Battery pack and electric device

Abstract

The utility model provides a battery pack and power utilization device, the battery pack comprises a lower shell with a plurality of mounting cavities and a plurality of battery cell units respectively arranged in the mounting cavities, and a gap is formed between at least one end of each battery cell unit and the inner wall of the mounting cavity in the thickness direction of a battery cell. At least one end of the battery cell unit is provided with a bag body, and the bag body can be filled with colloid to fill the corresponding gap. According to the battery pack disclosed by the utility model, the bag body is arranged at at least one end of the battery cell unit, and the colloid is filled in the bag body, so that the corresponding gap can be filled by the colloid, and compared with the scheme adopting a vacuum bag and foam in the prior art, the battery pack has the advantage of easiness in operation and implementation, thereby being beneficial to improving the assembling efficiency of the battery pack; and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack. At the same time, the utility model also relates to an electric device equipped with the battery pack. Background Art

[0002] CTP (Cell To PACK) modules are highly praised by the power battery industry for their high energy density and high volume occupancy. Blade cells, due to their special structure, can maximize the use of PACK (PACK generally refers to a combined battery cell group, including packaging, encapsulation and assembly) product space to achieve maximum volume utilization.

[0003] However, when the bottom of the CTP module is installed into the mounting cavity on the lower shell of the battery pack, there are reserved gaps between the two ends of the battery cell unit in the thickness direction and the two ends of the mounting cavity. This causes serious inconsistency between the expansion space at the end of the module and the expansion space in the middle part, resulting in energy problems with the battery cell.

[0004] In order to solve the above technical problems, most of the existing technologies use pre-compressed buffer foam in a vacuum bag and put the foam into the gap at the end of the module. After the foam is installed in place, the vacuum bag is punctured and the gap is filled by the rebound of the foam. However, when implementing this method of filling the gap with foam, it is necessary to first measure the gap and then determine the specifications of the foam according to the size of the gap. The whole process is relatively cumbersome and easily leads to waste of production costs such as human resources. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery pack, which is conducive to filling the gap between the end of the battery cell unit and the lower shell, and is easy to operate.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery pack comprises a lower shell having a plurality of mounting cavities, and a plurality of battery cell units respectively arranged in each of the mounting cavities, wherein the battery cell units comprise a plurality of battery cells arranged side by side, and in the thickness direction of the battery cells, gaps are formed between the two ends of each of the battery cell units and the inner wall of the mounting cavity, and a bag body is provided at least at one end of the battery cell unit, and a colloid can be loaded into the bag body to fill the corresponding gap.

[0008] Furthermore, the top of the bag body is provided with a glue injection port for injecting the colloid, and a monitoring port for inserting an external liquid level detection unit; after the colloid reaches the target liquid level, the glue injection port and the monitoring port are closed.

[0009] Furthermore, the glue injection port and the monitoring port are arranged at two ends of the top of the bag body relatively; and / or, a plurality of glue injection ports are arranged on the top of the bag body.

[0010] Furthermore, the colloid is foaming glue or glue; and / or, the gap is provided between both ends of the battery cell unit and the installation cavity, and the bag body is provided at both ends of the battery cell unit.

[0011] Furthermore, both ends of the battery cell unit are respectively provided with a heat preservation sheet and an insulating sheet located outside each of the heat preservation sheets, and the bag body is arranged between the heat preservation sheet and the insulating sheet.

[0012] Furthermore, it also includes a busbar bracket and a connector bracket for mounting the connector;

[0013] The connector bracket has a connecting portion connected to one end of the bus bracket, an FPC and an installation portion for installing the FPC connector, and the installation portion can be flipped relative to the connecting portion so that the installation portion has an initial position coplanar with the connecting portion, and is flipped to an installation position at the end of the battery cell unit.

[0014] Furthermore, the connecting portion and the mounting portion are connected via a thinning structure;

[0015] When in the installation position, the installation portion is disconnected from the connecting portion.

[0016] Furthermore, the thinned portion includes a plurality of thinned connecting ribs arranged at intervals.

[0017] Furthermore, a clamping portion is provided on the mounting portion, and the mounting portion is clamped on the lower shell through the clamping portion.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The battery pack described in the utility model, by arranging a bag body at at least one end of the battery cell unit and loading a colloid into the bag body, can fill the corresponding gap by solidification of the colloid. Compared with the solution using vacuum bags and foam in the prior art, there is no need to measure the gap, and it has the advantage of easy operation and implementation, which is beneficial to improving the battery pack assembly efficiency, saving production costs, and improving the consistency of the expansion space in the middle and end parts of the battery cell unit.

