Battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack and electric equipment. The battery pack specifically comprises a battery box body and a battery cell stack, wherein the battery box body is provided with a mounting cavity; the battery cell pile is arranged in the mounting cavity and comprises a plurality of battery cell monomers which are stacked in the first direction, each battery cell monomer comprises a convex part at the top and a groove part, an anti-explosion valve is arranged on the top wall of each convex part, and a battery cell pole is arranged on the bottom wall in each groove part; wherein the battery box body is internally provided with a pressure relief channel extending along a first direction, and the pressure relief channel is arranged opposite to the anti-explosion valve, so that the pressure relief channel can receive thermal runaway products discharged by the anti-explosion valve. According to the battery pack, the use safety of the battery pack can be improved, electric connection parts of the battery cell monomers cannot be damaged during thermal runaway, the space utilization rate of the battery pack is improved, and the energy density is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack and electrical equipment. BACKGROUND

[0002] At present, new energy vehicles are more and more concerned by society, and the events such as self-ignition and collision combustion of electric vehicles have attracted people's attention, and more stringent requirements are put forward for the thermal management and thermal protection of battery pack. Recently, with the release and application of 4C batteries of major companies, the demand for fast charging of batteries in the market is increasing, and 4C or even 6C fast charging means that the overcurrent capacity of the battery is more challenging. On the other hand, the cost of electric vehicles is widely concerned by host manufacturers, battery manufacturers and consumers, and the battery pack accounts for a high proportion of the cost of electric vehicles. The reduction of battery pack cost plays an extremely important role in reducing the cost of the whole vehicle.

[0003] In the prior art, the traditional battery pack is not directional in the design of the cell pressure relief exhaust channel when thermal runaway occurs, which can cause some exhaust to the high-voltage arrangement space of the battery, easily leading to secondary thermal runaway due to high-voltage arc. At the same time, as the battery charge and discharge rate increases, the high-voltage overcurrent requirement is higher and higher, and the traditional cell structure has small busbar arrangement space, which is difficult to meet the large overcurrent area demand generated by greater fast charging demand. And the traditional square shell cell pole and cover plate structure design makes the Z-direction space occupation large in the module design.

[0004] Therefore, it is urgent to provide a new type of battery pack and electrical equipment to solve the above technical problems in the prior art. INVENTION CONTENTS

[0005] One purpose of the utility model is to provide a battery pack that can improve the use safety of the battery pack, will not damage the electrical connection components of the cell when thermal runaway occurs, and improve the space utilization of the battery pack, which helps to improve the energy density.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery pack specifically includes a battery box and a cell stack, the battery box has a mounting cavity, the cell stack is arranged in the mounting cavity and includes a plurality of cell monomers arranged in a first direction, the cell monomer includes a protruding part and a groove part at the top, the top wall of the protruding part is provided with an explosion-proof valve, and the inner bottom wall of the groove part is provided with a cell pole; wherein, the battery box is internally provided with a pressure relief channel extending in the first direction, and the pressure relief channel is arranged opposite to the explosion-proof valve, so that the pressure relief channel can receive the thermal runaway products discharged by the explosion-proof valve.

[0008] Optionally, the battery box comprises a top cover plate, the top cover plate is provided with a pressure relief protrusion, and an inner wall of the pressure relief protrusion and a top wall of the protruding portion form the pressure relief channel.

[0009] Optionally, a width of the pressure relief protrusion along a second direction is not greater than a width of the protruding portion along the second direction, and the second direction is perpendicular to the first direction.

[0010] Optionally, the pressure relief protrusion is provided with a pressure relief valve.

[0011] Optionally, a sealing gasket is arranged between a top wall of the cell stack and the top cover plate, and the sealing gasket is provided with a relief hole for avoiding the explosion-proof valve and the cell pole.

[0012] Optionally, the cell pole comprises a positive pole and a negative pole, the recessed portion is provided with two recessed portions, the two recessed portions are arranged on both sides of the protruding portion respectively, one of the two recessed portions is provided with the positive pole, and the other is provided with the negative pole.

[0013] Optionally, the cell stack further comprises two CCS assemblies, the CCS assemblies are accommodated in the recessed portion, one of the two CCS assemblies is connected to the positive pole, and the other is connected to the negative pole.

[0014] Optionally, the battery box comprises a lower box body, and connectors of the CCS assemblies are fixed to a cross beam of the lower box body through connecting pieces.

[0015] Optionally, the pressure relief channel is provided with a plurality of pressure relief channels corresponding to the cell stacks respectively, and the plurality of cell stacks are arranged in a stacking mode along a second direction, and the second direction is perpendicular to the first direction.

