Battery module, battery, and method for assembling battery module

Abstract

The battery module (1) and battery include: a case (2) defining an installation space; at least one electrode assembly (3) installed in the installation space; and an adhesive storage structure (4) connected to the electrode assembly (3) and positioned in the installation space, defining an adhesive storage tank (41) with one open end, the open end of the adhesive storage tank (41) being spaced apart from the top wall or bottom wall of the case (2).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No. "202011356339.7" entitled "Battery Module and Battery" filed on November 26, 2020 by BYD Company Limited. [Technical field]

[0002] The present application relates to the technical field of batteries, and in particular to a battery module, a battery, and a method for assembling a battery module. [Background technology]

[0003] In the related art, in the process of assembling a conventional battery module, the method of fixing an electrode assembly in a case is generally by adhesive fixation, which is to inject adhesive into the bottom of the case and fix and connect the electrode assembly in the case with adhesive. The case of a conventional battery module is long, and after the electrode assembly is assembled into the case, the gap between any two adjacent electrode assembly groups or between the electrode assembly group and the case is small, making it difficult to inject adhesive, and even if it is injected, the adhesive is filled unevenly in the bottom of the aluminum case, which causes the electrode assembly to wobble in the case during the use of the battery module, resulting in poor contact between the electrodes of the battery module and the electrode assembly group. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems in the prior art. To this end, one objective of the present application is to provide a battery module that can improve the operational stability of the battery module by installing an adhesive storage structure in the battery module.

[0005] The present application further provides a battery.

[0006] The present application further provides a method for assembling a battery module.

[0007] The battery module of the present application includes a case defining an installation space, at least one electrode body group installed in the installation space, and an adhesive storage structure connected to the electrode body group and positioned in the installation space, defining an adhesive storage tank with one end open, the open end of the adhesive storage tank being spaced apart from a top wall or a bottom wall of the case.

[0008] According to the battery module of the present application, by providing an adhesive storage structure in the battery module, when adhesive is injected into the case through the adhesive storage structure during the assembly process of the battery module, the adhesive in the adhesive storage structure can be evenly filled at the bottom of the mounting space and the electrode group can be firmly adhered and fixed inside the case, thereby improving the operational stability of the battery module, and the adhesive storage structure can keep positions in the case that do not require adhesive clean, thereby improving the heat dissipation capability of the battery module and further extending the service life of the batteries.

[0009] In some examples of the present application, there are multiple electrode body groups, the multiple electrode body groups are arranged in sequence in the longitudinal direction of the electrode body groups, and the adhesive storage structure is installed between at least two adjacent electrode body groups among the multiple electrode body groups and / or between the electrode body groups and the case.

[0010] In some examples herein, the adhesive reservoir structure extends in a height direction of the electrode assembly.

[0011] In some examples of the present application, an adhesive flow channel is provided on the outer surface of the adhesive storage structure to store adhesive and thereby connect the adhesive storage structure to the electrode assembly.

[0012] In some examples of the present application, the adhesive storage structure has a first surface and a second surface positioned opposite each other in the width direction of the battery module, and the adhesive flow path is located on the first surface and / or the second surface.

[0013] In some examples of the present application, the length of the mounting space in the length direction of the battery module is L, the width of the mounting space in the width direction of the battery module is A, the gap distance between the electrode group and the case in the height direction of the battery module is B, and the total adhesive storage amount of the adhesive storage structure is Q, satisfying the relationship Q=L×A×B.

[0014] In some examples of the present application, the adhesive storage structures are in quantity N, each having an adhesive storage capacity Q1, which satisfies the relationship Q1=(L×A×B) / N.

[0015] In some examples of the present application, B satisfies the relationship 0.5 mm≦B≦5 mm.

[0016] In some examples of the present application, B satisfies the relationship 1 mm≦B≦3 mm.

[0017] In some examples of the present application, the electrode assembly group includes at least one electrode assembly, and the width direction of the battery module is the same as the thickness direction of the electrode assembly.

