Rechargeable battery module equalization instrument discharge load resistor disc

Abstract

The utility model discloses a rechargeable battery module equalizer discharge load resistor disc, which belongs to the technical field of battery discharge protection, and comprises a resistor disc body, a heat conducting strip and a resistor strip, two opposite sides of the resistor disc body are respectively provided with a first connecting end and a second connecting end, and the resistor strip extends from the first connecting end to the second connecting end; the first connecting end is composed of at least two connecting pins, the connecting pins are not in contact with each other, and a resistor strip is arranged between each connecting pin and the second connecting end; the number of the heat-conducting fins is two, the two heat-conducting fins are respectively arranged on the upper surface and the lower surface of the resistor disc body, and the two heat-conducting fins respectively abut against the upper surface and the lower surface of the resistor disc body; the utility model has two modes which enable the equalizer to realize different voltage equalization speeds, so that the working mode of the equalizer can be flexibly adjusted according to the voltage difference between the batteries.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery discharge protection technical field, concretely relates to a kind of discharge load resistance sheet of rechargeable battery module equalizer. BACKGROUND

[0002] The equalizer of rechargeable battery module such as lithium battery usually adjusts the load of battery by built-in discharge resistance, built-in resistance can limit the size of current and help to realize the equalization of battery discharge, built-in can also prevent battery from being damaged due to excessive current by limiting the size of current during battery discharge;Currently, the built-in resistance in battery equalizer usually encapsulates resistance wire and other materials inside, although these built-in resistances have good insulation performance and high power dissipation capacity, but these built-in resistances usually have large volume and occupy more space inside battery equalizer, which is not conducive to the miniaturization or compact design of battery equalizer, and the built-in resistance generates a lot of heat during working process, and improper heat dissipation design of battery equalizer can easily cause internal electronic components to be disturbed by heat.

[0003] Based on the above situation, the Chinese patent with publication number CN204215831U discloses a kind of equalization resistance for lithium battery protector, adopts TO220 packaging technology, including a substrate same as TO220 packaged resistance, a curved alloy resistance wire is covered on the substrate, alloy resistance wire is respectively led out a side pin on the left and right sides of the lower end of substrate, the two ends of alloy resistance wire are respectively connected with two side pins, heat-conducting silicone is covered on the substrate, heat-conducting silicone encapsulates alloy resistance wire on the substrate, alloy resistance wire is in wave shape on the substrate, alloy resistance wire transmits the heat generated to the heat-conducting aluminum plate of lithium battery protection switch through heat-conducting silicone.

[0004] The above patent document discloses a kind of equalization resistance for lithium battery protector based on TO220 packaging, the equalization resistance has similar technical effects with built-in resistance inside battery equalizer, the equalization resistance adopts curved manganese-copper alloy resistance wire, especially in wave shape, the resistance wire with this structure can maximize the resistance value and increase resistance power in relatively small area, but the equalization resistance adopts TO220 packaging technology, which leads to its large thickness, plus a lot of heat is released during the working process of equalization resistance, and a certain heat dissipation space needs to be reserved or special heat dissipation structure for equalization resistance needs to be set, which leads to that equalization resistance needs to occupy larger space, thereby affecting the miniaturization or compact design of battery management system such as battery protector, battery equalizer, so the equalization resistance still has room for improvement. UTILITY MODEL CONTENTS

[0005] The utility model proposes a kind of discharge load resistance sheet of equalizer of rechargeable battery module, solve the above technical problem and meet actual demand, specific technical scheme is as follows:

[0006] A discharge load resistance sheet of equalizer of rechargeable battery module, including resistance sheet body, heat conduction sheet, resistance strip, the resistance sheet body opposite two sides are equipped with first connecting end and second connecting end respectively, the resistance strip extends from first connecting end to second connecting end;

[0007] The first connecting end is composed of at least two connecting pins, the connecting pins are not in contact with each other, and a resistance strip is provided between each connecting pin and the second connecting end.

[0008] The heat conduction sheet is provided with two pieces, and the two pieces of heat conduction sheet are arranged on the upper surface and the lower surface of the resistance sheet body, respectively, and abut against the upper surface and the lower surface of the resistance sheet body.