[0016] Another purpose of the utility model is to provide a kind of electric equipment, and the electric equipment comprises the battery pack as described in any of the above schemes.

[0017] Beneficial effects:

[0018] The battery pack in the embodiment uses the mounting cavity of the battery box to accommodate the cell stack, the cell stack is composed of a plurality of cell monomers stacked in a first direction, the top of the cell monomer comprises a protruding part and a groove part, the protruding part is provided with an explosion-proof valve and the groove part is provided with a cell pole, so as to separate the explosion-proof valve and the cell pole, when the cell monomer appears thermal runaway, the thermal runaway product discharged by the explosion-proof valve is directly discharged from the pressure relief channel in the battery box, and does not pass through the cell pole of the cell monomer, so as to not affect the overcurrent component of the cell stack, which is not only beneficial to the rapid pressure relief and exhaust of the thermal runaway cell monomer, but also can avoid the generation of high-pressure arc phenomenon caused by high-temperature burning of the cell pole, and improves the safety performance; meanwhile, since the cell pole is arranged in the groove part of the cell monomer, the cell pole does not occupy too large height space in the battery pack, which is helpful to improve the space utilization rate and energy density in the battery pack. The battery pack can improve the use safety of the battery pack, does not damage the electrical connection component of the cell monomer when thermal runaway, and improves the space utilization rate of the battery pack, which is helpful to improve the energy density. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the axonometric view of the cell monomer provided in the specific embodiment of the utility model;

[0020] Figure 2 is the axonometric view of the battery pack provided in the specific embodiment of the utility model;

[0021] Figure 3 is the sectional view of the battery pack provided in the specific embodiment of the utility model;

[0022] Figure 4 is the axonometric view of the partial structure of the battery pack provided in the specific embodiment of the utility model;

[0023] Figure 5 is the explosion view of the battery pack provided in the specific embodiment of the utility model.

[0024] In the drawings:

[0025] 100, battery box; 101, pressure relief channel; 110, top cover plate; 111, pressure relief protrusion; 112, pressure relief valve; 120, lower box; 121, liquid cooling plate; 122, cross beam; 130, sealing gasket; 131, avoiding hole;

[0026] 200, cell monomer; 201, cell stack; 210, protruding part; 220, groove part; 230, explosion-proof valve; 240, cell pole; 241, positive pole; 242, negative pole; 250, CCS assembly; 251, nickel connecting sheet; 252, connector. DETAILED DESCRIPTION

[0027] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0028] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0031] The first direction described in the embodiment is the X direction shown in Figures 1 to 3 , that is, the thickness direction of the battery cell 200; the second direction is the Y direction shown in Figures 1 to 3 , that is, the length direction of the battery cell 200, and the first direction is perpendicular to the second direction.

[0032] As shown in Figures 1 to 3As shown, the battery pack specifically comprises a battery box 100 and a cell stack 201, the battery box 100 has a mounting cavity; the cell stack 201 is arranged in the mounting cavity and comprises a plurality of cell monomers 200 arranged in a stack along a first direction, the cell monomer 200 comprises a protruding portion 210 and a groove portion 220 at the top, the top wall of the protruding portion 210 is provided with an explosion-proof valve 230, and the inner bottom wall of the groove portion 220 is provided with a cell pole 240; wherein the battery box 100 is internally provided with a pressure relief channel 101 extending along the first direction, and the pressure relief channel 101 is arranged opposite to the explosion-proof valve 230, so that the pressure relief channel 101 can receive the thermal runaway products discharged by the explosion-proof valve 230.

[0033] The battery pack in the embodiment uses the mounting cavity of the battery box 100 to accommodate the cell stack 201, which is composed of a plurality of cell monomers 200 arranged in a stack along a first direction, the top of the cell monomer 200 comprises a protruding portion 210 and a groove portion 220, the protruding portion 210 is provided with an explosion-proof valve 230 and the groove portion 220 is provided with a cell pole 240, so as to separate the explosion-proof valve 230 and the cell pole 240, when the cell monomer 200 appears thermal runaway, the thermal runaway products discharged by the explosion-proof valve 230 are directly discharged from the pressure relief channel 101 inside the battery box 100 corresponding to the explosion-proof valve 230, without passing through the cell pole 240 of the cell monomer 200, so as not to affect the overcurrent components of the cell stack 201, which not only facilitates the rapid pressure relief and exhaust of the thermal runaway cell monomer 200, but also avoids the generation of high-pressure arc phenomenon caused by high-temperature burning of the cell pole 240, thereby improving the safety performance; at the same time, since the cell pole 240 is arranged in the groove portion 220 of the cell monomer 200, the cell pole 240 will not occupy too much height space in the battery pack, which helps to improve the space utilization rate and energy density in the battery pack. The battery pack can improve the safety of the battery pack, and will not damage the electrical connection components of the cell monomer 200 when thermal runaway occurs, and the space utilization rate of the battery pack is improved, which helps to improve the energy density.

