CN218548719U - Battery cover plate, high-capacity battery and high-capacity battery pack - Google Patents

Abstract

The utility model provides a battery cover plate, large capacity battery and large capacity group battery mainly solves the problem that current battery series connection structure is not applicable to the upper and lower apron is just, the large capacity battery of negative plate. The battery cover plate is a positive plate or a negative plate of a battery and mainly comprises a mounting plate and a conductive plate; the current-conducting plate is arranged on one side end face of the mounting plate, and the mounting plate and the current-conducting plate can conduct electricity; the terminal surface that the mounting panel was kept away from to the current conducting plate is provided with the recess that a plurality of intervals were arranged, and the plane between the adjacent recess is for installing the face, is provided with a N electrically conductive arch on this installation face. When adjacent large capacity batteries are connected in series, the conductive protrusion extrudes the line and surface contact of the adjacent battery cover plate into surface and surface contact through plastic deformation, and the plastic surface and the surface contact realize effective contact of two polar plates, so that the contact resistance between the two polar plates is greatly reduced, and the adjacent battery cover plate is electrically connected well.

Description

Battery cover plate, high-capacity battery and high-capacity battery pack

Technical Field

The utility model belongs to the battery field, concretely relates to battery apron, large capacity battery and large capacity group battery.

Background

The application field of the lithium ion battery is very wide, in recent years, with the further development of the lithium ion battery, a plurality of lithium ion batteries are assembled into a large-capacity battery in parallel, and then the plurality of large-capacity batteries are connected in series to form a large-capacity battery pack which can be applied to the fields of energy storage, power batteries and the like. The safe and reliable series connection of a plurality of large-capacity batteries is the key of the safe operation of a large-capacity battery pack.

Chinese patent CN212725506U discloses a lithium battery pack structure for UPS energy storage module, and this structure includes a plurality of electricity core and fixed band, adopts double faced adhesive tape to bond between the adjacent electricity core, and electricity core concatenation links together, and the fixed band cup joints the outside of the electricity core subassembly that the concatenation is in the same place. The lithium battery pack structure further comprises a high-voltage connecting piece and a low-voltage connecting piece, the high-voltage connecting piece is connected with the battery cell polar plate of each battery cell, and the low-voltage connecting piece is connected with the high-voltage connecting piece. The high-voltage connecting piece is the output copper bar, and the output copper bar links together the electric core polar plate of adjacent electric core according to the series connection requirement, and the low pressure connecting piece is the pencil, and the pencil links together each output copper bar, and this lithium cell group structure realizes the electricity through high-voltage connecting piece and low pressure connecting piece and connects.

Chinese patent CN215418389U discloses a lithium battery pack structure, which includes a plurality of lithium battery packs and a containing box; the lithium battery packs are electrically connected and arranged in the accommodating box; the lithium battery pack comprises a plurality of square lithium batteries and connecting pieces; the square lithium batteries are attached to each other and are electrically connected in series through the connecting piece, and the connecting piece is provided with a buffer structure.

The series connection of a plurality of batteries is realized in the lithium battery pack, but the series connection of battery poles is realized through connecting pieces, the series connection structure is not suitable for battery pole plates, and meanwhile, the contact resistance between the batteries in the connection mode is large, and good electric contact cannot be realized.

Disclosure of Invention

For solving current battery series structure unsuitable upper and lower apron be just, the large capacity battery of negative plate, the great problem of contact resistance simultaneously, the utility model provides a battery cover plate, large capacity battery and large capacity group battery.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a battery cover plate is a positive plate or a negative plate of a battery and comprises a mounting plate and a conductive plate; the current-conducting plate is arranged on one side end face of the mounting plate, and the mounting plate and the current-conducting plate can conduct electricity; the length direction of the conducting plate is the X direction, the width direction is the Y direction, and the height direction is the Z direction; the terminal surface of the current-conducting plate far away from the mounting plate is provided with a plurality of grooves arranged at intervals, the plane between the adjacent grooves is a mounting surface, at least one mounting surface is provided with N current-conducting protrusions, and N is an integer greater than or equal to 1.

