Battery pack

Abstract

The battery pack comprises a box body, a glue injection assembly and a plurality of battery cells, a containing cavity is formed in the box body, the plurality of battery cells are arranged in the containing cavity in rows at intervals to form a battery cell group, and a gap exists between every two adjacent rows of battery cells; the glue injection assembly is arranged at the gap, a glue injection runner is arranged in the glue injection assembly, the glue injection runner is communicated with the accommodating cavity and is used for injecting glue into the accommodating cavity, and the battery cell group and the glue injection assembly are both embedded in the glue. Furthermore, glue can be accurately injected into the gaps among the battery cells through the glue injection assembly, so that sufficient flowing and filling of the glue among the battery cells are ensured, the glue injection uniformity in the battery pack can be improved, the operation is convenient, and the glue injection efficiency is high. Besides, by adopting the glue injection assembly structure, after glue injection is completed, the glue injection assembly can be selected to be taken out or reserved in the battery pack, use is more flexible, and application requirements of different scenes can be met.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack. Background Art

[0002] With the continuous advancement of energy storage technology, battery packs are developing towards integration, lightness and integration. More and more battery packs are using the form of assembling the battery cells directly in the battery pack, rather than assembling them into modules first and then assembling them into battery packs. Since the module structure is eliminated, it is necessary to consider the fixation of the battery cells in the battery box.

[0003] In the related art, the battery cells are usually fixed by glue encapsulation. Specifically, after all the battery cells are placed in the battery box, glue is injected into the gaps between the battery cells and between the battery cells and the box by glue injection equipment to encapsulate and fix the battery cells. However, the glue injection method of the related art has low glue injection efficiency and uneven glue injection distribution. Summary of the invention

[0004] The present application aims to provide a battery pack that can solve the problem of low glue injection efficiency and uneven distribution of glue injection amount in the glue injection method using related technologies.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application proposes a battery pack, comprising a case body, a glue injection assembly and a plurality of battery cells, wherein a accommodating cavity is provided in the case body, and a plurality of battery cells are arranged in rows in the accommodating cavity to form a battery cell group, and there is a gap between two adjacent rows of battery cells; the glue injection assembly is arranged at the gap, and a glue injection channel is provided in the glue injection assembly, and the glue injection channel is connected to the accommodating cavity for injecting glue into the accommodating cavity, and the battery cell group and the glue injection assembly are both embedded in the glue.

[0007] In the second aspect, an embodiment of the present application proposes a battery pack, comprising a box body and a plurality of battery cells, wherein a accommodating cavity is provided in the box body, and the plurality of battery cells are arranged in rows in the accommodating cavity to form a battery cell group; the accommodating cavity is also filled with glue, and the battery cell group is embedded in the glue, and the glue is suitable for being formed by glue injection using a glue injection component, and the glue injection component is suitable for at least partially extending between two adjacent rows of battery cells so that the glue injection channel in the glue injection component is connected to the accommodating cavity to inject glue into the accommodating cavity.

[0008] Optionally, the first pipe and the second pipe are included, the accommodating cavity has a cavity opening and a cavity bottom facing each other, the first pipe extends from the cavity opening to the cavity bottom, and the extension direction of the second pipe intersects with the extension direction of the first pipe;

[0009] A first flow channel is provided in the first pipe, a second flow channel is provided in the second pipe, and the first flow channel is connected with the second flow channel to form the glue injection flow channel; a glue injection port connected with the first flow channel is provided at one end of the first pipe close to the cavity opening, and the second pipe is provided with a glue outlet connected with the second flow channel, and the glue outlet is connected with the accommodating cavity.

[0010] Optionally, a plurality of the glue outlets are provided in the second pipe, and the plurality of the glue outlets are arranged in sequence and at intervals along the extension direction of the second pipe.

[0011] Optionally, the glue outlet faces the cavity bottom.

[0012] Optionally, a plurality of the first pipes are provided in the glue injection assembly, and the plurality of the first pipes are arranged in sequence and at intervals along the extension direction of the second pipe, and at least one glue outlet is provided between two adjacent first pipes.

[0013] Optionally, at least one glue injection assembly is provided between every two rows of battery cells.

[0014] Optionally, the box body includes a side panel and a bottom panel, the side panel and the bottom panel enclose the accommodating cavity, the bottom panel is provided with a glue injection groove at a position corresponding to each of the battery cells, a glue injection cavity is provided in the bottom panel, the glue injection groove is connected to the glue injection cavity, and the glue injection cavity is connected to the glue injection channel.

[0015] Optionally, the bottom plate includes a first bottom plate and a second bottom plate, the first bottom plate is connected to the side plate, and the first bottom plate and the side plate are combined to form the accommodating cavity; the second bottom plate is arranged on the side of the first bottom plate facing the accommodating cavity, the glue injection cavity is formed between the first bottom plate and the second bottom plate, and the second bottom plate is provided with the glue injection groove at a position corresponding to each of the battery cells, the groove wall of the glue injection groove is provided with an opening, and the opening connects the glue injection groove and the glue injection cavity.

[0016] Optionally, the accommodating cavity has a cavity opening and a cavity bottom relative to each other, and along the direction from the cavity opening to the cavity bottom, the ratio of the orthographic projection area of ​​the glue injection groove to the orthographic projection area of ​​the battery cell is 0.7 to 0.9.

[0017] Optionally, a combined end plate is further included, wherein the arrangement direction of the battery cells is a first direction, and a second direction is perpendicular to the first direction. The combined end plate is arranged on both sides of the battery cell group along the second direction, one side of the combined end plate abuts against the side wall of the box body, and the other side of the combined end plate abuts against the battery cell group. The combined end plate can be deformed along the second direction to squeeze the battery cell group.

