Quick charging core module and battery pack

Abstract

The utility model provides a quick charging core module and a battery pack. The utility model discloses a quick-charging cell module which comprises a cell unit, a busbar and a cold plate, a plurality of battery cell units are arranged along the thickness direction of the battery cell units; the busbar is arranged at the top of the battery cell unit array and is electrically connected with the battery cell units; the cold plates are symmetrically arranged on the two sides of the arrangement of the battery cell units and are attached to the side walls of the battery cell units; the busbar comprises a conduction part attached to the top of the battery cell unit and a heat dissipation part vertically arranged on the conduction part, and the heat dissipation part is attached to the cold plate. According to the utility model, the temperature of the battery core pole can be effectively controlled, the heat dissipation effect is better, and the requirement of the quick charging core on the heat dissipation performance is met.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a fast-charging battery cell module. The utility model also relates to a battery pack comprising the above-mentioned fast-charging battery cell module. Background Art

[0002] A battery pack is an energy storage device that realizes the functions of energy storage and energy release through the mutual conversion of chemical energy and electrical energy. During the charging and discharging process of the battery pack, the battery cells, which are the constituent units of the battery pack, will continuously undergo the energy conversion between chemical energy and electrical energy, and a large amount of heat will be generated. To prevent the battery cells from experiencing thermal runaway, a cooling device for heat dissipation is usually integrated in the battery pack.

[0003] Currently, a common cooling device for battery packs is a liquid cooling plate. The liquid cooling plate is generally arranged at the bottom or on both sides of the battery cell module, and can cool the bottom or both ends of the battery cell module. With the development of the fast-charging technology of battery packs, the charging and discharging current of the battery cells is getting larger and larger, which leads to an obvious resistance thermal effect phenomenon at the pole column part of the battery cells, and the heat accumulation is relatively serious. The too high temperature of the pole column will not only affect the service life and endurance performance of the battery cells, but also increase the aging speed of the plastic parts near the pole column in the battery pack. However, the conventional arrangement form of the liquid cooling plate can only achieve a certain temperature control function for the two sides or the bottom of the battery cells, and has a limited temperature control effect on the pole column located at the top of the battery cells, and cannot meet the heat dissipation performance requirements of the fast-charging battery cell module.

[0004] It can be known from the above background art that the heat dissipation effect of the liquid cooling plate cooling structure adopted by the existing battery pack is limited, and it is difficult to meet the heat dissipation performance requirements of the fast-charging battery cells. Summary of the Utility Model

[0005] In view of this, the utility model aims to provide a fast-charging battery cell module, which can effectively control the temperature of the pole column of the battery cell, has a good heat dissipation effect, and meets the heat dissipation performance requirements of the fast-charging battery cell.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A fast-charging battery cell module of the utility model comprises a plurality of battery cell units arranged along the thickness direction of itself;

[0008] A bus bar, arranged at the top of the arrangement of the battery cell units and electrically connected to the battery cell units;

[0009] A cold plate, symmetrically arranged on both sides of the arrangement of the battery cell units and attached to the side walls of the battery cell units;

[0010] The bus bar includes a conduction part that fits on the top of the battery cell unit and a heat dissipation part that is vertically arranged on the conduction part, and the heat dissipation part is in contact with the cold plate.

[0011] Further, the cold plate includes a plate body, and a flow channel cavity is formed on the plate body;

[0012] Liquid inlets and outlets are respectively formed at both ends of the plate body, and the cooling medium enters the flow channel cavity from the liquid inlet and is discharged from the liquid outlet of the flow channel cavity.

[0013] Further, the projection of the flow channel cavity on the plate body is in a "mouth" shape.

[0014] Further, a heat-conducting structural adhesive is applied on the contact surface between the plate body and the battery cell unit.

[0015] Further, a top cover is further included, and the top cover covers the top of the cold plate and cooperates with the cold plate to wrap the bus bar inside.

[0016] Further, the heat dissipation part extends horizontally to form a limiting part, and the limiting part is in contact with the top cover; a plurality of fastening bolts are vertically arranged on the top cover and the limiting part.

[0017] Further, end plates are respectively arranged at both ends of the arrangement of the battery cell units.

[0018] Further, a support frame is fixedly arranged on the top of the battery cell unit, and the support frame forms a limiting support for the bus bar.