[0018] In some examples of the present application, at least one of the electrode bodies is arranged in sequence in the width direction of the battery module to form the electrode body group, and opposing side walls of any two adjacent electrode bodies installed in the thickness direction of the electrode body abut each other.

[0019] In some examples of the present application, the electrode bodies are provided in the same number and with the same thickness in each electrode body group.

[0020] In some examples herein, the adhesive reservoir structure is prismatic or cylindrical.

[0021] In some examples of the present application, the adhesive storage structure is multiple, and the multiple adhesive storage structures are spaced apart in sequence in the longitudinal direction of the electrode body group, with the adhesive storage structure being installed between any two adjacent electrode body groups and / or between the electrode body group and the case.

[0022] A battery according to the present application includes the battery module.

[0023] A method for assembling a battery module according to the present application, the battery module including a case defining an installation space, an adhesive storage structure defining an adhesive storage tank with one end open, and at least one electrode body group, the assembly method including the steps of connecting the adhesive storage structure to the electrode body group and placing the open end of the adhesive storage tank facing upward, injecting adhesive into the adhesive storage tank of the adhesive storage structure, placing the entire adhesive storage structure and the electrode body group into the installation space, separating the open end of the adhesive storage tank from a top wall or bottom wall of the case, sealing the case, and clamping the case to rotate the battery module 180 degrees.

[0024] According to the battery module assembly method of the present application, when the battery module is assembled using the assembly method and adhesive is injected into the case using the adhesive storage structure, the adhesive in the adhesive storage structure can be evenly filled at the bottom of the mounting space and the electrode body group can be firmly adhered and fixed inside the case, thereby improving the operational stability of the battery module; and since the assembly method can be used to keep positions in the case that do not require adhesive clean, the heat dissipation capability of the battery module can be improved and the service life of the battery can be extended.

[0025] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0026] [Figure 1]FIG. 1 is a schematic diagram of a battery module according to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of an electrode assembly of a battery module according to an embodiment of the present application connected to an adhesive storage structure. FIG. [Diagram 3] 13 is a schematic diagram of an electrode assembly of a battery module according to an embodiment of the present application, viewed from another angle when being connected to an adhesive storage structure. FIG. [Figure 4] 2 is a schematic diagram of an adhesive storage structure of a battery module according to an embodiment of the present application; [Diagram 5] FIG. 2 is a front view of a plurality of electrode body groups according to an embodiment of the present application after they are connected in series. [Figure 6] FIG. 2 is a plan view of a plurality of electrode body groups according to an embodiment of the present application after they are connected in series. [Figure 7] 2 is a flowchart of an assembly method according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are only for interpreting the present application, and should not be understood as limiting the present application.

[0028] A battery module 1 according to an embodiment of the present invention will be described below with reference to Figures 1 to 6. Here, the battery module 1 is installed in a battery.

[0029] As shown in Figures 1 to 6, a battery module 1 according to an embodiment of the present application includes a case 2 defining an installation space, an adhesive storage structure 4, and at least one electrode body group 3 installed in the installation space, and the adhesive storage structure 4 is connected to the electrode body group 3 and is located in the installation space, defining an adhesive storage tank 41 having one open end, and the open end of the adhesive storage tank 41 is installed at a distance from the top wall or bottom wall of the case 2.