[0018] Optionally, the combined end plate comprises: a first end plate, a second end plate and an adjustment assembly;

[0019] The first end plate and the second end plate are stacked along the second direction, the first end plate abuts against the side wall of the box body, and the second end plate abuts against the battery cell group; the adjustment component is arranged between the first end plate and the second end plate, and the adjustment component is used to adjust the distance between the first end plate and the second end plate so that the second end plate squeezes the battery cell group.

[0020] Optionally, the adjustment assembly comprises: a first adjustment member and a second adjustment member, and the accommodating cavity has a cavity opening and a cavity bottom facing each other;

[0021] The first adjusting member is disposed between the first end plate and the second end plate and close to the cavity bottom, and the second adjusting member is disposed between the first end plate and the second end plate and close to the cavity opening; the first adjusting member and the second adjusting member are respectively used to adjust the distance between the first end plate and the second end plate.

[0022] Optionally, the first adjusting member includes a bolt, an expansion sleeve and a nut, the bolt is fixed between the first end plate and the second end plate and close to the bottom of the cavity, the expansion sleeve is sleeved on the bolt, and the nut is threadedly connected to the bolt. The bolt can move relative to the bolt to squeeze the expansion sleeve, and the expansion sleeve can expand and deform to adjust the distance between the first end plate and the second end plate.

[0023] Optionally, the second adjusting member comprises a wedge-shaped plate, a wedge-shaped space is provided between the first end plate and the second end plate on a side close to the cavity opening, and the wedge-shaped plate is inserted into the wedge-shaped space.

[0024] Optionally, a first latching tooth is provided on a side of the second end plate facing the wedge-shaped space, and a second latching tooth is provided on the wedge-shaped plate, and the first latching tooth is engaged with the second latching tooth.

[0025] In the embodiment of the present application, a plurality of battery cells are arranged in rows in the receiving cavity of the box body, and then the glue injection assembly is extended between two adjacent rows of battery cells to accurately inject glue into the gap between the two rows of battery cells, ensuring that the glue fully flows and fills between the battery cells, thereby improving the uniformity of the glue injection in the battery pack and helping to improve the quality of the battery pack. After the glue injection is completed, the glue injection assembly can be removed so that the glue injection assembly can be reused; or the glue injection assembly can be retained in the battery pack to strengthen the battery pack structure. The glue injection assembly structure in the present application is more flexible to use and can meet the application requirements of different scenarios.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic diagram of the arrangement structure of the glue injection assembly in the battery pack box according to an embodiment of the present application;

[0029] Figure 2 is a schematic diagram of the arrangement structure of the glue injection assembly in the battery pack according to an embodiment of the present application;

[0030] Figure 3 is an exploded view of a battery pack according to an embodiment of the present application;

[0031] Figure 4 This is one of the schematic diagrams of the matching structure between the glue injection assembly and the base plate according to an embodiment of the present application;

[0032] Figure 5 This is a second schematic diagram of the matching structure between the glue injection component and the base plate according to an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of a combined end plate according to an embodiment of the present application;

[0034] Figure 7 is an exploded view of a combined end plate according to an embodiment of the present application;

[0035] Figure 8 is a schematic diagram of a first end plate according to an embodiment of the present application;

[0036] Fig. 9 is a schematic diagram of a second end plate according to an embodiment of the present application;

[0037] Fig.10 is a schematic diagram of a wedge plate according to an embodiment of the present application;

[0038] Fig.11 is a schematic diagram of a first adjusting member according to an embodiment of the present application;

[0039] Fig.12 is an exploded view of the first adjusting member according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 10: box body; 101: accommodating cavity; 102: cavity opening; 103: cavity bottom; 11: side plate; 12: bottom plate; 121: glue injection groove; 1211: opening; 122: glue injection cavity; 123: first bottom plate; 124: second bottom plate; 20: glue injection assembly; 21: first pipeline; 211: glue injection opening; 22: second pipeline; 212: glue outlet; 30: battery cell group; 31: battery cell; 32: Gap; 40: combined end plate; 401: wedge-shaped space; 41: first end plate; 42: second end plate; 421: first latch; 43: adjustment assembly; 431: first adjustment member; 4311: bolt; 4312: expansion sleeve; 4313: nut; 432: second adjustment member; 4321: wedge-shaped plate; 4322: second latch; X: first direction; Y: second direction; Z: third direction. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0043] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The battery pack provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0047] like Figure 1 and Figure 2 As shown, according to some embodiments of the present application, the glue injection component 20 is used to inject glue into a battery pack, and the battery pack includes a box body 10 and a plurality of battery cells 31. The box body 10 is provided with a accommodating cavity 101, and the plurality of battery cells 31 are arranged in rows in the accommodating cavity 101 to form a battery cell group 30, and there is a gap 32 between two adjacent rows of battery cells 31; the glue injection component 20 is arranged at the gap 32, and a glue injection flow channel is provided in the glue injection component 20, and the glue injection flow channel is connected with the accommodating cavity 101, and is used to inject glue into the accommodating cavity 101, and the battery cell group 30 and the glue injection component 20 are both embedded in the glue.