[0019] Further, a total positive contact piece and a total negative contact piece are respectively arranged at both ends of the support frame, and the total positive contact piece and the total negative contact piece are electrically connected to the bus bar.

[0020] Compared with the prior art, the present utility model has the following advantages:

[0021] The fast-charging cell module and battery pack described in the present utility model can make better use of the internal space of the battery pack and enable the battery pack to have a higher energy density by arranging multiple cell units in the thickness direction. By symmetrically arranging the cold plates on both sides of the arrangement of the cell units, the cold plates can cool the cell units from both sides, maintaining the temperature on both sides of the cell units within a suitable range. By arranging a busbar at the top of the arrangement of the cell units, the conduction part in the busbar realizes the electrical connection between multiple cell units. The heat dissipation part in the busbar is connected to the conduction part and is in contact with the cold plate, and can serve as a channel for heat exchange between the pole column of the cell unit and the cold plate, enabling the cold plate to transfer the heat generated at the pole column part of the cell unit to the outside through the busbar, thereby achieving the invention purpose of effectively controlling the temperature of the cell pole column and meeting the heat dissipation performance requirements of the fast-charging cell.

[0022] In addition, by forming a flow channel cavity for the cooling medium to flow on the plate body, the cooling medium can exchange heat with the outside during the process of flowing along the flow channel cavity, thereby transferring the heat generated by the cell units to the outside. By respectively arranging the liquid inlet and the liquid outlet at both ends of the flow channel cavity, the cooling medium can fully flow through each part inside the flow channel cavity, improving the uniformity of the heat dissipation effect of the cold plate.

[0023] By setting the flow channel cavity with a projection shape of "mouth", the flow channel cavity has two relatively independent and interconnected flow channels up and down. The structural design of the two flow channels up and down can respectively dissipate heat from the side wall of the cell unit located below and the heat dissipation part of the busbar located above, thereby ensuring the uniformity of the heat dissipation effect of the cold plate.

[0024] By applying a thermally conductive structural adhesive on the contact surface between the plate body and the cell unit, on the one hand, the plate body and the side wall of the cell unit can be fixed by gluing, improving the structural stability of the cell unit; on the other hand, the situation of poor contact between the plate body and the side wall of the cell unit can be avoided, enhancing the overall heat dissipation effect of the cold plate on the side wall of the cell unit.

[0025] Secondly, by arranging a top cover on the top of the cold plate, the top cover can cooperate with the cold plate to enclose an internal space. The cell unit and the busbar are both installed in the internal space, and the top cover plays a protective role for the busbar and the cell unit, and can extend the service life of the cell unit and the busbar.

[0026] By arranging a limiting part on the busbar, on the one hand, it can be used to install fastening bolts, enabling the top cover to fix the position of the busbar through the fastening bolts; on the other hand, the structure where the limiting part is in contact with the top cover can transfer a part of the heat of the heat conduction part to the outside through the top cover, and can cooperate with the cold plate to achieve a better temperature control effect on the busbar and the pole column of the cell unit.

[0027] By arranging end plates at both the head and tail ends of the battery cell unit, it is possible to limit the battery cell unit, improve the structural stability of the battery cell unit within the battery pack, and also serve as the stress point for the hoisting and installation of the fast-charging battery cell module, making the installation process of the fast-charging battery cell module more convenient.

[0028] Furthermore, by arranging a support frame at the top of the arrangement of the battery cell units, it is possible to support and limit the bus bar, improving the stability of the bus bar within the battery pack. By arranging a total positive contact piece and a total negative contact piece at both ends of the support frame, it is possible to achieve current conduction between the bus bar and the outside world. As the positive and negative output poles of the overall fast-charging battery cell module, electrical energy is transmitted to the outside world.

[0029] In addition, the present utility model also proposes a battery pack provided with the above-mentioned fast-charging battery cell module.

[0030] The battery pack described in the present utility model has the same beneficial effects as the above-mentioned fast-charging battery cell module compared with the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0032] Figure 1 is a schematic structural diagram of the fast-charging battery cell module in an embodiment of the present utility model;

[0033] Figure 2 is an exploded structural diagram of the fast-charging battery cell module in an embodiment of the present utility model;

[0034] Figure 3 is a schematic structural diagram of the bus bar in an embodiment of the present utility model;

[0035] Figure 4 is a schematic structural diagram of the cold plate in an embodiment of the present utility model.