Furthermore, the plurality of grooves extend in the X direction and are arranged in the Y direction, the N conductive protrusions extend in the X direction and are arranged in the Y direction on the mounting surface, the maximum cross-sectional dimension of the conductive protrusions in the Y direction is 0.1-0.2 times of the dimension of the mounting surface in the Y direction, and the maximum dimension of the conductive protrusions in the Z direction is 0.8-1.2 times of the maximum dimension of the conductive protrusions in the Y direction.

Furthermore, the plurality of grooves extend in the X direction and are arranged in the Y direction, the N conductive protrusions extend in the Y direction and are arranged in the X direction on the mounting surface, the maximum cross-sectional dimension of the conductive protrusions in the X direction is 0.1-0.2 times of the dimension of the mounting surface in the Y direction, and the maximum dimension of the conductive protrusions in the Z direction is 0.8-1.2 times of the maximum dimension of the conductive protrusions in the X direction.

Further, the size of the conductive protrusion close to one end of the conductive plate is larger than that of the conductive protrusion far away from one end of the conductive plate.

Further, the end part of the conductive protrusion, which is far away from the conductive plate, is of an arc surface structure, or the conductive protrusion is of a trapezoidal table structure, so that plastic deformation caused by extrusion can be better realized.

Furthermore, each mounting surface is provided with two side-by-side conductive protrusions, and the distance between the two conductive protrusions is larger than the width of each conductive protrusion.

Further, the installation surfaces provided with the conductive protrusions and the installation surfaces not provided with the conductive protrusions are alternately arranged.

Further, the size of the conducting plate on the XY plane is smaller than that of the mounting plate on the XY plane, the mounting plate is provided with a mounting hole, and the groove on the conducting plate is an arc-shaped groove.

Furthermore, the side wall of the current-conducting plate is provided with a mounting protrusion for mounting the pole plate protective sleeve.

And simultaneously, the utility model also provides a large capacity battery, including battery box, battery electricity core and foretell battery apron, the battery apron is two, is large capacity battery's positive plate and negative plate respectively, positive plate and negative plate setting form the closed cavity at the opening end of battery box both sides, and a plurality of battery electricity cores are parallelly connected to be set up in the closed cavity.

Furthermore, the utility model provides a large capacity group battery, including a plurality of large capacity batteries, a plurality of large capacity battery stack sets up, and adjacent large capacity battery passes through the electrically conductive arch on positive plate and the negative plate and is extruded and produce plastic deformation to realize establishing ties.

Compared with the prior art, the utility model discloses technical scheme has following advantage:

the utility model discloses the battery apron is the positive plate or the negative plate of battery, this battery apron includes mounting panel and current conducting plate, be provided with the recess that a plurality of intervals were arranged on the current conducting plate, plane between the adjacent recess is the installation face, be provided with electrically conductive arch on the installation face, this electrically conductive arch is when adjacent large capacity battery is established ties, the line and the face contact extrusion of adjacent battery apron are face and face contact through plastic deformation, the effective contact of two polar plates has been realized with face contact to this kind of plasticity face, thereby greatly reduced contact resistance between them, make adjacent battery apron can realize good electrical contact through less contact surface. Meanwhile, the polar plate is the heat accumulation part of the battery, and the polar plate is used as a battery cover plate, so that the heat dissipation of the battery is facilitated. The utility model discloses set up the recess on the battery apron, this recess not only can alleviate the weight of battery apron, can also form heat dissipation channel or insert the heat pipe between adjacent battery apron, further dispels the heat to the battery apron for the battery operation is at the optimum temperature.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a battery cover plate in embodiment 1 of the present invention;

fig. 2 is a side view of a battery cover plate according to embodiment 1 of the present invention;

fig. 3 is a schematic view of the matching of two battery cover plates in embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a battery cover plate according to embodiment 2 of the present invention;

fig. 5 is a side view of a battery cover plate according to embodiment 2 of the present invention;

fig. 6 is a schematic view of the cooperation of two battery cover plates in embodiment 2 of the present invention;

fig. 7 is a schematic structural view of a battery cover plate according to embodiment 3 of the present invention;

fig. 8 is a schematic structural view of a large-capacity battery according to embodiment 4 of the present invention;

fig. 9 is a cross-sectional view of a large capacity battery in embodiment 4 of the present invention;

fig. 10 is a schematic structural view of a large-capacity battery pack according to embodiment 5 of the present invention.

