Lithium battery with built-in counter weight

Abstract

A lithium battery with a built-in counter weight comprises a battery box body, a bottom-edge-free cavity structure is arranged below a bottom plate of the battery box body, and the counter weight is arranged in a cavity and fixed through a connecting piece on the side wall of the cavity; a battery main body is arranged in the battery box body, and a box cover assembly is arranged above the battery main body to cover the top of the battery box body. The balancing weight supports the battery box body and is stable in structure and convenient to install, the balancing weight is arranged in the battery box body, processing operation of surface treatment of the battery box is not affected, the balancing weight and a battery body can be separately produced and tested, and the whole production process is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a lithium battery with built-in counterweight. BACKGROUND

[0002] In a conventional system for a material handling vehicle such as a forklift, a lead-acid battery is often used as an energy source. The lead-acid battery is generally heavy, and thus there is generally no need to add weight to the related system to properly balance the vehicle for different operations. However, the lead-acid battery still has many defects, for example: low energy density, high self-discharge rate, resulting in low energy storage efficiency; short service life, about two years need to be replaced with new products; the aforementioned electrolyte contains heavy metals, which is not suitable for landfill or incineration treatment; heavy weight, 65 ampere hours (Ah) of electric capacity, about 15 to 20 kilograms in weight, which will cause more fuel consumption of the automobile when applied to the automobile. Due to the above-mentioned shortcomings, the lead-acid battery is gradually replaced by lithium batteries. The overall weight of the lithium battery is lighter, and thus additional counterweight needs to be added to the battery.

[0003] The prior art patent application with the application publication number CN112002840A discloses a battery box with counterweight, which comprises an outer box, an inner box, at least one counterweight and a lithium battery pack. The outer box has a containing space, the inner box has a first space and is arranged in the containing space of the outer box to form at least one second space, the at least one counterweight is contained in the at least one second space, and the lithium battery pack is arranged in the first space of the inner box and comprises a plurality of lithium battery cells connected with each other in an electrical manner. By placing the inner box and the counterweights in the containing space of the outer box, the carrying vehicle can provide power with the lithium battery, and the whole vehicle still has a balanced weight configuration to stabilize the driving performance of the carrying vehicle. SUMMARY

[0004] The lead-acid battery of the forklift needs to be replaced by the lithium battery with counterweight to ensure that the self-weight of the forklift remains unchanged after the replacement of the lead-acid battery with the lithium battery. The existing lithium battery with counterweight is mostly in two forms: external configuration connected to the box body in the form of assembly; or internal counterweight connected to the box body in the form of welding.

[0005] The external configuration connected to the box body in the form of assembly will affect the surface treatment of the battery box, such as electrophoresis and plastic spraying processing. At the same time, the excessive counterweight cannot be subjected to partial surface treatment, and can only be painted, which has poor surface treatment effect and is not aesthetic.

[0006] The counterweight is built-in and connected to the box in the form of welding. In production, the counterweight is too heavy to be lifted and operated, and the production process is complex. At the same time, the surface treatment is affected, the whole battery box is heavy, and the box can only be treated by spraying or painting. Or the box is first electroplated and sprayed, the built-in counterweight is divided and electroplated, and then the counterweight is welded and built-in after the outer box is returned. The operation is troublesome, and the production process is complicated. In assembly and circulation, the large battery box can only be used in the ground, which cannot meet the needs of mass production. And in the project cycle: the production cycle of the counterweight is slow, and the counterweight welding built-in scheme needs to wait for the completion of the counterweight production before proceeding to the next step, which seriously affects the production process.

[0007] To solve the above problems, the technical scheme provided by the utility model is: a lithium battery with built-in counterweight, comprising a battery box, a bottom plate of the battery box is provided with a bottomless cavity structure, a counterweight block is placed in the cavity and fixed through a connecting piece on the side wall of the cavity; a battery main body is arranged in the battery box, and a box cover assembly is arranged above the battery main body to cover the top of the battery box.

[0008] The counterweight is fixed in the cavity below the bottom plate of the battery box and supported by the counterweight block, instead of the flange below the battery box supporting the whole weight, which ensures the stable structure and facilitates installation, only needs to fix the battery box above the counterweight through the waist hole. At the same time, the counterweight is in the battery box, which does not affect the processing operation of the surface treatment of the battery box, and can be produced and tested separately with the battery main body, without affecting the overall production process.

