Battery pack suitable for low-temperature charging

Abstract

The battery pack suitable for low-temperature charging comprises a battery pack, a heating assembly, a controller and a temperature collector, wherein the battery pack comprises a plurality of battery cells; the heating assembly comprises a heat conduction piece arranged between two adjacent battery cells and a heat conduction piece electrically connected to the heating piece; one end of the temperature collector is electrically connected to the controller, and the other end of the temperature collector is in contact with the battery pack and can collect the temperature of the battery pack and transmit related information to the controller; the controller is electrically connected to the heating assembly and the battery pack and performs related control after receiving temperature information detected by the temperature collector: if the temperature of the battery pack is lower than a preset temperature, the controller controls the heating assembly to heat, and meanwhile, the battery pack performs low-current charging until the temperature reaches the preset temperature, and the controller controls the heating assembly to stop working; and the battery pack performs large-current charging. And in a low-temperature environment, the charging environment is heated while the low-current battery is charged, so that the damage to the battery core is greatly reduced, and the service life of the battery core is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to a battery pack suitable for low temperature charging. BACKGROUND

[0002] With the development of science and technology, battery has become mainstream, in cold weather, cold weather can affect the use demand of battery, due to the characteristics of battery, the charging of large current in low temperature environment can damage the service life of battery, want battery can be used normally in low temperature environment, need to heat the battery before charging, guarantee the internal temperature of battery higher than 15 DEG C, like this can reduce the damage to battery and guarantee the service life of lithium battery.

[0003] In the prior art, the bottom of the battery pack is pasted with PTC heating or liquid heating to heat the battery pack. However, the operation of pasting the PTC film is relatively complicated, which can affect the efficiency of the workers, the labor cost is high, the liquid heating method requires a relatively high space, and other devices are required to cooperate and the cost is high, in addition, the heating film after pasting the PTC film cannot be reused, the internal interface of the liquid heating should be dropped or impacted to loosen, the liquid outflow can cause pollution and battery damage, which can easily lead to waste of resources and increase of cost. UTILITY MODEL CONTENT

[0004] In view of the deficiencies in the background art, the utility model aims to provide a battery pack suitable for low temperature charging.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A battery pack suitable for low temperature charging, characterized by comprising

[0007] Battery pack, comprising a plurality of battery cells;

[0008] Heating assembly, comprising a plurality of heating elements, and heat conducting elements connected with the heating elements, the heating assembly is arranged between two adjacent battery cells;

[0009] Controller, electrically connected to the heating assembly and the battery pack, for controlling the heating element work; And

[0010] Temperature collector, one end of the temperature collector is electrically connected to the controller, for collecting and transmitting the temperature data of the battery pack to the controller;

[0011] When charging, the controller receives the temperature data transmitted by the temperature collector, if the battery pack is lower than the preset temperature, the controller controls the heating assembly to heat until the temperature is higher than the preset temperature, and the controller controls the heating assembly to stop working; if the battery pack is higher than the preset temperature, the controller controls the heating assembly to not work.

[0012] Further, the heat-conducting member comprises a heat-conducting pad and a heat-conducting plate, the heat-conducting plate is arranged between two adjacent battery cells, and the heat-conducting pad is arranged between the heat-conducting plate and the heating member.

[0013] Further, the battery pack further comprises a first insulating sheet and a second insulating sheet, the first insulating sheet is arranged on two sides of each battery cell, and the second insulating sheet is arranged at the bottom of each battery cell.

[0014] Further, two adjacent battery cells are electrically connected with a connecting sheet, the connecting sheet comprises a positive sheet and a negative sheet, the positive sheet is connected to the positive pole of one battery cell, and the negative sheet is connected to the negative pole of another battery cell.

[0015] Further, at least two first fixing plates and a second fixing plate are further included, two first fixing plates are arranged at two ends of the battery pack respectively, and two ends of the second fixing plate are connected to the two first fixing plates respectively.

