Top liquid cooling energy storage battery box

Abstract

A top liquid cooling energy storage battery box comprises a box body, a battery module, a liquid cooling plate and a water inlet and outlet component, the box body comprises a lower box body and a box cover, the top of the lower box body is open, the battery module is fixed in the lower box body, the box cover covers the top of the lower box body, and insulating sheets are fixed on the inner side of the bottom surface of the lower box body and the inner side of the box cover; the liquid cooling plate is located at the top end of the battery module, the battery module comprises a plurality of battery monomers and a busbar located at the top end of the battery monomers, the surface of the liquid cooling plate is coated with an insulating material, a heat-conducting structural adhesive is filled between the liquid cooling plate and the busbar, the liquid cooling plate is connected with a water inlet and outlet part, and the water inlet and outlet part is used for inlet and outlet of cooling liquid. According to the utility model, the busbar can be directly cooled, so that cold energy is transferred to the whole battery through the tabs and the current collector, and the temperature and temperature difference of the battery are quickly reduced; the utility model belongs to the technical field of energy storage batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, in particular to a top liquid-cooled energy storage battery box. Background Art

[0002] With the continuous development of electrochemical energy storage, the energy density and capacity of batteries are constantly increasing, and the heat generation is also increasing. As the core component in the electrochemical energy storage system, the battery operating temperature is too high or the temperature difference is too large, which will reduce the safety and life of the energy storage system, which puts higher requirements on the cooling system.

[0003] At present, the cooling method of energy storage battery boxes has gradually transitioned from air cooling to liquid cooling. The mainstream liquid cooling method is to fix the liquid cooling plate on the bottom of the battery to cool the battery. However, this liquid cooling method has obvious limitations. Since the high heat generation area in the battery module is concentrated on the busbar, battery lugs and poles, which are far away from the bottom of the battery, the use of bottom liquid cooling will cause a large temperature difference between the top and bottom of the battery during operation, which is not conducive to the life and safety of the battery. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the purpose of the utility model is to provide a top liquid-cooled energy storage battery box which can effectively dissipate heat from the high-heat generating area on the top of the battery.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a top liquid-cooled energy storage battery box, comprising a box body, a battery module, a liquid cooling plate and water inlet and outlet parts; the box body comprises a lower box body and a box cover, the top of the lower box body is open, the battery module is fixed in the lower box body, the box cover covers the top of the lower box body, and the inner side of the bottom surface of the lower box body and the inner side of the box cover are both fixed with insulating sheets; the liquid cooling plate is located at the top of the battery module, the battery module comprises a plurality of battery cells and a bus located at the top of the battery cells, the surface of the liquid cooling plate is coated with insulating material, the space between the liquid cooling plate and the bus bar is filled with heat-conductive structural glue, the liquid cooling plate is connected to the water inlet and outlet parts, and the water inlet and outlet parts are used for the inlet and outlet of cooling liquid.

[0006] After adopting this structure, during the battery charging and discharging process, the liquid cooling plate can directly cool the bus, and the bus and the battery pole are connected by welding, which has good thermal conductivity and can quickly transfer the cold to the battery pole, reducing the temperature of the bus and the battery ears and poles. Then the cold is transferred to the entire battery through the ears and the current collector, quickly reducing the temperature and temperature difference of the battery. In addition, by applying insulating material, the insulation between the liquid cooling plate and the bus is good, and there is an insulating sheet between the box and the battery, so the overall safety is high.

[0007] As a preferred embodiment, the battery module also includes an end plate and a steel belt. The end plate is provided with a limiter for fixing the steel belt. The steel belt binds the end plate and multiple battery cells tightly and fixes them. The multiple battery cells are arranged in a rectangular array, and the end plate is located at the front and rear ends of the rectangular array; a connector made of insulating material is fixed to the top of the end plate, and the liquid cooling plate is fixed to the connector by bolts.

[0008] As a preferred embodiment, buffer foam is provided between adjacent battery cells, and buffer foam and insulating sheets are provided between the battery cells and the end plates; there are multiple end plates at the front and rear ends of the rectangular array, and inter-module brackets are provided between adjacent end plates, and the inter-module brackets are provided with buckles for fixing the water inlet and outlet components.