[0048] In the embodiment of the present application, a plurality of battery cells 31 are arranged in rows in the accommodating cavity 101 of the box body 10, and then a glue injection assembly 20 is arranged between two adjacent rows of battery cells 31, so as to use the glue injection assembly 20 to accurately inject glue into the gap 32 between the two rows of battery cells 31, so as to ensure that the glue fully flows and fills between the battery cells 31, thereby improving the uniformity of the glue injection in the battery pack and helping to improve the quality of the battery pack. In addition, after the glue injection assembly 20 completes the glue injection operation, the glue injection assembly 20 is retained in the battery pack. After the glue is cured, the glue injection assembly 20 is embedded in the glue to play the role of a reinforcing rib, which can not only improve the packaging effect of the glue, but also improve the structural strength of the battery pack.

[0049] In another embodiment, if Figure 1 and Figure 2 As shown, the present application provides a battery pack, including a box body 10 and a plurality of battery cells 31, a receiving cavity 101 is provided in the box body 10, a plurality of battery cells 31 are arranged in rows in the receiving cavity 101 to form a battery cell group 30, the receiving cavity 101 is also filled with glue (not shown in the figure), and the battery cell group 30 is embedded in the glue; the glue is suitable for being formed by glue injection using a glue injection component 20, the glue injection component 20 is suitable for at least partially extending between two adjacent rows of battery cells 31, and the glue injection channel in the glue injection component 20 is connected to the receiving cavity 101 to inject glue into the receiving cavity 101.

[0050] In the embodiment of the present application, a plurality of battery cells 31 are arranged in rows in the accommodating cavity 101 of the box body 10, and then the glue injection assembly 20 is extended between two adjacent rows of battery cells 31 to accurately inject glue into the gap 32 between the two rows of battery cells 31, ensuring that the glue fully flows and fills between the battery cells 31, thereby improving the uniformity of glue injection in the battery pack and helping to improve the quality of the battery pack. In addition, after the glue injection assembly 20 completes the glue injection operation, the glue injection assembly 20 can be taken out so as to continue to be used for glue injection of other battery packs, which can improve the reuse rate of the glue injection assembly 20 and reduce the production cost of the battery pack.

[0051] It should be noted that Figure 2 The schematic diagram of the structure of the glue injection assembly 20 in the accommodating cavity during glue injection of the battery pack is shown. After the glue injection is completed, the glue injection assembly 20 can be retained in the battery pack and not taken out. The glue injection assembly 20 can be used as a part of the battery pack, and the battery pack finally prepared includes the glue injection assembly 20. The glue injection assembly 20 can also be taken out of the battery pack to be used for glue injection operations of other battery packs, and the battery pack finally prepared does not include the glue injection assembly 20.

[0052] By adopting the glue injection structure of the present application, after completing the glue injection, you can choose to take out the glue injection component 20 so that the glue injection component can be reused; or keep the glue injection component in the battery pack to strengthen the battery pack structure, which is more convenient and flexible to use and can meet the application needs of different scenarios.

[0053] Among them, after the glue injection is completed, the glue injection component 20 can continue to be retained in the battery pack. After the glue is cured, the glue injection component 20 can play the role of reinforcing ribs in the glue, thereby helping to improve the overall structural strength of the battery pack. The glue injection component 20 can also be removed after the glue injection is completed, and then the glue injection component 20 can continue to be used for glue injection operations of other battery packs, which can improve the reuse rate of the glue injection component 20 and reduce production costs.

[0054] It is understandable that in the conventional battery pack glue filling process, the glue injection head of the glue injection device is usually aligned with the cavity opening 102 of the accommodating cavity 101 of the battery pack case 10 to inject glue into the accommodating cavity 101, so that the glue can flow freely and fill the gaps between the battery cells 31. However, this glue filling method easily leads to uneven glue filling at different positions in the battery pack, which reduces the glue filling quality of the battery pack.

[0055] By using the glue injection component 20 of the present application, the glue injection component 20 can be extended between two adjacent rows of battery cells 31 to perform precise glue injection, which can ensure that the glue is fully filled between the battery cells, thereby improving the uniformity of the glue filling. At the same time, the glue injection component 20 of the present application has a higher selectivity and can meet the needs of different application scenarios.

[0056] Alternatively, if Figure 1 , Figure 4 and Figure 5 As shown, the glue injection component 20 includes a first pipe 21 and a second pipe 22, the accommodating cavity 101 has a cavity opening 102 and a cavity bottom 103 relative to each other, the first pipe 21 extends from the cavity opening 102 to the cavity bottom 103, and the extension direction of the second pipe 22 intersects with the extension direction of the first pipe 21; a first flow channel is provided in the first pipe 21, and a second flow channel is provided in the second pipe 22, and the first flow channel is connected with the second flow channel to form a glue injection flow channel; a glue injection port 211 connected with the first flow channel is provided at one end of the first pipe 21 close to the cavity opening 102, and a glue outlet 212 connected with the second flow channel is provided in the second pipe 22, and the glue outlet 212 is connected with the accommodating cavity 101.

[0057] In the embodiment of the present application, a first pipe 21 and a second pipe 22 are connected to form a glue injection assembly 20, so that the first pipe 21 extends from the cavity opening 102 of the accommodating cavity 101 to the cavity bottom 103, so that the first pipe 21 can be used to connect an external glue injection device, and then the second pipe 22 is connected to the first pipe 21, so that glue can be injected into the accommodating cavity 101 through the glue outlet 212 in the second pipe 22, so as to achieve precise glue injection between the battery cells 31.