[0020] In addition, by providing a glue injection port at the top of the bag body, it is convenient to inject the colloid into the bag body, and by providing a monitoring port, it is convenient to insert the external liquid level detection unit, so as to detect the amount of colloid injected into the bag body. The glue injection port and the monitoring port are provided at both ends of the bag body, which is convenient for both use; by providing multiple glue injection ports, it is convenient to improve the injection efficiency of the colloid into the bag body. Both the foam glue and the colloid are conducive to achieving the effect of filling the gap by curing; by providing bags at both ends of the battery cell unit, it is convenient to further improve the consistency of the expansion space in the middle and end of the battery cell unit, and it is convenient to improve the assembly efficiency of the battery pack. The provision of the thermal insulation sheet and the insulating sheet is conducive to improving the safety of the battery pack.

[0021] In addition, the mounting portion in the connector bracket can be flipped relative to the connecting portion and has an initial position and an installation position, which is conducive to improving the convenience of installing the battery cell unit. The connecting portion and the mounting portion are connected by a thinning structure, and the mounting portion is disconnected from the connecting portion in the installation position, which is conducive to improving the convenience of connector installation. Multiple thinned connecting ribs cooperate together to ensure that the mounting portion is disconnected from the connecting portion. The mounting portion is clamped to the lower shell by a clamping portion, which is conducive to improving the convenience of installing the mounting portion.

[0022] In addition, another object of the present invention is to provide an electrical device, in which the battery pack as described above is provided.

[0023] The electric device of the utility model is beneficial to improving the electric performance of the electric device and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 This is a disassembled diagram of the battery cell unit described in an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the bag body described in an embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of the structure of the bus bracket, FPC and connector bracket according to the embodiment of the utility model;

[0028] Figure 4 This is a schematic structural diagram of a connector bracket according to an embodiment of the utility model;

[0029] Figure 5 for Figure 4 Enlarged view of section C in .

[0030] Description of reference numerals:

[0031] 1. Battery cell; 2. Bag body; 3. Insulation sheet; 4. Insulation sheet; 5. Cover plate; 6. Bus bracket; 7. Connector bracket; 8. FPC;

[0032] 100. Battery cell unit;

[0033] 201, glue injection port; 202, monitoring port; 203, sealing edge;

[0034] 601, bus;

[0035] 701, connecting part; 702, mounting part; 703, slot; 704, clamp; 705, connecting rib; 706, positioning column;

[0036] A. Initial position; B. Installation position. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0038] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] This embodiment relates to a battery pack, which comprises a lower shell having a plurality of mounting cavities and a plurality of battery cell units 100 respectively arranged in each mounting cavity. In the thickness direction of the battery cell 1, a gap is formed between at least one end of each battery cell unit 100 and the inner wall of the mounting cavity. A bag body 2 is provided at at least one end of the battery cell unit 100, and a colloid can be loaded into the bag body 2 to fill the corresponding gap.

[0041] The battery pack of this embodiment provides a bag body 2 at at least one end of the battery cell unit 100, and fills the bag body 2 with colloid, so that the corresponding gap can be filled by solidification of the colloid. Compared with the solution using vacuum bags and foam in the prior art, there is no need to measure the gap, and it has the advantage of easy operation and implementation, which is beneficial to improving the battery pack assembly efficiency, saving production costs, and improving the consistency of the expansion space in the middle and end parts of the battery cell unit 100.

[0042] Based on the above overall introduction, an exemplary structure of a battery cell in the battery pack in this embodiment is as follows: Figure 1 As shown in the figure, there are two battery cell units 100, and the number of battery cells 1 in each battery cell unit 100 can be determined according to the use requirements. The two battery cell units 100 are respectively connected to the cover plates 5 at both ends of the battery cells 1 in the length direction.

[0043] As a preferred embodiment, gaps are provided between both ends of the battery cell unit 100 and the installation cavity, and both ends of the battery cell unit 100 are provided with bag bodies 2. Here, by providing bag bodies 2 at both ends of the battery cell unit 100, the consistency of the expansion space in the middle and ends of the battery cell unit 100 is further improved, and the assembly efficiency of the battery pack is improved.