[0009] Specifically, the battery main body comprises a battery module and an electric board connected thereto, and the electric board is provided with a battery management system assembly module.

[0010] Specifically, a module support is arranged in the battery box, the module support is fixed on the bottom plate of the battery box, and the battery module is fixed on the module support.

[0011] Specifically, an electric board support is arranged on the inner side wall of the battery box, and the electric board is fixed on the electric board support.

[0012] Specifically, a sealing strip is arranged on the side wall of the battery box, a strip-shaped protruding fixing edge is arranged on one of the sealing strips, and a wire harness hole is arranged on the fixing edge.

[0013] Specifically, a wire harness assembly component is arranged on the fixing edge, and a wire harness is connected to the internal circuit of the battery box through the wire harness hole below the wire harness assembly component.

[0014] Specifically, the box cover assembly covers the sealing strip on the side wall of the battery box body, and the box cover assembly leaves corresponding strip-shaped gaps at the fixed edge; the box cover assembly is provided with a wire clamp and a charging seat base, the wire harness assembly is fixed on the wire clamp, and the wire harness is connected with the charging seat arranged on the charging seat base.

[0015] Specifically, the connecting plate strip protruding beyond the box cover assembly is arranged above the side wall of the battery box body.

[0016] The utility model discloses the beneficial effect is: the integrated design of built-in counterweight, stable structure, convenient installation, do not affect the machining operation of battery box surface treatment, and can produce test separately with battery main body, do not affect the overall production process, speed up the batch production progress. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall explosion map of the utility model.

[0018] Figure 2 It is the battery box body structure diagram of the utility model.

[0019] Figure 3 It is the box body and counterweight block connection schematic view of the utility model.

[0020] In the drawing, 1, wire harness assembly, 2, box cover assembly, 3, electric board, 4, battery management system assembly module, 5, battery module, 6, battery box body, 7, counterweight block, 8, wire clamp, 9, waist hole, 10, charging seat base, 11, sealing strip, 12, electric board support, 13, module support, 14, wire harness hole, 15, connecting plate strip, 16, connecting hole, 17, reinforcing rib, 18, fixed rib. DETAILED DESCRIPTION

[0021] The utility model will be described in detail in combination with the drawings and examples.

[0022] The lead-acid battery of the forklift needs to be equipped with a counterweight to ensure that the self-weight of the forklift remains the same after the lead-acid battery is replaced by a lithium battery. The existing lithium battery with a counterweight mostly adopts two forms: an external configuration, which is connected to the box body in the form of assembly; or an internal counterweight, which is connected to the box body in the form of welding.

[0023] The form of the configuration outside, in the form of assembly connection box, has the following disadvantages: the whole battery box surface treatment: need to go through electrophoresis, box repair, spray plastic and a series of processes. The general electrophoresis line can hang less than 200kg, so the counterweight surface can only be treated with paint. This has a great color difference from the box through electrophoresis and spray, and the quality cannot be effectively guaranteed. At the same time, in the welding process, there will be many surface defects, such as: undercut, arc pit not filled, burning through and poor forming, etc. This will greatly affect the appearance and geometric state of the weld.

[0024] The form of the configuration outside, in the form of assembly connection box, has the following disadvantages: the whole battery box surface treatment: need to go through electrophoresis, box repair, spray plastic and a series of processes. The general electrophoresis line can hang less than 200kg, so the counterweight surface can only be treated with paint. This has a great color difference from the box through electrophoresis and spray, and the quality cannot be effectively guaranteed. At the same time, in the welding process, there will be many surface defects, such as: undercut, arc pit not filled, burning through and poor forming, etc. This will greatly affect the appearance and geometric state of the weld.

[0025] Therefore, a new type of design is needed, which is a lithium battery with counterweight built-in and does not affect the production process.

[0026] Embodiment one: a lithium battery with counterweight built-in, comprising a battery box 6, a bottom plate below the battery box 6 is provided with a bottomless cavity structure, a counterweight block 7 is placed in the cavity and fixed through the connecting piece on the cavity side wall; the battery box 6 is internally provided with a battery main body, and a box cover assembly 2 is arranged above the battery main body to cover the top of the battery box 6.