[0058] Among them, Figure 2 As shown, the arrangement direction of the multiple battery cells 31 in rows is set to the first direction X, the stacking direction of the multiple battery cells 31 in each row of battery cells 31 is the second direction Y, the direction from the cavity mouth 102 to the cavity bottom 103 of the accommodating cavity 101 is the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0059] Specifically, the glue injection assembly 20 includes a first pipe 21 and a second pipe 22 connected to each other. The first pipe 21 and the second pipe 22 can be arranged between two adjacent rows of battery cells 31, and the first pipe 21 extends along the third direction Z, and the second pipe 22 extends along the second direction Y. The first pipe 21 is provided with a first flow channel extending along the third direction Z, the second pipe 22 is provided with a second flow channel extending along the second direction Y, and a glue injection port 211 is provided at one end of the first pipe 21 close to the cavity 102, and a glue outlet 212 is provided in the second pipe 22.

[0060] When filling the battery pack with glue, the glue injection port 211 of the first pipe 21 can be connected to an external glue injection device, and the glue injection device is used to introduce glue into the first flow channel in the first pipe 21. The glue flows through the second flow channel in the second pipe 22 and is injected from the glue outlet 212 into the space between two adjacent rows of battery cells 31, thereby achieving precise glue injection in the battery pack.

[0061] The shapes and sizes of the first pipe 21 and the second pipe 22 can be determined according to the size of the gap 32 between two adjacent rows of battery cells 31 in the battery pack, and this application does not limit this.

[0062] Alternatively, if Figure 5 As shown, the second pipe 22 is provided with a plurality of glue outlets 212, and the plurality of glue outlets 212 are sequentially arranged at intervals along the extension direction of the second pipe 22. By providing a plurality of glue outlets 212 in the second pipe 22, and making the plurality of glue outlets 212 sequentially arranged at intervals along the extension direction of the second pipe 22 (that is, the second direction Y), the glue entering the second pipe 22 from the first pipe 21 can be simultaneously injected into the space between two adjacent rows of battery cells 31 through the plurality of glue outlets 212, which can improve the glue injection efficiency of the battery pack and improve the glue injection uniformity at different positions in the battery pack.

[0063] It is understandable that the multiple glue outlets 212 in the same second pipe 22 can face the same direction or different directions, and the number of glue outlets 212 in the second pipe 22 and the direction of each glue outlet 212 can be flexibly set, and the present application does not limit this. The direction of the glue outlet 212 refers to the direction in which the glue flows out of the glue outlet 212.

[0064] In some embodiments, Figure 5 As shown, multiple glue outlets 212 can be simultaneously directed toward the bottom 103 of the accommodating cavity 101, so that the glue flowing out of the glue outlet 212 is first filled into the bottom 103 of the accommodating cavity 101, and then gradually fills up the space in the accommodating cavity 101 except the battery cell 31, to ensure that the entire accommodating cavity 101 is evenly filled with glue.

[0065] In other embodiments, the plurality of glue outlets 212 may face different directions, for example, a portion of the glue outlets 212 face the cavity bottom 103 of the accommodating cavity 101, a portion of the glue outlets 212 face one side of the second pipe 22 along the first direction X, and another portion of the glue outlets 212 face the other side of the second pipe 22 along the first direction X. In this way, after the glue flows out of the second pipe 22, it can flow to different positions around the second pipe 22, which helps to improve the uniformity of glue injection.

[0066] Alternatively, if Figure 4 and Figure 5 As shown, the glue injection assembly 20 is provided with a plurality of first pipes 21 , which are arranged in sequence along the extension direction of the second pipe 22 (ie, the second direction Y), and at least one glue outlet 212 is provided between two adjacent first pipes 21 .

[0067] In the embodiment of the present application, multiple first pipes 21 are provided so that the multiple first pipes 21 are arranged in sequence and spaced apart along the extension direction of the second pipe 22 (that is, the second direction Y), and each first pipe 21 can be connected to a glue injection device, so that glue can be introduced into the second pipe 22 through the multiple first pipes 21 at the same time, and the glue introduced into the multiple first pipes 21 can flow and mix in the second pipe 22 to improve the uniformity of the glue.

[0068] In addition, the second pipe 22 is provided with at least one glue outlet 212 between every two adjacent first pipes 21, so that the glue entering the second pipe 22 from the first pipe 21 can flow out into the accommodating cavity 101 nearby, thereby shortening the flow path of the glue in the glue injection channel, thereby improving the glue injection efficiency.

[0069] Alternatively, if Figure 2 As shown, at least one glue injection assembly 20 is provided between every two rows of battery cells 31 .

[0070] Specifically, the battery pack is provided with multiple rows of battery cells 31. At least one glue injection assembly 20 is provided between every two rows of battery cells 31 to ensure that glue can be accurately injected between every two rows of battery cells 31, which can not only improve the efficiency of glue injection, but also improve the uniformity of glue injection. In addition, after the glue injection is completed, the glue injection assembly 20 is retained between the battery cells 31, so that the glue injection assembly 20 is provided between every two rows of battery cells 31 to play the role of reinforcing ribs, thereby improving the overall structural strength of the battery pack.

[0071] Alternatively, if Figures 1 to 3 As shown, the box body 10 includes a side panel 11 and a bottom panel 12. The side panel 11 and the bottom panel 12 enclose a receiving cavity 101. The bottom panel 12 is provided with a glue injection groove 121 at a position corresponding to each battery cell 31. A glue injection cavity 122 is provided in the bottom panel 12. The glue injection groove 121 is connected to the glue injection cavity 122, and the glue injection cavity 122 is connected to the glue injection channel.

