End plate for battery cell group and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to an end plate for a battery cell group and a battery pack, the end plate is arranged at the edge of the battery cell group, and the end plate comprises a body and a heat dissipation part; wherein the heat dissipation part comprises a first surface and a second surface, the first surface faces the battery cell group, and the second surface faces the electric connecting piece. Therefore, the heat dissipation problem of the electric connecting piece of the battery cell group can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides an end plate for a battery cell group and a battery pack. Background Art

[0002] At present, with the rapid development of the new energy industry, new energy devices such as electric vehicles and electric aircraft have been widely used, and the battery pack, as the core part of the new energy device, has also been widely concerned. Currently, the mainstream battery packs generally contain a battery cell group formed by square shell battery cells, cylindrical battery cells or soft-pack battery cells. Since power batteries are extremely sensitive to temperature changes, the temperature environment inside the battery pack has a great impact on the reliability, life and performance of the battery cells, and battery thermal management has become an important guarantee for the operation of new energy vehicles.

[0003] To achieve thermal management of the battery pack, end plates such as a main water pipe and a cooling plate are usually arranged inside the battery pack for thermal management. Electrical connectors are arranged inside the battery cell group to achieve electrical connection between the battery cells. When current passes through the electrical connectors, it will cause the electrical connectors to heat up. Especially during high-power charging and discharging, because the current is large and the generated heat is high, how to effectively dissipate the heat of the electrical connectors has become an urgent problem to be solved. Summary of the Utility Model

[0004] The utility model aims to solve the problem of heat dissipation of the electrical connectors of the battery cell group.

[0005] In a first aspect, the utility model provides an end plate for a battery cell group. The end plate is arranged at the edge of the battery cell group, and the end plate includes a body and a heat dissipation part; wherein, the heat dissipation part includes a first surface and a second surface, the first surface faces the battery cell group, and the second surface faces the electrical connectors.

[0006] Optionally, the battery cell group includes battery cells and a thermal management plate, and the thermal management plate is arranged between two rows of the battery cells.

[0007] Optionally, the first surface faces the thermal management plate.

[0008] Optionally, the first surface faces the battery cells.

[0009] Optionally, the heat dissipation part includes a first heat dissipation part and a second heat dissipation part; a first side surface of the first heat dissipation part faces the thermal management plate, and a second side surface of the second heat dissipation part faces the electrical connectors; a first surface of the second heat dissipation part faces the battery cells, and a second surface of the second heat dissipation part faces the electrical connectors.

[0010] Optionally, the heat dissipation part includes a cavity and a thermal conductive adhesive filling the cavity.

[0011] Optionally, the battery cell is a cylindrical battery cell, the side surface of the end plate faces the battery cell, and the side surface of the end plate matches the side surface shape of the cylindrical battery cell.

[0012] Optionally, the electrical connector includes an output pole.

[0013] In a second aspect, the present invention further provides a battery pack, which includes a box body, a battery cell group, and an end plate for the battery cell group according to any one of the above, and the battery cell group and the end plate for the battery cell group are arranged in the box body.

[0014] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solutions, the end plate of the battery cell group and the battery pack of the present invention can achieve considerable technical progressiveness and practicability, and have wide utilization value in the industry. It has at least the following advantages:

[0015] In the case of adopting the above technical solutions, the present invention provides a heat dissipation part on the end plate for dissipating heat from the electrical connector. One surface of the heat dissipation part faces the battery cell group, and the other surface faces the electrical connector. The heat generated by the electrical connector can be conducted to the battery cell group through the heat dissipation part, realizing heat dissipation of the electrical connector. Especially for the scenario of high-power charging and discharging, the heat dissipation effect is particularly obvious.

