured into the characteristic grooves 111 during the process of pouring the molding agent, so that after the battery cold plate 40 is formed, the connection strength between the liquid collecting tube 42 and the harmonica tube 43 can be strengthened to ensure the performance of the battery cold plate 40.

[0046] In a specific embodiment of the present application, the step of pouring the molding agent into the molding space and filling the gap with the molding agent includes: before pouring the molding agent into the molding space, installing the plug at the outlet hole 312 to seal the outlet hole 312; installing the plug at the inlet hole 311 to seal the inlet hole 311. By setting in this way, it can be ensured that the injected molding agent will not flow into the outlet hole 312 and the inlet hole 311, resulting in the outlet hole 312 and the inlet hole 311 being blocked, thereby ensuring that the battery cold plate 40 can be used normally. In the process of pouring the molding agent into the molding space, the molding agent is stopped after the height of the molding agent in the molding space exceeds the preset height of the cold plate mold assembly 10. In addition, in the present application, the height of the baffle 31 is higher than the height of the cold plate mold assembly 10. At the same time, in the process of pouring the molding agent into the molding space, it can be poured from the top of the molding space. After the molding agent is solidified, the plug in the inlet hole 311 and the plug in the outlet hole 312 are removed.

[0047] Optionally, a thermally conductive adhesive or a thermally conductive structural adhesive is used as the molding agent during the process of pouring the molding agent into the interior of the battery lower box 30. By using the thermally conductive adhesive and the thermally conductive structural adhesive as the molding agent, it can be ensured that the heat exchange effect between the battery cold plate 40 and the battery cell 20 generated by the cooling or solidification of the molding agent is better, thereby ensuring the performance of the battery cold plate 40.

[0048] Optionally, the material of the cold plate mold assembly 10 is a phase-changeable material or a thermally decomposable resin, and the phase change temperature of the phase-changeable material is lower than the softening temperature of the cured molding agent, and the thermal decomposition temperature of the thermally decomposable resin is lower than the softening temperature of the cured molding agent; the process of removing the cold plate mold assembly 10 from the battery cold plate 40 includes: heating the cold plate mold assembly 10 in the battery cold plate 40 to melt or thermally decompose it, and flow out of the battery cold plate 40.

[0049] In a specific embodiment of the present application, the cold plate mold assembly 10 is made of wax. Preferably, the cold plate mold is made of a low melting point solid material such as paraffin wax. When a wax mold is used as the cold plate mold assembly 10, a hot fluid may be introduced into the battery cold plate 40 or the battery cold plate 40 may be heated to allow the melted wax to flow out of the battery cold plate 40.

[0050] Optionally, during the process of removing the cold plate mold assembly 10 from the battery cold plate 40 : after the cold plate mold assembly 10 is melted, a cleaning medium is introduced into the battery cold plate 40 to discharge the melted material or thermal decomposition material of the cold plate mold assembly 10 from the battery cold plate 40 .

[0051] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0052] 1. Effectively solve the problems of difficult assembly of battery pack cold plates and poor heat exchange effect in the prior art;

[0053] 2. Compared with the prior art in which the battery cells are connected via a cold plate and thermally conductive adhesive, and the battery cells are cooled by circulating coolant in the cold plate, the present application directly uses a thermally conductive adhesive cold plate to connect the battery cells, and the battery cells are cooled by circulating coolant in the thermally conductive adhesive cold plate, thereby effectively improving the volume utilization rate of the battery cold plate, reducing the weight of the battery pack, and increasing the energy density of the battery pack.

[0054] 3. The battery pack manufactured by this method can quickly dissipate heat during operation, effectively reduce the battery temperature, extend the battery pack life, and improve the battery pack performance.

[0055] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack assembly method, characterized in that: include: The cold plate mold assembly (10) and the battery cell (20) are respectively placed in a molding space surrounded by the inner side wall and the baffle (31) in the battery lower box (30), and a filling gap is reserved between the inner side wall of the battery lower box (30) and the cold plate mold assembly (10), between the baffle (31) and the cold plate mold assembly (10), and between the cold plate mold assembly (10) and the battery cell (20); Pouring a molding agent into the molding space, and allowing the molding agent to fill the filling gap; After the injected molding agent is solidified, the cold plate mold assembly (10) is removed to form a battery pack having a battery cold plate (40), wherein the solidified molding agent forms a shell of the battery cold plate (40), and the space after the cold plate mold assembly (10) is removed forms a cooling channel of the battery cold plate (40).