Reference numerals: 1-battery cover plate, 2-battery box body, 3-battery cell, 11-mounting plate, 12-conducting plate, 13-groove, 14-mounting surface, 15-conducting projection, 16-mounting projection and 17-mounting hole.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

The utility model provides a battery cover plate, this battery cover plate enclose with the battery box and close and form battery case, set up a plurality of battery electricity cores and annex in this battery case, and a plurality of battery electricity cores are parallelly connected and are formed the large capacity battery, and when adjacent large capacity battery established ties, the battery cover plate of a large capacity battery and another large capacity battery's battery cover plate contact to realize establishing ties. The utility model takes the battery cover plate as the positive plate and the negative plate of the large-capacity battery, thereby greatly reducing the material cost of the battery, saving the internal space of the battery and improving the energy density of the battery; meanwhile, the polar plate is the heat accumulation part of the battery, and the polar plate is used as a battery cover plate, so that the heat dissipation of the polar plate of the battery is facilitated. In addition, the serial connection is realized through the contact of the polar plates, so that the connection effectiveness of the battery is improved, the heat generation is reduced, the safety of the battery is improved, and the service life of the battery is prolonged.

It can be known from the above description, the polar plate of large capacity battery is the important component of battery, when two large capacity batteries assemble, adjacent battery apron mainly plays the effect of electric conductance switch-on, positive plate and negative plate contact relatively, carry out the electric conductance switch-on through the contact surface, however to the large capacity battery that the battery apron is positive negative polar plate, the area of positive plate and negative plate is great, if two battery apron contact through whole polar plate face, may contact not well, the problem of the insufficient contact of polar plate appears easily, still can produce the great problem of polar plate contact resistance simultaneously, lead to the electric connection reliability of large capacity battery lower on the contrary, can't guarantee the stability that the polar plate electricity is connected.

Research and experiments show that when adjacent large-capacity batteries are connected in series through the battery cover plate, the batteries can be reliably connected in series through small surface contact. For example, for a current of 3000A, the true, exact contact area is greater than 1500MM ² And the conductive surface is qualified. At this time, the contact length of the battery cover plate is 800MM, that is, it is sufficient that the exact contact surface exceeds 2 MM. The exact contact area required is actually small, and if the positive and negative plates are in full face contact, the effective area of the battery cover plate is about 2.5x10 ⁵ MM ² Therefore, the required real effective contact area is only 6 per mill of the projected area of the polar plate. Based on this, the theoretical contact of upper and lower polar plate is designed as the contact of "line and face", through the extrusion of locking, let the theoretical "line contact with face" become the exact "face contact with face", this kind of plasticity face contacts with face and has realized the effective contact of two polar plates to greatly reduced both contact resistance, realized two good electricity connections of battery.

The utility model discloses the design characteristics of polar plate on the contact surface are, "little arch" and "facet" are adjacent and the interval is arranged, and "little arch" is roughly the same with the quantity of "facet". Thus, when two identical plates are contacted in series, the 'small protrusion' of one plate can be in face-to-face contact with the 'small plane' of the other plate. According to the characteristics of softness and good electric conduction of the aluminum material, the theoretical contact of the upper and lower polar plates is designed to be 'line-to-surface' contact, when the upper and lower polar plates are in contact due to locking, the local rigidity of the 'small bulge' on the contact pair of one small unit is poor, and the rigidity of the corresponding 'small plane' is good. Under the effect of locking force, in the range of contact pair, because aluminium is softer, and the rigidity of "little arch" is relatively poor, so the extruded surface of "little arch" can local unstability and produce plastic deformation (neglecting the weak plastic deformation of "facet"), make original theoretical line contact become "plastic deformation face contact", and on the microstructure of contact surface, bipolar plate has mutual unsmooth embedding, this contact that just makes upper and lower polar plate become "true, exact", can realize the effective contact of two polar plates through this kind of mode, thereby greatly reduced contact resistance between them, make adjacent battery apron realize good electric contact.