[0027] Lithium batteries have higher energy density, and can release or store more electrical energy in the same volume or weight. This makes lithium batteries an ideal choice for electric vehicles and other devices that require high-capacity batteries, which can extend the range of the device. However, lithium batteries are much lighter than lead-acid batteries, and in order to ensure that the overall weight of the forklift does not change, additional counterweights need to be added. The counterweights are built into the cavity below the bottom plate of the battery box 6, and are supported by the counterweight blocks 7, which support the weight of the entire battery pack, rather than the flange below the battery box, ensuring a stable structure and easy installation, which only requires the battery box 6 to be fixed above the counterweight through the waist hole 9. At the same time, the counterweight is inside the battery box 6, which does not affect the machining operation of the surface treatment of the battery box, and can be produced and tested separately from the battery body, without affecting the overall production process.

[0028] Specifically, the battery box 6 is provided with a module support 13 inside, the module support 13 is fixed on the bottom plate of the battery box 6, and the battery module 5 is fixed on the module support 13. Through the fixation of the module support 13, the battery module 5 can be stabilized in the battery box 6 during transportation and use of the final product.

[0029] Specifically, the battery box 6 is provided with an electrical board support 12 on the inner side wall, and the electrical board 3 is fixed on the electrical board support 12. The electrical board 3 integrates battery drive and circuit components, and needs additional fixation of the electrical board support 12, while being not fixed together with the battery module 5 to facilitate wiring of the wiring harness.

[0030] Specifically, the battery box 6 is provided with a sealing strip 11 on the side wall, and a protruding fixed edge is provided on one of the sealing strips 11, and a wiring harness hole 14 is provided on the fixed edge.

[0031] Specifically, the fixed edge is provided with a wiring harness assembly component 1, and the wiring harness assembly component 1 is connected to the internal circuit of the battery box 6 through the wiring harness hole 14 below. The wiring harness hole 14 facilitates the wiring of the internal circuit of the battery to the cover outside the box, ensuring that the structure is beautiful and the circuit is clear, facilitating maintenance and troubleshooting.

[0032] Specifically, the cover assembly 2 covers the sealing strip 11 on the side wall of the battery box 6, and the cover assembly 2 leaves a corresponding strip-shaped gap on the fixed edge; the cover assembly 2 is provided with a wire clamp 8 and a charging seat base 10, the wiring of the wiring harness assembly component 1 is fixed on the wire clamp 8, and the wiring is connected to the charging seat provided on the charging seat base 10. The design of the wire clamp 8 for fixing the wiring facilitates the installation of the battery and the maintenance and troubleshooting of the circuit.

[0033] Embodiment two: a lithium battery with built-in counterweight, including a battery box 6, a bottomless cavity structure is arranged below the bottom plate of the battery box 6, a counterweight 7 is arranged in the cavity and fixed through the connecting piece on the side wall of the cavity; a battery main body is arranged inside the battery box 6, and a box cover assembly 2 is arranged above the battery main body to cover the top of the battery box 6.

[0034] The energy density of lithium batteries is higher, and more electric energy can be released or stored under the same volume or weight. This makes lithium batteries the ideal choice for electric vehicles and other devices that require large-capacity batteries, which can extend the mileage of the device. However, lithium batteries are much lighter than lead-acid batteries, so additional counterweights are needed to ensure that the overall weight of the forklift does not change. The counterweight is fixed in the cavity below the bottom plate of the battery box 6, supporting the weight of the entire battery pack with the counterweight 7 instead of the flange below the battery box, ensuring a stable structure and easy installation, which only needs to be fixed through the waist hole 9 above the counterweight. At the same time, the counterweight is inside the battery box 6, which does not affect the machining operation of the surface treatment of the battery box, and can be produced and tested separately from the battery main body, without affecting the overall production process.

[0035] Specifically, the battery main body includes a battery module 5 and an electrical board 3 connected thereto, and the electrical board 3 is provided with a battery management system assembly module 4. The battery management system (BMS) is a very important system, which is used to monitor the state of the battery, ensure the safe operation of the battery, and optimize the use efficiency of the battery. Specifically, the BMS can monitor the voltage, current, temperature and other key parameters of the battery, predict the remaining life of the battery, prevent the occurrence of overcharging, overdischarging, overheating and other problems of the battery, and also optimize the charging and discharging strategy of the battery through algorithm to prolong the service life of the battery.

