CN115513586A - Battery modules, battery packs and electrical equipment - Google Patents

Abstract

The application provides a battery module, a battery pack and electrical equipment, which relate to the technical field of power batteries. The battery module includes: several battery cells, the left and right ends of which are provided with output poles, and several battery cells are distributed along the front and rear directions; It is configured to receive a battery cell for cooling a large face of the battery cell. The liquid cooling system is provided with a housing cavity, so that the battery cells are placed in the housing cavity, and several battery cells are connected in series and parallel to realize charging and discharging. The liquid cooling system can cool the large surface of each battery core to realize the The cells conduct heat better.

Description

Battery modules, battery packs and electrical equipment

technical field

The present application relates to the technical field of power batteries, in particular, to a battery module, a battery pack and electrical equipment.

Background technique

Nowadays, with the rapid development of new energy vehicles, power batteries are an important part of new energy vehicles, and with the continuous improvement of capacity, energy density and charge-discharge rate, power battery packs with integrated liquid cooling systems are becoming more and more popular. people's attention. The reliability of its power battery pack with liquid cooling system directly determines the safety of the power battery pack.

In related technologies, limited by the positive and negative poles on both sides of the battery pack, a liquid cooling plate is often arranged on the top or bottom of the battery pack, which is difficult to achieve better heat conduction for the battery pack.

Contents of the invention

The purpose of the present application is to provide a battery module, a battery pack and an electrical device capable of cooling the large surface of the battery cell to achieve better heat conduction to the battery cell.

In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

In the first aspect, the present application provides a battery module, including: several battery cells, the left and right ends of the battery cells are provided with output poles, and several of the battery cells are distributed along the front and rear directions; a liquid cooling system, There are several accommodating cavities arranged at intervals along the front-rear direction, and the accommodating cavities are configured for accommodating the electric core, so as to cool the large surface of the electric core.

In the process of the above implementation, the liquid cooling system is provided with a housing cavity, so that the battery cells are placed in the housing cavity, and several battery cells are connected in series and parallel, so that when charging and discharging, the liquid cooling system can control the temperature of each battery cell. The large surface is cooled to achieve better heat conduction to the battery cell.

In some embodiments, the liquid cooling system includes a liquid collecting pipe and a liquid cooling plate, and several liquid cooling plates are arranged along the front and rear directions, and the liquid collecting pipe is connected with the liquid cooling plate to connect several liquid cooling plates. The liquid cold plate is connected.

In the process of the above implementation, the liquid collecting pipe is connected to several liquid cooling plates, so that when the cooling liquid flows to the liquid cooling system, it can flow through each liquid cooling plate in turn to realize the cooling of the large surface of each battery cell. Ensure the consistency of the cell temperature.

In some embodiments, there are two liquid collecting pipes, and one of the liquid collecting pipes is located on the left side of the liquid cooling plate, and the other liquid collecting pipe is located on the right side of the liquid cooling plate , so that one of the liquid collecting pipes forms a liquid outlet, and the other liquid collecting pipe forms a liquid inlet. It is conducive to the circulation of coolant and the pipeline layout of the battery pack, improving space utilization.

In some embodiments, both left and right ends of the liquid cooling plate are provided with extensions for forming avoidance openings, and the avoidance openings are configured for avoidance of the output poles, and the extensions communicated with the collecting pipe.

In the process of the above realization, the liquid cooling plate is provided with an extension part, and can form an avoidance port for avoiding the output pole, and at the same time, the liquid collecting pipe communicates with the extension part, so that the output pole and the liquid cooling system are separated from each other , to ensure electrical safety, prevent short circuit and other problems, and also realize the integrated layout of large surface liquid cooling of batteries.

In some embodiments, the battery module further includes a bus bar configured to be connected to the output poles of two adjacent battery cells for the connection between the two battery cells. Series and parallel.

In some embodiments, the bus bar is provided with a bent portion, the bent portion is located between the output poles of two adjacent battery cells, and the bent portion is configured to move away from the battery core along the The direction bend setting.