[0009] As a preference, there are multiple liquid cooling plates, which are arranged in sequence above the bus at the same height, with gaps left between adjacent liquid cooling plates; and the multiple liquid cooling plates are arranged in parallel.

[0010] As a preferred embodiment, the water inlet and outlet components include an inlet pipe assembly, an outlet pipe assembly, a box water inlet pipe and a box water outlet pipe. The inlet and outlet of the liquid cooling plate are respectively connected with the cold plate water inlet pipe and the cold plate water outlet pipe. The cold plate water inlet pipe is connected to the box water inlet pipe via the inlet pipe assembly, and the cold plate water outlet pipe is connected to the box water outlet pipe via the outlet pipe assembly. The box water inlet pipe and the box water outlet pipe are both installed on the box and pass through the box.

[0011] As a preferred embodiment, the water inlet pipe assembly and the water outlet pipe assembly are composed of a quick-connect connector, a bellows, a first four-way connector, a first main water pipe, a second four-way connector, a second main water pipe and a three-way connector which are connected in sequence. The three-way connector of the water inlet pipe assembly is connected to the cold plate water inlet pipe, and the three-way connector of the water outlet pipe assembly is connected to the cold plate water outlet pipe.

[0012] As a preference, the first main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other, and the second main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other.

[0013] As a preferred embodiment, the liquid cooling plate includes a sealing piece and an extruded cold plate body, the sealing pieces are arranged at both ends of the cold plate body and seal the flow channel inside the cold plate body, and a water-blocking wall is arranged inside the cold plate body so that the flow channel is U-shaped; two circular through holes are arranged on the liquid cooling plate, and the two circular through holes are respectively connected to the two ends of the flow channel.

[0014] As a preferred embodiment, the outer side of the lower box body is provided with reinforcing ribs and fixing ears, the bottom of the lower box body is provided with two cross beams and four longitudinal beams for supporting the battery module, and the two ends of the longitudinal beams are respectively connected to the two cross beams; an explosion-proof valve is provided on the box cover, and a sealing gasket is provided at the connection between the box cover and the lower box body.

[0015] As a preferred embodiment, the insulating material is insulating varnish with a thickness of 0.2 mm, and the thickness of the insulating sheet is 0.5 mm.

[0016] In general, the utility model has the following advantages:

[0017] (1) The liquid cooling plate directly cools the battery pole through the busbar. The cooling effect is fast, which can quickly reduce the overheating of the battery pole and lug caused by current concentration, and quickly even out the overall battery temperature.

[0018] (2) Compared with bottom liquid cooling, top liquid cooling can directly solve the problem of uneven heating of various battery components and effectively control the overall temperature by lowering the temperature of the high heat generation area on the top of the battery. Compared with immersion liquid cooling, the overall structure of the battery box is slightly changed, the cost is low, and there is no short circuit problem caused by electrolyte valve explosion.

[0019] (3) By connecting the water inlets and outlets of multiple liquid cooling plates in parallel, the difference in the temperature and flow rate of the coolant flowing through the multiple liquid cooling plates is reduced, thereby ensuring the temperature uniformity between the battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded schematic diagram of a top liquid-cooled energy storage battery box;

[0021] Figure 2 It is a schematic diagram of the structure after removing the box cover;

[0022] Figure 3 It is a structural schematic diagram of the lower box;

[0023] Figure 4 It is a structural diagram of a battery module;

[0024] Figure 5 This is the front view of the battery module and liquid cooling plate;

[0025] Figure 6 It is a side view of the battery module and liquid cooling plate;

[0026] Figure 7 yes Figure 6 A magnified image of area A;

[0027] Figure 8 It is a schematic diagram of the structure of the end plate and the connector;

[0028] Fig. 9 It is a schematic diagram of the structure of the liquid cooling plate flow channel;

[0029] Fig.10 It is an exploded schematic diagram of the liquid cooling plate, the cold plate water inlet pipe, and the cold plate water outlet pipe;