[0016] Further, a fixing frame is further included, and the battery pack is arranged on the fixing frame.

[0017] Further, a heating switch is further included, the heating switch is electrically connected to the controller and the heating assembly, and the controller controls the working and closing of the heating assembly by controlling the heating switch.

[0018] Further, a total positive line of battery cells is electrically connected to the positive pole of the battery pack, a total negative line of battery cells is electrically connected to the negative pole of the battery pack, and the other end of the total negative line of battery cells is electrically connected to the controller.

[0019] Further, a control line is electrically connected to the positive pole of the battery pack, the control line is electrically connected to each heating member and the controller, and each heating member is in series.

[0020] The utility model discloses the beneficial effect is:

[0021] 1. The utility model proposes a kind of battery pack suitable for low temperature charging, including battery pack, heating assembly, temperature collector and controller of electric connection.The temperature collector can detect the temperature of battery pack, and temperature information is passed to controller, and the detection information of temperature collector is accepted, the work of heating assembly is controlled when being lower than preset temperature, ensure that battery pack can supply power heating when low temperature charging;The structure between each component is simple and reliable, production efficiency is high, it is favorable to reduce battery pack cost.

[0022] 2, the utility model proposes a kind of battery pack suitable for low temperature charging, heating assembly includes heating piece and heat conducting piece.Heating piece is used as heat source, and heating when working.And heat conducting piece is attached with heating piece, can conduct the heat generated by heating piece to the inside of battery pack and increase area, to heat each battery cell more evenly.

[0023] 3, the utility model proposes a kind of battery pack suitable for low temperature charging, heat conducting piece includes heat conducting plate and heat conducting pad, wherein heat conducting plate is located between two adjacent battery cells, heat conducting pad is located between heat conducting plate and heating piece, can better let heating piece and heat conducting piece combine, avoid the gap between the two to cause heat conduction performance to decline.

[0024] 4, the utility model proposes a kind of battery pack suitable for low temperature charging, battery pack further includes first fixed plate and second fixed plate.First fixed plate is located at the two ends of battery pack, and is connected by second fixed plate, and each battery cell in battery pack is fixed by the cooperation of first fixed plate and second fixed plate.

[0025] 5, the utility model proposes a kind of battery pack suitable for low temperature charging, first insulating sheet and second insulating sheet are pasted on the two sides and bottom of battery cell respectively, prevent battery cell and heating assembly these parts from forming direct contact, prevent the damage of insulating layer of battery cell when impacting and falling, cause short circuit.

[0026] 6, the utility model proposes a kind of battery pack suitable for low temperature charging, further include fixed frame.Fixed frame is connected to the bottom of battery pack, provides stable support for entire battery pack, prevent displacement or shaking in the carrying process of battery pack, to avoid the damage and short circuit risk of battery pack. SHEET

[0027] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0028] Figure 1 This is a wiring diagram of a battery pack suitable for low-temperature charging according to the present invention;

[0029] Figure 2 This is a bottom view of a battery pack suitable for low-temperature charging according to the present invention;

[0030] Figure 3 This is a schematic diagram of a battery pack suitable for low-temperature charging according to the present invention;

[0031] Figure 4 This is an exploded view of a battery pack suitable for low-temperature charging according to the present invention.

[0032] Figure 5 This is a front view of a battery pack suitable for low-temperature charging according to the present invention;

[0033] Figure 6 This is a top view of a battery pack suitable for low-temperature charging according to the present invention;

[0034] Figure 7 This is a schematic diagram of the heating component of this utility model;

[0035] In the diagram, 10 is the battery pack; 101 is the battery cell; 102 is the first fixing plate; 103 is the second fixing plate; 203 is the thermally conductive silicone pad; 104 is the insulating sheet; 105 is the connecting piece; 20 is the heating assembly; 201 is the T-shaped aluminum sheet; 202 is the aluminum shell resistor; 30 is the controller; 40 is the mounting bracket; 501 is the controller's main negative wire; 502 is the battery cell's main negative wire; 503 is the battery cell's main positive wire; 504 is the voltage acquisition harness; 505 is the aluminum shell resistor connection wire; and 506 is the aluminum shell resistor heating control wire. Detailed Implementation

[0036] The following is combined with Figures 1-7 This utility model will be described in detail.