In the above implementation process, the bus bar is provided with a bent portion, so that when the bus bar connects two adjacent battery cells in series and parallel, it can absorb assembly tolerances and manufacturing tolerances, which is beneficial to the connection and assembly of the battery cells.

In some embodiments, the battery module further includes a module casing, and the module casing has an accommodating space configured to accommodate the battery cell and the liquid cooling system.

In some embodiments, the module case includes an upper cover and a main part of the case, the upper cover is disposed on the upper end of the main part of the case, and the main part of the case is configured to support the electric core.

In a second aspect, the present application further provides a battery pack, including the battery module as described in any one of the above.

Since the battery pack provided by the embodiment of the second aspect of the present application includes the battery module described in the technical solution of the first aspect, it has all the technical effects of the above-mentioned embodiments, and will not be repeated here.

In a third aspect, the present application further provides an electric device, which is characterized in that it includes the above-mentioned battery pack.

Since the electrical equipment provided by the embodiment of the third aspect of the present application includes the battery pack described in the technical solution of the second aspect, it has all the technical effects of the above-mentioned embodiments, and will not be repeated here.

Other features and advantages of the present application will be set forth in the ensuing description and, in part, will be apparent from the description, or can be learned by practicing the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so It should be regarded as a limitation on the scope, and users of ordinary skill in the art can also obtain other related drawings based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a battery module disclosed in an embodiment of the present application.

Fig. 2 is an exploded schematic diagram of a battery module disclosed in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a liquid cooling system for a battery module disclosed in an embodiment of the present application.

Fig. 4 is a partial structural schematic diagram of a battery module disclosed in an embodiment of the present application.

FIG. 5 is a schematic structural view of FIG. 4 from another viewing angle.

FIG. 6 is a schematic structural diagram of a bus bar of a battery module disclosed in an embodiment of the present application.

reference sign

100, battery cell; 200, liquid cooling system; 201, liquid collecting pipe; 202, liquid cooling plate; 2021, extension part; 300, bus bar; 301, bending part; 400, upper cover;

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by users of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of this application, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Users of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

Example

In this application, the mentioned cell can provide a single physical module of voltage and capacity, that is, the cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator, The battery mainly relies on metal ions to move between the positive pole piece and the negative pole piece; wherein the positive pole piece includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive current collector coated with the positive active material layer protrudes from the positive current collector coated with the positive active material layer, and the positive current collector not coated with the positive active material layer serves as the positive tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode collector without the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. Fluid, the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).

The development of battery technology should consider many design factors at the same time, such as discharge capacity, charge and discharge rate, service life and energy density, and safety performance should also be considered.

For batteries with positive and negative poles on the left and right sides, a liquid cold plate is often arranged on the top of the battery pack, such as BYD’s blade battery, or a liquid cold plate is arranged at the bottom of the battery pack, such as the L6 battery pack of Honeycomb Power. , according to the characteristics of the battery cell, the larger the contact area between the battery cell and the liquid-cooled plate, the better the temperature control effect. Therefore, it should be the most ideal integration solution to liquid-cool the large surface of the battery cell, but it is limited by There are positive and negative poles on the left and right sides of the battery cell, so the high-voltage connection and the liquid cooling system will occupy space, and it is difficult to realize the integrated arrangement of the high-voltage connection and the liquid cooling system.

In view of this, as shown in Figures 1-2, in the first aspect, the present application provides a battery module, including: a battery cell 100 and a liquid cooling system 200, the battery cell 100 is provided with several, and the several The battery cells 100 are distributed at intervals along the front and rear directions, and the battery cells 100 are distributed along the left and right directions, and the left and right sides of the battery cells 100 are provided with output poles, the liquid cooling system 200 has a housing cavity, and the battery cells 100 It is arranged in the accommodating cavity, so that the liquid cooling system 200 can cool the electric core 100 .

Specifically, a plurality of battery cells 100, the left and right ends of the battery cells 100 are provided with output poles, and several of the battery cells 100 are distributed along the front and rear directions; the liquid cooling system 200 is spaced along the front and rear directions A plurality of accommodation cavities are provided, and the accommodation chambers are configured to accommodate the electric core 100 for cooling a large surface of the electric core 100 .