[0072] In the embodiment of the present application, a plurality of glue injection grooves 121 are arranged in the bottom plate 12 of the box body 10, so that the bottom of each battery cell 31 corresponds to a glue injection groove 121, and a glue injection cavity 122 is arranged in the bottom plate 12, each glue injection groove 121 is connected to the glue injection cavity 122, and then, the glue injection cavity 122 is connected to the glue injection channel in the glue injection component 20, so that the glue injection component 20 can be used to inject glue into each glue injection groove 121 through the glue injection cavity 122, so as to use the sealing glue to bond and fix the bottom of each battery cell 31.

[0073] It is understandable that the base plate 12 in the present application can be an integrated structure or a split structure, and can be flexibly configured according to actual conditions, and is not limited here.

[0074] Alternatively, if Figures 3 to 5As shown, the bottom plate 12 includes a first bottom plate 123 and a second bottom plate 124, the first bottom plate 123 is connected to the side plate 11, and the first bottom plate 123 and the side plate 11 enclose a accommodating cavity 101; the second bottom plate 124 is arranged on the side of the first bottom plate 123 facing the accommodating cavity 101, and a glue injection cavity 122 is formed between the first bottom plate 123 and the second bottom plate 124, and the second bottom plate 124 is provided with a glue injection groove 121 at a position corresponding to each battery cell 31, and the groove wall of the glue injection groove 121 is provided with an opening 1211, and the opening 1211 connects the glue injection groove 121 and the glue injection cavity 122.

[0075] In the embodiment of the present application, the base plate 12 can adopt a split structure, specifically including a first base plate 123 and a second base plate 124, a glue injection cavity 122 is formed between the first base plate 123 and the second base plate 124, and a plurality of glue injection grooves 121 are arranged in the second base plate 124, so that the glue injection grooves 121 correspond one-to-one to the battery cells 31. In this way, while meeting the structural design requirements of the base plate 12, actual processing and manufacturing are facilitated.

[0076] Specifically, the first bottom plate 123 and the second bottom plate 124 are stacked, the first bottom plate 123 is fixedly connected to the side plate 11 to enclose a accommodating cavity 101, the second bottom plate 124 is arranged on the side of the first bottom plate 123 facing the accommodating cavity 101, and a gap 32 is provided between the first bottom plate 123 and the second bottom plate 124 so that the glue injection cavity 122 is formed by the gap 32.

[0077] Furthermore, a plurality of recessed structures are provided in the second bottom plate 124. The recessed structures are recessed from a side surface of the second bottom plate 124 toward the accommodating cavity 101 toward the first bottom plate 123, and are enclosed with the first bottom plate 123 to form a glue injection groove 121. An opening 1211 is provided in the groove wall of the glue injection groove 121 to connect the glue injection groove 121 with the glue injection cavity 122 by utilizing the opening 1211.

[0078] The position and size of the glue injection groove 121 formed in the second bottom plate 124 can be determined according to the position and size of the battery cell 31 in the battery pack, which is not limited here.

[0079] In some embodiments, the depth of the glue injection groove 121 is less than or equal to 2.5 mm. For example, the depth of the glue injection groove 121 can be set to 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.5 mm, etc. It is understandable that if the depth of the glue injection groove 121 is too large, the thickness of the corresponding bottom plate 12 needs to be increased accordingly, which will occupy the space of the accommodating cavity 101 in the box body 10 and affect the energy density of the battery pack.

[0080] Alternatively, if Figure 3As shown, along the direction from the cavity opening 102 to the cavity bottom 103 (i.e., the third direction Z), the ratio of the orthographic projection area of ​​the injection groove 121 to the orthographic projection area of ​​the battery cell 31 is 0.7 to 0.9. Exemplarily, the ratio can be set to 0.7, 0.75, 0.8, 0.85, 0.9, etc.

[0081] In the embodiment of the present application, by setting a reasonable ratio between the orthographic projection area of ​​the glue injection groove 121 and the orthographic projection area of ​​the battery cell 31, it can be ensured that sufficient glue is filled at the bottom of each battery cell 31 to play a role in packaging and fixing the bottom of the battery cell 31. At the same time, it is avoided that the size of the glue injection groove 121 is too large, which affects the supporting effect of the bottom plate 12 on the battery cell 31.

[0082] It is understandable that when the glue injection groove 121 is set at the bottom of each battery cell 31, it is necessary to ensure that a portion of the bottom plate 12 left around the glue injection groove 121 can contact the bottom of the battery cell 31 to support the battery cell 31. If the glue injection groove 121 is set too large, the bottom of the battery cell 31 will fall into the glue injection groove 121, so that the bottom plate 12 cannot effectively support the battery cell 31. If the glue injection groove 121 is set too small, too little glue is poured at the bottom of the battery cell 31, and it cannot play a good packaging and fixing role.

[0083] Alternatively, if Figure 3 As shown, the battery pack also includes a combined end plate 40, the battery cells 31 are arranged in a first direction X, the second direction Y is perpendicular to the first direction X, the combined end plate 40 is arranged on both sides of the battery cell group 30 along the second direction Y, one side of the combined end plate 40 abuts against the side wall of the box body 10, and the other side of the combined end plate 40 abuts against the battery cell group 30, and the combined end plate 40 can be deformed along the second direction Y to squeeze the battery cell group 30.

[0084] In the embodiment of the present application, by setting a combined end plate 40 between the battery cell group 30 and the side wall of the box body 10, the combined end plate 40 can be deformed along the second direction Y, and then the battery cells 31 can be squeezed and pre-tightened from both sides to fix the position of the battery cell group 30, thereby avoiding large displacement of the battery cell group 30 during assembly and use.