[0030] In the process of assembling the battery module 1, first, the adhesive storage structure 4 is connected to the electrode body group 3, and the open end of the adhesive storage structure 4 is placed facing upward in FIG. 2; then, adhesive is injected into the adhesive storage structure 4; the adhesive storage structure 4 and the entire electrode body group 3 are placed in the mounting space; the case 2 is sealed; and then the battery module 1 is clamped and rotated 180° along the length direction of the case 2; at this time, the open end of the adhesive storage structure 4 faces downward in FIG. 1 within the mounting space, and the open end of the adhesive storage tank 41 is installed with a gap between it and the top or bottom wall of the case 2. Therefore, the adhesive in the adhesive storage structure 4 flows out of the adhesive storage tank 41 due to the action of gravity, and is applied between the electrode body group 3 and the top wall of the case 2 or between the electrode The adhesive liquid level is flat and uniform, and the contact area between the electrode group 3 and the adhesive is large, so that the electrode group 3 can be firmly attached to the case 2 and the electrode group 3 does not wobble in the case 2, thereby improving the operational stability of the battery module 1. In addition, in the process of turning over the battery module 1, the adhesive does not fall between the electrode group 3 and the side wall of the case 2, and when the electrode group 3 expands during the use of the battery module 1, the adhesive does not affect the heat transfer between the electrode group 3 and the case 2, so that the heat dissipation performance of the battery module 1 can be guaranteed, and the service life of the battery module 1 can be extended. Furthermore, when the open end of the adhesive storage tank 41 is placed at a distance from the top wall of the case 2, the adhesive in the adhesive storage structure 4 flows out from the adhesive storage tank 41 and is uniformly filled in the gap between the electrode group 3 and the top wall of the case 2, and when the open end of the adhesive storage tank 41 is placed at a distance from the bottom wall of the case 2, the adhesive in the adhesive storage structure 4 flows out from the adhesive storage tank 41 and is uniformly filled in the gap between the electrode group 3 and the bottom wall of the case 2.

[0031] Therefore, by installing the adhesive storage structure 4 in the battery module 1, when adhesive is injected into the case through the adhesive storage structure during the assembly process of the battery module 1, the adhesive in the adhesive storage structure 4 can be evenly filled at the positions between the electrode body group 3 and the case 2 where adhesive needs to be installed, and the electrode body group 3 can be firmly adhered and fixed in the case 2, thereby improving the operational stability of the battery module 1. In addition, the adhesive storage structure 4 can keep the positions in the case 2 where adhesive is not required clean, thereby improving the heat dissipation capability of the battery module 1 and further extending the service life of the battery.

[0032] In some embodiments of the present application, as shown in Figures 2 and 3, the electrode body group 3 may be a plurality of electrode body groups 3, and the plurality of electrode body groups 3 may be arranged in order in the longitudinal direction of the electrode body group 3, and an adhesive storage structure 4 may be installed between at least two adjacent electrode body groups 3 among the plurality of electrode body groups 3 and / or between the electrode body group 3 and the case 2. Since the adhesive storage structure 4 may be installed in at least two adjacent electrode body groups 3 among the plurality of electrode body groups 3, when the adhesive is injected into the case 2 by the adhesive storage structure 4, the adhesive injected from the adhesive storage structure 4 into the case 2 can spread toward the radial direction of the case 2, and the adhesive is distributed between any two adjacent adhesive storage structures 4 in the longitudinal direction of the case 2, so that it is possible to ensure that the adhesive is uniformly filled at the position where the adhesive needs to be installed between the electrode body group 3 and the case 2, and the number of adhesive storage structures 4 is appropriately reduced by installing in this way, and the manufacturing cost of the battery module 1 can also be reduced and the energy density of the battery module 1 can be increased. In addition, installing the adhesive storage structure 4 between the electrode body group 3 and the case 2 means that the adhesive storage structure 4 can be installed between the electrode body group 3 and the inner surfaces of two side walls that are installed at intervals in the longitudinal direction of the battery module 1 of the case 2, the longitudinal direction of the battery module 1 referring to the front-to-rear direction in Figure 1, and the inner surface of the case 2 referring to the surface facing the mounting space of the case 2, and installing it in this manner can ensure close contact between the electrode body group 3 and the case 2.

[0033] Furthermore, a plurality of adhesive storage structures 4 may be provided, and the plurality of adhesive storage structures 4 may be provided at intervals in the longitudinal direction of the electrode body group 3, and the adhesive storage structure 4 may be provided between any two adjacent electrode body groups 3 and / or between the electrode body group 3 and the case 2, and preferably, the adhesive storage structure 4 may be provided both between any two adjacent electrode body groups 3 and between the electrode body group 3 and the case 2. Since the adhesive storage structure 4 is provided between any two adjacent electrode body groups 3 and between the electrode body group 3 and the case 2, the adhesive storage structure 4 in the case 2 can be made denser and the uniformity of the adhesive in the case 2 can be further improved, so that the electrode body group 3 and the case 2 can be more reliably bonded to each other.