Based on the theory, the utility model provides a battery cover plate, which is a positive plate or a negative plate of a battery, or a positive pole or a negative pole of the battery, and comprises a mounting plate and a current conducting plate; the current-conducting plate is arranged on one side end face of the mounting plate, and the mounting plate and the current-conducting plate can conduct electricity; the length direction of the conductive plate is the X direction, the width direction is the Y direction, and the height direction is the Z direction; the terminal surface that the mounting panel was kept away from to the current conducting plate is provided with the recess that a plurality of intervals were arranged, and the plane between the adjacent recess is the installation face, is provided with a N electrically conductive arch on at least one installation face, and N is more than or equal to 1's integer. In order to realize better plastic deformation when the adjacent battery cover plates are electrically connected, the size of the conductive protrusion is smaller relative to the mounting surface, at the moment, the plurality of grooves extend along the X direction and are arranged along the Y direction, the N conductive protrusions can also extend along the X direction and are arranged along the Y direction on the mounting surface, the maximum cross-sectional size of the conductive protrusion in the Y direction is 0.1-0.2 times of the size of the mounting surface in the Y direction, and the maximum size of the conductive protrusion in the Z direction is 0.8-1.2 times of the maximum size of the conductive protrusion in the Y direction. Or the N conductive protrusions extend along the Y direction and are arranged in the X direction on the mounting surface, at the moment, the maximum cross-sectional dimension of the conductive protrusions in the X direction is 0.1-0.2 times of the dimension of the mounting surface in the Y direction, and the maximum dimension of the conductive protrusions in the Z direction is 0.8-1.2 times of the maximum dimension of the conductive protrusions in the X direction. The size is limited, so that the conductive protrusion can realize plastic deformation well, the contact resistance of the conductive protrusion and the battery cover plate is greatly reduced, and the adjacent battery cover plates realize good electric contact.

In order to further achieve the plastic deformation, the conductive protrusion has a larger size at an end thereof closer to the conductive plate than at an end thereof farther from the conductive plate. At the moment, the end part of the conductive protrusion, far away from the conductive plate, is of an arc-shaped structure, so that plastic deformation is generated by better extrusion, or the conductive protrusion is of a trapezoid table structure, and the plastic deformation can be better realized by the structural form.

The conductive protrusions can be arranged on one of the battery cover plates which are connected in series, or can be arranged on two battery cover plates which are connected in series, when the conductive protrusions are arranged on one battery cover plate, the conductive protrusions can be omitted on the other battery cover plate, or the conductive protrusions can be arranged on the two battery cover plates, and at the moment, the mounting surfaces provided with the conductive protrusions and the mounting surfaces not provided with the conductive protrusions can be alternately arranged.

Furthermore, the utility model discloses set up the recess on the battery apron, this recess not only can alleviate the weight of battery apron, can also form the heat dissipation passageway between adjacent battery apron, further dispels the heat to the battery apron for the operation of battery is at the optimum temperature.

Example 1

As shown in fig. 1 to 3, the battery cover plate 1 provided in this embodiment is a positive plate or a negative plate of a battery, or a positive post or a negative post of a battery, the battery cover plate 1 specifically includes an installation plate 11 and a conductive plate 12, the conductive plate 12 is disposed on one side end surface of the installation plate 11, and both the installation plate 11 and the conductive plate 12 can conduct electricity; the length direction of the conductive plate 12 is the X direction, the width direction is the Y direction, and the height direction is the Z direction; the terminal surface that mounting panel 11 was kept away from to conducting plate 12 is provided with a plurality of recesses 13 that the interval was arranged, a plurality of recesses 13 are along X to extending, Y is to arranging, the plane between the adjacent recess 13 is installation face 14, be provided with 2 electrically conductive archs 15 on the installation face 14 that the interval set up respectively, be provided with a plurality of installation faces 14 on the battery apron 1 promptly, be provided with electrically conductive arch 15 on the ith installation face 14, ith +1 installation face 14 does not set up electrically conductive arch 15, be provided with electrically conductive arch 15 on the ith +2 installation face 14, ith +3 installation face 14 does not set up electrically conductive arch 15, set up in turn like this.

In this embodiment, the plurality of conductive bumps 15 extend in the X direction and are arranged in the Y direction on the mounting surface 14, the maximum cross-sectional dimension of the conductive bumps 15 in the Y direction is 0.1 to 0.2 times the dimension of the mounting surface 14 in the Y direction, and the maximum dimension of the conductive bumps in the Z direction is 0.8 to 1.2 times the maximum dimension of the conductive bumps in the Y direction. The above-mentioned structure form in which the dimension of the conductive projection 15 near the end of the conductive plate 12 is larger than the dimension of the conductive projection far from the end of the conductive plate 12 can preferably realize plastic deformation. For example, the end of the conductive protrusion 15 away from the conductive plate 12 has a circular arc structure, so as to better realize plastic deformation caused by extrusion.

