Battery and power device

Abstract

The utility model provides a battery and a power plant, the battery of the utility model comprises a battery module, a liquid cooling plate arranged at the top of the battery module, and busbar assemblies respectively arranged at two sides of the battery module, and a heat pipe is arranged at the busbar assembly at at least one side; each heat pipe is provided with an evaporation section abutting against the busbar assembly on the corresponding side and a condensation section abutting against the part, located on the same side, of the liquid cooling plate. According to the battery disclosed by the utility model, when heat dissipation treatment is carried out, a lateral cooling cold plate does not need to be additionally arranged, the busbar and the overhead liquid cooling plate can be connected by utilizing a heat pipe principle to realize heat dissipation, and the problems that a heat dissipation device is difficult to arrange and the heat exchange efficiency is weak in the prior art are solved.

Description

Technical Field

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

[0002] At present, the range of mainstream electric passenger cars at home and abroad generally exceeds 600 kilometers, and high-end models even exceed 1,000 kilometers. Consumers' anxiety about the range has been resolved, but the demand for convenient energy replenishment has become more urgent. Battery replacement and dedicated fast charging piles are currently the main solutions. Among them, high-voltage and high-rate fast charging has become the mainstream development direction.

[0003] In the power battery segment, the fast charging capability of the battery mainly depends on the rapid embedding capability of the negative electrode of the battery cell, the conductivity of the electrolyte, and the battery thermal management system. With fast charging above 4C (the battery is fully charged in a quarter of an hour) or even 6C (the battery is fully charged in one-sixth of an hour), the problem of severe heating of the battery cells and buses is more prominent, and the battery cells are mainly solved by reducing the internal resistance and increasing the heat exchange power of the thermal management system. For the short-blade battery, compared with fast charging below 2C (the battery is fully charged in one-half hour), the heat generated by the bus under a fast charging current of 4C or even above 6C increases sharply, causing the local temperature of the battery head to be too high and requiring heat dissipation.

[0004] At present, the bus of the short knife battery is generally placed on the side. The conventional method for heat dissipation is to add a lateral cold plate to cool the bus separately. However, there will be problems such as many pipe joints, difficult space arrangement, and electrical insulation between the cooling fluid and the bus. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery to solve the problems of difficult layout and low heat exchange efficiency during heat dissipation.

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

[0007] A battery comprises a battery module, a liquid cooling plate arranged on the top of the battery module, and bus assemblies arranged on both sides of the battery module, and a heat pipe is arranged at at least one side of the bus assembly; the heat pipe has an evaporation section abutting against the bus assembly on the corresponding side, and a condensation section abutting against the part of the liquid cooling plate on the same side.

[0008] Furthermore, the heat pipe is in an inverted L-shape and includes a horizontal top wall and a vertical side wall, and a connecting wall connected between the top wall and the side wall; the side wall is fitted with the bus assembly, the top wall is fitted with the liquid cooling plate, and the evaporation section is formed between the side wall and the connecting wall, and the condensation section is formed between the top wall and the connecting wall.

[0009] Furthermore, the connecting wall includes a bottom section connected to the side wall, a top section connected to the top wall, and a guide section connected between the bottom section and the top section, and the bottom section is parallel to the top wall, and the top section is parallel to the side wall.

[0010] Furthermore, the guide section is bent toward one side of the corner formed by the top wall and the side wall, and is formed with a guide portion connected to the top section and a vertical portion connected to the bottom section.

[0011] Furthermore, the angle between the drainage portion and the top wall is between 30° and 60°.

[0012] Furthermore, an insulating coating is provided on a side of the side wall facing the busbar assembly.

[0013] Furthermore, the side wall is connected to the bus assembly via a thermally conductive structural adhesive layer, and the thermally conductive structural adhesive layer is located between the bus assembly and the insulating coating; and / or the top wall is connected to the liquid cooling plate via a thermally conductive structural adhesive layer.

[0014] Furthermore, the heat pipe is filled with a preset amount of heat transfer medium, and the heat transfer medium can evaporate into a gaseous state after heat exchange between the evaporation section and the bus assembly. The gaseous heat transfer medium is re-condensed into a liquid state after heat exchange between the condensation section and the liquid cooling plate, and refluxes to the evaporation section of the heat pipe under the action of gravity.