[0034] In some embodiments of the present application, as shown in FIG. 2, the adhesive storage structure 4 extends in the height direction of the electrode body group 3. The adhesive storage structure 4 may be installed in a prismatic shape, but the present application is not limited thereto. The adhesive storage structure 4 may be installed in other shapes, for example, in a cylindrical shape. An adhesive storage tank 41 may be installed in the adhesive storage structure 4, one end of the adhesive storage tank 41 is open, and the side wall and bottom wall of the adhesive storage tank 41 are sealed. The height direction of the electrode body group 3 refers to the up-down direction shown in FIG. 2. By installing in this manner, the adhesive storage structure 4 can reduce the amount of space occupied by the adhesive storage structure 4 between any two adjacent electrode body groups 3 or between the electrode body group 3 and the case 2, thereby increasing the volume of the electrode body group 3 and further increasing the storage capacity of the battery module 1. The adhesive storage structure 4 extends in the height direction of the electrode body group 3 to increase the volume of the adhesive storage tank 41, thereby increasing the amount of adhesive stored in the adhesive storage tank 41.

[0035] In addition, in the related art, the adhesive is injected into the opening at the end of the case. When the length size of the case is long, the adhesive injection pressure required to inject the adhesive into the case increases with the increase in the amount of adhesive injected into the case, so that the adhesive flows from the gap between the case and the electrode body group and between the electrode body groups to positions of the electrode body group that do not require adhesive, causing the electrode body group 3 to extend in the height direction by the adhesive storage structure 4. In the process of turning over the battery module 1 after the adhesive storage structure 4 and the electrode body group 3 are put into the case 2, the adhesive in the adhesive storage tank 41 is not likely to spill out. By installing in this way, the positions in the case 2 that do not require adhesive can be kept clean, so that the heat dissipation ability of the battery module 1 can be improved and the service life of the battery can be extended.

[0036] In some embodiments of the present application, as shown in Figures 3 and 4, an adhesive flow path 42 is provided on the outer surface of the adhesive storage structure 4 to store adhesive and connect the adhesive storage structure 4 to the electrode body group 3. In the process of connecting the adhesive storage structure 4 to the electrode body group 3, the electrode body group 3 is placed together with the adhesive storage structure 4 in a low-pressure injection molding die, and hot melt adhesive is injected into the adhesive flow path 42 by low-pressure injection molding, so that the hot melt adhesive can fill the adhesive flow path 42, and the adhesive storage structure 4 and the electrode body group 3 are bonded from one end of the adhesive flow path 42 that is open to the side wall of the adhesive storage structure 4, and by being installed in this way, the adhesive storage structure 4 can be firmly connected to the electrode body group 3.

[0037] In some embodiments of the present application, as shown in Figures 2 and 3, the adhesive storage structure 4 has a first surface and a second surface located opposite to each other in the width direction of the battery module 1, and an adhesive flow path 42 may be provided on the first surface and / or the second surface. Note that the width direction of the battery module 1 refers to the left-right direction in Figure 1, and the adhesive flow path 42 may be provided on the first surface and the second surface of the adhesive storage structure 4, respectively. By providing such an adhesive flow path 42, the connection between the adhesive storage structure 4 and the electrode body group 3 can be made stronger, and the adhesive storage structure 4 can not only inject the adhesive into the mounting space, but also support the electrode body group 3 in the length direction of the battery module 1. Specifically, in the length direction of the battery module 1, a tab is connected between two adjacent electrode body groups 3, and in the width direction of the battery module 1, two adjacent tabs are provided at an interval to form a gap, and the adhesive storage structure 4 may be provided in the gap or may fill the gap. 1, the length direction of the battery module 1 refers to the front-rear direction in Fig. 1, and the tabs of the electrode body group 3 are made of a soft material and are connected to the electrode body group 3 by the adhesive storage structure 4, which can support the tabs, improving the operational stability of the battery module 1. An adhesive flow path 42 may be provided on the first or second surface of the adhesive storage structure 4, and such an arrangement can reduce the number of processing steps for the adhesive storage structure 4.