[0037] This embodiment provides a battery pack suitable for low-temperature charging, such as... Figure 3 As shown, it includes a battery pack 10, a heating assembly 20, a temperature sensor, and a controller 30. Specifically, as... Figure 4As shown, the battery pack 10 includes a plurality of battery cells 101, each of which is arranged in sequence; the heating assembly 20 includes a heat-conducting member and a heating member, the heat-conducting member is arranged between two adjacent battery cells 101, and the heat-conducting member is connected with the heating member, so as to transmit the heat generated by the heating member to the two adjacent battery cells 101; the controller 30 is electrically connected with the heating assembly 20, and can control the operation of the heating assembly 20. In this embodiment, a temperature collector is further included, one end of the temperature collector is electrically connected with the controller 30, and the temperature probe at the other end is connected with the battery pack 10, so as to detect the temperature of the battery pack 10 and transmit the related temperature data to the controller 30; the controller 30 receives the temperature data detected by the temperature collector, and makes corresponding regulation and control according to the temperature data. Specifically, if the temperature of the battery pack 10 is lower than the predetermined temperature and is in a low-temperature state, the controller 30 controls the heating assembly 20 to heat until the temperature reaches the predetermined temperature, and then the controller 30 controls the heating assembly 20 to stop working; if the temperature of the battery pack 10 before charging is higher than the predetermined temperature, the controller 30 controls the heating assembly 20 to remain not working, and the battery pack 10 directly charges. In practice, the temperature value of the predetermined temperature can be set according to actual needs. In this embodiment, when the predetermined temperature is 0℃, the air temperature below 0℃ belongs to low temperature, and at this time the controller 30 controls the heating assembly 20 to heat. In this embodiment, the controller 30 is also electrically connected with the battery pack 10, and can control the distribution of the current entering the battery pack 10 and the heating assembly 20 during charging.

[0038] As shown in Figure 5 and Figure 6 , the battery pack 10 further includes at least two first fixing plates 102 and second fixing plates 103; the two first fixing plates 102 are respectively arranged at two ends of the battery pack 10, and the two ends of the second fixing plate 103 are respectively connected with the first fixing plates 102. In this embodiment, the battery pack 10 includes two first fixing plates 102 and four second fixing plates 103, the two first fixing plates 102 are respectively located at opposite two ends of the battery pack 10 and are respectively attached to the end face of one battery cell 101; the two ends of each second fixing plate 103 are respectively connected with the first fixing plates 102, and form a rectangle connected in head and tail, and each battery cell 101 is fixedly pressed between the second fixing plate 103 and the first fixing plate 102. Specifically, the two second fixing plates 103 are symmetrically distributed.

[0039] In this embodiment, a fixing frame 40 is further included. The fixing frame 40 is arranged at the bottom of the battery pack 10 and the heating assembly 20, and is a supporting member of the whole product, which is used to lift the whole battery pack 10 and the heating assembly 20, so as to prevent the battery pack from falling or deforming due to external force during the carrying process.

