Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. The battery pack comprises partition plates arranged in a battery pack shell, the partition plates divide the interior of the battery pack shell into a plurality of containing cavities arranged in rows and columns, and first flow channels connected with a cooling liquid circulation pipeline are formed in the partition plates; the plurality of pole groups are respectively arranged in the accommodating cavities; and the busbars are arranged at the tops of the pole groups, and the multiple busbars are configured to be connected between the pole groups so as to connect the pole groups in series and / or in parallel. According to the battery pack disclosed by the utility model, through the arrangement of the partition plate and the first flow channel in the partition plate, the cooling liquid circulation pipeline can supply cooling liquid to the interior of the partition plate, so that the partition plate cools each pole group, the cooling effect on the pole groups is improved, and the use quality of the battery pack is improved.

Description

Technical Field

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

[0002] With the country's planning and support for the development of the new energy vehicle industry, the market share of new energy vehicles has continued to increase, and pure electric or hybrid vehicles have become more and more popular in people's lives. Among them, the safety of vehicle battery packs has become one of the important performance indicators of battery vehicles. There are multiple battery modules in the battery pack, and the battery module contains multiple battery cells. The battery cells can generate electricity through electrochemical reactions and transmit it outside the battery module to provide electricity to the electric vehicle and drive the electric vehicle.

[0003] Usually, a battery cell includes a battery cell shell and a pole group arranged in the battery cell shell. However, fixing the entire battery cell including the pole group and the battery cell shell in the battery pack shell not only increases the overall weight of the battery pack, but also requires a large number of battery cell shells and connecting parts for fixing the battery cell shells, thereby reducing the production cost of the battery pack and increasing the production cost of the battery pack. Therefore, in the prior art, a method of integrating the battery cell shell with the battery pack shell is adopted, that is, a partition is arranged in the battery pack shell, the inside of the battery pack shell is divided into multiple chambers, and each pole group is arranged in the chamber, which eliminates the use of the battery cell shell and its connecting parts, reduces the production cost and improves the production efficiency, and makes the battery pack more compact.

[0004] Since the battery pack is more compact and each pole group generates a large amount of heat, the heat generated by the pole group can be easily transferred to the entire battery pack through the partition plate. The existing cooling method using a liquid cooling plate has a poor cooling effect on each pole group and is difficult to meet the cooling needs of each pole group, which is not conducive to improving the quality of the battery pack. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery pack to improve the cooling effect of the electrode group, thereby improving the use quality of the battery pack.

[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 partition plate disposed in a battery pack shell, the partition plate divides the interior of the battery pack shell into a plurality of accommodating cavities arranged in rows and columns, and a first flow channel connected to a coolant circulation pipeline is formed in the partition plate; a plurality of pole groups are respectively disposed in each of the accommodating cavities; a bus bar is disposed on the top of each of the pole groups, the bus bar is configured to be connected between the pole groups in plurality, so as to connect the pole groups in series and / or in parallel.

[0008] Furthermore, a flexible circuit board connected to each of the bus bars is provided in the battery pack shell, a communication interface is provided on the flexible circuit board, and the communication interface penetrates and extends to the outside of the battery pack shell.

[0009] Furthermore, each of the busbars and the flexible circuit board is connected via a bracket, the bracket is provided with a plurality of openings for embedding each of the busbars, and the flexible circuit board is arranged on the top of the bracket.

[0010] Furthermore, a diaphragm is provided on one side of the bracket facing each of the electrode groups.

[0011] Furthermore, the battery pack shell includes a lower shell with an open top, and an upper shell snapped onto the lower shell; the upper shell is provided with a positive electrode column and a negative electrode column, and the positive electrode column and the negative electrode column are respectively connected to the positive electrode and the negative electrode of the two electrode groups that are farthest apart in connection relationship.

[0012] Furthermore, a side surface of the upper shell facing the lower shell is covered with a buffer structure.

[0013] Furthermore, the buffer structure is foam.

[0014] Furthermore, a second flow channel is integrated in the bottom wall and / or side wall of the lower shell, and the second flow channel is communicated with the first flow channel.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The battery pack described in the utility model, through the arrangement of the partition plate and the first flow channel in the partition plate, the coolant circulation pipeline can supply coolant to the interior of the partition plate, so that the partition plate cools each electrode group, improves the cooling effect on the electrode group, and thus helps to improve the use quality of the battery pack.

[0017] A flexible circuit board and a communication interface that runs through the battery pack shell are provided in the battery pack shell. Through the setting of the flexible circuit board and the communication interface, the working status of each electrode group in the battery pack can be detected to ensure the normal operation of the battery pack.