Exemplarily, the output poles are positive and negative poles, the output poles can be protruded on the surface of the battery cell 100, and the size of the output poles and the height relative to the upper end of the battery cell 100 are not changed. Special restrictions may be that the height of the output pole is 85mm to 120mm, preferably 100mm, and the distance h between the upper surface of the output pole and the upper surface of the battery cell 100 may be 20mm≤h≤1/ 2 The height of the battery cell 100 is preferably 25 mm, and the height of the output pole ≥ 1/2 the height of the battery cell 100, which is preferably 60 mm.

In the above implementation process, the liquid cooling system 200 is provided with a housing cavity, so that the battery cell 100 is placed in the housing cavity, and several battery cells 100 are connected in series and parallel to realize charging and discharging. The liquid cooling system 200 can The large surface of a cell 100 is cooled to achieve better heat conduction to the cell 100 .

As shown in FIG. 3 , the liquid cooling system 200 includes a liquid collecting pipe 201 and a liquid cooling plate 202, and several liquid cooling plates 202 are arranged along the front and rear directions. connected to connect several liquid cooling plates 202 . Exemplarily, the liquid collecting pipe 201 is distributed along the front-rear direction, and the liquid collecting pipe 201 may be located above the output pole, or below the output pole, while the liquid collecting The tube 201 communicates with the liquid cooling plate 202 , so that the cooling liquid can flow to each of the liquid cooling plates 202 sequentially through the liquid collecting pipe 201 , so as to ensure the consistency of the temperature of each of the battery cells 100 .

In the process of the above implementation, the liquid collecting pipe 201 is connected to several liquid cooling plates 202, so that when the cooling liquid flows to the liquid cooling system 200, it can flow through each liquid cooling plate 202 in turn, realizing the cooling of each battery cell 100. The large surface is cooled to ensure the consistency of the battery cell 100 temperature.

In some embodiments, there are two liquid collecting pipes 201, and one of the liquid collecting pipes 201 is located on the left side of the liquid cooling plate 202, and the other liquid collecting pipe 201 is located on the left side of the liquid cooling plate 202. The right side of the plate 202, so that one of the liquid collecting pipes 201 forms a liquid outlet, and the other liquid collecting pipe 201 forms a liquid inlet, that is, the cooling liquid flows through one of the liquid collecting pipes 201 to the The liquid cooling plate 202 passes through the liquid cooling plate 202 to the other liquid collecting pipe 201, and flows into the liquid storage tank of the battery pack through the liquid outlet to form a circulation, which is beneficial to the circulation of cooling liquid And the pipeline layout of the battery pack improves space utilization.

In some embodiments, the left and right ends of the liquid cooling plate 202 are provided with extensions 2021 for forming avoidance openings, and the avoidance openings are configured for avoidance of the output poles, and the The extension part 2021 communicates with the liquid collector 201. Specifically, the extension part 2021 can be located above the output pole, or below the output pole. The extension 2021 is connected to the output pole. The interior of the liquid cooling plate 202 is connected, so that the cooling liquid can enter the interior of the liquid cooling plate 202 through the extension portion 2021 or flow out from the interior of the liquid cooling plate 202 through the extension portion 2021 .

In the process of the above implementation, the liquid cooling plate 202 is provided with an extension part 2021, and can form an avoidance port for avoiding the output pole, and at the same time, the liquid collecting pipe 201 communicates with the extension part 2021, so that the output pole and the liquid The cooling systems 200 are separated from each other, which ensures electrical safety, prevents problems such as short circuits, and also realizes the integrated layout of the large-surface liquid cooling of the battery cells 100 .

As shown in FIGS. 4-6 , the battery module further includes a bus bar 300 configured to be connected to the output poles of two adjacent battery cells 100 for the two A series-parallel connection of the batteries 100.

In some embodiments, the bus bar 300 is provided with a bent portion 301, which can be formed by stamping or integral molding, and the bent portion 301 is located between two adjacent battery cells 100 between the output poles, and the bending portion 301 is configured to be bent in a direction away from the battery cell 100 .