[0040] As shown in Figure 7As shown, the heat conduction member includes a heat conduction plate, which is arranged between the two battery cells 101, and a heat conduction pad arranged at the bottom of the heat conduction plate and between the heat conduction member and the heating member, so that the combination of the heat conduction member and the heating member is more compact, and gaps between the two are avoided to prevent heat dissipation. In this embodiment, the heat conduction plate is made of aluminum, copper or metal coated with graphene; and the heating member can be a thick film resistor or other heating element. Specifically, the heat conduction pad in this embodiment is a heat conduction silica gel pad 203, the heat conduction plate is a T-shaped aluminum sheet 201, and the heating member is an aluminum shell resistor 202. In operation, current flows through the aluminum shell resistor 202 to generate heat, and the T-shaped aluminum sheet 201 transfers the heat to the battery cells 101 to increase the temperature. In this embodiment, the battery cells 101 are also provided with insulating sheets 104 on both sides and the bottom to prevent the battery cells 101 from being directly in contact with the first fixing plate 102 and the T-shaped aluminum sheet 201 after being bumped, which may cause electric leakage and short circuit. Specifically, the insulating sheet 104 includes a first insulating sheet arranged on both sides of the battery cells 101 and a second insulating sheet arranged on the bottom of the battery cells 101.

[0041] In this embodiment, the battery pack 10 also includes a plurality of connecting sheets 105. The connecting sheets 105 are connected to the pole posts on the adjacent battery cells 101 at both ends. Specifically, the connecting sheets 105 include positive sheets and negative sheets, the positive sheets are connected to the positive pole posts of one of the battery cells 101, and the negative sheets are connected to the negative pole posts of another of the battery cells 101. The connecting sheets 105 can also include only positive sheets or negative sheets and be connected to the pole posts of the battery pack 10 for easy wiring with the outside. In this embodiment, the connecting sheets 105 are welded to the pole posts of the battery cells 101 by a laser welding machine to ensure that the entire battery pack 10 forms a complete structure.

[0042] In this embodiment, the controller 30 is provided with a BMS battery management system, which includes a voltage detection module, a temperature detection module, a control module, a heating module and a charging module electrically connected and matched with each other, can detect the voltage and temperature of each battery cell 101, control the charging and discharging of the battery cells, and heat and charge the battery cells 101 with a small current at low temperature. Specifically, as shown in Figure 1 and Figure 2 As shown, the controller 30 is electrically connected with a controller total negative line 501; the negative pole posts of the battery pack 10 are electrically connected with the controller 30 through cell total negative lines 502, and the positive pole posts of the battery pack 10 are electrically connected with cell total positive lines 503 and control lines, and the control lines are electrically connected with the aluminum shell resistors 202 and the controller 30. The control lines include aluminum shell resistor heating control lines 506 and aluminum shell resistor connecting lines 505 electrically connected with each other; the aluminum shell resistors 202 are electrically connected with each other through the aluminum shell resistor connecting lines 505; and the battery cells 101 are electrically connected with the controller 30 through voltage collection line bundles 504.

[0043] In the embodiment, the predetermined temperature includes a first predetermined temperature and a second predetermined temperature, and the second predetermined temperature is higher than the first predetermined temperature. After the external charger is connected, the temperature collector detects the temperature of the battery pack 10. If the temperature of the battery pack 10 is lower than the first predetermined temperature, the heating assembly 20 works and stops working after heating to the second predetermined temperature. If the temperature of the battery pack 10 detected by the temperature collector is higher than the second predetermined temperature after the external charger is connected, the heating assembly 20 does not work. In the embodiment, the first predetermined temperature is 0 DEG C, and the second predetermined temperature is 15 DEG C. In the case that all the connections are complete, the current flows from the total positive line 503 of the battery cell to the battery pack 10, and then is output to the controller 30 through the total negative line 502 of the battery cell, and finally is output by the total negative line 501 of the controller. Before the battery pack 10 is charged, if the temperature of the battery pack 10 is lower than the first predetermined temperature, the controller 30 controls small current to enter the battery pack 10 and large current to enter the heating assembly 20 to complete heating. Until the temperature of the battery pack 10 reaches the second predetermined temperature, the current no longer flows through the heating assembly 20, but enters the battery pack 10 to complete charging. Specifically, the battery pack provided by the utility model is a lithium battery pack. When working, the temperature collector detects the temperature before the battery pack 10 is charged, and transmits the related temperature data to the controller 30. If the temperature collector detects that the temperature of the battery pack 10 is lower than 0 DEG C, the controller 30 will control the corresponding module to start the low-temperature small-current charging and low-temperature heating functions during charging: open the heating switch to let the large current pass through the aluminum shell resistance 202 to heat, and transmit the heat to the battery cell 101 through the T-shaped aluminum sheet 201; and the small current charges the battery cell 101. The small-current charging will not damage the battery cell 101. When the temperature of the battery pack 10 reaches 15 DEG C, the controller 30 closes the heating switch, the large current does not flow through the aluminum shell resistance 202, and the aluminum shell resistance 202 stops generating heat; all the large current directly charges the battery cell 101, and the heat generated by the battery cell 101 during the large-current charging maintains the temperature of the battery cell 101. If the temperature of the battery pack 10 detected before charging is higher than the first predetermined temperature of 0 DEG C, the battery pack 10 directly charges, and the heating assembly 20 does not work. Specifically, the heating switch for controlling the large current passing through the aluminum shell resistance 202 in the embodiment is a MOS switch.