2. The battery pack assembly method according to claim 1, characterized in that: The cold plate mold assembly (10) comprises two liquid collecting tube molds (11) and a plurality of harmonica tube molds (12); the extension direction of the liquid collecting tube mold (11) and the extension direction of the harmonica tube mold (12) are perpendicular to each other; the plurality of harmonica tube molds (12) are arranged between the two liquid collecting tube molds (11) at intervals, and the two ends of the plurality of harmonica tube molds (12) are respectively connected to the two liquid collecting tube molds (11); When the cold plate mold assembly (10) and the battery cell (20) are respectively placed in the molding space, the battery cell (20) is arranged in the accommodating space formed between the collecting pipe mold (11) and the harmonica tube mold (12), and the filling gap is provided between the harmonica tube mold (12) and the adjacent battery cell (20), and between the collecting pipe mold (11) and the adjacent battery cell (20).

3. The battery pack assembly method according to claim 2, characterized in that: The baffle (31) has a liquid inlet hole (311) and a liquid outlet hole (312); when the cold plate mold assembly (10) and the battery cell (20) are respectively placed in the molding space, one end of the liquid collecting tube mold (11) close to the baffle (31) abuts against the baffle (31), and a contact surface of one of the liquid collecting tube molds (11) covers the liquid inlet hole (311), and a contact surface of the other liquid collecting tube mold (11) covers the liquid outlet hole (312).

4. The battery pack assembly method according to claim 3, characterized in that: The end of the collecting pipe mold (11) close to the baffle (31) is provided with a connecting protrusion (112); when the cold plate mold assembly (10) is placed in the molding space, the connecting protrusions (112) at the ends of the two collecting pipe molds (11) of the cold plate mold assembly (10) are respectively arranged to correspond to the liquid inlet hole (311) and the liquid outlet hole (312) of the baffle (31). After the cold plate mold assembly (10) is taken out, the connecting protrusions (112) of the two liquid collecting pipe molds (11) respectively form the liquid inlet and the liquid outlet of the battery cold plate (40).

5. The battery pack assembly method according to claim 2, characterized in that: Each of the harmonica tube molds (12) comprises at least one spacer bar spaced apart along the height direction of the battery, and both ends of each of the spacers are respectively connected to different liquid collecting pipe molds (11) to form at least one cooling channel.

6. The battery pack assembly method according to claim 2, characterized in that: The collecting pipe mold (11) is provided with a plurality of characteristic grooves (111) spaced apart along the length direction; the characteristic grooves (111) are connected to the harmonica tube mold (12) in a one-to-one correspondence, the end of the harmonica tube mold (12) is connected to the bottom surface of the characteristic groove (111), and a filling gap is reserved between the side wall of the harmonica tube mold (12) and the characteristic groove (111).

7. The battery pack assembly method according to any one of claims 1 to 6, characterized in that: The step of pouring the molding agent into the molding space and filling the filling gap with the molding agent comprises: Before pouring the molding agent into the molding space, a plug is installed at the liquid outlet hole (312) of the baffle (31) to seal the liquid outlet hole (312); the plug is installed at the liquid inlet hole (311) of the baffle (31) to seal the liquid inlet hole (311); During the process of pouring the molding agent into the molding space, after the height of the molding agent in the molding space exceeds the height of the cold plate mold assembly (10), the pouring of the molding agent is stopped; After the molding agent is solidified, the plug in the liquid inlet (311) and the plug in the liquid outlet (312) are removed.

8. The battery pack assembly method according to any one of claims 1 to 6, characterized in that: The material of the cold plate mold assembly (10) is a phase-changeable material or a thermally decomposable resin, and the phase change temperature of the phase-changeable material is lower than the softening temperature of the cured molding agent, and the thermal decomposition temperature of the thermally decomposable resin is lower than the softening temperature of the cured molding agent; The process of removing the cold plate mold assembly (10) from the battery cold plate (40) comprises: The cold plate mold assembly (10) in the battery cold plate (40) is melted or thermally decomposed by heating and flows out of the battery cold plate (40).

9. The battery pack assembly method according to claim 8, characterized in that: During the process of taking out the cold plate mold assembly (10) from the battery cold plate (40): After the cold plate mold assembly (10) is melted, a cleaning medium is introduced into the battery cold plate (40) to discharge the melted product or thermal decomposition product of the cold plate mold assembly (10) from the battery cold plate (40).

10. A battery pack, characterized in that: The battery pack is manufactured by the battery pack assembly method according to any one of claims 1 to 9.

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