[0030] Fig.11It is a schematic diagram of the structure of the water inlet pipe assembly and the water outlet pipe assembly.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 110-box cover, 111-explosion-proof valve, 120-lower box, 121-crossbeam, 122-longitudinal beam, 123-reinforcement rib, 124-fixing lug, 130-sealing gasket, 140-insulating sheet; 200-battery module, 210-busbar, 220-buffer foam, 230-end plate, 231-limiter, 240-steel belt, 250-connector, 260-inter-module bracket, 270-clip, 280-battery monomer; 300- Liquid cooling plate, 310-sealing piece, 320-water partition wall; 400-water inlet and outlet parts, 410-cold plate water inlet pipe, 420-cold plate water outlet pipe, 430-water inlet pipe assembly, 431-quick plug connector, 432-bellows, 433-tee connector, 434-first main water pipe, 435-second main water pipe, 436-first four-way connector, 437-second four-way connector, 440-water outlet pipe assembly, 450-box water inlet pipe, 460-box water outlet pipe. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figures 1 to 11 As shown, a top liquid-cooled energy storage battery box includes a box body, a battery module, a liquid cooling plate and water inlet and outlet parts; the box body includes a lower box body and a box cover, the top of the lower box body is open, the battery module is fixed in the lower box body, the box cover is covered on the top of the lower box body, and insulating sheets are fixed on the inner side of the bottom surface of the lower box body and the inner side of the box cover; the liquid cooling plate is located at the top of the battery module, the battery module includes a plurality of battery cells and a bus located at the top of the battery cells, the surface of the liquid cooling plate is coated with insulating material, the space between the liquid cooling plate and the bus bar is filled with heat-conductive structural adhesive, the liquid cooling plate is connected to the water inlet and outlet parts, and the water inlet and outlet parts are used for the inlet and outlet of cooling liquid.

[0035] In some embodiments, since the liquid cooling plate is made of aluminum alloy, in order to ensure the safety of the battery box, an insulating varnish is used as an insulating material to be applied to the surface of the liquid cooling plate, and the position where the liquid cooling plate contacts the busbar is filled with a thermal conductive structural adhesive. Generally, the thickness of the insulating varnish is 0.2 mm, and the thickness of the thermal conductive structural adhesive is 1.3 mm. The thickness of the insulating sheet is 0.5 mm.

[0036] In some embodiments, the battery module also includes an end plate and a steel belt. The end plate is provided with a limiter for fixing the steel belt. The steel belt binds the end plate and multiple battery cells tightly and fixes them. The multiple battery cells are arranged in a rectangular array, and the end plate is located at the front and rear ends of the rectangular array; a connector made of insulating material is fixed to the top of the end plate, and the liquid cooling plate is fixed to the connector by bolts.

[0037] In some embodiments, the steel strip is made of stainless steel and is wrapped with a 0.4 mm thick insulating layer. The connector is inserted into the corresponding hole on the end plate, and the connector and the end plate are interference fit. The connector is provided with screw holes that match the bolts for fixing the liquid cooling plate, and the liquid cooling plate is provided with four fixing holes for mounting the bolts. The total positive and negative busbars pass through the middle of the hole on the connector. To ensure insulation performance, the connector is made of plastic material.

[0038] In some embodiments, buffer foam is provided between adjacent battery cells, and buffer foam and insulating sheets are provided between the battery cells and the end plates; the number of end plates at the front and rear ends of the rectangular array is multiple, and inter-module brackets are provided between adjacent end plates, and the inter-module brackets are provided with buckles for fixing the water inlet and outlet parts. There are two buckles on each inter-module bracket, and the thickness of the buffer foam is 3mm. When arranging the battery cells, the upper surfaces of all busbars must be ensured to be on the same horizontal plane, without overlapping or tilting, so as to ensure the uniformity of heat exchange with the liquid cooling plate and facilitate installation and gluing.

[0039] In some embodiments, there are multiple liquid cooling plates, which are arranged in sequence above the busbar at the same height, with gaps between adjacent liquid cooling plates; multiple liquid cooling plates are arranged in parallel. The liquid cooling plates are installed flat, and the width of the gap should be sufficient to ensure that the liquid cooling plates will not block the battery explosion-proof valve directly above, so that the electrolyte can flow out smoothly when the battery valve explodes.