[0015] Furthermore, the battery module includes a plurality of battery cells arranged in sequence, the same ends of two adjacent battery cells are connected by a bus, and each bus forms the bus assembly; the heat pipe is a plurality of heat pipes arranged in sequence along the arrangement direction of each battery cell, and one heat pipe is provided corresponding to a plurality of bus bars.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery described in the utility model can not only improve the heat dissipation efficiency of the bus by arranging a heat pipe, but also reduce the difficulty of space arrangement and improve the structural stability compared to arranging a cold plate. In addition, the evaporation section abuts against the bus, and the condensation section abuts against the liquid cooling plate. The liquid cooling plate can also be used to cool the working medium inside the heat pipe, thereby further improving the heat exchange effect.

[0018] In addition, the heat pipe is set in an inverted L-shape, with its side wall fitted with the bus, and the top wall combined with the liquid cooling plate. The advantage of such a setting is that the contact area between the heat pipe and the liquid cooling plate, as well as between the heat pipe and the bus, is increased, thereby improving the heat exchange efficiency. The guide section is set to be bent to one side of the angle formed by the top wall and the side wall, which not only facilitates the condensation and reflux of the working medium, but also reduces the space occupied in the package. At the same time, the angle between the drainage part of the guide section and the top wall can be between 30 and 60 degrees, so that the condensation and reflux of the remote working medium is easier.

[0019] Secondly, an insulating coating is applied between the side wall of the heat pipe and the busbar, which is beneficial to improve the insulation performance, prevent current leakage, and improve safety. The side wall of the heat pipe is connected to the busbar assembly through a thermally conductive structural adhesive layer, and the thermally conductive structural adhesive layer is located between the busbar assembly and the insulating coating. At the same time, the top wall of the heat pipe is also connected to the liquid cooling plate through a thermally conductive structural adhesive layer. This setting can better transfer heat, thereby improving the heat dissipation effect of the battery, and can also play a fixing role and improve the stability of the bonding.

[0020] Furthermore, the heat pipes are arranged in multiple numbers, which is conducive to reducing the manufacturing difficulty and realizing standardized design. When a heat pipe is damaged, only the heat pipe in the same order needs to be replaced, which is conducive to reducing the maintenance cost. At the same time, one heat pipe corresponds to multiple bus bars, which is conducive to reducing the installation difficulty.

[0021] In addition, another object of the present invention is to provide a power device, in which the battery as described above is provided.

[0022] The power device of the present invention and the above-mentioned battery have the same beneficial effects as the conventional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 This is a schematic diagram of the overall structure of the battery according to an embodiment of the utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the part indicated by section BB;

[0026] Figure 3 for Figure 2 A magnified view of the part shown in middle A;

[0027] Figure 4This is a schematic diagram of the structure of the heat pipe according to an embodiment of the utility model;

[0028] Description of reference numerals:

[0029] 1. heat pipe; 11. top wall; 111. condensing section; 12. side wall; 121. evaporating section; 122. insulating coating; 123. heat conductive structural adhesive layer; 13. connecting wall; 131. bottom section; 132. top section; 133. flow guiding section; 1331. flow guiding part; 1332. vertical part;

[0030] 2. Liquid cooling plate; 21. Cooling liquid inlet; 22. Cooling liquid outlet;

[0031] 3. Bus assembly; 31. Bus;

[0032] 4. Battery cells;

[0033] 5. Battery cell riveting block. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Embodiment 1

[0039] The present embodiment relates to a battery that can solve the problems of difficult layout and low heat exchange efficiency during heat dissipation.

[0040] In terms of overall structure, Figure 1 As shown, the battery of this embodiment includes a battery module, a liquid cooling plate 2 arranged on the top of the battery module, and bus assemblies 3 arranged on both sides of the battery module, and a heat pipe 1 is provided at at least one side of the bus assembly 3.

[0041] The heat pipe 1 has an evaporation section 121 abutting against the busbar assembly 3 on the corresponding side, and a condensation section 111 abutting against the portion of the liquid cooling plate 2 located on the same side.

[0042] Specifically, in this embodiment, as an exemplary structure, by arranging a heat pipe 1 at the bus assembly 3 on at least one side, preferably, arranging a heat pipe 1 at the bus assembly 3 on both sides, not only can the heat dissipation efficiency of the bus assembly 3 be improved, but also compared with setting a cold plate, the difficulty of spatial arrangement can be reduced and the structural stability can be improved. Moreover, the evaporation section 121 is abutted against the bus assembly 3, and the condensation section 111 is abutted against the liquid cooling plate 2. The liquid cooling plate 2 can also be used to cool the working medium inside the heat pipe 1, thereby further improving the heat exchange effect.