[0018] A bracket is provided inside the battery pack shell, and the bracket is used to form each bus bar and the flexible circuit board into a whole. The bracket can improve the stability of the connection between the flexible circuit board and each bus bar, and prevent the flexible circuit board from being disconnected from each bus bar due to external force, so as to ensure the normal operation of the battery pack. At the same time, the opening on the bracket can embed the bus bar in the bracket to reduce the thickness of the bracket, reduce the occupation of the bracket, bus bar and flexible circuit board in the internal space of the battery pack shell, and improve the compactness of the battery pack.

[0019] A diaphragm is provided between the top of each electrode group and the bracket, and the diaphragm can confine the free electrolyte in the accommodating cavity in the accommodating cavity to prevent the free electrolyte from overflowing and corroding and damaging the flexible circuit board or other electrical components, thereby affecting the operation of the battery pack, thereby improving the safety of the battery pack.

[0020] The battery pack shell includes a lower shell with an open top and an upper shell, so that each pole assembly can be arranged in the battery pack shell, and the arrangement of the flanged flexible circuit board and the bracket is conducive to the assembly of the battery pack and the maintenance and repair work inside the battery pack.

[0021] A side of the upper shell facing the lower shell is covered with a buffer structure. Through the setting of the buffer structure, when the battery pack is subjected to external force, the buffer structure can buffer part of the external force to prevent the bus, the flexible circuit board and the bracket from being damaged due to the external force, or prevent the bus and the flexible circuit board from being disconnected due to the external force, thereby improving the stability of the connection between the bus and the flexible circuit board, thereby protecting the bus, the flexible circuit board and the bracket.

[0022] The buffer structure is foam, which has a fluffy and porous structure, can effectively absorb external force to improve the protection effect, and the foam can apply uniform pressure to the bus, flexible circuit board and bracket, thereby improving the fixing effect of the above three.

[0023] By setting the second flow channel in the lower shell, the lower shell and the partition plate can cool multiple surfaces of each electrode group, thereby improving the cooling and heat dissipation effect of each electrode group, and further improving the use quality of the battery pack.

[0024] Another object of the present invention is to provide an electrical device, wherein the electrical device is provided with the battery pack as described above.

[0025] The electrical equipment and / or battery pack described in the utility model have the same technical effects as those of the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 This is a schematic diagram of the overall structure of the battery pack according to the first embodiment of the present utility model;

[0028] Figure 2 An exploded view of the battery pack according to the first embodiment of the present utility model;

[0029] Figure 3This is a schematic diagram of the assembly of the electrode group, bus bar, flexible circuit board and bracket according to the first embodiment of the present utility model;

[0030] Description of reference numerals:

[0031] 1. Separator; 2. Pole group; 3. Busbar;

[0032] 4. Flexible circuit board; 401. Communication interface;

[0033] 5. bracket; 501. overlap;

[0034] 6. Lower housing; 601. Coolant connector;

[0035] 7. Upper shell; 701. Positive pole; 702. Negative pole; 703. Foam. DETAILED DESCRIPTION

[0036] 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.

[0037] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0038] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, 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" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 an indirect connection 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 the present invention can be understood in combination with specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] Embodiment 1

[0042] The present embodiment relates to a battery pack. In terms of overall structure, the battery pack of the present embodiment includes a partition plate 1 disposed in a battery pack housing, a plurality of electrode groups 2 and a bus bar 3 for connecting the electrode groups 2 .

[0043] The partition plate 1 divides the interior of the battery pack shell into a plurality of accommodating cavities arranged in rows and columns, and a first flow channel connected to a coolant circulation pipeline is formed in the partition plate 1, and each electrode group 2 is respectively arranged in each accommodating cavity.

[0044] The busbars 3 are configured to be connected between the pole groups 2 in plurality, so as to connect the pole groups 2 in series or in parallel, or to connect the pole groups 2 in series and in parallel.

[0045] As shown in the above structure, through the setting of the partition plate 1 and the first flow channel in the partition plate 1, the coolant circulation pipeline can supply coolant to the inside of the partition plate 1, so that the partition plate 1 cools each electrode group 2, improves the cooling effect on the electrode group 2, and is beneficial to improving the use quality of the battery pack.

[0046] Based on the above overall introduction, specifically, the accommodating cavity of this embodiment is divided into two columns in the length direction of the battery pack to increase the loading capacity of the electrode group 2. In this embodiment, each electrode group 2 is connected in series through each bus 3, and the bus 3 is connected between the positive and negative electrode tabs of two adjacent electrode groups 2. Of course, in the specific implementation, the bus 3 of this embodiment can also connect the electrode groups 2 in parallel or in series and parallel according to actual needs.