Preferably, there are two conductive bumps 15 on the mounting surface 14, and the two conductive bumps 15 are arranged side by side, in which case the distance between the two conductive bumps 15 in the Y direction is greater than the maximum cross-sectional dimension of the conductive bump 15 in the Y direction, and the arrangement is such that there is sufficient space for plastic deformation so that the "line-to-plane" contact can be quickly changed to "plane-to-plane" contact. Meanwhile, the two conductive bumps 15 are provided, which has an advantage that when a single conductive bump 15 fails, another conductive bump 15 can achieve good electrical contact, and meanwhile, if more than three conductive bumps 15 are provided, plastic deformation of the conductive bumps 15 is not easy to achieve, and plastic deformation can be achieved only by a large pressing force. Therefore, the two conductive bumps 15 can easily realize plastic deformation and ensure overcurrent reliability.

Example 2

As shown in fig. 4 to 6, the battery cover plate 1 provided in the present embodiment is a positive plate or a negative plate of a battery, and the battery cover plate 1 includes a mounting plate 11 and a conductive plate 12; the conductive plate 12 is arranged on one side end face of the mounting plate 11, and both the mounting plate 11 and the conductive plate 12 can conduct electricity; the length direction of the conductive plate 12 is the X direction, the width direction is the Y direction, and the height direction is the Z direction; the end face, far away from the mounting plate 11, of the conductive plate 12 is provided with a plurality of grooves 13 which are arranged at intervals, the grooves 13 extend along the X direction and are arranged along the Y direction, a plane between every two adjacent grooves 13 is a mounting face 14, and all the mounting faces 14 are provided with 2 conductive protrusions 15.

In this embodiment, the maximum cross-sectional dimension of the conductive bump in the Y direction is 0.1 to 0.2 times the dimension of the mounting surface in the Y direction, and the maximum dimension of the conductive bump in the Z direction is 0.8 to 1.2 times the maximum dimension of the conductive bump in the Y direction. The above-mentioned structure form in which the dimension of the conductive projection 15 near the end of the conductive plate 12 is larger than the dimension of the conductive projection far from the end of the conductive plate 12 can preferably realize plastic deformation. For example, the conductive bump 15 has a trapezoidal mesa structure, which can better realize plastic deformation by extrusion. In addition, the XY plane of the conductive plate 12 is smaller than the XY plane of the mounting plate 11, the mounting plate 11 is provided with a mounting hole 17, and the groove 13 of the conductive plate 12 is an arc groove and can be used for mounting a heat pipe. In addition, the sidewall of the conductive plate 12 can be provided with an installation protrusion 16 for installing a pole plate protection sleeve, when in installation, the pole plate protection sleeve is clamped on the installation protrusion 16 to protect the battery cover plate 1, so as to prevent the structure of the battery cover plate 1 from being damaged in the installation and transportation process, and the pole plate protection sleeve can be a plastic sleeve or a rubber sleeve, and can also be a plastic bag or a rubber belt.

The utility model discloses set up recess 13 on battery apron 1, this recess 13 not only can alleviate the weight of battery apron 1, can also form heat dissipation channel between adjacent battery apron 1, further dispels the heat to battery apron 1 for the operation of battery is at optimum temperature.

Example 3

As shown in fig. 7, the battery cover plate 1 provided in the present embodiment is a positive plate or a negative plate of a battery, and the battery cover plate 1 includes a mounting plate 11 and a conductive plate 12; the conductive plate 12 is arranged on one side end face of the mounting plate 11, and both the mounting plate 11 and the conductive plate 12 can conduct electricity; the length direction of the conductive plate 12 is the X direction, the width direction is the Y direction, and the height direction is the Z direction; the end face, far away from the mounting plate 11, of the conductive plate 12 is provided with a plurality of grooves 13 which are arranged at intervals, the grooves 13 extend along the Y direction and are arranged along the X direction, a plane between every two adjacent grooves 13 is a mounting face 14, and a plurality of conductive protrusions 15 are arranged on all the mounting faces 14.