[0038] 2 , in some embodiments of the present application, the length of the mounting space in the length direction of the battery module 1 is L, the width of the mounting space in the width direction of the battery module 1 is A, the gap between the electrode assembly group 3 and the case 2 in the height direction of the battery module 1 is B, and the total adhesive storage amount of the adhesive storage structure 4 is Q, which satisfies the relation Q=L×A×B. During the assembly process of the battery module 1, the electrode assembly group 3 and the adhesive storage structure 4 are connected and then inserted into the case 2, and the gap between the electrode assembly group 3 and the case 2 at this time refers to the distance from the upper end surface of the electrode assembly group 3 to the upper surface inside the case 2. In addition, when the electrode assembly group 3 and the adhesive storage structure 4 are connected and then inserted into the case 2, the electrode assembly group 3 abuts against the lower surface inside the case 2, and after the adhesive storage structure 4 and the electrode assembly group 3 are inserted into the case 2, the electrode assembly group 3 is held against the two side walls in the width direction of the battery module 1, so that the electrode assembly group 3 is prevented from being displaced inside the case 2, and since there is a gap between the electrode assembly group 3 and the case 2 in the height direction of the battery module 1, the adhesive storage structure 4 can ensure that the adhesive flows out under the action of gravity. Therefore, the adhesive stored in all of the adhesive storage structures 4 in the case 2 should be completely filled into the gap between the electrode assembly group 3 and the case 2 in the height direction of the battery module 1, so that the upper end surface of the electrode assembly group 3 is connected to the upper surface inside the case 2 by the adhesive, thereby fixing the relative position between the electrode assembly group 3 and the case 2 in the installation space, and further improving the operational stability of the battery module 1. In addition, by using Q=L×A×B, the installation volume of the adhesive can be made appropriate, and it can be ensured that the adhesive is evenly filled in the positions where the adhesive needs to be installed between the electrode group 3 and the case 2, thereby preventing the electrode group 3 from wobbling.

[0039] In some embodiments of the present application, as shown in Figures 2 and 3, the adhesive storage structures 4 are uniformly arranged in the case 2, the number of them is N, and the adhesive storage amount of each is Q1, satisfying the relational formula Q1 = (L x A x B) / N. As can be seen, the adhesive storage amount of the adhesive storage tank 41 in each adhesive storage structure 4 is the same, and the adhesive in the adhesive storage tank 41 can be uniformly spread in the gap between the electrode assembly group 3 and the case 2 in the height direction of the battery module 1 by the action of gravity, and by installing in this way, the liquid surface of the adhesive flowing into the mounting space can be made flat, so that the contact area between the adhesive and the upper end surface of the electrode assembly group 3 can be increased, and the electrode assembly group 3 can be firmly adhered and fixed in the case 2 by the adhesive.

[0040] In some embodiments of the present application, B satisfies the relational expression of 0.5 mm≦B≦5 mm. Preferably, the gap distance B between the electrode body group 3 and the case 2 in the height direction of the battery module 1 can be set to 1 mm to 3 mm. By setting it in this manner, the amount of adhesive stored in the adhesive storage structure 4 can be reduced, the size of the case 2 can be reduced, the energy density of the battery module 1 can be increased, and the manufacturing cost of the battery module 1 can be reduced.

[0041] In some embodiments of the present application, as shown in Figures 2 and 3, the electrode body group 3 includes at least one electrode body 31, the width direction of the battery module 1 is the same as the thickness direction of the electrode body 31, the width direction of the battery module 1 and the thickness direction of the electrode body 31 indicate the left-right direction in Figures 1 and 2, the at least one electrode body 31 is sequentially arranged in the width direction of the battery module 1 to form the electrode body group 3, and the opposing side walls of any two adjacent electrode bodies 31 installed in the thickness direction of the electrode body 31 abut against each other. By combining multiple electrode bodies 31 to form the electrode body group 3, the designer can adjust the width size of the battery module 1 by changing the number of electrode bodies 31 in each electrode body group 3, which is advantageous for general-purpose design of the battery module 1 and can reduce the design cost of the battery module 1.