[0036] Description of the reference numerals:

[0037] 1. Battery cell unit;

[0038] 2. Bus bar;

[0039] 201. Conductive part; 202. Heat dissipation part; 203. Limiting part;

[0040] 3. Cold plate;

[0041] 301. Plate body; 302. Flow channel cavity; 303. Liquid inlet; 304. Liquid outlet;

[0042] 4. Top cover; 5. End plate;

[0043] 6. Support frame;

[0044] 601. Total positive contact piece; 602. Total negative contact piece. Detailed implementation manners

[0045] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will describe the specific implementation manners of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other implementation manners can also be obtained.

[0046] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings. It is 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, so it cannot be understood as a limitation to the present invention. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] Taking a fast-charging battery cell module and battery pack described in the present invention as an example, the orientation terms such as "upper, lower, left, right, front, rear" used in the embodiments are defined based on the up-down direction (also known as the height direction, or the Z direction of the battery pack), left-right direction (also known as the width direction, or the Y direction of the battery pack), and front-rear direction (also known as the length direction, or the X direction of the battery pack) of the battery pack. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, with the side closer to the middle of the battery pack being "inner", and vice versa being "outer".

[0048] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting piece" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific situations.

[0049] The following will refer to the attached Figure 1 to the attached Figure 4The present utility model will be described in detail in conjunction with the embodiments.

[0050] Embodiment 1

[0051] This embodiment relates to a fast - charging cell module. By adopting a structure in which the bus bar is attached to the cold plate, while the bus bar realizes the function of electrical connection between multiple cells, as a bridge for heat transfer between the cell pole and the cold plate, the heat generated by the cell pole is transferred to the cold plate through the bus bar, so that the cold plate can achieve a better control effect on the temperature of the cell pole and its surrounding area, meeting the requirements of the fast - charging cell for the heat dissipation capacity of the battery pack.

[0052] In terms of the overall structure, referring to Figure 1 、 Figure 2 and Figure 3 , the fast - charging cell module of this embodiment includes a cell unit 1, a bus bar 2, and a cold plate 3. Among them, the cell unit 1 can be a short - blade cuboid cell with a rectangular cross - section. The pole of the cell unit 1 is arranged at the top of the cell unit 1. The cell unit 1 is arranged in multiple rows along its thickness direction. The bus bar 2 is arranged at the top of the arrangement composed of the cell unit 1. The bus bar 2 can be a sheet metal part made of copper alloy or aluminum alloy. The cold plate 3 is symmetrically arranged on both sides of the arrangement composed of the cell unit 1. The bus bar 2 includes a conduction part 201 and a heat - dissipation part 202. Among them, the conduction part 201 abuts against the pole of the cell unit 1, realizing the electrical connection between two adjacent cell units 1. The heat - dissipation part 202 is vertically connected to the upper - surface edge of the conduction part 201. The heat - dissipation part 202 is attached to the cold plate 3.

[0053] With the above settings, by arranging multiple cell units 1 in rows along the thickness direction, the internal space of the battery pack can be better utilized, making the battery pack have a higher energy density. By symmetrically arranging the cold plate 3 on both sides of the arrangement of the cell unit 1, the cold plate 3 can cool the cell unit 1 from both sides, maintaining the temperature on both sides of the cell unit 1 within a suitable range. By arranging the bus bar 2 at the top of the arrangement of the cell unit 1, the conduction part 201 in the bus bar 2 realizes the electrical connection between multiple cell units 1. The heat - dissipation part 202 in the bus bar 2 is connected to the conduction part 201 and is attached to the cold plate 3, which can serve as a channel for heat exchange between the pole of the cell unit 1 and the cold plate 3, enabling the cold plate 3 to transfer the heat generated at the pole part of the cell unit 1 to the outside through the bus bar 2, thus achieving the invention purpose of effectively controlling the temperature of the cell pole and meeting the requirements of the fast - charging cell for the heat - dissipation performance.

[0054] Based on the above design concept, specifically, in this embodiment, referring to Figure 2 and Figure 4, the main body of the cold plate 3 is a plate body 301, and the plate body 301 can be a rectangular aluminum alloy stamping plate. A flow channel cavity 302 is formed on the plate body 301 by integral stamping. A liquid inlet 303 and a liquid outlet 304 are provided on the plate body 301. The liquid inlet 303 and the liquid outlet 304 are located at both ends of the flow channel cavity 302 and are both communicated with the inside of the flow channel cavity 302. The cooling medium for heat exchange enters the flow channel cavity 302 from the liquid inlet 303, flows along the flow channel cavity 302, and then flows out of the flow channel cavity 302 from the liquid outlet 304.