In this embodiment, the plurality of conductive bumps 15 extend in the Y direction and are arranged in the X direction on the mounting surface 14, the maximum cross-sectional dimension of the conductive bumps 15 in the X direction is 0.1 to 0.2 times the dimension of the mounting surface 14 in the Y direction, and the maximum dimension of the conductive bumps in the Z direction is 0.8 to 1.2 times the maximum dimension of the conductive bumps in the X direction. The above-mentioned structure form in which the dimension of the conductive projection 15 near the end of the conductive plate 12 is larger than the dimension of the conductive projection far from the end of the conductive plate 12 can preferably realize plastic deformation. The size of the conducting plate 12 in the XY plane is smaller than that of the mounting plate 11 in the XY plane, and the groove 13 on the conducting plate 12 is an arc-shaped groove 13 used for mounting a heat pipe or serving as a heat dissipation channel. The battery cover plate 1 is further subjected to heat dissipation so that the battery operates at an optimum temperature. In addition, a mounting protrusion 16 may be provided on the sidewall of the conductive plate 12 for mounting the plate protective sleeve.

Example 4

As shown in fig. 8 and 9, the present embodiment provides a large-capacity battery, which includes a battery case 2, two battery cells 3, and a battery cover plate 1 in embodiment 1, embodiment 2, or embodiment 3, where the two battery cover plates 1 are positive plates and negative plates, the positive plates and the negative plates are disposed at open ends of two sides of the battery case 2 to form a closed cavity, the closed cavity is used to mount and place the multiple battery cells 3 and their accessories, and the multiple battery cells 3 are connected in parallel to form the large-capacity battery, so as to meet the use requirements in different fields. The positive tab of the battery cells 3 is electrically connected with the battery cover plate 1 through the conductive bar or the conductive sheet, the negative tab of the battery cells 3 is electrically connected with the battery cover plate 1 through the conductive bar or the conductive sheet, the current of the battery cells 3 is led out through the tab, and is transmitted to the battery cover plate 1 through the conductive bar or the conductive sheet, and finally is led out through the battery cover plate 1.

The large-capacity battery in the embodiment is a large battery with upper and lower polar plates in surface-to-surface contact, and the theoretical contact of the upper and lower polar plates is designed to be surface contact with a small area according to the soft characteristic of aluminum. Under the effect of screw locking force, the battery cover plate 1 in up-and-down contact is soft in aluminum, the microscopic (10-6M, micron-sized) unevenness of line contact between the two polar plates can be extruded and destabilized, the original raised high points can be rolled by pressure, the theoretical line contact can be changed into small surface contact, and the two small surface contacts can be embedded into each other in a microscopic mode, so that good overcurrent capacity can be realized through small surface contact. The plastic surface-to-surface contact realizes effective contact of the two polar plates, thereby greatly reducing the contact resistance of the two polar plates and realizing good electric contact of the adjacent battery cover plates through a small contact surface.

Example 5

As shown in fig. 10, the present embodiment provides a large-capacity battery pack including the above-described plurality of large-capacity batteries stacked, and conductive protrusions 15 on the positive and negative electrode plates between the adjacent large-capacity batteries are pressed to be plastically deformed, thereby achieving electrical connection.

When adjacent large capacity battery passes through battery apron 1 and realizes establishing ties, the accessible sets up electrically conductive protruding 15 on one battery apron 1 or sets up electrically conductive protruding 15 simultaneously on two battery apron 1, when setting up electrically conductive protruding 15 on one battery apron 1, only sets up the installation face on another battery apron 1, and the electrically conductive protruding 15 of one battery apron 1 and the installation face of another battery apron 1 realize plastic deformation through the extrusion. When the two battery cover plates 1 are respectively provided with the conductive protrusions 15, the conductive protrusions 15 of the two battery cover plates 1 are arranged in a staggered mode, and the conductive protrusion 15 of one battery cover plate 1 and the mounting surface of the other battery cover plate 1 realize plastic deformation through extrusion.