[0043] It is worth mentioning that the relevant structural parts not mentioned in the battery of this embodiment can refer to the various structures of the battery known to those skilled in the art. For example, the battery also includes a battery module composed of multiple battery cells 4 arranged on the liquid cooling plate 2, a coolant inlet 21 and a coolant outlet 22 arranged on the liquid cooling plate 2, and a battery cell rivet block 5 for connecting the bus assembly 3 and the battery cell 4.

[0044] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 2 and Figure 4 As shown, the heat pipe 1 is in an inverted L-shape and includes a horizontal top wall 11 , a vertical side wall 12 , and a connecting wall 13 connected between the top wall 11 and the side wall 12 .

[0045] At the same time, the side wall 12 is fitted with the bus assembly 3 , the top wall 11 is fitted with the liquid cooling plate 2 , the evaporation section 121 is formed between the side wall 12 and the connecting wall 13 , and the condensation section 111 is formed between the top wall 11 and the connecting wall 13 .

[0046] The advantage of such a configuration is that it helps to increase the contact area between the heat pipe 1 and the liquid cooling plate 2, and between the heat pipe 1 and the bus assembly 3, thereby improving the heat exchange efficiency.

[0047] Furthermore, in this embodiment, as a preferred implementation form, Figure 4As shown, the connecting wall 13 includes a bottom section 131 connected to the side wall 12 , a top section 132 connected to the top wall 11 , and a guide section 133 between the bottom section 131 and the top section 132 , and the bottom section 131 is parallel to the top wall 11 , and the top section 132 is parallel to the side wall 12 .

[0048] It can be understood that the connecting wall 13 is composed of a bottom section 131 connected to the side wall 12, a top section 132 connected to the top wall 11, and a guide section 133 connected between the bottom section 131 and the top section 132. It has a simple structure, is easy to arrange, and is convenient for condensation and reflux of the working medium.

[0049] Here, in this embodiment, as a preferred implementation form, Figure 4 As shown, the guide section 133 is bent toward the corner formed by the top wall 11 and the side wall 12, and is formed with a guide portion 1331 connected to the top section 132, and a vertical portion 1332 connected to the bottom section 131. This arrangement is not only conducive to condensation reflux, but also can reduce the space occupied in the package.

[0050] In the specific structure, the angle between the drainage portion 1331 and the top wall 11 is between 30° and 60°. By setting it within this range, the remote working medium can be more easily condensed and refluxed. In order to achieve a better reflux effect, the angle between the drainage portion 1331 and the top wall 11 can be specifically 30°, 45° or 60°.

[0051] In addition, as a preferred embodiment, Figure 3 As shown, the side of the side wall 12 of this embodiment facing the bus assembly 3 is coated with an insulating coating 122. The provision of the insulating coating is beneficial to improving the insulation performance, preventing current leakage, and thus improving the overall safety of the battery.

[0052] At the same time, in this embodiment, as a preferred implementation form, the side wall 12 is connected to the bus assembly 3 through a thermally conductive structural adhesive layer 123, and the thermally conductive structural adhesive layer 123 is located between the bus assembly 3 and the insulating coating 122. At the same time, the top wall 11 is connected to the liquid cooling plate 2 through a thermally conductive structural adhesive layer 123.

[0053] Such a setting can better transfer heat, thereby improving the heat dissipation effect of the battery, and can also play a fixing role and improve the stability of the bonding.

[0054] Furthermore, as a preferred implementation form, the heat pipe 1 of this embodiment is filled with a preset amount of heat transfer medium, and the heat transfer medium can evaporate into a gaseous state after heat exchange between the evaporation section 121 and the bus assembly 3. The gaseous heat transfer medium is re-condensed into a liquid state after heat exchange between the condensation section 111 and the liquid cooling plate 2, and flows back to the evaporation section 121 of the heat pipe 1 under the action of gravity.

[0055] In specific implementation, the heat transfer medium absorbs heat in the evaporation section 121 and evaporates into a gas. The gaseous medium moves upward and releases heat after reaching the condensation 111, and is converted into a liquid medium. Under the action of gravity, it slides down along the connecting wall 13 and converges to the evaporation section 121, thereby achieving cyclic heat dissipation and improving heat exchange efficiency.

[0056] Continue to see Figure 1 As shown, in this embodiment, as a preferred implementation form, the battery module includes a plurality of battery cells 4 arranged in sequence, and the same ends of two adjacent battery cells 4 are connected by a bus 31, and each bus 31 forms a bus assembly 3.

[0057] Furthermore, there are a plurality of heat pipes 1 which are sequentially arranged along the arrangement direction of the battery cells 4 , and one heat pipe 1 is provided corresponding to a plurality of bus bars 31 .