[0009] As a further technical solution of the utility model, the resistance strip is composed of an inner extension strip and an outer extension strip, the inner extension strip extends along a position close to the center of the heat conduction sheet, and the outer extension strip extends along a position close to the edge of the heat conduction sheet.

[0010] As a further technical solution of the utility model, the resistance strips are not in contact with each other, and the inner extension strips, the outer extension strips, or the inner extension strips and the outer extension strips are not in contact with each other.

[0011] As a further technical solution of the utility model, a first connecting hole is formed through the surface of each connecting pin, and a second connecting hole matching the first connecting hole is formed through the surface of the second connecting end.

[0012] As a further technical solution of the utility model, the resistance strip extends in a curved manner between the first connecting end and the second connecting end.

[0013] The utility model has the following beneficial effects:

[0014] The first connecting end, the second connecting end and the discharge circuit of the battery module are connected, and the internal resistance of the resistance sheet body adjusts the load during the discharge process of the battery module. During the process of adjusting the discharge load of the battery module by the resistance sheet body, there are two battery voltage equalization modes of one resistance strip in series and two resistance strips in parallel. The two modes enable the equalizer to achieve different voltage equalization speeds, so that the equalizer can flexibly adjust the working mode according to the pressure difference between the batteries. Moreover, the utility model has a compact structure and occupies a small space, which is beneficial to the miniaturization or compact design of the equalizer. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a discharge load resistance sheet of a rechargeable battery module equalizer.

[0016] Figure 2 It is a disassembled schematic diagram of a discharge load resistance sheet of a rechargeable battery module equalizer.

[0017] Figure 3 It is a structural schematic diagram of a resistance sheet body of a discharge load resistance sheet of a rechargeable battery module equalizer.

[0018] Figure 4 It is a structural schematic diagram of a first embodiment of a discharge load resistance sheet of a rechargeable battery module equalizer.

[0019] Figure 5 It is a disassembled schematic diagram of a first embodiment of a discharge load resistance sheet of a rechargeable battery module equalizer.

[0020] Wherein: 1-resistance sheet body, 2-heat conduction sheet, 3-resistance strip, 31-inner extension strip, 32-outer extension strip, 4-first connection end, 41-connection pin, 42-first connection hole, 5-second connection end, 51-second connection hole, 6-radiator. DETAILED DESCRIPTION

[0021] The implementation of the present application will be described below in conjunction with the accompanying drawings and related embodiments, and the implementation of the present application is not limited to the following examples, and the present application relates to the necessary components in the related technical field, which should be regarded as the known technology in the technical field, and can be known and mastered by the skilled in the art.

[0022] Referring to Figure 1 , Figure 2 , Figure 3 A discharge load resistance sheet of a rechargeable battery module equalizer, comprising a resistance sheet body 1, a heat conduction sheet 2, and a resistance strip 3, the resistance sheet body 1 is provided with a first connection end 4 and a second connection end 5 on opposite sides, respectively, and the resistance strip 3 extends from the first connection end 4 to the second connection end 5; the first connection end 4 is composed of at least two connection pins 41, and the connection pins 41 do not contact each other, and the resistance strip 3 is arranged between each connection pin 41 and the second connection end 5; the heat conduction sheet 2 is provided with two pieces, and the two pieces of heat conduction sheet 2 are arranged on the upper surface and the lower surface of the resistance sheet body 1, respectively, and the two pieces of heat conduction sheet 2 abut the upper surface and the lower surface of the resistance sheet body 1, respectively.

[0023] The utility model mainly is as the built-in resistance inside the equalizer of rechargeable battery module, the utility model mainly adjusts the load in the discharge process of rechargeable battery module in the equalizer, the resistance sheet body 1 is as the main structure of the utility model, its opposite two sides are equipped with first connecting end 4 and second connecting end 5 respectively, first connecting end 4, second connecting end 5 are electrically connected with the discharge circuit of battery module through electric wire, make the resistance sheet body 1 be as load adjustment structure in the discharge circuit of battery module, resistance strip 3 adopts one of nickel chromium alloy, iron chromium aluminum alloy, copper nickel alloy, manganese copper alloy as raw material, these materials all have high resistivity, good thermal stability and high temperature resistance, can keep stable resistance value under high power dissipation condition, thereby adjust the load in the discharge process of battery module.