[0044] like Figure 1 As shown in , a bag body 2 is provided at both ends of the battery cell unit 100. By providing a bag body 2 at both ends of the battery cell unit 100, it is beneficial to further improve the consistency of the expansion space in the middle and end of the battery cell unit 100, improve the performance of the battery pack, and improve the assembly efficiency of the battery pack. Specifically, a thermal insulation sheet 3 and an insulating sheet 4 located outside each thermal insulation sheet 3 are provided at both ends of the battery cell unit 100, and the bag body 2 is provided between the thermal insulation sheet 3 and the insulating sheet 4. Among them, the provision of the thermal insulation sheet 3 is beneficial to reducing the impact on the end structure when the battery cell 1 has thermal runaway, and the provision of the insulating sheet 4 is beneficial to improving the safety of the battery pack.

[0045] In this embodiment, Figure 2 As shown in , the top of the bag body 2 is provided with a glue injection port 201 for injecting colloid, and a monitoring port 202 for inserting an external liquid level detection unit. By providing the glue injection port 201 at the top of the bag body 2, it is convenient to inject the colloid into the bag body 2, and by providing the monitoring port 202, it is convenient to insert the external liquid level detection unit, so as to detect the injection amount of the colloid in the bag body 2. Preferably, the glue injection port 201 and the monitoring port 202 are relatively arranged at the two ends of the top of the bag body 2. The glue injection port 201 and the monitoring port 202 are arranged at the two ends of the bag body 2, which is convenient for the use of both, and also helps to prevent the problem of glue overflow at other positions of the bag body 2.

[0046] The external liquid level detection device in this embodiment can be a product in the prior art, which has a probe that can be inserted into the bag body 2 through the monitoring port 202. When the liquid level of the colloid reaches the target position, the probe detects the colloid, which can be used as a basis for stopping the injection of the colloid into the bag body 2. After the colloid in the bag body 2 reaches the target liquid level, the injection port 201 and the monitoring port 202 are closed.

[0047] It should be noted that, in addition to using Figure 2 In the scheme shown in the figure, only one injection port 201 is provided. A plurality of injection ports 201 may be provided on the top of the bag body 2, which is conducive to improving the injection efficiency of the colloid in the bag body 2. In addition, in the specific implementation, the colloid is a foam glue or a structural glue, both of which have a good filling effect. Among them, when using foam glue, it is only necessary to confirm the filling height of the foam glue according to the foaming ratio of the foam glue. In addition, since the foam glue will expand to form a foam structure, in addition to having the effect of filling the gap, it is also conducive to improving the heat insulation effect of the end of the battery cell unit 100.

[0048] Compared with the solution of combining vacuum bag and foam in the prior art, the solution of loading colloid into the bag body 2 in the present embodiment does not require gap measurement, vacuuming of the vacuum bag, etc., thereby simplifying the gap filling process and having a better use effect.

[0049] In specific implementation, the shape of the bag body 2 is preferably adapted to the shape of the battery cell 1 to further improve the filling effect of the gap. As an example of a structure of the bag body 2, Figure 2 As shown in , after the bag body 2 is folded from the middle of the main body, the two ends and the top of the bag body 2 are sealed to form a sealing edge 203. The above-mentioned injection port 201 and monitoring port 202 can be processed and formed by cutting, and sealed by thermoplastic means.

[0050] As a preferred embodiment, Figure 3 and Figure 4 As shown in , the battery pack of this embodiment also includes a bus bracket 6, an FPC8, and a connector bracket 7 for installing a connector. The connector bracket 7 has a connecting portion 701 connected to one end of the bus bracket 6, and a mounting portion 702 for mounting the FPC8 connector. And the mounting portion 702 can be flipped relative to the connecting portion 701, so that the mounting portion 702 has an initial position A coplanarly arranged with the connecting portion 701, and flipped to the mounting position B at the end of the battery cell unit 100. Here, the mounting portion 702 in the connector bracket 7 can be flipped relative to the connecting portion 701, and has a mounting position B and a working position, which is conducive to improving the convenience of installing the battery cell unit 100.

[0051] like Figure 3As shown in the figure, in the length direction of the battery cell 1, the busbar bracket 6 is arranged at the end of the battery cell unit 100, the FPC8 is L-shaped, and has a first part arranged corresponding to the busbar bracket 6, and a second part located at one end of the first part, and the FPC8 connector is arranged on the second part of the FPC8. A slot 703 for inserting the FPC8 connector is provided on the mounting portion 702.

[0052] As a preferred embodiment, the connection portion 701 and the mounting portion 702 are connected by a thinning structure, and the mounting portion 702 is disconnected from the connection portion 701 when the mounting position B is reached. By providing the thinning structure, the connection portion 701 and the mounting portion 702 are connected when in the initial position A and are disconnected when in the mounting position B, thereby facilitating the installation of the mounting portion 702 on the lower housing. Figure 4 and Figure 5 As shown in the figure, the thinned portion includes a plurality of thinned connecting ribs 705 arranged at intervals. The thickness of the connecting ribs 705 is smaller than the thickness of the mounting portion 702 and the connecting portion 701, and is easy to process and form. In addition, since the connecting ribs 705 are thinned, it is convenient to disconnect the mounting portion 702 from the connecting portion 701.