[0036] Specifically, the battery box 6 is provided with a module support 13 inside, the module support 13 is fixed on the bottom plate of the battery box 6, and the battery module 5 is fixed on the module support 13. Through the fixation of the module support 13, the battery module 5 can be stabilized in the battery box 6 during transportation and use of the final product.

[0037] Specifically, the battery box 6 is provided with an electrical board support 12 on the inner side wall, and the electrical board 3 is fixed on the electrical board support 12. The electrical board 3 integrates battery drive and circuit components, which need additional fixation of the electrical board support 12, and can be conveniently wired with the battery module 5.

[0038] Specifically, the battery box 6 is provided with a sealing strip 11 on the side wall, a strip-shaped protruding fixing edge is arranged on one of the sealing strips 11, and a wire harness hole 14 is arranged on the fixing edge.

[0039] Specifically, the fixed edge is provided with a wire harness assembly component 1, and the wire harness assembly component 1 is connected to the internal circuit of the battery box body 6 through a wire harness hole 14. The wire harness hole 14 facilitates the internal circuit of the battery to pass out to the box cover outside the box body, ensuring the structure is beautiful, the circuit is clear, and maintenance and troubleshooting are convenient.

[0040] Specifically, the box cover assembly 2 covers the sealing strip 11 on the side wall of the battery box body 6, and the box cover assembly 2 leaves a corresponding strip-shaped gap at the fixed edge. The box cover assembly 2 is provided with a wire clamp 8 and a charging seat base 10, the wire harness of the wire harness assembly component 1 is fixed on the wire clamp 8, and the wire harness is connected with the charging seat provided on the charging seat base 10. The design of the wire clamp 8 fixing the wire harness facilitates the installation of the battery connection and the maintenance and troubleshooting of the circuit.

[0041] Embodiment three: a lithium battery with a built-in counterweight, including a battery box body 6, a bottom plate of the battery box body 6 is provided with a bottomless cavity structure, a counterweight 7 is placed in the cavity and fixed through a connecting piece on the side wall of the cavity; the battery box body 6 is internally provided with a battery main body, and the battery main body is provided with a box cover assembly 2 covering the top of the battery box body 6. The connecting piece on the side wall of the cavity includes a reinforcing rib 17 and a fixed rib 18 with a waist hole 9, the counterweight 7 is connected and fixed through a bolt fixing structure and the fixed rib 18 with the waist hole 9, and the reinforcing rib 17 ensures the structural stability of the side wall of the battery box body 6. The outside of the bolt fixing structure is provided with a rubber cover, which ensures the appearance is beautiful and prevents the bolt from rusting.

[0042] The counterweight is fixed in the cavity below the bottom plate of the battery box body 6, and supports the weight of the entire battery pack, instead of the flange below the battery box supporting the entire weight, ensuring the structural stability, and facilitating installation, which only needs to fix the battery box body 6 above the counterweight through the waist hole 9. At the same time, the counterweight is inside the battery box body 6, which does not affect the machining operation of the surface treatment of the battery box, and can be produced and tested separately from the battery main body, without affecting the overall production process.

[0043] Specifically, the battery main body includes a battery module 5 and an electrical board 3 connected thereto, and the electrical board 3 is provided with a battery management system assembly module 4. The battery management system (BMS) is a very important system, which is used to monitor the state of the battery, ensure the safe operation of the battery, and optimize the use efficiency of the battery. Specifically, the BMS can monitor the voltage, current, temperature and other key parameters of the battery, predict the remaining life of the battery, prevent the occurrence of problems such as overcharging, overdischarging and overheating of the battery, and also can optimize the charging and discharging strategy of the battery through algorithm, prolong the service life of the battery.

[0044] Specifically, the battery box 6 is internally provided with a module support 13, the module support 13 is fixed on the bottom plate of the battery box 6, and the battery module 5 is fixed on the module support 13. Through the fixation of the module support 13, the battery module 5 can be stabilized in the battery box 6 during transportation and final product use.

[0045] Specifically, the battery box 6 is internally provided with an electrical board support 12 on the side wall, and the electrical board 3 is fixed on the electrical board support 12. The electrical board 3 integrates battery driving and circuit components, and needs the additional fixation of the electrical board support 12, and is not fixed together with the battery module 5 to facilitate wiring.

[0046] Specifically, the battery box 6 is provided with a sealing strip 11 on the side wall, and a protruding fixed edge is arranged on one of the sealing strips 11, and a wire harness hole 14 is arranged on the fixed edge.