[0034] Further, the battery box 100 comprises a top cover plate 110, the top cover plate 110 is provided with a pressure relief protrusion 111, and the pressure relief channel 101 is formed between the inner wall of the pressure relief protrusion 111 and the top wall of the protruding portion 210. The pressure relief protrusion 111 is arranged on the top cover plate 110, so that the pressure relief channel 101 is formed between the inner wall of the pressure relief protrusion 111 and the top wall of the protruding portion 210 for pressure relief, which can realize pressure relief from the top of the cell monomer 200, and the pressure relief channel 101 is formed by the top cover plate 110, which can reduce the parts of the battery box 100 and facilitate processing and molding.

[0035] In the embodiment, the width of the pressure relief protrusion 111 along the second direction is not greater than the width of the protrusion portion 210 along the second direction, and the second direction is perpendicular to the first direction. In this way, the width of the pressure relief channel 101 formed by the pressure relief protrusion 111 does not exceed the protrusion portion 210, so as not to be connected with the space of the groove portion 220, avoiding the high-temperature and high-pressure gas in the pressure relief channel 101 affecting the cell pole 240, and further improving the safety.

[0036] Specifically, the pressure relief protrusion 111 is provided with a pressure relief valve 112. The pressure relief valve 112 can realize the pressure relief function when the pressure of the high-temperature gas in the pressure relief channel 101 is too large, avoiding affecting other cell monomers 200 and avoiding heat diffusion, and further improving the safety performance.

[0037] As shown in Figure 4 and Figure 5 , the top wall of the cell stack 201 and the top cover plate 110 are clamped with a sealing gasket 130, and the sealing gasket 130 is provided with a relief hole 131 avoiding the explosion-proof valve 230 and the cell pole 240. The sealing gasket 130 can realize the sealing between the pressure relief protrusion 111 and the cell stack 201, so as to avoid the high-temperature and high-pressure gas generated when the cell monomer 200 is out of control from diffusing to other cell monomers 200 along the gap between the top cover plate 110 and the cell stack 201, and the setting of the relief hole 131 will not affect the normal pressure relief of the explosion-proof valve 230 of the cell monomer 200, further improving the safety performance.

[0038] Optionally, the cell pole 240 includes a positive pole 241 and a negative pole 242, and the groove portion 220 is provided with two, and the two groove portions 220 are respectively arranged on both sides of the protrusion portion 210, and one of the two groove portions 220 is provided with the positive pole 241, and the other is provided with the negative pole 242. It should be noted that the groove portion 220 can also be provided with one, and the positive pole 241 and the negative pole 242 can be located in the same groove portion 220, as long as the height difference between the cell pole 240 and the explosion-proof valve 230 is generated, so that the pressure relief exhaust of the explosion-proof valve 230 will not affect the cell pole 240. The positive pole 241 and the negative pole 242 are arranged on both sides of the protrusion portion 210, which is helpful to facilitate the separate installation of the positive pole 241 and the negative pole 242, improve the production efficiency, and reduce the production difficulty, which will not be described here.

[0039] Please continue to refer to Figure 4 and Figure 5The cell stack 201 further comprises two CCS assemblies 250 (Cells Contact System) accommodated in the recessed portion 220, one of the two CCS assemblies 250 being connected to the positive pole 241 and the other being connected to the negative pole 242. Specifically, the CCS assembly 250 comprises a nickel connecting sheet 251 welded to the positive pole 241 or the negative pole 242 and a FPC (Flexible Printed Circuit) for collecting current and connecting to a battery management system, so as to collect parameters of the cell monomer 200 and facilitate management of the battery.

[0040] In the embodiment, the battery box 100 comprises a lower box 120, and the connector 252 of the CCS assembly 250 is fixed to the crossbeam 122 of the lower box 120 through a connecting member. Specifically, the connector 252 of the CCS assembly 250 is fixed to the crossbeam 122 through an expanding rivet, a bolt or an adhesive sheet, so that the structure of the connecting bracket can be omitted, the shape and structure are simpler, and the production cost is reduced.