[0016] Furthermore, the electrical connector mentioned in the present application is an output pole. When the battery pack is charging and discharging, especially during high-power charging and discharging, the output pole is the area with high temperature in the battery pack. The battery cells facing the output pole are easily affected by high temperature, resulting in uneven temperature field distribution of the entire battery cell pack. Effectively dissipating heat from the output pole can also effectively uniform the temperature inside the battery pack and maintain the consistency of the battery cells inside the battery pack. Description of the Drawings

[0017] The following describes the preferred embodiments of the present invention with reference to the drawings. In the drawings:

[0018] Figure 1 is a schematic structural diagram of a battery cell group and an end plate provided by the present invention;

[0019] Figure 2 is a front view of a partial structure of a battery cell group and an end plate provided by the present invention;

[0020] Figure 3 is an exploded view of a partial structure of a battery cell group and an end plate provided by the present invention;

[0021] Figure 4 is a top view of a partial structure of a battery cell group and an end plate provided by the present invention.

[0022] List of Reference Numerals:

[0023] 10. End plate; 101. Body of the end plate; 102. Heat dissipation part of the end plate; 1021. First heat dissipation part; 1022. Second heat dissipation part; A. First side of the heat dissipation part; B. Second side of the heat dissipation part; 103. Mounting part of the end plate; 20. Battery cell group; 201. Battery cell; 202. Thermal management plate; 30. Electrical connection part; 40. Side plate. Detailed implementation mode

[0024] As described in the background art, there is a problem that the electrical connection part in the existing battery pack cannot be effectively cooled. To solve this problem, the present application provides an end plate for a battery cell group, the end plate is arranged at the edge of the battery cell group, and the end plate includes a body and a heat dissipation part; wherein, the heat dissipation part includes a first side and a second side, the first side faces the battery cell group, and the second side faces the electrical connection part.

[0025] Thus, the electrical connection part can be in contact with the end plate, and a part of the area of the end plate is used as the heat dissipation part of the electrical connection part to achieve heat dissipation of the electrical connection part.

[0026] The preferred implementation modes of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation modes are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0027] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "inner", "outer", "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be further noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "arranged", "connected", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] In one embodiment, the battery cells mentioned in the present application may include at least one of square shell battery cells, cylindrical battery cells or soft package battery cells. In the present application, cylindrical battery cells are taken as an example for illustration.

[0030] Please refer to Figures 1 to 4 , Figure 1 which is a schematic structural diagram of a battery cell group and an end plate provided by the present utility model; Figure 2The front view of a partial structure of a battery cell group and an end plate provided by the present utility model; Figure 3 The exploded view of a partial structure of a battery cell group and an end plate provided by the present utility model; Figure 4 The top view of a partial structure of a battery cell group and an end plate provided by the present utility model.

[0031] In the first aspect, the present utility model provides an end plate 10 for a battery cell group. The end plate 10 is disposed at the edge of the battery cell group 20, as shown in Figure 1 , the battery cell group 20 includes a plurality of cylindrical battery cells 201. An end plate 10 is disposed at one end of the battery cell group 20. The edge of the battery cell group 20 and the end plate 10 are as shown in the M area in Figure 1 .

[0032] Optionally, the battery cell group 20 includes four sides. End plates 20 are disposed on two opposite sides, and side plates 40 are disposed on the other two sides.

[0033] Wherein, at least one end plate 10 includes a body 101 and a heat dissipation part 102. Wherein, the heat dissipation part 102 includes a first surface A and a second surface B. The first surface A of the heat dissipation part 102 faces the battery cell group 20, and the second surface B of the heat dissipation part 102 faces the electrical connector 30.

[0034] Optionally, the end plate 10 may include one or more heat dissipation parts 102.

[0035] Optionally, the first surface A of the heat dissipation part 102 may be close to the battery cell group 20 or may be connected to the battery cell group 20. In a specific embodiment, the first surface A of the heat dissipation part 102 is connected to the battery cell group 20 through a heat conduction structure such as thermal conductive glue.

[0036] Optionally, the second surface B of the heat dissipation part 102 may be close to the electrical connector 30 or may be connected to the electrical connector 30. In a specific embodiment, the second surface B of the heat dissipation part 102 is connected to the electrical connector 30 through a heat conduction structure such as thermal conductive glue.