The battery cover plate 1 in this embodiment is provided with a conductive bump 15, and the conductive bump 15 realizes series connection between adjacent large-capacity batteries. The battery cover plate 1 is electrically connected through the conductive protrusions 15, so that the overall rigidity is high, the local rigidity is poor, and plastic deformation can be easily realized. The theoretical contact of the upper and lower polar plates is designed to be line-to-surface contact, the theoretical line-to-surface contact is changed into exact surface-to-surface contact through the locking extrusion, and the design characteristics of the polar plates on the contact surfaces are that the small bulges and the small planes are arranged adjacently and at intervals, and the quantity of the small bulges is the same as that of the small planes. Thus, when two identical polar plates are contacted, the small bulge of one polar plate is in face-to-face contact with the small plane of the other polar plate, so that the adjacent battery cover plates can realize good electric contact through a small contact surface. The series connection mode omits a complicated and unreliable electric connection piece between the batteries, so that the electric connection between large capacities is reliable. The plastic surface-to-surface contact realizes effective contact of the two polar plates, thereby greatly reducing the contact resistance of the two polar plates and realizing good electric connection of the two batteries.

Claims (10)

1. A battery cover plate is characterized in that the battery cover plate is a positive plate or a negative plate of a battery, and comprises a mounting plate and a conductive plate;

the current-conducting plate is arranged on one side end face of the mounting plate, and the mounting plate and the current-conducting plate can conduct electricity;

the length direction of the conducting plate is the X direction, the width direction is the Y direction, and the height direction is the Z direction;

the terminal surface of the current-conducting plate far away from the mounting plate is provided with a plurality of grooves arranged at intervals, the plane between the adjacent grooves is a mounting surface, at least one mounting surface is provided with N current-conducting protrusions, and N is an integer greater than or equal to 1.

2. The battery cover plate according to claim 1, wherein the plurality of grooves extend in an X direction and are arranged in a Y direction, the N conductive protrusions extend in the X direction and are arranged in the Y direction on the mounting surface, a maximum cross-sectional dimension of the conductive protrusions in the Y direction is 0.1-0.2 times a dimension of the mounting surface in the Y direction, and a maximum dimension of the conductive protrusions in the Z direction is 0.8-1.2 times a maximum dimension of the conductive protrusions in the Y direction.

3. The battery cover plate according to claim 1, wherein the plurality of grooves extend in the X direction and are arranged in the Y direction, the N conductive protrusions extend in the Y direction and are arranged in the X direction on the mounting surface, a maximum cross-sectional dimension of the conductive protrusions in the X direction is 0.1 to 0.2 times a dimension of the mounting surface in the Y direction, and a maximum dimension of the conductive protrusions in the Z direction is 0.8 to 1.2 times a maximum dimension of the conductive protrusions in the X direction.

4. The battery cover plate according to claim 1, wherein the size of the conductive protrusion near the conductive plate is larger than that of the conductive protrusion far from the conductive plate, and the end of the conductive protrusion far from the conductive plate is in a circular arc structure, or the conductive protrusion is in a trapezoidal structure, so as to better realize plastic deformation caused by extrusion.

5. The battery cover plate according to any one of claims 1 to 4, wherein two conductive protrusions are provided side by side on each mounting surface, and a distance between the two conductive protrusions is larger than a width of the conductive protrusion.

6. The battery cover plate according to any one of claims 1 to 4, wherein the mounting surfaces provided with the conductive protrusions and the mounting surfaces not provided with the conductive protrusions are arranged alternately.

7. The battery cover plate according to any one of claims 1 to 4, wherein the conductive plate has a size in the XY plane smaller than that of the mounting plate, and the mounting plate is provided with mounting holes.

8. The battery cover plate according to any one of claims 1 to 4, wherein the groove on the conductive plate is an arc-shaped groove, and the side wall of the conductive plate is provided with a mounting protrusion for mounting the pole plate protective sleeve.

9. A large-capacity battery is characterized by comprising a battery box body, battery cells and the battery cover plate of any one of claims 1 to 8, wherein the number of the battery cover plates is two, namely a positive plate and a negative plate of the large-capacity battery, the positive plate and the negative plate are arranged at the open ends of two sides of the battery box body to form a closed cavity, and the battery cells are arranged in parallel in the closed cavity.

10. A large-capacity battery pack comprising a plurality of large-capacity batteries according to claim 9, wherein the plurality of large-capacity batteries are stacked, and adjacent large-capacity batteries are pressed by the conductive protrusions of the positive electrode plate and the negative electrode plate to be plastically deformed, thereby achieving series connection.

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