[0041] It should be noted that the liquid cooling plate 121 in the lower box 120 is fixed to the lower box 120 by rivets or welding, and the cell stack 201 is provided with buffer foam at both ends in the first direction, so as to play a buffering and damping role between the crossbeam 122 and further improve the safety, which will not be described here.

[0042] Optionally, the pressure relief channel 101 is provided in plurality one-to-one corresponding to the cell stack 201, and the plurality of cell stacks 201 are stacked in a second direction, and the second direction is perpendicular to the first direction. Thus, the high-temperature and high-pressure gas of each cell stack 201 can be discharged through the respective pressure relief channel 101, avoiding affecting the adjacent cell stack 201, so as to prevent the occurrence of heat diffusion phenomenon, and further improve the safety.

[0043] The height z of the recessed portion 220 of the cell monomer 200 is composed of the height a of the cell pole 240, the thickness b of the nickel connecting sheet 251, the height c of the FPC, the gap d from the FPC to the insulating protective upper cover, the height e of the insulating protective upper cover and the like, and z=a+b+c+d+e can be obtained after the determination of the size chains.

[0044] The embodiment also provides a power utilization device including the battery pack according to any one of the preceding solutions. The power utilization device includes the single battery cell according to the preceding solution. The power utilization device can be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as electric energy is used as an energy source, which is not described here again. When the battery pack is used, the power utilization device can directly discharge the thermal runaway products discharged by the explosion-proof valve 230 from the pressure relief channel 101 inside the battery box 100 corresponding to the explosion-proof valve 230 when the battery cell monomer 200 appears thermal runaway, which is not only beneficial to the rapid pressure relief and exhaust of the thermal runaway battery cell monomer 200, but also can avoid the generation of the high-voltage arc phenomenon caused by the high-temperature burn of the battery cell pole 240, and improves the safety performance. At the same time, since the battery cell pole 240 is arranged in the groove part 220 of the battery cell monomer 200, the battery cell pole 240 does not occupy too large height space in the battery pack, which is helpful to improve the space utilization and energy density in the battery pack, and improves the endurance performance of the power utilization device.

[0045] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery pack, characterized in that, include: A battery housing (100) having a mounting cavity; A battery cell stack (201) is disposed in the mounting cavity and includes a plurality of battery cell units (200) stacked along a first direction. Each battery cell unit (200) includes a protrusion (210) and a groove (220) at the top. An explosion-proof valve (230) is provided on the top wall of the protrusion (210), and a battery cell terminal (240) is provided on the inner bottom wall of the groove (220). The battery housing (100) is provided with a pressure relief channel (101) extending in a first direction. The pressure relief channel (101) is positioned opposite the explosion-proof valve (230) so that the pressure relief channel (101) can receive the thermal runaway products discharged by the explosion-proof valve (230).

2. The battery pack according to claim 1, characterized in that, The battery housing (100) includes a top cover plate (110), the top cover plate (110) is provided with a pressure relief protrusion (111), and a pressure relief channel (101) is formed between the inner wall of the pressure relief protrusion (111) and the top wall of the protrusion (210).

3. The battery pack according to claim 2, characterized in that, The width of the pressure relief protrusion (111) along the second direction is not greater than the width of the protrusion (210) along the second direction, and the second direction is perpendicular to the first direction.

4. The battery pack according to claim 2, characterized in that, The pressure relief protrusion (111) is equipped with a pressure relief valve (112).

5. The battery pack according to claim 2, characterized in that, A sealing gasket (130) is sandwiched between the top wall of the battery cell stack (201) and the top cover plate (110). The sealing gasket (130) is provided with a clearance hole (131) to avoid the explosion-proof valve (230) and the battery cell terminal (240).

6. The battery pack according to claim 1, characterized in that, The battery cell terminals (240) include a positive terminal (241) and a negative terminal (242). There are two grooves (220), which are respectively located on both sides of the protrusion (210). One of the two grooves (220) is provided with the positive terminal (241), and the other is provided with the negative terminal (242).

7. The battery pack according to claim 6, characterized in that, The cell stack (201) also includes two CCS components (250), which are housed in the recess (220). One of the two CCS components (250) is connected to the positive terminal (241), and the other is connected to the negative terminal (242).

8. The battery pack according to claim 7, characterized in that, The battery housing (100) includes a lower housing (120), and the connector (252) of the CCS assembly (250) is fixed to the crossbeam (122) of the lower housing (120) by a connector.

9. The battery pack according to any one of claims 1-8, characterized in that, Multiple pressure relief channels (101) are provided in a one-to-one correspondence with the battery cell stacks (201), and the multiple battery cell stacks (201) are stacked along a second direction, which is perpendicular to the first direction.

10. Electrical equipment, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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