[0042] Furthermore, the multiple electrode body groups 3 may be arranged in sequence in the longitudinal direction of the battery module 1, and the same number and thickness of electrode bodies 31 may be installed in each electrode body group 3. After the multiple electrode body groups 3 are connected in series, the width of the multiple electrode body groups 3 connected in series can be made uniform by installing them in this manner. In the longitudinal direction of the battery module 1, as shown in Figures 5 and 6, a series weld 32 is formed between any two adjacent electrode bodies 31, and in the width direction of the battery module 1, a mounting cavity 33 is defined together with the electrode bodies 31 between any two adjacent series welds 32. The adhesive storage structure 4 may be installed in the mounting cavity 33 and bonded to the series weld 32, thereby realizing that the adhesive storage structure 4 is fixedly connected to the electrode body group 3 by a hot melt adhesive.

[0043] As shown in Figs. 1 to 7, according to the battery module 1 in the above embodiment, the assembly flow of the battery module 1 will be described.

[0044] An assembly method according to an embodiment of the present application, in which a battery module includes a case defining an installation space, an adhesive storage structure defining an adhesive storage tank having an open end, and at least one electrode body group, and according to the assembly method of the battery module of the present application, it is possible to assemble the battery module in the above embodiment, and the assembly method includes the following steps S1 to S4.

[0045] In S1, the adhesive reservoir is connected to the electrode assembly, and the open end of the adhesive reservoir is placed upward. Specifically, an assembler or a robot arm can place the adhesive reservoir on the serial welds of any two adjacent electrode assembly groups, and then the electrode assembly groups together with the adhesive reservoir can be placed into a low-pressure injection mold, and the electrode assembly groups and the adhesive reservoir can be fixedly connected by hot melt adhesive through low-pressure injection molding, so that the adhesive reservoir can be fixed in the mounting cavity, and then the open end of the adhesive reservoir is held upward before the electrode assembly groups and the adhesive reservoir are fitted into the case.

[0046] In S2, adhesive is injected into an adhesive reservoir in the adhesive reservoir structure.

[0047] In S3, the adhesive reservoir structure and the entire electrode assembly are placed into the mounting space, the open end of the adhesive reservoir is spaced from the top or bottom wall of the case, and the case is sealed to form an enclosed space within the sealed case.

[0048] In S4, the case is clamped and the battery module is rotated 180°. The battery module is clamped by clamping two side walls of the case in the width direction of the battery module, and the battery module is rotated 180° along the length direction of the battery module, and the adhesive in the adhesive reservoir flows out of the adhesive reservoir due to the action of gravity and becomes flat on the bottom surface of the case, thereby realizing the adhesion and fixation of the electrode assembly and the case.

[0049] The battery according to the embodiment of the present application includes the battery module 1 according to the above embodiment, and an adhesive storage structure 4 is installed in the battery module 1. During the assembly process of the battery module 1, when adhesive is injected into the case 2 by the adhesive storage structure 4, the adhesive in the adhesive storage structure 4 can be evenly filled at the bottom of the mounting space, and the electrode group 3 can be firmly adhered and fixed in the case 2, thereby improving the operational stability of the battery module 1. The adhesive storage structure 4 can keep positions in the case 2 that do not require adhesive clean, thereby improving the heat dissipation capability of the battery module 1 and further extending the service life of the battery.

[0050] In the description of this application, the orientations or positional relationships indicated by the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of easily explaining and simplifying the description of this application, and do not indicate or suggest that the devices or parts shown must have a specific orientation and be configured and operated in a specific orientation, and should not be understood as limiting the application.

[0051] In this description, "plurality" means two or more.

[0052] In the description herein, the reference phrases such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "particular examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in the combination of the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, exemplary references to the above phrases are not necessarily limited to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples, as appropriate.