[0037] Optionally, the heat dissipation part 102 may be integrally formed with the body 101, or the heat dissipation part 102 may be connected to the body 101 through an adhesive such as glue.

[0038] In this embodiment, a heat dissipation part 102 is disposed on the end plate. One surface (i.e., the first surface A) of the heat dissipation part 102 faces the battery cell group 20, and the other surface (i.e., the second surface B) faces the electrical connector 30. The heat generated by the electrical connector 30 can be conducted to the battery cell group 20 through the heat dissipation part 102, realizing effective heat dissipation of the electrical connector 30. Especially for the scenario of high-power charging and discharging, the heat dissipation effect is particularly obvious.

[0039] Optionally, a heat transfer member (not shown in the figure) is provided between the second surface B of the heat dissipation part 102 and the electrical connection member 30. Specifically, the heat transfer member can be any component or material for achieving heat conduction. For example, the heat transfer member can be thermal conductive adhesive, thermal conductive silica gel pad, etc.

[0040] In a specific embodiment of the electrical connection member 30 (not shown in the figure of this embodiment), the electrical connection member 30 can be a busbar (also known as a bus bar, bar sheet). The electrical connection member 30 is disposed above the battery cell 201. The second surface B of the heat dissipation part 102 (i.e., the upper surface of the heat dissipation part) is in contact with the busbar, so that the heat of the busbar can be transferred to the heat dissipation part 102 and then transferred to the battery cell group 20 through the heat dissipation part 102, realizing the cooling of the busbar.

[0041] In this embodiment, each end plate 10 can include one or more heat dissipation parts 102. When including a plurality of heat dissipation parts 102, these heat dissipation parts 102 can be dispersedly disposed on the end plate 10 to realize the heat dissipation of the busbar.

[0042] In another specific embodiment of the electrical connection member 30 (as shown in the drawings of the present application), the electrical connection member 30 can be the output pole 30 of the battery cell group 20. The output pole 30 is used to export the electric energy of the battery cell group 20 and is generally disposed at the edge of the battery cell group 20. Thus, according to the position of the output pole 30, one or more heat dissipation parts 102 and the shape and size of the heat dissipation parts 102 can be set on the end plate 10 to realize the heat dissipation of the output pole 30.

[0043] Figures 2 to 4 The case where the electrical connection member 30 is the output pole is shown, and the position of the output pole is shown. When the battery pack is charged and discharged, especially during high-power charging and discharging, the output pole 30 is the area with high temperature in the battery pack. The battery cells facing the output pole end (such as 8 in the figure) are easily affected by high temperature, resulting in uneven temperature field distribution of the whole pack of battery cells. Effectively dissipating heat from the output pole 30 can also effectively even out the temperature in the battery pack and maintain the consistency of the battery cells in the battery pack.

[0044] In one embodiment, the battery cell group 20 includes battery cells 201 and a thermal management plate 202, and the thermal management plate 202 is disposed between two rows of the battery cells 201.

[0045] Among them, the thermal management plate 202 can be referred to as a cooling plate, cold plate, heat plate, liquid cooling plate, liquid cooling tube, etc. The thermal management plate 202 can be disposed between two rows of battery cells 201 (such as Figure 4A thermal management plate 202 is shown (other thermal management plates are not shown). A flow channel is provided inside the thermal management plate 202, and the flow channel is for the coolant to flow through. By heating or cooling the coolant, heating or cooling of the battery cell 201 can be achieved. The coolant can be a liquid such as ethylene glycol or water.

[0046] Optionally, a thermal management plate 202 can be provided between every two rows of battery cells 201. Alternatively, a thermal management plate 202 can also be provided every multiple rows (such as two rows) of battery cells 201.