[0085] Specifically, a plurality of cells 31 are arranged in rows in the accommodating cavity 101 of the box 10 to form a cell group 30, and the stacking direction of the plurality of cells 31 in each row of cells 31 is the second direction Y. Combined end plates 40 are respectively provided on both sides of the cell group 30 along the second direction Y, and one side of the combined end plate 40 abuts against the side wall of the box 10, and the other side abuts against the cell group 30. Furthermore, the combined end plate 40 can be deformed along the second direction Y, and the deformation of the combined end plate 40 can form an extrusion effect on the cell group 30, so as to achieve pre-tightening and fixing of the cells 31 in the cell group 30.

[0086] Alternatively, if Figure 3 As shown, the combined end plate 40 includes: a first end plate 41, a second end plate 42 and an adjustment assembly 43; the first end plate 41 and the second end plate 42 are stacked along the second direction Y, the first end plate 41 abuts against the side wall of the box body 10, and the second end plate 42 abuts against the battery cell group 30; the adjustment assembly 43 is arranged between the first end plate 41 and the second end plate 42, and the adjustment assembly 43 is used to adjust the distance between the first end plate 41 and the second end plate 42 so that the second end plate 42 squeezes the battery cell group 30.

[0087] In the embodiment of the present application, the first end plate 41 and the second end plate 42 are stacked along the second direction Y between the battery cell group 30 and the side wall of the box body 10, and an adjustment component 43 is provided between the first end plate 41 and the second end plate 42. The distance between the first end plate 41 and the second end plate 42 can be adjusted by the adjustment component 43, so as to flexibly adjust the size of the pre-tightening force formed by the combined end plate 40 on the battery cell group 30, thereby ensuring the pre-tightening and fixing effect of the combined end plate 40 on the battery cell group 30, and avoiding excessive squeezing force of the combined end plate 40 on the battery cell group 30 to cause damage to the battery cell 31.

[0088] Alternatively, if Figure 3 As shown, the adjustment component 43 includes: a first adjustment member 431 and a second adjustment member 432, and the accommodating cavity 101 has a relative cavity opening 102 and a cavity bottom 103; the first adjustment member 431 is arranged between the first end plate 41 and the second end plate 42 and close to the cavity bottom 103, and the second adjustment member 432 is arranged between the first end plate 41 and the second end plate 42 and close to the cavity opening 102; the first adjustment member 431 and the second adjustment member 432 are respectively used to adjust the distance between the first end plate 41 and the second end plate 42.

[0089] In the embodiment of the present application, a first adjusting member 431 and a second adjusting member 432 are provided between the first end plate 41 and the second end plate 42, and the first adjusting member 431 is placed close to the cavity bottom 103 of the accommodating cavity 101, and the second adjusting member 432 is placed close to the cavity opening 102 of the accommodating cavity 101. In this way, the spacing between the first end plate 41 and the second end plate 42 close to the cavity bottom 103 can be adjusted by the first adjusting member 431, and the spacing between the first end plate 41 and the second end plate 42 close to the cavity opening 102 can be adjusted by the second adjusting member 432, so that the preload force of the combined end plate 40 on different positions of the battery cell group 30 can be accurately adjusted.

[0090] Alternatively, if Figure 7 , Fig.11 and Fig.12As shown, the first adjusting member 431 includes a bolt 4311, an expansion sleeve 4312 and a nut 4313. The bolt 4311 is fixed between the first end plate 41 and the second end plate 42 and close to the cavity bottom 103. The expansion sleeve 4312 is sleeved on the bolt 4311. The nut 4313 is threadedly connected to the bolt 4311. The bolt 4311 can move relative to the bolt 4311 to squeeze the expansion sleeve 4312. The expansion sleeve 4312 can expand and deform to adjust the distance between the first end plate 41 and the second end plate 42.

[0091] In the embodiment of the present application, the first adjusting member 431 adopts an expansion bolt structure, the bolt 4311 is arranged between the first end plate 41 and the second end plate 42, and the nut 4313 is threadedly connected to the bolt 4311. By screwing the nut 4313, the expansion sleeve 4312 is squeezed by the nut 4313 and the bolt 4311, so that the expansion sleeve 4312 is deformed, and then the side of the second end plate 42 close to the cavity bottom 103 is pushed toward the direction away from the first end plate 41, thereby adjusting the extrusion pre-tightening effect of the second end plate 42 on the lower end of the battery cell group 30.

[0092] In some embodiments, Figures 7 to 9 As shown, by providing a plurality of first adjusting members 431 between the first end plate 41 and the second end plate 42, the plurality of first adjusting members 431 are arranged in sequence along the first direction X. Furthermore, by the joint action of the plurality of first adjusting members 431, the spacing at different positions between the first end plate 41 and the second end plate 42 can be accurately adjusted, so that the combined end plate 40 forms a uniform extrusion pre-tightening effect on the battery cell group 30.

[0093] Alternatively, if Figure 7 As shown, the second adjusting member 432 includes a wedge-shaped plate 4321 , and a wedge-shaped space 401 is provided between the first end plate 41 and the second end plate 42 on one side close to the cavity opening 102 , and the wedge-shaped plate 4321 is inserted into the wedge-shaped space 401 .

[0094] In the embodiment of the present application, a wedge-shaped space 401 is provided between the first end plate 41 and the second end plate 42 on a side close to the cavity opening 102. By inserting the wedge-shaped plate 4321 into the wedge-shaped space 401 and adjusting the size of the extended portion of the wedge-shaped plate 4321, the distance between the first end plate 41 and the second end plate 42 on a side close to the cavity opening 102 can be adjusted, thereby adjusting the extrusion pre-tightening effect of the second end plate 42 on the upper end of the battery cell group 30.