[0053] like Figure 4 As shown in the figure, the connection part 701 in this embodiment is provided with two positioning posts 706 arranged opposite to each other, and the busbar support 6 is provided with positioning holes arranged one-to-one corresponding to each positioning post 706. The connection part 701 is positioned on the busbar support 6 by inserting the positioning posts 706 into the corresponding positioning holes, and is connected to the busbar support 6 by welding.

[0054] In this embodiment, in order to facilitate the installation of the mounting portion 702 on the lower housing, a clamping portion is provided on the mounting portion 702, and the mounting portion 702 is clamped on the lower housing through the clamping portion. Figure 4 As shown in , the clamping part includes a clamping head 704 provided on the mounting part 702, and a clamping hole corresponding to the clamping head 704 is provided on the lower shell. The mounting part 702 in the mounting position B is clamped into the corresponding clamping hole through the clamping head 704, so that the mounting part 702 can be fixed on the lower shell, which is not only convenient for installation and easy to implement, but also has good connection strength. In addition, the installation of the bus 601 on the bus bracket 6 not mentioned in this embodiment, and the installation of the FPC 8 and its bracket, etc. can all refer to the existing technology, and will not be repeated here.

[0055] The battery pack in this embodiment, by providing a bag body 2 equipped with colloid to fill the gap between the battery cell unit 100 and the installation cavity on the lower shell, is beneficial to improving the consistency of the expansion space of each part of the battery cell unit 100, and by optimizing the connector bracket 7 so that the installation part 702 has an initial position A and an installation position B, it is beneficial to the installation convenience of the battery cell unit 100 and the FPC8 connector, thereby improving the performance of the battery pack.

[0056] In addition, the present embodiment also relates to an electrical device, in which the battery pack as described above is provided.

[0057] The electrical device of this embodiment is provided with the battery pack as described above, which is beneficial to improving the electrical performance of the electrical device and has better safety.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It includes a lower shell with a plurality of installation cavities, and a plurality of battery cell units respectively arranged in each of the installation cavities, wherein the battery cell unit includes a plurality of battery cells arranged side by side, and in the thickness direction of the battery cells, a gap is formed between at least one end of each of the battery cell units and the inner wall of the installation cavity, and at least one end of the battery cell unit is provided with a bag body, and a colloid can be loaded into the bag body to fill the corresponding gap.

2. The battery pack according to claim 1, characterized in that: The top of the bag body is provided with a glue injection port for injecting the colloid, and a monitoring port for inserting an external liquid level detection part; After the colloid reaches the target liquid level, the colloid injection port and the monitoring port are closed.

3. The battery pack according to claim 2, characterized in that: The injection port and the monitoring port are arranged at two ends of the top of the bag body opposite to each other; and / or, The top of the bag body is provided with a plurality of glue injection ports.

4. The battery pack according to claim 1, characterized in that: The colloid is a foaming glue or a structural glue; and / or, The gaps are arranged between both ends of the battery cell unit and the installation cavity, and the bag bodies are arranged at both ends of the battery cell unit.

5. The battery pack according to claim 4, characterized in that: Both ends of the battery cell unit are respectively provided with heat preservation sheets and insulating sheets located outside the heat preservation sheets, and the bag body is arranged between the heat preservation sheets and the insulating sheets.

6. The battery pack according to any one of claims 1 to 5, characterized in that: Also included are a busbar bracket, an FPC, and a connector bracket for mounting a connector; The connector bracket has a connecting portion connected to one end of the bus bracket, and a mounting portion for mounting the FPC connector, and the mounting portion can be flipped relative to the connecting portion so that the mounting portion has an initial position coplanar with the connecting portion, and is flipped to a mounting position at the end of the battery cell unit.

7. The battery pack according to claim 6, characterized in that: The connecting portion and the mounting portion are connected via a thinning structure; When in the installation position, the installation portion is disconnected from the connecting portion.

8. The battery pack according to claim 7, characterized in that: The thinning structure includes a plurality of thinning connecting ribs arranged at intervals.

9. The battery pack according to claim 6, characterized in that: The mounting portion is provided with a clamping portion, and the mounting portion is clamped on the lower shell through the clamping portion.

10. An electrical device, characterized in that: The electrical device is provided with a battery pack according to any one of claims 1 to 9.

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