[0047] In order to detect the working state of each electrode group 2 in the battery pack, a flexible circuit board 4 connected to each bus bar 3 is provided in the battery pack housing of this embodiment, and a communication interface 401 is provided on the flexible circuit board 4, and the communication interface 401 penetrates and extends to the outside of the battery pack housing. Specifically, the communication interface 401 is electrically connected to the battery management system outside the battery pack housing, and the flexible circuit board 4 is integrated with a collection circuit, which can sample the working current, voltage and other parameters of each electrode group 2, and output the electrical signal to the battery management system, so that the battery management system can judge the working state of each electrode group 2 according to the above electrical signal to identify whether the battery pack is working normally. Therefore, through the setting of the flexible circuit board 4 and the communication interface 401, the working state of each electrode group 2 in the battery pack can be detected to ensure the normal operation of the battery pack. In the specific implementation, since two columns of electrode groups 2 are set in the length direction of the battery pack in this embodiment, and the bus bars 3 connecting each electrode group 2 are set at both ends of the electrode group 2, in order to facilitate the connection of the flexible circuit board 4, two flexible circuit boards 4 are set to be connected to the two columns of electrode groups 2 respectively. In addition, the flexible circuit board 4 of this embodiment may also be integrated with a temperature sensor and its sensing circuit, and used to detect the working temperature of the busbar 3 and each electrode group 2. Of course, the flexible circuit board 4 may also be based on other sensors that can be used to detect the working state of each electrode group 2.

[0048] During the operation of the battery pack with the electric equipment, the battery pack may be subjected to external forces such as vibration and impact under harsh working conditions, which may cause the flexible circuit board 4 to shake easily in the battery pack shell, so that the flexible circuit board 4 is easily disconnected from the bus 3, which makes it difficult for the battery pack to work normally. Therefore, each bus 3 and the flexible circuit board 4 of this embodiment are connected by a bracket 5, and the bracket 5 is provided with a plurality of openings for embedding each bus 3, and the flexible circuit board 4 is arranged on the top of the bracket 5. Through the setting of the bracket 5, each bus 3 and the flexible circuit board 4 are formed into a whole. When the battery pack is in a harsh working condition, the bracket 5 can improve the stability of the connection between the flexible circuit board 4 and each bus 3, avoid the disconnection of the flexible circuit board 4 and each bus 3, so as to ensure the normal operation of the battery pack. At the same time, the setting of the opening can embed the bus 3 in the bracket 5, so as to reduce the thickness of the bracket 5, reduce the occupation of the bracket 5, the bus 3 and the flexible circuit board 4 in the internal space of the battery pack shell, and improve the compactness of the battery pack.

[0049] In a specific implementation, the bus 3 of this embodiment can be directly embedded in the opening, or a lap joint 501 can be provided at the opening, and the middle part of the bus 3 can be overlapped on the lap joint 501, and the other two ends of the bus 3 are connected to two adjacent pole groups 2, so that the bracket 5 is constrained by the bus 3 at the top of each pole group 2 to prevent the flexible circuit board 4 from being displaced and disconnected from the bus 3 due to vibration or impact.

[0050] It is understandable that since the electrode groups 2 are arranged in each accommodating cavity, after the battery pack has been working for a long time, some electrode groups 2 are prone to discharge a certain amount of free electrolyte into the accommodating cavity. The free electrolyte adheres to the flexible circuit board 4, which will corrode the flexible circuit board 4, causing the flexible circuit board 4 to fail to work normally. In order to prevent the free electrolyte from corroding the flexible circuit board 4, a diaphragm is provided on one side of the bracket 5 of this embodiment facing each electrode group 2. Through the setting of the diaphragm, the free electrolyte in the accommodating cavity can be constrained in the accommodating cavity, preventing the free electrolyte from overflowing and corroding and damaging the flexible circuit board 4 or other electrical components, thereby affecting the operation of the battery pack, thereby improving the safety of the battery pack. In specific implementation, the diaphragm of this embodiment adopts a polyvinyl chloride diaphragm, which has good corrosion resistance and can protect the flexible circuit board 4 and other electrical components.

[0051] In order to facilitate the assembly of the battery pack of this embodiment, in this embodiment, the battery pack housing includes a lower housing 6 with an open top, and an upper housing 7 buckled on the lower housing 6. The upper housing 7 is provided with a positive electrode column 701 and a negative electrode column 702, which are respectively connected to the positive electrode and the negative electrode of the two electrode groups 2 with the farthest connection relationship, so as to facilitate the installation of each electrode group 2 in the battery pack housing, and the arrangement of the flanging flexible circuit board 4 and the bracket 5, which is conducive to the assembly of the battery pack and the maintenance and repair work inside the battery pack.