[0055] By forming the flow channel cavity 302 for the flow of the cooling medium on the plate body 301, the cooling medium can exchange heat with the outside during the process of flowing along the flow channel cavity 302, so as to transfer the heat generated by the battery cell unit 1 to the outside. By respectively arranging the liquid inlet 303 and the liquid outlet 304 at both ends of the flow channel cavity 302, the cooling medium can fully flow through each part inside the flow channel cavity 302, improving the uniformity of the heat dissipation effect of the cold plate 3.

[0056] Refer to Figure 2 and Figure 4 , in order to further improve the uniformity of the heat dissipation effect of the cold plate 3, the projection shape of the flow channel cavity 302 on the plate body 301 is a "mouth" shape. By setting the flow channel cavity 302 with a projection shape of "mouth", the flow channel cavity 302 has two relatively independent and interconnected flow channels up and down. The structural design of the two flow channels up and down can respectively dissipate heat from the side wall of the battery cell unit 1 located below and the heat dissipation part 202 of the bus bar 2 located above, thus ensuring the uniformity of the heat dissipation effect of the cold plate 3.

[0057] Refer to Figure 2 and Figure 4 , for the purpose of improving the heat dissipation effect of the cold plate 3, in this embodiment, a heat-conducting structural adhesive is applied to the contact surface between the plate body 301 of the cold plate 3 and the battery cell unit 1. By applying the heat-conducting structural adhesive to the contact surface between the plate body 301 and the battery cell unit 1, on the one hand, the plate body 301 and the side wall of the battery cell unit 1 can be fixed by gluing, improving the structural stability of the battery cell unit 1; on the other hand, the situation of poor contact between the plate body 301 and the side wall of the battery cell unit 1 can be avoided, and the overall heat dissipation effect of the cold plate 3 on the side wall of the battery cell unit 1 is improved.

[0058] Refer to Figure 2 , in order to improve the overall service life of the fast-charging battery module, in this embodiment, the fast-charging battery module further includes a top cover 4. The top cover 4 can be a rectangular metal plate. The top cover 4 is fixedly buckled on the top of the cold plate 3 by means of bolt connection. The top cover 4 and the cold plate 3 enclose an internal space, and the bus bar 2 and the battery cell unit 1 are covered within the internal space.

[0059] By providing a top cover 4 on the top of the cold plate 3, the top cover 4 can cooperate with the cold plate 3 to enclose an internal space. Both the battery cell unit 1 and the bus bar 2 are installed in the internal space, and the top cover 4 plays a protective role for the bus bar 2 and the battery cell unit 1, which can extend the service life of the battery cell unit 1 and the bus bar 2.

[0060] Refer to Figure 2 and Figure 3 In order to improve the structural stability of the bus bar 2, in this embodiment, a limiting portion 203 is formed by extending the side of the heat dissipation portion 202 away from the conduction portion 201 along the horizontal direction. The limiting portion 203 is attached to the lower surface of the top cover 4. A plurality of fastening bolts are passed through the top cover 4 and the limiting portion 203. The fastening bolts form a threaded connection structure with the top cover 4 and the limiting portion 203, thereby realizing the position fixation of the bus bar 2.

[0061] By providing the limiting portion 203 on the bus bar 2, on the one hand, it can be used to install the fastening bolts, so that the top cover 4 can fix the position of the bus bar 2 through the fastening bolts; on the other hand, the structure where the limiting portion 203 is attached to the top cover 4 can transfer a part of the heat of the heat conduction portion to the outside through the top cover 4, and can cooperate with the cold plate 3 to achieve a better temperature control effect on the bus bar 2 and the pole columns of the battery cell unit 1.

[0062] Refer to Figure 1 and Figure 2 In order to improve the structural stability of the battery cell unit 1, in this embodiment, end plates are provided at both the head and the tail of the arrangement formed by the battery cell units 1. The end plates are fixed to the entire fast-charging battery cell module by means of steel strip binding.

[0063] By providing end plates at both the head and the tail of the battery cell unit 1, it can not only limit the battery cell unit 1 and improve the structural stability of the battery cell unit 1 in the battery pack, but also serve as the stress points for lifting and installing the fast-charging battery cell module, making the installation process of the fast-charging battery cell module more convenient.