[0053] Although embodiments of the present application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and objectives of the present application, and that the scope of the present application is limited by the claims and their equivalents.

Claims

1. A case defining an installation space; At least one electrode body group installed in the mounting space; an adhesive storage structure connected to the electrode group and located within the mounting space, the adhesive storage structure including a first adhesive storage tank having an open end, the open end of the first adhesive storage tank being spaced apart from a top wall or a bottom wall of the case; a second adhesive storage tank is provided on an outer surface of the adhesive storage structure, and the second adhesive storage tank connects the adhesive storage structure to the electrode body group by storing adhesive.

2. The electrode body group is a plurality of electrode body groups, and the plurality of electrode body groups are arranged in order in a longitudinal direction of the electrode body group; The battery module according to claim 1 , wherein the adhesive storage structure is provided between at least two adjacent electrode body groups and / or between the electrode body group and the case.

3. 3. The battery module according to claim 1, wherein the adhesive reservoir structure extends in a height direction of at least one of the electrode body groups.

4. 4. The battery module according to claim 3, wherein the adhesive storage structure has a first surface and a second surface located opposite each other in a width direction of the battery module, and the second adhesive storage tank is installed on the first surface and / or the second surface.

5. A battery module, A case defining an installation space; At least one electrode body group installed in the mounting space; an adhesive storage structure connected to the electrode group and located within the mounting space, the adhesive storage structure including a first adhesive storage tank having an open end, the open end of the first adhesive storage tank being spaced apart from a top wall or a bottom wall of the case; When the length of the mounting space in the length direction of the battery module is L, the width of the mounting space in the width direction of the battery module is A, the gap distance between the electrode body group and the case in the height direction of the battery module is B, and the total adhesive storage amount of the adhesive storage structure is Q, the following relational expression is satisfied: Q = L x A x B A battery module comprising:

6. The adhesive storage structures are uniformly arranged in the case, and the number of the adhesive storage structures is N, and each adhesive storage volume is Q １ Then, the relation is: Q １ =(L×A×B) / N 6. The battery module according to claim 5, wherein the above-mentioned condition is satisfied.

7. 6. The battery module according to claim 5, wherein B satisfies a relational expression of 0.5 mm≦B≦5 mm.

8. 8. The battery module according to claim 7, wherein B satisfies the relation: 1 mm≦B≦3 mm.

9. 6. The battery module according to claim 5, wherein the electrode assembly group includes at least one electrode assembly, and the width direction of the battery module is the same as the thickness direction of the electrode assembly.

10. 10. The battery module according to claim 9, wherein at least one of the electrode bodies is arranged in sequence in the width direction of the battery module to form the electrode body group, and opposing side walls of any two adjacent electrode bodies installed in the thickness direction of the electrode bodies abut against each other.

11. The battery module according to claim 9 , wherein the electrode bodies are provided in the same number and with the same thickness in each electrode body group.

12. The battery module according to any one of claims 1 to 11, wherein the adhesive reservoir structure is prismatic or cylindrical.

13. 3. The battery module of claim 2, wherein the adhesive storage structure is multiple, the multiple adhesive storage structures are arranged at intervals in the longitudinal direction of the electrode body group, and the adhesive storage structure is arranged between any two adjacent electrode body groups and / or between the electrode body group and the case.

14. A battery comprising the battery module according to any one of claims 1 to 13.

15. A method for assembling a battery module, comprising the steps of: The battery module includes a case defining an installation space, an adhesive reservoir structure including an adhesive reservoir tank having an open end, and at least one electrode assembly group, and the assembly method includes: connecting the adhesive reservoir structure to the electrode assembly and placing an open end of the adhesive reservoir toward an upward direction; injecting adhesive into an adhesive reservoir of the adhesive reservoir structure; placing the adhesive reservoir structure and the entire electrode assembly into the mounting space, spacing an open end of the adhesive reservoir from a top wall of the case, and sealing the case; and rotating the battery module 180 degrees while clamping the case.

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