[0047] When the battery cell 201 is a cylindrical battery cell, the side shape of the thermal management plate 202 matches the side shape of the cylindrical battery cell 20. Further, the side surface of the thermal management plate 202 is a curved side surface that fits the cylindrical battery cell 10.

[0048] Please refer to Figure 4 , in the first specific embodiment of the heat dissipation part 102, the end plate 10 includes two heat dissipation parts 102, which are respectively denoted as the first heat dissipation part 1021 and the second heat dissipation part 1022.

[0049] The first side surface A1 of the first heat dissipation part 1021 faces the thermal management plate 202, and the second side surface of the first heat dissipation part 1021 (i.e., the upper surface of the first heat dissipation part 1021, not shown in the figure) faces the electrical connector 30. Thus, a heat transfer path of electrical connector 30 - first heat dissipation part 1021 - thermal management plate 202 can be formed. The heat generated by the electrical connector 30 can be transferred to the thermal management plate 202 through the first heat dissipation part 1021. While the thermal management plate 202 cools the battery cell 201, it can also effectively dissipate the heat of the electrical connector 30.

[0050] The first surface A2 of the second heat dissipation part 1022 faces the battery cell 201, and the second surface of the second heat dissipation part 1022 (i.e., the upper surface of the second heat dissipation part 1022, not shown in the figure) faces the electrical connector 30. The heat generated by the electrical connector 30 can be transferred to the battery cell 201 adjacent thereto through the second heat dissipation part 1022. Optionally, this battery cell 201 is in contact with the thermal management plate 202. Thus, a heat transfer path of electrical connector 30 - second heat dissipation part 1022 - battery cell 201 - thermal management plate 202 can be formed. While the thermal management plate 202 cools this battery cell 201, it can also effectively dissipate the heat of the electrical connector 30.

[0051] Optionally, the heat dissipation area of the second heat dissipation part 1022 is smaller than that of the first heat dissipation part 1021, so that more heat can be directly dissipated from the first heat dissipation part 1021 through the heat management plate 202, and less heat flows from the second heat dissipation part 1022 to the battery cell 201. This is to avoid a large amount of heat flowing to the battery cell 201, resulting in the temperature of the battery cell 201 close to the second heat dissipation part 1022 being significantly higher than that of other battery cells, causing too large a temperature difference inside the battery pack.

[0052] In the second specific embodiment of the heat dissipation part 102, the first surface A of the heat dissipation part 102 faces the heat management plate 202. It should be noted that for the specific description of the heat dissipation part 102 in this embodiment, reference can be made to Figure 4 the relevant description of the first heat dissipation part 1021 therein, which will not be elaborated here.

[0053] In the third specific embodiment of the heat dissipation part 102, the first surface A of the heat dissipation part 102 faces the battery cell 201. It should be noted that for the specific description of the heat dissipation part 102 in this embodiment, reference can be made to Figure 4 the relevant description of the second heat dissipation part 1022 therein, which will not be elaborated here.

[0054] Optionally, when the battery cell 20 is a cylindrical battery cell, the side surface of the end plate 10 faces the battery cell 20, and the side surface of the end plate 10 is a three-dimensional arc shape to match the side shape of the cylindrical battery cell 20. Thus, the end plate can contact the cylindrical battery cell 20 to provide support and protection for the cylindrical battery cell group.

[0055] Optionally, the upper surface of the end plate 10 can be a flat surface, or as shown in the figure, multiple through holes are provided on the upper surface. Generally speaking, in order to reduce the weight of the end plate 10, it is set as a hollow structure, and multiple cavities are formed in the end plate 10 as a whole, so the upper surface of the end plate 10 can include multiple through holes.

[0056] In one embodiment, the heat dissipation part 102 includes a cavity and a heat-conducting adhesive filling the cavity.

[0057] In a specific embodiment, a cavity of the end plate 10 close to the heat management plate 202 can be used as the heat dissipation part 102, and it is filled with a heat-conducting adhesive, which connects the end plate 10 and the electrical connector 30, so that the heat of the electrical connector 30 is transferred to the heat management plate 20 through the heat-conducting adhesive. Further, this cavity filled with the heat-conducting adhesive should have a heat conduction relationship with the heat management plate 202, for example, one of the walls of this cavity is in contact with the heat management plate 202.