[0064] Refer to Figure 2 In order to better support and limit the bus bar 2, in this embodiment, a support frame 6 is further provided on the top of the arrangement of the battery cell units 1. The support frame 6 can be a grid-shaped frame body made of insulating material. The grid shape and distribution spacing of the support frame 6 are adapted to the shape and arrangement form of the bus bar 2. A total positive contact piece 601 and a total negative contact piece 602 are respectively installed at both ends of the support frame 6. Both the total positive contact piece 601 and the total negative contact piece 602 are electrically connected to the bus bar 2. The total positive contact piece 601 and the total negative contact piece 602 can serve as the positive output pole and the negative output pole of the fast-charging battery cell module, and realize the transmission of electric energy with the outside. The total positive contact piece 601 and the total negative contact piece 602 can be rectangular metal sheets made of copper.

[0065] By arranging a support frame 6 at the top of the battery cell unit 1, the busbar 2 can be supported and positioned, improving the stability of the busbar 2 within the battery pack. By arranging a total positive contact piece 601 and a total negative contact piece 602 at both ends of the support frame 6, the current conduction between the busbar 2 and the outside can be achieved. As the positive and negative output poles of the fast-charging battery cell module as a whole, the electrical energy is transmitted to the outside.

[0066] Embodiment 2

[0067] This embodiment relates to a battery pack, including the fast-charging battery cell module described in Embodiment 1.

[0068] In this embodiment, through the fast-charging battery cell module described in Embodiment 1, the busbar 2 used to connect the battery cell unit 1 is in direct contact with the cold plate 3, thus serving as a bridge for heat exchange between the pole of the battery cell unit 1 and the cold plate 3. The heat generated by the pole of the battery cell unit 1 can be transferred to the cold plate 3 through the busbar 2 and then conducted to the outside by the cold plate 3, thereby achieving the invention purpose of effectively controlling the temperature of the battery cell pole and meeting the heat dissipation performance requirements of the fast-charging battery cell.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A fast-charging battery cell module, characterized in that: It includes battery cell units, which are multiple and arranged along the thickness direction of the battery cells themselves; A busbar is arranged on the top of the arrangement of the battery cell units and is electrically connected to the battery cell units; Cold plates are symmetrically arranged on both sides of the arrangement of the battery cell units and are attached to the side walls of the battery cell units; The busbar includes a conduction part that fits on the top of the battery cell units and a heat dissipation part vertically arranged on the conduction part, and the heat dissipation part is attached to the cold plate.

2. The fast-charging battery cell module according to claim 1, characterized in that: The cold plate includes a plate body, and a flow channel cavity is opened on the plate body; Liquid inlets and outlets are respectively opened at both ends of the plate body, and a cooling medium enters the flow channel cavity from the liquid inlet and is discharged from the liquid outlet of the flow channel cavity.

3. The fast-charging battery cell module according to claim 2, characterized in that: The projection of the flow channel cavity on the plate body is in the shape of a "mouth".

4. The fast-charging battery cell module according to claim 2, characterized in that: A heat-conducting structural adhesive is applied on the contact surface between the plate body and the battery cell units.

5. The fast-charging battery cell module according to claim 1, characterized in that: It further includes a top cover, and the top cover covers the top of the cold plate and cooperates with the cold plate to cover the busbar inside.

6. The fast-charging battery cell module according to claim 5, characterized in that: The heat dissipation part extends horizontally to form a limiting part, and the limiting part is attached to the top cover; a plurality of fastening bolts are vertically penetrated through the top cover and the upper edge of the limiting part.

7. The fast-charging battery cell module according to claim 1, characterized in that: End plates are respectively arranged at the head and tail ends of the arrangement of the battery cell units.

8. The fast-charging battery cell module according to claim 1, characterized in that: A support frame is fixedly arranged on the top of the battery cell units, and the support frame forms a limiting support for the busbar.

9. The fast-charging battery cell module according to claim 8, characterized in that: A total positive contact piece and a total negative contact piece are respectively arranged at both ends of the support frame, and the total positive contact piece and the total negative contact piece are electrically connected to the busbar.

10. A battery pack, characterized in that: It includes a fast-charging battery cell module, and the fast-charging battery cell module as described in any one of claims 1 to 9 is adopted.

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