[0095] The upper end of the battery cell group 30 refers to an end of the battery cell group 30 close to the cavity opening 102 of the accommodating cavity 101 , and the lower end of the battery cell group 30 refers to an end of the battery cell group 30 close to the cavity bottom 103 of the accommodating cavity 101 .

[0096] In some embodiments, the cross-section of the wedge plate 4321 is in a triangular, trapezoidal, quasi-triangular or trapezoidal structure, etc., and can be flexibly set according to actual needs and is not limited here.

[0097] Alternatively, if Figure 7 , Fig. 9 and Fig.10 As shown, a first latching tooth 421 is provided on one side of the second end plate 42 facing the wedge-shaped space 401 , and a second latching tooth 4322 is provided on the wedge-shaped plate 4321 , and the first latching tooth 421 is engaged with the second latching tooth 4322 .

[0098] In the embodiment of the present application, a first latching tooth 421 is provided on the second end plate 42, and a second latching tooth 4322 is provided on the wedge plate 4321. After the wedge plate 4321 is inserted into the wedge-shaped space 401, the first latching tooth 421 and the second latching tooth 4322 are engaged with each other, so that the position of the wedge plate 4321 can be fixed to prevent the wedge plate 4321 from falling out of the wedge-shaped space 401.

[0099] In some embodiments, Fig. 9 and Fig.10 As shown, the number of second teeth 4322 in the wedge plate 4321 is multiple, and the multiple second teeth 4322 are arranged along the third direction Z. The first teeth 421 on the second end plate 42 correspond to the second teeth 4322 in the wedge plate 4321 .

[0100] In some embodiments, Figure 2 and Figure 3 As shown, the preparation process of the battery pack in the embodiment of the present application includes the following:

[0101] First, the first bottom plate 123 and the second bottom plate 124 are assembled with the side plate 11 to form a box body 10, and a plurality of battery cells 31 are arranged in rows along a first direction X in the accommodating cavity 101 of the box body 10 to form a battery cell group 30, and a combined end plate 40 is arranged between the two sides of the battery cell group 30 along the second direction Y and the side wall of the box body 10.

[0102] When the combined end plate 40 is arranged, the first end plate 41 and the second end plate 42 are first stacked along the second direction Y, the first end plate 41 abuts against the side wall of the box body 10, the second end plate 42 abuts against the battery cell group 30, and a plurality of first adjustment members 431 are arranged between the first end plate 41 and the second end plate 42 on the side close to the cavity bottom 103 of the accommodating cavity 101. By tightening the nut 4313, the expansion sleeve 4312 is squeezed and deformed, so as to push the lower end of the second end plate 42 to squeeze the battery cell group 30.

[0103] Then, the wedge plate 4321 is inserted into the wedge-shaped space 401 between the first end plate 41 and the second end plate 42. With the insertion of the wedge plate 4321, the first end plate 41 and the second end plate 42 can be stretched apart to push the upper end of the second end plate 42 to squeeze the battery cell group 30.

[0104] Then, the glue injection assembly 20 is installed between two adjacent rows of battery cells 31, and the lower end of the first pipe 21 is connected to the glue injection cavity 122 in the bottom plate 12, so that glue is introduced into the glue injection flow channel in the glue injection assembly 20 through the glue injection equipment, and a part of the glue is injected into the gap 32 between the two rows of battery cells 31 through the glue outlet 212 of the second pipe 22, and overflows into the gap between the box body 10 and the battery cell 31; another part of the glue is injected into the glue injection groove 121 at the bottom of the battery cell 31 through the glue injection cavity 122 in the bottom plate 12, so as to realize the battery pack glue filling operation. Furthermore, after the glue injection is completed, the glue injection assembly 20 can be taken out, or the glue injection assembly 20 can be kept in the box body 10.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer 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 in a suitable manner.

[0106] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: The invention comprises a box (10), a glue injection assembly (20) and a plurality of battery cells (31), wherein a receiving cavity (101) is provided in the box (10), and a plurality of battery cells (31) are arranged in rows in the receiving cavity (101) to form a battery cell group (30), and a gap (32) exists between two adjacent rows of battery cells (31); The glue injection component (20) is arranged at the gap (32), and a glue injection flow channel is provided in the glue injection component (20), the glue injection flow channel is communicated with the accommodating cavity (101), and is used for injecting glue into the accommodating cavity (101), and the battery cell group (30) and the glue injection component (20) are both embedded in the glue.

2. A battery pack, characterized in that: The invention comprises a box body (10) and a plurality of battery cells (31), wherein a receiving cavity (101) is provided in the box body (10), and the plurality of battery cells (31) are arranged in a row in the receiving cavity (101) to form a battery cell group (30); the receiving cavity (101) is also filled with glue, and the battery cell group (30) is embedded in the glue; the glue is suitable for being formed by glue injection using a glue injection component (20), and the glue injection component (20) is suitable for at least partially extending between two adjacent rows of battery cells (31), and a glue injection channel in the glue injection component (20) is connected to the receiving cavity (101) so as to inject glue into the receiving cavity (101).

3. The battery pack according to claim 1 or 2, characterized in that: The glue injection assembly (20) comprises a first pipe (21) and a second pipe (22); the accommodating cavity (101) has a cavity opening (102) and a cavity bottom (103) opposite to each other; the first pipe (21) extends from the cavity opening (102) to the cavity bottom (103); and the extension direction of the second pipe (22) intersects with the extension direction of the first pipe (21); A first flow channel is provided in the first pipe (21), a second flow channel is provided in the second pipe (22), and the first flow channel is connected to the second flow channel to form the glue injection flow channel; an end of the first pipe (21) close to the cavity opening (102) is provided with a glue injection port (211) connected to the first flow channel, and the second pipe (22) is provided with a glue outlet (212) connected to the second flow channel, and the glue outlet (212) is connected to the accommodating cavity (101).