[0058] In another specific embodiment, a cavity of the end plate 10 close to the battery cell 201 can be used as a heat dissipation part 102, and a heat-conducting adhesive is filled therein. The heat-conducting adhesive connects the end plate 10 and the electrical connector 30, so that the heat of the electrical connector 30 is transferred to the battery cell 201 through the heat-conducting adhesive. Further, the cavity filled with the heat-conducting adhesive should have a heat conduction relationship with the battery cell 201. For example, one of the walls of the cavity is in contact with the battery cell 201.

[0059] In a second aspect, the present utility model further provides a battery pack, which includes a box body (not shown in the figure), a battery cell group 20 and an end plate 10, and the battery cell group 20 and the end plate 10 are arranged in the box body.

[0060] Optionally, the box body includes a box cover, a lower box body and a bottom plate. The lower box body includes a plurality of side walls connected end to end. The box cover and the bottom plate are respectively covered on two sides of the lower box body, so that a sealed battery cell cavity is formed in the box body. The above-mentioned end plate 10 and battery cell group 20 are arranged in the battery cell cavity.

[0061] In one embodiment, the top of the battery cell 201 faces the upper box cover, the bottom of the battery cell 201 faces the bottom plate, and the height direction of the battery cell 201 is also the height direction of the battery pack.

[0062] Optionally, the top of the battery cell 201 is bonded to the upper box cover, and the bottom of the battery cell 201 is bonded to the bottom plate. The main body 101 of the end plate 10 and the battery cell 201 are connected by an adhesive (such as a heat-conducting adhesive, a double-sided adhesive, etc.), which can improve the heat transfer efficiency. Using adhesive bonding as a connection method can minimize the application of connecting components to further improve the space utilization rate in the battery pack.

[0063] In a third aspect, the present utility model further provides a vehicle, and the vehicle of the present utility model includes any one of the above-described battery packs.

[0064] Those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0065] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. An end plate for a battery cell group, characterized in that, The end plate is disposed at the edge of the battery cell group, and the end plate includes a body and a heat dissipation part; wherein, the heat dissipation part includes a first surface and a second surface, the first surface faces the battery cell group, and the second surface faces the electrical connection part.

2. The end plate according to claim 1, characterized in that The battery cell group includes battery cells and a thermal management plate, and the thermal management plate is disposed between two rows of the battery cells.

3. The end plate according to claim 2, wherein The first surface faces the thermal management plate.

4. The end plate according to claim 2, wherein The first surface faces the battery cells.

5. The end plate according to claim 2, characterized in that, The heat dissipation part includes a first heat dissipation part and a second heat dissipation part; a first side surface of the first heat dissipation part faces the thermal management plate, and a second side surface of the second heat dissipation part faces the electrical connection part; a first surface of the second heat dissipation part faces the battery cells, and a second surface of the second heat dissipation part faces the electrical connection part.

6. The end plate according to any one of claims 1 to 5, characterized in that, A heat transfer member is provided between the second surface and the electrical connection part.

7. The end plate according to any one of claims 1 to 5, characterized in that The heat dissipation part includes a cavity and a thermal conductive adhesive filling the cavity.

8. The end plate according to any one of claims 1 to 5, characterized in that The battery cells are cylindrical battery cells, a side surface of the end plate faces the battery cells, and the side surface of the end plate matches the side surface shape of the cylindrical battery cells.

9. The end plate according to any one of claims 1 to 5, characterized in that, The electrical connection part includes an output pole.

10. A battery pack, characterized in that, The battery pack includes a box body, a battery cell group, and an end plate for the battery cell group according to any one of claims 1 to 9, and the battery cell group and the end plate for the battery cell group are disposed in the box body.

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