[0024] Further, two resistance strips 3 are preferably arranged between the first connecting end 4 and the second connecting end 5, and two connecting pins 41 are preferably arranged on the first connecting end 4. After adopting the structure, the two resistance strips 3 are in parallel connection in the discharge circuit of the battery module. One of the connecting pins 41 can be controlled by an independent circuit switch to close or open the connection between the connecting pin 41 and the discharge circuit of the battery module. When the circuit switch is open, only one resistance strip 3 of the resistance sheet body 1 is powered on, and the resistance sheet body 1 is in a state of high resistance. The resistance sheet body 1 reduces the voltage of the high-voltage battery by dissipating electric energy and generating heat, thereby balancing the voltage of the battery. At this time, the current in the battery voltage balancing process is low, and the battery balancing process is relatively slow. When the circuit switch is closed, the resistance sheet body 1 has two parallel resistance strips 3, the resistance of the resistance sheet body 1 is reduced, and the shunt current and power dissipation are increased. At this time, the balancing speed of the battery voltage can be accelerated and the balancing time can be shortened.

[0025] It should be noted that the above lists two battery voltage balancing modes that can be achieved by the utility model. If three or more resistance strips 3 are arranged in parallel in the resistance sheet body 1, theoretically, three or more battery voltage balancing modes can be achieved by the utility model. The principles of these modes are similar to the mode of two parallel resistance strips 3, and will not be described here. In addition, the control circuit in the equalizer can automatically switch the single resistance or double resistance mode of the resistance sheet body 1 according to the voltage difference between the batteries in the battery module, thereby flexibly adjusting the battery voltage balancing process.

[0026] Further, the heat-conducting sheet 2 can adopt a heat-conducting silica gel sheet or a high-heat-conducting insulating plastic as a raw material, both of which have excellent heat-conducting performance and electrical insulation performance, can effectively conduct the heat generated by the resistance strip 3 during operation to a heat sink or other heat-dissipating element to play a heat-dissipating role, and meanwhile maintain the insulation of the internal circuit of the equalizer.

[0027] As a first preferred embodiment of the utility model, the utility model is arranged between two heat sinks 6 in the equalizer, referring to Figure 4 、 Figure 5 The first connecting end 4 and the second connecting end 5 extend outward from the edge of the heat sink 6 and are used for electrically connecting with the discharge circuit, since the resistance sheet body 1 and the two heat-conducting sheets 2 are both in the form of a sheet, the overall thickness of the utility model is 0.5-2mm, the two heat sinks 6 serve as the heat-dissipating structure of the equalizer, the utility model has a lower influence on the space occupied by the heat-dissipating structure, can further form a hidden built-in resistance in the equalizer, and the heat generated by the resistance sheet body 1 during operation can be dissipated through the heat sink 6, so that a dedicated heat-dissipating structure for the resistance sheet body 1 is not needed, which is beneficial to the miniaturization or compact design of the equalizer.

[0028] As one of the preferred embodiments of the utility model, referring to Figure 2 、 Figure 3 The resistance strip 3 is bent and extended between the first connecting end 4 and the second connecting end 5 to form the resistance sheet body 1, and the bending and extension of the resistance strip 3 between the two heat-conducting sheets 2 can maximize the length of the resistance strip 3 in the limited space, maximize the resistance value of the resistance strip 3, and improve the resistance power.

[0029] As one of the preferred embodiments of the utility model, referring to Figure 2 、 Figure 3 The resistance strip 3 is composed of an inner extension strip 31 and an outer extension strip 32, the inner extension strip 31 extends along a position close to the center of the heat-conducting sheet 2, and the outer extension strip 32 extends along a position close to the edge of the heat-conducting sheet 2; the inner extension strip 31 and the outer extension strip 32 are similar to the resistance strip 3 and are arranged in a bending and extension mode, and a larger gap is easily generated between the bending and extended inner extension strip 31 or outer extension strip 32, the inner extension strip 31 and the outer extension strip 32 are arranged to be complementary to each other in the extension path, which is beneficial to reducing the gap between the two, so as to further maximize the length of the resistance strip 3 in the limited space.