[0040] In some embodiments, the water inlet and outlet components include an inlet pipe assembly, an outlet pipe assembly, a box water inlet pipe, and a box water outlet pipe. The inlet and outlet of the liquid cold plate are respectively connected to the cold plate water inlet pipe and the cold plate water outlet pipe. The cold plate water inlet pipe is connected to the box water inlet pipe through the inlet pipe assembly, and the cold plate water outlet pipe is connected to the box water outlet pipe through the outlet pipe assembly. The box water inlet pipe and the box water outlet pipe are both installed on the box and pass through the box. The box water inlet pipe and the box water outlet pipe are fixed on the corresponding holes of the lower box.

[0041] In some embodiments, the water inlet pipe assembly and the water outlet pipe assembly are composed of a quick-connect connector, a bellows, a first four-way connector, a first main water pipe, a second four-way connector, a second main water pipe and a three-way connector, the three-way connector of the water inlet pipe assembly is connected to the cold plate water inlet pipe, and the three-way connector of the water outlet pipe assembly is connected to the cold plate water outlet pipe. The first main water pipe and the second main water pipe are made of nylon, and the first four-way connector, the second four-way connector and the three-way connector are made of modified plastic.

[0042] In some embodiments, the first main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other, and the second main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other. The first main water pipe of the water outlet pipe assembly is located below the first main water pipe of the water inlet pipe assembly, and the second main water pipe of the water outlet pipe assembly is located below the second main water pipe of the water inlet pipe assembly; the first four-way joint, the second four-way joint, and the three-way joint are all oriented in the same direction.

[0043] In some embodiments, the box water inlet pipe and the box water outlet pipe are connected to an external coolant circulation system. The coolant enters the water inlet pipe assembly from the box water inlet pipe, flows through the corresponding liquid cooling plate through the multiple cold plate water inlet pipes, and then flows out from the cold plate water outlet pipe to the water outlet pipe assembly, and finally flows out from the box water outlet pipe.

[0044] In some embodiments, the liquid cooling plate includes a plugging piece and an extruded cold plate body, the plugging pieces are arranged at both ends of the cold plate body and block the flow channel inside the cold plate body, a water barrier is arranged inside the cold plate body so that the flow channel is U-shaped; two circular through holes are arranged on the liquid cooling plate, and the two circular through holes are respectively connected to the two ends of the flow channel. The water barrier is in the shape of a strip, and there is a chamfer at the boundary of the water barrier to reduce resistance loss. The two circular through holes are respectively opened at the inlet and outlet of the cold plate, and the cold plate water inlet pipe and the cold plate water outlet pipe are respectively connected to the two circular through holes.

[0045] In some embodiments, the outer side of the lower box body is provided with reinforcing ribs and fixing ears, the bottom of the lower box body is provided with two cross beams and four longitudinal beams for supporting the battery module, and the two ends of the longitudinal beams are respectively connected to the two cross beams; the box cover is provided with an explosion-proof valve, and a sealing gasket is provided at the connection between the box cover and the lower box body. The number of reinforcing ribs is four, and the number of fixing ears is two, which are located on both sides of the lower box body to ensure the strength of the battery box and fix the battery box. The end plate is fixed on the cross beam.

[0046] In some embodiments, considering that water vapor in the air may condense on the liquid cooling plate and cause a short circuit, a water-absorbing resin is added to the battery box before the battery box is sealed to reduce the moisture content of the air in the battery box and prevent water vapor from condensing on the liquid cooling plate.

[0047] The assembly process of the above battery box is as follows:

[0048] The first step is to install the battery module into the lower box and fix it with screws. Install the connector and the inter-module bracket on the end plate.

[0049] The second step is to apply glue on the upper surface of the corresponding bus of the battery module, install the liquid cooling plate above the bus, and fix it with bolts, waiting for the thermal conductive structural glue to solidify.

[0050] The third step is to connect the water inlet pipe assembly and the water outlet pipe assembly to the cold plate water inlet pipe and cold plate water outlet pipe of the corresponding liquid cooling plate, and then fix them with the clips on the inter-module bracket.

[0051] The fourth step is to install the water inlet pipe of the box body on the quick connector on the water inlet pipe assembly through the liquid inlet port on the lower box body, and to install the water outlet pipe of the box body on the quick connector on the water outlet pipe assembly through the liquid outlet port.