In the process of the above implementation, the bus bar 300 is provided with a bent portion 301, so that when the bus bar 300 connects two adjacent battery cells 100 in series and parallel, it can absorb assembly tolerances and manufacturing tolerances, which is beneficial to the connection between the battery cells 100. connection and assembly.

In some embodiments, the battery module further includes a module casing, the module casing has an accommodating space, and the accommodating space is configured to accommodate the battery cell 100 and the liquid cooling system 200. The module case includes an upper cover 400 and a main part 401 of the case, the upper cover 400 is arranged on the upper end of the main part 401 of the case, and the main part 401 of the case is configured to support the electric core 100. It should be noted that the module casing may be the casing of the battery pack, or the casing of the battery module.

In a second aspect, the present application further provides a battery pack, including the battery module as described in any one of the above. Exemplarily, the battery pack further includes a wire harness isolation board assembly and a battery management system, etc., and the wire harness isolation board assembly is used to connect with the battery cells to transmit information such as the voltage and temperature of the battery cells to the battery pack. the battery management system.

Since the battery pack provided by the embodiment of the second aspect of the present application includes the battery module described in the technical solution of the first aspect, it has all the technical effects of the above-mentioned embodiments, and will not be repeated here.

In a third aspect, the present application further provides an electric device, which is characterized in that it includes the above-mentioned battery pack. The electrical equipment may be an electric toy, an electric tool, a battery car, an electric vehicle or a spacecraft, etc. When the electrical equipment is a vehicle, the vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle. Energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles. The interior of the vehicle is provided with a battery pack, and the battery pack can be provided at the bottom, head or tail of the vehicle. The battery pack can be used for power supply of the vehicle, for example, the battery pack can be used as an operating power source of the vehicle. The vehicle may also include a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, for starting, navigating, and working power requirements during driving of the vehicle.

Since the electrical equipment provided by the embodiment of the third aspect of the present application includes the battery pack described in the technical solution of the second aspect, it has all the technical effects of the above-mentioned embodiments, and will not be repeated here.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A battery module, comprising:

the battery comprises a plurality of battery cells, wherein output poles are arranged at the left end and the right end of each battery cell, and the battery cells are distributed along the front and back directions;

and the liquid cooling system is provided with a plurality of accommodating cavities at intervals along the front-back direction, and the accommodating cavities are configured to accommodate the battery cell so as to be used for cooling the large surface of the battery cell.

2. The battery module according to claim 1, wherein the liquid cooling system comprises a plurality of liquid collecting pipes and liquid cooling plates, the plurality of liquid cooling plates are arranged in the front-back direction, and the liquid collecting pipes are connected with the liquid cooling plates to communicate the plurality of liquid cooling plates.

3. The battery module according to claim 2, wherein there are two liquid collection tubes, and one of the liquid collection tubes is located on the left side of the liquid-cooled plate and the other of the liquid collection tubes is located on the right side of the liquid-cooled plate, such that one of the liquid collection tubes forms a liquid outlet and the other of the liquid collection tubes forms a liquid inlet.

4. The battery module according to claim 2, wherein the left and right ends of the liquid cooling plate are provided with extending portions for forming an avoiding port, the avoiding port is configured to be used for avoiding the output pole, and the extending portions are communicated with the liquid collecting pipe.

5. The battery module of claim 1, further comprising a bus bar configured to connect with output terminals of two adjacent cells for series-parallel connection of the two cells.

6. The battery module according to claim 5, wherein the busbar is provided with a bent portion, the bent portion is located between output poles of two adjacent battery cores, and the bent portion is configured to be bent in a direction away from the battery cores.

7. The battery module as recited in claim 1, further comprising a module housing having a receiving space configured to receive the cell and the liquid cooling system.

8. The battery module of claim 7, wherein the module housing comprises an upper cover and a housing base, the upper cover being disposed at an upper end of the housing base, the housing base being configured to support the cells.

9. A battery pack comprising the battery module according to any one of claims 1 to 8.

10. An electric device comprising the battery pack according to claim 9.

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