[0058] Here, multiple heat pipes 1 are provided, which is conducive to reducing manufacturing difficulty and realizing standardized design. When a heat pipe 1 is damaged, only the heat pipe 1 that is replaced can be replaced, which is conducive to reducing maintenance costs. At the same time, one heat pipe 1 is provided corresponding to multiple bus bars 31, which is conducive to reducing installation difficulty.

[0059] In the specific structure, the number of heat pipes 1 and bus bars 31 can be set and adjusted accordingly according to actual needs, which is conducive to reducing the difficulty of manufacturing and installing the heat pipes 1. It can be set so that one heat pipe 1 is installed for every three bus bars 31.

[0060] The battery involved in this embodiment, during the heat dissipation treatment, allows the coolant to flow in from the coolant inlet 21, and after heat exchange with the battery cell 4 and the heat pipe 1, flows out through the coolant outlet 22. At the same time, the heat pipe 1 adopts an inverted L-shaped design, wherein the liquid working medium absorbs heat in the evaporation section 121 close to the bus assembly 3 and becomes a gaseous working medium. The gaseous working medium moves upward and releases heat when reaching the condensation section 111, and becomes a liquid working medium, so that it flows back to the evaporation section 121 along the pipe wall under the action of gravity, so that the battery no longer needs to add a cold plate for lateral cooling, and the heat dissipation of the side-placed bus assembly 3 can be achieved by connecting the bus assembly 3 and the top liquid cold plate 2 using the heat pipe principle.

[0061] Embodiment 2

[0062] This embodiment relates to a power device, which is also equipped with the battery in the first embodiment.

[0063] The power device of this embodiment, by setting the battery in the first embodiment, no longer needs to add a cold plate for lateral cooling during heat dissipation treatment. The heat pipe principle is used to connect the bus assembly 3 and the top liquid cooling plate 2 to achieve heat dissipation of the bus assembly 3, thereby solving the problems of difficult layout of the heat dissipation device and weak heat exchange efficiency in the prior art, thereby improving the overall performance, thereby having better product quality and market competitiveness.

[0064] 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, characterized in that: It comprises a battery module, a liquid cooling plate arranged on the top of the battery module, and bus assemblies arranged on both sides of the battery module, and a heat pipe is arranged at at least one side of the bus assemblies; The heat pipe comprises an evaporation section abutting against the busbar assembly on the corresponding side, and a condensation section abutting against a portion of the liquid cooling plate located on the same side.

2. The battery according to claim 1, characterized in that: The heat pipe is in an inverted L-shape and includes a horizontal top wall, a vertical side wall, and a connecting wall connected between the top wall and the side wall; The side wall is fitted with the busbar assembly, the top wall is fitted with the liquid cooling plate, the evaporation section is formed between the side wall and the connecting wall, and the condensation section is formed between the top wall and the connecting wall.

3. The battery according to claim 2, characterized in that: The connecting wall includes a bottom section connected to the side wall, a top section connected to the top wall, and a guide section connected between the bottom section and the top section, wherein the bottom section is parallel to the top wall, and the top section is parallel to the side wall.

4. The battery according to claim 3, characterized in that: The guide section is bent toward a corner formed by the top wall and the side wall, and is provided with a guide portion connected to the top section and a vertical portion connected to the bottom section.

5. The battery according to claim 4, characterized in that: The angle between the drainage portion and the top wall is between 30° and 60°.

6. The battery according to claim 2, characterized in that: An insulating coating is provided on a side of the side wall facing the busbar assembly.

7. The battery according to claim 6, characterized in that: The side wall is connected to the busbar assembly via a heat-conducting structural adhesive layer, and the heat-conducting structural adhesive layer is located between the busbar assembly and the insulating coating; and / or, The top wall and the liquid cooling plate are connected via a heat-conducting structural adhesive layer.

8. The battery according to claim 1, characterized in that: The heat pipe is filled with a preset amount of heat transfer medium, and the heat transfer medium can evaporate into a gaseous state after the evaporation section exchanges heat with the bus assembly. The gaseous heat transfer medium is re-condensed into a liquid state after the condensation section exchanges heat with the liquid cooling plate, and flows back to the evaporation section of the heat pipe under the action of gravity.

9. The battery according to any one of claims 1 to 8, characterized in that: The battery module comprises a plurality of battery cells arranged in sequence, and the same ends of two adjacent battery cells are connected via a bus bar, and each of the bus bars forms the bus bar assembly; The heat pipes are multiple and are arranged in sequence along the arrangement direction of the battery cells, and one heat pipe is arranged corresponding to multiple bus bars.

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

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