[0030] As one of the preferred embodiments of the utility model, referring to Figure 2 、 Figure 3The adjacent resistance strips 3 are not in contact with each other, and the adjacent inner extension strips 31, the adjacent outer extension strips 32 or the inner extension strips 31 and the outer extension strips 32 are not in contact with each other, so that a plurality of independent resistance structures are formed in the resistance sheet body 1, the space between the two heat-conducting sheets 2 is maximally utilized, and the resistance structures are prevented from being in contact with each other to cause series connection, and the resistance sheet body 1 is prevented from being affected by the series connection to keep a stable resistance value.

[0031] As one of the preferred embodiments of the utility model, referring to Figure 2 、 Figure 3 The surface of each connecting pin 41 is penetrated by a first connecting hole 42, the surface of the second connecting end 5 is penetrated by a second connecting hole 51 matched with the first connecting hole 42, and the resistance sheet body 1 can be fixed in the discharge circuit of the battery module by cooperation of the first connecting hole 42 and the second connecting hole 51 and the fixing bolt, so as to realize electrical connection and make the resistance sheet body 1 more easily installed or disassembled, and improve the convenience in the installation or maintenance process of the equalizer.

[0032] In summary, the first connecting end 4 and the second connecting end 5 are connected with the discharge circuit of the battery module, and the load in the discharge process of the battery module is adjusted by the resistance of the resistance sheet body 1. In the process of adjusting the discharge load of the battery module by the resistance sheet body 1, there are two battery voltage equalization modes of one resistance strip 3 in series and two resistance strips 3 in parallel, and the two modes make the equalizer realize different voltage equalization speeds, so that the equalizer can flexibly adjust the working mode according to the pressure difference between the batteries, and the utility model has compact structure and small space occupation, which is beneficial to the miniaturization or compact design of the equalizer.

[0033] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and decorations can be made without departing from the principle of the utility model, and these improvements and decorations should also be regarded as the protection range of the utility model.

Claims

1. A discharge load resistor for a rechargeable battery module equalizer, comprising a resistor body (1), a heat-conducting sheet (2), and a resistor strip (3), characterized in that, The resistor body (1) has a first connection end (4) and a second connection end (5) on opposite sides, and the resistor strip (3) extends from the first connection end (4) to the second connection end (5). The first connection terminal (4) consists of at least two connection pins (41), which do not contact each other, and each connection pin (41) is provided with a resistor strip (3) between it and the second connection terminal (5). The heat-conducting sheet (2) is provided in two pieces. The two heat-conducting sheets (2) are respectively located on the upper and lower surfaces of the resistor body (1). The two heat-conducting sheets (2) are respectively in contact with the upper and lower surfaces of the resistor body (1).

2. The discharge load resistor sheet of the rechargeable battery module equalizer according to claim 1, characterized in that, The resistor strip (3) is composed of an inner extension strip (31) and an outer extension strip (32). The inner extension strip (31) extends along a position close to the center of the heat-conducting sheet (2), and the outer extension strip (32) extends along a position close to the edge of the heat-conducting sheet (2).

3. The discharge load resistor sheet of the rechargeable battery module equalizer according to claim 2, characterized in that, The adjacent resistor strips (3) do not contact each other, and the adjacent inner extension strips (31), outer extension strips (32), or inner extension strips (31) and outer extension strips (32) do not contact each other.

4. The discharge load resistor sheet of the rechargeable battery module equalizer according to claim 1, characterized in that, Each of the connection pins (41) has a first connection hole (42) through its surface, and the second connection end (5) has a second connection hole (51) through its surface that matches the first connection hole (42).

5. The discharge load resistor sheet of the rechargeable battery module equalizer according to claim 1, characterized in that, The resistor strip (3) extends in a curved manner between the first connecting end (4) and the second connecting end (5).

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