[0047] Specifically, the fixed edge is provided with a wire harness assembly component 1, and the wire harness assembly component 1 is connected to the internal circuit of the battery box 6 through the wire harness hole 14 below. The wire harness hole 14 facilitates the wire harness of the battery to pass out to the box cover outside the box, ensures the structure is beautiful, the circuit is clear, and facilitates maintenance and troubleshooting.

[0048] Specifically, the box cover assembly 2 covers the sealing strip 11 on the side wall of the battery box 6, and the box cover assembly 2 leaves a corresponding strip-shaped gap on the fixed edge; the box cover assembly 2 is provided with a wire clamp 8 and a charging seat base 10, the wire harness of the wire harness assembly component 1 is fixed on the wire clamp 8, and the wire harness is connected with the charging seat arranged on the charging seat base 10. The design of the wire clamp 8 for fixing the wire harness facilitates the installation of the battery and the maintenance and troubleshooting of the circuit.

[0049] Specifically, the battery box 6 is provided with a connecting plate strip 15 protruding above the side walls on the opposite sides, the connecting plate strip 15 is provided with a connecting hole 16. The connecting hole 16 can be used for lifting and other operations in the production process, facilitating overall installation and surface treatment such as electrophoresis, and can also be used for installation and fixation in forklift and other use scenarios.

[0050] In the specific production and installation process, the counterweight 7 and the battery box 6 can be produced separately, the battery box 6 can be assembled, tested, and surface treated independently, and the two do not interfere with each other, and when installed, only the battery box 6 needs to be fixed above the counterweight 7, without the need for complicated operations such as lifting the counterweight 7. Through the connecting hole 16 on the connecting plate strip 15, the box can be easily assembled and surface treated.

[0051] The above specific embodiments are only the preferred embodiments of the utility model, and do not limit the specific implementation structure and implementation range of the utility model. In fact, some equivalent changes can also be made according to the shape, structure and design purpose of the utility model. Therefore, any equivalent changes made according to the shape, structure and design purpose of the utility model should be included in the protection scope of the utility model, that is, these equivalent changes should be protected by the utility model.

Claims

1. A lithium battery with built-in counterweight, characterized in that, The battery box body is provided with a bottomless cavity structure below the bottom plate, and the counterweight is arranged in the cavity and fixed through the connecting member on the cavity side wall; the battery box body is internally provided with a battery main body, and the battery main body is provided with a box cover assembly covering the top of the battery box body.

2. The lithium battery with built-in counterweight according to claim 1, characterized in that, The connecting member on the cavity side wall comprises a reinforcing rib and a fixed rib with a waist hole.

3. The lithium battery with built-in counterweight according to claim 1, wherein, The battery main body comprises a battery module and an electric appliance plate connected therewith, and the electric appliance plate is provided with a battery management system assembly module.

4. The lithium battery with built-in counterweight according to claim 1 or 3, characterized in that, The battery box body is internally provided with a module support fixed on the bottom plate of the battery box body, and the battery module is fixed on the module support.

5. The lithium battery with built-in counterweight according to claim 1 or 3, characterized in that, The battery box body is internally provided with an electric appliance plate support on the side wall, and the electric appliance plate is fixed on the electric appliance plate support.

6. The lithium battery with built-in counterweight according to claim 1, wherein, The side wall of the battery box body is provided with a sealing strip, one of the sealing strips is provided with a protruding fixed edge, and the fixed edge is provided with a wire harness hole.

7. The lithium battery with built-in counterweight according to claim 6, characterized in that, The fixed edge is provided with a wire harness assembly, and the wire harness assembly is connected to the internal circuit of the battery box body through the wire harness hole.

8. The lithium battery with built-in counterweight according to claim 1, wherein, The box cover assembly covers the sealing strip of the side wall of the battery box body, and the box cover assembly leaves a corresponding strip-shaped gap outside the fixed edge; the box cover assembly is provided with a wire clamp and a charging seat base, the wire harness of the wire harness assembly is fixed on the wire clamp, and the wire harness is connected with the charging seat arranged on the charging seat base.

9. The lithium battery with built-in counterweight according to claim 1, characterized in that, The side walls of the opposite sides of the battery box body are provided with a connecting plate strip protruding beyond the box cover assembly, and the connecting plate strip is provided with a connecting hole.

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