[0052] In order to protect the bus 3, the flexible circuit board 4 and the bracket 5, the upper shell 7 of this embodiment is covered with a buffer structure on one side facing the lower shell 6. Through the setting of the buffer structure, when the battery pack is subjected to external force, the buffer structure can buffer part of the external force, prevent the bus 3, the flexible circuit board 4 and the bracket 5 from being damaged by the external force, or prevent the bus 3 and the flexible circuit board 4 from being disconnected due to the external force, improve the stability of the connection between the bus 3 and the flexible circuit board 4, and thus protect the bus 3, the flexible circuit board 4 and the bracket 5. In addition, the setting of the buffer structure can press the bracket 5 tightly against the top of each pole group 2, thereby achieving stable fixation of the bus 3, the flexible circuit board 4 and the bracket 5.

[0053] In order to improve the protection effect of the bus 3, the flexible circuit board 4 and the bracket 5, and to improve the fixing effect of the bus 3, the flexible circuit board 4 and the bracket 5, the buffer structure of this embodiment is foam 703. The foam 703 has a fluffy and porous structure, which can effectively absorb external force and improve the protection effect. The foam 703 can apply uniform pressure to the bus 3, the flexible circuit board 4 and the bracket 5, thereby further improving the fixing effect of the bus 3, the flexible circuit board 4 and the bracket 5.

[0054] In order to further improve the cooling effect on each pole group 2, the second flow channel is integrated in the bottom wall, the side wall or one of the two of the lower shell 6 of this embodiment, and the second flow channel is connected to the first flow channel. Through the provision of the second flow channel, the lower shell 6 and the partition plate 1 can cool multiple surfaces of each pole group 2, thereby improving the cooling and heat dissipation effect of each pole group 2, and further improving the use quality of the battery pack. In specific implementation, a coolant connector 601 for connecting to a coolant circulation pipeline is provided on the lower shell 6, and the coolant connector 601 is connected to the second flow channel in the lower shell 6.

[0055] In summary, in the battery pack of this embodiment, through the setting of the partition plate 1 and the first flow channel in the partition plate 1, the coolant circulation pipeline can supply coolant to the inside of the partition plate 1, so that the partition plate 1 cools each electrode group 2, thereby improving the cooling effect on the electrode group 2, thereby facilitating improving the use quality of the battery pack and having better usability.

[0056] Embodiment 2

[0057] The present embodiment relates to an electrical device, on which the battery pack of the first embodiment is provided. In a specific implementation, the lower shell 6 of the battery pack may be integrated on a structural member of the electrical device.

[0058] The electric device of this embodiment, in addition to having the technical effects possessed by the above-mentioned battery pack, reduces the overall weight of the electric device and improves the compactness of the electric device through the provision of the above-mentioned battery pack.

[0059] 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: include: A partition plate is disposed in the battery pack housing, the partition plate divides the interior of the battery pack housing into a plurality of accommodating chambers arranged in rows and columns, and a first flow channel connected to a coolant circulation pipeline is formed in the partition plate; A plurality of pole groups are respectively arranged in each of the accommodating cavities; A busbar is disposed on the top of each of the pole groups, and the busbar is configured to be connected between the pole groups in plurality to connect the pole groups in series and / or in parallel.

2. The battery pack according to claim 1, characterized in that: A flexible circuit board connected to each of the bus bars is disposed in the battery pack shell, a communication interface is disposed on the flexible circuit board, and the communication interface penetrates and extends to the outside of the battery pack shell.

3. The battery pack according to claim 2, characterized in that: Each of the busbars and the flexible circuit board is connected via a bracket, the bracket is provided with a plurality of openings for embedding each of the busbars, and the flexible circuit board is arranged on the top of the bracket.

4. The battery pack according to claim 3, characterized in that: A diaphragm is covered on one side of the bracket facing each of the electrode groups.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack housing comprises a lower housing with an open top, and an upper housing buckled on the lower housing; The upper shell is provided with a positive pole column and a negative pole column, and the positive pole column and the negative pole column are respectively connected to the positive pole and the negative pole of the two pole groups that are farthest from each other in connection relationship.

6. The battery pack according to claim 5, characterized in that: A side surface of the upper shell facing the lower shell is covered with a buffer structure.

7. The battery pack according to claim 6, characterized in that: The buffer structure is foam.

8. The battery pack according to claim 5, characterized in that: A second flow channel is integrated in the bottom wall and / or the side wall of the lower shell, and the second flow channel is communicated with the first flow channel.

9. An electrical equipment, characterized in that: The electrical equipment is provided with a battery pack according to any one of claims 1 to 8.

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