4. The battery pack according to claim 3, characterized in that: The second pipe (22) is provided with a plurality of the glue outlets (212), and the plurality of the glue outlets (212) are sequentially spaced apart along the extension direction of the second pipe (22).

5. The battery pack according to claim 3, characterized in that: The glue outlet (212) faces the cavity bottom (103).

6. The battery pack according to claim 3, characterized in that: The glue injection assembly (20) is provided with a plurality of the first pipes (21), the plurality of the first pipes (21) are sequentially spaced apart along the extension direction of the second pipe (22), and at least one glue outlet (212) is provided between two adjacent first pipes (21).

7. The battery pack according to claim 1 or 2, characterized in that: At least one glue injection assembly (20) is provided between every two rows of battery cells (31).

8. The battery pack according to claim 1 or 2, characterized in that: The box body (10) comprises a side plate (11) and a bottom plate (12); the side plate (11) and the bottom plate (12) are combined to form the accommodating cavity (101); the bottom plate (12) is provided with a glue injection groove (121) at a position corresponding to each of the battery cells (31); a glue injection cavity (122) is provided in the bottom plate (12); the glue injection groove (121) is in communication with the glue injection cavity (122); and the glue injection cavity (122) is in communication with the glue injection flow channel.

9. The battery pack according to claim 8, characterized in that: The bottom plate (12) comprises a first bottom plate (123) and a second bottom plate (124); the first bottom plate (123) is connected to the side plate (11); the first bottom plate (123) and the side plate (11) are enclosed to form the accommodating cavity (101); the second bottom plate (124) is arranged on a side of the first bottom plate (123) facing the accommodating cavity (101); the glue injection cavity (122) is formed between the first bottom plate (123) and the second bottom plate (124); the second bottom plate (124) is provided with a glue injection groove (121) at a position corresponding to each of the battery cells (31); the groove wall of the glue injection groove (121) is provided with an opening (1211); the opening (1211) connects the glue injection groove (121) with the glue injection cavity (122).

10. The battery pack according to claim 8, characterized in that: The accommodating cavity (101) has a cavity opening (102) and a cavity bottom (103) that are opposite to each other, and along the direction from the cavity opening (102) to the cavity bottom (103), the ratio of the orthographic projection area of ​​the glue injection groove (121) to the orthographic projection area of ​​the battery cell (31) is 0.7 to 0.

9.

11. The battery pack according to claim 1 or 2, characterized in that: It also includes a combined end plate (40), wherein the direction in which the battery cells (31) are arranged in a row is a first direction (X), and a second direction (Y) is perpendicular to the first direction (X). The combined end plate (40) is arranged on both sides of the battery cell group (30) along the second direction (Y), one side of the combined end plate (40) abuts against the side wall of the box body (10), and the other side of the combined end plate (40) abuts against the battery cell group (30), and the combined end plate (40) can be deformed along the second direction (Y) to form an extrusion on the battery cell group (30).

12. The battery pack according to claim 11, characterized in that: The combined end plate (40) comprises: a first end plate (41), a second end plate (42) and an adjustment assembly (43); The first end plate (41) and the second end plate (42) are stacked along the second direction (Y), the first end plate (41) abuts against the side wall of the box body (10), and the second end plate (42) abuts against the battery cell group (30); the adjustment component (43) is arranged between the first end plate (41) and the second end plate (42), and the adjustment component (43) is used to adjust the distance between the first end plate (41) and the second end plate (42) so that the second end plate (42) squeezes the battery cell group (30).

13. The battery pack according to claim 12, characterized in that: The adjustment assembly (43) comprises: a first adjustment member (431) and a second adjustment member (432); the accommodating cavity (101) has a cavity opening (102) and a cavity bottom (103) which are opposite to each other; The first adjusting member (431) is disposed between the first end plate (41) and the second end plate (42) and is close to the cavity bottom (103); the second adjusting member (432) is disposed between the first end plate (41) and the second end plate (42) and is close to the cavity opening (102); the first adjusting member (431) and the second adjusting member (432) are respectively used to adjust the distance between the first end plate (41) and the second end plate (42).

14. The battery pack according to claim 13, characterized in that: The first adjusting member (431) includes a bolt (4311), an expansion sleeve (4312) and a nut (4313), wherein the bolt (4311) is fixed between the first end plate (41) and the second end plate (42) and close to the cavity bottom (103), the expansion sleeve (4312) is sleeved on the bolt (4311), and the nut (4313) is threadedly connected to the bolt (4311), and the bolt (4311) can move relative to the bolt (4311) to squeeze the expansion sleeve (4312), and the expansion sleeve (4312) can expand and deform to adjust the distance between the first end plate (41) and the second end plate (42).

15. The battery pack according to claim 13, characterized in that: The second adjusting member (432) comprises a wedge-shaped plate (4321), and a wedge-shaped space (401) is provided between the first end plate (41) and the second end plate (42) on one side close to the cavity opening (102), and the wedge-shaped plate (4321) is inserted into the wedge-shaped space (401).

16. The battery pack according to claim 15, characterized in that: A first latching tooth (421) is provided on a side of the second end plate (42) facing the wedge-shaped space (401), and a second latching tooth (4322) is provided on the wedge-shaped plate (4321), and the first latching tooth (421) is engaged with the second latching tooth (4322).

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