[0044] The above embodiment is only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent change or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A battery pack suitable for low temperature charging, characterized in that, The battery pack comprises a plurality of battery cells; The heating assembly comprises a plurality of heating elements and a plurality of heat-conducting elements connected to the heating elements, and is arranged between two adjacent battery cells; The controller is electrically connected to the heating assembly and the battery pack, and is configured to control the heating elements to work; The temperature collector is electrically connected to the controller at one end, and is configured to collect and transmit temperature data of the battery pack to the controller; When charging, the controller receives the temperature data transmitted by the temperature collector. If the battery pack is lower than a preset temperature, the controller controls the heating assembly to heat until the temperature is higher than the preset temperature, and then controls the heating assembly to stop working. If the battery pack is higher than the preset temperature, the controller controls the heating assembly to not work. The heat-conducting elements comprise heat-conducting pads and heat-conducting plates. The heat-conducting plates are arranged between two adjacent battery cells, and the heat-conducting pads are arranged between the heat-conducting plates and the heating elements. The battery pack further comprises first insulating sheets and second insulating sheets. The first insulating sheets are arranged on both sides of each battery cell, and the second insulating sheets are arranged at the bottom of each battery cell.

2. A battery pack suitable for low temperature charging as claimed in claim 1, wherein, Two adjacent battery cells are electrically connected to a connecting sheet. The connecting sheet comprises a positive sheet and a negative sheet. The positive sheet is connected to a positive pole of one battery cell, and the negative sheet is connected to a negative pole of another battery cell.

3. A battery pack suitable for low temperature charging as claimed in claim 2, wherein, The battery pack further comprises at least two first fixing plates and a second fixing plate. The two first fixing plates are arranged at two ends of the battery pack, respectively, and the two ends of the second fixing plate are connected to the two first fixing plates, respectively.

4. A battery pack suitable for low temperature charging as claimed in claim 3 wherein, The battery pack is arranged on the fixing frame.

5. A battery pack suitable for low temperature charging as claimed in claim 4 wherein, The battery pack further comprises a heating switch. The heating switch is electrically connected to the controller and the heating assembly. The controller controls the working and closing of the heating assembly by controlling the heating switch.

6. A battery pack suitable for low temperature charging as claimed in claim 5 wherein, A total positive line of the battery pack is electrically connected to the positive poles, and a total negative line of the battery pack is electrically connected to the negative poles. The other end of the total negative line is electrically connected to the controller.

7. A battery pack suitable for low temperature charging as claimed in claim 6 wherein, A control line is electrically connected to each heating element and the controller. The heating elements are connected in series.

8. A battery pack suitable for low temperature charging as claimed in claim 7 wherein, ​ 9. A battery pack suitable for low temperature charging as claimed in claim 8 wherein, ​

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