[0052] The fifth step is to add absorbent resin into the box body, stick the sealing gasket on the lower box body, cover the box cover and seal it.

[0053] The above embodiments are preferred implementation modes of the utility model, but the implementation modes of the utility model are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the utility model should be equivalent replacement methods and are included in the protection scope of the utility model.

Claims

1. A top liquid-cooled energy storage battery box, characterized in that: Including box body, battery module, liquid cooling plate and water inlet and outlet parts; The box body includes a lower box body and a box cover. The top of the lower box body is open, the battery module is fixed in the lower box body, the box cover is covered on the top of the lower box body, and the inner side of the bottom surface of the lower box body and the inner side of the box cover are both fixed with insulating sheets; The liquid cooling plate is located at the top of the battery module. The battery module includes multiple battery cells and a bus located at the top of the battery cells. The surface of the liquid cooling plate is coated with insulating material. The space between the liquid cooling plate and the bus is filled with thermal conductive structural adhesive. The liquid cooling plate is connected to the water inlet and outlet components, which are used to enter and exit the cooling liquid.

2. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: The battery module also includes an end plate and a steel belt. The end plate is provided with a limiter for fixing the steel belt. The steel belt binds and fixes the end plate and a plurality of battery cells. The plurality of battery cells are arranged in a rectangular array. The end plate is located at the front and rear ends of the rectangular array. A connector made of insulating material is fixedly arranged on the top of the end plate, and the liquid cooling plate is fixed on the connector by bolts.

3. A top liquid-cooled energy storage battery box according to claim 2, characterized in that: Buffer foam is provided between adjacent battery cells, and buffer foam and an insulating sheet are provided between the battery cells and the end plates; There are multiple end plates at the front and rear ends of the rectangular array, and inter-module brackets are provided between adjacent end plates. The inter-module brackets are provided with buckles for fixing water inlet and outlet components.

4. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: There are multiple liquid cooling plates, which are arranged in sequence above the bus at the same height, with gaps between adjacent liquid cooling plates; and the multiple liquid cooling plates are arranged in parallel.

5. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: The water inlet and outlet components include an inlet pipe assembly, an outlet pipe assembly, a box water inlet pipe and a box water outlet pipe. The inlet and outlet of the liquid cooling plate are respectively connected with the cold plate water inlet pipe and the cold plate water outlet pipe. The cold plate water inlet pipe is connected to the box water inlet pipe via the inlet pipe assembly, and the cold plate water outlet pipe is connected to the box water outlet pipe via the outlet pipe assembly. The box water inlet pipe and the box water outlet pipe are both installed on the box and pass through the box.

6. A top liquid-cooled energy storage battery box according to claim 5, characterized in that: The water inlet pipe assembly and the water outlet pipe assembly are both composed of a quick-connect connector, a bellows, a first four-way connector, a first main water pipe, a second four-way connector, a second main water pipe and a three-way connector which are connected in sequence. The three-way connector of the water inlet pipe assembly is connected to the cold plate water inlet pipe, and the three-way connector of the water outlet pipe assembly is connected to the cold plate water outlet pipe.

7. A top liquid-cooled energy storage battery box according to claim 6, characterized in that: The first main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other, and the second main water pipes of the water inlet pipe assembly and the water outlet pipe assembly are arranged vertically and parallel to each other.

8. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: The liquid cooling plate includes a sealing piece and an extruded cold plate body. The sealing pieces are arranged at both ends of the cold plate body and seal the flow channel inside the cold plate body. A water-blocking wall is arranged inside the cold plate body so that the flow channel is U-shaped. Two circular through holes are arranged on the liquid cooling plate, and the two circular through holes are respectively connected to the two ends of the flow channel.

9. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: The outer side of the lower box body is provided with reinforcing ribs and fixing ears. The bottom of the lower box body is provided with two cross beams and four longitudinal beams for supporting the battery module. The two ends of the longitudinal beams are respectively connected to the two cross beams; an explosion-proof valve is provided on the box cover, and a sealing gasket is provided at the connection between the box cover and the lower box body.

10. A top liquid-cooled energy storage battery box according to claim 1, characterized in that: The insulating material is insulating varnish with a thickness of 0.2 mm, and the thickness of the insulating sheet is 0.5 mm.

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